CN111003547B - Negative pressure transmission method and system - Google Patents
Negative pressure transmission method and system Download PDFInfo
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- CN111003547B CN111003547B CN201911295324.1A CN201911295324A CN111003547B CN 111003547 B CN111003547 B CN 111003547B CN 201911295324 A CN201911295324 A CN 201911295324A CN 111003547 B CN111003547 B CN 111003547B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 51
- 238000001179 sorption measurement Methods 0.000 claims abstract description 39
- 230000000694 effects Effects 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 29
- 230000000903 blocking effect Effects 0.000 claims description 23
- 230000005484 gravity Effects 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000001404 mediated effect Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 230000005489 elastic deformation Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006750 UV protection Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000002716 delivery method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
- B65H5/222—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
- B65H29/241—Suction devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/52—Stationary guides or smoothers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/36—Article guides or smoothers, e.g. movable in operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/21—Industrial-size printers, e.g. rotary printing press
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Abstract
The invention relates to the industrial printing technology, and discloses a negative pressure transmission method for transmitting hard and light media from back to front, which comprises the following steps: s1, placing a medium on a negative pressure conveying platform, wherein the negative pressure conveying platform is provided with a negative pressure cavity capable of forming a negative pressure adsorption effect on the medium; s2, giving instantaneous thrust to the medium in the step S1 from two opposite sides to enable the medium to be aligned; s3, conveying the medium after the straightening in the step S2 under negative pressure. A negative pressure conveying system applying the method is also disclosed, and the negative pressure conveying system comprises a negative pressure conveying platform for conveying the medium from back to front and a straightening mechanism for straightening the conveyed medium. The instantaneous thrust force is used for leading the medium to be aligned, and the medium is immediately removed after the action, so that the medium in the conveying process is not blocked, and the medium is not blocked; the instantaneous thrust is applied from two sides of the medium, and the medium is not damaged as long as the acting area and the acting force are proper.
Description
Technical Field
The invention relates to the technical field of industrial printing, in particular to a negative pressure transmission method and a negative pressure transmission system.
Background
The industrial printer is widely applied to printing of printing media with larger sizes such as ceramic tiles, boards, glass, corrugated paper, pinch plates and the like, ink with various colors or effects is printed on the printing media in an ink-jet mode, and then the ink is further processed to obtain an expected pattern, and the ink is corroded in the printing process to permeate into the printing media, so that the pattern obtained by spray painting is not easy to fade, and the printing media have the characteristics of water resistance, ultraviolet resistance, scratch resistance and the like.
Industrial printers are often equipped with negative pressure conveying platforms to realize that printing media are continuously conveyed to a printing area for printing and the printed printing media are continuously conveyed away from the printing area, so that the printing is ensured to be automatic and smooth. For printing media such as ceramic tiles and glass, the printing media cannot be damaged due to collision to a small extent because the printing media have high hardness, so that the printing media can be aligned just by installing a channel which can be just used for the printing media to pass through at one end of the negative pressure conveying platform, and the printing media cannot shift after being aligned due to the large weight of the printing media. However, for light printing media with certain hardness, such as corrugated paper, veneer, and the like, the prior art generally adopts a negative pressure adsorption negative pressure conveying platform to convey because of light weight, even though the hardness is far lower than that of ceramic tiles, glass, and the like, the printing media can be damaged due to small degree of collision, even paper jam and the like can occur to damage machine equipment, so that the conventional alignment method is not feasible for the printing media which need to be conveyed by the negative pressure conveying platform.
Disclosure of Invention
In view of the above, the present invention provides a negative pressure transmission method and system for overcoming at least one of the above-mentioned drawbacks of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a negative pressure transfer method for transferring a hard light medium from the back to the front, comprising the steps of:
s1, placing a medium on a negative pressure conveying platform, wherein the negative pressure conveying platform is provided with a negative pressure cavity capable of forming a negative pressure adsorption effect on the medium;
S2, giving instantaneous thrust to the medium in the step S1 from two opposite sides to enable the medium to be aligned;
s3, conveying the medium after the straightening in the step S2 under negative pressure.
After the medium is placed on the negative pressure conveying platform, instantaneous thrust is given from two sides to enable the medium to be automatically aligned, and after the medium is aligned, the medium is conveyed forwards according to the aligned direction due to the existence of negative pressure adsorption, so that the medium can be accurately printed. The instantaneous thrust force is used for leading the medium to be aligned, and the medium is immediately removed after the action, so that the medium in the conveying process is not blocked, and the medium is not blocked; the instantaneous thrust is applied from two sides of the medium, and the medium is not damaged as long as the acting area and the acting force are proper.
In order to further improve the automation degree, in step S1, stacking the media on a negative pressure conveying platform, where the media stack is a plurality of media stacked in a pile; in the step S2, an instantaneous thrust is given to the medium stack in the step S1 to straighten the medium stack; in step S3, the first medium from bottom to top in step S2 is conveyed under negative pressure, while the second medium from bottom to top and the medium above are given a continuous resistance so as not to be conveyed. After the medium piles are arranged, a continuous resistance is applied to the medium piles except for the bottommost medium to prevent the medium piles from being conveyed forward along with the bottommost medium, so that the aim of conveying the medium piles one by one can be fulfilled, the medium piles can be put on the negative pressure conveying platform one by one, manual work or a mechanical arm is not needed to put the medium piles on the negative pressure conveying platform one by one, and the production efficiency is greatly improved.
The bottom layer of the stacked media can pass through the front layer and the media on the bottom layer can not pass through the bottom layer by giving a continuous resistance to the front layer, so that the aim of separating paper is fulfilled. However, when the bottommost medium is completely extracted from the stacked medium under the negative pressure adsorption effect, the second layer which is originally formed by stacking the medium from bottom to top becomes a new bottommost layer, so that the medium can be continuously conveyed, the upper part of the negative pressure conveying platform is also paved by the medium, the interval between the adjacent mediums is not adjustable, and the printing operation is not facilitated. To this end, in step S3, when the first medium, counted from bottom to top, is transferred to the partially or completely detached medium stack, an upward supporting force is given to the medium stack from below the medium stack so that at least the front portion thereof is detached from the negative pressure transfer stage surface. When the medium to be sent out is far enough, the supporting force is removed to enable the new medium to be absorbed by the negative pressure again and pulled away by the conveyor belt.
Each time the instantaneous pushing force acts to align the medium to be transferred, it is necessary to ensure that the instantaneous pushing force acts on both sides of the medium to align the medium as the lowest layer of the medium to be transferred first, but it is difficult to ensure that the medium is too thin, and therefore, in step S2, an upward supporting force is given to the medium stack from below the medium stack in step S1 to make at least the front part of the medium stack separate from the surface of the negative pressure transfer platform, and then an instantaneous pushing force is given to the medium stack to align the medium stack. In this way, the alignment of the media before delivery is ensured, regardless of the thickness of the media.
In step S3, the medium is conveyed to the working area, then the medium is stopped to be conveyed, the medium is conveyed continuously after the working area operation is finished, and the steps S1-S3 or S2-S3 are repeated to convey the next medium.
The central line of the working area perpendicular to the conveying direction is used as a symmetry axis, so that the negative pressure cavities of the working area are symmetrically distributed and two symmetrical or two groups of negative pressure cavities are associated, and the central line of the working area is used as a positioning line during conveying. The difficulty in planning the negative pressure cavity of the negative pressure conveying platform is reduced by changing the positioning method. Firstly, determining a working area with negative pressure adsorption positioning function in the working process through fixed-point positioning operation; secondly, the distribution of the negative pressure cavities in the working area adopts a mode of symmetrically distributing along the central line of the working area, and the symmetrical negative pressure cavities are related; finally, because the fixed-point positioning operation mode is adopted, the medium needs to be positioned at a certain position of the working area during operation, and the center-to-center positioning mode is adopted for the transmission positioning of the medium, namely the operation center of the medium is aligned with the center line of the working area. Therefore, the medium is conveyed and positioned on the central line of the working area during operation, and the negative pressure cavities symmetrically distributed on the two sides of the central line of the working area can be effectively covered to the greatest extent, so that the negative pressure adsorption effect is exerted to the greatest extent.
In step S3, the medium is ensured to be accurately conveyed to the working area by sensing timing or distance or motor revolution. And when the sensing time or the sensing distance or the motor revolution is measured, the time or the distance or the motor revolution is measured based on the distance between the sensing position and the central line.
In the step S3, the medium to be conveyed passes through a paper separating area and a reinforcing area in turn before being conveyed to the working area; the paper dividing area and the reinforcing area are mediated by a resistance action point, and the negative pressure value of the reinforcing area is larger than that of the paper dividing area and the working area. When the medium part is conveyed into the reinforcing area and part is still left in the paper dividing area, if the negative pressure adsorption effect is not strong enough, the positive result before paper dividing is not guaranteed, therefore, the invention sets the reinforcing area in front of the resistance action point, increases the negative pressure value, and ensures that the negative pressure adsorption effect is enough to guard the positive result.
The invention also provides a negative pressure conveying system applying the method, which is used for conveying hard light media and comprises a negative pressure conveying platform for conveying the media from back to front and a straightening mechanism for straightening the conveyed media, wherein the negative pressure conveying platform comprises a negative pressure cavity and a conveying belt wound on the outer side of the negative pressure cavity, and an air suction hole communicated with the negative pressure cavity is formed in the conveying belt; the correcting mechanism is arranged above the rear part of the negative pressure conveying platform and comprises a guide rail, two ejection structures and at least one ejection driving device, wherein the two ejection structures are symmetrically arranged, and the at least one ejection structure is in sliding connection with the guide rail and is driven by the ejection driving device to slide along the guide rail.
After the medium is placed on the negative pressure conveying platform, instantaneous thrust is given from two sides through the straightening mechanism to prompt the medium to automatically straighten, and after the medium is straightened, the medium is conveyed forwards according to the direction after the medium is straightened due to the existence of negative pressure adsorption, so that the medium can be accurately printed. The medium is driven to be straightened by the instantaneous thrust generated under the drive of the ejection driving device, and is immediately removed after the action, so that the medium in transmission is not blocked, and the medium is not blocked; the instantaneous thrust is applied from two sides of the medium, and the medium is not damaged as long as the acting area and the acting force are proper.
The negative pressure conveying system further comprises a paper blocking mechanism for separating stacked media one by one, the paper blocking mechanism is arranged above the negative pressure conveying platform and in front of the aligning mechanism, a cross beam which spans across the negative pressure conveying platform and is perpendicular to the conveying direction is further arranged on the negative pressure conveying platform, and the paper blocking mechanism comprises a baffle plate connected to the cross beam, and the baffle plate is perpendicular to the conveying direction. The baffle plate arranged in front is used for applying a continuous resistance to the medium stack except the bottommost medium to prevent the medium stack from being conveyed forward along with the bottommost medium, so that the aim of conveying the medium one by one in a stacking manner can be fulfilled, the medium can be put on the negative pressure conveying platform one by one in a stacking manner, and the negative pressure conveying platform is not required to be put on one by a manual or mechanical arm, so that the production efficiency is greatly improved.
In order to ensure that the bottommost layer of the stacked media can pass through and the media on the bottommost layer can not pass through when being separated, the relation between the space a between the lower end of the baffle and the negative pressure conveying platform and the thickness h of the media is as follows: a epsilon (h, 2 h). The thickness of different kinds of media and different batches often varies, and in order to improve the universality of the paper separating system, the baffle lifting is connected to the cross beam, and the height of the baffle is changed by lifting the through hole, so that the baffle can meet the relation. Preferably, the baffle is connected to the cross beam through a screw lifting mechanism. More preferably, the beam is provided with at least two guide holes, at least two screw rods, at least one connecting rod and a paper separating driving device which are arranged at intervals, one side of the baffle is provided with at least two guide blocks matched with the guide holes, the guide blocks penetrate through the guide holes from one side of the beam to enter the other side of the beam and are in threaded connection with the screw rods connected to the other side of the beam, the two adjacent screw rods synchronously act through transmission of the connecting rod, and the paper separating driving device drives one screw rod.
In the place without negative pressure adsorption, a part of the medium with softer material may slightly arch, and thus may be blocked by mistake. In order to ensure that the conveyed medium can smoothly pass through, a plurality of bulges or grooves are arranged at intervals at the bottom of the baffle, so that the lower part of the baffle forms a concave-convex alternate structure, the downward convex part is opposite to the position with negative pressure adsorption effect on the negative pressure conveying platform, and the upward concave part is opposite to the position without negative pressure adsorption. In this way, even if the medium being conveyed is rugged or slightly arched, a part can pass under the baffle smoothly.
The bottom layer of the stacked media can pass through the blocking effect of the baffle plate, and the media on the bottom layer can not pass through the baffle plate, so that the aim of separating paper is fulfilled. However, when the bottommost medium is completely extracted from the stacked medium under the negative pressure adsorption effect, the second layer which is originally formed by stacking the medium from bottom to top becomes a new bottommost layer, so that the medium can be continuously conveyed, the upper part of the negative pressure conveying platform is also paved by the medium, the interval between the adjacent mediums is not adjustable, and the printing operation is not facilitated. Therefore, the negative pressure conveying system further comprises a paper ejection mechanism for supporting the medium, wherein the paper ejection mechanism is arranged on the negative pressure conveying platform between the two symmetrical ejection structures and comprises a jacking block connected to the negative pressure conveying platform in a lifting manner and a paper ejection driving device for driving the jacking block to lift, and the jacking block is higher than the upper surface of the negative pressure conveying platform when rising and is not higher than the upper surface of the negative pressure conveying platform when falling. When the medium to be conveyed is far enough, the top block descends to remove the supporting force so that the new medium at the bottom layer is absorbed again by the negative pressure and is pulled away by the conveyor belt.
At the moment that the bottommost medium is completely extracted from the piled medium under the negative pressure adsorption effect, the top block needs to rise in time to support the new bottommost medium so as to avoid the transmission of the bottommost medium caused by the negative pressure adsorption; if the top block rises too early, the bottommost medium may get stuck and cannot be conveyed continuously; if the top block rises too late, the new lowest layer media will also be transferred too early; therefore, the timing of the lifting of the top block needs to be accurately grasped. In order to solve the problem, the invention sets a roller partially exposed on the upper surface of the top block at the front part of the top block. Even if the top block rises earlier, the bottommost medium can be sent away and not blocked due to the front absorption of the gravity center under the action of the roller; also because the effect of gyro wheel, even though the kicking block rises later, because the gyro wheel sets up in the front portion, new bottom medium can not too be conveyed too early because the focus is adsorbed behind the frictional action at kicking block rear portion and the rear portion behind the back, consequently, the opportunity of kicking block rise is effectively prolonged, has reduced the precision requirement of control lift. Preferably, the front part of the top block is a 1/3 area near the front end of the top block or an area 0-100 mm away from the front end of the top block.
In order to ensure that the roller is smooth, thereby ensuring the auxiliary conveying function of the roller on the bottommost medium to be conveyed and the blocking conveying function of the roller on the new bottommost medium to be conveyed, the bottom of the top block is provided with a roller groove and a roller cover which is in matched connection with the roller groove, and the roller is arranged in a cavity formed between the roller groove and the roller cover. The installation of gyro wheel is realized through the cooperation of gyro wheel groove and gyro wheel lid, can improve the cooperation degree of gyro wheel and kicking block, improves gyro wheel smoothness nature.
The paper ejection driving device is a paper ejection cylinder connected to the side surface or the bottom of the ejector block. The invention adopts a cylinder driving mode, the ejector block can be directly connected with the paper ejection cylinder, and can also be connected with the negative pressure transmission platform through the paper ejection cylinder, so that the configuration of transmission parts is effectively reduced, the installation space is saved, and the invention is particularly applicable to large-scale complex equipment such as the negative pressure transmission platform.
For the negative pressure conveying platform with the conveying belt communicated with the negative pressure cavity, the structure of the paper ejection mechanism is preferably a strip-shaped structure extending along the conveying direction or a deep structure extending downwards, so that the connection of the air cylinder to the bottom or the front and rear sides of the top block is certainly a preferable choice. Preferably, the front side or the rear side of the top block extends forwards or backwards to form a connecting part for connecting the top paper cylinder, and the top paper cylinder is connected to the connecting part extending from the front side or the rear side. More preferably, the connecting part extends from the front lower side or the rear lower side of the top block, a stepped structure is formed between the top block and the connecting part, and the part for supporting the medium is really concentrated on the top block, so that the top block or the top paper cylinder is better prevented from being damaged due to collision. Most preferably, the top paper cylinder is connected to a connection portion extending from the front lower side, and the top paper cylinder supporting the top block is connected to a connection portion extending from the front lower side due to the presence of a deformation space, which is located behind the top paper cylinder than the rear lower side, so that it is advantageous to prevent the medium to be the new topmost layer from being transferred too early when the top block rises at night.
The upper surface of the front part of the top block is at least partially inclined forward and downward, which helps the bottommost medium to be conveyed away to be conveyed more smoothly.
The sufficiently large supporting surface can reduce the pressure of the top block to the medium to prevent the surface from deforming, and can provide more friction for the medium to be the new bottommost layer, but the cross section of the part of the top block matched with the negative pressure transmission platform is increased, so that the negative pressure density of the negative pressure transmission platform is not guaranteed and the equipment is compact. For this purpose, the top piece further comprises a support portion forming the top surface of the top piece, the cross section of the support portion being larger than the cross section of the middle portion of the top piece.
The negative pressure conveying platform is sequentially divided into an input area, a paper dividing area, a reinforcing area, a conveying area, a working area and an output area from back to front, the straightening mechanism is arranged in the paper dividing area or extends backwards to the input area, the paper blocking mechanism is arranged at the boundary between the paper dividing area and the reinforcing area, and the paper ejecting mechanism is arranged in the input area; the negative pressure values of the input area, the paper dividing area, the reinforcing area, the conveying area, the working area and the output area are P1, P2, P3, P4, P5 and P6 in sequence, and the relationship is as follows: p3 > p1=p2=p5 > p4=p6. When the medium part is conveyed into the reinforcing area and part is still left in the paper dividing area, if the negative pressure adsorption effect is not strong enough, the positive result before paper dividing is not guaranteed, and for this purpose, the reinforcing area is arranged in front of the paper blocking mechanism, and the negative pressure value is increased, so that the negative pressure adsorption effect is enough to guard the positive result. The negative pressure value P1 of the input area is 16-18 KPa, the negative pressure value P2 of the paper dividing area is 16-18 KPa, the negative pressure value P3 of the reinforcing area is 20-22 KPa, the negative pressure value P4 of the transmitting area is 11-13 KPa, the negative pressure value P5 of the working area is 16-18 KPa, and the negative pressure value P6 of the output area is 11-13 KPa.
It should be noted that "paper" in the "paper ejection mechanism", "paper separation system", and "paper blocking mechanism" refers generally to a hard and light medium such as corrugated paper, and not only to a cardboard such as corrugated paper, but also to a non-paper hard and light medium such as an extruded sheet.
Compared with the prior art, the invention has the following beneficial effects: by giving instantaneous thrust from both sides to cause automatic centering, after centering, the medium will be conveyed forward in the direction after centering due to the negative pressure adsorption, thereby ensuring that the medium can be printed accurately. The instantaneous thrust force is used for leading the medium to be aligned, and the medium is immediately removed after the action, so that the medium in the conveying process is not blocked, and the medium is not blocked; the instantaneous thrust is applied from two sides of the medium, and the medium is not damaged as long as the acting area and the acting force are proper. After the medium piles are arranged, a continuous resistance is applied to the medium piles except for the bottommost medium to prevent the medium piles from being conveyed forward along with the bottommost medium, so that the aim of conveying the medium piles one by one can be fulfilled, the medium piles can be put on the negative pressure conveying platform one by one, manual work or a mechanical arm is not needed to put the medium piles on the negative pressure conveying platform one by one, and the production efficiency is greatly improved.
Drawings
Fig. 1 is a schematic diagram of a negative pressure delivery method.
Fig. 2 is a schematic structural view of the negative pressure delivery system.
Fig. 3 is a side view of a negative pressure delivery system.
Fig. 4 is a schematic diagram of the structure of the aligning mechanism and the paper blocking mechanism.
Fig. 5 is a schematic diagram of a second structure of the aligning mechanism and the paper blocking mechanism.
Fig. 6 is a schematic structural view of the paper ejection mechanism.
Fig. 7 is an exploded view of the paper ejection mechanism.
Reference numerals illustrate: the negative pressure conveying platform 100, the negative pressure cavity 110, the conveying belt 120, the input area 101, the paper separating area 102, the reinforcing area 103, the conveying area 104, the working area 105, the output area 106, the ejecting structure 210, the baffle 310, the guide block 311, the beam 320, the guide hole 321, the screw rod 322, the connecting rod 323, the paper blocking driving device 324, the ejecting block 410, the roller 411, the roller groove 412, the roller cover 413, the connecting part 414, the supporting part 415 and the paper ejecting cylinder 420.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the positional relationship described in the drawings is for illustrative purposes only and is not to be construed as limiting the invention. The present invention will be described in further detail with reference to specific examples.
Example 1
As shown in fig. 1, a negative pressure transmission method for transmitting a hard light medium from the back to the front includes the steps of:
s1, placing a medium on a negative pressure conveying platform, wherein the negative pressure conveying platform is provided with a negative pressure cavity capable of forming a negative pressure adsorption effect on the medium;
S2, giving instantaneous thrust to the medium in the step S1 from two opposite sides to enable the medium to be aligned;
s3, conveying the medium after the straightening in the step S2 under negative pressure.
After the medium is placed on the negative pressure conveying platform, instantaneous thrust is given from two sides to enable the medium to be automatically aligned, and after the medium is aligned, the medium is conveyed forwards according to the aligned direction due to the existence of negative pressure adsorption, so that the medium can be accurately printed. The instantaneous thrust force is used for leading the medium to be aligned, and the medium is immediately removed after the action, so that the medium in the conveying process is not blocked, and the medium is not blocked; the instantaneous thrust is applied from two sides of the medium, and the medium is not damaged as long as the acting area and the acting force are proper.
In order to further improve the automation degree, in step S1, stacking the media on a negative pressure conveying platform, where the media stack is a plurality of media stacked in a pile; in the step S2, an instantaneous thrust is given to the medium stack in the step S1 to straighten the medium stack; in step S3, the first medium from bottom to top in step S2 is conveyed under negative pressure, while the second medium from bottom to top and the medium above are given a continuous resistance so as not to be conveyed. After the medium piles are arranged, a continuous resistance is applied to the medium piles except for the bottommost medium to prevent the medium piles from being conveyed forward along with the bottommost medium, so that the aim of conveying the medium piles one by one can be fulfilled, the medium piles can be put on the negative pressure conveying platform one by one, manual work or a mechanical arm is not needed to put the medium piles on the negative pressure conveying platform one by one, and the production efficiency is greatly improved.
The bottom layer of the stacked media can pass through the front layer and the media on the bottom layer can not pass through the bottom layer by giving a continuous resistance to the front layer, so that the aim of separating paper is fulfilled. However, when the bottommost medium is completely extracted from the stacked medium under the negative pressure adsorption effect, the second layer which is originally formed by stacking the medium from bottom to top becomes a new bottommost layer, so that the medium can be continuously conveyed, the upper part of the negative pressure conveying platform is also paved by the medium, the interval between the adjacent mediums is not adjustable, and the printing operation is not facilitated. To this end, in step S3, when the first medium, counted from bottom to top, is transferred to the partially or completely detached medium stack, an upward supporting force is given to the medium stack from below the medium stack so that at least the front portion thereof is detached from the negative pressure transfer stage surface. When the medium to be sent out is far enough, the supporting force is removed to enable the new medium to be absorbed by the negative pressure again and pulled away by the conveyor belt.
Each time the instantaneous pushing force acts to align the medium to be transferred, it is necessary to ensure that the instantaneous pushing force acts on both sides of the medium to align the medium as the lowest layer of the medium to be transferred first, but it is difficult to ensure that the medium is too thin, and therefore, in step S2, an upward supporting force is given to the medium stack from below the medium stack in step S1 to make at least the front part of the medium stack separate from the surface of the negative pressure transfer platform, and then an instantaneous pushing force is given to the medium stack to align the medium stack. In this way, the alignment of the media before delivery is ensured, regardless of the thickness of the media.
In step S3, the medium is conveyed to the working area, then the medium is stopped to be conveyed, the medium is conveyed continuously after the working area operation is finished, and the steps S1-S3 or S2-S3 are repeated to convey the next medium.
The central line of the working area perpendicular to the conveying direction is used as a symmetry axis, so that the negative pressure cavities of the working area are symmetrically distributed and two symmetrical or two groups of negative pressure cavities are associated, and the central line of the working area is used as a positioning line during conveying. The difficulty in planning the negative pressure cavity of the negative pressure conveying platform is reduced by changing the positioning method. Firstly, determining a working area with negative pressure adsorption positioning function in the working process through fixed-point positioning operation; secondly, the distribution of the negative pressure cavities in the working area adopts a mode of symmetrically distributing along the central line of the working area, and the symmetrical negative pressure cavities are related; finally, because the fixed-point positioning operation mode is adopted, the medium needs to be positioned at a certain position of the working area during operation, and the center-to-center positioning mode is adopted for the transmission positioning of the medium, namely the operation center of the medium is aligned with the center line of the working area. Therefore, the medium is conveyed and positioned on the central line of the working area during operation, and the negative pressure cavities symmetrically distributed on the two sides of the central line of the working area can be effectively covered to the greatest extent, so that the negative pressure adsorption effect is exerted to the greatest extent.
In step S3, the medium is ensured to be accurately conveyed to the working area by sensing timing or distance or motor revolution. And when the sensing time or the sensing distance or the motor revolution is measured, the time or the distance or the motor revolution is measured based on the distance between the sensing position and the central line.
In the step S3, the medium to be conveyed passes through a paper separating area and a reinforcing area in turn before being conveyed to the working area; the paper dividing area and the reinforcing area are mediated by a resistance action point, and the negative pressure value of the reinforcing area is larger than that of the paper dividing area and the working area. When the medium part is conveyed into the reinforcing area and part is still left in the paper dividing area, if the negative pressure adsorption effect is not strong enough, the positive result before paper dividing is not guaranteed, therefore, the invention sets the reinforcing area in front of the resistance action point, increases the negative pressure value, and ensures that the negative pressure adsorption effect is enough to guard the positive result.
Example 2
As shown in fig. 2 to 3, a negative pressure conveying system applying the method is used for conveying hard and light media, and comprises a negative pressure conveying platform 100 for conveying the media from back to front and a straightening mechanism for straightening the conveyed media, wherein the negative pressure conveying platform 100 comprises a negative pressure cavity 110 and a conveying belt 120 wound on the outer side of the negative pressure cavity 110, and the conveying belt 120 is provided with an air suction hole communicated with the negative pressure cavity 110; the aligning mechanism is disposed above the rear portion of the negative pressure delivery platform 100, and includes a guide rail, two pushing structures 210 symmetrically disposed, and at least one pushing driving device, where at least one pushing structure 210 is slidably connected to the guide rail and is driven by the pushing driving device to slide along the guide rail.
After the medium is placed on the negative pressure conveying platform 100, instantaneous thrust is given from two sides through the centering mechanism to enable the medium to automatically center, and after centering, the medium is conveyed forwards according to the direction after centering due to the existence of negative pressure adsorption, so that accurate printing of the medium is ensured. The medium is driven to be straightened by the instantaneous thrust generated under the drive of the ejection driving device, and is immediately removed after the action, so that the medium in transmission is not blocked, and the medium is not blocked; the instantaneous thrust is applied from two sides of the medium, and the medium is not damaged as long as the acting area and the acting force are proper.
As shown in fig. 4 to 5, the negative pressure conveying system further includes a paper blocking mechanism for separating the stacked media one by one, the paper blocking mechanism is disposed above the negative pressure conveying platform 100 and in front of the aligning mechanism, a cross beam 320 crossing the negative pressure conveying platform 100 and perpendicular to the conveying direction is further disposed on the negative pressure conveying platform 100, the paper blocking mechanism includes a baffle 310 connected to the cross beam 320, and the baffle 310 is perpendicular to the conveying direction. The medium stack except the bottommost medium is prevented from being conveyed forward by applying a continuous resistance to the medium stack except the bottommost medium through the baffle 310 arranged in front, so that the aim of conveying the medium stack one by one can be fulfilled, the medium can be put on the negative pressure conveying platform 100 in a stacked manner, and the medium stack is not required to be put on the negative pressure conveying platform 100 one by a manual or mechanical arm, so that the production efficiency is greatly improved.
To ensure that the bottommost layer of the stacked media can pass and the media on the bottommost layer can not pass when being separated, the relationship between the distance a between the lower end of the baffle 310 and the negative pressure conveying platform 100 and the thickness h of the media is as follows: a epsilon (h, 2 h). The thickness of different kinds of media and different batches of media often varies, and in order to improve the universality of the paper separating system, the baffle 310 is lifted and connected to the beam 320, and the height of the baffle 310 is changed by lifting and lowering the through hole so as to enable the height to meet the relationship. Preferably, the baffle 310 is connected to the cross beam 320 by a lead screw 322 lifting mechanism. More preferably, the beam 320 is provided with at least two guide holes 321, at least two screw rods 322, at least one connecting rod 323 and a paper blocking driving device 324 which are arranged at intervals, one side of the baffle 310 is provided with at least two guide blocks 311 matched with the guide holes 321, the guide blocks 311 penetrate through the guide holes 321 from one side of the beam 320 to enter the other side of the beam 320 and are in threaded connection with the screw rods 322 connected to the other side of the beam 320, the adjacent two screw rods 322 synchronously act through transmission of the connecting rod 323, and the paper blocking driving device 324 drives one screw rod 322.
In the place without negative pressure adsorption, a part of the medium with softer material may slightly arch, and thus may be blocked by mistake. In order to ensure that the conveyed medium can smoothly pass through, a plurality of protrusions or grooves are arranged at intervals at the bottom of the baffle 310, so that the lower part of the baffle 310 forms a concave-convex alternate structure, the downward protruding part is opposite to the position with negative pressure adsorption effect on the negative pressure conveying platform 100, and the upward protruding part is opposite to the position without negative pressure adsorption effect. In this way, even if the medium being conveyed is rugged or slightly arched, a portion can pass under the baffle 310 smoothly.
The lowermost layer of the stacked media can pass through the barrier effect of the baffle 310 and the media on the lowermost layer can not pass through the barrier effect, so that the purpose of separating paper is achieved. However, when the bottommost medium is completely extracted from the stacked medium under the negative pressure adsorption effect, the second layer which is originally formed by stacking the medium from bottom to top becomes a new bottommost layer, so that the medium can be continuously conveyed, the upper part of the negative pressure conveying platform 100 is also fully paved by the medium, the interval between the adjacent mediums is not adjustable, and the printing operation is not facilitated. For this reason, the negative pressure conveying system further includes a paper ejection mechanism for supporting the medium, as shown in fig. 6 to 7, where the paper ejection mechanism is disposed on the negative pressure conveying platform 100 between two symmetrical ejection structures 210, and includes a top block 410 connected to the negative pressure conveying platform 100 in a lifting manner and a paper ejection driving device for driving the top block 410 to lift, where the top block 410 is higher than the upper surface of the negative pressure conveying platform 100 when rising and not higher than the upper surface of the negative pressure conveying platform 100 when falling. The paper ejection mechanism can timely support the medium to be the new bottommost layer to make at least the front part leave the surface of the negative pressure conveying platform 100 and temporarily lose the acting force of negative pressure adsorption when the bottommost layer medium is about to be conveyed away, so that the medium cannot be conveyed, and the top block 410 timely descends to remove the supporting force when the conveyed medium is far enough to make the new bottommost layer medium be absorbed again by the negative pressure and pulled away by the conveying belt 120.
At the moment that the bottommost medium is completely extracted from the stacked media under the negative pressure adsorption effect, the top block 410 needs to rise in time to support the new bottommost medium to avoid the transmission caused by the negative pressure adsorption; if the top block 410 rises too early, the bottommost media may become stuck and not continue to be transported; if the top block 410 rises too late, new lowest layer media may also be transferred too early; therefore, the time point at which the top block 410 is lifted and lowered needs to be precisely grasped. To solve this problem, the present invention provides a roller 411 partially exposed on the upper surface of the top block 410 at the front of the top block 410. Even if the top block 410 rises earlier, the bottommost medium is sent away without being jammed due to the front gravity center adsorption by the roller 411; also, due to the roller 411, even if the top block 410 rises late, since the roller 411 is disposed at the front, a new bottommost medium is not transferred prematurely due to the frictional effect of the gravity center being absorbed behind and behind the top block 410, so that the timing of the rising of the top block 410 is effectively prolonged, and the accuracy requirement for controlling the rising and falling is reduced. Preferably, the front portion of the top block 410 is a 1/3 area near the front end of the top block 410 or an area 0-100 mm from the front end of the top block 410.
In order to ensure the roller 411 to be smooth and thus ensure the auxiliary feeding effect of the bottommost medium to be fed and the blocking effect of the new bottommost medium to be fed, the bottom of the top block 410 is provided with a roller groove 412 and a roller cover 413 in matched connection with the roller groove 412, and the roller 411 is arranged in a cavity formed between the roller groove 412 and the roller cover 413. The roller 411 is mounted by the cooperation of the roller slot 412 and the roller cover 413, so that the cooperation degree of the roller 411 and the top block 410 can be improved, and the smoothness of the roller 411 can be improved.
The top paper driving device is a top paper cylinder 420 connected to the side or bottom of the top block 410. The invention adopts a cylinder driving mode, the top block 410 can be directly connected with the paper ejection cylinder 420, and can also be connected with the negative pressure transmission platform 100 through the paper ejection cylinder 420, thereby effectively reducing the configuration of transmission parts, saving the installation space, and especially on large-scale complex equipment such as the negative pressure transmission platform 100.
For the negative pressure transfer platform 100 in which the transfer belt 120 communicates with the negative pressure chamber 110, the structure of the paper ejection mechanism is preferably a long strip structure extending in the transfer direction or a deep structure extending downward, and therefore, it is certainly preferable to connect the air cylinder to the bottom or front and rear sides of the top block 410. Preferably, the front side or the rear side of the top block 410 extends forward or backward to form a connecting portion 414 for connecting the top paper cylinder 420, and the top paper cylinder 420 is connected to the connecting portion 414 extending from the front side or the rear side, so that compared with the top block 410 directly connected to the bottom of the top block 410, the top block 410 has a certain elastic deformation space, and the top paper cylinder 420 is prevented from being damaged. More preferably, the connecting portion 414 extends from the front lower side or the rear lower side of the top block 410, a stepped structure is formed between the top block 410 and the connecting portion 414, and the portion supporting the medium is actually concentrated on the top block 410, so as to better avoid damage to the top block 410 or the top paper cylinder 420 caused by collision. Most preferably, the top paper cylinder 420 is connected to the connecting portion 414 extending from the front lower side, and the top paper cylinder 420 supporting the top block 410 is connected to the connecting portion 414 extending from the front lower side due to the presence of the deformation space, so that the deformation space is present behind the top paper cylinder 420, which is advantageous in preventing the medium to be the new topmost layer from being transferred too early when the top block 410 rises at night, compared to the rear lower side.
The upper surface of the front portion of the top block 410 is at least partially sloped forward and downward to facilitate the transfer of the bottommost media to be transferred.
A sufficiently large support surface reduces the deformation of the pressure-preventing surface of the medium by the top piece 410, and provides more friction for the medium to be the new bottommost layer, but the cross section of the portion of the top piece 410 mating with the negative pressure delivery platform 100 increases, which is detrimental to the guarantee of the negative pressure density of the negative pressure delivery platform 100 and the compactness of the apparatus. For this, the top block 410 further includes a support portion 415 forming an upper surface of the top block 410, and the support portion 415 has a cross section greater than that of a middle portion of the top block 410.
The negative pressure conveying platform 100 is sequentially divided into an input area 101, a paper dividing area 102, a reinforcing area 103, a conveying area 104, a working area 105 and an output area 106 from back to front, the straightening mechanism is arranged at the paper dividing area 102 or extends backwards to the input area 101, the paper blocking mechanism is arranged at the boundary between the paper dividing area 102 and the reinforcing area 103, and the paper ejection mechanism is arranged at the input area 101; the negative pressure values of the input area 101, the paper dividing area 102, the reinforcing area 103, the transmitting area 104, the working area 105 and the output area 106 are P1, P2, P3, P4, P5 and P6 in sequence, which satisfy the following relations: p3 > p1=p2=p5 > p4=p6. When the medium part is transferred into the reinforcing area 103 and the part is still left in the paper dividing area 102, if the negative pressure adsorption effect is not strong enough, the result of the paper dividing front alignment cannot be guaranteed, and for this purpose, the reinforcing area 103 is arranged in front of the paper blocking mechanism, and the negative pressure value is increased, so that the negative pressure adsorption effect is enough to guard the result of the paper dividing front alignment. The negative pressure value P1 of the input area 101 is 16-18 KPa, the negative pressure value P2 of the paper dividing area 102 is 16-18 KPa, the negative pressure value P3 of the reinforcing area 103 is 20-22 KPa, the negative pressure value P4 of the conveying area 104 is 11-13 KPa, the negative pressure value P5 of the working area 105 is 16-18 KPa, and the negative pressure value P6 of the output area 106 is 11-13 KPa.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (4)
1. A negative pressure transmission method is used for transmitting hard light media from back to front by adopting a negative pressure transmission system and is characterized in that,
The negative pressure conveying system comprises a negative pressure conveying platform for conveying media from back to front, a straightening mechanism for straightening conveyed media, a paper blocking mechanism for separating stacked media one by one and a paper ejecting mechanism for supporting the media, wherein the negative pressure conveying platform comprises a negative pressure cavity and a conveying belt wound on the outer side of the negative pressure cavity, and an air suction hole communicated with the negative pressure cavity is formed in the conveying belt; the correcting mechanism is arranged above the rear part of the negative pressure conveying platform and comprises a guide rail, two ejection structures and at least one ejection driving device, wherein the two ejection structures are symmetrically arranged, and the at least one ejection structure is in sliding connection with the guide rail and is driven by the ejection driving device to slide along the guide rail; the paper blocking mechanism is arranged above the negative pressure conveying platform and in front of the straightening mechanism, a cross beam which spans the negative pressure conveying platform and is perpendicular to the conveying direction is further arranged on the negative pressure conveying platform, and the paper blocking mechanism comprises a baffle plate connected to the cross beam, and the baffle plate is perpendicular to the conveying direction; the paper ejection mechanism is arranged on the negative pressure conveying platform between the two symmetrical ejection structures and comprises an ejector block connected to the negative pressure conveying platform in a lifting manner and a paper ejection driving device for driving the ejector block to lift, wherein the ejector block is higher than the upper surface of the negative pressure conveying platform when rising and is not higher than the upper surface of the negative pressure conveying platform when falling;
The front part of the top block is provided with a roller partially exposed on the upper surface of the top block, even if the top block rises earlier, the medium at the bottom layer can be conveyed away and not blocked due to the front adsorption of the gravity center under the action of the roller; also because the roller is arranged at the front part, the new bottommost medium can not be transferred too early due to the absorption of the gravity center at the rear part and the friction at the rear part of the top block, the lifting time of the top block is effectively prolonged, and the lifting precision control requirement is reduced;
The upper surface of the front part of the top block is at least partially inclined forwards and downwards, the top paper driving device is a top paper cylinder connected to the side surface of the top block, the top paper cylinder is connected to a connecting part extending from the front lower side, a stepped structure is formed between the top block and the connecting part, so that the top block is provided with a certain elastic deformation space, the top paper cylinder which supports the top block is connected to the connecting part extending from the front lower side due to the existence of the deformation space, and compared with the rear lower side, the deformation space exists behind the top paper cylinder, thereby being beneficial to preventing a new top-layer medium from being prematurely conveyed when the top block rises at night;
The negative pressure transmission method comprises the following steps:
S1, stacking media on a negative pressure conveying platform, wherein the media stack is formed by stacking a plurality of media, and the negative pressure conveying platform is provided with a negative pressure cavity capable of forming a negative pressure adsorption effect on the media;
S2, giving an upward supporting force to the medium stack from the lower part of the medium stack in the step S1 to enable at least the front part of the medium stack to leave the surface of the negative pressure transmission platform, and giving an instantaneous pushing force to the medium stack in the step S1 from two opposite sides to enable the medium stack to be aligned;
S3, conveying the first medium from bottom to top after the straightening in the step S2 under negative pressure, simultaneously giving continuous resistance to the second medium from bottom to top and the medium above so that the first medium is not conveyed, and when the first medium from bottom to top is conveyed to a part or completely separated from the medium stack, giving an upward supporting force to the medium stack from below the front part of the medium stack through the roller so that at least the front part of the medium stack is separated from the surface of the negative pressure conveying platform.
2. The negative pressure transmission method according to claim 1, wherein in step S3, the transmission is stopped after the medium is transmitted to the working area, the transmission is continued after the work in the working area is completed, and the next medium is transmitted by repeating steps S1 to S3 or S2 to S3; the central line of the working area perpendicular to the conveying direction is used as a symmetry axis, so that the negative pressure cavities of the working area are symmetrically distributed and two symmetrical or two groups of negative pressure cavities are associated, and the central line of the working area is used as a positioning line during conveying.
3. The negative pressure transfer method according to claim 2, wherein in step S3, the transferred medium passes through the paper separation section and the reinforcing section in this order before being transferred to the working section; the paper dividing area and the reinforcing area are mediated by a resistance action point, and the negative pressure value of the reinforcing area is larger than that of the paper dividing area and the working area.
4. The negative pressure conveying method according to claim 1, wherein the negative pressure conveying platform is divided into an input area, a paper dividing area, a reinforcing area, a conveying area, a working area and an output area from back to front, the straightening mechanism is arranged in the paper dividing area or extends backwards to the input area, the paper blocking mechanism is arranged at the boundary between the paper dividing area and the reinforcing area, and the paper ejection mechanism is arranged in the input area; the negative pressure values of the input area, the paper dividing area, the reinforcing area, the conveying area, the working area and the output area are P1, P2, P3, P4, P5 and P6 in sequence, and the relationship is as follows: p3 > p1=p2=p5 > p4=p6.
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