CN104249942B - Paper stop mechanism with guide elements and automatic paper feeder for it - Google Patents

Abstract

The invention provides a paper stopping mechanism with a guiding element and an automatic paper feeding device applicable to the paper stopping mechanism, wherein the paper stopping mechanism comprises: the guiding element is provided with a shaft sleeve part, an extension arm, a convex part and a blocking part, and the shaft sleeve part is sleeved on the shaft part of the paper taking roller; the paper blocking element is provided with a paper blocking part, a plug pin and a supported part, the extension arm of the guide element upwards supports against the supported part of the paper blocking element, the supported part is arranged between the convex part and the shaft sleeve part, and the paper blocking part is inserted in the accommodating groove; a guide slot for accommodating the plug pin of the paper blocking element; when the paper taking roller approaches the paper feeding tray, the guiding element linked with the paper taking roller through the shaft sleeve part can drive the paper blocking part of the paper blocking element to ascend to separate from the accommodating groove and drive the bolt of the paper blocking element to move in the guide groove, so that the supported part spans between the convex part and the blocking part from the space between the convex part and the shaft sleeve part, and paper is conveyed to the paper guiding path through the paper blocking part.

Description

Paper stop mechanism with guide elements and automatic paper feeder for it

technical field

The invention relates to an automatic paper feeding device, in particular to a paper blocking mechanism with a guide element and an automatic paper feeding device which is applicable thereto.

Background technique

With the rapid advancement of electronic technology, all routine work in the office today is closely related to business machines such as copiers, fax machines, printers, and scanners. Therefore, these business machines have become indispensable information equipment in the office. However, because many business machines often occupy too much space, and even because the utilization rate of each business machine is not the same, it usually results in that although some types of business machines have low utilization rates, they still have to be purchased to cope with occasional problems. required situation.

In order to solve these problems and conform to the development trend of today's information products towards "miniaturization" and "functional integration", a multi-functional business machine (MFP) with functions of copying, printing, faxing and scanning was developed. , so consumers only need to purchase a multi-functional business machine to perform multiple common tasks, and can reduce the occupation of space in the work environment and improve work quality and efficiency. It is very convenient in application and life.

However, regardless of whether it is a single-function business machine or a multi-function business machine, an automatic document feeder (Automatic Document Feeder) will be installed to transfer the paper (such as originals) stacked on the paper supply tray to the image processing mechanism in the business machine for faxing , copying, printing or scanning, etc., and in order to prevent the paper from slipping into the paper separation device before the paper is picked up, the automatic paper feeding device is usually equipped with a paper stop mechanism to ensure that the paper is placed on the paper guide frame without a paper stop And the function of finishing the leading edge of the paper.

Please refer to FIG. 1 , which is a schematic structural diagram of a known automatic paper feeding device. As shown in FIG. 1 , the known automatic paper feeding device 1 includes a paper stopper 11, a paper pick-up roller 12 and a guide member 13, which guides the paper stopper 11 to the guide of the cover (not shown) through the guide member 13. The paper stop portion 112 of the paper stop member 11 stops at the leading edge of the paper to achieve the function of paper stop. When picking up paper, the rotating shaft 121 of the pick-up roller 12 drives the guide element 13, so that the paper stopper 11 is tilted up to allow the paper to be fed normally. After the paper is taken, the paper stopper 11 returns to the original paper stopper Location.

However, the known paper blocking element 11 is fixed by the guide groove and the pin 111 on the paper blocking element 11 and cannot rotate, so as to achieve the paper blocking function. However, the known paper stopper 11 has only one supporting point of the pin 111 to stop the paper, which causes the paper stopper to be inaccurate, and the support point of the paper stopper is inelastic. When taking paper, the paper stopper 11 is likely to be stuck, and the paper stopper cannot be released smoothly. And after the paper is taken, the paper stop member 11 cannot return to the paper stop position correctly.

Therefore, how to develop a paper stop mechanism with a guide element and an automatic paper feeding device for it is an urgent problem to be solved at present.

Contents of the invention

The main purpose of the present invention is to provide a paper stop mechanism with a guide element and its applicable automatic paper feeding device, so as to solve the problem that the known paper stop element has only one support point of the pin to stop the paper, which causes the paper stop to be inaccurate, and The support point of the paper stopper is inelastic, and it is easy to cause the paper stopper to get stuck when the paper is taken out, and the paper stopper cannot be removed smoothly, and the paper stopper cannot return to the paper stopper position correctly after the paper is taken out.

In order to achieve the above-mentioned purpose, a broader embodiment of the present invention is to provide a paper stopping mechanism, which is suitable for an automatic paper feeding device. The automatic paper feeding device has a paper pickup roller and a paper feeding tray. The mechanism includes: a guiding element, which has a shaft sleeve, an extension arm, a convex portion and a blocking portion, the convex portion is arranged between the blocking portion and the shaft sleeve, and the shaft sleeve is sleeved on the On a shaft portion of the paper pickup roller; a paper retaining element has a paper retaining portion, a pin and a resisting portion, wherein the extension arm of the guiding element abuts upward against the resisting portion of the paper retaining element , the abutting portion is arranged between the convex portion and the shaft sleeve portion, the paper blocking portion is inserted into an accommodating groove; a guide groove is used for accommodating the pin of the paper blocking element; wherein, when When the paper-feeding roller approaches the paper supply tray, the guide element linked with the paper-feeding roller through the shaft sleeve will drive the paper-stopping part of the paper-stopping element to rise away from the accommodating groove, and drive The pin of the paper blocking element moves in the guide groove, so that the resisted portion spans from between the convex portion and the sleeve portion to between the convex portion and the blocking portion, so that a paper passes through the paper blocking portion The part is transported to a paper guide path.

Another broad implementation aspect of the present invention is to provide an automatic paper feeding device, which at least includes: an accommodating slot; a paper feeding tray on which at least one paper is stacked; a paper picking roller for contacting and feeding the paper on the paper feed tray; and a paper stop mechanism for blocking the paper on the paper feed tray or allowing the paper to enter a paper guide path in response to the action of the pickup roller, the paper stop mechanism It includes: a guide element, which has a shaft sleeve, an extension arm, a protrusion and a blocking portion, the protrusion is arranged between the blocking portion and the shaft sleeve, and the shaft sleeve is sleeved on the taking On a shaft portion of the paper roller; a paper retaining element has a paper retaining portion, a pin and an abutting portion, wherein the extension arm of the guiding element abuts against the abutting portion of the paper retaining element upwards, The abutting part is arranged between the convex part and the shaft sleeve part, the paper stop part is inserted in the accommodating groove; a guide groove is used for accommodating the pin of the paper stop element; wherein, when the paper stop part When the paper-feeding roller approaches the paper supply tray, the guide element linked with the paper-feeding roller through the shaft sleeve will drive the paper-stopping part of the paper-stopping element to rise away from the accommodating groove, and drive the The pin of the paper blocking element moves in the guide groove, so that the abutting portion spans from between the convex portion and the sleeve portion to between the convex portion and the blocking portion, so that the paper passes through the paper blocking portion and sent to the paper guide path.

The present invention has a paper stop mechanism with guide elements and the applicable automatic paper feeding device, which avoids that the paper stop in the known automatic paper feeding device is not accurate enough, the support point of the paper stop is inelastic, and the paper stop element is likely to be stuck when taking paper. The paper blocking cannot be successfully released, and the paper blocking element cannot be correctly returned to the paper blocking position after the paper is taken, which has a better effect than the known automatic paper feeding device.

Description of drawings

FIG. 1 is a schematic structural diagram of a known automatic paper feeding device.

Fig. 2 is a schematic structural diagram of the combination of the automatic paper feeding device and the cover in a preferred embodiment of the present invention.

FIG. 3A is a schematic structural view of the cover in FIG. 2 after removal.

FIG. 3B is a schematic structural view of the paper fetching arm in FIG. 3A after being removed.

4A-4E are schematic diagrams of the action mode of the paper blocking mechanism of the present invention.

The components and corresponding labels in the accompanying drawings are as follows:

Automatic paper feeding device: 1, 2

Paper blocking element: 11, 231

Pin: 111

Paper stop: 112, 2311

Paper pickup roller: 12, 21

Shaft: 121

Guide elements: 13

Cover: 20

Next door: 201, 202

Separation Roller: 22

Shaft: 221, 211

Gear: 212, 222

Paper blocking mechanism: 23

Plug: 2312

Through holes: 2313

Receiving Department: 2314

Guide elements: 232

Shaft part: 2321

Extension arm: 2322

subject to top: 23221

Convex part: 2323

Blocking Department: 2324

Guide groove: 233

Line department: 2331

Guidance Department: 2332

First slope: 23321

Second slope: 23322

Elastic elements: 234

Abutting elements: 235

Paper supply tray: 24

Pick up arm: 25

Transmission gear sets: 26

System Principals: 27

Storage slots: 271

Paper guide path: X

Paper: P

detailed description

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the present invention can have various changes in different aspects without departing from the scope of the present invention, and the description and drawings therein are used as illustrations in nature and not for limitation this invention.

The automatic paper feeding device of the present invention is applied to an image processing system for feeding paper stacked on a paper feeding tray, wherein the image processing system can be, for example, a scanner, a copier, a printer, a facsimile machine or a multifunctional business machine , and not limited to this.

Please refer to Fig. 2, Fig. 3A, Fig. 3B and Fig. 4A-Fig. 4E, in which Fig. 2 is a schematic diagram of the structure of the combination of the automatic paper feeding device and the cover in a preferred embodiment of the present invention, and Fig. 3A is the removal of the cover in Fig. 2 Figure 3B is a structural schematic diagram of removing the paper-feeding arm in Figure 3A, Figure 4A-Figure 4E is a schematic diagram of the action mode of the paper stop mechanism of the present invention, as shown in the figure, the automatic paper feeding device 2 of the present invention The cover body 20 mainly includes a paper pickup roller 21, a paper separation roller 22 and a paper blocking mechanism 23, and is driven by a driving device (not shown) to stack multiple sheets on the paper feeding tray 24 (shown in FIG. 4A-fig. 4E) the paper P (such as the original document) is conveyed to the paper guide path X (as shown in FIG. 4C ) one by one, so as to be conveniently conveyed to the image processing device for image processing.

In this embodiment, the shaft portion 221 of the paper separation roller 22 is directly or indirectly connected to the driving device, so that the paper separation roller 22 can rotate in response to the driving device. A paper pickup arm 25 is arranged between the paper separation roller 22 and the paper pickup roller 21 to connect the paper separation roller 22 and the paper pickup roller 21, and the paper pickup arm 25 can be a rotating shaft through the shaft portion 221 of the paper separation roller 22 to respond to The action of the paper separation roller 22 or the driving device drives the paper pickup roller 21 to approach or leave the paper supply tray 24 . In addition, in some embodiments, the shaft portion 211 of the pickup roller 21 can be fixed with the gear 212, and the shaft portion 221 of the separation roller 22 can also be fixed with the gear 222, and the gap between the pickup roller 21 and the separation roller 22 can be set. Transmission gear set 26, the transmission gear set 26 can cooperate with the gear 212 on the shaft portion 211 of the paper pickup roller 21 and the gear 222 on the shaft portion 221 of the paper separation roller 22, so that the paper pickup roller 21 can respond to paper separation The rotation of the roller 22 rotates, so that the paper pickup roller 21 drives the paper to move toward the paper guide path X when it contacts the paper. Of course, in some embodiments, the transmission gear set 26 can also be replaced by a transmission belt (not shown), but it is not limited thereto.

The paper blocking mechanism 23 is disposed at the entrance of the paper guiding path X, and is used for blocking the paper P stacked on the paper feeding tray 24 or allowing the paper P to enter the paper guiding path X in response to the action of the paper pickup roller 21 . As shown in Fig. 2 and Fig. 3A and Fig. 3B, the paper stop mechanism 23 includes a paper stop element 231, a guide element 232, a guide groove 233, an elastic element 234 and an abutting element 235, wherein the paper stop element 231 is used for removing Prevent the paper P stacked on the paper feeding tray 24 from entering the paper guide path X before the paper moves, and has the function of sorting the leading edge of the paper. One end of the guide element 232 is sleeved on the shaft part 211 of the paper pickup roller 21, and the other end touches the top The paper stopper 231 is used to drive the paper stopper 231 to rise when the paper pick-up roller 21 approaches the paper supply tray 24 to take paper, and drives the paper stopper 231 to move in the guide groove 233, so that the paper stopper 231 The paper can be fed smoothly without being blocked by the front edge of the paper, and the resisting element 234 serves as a fulcrum for the guiding element 231 to rotate.

In this embodiment, as shown in FIG. 3A and FIG. 3B , the paper stopper 231 includes a paper stopper 2311 , a pin 2312 , a through hole 2313 and an abutting part 2314 , wherein the paper stopper 2311 is disposed on the side of the paper stopper 231 The lower end portion is inserted into the accommodating groove 271 of the system main body 27 of the image processing system (as shown in FIG. 4A ) at the lower end portion of the paper stopper 2311 before the paper picking operation, so as to block the paper P stacked on the paper feeding tray 24 Enter the paper guide path X, wherein the accommodation groove 271 is set on the paper guide path X (as shown in FIG. 4C ), and the pin 2312 can be set between the through hole 2313 and the paper stop part 2311 and symmetrically arranged on the paper stop member 231 The two opposite sides of each other are inserted into the guide groove 233 (as shown in FIG. 4A ) to limit the movement of the paper stop member 231. The through hole 2313 is opened at the upper end of the paper stop member 231 and has a top end. The crossbar is used as the receiving part 2314.

The guide element 232 includes a sleeve portion 2321, an extension arm 2322, a convex portion 2323 and a blocking portion 2324, wherein one side of the guide element 232 is sleeved on the shaft of the pickup roller 21 through the sleeve portion 2321 On the part 211, the extension arm 2322 is connected with the sleeve part 2321, and extends toward the paper feeding direction, and passes through the through hole 2313 of the paper stop member 231, and has a receiving top 23221, which is set corresponding to the abutment member 234, In this embodiment, the receiving top 23221 can be but not limited to a ㄇ-shaped structure, the convex part 2323 and the blocking part 2324 are separately arranged on the top surface of the extension arm 2322, and the convex part 2323 is arranged on the blocking part 2324 and the bushing Between the parts 2321 , and the blocking part 2324 is disposed at the end of the extension arm 2322 .

Please refer to FIG. 2 again, the paper stop mechanism 23 is arranged between two adjacent partition walls 201, 202 on the cover 20 of the automatic paper feeding device 2, and the guide groove 233 is formed on the corresponding two pins 2312 of the paper stop member 231. On the two partition walls 201 , 202 , the resisting element 234 is a plate extending inwardly from the two partition walls 201 , 202 and is disposed below the guide element 232 . As shown in Fig. 2 and Fig. 4A-Fig. 4E, the guide groove 233 is a special-shaped hole, which can be roughly divided into a straight part 2331 and a guide part 2332, wherein the straight part 2331 is arranged perpendicular to the horizontal line, and it is arranged in the guide groove The bottom of 233 can be, but not limited to, a vertical long hole shape, and its aperture is slightly larger than the width of the pin 2312 of the paper blocking element 231. The guide part 2332 is connected with the straight part 2331 and is inclined towards the direction of the paper pickup roller 21. The diameter of the hole is larger than that of the straight portion 2331 to provide a space for the pin 2312 of the paper blocking element 231 to move therein.

Furthermore, please refer to FIG. 4A again, the guiding portion 2332 of the guide groove 233 has a first inclined surface 23321 and a second inclined surface 23322 corresponding to the first inclined surface 23321, the first inclined surface 23321 and the second inclined surface The inclined surface 23322 is inclined towards the paper pickup roller 21 , and the first inclined surface 23321 is adjacent to the paper pickup roller 21 . Please refer to Fig. 2, Fig. 4A-Fig. 4E again, the paper stop mechanism 23 further has an elastic element 234, which is adjacent to the straight line portion 2331 of the guide groove 233, which can be but not limited to be made of foam or shrapnel When the pin 2312 of the paper blocking element 231 is disposed on the straight portion 2331 , the elastic element 234 will collide with the pin 2312 to provide an elastic force to the paper blocking portion 2311 through the pin 2312 .

Referring to FIG. 4A-FIG. 4E, the operation mode of the paper stop mechanism of the present invention will be described in conjunction with the structure shown in FIG. 2 and FIG. 3A and FIG. 3B. First, as shown in FIG. 4A , in the standby state, that is, before the paper pickup roller 21 picks up paper, the paper stopper 2311 of the paper stopper 231 is inserted into the accommodating groove 271 and contacts the stack on the paper supply tray 24. The leading edge of the paper P to prevent the paper P from entering the paper guide path x. At the same time, the pin 2312 of the paper stop member 231 is accommodated in the straight line portion 2331 of the guide groove 233, and the abutting portion 2314 of the paper stop member 231 It is disposed between the convex portion 2323 and the sleeve portion 2321 , and is in contact with the abutting portion 2314 .

Please refer to Fig. 4A again, when the paper P is put into the paper feeding tray 24, it will stop in front of the paper stop portion 2311 of the paper stop member 231 due to the paper stop function of the paper stop member 231, at this time the latch of the paper stop member 231 2312 will be set in the straight line portion 2331 of the guide groove 233 and interfere with the pin 2312 of the paper stopper 231, that is, the pin 2312 will push against the elastic element 234, and the elastic element 234 will give the pin 2312 a force in the direction of the paper P , so as to transmit the force to the paper stopper 2311, so that the paper P rebounds slightly, which can effectively prevent the force of putting the paper P into the paper supply tray 24 from being too large, and when the paper is to be picked up, the paper stopper 231 will The latch pin 2312 is stuck in the straight line portion 2331 of the guide groove 233 so that the entire paper blocking element 231 cannot be lifted. In addition, the paper stop portion 2311 of the paper stop member 231 will also be inserted into the accommodating groove 271 on the paper guide path X before the paper is picked up. Therefore, when the paper P is put into the paper feeding tray 24, the paper stop member The pin 2312 is used as a support point above the 231, and the paper stop part 2311 is used as another support point below. There are two fulcrums to support the paper stop, so that the paper stop element 231 can more reliably achieve the effect of paper stop.

Please refer to Fig. 4B, when the automatic paper feeding device 2 receives the paper feeding instruction, the paper separation roller 22 will be driven by the driving device to rotate, and at the same time, the paper fetching arm 25 takes the shaft portion 221 of the paper separation roller 22 as the rotating shaft to drive The paper pickup roller 21 rotates downward and approaches the paper supply tray 24, and through the transmission of the transmission gear set 26, the paper pickup roller 21 will rotate in response to the rotation of the paper separation roller 22 to contact and feed the paper P on the paper supply tray 24. .

When the paper pickup roller 21 approaches the paper supply tray 24 downwards, since the bushing portion 2321 of the guide element 232 is sleeved on the shaft portion 211 of the paper pickup roller 21, the paper pickup roller 21 approaches the paper supply tray downwards. In the process of 24, the pick-up roller 21 will drive the bushing part 2321 to descend and rotate with the bushing part 2321 as the rotation axis, and the receiving top 23221 of the extension arm 2322 of the guide element 232 will touch from the partition wall 201, 202 to the The abutting element 235 extending inward, and using the abutting element 235 as a fulcrum, makes the extension arm 2322 and the convex part 2323 abut against the abutting part 2314 of the paper blocking element 231 and lifts the paper blocking element 231 upwards, that is, the paper blocking element The receiving part 2314 of 231 is pushed by the convex part 2323 and the extension arm 2322 between the convex part 2323 and the receiving top 23221, so that the paper stop member 231 is lifted up due to the principle of leverage, and then drives the paper stop part 2311 to rise and After disengaging from the accommodating groove 271 , the pin 2312 of the paper blocking element 231 will disengage from the straight portion 2331 of the guide groove 233 and move from the straight portion 2331 to the first inclined surface 23321 .

Please refer to Fig. 4C, when the paper pick-up roller 21 continues to descend, the pin 2312 of the paper stop member 231 will be guided by the first inclined surface 23321 so that the paper stop member 231 continues to incline toward the paper pick-up roller 21, so that the paper stop The element 231 can be away from the paper guide path X, and when the pick-up roller 21 touches the paper P, it will start to take the paper, so that the uppermost paper P is transported to the paper guide path X through the paper stopper 2311 .

At this time, due to the large drop of the paper pickup roller 21, the top 23221 of the extension arm 2322 of the guide element 232 is supported by the abutting element 235 of the cover body 20 and rotates with the sleeve part 2321 as the rotation axis. The convex part 23623 of the guide element 232 is crossed to the other side of the abutment element 234, which can be but not limited to span from the left side to the right side of the abutment element 234, and the abutment part of the paper stop element 231 is formed by The protruding portion 2323 and the sleeve portion 2321 straddle between the protruding portion 2323 and the blocking portion 2324 .

Please refer to Fig. 4D, when the paper pickup roller 21 finishes picking up the paper, the paper pickup roller 21 will reversely rotate back to the original position, and drive the guide element 232 to rotate back to the original position. The paper P sneaks away, that is, the paper P moves forward and covers the top of the accommodating groove 271, and the paper P will block the opening above the accommodating groove 271, but at this time the extension arm 2322 of the guide element 232 is not in contact with the abutting element. 235 connection, therefore, the guide element 232 can be rotated by the shaft sleeve portion 2321 as the rotation axis, so that the paper stop portion 2311 of the paper stop member 231 will not be forcibly inserted back into the accommodating groove 271, and the paper P that has moved in advance will not be risk of rupture.

Please refer to FIG. 4E , when the paper pickup roller 21 finishes picking up the paper, the paper pickup roller 21 will rotate upwards in the opposite direction away from the paper supply tray 24 to return to the original position, and it will drive the guide element 232 to rotate back to the original position to make the paper pickup The shaft portion 211 of the roller 21 drives the guide element 231 and the paper blocking element 231 to descend through the shaft sleeve portion 2321 , and at this time, the resisted portion 2314 of the paper blocking element 231 is placed on the convex portion 2323 and the blocking portion 2324 of the guide element 232 Between them, the convex part 2323 will withstand the resisting part 2314 of the paper stopper 231, and the pin 2312 of the paper stopper 231 will move from the first inclined surface 23321 to the second inclined surface 23322, and then move from the second inclined surface 23322 to The linear portion 2331, so the paper retaining portion 2311 of the paper retaining element 231 can be lowered and inserted into the accommodating groove 271 with precise positioning. The resisted part 2314 of 231 will pass between the convex part 2323 and the blocking part 2324 and return between the convex part 2323 and the sleeve part 2321 (as shown in Figure 4A), so that the paper stop element 231 can return to the paper stop position, and in the next removal Before the paper action starts, it prevents the paper P stacked on the paper feeding tray 24 from entering the paper guide path X, and at the same time has the function of sorting the leading edge of the paper.

In summary, the paper stop mechanism with guide elements and the automatic paper feeding device to which it is applicable in the present invention mainly include guide elements, paper stop elements and guide grooves. When the paper pickup roller approaches the paper supply tray , the guide element linked with the paper pick-up roller through the shaft sleeve will drive the paper stop part of the paper stop to rise and leave the accommodating groove, and drive the latch of the paper stop to move in the guide groove, so that the abutting part is moved by the convex part Between the sleeve and the convex part and the blocking part, a paper is sent to a paper guide path through the paper blocking part, so that the present invention can solve the problem that the paper blocking is not reliable enough, and the supporting point of the paper blocking is inelastic. When picking up paper, it is easy to cause the paper stopper to get stuck, the paper stopper cannot be removed smoothly, and after the paper is taken out, the paper stopper cannot return to the paper stopper position correctly.

The present invention can be modified in various ways by those skilled in the art without departing from the protection scope of the appended claims.

Claims (7)

1. A paper blocking mechanism, suitable for an automatic paper feeding device, the automatic paper feeding device has a paper take-up roller, a cover and a paper feeding tray, the paper blocking mechanism includes: A guide element has a shaft sleeve, an extension arm, a convex portion and a blocking portion, the convex portion is arranged between the blocking portion and the shaft sleeve, and the shaft sleeve is sleeved on the paper-taking roller on one axis of the A paper blocking element is arranged between two adjacent partition walls on the cover of the automatic paper feeding device, and has a paper blocking portion, a pin and a resisting portion, wherein the extending arm of the guiding element is upward abutting against the abutting portion of the paper blocking element, the abutting portion is disposed between the convex portion and the sleeve portion, and the paper blocking portion is inserted into a containing groove; A guide groove is formed on the two partition walls for accommodating the pin of the paper retaining element, has a straight line and a guide, the straight line is set perpendicular to the horizontal line, and its hole diameter is slightly larger than the The width of the plug pin of the paper stop element, the guide part is connected with the straight line part and is inclined towards the direction of the paper pickup roller, and its aperture is larger than the hole diameter of the straight line part, so as to provide the plug pin of the paper stop element in it space to move; An elastic element is arranged adjacent to the straight line portion of the guide groove, and when the pin of the paper stop member is arranged on the straight line portion, it conflicts with the pin, so as to provide a force to the paper stop portion through the pin; Wherein, when the paper pick-up roller approaches the paper supply tray, the guide element linked with the paper pick-up roller through the shaft sleeve will drive the paper stopper of the paper stopper to rise and leave the accommodating slot , and drives the pin of the paper blocking element to move in the guide groove, so that the abutting part spans from between the convex part and the sleeve part to between the convex part and the blocking part, so that a paper can pass through The paper blocking part is sent to a paper guiding path. 2. The paper blocking mechanism as claimed in claim 1, wherein the accommodating groove is disposed on the paper guiding path, and the protrusion is disposed on the top surface of the extension arm separately from the blocking portion. 3. The paper stop mechanism according to claim 1, wherein the paper stop member further comprises a through hole, which is opened at the upper end of the paper stop member, and the abutting portion of the paper stop member is above the through hole A cross bar, and the extension arm of the guide element passes through the through hole of the paper stop element. 4. The paper stop mechanism according to claim 1, wherein the paper stop mechanism further comprises a resisting element, the resisting element is a plate extending inward from the two partition walls, when the paper pickup roller moves toward the supply When the paper tray approaches, a receiving top of the extension arm can touch the abutting element, and using the abutting element as a fulcrum, the extension arm abuts against the abutting part of the paper retaining element and pushes the paper retaining element Lift up. 5. The paper stop mechanism according to claim 1, wherein the guide portion has a first inclined surface and a second inclined surface corresponding to the first inclined surface, the first inclined surface and the second inclined surface The face is inclined towards the direction of the pick-up roller, and when the paper-stopping part of the paper-stopping element rises out of the accommodating groove, the pin of the paper-stopping element moves from the straight line part to the first inclined surface, and along with it As the paper pick-up roller continues to descend, the pin of the paper stop member will be guided by the first inclined surface to make the paper stop member tilt toward the paper pick-up roller, and the abutting portion of the paper stop member will be driven by the Between the convex part and the sleeve part spans to between the convex part and the blocking part. 6. The paper stop mechanism according to claim 5, wherein after the paper pickup roller finishes picking up paper, the paper pickup roller will rise away from the paper supply tray, so that the shaft portion of the paper pickup roller drives the guide The element and the paper stop member descend, and the pin of the paper stop member moves from the first inclined surface to the second inclined surface, and then moves from the second inclined surface to the straight line, so as to guide the The paper blocking part descends and is positioned and inserted in the accommodating slot. 7. An automatic paper feeding device, comprising at least: a cover; a storage tank; a paper feeding tray on which at least one paper is stacked; a pick roller for contacting and feeding the paper on the paper supply tray; and A paper blocking mechanism, used for blocking the paper on the paper feeding tray or allowing the paper to enter a paper guiding path in response to the action of the paper picking roller, the paper blocking mechanism includes: A guide element is arranged between two adjacent partition walls on the cover of the automatic paper feeding device, and has a sleeve part, an extension arm, a convex part and a blocking part, and the convex part is arranged on the Between the blocking portion and the sleeve portion, the sleeve portion is sleeved on a shaft portion of the paper-taking roller; A paper retaining element has a paper retaining portion, a pin and a resisting portion, wherein the extension arm of the guiding element abuts upward against the resisting portion of the paper retaining element, and the resisting portion is arranged on the protrusion Between the part and the sleeve part, the paper blocking part is inserted in the accommodating groove; A guide groove is formed on the two partition walls for accommodating the pin of the paper retaining element, has a straight line and a guide, the straight line is set perpendicular to the horizontal line, and its hole diameter is slightly larger than the The width of the plug pin of the paper stop element, the guide part is connected with the straight line part and is inclined towards the direction of the paper pickup roller, and its aperture is larger than the hole diameter of the straight line part, so as to provide the plug pin of the paper stop element in it space to move; An elastic element is arranged adjacent to the straight line portion of the guide groove, and when the pin of the paper stop member is arranged on the straight line portion, it conflicts with the pin, so as to provide a force to the paper stop portion through the pin; Wherein, when the paper pick-up roller approaches the paper supply tray, the guide element linked with the paper pick-up roller through the shaft sleeve will drive the paper stopper of the paper stopper to rise and leave the accommodating slot , and drives the pin of the paper blocking element to move in the guide groove, so that the abutting portion spans from between the convex portion and the sleeve portion to between the convex portion and the blocking portion, so that the paper passes through The paper stopper is sent to the paper guide path.