JP3622092B2 - Automatic packaging machine bag opening device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bag opening device of an automatic packaging machine which is improved so that a bag for packaging can be opened at a high speed (hereinafter referred to as bag opening) and a product can be packed.
[0002]
[Prior art]
An outline of the automatic packaging machine will be described with reference to FIG. For example, a sheet 3 is rolled out from a raw sheet 1 which is a material for making a bag, such as a vinyl sheet wound in a roll shape, and a necessary print 4 such as a product name or a manufacturer name is printed on the fed sheet 3. Next, a perforation 5 is inserted so that the unit bag can be cut, and then a seal 6 is formed to form the bottom of the bag. And after opening the mouth of the bag and opening the mouth of the bag to pack the product W into the bag and bagging 7, the opening of the bag filled with the product is sealed 8, and the ear 9 is removed. Product 10 is packed in a bag.
[0003]
A conventional bag opening device in the bag opening and bagging 7 of the automatic packaging machine will be described with reference to FIGS. 9 and 10. FIG. As shown in FIG. 10, the bucket 11 has a U-shaped front, and a space formed by facing the two buckets 11 is adapted to the outer shape of the workpiece. Then, as shown in FIG. 9, the two buckets 11 are rotatable around the base end portion O. By opening the bucket 11 from a state where the bucket 11 is closed like 11 ', the bag 11 is opened. The tip of the bucket 11 is inserted into the opening W2 of W1, and the opening W2 of the bag W1 is opened into the shape of the space shown in FIG.
[0004]
Further, an adsorbing device (lower adsorbing device is not shown) 12 that adsorbs and opens the opening W2 of the bag W1 is provided at the position of the opening W2 of the bag W1. Then, the suction device 12 is lowered, and the opening W2 is opened by sucking and lifting the opening W2 of the bag W1 carried in a flat state. Thereafter, by opening the bucket 11 that has been closed so far, the tip of the bucket 11 is inserted into the opened opening W2.
[0005]
Next, the product is packed in the bag W1 opened by the bucket 11. The product is packed by advancing an arm (not shown) to push the product toward the space formed by the bucket 11, and the arm passes between the gaps L2 between the buckets 11 shown in FIG. Is pushed into the bag W1 which is held at the tip of the bag and opened. Then, the arm is continuously advanced, and the bag W1 is pulled out from the tip of the bucket 11 by the pushing force of the arm, and the bag W1 filled with the product is pushed out to the position of the next seal 8 (see FIG. 8). ing.
[0006]
[Problems to be solved by the invention]
In the conventional bag opening device, the step of opening the bag is to first close the bucket 11 so that the bucket 11 does not interfere when the suction device 12 is lowered, and then lowers the suction device 12 to open the opening. W2 adsorbs and rises, then the bucket 11 must be opened and the opening W2 must be opened and held, so there is a problem that this bag opening operation has a time loss and cannot be opened at high speed. is there. Further, when the product is pushed into the opened bag W1, if the bucket 11 is in a closed state, the pushing arm cannot be passed, so that the bucket is closed and the suction device 12 At the stage where the opening W2 is opened, it is necessary to wait for the next product to be pushed in front of the bucket. During this time, there is a loss of time, and the bag cannot be opened and the product cannot be pushed at a high speed. There is a problem.
[0007]
Further, when the suction device 12 sucks the opening W2 and raises the suction device 12 to open the opening W2, the opening W2 must not interfere with the tip of the closed bucket 11 '. As a result, when the bucket 11 is opened, the holding cost L1 of the bucket becomes shallow, and when the product is pushed into the bag W1 at a high speed, the product is not completely pushed into the bag. Since there is a high possibility that W1 will come off, there is a problem that the product cannot be pushed into the bag W1 at a high speed. Further, in order to deepen the holding allowance L1, the bucket 11 must be moved in the direction of the bag W1. For this reason, there are problems that extra steps are required and time is required, and the bag cannot be opened at a high speed.
[0008]
Further, since the bucket itself has a standardized U-shape and the distance between the rotation centers O cannot be adjusted, the bag cannot be opened in accordance with the outer shape of the product. Combined with the shallow holding allowance L1, the resistance when the product is pushed into the bag increases, and the bag is likely to come off from the bucket when the product is pushed into the bag at a high speed. There is a problem that can not be.
[0009]
The present invention provides a bag opening device for an automatic packaging machine capable of opening a bag at a high speed while minimizing time loss during bag opening and bagging.
[0010]
[Means for Solving the Problems]
The means grasped from claim 1 according to the present invention for solving the above-mentioned problems is to open a bag of an automatic packaging machine that adsorbs an opening of a bag by an adsorbing device and raises the adsorbing device to open the opening. An apparatus is provided with rotating claws in two upper and lower stages on both sides of the workpiece conveying surface, a plurality of claws protruding in the rotation direction of the rotating claws, a holding surface is formed on the claws, and the holding surface is in two upper and lower stages. The rotary claw is pivotally supported so as to overlap on the projection plane of the rotary claw provided on the suction claw, and the suction device is provided in the middle of the claw provided on both sides of the workpiece conveying surface .
[0011]
[Action]
Since the present invention is configured as described above, it has the following effects. That is, the action of the means grasped from claim 1 is to provide a plurality of claws protruding in the rotational direction of the rotary claw provided in two upper and lower stages on both sides of the work conveying surface, and by forming a holding surface on the claw, It is possible to lengthen the bag holding allowance when the bag is opened, and by supporting the holding surface so that it overlaps on the projection plane of the rotating claw provided in two upper and lower stages, the bag with a total of four nails Can be held. Furthermore, by providing the suction device in the middle of the claw of the rotary claw provided on both sides of the work conveyance surface, even when the suction device is lowered immediately after carrying out the bag filled with the product, The suction device does not interfere with each claw of each rotary claw.
[0012]
【Example】
An embodiment of the present invention will be described below. First, the outline of the entire packaging apparatus will be described with reference to FIG. The sheet 3 fed from the original fabric 1 in the feeding section 2 is printed with a product name, a manufacturer name, etc. by a printing machine 4, and then sealed with a seal section 6 and then a perforation 5 is put into a bag. The The sheet 3 thus produced is then cut into bags by the cutter 13 and the opening cut by the bucket 14 is opened by the bucket. Then, the product conveyed by the conveyor 15 is pushed into the opened bag by the pusher 151 of the pushing device 15, transferred to the seal portion 8 by the pusher 151, and sealed by the unloading device 16. It is carried out.
[0013]
FIG. 1 is an enlarged view of the bucket portion 14, and the gear box 17 is supported by the slide shaft 18 to be movable, and a nut 21 is attached to the lower end of the gear box 17. The nut 21 is screwed into the right screw 191 and the left screw 192 of the gear box drive shaft 19, and the gear box 17 moves away from each other by turning the handle 22 attached to the end of the gear box drive shaft 19. It is supposed to be. A hollow post 23 is vertically attached to the gear box 17, and an arm 24 is horizontally attached to the upper portion of the post 23.
[0024]
A drive shaft 25 is supported at both ends by bearings 28 and 29 inside the post 23, and a bevel gear 26 is attached to the lower end of the drive shaft 25. The bevel gear 26 meshes with the spline shaft 20 provided through the gear box 17 and the bevel gear 27 that is spline-fitted, and the rotation of the spline shaft 20 is driven via the bevel gears 26 and 27. The drive shaft 25 is rotated by being transmitted to the shaft 25. A bucket shaft 33 is supported by a bearing 32 at the end of the arm 24. Sprockets 30 and 31 are attached to the upper end of the bucket shaft 33 and the upper end of the drive shaft 25, and a timing belt 34 is attached to the sprockets 30 and 31. Has been applied. Reference numeral 35 denotes a tension wheel for tensioning the timing belt 34. Further, the fixing portions 36 of the sprockets 30 and 31 fix the sprockets 30 and 31 to the upper ends of the drive shaft 25 and the bucket shaft 33 in a wedge shape.
[0015]
Rotating claws 37 and 38 are attached to the lower end of the bucket shaft 33 in two upper and lower stages, and the upper rotating claw 37 is movable with respect to the bucket shaft 33. The interval can be adjusted. As shown in FIGS. 4 and 5, the rotary claws 37 and 38 are fixed to the bucket shaft 33 in two upper and lower stages so that the projection planes overlap with each other. ) Projecting claws 371 and 381, and holding surfaces 372 and 382 for holding the bag W1 are formed on the claw 371 and 381, respectively. The holding surfaces 372 and 382 are provided with anti-slip, for example, by forming uneven surfaces or attaching sponge or felt.
[0016]
In FIG. 1, an upper suction port 39 (adsorption device) is provided so as to move up and down in the middle of claws 371 and 381 provided on both sides, and a lower suction port 40 (adsorption device) is provided on the lower side thereof. Is provided. Thereby, the lower side of the flat bag carried in the conveyor 42 is adsorbed by the lower suction port 40, the upper side of the bag is adsorbed by the upper suction port 39, and the upper suction port 39 is raised, The opening of the bag is opened. In addition, as shown in FIG. 5, the distance L3 between the upper suction ports 39 can be changed depending on the size of the bag W1, and the upper suction port 39 is close to the opening W2 of the bag. It is good to arrange in the position.
[0017]
In FIG. 5, the rotary claws 37 and 38 are rotated and the upper suction mouth 39 is positioned in the locus C1 drawn by the claws 371 and 381, but the rotary claws 37 and 38 are provided in two stages so as to overlap on the projection plane. Therefore, the claw 371 and 381 and the upper suction mouth 39 do not interfere with each other in the rotation range L4 (in this embodiment, the claw 371 and 381 has two claw so that the rotation angle is 90 degrees). Therefore, by moving the upper suction port 39 up and down within this rotation range L4, even if the rotating claws 37 and 38 are continuously rotated, there is no interference between them and the upper suction port 39 can be brought closer to the opening W2. Similarly, since the opening W2 of the bag does not interfere with the claws 371 and 381 in the rotation range L4, the insertion length L5 of the claws 371 and 381 can be increased. In this embodiment, the opening W2 is located at the root of the claws 371 and 381.
[0018]
As shown in FIGS. 1 and 2, reference numeral 41 denotes a guide member provided between the rotary claws 37 and 38. The guide member 41 has a U-shape, and its tip is shown in FIG. As shown in FIG. 2, it extends to a position close to the opening W2 of the bag W1. The guide member 41 is selected and replaced according to the outer shape of the product W packed in the bag W1. The position adjustment of the rotary claws 37 and 38 with respect to the guide member 41 is performed as follows. First, with respect to the width direction of the guide member 41, the handle 22 shown in FIG. 1 is turned to move the gear box 17 away and close to change L8 (distance between the drive shafts 25) shown in FIG. The distance L7 between the axes of the rotating claws 37 and 38 shown in FIG. 4 is adjusted, and the width direction length WL1 held and opened by the holding surfaces 372 and 382 of the claws 371 and 381 is adjusted as shown in FIG.
[0019]
The length WL2 in the height direction is adjusted by moving the rotary claw 37 up and down. That is, since the rotary claws 37 and 38 are provided in two stages so as to overlap on the projection plane, the operation of the handle 22 and the movement of the rotary claw 37 in the up and down direction make it possible to open the rectangular opening W2. The sides WL1 and WL2 can be arbitrarily changed.
[0020]
FIG. 6 shows a drive mechanism for driving the upper suction mouth 39. The end of the drive arm 44 is fixed to the base of the suction arm 43 provided with the upper suction mouth 39 at the tip. A connecting rod 45 is pivotally attached to the end. The other end of the connecting rod 45 is rotatably fixed to an arc-shaped long hole 461 provided in the drive member 46. The base end of the drive member 46 is fixed to a drive shaft 49 that is pivotally supported by the bracket 50. As a result, the drive member 46 is swung by the rotation of the drive shaft 49, and the swing of the drive member 46 rotates the drive arm 44 via the connecting rod 45, and the suction arm 43 rotates to rotate the upper suction port. 39 moves up and down.
[0021]
Further, the long hole 461 becomes an arc centering on the connecting portion P between the drive arm 44 and the connecting rod 45 in a state in which the upper suction mouth 39 is in contact with the transport surface 48 (a state in which the suction arm 43 is at its lowest position). Thus, the upper suction mouth 39 is pressed against the conveying surface 48 so that an excessive force is not applied, and even if the suction arm 43 is rotated at a high speed, the upper suction of the bag W1 is ensured, and The mechanism such as the suction arm 43 is prevented from being damaged. In addition, a balancer 47 for balancing the weight of the suction arm 43 is attached to the end of the suction arm 43 so that the inertia force when the suction arm 43 rotates at a high speed is eliminated. Can be rotated at high speed. The suction arm 43 is hollow, and an air nozzle 51 is attached to the suction arm 43. An air hose 52 is connected to the air nozzle 51, and a vacuum pressure (adsorption force) is applied to the upper suction port 39. Is generated.
[0022]
As shown in FIG. 6, since the rotary claw 37 can be changed in height in the vertical direction like 37 ', the upper suction mouth 39 is positioned so as not to interfere with the claw 371 of the rotary claw 37. Must rise to. The range of the vertical movement of the upper mouthpiece 39 is adjusted by the position where the end of the connecting rod 45 is fixed to the long hole 461. For example, in FIG. 6, when the end fixing position of the connecting rod 45 is changed to (A), (B), (C) and the drive member 46 is swung by an angle α, the movement range of the connecting point P is P1, P2 and P3, and the suction arm 43 is rotated at a rotation angle corresponding to the movement of the connecting point P. In addition, if the upper / lower moving range of the upper mouth 39 is too wide, there is a time loss, so that the upper nail 39 can be moved to a minimum height that does not interfere with the claw 371 of the rotary claw 37.
[0023]
That is, since the end attachment position of the connecting rod 45 to the long hole 461 is stepless, the height of the rotary claw 37 is determined in accordance with the outer shape of the product W, and the minimum that does not interfere with the claw 371 of the rotary claw 37 The upper and lower movement range of the upper suction mouth 39 (the rotation range of the suction arm 43) can be determined so that the upper height is limited, and the upper suction mouth 39 moves up and down at high speed without time loss. Can be terminated. Further, even if the position of attaching the end of the connecting rod 45 to the long hole 461 is changed, the long hole 461 is changed to an arc centering on the connecting point P at the position where the upper suction port 39 is lowered most. Since there is no, the upper mouthpiece 39 does not fall any further.
[0024]
Next, the conveyor 42 (see FIG. 1) will be described with reference to FIG. As shown in FIG. 1, the conveyor 42 is provided directly below the rotary claw 38. The timing belt 421 is hung on pulleys 422, 423, 424, and 425, and is provided with a suction conveyance unit 426 and a lower suction port 40. Accordingly, the sheet 3 cut into unit bags by the cutter unit 13 is transferred to the suction conveyance unit 426 and conveyed to the lower suction port 40. Further, a distance of height H is provided between the rotary claw 38 and the lower suction mouth 40. As a result, the claw 381 of the rotary claw 38 can be easily inserted into the opening in which the bag W1 is opened by the lower suction mouth 40 and the upper suction mouth 39.
[0025]
Next, the operation of this embodiment configured as described above will be described. Rotating claws 37 and 38 are provided in two upper and lower stages on both sides of the guide member 41 (work transfer surface), and as shown in FIG. 5, the claws 371 and 381 projecting in the rotational direction (arrow direction) of the rotating claws 37 and 38 By providing a plurality of the nail 371 and 381 and forming the holding surfaces 372 and 382 on the claws 371 and 381, it becomes possible to lengthen the bag holding allowance L5 when the bag is opened, and the holding surfaces 372 and 382 are shown in FIG. Thus, by supporting the bucket shaft 33 so as to overlap on the projection plane of the rotary claws 37 and 38 provided in the upper and lower two stages, it is possible to hold the bag W1 with a total of four claws 371 and 38. Become. Further, by forming a non-slip on the holding surfaces 372 and 382 of the claws 371 and 381, the bag W1 can be easily removed from the holding surfaces 372 and 382 in combination with the longer bag holding allowance L5 of the holding surfaces 372 and 382. It becomes possible not to be.
[0026]
The fixed portion 36 (see FIG. 1) is wedge-shaped, and the drive shaft 25 and the bucket shaft 33 have sprockets 30 and 31 (or only the sprocket 31 only) arbitrarily phased with respect to the claws 371 and 381. Since it can be fixed by shifting, the angle β at which the holding surfaces 372 and 382 hold the bag W1 can be arbitrarily adjusted as shown in FIG. As described above, the rotating claws 371 and 381 are pivotally supported and fixed to the bucket shaft 33 so that the angle β of the holding surfaces 372 and 382 of the claws 371 and 381 can be adjusted when the bag is opened. When the product W is pushed into the bag W1, the bag W1 is prevented from coming off the holding surfaces 372 and 382, and after the product W is packed, the pushing force of the pusher 151 allows the bag W1 to easily come off from the holding surfaces 372 and 382. In addition, the holding force of the holding surfaces 372 and 382 of the claws 371 and 381 can be adjusted.
[0027]
Further, the rotary claw 37 can be moved up and down to adjust the distance between the rotary claw 371 and 381 provided in two upper and lower stages, and the handle 22 in FIG. Since the inter-axis distance L7 of the bucket shaft 33 shown in FIG. 5 can be adjusted and the inter-axis distance of the rotary claws 371 and 381 provided on both sides of the guide member 41 can be adjusted, the rectangular opening side shown in FIG. The length ratio of WL1 and WL2 can be freely adjusted, and the opening W2 of the bag W1 can be opened in a shape that matches the outer shape of the product W.
[0028]
Further, since the claws 371 and 381 are provided in the rotation direction of the rotary claws 37 and 38 in FIG. 5, the tips of the claws 372 and 382 approach each other as shown by the locus C1 drawn by the tips, and the upper mouthpiece 39 ( The leading end enters the opening W2 opened by the suction device) and the lower suction port 40 (suction device), and then rotates in the opening direction to open the opening W2. Since the opening W2 is thus opened, the rectangular opening WL1 in FIG. 4 is strongly stretched between the claws 372 and between the claws 382, and the bag is opened from the upper mouthpiece 39 and the lower mouthpiece 40. The opening W2 of W1 can be peeled off, and the suction force of the upper suction port 39 does not need to be turned on and off. As a result, the opening operation by the upper suction port 39 can be followed at a high speed.
[0029]
【The invention's effect】
The present invention has the following effects.
According to the present invention, a plurality of claws projecting in the rotational direction of the rotary claw provided in two upper and lower stages are provided on both sides of the workpiece conveying surface, and a holding surface is formed on the claw, and the bag holding allowance when the bag is opened is increased. Because it is long, the product can be pushed into the bag at high speed, and the holding surface is pivoted so that it overlaps on the projection plane of the rotary claw provided in two steps, and the bag with a total of four nails Since the holding force of the bag is increased, the product can be pushed into the bag at a high speed. Furthermore, since the suction device is provided in the middle of the claws provided on both sides of the workpiece transfer surface, the suction device and the rotary claws are operated simultaneously immediately after the bag filled with the product is carried out. However, the suction device and each claw of each rotary claw do not interfere with each other. Thereby, immediately after carrying out the bag with which the product was filled, it becomes possible to rotate each rotary nail | claw, moving down an adsorption | suction apparatus, and can reduce cycle time.
[0030]
Further, according to the present invention, the nail holding surface is formed with a non-slip, and the bag holding allowance of the nail holding surface is increased so that the bag cannot be easily removed from the holding surface. The product can be packed at a higher speed.
Further, according to the present invention, the rotating claw is fixed to the bucket shaft so that the angle of the holding surface of the claw can be adjusted when the bag is opened, and the bag does not come off from the holding surface of the claw when the product is pushed into the bag. At the same time, the holding force of the nail holding surface can be adjusted so that the bag can be easily removed from the nail holding surface by the pushing force of the arm after packing the product, so the product can be pushed into the bag at a high speed. Then, the bag can be removed from the holding surface at a high speed without damaging the bag.
Moreover, according to this invention grasped | ascertained from detailed description of the invention based on description of Claim 4, while the distance between the rotary claws provided in the upper and lower two steps can be adjusted, it is on both sides of a workpiece conveyance surface. The distance between the axes of the rotary claw provided is adjustable, and the bag is opened in a shape that conforms to the outer shape of the product, so the resistance when pushing the product into the bag is reduced, the product is deformed and the holding surface The product can be pushed into the bag at a high speed by preventing the bag from coming off.
[Brief description of the drawings]
FIG. 1 is a front view showing a part of an embodiment of the present invention in a longitudinal section.
FIG. 2 is a plan view of a bucket portion in FIG.
FIG. 3 is a side view showing the relationship between the bucket and the conveyor in FIG. 1;
4 is a schematic view showing the bucket in FIG. 1 in a perspective view. FIG.
FIG. 5 is a plan view showing only the bucket in FIG. 1;
6 is a side view showing a drive mechanism for the upper mouthpiece in FIG. 1. FIG.
7 is a side view showing the entire automatic packaging machine to which the embodiment in FIG. 1 is applied. FIG.
FIG. 8 is an explanatory view schematically showing the automatic packaging apparatus.
FIG. 9 is a schematic view of a conventional bucket.
10 is a front view of FIG. 9;
[Explanation of sign]
17 Gearbox, 18 Slide shaft, 19 Gearbox drive shaft, 191 Right-hand thread, 192 Left-hand thread, 20 Spline shaft, 21 Nut, 22 Handle, 23 Post, 24 Arm, 25 Drive shaft, 26 Bevel gear, 27 Bevel gear, 38 bearings, 29 bearings, 30 sprockets, 31 sprockets, 32 bearings, 33 bucket shafts, 34 timing belts, 35 tensioning wheels, 36 fixed parts, 37 rotating claws, 371 claws, 372 holding surfaces, 38 rotating claws, 381 claws, 382 Holding surface, 39 Upper suction port (Suction device) , 40 Lower suction port (Suction device) , 41 Guide member, 42 Conveyor, 43 Suction arm, 44 Drive arm, 45 Connecting rod, 46 Drive member, 47 Balancer, 48 Transport surface 461 Long hole 49 Drive shaft 50 Bracket 51 Air nozzle 52 Air hose

Claims (1)

A bag opening device for an automatic packaging machine that sucks an opening of a bag by a suction device and raises the suction device to open the opening . A plurality of claws projecting in the rotation direction of the rotating claw are provided, a holding surface is formed on the claw, and the rotating claw is pivotally supported so that the holding surface overlaps on a projection plane of the rotating claw provided in two upper and lower stages. A bag opening device for an automatic packaging machine , wherein the suction device is provided in the middle of the claws provided on both sides of the workpiece conveying surface .

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