JP6810964B2 - Flap folding device - Google Patents

Description

The present invention relates to a flap folding device that bends a flap formed by a film wrapping an object to be packaged extending in the direction opposite to the transport direction of the object to be packaged and the film to the lower surface of the object to be packaged.

Patent Document 1 discloses a packaging device for packaging an object to be packaged with a stretchable film. The reference numerals used in Patent Document 1 are written in parentheses, and the packaging device described in Patent Document 1 will be described. In the technique described in Patent Document 1, a plurality of objects to be packaged (A) are arranged in a tubular film (F) in the longitudinal direction of the film (F), and the objects to be packaged (A) are arranged from both sides. It is sandwiched by side belts (10, 11) and conveyed. Each time the object to be packaged (A) passes through the guillotine (13) and the cutting blade (12), the film (F) is cut by the guillotine (13) and the cutting blade (12). As a result, the portion of the film (F) between the adjacent objects to be packaged (A) is divided into two flaps (F1, F2). Then, after the flap (F1) on the upstream side is sucked into the suction chamber (14), the packaged object (A) is transported, so that the flap (F1) is folded on the lower surface of the packaged object (A). .. On the other hand, after the upstream flap (F1) is folded, the downstream flap (F2) is sucked into the suction chamber (15). After that, a plurality of rollers (17) moving at a higher speed than the packaged object (A) pass under the packaged object (A), so that the flap (F2) on the downstream side is moved to the lower surface of the packaged object (A). Folds in. These rollers (17) are towed by a pair of left and right endless chains (24).

Jitsufuku No. 5-32402

However, in the technique described in Patent Document 1, since the roller (17) is in sliding contact with the lower surface of the packaged object (A), the flap (F1) on the opposite side folded after the previous cutting is pulled by the roller (17). There is a risk that it will be peeled off.

Therefore, the present invention has been made in view of the above circumstances. An object to be solved by the present invention is to prevent the flap on the opposite side from peeling off from the lower surface of the packaged object when the flap is folded.

In order to solve the above problems, a flap formed by a film wrapped with an object to be packaged extending in the direction opposite to the transport direction of the object to be packaged and the film is bent under the object to be packaged. The folding device is provided in a state of being directed upward under the transport path of the object to be packaged, and the suction nozzle for sucking the flap and the suction nozzle under the transport path of the packaged object and above the suction nozzle. The endless member provided in an endless shape so as to extend in the transport direction of the packaged object, and the endless member in the same direction as the transport direction of the packaged object at a speed higher than the transport speed of the packaged object. A drive unit that drives the member and a drive unit that is attached to the endless member so as to be arranged in the circumferential direction of the endless member in a part of the entire circumference of the endless member, and is mounted on the suction nozzle by driving the endless member. A direction in which the endless member is driven by the drive portion in a plurality of shutter portions that close the suction nozzle when passing through the above and a section of the entire circumference of the endless member in which the plurality of shutter portions are not arranged. The flap attached to the endless member and sucked by the suction nozzle is attached to the endless member at a position away from the rear end of the arrangement of the plurality of shutter parts when the above is in front of the arrangement of the plurality of shutter parts. A pressing member that presses against the lower surface of the object to be packaged by driving the endless member is provided, and the plurality of shutter portions are located inside the pressing member in the circumferential direction of the endless member.
Regarding the front-back orientation of the arrangement of the plurality of shutter units, the direction in which the endless member is driven by the driving unit is the front side of the arrangement of the plurality of shutter units, and the direction opposite to the direction in which the endless member is driven by the driving unit is Behind the array of multiple shutters.

According to the above, since the plurality of shutter portions are located inside the pressing member, the shutter portions move downward from the lower surface of the object to be packaged and pass in the transport direction. Therefore, when the flap is folded by the pressing member, it is possible to prevent the flap on the opposite side from being peeled off from the lower surface of the packaged object by the shutter portion.
Further, when a plurality of shutter portions pass over the suction nozzles, the suction nozzles are blocked by these shutter portions. Therefore, when the object to be packaged passes over the suction nozzle, it is possible to prevent the object to be packaged and the flap folded therein from being drawn into the suction nozzle.

Further, the flap folding device for bending the flap formed by the film wrapping the object to be packaged extending in the direction opposite to the transport direction of the object to be packaged and the film to be packaged is the packaged object. A suction nozzle that is provided in a state of being directed upward under the transport path of the object and sucks the flap, and in the transport direction of the packaged object under the transport path of the packaged object and above the suction nozzle. An endless member provided so as to extend and an endless member, and a drive unit that drives the endless member in the same direction as the transport direction of the packaged object at a speed higher than the transport speed of the packaged object. A flexible shutter that is provided in the circumferential direction of the endless member in a part of the entire circumference of the endless member and closes the suction nozzle when passing over the suction nozzle by driving the endless member. After the shutter portion when the direction in which the endless member is driven by the driving portion is in front of the shutter portion in the section of the entire circumference of the endless member and the section where the shutter portion is not provided. A pressing member attached to the endless member at a position away from the end and pressing the flap sucked by the suction nozzle against the lower surface of the packaged object by driving the endless member. The shutter portion is located inside the pressing member in the circumferential direction of the endless member.
Regarding the front-rear direction of the shutter unit, the direction in which the endless member is driven by the drive unit is the front side of the shutter unit, and the direction opposite to the direction in which the endless member is driven by the drive unit is the rear side of the shutter unit.

According to the embodiment of the present invention, when the flap is folded by the pressing member, it is possible to prevent the flap on the opposite side from being peeled off by the shutter portion.

It is a perspective view of the packaging device. It is a side view of the side belt of a packaging device, a cutting machine, a first flap bending device, and a second flap bending device. It is sectional drawing in the cut plane of III-III shown in FIG. It is sectional drawing in the cut plane of IV-IV shown in FIG. It is sectional drawing in the cut plane of VV shown in FIG. It is a side view which showed the state before cutting a film. It is a side view which showed the state when the film was cut. It is a side view which showed the state after cutting a film. FIG. 5 is a side view showing a state in which the cut rear end flap is sandwiched between the rear end of the lower surface of the object to be packaged and the pressing member. It is a side view which showed the state which the cut rear end flap is folded under the lower surface of the packaged object. It is a side view which showed the state which the pressing member returns to the upstream side. It is a side view which showed the 1st example of the shape of a shutter plate. It is a side view which showed the 2nd example of the shape of a shutter plate. It is a side view which showed the 3rd example of the shape of a shutter plate. It is a side view which showed the 4th example of the shape of a shutter plate. It is a side view which showed the 5th example of the shape of a shutter plate. It is a side view of the side belt of the packaging device of a modification, a cutting machine, a first flap bending device, and a second flap bending device. It is a side view of the side belt of the packaging device of a modification, a cutting machine, a first flap bending device, and a second flap bending device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are provided with various technically preferable limitations for carrying out the present invention, and thus the scope of the present invention is not limited to the following embodiments and illustrated examples.

1. 1. Outline of the Packaging Device FIG. 1 is a perspective view of the packaging device 10. FIG. 2 is a side view of the side belt 14 of the packaging device 10, the cutting machine 40, the first flap bending device 50, and the second flap bending device 60. FIG. 3 is a cross-sectional view of the cut surface of III-III shown in FIG. FIG. 4 is a cross-sectional view of the cut surface of IV-IV shown in FIG. FIG. 5 is a cross-sectional view of the cut surface of VV shown in FIG.

As shown in FIG. 1, the wrapping device 10 is a stretch wrapping machine that sequentially manufactures a package 4 by sequentially overwrapping and wrapping a plurality of objects 1 to be packaged. That is, the packaging device 10 covers the film 5 with the film 5 by wrapping the object to be packaged 1 from above with the film 5 while pulling both sides of the stretchable strip-shaped film 5 to form the film 5 into a tubular shape. Wrap the package 1. The packaged object 1 is composed of a tray 2 and one or more articles 3 placed on the tray 2.

The packaging device 10 includes a supply conveyor 11, a conveyor 12, a sandwiching conveyor 13, a discharge conveyor 17, one support roller 20, one feed roller 21, a guide roller 22, and two first tension rollers 23. Two pinch rollers 24, two second tension rollers 25, two upper endless belts 26, two lower endless belts 27, two forming belts 31, pressure rollers 34, cutting machine 40, It includes a first flap bending device 50 and a second flap bending device 60.

2. 2. Conveyance of Items to be Packaged A supply conveyor 11 is provided on the upstream side of the conveyor 12. The transfer machine 12 is provided on the upstream side of the sandwich transfer machine 13. The sandwiching conveyor 13 is provided on the upstream side of the discharge conveyor 17. The transport direction of the packaged object 1 by the supply conveyor 11, the conveyor 12, the sandwiching conveyor 13, and the discharge conveyor 17 is from the back to the front, the upstream side means the rear side, and the downstream side means the front side. Say that. Further, the transport path of the object to be packaged 1 by the supply conveyor 11, the conveyor 12, the sandwiching conveyor 13, and the discharge conveyor 17 extends in the front-rear direction. Further, the left-right direction means a horizontal direction orthogonal to the transport direction.

The supply conveyor 11 transports a plurality of objects to be packaged 1 arranged at intervals in the front-rear direction forward, and sequentially supplies the objects to be packaged 1 to the transfer machine 12. The supply conveyor 11 is a pusher conveyor or a belt conveyor. A belt conveyor is a conveyor that conveys an object to be packaged 1 on the belt by rotating an endless belt with a motor or the like. A pusher conveyor is a conveyor that pushes and transfers an object to be packaged 1 on a support surface by a pushing member provided on the towing member at regular intervals by rotating an endless towing member (belt, chain, etc.) with a motor or the like. Is. The pusher conveyor is also referred to as a finger conveyor, and the pushing member is also referred to as a finger.

The conveyor 12 is a belt conveyor. The transporter 12 transports the objects to be packaged 1 supplied by the supply conveyor 11 forward, sandwiches the objects to be packaged 1, and sequentially supplies the objects to be packaged 1 to the transporter 13.

The sandwiching carrier 13 sandwiches the object to be packaged 1 from both sides of the object to be packaged 1 conveyed by the carrier 12 by a pair of endless side belts 14, and conveys the object to be packaged 1 forward by the side belts 14. It is a conveyor. The sandwiching carrier 13 includes a pair of side belts 14, a pair of upstream pulleys 15, a pair of downstream pulleys 16, a motor, and the like. The pair of upstream pulleys 15 are arranged side by side at intervals on the left and right. The pair of downstream pulleys 16 are arranged side by side at a position separated from the upstream pulley 15 in the front direction. The side belt 14 is hung on the pulleys 15 and 16. The motor rotates and drives the upstream pulley 15 or the downstream pulley 16.

When the object to be packaged 1 is transported by the transfer machine 12 and the sandwiching transfer machine 13, the object to be packaged 1 is individually wrapped. The completed package 4 is delivered from the sandwiching conveyor 13 to the discharge conveyor 17. The discharge conveyor 17 transports the package 4 conveyed by the sandwiching conveyor 13 forward.

During the operation of the packaging device 10, the supply conveyor 11 and the discharge conveyor 17 are always in operation. The transfer speed of the supply conveyor 11 is lower than the transfer speed of the transfer machine 12 and the sandwiching transfer machine 13. Both the transfer machine 12 and the sandwich transfer machine 13 stop at the same time and intermittently. The stop of the transfer machine 12 and the sandwiching transfer machine 13 is synchronized with the timing immediately before the cutting operation of the cutting machine 40 described later. When the object to be packaged 1 conveyed by the supply conveyor 11 passes through a predetermined position (a position slightly upstream from the downstream end of the supply conveyor 11), a sensor detects this, and the conveyor is stopped. 12 and the sandwiching conveyor 13 start to operate, and at the same time, the cutting operation of the cutting machine 40 starts.

3. 3. Film transport and wrapping Rollers 20 and 21 parallel to each other on the left and right are arranged in parallel on the front and back above the transporter 12. The original roll 8 is placed on the rollers 20 and 21, and the rollers 20 and 21 are circumscribed on the original roll 8. The original roll 8 is made by winding a stretchable film 5 into a roll shape. During the operation of the packaging device 10, the film 5 is continuously pulled out from the original roll 8.

Two guide rollers 22 are provided behind the original roll 8 in a state of being arranged in parallel in the front-rear direction. The axes of the original roll 8 and the guide roller 22 are parallel to each other and extend to the left and right. The film 5 unwound from the original roll 8 is hung on the guide roller 22 and guided by the guide roller 22.

Below the guide roller 22 on the rear side, a pair of first tension rollers 23 and a pair of pinch rollers 24 are rotatably provided in a state of being arranged side by side on the left and right sides. The pinch roller 24 comes into contact with the back of the first tension roller 23. Both side portions of the film 5 guided downward from the guide roller 22 on the rear side are sandwiched between the first tension roller 23 and the pinch roller 24. The film 5 is pulled in the width direction by hanging both side portions of the film 5 on the first tensioning roller 23.

Below the first tension roller 23, a pair of second tension rollers 25 are rotatably provided in a state of being arranged side by side on the left and right sides. Both side portions of the film 5 guided downward from the first tension roller 23 are folded forward by being hung on the second tension roller 25.

A pair of upper endless belts 26 and a pair of lower endless belts 27 are provided on the front side of the second tension roller 25 in a state of being arranged side by side. The lower endless belt 27 comes into contact with the lower endless belt 26. The upper endless belt 26 and the lower endless belt 27 incline downward toward the front, but the rear ends of the upper endless belt 26 and the lower endless belt 27 are located above the transport surface of the conveyor 12 and are on the upper side. The front ends of the endless belt 26 and the lower endless belt 27 are located below the transport surface of the conveyor 12. Both side portions of the film 5 guided forward from the second tension roller 25 are sandwiched between the upper endless belt 26 and the lower endless belt 27.

The conveyor 12 is provided between the left endless belts 26 and 27 and the right endless belts 26 and 27. Therefore, when the object to be packaged 1 is carried between the left endless belts 26 and 27 and the right endless belts 26 and 27 by the carrier 12, the packaged object 1 is transferred to the film 5 in the middle of the endless belts 26 and 27. Covered from above. Then, the object to be packaged 1 is transported forward together with the film 5 by the transport machine 12, and both side portions of the film 5 are moved forward by the endless belts 26 and 27 and descend to below the lower surface of the object to be packaged 1. As a result, the object to be packaged 1 is covered with the film 5. The object to be packaged 1 covered with the film 5 is delivered from the transfer machine 12 to the sandwiching transfer machine 13. The object to be packaged 1 is sandwiched by the sandwiching carrier 13 together with the film 5 and transported forward. The film 5 is pulled out from the original roll 8 by the object to be packaged 1 and the film 5 covering the object to be packaged being conveyed by the sandwiching and conveying machine 13. The film 5 may be pulled out by driving any one or more of the endless belts 26 and 27 and the rollers 20 to 25 by a motor.

4. Forming a film in a tubular shape The film 5 covering the object to be packaged 1 is formed in a tubular shape by a pair of left and right endless forming belts 31 provided in front of the endless belts 26 and 27. The forming belt 31 is arranged side by side on the left and right. The distance between the left and right forming belts 31 gradually decreases toward the front. Then, the folded ends behind the forming belt 31 are arranged at intervals between them, and the folded ends in front of the forming belt 31 come into contact with each other. The endless belts 26 and 27 are arranged below the rear portion of the sandwiching carrier 13.

Both side portions of the film 5 sandwiched between the endless belts 26 and 27 are guided between the front ends of the endless belts 26 and 27 and the forming belt 31. When the film 5 is conveyed forward together with the object to be packaged by the sandwiching carrier 13, both side portions of the film 5 are caught under the lower surface of the object to be packaged 1. As a result, the film 5 is formed into a tubular shape.

Then, both side portions of the film 5 are sandwiched from the left and right by the downstream pulley 33 on which the forming belt 31 is hung, and further sandwiched from the left and right by the pressure roller 34 on the downstream side. As a result, both sides of the film 5 are pressurized and adhered by the self-adhesive force or the electrostatic force of the film 5. A heater may be built in the downstream pulley 33 and the pressure roller 34, and both side portions of the film 5 may be heat-sealed by the downstream pulley 33 and the pressure roller 34.

5. Cutting the film The film 5 formed in a tubular shape as described above is guided further forward (downstream side) from the pressure roller 34. A cutting machine 40 is provided in front of the pressurizing roller 34. Every time the film 5 is conveyed by a predetermined distance, that is, every time the object to be packaged 1 passes through the cutting machine 40, the film 5 is cut by the cutting machine 40.

As shown in FIGS. 1 and 2, the cutting machine 40 includes a cutter blade 41, a blade receiver 42, and a drive mechanism 43. The cutter blade 41 is provided so as to be able to move up and down by a linear guide below the gap between the left and right side belts 14. The blade receiver 42 is provided so as to be able to move up and down by a linear guide below the space between the left and right side belts 14. The drive mechanism 43 drives the cutter blade 41 and the blade receiver 42 so that the cutter blade 41 and the blade receiver 42 are brought into contact with each other in the vertical direction. The cutter blade 41 may be provided so as to be able to move up and down above the gap between the left and right side belts 14, and the blade receiver 42 may be provided so as to be able to move up and down below the space between the left and right side belts 14.

The operation order of the cutting machine 40, the conveying machine 12, and the sandwiching conveying machine 13 is as follows (see FIGS. 6 to 11). Here, the operation order of the cutting machine 40 and the flap bending devices 50 and 60 described later is shown in the order of FIGS. 6 to 11.

As shown in FIG. 6, after the object to be packaged 1 has passed through the space between the cutter blade 41 and the blade receiver 42, and before the next object to be packaged 1 has passed through the cutting machine 40, the carrier 12 And the sandwiching carrier 13 is temporarily stopped. At this time, the cutter blade 41 of the cutting machine 40 and the blade receiver 42 are separated in the vertical direction, and the space between the cutter blade 41 and the blade receiver 42 from the object to be packaged 1 through which the tubular film 5 has passed. It extends backwards through.

After that, the temporary stop of the transfer machine 12 and the sandwiching transfer machine 13 is completed, and the packaged object 1 is conveyed. Almost at the same time as the resumption of transportation of the packaged object 1, the drive mechanism 43 raises the cutter blade 41 and lowers the blade receiver 42 as shown in FIG. Then, the cutter blade 41 and the blade receiver 42 mesh with each other, and the film 5 is cut. Here, FIG. 7 shows a state when the film 5 is cut by the cutter blade 41 and the blade receiver 42, and FIG. 8 shows a state immediately after cutting.

After that, the drive mechanism 43 lowers the cutter blade 41 and raises the blade receiver 42 (see FIG. 9). After the cutter blade 41 and the blade receiver 42 are separated from each other, the drive mechanism 43 is temporarily stopped until the next object to be packaged 1 passes between the cutter blade 41 and the blade receiver 42 downstream (FIGS. 10 and 10). 11). The above operation is repeated.

When the film 5 is cut as described above, the portion of the film 5 between the packaged object 1 on the upstream side and the packaged object 1 on the downstream side of the cutting machine 40 becomes two flaps 6 and 7. It can be carved. Here, the flap 6 extending forward (downstream) from the packaged object 1 on the upstream side is referred to as a front end flap 6, and the flap 7 extending rearward (upstream) from the packaged object 1 on the downstream side is referred to as a rear end flap. It is called 7. The flaps 6 and 7 are also referred to as the ears.

The front end flap 6 extending from the object to be packaged 1 on the downstream side was cut in the previous cutting step. The front end flap 6 is already folded by the first flap bending device 50 described later.

6. Bending the front end flaps After the film 5 is cut by the cutting machine 40 as described above, the front end flaps 6 are placed under the packaged object 1 by the first flap folding device 50 as shown in FIGS. 8 to 11. It is folded and stacked on the lower surface of the object to be packaged 1.

As shown in FIGS. 1 and 2, the first flap bending device 50 includes a suction nozzle 51, a tacking member 52, and a support roller 53. The tacking member 52 is also referred to as a pressing member.

The support roller 53 extends in the left-right direction at a position between the pressure roller 34 and the cutter blade 41 and is rotatably provided. The support roller 53 is arranged at a position below the side belt 14.

The suction nozzle 51 is provided at a position downstream of the support roller 53 and upstream of the cutter blade 41. Further, the suction nozzle 51 is arranged below the space between the left and right side belts 14, and the suction port provided at the upper end of the suction nozzle 51 is directed upward. The suction port at the upper end of the suction nozzle 51 is arranged at a position immediately in front of the support roller 53. The base end side of the suction nozzle 51 is connected to the vacuum, and the vacuum sucks air from the suction nozzle 51 to generate a negative pressure in the suction nozzle 51. Since the vacuum is always in operation during the operation of the packaging device 10, the negative pressure of the suction nozzle 51 is always generated.

The tacking member 52 is a thin plate-shaped member. The tacking member 52 is installed so that the plate thickness direction on the lower end side thereof is the front-rear direction. The tacking member 52 is erected at a position downstream of the suction nozzle 51 and the cutter blade 41. Further, the tacking member 52 is arranged below the space between the left and right side belts 14, and the upper end of the tacking member 52 is substantially aligned with the height of the support roller 53. The upper portion of the tacking member 52 is bent forward to form a round surface.

The folding of the front end flap 6 by the first flap folding device 50 will be described below.
As described above, when the film 5 is cut by the cutting machine 40 (see FIG. 7), the front end flap 6 extending forward from the packaged object 1 on the upstream side is pulled into the suction nozzle 51, so that the front end The flap 6 is bent around the support roller 53 as a fulcrum (see FIG. 8). After that, when the object to be packaged 1 approaches the suction nozzle 51, the pull-in amount of the front end flap 6 increases (see FIG. 9). After that, when the front end of the object to be packaged 1 reaches the top of the tacking member 52, the front end flap 6 is sandwiched between the front end of the lower surface of the object to be packaged 1 and the tacking member 52 (see FIG. 10). Then, when the object to be packaged 1 passes over the tacking member 52, the front end flap 6 is pressed against the lower surface of the object to be packaged 1 while sliding against the tacking member 52 (see FIGS. 10 and 11). Therefore, the front end flap 6 is stretched rearward from the front end of the packaged object 1 along the lower surface of the packaged object 1 and overlapped with the lower surface of the packaged object 1.

When the object to be packaged 1 passes over the suction nozzle 51 on the downstream side, the object to be packaged 1 is supported by the support roller 53 (FIGS. 10 and 11). Therefore, the object to be packaged 1 is prevented from being pulled down by the suction nozzle 51.

In FIGS. 6 to 11, in order to facilitate understanding of the folded state of the front end flap 6, the lower surface of the object to be packaged 1 is shown so as to be separated from the inner surface of the tubular film 5. ing. Actually, the lower surface of the object to be packaged 1 is in contact with the inner surface of the tubular film 5.

7. Bending the rear end flap After the film 5 is cut by the cutting machine 40 as described above, the rear end flap 7 is bent under the packaged object 1 by the second flap bending device 60 as shown in FIGS. 8 to 11. It is stacked on the lower surface of the object to be packaged 1.

As shown in FIGS. 2 to 5, the second flap bending device 60 includes a drive mechanism 43, two endless belts 62, two drive pulleys 63, two driven pulleys 64, and two tension pulleys 65. , A plurality of shutter plates 66, support rollers 71, tacking rollers 81 to 83, suction nozzle 90, and the like. The tacking rollers 81 to 83 are also referred to as a pressing roller or a pressing member.

The suction nozzle 90 is arranged on the downstream side of the tacking member 52 of the first flap bending device 50. Further, the suction nozzle 90 is arranged below the space between the left and right side belts 14. That is, the suction nozzle 90 is arranged below the transport path of the packaged object 1. The suction nozzle 90 is provided in a state in which the suction port provided at the upper end of the suction nozzle 90 is directed upward. The base end side of the suction nozzle 90 is connected to the vacuum, and the vacuum sucks air from the suction nozzle 90 to generate a negative pressure in the suction nozzle 90. Since the vacuum is always in operation during the operation of the packaging device 10, the negative pressure of the suction nozzle 90 is also constantly generated.

The two driven pulleys 64 are arranged side by side so as to be coaxial with each other, and are rotatably supported by the machine frame of the packaging device 10. The driven pulley 64 is arranged on the downstream side of the tacking member 52 of the first flap bending device 50. The driven pulley 64 is arranged at a position below the upper end of the tacking member 52. The suction port at the upper end of the suction nozzle 90 is arranged between the left and right driven pulleys 64, and is arranged slightly downstream from the central axis of the driven pulley 64.

The two drive pulleys 63 are fixed to a common rotating shaft 63a, and the rotating shaft 63a is rotatably supported by a bearing or the like on the machine frame of the packaging device 10. The drive pulley 63 is arranged at a position downstream of the driven pulley 64. The rotary shaft 63a is connected to the drive mechanism 43 via a transmission mechanism, and the drive pulley 63 is rotationally driven by the drive mechanism 43. The drive mechanism 43 is intermittently paused. The stop timing of the drive mechanism 43 is synchronized with the stop timing of the transfer machine 12 and the sandwich transfer machine 13. Here, the drive mechanism 43 is a power source common to the second flap bending device 60 and the cutting machine 40, but the drive pulley 63 may be rotationally driven by a motor independent of the drive mechanism 43.

The two tension pulleys 65 are rotatably supported by a common support shaft 65a by bearings, and the support shaft 65a is fixed to the machine frame. Therefore, even if the tension pulley 65 rotates, the support shaft 65a does not rotate.

The tension pulley 65 is arranged at a position diagonally below the downstream side of the driven pulley 64. The tension pulley 65 is arranged at a position upstream of the drive pulley 63.
These pulleys 63 to 65 are metal toothed pulleys.

The endless belt 62 is a toothed timing belt made of rubber or synthetic resin. An endless belt 62 is hung on these pulleys 63 to 65. The portion of the endless belt 62 that is hung from the driven pulley 64 to the drive pulley 63 becomes horizontal and extends in the front-rear direction. The endless belt 62 is driven in the direction from the driven pulley 64 toward the drive pulley 63. The portion of the endless belt 62 that is hung from the driven pulley 64 to the drive pulley 63 moves from upstream to downstream at a speed faster than that of the side belt 14 of the sandwiching carrier 13.

The suction port at the upper end of the suction nozzle 90 is arranged between the left and right endless belts 62, and is arranged slightly below the portion of the endless belt 62 that is hung from the driven pulley 64 to the drive pulley 63. Has been done. Therefore, the portion of the endless belt 62 that is hung from the driven pulley 64 to the drive pulley 63 extends in the transport direction of the packaged object 1 under the transport path of the packaged object 1 and above the suction nozzle 90.

The endless belt 62 is provided with tacking rollers 81 to 83 made of synthetic resin or metal, a plurality of shutter plates 66 made of synthetic resin or metal, and support rollers 71 made of synthetic resin or metal at predetermined intervals in the circumferential direction. Has been done.

The plurality of shutter plates 66 are erected between the left and right endless belts 62, and are arranged at regular intervals in the circumferential direction in a part of the entire circumference of the endless belts 62 (see FIG. 2). The pitch of these shutter plates 66 may be zero. Further, the adjacent shutter plates 66 may partially overlap and partially overlap.

Several examples of the shape of the shutter plate 66 are shown in FIGS. 12 to 16. In the case shown in FIG. 12, the central portion 66a in the front-rear direction of the shutter plate 66 is parallel to the endless belt 62, and the front portion 66b and the rear portion 66c are inclined toward the endless belt 62 side. In the case shown in FIG. 13, the shutter plate 66 is provided in a valley fold, and the front portion 66d and the rear portion 66e are inclined toward the endless belt 62 side. In the case shown in FIG. 14, the shutter plate 66 is provided in an L shape, and the front portion 66f is parallel to the endless belt 62. The rear portion 66g is bent vertically from the rear end of the front portion 66f toward the endless belt 62. In the case shown in FIG. 15, the shutter plate 66 is provided in a U-shape or a U-shape, the central portion 66h in the front-rear direction of the shutter plate 66 is parallel to the endless belt 62, and the front portion 66i and the rear portion 66j are endless belts. It is bent vertically toward 62. In the case shown in FIG. 16, the rear portion 66m is parallel to the endless belt 62, and the front portion 66n is inclined toward the endless belt 62 side. Here, the front portion 66n of the shutter plate 66 overlaps the rear portion 66m of the shutter plate 66 adjacent to the front portion 66n.

As shown in FIGS. 2 to 5, the support rollers 71 and the tacking rollers 81 to 83 are erected between the left and right endless belts 62. Further, the support rollers 71 and the tacking rollers 81 to 83 are attached to the endless belt 62 so as to be arranged in the circumferential direction of the endless belt 62 in the section where the plurality of shutter plates 66 are not arranged.

Here, the support roller 71 is adjacent to the rear end of the array of shutter plates 66. The tacking roller 83 is adjacent in front of the head of the array of shutter plates 66. The tacking roller 82 is adjacent in front of the tacking roller 83. The tacking roller 81 is adjacent in front of the tacking roller 82. The tacking rollers 81 to 83 are arranged at regular intervals in the circumferential direction of the endless belt 62. The support roller 71 is separated from the tacking roller 81 in front, and the distance between the tacking roller 81 and the support roller 71 is the pitch of the shutter plate 66, the pitch of the tacking rollers 81 to 83, and the support roller 71 and the rearmost shutter plate. The spacing between 66 is wider than the spacing between the trailing tacking roller 83 and the leading shutter plate 66. Therefore, the head of the row of these tacking rollers 81 to 83, the shutter plate 66, and the support roller 71 is the tacking roller 81, and the end is the support roller 71, and between the tacking roller 81 and the support roller 71, There is a blank section 80.

The shutter plate 66 is located inside the tacking rollers 81 to 83 and the support rollers 71 with respect to the circumferential direction of the endless belt 62. Therefore, the trajectory drawn when the tacking rollers 81 to 83 and the support roller 71 move from the driven pulley 64 toward the drive pulley 63 is the trajectory drawn when the shutter plate 66 moves from the driven pulley 64 toward the drive pulley 63. Is above. The tacking rollers 81 to 83 and the support rollers 71 draw the same locus.

As shown in FIG. 3, the left and right ends of the shutter plate 66 are attached to the outer peripheral surfaces of the left and right endless belts 62 by a fastener 67 made of synthetic resin.

The fixture 67 is attached to the endless belt 62 as follows. The fixture 67 holds the endless belt 62 so as to straddle the outer peripheral surface of the endless belt 62 in the width direction of the endless belt 62. The left and right side portions of the fixture 67 extend to the side of the endless belt 62 from the outer peripheral surface side to the inner peripheral surface side of the endless belt 62, and the claws 68 formed on the inside of these side portions are inside the endless belt 62. It is caught on the peripheral surface (especially between adjacent teeth).

The left and right ends of the shutter plate 66 are fastened by screws 69 to a portion of the fixture 67 that straddles the outer peripheral surface of the endless belt 62. There is play in the direction along their contact surfaces between the shutter plate 66 and the fixture 67. That is, the shaft portion of the screw 69 is passed through the through hole 66z formed in the shutter plate 66, but the through hole 66z has a larger diameter than the shaft portion of the screw 69 and is larger than the head portion of the screw 69. It has a small diameter. A member having an elastomeric property may be provided between the outer peripheral surface of the screw 69 and the inner peripheral surface of the through hole 66z.

If the left and right endless belts 62 are stretched due to aged deterioration or the like, the fixtures 67 on the left and right of the shutter plate 66 may be displaced in the circumferential direction. Even in such a case, since there is play between the shutter plate 66 and the fixture 67, loosening of the screw 69 is suppressed even if the shutter plate 66 is in an oblique posture with respect to the left-right direction.

The fastening force of the screw 69 is such that the shutter plate 66 does not rattle even if there is play between the outer peripheral surface of the screw 69 and the inner peripheral surface of the through hole 66z. Therefore, no rattle noise is generated when the endless belt 62 is driven.

As shown in FIG. 4, the left and right ends of the support roller 71 are attached to the outer peripheral surfaces of the left and right endless belts 62 by a metal attachment 72 and a metal shaft member 75. The fixture 72 is attached to the endless belt 62 in the same way that the fixture 67 is attached to the endless belt 62. That is, the fixture 72 holds the endless belt 62 so as to straddle the outer peripheral surface of the endless belt 62 in the width direction of the endless belt 62. The left and right side portions of the fixture 72 extend to the side of the endless belt 62 from the outer peripheral surface side to the inner peripheral surface side of the endless belt 62, and the claws 73 formed inside these side portions are inside the endless belt 62. It is caught on the peripheral surface (especially between adjacent teeth).

The shaft member 75 is fastened to a portion of the fixture 72 that straddles the outer peripheral surface of the endless belt 62 by a screw 76. There is almost no play between the shaft member 75 and the fixture 72.
The left and right ends of the support roller 71 are rotatably supported by the left and right shaft members 75.

As described above, the shutter plate 66 is attached to the outer peripheral surface of the endless belt 62 via the attachment 67, whereas the support roller 71 is attached to the outer periphery of the endless belt 62 via the attachment 72 and the shaft member 75. It is attached to the surface. Therefore, as described above, the support roller 71 is located outside the shutter plate 66 in the circumferential direction of the endless belt 62.

The tacking roller 81 is attached to the endless belt 62 by the attachment and the shaft member in the same way that the support roller 71 is attached to the endless belt 62 by the attachment 72 and the shaft member 75. The same applies to the tacking rollers 82 to 83.

As shown in FIG. 5, the claws 68 and 73 of the fixtures 67 and 72 are guided by the guide member 89 so that the endless belt 62 does not shift in the left-right direction with respect to the tension pulley 65. The guide member 89 is fixed to the support shaft 65a by the fastener 88. The guide member 89 is arranged on the front side of the tension pulley 65 in the vicinity of the inner peripheral surface of the endless belt 62. The guide member 89 is arranged between the pair of claws 68 and 73 of the fixtures 67 and 72, and the left-right length of the guide member 89 is slightly shorter than the distance between the pair of claws 68 and 73 of the fixtures 67 and 72. .. Therefore, the claws 68 and 73 are guided by the side surface of the guide member 89, and the endless belt 62 does not shift in the left-right direction. Further, since the left-right length of the guide member 89 is longer than the thickness (left-right length) of the tension pulley 65, the pair of claws 68 and 73 of the fixtures 67 and 72 do not come into contact with the tension pulley 65.

The folding of the rear end flap 7 by the second flap folding device 60 will be described below with reference to FIGS. 6 to 11.

After the object to be packaged 1 has passed through the space between the cutter blade 41 and the blade receiver 42, and before the next object to be packaged 1 has passed through the cutting machine 40, the drive mechanism 43, the transfer machine 12, and the sandwiching transfer are performed. The machine 13 stops (see FIG. 6). At this time, the support roller 71 is located below the driven pulley 64, and the blank section 80 does not reach the driven pulley 64 above the suction port of the suction nozzle 90. Further, the shutter plate 66 on the rear row side is located above the suction port of the suction nozzle 90 and closes the suction port. Therefore, the tubular film 5 and the object to be packaged 1 on the upstream side are not drawn into the suction nozzle 90.

After that, the temporary stop of the transfer machine 12 and the sandwiching transfer machine 13 is completed, and the packaged object 1 is conveyed. At the same time, the drive mechanism 43 also operates, and the shutter plate 66, the support rollers 71, and the tacking rollers 81 to 83 move in the circumferential direction of the endless belt 62. Then, since the moving speed of the endless belt 62 is faster than the moving speed of the side belt 14 of the sandwiching carrier 13, the support roller 71 enters under the packaged object 1 and the film 5, and the packaged object 1 is the support roller. Supported by 71 (see FIG. 7). Further, the blank section 80 reaches above the suction port of the suction nozzle 90, and the suction port of the suction nozzle 90 is opened (see FIG. 7). At this time, the film 5 is cut by the cutting machine 40 as described above (see FIG. 7).

When the cutting of the film 5 is completed, the rear end flap 7 extending rearward from the object to be packaged 1 on the upstream side is drawn into the suction nozzle 90 through the blank section 80 (see FIG. 8). At this time, since the object to be packaged 1 is supported from below by the support roller 71, the object to be packaged 1 is not pulled down by the suction force of the suction nozzle 90. Further, since the support roller 71 supports the object to be packaged 1 from below even when the film 5 is cut, the inclination of the object to be packaged 1 can be suppressed.

After that, the packaged object 1 is transported (see FIG. 9). However, since the moving speed of the endless belt 62 is faster than the moving speed of the side belt 14 of the sandwiching carrier 13, the leading tacking roller 81 catches up with the packaged object 1, and the rear end flap 7 is the packaged object on the upstream side. It is sandwiched between the rear end of the lower surface of No. 1 and the tacking roller 81 (see FIG. 9).

Then, when the tacking rollers 81 to 83 pass under the packaged object 1 forward, the tacking rollers 81 to 83 slide in contact with the rear end flap 7 and roll, and the rear end flap 7 is moved to the lower surface of the packaged object 1. Press against (see FIGS. 10 and 11). Therefore, the rear end flap 7 is stretched forward from the rear end of the object to be packaged 1 along the lower surface of the object to be packaged 1 and is overlapped with the lower surface of the object to be packaged 1.

The support roller 71, the tacking rollers 81 to 83, and the shutter plate 66 make one round per cutting operation of the cutting machine 40. Therefore, each time the film 5 is cut, the rear end flap 7 is folded.

When the packaged object 1 moves from the position shown in FIG. 6 to the position shown in FIG. 10, the shutter plate 66 passes under the packaged object 1 forward. These shutter plates 66 do not come into contact with the already folded front end flaps 6, and the front end flaps 6 are not peeled off from the lower surface of the object to be packaged 1 by the shutter plates 66. This is because the shutter plate 66 is located inside the tacking rollers 81 to 83 and the support rollers 71 in the circumferential direction of the endless belt 62.

Further, when the object to be packaged 1 moves from the position shown in FIG. 7 to the position shown in FIG. 10, the support roller 71 slides against the lower surface of the object to be packaged 1 and rolls.

Further, as shown in FIG. 11, the object to be packaged 1 passing through the cutting machine 40 passes over the suction nozzle 90. Also at this time, since the suction port of the suction nozzle 90 is closed by the shutter plate 66, the front end flap 6 folded on the lower surface of the object to be packaged 1 is not peeled off by the suction force of the suction nozzle 90.

8. Heat-sealing treatment of flaps As shown in FIG. 1, the package 4 in which the flaps 6 and 7 are folded as described above is delivered from the sandwiching conveyor 13 to the discharge conveyor 17. The discharge conveyor 17 is provided with a heater 18. A pressing conveyor is provided above the discharge conveyor 17. Therefore, during the transportation of the package 4, the package 4 is lightly pressed downward by the pressing conveyor, and the flaps 6 and 7 are lightly heat-sealed by the heater 18.

9. Advantageous Effects (1) Since the shutter plate 66 is located inside the tacking rollers 81 to 83 and the support rollers 71, the front end that has already been folded when the shutter plate 66 passes under the packaged object 1 forward. The flap 6 does not have to be peeled off from the lower surface of the object to be packaged 1.

(2) Even if suction is constantly performed by the suction nozzle 90, when the suction port of the suction nozzle 90 is blocked by the shutter plate 66, the film 5, flaps 6, 7 and the object to be packaged 1 are attached to the suction nozzle 90. Not drawn in. That is, the object is not unnecessarily drawn into the suction nozzle 90.

(3) In particular, when the pitch of the shutter plates 66 is zero, or when the adjacent shutter plates 66 partially overlap, the suction port of the suction nozzle 90 can be firmly closed.

(4) Since suction is constantly performed by the suction nozzle 90, the packaging device 10 can be operated at high speed.

(5) Using the endless belt 62 made of rubber or synthetic resin, the operating noise generated is small.

(6) The attachment 67 that fastens the shutter plate 66 to the endless belt 62 is made of resin and is lightweight. Therefore, the load on the drive mechanism 43 can be reduced.

(7) The attachment 72 and the shaft member 75 for fastening the support roller 71 to the endless belt 62 are made of metal and have high strength. Therefore, the fixture 72 and the shaft member 75 can sufficiently bear the weight of the object to be packaged 1. Further, the fixture 72 and the shaft member 75 can sufficiently withstand the load when the rear end flap 7 is folded.

(8) The shutter plate 66 is not a rolling roller but a plate material. Such a shutter plate 66 is fastened to the endless belt 62 by a fixture 67 and a screw 69. Therefore, the shutter plate 66 is unlikely to be a source of rattle sound.

(9) The attachment and shaft member (same as the attachment 72 and shaft member 75) for fastening the tacking rollers 81 to 83 to the endless belt 62 are made of resin and are lightweight. Therefore, the load on the drive mechanism 43 can be reduced.

(10) If the shutter plate 66 is made of resin, the generation of rattle noise can be suppressed and the load on the drive mechanism 43 can be suppressed. The same applies when the rollers 71, 81 to 83 are made of resin.

(11) If the shutter plate 66 is made of metal, its rigidity is high. Therefore, even if the suction force of the suction nozzle 90 is large, the suction nozzle 90 can be firmly closed. If the rollers 71, 81 to 83 are made of metal, their rigidity is high. Therefore, the rear end flap 7 can be firmly folded and the packaged object 1 can be firmly supported.

(12) Even if the endless belt 62 is stretched due to aged deterioration or the like, there is play between the shutter plate 66 and the fixture 67, so that the shutter plate 66 is stably attached to the endless belt 62. Will be done.

(13) The guide member 89 prevents the pair of claws 68 and 73 of the fixtures 67 and 72 from coming into contact with the tension pulley 65. Therefore, damage to the tension pulley 65 can be suppressed.

10. Modifications The embodiments for carrying out the present invention have been described above. The above-described embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. Moreover, the embodiment of the present invention can be changed and improved without departing from the spirit of the present invention, and the present invention also includes an equivalent thereof. The changes from the above embodiments will be described below. Each of the changes described below may be applied in combination.

(1) The shutter plate 66 may be reinforced by beads or ribs.

(2) The power of the drive mechanism 43 of the second flap bending device 60 is transmitted to the transfer machine 12 or the sandwich transfer machine 13 by the gear mechanism, the belt transmission mechanism and other power transmission mechanisms, and the transfer machine 12 or the sandwich transfer machine 13 may be driven by the drive mechanism 43. When the power of the drive mechanism 43 is transmitted to the transfer machine 12 or the sandwiching transfer machine 13, the transfer speed of the transfer machine 12 or the sandwich transfer machine 13 is lower than the speed of the endless belt 62.

(3) The endless belt 62 may be replaced with an endless roller chain, and the pulleys 63 to 65 may be replaced with a sprocket. In this case, the left and right ends of the tacking rollers 81 to 83 and the support roller 71 are rotatably supported by the roller shaft of the endless roller chain. The left and right ends of the shutter plate 66 are fixed to the side plates of the endless roller chain at positions eccentric from the roller shaft of the endless roller chain. The shutter plate 66 is located inside the tacking rollers 81 to 83 and the support rollers 71.

(4) In the above embodiment, three tacking rollers 81 to 83 are attached to the endless belt 62. On the other hand, the tacking roller 83 is not provided, and instead, one or more additional shutter plates may be attached to the endless belt 62 in the same manner as the shutter plate 66. Alternatively, the tacking rollers 82, 83 may not be provided and instead one or more additional shutter plates may be attached to the endless belt 62 in the same manner as the shutter plates 66.

(5) The speed of the endless belt 62 may be adjusted. By doing so, the time from the time when the cutting machine 40 is cut to the time when the rear end flap 7 starts to be folded can be adjusted. In addition, the position of the object to be packaged 1 at the start of folding the rear end flap 7 can be adjusted.

(6) The speed of the endless belt 62 may be constant by controlling the drive mechanism 43 at a constant speed while the endless belt 62 goes around.

(7) The speed of the endless belt 62 may be changed by controlling the speed change of the drive mechanism 43 while the endless belt 62 makes one revolution. For example, the speed of the endless belt 62 may change as in (7A) and (7B) below.

(7A) The endless belt 62 moves at a low speed after the start of movement of the endless belt 62, that is, from the state shown in FIG. 6 until the tacking roller 81 hits the rear end flap 7 as shown in FIG. The speed of the endless belt 62 is higher than that of the side belt 14. After that, the rear end flap 7 is folded by the tacking rollers 81 to 83 while the endless belt 62 accelerates. After the rear end flap 7 is folded as shown in FIG. 10, the endless belt 62 moves to the state shown in FIG. 6, and the speed of the endless belt 62 at that time may be higher than that of the side belt 14. , It may be low speed or it may be constant speed.

(7B) The endless belt 62 is a side belt after the endless belt 62 starts moving, that is, after the state shown in FIG. 6 until the support roller 71 slips under the packaged object 1 as shown in FIG. 7 or 8. It moves at a constant speed of 14. After that, the endless belt 62 becomes faster than the side belt 14. Then, the leading tacking roller 81 catches up with the packaged object 1, and the rear end flap 7 is sandwiched between the rear end of the lower surface of the packaged object 1 on the upstream side and the tacking roller 81, and then as shown in FIG. The rear end flap 7 is folded. After that, the endless belt 62 moves to the state shown in FIG. 6, and the speed of the endless belt 62 at that time may be higher than that of the side belt 14, may be lower, or may be constant. There may be.

(8) A shutter roller may be used instead of the shutter plate 66. In this case, the shutter roller is attached to the endless belt 62 in the same manner as the rollers 71, 81 to 83, but the shutter roller has a smaller diameter than the rollers 71, 81 to 83. Therefore, the shutter roller is located inside the rollers 71, 81 to 83 with respect to the circumferential direction of the endless belt 62.

(9) In the above embodiment, a set of rows including the support roller 71, the plurality of shutter plates 66, and the three tacking rollers 81 to 83 are arranged in the circumferential direction of the endless belt 62. On the other hand, two or more sets of rows may be arranged in the circumferential direction of the endless belt 62. In this case, there is a blank section 80 between adjacent sets, that is, between the support roller 71 in the last row and the tacking roller 81 at the head of the adjacent set. Therefore, the number of blank sections 80 is equal to the number of pairs. Here, when there are two sets of rows consisting of the support roller 71, the plurality of shutter plates 66, and the three tacking rollers 81 to 83, the rear end flaps 7 of the two objects to be packaged 1 are while the endless belt 62 goes around. Is folded. Therefore, the moving distance of the endless belt 62 per folding of the rear end flap 7 is shortened, so that the life of the second flap bending device 60 can be extended.

(10) In the above embodiment, a plurality of shutter plates 66 are arranged in the circumferential direction of the endless belt 62. On the other hand, as shown in FIGS. 17 and 18, one flexible shutter plate 166 may be provided in the circumferential direction of the endless belt 62 in the section where the shutter plates 66 are arranged. Even in this case, one flexible shutter plate 166 is erected between the left and right timing belts 62. The flexible shutter plate 166 is located inside the rollers 71, 81 to 83 with respect to the circumferential direction of the endless belt 62. Further, the support roller 71 is adjacent to the rear end of the shutter plate 166, the tacking roller 83 is adjacent to the front end of the shutter plate 166, and the tacking rollers 83 to 81 are arranged in this order. In the example shown in FIG. 17, the flexible shutter plates 166 are arranged in the circumferential direction of the endless belt 62 in the same manner as the shutter plate 66 is attached to the endless belt 62 by the fixture 67 (see FIG. 3). It is attached to the endless belt 62 by the attached fitting 67. In the example shown in FIG. 18, the left and right ends of the shutter plate 166 are directly connected to the left and right endless belts 62, the shutter plate 166 and the left and right endless belts 62 are integrally formed, and the blank section 80 is an opening. There is.

1 ... Packaged 2 ... Tray 3 ... Article 5 ... Film 6 ... Front end flap (flap)
7 ... Rear end flap 10 ... Packaging device 43 ... Drive mechanism (drive unit)
60 ... Second flap bending device (flap bending device)
62 ... Endless belt (endless member)
66 ... Shutter plate (shutter part)
71 ... Support roller (support member)
81 ... Tacking roller (pressing member)
82 ... Tacking roller (pressing member)
83 ... Tacking roller (pressing member)
166 ... Flexible shutter plate (shutter part)

Claims (11)

In a flap folding device that bends a flap formed by a film wrapping an object to be packaged extending in the direction opposite to the transport direction of the object to be packaged and the film to be packaged.
A suction nozzle that is provided under the transport path of the packaged object and is directed upward to suck the flap.
An endless member provided in an endless shape so as to extend in the transport direction of the packaged object under the packaged object transport path and above the suction nozzle.
A drive unit that drives the endless member in the same direction as the transport direction of the packaged object at a speed higher than the transport speed of the packaged object.
The suction nozzle is attached to the endless member so as to be arranged in the circumferential direction of the endless member in a part of the entire circumference of the endless member, and when the suction nozzle is driven by the endless member to pass over the suction nozzle. With multiple shutters that block
Among the sections of the entire circumference of the endless member in which the plurality of shutter portions are not arranged, the plurality of cases where the direction in which the endless member is driven by the driving portion is set before the arrangement of the plurality of shutter portions. A flap attached to the endless member and sucked by the suction nozzle is pressed against the lower surface of the object to be packaged by driving the endless member at a position away from the rear end of the arrangement of the shutter portions. Members and
With
A flap bending device in which the plurality of shutter portions are located inside the pressing member in the circumferential direction of the endless member. Of the entire circumference of the endless member, in the section where the plurality of shutter portions are not arranged, the object is attached to the endless member at a position in front of the pressing member, and the packaged object is driven by the endless member. Further provided with a support member that slides into the lower surface,
The flap bending device according to claim 1, wherein the plurality of shutter portions are located inside the support member in the circumferential direction of the endless member. The plurality of shutter portions when the support member is located forward from the pressing member and the direction in which the endless member is driven by the drive portion is set before the arrangement of the plurality of shutter portions. The flap bending device according to claim 2, which is attached to the endless member at a position adjacent to the rear end of the array. The item according to any one of claims 1 to 3, wherein there are a plurality of the pressing members, and the plurality of pressing members are arranged in the circumferential direction of the endless member in front of the front row of the arrangement of the plurality of shutter portions. The flap bending device described. In a flap folding device that bends a flap formed by a film wrapping an object to be packaged extending in the direction opposite to the transport direction of the object to be packaged and the film to be packaged.
A suction nozzle that is provided under the transport path of the packaged object and is directed upward to suck the flap.
An endless member provided in an endless shape so as to extend in the transport direction of the packaged object under the packaged object transport path and above the suction nozzle.
A drive unit that drives the endless member in the same direction as the transport direction of the packaged object at a speed higher than the transport speed of the packaged object.
A flexible shutter portion provided in the circumferential direction of the endless member in a part of the entire circumference of the endless member and closing the suction nozzle when passing over the suction nozzle by driving the endless member. When,
Of the entire circumference of the endless member, in the section where the shutter portion is not provided, the direction in which the endless member is driven by the drive portion is the front of the shutter portion, and the rear end to the rear of the shutter portion. A pressing member attached to the endless member and sucking the flap by the suction nozzle against the lower surface of the object to be packaged by driving the endless member.
With
A flap bending device in which the shutter portion is located inside the pressing member in the circumferential direction of the endless member. It is attached to the endless member at a position in front of the pressing member in the section of the entire circumference of the endless member where the shutter portion is not provided, and is driven by the endless member to the lower surface of the packaged object. Further equipped with support members that slide in contact with each other
The flap bending device according to claim 5, wherein the shutter portion is located inside the support member in the circumferential direction of the endless member. Adjacent to the rear end of the shutter portion when the support member is located forward from the pressing member and the direction in which the endless member is driven by the drive portion is in front of the shutter portion. The flap bending device according to claim 6, which is attached to the endless member at the position. The flap bending apparatus according to any one of claims 5 to 7, wherein there are a plurality of the pressing members, and the plurality of pressing members are arranged in the circumferential direction of the endless member in front of the front end of the shutter portion. .. The flap bending device according to any one of claims 2, 3, 6, and 7, wherein the support member is a rollable roller. The flap bending device according to any one of claims 1 to 9, wherein the pressing member is a rollable roller. The flap bending device according to any one of claims 1 to 10, wherein the suction nozzle constantly generates a suction force.

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