JP2023173665A - Bag supply device - Google Patents

Abstract

To solve the problem that a conventional bag supply device sometimes shifts a bag backward when the bag is sucked by a suction cup.SOLUTION: A bag supply device 20 sucks and supplies an uppermost bag 2 in stacked bags 2 by means of a suction cup 7. The bag supply device includes: a suction cup support block 22 that supports the suction cap 7; a swing link 23 that is journaled in a swingable manner around an axis center H provided on a center rear part; a tip support link 24 that is rotatably attached to a tip end portion of the swing link 23 and supports the suction cup support block 22 in a state in which the suction cup support block 22 is rotated integrally; an actuator 25 that has a body 25a and an exit rod 25b, the body 25a being attached in a rotatable state to the swing link 23 and the exit rod 25b being connected to the tip support link 24 in a rotatable state; and a drive force transmission link 26 that swings the swing link 23 by a main drive shaft 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bag supply device that supplies empty bags to a rotary packaging device or the like.

The bag supply device of the present invention is a device that picks up empty bags stored in a stacked state one by one and supplies them to a rotary packaging device or the like. FIG. 5 shows a bag feeding device (bag box) 1 disclosed in Patent Document 1, in which a large number of empty bags (bag groups) 2 are stacked vertically. It is stored. The bag feeding device 1 of Patent Document 1 includes a shelf board 3 that supports stacked bags from below, a pair of left and right side plates 4 that prevents the bags from shifting laterally, and prevents the stacked bags from moving forward. It is equipped with a stopper plate 5 and the like to prevent this. When the bags 2 are picked up one by one from the bag feeding device 1, the lifting shaft 6 is rotated by a motor (not shown) (hereinafter, rotation in one direction is referred to as "rotation", and rotation in the forward and reverse directions is referred to as "rotation"). ), the shelf board 3 rises a little, and the height of the topmost bag 2 becomes constant.

In FIG. 5, 7 is a suction cup that sucks the bag 2, 8 is a suction hose that sucks air from the suction cup 7 (applies negative pressure), and 9 is a delivery mechanism, in which the bag 2 is lifted by suction cup 7. is held by the gripping section 10 and delivered to a rotary packaging device or the like. Further, 11 is a parallel link mechanism for swinging the suction cup 7 along a predetermined trajectory. As shown in FIG. 7, the role of the parallel link mechanism 11 is to swing the suction cup 7 so that the suction surface of the suction cup 7 is parallel to the uppermost bag 2 when the suction cup 7 is lowered.

The parallel link mechanism 11 is composed of four links: an upper swinging link 11A, a lower swinging link 11B, a leading end side connecting link 11C, and a rear end side connecting link 11D, and these links 11A to 11D are connected to connecting portions 12A to 11D. They are rotatably connected to each other by 12D. Further, as shown in FIG. 5 and the like, the suction cup support block 13 to which the suction cup 7 is attached is supported by two support rods 14A and 14B extending laterally from the distal end side connecting link 11C. The suction cup support block 13 and the suction cup 7 rotate together as a result of the rotation of the distal end side connecting link 11C.

As mentioned above, the upper swing link 11A and the rear end side connecting link 11D are rotatably connected by the connecting part 12A, but this connecting part 12A has a driving rotation of a coaxial center with the connecting part 12A. A moving shaft 15 is inserted. The drive rotation shaft 15 rotates in forward and reverse directions by a drive source such as a link mechanism (not shown), but this rotation force is not directly transmitted to the upper swing link 11A, but only to the rear end side connecting link 11D. communicated. Therefore, the drive rotation shaft 15 rotates the rear end side connecting link 11D around the axis X of the connecting portion 12A within a predetermined angular range. Accordingly, even after the lower swing link 11B and the upper swing link 11A overlap in parallel, the rear end side connecting link 11D is further rotated in the direction G in FIG. 6 by the drive rotation shaft 15. . Therefore, the suction cup 7 at the tip of the parallel link mechanism 11 rotates upward, and the bag 2 is lifted. After the bag 2 is gripped by the gripper 10 of the delivery mechanism 9, it is supplied to a rotary packaging device or the like.

Conversely, when the bag 2 is sucked by the suction cup 7, the clockwise rotation of the drive rotation shaft 15 causes the rear end side connecting link 11D to rotate in the direction E in FIG. 11B and the distal end side connecting link 11C interlock, the distal end side connecting link 11C and the rear end side connecting link 11D are in a substantially vertical posture, and the suction surface of the suction cup 7 is in a posture along the flat part of the bag 2 (for example, As shown in Fig. 7, the position is horizontal (horizontal). At this time, a suction operation is performed by the suction cup 7 of the bag 2, and the uppermost bag 2 is suctioned.

Japanese Patent Application Publication No. 2011-219122

In the conventional bag feeding device 1 of Patent Document 1, the drive rotation shaft 15 is rotated in forward and reverse directions by a drive source such as a link mechanism (not shown), and this rotation force is applied to the upper and lower sides of the suction cup 7 by the parallel link mechanism 11. Two actions are performed: a swinging action and an action of rolling up the bag 2. However, in the conventional bag feeding device 1, the following problems may occur. That is, in the parallel link mechanism 11, the rear end side connecting link 11D rotates in the E direction in FIG. 13 rotates clockwise (direction F in FIG. 7) around the connecting portion 12C (axis Y). Normally, as shown in FIG. 7, if the suction surface of the suction cup 7 is in a posture along the plane of the bag 2, the suction cup 7 will surely suction the bag 2 and the bag 2 will not shift from its correct position. There isn't. However, when the parallel link mechanism 11 moves at a high speed, the uppermost bag 2 may be shifted rearward due to the momentum of the clockwise rotation of the suction cup 7 (direction F in FIG. 7).

If the bag 2 shifts backward, there is a risk that the bag 2 will be out of position when being transferred from the transfer mechanism 9 to the clamp of the rotary packaging device. If the bag 2 is displaced, the proper sealing position of the bag opening by the sealer of the rotary packaging device will be displaced, and there is a risk that defective products will be produced. In extreme cases, a gripping error may occur when the gripping section 10 of the delivery mechanism 9 grips the rolled-up bag 2. Furthermore, mistakes may occur when the bag 2 is transferred from the transfer mechanism 9 to the rotary packaging device.

In view of this problem, an object of the present invention is to provide a bag feeding device that can prevent the bag from shifting backward when the bag is sucked by a suction cup.

The bag feeding device of the present invention is a bag feeding device that sucks the uppermost bag of a plurality of stacked and stored bags using a suction cup and supplies it to a packaging device, and the bag feeding device has a main driving shaft. A swinging link that is rotatably supported around the main rotation axis by a driving force, a tip support link that is attached to the tip of the swinging link so that it can rotate around the tip rotation axis, and a tip A suction cup support block with a suction cup attached, which is attached to the tip of the support link and rotates integrally with the tip support link, and the tip support link rotates around the tip rotation axis of the tip support link. An actuator.

According to this configuration, in the suction process, before the suction cup reaches the suction position, the actuator is driven to rotate the tip support link, and after this, the swinging link is rotated and the bag is suctioned by the suction cup. do. In other words, when moving the bag from the supply position to the suction position, the actuator is driven in advance to rotate the tip support link, and when the suction cup is subsequently moved to the suction position, the suction cup and suction cup are rotated. The bag is sucked by rotating the swinging link without rotating the support block and the tip support link so that the suction surface of the suction cup takes a suction posture along the surface of the bag.

According to the bag feeding device of the present invention, when a bag is suctioned by a suction cup, the suction surface of the suction cup is attached to the bag without rotating the suction cup support block to which the suction cup is attached or the tip support link with respect to the swing link. Bags can be suctioned in a suction position along the surface. This prevents the bag from shifting backward when the suction cup sucks the bag.

Side view of the bag feeding device of the present invention Side view of the bag feeding device when it is sucking bags Side view of the bag feeding device when feeding bags Side view of a bag supply device according to a modified example of the present invention Side view of conventional bag feeding device Side view of conventional bag feeding device Side view of conventional bag feeding device

Hereinafter, the bag supply device 20 of the present invention will be explained based on the drawings. Note that the same components as those of the conventional bag feeding device 1 will also be explained, and the same reference numerals will be used for the components having the same functions. As shown in FIG. 1, also in this bag supply device 20, a large number of empty bags (bag group) 2 are stored in the bag supply device 20 in a vertically stacked state. The bag supply device 20 includes a shelf board 3 that supports stacked bags from below, and a pair of left and right side plates 4 that guides the stacked bags on the shelf board 3 and prevents them from shifting laterally. A stopper plate 5 and the like are provided to prevent the bag group from moving forward. Note that when the topmost bags 2 are picked up one by one from the bag supply device 20, the lifting shaft 6 is rotated by a motor (not shown), and the shelf board 3 is slightly raised to keep the height of the topmost bags 2 constant. do. In FIG. 1, 7 is a suction cup that sucks the bag 2, 8 is a suction hose that sucks air from the suction cup 7 (applies negative pressure), and 9 is a delivery mechanism, which is sucked by the suction cup 7 and rolled up. The bag 2 is gripped by a gripper 10 and delivered to a rotary packaging device or the like.

21 is a link mechanism that supports the suction cup 7 while moving it along a predetermined movement trajectory. The link mechanism 21 of the present invention includes a suction cup support block 22 as a member that supports the suction cup 7, a swinging link 23 that is pivotally supported to be able to swing (rotate) around an axis H near the center rear side, A tip support link 24 that is rotatably supported across the tip of the swing link 23 and rotatably supports the suction cup support block 22, and a rear lower end of the swing link 23 and the tip support link 24. an actuator 25 that spans the lower end of the actuator 25 and rotates the tip support link 24 around the axis I, and a driving force transmission link 26 that swings (rotates) the swing link 23 around the axis H. It is equipped with. In this embodiment, the actuator 25 uses an air cylinder, and has a main body 25a of the air cylinder and a retractable rod 25b that moves in and out from the main body 25a. The proximal end of the rod 25a is rotatably attached, and the tip of the retractable rod 25b is connected to the lower end of the tip support link 24.

Note that the swing link 23, the tip support link 24, the actuator 25, the driving force transmission link 26, and the like of the link mechanism 21 are arranged on the side of the bag supply device 20. Further, 27 is a tip rotation shaft, which is rotatably attached to the swing link 23 via a bearing 27A, and the tip support link 24 is attached to this tip rotation shaft 27. Reference numeral 28 denotes a main rotation shaft, which is rotatably provided on the side plate 4 via a bearing 28A, and the swing link 23 is rotatably attached to the main rotation shaft 28. The center of this main rotating shaft 28 is the axis H around which the swing link 23 swings.

In this embodiment, a suction cup support block 22 that supports the suction cup 7 is supported by two support rods 29A and 29B that extend laterally from the top of the tip support link 24. That is, the suction cup support block 22 is supported by the tip support link 24 via the support rods 29A and 29B, and the suction cup support block 22 and the suction cup 7 rotate integrally with the tip support link 24.

Further, the upper end portion of a transmission link 26A that constitutes the driving force transmission link 26 is fixed to the main rotation shaft 28, and is arranged to extend downward. On the other hand, the upper end portion of a drive link 26B, which also constitutes the drive force transmission link 26, is fixed to the main drive shaft 30 and is arranged to extend downward. An adjustable connection link 26C, whose connection distance can be adjusted, connects the lower ends of the transmission link 26A and the drive link 26B. The drive link 26B rotates around the main drive shaft 30 by a drive source such as a link mechanism (not shown), and this movement is transmitted to the main rotation shaft 28 via the adjustment link 26C and the transmission link 26A. and swings the swing link 23.

The bag supply device 20 is equipped with a control device (not shown). This control device drives the actuator 25 from the supply position (Fig. 3) in which the bag 2 is delivered from the suction cup 7 to the delivery mechanism 9, and in the preparation position (Fig. 1) before the suction cup 7 reaches the suction position (Fig. 2). Then, the tip support link 24 rotates clockwise around the axis I, and the suction cup support block 22 is controlled to be rotated so that the suction surface of the suction cup 7 is in a suction posture along the surface of the bag 2. Specifically, when feeding the bag 2 in the supplying attitude, the retracting rod 25b of the actuator 25 is extended, but when the feeding operation of the bag 2 is finished, the ejecting and retracting rod 25b is contracted in the preparation attitude shown in FIG. do. However, as described above, the rotation of the suction cup support block 22 may be such that the suction cup 2 gradually rotates between the supply position and the suction position.

In addition, in the supply posture shown in FIG. 3 in which the bag 2 is supplied to the delivery mechanism 9, the suction surface of the suction cup 7 is aligned with the pivot axis H of the swing link 23 and the swinging axis H of the tip support link 24 in a side view. It is located above the extension of the straight line connecting the axis I of the tip rotation shaft 27. On the other hand, in the preparation posture shown in FIG. 1 in which the retractable rod 25b of the actuator 25 is reduced, the axis H of the swinging link 23 and the axis of the tip rotation shaft 27 of the tip support link 24 are The suction surface of the suction cup 7 is arranged along an extension of the straight line connecting the core I. Furthermore, the same holds true for the suction posture shown in FIG. 2 showing the suction state of the suction cup 7, in which the suction surface of the suction cup 7 is arranged along an extension of the straight line connecting the axis H and the axis I. , almost coincides with the position where the uppermost bag 2 is sucked.

In this embodiment, the swinging link 23 is a thick, substantially L-shaped link lying down when viewed from the side, and the front end is semicircular and wider than the rear end. On the other hand, the rear end side is narrow and extends downward, and the base end of the main body 25a of the actuator 25 is rotatably supported at the lower end. However, the swing link 23 is not limited to this form.

Next, the operation of the bag supply device 20 will be explained. When the suction cup 7 suctions the bag 2, the main drive shaft 30 rotates the drive link 26B in the J direction from the preparation position of the suction cup 7, as shown in FIG. This movement is transmitted to the main rotating shaft 28 via the adjustment link 26C and the transmission link 26A. Therefore, the swing link 23 attached to the main rotation shaft 28 rotates in the K direction (FIG. 2), and its tip descends. As a result, the tip support link 24, the suction cup support block 22, and the suction cup 7 rotate integrally about the axis H without changing their relative positions with respect to the swing link 23. When the suction cup 7 contacts the uppermost bag 2, the suction surface of the suction cup 7 comes into contact with the bag 2 in a posture substantially along the surface of the bag 2, and the bag 2 is suctioned by the suction operation of the suction cup 7.

That is, before performing the suction operation of the bag 2, the retractable rod 25b of the actuator 25 is contracted in advance, and the tip support link 24 is not rotated with respect to the swing link 23 during suction. As a result, during suction, the swing link 23 rotates around the axis H, and the suction cup 7 descends in a nearly straight trajectory to perform the suction operation. In this way, when suctioning, the bag 2 can be suctioned without rotating the tip support link 24 with respect to the swing link 23. , this bag 2 will not be shifted backward. For this reason, it is possible to prevent the occurrence of defective products due to misalignment of the seal position by the sealer of rotary packaging equipment, etc., which has conventionally occurred, and the occurrence of mistakes when transferring the bag 2. It is possible to improve the reliability of packaging machines such as devices.

Note that after the suction cup 7 suctions the bag 2, the main drive shaft 30 rotates in the opposite direction, and as shown in FIG. It rotates to raise the tip of the swing link 23. Until the tip of the swing link 23 reaches the bag 2 supplying position or after the bag 2 is in the supplying position, the retractable rod 25b of the actuator 25 is extended, and the tip support link 24 is moved as shown in FIG. The upper part of the unit rotates so that it tilts diagonally backward. As a result, the suction cup support block 22 and the suction cup 7 are brought into the supply position integrally with the distal end portion of the distal end support link 24. Thereafter, one end of the bag 2 lifted diagonally upward is gripped by the grip part 10 of the delivery mechanism 9, and delivered to a clamp of a rotary packaging machine or the like. Note that when the bag 2 is gripped by the gripping section 10, the suction operation of the suction cup 7 is stopped, so that the bag 2 is gripped by the gripping section 10 of the delivery mechanism 9 and can be delivered to a rotary packaging device or the like.

In addition, according to the above configuration, since the transmission link 26A and the drive link 26B are connected by the adjustment connection link 26C, the connection distance between them can be adjusted, depending on the position of the uppermost bag 2. Thus, the suction position of the suction cup 2 can be adjusted to a state more suitable for suction.

In the embodiment described above, the driving force transmission link 26 is provided between the swing link 23 and the main drive shaft 30 to rotate the main rotation shaft 28, but the invention is not limited to this, and for example, , the main rotating shaft 28 may be directly rotated by a motor or the like. Although the tip rotation shaft 27 is rotated by the actuator 25 via the tip support link 24, the tip rotation shaft 27 may also be configured to be directly rotated by a motor or the like.

Further, in the embodiment, an air cylinder is used as an actuator for rotating the tip support link 24, but the actuator 25 is not limited to an air cylinder, and may be a type that expands and contracts using an electromagnet such as a solenoid. It may be a mechanical one. Alternatively, a mechanism such as a linear actuator may be used.

Furthermore, in the embodiments shown in FIGS. 1 to 3, the stacked bags 2 are stacked with their surfaces substantially horizontal, but the configuration is not limited to this. That is, as shown in FIG. 4, the stacked bags 2 may be stacked with a slight downward slope. According to this, the bags 2 will not shift backward during suction, etc. can be more reliably prevented.

Furthermore, in the above embodiment, a case has been described in which the bags 2 are supplied to a rotary packaging device, but in addition to the rotary packaging device, a linear packaging device or an elliptical packaging device may also be used. The type doesn't matter.

INDUSTRIAL APPLICATION This invention is useful for the bag supply apparatus which supplies an empty bag to various packaging machines, such as a rotary type packaging machine.

2 Bag 3 Shelf board 4 Side plate 5 Stopper plate 6 Lifting shaft 7 Suction cup 8 Suction hose 9 Delivery mechanism 10 Grip section 20 Bag supply device 21 Link mechanism 22 Suction cup support block 23 Swing link 24 Tip support link 25 Actuator 25a Main body 25b Egress/retraction Rod 26 Driving force transmission link 26A Transmission link 26B Drive link 26C Adjustment connection link 27 Tip rotation shaft 27A Bearing 28 Main rotation shaft 28A Bearings 29A, 29B Support rod 30 Main drive shaft H Axial center I Axial center

Claims (4)

A bag feeding device that sucks the topmost bag of a plurality of stacked and stored bags using a suction cup and supplies it to a packaging device,
The bag supply device includes a swing link rotatably supported around a main rotation shaft by the driving force of a main drive shaft;
a tip support link rotatably attached to the tip of the swing link around a tip rotation axis;
a suction cup support block attached to a suction cup, which is attached to the tip of the tip support link and rotates integrally with the tip support link;
an actuator that rotates the tip support link around the tip rotation axis of the tip support link;
A bag feeding device comprising: The main drive shaft and the swing link are connected by a drive force transmission link composed of a transmission link, a drive link, and an adjustment connection link, and the swing link is rotated by the driving force of the main drive shaft.
2. The bag feeding device according to claim 1, wherein an actuator comprising an air cylinder is connected to the tip support link, and the tip support link is rotated by moving an ejecting and retracting rod of the air cylinder. The bag supply device is provided with a control device, and in the suction process, before the suction cup reaches the suction position, the control device drives the actuator to rotate the swing link from the bag delivery position to the bag delivery position. 2. The bag feeding device according to claim 1, wherein the tip support link is controlled to rotate so that the suction surface of the suction cup is in a suction posture along the surface of the bag. When the retractable rod of the actuator is reduced, the suction surface of the suction cup when suctioning a bag is configured to be along an extension of the straight line connecting the axis of the swing link and the axis of the tip support link. The bag feeding device according to claim 2, characterized in that: