JP2720883B2 - Opening device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an opening device for opening a bag or the like formed of a flexible material such as a synthetic resin sheet.

[Conventional technology]

2. Description of the Related Art Conventionally, simple packaging made of a flexible material such as a synthetic resin sheet is frequently used for packaging foods and clothing sold at convenience stores and supermarkets, instead of paper bags.

[Problems to be solved by the invention]

In this type of bag, a bottom portion, an intermediate portion, and a handle portion are integrally formed by performing a punching process on a cylindrical band-shaped synthetic resin sheet, and the side portions of the bag are in close contact with each other by static electricity and the like. In addition, since the opening is troublesome due to the flexibility of the synthetic resin sheet of the material, and the insertion opening is difficult to open, it takes time and effort to insert a product.

Therefore, the present invention is directed to an opening device for facilitating the opening of a soft, flat, cylindrical object to be opened, such as a bag formed of a flexible material such as a synthetic resin sheet, in order to solve the above drawbacks. The provision is the first purpose.

It is a second object of the present invention to provide an opening device that reliably grips an object to be opened and improves the reliability of the opening operation.

A third object of the present invention is to provide an opening device capable of reliably opening each object to be opened corresponding to objects having different sizes.

[Means for solving the problem]

An opening device according to the present invention is an opening device that opens a bag formed of a flexible member such as a synthetic resin sheet or the like as an object to be opened, and a storage unit that stores the bags in a stacked state. A chucking mechanism for picking up one of the bags from the storage means and hanging the bag above the storage means, and clamping the hanging bag by the chucking mechanism. Transfer means for receiving the bag from the king mechanism and transferring the bag to the opening position side; and a first chuck for gripping a part of the back side when the transfer means is hanging the bag at the opening position side. A second chuck, which is provided opposite to the first chuck and sandwiches the bag, and grips a part of the front side of the bag;
The first chuck and the second chuck
By increasing the distance between the first chuck and the first chuck,
And a transport means for opening the bag while being held by the second chuck and the second chuck.

Further, in the opening device of the present invention, the first chuck is installed in a transfer path of the supply unit, and when the supply unit transfers the object to be opened, the first chuck is temporarily retracted from the transfer path to remove the object to be opened. It is characterized by passing through and returning after the transfer is completed, facing the back side of the object to be opened.

In the opening device of the present invention, the first chuck includes a plurality of chucks having different gripping positions corresponding to the objects to be opened having different sizes.

[Action]

In the operation of opening the bag, the object to be opened, which is a bag, is quickly transported in a short section up to a predetermined position of the bag opening by the supply means which has been waiting at a position near the bag opening side in the course of transport, and the transported object to be opened is The object is gripped on the back side by the first chuck and opened by the front side gripped by the second chuck. In this case, with the opening operation by the first chuck and the second chuck, the supply unit that supplies the object to be opened grasps the object to be opened stored in the standby position and returns to the position near the bag opening side again. By waiting, the supply system leading to the opening is prepared, and the transfer time from the take-out position of the object to be opened to the bag opening side is reduced.

Further, the first chuck is installed in a transfer path of the supply unit, and when the supply unit transfers the object to be opened,
Once retreating from the transfer path and passing the object to be opened, and returning after the completion of the transfer so as to face the back side of the object to be opened, it is waiting at a position near the bag opening side by the opening operation. As the object to be opened is transferred to the predetermined position of the bag opening by the supply means, the first chuck rotates and retreats once from the transfer path, returns after passing through the object to be opened, and is held by the supply means. Thus, the back side of the suspended object can be grasped.

When the first chuck is constituted by a plurality of chucks having different gripping positions corresponding to the objects having different sizes, the openings having different sizes are selected by selecting the chucks for the objects having different sizes. An object can be opened.

〔Example〕

FIG. 1 shows an embodiment of the opening device of the present invention,
(A) shows its planar configuration, and (B) shows its side configuration.

The bag 2 as an object to be opened is formed of a flexible material such as a synthetic resin sheet, and is installed in storage mechanisms 4 and 6 set for each bag 2 according to the size of the volume. Each storage mechanism 4 in which the bags 2 are stored in a stacked state,
As shown in FIG. 2, reference numeral 6 is provided so as to be able to be taken in and out of the side plate 12 of the frame 8 on which the operation panel 10 is installed, and is integrally formed with drawer plates 14 and 16 which form a part of the side plate 12. Have been.

Above each of the storage mechanisms 4 and 6, as shown in FIG. 1B, the bag 2 is gripped from each of the storage mechanisms 4 and 6 and transferred to a standby position P on the bag-opening side and made to stand by. A supply mechanism 18 is provided as supply means for supplying the bag 2 to the opening position Q of the bag opening in response to the bag opening operation. Supply mechanism 18
Are chucking mechanisms 20 and 22 installed as chucking means for gripping the bag 2 from the storage mechanisms 4 and 6, and a transfer mechanism for taking the bag 2 from these chucking mechanisms 20 and 22 and transferring the bag 2 to the bag opening side. 24, a supply chuck 26 of a chucking mechanism 20, 22 for directly gripping the bag 2,
The arm 28 is set up and down by arm mechanisms 30 and 32 that extend and contract using a motor or the like as a drive source.

Further, the transfer mechanism 24 is provided with two sets of transfer belts 38A, 38B, 40A, and 40B corresponding to the chucking mechanisms 20 and 22 and rotating with a plurality of large and small rollers 34 and 36, respectively. A transfer path that circulates between the chucking area of the bag 2 and the bag opening side by the transfer belts 38A, 38B, 40A, and 40B is provided. As shown in FIG. 1A, an outer roller 34A and an inner roller 34B, which are coaxially provided, are provided above the transfer mechanism 24 for each of the rollers 34, 36. And a transfer belt suspended between each outer roller 34A, 36A
Transfer members 42 and 44 for picking up the bag 2 from the chucking mechanisms 20 and 22 are provided on the transfer belts 40A and 40B suspended between the inner rollers 34B and 36B and the transfer members 42 and 44, respectively. , 44 are provided with, for example, holding mechanisms 46, 48 for resiliently opening and closing by contacting a cam or the like provided on the transfer path as means for pulling and holding the bag 2.

Then, the transfer members 42 and 44 that have pulled the bag 2 from the chucking mechanisms 20 and 22 provide a quick operation response for supplying the bag 2 according to the bag opening operation, so that the bag opening side during the conveyance is obtained. It moves to the waiting position P and stands by, and conveys the bag 2 to the opening position Q in response to the bag opening operation. The bag 2 transferred to the opening position Q of opening the bag is provided with rotating chucks 50A, 50B and 50C as first chucks installed above the chucking mechanisms 20 and 22, and the rotating chucks 50A and 50C.
Bag-opening transport chuck 5 as a second chuck facing B
The bag is opened by the bag opening chuck 2 and the bag opening chuck 54, and after the articles are stored, the bag opening / conveying chuck is moved on the stage 56 installed below the bag opening / conveying chuck 52 and the bag opening chuck 54.
It is conveyed while being held by only 52 and is taken out from the outlet 58. At the end side of the stage 56, a fall prevention plate for preventing the bag 2 released from the bag opening transport chuck 52 from falling over.
There are 60 installed.

The rotary chucks 50A, 50B, and 50C are mounted on a single rotating mechanism 62 so as to be able to move at the same time. The transfer member that rotates and returns after passing, and stops at the opening position Q
The hanging bag 2 held by 42 or the transfer member 44
It is set to face the back side while pushing up.

Further, the bag-opening transport chuck 52 is installed on a first moving mechanism 66 installed on the side wall portion 64, and as an endless rotating body, for example, a chuck 72 with a fixed interval on a chain 72 suspended between sprockets 68 and 70. It is attached so that the surface always faces the front side of the bag 2. In addition, open bag chuck 54
Is installed on a second moving mechanism 76 installed on the side wall 74 of the short section facing the side bag 64, and, like the bag-opening transport chuck 52, is suspended between the sprockets 78 and 80 as an endless rotating body. Chuck surface is always bag 2 on turned chain 82
It is attached so as to face the front side.

Then, each of the bag-opening transport chucks 52 and the bag-opening chucks 54
With the evacuation rotation of the rotary chucks 50A, 50B, 50C,
The forward movement of each of the moving mechanisms 66 and 76 causes the rotary chucks 50A, 50B and 50C to move forward to a position where a predetermined distance from the rotary chucks 50A, 50B, and 50C is set, and then retreats by the reverse rotation to rotate the rotary chucks 50A, 50B and 50C. In cooperation with the opening operation, the opening operation of grasping the bag 2 and then moving forward again is performed.

Further, a stage 56 installed below between the bag-opening conveyance chuck 52 and the bag-opening chuck 54 has rollers 84 and 86 disposed at a predetermined interval, and a conveyance loop suspended between these rollers 84 and 86. It has a belt 88 and is driven by a motor 90 via a certain roller 84. An L-shaped partition plate 92 that partitions the space between the supply mechanism 18 and the stage 56 is provided on the lower surface side of the transport belt 88.

As shown in FIG. 3, the bag 2 is formed by press-punching a synthetic resin sheet having a cylindrical band shape into a bottom portion 2a and an intermediate portion.
2b and a handle 2c having recesses 2d and 2e on both sides are integrally formed.

As shown in FIG. 1 (B), the storage mechanisms 4 and 6 for storing the bag 2 keep the middle portion 2b of the bag 2 flat over a certain range and set both ends in a hanging state. The supporting body portions 4a and 6a for supporting, the bottom portion which is one of the lower end portions
It comprises lower end receiving portions 4b and 6b for supporting 2a and upper end receiving portions 4c and 6c for supporting a handle portion 2c which is the other lower end. Further, side support plates for preventing the bags 2 stacked at a certain height from being out of shape in the width direction are attached to both side surfaces of the support main bodies 4a and 6a. The handle portion 2c of the bag 2 has two recesses 2d and 2e, and the upper end receiving portion comprises
Supported by 4c and 6c. Therefore, the bag 2 having a shrinkage allowance due to heat welding that leads to a decrease in chucking accuracy.
The bag 2 can be set such that both ends of the bag 2 are kept away from the chucking area, and only the flat middle portion 2b always faces the chucking area.

The opening operation based on the above configuration will be described with reference to FIG.

The transfer members 42 and 44 holding the bag 2 and always waiting at the standby position P move to the opening position Q in response to the bag opening operation. For example, when the opening operation of the large-sized bag 2 is performed. , As shown in FIGS. 4A and 4B,
With the rotation mechanism 62, the rotary chucks 50A, 50B, and 50C rotate in the direction of arrow R that does not hinder the movement of the transfer members 42 and 44, and retreat from the transfer path, and with the retreat of the rotary chucks 50A, 50B, and 50C. Then, the transfer member 44 holding the bag 2 of the designated size moves to the opening position Q. In addition, as the rotary chucks 50A, 50B, and 50C retract, the bag-opening transport chuck 5
2 and the bag opening chuck 54 are moved forward by the forward rotation of the moving mechanisms 66 and 76, and are rotated toward the stage 56 by rotating chucks 50A, 50B and 50.
It moves to a position S that is a certain distance away from C.

When the transfer member 44 moves to the opening position Q, as shown in FIG. 4C, the rotary chucks 50A, 50B, 50C
While pushing up the hanging bag 2 held by the transfer member 44, the bag 2 returns to the original position and faces the back side of the bag 2.
When the rotary chucks 50A, 50B, 50C face the back side of the bag 2, the bag-opening transport chuck 52 and the bag-opening chuck 54 are driven in reverse rotation from the stop position S, as shown in FIGS. , The front side of the bag 2 is gripped in cooperation with the opposing rotary chucks 50A and 50B, and after the grip, the rotary chucks 50A and 50B are again driven by the normal rotation.
The opening is performed by moving forward in the direction of arrow U away from B and 50C, and stops at the opening end position V determined by the opening width according to the size of the bag 2. With this opening operation, the bag 2
Is moved in the direction of the arrow W toward the chucking mechanism 22 to take the bag 2 and wait at the standby position P so as to be able to cope with the next bag opening operation. The same applies to the case where the transfer member 42 operates by the bag opening operation.

The standby position P is a position that does not hinder the rotation of the rotary chucks 50A, 50B, 50C.
Is set at a position where the hanging state of the bag 2 by holding the transfer members 42 and 44 is optimal for opening the bag.

FIG. 5 shows an open state corresponding to the size of the bag 2. When the size of the bag 2 is large, as shown in FIG.
Opening is performed by the bag chuck 0B, 50C, the bag-opening conveyance chuck 52, and the bag-opening chuck 54, and when the size of the bag 2 is small, as shown in FIG.
The opening is performed by the opening transport chuck 52 at 0C.

Rotary chucks 50A, 50B, 50C and bag-opening transport chuck 52
And the bag 2 opened by the bag opening chuck 54,
As shown in FIGS. 6 and 7, after the article 94 as the article to be conveyed is stored, it is held only by the bag-opening conveyance chuck 52 and conveyed on the stage 56 in the direction indicated by the arrow X. In this case, the roller 2 is attached to the upper end of the partition plate 92 as a reversing guide for facilitating the opening of the bag 2 to the stage 56 side. Slid on 96 and moved to stage 56 side.

Next, FIGS. 8 to 10 show a specific configuration example of the rotary chuck 50A and the bag-opening transport chuck 52 and the opening operation thereof.

The rotary chuck 50A and the bag-opening transport chuck 52 have the same configuration, are provided with a pair of chuck pieces 98 and 100, and are provided with a support shaft 104 on a bearing 102 so as to be freely opened and closed. Chuck piece 9
Between the positions 8 and 100, a spring 106 is provided as a biasing means for biasing the chuck pieces 98 and 100 toward the bearing portion 102 in the closing direction.
8 are installed. The reversing arm 108 includes an arm piece 108A,
One end of 108B is rotatably attached to the chuck pieces 98 and 100, and the other end is connected with a reversing arm pin 109.

At the tip of each chuck piece 98, 100, the chuck piece 98, 1
Bend the end of 00 to the opposite side in a U-shape
A guide operation piece 112 is formed at the center of the chuck claw 110 on the chuck piece 98 side. The protruding width of the guide operation piece 112 is set between the opposed rotating chuck 50A and the bag opening transport chuck 5.
The arm pieces 108A and 108B are bent beyond the dead point of the second reversing arm 108, and the size is set so that the bag 2 can be gripped and guided between the chuck pieces 98 and 100. On one of the chuck jaws 110, an elastic body 114 such as rubber for generating friction having a constant width in a U-shaped cross section is provided, and the chuck jaws 110 on the guide operation piece 112 side are provided on the chuck jaws 110. An elastic body 114 is provided on a surface of the guide operation piece 112 facing the other chuck claw 110. Further, the rotary chuck 50A and the bag-opening conveyance chuck 52 are configured such that the respective guide operation pieces 112 are the chuck pieces 98, 1
The position is set so that it can be inserted between 00 and 00.

Therefore, when the rotary chuck 50A faces the back side of the hanging bag 2 held and suspended by the transfer member 42 or 44 located at the opening position Q, as shown in FIG. The bag-opening conveyance chuck 52 moves in the direction of the arrow T with the reverse rotation drive of the moving mechanism 66 with respect to the rotary chuck 50A. When the bag-opening transfer chuck 52 advances, as shown in FIG. 9 (C), the guide operation pieces 112 enter between the rotary chuck 50A and the bag-opening transfer chuck 52. 50A and bag 2 for bag-opening transport chuck 52
Is gripped at one end.

As shown in FIG. 9 (D), while the bag 2 is being gripped, the bag-opening transport chuck 52 is moved in the direction of the arrow U away from the rotary chuck 50A by the forward rotation of the moving mechanism 66, and the mutual guiding operation is performed. The piece 112 is the rotating chuck 50 on the opposite side.
A, detached from the bag opening transport chuck 52, the rotating chuck 50A,
Only one end of the bag 2 remains in the bag opening transport chuck 52, and the gripping state is maintained. At the same time, the rotary chuck 50A
As a result, the bag 2 is detached from the transfer members 42 and 44. The reason why the grip state of the bag 2 is maintained in this way is that the bag 2
For example, when formed of a synthetic resin sheet, since the surface is smooth, the coefficient of friction of the elastic body 114 on the chuck pawl 110 side is larger than the coefficient of friction between the guide operation pieces 112.

Then, when the bag opening transport chuck 52 is further moved in the direction of the arrow U, the insertion opening of the bag 2 is further opened as shown in FIG.

The structure and opening operation of the rotary chuck 50A and the bag opening transport chuck 52 are the same as those of the rotary chuck 50B and the bag opening chuck 54.

When the narrow bag 2 is opened, the rotating chuck 50C which grips one end thereof is rotated by the rotating chucks 50A, 50B.
11, and has a rotating mechanism 62 as shown in FIG.
The guide operation piece 116 corresponding to the rotary chuck 50C is installed on the frame 8 side. For this guide operation piece 116, the rotary chuck 50C
Is rotated, and the bag 2 faces the chuck surface, so that the guide operation piece 116 is inserted into the rotary chuck 50C together with the bag 2, and as a result, the bag 2 is
It will be gripped by C. That is, the rotary chuck 50C
Is a guide operation piece 116 instead of the facing bag-opening conveyance chuck.
, The grip for opening the bag 2 is performed.

As described above, since the bag 2 is always waiting at the standby position P by the transfer members 42 and 44, the bag opening operation is performed in comparison with the case where the bag 2 is supplied each time from the chucking area of the bag 2 according to the bag opening operation. , The response of the supply operation of the bag 2 is quickened, and the waiting time from the operation to the opening of the bag is reduced.

In the embodiment, in the transfer mechanism 24 of the supply mechanism 18,
Although the two transfer members 42 and 44 are configured to wait at the standby position P, a configuration may be employed in which a single transfer member is standby.

〔The invention's effect〕

According to the present invention, an object to be opened such as a bag formed of a flexible material such as a synthetic resin sheet can be easily and reliably opened, and the object to be opened is always waiting at a position near the bag opening side. Therefore, the operation response of the supply of the object to be opened to the bag opening operation can be promptly performed, and the waiting time from the bag opening operation to the opening can be shortened.

Further, according to the present invention, the opening object can be reliably held from the back side by the operation of rotating the first chuck with respect to the hanging object which is suspended by the supply means, and An object can be opened.

And according to this invention, it can open corresponding to the to-be-opened object from which a magnitude | size differs.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the opening device of the present invention, and FIG.
Fig. 3 is a perspective view of the opening device shown in Fig. 1, Fig. 3 is a plan view of a bag as an object to be opened, Fig. 4 is a diagram showing an opening operation by a first chuck and a second chuck, and Figs. FIGS. 6A and 6B are views showing an opening mode according to a difference in size of the bag 2, FIGS. 6 and 7 are views showing an operation of the opening apparatus shown in FIG.
8 to 10 are diagrams showing the structure and operation of first and second chucks in the opening device shown in FIG. 1,
FIG. 11 is a diagram showing a gripping operation of the first chuck in the opening device shown in FIG. 2 Bag (opening object) 18 Supply mechanism (supply means) 50A, 50B, 50C Rotary chuck (first chuck) 52 Open bag transporting chuck (second chuck) 54 Open Bag chuck

Continuation of front page (72) Inventor Takashi Nagata 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture ▲ High ▼ Inside Wood Industry Co., Ltd. (56) References JP-A-59-134102 (JP, A) JP-A-64- 48735 (JP, A) JP-A-53-796 (JP, A) JP-A-52-108289 (JP, A) JP-A-58-125105 (JP, U) JP-A-63-171310 (JP, U) JP-B-46-37480 (JP, B1) JP-B-51-42548 (JP, B2) JP-B-55-28934 (JP, B2) JP-B-55-36537 (JP, B2) JP-B 63-57282 (JP, B2) Jiko 62-17230 (JP, Y2)

Claims (3)

(57) [Claims] 1. An opening device for opening a bag formed of a flexible member such as a synthetic resin sheet or the like as an object to be opened, and storing means for storing the bags in a stacked state. A chucking mechanism for picking up one of the bags from the storage means and hanging the bag above the storage means; and gripping the hanging bag by the chucking mechanism to provide the chucking mechanism. A transfer means for receiving the bag from the opening position and transferring the bag to the opening position side, and when the transfer means is hanging the bag at the opening position side, a first chuck for gripping a part of the back side thereof, A second chuck that is provided opposite to the first chuck and sandwiches the bag, and grips a part of the front side of the bag; By increasing the distance between the first chuck second chuck,
An opening device, comprising: conveying means for opening the bag while being held by the first chuck and the second chuck. 2. The apparatus according to claim 1, wherein the first chuck is provided in a transfer path of the supply unit, and when the supply unit transfers the object to be opened, the first chuck temporarily retreats from the transfer path and passes the object to be opened. 2. The opening device according to claim 1, wherein the device returns after the transfer is completed and faces the back side of the object to be opened. 3. The opening device according to claim 1, wherein the first chuck includes a plurality of chucks having different gripping positions corresponding to the objects to be opened having different sizes.