Stand-up bag opening device with chuck

Abstract

To provide a bag opening device capable of instantaneously fully opening a chuck of a bag mouth of a stand-up bag with the chuck.SOLUTION: The self-weights of the suction members 01, the suction blocks 02, the fixed block 16, and the plate-shaped member 17 for sucking the stand-up bag 07 with a chuck are used as a force for pulling the suction members 01 obliquely rearward so as to draw a circle about the pivot 20 of the plate-shaped member 17, the lower surface of the bag mouth of the stand-up bag 07 with a chuck is widely opened, and the chuck of the bag mouth is instantaneously fully opened by using the downward movement of the opening bars 10 below the opening bars 10 as a trigger.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a zippered stand-up bag opening device that can automatically open a zippered stand-up bag whose mouth can be freely closed and opened. [Background technology]

[0002] Conventionally, manual bagging of zip-lock bags requires a great deal of skill to complete the entire process, from releasing the zipper at the opening of the zip-lock bag, which is supplied in a flat folded state, to inserting an item into the bag and closing the opening. A bagging device is known that can automate the bagging process, thereby enabling reliable and highly efficient bagging (see Patent Document 1).

[0003] The invention of Patent Document 1 "opens the bag mouth slightly with a pair of upper and lower suction cups, which are then moved and inserted into a pair of upper and lower insertion pieces, and the pair of upper and lower insertion pieces and pressing pieces clamp the bag mouths of the upper and lower pieces, spreading them up and down to forcibly open the bag; the bag adsorbed by the suction cups is moved to the position of the insertion pieces," which makes the opening process unstable and there is a risk of improper opening or poor clamping between the pair of upper and lower insertion pieces and pressing pieces. Therefore, the applicant invented the stand-up bag opening device with zipper that is described in Patent Document 2.

[0004] As shown in FIG. 11, the opening device for a stand-up bag with a zipper according to Patent Document 2 partially opens the opening 36 of the stand-up bag with a zipper 07 by the spring tension of the bellows suction cup 27 due to the weight of the suction cup block 26 that fixes the bellows suction cup 27 that sucks the stand-up bag with a zipper, rotates the bag mouth pressing piece 40 to press the upper part of the bag mouth opening, moves the opening bar 10 forward to a distance that reaches the zipper at the back of the bag mouth in the center of the opening of the stand-up bag with a zipper 07, and opens the lower opening bar 10 downward. As a result, the opening bar 10 and the fixed block (not shown) clamp the underside of the opening of the resealable stand-up bag 07, partially opening the center of the opening of the zipper, which triggers the weight of the suction cup block 26 and the spring contraction action of the bellows suction cup 27 to act simultaneously on the zipper, instantly opening the entire zipper of the resealable stand-up bag.This ensures a stable zipper opening operation and prevents the zipper from failing to open, resulting in a reliable and highly efficient bagging operation for articles. However, during humid seasons, the resealable stand-up bag 07 loses its stiffness, and as shown in Figure 12, the entire bag that is sucked in tends to take on a wavy shape, which causes distortion in the shape of the partial opening due to the spring tension action of the bellows suction cup 27 or narrows the width of the partial opening, creating a problem of preventing the insertion of the aforementioned opening bar 10 or the bag opening pressing piece 40 that presses down the top of the opening of the resealable stand-up bag 07 just before the opening bar 10 moves forward. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4693296 [Patent Document 2] Patent No. 6902294 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the object of the present invention is to provide a device for opening a stand-up bag with a zipper that can smoothly insert an opening bar into the partial opening of the stand-up bag with a zipper, without the shape and width of the partial opening of the opening of the stand-up bag being affected by humidity, temperature or room temperature. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the opening device for stand-up bags with closures of the present invention comprises a suction holder that suctions one stand-up bag with closure from a bag stocker and transfers it to the position of the bag opening holder; a suction cup member that is located under the opening of the stand-up bag with closure and cooperates with the suction holder to suction the underside of the opening to open the opening; and a pair of upper and lower spreader bars that penetrate into the zipper at the back of the entrance side of the opened opening of the stand-up bag with closures and open up and down to open the zipper. The suction cup members are mounted on suction cup blocks and are arranged in pairs on the left and right below the opening of the stand-up bag with closures of the closures of the bag. The suction cup block is pivotally attached to one end of a plate-like member having pivots at its upper and lower ends that can rotate 360 ​​degrees. The other end of the plate-like member is pivotally attached to the tip end surface of a guide rod. The guide rod is inserted into a holding hole of a guide frame and moves downward by its own weight. A boost cylinder is further provided to raise and lower a boost rod that abuts against the tip end surface of the guide rod to push it up. Furthermore, the spreading bars are lowered close to the article holder by the horizontal movement of the spreading cylinder block and the vertical movement of the spreading cylinder, and then advance until they reach the zipper at the back of the bag mouth entrance side in the center of the opening of the resealable stand-up bag, and by opening the spreading bar below the spreading bars downward, the center of the zipper opening is partially opened, and this triggers the suction cup members to act simultaneously due to the weight of the suction cup blocks and the bending of the plate-like member, thereby instantly opening the zipper of the resealable stand-up bag. The plate-like member is provided with pivots at the top and bottom ends that can rotate 360 ​​degrees, one of the pivots being pivotally attached to the suction block and the other being pivotally attached to the tip surface of the guide rod, and when the guide rod rises the plate-like member is bent and the suction block and the tip surface of the guide rod rise, and when the suction member of the suction block adsorbs the underside of the bag opening, the guide rod descends and the force pulling the suction block diagonally backward causes it to bend in an inverted V shape, increasing the opening angle of the bag opening. [Effects of the Invention]

[0008] In the resealable stand-up bag opening device of the present invention, the suction cup block and the tip of the guide rod are pivotally connected via plate-like members having pivots at the top and bottom that can rotate 360 ​​degrees. Therefore, compared to methods that partially open the opening by using the spring tension action of a bellows suction cup, the angle at which the partial opening at the mouth of the bag opens downward is significantly larger, and as a result the opening width is wider and a certain amount of opening space can always be secured. As a result, the bag mouth holder and / or spreader bar can be smoothly inserted into the partial opening. Therefore, even if the resealable stand-up bag loses its stiffness due to changes in humidity, temperature or room temperature and the entire bag that is sucked in becomes wavy, the resealable opening operation is stable and items can be packed into the bag reliably and with a high probability. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic side view of an overall stand-up bag opening device with a zipper according to the present invention; [Figure 2] 1 is an enlarged side view of a main portion of a stand-up bag opening device with a zipper according to the present invention. [Figure 3] FIG. 1 is a perspective view of the periphery of the opening of a stand-up bag with a zipper according to the present invention (1) before suction. [Figure 4] 1 is a front view of a structure for adhering a stand-up bag with a zipper from below using a suction cup member according to the present invention; [Figure 5] 1 is a side view of a structure for adhering a stand-up bag with a zipper from below using a suction cup member according to the present invention; [Figure 6]1 is a perspective view of the periphery of the opening of the stand-up bag with a zipper according to the present invention (2) during suction and before opening. FIG. [Figure 7] FIG. 10 is a comparison diagram of the opening angle at the bottom of the opening of the stand-up pouch with a zipper according to Patent Document 2 and the opening angle according to the present invention. [Figure 8] FIG. 1 is a perspective view of a stand-up bag with a zipper. [Figure 9] 1A is a front view of a stand-up bag with a zipper when the opening bar is inserted, when the zipper is just beginning to open, and when the zipper is fully open. [Figure 10] 1 is a perspective view of the periphery of the opening of the stand-up bag with a zipper according to the present invention during suction and after opening. FIG. [Figure 11] FIG. 1 is a diagram showing the overall configuration of a stand-up bag opening device with a zipper according to Patent Document 2. [Figure 12] FIG. 10 is a partially enlarged perspective view of a stand-up bag opening device with a zipper according to Patent Document 2. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a stand-up bag opening device with a zipper according to the present invention will be described below with reference to the accompanying drawings. The zippered stand-up bag opening device of the present invention can be realized with the same configuration as the zippered stand-up bag opening device of Patent Document 2, except for the structure around the suction cup member 01 and suction cup block 02 shown in Figure 1. As shown in the overall schematic side view of FIG. 1 , the zippered stand-up bag opening device of the present invention is configured to include an article supply conveyor 06, which is perpendicular to the direction of travel of the discharge conveyor 11 from the front to the back in the drawing, and which comprises a chain conveyor 05 carrying articles (not shown) on article holders 04 that slide forward and backward to the bag opening holding section 03; a bag stocker 08, which is arranged on the opposite side facing the article supply conveyor 06 with a space therebetween and which holds a number of zippered stand-up bags 07 that are folded flat; and a bag stocker 08, which is arranged in the space above the article supply conveyor 06 and which picks up one zippered stand-up bag 07 from the bag stocker 08 and places it in the position of the bag opening holding section 03. a suction holder 09 that transports the resealable stand-up bag 07 to the opening; suction cup members 01 that are positioned below the opening of the resealable stand-up bag 07 and work in cooperation with the suction holder 09 to adsorb to the opening underside and open the bag opening; a pair of upper and lower spreader bars 10 that advance up to the zipper at the back of the opening side of the opened opening and open up and down to partially open the zipper; a bag opening presser piece 40 that is positioned in the bag opening holding section 03 and rotates to press down the upper part of the bag opening; and a carry-out conveyor 11 that receives articles from the article holder 04 into the resealable stand-up bag 07 that has been fully opened by the spreader bars 10 and suction cup members 01, and transports the resealable stand-up bag 07 filled with articles to the next process.

[0011] As shown in the enlarged side view of the main part in FIG. 2, the suction holder 09 comprises a suction cylinder block 12 that moves in parallel from side to side along a cylinder block guide (not shown) that is hung horizontally above the machine frame, a suction cup 14 that is fixed to the suction cylinder block 12 via an extendable rod 13, and a pair of left and right suction pads 15 that are arranged in front of and behind the suction cup 14.

[0012] As shown in the perspective view of Fig. 3, the suction cup members 01 are fixed to suction cup blocks 02, and are provided in pairs on the left and right at positions below the front suction pads 15 that have been transported to the bag opening holding section 03, i.e., below the leading edge of the opening of the resealable stand bag 07, and a fixing block 16 (see Fig. 4) with rubber bumps on its surface is placed between the suction cup members 01. Figs. 4 and 5 show a structure including the suction cup members 01 and the suction cup blocks 02 for suctioning the resealable stand bag 07 from below with the suction cup members 01, Fig. 4 is a front view, and Fig. 5 is a side view of the right side of the front view of Fig. 4. 4 and 5 show a state in which the plate-like member 17 is placed parallel to the tip surface 19 of the guide rod 18 and is sandwiched from above by the suction block 02, while the right views of Fig. 4 and 5 show a state in which the plate-like member 17 is approximately perpendicular to the tip surface 19 of the guide rod 18 via a pivot 20. As shown in Fig. 4 and 5, the suction block 02 is pivotally attached via one pivot 20 of the plate-like member 17, which has pivots 20 at both ends that can rotate 360 ​​degrees, and the other pivot 20 of the plate-like member 17 is pivotally attached to the tip surface 19 of the guide rod 18, which is inserted into a holding hole 22 of a guide frame 21 and moves downward under its own weight. A push-up piece 25 attached to the tip of a push-up rod 24 of a push-up cylinder 23 is disposed below the center of the guide frame 21 between the holding holes 22, and the lower surface of the guide rod tip surface 19 is pushed up by the push-up piece 25 of the push-up cylinder 23, thereby causing the suction cup member 01 to be in close contact with the underside of the bag opening of the resealable stand-up bag 07. Thereafter, when the push-up cylinder 23 is contracted with the suction cup member 01 in close contact with the underside of the bag opening of the resealable stand-up bag 07, the suction cup block 02 falls down by its own weight along the holding holes 22, as shown in Figure 6, and opens the underside of the bag opening of the resealable stand-up bag 07. Regarding the position at which the plate-like member 17 is pivotally attached to each member, it is desirable that the suction block 02 be pivotally attached to the plate-like member 17 at its upper end on the bag opening side, and that the tip surface 19 of the guide rod 18 be pivotally attached at its lower end on the side away from the bag opening, so that the suction block 02 is tilted backward when viewed from the bag opening.

[0013] Here, in the invention of Patent Document 2, as shown in the left diagram of Figure 7, the upper surface of the suction block 26 is inclined obliquely toward the article supply conveyor, and the bellows suction cup 27 is also attached at an oblique angle, and the spring-like bellows suction cup 27 is brought into close contact with the underside 28 of the bag opening of the resealable stand-up bag 07 by expansion and contraction deformation, and the weight of the suction block 26 and the expansion and contraction deformation of the bellows suction cup 27 completely open the lower opening of the resealable stand-up bag 07. On the other hand, in the present invention, as shown in Figures 3 and 6, the suction cup member 01 can be brought into close contact perpendicularly with the underside of the bag opening of the resealable stand-up bag 07, providing more stable suction than the invention of Patent Document 2, which brings the suction member 01 into close contact at an angle, and reducing defects in this process. Furthermore, in the invention of Patent Document 2, the effect of the upper surface of the suction block 26 being inclined obliquely toward the article supply conveyor is to set the opening and closing angle 30 of the bag opening between the bag opening upper surface 29 and the bag opening lower surface 28 to the amount of the inclination of the upper surface, and although it is possible to make this angle larger, this leads to an increase in suction problems when the bellows suction cup 27 is adsorbed to the underside of the resealable stand bag 07. 7, the structure in which the tip surface 19 of the guide rod 18 and the suction block 02 are pivotally connected via one of the pivots 20 of a plate-like member 17, which has pivots 20 at both ends that can rotate 360 ​​degrees, pivots the lower end of the tip surface 19 of the guide rod 18, the side farther from the bag opening, via the pivot 20 provided at the upper end of the plate-like member 17. As a result, gravity acts in a circle centered on the pivot 20, and the weight of the suction member 01, suction block 02, fixed block 16, and plate-like member 17 pulls the suction member 01 diagonally backward, thereby enabling the opening and closing angle of the bag opening to be significantly greater than in the prior art. This prevents the problem of the opening width not being sufficient when the zippered stand-up bag becomes twisted due to moisture, etc.

[0014] As shown in FIG. 1, the spreading bars 10 are arranged above the article supply conveyor 06, and are provided with spreading cylinders 34 fixed via cylinder rods 33 to spreading cylinder blocks 32 which move in parallel left and right along spreading rods 31 hung horizontally above the machine frame. A pair of upper and lower spreading bars 10 extending toward the bag mouth opening side of the stand-up bags 07 with the upper side fixed and the lower side movable downwards and fixed via cylinder rods 35. As shown in FIG. 2, the spreading bars 10 are lowered close to the article holder 04 by the horizontal movement of the spreading cylinder block 32 and the vertical movement of the spreading cylinder 34, as indicated by the dashed line and the solid line, and then advance to a distance that reaches the zipper at the back of the bag mouth in the center of the opening of the resealable stand-up bag 07, and when the spreading bars 10 below the spreading bars 10 are lowered, the spreading bars 10 and the fixed block 16 clamp the underside of the opening 36 of the resealable stand-up bag 07, and the downward movement partially opens the zipper of the resealable stand-up bag 07, and the width of the spreading bars 10 may be narrow.

[0015] As shown in FIG. 1, one side of the discharge conveyor 11 is inclined toward the bag stocker 08 in the direction of travel, so that the bottom of the resealable stand-up bag 07 faces the bag stocker 08 and the opening of the resealable stand-up bag 07 with a zipper faces the article supply conveyor 06, and the articles filled in the resealable stand-up bag 07 are transported to the next process in an inclined state.

[0016] Next, the operation of the stand-up bag opening device with a zipper of the present invention will be described below with reference to the accompanying drawings. As shown in the perspective view of Figure 8, the stand-up bag with zipper 07 has an oval bottom 37 and curved side walls 38 so that it can stand on its own, and has a zipper 39 at the opening 36 that can be opened and closed freely. As shown in FIG. 1, a large number of these resealable stand-up bags 07 are stacked horizontally in a bag stocker 08 with their bottoms 37 folded. A suction holder 09 equipped with a pair of suction members 01 on the front, back, left, and right sides moves horizontally toward the bag stocker 08 and descends, suctioning the four corners of the topmost resealable stand-up bag 07 with suction pads 15. The holder then rises with the opening 30 at the front and moves parallel to the bag opening holder 03 above the discharge conveyor 10.

[0017] 3 and 6, when the bag opening holding portion 03 is in the position shown in FIG. 3, the lift rod 24 is raised by the lift cylinder 23, and the lift piece 25 fixed to the lift rod 24 is lifted, so that the suction cup member 01 is brought into close contact with the underside of the bag opening of the resealable stand bag 07 perpendicularly. Then, when the lift cylinder 23 is retracted with the suction cup member 01 in close contact with the underside of the bag opening of the resealable stand bag 07 as shown in FIG. 6, the suction block 02 falls by its own weight along the holding hole 22, and the weight of the suction member 01, the suction block 02, the fixed block 16, and the plate-like member 17 pulls the suction member 01 diagonally backward, drawing a circle around the pivot 20, widening the underside of the bag opening of the resealable stand bag 07 and maintaining the partially open state. In this state, the zipper 31 of the resealable stand bag 07 is still closed, and the zipper 39 is not yet open.

[0018] Next, as shown in Figures 3 and 6, the bag mouth pressing piece 40 is rotated downward to clamp and hold the top surface of the opening 36 of the zippered stand-up bag 07 together with the suction pad 15, as shown in Figure 9(a). The bag mouth pressing piece 40 is bifurcated, and can be rotated so as not to interfere with the opening bar 10, thereby pressing and clamping the front left and right suction pads 15 from below. As shown in FIG. 2, the expanding cylinder 34 is lowered by the expanding cylinder block 32 shown by the dashed line, and the expanding bar 10 is lowered to the position of the article holder 04, and then the expanding cylinder block 32 advances the expanding bar 10 to the position of the zipper 39 at the back of the opening 36 of the zippered stand bag 07.

[0019] 9(b), the lower spreader bar 10 is lowered so that the spreader bar 10 and the fixed block 16 pinch the underside of the opening 36 of the resealable stand bag 07. When the spreader bar 10 is further lowered, the central portion of the zipper 39 is partially opened, which triggers the weight of the suction cup member 01, the suction cup block 02, the fixed block 16, and the plate-like member 17 to act on the zipper 39, instantly completely opening the opening 39 of the resealable stand bag 07, as shown in FIGS. 9(c) and 10. Meanwhile, the spreader bar 10 is returned to the dashed line position shown in FIG. 2.

[0020] Thereafter, the article holder 04 shown in FIG. 2 is slid into the zippered stand bag 07, the suction cup member 01 stops suction to release the underside of the opening 36 of the zippered stand bag 07, the suction cup 14 holding the zippered stand bag 07 is lifted, the lower part of the zippered stand bag 07 is engaged with the article holder 04, and in this state the article in the article holder 04 is pushed out and inserted into the zippered stand bag 07, and the article holder 04 slides back to its initial position, leaving the article inside the zippered stand bag 07. When the storage of items into the stand-up bag 07 with a zipper is completed, the bag mouth pressing piece 40 is rotated in the reverse direction and returned to its original position, the suction of the suction pad 15 is stopped, and the filled stand-up bag 07 with a zipper is placed on the discharge conveyor 11 and transported to the next process.

[0021] In this way, the opening device for stand-up bags with zippers of the present invention utilizes the weight of the suction cup member 01, the suction cup block 02, the fixed block 16, and the plate-like member 17 that adsorb the stand-up bag with zippers 07 as a force pulling the suction cup member 01 diagonally backward in a circle around the pivot 20, widening the underside of the opening of the stand-up bag with zippers 07, and moving the spreader bars 10 forward until they reach the zipper 39 at the back of the opening of the stand-up bag with zippers 07 at the center of the opening 36, and opening the spreader bars 10 below the spreader bars 10 downward, thereby opening the spreader bars 10 and the fixed block 16. As a result, the underside of the opening 36 of the resealable stand bag 07 is pinched, the center of the opening 36 of the zipper 39 is partially opened, and this triggers the weight of the suction cup member 01, the suction cup block 02, the fixed block 16, and the plate-like member 17 to act simultaneously on the zipper 39, instantly opening the entire zipper 39 of the resealable stand bag 07. Therefore, even if the resealable stand bag loses its stiffness due to changes in humidity, temperature, or room temperature, and the entire bag that is sucked into it becomes wavy, the zipper opening operation is stable, and the bagging operation of articles can be carried out reliably and with a high probability. [Explanation of symbols]

[0022] 01 Suction cup material 02 Suction cup block 03 Bag opening holder 04 Item holder 05 Chain conveyor 06 Goods supply conveyor 07 Zippered Stand-Up Bag 08 Bag Stocker 09 Suction holder 10 Expansion bar 11. Discharge conveyor 12. Adsorption cylinder block 13 Rod 14 Suction cup 15 suction pads 16 Fixed Blocks 17 Plate-shaped members 18 Guide rod 19 Suction Cup Block 20 Axis 21 Guide frame 22 Retaining hole 23 Push-up cylinder 24 Push-up rod 25 Push up piece 26 Suction Cup Block 27 Bellows sucker 28 Lower side of bag mouth 29 Top of bag opening 30 Bag opening angle 31 Expansion rod 32 Expanded cylinder block 33 Cylinder rod 34 Expanding cylinder 35 Cylinder rod 36 Opening 37 Bottom 38 Side wall 39 Zipper 40 Bag opening holder

Claims

1. The device comprises a suction holder that sucks up one resealable stand-up bag from a bag stocker and transfers it to the bag opening holding section position; a suction cup member that is located on the underside of the opening of the resealable stand-up bag and cooperates with the suction holder to suck up to the underside of the opening to open the opening; and a pair of upper and lower spreader bars that penetrate into the zipper at the back of the entrance side of the opened opening of the resealable stand-up bag and open up and down to open the zipper. The suction cup members are provided on a suction cup block, and are arranged in pairs on the left and right below the opening of the stand-up bag with a zipper, a suction block pivotally attached to one end of a plate-like member having pivots at the top and bottom ends that can rotate 360 ​​degrees, the other end of the plate-like member pivotally attached to the tip end surface of a guide rod, the guide rod being inserted into a retaining hole in a guide frame and allowing it to fall under its own weight, and a push-up cylinder is further provided for raising and lowering a push-up rod that abuts against the tip end surface of the guide rod and pushes it up.

2. 2. The opening device for stand-up bags with zippers according to claim 1, wherein the spreader bars are lowered close to the article holder by the horizontal movement of the spreader cylinder blocks and the vertical movement of the spreader cylinders, and then advance to a distance where they can reach the zipper at the back of the bag mouth entrance side in the center of the opening of the stand-up bag with zippers, and by opening the spreader bar below the spreader bars downward, the center of the opening of the zipper is partially opened, which triggers the weight of the suction cup blocks and the bending of the plate-like member to act simultaneously on the suction cup members, instantly opening the zipper of the stand-up bag with zippers.

3. 2. A stand-up bag opening device with a zipper as claimed in claim 1, wherein the plate-like member is provided with pivots at its upper and lower ends that can rotate 360 ​​degrees, one of the pivots being pivotally attached to the suction cup block and the other being pivotally attached to the tip end surface of the guide rod, and when the guide rod is raised the plate-like member is bent so that the suction cup block and the tip end surface of the guide rod rise, and when the suction member of the suction cup block adsorbs the underside of the bag opening, the guide rod is lowered and pulls the suction cup block diagonally backward, causing it to bend in an inverted V shape, thereby increasing the opening angle of the bag opening.

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