Bag feeder

Abstract

To provide a bag feeder enabling, when a bundle of packaging bags is placed vertically in the bag feeder so that each bag opening faces downwards, a packaging bag at the tip end to reach a tip part of a magazine tray at first, eliminating the need to stack a bundle of packaging bags in vertical rows like dominoes, and realizing space saving.SOLUTION: In a packaging device sucking an upper face of each packaging bag 02 arranged at a tip part of a magazine tray 01 and moving the same to a carrying-in device, a bag feeder comprises: the magazine tray 01 with the tip part tilted downwards; a feed roller unit 06 moving the packaging bag 02 brought in contact with an endless belt 05 bridged over a columnar roller 14 arranged at a corner of a roughly triangular prism forward or downward; and an end member 08 having a wheel 07 at a bottom face, diagonally standing and holding each packaging bag 02, and extruding the same to the side of the feed roller unit 06 with loading. The bag feeder progresses each packaging bag 02 to the tip part of the magazine tray 01 while holding vertical rows like reverse dominoes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bag supply device for a packaging machine that can supply not only ordinary packaging bags but also packaging bags placed on a magazine tray, such as self-standing bags with double bottoms. [Background technology]

[0002] Conventionally, there are known bag feeding devices (Patent Document 1) that align and stack packaging bags and suck up the topmost packaging bag from above the packaging bags using a suction member attached to the end of an arm or the like, and bag feeding devices (Patent Document 2) that drop vertically aligned packaging bags one by one.

[0003] The bag feeding device disclosed in Patent Document 1 works fine for packaging bags of a uniform thickness, but because freestanding bags have a gusset that folds inward due to their wide-bottom structure, and the gusseted portion is twice as thick, the more bags there are, the more the stack of freestanding bags tilts with the gusseted portion facing up. Therefore, when feeding freestanding bags, the top freestanding bag being sucked in tilts when the multiple suction cups suck the packaging bags, and the angle of inclination varies from bag to bag. This causes problems with suction and makes it difficult to feed bags stably, even in devices that require the packaging bags to be horizontal. Next, the bag feeding device disclosed in Patent Document 2 requires the bags to be aligned upright, which creates the problem of not being able to drop packaging bags of different thicknesses one by one.

[0004] Bag feeding devices using belt conveyors and rollers are also known. For example, as shown in Patent Document 3, a common device is one in which the belt conveyor and rollers are spaced apart to match the thickness of a single packaging bag, and the bags are pushed forward one by one, and the pushed-out packaging bags are sucked up by a suction device and moved to a carry-in device. This type of device is also used as the bag feeding device for the self-standing bag packaging device shown in Figures 8 and 9. Furthermore, there is a device in which a stocker with a U-shaped cross section and an upwardly arcing shape for storing packaging bags is attached to a similar bag feeding device, so that a large number of packaging bags can be automatically packaged with a single setting (Patent Document 4).

[0005] However, both the bag feeding devices described in Patent Documents 3 and 4 are designed to feed packaging bags one by one between the belt conveyor and rollers. For example, if the gap between the belt conveyor and rollers is adjusted to match the thickness of the upper side of a self-standing bag whose bottom side is twice as thick, clogging is likely to occur due to the thick bottom side. On the other hand, if the gap is adjusted to match the thickness of the bottom side, the tightness of contact between the front side and the roller is weakened, resulting in insufficient feeding or the possibility of multiple self-standing bags getting caught at once. To prevent this, the invention described in Patent Document 3 solves the problem by stacking the self-standing bags vertically in a magazine tray in a domino-like fashion, with the openings facing forward and the double-layered bottoms facing backward, as shown in Figure 10, in preparation for feeding the self-standing bags one by one. However, arranging the self-standing bags in a domino-like fashion requires checking the overlap of each bag individually. To ensure reliable feeding, the bags must be arranged on the tray with a large non-overlapping area, resulting in the problem of requiring a large amount of space to load a large number of self-standing bags on the tray. One way to address this space issue is to provide a stocker, as in the invention described in Patent Document 4. However, when feeding bags of different thicknesses, such as freestanding bags, arranging them in an upward arc creates a problem of imbalance due to the increased weight of the thicker parts, and when feeding vertically long bags, arranging them in an arc at all becomes an issue. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2002-326609 A [Patent Document 2] Japanese Patent Application Publication No. 07-257763 [Patent Document 3] Patent No. 6978786 [Patent Document 4] Utility Model Registration No. 2603186 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the present invention aims to provide a bag supply device in which suction cups of a bag suction device are attached to the upper surfaces of packaging bags to be supplied to the tip of a magazine tray, and the packaging bags are moved to a conveying device, in which even when a stack of multiple packaging bags is pre-installed, the upper end of the packaging bag at the forefront of the stack can reach the tip of the magazine tray before the other packaging bags, and clogging is less likely to occur between the rollers and the magazine tray even when the packaging bags to be supplied are self-standing bags, eliminating the need to stack the packaging bags in a vertical row; and further, an object of the present invention is to provide a bag supply device that can install a large number of packaging bags at one time when pre-installing them, thereby saving space in the entire bag supply device. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the bag feeding device of the present invention is a U-shaped housing with an opening on the top surface, and is provided with a magazine tray that is installed in an inclined state with the leading end downward and the tail end upward, a roughly triangular feed roller unit that is made up of an inclined vertical portion on the obliquely standing bag side and an inclined horizontal portion that matches the inclination of the magazine tray, an endless belt made up of a toothed belt that is hung on cylindrical rollers located at the three corners of the roughly triangular feed roller unit and has the function of moving packaging bags that are in contact with the belt forward or downward, and a roller that has wheels or rollers on the bottom surface and a roller that holds packaging bags obliquely between the feed roller unit and the belt, and The magazine tray is provided with an end member having a shape or member capable of holding the packaging bag and having the function of pushing the tilted packaging bag from the rear of the magazine tray toward the feed roller unit by the weight of wheels or rollers, the gap between the bottom of the magazine tray and an endless belt laid approximately parallel to the bottom of the magazine tray is large enough to allow multiple packaging bags to pass through at the same time, the packaging bags are placed with their openings facing downward and their bag-shaped bottoms facing upward, and when multiple packaging bags are tilted, the multiple packaging bags are stacked vertically in an inverted domino effect and move toward the tip of the magazine tray by the rolling of the wheels or rollers. The magazine tray further includes an opening at the center of its bottom surface through which the belt conveyor is exposed, a belt conveyor that fits into the opening of the magazine tray, and that occupies a position from where a part of the packaging bag contacts the belt conveyor to behind the installation position of the feed roller unit when the leading end of the packaging bag is in contact with the front end of the magazine tray, and that has the function of moving the packaging bag placed on it forward, and a sensor switch that is installed at the front end of the magazine tray and is linked to the belt conveyor, and that has the function of moving the belt conveyor from rear to front and starting the movement of the packaging bag on the belt conveyor to the front of the magazine tray when it detects that the packaging bag has not contacted the front end of the magazine tray for a certain period of time. [Effects of the Invention]

[0009] The magazine tray of the bag feeding device of the present invention is installed in an inclined position with the front end downwards and the rear end upwards, has a bottom surface that is approximately the same width as the packaging bag, and is provided with upright magazine guides on both sides of its entire length, so that free-standing bags can be easily replenished or their sizes changed simply by replacing the magazine tray. The end members of the present invention install the magazine tray in an inclined position with the leading edge downward and the rear end upward, allowing wheels or rollers to push packaging bags from the rear of the magazine tray toward the feed roller unit by gravity. Furthermore, because the end members have a shape or components that can hold packaging bags at an angle between the feed roller unit and the end members, the packaging bags are tilted by the angle of the end members in addition to the angle of the magazine tray. When multiple packaging bags are bundled and placed, the bundle can easily be stacked vertically like an inverted domino, eliminating the need to arrange the packaging bags vertically. Furthermore, by tilting the packaging bags when they are pre-installed, a large number of bags can be installed at one time, thereby saving space in the bag feeding device.

[0010] The feed roller unit of the present invention is stretched over cylindrical rollers arranged at three corners of a T-shaped plate-like member, and includes an endless belt that is approximately parallel to the magazine tray and laid on the bottom side, and an endless belt that is laid on a side at the rear side, and the endless belts are interlocked so that, by circulating the endless belts, the bottom endless belt can feed packaging bags forward, and the side endless belts can feed packaging bags that are upright diagonally downward. The distance between the bottom of the magazine tray and the bottom endless belt is wide enough to allow multiple packaging bags to pass through, making clogging less likely even for self-standing bags. When multiple packaging bags are fed, the packaging bags are advanced by the bottom endless belt while maintaining a vertical stacked configuration like an inverted domino, so that the topmost packaging bag is the bag closest to the leading edge of the magazine tray, and by maintaining the vertical stacked configuration like an inverted domino, the packaging bag one level below can become the packaging bag closest to the leading edge. In addition, the distance between the endless belt on the bottom side and the bottom of the magazine tray can be adjusted to accommodate widths ranging from those that allow only one sheet to pass through to those that allow multiple sheets to pass through, further increasing versatility.

[0011] The belt conveyor of the present invention has an opening formed in the center of the bottom surface of the magazine tray through which the belt conveyor is exposed, and is fitted into the opening of the magazine tray, and when the leading edge of a packaging bag is in contact with the leading edge of the magazine tray, it occupies from the position where a portion of the packaging bag contacts the belt conveyor to behind the installation position of the feed roller unit, and has the function of moving the placed packaging bag forward, and the sensor switch of the present invention is installed at the leading edge of the magazine tray, and when the top edge of the packaging bag does not contact the leading edge of the magazine tray for a certain period of time, the sensor switch detects the non-contact and starts the belt conveyor, moving the belt conveyor from rear to front, The belt conveyor continues to run until the top edge of the uppermost packaging bag of the multiple packaging bags fed by the feed roller unit while maintaining the inverted domino-like vertical stack reaches the leading edge of the magazine tray, and has an auxiliary function in case the leading edge is not reached by the feed roller unit alone. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of a bag feeding device according to the present invention; [Figure 2] Enlarged perspective view of the magazine tray [Figure 3] Side view of the feed roller unit [Figure 4] Perspective view of the feed roller unit [Figure 5] A perspective view of a feed roller unit attached to a bag feeding device. [Figure 6] Perspective view of an end member consisting of three rollers [Figure 7] A diagram showing how to stack a stack of packaging bags in an inverted domino pattern [Figure 8] Side view of the entire self-standing bag packaging device of the prior art (Patent Document 3) [Figure 9] Side view of a conventional bag supply device (self-standing bag supply unit) (Patent Document 3) [Figure 10] Conventional method for setting self-standing bags (Patent Document 3) DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of a bag supply device according to the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the bag feeding device according to the present invention is intended for use in a packaging device in which suction cups 04 associated with a bag suction device 03 are attached to the upper surface of a packaging bag 02 located at the tip of a magazine tray 01, and the packaging bag 02 is moved to a device that conveys products into the packaging bag. The bag feeding device comprises a magazine tray 01, which is a path for moving the packaging bags 02 one by one to a position where they can be attached by the bag suction device 03, a feed roller unit 06 having the function of moving the packaging bags 02 in contact with an endless belt 05 forward or downward, and an end member 08 having wheels 07 on its bottom surface and a shape on its front surface that can hold the packaging bag 02 at an angle between it and the feed roller unit, and having the function of pushing the angled packaging bag 02 from the rear of the magazine tray 01 toward the feed roller unit 06.

[0014] About the magazine tray As shown in FIG. 2(a), the magazine tray 01 is a U-shaped housing with an opening on the top surface, a bottom surface 9 with approximately the same width as the packaging bags 02, and upright magazine guides 10 on both sides of the entire longitudinal direction. In the lateral direction, an upright guide is provided on the side corresponding to the leading end 11, but no guide is required on the side corresponding to the rearmost end 12. The magazine tray 01 is installed in an inclined position with the leading end 11 facing downward and the rearmost end 12 facing upward. The path of the packaging bags 02 on the magazine tray 01 proceeds from the rear, which is at a high position, toward the leading end 11, which is at a low position, until the upper end of the packaging bag 02 reaches the leading end 11 of the magazine tray 01. Of the packaging bags that have reached the leading end of the magazine tray, the uppermost packaging bag 02a is picked up one by one by a bag suction device 03. The angle of inclination of the magazine tray is preferably an angle at which an end member 08 (described later) can push forward the packaging bags 02b tilted in front of the end member 08 by means of the wheels 07, and at which the angle does not hinder the movement of the tilted packaging bags 02b in contact with the endless belts 05b on the sides to be sent diagonally downward. The rear magazine tray 13 is designed to be detachable, and the overall length of the magazine tray 01 can be adjusted by changing the length of the rear magazine tray 13 according to the number of packaging bags 02b.

[0015] About the shape of the feed roller unit 1, the feed roller unit 06 includes an endless belt 05a that is substantially parallel to the bottom surface of the magazine tray 01 and has the function of feeding forward the packaging bags 02 placed on the bottom side, and an endless belt 05b that has the function of feeding oblique packaging bags 02b placed on the rear side surface diagonally downward, and is a member that stretches the endless belt 05 over rollers 14 in the feed roller unit and moves the endless belt 05 by the rotation of the rollers 14. As shown in FIGS. 3 and 4, the shape of the feed roller unit 06 is substantially triangular, with cylindrical rollers 14 arranged at three corners of the triangle and fixed by T-shaped plate-like members 15, and the endless belt 05 is fitted into grooves 16 provided circumferentially around both ends and in the center of the roller 14, so that the endless belt 05 circulates in accordance with the rotation of the roller 14. The plate-like member 15 may be a single T-shaped plate, but the roughly triangular shape can be changed by separating the member and providing length adjustment screws 17 or the like, and the length per side of the endless belt 05a on the bottom surface and the endless belt 05b on the side surface can be adjusted depending on the shape and length of the packaging bag 02. The roughly triangular shape is not necessarily required, and any shape can be used, such as a square, as long as the shape allows the endless belts 05a and 05b on the bottom surface and side surface to perform their functions. Furthermore, the endless belt 05 is assumed to be a toothed belt made of a flexible material such as synthetic rubber, but is not limited to this as long as the belt has a shape or material that can feed out the packaging bag 02.

[0016] Fixing position of the feed roller unit on the magazine tray As shown in FIG. 5, the feed roller unit 06 is fixed to the frame of the packaging device or the like via a feed roller unit mounting shaft 18, and in order to rotate the rollers 14, a belt conveyor structure for driving the rollers may be provided as in the prior art of FIG. 8, or a structure may be provided in which the mounting shaft 18 passes through the rollers 14, and the rollers 14 are rotated by the direct rotation of the mounting shaft 18. Furthermore, the attachment position of the feed roller unit 06 on the magazine tray 01 is preferably a position where the uppermost packaging bag 02a is completely exposed so that the bag suction device 03 can perform the function of adsorbing the suction cup 04 to the upper surface a of the uppermost packaging bag 02 that contacts the tip end 11 of the magazine tray 01.

[0017] Distance between the feed roller unit and the magazine tray The gap between the bottom of the magazine tray 01 and the endless belt 05a on the bottom side is wide enough to allow multiple packaging bags to pass through at the same time. Therefore, when a stack of packaging bags 02 is pre-installed and fed, multiple packaging bags can be advanced simultaneously. As shown in FIG. 1, if the pre-installed stack of packaging bags is vertically stacked in an inverted domino shape, the leading edge of the stack of packaging bags 02 first contacts the endless belt 5b on the side of the feed roller unit, which is hung on the inclined vertical portion of the feed roller unit, and is fed diagonally downward toward the endless belt 05a on the bottom side. Next, the second bag contacts the empty space left by the first bag and is fed continuously. Therefore, multiple packaging bags 02 passing through the endless belt 05a on the bottom side are stacked in a domino shape. Then, when the packaging bags 02 are fed out by the endless belt 05a on the bottom side while maintaining this state, the uppermost packaging bag 02a becomes the packaging bag 02 closest to the leading end 11 of the magazine tray 01. Furthermore, as the multiple packaging bags 02 passing between the bottom of the magazine tray 01 and the endless belt 05a on the bottom side continue to maintain an inverted domino-like stacked state, after the uppermost packaging bag 02a has been sucked by the bag suction device 03, the packaging bag 02 below becomes the packaging bag 02 closest to the leading end 11. Furthermore, if the gap between the bottom of the magazine tray 01 and the endless belt 05a on the bottom side is set wide enough to always allow multiple bags to pass through, there is a risk that it will not be possible to feed just one bag. Therefore, the gap is set to the width of one bag under normal conditions, and a mechanism is provided in which the feed roller unit 06 moves forward or upward by the thickness of multiple packaging bags and then returns to its original position. This makes it possible to feed all the packaging bags 02 placed in the bag feeding device down to the last one, and also prevents the packaging bags 02 from clogging when feeding the bags by widening the range of movement of the feed roller unit 06.

[0018] End members The end member 08 has a function of tilting the packaging bag 02b between itself and the feed roller unit 06, and a function of pushing the tilted packaging bag 02b from the rear of the magazine tray 01 toward the feed roller unit 06. As for the shape, as shown in Fig. 1, a shape having an inclined surface on the front surface is desirable, but it does not necessarily have to be a flat surface as long as it has a structure that can stably tilt the packaging bag 02b. For example, as shown in Fig. 6, three rollers can be connected by a plate-like member to make the packaging bag tiltable, and the combination of two rollers that come into contact with the bottom surface 09 of the magazine tray can be changed depending on the length and shape of the packaging bag, so the inclination angle of the front surface can be changed. Next, regarding the method of pushing the tilted packaging bag 02b from the rear of the magazine tray 01 toward the feed roller unit 06, since the magazine tray 01 is tilted, the tilted packaging bag 02b can be pushed toward the feed roller unit 06 by gravity alone using the wheels 07 or rollers on the bottom of the end member 08, but there is no limit to the method as long as it is a means that has the function of pushing the packaging bag 02b forward with an appropriate force, such as a mechanically controlled method.

[0019] How to create a vertically stacked reverse domino structure As mentioned above, to solve the problem with this device, the stack of packaging bags that has been placed in advance must be stacked vertically in an inverted domino shape, which can be achieved by inclining the magazine tray 01 and the front surface of the end member 08. Figure 7 compares the shapes of the stack of packaging bags that have been placed in advance in cases (a) and (b) where the magazine tray has the same inclination 21 but the inclination angle of the front surface of the end member 08 is different. 7(a) shows a case where the slope 19a of the front surface of the end member is perpendicular to the horizontal plane, while FIG. 7(b) shows a case where the slope 19b of the front surface of the end member is tilted rearward from perpendicular to the horizontal plane. The stack 20a of packaging bags in (a) can be stacked vertically in an inverted domino shape at the angle of the magazine tray slope 21, even when the slope 19a of the front surface of the end member is perpendicular to the horizontal plane. However, the stack 20b of packaging bags in (b) can be stacked vertically in an inverted domino shape with a steeper slope than that in (a) because the slope 19b of the front surface of the end member is added to the slope 21 of the magazine tray. When the stack of packaging bags is stacked vertically in an inverted domino shape with a steeper slope, as in (b), the risk of the lower packaging bag 02 reaching the leading edge 11 of the magazine tray 01 before the upper packaging bag 02 can be further reduced, which leads to the uppermost packaging bag being kept closest to the leading edge. On the other hand, it is also possible to make the inclination 21 of the magazine tray horizontal and increase the inclination 19 of the front surface of the end member, but in this case the packaging bags 02 would be placed in a state close to lying down, and the number that can be placed at one time would be reduced. Therefore, with the structure of this device, a larger number of packaging bags can be placed at one time when they are pre-placed, thereby realizing space savings in the bag feeding device.

[0020] Next, another embodiment of the bag supply device according to the present invention will be described below with reference to the accompanying drawings. As shown in Figures 1 and 2(b), this device has a magazine tray of the bag feeding device according to claim 1, in which an opening 23 is formed in the center of the bottom surface 09 so as to surround the belt conveyor 22 so that the belt conveyor 22, which is stretched over a drive shaft and a driven shaft, is exposed, and the bottom surface 09 is further extended forward to protrude beyond the belt conveyor 22. The belt conveyor 22 is fitted into the opening 23 of the magazine tray, and occupies a range from the position where the bottoms of the packaging bags 02 contact the belt conveyor 22 to the rear of the installation position of the feed belt unit 06, with the openings of the packaging bags 02 stacked vertically in an inverted domino shape contacting the front end 11 of the magazine tray, and has the added function of moving the placed packaging bags 02 forward, and the function of the belt conveyor 22 is controlled by a sensor switch installed at the front end of the magazine tray.

[0021] The function of the sensor switch 24 is to detect the non-contact by the sensor switch 24 when the upper end of the packaging bag 02 is not in contact with the leading edge 11 of the magazine tray 01, and to start the belt conveyor 22 to move the belt conveyor 22 from rear to front, since if the upper end of the packaging bag 02 is not in contact with the leading edge 11 of the magazine tray 01, the suction cups 04 will not be attracted to the correct position even if the bag suction device 03 is activated.The belt conveyor 22 continues to operate until the upper end of the uppermost packaging bag 02a of the plurality of packaging bags 02 fed by the feed roller unit 06 while maintaining the inverted domino-like vertical stack reaches the leading edge 11 of the magazine tray 01, thereby fulfilling a supplementary function in the case where the feeding roller unit 06 alone does not reach the leading edge 11 of the magazine tray 01. Furthermore, since the belt conveyor 22 is positioned so as not to come into contact with the topmost packaging bag 02a, it is possible that only packaging bags 02 other than the topmost packaging bag 02a move even when the belt conveyor 22 is operating. As shown in Figure 5, a push plate 25 is attached to the front of the feed roller unit 06, and the push plate 25 clamps the topmost packaging bag 02a and the packaging bag 02 in contact with the belt conveyor 22, thereby allowing all of the clamped packaging bags to move forward.

[0022] Next, the operation of another embodiment of the bag supply device according to the present invention will be described below with reference to the drawings. First, as shown in Figure 1, an operator places the stack of packaging bags 02 on the magazine tray 01 behind the feed roller unit 06 with the bag openings facing down and obliquely facing the end member 08. Next, the roller 14 of the feed roller unit 06 is rotated clockwise, and the packaging bag 02 at the forefront of the stack of packaging bags is fed diagonally downward by the endless belt 05b on the side, and then moved forward by the endless belt 05a on the bottom. When the stack of packaging bags 02 is placed on the magazine tray 01, it is already stacked vertically like an inverted domino, and following the forefront packaging bag 02, the following packaging bags 02 are fed downward or forward one after another by the feed roller unit 06. The gap between the bottom surfaces of the magazine trays and the endless belts 05a on the bottom surfaces is large enough to allow multiple packaging bags to pass through, so the multiple packaging bags 02 advance in a vertically stacked fashion like an inverted domino, and when the top end of the top packaging bag 02a reaches the front end 11 of the magazine tray, the bag suction device 03 is activated and the top packaging bag 02a is sucked by the suction cups 04 and sent to the feeder. Once the top packaging bag 02a has been sucked, the packaging bag 02 below it becomes the new topmost packaging bag 02a, and when it similarly reaches the front end 11 of the magazine tray, the bag suction device 03 is activated and the topmost packaging bag 02a is sucked by the suction cups 04 and sent to the feeder. Due to this flow, the stack of packaging bags 02 is sent downward or forward one after another by the feed roller unit 06, so that the thickness of the stack of packaging bags 02 gradually becomes thinner, and the end member 08 pushes the stack of packaging bags 02 from the rear of the magazine tray 01 toward the feed roller unit 06 by means of the wheel 07, and the stack of packaging bags 02 is all fed. Furthermore, during the above operation, if the upper end of the uppermost packaging bag 02a is unable to reach the front end of the magazine tray by the feed roller unit 06, the sensor switch 24 provided at the front end 11 of the magazine tray detects that the upper end of the packaging bag 02 has not contacted the sensor switch 24 for a certain period of time, starts the belt conveyor 22, moves the belt conveyor 22 from rear to front, and advances all of the multiple packaging bags 02 that are stacked vertically in an inverted domino shape and pass between the bottom surface of the magazine tray and the endless belt 05a on the bottom surface. The belt conveyor 22 continues to run until the upper end of the uppermost packaging bag 02a reaches the front end 11 of the magazine tray 01, and when the upper end of the uppermost packaging bag 02a reaches the front end 11 of the magazine tray 01, the bag suction device 03 is activated, and the uppermost packaging bag 02a is sucked by suction cups 04 and sent to the carry-in device. [Explanation of symbols]

[0023] 01 Magazine tray 02 Packaging bag 03 Bag suction device 04 Sucker 05 Endless Belt 05a Endless belt on the bottom 05b Endless belt on the side 06 Feed roller unit 07 Wheels 08 End member 09 Bottom of magazine tray 10 Magazine Guide 11 Tip of magazine tray 12 Rear end of magazine tray 13 Rear magazine tray 14 Roller 15 Plate-like member 16 Roller groove 17 Length adjustment screw 18 Feed roller unit mounting shaft 19a Slope of the front surface of the end member in Figure 6(a) 19b Slope of the front surface of the end member in Figure 6(b) 20a Bundle of packaging bags as shown in Figure 6(a) 20b Bundle of packaging bags as shown in Figure 6(b) 21 Magazine tray tilt 22 Conveyor Belt 23 Magazine tray opening 24 Sensor Switch 25 Push plate

Claims

1. a U-shaped housing having an opening on the top surface, and a magazine tray that is installed in an inclined state with the leading end downward and the rear end upward; a substantially triangular feed roller unit consisting of an inclined vertical portion on the obliquely standing bag side and an inclined horizontal portion that matches the inclination of the magazine tray; an endless belt made of a toothed belt that is stretched over cylindrical rollers arranged at three corners of the approximately triangular feed roller unit and has a function of moving packaging bags in contact with the belt forward or downward; The bottom surface of the magazine tray has wheels or rollers, and the front surface of the magazine tray has a shape or member that can hold the packaging bag in an oblique position between the magazine tray and a feed roller unit, and the magazine tray has an end member that has a function of pushing the obliquely positioned packaging bag from the rear of the magazine tray toward the feed roller unit by the weight of the wheels or rollers. The gap between the bottom surface of the magazine tray and the endless belt laid substantially parallel to the bottom surface of the magazine tray is such that a plurality of packaging bags can pass through at the same time, The packaging bag is placed with the opening facing downward and the bag-shaped bottom facing upward, and when multiple packaging bags are tilted, the multiple packaging bags are stacked vertically in an inverted domino effect and move toward the tip of the magazine tray by rolling on wheels or rollers.

2. an opening formed in the center of the bottom surface of the magazine tray through which the belt conveyor is exposed, the belt conveyor being fitted into the opening of the magazine tray, and occupying a position from where a part of the packaging bag contacts the belt conveyor to behind the installation position of the feed roller unit with the leading end of the packaging bag contacting the leading end of the magazine tray, and having the function of moving the packaging bag placed thereon forward; 2. The bag feeding device according to claim 1, further comprising a sensor switch that is installed at the tip of the magazine tray, that is linked to the belt conveyor, and that has the function of moving the belt conveyor from rear to front when it detects that the packaging bag has not come into contact with the tip of the magazine tray for a certain period of time, thereby starting the movement of the packaging bag on the belt conveyor toward the front of the magazine tray.

Images