Packaging machine

Abstract

To provide a packaging machine having short cycle time and high work efficiency.SOLUTION: A packaging machine 10 includes a grip mechanism 20 that grips a bag H in an opened state at one side and a charge mechanism 50 that inputs a work-piece W into the bag H gripped by the grip mechanism 20. The charge mechanism 50 comprises an elevation shaft 52 that is driven to ascend / descend by an elevation drive source 51, a work-piece input part 53 that ascends / descends in one body with the elevation shaft 52, and an opening auxiliary part 54 that is provided with an auxiliary claw 541 to enter the interior of the bag H earlier than the work-piece input part 53 to lock in the opening of the bag H. The elevation shaft 52 is provided with a lock member 521 configured to support the opening auxiliary part 54 from below and to be detached from the opening auxiliary part 54. The opening auxiliary part 54 is provided with a stop mechanism 543 that stops the opening auxiliary part 54 from descending at a height the auxiliary claw 541 enters the bag H.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a packaging machine that opens a supplied bag, puts a desired work into the bag, and then seals the bag. [Background technology]

[0002] Conventionally, as shown in Prior Art Documents 1 and 2, there is known a packaging machine having a gripping mechanism that grips a bag, a workpiece insertion unit that inserts a workpiece into the bag gripped by the gripping mechanism, and an opening assist unit that enters the bag before the workpiece insertion unit and holds the opening of the bag. In such a packaging machine, a drive source for the opening assist mechanism that moves the opening assist mechanism and a drive source for the workpiece insertion unit are separately provided, and the drive source for the workpiece insertion unit is driven after the opening assist mechanism is moved to a predetermined position where it can be engaged with the opening of the bag. This allows the workpiece and the workpiece insertion unit to pass through the opening of the bag, which is held sufficiently open by the opening assist mechanism, and prevents the workpiece from being engaged with the bag during the passage. This prevents the bag from falling off the gripping mechanism when the workpiece is inserted, and provides features such as stable workpiece insertion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-126208 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-055670 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional packaging machines have separate drive sources for the auxiliary claws and the workpieces, which means that when a workpiece is inserted, it is necessary to provide a waiting time for each to prevent interference between the moving parts, resulting in a longer cycle time. [Means for solving the problem]

[0005] The present invention has been made in view of the above-mentioned problems, and aims to provide a packaging machine that can shorten cycle time. To achieve this aim, the present invention provides a packaging machine that has a gripping mechanism that grips bags with one side open, and a filling mechanism that puts works into the bags gripped by the gripping mechanism, the filling mechanism having an elevating shaft that is driven by an elevating drive source to move up and down, a work input section that moves up and down integrally with the elevating shaft, and an opening auxiliary section that is provided with an auxiliary claw that enters the bag before the work input section and engages with the opening of the bag, and the elevating shaft is provided with a locking member that is capable of supporting the opening auxiliary section from below and is configured to be detachable from the opening auxiliary section, The opening assisting portion is raised and lowered by the support of the locking member, and the opening assisting portion is interlocked with the lifting shaft, The opening auxiliary unit is characterized by being provided with a stop mechanism that stops the descent of the opening auxiliary unit at a height at which the auxiliary jaws enter the bag. It is preferable that the lifting drive source be an electric actuator. It is also preferable that the filling mechanism be equipped with a detection means for detecting the height of the opening auxiliary unit, and that the opening auxiliary unit have an auxiliary jaw opening / closing unit that opens and closes the auxiliary jaws based on a signal from the detection means. It is also preferable that the workpieces are flat and smaller than the bag, that the workpiece feeding unit be equipped with a feeding chuck that drives chuck jaws smaller than the workpieces to open and close, and that the filling mechanism be equipped with clamping jaws that clamp the workpieces from above the bag. It is also preferable that the workpiece feeding unit be equipped with multiple pairs of feeding chucks and a moving means that moves the feeding chuck so that one of the feeding chucks is positioned above the bag held by the gripping mechanism. [Effects of the Invention]

[0006] In the packaging machine of the present invention, both the opening auxiliary unit, which maintains the open state of the bag, and the workpiece insertion unit are configured to move up and down in conjunction with the lifting shaft. The positions of the opening auxiliary unit and the workpiece insertion unit can be controlled using a single lifting drive source for raising and lowering the lifting shaft. This eliminates the need for waiting for operations to prevent interference between moving parts, as in conventional packaging machines. As a result, there are advantages such as shorter cycle times. At the same time, the reduction in the number of drive sources that need to be controlled simplifies the configuration of the control unit, enabling relatively inexpensive manufacturing. Furthermore, the lifting drive source is an electric actuator, allowing for appropriate adjustment of the lifting speed, further shortening the cycle time. Furthermore, the auxiliary claws are driven to open and close based on signals from a detection means that detects the height of the opening auxiliary unit, thereby enabling stable bag opening. Furthermore, because the clamping claws clamp the workpiece inserted into the bag, the workpiece is prevented from falling out when the insertion chuck is removed from the bag, enabling stable insertion of even flat workpieces into the bag. Furthermore, the workpiece insertion section is equipped with multiple pairs of insertion chucks, which means that the next stage of workpieces can be prepared while the workpiece is being inserted into the bag, which has the advantage of further shortening the cycle time. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic plan view showing the structure of a packaging machine according to the present invention. [Figure 2] 2 is a schematic plan view showing the operation of transitioning from the state in FIG. 1 to the next state. [Figure 3] 1 is an enlarged, partially cutaway front view of a main portion showing the structure of a filling mechanism of a packaging machine according to the present invention. [Figure 4] 1 is an enlarged, partially cutaway side view of a main portion showing the structure of a filling mechanism of a packaging machine according to the present invention. [Figure 5] 4 is an enlarged, partially cutaway front view of a main portion showing the operation of transitioning from the state of FIG. 3 to the next state. [Figure 6] 5 is an enlarged, partially cutaway side view of a main part showing the operation of transitioning from the state of FIG. 4 to the next state. [Figure 7]FIG. 7 is an enlarged, partially cutaway side view of part A in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will now be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 10 denotes a packaging machine 10 that places predetermined workpieces W into rectangular bags H. As shown in FIG. 1, the packaging machine 10 includes a drive motor 12 fixed to a base 11 and a rotary table 13 that is driven by the drive motor 12 and can rotate intermittently. The rotary table 13 is also provided with a plurality of gripping mechanisms 20 that grip the bags H at predetermined intervals along the circumference. Also provided on the base 11, as shown in FIG. 1, are a bag feeder 30 that supplies bags H to a position where the gripping mechanisms 20 are stopped by the rotary table 13 for intermittent rotation, an opening mechanism 40 that opens the bags H, a filling mechanism 50 that places works W into the opened bags H, a sealing mechanism 70 that closes the openings of the bags H containing the works W, and a discharge chute 80 that discharges the bags H with their openings closed. The packaging machine 10 also includes a control unit (not shown), which controls the operation of each mechanism.

[0009] The bag H is a rectangular flat bag with one side that can be opened, and is set to a capacity that can store the work W inside. The bag H has a two-layer structure consisting of an outer layer made of aluminum and an inner layer made of polypropylene, an example of a thermoplastic resin, and is configured so that the polypropylene inner layer is welded when heated, making it possible to seal the heated area. The work W is a sheet-like member made up of multiple flat objects smaller than the bag H stacked on top of each other.

[0010] The gripping mechanism 20 has a pair of gripping claws 21, 21 that grip the side edges of the bag H, and these gripping claws 21, 21 are configured to be able to open and close when driven by a predetermined gripping claw opening and closing mechanism.

[0011] The bag supply device 30 includes a magazine 31 capable of storing the bags H. The magazine 31 is configured in a box shape that is open at the top, and inside it, a plurality of horizontally positioned bags H are stacked. A supply cylinder 32 is provided above the magazine 31, and a supply suction pad 33 is provided at the tip of the drive section of the supply cylinder 32. A supply suction means (not shown) is continuous with the supply suction pad 33, and when the supply suction means is activated, the bag H can be sucked and held on the supply suction pad 33. The supply cylinder 32 is configured to be rotatable 90 degrees around a horizontally extending rotation shaft 34 toward the gripping mechanism 20, and to be able to reciprocate the supply suction pad 33 toward the magazine 31 and the gripping mechanism 20. With this structure, supply suction pad 33 can be driven by supply cylinder 32 to reciprocate in a direction toward and away from rotation shaft 34 while suction-holding bag H, and can also be rotated by rotation shaft 34, allowing bag H to be delivered to gripping mechanism 20. When supply cylinder 32 rotates, bag H is turned 90 degrees from a horizontal position to a vertical position, and therefore, when it assumes the vertical position within magazine 31, the opening is aligned so that it faces upward.

[0012] The opening mechanism 40 is provided at approximately the same height as the gripping mechanism 20, and includes a pair of opening suction pads 41, 41 that abut against the front and back surfaces of the bag H gripped by the gripping claws 21, 21, respectively, and an opening drive unit (not shown) that drives the opening suction pads 41, 41 back and forth in a direction perpendicular to the bag H. An opening suction means (not shown) is continuous with the opening suction pad 41, and when this opening suction means is activated, the opening suction pad 41 can suction the bag H.

[0013] As shown in FIG. 3, the filling mechanism 50 includes an elevation drive source 51 whose movable portion can be driven to move up and down in the vertical direction, and an elevation shaft 52 connected to the movable portion of the elevation drive source 51. A workpiece insertion unit 53 and an opening assistant unit 54 are supported on the elevation shaft 52 above the path of movement of the bag H. The elevation drive source 51 is an electric actuator configured to adjust the stop position, descent speed, etc., and is connected to the control unit. The workpiece insertion unit 53 includes a rotation mechanism 531 fixed to the elevation shaft 52 and a guide shaft extending parallel thereto, and a rotating housing 534 that rotates when driven by the rotation mechanism 531. As shown in FIG. 4, the rotation mechanism 531 includes a rotary table 532, which is an example of a rotation drive source. A first gear 533 that rotates about the elevation shaft 52 is engaged with the drive shaft of the rotary table 532, and the rotating housing 534 is connected to the first gear 533. Therefore, the rotating casing 534 is driven by the rotary table 532 and rotates integrally therewith. Two second gears 535, 535 are installed inside the rotating casing 534 at an interval of 180 degrees in the circumferential direction, and feeding chucks 536, 536 that rotate integrally therewith are attached to the undersides of these second gears 535, 535. The feeding chuck 536 is composed of chuck jaws that grip the workpiece W and a chuck jaw opening / closing unit that drives the chuck jaws to open and close. The chuck jaws are configured to be smaller than the workpiece W so that the lower end of the gripped workpiece W protrudes from their lower ends.

[0014] Furthermore, a third gear 537 is fixed to the lifting shaft 52 at the same height as the second gear 535. This third gear 537 is configured to be engageable with the second gears 535, 535, and is configured to rotate the second gears 535, 535, which revolve around the lifting shaft 52 in response to the drive of the rotary table 532, about their respective axes. The third gear 537 and second gears 535, 535 are designed to rotate the second gears 535, 535 by a predetermined angle in accordance with the work supply mechanism 60, which will be described later, when the second gear 535 revolves in response to the drive of the rotary table 532; in this embodiment, the second gear 535 is designed to rotate half a revolution while the second gear 535 revolves one revolution around the lifting shaft 52.

[0015] In addition, the packaging machine 10 is provided with a work supply mechanism 60 positioned below one of the input chucks 536 when the other input chuck 536 reaches above the bag H held by the holding mechanism 20 in response to the drive of the rotary table 532. The work supply mechanism 60 has a second rotary table 61 and a second rotary drive unit (not shown) that rotates the second rotary table 61. Works W are placed on the second rotary table 61 at equal intervals in the circumferential direction. The second rotary table 61 is configured to intermittently rotate a predetermined angle when the input chuck 536 extracts a work W, causing the next work W to wait below the input chuck 536. Therefore, as shown in FIG. 6 , when one input chuck 536 and the work W held by it enter the inside of the bag H, the other input chuck 536 can hold the next work W placed on the work supply mechanism 60. Furthermore, as shown in Figures 1 and 2, the workpieces W are arranged along the radial direction of the second rotating table 61, which makes it possible to increase the number of workpieces W that can be placed on the second rotating table 61, thereby improving work efficiency.

[0016] The opening auxiliary unit 54 is supported from below by a set collar 521, which is an example of a locking member fixed to the lifting shaft 52, and has a pair of auxiliary claws 541, 541 that can be locked onto the upper edge of the bag H, and an auxiliary claw opening / closing unit 542 that moves the auxiliary claws 541, 541 back and forth in a direction perpendicular to the bag H. The auxiliary claws 541, 541 are made of plate material whose tips are bent downward, and are configured to move toward and away from each other when driven by the auxiliary claw opening / closing unit 542. The auxiliary claws 541, 541 are in a standby state with the auxiliary claws 541, 541 close to each other, as indicated by the two-dot chain line in FIG. 7 , and are configured to move away from each other after the auxiliary claws 541, 541 enter the bag H. This allows the spread auxiliary claws 541 to lock onto the upper edge of the bag H, keeping the opening of the bag H sufficiently wide and uniform. Therefore, when the workpiece W is inserted as described below, the insertion chuck 536 entering the bag H and the workpiece W are prevented from coming into contact with the bag H.

[0017] Furthermore, a countershaft 543 extending parallel to the lifting shaft 52 is fixed to the underside of the opening auxiliary part 54, and an abutment member 55 is fixed to the base 11 on the extension of the countershaft 543. The countershaft 543 and the abutment member 55 are designed to have a predetermined length dimension so that the opening auxiliary part 54 stops at a height that allows the tips of the auxiliary claws 541, 541 to enter the bag H. With this structure, the opening auxiliary part 54 moves up and down integrally in conjunction with the lifting and lowering shaft 52 until the countershaft 543 abuts against the abutment member 55, and stops when the countershaft 543 abuts against the abutment member 55. Furthermore, a dog 544 is attached to the countershaft 543, and the filling mechanism 50 is equipped with proximity sensors 561, 562, which are an example of a detection means for detecting the dog 544. The proximity sensors 561, 562 are arranged with a predetermined gap between them in the vertical direction, with the upper proximity sensor 561 being installed at a height that allows it to detect the dog 544 when the opening auxiliary portion 54 is pushed up by the set collar 521 as shown in Fig. 3, and the lower proximity sensor 562 being installed at a height that allows it to detect the dog 544 when the countershaft 543 is in contact with the contact member 55 as shown in Fig. 5. Therefore, the height of the dog 544 and the opening auxiliary portion 54 linked thereto can be detected based on signals from the proximity sensors 561, 562.

[0018] Furthermore, the filling mechanism 50 is provided with a pair of clamping claws 571, 571 arranged below the transfer path of the bag H as a slip-out prevention mechanism for preventing the workpiece W from slipping out, and a clamping claw opening / closing unit 572 that drives the clamping claws 571, 571 to open and close in a direction perpendicular to the bag H. The clamping claws 571, 571 are configured to clamp only the workpiece W from above the bag H, and are installed so that their tips grip the portion protruding from below the feeding chuck 536.

[0019] The sealing mechanism 70 is composed of a pair of heater members 71, 71 arranged to clamp the area near the opening of the bag H, and a sealing drive unit (not shown) that drives the heater members 71, 71 back and forth in a direction perpendicular to the bag H, and the heater members 71, 71 are configured to heat the bag H to a temperature at which it can be welded when they come into contact with the front and back surfaces of the bag H.

[0020] The discharge chute 80 is made up of a hollow tubular member having a sufficient size for the bags H, and is disposed so that its upper open end is positioned below the path through which the bags H move.

[0021] Next, the operation of the packaging machine 10 configured as above will be described. When a drive signal is input, the control unit activates the gripper claw opening / closing mechanism, opening the gripper claws 21. When the gripper claws 21 are opened, the bag supply device 30 is driven to extract one bag H from the magazine 31 and supply it to the gripper claws 21. When the bag H is supplied, the gripper claw opening / closing mechanism operates in the reverse direction to close the gripper claws 21. As a result, both side edges of the bag H are gripped by the gripper claws 21. When the bag H is gripped by the gripping mechanism 20 in this manner, the control unit stops driving the supply suction means and reversely drives the supply cylinder 32 to lower the supply suction pad 33. As a result, the supply suction pad 33 disengages from the bag H and moves backward, and then descends toward the next, uppermost bag H in the magazine 31. When the supply suction pad 33 is separated from the bag H in this way, the control unit rotates the turntable 13 to move the gripping mechanism 20 and the bag H toward the opening mechanism 40.

[0022] When the gripping claws 21, 21 reach a position opposite the opening mechanism 40, the control unit stops the turntable 13 and drives the opening drive unit to move the opening suction pads 41, 41 closer to each other. When the approaching opening suction pads 41, 41 come into contact with the front and back surfaces of the bag H, respectively, the control unit drives the opening suction means and again drives the opening drive unit to move the opening suction pads 41, 41 away from each other. As a result, the front and back surfaces of the bag H are pulled in different directions, opening the bag H. When the bag H is opened, the control unit stops the opening suction means and removes the opening suction pads 41, 41 from the bag H. When the opening suction pads 41, 41 are removed from the bag H, the control unit rotates the turntable 13 again to move the gripping mechanism 20 and the bag H toward the filling mechanism 50.

[0023] When the gripping jaws 21, 21 and bag H reach below the opening auxiliary part 54 of the filling mechanism 50, the control unit stops the rotation of the rotary table 13 and drives the lifting drive source 51 to lower the lifting shaft 52 and the workpiece insertion part 53 and opening auxiliary part 54, which are linked thereto. After that, when the opening auxiliary part 54 descends to a predetermined height, the countershaft 543 abuts against the abutment member 55, stopping its descent. At the same time, the lower proximity sensor 562 detects the dog 544 fixed to the countershaft 543 and outputs a detection signal to the control unit. Upon receiving the detection signal, the control unit drives the auxiliary jaw opening / closing part 542 of the opening auxiliary part 54 to separate the auxiliary jaws 541, 541. As a result, the auxiliary jaws 541, 541 engage with the opening of the bag H, as shown in FIG. 7. Thereafter, when the lifting drive source 51 further lowers the lifting shaft 52, the set collar 521 disengages from the opening auxiliary portion 54, and the loading chuck 536 of the workpiece loading unit 53, which is lowered in conjunction with the lifting shaft 52, and the workpiece W held by the loading chuck 536 pass between the auxiliary claws 541 and enter the bag H. At this time, as described above, the opening auxiliary portion 54 holds the bag H in an open state, making it difficult for the entering workpiece W and loading chuck 536 to come into contact with the inner surface of the bag H, preventing the bag H from coming off the gripping mechanism 20 due to such contact. In this way, the single lifting drive source 51 can lift and lower both the workpiece loading unit 53 and the opening auxiliary portion 54, eliminating the need for multiple drive sources. As a result, there is no longer a need for a so-called operation waiting time, as in conventional packaging machines, during which each drive unit is temporarily stopped to prevent a collision between the workpiece loading unit 53 and the opening auxiliary portion 54, improving the cycle time. At the same time, since the positions of the workpiece insertion section 53 and the opening auxiliary section 54 can be controlled with a single lifting drive source 51, the configuration of the control section can be simplified, resulting in advantages such as low manufacturing costs.

[0024] As described above, when the feeding chuck 536 and workpiece W enter the bag H, the clamping jaw opening / closing unit 572 is driven, and the clamping jaws 571, 571 clamp the workpiece W from above the bag H. Thereafter, the chuck jaw opening / closing unit is driven in reverse to open the feeding chuck 536, and the lifting drive source 51 is driven in reverse to raise the lifting shaft 52 and the workpiece feeding unit 53. At this time, the workpiece W is held by the clamping jaws 571, 571, preventing it from slipping out of the bag H together with the feeding chuck 536. For this reason, even a flat workpiece W can be stably fed into the bag H. Thereafter, the set collar 521 of the lifting shaft 52 abuts against the opening auxiliary unit 54, returning the opening auxiliary unit 54 and the workpiece feeding unit 53 to their original heights. During this return, as the opening auxiliary part 54 rises and the dog 544 escapes from the detection range of the lower proximity sensor 562, the control part determines that the workpiece insertion part 53 has risen sufficiently relative to the opening auxiliary part 54 and that the insertion chuck 536 has come out of the auxiliary claws 541, 541, and drives the auxiliary claw opening / closing part 542 to bring the auxiliary claws 541, 541 closer together again.

[0025] Furthermore, as described above, while one of the feeding chucks 536 is feeding a workpiece W into a bag H, the other feeding chuck 536 is gripping the workpiece W in the next stage on the second rotary table 61 of the work supply mechanism 60. In this way, while one feeding chuck 536 is feeding a workpiece W, the other feeding chuck 536 can receive the workpiece W in the next stage. Therefore, there is no need to take a separate step of receiving the workpiece W in the next stage after feeding the workpiece W, thereby shortening the cycle time. Furthermore, when the lifting shaft 52 rises to the top, the control unit drives the rotary table 13 to move the bag H toward the sealing mechanism 70 and rotates the rotary table 532 and the second rotary table 61 by a predetermined angle. As a result, the feeding chucks 536 are switched in position, and the feeding chuck 536 is placed in standby above the workpiece W in the next stage.

[0026] When the gripping claws 21, 21 reach below the sealing mechanism 70, the control unit stops the turntable 13 and drives the sealing drive unit to bring the heater members 71, 71 closer together. As the heater members 71, 71 approach each other in this manner, they come into contact with the front and back surfaces of the bag H, respectively, and the vicinity of the opening of the bag H is welded by the heat of the heater members 71, 71. After welding, the control unit double-acts the sealing drive unit to move the heater members 71, 71 away from the front and back surfaces of the bag H and rotates the turntable 13 again, moving the gripping mechanism 20 and the bag H toward the discharge chute 80. When the gripping claws 21, 21 reach above the discharge chute 80, the control unit stops the turntable 13 and drives the gripping claw opening and closing mechanism to open the gripping claws 21, 21, and drop the bag H into the discharge chute 80. Thereafter, the control unit rotates the rotary table 13 again, and moves the gripping mechanism 20 toward the bag supply device 30 to receive the next bag H.

[0027] The packaging machine 10 according to the present invention is not limited to the above-described configuration and may be modified in various ways without departing from the spirit of the invention. For example, the filling mechanism 50 is not limited to packaging machines configured to transfer bags H as the rotary table 13 rotates, as in the packaging machine 10 described above. It may also be applied to packaging machines with other configurations, such as a packaging machine (not shown) that opens bags H and inserts workpieces at the position where the bag feeder 30 supplies the bags H (as shown in Patent Document 1). Furthermore, the countershaft 543 is an example of a stopping mechanism that stops the opening auxiliary part 54 at a predetermined height where the auxiliary claws 541, 541 enter the bags H. As long as the opening auxiliary part 54 can be stopped at the aforementioned height, other configurations are acceptable. Similarly, the planetary gear mechanism including the rotary table 532 and the first gear 533 to the third gear 537 is an example of a moving means for moving the feeding chuck 536. It is acceptable to move the feeding chuck 536 using a rotational drive source such as a motor. Furthermore, since the lifting drive source 51 is an electric actuator configured so that the stop position and descent speed can be adjusted, it is possible to adjust the speed appropriately, for example, by descending at high speed until the auxiliary claw 541 enters the bag H and then descending at a low speed, making it possible to insert the work W quickly and safely.

[0028] The filling mechanism 50 may also be provided with a biasing means for biasing the opening auxiliary portion 54 toward the bag H. This makes it possible to move the opening auxiliary portion 54 toward the bag H even in a packaging machine such as the packaging machine 10 in which the opening auxiliary portion 54 cannot move toward the bag H under its own weight, thereby making it possible to apply the filling mechanism 50. Furthermore, there is no problem even if multiple pairs of the auxiliary claws 541, 541 are provided, and there is no problem even if the auxiliary claws are configured to expand in a direction parallel to the bag in accordance with the work. [Explanation of symbols]

[0029] 10 … Packaging machine 13... Rotating table 20 … Gripping mechanism 30 … Bag feeding device 40 … Opening mechanism 50 … Filling mechanism 51 ... Lift drive source 52 ... Elevating axis 521...Locking member 53 ... Workpiece insertion section 54 ... Opening auxiliary part 541... Auxiliary claw 60 ... Work supply mechanism 70 … Sealing mechanism 80 ... Ejection chute

Claims

1. The bag has a gripping mechanism that grips a bag with one side open, and a filling mechanism that puts workpieces into the bag gripped by the gripping mechanism, The filling mechanism includes an elevation shaft that is driven by an elevation drive source and moves up and down; a workpiece insertion unit that moves up and down integrally with the lifting shaft; an opening assisting section provided with an auxiliary claw that enters the bag before the work input section and engages with the opening of the bag, The lifting shaft is provided with a locking member that is capable of supporting the opening auxiliary part from below and is configured to be detachable from the opening auxiliary part, and the opening auxiliary part is lifted and lowered by the support of the locking member, whereby the opening auxiliary part is interlocked with the lifting shaft, A packaging machine characterized in that the opening auxiliary section is provided with a stopping mechanism that stops the descent of the opening auxiliary section at a height at which the auxiliary claws enter the bag.

2. 2. The packaging machine according to claim 1, wherein the lifting drive source is an electric actuator.

3. The filling mechanism includes a detection means for detecting the height of the opening auxiliary portion, 3. The packaging machine according to claim 1, wherein the opening auxiliary section includes an auxiliary claw opening / closing section that opens and closes the auxiliary claw based on a signal from the detection means.

4. The workpiece is a flat body smaller than a bag, The workpiece insertion unit is provided with an insertion chuck that opens and closes chuck jaws that are smaller than the workpiece, 4. The packaging machine according to claim 1, wherein the filling mechanism has clamping claws for clamping the work from above the bag.

5. 5. A packaging machine according to claim 1, wherein the workpiece insertion section comprises a plurality of pairs of insertion chucks and a moving means for moving the insertion chucks so that one of the insertion chucks is positioned above the bag held by the holding mechanism.

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