Packaging Machine

Abstract

To provide a packaging machine in which wrinkles and scratches are less likely to occur in bags when opened.SOLUTION: A packaging machine 10 of the invention is equipped with a gripping unit 20 for gripping a predetermined bag, and an opening unit 30 for opening the bag gripped by the gripping unit 20, wherein the gripping unit 20 is equipped with a pair of gripping jaws 26 that grip the two side edges of the bag H respectively, and a swivel mechanism 21 that moves the gripping jaws 26 reciprocally in the approaching and separating directions respectively. This allows the gripping jaws, which grip the edges of the bag, to move in a reciprocating swivel, resulting in wrinkles, scratches, etc. around the bag's gripping points being less likely to occur.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Conventionally, a packaging machine that puts parts and the like into a predetermined bag is known, as disclosed in Patent Document 1. This packaging machine has a gripping unit that grips a given bag that is supplied, and an opening unit that opens the bag gripped by the gripping unit, and is configured to put works into the bag that opens at a predetermined position by these. In such a packaging machine, the gripping unit has a pair of gripping claws 26', 26' that grip both side edges of the bag H, as shown in Fig. 7(a), and these gripping claws 26', 26' are configured to approach each other as the opening unit opens the bag H, as shown in Fig. 7(b). Therefore, when the bag H is opened, the opening is not strained, and it is possible to open it smoothly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5913992 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional packaging machines, as shown in Figure 6(b), gripping claws 26' that grip bag H are configured to approach the bottom of bag H in parallel. As a result, when a bag that is relatively difficult to deform, such as a metal bag such as aluminum or a bag with a zipper, is opened, a bend H4 occurs at the boundary between the part that is gripped by gripping claws 26' and in a vertical state and the part that is located further down than that part and inclined with respect to corner H1 of the bottom. If this bend H4 remains as a wrinkle or scratch, there is a problem that bag H becomes a defective product. [Means for solving the problem]

[0005] The present invention has been created in view of the above problems, and has an object to provide a packaging machine that is less likely to cause wrinkles or scratches on bags. To achieve this object, the present invention is characterized in that it comprises a gripping unit that grips a specified bag, and an opening unit that opens the bag gripped by the gripping unit, and the gripping unit has a pair of gripping claws that grip the edge of the bag, and a rotating mechanism that reciprocates the gripping claws in directions approaching and separating from each other. It is preferable that the gripping claws rotate about a specified corner of the bag. It is also preferable that the rotating mechanism has a support shaft that extends in a direction perpendicular to the bag, and a rotating rod that rotates about the support shaft, and that the gripping claws are each supported by the rotating rod of the rotating mechanism. Further, it is preferable that the arm portions extending toward the other support shaft are fixed to the support shafts, a connecting member is provided at the tip of one arm portion, and a long hole extending in the longitudinal direction of the other arm portion is formed, and the connecting member is inserted into the long hole so as to be movable and rotatable. Foundation The rotating table is preferably provided with a supply unit that supplies bags to the gripping unit, an opening unit that opens the bag supplied by the supply unit, an input unit that inputs a desired workpiece into the bag opened by the opening unit, and a sealing unit that seals the opening of the bag into which the workpiece has been input, and the supply unit, opening unit, input unit, and input unit are preferably arranged on a path of movement of the gripping unit caused by the rotation of the turntable.Furthermore, the base is preferably provided with an abutment portion that always abuts against the connecting member, and the abutment portion has a middle step portion and a lower step portion that is configured lower than the middle step portion, the middle step portion is provided at a position where it abuts against the connecting member of the gripping unit facing the supply unit, and the lower step portion is provided at a position where it abuts against the connecting member of the gripping unit facing the opening unit and the input unit. Effect of the Invention

[0006] The packaging machine of the present invention has an advantage that the gripping claws that grip the edge of the bag rotate back and forth, so that the bag does not bend when it is opened, and wrinkles and scratches are less likely to occur on the bag. In addition, when the gripping claws rotate around the corner of the bag, the gripping points of the bag by the gripping claws rotate while maintaining a constant distance from the corner, so that wrinkles and scratches are less likely to occur. In addition, since the pivot mechanism has a support shaft and a rotating rod and the gripping claws are supported by the rotating rod, it is possible to accommodate bags of various shapes by replacing the rotating rod. Furthermore, the rotation of the pair of support shafts and gripping claws is synchronized by the arm portion and the connecting member that connects the arm portion, so that the bent shape of the bag can be made to be approximately the same every time, and there is an advantage that the accuracy of the parts insertion operation after the opening operation is improved. In addition, since a plurality of gripping units are installed at predetermined angles on the rotating table, and the supply unit, opening unit, insertion unit, and sealing unit are arranged on the movement path of the gripping units, different operations can be performed on a plurality of bags, which has the advantage of improving the cycle time, etc. Furthermore, since the gripping claws have an abutment portion that is always in abutment with the connecting member, and the abutment portion has a stepped shape having a middle step and a lower step, it has the advantage that the gripping claws can be rotated without providing a separate drive source. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic plan view showing a structure of a packaging machine according to the present invention. [Diagram 2] 2 is a schematic plan view showing the operation of transitioning from the state shown in FIG. 1 to the next state. FIG. [Diagram 3] 1A is a plan view showing a state in which the gripping jaws are closed, and FIG. 1B is a plan view showing a state in which the gripping jaws are open. FIG. [Figure 4] 1A and 1B are exploded views showing the operation of the gripping section of the packaging machine according to the present invention, and from the left are a rear view showing the state in which the connecting member abuts against the middle section, a rear view showing the state in which the connecting member abuts against the lower section, and a rear view showing the state in which the connecting member abuts against the upper section. [Diagram 5]FIG. 2 is a development view showing the operation of the gripping part when the packaging machine of the present invention grips a bag with a zipper, and from the left is a rear view showing the state where the connecting member abuts the middle portion, and a rear view showing the state where the connecting member abuts the lower portion. [Figure 6] 1A and 1B are schematic diagrams showing the deformation of a bag due to the movement of the gripping part of a packaging machine according to the present invention, in which (a) is a schematic front view showing the shape of the bag before deformation, and (b) is a schematic front view showing the shape of the bag when the gripping part approaches while rotating. [Figure 7] 1A and 1B are schematic diagrams showing deformation of a bag due to movement of the gripping part of a conventional packaging machine, in which (a) is a schematic front view showing the shape of the bag before deformation, and (b) is a schematic front view showing the shape of the bag when the gripping jaws approach each other in parallel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1 and Fig. 2, 10 denotes a packaging machine that puts predetermined parts (not shown) into rectangular bags H. As shown in Fig. 1, this packaging machine 10 includes a drive motor 12 fixed on a base 11 and a rotary table 13 that can rotate intermittently by being driven by the drive motor 12. Furthermore, on the rotary table 13, a plurality of gripping units 20 that grip the bags H are provided at predetermined intervals along the circumferential direction, and on the base 11, as shown in Fig. 1, there are provided a supply unit 30 that supplies bags H to a position where the gripping unit 20 is stopped by the rotary table 13 for intermittent rotation, an opening unit 40 that opens the bags H, an input unit 50 that puts desired parts into the opened bags H, a sealing unit 60 that closes the opening of the bags H containing the parts, and a discharge unit 70 that discharges the bags H with the openings closed. Furthermore, the packaging machine 10 includes a control unit (not shown), and the drive of each unit is controlled by this control unit.

[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 parts inside. The bag H has a two-layer structure consisting of an outer layer made of aluminum and an inner layer made of polypropylene, which is an example of a thermoplastic resin, and is configured so that the polypropylene inner layer is welded by heating, making it possible to seal the heated area.

[0010] As shown in Fig. 3(a), the gripping unit 20 has a pair of left and right swivel mechanisms 21, 21 and a pair of gripping claws 26, 26 supported by the swivel mechanisms 21, 21, respectively. The swivel mechanism 21 has a support block 22 fixed to the rotary table 13, a spindle 23 rotatably inserted through the support block 22, and a rotating rod 24 fixed to the radially outer end of the spindle 23 of the rotary table 13. The rotating rod 24 is set to extend vertically upward from the spindle 23, and the gripping claws 26 are fixed to the upper end thereof. Therefore, the gripping claws 26 can rotate along a predetermined arc centered on the spindle 23. 4, the radially inner end of the support shaft 23 of the rotary table 13 is provided with arms 25a and 25b extending toward the other support shaft 23, and a connecting member 250 consisting of a shaft 251 and a cam follower 252 is attached to the tip of one arm 25a, and an elongated hole 25b1 is formed at the tip of the other arm 25b for holding the shaft 251 of the connecting member 250 rotatably and movably in the longitudinal direction of the arm 25. For this reason, as shown in FIG. 4, when the connecting member 250 descends from the initial height, both support shafts 23 rotate in a direction that brings the upper sides of the rotating rod 24 closer to each other, and when the connecting member 250 rises from the initial height, both support shafts 23 rotate in a direction that moves the upper sides of the rotating rod 24 away from each other.

[0011] Further, the base 11 is formed with an abutment portion 14 below the rotary table 13, which extends along the moving path of the connecting member 250 and always abuts against the cam follower 252 of the connecting member 250. The abutment portion 14 is configured in a stepped shape having a middle stage portion 141 that supports the connecting member 250 at a predetermined height where the rotating rod 24 is vertical, a lower stage portion 142 provided below the middle stage portion 141, and an upper stage portion 143 provided above the middle stage portion 141. As shown in FIG. 1 and FIG. 2, the lower stage portion 142 is provided at a position opposite to the opening unit 40 and the feeding unit 50, while the upper stage portion 143 is provided at a position opposite to the sealing unit 60. With these, when the gripping unit 20 moves due to the rotational drive of the rotary table 13, the connecting member 250 moves up and down while moving along the abutment portion 14 as shown in FIG. 4. As the connecting member 250 moves up and down, the support shaft 23 and the rotating rod 24 rotate, and the gripping unit 20 turns in conjunction with the rotating rod. A tension spring 241 is provided between the pair of rotating rods 24, and this tension spring 241 constantly biases the upper sides of the rotating rods 24 in a direction to bring them closer together. The connecting member 250 is constantly biased downward by this tension spring 241, and is pressed against the abutment portion 14.

[0012] The gripping claws 26 are fixed to the rotating rod 24 and have a fixed claw 261 extending parallel to the support shaft 23, and an opening / closing claw 262 that opens and closes with respect to the fixed claw 261. The opening / closing claw 262 is configured to rotate around a set screw 263 penetrating the fixed claw 261, and a connecting shaft 27 is fixed to the end on the side away from the fixed claw 261. The connecting shaft 27 has rotary bearings on both ends, and an opening / closing operation unit 28 is connected to the end on the opposite side to the fixed claw 261. The opening / closing operation unit 28 is a rod material configured to be rotatable around a second set screw 281 penetrating the fixed claw 261, and an engagement unit 282 made of a rotary bearing is provided at the end on the opposite side to the connection shaft 27. For this reason, by moving the engagement unit 282 radially outward of the rotating table 13 as shown in FIG. 3(b), the opening / closing operation unit 28 rotates and the connecting shaft 27 is drawn inward in the radial direction of the rotating table 13. As a result, the opening / closing claw 262 pulled by the connecting shaft 27 is rotationally driven in a direction away from the fixed claw 261. In addition, a closing spring 29 is attached to the end of the opening / closing operation unit 28 on the connecting shaft 27 side. This closing spring 29 biases the connecting shaft 27 toward the outside in the radial direction of the rotary table 13 as shown in Fig. 3(a), and biases the opening / closing claw 262 in a direction to always close.

[0013] Further, on the base 11, an opening / closing cylinder 15 is provided as an example of an opening / closing drive source for driving the gripping claws 26, 26 to open and close. As shown in Figs. 1 and 2, the opening / closing cylinder 15 is disposed at a position where the gripping unit 20 faces the supply unit 30 and the discharge unit 70, and an engagement plate 16 capable of engaging with the engagement portion 282 and biasing the engagement portion 282 radially outward of the rotary table 13 is fixed to a movable portion of the opening / closing cylinder 15. As a result, when the opening / closing cylinder 15 is driven, the engagement plate 16 biases the engagement portion 282 radially outward of the rotary table 13. As a result, the opening / closing operation portion 28 rotates, whereby the opening / closing claws 262 rotate in a direction away from the fixed claw 261, and the gripping claws 26 open.

[0014] The supply unit 30 includes a magazine 31 capable of storing the bags H. The magazine 31 is configured in a box shape that opens upward, and a plurality of horizontally oriented bags H are stacked inside the magazine 31. A supply cylinder 32 is provided above the magazine 31, and a supply suction pad 33 is provided at the tip of a drive section of the supply cylinder 32. A supply suction means (not shown) is connected to the supply suction pad 33, and the supply suction means is activated to suck and hold the bags H 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 unit 20, and to be capable of reciprocating the supply suction pad 33 toward the magazine 31 and the gripping unit 20. With these structures, the supply suction pad 33 can reciprocate toward and away from the rotating shaft 34 by the drive of the supply cylinder 32 while suctioning and holding the bag H, and can rotate by the drive of the rotating shaft 34 to deliver the bag H to the gripping unit 20. The supply unit 20 is configured to be able to supply the bag H at a predetermined height so that the bottom corner H1 of the bag H is positioned on an extension of the rotation axis of the support shaft 23 of the gripping unit 20. Furthermore, since the bag H is turned 90 degrees from a horizontal position to a vertical position when the supply cylinder 32 rotates, the opening of the bag H is aligned so as to face upwards within the magazine 31 when it assumes the vertical position.

[0015] The opening unit 40 is provided at approximately the same height as the gripping unit 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 26, 26, respectively, and an opening drive section (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 the opening suction means is activated, the opening suction pad 41 is able to suck the bag H.

[0016] The feeding unit 50 is composed of a feeding chute 51 provided above the gripping unit 20, and a feeding drive section (not shown) for raising and lowering the feeding chute 51. An external parts supply device (not shown) is connected to the upper side of the feeding chute 51, and is configured to be able to supply any number of parts supplied from the parts supply device into the bag H.

[0017] The sealing unit 60 is composed of a pair of heater members 61, 61 arranged to clamp the area near the opening of the bag H, and a sealing drive unit (not shown) that drives the heater members 61, 61 back and forth in a direction perpendicular to the bag H, and the heater members 61, 61 are constantly heated to a temperature at which the bag H can be welded.

[0018] The discharge unit 70 is composed of a hollow tubular member having a sufficient width for the bag H, and is disposed so that its upper open end is positioned below the bag H held by the holding unit 20.

[0019] Next, the operation of the packaging machine 10 configured as above will be described. When a drive signal is input, the control unit operates the opening / closing cylinder 15, and moves the engagement portion 282 of the gripping unit 20 facing the supply unit 30 radially outward of the turntable 13. As a result, the opening / closing claws 262 rotate in a direction away from the fixed claws 261, and the gripping claws 26 are opened. When the gripping claws 26 are opened, the supply unit 30 is driven to extract one bag H from the magazine 31 and supply it to the gripping claws 26. When the bag H is supplied, the opening / closing cylinder 15 operates in the reverse direction. As a result, the opening / closing claws 262 rotate toward the fixed claws 261 by the drive of the closing spring 29, and the gripping claws 26 are closed. Therefore, the bag H is supported in a suspended state with both side edges of the bag H gripped by the gripping claws 26, as shown in FIG. 6(a). At this time, the connecting member 250 is in contact with the middle stage 141 of the contact portion 14, and the rotating rod 24 is facing vertically. When the bag H is gripped by the gripping claws 26, the control unit rotates the turntable 13 to move the gripping unit 20 and the bag H toward the opening unit 40. At this time, as the gripping unit 20 moves from the supply unit 30 toward the opening unit 40, the connecting member 250 gradually moves down from the middle stage 141 to the lower stage 142 of the contact portion 14. In conjunction with this, the rotating rod 24 and the gripping claws 26 gradually tilt in a direction in which their upper sides approach each other, as shown in (b) of FIG. 6. Therefore, as shown in FIG. 4, the opening of the bag H gripped by the gripping claws 26 gradually bends. At this time, the gripping claws 26 are structured to tilt while rotating around the support shaft 23, and are arranged so that the bottom corner H1 of the bag H is located on the extension of the rotation axis of the support shaft 23, so that the gripping point of the bag H gripped by the gripping claws 26 moves in an arc shape centered around the vicinity of the bottom corner H1. Therefore, even if the gripping claws 26, 26 approach each other, bending H4 does not occur in the bag H, as in the conventional packaging machine shown in Figure 7(b). As a result, even if the bag is made of a relatively hard metal such as aluminum, wrinkles or scratches do not occur between the gripping point and the bottom corner H1, and the bag can be smoothly bent.

[0020] When the gripping claws 26 reach a position opposite to the opening unit 40, the control unit stops the rotary table 13 and drives the opening drive unit to bring the opening suction pads 41, 41 closer to each other. When the opening suction pads 41, 41 that have come closer to each other 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 to open the bag H. At this time, since the opening of the bag H is bent as described above, the bag H can be opened smoothly. As a result, the opening suction pads 41, 41 are prevented from coming off the bag H during the opening, preventing the bag H from being fully opened. 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 released from the bag H, the control unit rotates the turntable 13 again and moves the gripping unit 20 and the bag H toward the insertion unit 50.

[0021] When the gripping claws 26 reach below the feeding unit 50, the control unit stops the rotary table 13 and drives the feeding drive unit to insert the feeding chute 51 into the opening of the bag H. When the feeding chute 51 is inserted into the bag H, the component supply device is driven to feed the components into the bag H. When a predetermined amount of components are fed, the control unit doubles the feeding drive source to remove the feeding chute 51 from the bag H and rotates the rotary table 13 again to move the gripping unit 20 and the bag H toward the sealing unit 60. At this time, as the gripping unit 20 moves from the feeding unit 50 toward the sealing unit 60, the connecting member 250 moves from the low lower stage 142 of the abutting portion 14 to the high upper stage 143 and gradually rises. Therefore, in conjunction with the connecting member 250, the rotating rod 24 and the gripping claws 26 gradually incline in a direction in which their upper sides move away from each other. Therefore, the opening of the bag H gripped by the gripping claws 26 gradually expands as shown in FIG. 4. After that, when the moving gripping claws 26 reach below the sealing unit 60, the control unit stops the rotary table 13 and drives the sealing drive unit to bring the heater members 61, 61 closer to each other. The heater members 61, 61 approach each other in this way and 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 61, 61. At this time, since the opening of the bag H is taut as described above, bending, wrinkles, etc. are not formed at the sealed portion. In particular, by inclining the bag H so that the upper side opens, the opening can be taut even if the bag H is displaced from the initial position of the gripping claws 26 when parts are inserted, etc., and defects such as bending and wrinkles are less likely to occur in the sealed bag H. After that, the control unit double-acts the sealing drive unit to move the heater members 61, 61 away from the front and back surfaces of the bag H, and rotates the rotary table 13 again to move the gripping unit 20 and the bag H toward the discharge unit 70. When the gripping claws 26 reach above the discharge unit 70, the control unit stops the turntable 13 and drives the opening / closing cylinder 15 to move the engaging portion 282 radially outward of the turntable 13. This opens the gripping claws 26 and drops the bag H into the discharge unit 70. The control unit then rotates the turntable 13 again and moves the gripping unit 20 toward the supply unit 30 to receive the next bag H.As the gripping unit 20 moves from the discharge unit 70 toward the supply unit 30, the connecting member 250 gradually descends from the upper stage 143 of the abutting portion 14 to the middle stage 141 and returns to the initial height.

[0022] Since the structure is such that, during the above-mentioned driving, the connecting member 250 slides along the abutment portion 14, causing the gripping claws 26 to rotate about the support shaft 23, there is no need to provide a separate drive source for driving the gripping claws 26 to rotate in addition to the rotation drive source for rotating the turntable 13, and therefore the structure of the control unit can be simplified. Also, since the opening / closing cylinder 15 for driving the gripping claws 26 to open and close is disposed on the base 11, there is no need to dispose a drive source on the turntable 13. With such a structure in which a drive source is not disposed on the turntable 13, the gripping claws 26 can be opened, closed, and rotated during the rotation drive without getting tangled in electric wiring, air piping, etc.

[0023] The packaging machine 10 according to the present invention is not limited to the above, and various modifications are possible within the scope of the invention. For example, the contact portion 14 may be provided with a lifting cylinder (not shown) that gradually lowers the connecting member 250 as the opening unit 40 opens the bag H when the gripping unit 20 faces the opening unit 40. The opening / closing cylinder 15 may also be disposed at a position where the gripping unit 20 faces the opening unit 40. In this case, it is preferable that a defective discharge portion (not shown) is provided around the opening / closing cylinder 15, and when the bag H is not opened by the opening unit 40 even after the opening / closing operation is performed a predetermined number of times or more, the bag H is determined to be defective and discharged to the defective discharge portion. Therefore, the opening operation is not performed continuously on the defective bag H, and the operation can be performed efficiently. Furthermore, the configuration in which the gripping claws 26 for gripping the bags H, which is an essential part of the present invention, are driven to reciprocate can be applied to any packaging machine that includes a gripping unit 20 for gripping a predetermined bag H and an opening unit 40 for opening the bag H gripped by the gripping unit 20, and is not limited to the configuration in which the bags H are rotated and conveyed by the turntable 13 as in the packaging machine 10 described above, and there is no problem even if it is applied to packaging machines of other configurations. Of course, there is no problem even if the opening unit 40, the feeding unit 50, the sealing unit 60, and the discharging unit 70 are changed to those of other configurations. Moreover, by changing the rotating rod 24, bags of different lengths can be easily accommodated, and by changing the interval between the support blocks 22, bags of different sizes can be easily accommodated.

[0024] In the above embodiment, the bag H is a rectangular flat bag with an opening on one side at the top, and is supplied so that the bottom corner H1 is located on the extension of the support shaft 23, but bags of other shapes may be used. For example, when parts are put into a chuck-equipped bag H' having a chuck H2 that is relatively difficult to deform as shown in FIG. 5, by arranging the corner H3 of the chuck H2 on the extension of the support shaft 23, the gripping claws 26 can rotate around the corner H3 of the chuck H2, making it difficult for the bag to be scratched. When opening a bag other than a rectangular bag (not shown), as described above, it is possible to easily open the bag without causing wrinkles or scratches by arranging a specific corner of the bag on the extension of the support shaft 23. At this time, if the edge of the bag is inclined, it is preferable to incline the gripping claws 26 so that they are parallel to the inclination of the edge. This allows the gripping claws 26 to apply a uniform force to the edge of the bag when they rotate, making it difficult for scratches to be caused. [Explanation of symbols]

[0025] 10 … Packaging machine 13 … Rotating table 14 … Contact part 141… Middle section 142… Lower section 20 ... Grip unit 21 ... Swivel mechanism 23 … Support shaft 24 … Rotating rod 25a,25b … Arm part 250…Connecting member 25b… Long hole 26 … Gripping claw 30 … Supply unit 40 … Opening unit 50 … Insertion unit 60 ... Sealing unit 70 … Discharge unit

Claims

[Claim 1] The bag-opening device includes a gripping unit that grips a predetermined bag, and an opening unit that opens the bag gripped by the gripping unit, the gripping unit has a pair of gripping claws that grip the edge of the bag, and a rotating mechanism that reciprocally moves the gripping claws in directions approaching and separating from each other, The gripping claws pivot about a predetermined corner of the bag, the rotating mechanism has a support shaft extending in a direction perpendicular to the bag and a rotating rod rotating about the support shaft, The gripping jaws are each supported by a rotating rod of a rotating mechanism, The support shafts each have an arm portion fixed thereto, the arm portion extending toward the other support shaft, a connecting member is provided at the tip of one arm portion, and an oblong hole is formed in the other arm portion extending in its longitudinal direction, A connecting member is inserted into the long hole so as to be movable and rotatable, The gripping unit is installed on a base and is installed at predetermined angles on an intermittently rotatable rotary table, The base is provided with a supply unit that supplies bags to the gripping unit, an opening unit that opens the bag supplied by the supply unit, an input unit that inputs a desired workpiece into the bag opened by the opening unit, and a sealing unit that seals the opening of the bag into which the workpiece has been input, the supply unit, the opening unit, and the input unit are disposed on a moving path of the gripping unit caused by rotation of the rotary table; The base is provided with an abutment portion that is constantly in abutment with the connecting member, The contact portion has a middle portion and a lower portion configured lower than the middle portion, A packaging machine characterized in that the middle portion is provided at a position where it abuts against the connecting member, and the lower portion is provided at a position where it abuts against the connecting member of a gripping unit that faces an opening unit and an insertion unit.

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