Packaging device with bag squeezing mechanism

Abstract

To provide a packaging device equipped with a bag tying mechanism that overcomes the following problems: conventional bag mouth tying devices consist of mechanisms such as a fluid cylinder with a clamping jaw at its tip, a rotary valve that opens and closes the clamping jaw and a set of clamping arms that tie the bag mouth packed with products supported in a suspended position by the clamping jaw into a narrower shape, which increases the number of parts and makes the structure more complex; and in addition, it is necessary to synchronize the timing of the operation of each of the aforementioned mechanisms, which can easily cause delivery errors when delivering packaged products.SOLUTION: Packaging device 1 equipped with a bag tying mechanism has a set of clamping arms 4 that clamp both sides of a packaging bag P and sequentially convey it to sections of the packaging operation, a clamping arm opening / closing mechanism 2A that moves the tips of the set of clamping arms 4 close to each other in the width direction of the packaging bag P to tie the bag mouth P1 of the packaging bag P and a bag guiding and holding mechanism 2B that guides the packaging bag P so that it does not bend or open during the process of conveying the packaging bag P by the clamp arms 4 and holds the packaging bag when tying the bag mouth P1 of the packaging bag.SELECTED DRAWING: Figure 1

Description

[[Technical Field]]

[0001] The present invention relates to a packaging device provided with a bag neck squeezing mechanism for squeezing the opening of a bag, and more specifically, for example, to a packaging device characterized in that a bag neck squeezing mechanism for squeezing the opening of a packaging bag is provided at one position of a rotary packaging device. [[Background Art]]

[0002] Conventionally, it has been known that a bag neck binding device is arranged outside a packaging device, the bag neck is squeezed by this bag neck binding device, and the bag neck is bound with a fastener such as a clip. For example, Patent Document 1 discloses a rotary-type bag neck binding device. In the rotary-type bag neck binding device of Patent Document 1, a plurality of fluid cylinders project radially from a disc at the upper end of a main shaft, a clamping pawl for clamping is provided at the tip of each fluid cylinder, the disc is stopped under the control of a rotary valve, and at the same time the clamping pawls are closed. While each clamping pawl supports a packaged product in a suspended state and conveys it along a circular orbit, the bag neck of the packaged product is squeezed narrow by a pair of clamp arms and bound by a binding machine. [[Prior Art Literature]] [[Patent Literature]]

[0003] [[Patent Document 1]] JP-A-1-182221 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] However, the above-described conventional bag neck binding device is configured with a fluid cylinder having a clamping pawl at its tip, a rotary valve for opening and closing the clamping pawl, a pair of clamp arms for narrowly squeezing the bag neck of the packaged product supported in a suspended state by the clamping pawl, and the like. Therefore, the number of parts of the bag neck binding device increases, and the structure also becomes complicated. In addition, it is necessary to adjust the operation timing of each of the above mechanisms, and there is also a problem that transfer errors are likely to occur when transferring packaged products.

[0005] The present invention was made to solve the aforementioned problems, and aims to provide a packaging device equipped with a bag-tightening mechanism that has a relatively simple structure, a small number of parts, and is less prone to errors in the delivery of packaged products. [Means for solving the problem]

[0006] The packaging apparatus equipped with the bag squeezing mechanism of the present invention In a packaging device in which multiple clamp arms, each consisting of two arms, are pivotally supported on the periphery of a circular rotor serving as a conveying device, and clamps are attached to the tips of each of the multiple clamp arms to grip both sides of a packaging bag from the front and back, and the packaging bag is suspended by the clamps on both sides and sequentially conveyed through the sections of packaging work around the circular rotor, The packaging device is the The tip of a pair of clamp arms The aforementioned Move so that they are close to each other in the width direction of the packaging bag The aforementioned A clamp arm opening and closing mechanism that tightens a portion of the packaging bag, In the bag-pressing section of the aforementioned packaging work section, a guide plate made of a pair of plate materials is provided, The tip of a pair of clamp arms The aforementioned During the process of moving closer to each other in the width direction of the packaging bags, The aforementioned Instruct the customer to prevent the packaging bag from bending or opening, The aforementioned When squeezing a portion of the packaging bag The aforementioned It is characterized by comprising a bag guide and holding mechanism for holding the packaging bag. [Effects of the Invention]

[0007] According to the present invention, packaging bags can be secured by bringing the tips of a pair of clamp arms that hold the packaging bag close together and squeezing the bag. This results in a simple structure, eliminates the need to change hands to squeeze the bag, and prevents slippage errors that can occur when changing hands on the packaging bag, as is the case with conventional methods. [Brief explanation of the drawing]

[0008] [Figure 1] Partial schematic plan view of a packaging device equipped with the bag squeezing mechanism of the present invention [Figure 2] Partial schematic side view of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 3] Partial schematic front view of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 4] Partial schematic side view of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 5] Plan view of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 6] Diagram illustrating the lifting cam used in the packaging device of the present invention. [Figure 7] Explanatory diagram of the bag guiding and holding mechanism used in the packaging device of the present invention [Figure 8] Plan view and front view of a clamp arm used in the packaging device of the present invention. [Figure 9] Diagram illustrating the usage state of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 10] Diagram illustrating the usage state of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 11] Diagram illustrating the usage state of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 12] Diagram illustrating the usage state of a packaging device equipped with the bag squeezing mechanism of the present invention. [Figure 13] Diagram illustrating the usage state of a packaging device equipped with the bag squeezing mechanism of the present invention. [Modes for carrying out the invention]

[0009] The packaging device equipped with the bag squeezing mechanism of the present invention will be described below with reference to the drawings. In this embodiment, a rotary-type packaging device will be described, but it goes without saying that the present invention is not limited to a rotary-type packaging device, and may also be an elliptical-type packaging device, a linear-type packaging device, etc. In the following, the packaging device 1 equipped with the bag squeezing mechanism may be simply referred to as "packaging device".

[0010] Figure 1 is a schematic plan view of a portion of the packaging apparatus of the present invention, and Figure 2 is a schematic side view of a portion of the packaging apparatus. One section of the packaging apparatus of the present invention (bag squeezing section S5) is provided with a bag squeezing mechanism 2 for squeezing a portion of the packaging bag P (in this embodiment, it is the bag opening P1, but it may also be the bottom of the bag. However, in this embodiment, it will be described using the bag opening P1). The next section S6 after the bag squeezing section S5 is provided with a clamping and transfer mechanism 3 that feeds the bag opening P1 squeezed by the bag squeezing mechanism 2 toward a binding machine (not shown) that binds it with binding devices such as clips (see Figure 13). The binding machine is a well-known device that binds the bag opening using metal or resin clips, tapes, etc.

[0011] In the packaging apparatus of the present invention, a plurality of clamp arms 4 that suspend a packaging bag P by clamping a side portion thereof are pivotally supported. Specifically, in a rotary packaging apparatus, 8 sets of clamp arms 4, with two clamp arms forming one set, are pivotally supported on the peripheral edge of a circular rotor 5 serving as a conveying device, and the structure is configured such that the space between the tips of a set of clamp arms 4 can be opened or closed in a V-shape. A clamp 4A that clamps both side edges of the packaging bag P from the front and rear is attached to the tip of each clamp arm 4. The basic configuration of the packaging apparatus of the present invention is substantially the same as a conventionally known rotary packaging apparatus, and is provided with a driving conveyance motor (not shown). When the rotational driving force of this driving conveyance motor is transmitted to the circular rotor 5, the circular rotor 5 rotates intermittently clockwise (in rotation direction R) or counterclockwise at a pitch of 45°, which corresponds to the circumferential interval between the 8 sets of clamp arms 4, and packaging work is performed in each section. Note that the number of clamp arms 4 of the present invention is not limited to 8 sets.

[0012] The bag squeezing mechanism 2 according to the embodiment of the present invention includes: a clamp arm opening / closing mechanism 2A that closes the space between the tips of the clamp arms 4 so that they approach each other in the width direction of the packaging bag P to squeeze the bag opening P1 of the packaging bag P; and a bag guiding and holding mechanism 2B that restricts the squeezed portion of the bag opening P1 from bending back and forth and prevents the bag opening P1 from expanding. Hereinafter, the clamp arm opening / closing mechanism 2A will be described first.

[0013] In this embodiment, the clamp arm opening / closing mechanism 2A is configured as shown in FIGS. 3 to 6. That is, for each pair of clamp arms 4, the end shaft portion 4c is pivotally supported on the rear surface of the outer peripheral portion of the circular rotor 5. As shown in FIG. 5, a sector tooth portion 4d is provided on the rear lower surface of each pair of clamp arms 4 so as to extend inward of each pair of clamp arms 4. Further, a triangular rotating lever 41e protrudes rearward from one sector gear 41d, and by pushing and pulling this rotating lever 41e, each pair of clamp arms 4 is configured to rotate around the end shaft portion 4c. That is, the end shaft portion 4c of the clamp arm 4 is connected to the sector tooth portion 4d, one sector gear 41d meshes with the other sector gear 42d, rotation of one sector gear 41d drives the other sector gear 42d to rotate, and accordingly, each pair of clamp arms 4 synchronously approach and separate from each other, so that the distal ends open and close. A tension spring 4f is stretched between the clamp arms 4, and biases the clamp arms 4 in the closing direction.

[0014] As shown in FIG. 6, the rear end portion of the rotating lever 41e is connected to one end portion of a substantially L-shaped crank 6b via a connecting link 6a. The crank 6b is rotatably pivotally supported via a pivot shaft 6d attached to a mounting portion 6c extending downward from the circular rotor 5. Further, an abutment roller 6e is rotatably attached to the other end portion of the crank 6b, and the abutment roller 6e rolls clockwise on an elevating cam 6 which is arc-shaped in a plan view (with its center coaxial with the circular rotor 5) and has an inclined portion formed at one end thereof. The elevating cam 6 is attached to an elevating table 6g that is lifted and lowered by an elevating cylinder 6f. As shown in FIG. 4, the elevating cylinder 6f is placed on a support plate 6j supported via a support post 6i on a movable plate 6h that is supported to be reciprocally movable in the circumferential direction below the circular rotor 5. The distal ends of the clamp arms 4 are configured to open and close in conjunction with the circumferential movement and vertical movement of the elevating cam 6. However, the opening / closing mechanism for opening and closing each pair of clamp arms 4 may employ a configuration other than that described above. In FIG. 3, the connecting link 6a, rotating lever 41e, clamp arms 4 and the like are omitted to facilitate understanding of the movement of the crank 6b of the clamp arm opening / closing mechanism 2A.

[0015] As shown in Figures 3 and 5, a driven cam 6K is positioned adjacent to the lifting cam 6. The lifting cam 6 moves up and down to open and close the gap between the tips of the clamp arm 4, but the driven cam 6K does not move up or down. After the lifting cam 6 is lowered by the lifting cylinder 6f, the contact roller 6e moves horizontally onto it. At this time, the clamp arm 4 moves from the bag-pressing section S5 to the binding machine transfer section S6 with its tips closed. The driven cam 6K also moves back and forth in the circumferential direction, in sync with the circumferential reciprocating movement of the lifting cam 6.

[0016] As shown in Figures 2, 5, and 8, the tip of the clamp arm 4 is equipped with a fixed clamp 4a and a movable clamp 4b that constitute the clamp 4A. The fixed clamp 4a is located on the rear side of the tip of the clamp arm 4. The movable clamp 4b is rotatably supported at the tip of the clamp arm 4 via a support pin 4g. The middle portion of the movable clamp 4b is connected to the retractable rod 4i via a drive pin 4h. That is, the retractable rod 4i (see Figure 2) is housed inside the clamp arm 4, and the tip of this retractable rod 4i and the movable clamp 4b are connected by the drive pin 4h. The retractable rod 4i is pulled towards the base of the clamp arm 4 by a tension spring (not shown) also provided inside the clamp arm 4. A roller 4j that protrudes downward from the clamp arm 4 and can move back and forth is attached to this retractable rod 4i. As the roller 4j is pressed forward, the retractable rod 4i also moves forward (in the protruding direction), which causes the movable clamp 4b to open in the binding machine transfer section S6 following the bag-pressing section S5, as shown in Figure 1. When the roller 4j is not subjected to external force, such as in the bag-pressing section S5, the movable clamp 4b is kept closed by the biasing force of the internal tension spring. As shown in Figure 8, an elastic body 4k is attached to the inside of the clamp 4A, allowing the packaging bag P to be held securely.

[0017] As shown in Figure 8, the clamp 4A is fitted with front restricting claws 7A and rear restricting claws 7B that restrict the opening P1 of the packaging bag P from spreading forward and backward when the tip of the clamp arm 4 is closed to constrict the opening P1 of the packaging bag P (including when the constricting operation is completed) and when the packaging bag P is transported to the next step (binding machine transfer section S6). Specifically, as shown in Figure 8(C), the fixed clamp 4a is fitted with a V-shaped rear restricting claw 7B that extends backward and restricts the opening P1 of the packaging bag P from spreading backward when the tip of the clamp arm 4 is closed to constrict the packaging bag P. As shown in Figure 8(D), the rear restricting claws 7B are fitted at the same height. The upper right front restricting claw 71A of the front restricting claws 7A is fitted at the same height as the right rear restricting claw 7B. In this way, by positioning the right rear restricting claw 7B and the upper right front restricting claw 71A at the same height, and positioning the fixed-side gripping claw 3b of the gripping and transfer mechanism 3 (described later) so that it is on the side of these restricting claws 7B and 71A, when the movable-side gripping claw 3a moves towards the fixed-side gripping claw 3b and grips the bag opening P1, the bag opening P1 is also supported by the restricting claws 7B and 71A at the same height, thus preventing the gripping operation from failing.

[0018] Furthermore, the movable clamp 4b is fitted with a V-shaped front restricting claw 7A that extends forward and restricts the opening P1 of the packaging bag P from spreading forward when the tips of a pair of clamp arms 4 are closed to constrict the bag. As shown in Figure 8(D), the front restricting claws 7A are positioned at different heights vertically, and their tips are attached with a small gap between them. With this configuration of the front restricting claws 7A, the constricted portion of the packaging bag P is restricted from spreading forward, and as will be described later, in the next binding machine transfer section S6, after the constricted bag opening is gripped by the movable and fixed gripping claws 3a and 3b of the gripping transfer mechanism (see Figures 8(D) and 13), when the movable clamp 4b is opened, the packaging bag P is released, and the tips of the V-shaped left and right front restricting claws 7A also open, allowing the packaging bag P gripped by the gripping claws 3a and 3b to pass between the left and right front restricting claws 7A and be transferred forward towards the binding machine (not shown) without any problems.

[0019] Next, the bag guide and holding mechanism 2B will be described. The bag guide and holding mechanism 2B guides the opening P1 of the packaging bag P so that it does not bend when the packaging bag P held by the clamp 4A is transported to the bag squeezing section S5, prevents the opening P1 from dropping when the opening is squeezed, and restricts the opening P1 from spreading forward and backward. As shown in Figure 7, the bag guide and holding mechanism 2B includes a guide plate 8A that guides the opening P1 of the packaging bag P so as to clamp it from the front and back, an air chuck section 8B that opens and closes the guide plate 8A, a lifting cylinder 8C that raises and lowers the air chuck section 8B, and a support column 8D that suspends and fixes the lifting cylinder 8C.

[0020] As shown in Figure 7(B), the guide plate 8A consists of a pair of rectangular plates, and the guide plate 8A can be opened and closed back and forth by the air chuck portion 8B. The guide plate 8A has a width approximately the same as the packaging bag P (bag opening P1), and is formed with both ends open outwards as shown in the plan view in Figure 7(B), but it may also be a non-opening shape. The guide plate 8A is attached to the finger portion 8b of the air chuck portion 8B via a mounting bracket 8E, and the guide plate 8A opens and closes back and forth as the finger portion 8b is opened and closed.

[0021] As shown in Figure 2, the mounting bracket 8E uses a hook-shaped fitting, and its upper end is attached to the outside of the finger portion 8b with a screw. As shown in Figure 7(B), the lower end of the mounting bracket 8E is attached to the center, inside of the plate material of the guide plate 8A with a screw. By attaching the lower end of the mounting bracket 8E to the inside in this way, when the guide plate 8A is closed, the lower end of the mounting bracket 8E comes into contact with the plate material, leaving a small gap between them. When the guide plate 8A is closed with the air chuck portion 8B, the upper center of the packaging bag P (bag opening P1) is clamped by the lower end of the mounting bracket 8E, allowing the bag opening P1 to be squeezed, while restricting the packaging bag P from spreading forward and backward, and firmly holding the center of the packaging bag P to prevent it from falling. In this example, the lower end of the mounting bracket 8E holds the center of the packaging bag P, but the means of holding it is not limited to the mounting bracket 8E; a protrusion may be provided in the center and on the inside of the guide plate 8A.

[0022] Next, the operation of the packaging device will be explained. As shown in Figures 9 and 10, when the circular rotor 5 rotates and the packaging bag P is transported to the bag squeezing section S5, the lifting cam 6 is pushed upward by the lifting cylinder 6f, as shown in Figure 6. As a result, the crank 6b rotates counterclockwise around the pivot shaft 6d, and a pair of clamp arms 4 open in a V-shape via the connecting link 6a, the rotating lever 41e, and the fan-shaped teeth 4d, as shown by the solid line in Figure 5. With the pair of clamp arms 4 open in a V-shape, both the left and right ends of the packaging bag P are clamped by the clamps 4A, and the packaging bag P is suspended while being pulled to the left and right. In addition, before the packaging bag P is transported to the bag squeezing section S5, the guide plate 8A is retracted to a position approximately the same as the upper end of the bag opening P1 of the packaging bag P, and is open to the front and back, so as not to interfere with the guide plate 8A when the packaging bag P is transported. When a packaging bag P is transported to the bag squeezing section S5, the guide plate 8A descends and guides the bag opening P1 so that it does not open. As shown in Figure 10, when the packaging bag P intermittently stops in the bag squeezing section S5, the finger portion 8b of the air chuck portion 8B closes, and the guide plate 8A also closes. However, the packaging bag P is left with a small gap in the front and back except for the lower end of the mounting bracket 8E of the guide plate 8A (hereinafter referred to as the locking portion 8e). As a result, the upper central part of the bag opening P1 is locked by the locking portion 8e, but the movement of the parts other than the upper central part is not restricted. As a result, the parts of the bag opening P1 other than the central part are gathered and squeezed towards the center, allowing the bag opening P1 of the packaging bag P to be squeezed into a nice shape.

[0023] Subsequently, when the lifting cylinder 8C lowers the lifting cam 6, the crank 6b rotates clockwise, and via the connecting link 6a, the rotating lever 41e, and the fan-shaped teeth 4d, the tips of the pair of clamp arms 4 move to the center and close, as shown by the dashed line in Figure 5. Then, as shown in Figure 11, the tips of the clamp arms 4 move to the center while the left and right sides of the bag opening P1 remain clamped by the clamps 4A. As a result, both sides of the bag opening P1 are gathered and squeezed towards the center. In this way, the tips of the clamps 4A that clamp both the left and right ends of the packaging bag P are brought close to each other by the clamp arm opening and closing mechanism 2A, and the packaging bag P can be squeezed well, thus eliminating the need for conventional clamping arms. Moreover, unlike conventional methods, there is no need to switch the grip of the packaging bag P using the clamping arms. Since only one set of clamping arms 4 is moved, the positional adjustment between the clamp and the gripping arms, which was done in the past, becomes unnecessary. Furthermore, the possibility of misgrabbing the packaging bag P when switching grips is eliminated, improving reliability.

[0024] Furthermore, the clamp 4A is equipped with front restricting claws 7A and rear restricting claws 7B that restrict the opening P1 of the constricted packaging bag P from spreading forward and backward, thus ensuring that the constricted state of the bag opening P1 is maintained well. After this, as shown in Figure 11, the guide plate 8A opens and retracts upward, and with the bag opening P1 still clamped and constricted by the clamp 4A, the circular rotor 5 rotates intermittently to transport the packaging bag P to the next binding machine transfer section S6. 9 are guide rails positioned in front of and behind the packaging bag P (only the front guide is shown in Figures 11 and 12), which guide the packaging bag P to prevent it from swinging outward due to centrifugal force as the circular rotor 5 rotates and transports the packaging bag P suspended from the clamp arm 4.

[0025] When the packaging bag P is transported to the strapping machine transfer section S6 and intermittently stops, the process moves to move to the strapping machine located in front of the strapping machine transfer section S6. That is, as shown in Figure 13, when the packaging bag P with its opening P1 constricted intermittently stops at the strapping machine transfer section S6, as shown in Figure 8(D), the movable side of the clamping transfer mechanism 3 opens the clamping claw 3a, and the movable and fixed side clamping claws 3a, 3b move forward to grasp the constricted opening P1. When the movable and fixed side clamping claws 3a, 3b reach the position of the opening P1, the movable side clamping claw 3a closes and the opening P1 is clamped by the movable and fixed side clamping claws 3a, 3b. After the opening P1 is clamped by the clamping claws 3a, 3b, the movable clamp 4b of the clamp 4A is opened and the packaging bag P is released, and the clamping claws 3a, 3b move towards the strapping machine. As described above, when the movable clamp 4b opens and the bag opening P1 is released, the left and right front restricting claws 7A also open, so the constricted bag opening P1 can pass through the left and right front restricting claws 7A and move toward the strapping machine (not shown) without any obstruction. The strapping machine straps the bag opening P1, which has been constricted by the bag constricting mechanism 2, with a strapping device such as a clip. Meanwhile, the circular rotor rotates and the clamp arm 4 that has released the packaging bag P moves to the next section. [Industrial applicability]

[0026] The packaging device of the present invention can be applied to a packaging device that tightens the opening of a packaging bag containing the items to be packaged and fastens it with a fastener such as a clip. [Explanation of Symbols]

[0027] 1. Packaging device equipped with a bag squeezing mechanism 2-bag squeezing mechanism 2A Clamp arm opening and closing mechanism 2B Bag guide and holding mechanism 3 Clamping transfer mechanism 3a Movable gripping claw 3b Fixed clamping claw 4 clamp arms 4A Clamp 4a Fixing clamp 4b Movable clamp 4c End shaft part 4d Sector tooth part 41d One sector gear 41e Rotating lever 42d Other sector gear 4f tension spring 4g support pin 4h drive pin 4i Exit Rod 4J Laura 4k elastic body 5 circular rotors 6. Lifting cam 6a Linking links 6b crank 6c Mounting part 6d pivot axis 6e Contact Roller 6f Lifting Cylinder 6g lifting platform 6h movable plate 6i post 6j support plate 6K Driven Cam 7 Regulating claws 7A Front regulating claw 7B Rear regulating claw 8A Guide Plate 8B Air Chuck Section 8C Lifting Cylinder 8D strut 8E Mounting Bracket 8e Locking part 8b Finger section 9 Guide rails P packaging bag P1 bag opening

Claims

1. A packaging device in which a plurality of clamp arms, each consisting of two arms, are pivotally supported on the periphery of a circular rotor serving as a conveying device, and clamps are attached to the tip of each of the plurality of clamp arms to grip both sides of a packaging bag from the front and back, and the packaging bag is suspended by the clamps on both sides and conveyed sequentially through sections of packaging work around the circular rotor, The packaging apparatus is characterized by comprising: a clamp arm opening and closing mechanism that moves the tips of a pair of clamp arms closer to each other in the width direction of the packaging bag to constrict a portion of the packaging bag; and a bag guiding and holding mechanism provided in the bag constricting section of the packaging work section, which includes a pair of guide plates made of plate material that guide the tips of the pair of clamp arms so as not to bend or open during the process of moving them closer to each other in the width direction of the packaging bag, and holds the packaging bag when constricting a portion of the packaging bag.

2. A packaging device equipped with a bag squeezing mechanism according to Claim 1, wherein a front restricting claw and a rear restricting claw are attached to the clamp, respectively, to restrict the squeezing portion of the packaging bag that is clamped and squeezed by the clamp from spreading forward and backward, and one pair of the rear restricting claws is provided at the same height on the fixed clamp of the clamp, and one pair of the front restricting claws is provided at different heights on the movable clamp of the clamp.

3. The packaging device equipped with the bag squeezing mechanism according to Claim 1, wherein the bag guiding and holding mechanism comprises a guide plate that approaches the packaging bag from the front and rear of the outside of the packaging bag and guides the packaging bag in close proximity; a locking part provided on the inside of the guide plate and partially locking the packaging bag to hold the packaging bag; a zipper part that opens and closes the guide plate back and forth; and a lifting cylinder that moves the zipper part up and down, wherein when the squeezing operation of the packaging bag is performed, the bag is sandwiched by the guide plate with a gap equal to the thickness of the locking part.

4. A packaging device equipped with a bag squeezing mechanism according to Claim 1, characterized in that a binding machine transfer section is provided downstream of the bag squeezing section, a clamping transfer mechanism consisting of a pair of clamping claws is arranged in the binding machine transfer section, and the squeezed portion of the packaging bag after the squeezing operation is completed is clamped by the pair of clamping claws and transferred to the binding machine side by the pair of clamping arms.

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