Packaging bag jet printing device

Abstract

The invention provides a packaging bag jet printing device, and belongs to the technical field of packaging bag jet printing, and the packaging bag jet printing device comprises a bag taking mechanism which comprises a bag storage frame, the bottom edge of the bag storage frame is provided with a limiting plate, and a suction cup is arranged between a base and the bag storage frame; the mounting plates are arranged on the base below the bag storage frame, and a jet printing machine is erected between the two mounting plates; the transfer frame is movably erected between the two mounting plates, and clamping units are arranged on the two sides of the transfer frame; the jacking mechanism comprises a jacking rod, and the jacking rod is movably arranged in the length direction of the bag storage frame; and the transmission mechanism is arranged between the mounting plate and the transfer frame, and is used for enabling the transfer frame to rotate to be parallel to the bottom surface of the bag storage frame and to be positioned above the sucking disc when the ejector rod is far away from the jet printing machine by a preset length, and to rotate to form a preset angle with the base and to be positioned between the front end of the jet printing machine and the ejector rod when the ejector rod is close to the jet printing machine by a preset distance. The jet printing device can effectively avoid the problem of jet printing failure caused by shaking of the packaging bag and wrinkles on the packaging bag during jet printing.

Description

Technical Field

[0001] The present application belongs to the technical field of packaging bag printing, and in particular, relates to a packaging bag printing device. Background Art

[0002] Before filling, the packaging bags used for packaging liquids or sauces need to be printed with relevant production information to facilitate product traceability. This process usually uses a printing device, but the general printing device lacks effective fixation of the packaging bags. During printing, the packaging bags may shake, resulting in printing failure. In addition, when some wrinkles appear on some packaging bags, the general printing device cannot effectively ensure that the printing surface on the packaging bags remains flat, which leads to printing failure and is not conducive to improving the yield rate of the printing process. Summary of the invention

[0003] In order to solve the above-mentioned deficiencies of the prior art, the present application provides a packaging bag printing device, which can effectively avoid the problem of printing failure caused by shaking of the packaging bag and wrinkles on the packaging bag during printing.

[0004] In order to achieve the above object, the present invention adopts the following technologies: A packaging bag printing device, comprising: The bag taking mechanism comprises a bag storage frame which is provided with through-connections at both ends of the top and bottom surfaces and is erected above the base along the height direction of the base, the size of the bag storage frame is adapted to the size of the packaging bag, a limiting plate for carrying the packaging bag is provided at the bottom edge of the bag storage frame, and a suction cup which is movable and arranged along the height direction of the base is provided between the base and the bag storage frame, and is used to pass through the bottom of the bag storage frame and adsorb the packaging bag carried on the limiting plate; The mounting plates are arranged in pairs and vertically on the base below the bag storage frame. The two mounting plates are respectively and parallelly located on both sides of the bag storage frame. A jet printer is arranged between the front ends of the two mounting plates. The transfer frame is movably mounted between the two mounting plates, the long side of the transfer frame is always parallel to the side of the bag storage frame, the wide side of the transfer frame is always perpendicular to the side of the bag storage frame, the middle of the transfer frame is used to pass the suction cup, and the two sides are used to carry the packaging bag. The two sides of the transfer frame are provided with clamping units for clamping the two side ends of the packaging bag; The tightening mechanism includes a push rod disposed between the two mounting plates and arranged toward the width direction of the bag storage frame, the push rod being movable along the length direction of the bag storage frame and used for supporting the packaging bag clamped on the transfer frame; The transmission mechanism is arranged between the mounting plate and the transfer frame and connected to the transfer frame. The transmission mechanism is used to rotate the transfer frame to be parallel to the bottom surface of the bag storage frame and be located above the suction cup when the push rod is away from the inkjet printer to a predetermined length, and to rotate the transfer frame to form a predetermined angle with the base and be located between the front end of the inkjet printer and the push rod when the push rod is close to a predetermined distance from the inkjet printer.

[0005] Furthermore, the transmission mechanism includes a mounting shaft vertically passed through the two mounting plates and located on one side of the inkjet printer, and a Z-shaped plate arranged parallel to the mounting plate. The mounting shaft is arranged to rotate around its own axis. An arc groove is opened on the mounting plate, and the arc groove is located above one side of the mounting shaft. The center of the arc line of the arc groove contour is located below the other side of the mounting shaft. A connecting rod is vertically arranged on the mounting shaft. The horizontal portion and the vertical portion of the Z-shaped plate are vertically arranged. The vertical portion at one end of the Z-shaped plate is vertically connected to the bottom surface of the rear end of the transfer frame. The vertical portion at the other end of the Z-shaped plate is provided with a matching rod arranged parallel to the mounting shaft. The matching rod is matched in the arc groove. The arc length of the arc groove is adapted to the rotation stroke of the transfer frame. The vertical portion at the other end of the Z-shaped plate is also hinged to one end of the connecting rod, and its hinge axis is arranged parallel to the mounting shaft and located between the matching rod and the horizontal portion of the Z-shaped plate.

[0006] Furthermore, the tightening mechanism includes a first linear mechanism mounted on the base, a movable end of which faces the length direction of the bag storage frame and is connected to a first horizontal plate, and the ejector rod is mounted on the first horizontal plate.

[0007] Furthermore, gears are coaxially connected at both ends of the mounting shaft, a second horizontal plate parallel to one side of the first horizontal plate is passed through the movable end of the first linear mechanism, a spring connected between the first horizontal plate and the second horizontal plate is provided on the movable end of the first linear mechanism, and racks are provided at both ends of the second horizontal plate that are arranged perpendicular to the mounting shaft and meshing with the gears.

[0008] Furthermore, arc grooves are respectively opened on the inner sides of the two mounting plates, and there are two pairs of connecting rods and Z-shaped plates. The vertical parts at one end of the two Z-shaped plates are respectively vertically connected to the two sides of the bottom surface of the rear end of the transfer frame, and the vertical parts at the other ends of the two Z-shaped plates are provided with matching rods and respectively matched in the corresponding arc grooves. The vertical parts at the other ends of the two Z-shaped plates are respectively hinged to one end of the corresponding connecting rod.

[0009] Furthermore, the clamping unit includes motors arranged on both sides of the end of the transfer frame, whose movable ends face the long side direction of the transfer frame and are coaxially connected to a rotating shaft, and two pairs of pressure plates are provided on the rotating shaft, and the distance between the two pressure plates is adapted to the length of the packaging bag.

[0010] Furthermore, the bag taking mechanism also includes a second linear mechanism arranged on the base and located below the bag storage frame, a movable end of which faces the height direction of the base and is connected to the mounting frame, and a suction cup is arranged on the top of the mounting frame.

[0011] The beneficial effects of the present invention are: 1. Through the fixing effect of the clamping unit and the supporting effect of the ejector rod, the problem of printing failure caused by shaking of the packaging bag and wrinkles on the packaging bag during printing can be effectively avoided, thereby improving the printing quality of the printing device. At the same time, under the action of the transmission mechanism, the movement of the ejector rod can be converted into the rotation of the transfer frame, thereby effectively improving the automation degree and printing efficiency of the printing device; 2. Through the cooperation between the matching rod and the arc groove, the slope change of the vertical line between the vertical part at the other end of the Z-shaped plate and the hinge axis of one end of the connecting rod and the axis of the matching rod can be converted into the rotation of the transfer frame during the rotation of the connecting rod, so that the transfer frame can be quickly and accurately rotated in a limited space to be parallel to the bottom surface of the bag storage frame and located above the suction cup, or rotated to form a predetermined angle with the base and located between the front end of the printer and the top rod, which not only improves the transfer efficiency of the transfer frame, but also optimizes the structure of the transmission mechanism and saves installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the main structure of the device of the embodiment of the present application.

[0013] Figure 2 It is a schematic diagram of the structure of the bag storage frame according to an embodiment of the present application.

[0014] Figure 3 It is a schematic diagram of the structure of the transfer frame of the embodiment of the present application.

[0015] Figure 4 It is a structural schematic diagram of the tightening mechanism of the embodiment of the present application.

[0016] Figure 5 yes Figure 4 A magnified view of the part in the figure.

[0017] Figure 6 It is a side view of the device of the embodiment of the present application.

[0018] Figure 7 This is a state diagram of the device of the embodiment of the present application when taking a bag.

[0019] Figure 8 yes Figure 7 A magnified view of the part B in the figure.

[0020] Fig. 9 This is a state diagram of the device of the embodiment of the present application during printing.

[0021] Fig.10 yes Fig. 9 A magnified view of the section C in the middle.

[0022] Figure markings: 1-bag taking mechanism, 11-bag storage frame, 12-limiting plate, 13-suction cup, 14-second straight line mechanism, 15-mounting frame, 16-trachea, 2-base, 3-mounting plate, 4-jet printer, 5-transfer frame, 51-clamping unit, 52-motor, 53-rotating shaft, 54-pressing plate, 55-matching groove, 56-mounting groove, 6-tightening mechanism, 61-thrust rod, 62-first straight line mechanism, 63-first horizontal plate, 64-second horizontal plate, 65-spring, 7-transmission mechanism, 71-mounting shaft, 72-arc groove, 73-connecting rod, 74-Z-shaped plate, 75-matching rod, 76-gear, 77-rack, 78-rack rack. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1 The present application embodiment provides a packaging bag printing device, such as Figure 1 to Figure 6 As shown, it includes: a bag taking mechanism 1, a mounting plate 3, a transfer frame 5, a tightening mechanism 6, a transmission mechanism 7, etc.

[0025] The bag taking mechanism 1 includes a bag storage frame 11 with two ends through-set and erected above the base 2 along the height direction of the base 2, the length and width of the internal space of the material storage frame 11 are equal to the length and width of the packaging bag, and is used to stack multiple packaging bags, and the bottom edge of the bag storage frame 11 is provided with a limiting plate 12 for carrying the packaging bag, and a suction cup 13 is provided between the base 2 and the bag storage frame 11, which is movable along the height direction of the base 2, and is used to pass through the bottom of the bag storage frame 11 and adsorb the packaging bag; the number of mounting plates 3 is a pair and is vertically arranged on the base 2 below the bag storage frame 11, and the two mounting plates 3 are respectively parallel to the two sides of the bag storage frame 11, and a printer 4 is erected between the front ends of the two mounting plates 3; the transfer frame 5 is movably arranged between the two mounting plates 3, the long side of the transfer frame 5 is always parallel to the side of the bag storage frame 11, and the wide side of the transfer frame 5 is always perpendicular to the side of the bag storage frame 11. When the transfer frame 5 is parallel to the bottom surface of the bag storage frame 11 and is located above the suction cup 13, the part thereof can be sucked The disk 13 passes through the base 2 in the height direction, and the distance between the two inner sides of the transfer frame 5 is less than the width of the packaging bag. Clamping units 51 are provided on both sides of the transfer frame 5 for clamping the two end portions of the packaging bag; the tightening mechanism 6 includes a push rod 61 arranged between the two mounting plates 3 and arranged in the width direction of the bag storage frame 11, and the push rod 61 is arranged to move along the length direction of the bag storage frame 11 to support the packaging bag clamped on the transfer frame 5; the transmission mechanism 7 is arranged between the mounting plate 3 and the transfer frame 5, and is used to make the transfer frame 5 rotate to be parallel to the bottom surface of the bag storage frame 11 and be located above the suction cup 13 when the push rod 61 is away from the inkjet printer 4 to a predetermined length, and when the push rod 61 is close to the predetermined distance from the inkjet printer 4, it rotates to form a predetermined angle with the base 2 and is located between the front end of the inkjet printer 4 and the push rod 61, and the range of the predetermined angle is between 80° and 86°, which is used to make the printing surface of the packaging bag clamped on the transfer frame 5 located in front of the nozzle of the inkjet printer 4.

[0026] When applied, such as Figure 2 As shown, the bag storage frame 11 should be filled with packaging bags to be printed. The working principle of the printing device is as follows: Take the bag: Figure 1 to Figure 6As shown, the push rod 61 moves away from the inkjet printer 4 along the length direction of the bag storage frame 11 to a predetermined length. Under the action of the transmission mechanism 7, the transfer frame 5 rotates to be parallel to the bottom surface of the bag storage frame 11 and is located above the suction cup 13. Then the suction cup 13 rises along the height direction of the base 2 and successively passes through the middle of the transfer frame 5 and the bottom of the bag storage frame 11 until the suction cup 13 contacts a packaging bag located at the bottom of the bag storage frame 11. The suction cup 13 sucks it and moves down along the height direction of the base 2, so that the packaging bag is pulled out from the limiting plate 12, and the limiting plate 12 can continue to carry the remaining packaging bags; the suction cup 13 passes through the middle of the transfer frame 5 again. When the two sides of the packaging bag are placed on the two sides of the transfer frame 5, the suction cup 13 releases the suction of the packaging bag. At the same time, the clamping unit 51 clamps the two side ends of the packaging bag to fix the packaging bag on the transfer frame 5. Through the arrangement of the suction cup 13, the bag storage frame 11 and the transfer frame 5, a relatively fast bag-taking method is provided, which is conducive to improving the printing efficiency.

[0027] Transfer: As Figure 4 and Figure 5 As shown, the push rod 61 approaches to a predetermined distance from the inkjet printer 4 along the length direction of the bag storage frame 11. Under the action of the transmission mechanism 7, the transfer frame 5 rotates with the packaging bag to form a predetermined angle with the base 2 and is located between the front end of the inkjet printer 4 and the push rod 61.

[0028] Printing: Figure 1 and Figure 5 As shown, the transfer frame 5 remains fixed, while the push rod 61 continues to approach the printer 4 along the length direction of the bag storage frame 11, until the push rod 61 abuts against the packaging bag clamped on the transfer frame 5, and props up and flattens the packaging bag; the printer 4 prints on the flattened packaging bag. Under the fixing effect of the clamping unit 51 and the supporting effect of the push rod 61, the problem of printing failure caused by the shaking of the packaging bag and the wrinkles on the packaging plate can be effectively avoided, and the printing quality of the printing device is improved; at the same time, under the action of the transmission mechanism 7, the movement of the push rod 61 can be converted into the rotation of the transfer frame 5, which effectively improves the automation degree and printing efficiency of the printing device. After the printing is completed, the clamping unit 51 releases the clamping of the packaging bag, and the packaging bag falls out of the transfer frame 5, and the above operation is repeated to print the next packaging bag.

[0029] Specifically, Figure 3 and Figure 5 As shown, mounting grooves 56 are opened on both sides of the transfer frame 5 along its length direction, and the clamping unit 51 includes motors 52 respectively arranged at one end of the two mounting grooves 56, and the movable ends of the two motors 52 are both facing the long side direction of the transfer frame 5 and are coaxially connected with a rotating shaft 53, and two auxiliary pressure plates 54 are provided on the rotating shaft 53. When the motor 52 drives the rotating shaft 53 to rotate a predetermined angle, the two pressure plates 54 are pressed on both sides of the transfer frame 5, and the distance between the two pressure plates 54 on the rotating shaft 53 is equal to the length of the packaging bag.

[0030] Specifically, Figure 1 and Figure 6 As shown, the bag taking mechanism 1 also includes a second linear mechanism 14 arranged on the base 2 below the bag storage frame 11, a movable end of which faces the height direction of the base 2 and is connected to the mounting frame 15, the suction cup 13 faces the bag storage frame 11 and is arranged on the top of the mounting frame 15, and the bottom of the suction cup 13 is connected to an air pipe 16 with a length adapted to the moving stroke of the suction cup 13, and correspondingly, the other end of the air pipe 16 is connected to the air pump.

[0031] Example 2 As a further implementation of the above embodiment 1, Figure 6~Figure 10 As shown, the transmission mechanism 7 includes a mounting shaft 71 vertically penetrated through the two mounting plates 3 and located on one side of the inkjet printer 4, and an arc groove 72 opened on the mounting plate 3. The mounting shaft 71 is rotatably arranged around its own axis, the arc groove 72 is located above one side of the mounting shaft 71, and the center of the arc of the contour of the arc groove 72 is located below the other side of the mounting shaft 71. A connecting rod 73 is vertically arranged on the mounting shaft 71; the transmission mechanism 7 also includes a Z-shaped plate 74 arranged parallel to the mounting plate 3, the horizontal portion and the vertical portion of the Z-shaped plate 74 are arranged vertically, the vertical portion at one end of the Z-shaped plate 74 is vertically connected to the rear end bottom surface of the transfer frame 5, and the vertical portion at the other end of the Z-shaped plate 74 is provided with a matching rod 75 arranged parallel to the mounting shaft 71, the matching rod 75 is matched in the arc groove 72, the arc length of the arc groove 72 is adapted to the rotation stroke of the transfer frame 5, and the vertical portion at the other end of the Z-shaped plate 74 is also hinged to one end of the connecting rod 73, and its hinge axis is arranged parallel to the mounting shaft 71 and located between the matching rod 75 and the horizontal portion of the Z-shaped plate 74.

[0032] When applied, such as Figure 7~Figure 10 As shown, since one end of the connecting rod 73 is hinged to the other end of the vertical portion of the Z-shaped plate 74, the matching rod 75 of the other end of the vertical portion of the Z-shaped plate 74 is also matched in the arc groove 72, and the hinge axis of the other end of the vertical portion of the Z-shaped plate 74 and one end of the connecting rod 73 is parallel to the installation axis 71 and is located between the matching rod 75 and the horizontal portion of the Z-shaped plate 74. At the same time, since the distance between the hinge point of the other end of the vertical portion of the Z-shaped plate 74 and one end of the connecting rod 73 and the matching rod 75 is always unchanged, the installation axis 71 can rotate around its own axis. In the process of the rotation of the line and driving the connecting rod 73 to rotate, the connecting rod 73 will not only drive the Z-shaped plate 74 to rotate around the installation shaft 71, but also make the matching rod 75 move in the arc groove 72, so that the Z-shaped plate 74 rotates around the hinge axis between the vertical portion at the other end and one end of the connecting rod 73. This is reflected in the transfer frame 5 that when the installation shaft 71 rotates, the transfer frame 5 can also rotate around the hinge axis between the vertical portion at the other end of the Z-shaped plate 74 and one end of the connecting rod 73 while rotating around the axis of the installation shaft 71. Figure 7 and Figure 8 As shown, when the matching rod 75 is located at the bottom end of the arc groove 72, the transfer frame 5 is parallel to the bottom surface of the bag storage frame 11 and is located above the suction cup 13; Fig. 9 and Fig.10 As shown, when the matching rod 75 is located at the top of the arc groove 72, the transfer frame 5 rotates to form a predetermined angle with the base 2 and is located between the front end of the printer 4 and the top rod 61. Through the matching of the matching rod 75 and the arc groove 72, the slope change of the vertical line between the vertical part of the other end of the Z-shaped plate 74 and the hinge axis of one end of the connecting rod 73 and the axis of the matching rod 75 can be converted into the rotation of the transfer frame 5 during the rotation of the connecting rod 73. The advantage of such a setting is that the transfer frame 5 can be quickly and accurately rotated to be parallel to the bottom surface of the bag storage frame 11 and located above the suction cup 13 in a limited space, or rotated to form a predetermined angle with the base 2 and located between the front end of the printer 4 and the top rod 61, which not only improves the transfer efficiency of the transfer frame 5, but also optimizes the structure of the transmission mechanism 7 and saves installation space.

[0033] Specifically, Figure 1 to Figure 6 As shown, the tightening mechanism 6 includes a first linear mechanism 62 mounted on the base 2, with its movable end facing the length direction of the storage bag frame 11 and connected to the first cross plate 63, the push rod 61 is mounted on the first cross plate 63, and the two ends of the mounting shaft 71 are coaxially connected with gears 76. The movable end of the first linear mechanism 62 is penetrated by a second cross plate 64 parallel to one side of the first cross plate 63, and the movable end of the first linear mechanism 62 is provided with a spring 65 connected between the first cross plate 63 and the second cross plate 64. The two ends of the second cross plate 64 are provided with racks 77 perpendicular to the mounting shaft 71 and meshing with the gear 76. Correspondingly, the outer sides of the two mounting plates 3 are provided with rack racks 78 facing the length direction of the storage bag frame 11, and the racks 77 are matched in the corresponding rack racks 78.

[0034] When in use, the first linear mechanism 62 drives the first transverse plate 63 to approach the inkjet printer 4 along the length direction of the bag storage frame 11. Under the action of the spring 65, the second transverse plate 64 moves with the first transverse plate 63. The rack 77 provided on the second transverse plate 64 meshes with the gear 76 to rotate the mounting shaft 71. When the ejector rod 61 approaches to a predetermined distance from the inkjet printer 4, the matching rod 75 moves to the top of the arc groove 72, and the transfer frame 5 rotates to form a predetermined angle with the base 2 and is located between the front end of the inkjet printer 4 and the ejector rod 61. The first linear mechanism 62 continues to drive The first horizontal plate 63 is moved, the spring 65 is stretched and the matching rod 75 is fixed to the top of the arc groove 72. When the push rod 61 supports and flattens the packaging bag, the printer 4 prints the packaging bag; the first linear mechanism 62 drives the first horizontal plate 63 and the second horizontal plate 64 to contract, so that the installation shaft 71 rotates in the opposite direction, and the installation frame 5 gradually rotates to the top of the suction cup 13. When the push rod 61 moves away from the printer 4 to a predetermined distance, the matching rod 75 moves to the bottom of the arc groove 72, and the transfer frame 5 rotates to be parallel to the bottom surface of the bag storage frame 11 and is located above the suction cup 13. Through the arrangement of the first linear mechanism 62, the first horizontal plate 63 and the second horizontal plate 64 and through the cooperation of the gear 76, the rack 77 and the spring 65, the movement of the push rod 61 and the rotation of the transfer frame 5 are realized by a stroke mechanism, which further improves the automation degree of the printing device and improves the printing efficiency.

[0035] Specifically, Figure 6 As shown, the arc grooves 72 are respectively opened on the inner sides of the two mounting plates 3, and the number of connecting rods 73 and Z-shaped plates 74 are both two pairs. The vertical portions at one end of the two Z-shaped plates 74 are respectively vertically connected to the two sides of the bottom surface of the rear end of the transfer frame 5, and the vertical portions at the other ends of the two Z-shaped plates 74 are both provided with matching rods 75 and are respectively matched in the corresponding arc grooves 72, and the vertical portions at the other ends of the two Z-shaped plates 74 are respectively hinged to one end of the corresponding connecting rod 73.

[0036] Specifically, Figure 3 As shown, matching grooves 55 adapted to the push rod 61 are opened along the wide side direction on both sides of the transfer frame 5. The matching grooves 55 are located between the two pressing plates 54. The push rod 61 can be moved into the matching grooves 55 to facilitate flattening of the packaging bag.

[0037] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application.

Claims

1. A packaging bag printing device, characterized in that: include: A bag taking mechanism (1) comprises a bag storage frame (11) with two ends of the top and bottom surfaces being connected and being erected above the base (2) along the height direction of the base (2); the size of the bag storage frame (11) is adapted to the size of the packaging bag; a limiting plate (12) for carrying the packaging bag is provided at the bottom edge of the bag storage frame (11); a suction cup (13) is provided between the base (2) and the bag storage frame (11) and is movably arranged along the height direction of the base (2) and is used to pass through the bottom of the bag storage frame (11) and absorb the packaging bag carried on the limiting plate (12); The mounting plates (3) are arranged in pairs and vertically on the base (2) below the bag storage frame (11); the two mounting plates (3) are respectively and parallelly located on two sides of the bag storage frame (11); and a printing machine (4) is arranged between the front ends of the two mounting plates (3); A transfer frame (5) is movably mounted between the two mounting plates (3), the long side of the transfer frame (5) is always parallel to the side of the bag storage frame (11), the wide side of the transfer frame (5) is always perpendicular to the side of the bag storage frame (11), the middle of the transfer frame (5) is used to pass the suction cup (13), and the two sides thereof are used to carry the packaging bag, and clamping units (51) are provided on both sides of the transfer frame (5) for clamping the two side ends of the packaging bag; A tightening mechanism (6) comprising a push rod (61) disposed between the two mounting plates (3) and arranged in a width direction of the bag storage frame (11), the push rod (61) being arranged to move along the length direction of the bag storage frame (11) and used for supporting the packaging bag clamped on the transfer frame (5); The transmission mechanism (7) is disposed between the mounting plate (3) and the transfer frame (5) and is connected to the transfer frame (5). The transmission mechanism (7) is used to rotate the transfer frame (5) to be parallel to the bottom surface of the bag storage frame (11) and located above the suction cup (13) when the push rod (61) moves away from the inkjet printer (4) to a predetermined distance, and to rotate the transfer frame (5) to form a predetermined angle with the base (2) and be located between the front end of the inkjet printer (4) and the push rod (61) when the push rod (61) moves close to the inkjet printer (4) to a predetermined distance.

2. A packaging bag printing device according to claim 1, characterized in that: The transmission mechanism (7) comprises a mounting shaft (71) vertically penetrating the two mounting plates (3) and located on one side of the inkjet printer (4), and a Z-shaped plate (74) arranged parallel to the mounting plate (3). The mounting shaft (71) is arranged to rotate around its own axis. The mounting plate (3) is provided with an arc groove (72). The arc groove (72) is located above one side of the mounting shaft (71). The center of the arc of the arc groove (72) is located below the other side of the mounting shaft (71). A connecting rod (73) is vertically arranged on the mounting shaft (71). The horizontal portion of the Z-shaped plate (74) is connected to the mounting shaft (71). The vertical portion is vertically arranged, and the vertical portion at one end of the Z-shaped plate (74) is vertically connected to the rear end bottom surface of the transfer frame (5). The vertical portion at the other end of the Z-shaped plate (74) is provided with a matching rod (75) arranged parallel to the installation axis (71), and the matching rod (75) is matched in the arc groove (72). The arc length of the arc groove (72) is adapted to the rotation stroke of the transfer frame (5). The vertical portion at the other end of the Z-shaped plate (74) is also hinged to one end of the connecting rod (73), and its hinge axis is arranged parallel to the installation axis (71) and is located between the matching rod (75) and the horizontal portion of the Z-shaped plate (74).

3. A packaging bag printing device according to claim 2, characterized in that: The tightening mechanism (6) comprises a first linear mechanism (62) mounted on the base (2), a movable end of which faces the length direction of the bag storage frame (11) and is connected to a first transverse plate (63), and a push rod (61) is mounted on the first transverse plate (63).

4. A packaging bag printing device according to claim 3, characterized in that: Gears (76) are coaxially connected to both ends of the mounting shaft (71); a second horizontal plate (64) is passed through the movable end of the first linear mechanism (62) and is located parallel to one side of the first horizontal plate (63); a spring (65) connected between the first horizontal plate (63) and the second horizontal plate (64) is provided on the movable end of the first linear mechanism (62); and racks (77) are provided at both ends of the second horizontal plate (64) and are arranged perpendicular to the mounting shaft (71) and mesh with the gears (76).

5. A packaging bag printing device according to claim 4, characterized in that: The outer sides of the two mounting plates (3) are provided with rack frames (78) facing the length direction of the bag storage frame (11), and the racks (77) are matched in the corresponding rack frames (78).

6. The packaging bag printing device according to claim 2, characterized in that: The arc grooves (72) are respectively formed on the inner sides of the two mounting plates (3). The connecting rods (73) and the Z-shaped plates (74) are each provided with two pairs. The vertical portions at one end of the two Z-shaped plates (74) are respectively vertically connected to the two sides of the bottom surface of the rear end of the transfer frame (5). The vertical portions at the other ends of the two Z-shaped plates (74) are provided with matching rods (75) and are respectively matched in the corresponding arc grooves (72). The vertical portions at the other ends of the two Z-shaped plates (74) are respectively hinged to one end of the corresponding connecting rod (73).

7. The packaging bag printing device according to claim 1, characterized in that: The clamping unit (51) comprises a motor (52) arranged at both sides of the end of the transfer frame (5), wherein the movable end of the motor faces the long side direction of the transfer frame (5) and is coaxially connected to a rotating shaft (53), and two auxiliary pressing plates (54) are arranged on the rotating shaft (53), and the distance between the two pressing plates (54) is adapted to the length of the packaging bag.

8. The packaging bag printing device according to claim 6, characterized in that: Matching grooves (55) adapted to the push rods (61) are provided on both sides of the transfer frame (5) along the width direction, and the matching grooves (55) are located between the two pressing plates (54).

9. The packaging bag printing device according to claim 1, characterized in that: The bag taking mechanism (1) further comprises a second linear mechanism (14) which is arranged on the base (2) and located below the bag storage frame (11), wherein the movable end of the second linear mechanism (14) faces in the height direction of the base (2) and is connected to the mounting frame (15), and the suction cup (13) is arranged on the top of the mounting frame (15).

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