CN213201763U - Packaging bag front and back surface synchronization system - Google Patents

Abstract

The utility model relates to a packaging bag front and back surface synchronization system, which comprises a frame, a surface changing mechanism, a cutting mechanism and a synchronization mechanism which are arranged on the frame, and a pressing mechanism which is arranged on the frame and is used for pressing two plastic papers; the surface changing mechanism comprises two second inclined rollers which are rotatably supported on the rack, and the two second inclined rollers are vertically and symmetrically arranged relative to a horizontal plane; the cutting mechanism is arranged between the first inclined roller and the second inclined roller and is used for cutting the plastic paper into two parts, one part of the plastic paper bypasses the second inclined roller positioned above, and the other part of the plastic paper bypasses the second inclined roller positioned below. The utility model discloses a carry out the function that overturns to plastic paper to can make two plastic paper set up relatively on a machine.

Description

Packaging bag front and back surface synchronization system

Technical Field

The utility model belongs to the technical field of the technique of wrapping bag production facility and specifically relates to a wrapping bag dead-back synchronizing system is related to.

Background

The plastic packaging bag is made of plastic paper through processes of printing, compounding, hot pressing and the like, the front face and the back face of the common three-edge packaging bag are arranged oppositely, so that one face with patterns can be exposed outside the packaging bag, and meanwhile, the plastic paper on the front face and the plastic paper on the back face need to be mutually synchronous in order to ensure that the patterns on the front face and the back face can be mutually corresponding.

At present, a patent document with an authorization publication number of CN207327712U discloses an automatic plastic packaging bag production device, which mainly adopts the technical scheme that the device comprises an input mechanism, wherein the input mechanism comprises a first frame body and a second frame body which are symmetrically arranged, two fixing devices which are respectively and fixedly arranged on the first frame body and the second frame body, and a telescopic roller which is clamped between the two fixing devices; the input mechanism can be adjusted according to the size of the plastic film, and the adaptability of the input mechanism is improved.

Although the automatic plastic packaging bag production equipment can process films with different width sizes, the films cannot be turned over, so that two films cannot be oppositely arranged on one machine, and one surface of the two films with patterns cannot be exposed to the outside for pressing.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the above-mentioned prior art, the utility model aims at providing a wrapping bag just back synchronizing system, its second oblique roller through setting up two symmetries and setting up the cutting mechanism who cuts off plastic paper between two second oblique rollers has realized carrying out the function that overturns to plastic paper to can make two plastic paper set up relatively on a machine.

The above object of the present invention is achieved by the following technical solutions:

a packaging bag front-back surface synchronization system comprises a rack, a surface changing mechanism, a cutting mechanism, a synchronization mechanism and a pressing mechanism, wherein the surface changing mechanism, the cutting mechanism and the synchronization mechanism are installed on the rack; the surface changing mechanism comprises two second inclined rollers which are rotatably supported on the rack, and the two second inclined rollers are vertically and symmetrically arranged relative to a horizontal plane; the cutting mechanism is arranged between the first inclined roller and the second inclined roller and is used for cutting the plastic paper into two parts, one part of the plastic paper bypasses the second inclined roller positioned above, and the other part of the plastic paper bypasses the second inclined roller positioned below.

By adopting the technical scheme, the plastic paper tray to be used is wound on the feeding roller, and the plastic paper on the feeding roller can be gradually pulled open by applying pulling force to the end part of the plastic paper far away from the feeding roller; the plastic paper can change the direction of conveying through the face changing mechanism, the cutting mechanism can cut the plastic paper into two parts, one part bypasses the second inclined roller positioned above, the other part bypasses the second inclined roller positioned below, therefore, the two parts of the plastic paper can be oppositely arranged after passing through the second inclined roller, the plastic paper is overturned, and therefore the two plastic papers can be oppositely arranged on one machine.

The utility model discloses a further set up to: the cutting mechanism comprises a cutter, the cutting edge of the cutter penetrates through the surface of the plastic paper, and the cutting mechanism further comprises an adjusting device which is arranged on the rack and used for adjusting the position of the cutter.

Through adopting above-mentioned technical scheme, the cutting edge of cutter passes plastic paper, and when plastic paper removed, plastic paper can hit on the cutter voluntarily to make plastic paper divide into two parts, realize carrying out the function of cutting to plastic paper.

The utility model discloses a further set up to: the adjusting device comprises a vertical groove formed in the rack and an adjusting seat in sliding fit in the vertical groove, a first threaded hole is formed in the adjusting seat, and a first locking rod is in threaded fit in the first threaded hole; the adjusting device further comprises a fixed shaft fixed on the adjusting seat, a rotating seat is rotatably connected onto the fixed shaft, the end part of the cutter is hinged onto the rotating seat, a second threaded hole is formed in the rotating seat, and a second locking rod is matched with the second threaded hole in a threaded manner; the adjusting device further comprises a locking plate fixed on the rotating seat, a broach spring is connected between the locking plate and the cutter, a third threaded hole is formed in the locking plate, a third locking rod is matched with the third threaded hole in a threaded mode, and the end portion of the third locking rod corresponds to the cutter back of the cutter.

Through adopting above-mentioned technical scheme, change the position of adjustment seat from top to bottom, it can lock the position of adjustment seat to rotate first check lock lever, it can fix the position of rotating the seat to screw up the second check lock lever after adjusting the position of rotating the seat, and rotate the tip that the third check lock lever can make the third check lock lever and support on the cutter, thereby promote the cutter, change the installation angle of cutter, reverse rotation third check lock lever can make the broach spring pull back the cutter automatically, consequently, can realize the upper and lower position to the cutter through adjusting device, the function that cutting angle adjusted.

The utility model discloses a further set up to: the end parts of the first locking rod and the second locking rod are respectively fixedly provided with a locking handle, the locking handle is of a rod-shaped structure and is perpendicular to the locking rods fixed by the locking handle, and one end part of the locking handle is fixed on the locking rods fixed by the locking handle.

Through adopting above-mentioned technical scheme, when needs are twisted the locking lever and are moved, thereby can make whole hand master on the locking handle, thereby rotate the locking handle and drive the locking lever, convenient and fast more when rotating the locking lever.

The utility model discloses a further set up to: the synchronous mechanism comprises two slide rails vertically fixed on the rack and two slide seats in sliding fit with the two slide rails, and the two slide seats are arranged oppositely up and down; the synchronous mechanism also comprises a paper drawing roller which is rotatably supported on the sliding seat, and the upper part and the lower part of the plastic paper which bypasses the second inclined roller bypass the paper drawing rollers on the upper sliding seat and the lower sliding seat respectively; and the two sliding seats are connected with a driving device capable of driving the two sliding seats to move oppositely or reversely.

Through adopting above-mentioned technical scheme, under drive arrangement's effect, two sliding seats can form the motion that is close to or keeps away from with the rhythm to match with the rhythm of the power of intermittent type nature pulling plastic paper removal, be favorable to making plastic paper be in the state of tightening all the time, guarantee that two parts of plastic paper are in synchronous motion.

The utility model discloses a further set up to: the driving device comprises a motor arranged on the rack and a cam coaxially fixed on an output shaft of the motor, the contour line of the cam is of a symmetrical structure, the rotation center of the cam is positioned between the two sliding seats, and the cam is matched with the two sliding seats simultaneously; the driving device further comprises a reset spring connected between each sliding seat and the rack, the stretching direction of each reset spring is vertical, one end of each reset spring is fixed on each sliding seat, and the other end of each reset spring is fixed on the rack.

By adopting the technical scheme, the reset spring has the tendency of pulling the two sliding seats to be close to each other, and after the motor drives the cam to rotate, the two sliding seats can form rhythmical approaching or separating actions under the pushing action of the cam and the pulling action of the reset spring.

The utility model discloses a further set up to: the rack is also provided with a fine adjustment mechanism, the fine adjustment mechanism comprises two sliding chutes vertically arranged on the rack, and the two sliding chutes are oppositely arranged along the horizontal direction; the fine adjustment mechanism further comprises fine adjustment sliding blocks which are in sliding fit in the sliding grooves, and a fine adjustment roller which is rotatably supported between the two fine adjustment sliding blocks, is arranged by bypassing the fine adjustment roller around the plastic paper on the sliding seat above the fine adjustment mechanism, and is abutted against the plastic paper; the fine adjustment mechanism further comprises a fine adjustment hole formed in the end portion of the sliding groove, a fine adjustment screw rod is matched with the fine adjustment hole in a threaded mode, the fine adjustment screw rod penetrates through the fine adjustment hole, and the end portion of the fine adjustment screw rod is rotatably supported on the fine adjustment sliding block.

Through adopting above-mentioned technical scheme, through rotating the fine setting screw rod, can adjust the upper and lower position of fine setting slider to change the height of fine setting roller, and then change the degree of tightening that is located the plastic paper of top, if the pattern of upper and lower two parts plastic paper takes place the dislocation, can finely tune the position of pattern through the degree of tightening of adjustment top plastic paper, thereby make upper and lower two parts plastic paper pattern correspond again.

The utility model discloses a further set up to: the fine adjustment mechanism further comprises a fine adjustment handle fixed at the end part of the fine adjustment screw rod, the fine adjustment handle is circular, and a plurality of notches are uniformly formed in the edge of the fine adjustment handle along the circumferential direction.

Through adopting above-mentioned technical scheme, fine setting handle and breach make things convenient for the staff to carry out the application of force with the hand when holding fine setting handle and rotate, and then conveniently rotate the fine setting screw rod.

To sum up, the utility model discloses a beneficial technological effect does:

1. the plastic paper can change the conveying direction through the surface changing mechanism, and the cutting mechanism can cut the plastic paper into two parts, one part bypasses the second inclined roller positioned above, and the other part bypasses the second inclined roller positioned below, so that the two parts of the plastic paper can be oppositely arranged after passing through the second inclined roller, and the function of overturning the plastic paper is realized;

2. the adjusting device can realize the function of adjusting the up-down position and the cutting angle of the cutter; the two sliding seats can form rhythmical approaching or departing actions so as to be matched with the rhythm of power for intermittently pulling the plastic paper to move and ensure that the two parts of the plastic paper move synchronously;

3. the upper and lower positions of the fine adjustment sliding block can be adjusted by rotating the fine adjustment screw rod, so that the height of the fine adjustment roller is changed, the tightening degree of the plastic paper above the fine adjustment roller is changed, and if the patterns of the upper and lower plastic paper are staggered, the positions of the patterns can be finely adjusted by adjusting the tightening degree of the plastic paper above the fine adjustment roller.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the overall structure of the present invention;

FIG. 3 is an enlarged partial schematic view of portion A of FIG. 2;

FIG. 4 is a schematic structural view of a synchronizing mechanism;

fig. 5 is a partially enlarged schematic view of a portion B in fig. 1.

In the figure, 01, plastic paper; 1. a frame; 11. a feed roller; 2. a noodle changing mechanism; 21. a first inclined roller; 22. a vertical supporting roller; 23. a second inclined roller; 3. a cutting mechanism; 31. a cutter; 32. an adjustment device; 321. a vertical groove; 322. an adjusting seat; 3221. a first threaded hole; 3222. a first locking lever; 323. a fixed shaft; 324. a rotating seat; 3241. a second threaded hole; 3242. a second locking lever; 325. a locking plate; 3251. a third threaded hole; 3252. a third locking lever; 33. a broach spring; 34. locking the handle; 4. a synchronization mechanism; 41. a slide rail; 42. a sliding seat; 43. drawing a paper roll; 44. a drive device; 441. an electric motor; 442. a cam; 443. a return spring; 5. a fine adjustment mechanism; 51. a chute; 52. finely adjusting the sliding block; 53. a fine adjustment roller; 54. fine tuning the pores; 55. fine adjustment of the screw rod; 56. a fine adjustment handle; 561. and (4) a notch.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the packaging bag front and back synchronizing system disclosed by the present invention comprises a frame 1, a face changing mechanism 2, a cutting mechanism 3, and a synchronizing mechanism 4 mounted on the frame 1, and further comprises a pressing mechanism (not shown in the figure) mounted on the frame 1 for pressing two plastic sheets 01, wherein the pressing mechanism adopting hot pressing or cold pressing is prior art; the frame 1 is provided with a feeding roller 11, the plastic paper 01 to be used is coiled on the feeding roller 11, and the plastic paper 01 on the feeding roller 11 can be gradually pulled open by applying a pulling force on the end part of the plastic paper 01 far away from the feeding roller 11; the plastic paper 01 can change the conveying direction through the surface changing mechanism 2, the cutting mechanism 3 can cut the plastic paper 01 into two parts, and after the two parts of the plastic paper 01 are changed into a state of being oppositely arranged under the action of the surface changing mechanism 2, the two surfaces of the plastic paper 01 are oppositely pressed together through the pressing mechanism for subsequent processing.

Referring to fig. 1 and 2, the plane changing mechanism 2 comprises a first inclined roller 21 rotatably supported on the frame 1, the first inclined roller 21 is arranged at an inclination of forty-five degrees relative to the horizontal plane, and the conveying direction of the plastic paper 01 on the feeding roller 11 is changed to ninety degrees after the end of the plastic paper passes around the first inclined roller 21; the noodle changing mechanism 2 further comprises a plurality of vertical supporting rollers 22 rotatably supported on the rack 1, and further comprises two second inclined rollers 23 rotatably supported on the rack 1, wherein the second inclined rollers 23 are all arranged by forty-five degrees relative to the horizontal plane, and the two second inclined rollers 23 are mutually perpendicular and arranged up and down; the cutting mechanism 3 is installed between the first inclined roller 21 and the second inclined roller 23, and one part of the two parts of the plastic paper 01 cut by the cutting mechanism 3 bypasses the second inclined roller 23 positioned above, and the other part bypasses the second inclined roller 23 positioned below, so that the two parts of the plastic paper 01 can become opposite after passing through the second inclined roller 23, and the function of changing the plane is realized.

Referring to fig. 2 and 3, the cutting mechanism 3 includes a cutter 31, a cutting edge of the cutter 31 penetrates through the surface of the plastic paper 01, and the cutting mechanism 3 further includes an adjusting device 32 mounted on the frame 1 for adjusting the position of the cutter 31; the adjusting device 32 comprises a vertical groove 321 arranged on the frame 1, and further comprises an adjusting seat 322 slidably fitted in the vertical groove 321, a first threaded hole 3221 is formed in the adjusting seat 322, the first threaded hole 3221 is a through hole, a first locking rod 3222 is in threaded fit with the first threaded hole 3221, the position of the adjusting seat 322 is changed up and down, and the position of the adjusting seat 322 can be locked by rotating the first locking rod 3222; the adjusting device 32 further comprises a fixed shaft 323 fixed on the adjusting seat 322, a rotating seat 324 is rotatably connected to the fixed shaft 323, the end of the cutter 31 is hinged to the rotating seat 324, a second threaded hole 3241 is formed in the rotating seat 324, a second locking rod 3242 is matched with the internal thread of the second threaded hole 3241, and the position of the rotating seat 324 can be fixed by screwing the second locking rod 3242 after the position of the rotating seat 324 is adjusted; the adjusting device 32 further comprises a locking plate 325 fixed on the rotating seat 324, a broach spring 33 is connected between the locking plate 325 and the cutter 31, the broach spring 33 has a tendency of pulling the cutter 31 to move towards the locking plate 325, in addition, a third threaded hole 3251 is formed in the locking plate 325, a third locking rod 3252 is matched with the third threaded hole 3251 in an internal thread manner, the end part of the third locking rod 3252 corresponds to the back of the cutter 31, the end part of the third locking rod 3252 can be abutted against the cutter 31 by rotating the third locking rod 3252, so that the cutter 31 is pushed, the installation angle of the cutter 31 is changed, and the broach spring 33 can automatically pull back the cutter 31 by reversely rotating the third locking rod 3252; the adjusting device 32 can adjust the vertical position and the cutting angle of the cutter 31; in addition, the end portions of the first locking rod 3222 and the second locking rod 3242 are respectively and fixedly provided with a locking handle 34, the locking handle 34 is of a rod-shaped structure and perpendicular to the locking rod fixed to the locking rod, one end portion of the locking handle 34 is fixed to the locking rod fixed to the locking handle, when the locking rod needs to be screwed, the whole hand can be held on the locking handle 34, the locking handle 34 is rotated to drive the locking rod, and the locking rod is rotated more conveniently and rapidly.

Referring to fig. 1 and 4, the synchronizing mechanism 4 includes two slide rails 41 vertically fixed on the frame 1, and further includes two slide seats 42 slidably fitted on the two slide rails 41, the two slide seats 42 are disposed opposite to each other up and down, the synchronizing mechanism 4 further includes a paper pulling roller 43 rotatably supported on the slide seats 42, and the paper pulling roller 43 is disposed such that the upper and lower portions of the plastic paper 01 passing around the second inclined roller 23 pass around the upper and lower slide seats 42, respectively; the two sliding seats 42 are connected with a driving device 44 capable of driving the two sliding seats 42 to move towards or away from each other, the driving device 44 comprises a motor 441 mounted on the frame 1, and further comprises a cam 442 coaxially fixed on an output shaft of the motor 441, the contour line of the cam 442 is a symmetrical structure, the rotation center of the cam 442 is located between the two sliding seats 42, and the cam 442 is simultaneously matched with the two sliding seats 42; the driving device 44 further includes a return spring 443 connected between each sliding seat 42 and the rack 1, the extension direction of the return spring 443 is vertical, one end of the return spring 443 is fixed on the sliding seat 42, the other end of the return spring 443 is fixed on the rack 1, the return spring 443 has a tendency of pulling the two sliding seats 42 to approach each other, after the motor 441 drives the cam 442 to rotate, under the pushing action of the cam 442 and the pulling action of the return spring 443, the two sliding seats 42 can form a rhythmic approaching or separating action, so that the rhythmic motion is matched with the rhythm of the power for intermittently pulling the plastic paper 01 to move, the plastic paper 01 is always in a tense state, and the two parts of the plastic paper 01 are ensured to be in synchronous motion.

Referring to fig. 1 and 5, a fine adjustment mechanism 5 is further disposed on the rack 1, the fine adjustment mechanism 5 includes two sliding chutes 51 vertically disposed on the rack 1, and the two sliding chutes 51 are disposed oppositely along a horizontal direction; the fine adjustment mechanism 5 further comprises fine adjustment sliding blocks 52 which are in sliding fit in the sliding grooves 51, and further comprises fine adjustment rollers 53 which are rotatably supported between the two fine adjustment sliding blocks 52, the plastic paper 01 conveyed from the sliding seat 42 positioned above bypasses the fine adjustment rollers 53, and the fine adjustment rollers 53 are abutted against the plastic paper 01; the fine adjustment mechanism 5 further comprises a fine adjustment hole 54 formed in the end portion of the sliding groove 51, the fine adjustment hole 54 is a threaded hole and is arranged in the vertical direction, a fine adjustment screw 55 is matched with the inner thread of the fine adjustment hole 54, the fine adjustment screw 55 penetrates through the fine adjustment hole 54, and the end portion of the fine adjustment screw is rotatably supported on the fine adjustment sliding block 52; the upper and lower positions of the fine adjustment slide block 52 can be adjusted by rotating the fine adjustment screw 55, so that the height of the fine adjustment roller 53 is changed, the tightening degree of the plastic paper 01 positioned above is further changed, and if the patterns of the upper and lower plastic paper 01 are staggered, the positions of the patterns can be finely adjusted by adjusting the tightening degree of the upper plastic paper 01, so that the patterns of the upper and lower plastic paper 01 correspond again; in addition, fine setting mechanism 5 is still including fixing the fine setting handle 56 at fine setting screw 55 tip, and fine setting handle 56 is circular, and a plurality of breachs 561 have evenly been seted up along the circumferencial direction in the edge of fine setting handle 56, and breach 561 makes things convenient for the staff to hold fine setting handle 56 and rotate the time, and the hand is used for the application of force, and then conveniently rotates fine setting screw 55.

The working principle of the utility model is that the plastic paper 01 to be used is coiled on the feeding roller 11, and the plastic paper 01 on the feeding roller 11 can be gradually pulled open by applying a pulling force on the end part of the plastic paper 01 far away from the feeding roller 11; the plastic paper 01 can change the conveying direction through the surface changing mechanism 2, the cutting mechanism 3 can cut the plastic paper 01 into two parts, one part bypasses the second inclined roller 23 positioned above, and the other part bypasses the second inclined roller 23 positioned below, so that the two parts of the plastic paper 01 can be oppositely arranged after passing through the second inclined roller 23, the plastic paper 01 can be overturned, and the two plastic papers 01 can be oppositely arranged on one machine.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a wrapping bag positive back synchronizing system, includes frame (1), its characterized in that: the machine also comprises a face changing mechanism (2), a cutting mechanism (3) and a synchronizing mechanism (4) which are arranged on the rack (1), and a pressing mechanism which is arranged on the rack (1) and is used for pressing the two plastic papers (01); the feeding roller (11) used for coiling the plastic paper (01) is installed on the rack (1), the surface changing mechanism (2) comprises two second inclined rollers (23) rotatably supported on the rack (1), and the two second inclined rollers (23) are vertically and symmetrically arranged relative to a horizontal plane; the noodle changing mechanism (2) further comprises a first inclined roller (21) rotatably supported on the rack (1), the cutting mechanism (3) is installed between the first inclined roller (21) and the second inclined roller (23) and used for cutting the plastic paper (01) into two parts, one part of the plastic paper (01) bypasses the second inclined roller (23) positioned above, and the other part bypasses the second inclined roller (23) positioned below.

2. The front and back synchronizing system for packing bags according to claim 1, wherein: the cutting mechanism (3) comprises a cutter (31), the cutting edge of the cutter (31) penetrates through the surface of the plastic paper (01), and the cutting mechanism (3) further comprises an adjusting device (32) which is arranged on the rack (1) and used for adjusting the position of the cutter (31).

3. The front and back synchronizing system for packing bags according to claim 2, wherein: the adjusting device (32) comprises a vertical groove (321) formed in the rack (1) and an adjusting seat (322) in sliding fit with the vertical groove (321), a first threaded hole (3221) is formed in the adjusting seat (322), and a first locking rod (3222) is matched with an internal thread of the first threaded hole (3221); the adjusting device (32) further comprises a fixed shaft (323) fixed on the adjusting seat (322), a rotating seat (324) is rotatably connected to the fixed shaft (323), the end part of the cutter (31) is hinged to the rotating seat (324), a second threaded hole (3241) is formed in the rotating seat (324), and a second locking rod (3242) is matched with the second threaded hole (3241) in a threaded manner; the adjusting device (32) further comprises a locking plate (325) fixed on the rotating seat (324), a broach spring (33) is connected between the locking plate (325) and the cutter (31), a third threaded hole (3251) is formed in the locking plate (325), a third locking rod (3252) is matched with the inner thread of the third threaded hole (3251), and the end part of the third locking rod (3252) corresponds to the back of the cutter (31).

4. The front and back synchronizing system for packing bags according to claim 3, wherein: the end parts of the first locking rod (3222) and the second locking rod (3242) are respectively and fixedly provided with a locking handle (34), the locking handle (34) is of a rod-shaped structure and is perpendicular to the locking rods fixed by the locking handle, and one end part of the locking handle (34) is fixed on the locking rods fixed by the locking handle.

5. The front and back synchronizing system for packing bags according to any one of claims 1 to 4, wherein: the synchronizing mechanism (4) comprises two sliding rails (41) vertically fixed on the rack (1) and two sliding seats (42) in sliding fit with the two sliding rails (41), the two sliding seats (42) are arranged, and the two sliding seats (42) are arranged oppositely up and down; the synchronous mechanism (4) also comprises a paper drawing roller (43) rotatably supported on the sliding seat (42), and the upper part and the lower part of the plastic paper (01) bypassing the second inclined roller (23) respectively bypass the paper drawing rollers (43) on the upper sliding seat and the lower sliding seat (42); the two sliding seats (42) are connected with a driving device (44) capable of driving the two sliding seats (42) to move towards or away from each other.

6. The front and back synchronizing system for packing bags according to claim 5, wherein: the driving device (44) comprises a motor (441) arranged on the frame (1) and a cam (442) coaxially fixed on an output shaft of the motor (441), the contour line of the cam (442) is a symmetrical structure, the rotation center of the cam (442) is positioned between the two sliding seats (42), and the cam (442) is simultaneously matched with the two sliding seats (42); the driving device (44) further comprises a return spring (443) connected between each sliding seat (42) and the rack (1), the extension direction of the return spring (443) is vertical, one end of the return spring (443) is fixed on the sliding seat (42), and the other end of the return spring is fixed on the rack (1).

7. The front and back synchronizing system for packing bags according to claim 5, wherein: the rack (1) is also provided with a fine adjustment mechanism (5), the fine adjustment mechanism (5) comprises two sliding chutes (51) which are vertically arranged on the rack (1), and the two sliding chutes (51) are oppositely arranged along the horizontal direction; the fine adjustment mechanism (5) further comprises fine adjustment sliding blocks (52) which are in sliding fit in the sliding grooves (51), and further comprises fine adjustment rollers (53) which are rotatably supported between the two fine adjustment sliding blocks (52), the plastic paper (01) which bypasses the sliding seat (42) positioned above the fine adjustment mechanism is arranged by bypassing the fine adjustment rollers (53), and the fine adjustment rollers (53) are abutted against the plastic paper (01); the fine adjustment mechanism (5) further comprises a fine adjustment hole (54) formed in the end portion of the sliding groove (51), a fine adjustment screw rod (55) is matched with the inner thread of the fine adjustment hole (54), and the fine adjustment screw rod (55) penetrates through the fine adjustment hole (54) and is rotatably supported on the fine adjustment sliding block (52) at the end portion.

8. The front and back synchronizing system for packing bags according to claim 7, wherein: the fine adjustment mechanism (5) further comprises a fine adjustment handle (56) fixed at the end of the fine adjustment screw rod (55), the fine adjustment handle (56) is circular, and a plurality of notches (561) are uniformly formed in the edge of the fine adjustment handle (56) along the circumferential direction.

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