CN114919271A

CN114919271A - Flat-pressing flat type printing machine with automatic paper turning function

Info

Publication number: CN114919271A
Application number: CN202210865228.1A
Authority: CN
Inventors: 陈来苗; 宋晓辉
Original assignee: Jiangsu Shidai Tianqin Color Packaging Co ltd
Current assignee: Jiangsu Shidai Tianqin Color Packaging Co ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2022-08-19
Anticipated expiration: 2042-07-22
Also published as: CN114919271B

Abstract

The invention discloses a flat-bed press with a paper automatic turn-over function, which comprises a turn-over mechanism, a clamping mechanism and the like, wherein the turn-over mechanism is arranged between a rack and a supporting seat and used for automatically turning over paper, and the clamping mechanism is arranged on the turn-over mechanism and used for clamping the paper. The turnover frame can drive the clamping plate and the limiting column to rotate 180 degrees by controlling the operation of the motor, so that the purpose of automatically turning over the printed single-sided paper can be realized, the paper does not need to be turned over by manual assistance, and the manpower is saved; through the cooperation of spacing post, counter weight ball and first elastic component, can press from both sides tightly spacing to the paper, avoid the paper to drop at the in-process of turn-over, reach the firm purpose of centre gripping.

Description

Flat-pressing flat type printing machine with automatic paper turning function

Technical Field

The invention relates to the technical field of printing, in particular to a flat-pressing flat-type printing machine with an automatic paper turning function.

Background

Because the platen press is a traditional press, images and texts are printed on paper in an embossing mode, in general, after one side of the paper is printed, the paper needs to be turned over by manual assistance so as to print the other side of the paper again.

Through retrieval, patent with patent publication number CN215096267U discloses an automatic plate turning device of a flat-pressing flat-type printing machine, which comprises a rotating roller, wherein one end of the rotating roller is rotatably connected with a rotating vertical adjusting mechanism; the other end of the rotating roller is rotatably sleeved with a gas rotating joint, and the gas rotating joint is slidably provided with a limiting piece; and the rotary roller is fixedly provided with a vacuum sucker which is communicated with the gas rotary joint. Although this patent can realize carrying out automatic reprinting to the paper, when adsorbing the back upset through vacuum adsorption power to the paper, because the paper receives air resistance's influence easy swing to make the contact surface between paper and the vacuum chuck sealed not tight and lead to adsorbing insecurely, make the paper break away from vacuum chuck easily and take place the phenomenon of shifting or droing.

In view of the above, there is a need to improve the defects in the prior art, and to provide a flat-bed printing machine with automatic paper-turning function, which can stably clamp paper when turning over.

Disclosure of Invention

The invention aims to overcome the defects that in the prior art, the clamping is unstable in the paper turning process and the paper is easy to fall off, and the technical problem to be solved by the invention is to provide a flat-pressing flat-type printing machine which can stably clamp the paper and has the automatic paper turning function.

In order to solve the technical problem, the invention provides a flat-pressing flat-type printing machine with a paper automatic turn-over function, which comprises two racks, two supporting seats, a material placing plate and a mounting seat, wherein the number of the racks is two, the two racks are respectively provided with the supporting seats, the material placing plate is respectively arranged on the two supporting seats in a drawing way, one side of each rack is fixedly connected with the mounting seat, the flat-pressing flat-type printing machine also comprises an air cylinder, a guide rod, a connecting seat, a guide rail, a slide block, a printing plate, a turn-over mechanism and a clamping mechanism, the air cylinder is arranged on the mounting seat, the end part of a telescopic rod of the air cylinder is provided with the connecting seat, the mounting seat is fixedly connected with the guide rods at intervals, the guide rods are distributed on two sides of the air cylinder, the slide block is sleeved on each guide rod in a sliding way, the two slide blocks close to one side of the air cylinder are fixedly connected with the connecting seat, the guide rail is arranged on each slide block in a sliding way, the printing plate is arranged between the two guide rails close to the material placing plate, the paper turning mechanism is arranged between the rack and the supporting seat and used for automatically turning paper, and the clamping mechanism is arranged on the paper turning mechanism and used for clamping the paper.

Further, the reprint mechanism is including the bearing frame, and a support, including a motor, an end cap, a controller, and a cover plate, the transmission shaft, roll-over stand and splint, all install the bearing frame on two supporting seats, the bearing frame is located between two blowing boards, the rotary type cover is equipped with the transmission shaft between two bearing frames, the rigid coupling has the roll-over stand on the transmission shaft, the roll-over stand rotates and to assist the paper to carry out automatic turn-over, the one side rigid coupling of keeping away from the transmission shaft on the roll-over stand has splint, it has the notch to open on the splint, install the support between one side of rack and supporting seat, install the motor on the support, the output shaft of motor is connected with the one end of transmission shaft through the shaft coupling.

Furthermore, clamping mechanism includes spacing post, counterweight ball and first elastic component, and the slidable cover is equipped with two piece at least spacing posts on the splint, can keep the parallel and level with the notch laminating after spacing post removes for stabilize the paper centre gripping, the equal rigid coupling of one end that spacing post kept away from each other along the axial has the counterweight ball, all overlaps on every spacing post to be equipped with first elastic component, and the both ends of first elastic component are connected respectively on close splint and spacing post.

Furthermore, the device also comprises a pulling mechanism, the pulling mechanism comprises a fixed seat, a first air cylinder, a first piston column, a second elastic part, a fixed frame, a swinging rod, a connecting frame, a second air cylinder, a second piston column, an air pipe and an arc-shaped push block, the fixed seats are respectively arranged on one side of the two racks close to the air cylinder, the first air cylinders are respectively arranged on the two fixed seats, the first piston column is arranged between the two first air cylinders in a sliding way, the two second elastic parts are respectively sleeved on the first piston column, the two ends of the second elastic parts are respectively connected on the first piston column and the first air cylinder which are close to each other, the fixed frame is fixedly connected on the two sliding blocks close to one side of the first air cylinder, the swinging rods are respectively hinged on the two fixed frames, the connecting frame is arranged on the two guide rails close to one side of the motor, one side of the connecting frame is sleeved on the close swinging rods in a sliding way, the swinging rods can swing up and down through the connecting frame to enable the guide rails and the printing plates to slide, the second inflator is all installed to one side that two mounts kept away from each other, all be connected with trachea and intercommunication between two second inflators and two corresponding first inflators, it is equipped with the second piston post all to slidingtype on two second inflators, wherein connect the trachea on first inflator and keep away from first piston post, the second piston post is kept away from to the trachea of connecting on the second inflator, the equal slidingtype joint of one end that two second piston posts are close to each other is on corresponding swinging arms, the one end rigid coupling of transmission shaft has the arc ejector pad, the rotation of arc ejector pad can promote first piston post and slide.

Furthermore, the automatic ink replenishing device further comprises a smearing mechanism used for automatically replenishing ink, wherein the smearing mechanism comprises strip-shaped plates and a sponge roller, the strip-shaped plates are fixedly connected to the mounting seat at intervals, the sponge roller is rotatably mounted between the two strip-shaped plates on one side close to the mounting seat, and the sponge roller is used for dipping ink on a printing plate.

Furthermore, the clamping device further comprises a limiting block, wherein the two supporting seats are fixedly connected with the limiting block on one side close to each other, and the clamping plate can be contacted with the limiting block after being overturned for limiting the clamping plate.

The technical scheme of the invention has the following beneficial technical effects:

1. the turnover frame can drive the clamping plate and the limiting column to rotate 180 degrees by controlling the operation of the motor, so that the purpose of automatically turning over the printed single-sided paper can be realized, the paper does not need to be turned over by manual assistance, and the manpower is saved; through the cooperation of spacing post, counter weight ball and first elastic component, can press from both sides tightly spacing to the paper, avoid the paper to drop at the in-process of turn-over, reach the firm purpose of centre gripping.

2. Promote first piston post through the arc ejector pad and remove, under first inflator and second inflator mating reaction, can make the automatic sponge cylinder sliding contact who moves forward, the back of printing plate and be stained with chinese ink to reach the automatic purpose of paining chinese ink to the printing plate, let the printing plate can remain normal printing state all the time, avoid appearing the fuzzy phenomenon of printing because of the printing plate lacks chinese ink, thereby can improve the quality to paper printing.

Drawings

Fig. 1 is a schematic perspective view of a first viewing angle according to the present invention.

Fig. 2 is a schematic perspective view of a second perspective view according to the present invention.

Fig. 3 is a partial perspective view of the present invention.

Fig. 4 is a schematic perspective view of a first plate-turning mechanism according to the present invention.

Fig. 5 is a schematic perspective view of a second plate-turning mechanism according to the present invention.

Fig. 6 is a schematic perspective view of the clamping mechanism of the present invention.

Fig. 7 is a first perspective view of the pulling mechanism of the present invention.

Fig. 8 is a perspective view of the second perspective of the pulling mechanism of the present invention.

Fig. 9 is a schematic perspective view of the coating mechanism of the present invention.

The labels in the figures are: 1-a table, 2-a supporting base, 3-a discharging plate, 4-a mounting base, 5-a cylinder, 6-a guide rod, 7-a connecting base, 8-a guide rail, 80-a sliding block, 9-a printing plate, 10-a plate turning mechanism, 101-a bearing base, 102-a support, 103-a motor, 104-a transmission shaft, 105-a turning frame, 106-a clamping plate, 107-a notch, 108-a limiting block, 11-a clamping mechanism, 111-a limiting column, 112-a counterweight ball, 113-a first elastic member, 12-a pulling mechanism, 121-a fixing base, 122-a first air cylinder, 123-a first piston column, 124-a second elastic member, 125-a fixing frame, 126-a swinging rod, 127-a connecting frame, 128-a second air cylinder, 129-a second piston column, 1210-an air pipe, 1211-an arc-shaped push block, 13-an applying mechanism, 131-a strip-shaped plate and 132-a sponge roller.

Detailed Description

The following further describes the technical solution with reference to specific embodiments, and it should be noted that: the words upper, lower, left, right, etc. used herein to indicate orientation are simply for the location of the illustrated structure in the corresponding figures. The serial numbers of the parts are themselves numbered herein, for example: first, second, etc. are used solely to distinguish one from another as to objects described herein, and do not have any sequential or technical meaning. The application states that: the connection and coupling, unless otherwise indicated, include both direct and indirect connections (couplings).

Example 1

A flat-pressing flat-type printing machine with a paper automatic turn-over function is disclosed, and is shown in figures 1-6, and comprises two racks 1, supporting seats 2, material placing plates 3, mounting seats 4, air cylinders 5, guide rods 6, connecting seats 7, guide rails 8, sliders 80, printing plates 9, a turn-over mechanism 10 and clamping mechanisms 11, wherein the number of the racks 1 is two, the supporting seats 2 are respectively mounted at the tops of the two racks 1 through bolts, the material placing plates 3 are respectively mounted on the two supporting seats 2 in a pull-out manner, the material placing plates 3 can be quickly taken out and conveniently cleaned, the mounting seats 4 are fixedly connected to the middle of the rear sides of the racks 1 through bolts, the air cylinders 5 are mounted at the middle parts of the mounting seats 4 through bolts, the connecting seats 7 are bolted to the end parts of telescopic rods of the air cylinders 5, four guide rods 6 are welded on the mounting seats 4 at intervals, each guide rod 6 is sleeved with a sliding type slider 80, and the sliders 80 in the middle are fixedly connected with the connecting seats 7, all slidingtype is equipped with guide rail 8 on every slider 80, all installs the galley 9 between two left guide rails 8 and between two guide rails 8 on right side, is equipped with the reprinting mechanism 10 that conveniently carries out the turn-over to the paper between rack 1 and the supporting seat 2, is equipped with on the reprinting mechanism 10 and can avoids the condition that the paper appears droing when automatic turn-over with the clamping mechanism 11 that the paper centre gripping is firm.

Referring to fig. 1, 2, 4 and 5, a turning mechanism 10 includes a bearing seat 101, a bracket 102, a motor 103, a transmission shaft 104, a roll-over stand 105, a clamping plate 106 and a limiting block 108, the bearing seats 101 are symmetrically bolted on the front and back of the side where two supporting seats 2 are close to each other, the transmission shaft 104 is sleeved between the two bearing seats 101 through a bearing sleeve, the middle part of the transmission shaft 104 is connected with the roll-over stand 105 through a key, the clamping plate 106 is bolted on the side of the roll-over stand 105 far away from the transmission shaft 104, notches 107 are symmetrically opened on the upper and lower sides of the middle part of the inner side of the clamping plate 106, the bracket 102 is installed between the middle position of the upper part of the front side of the rack 1 and the middle position of the front side of the supporting seat 2 through a bolt, the motor 103 is installed on the upper part of the bracket 102 through a bolt, the end part of the output shaft of the motor 103 is connected with the front end of the transmission shaft 104 through a coupler, the middle positions of the upper parts of the sides where two supporting seats 2 are close to each other are fixedly connected with the limiting block 108, the splint 106 can contact with the limiting block 108 after being overturned, and the limiting block 108 can play a limiting role on the splint 106.

Referring to fig. 2 and 6, the clamping mechanism 11 includes a limiting column 111, a counterweight ball 112 and a first elastic member 113, the limiting column 111 is slidably sleeved on the upper and lower sides of the middle portion of the clamping plate 106, the end surface of one side of the limiting column 111, which is far away from the counterweight ball 112, can be aligned with the notch 107, under the cooperation of the limiting column 111 and the first elastic member 113, the paper can be stably clamped when being turned over, the counterweight ball 112 is welded on one end of each of the two limiting columns 111, which is far away from each other along the axial direction, the first elastic member 113 is sleeved on each of the two limiting columns 111, the first elastic member 113 is a metal spring, and the two ends of the first elastic member 113 are respectively connected to the clamping plate 106 and the limiting column 111 which are close to each other.

When the printing machine is used, the cylinder 5 can be started to enable the telescopic rod of the cylinder to extend to drive the connecting seat 7 to slide upwards, the connecting seat 7 drives the sliding block 80, the guide rail 8 and the printing plate 9 to slide upwards together, the printing plate 9 is separated from the discharging plate 3, before paper is placed, the counterweight ball 112 on the upper portion is pulled to move upwards, the first elastic piece 113 on the upper portion is stretched, then the paper can be placed on the discharging plate 3, the paper is located between the inner side of the clamping plate 106 and the two limiting columns 111, the counterweight ball 112 on the upper portion is loosened, the counterweight ball 112 on the upper portion slides downwards under the action of self gravity to be matched with the counterweight ball 112 on the lower portion, the paper can be clamped and fixed through the auxiliary effect of the first elastic piece 113, the paper is prevented from falling off in the process of face turning, and the purpose of stabilizing the paper clamping is achieved. After the paper is placed, the cylinder 5 can be controlled to shorten and reset the telescopic rod, the connecting seat 7 can drive the sliding block 80, the guide rail 8 and the printing plate 9 to slide downwards together, the printing plate 9 can carry out plane type impression printing on the paper, after the single-side printing of the paper is finished, the cylinder 5 can be controlled again to extend the telescopic rod of the cylinder 5 to drive the relevant parts to move upwards, at the moment, the motor 103 can be started to enable the turnover frame 105 to drive the clamping plate 106, the limiting column 111, the counterweight ball 112, the first elastic part 113 and the paper to turn over 180 degrees towards the left side together, so that the side which is not printed on the paper is placed upwards, the purpose of automatically turning the paper is achieved, when the clamping plate 106 is contacted with the limiting block 108 on the left side, the limiting block 108 can play a limiting role on the clamping plate 106, the cylinder 5 is controlled again to shorten and reset the telescopic rod, so that the other side of the paper can be printed, after the two sides of the paper are printed, the air cylinder 5 can be controlled again to extend the telescopic rod of the paper, the counterweight ball 112 located on the upper portion is pulled to move upwards again, the limiting column 111 on the upper portion is separated from the paper, the paper can be taken out, the operation is repeated, automatic paper turning can be achieved, the purpose of double-side printing is achieved, the paper does not need to be turned over through manual assistance, manpower can be saved, and the plane printing efficiency of the paper is improved.

Example 2

On the basis of embodiment 1, referring to fig. 1, 2, 7 and 8, the device further includes a pulling mechanism 12, the pulling mechanism 12 includes a fixing base 121, a first air cylinder 122, a first piston column 123, a second elastic member 124, a fixing frame 125, a swing rod 126, a connecting frame 127, a second air cylinder 128, a second piston column 129, an air pipe 1210 and an arc-shaped pushing block 1211, the fixing base 121 is mounted on one side of the upper portion of the rear side of each of the two racks 1 close to the air cylinder 5 through a bolt, the first air cylinder 122 is mounted on the upper portion of each of the two fixing bases 121 through a clamp, the first piston column 123 is slidably disposed between the front portions of the two first air cylinders 122, the first piston column 123 is U-shaped, the front portion of the first piston column 123 is respectively sleeved with two second elastic members 124, the second elastic members 124 are compression springs, the two ends of the second elastic members 124 are respectively connected to the first piston column 123 and the first air cylinder 122 which are close to each other, fixing frames 125 are welded on the front sides of the two middle sliding blocks 80, the upper parts of the two fixing frames 125 are hinged with swing rods 126, connecting frames 127 are bolted on the front sides of the two middle guide rails 8, the ends, close to each other, of the upper parts of the two connecting frames 127 are sleeved on the close swing rods 126 in a sliding manner, the swing rods 126 can swing up and down to enable the guide rails 8 and the printing plates 9 to slide through the connecting frames 127, second air cylinders 128 are mounted on the sides, far away from each other, of the upper parts of the two fixing frames 125 through hoops, air pipes 1210 are connected and communicated between the front parts of the two second air cylinders 128 and the rear parts of the two corresponding first air cylinders 122, second piston columns 129 are arranged on the rear parts of the two second air cylinders 128 in a sliding manner, the ends, close to each other, of the two second piston columns 129 are clamped on the rear parts of the corresponding swing rods 126 in a sliding manner, and arc-shaped push blocks 1211 are connected at the rear ends of the transmission shafts 104 through keys, the arc-shaped pushing block 1211 can rotate to push the first piston post 123 to slide.

Referring to fig. 1, 2 and 9, the ink-jet printing device further comprises a smearing mechanism 13, wherein the smearing mechanism 13 comprises a strip-shaped plate 131 and a sponge roller 132, the two strip-shaped plates 131 are welded on the front side and the rear side of the top of the mounting seat 4, the sponge roller 132 is rotatably mounted between the upper portions of the two adjacent strip-shaped plates 131, and the sponge roller 132 is used for printing ink on the printing plate 9.

When the control motor 103 is started to turn over the paper, since the telescopic rod of the air cylinder 5 drives the connecting base 7 to move to the upper part of the guide rod 6, so that the printing surface of the printing plate 9 is just level with the highest position of the sponge roller 132, the arc push block 1211 is driven to synchronously rotate through the transmission shaft 104 while the motor 103 is running, the arc push block 1211 pushes the first piston column 123 to slide towards the rear side when rotating, the second elastic element 124 is compressed, so that the air in the first air cylinder 122 is transmitted into the second air cylinder 128 through the air pipe 1210, the second piston column 129 is pushed to slide towards the rear side, the second piston column 129 pulls the rear part of the swing rod 126 to swing upwards, so that the front part of the swing rod 126 swings downwards, the connecting frame 127 pushed by the swing rod 126 drives the guide rail 8 and the printing plate 9 to slide towards the rear side, the slide block 80 plays a role in guiding role on the guide rail 8, so that the printing plate 9 can be in sliding contact with the sponge roller 132 stained with ink when sliding towards the rear side, so that the ink on the sponge roller 132 can be stained on the printing surface of the printing plate 9, when the arc-shaped push block 1211 is separated from the first piston column 123, the first piston column 123 is driven to slide forwards and reset under the action of the second elastic member 124, so that vacuum suction is generated in the first air cylinder 122, the air in the second air cylinder 128 is pumped back into the first air cylinder 122 through the air pipe 1210, the second piston column 129 is driven to slide forwards and reset under the action of the suction, the rear part of the swing rod 126 swings downwards, the front part of the swing rod 126 swings upwards to push the connecting frame 127 on the swing rod to drive the guide rail 8 and the printing plate 9 to slide forwards and reset, the printing surface of the printing plate 9 is in sliding contact with the sponge roller 132 stained with the ink again, the purpose of automatically smearing the ink on the printing plate 9 is achieved, and the printing plate 9 can always maintain a normal printing state, the phenomenon that the printing plate 9 is blurred due to lack of ink during printing is avoided, so that the quality of plane printing on paper can be improved.

The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A flat-pressing flat-type printing machine with a paper automatic turn-over function comprises two racks (1), two supporting seats (2), discharging plates (3) and mounting seats (4), wherein the supporting seats (2) are arranged on the two racks (1), the discharging plates (3) are arranged on the two supporting seats (2) in a drawing mode, the mounting seats (4) are fixedly connected to one sides of the racks (1), and the flat-pressing flat-type printing machine is characterized by further comprising a cylinder (5), a guide rod (6), connecting seats (7), a guide rail (8), a sliding block (80), a printing plate (9), a turn-over mechanism (10) and a clamping mechanism (11), the cylinder (5) is arranged on the mounting seats (4), the connecting seats (7) are arranged at the end part of a telescopic rod of the cylinder (5), the guide rods (6) are fixedly connected to the mounting seats (4) at intervals, and the guide rods (6) are distributed on two sides of the cylinder (5), every guide bar (6) is gone up all to slide type cover and is equipped with slider (80), two slider (80) that are close to cylinder (5) one side all with connecting seat (7) looks rigid coupling, all the slidingtype is equipped with guide rail (8) on every slider (80), all install galley (9) between two guide rails (8) that are close to blowing board (3), be equipped with between rack (1) and supporting seat (2) and turn over version mechanism (10), turn over version mechanism (10) are used for carrying out the turn-over with the paper is automatic, be equipped with clamping mechanism (11) on turn-over version mechanism (10), clamping mechanism (11) are used for grasping the paper.

2. The flat-bed press with the function of automatically turning over paper sheets according to claim 1, wherein the turning mechanism (10) comprises a bearing seat (101), a bracket (102), a motor (103), a transmission shaft (104), a turning frame (105) and a clamping plate (106), the bearing seats (101) are respectively arranged on the two supporting seats (2), the bearing seats (101) are positioned between the two discharging plates (3), the transmission shaft (104) is rotatably sleeved between the two bearing seats (101), the turning frame (105) is fixedly connected onto the transmission shaft (104), the turning frame (105) can assist the paper sheets to automatically turn over when rotating, the clamping plate (106) is fixedly connected onto one side of the turning frame (105) far away from the transmission shaft (104), a notch (107) is formed in the clamping plate (106), the bracket (102) is arranged between one side of the table frame (1) and one side of the supporting seats (2), the motor (103) is arranged on the bracket (102), the output shaft of the motor (103) is connected with one end of the transmission shaft (104) through a coupler.

3. The flat-bed press with the automatic paper turning function according to claim 2, wherein the clamping mechanism (11) comprises a limiting column (111), a counterweight ball (112) and a first elastic member (113), at least two limiting columns (111) are slidably sleeved on the clamping plate (106), the limiting columns (111) can be attached to and kept flush with the notches (107) after moving, the clamping mechanism is used for clamping and stabilizing paper, the counterweight ball (112) is fixedly connected to one ends of the limiting columns (111) which are far away from each other in the axial direction, the first elastic member (113) is sleeved on each limiting column (111), and two ends of the first elastic member (113) are respectively connected to the clamping plate (106) and the limiting column (111) which are close to each other.

4. The platen press with the automatic paper turn-over function as claimed in claim 1, further comprising a pulling mechanism (12), wherein the pulling mechanism (12) comprises a fixing base (121), first air cylinders (122), first piston columns (123), second elastic members (124), a fixing frame (125), a swinging rod (126), a connecting frame (127), second air cylinders (128), second piston columns (129), air pipes (1210) and arc-shaped push blocks (1211), the fixing base (121) is mounted on one side of each of the two platforms (1) close to the air cylinder (5), the first air cylinders (122) are mounted on the two fixing bases (121), the first piston columns (123) are slidably mounted between the two first air cylinders (122), the two second elastic members (124) are respectively sleeved on the first piston columns (123), and two ends of the second elastic members (124) are respectively connected to the first piston columns (123) and the first air cylinders (122) close to each other, fixing frames (125) are fixedly connected to two sliding blocks (80) close to one side of the first air cylinder (122), swing rods (126) are hinged to the two fixing frames (125), connecting frames (127) are mounted on two guide rails (8) close to one side of the motor (103), one side of each connecting frame (127) is sleeved on the corresponding swing rod (126) in a sliding mode, the swing rods (126) can swing up and down to enable the guide rails (8) and the printing plate (9) to slide through the connecting frames (127), second air cylinders (128) are mounted on the sides, far away from each other, of the two fixing frames (125), air pipes (1210) are connected between the two second air cylinders (128) and the two corresponding first air cylinders (122) and communicated with each other, second piston columns (129) are arranged on the two second air cylinders (128) in a sliding mode, wherein the air pipes (1210) connected to the first air cylinders (122) are far away from the first piston columns (123), the air pipe (1210) connected to the second air cylinder (128) is far away from the second piston columns (129), one ends of the two second piston columns (129) close to each other are slidably clamped on the corresponding swing rods (126), one end of the transmission shaft (104) is fixedly connected with an arc-shaped push block (1211), and the arc-shaped push block (1211) can push the first piston column (123) to slide when rotating.

5. The platen press with the automatic paper turning function as claimed in claim 1, further comprising an applying mechanism (13) for automatically supplementing ink, wherein the applying mechanism (13) comprises a strip-shaped plate (131) and a sponge roller (132), the strip-shaped plate (131) is fixedly connected to the mounting seat (4) at intervals, the sponge roller (132) is rotatably mounted between the two strip-shaped plates (131) on one side, and the sponge roller (132) is used for applying ink to the printing plate (9).

6. The flat-bed printing machine with the automatic paper turning function according to claim 2, further comprising a limiting block (108), wherein the limiting block (108) is fixedly connected to one side of each of the two supporting seats (2) close to each other, and the clamping plate (106) can contact with the limiting block (108) after being turned over to limit the clamping plate (106).