CN114684638A - Driving device for paper pressing roller - Google Patents

Abstract

The invention provides a driving device of a paper pressing roller, which comprises a motor, a rack, an upper paper pressing roller, a lower paper pressing roller, a paper conveying table driving shaft and a guide block device, wherein the upper paper pressing roller is arranged on the rack; the motor is arranged on the rack and used for providing power for the rotation of the upper paper pressing roller, the lower paper pressing roller and the paper conveying table driving shaft; the guide block device is arranged on the rack, is connected with the upper paper pressing roller and is used for driving the upper paper pressing roller to vertically slide along the rack. The device can realize real-time constant-speed reverse rotation of the upper paper pressing roller and the lower paper pressing roller, so that paper slipping is avoided, and paper scratching caused by the paper slipping is reduced; the pressure of the upper paper pressing roller and the lower paper pressing roller for extruding the paper is adjustable, so that the problems that the paper is damaged due to overlarge pressure of the upper paper pressing roller and the lower paper pressing roller, or the paper cannot be transmitted due to overlarge pressure are solved; and the upper paper pressing roller, the lower paper pressing roller and the driving shaft of the paper conveying table share the same power source, so that the motion rules can be kept consistent.

Description

Driving device for paper pressing roller

Technical Field

The invention relates to a paper conveying device, in particular to a driving device of a paper pressing roller.

Background

The existing driving device of the paper pressing roller arranged in the die cutting machine presses paper through an upper paper pressing roller and a lower paper pressing roller and conveys the paper by means of friction force between the paper pressing roller and the paper. Aiming at the problems of edge warping and the like commonly existing in the current paper to be die-cut, in order to ensure that the paper can smoothly pass through the paper pressing roller, structures such as a connecting rod or a cam are generally adopted, so that the paper pressing roller can vertically move up and down, but in the structures, because the center distance between the upper paper pressing roller and the lower paper pressing roller is changed in real time, the upper paper pressing roller is generally in an unpowered form, so that the paper which is originally transmitted by means of the combined action of the upper paper pressing roller and the lower paper pressing roller can be caused, the pressure between the upper paper pressing roller and the lower paper pressing roller is overlarge, and the surface is finally collapsed; or the pressure between the upper paper pressing roller and the lower paper pressing roller is too small, and finally the paper cannot be conveyed; and the paper slips and is scratched and other problems caused by different rotating speeds of the upper paper pressing roller and the lower paper pressing roller. Even if an independent power source can be added to the upper paper pressing roller, the deviation is generated due to the driving of different power sources, and the corresponding problems caused by the fact that the rotating speeds of the upper paper pressing roller and the lower paper pressing roller are different still occur.

Disclosure of Invention

The present invention aims to provide a platen roller drive which overcomes the disadvantages of the prior art. The object of the present invention is achieved by the following technical means.

The invention provides a driving device of a paper pressing roller, which comprises:

the paper feeding device comprises a motor, a rack, an upper paper pressing roller, a lower paper pressing roller, a paper feeding platform driving shaft and a guide block device;

the motor is arranged on the rack and is respectively connected with the upper paper pressing roller, the lower paper pressing roller and the paper conveying table driving shaft so as to provide power for the rotation of the upper paper pressing roller, the lower paper pressing roller and the paper conveying table driving shaft;

the guide block device is arranged on the rack and connected with the upper paper pressing roll so as to drive the upper paper pressing roll to vertically slide along the rack.

When the driving device of the paper pressing roller is started, the upper paper pressing roller and the lower paper pressing roller reversely rotate at the same linear speed, the driving shaft of the paper conveying table and the lower paper pressing roller rotate at the same linear speed, and paper contacting with the upper paper pressing roller, the lower paper pressing roller and the driving shaft of the paper conveying table is conveyed to the next procedure through surface friction force; when the thickness of the paper changes, the upper paper pressing roller vertically slides along the rack through the guide block device.

Preferably, the driving device of the paper pressing roller further comprises an upper paper pressing roller driving device, and the upper paper pressing roller driving device is connected with the upper paper pressing roller, the paper conveying table driving shaft and the motor and used for driving the upper paper pressing roller and the paper conveying table driving shaft to reversely rotate at equal linear speeds.

Preferably, the upper platen roller transmission device in the platen roller transmission device adopts synchronous belt transmission.

Preferably, the upper paper pressing roller transmission device comprises an upper paper pressing roller driving belt wheel, a first upper paper pressing roller direction-changing belt wheel, an upper paper pressing roller driven belt wheel, a second upper paper pressing roller direction-changing belt wheel, a tensioning belt wheel, a mounting plate, a double-sided tooth synchronous belt and a roller wheel;

the first upper paper pressing roller bend belt wheel, the upper paper pressing roller driven belt wheel, the second upper paper pressing roller bend belt wheel, the tensioning belt wheel and the idler wheel are all arranged on the mounting plate, and the idler wheel can vertically slide up and down along the rack;

the upper paper pressing roller driving belt wheel, the first upper paper pressing roller direction changing belt wheel, the upper paper pressing roller driven belt wheel, the second upper paper pressing roller direction changing belt wheel and the tensioning belt wheel are connected through a double-sided tooth synchronous belt, so that synchronous belt transmission is realized;

the upper paper pressing roller driven belt wheel is connected with the upper paper pressing roller, and the upper paper pressing roller driving belt wheel drives the upper paper pressing roller to rotate through the upper paper pressing roller driven belt wheel; the number of teeth of the driving belt wheel of the upper paper pressing roller is the same as that of the driven belt wheel of the upper paper pressing roller.

Preferably, the upper paper pressing roller transmission device further comprises a first direction-changing wheel shaft, a second direction-changing wheel shaft and a tensioning wheel shaft;

the first direction changing wheel shaft, the second direction changing wheel shaft and the tensioning wheel shaft are respectively connected with the first upper platen roller direction changing belt wheel, the second upper platen roller direction changing belt wheel and the tensioning belt wheel and are used for rotatably arranging the first upper platen roller direction changing belt wheel, the second upper platen roller direction changing belt wheel and the tensioning belt wheel on the mounting plate;

the first direction changing wheel shaft is also provided with a roller which can be rotatably arranged on the mounting plate, and the axial leads of the first direction changing wheel shaft, the roller and the first upper platen roller direction changing belt wheel are coincided.

Preferably, the guide block device adopts a connecting rod structure to drive the upper platen roller to vertically slide along the rack.

Preferably, the guide block device comprises a first guide block device and a second guide block device, and the first guide block device comprises a guide shaft, a guide frame, a compression spring, a sliding block, a connecting rod and a driving rod;

two ends of the driving rod are respectively hinged with the rack and the connecting rod, one end of the connecting rod, which is far away from the driving rod, is hinged with the guide frame, and the guide frame can vertically slide along the rack;

the sliding block is arranged in the guide frame and can slide up and down along the guide frame, the sliding block is connected with the upper paper pressing roller so as to drive the sliding block to slide up and down along the guide frame, and the upper paper pressing roller can rotate relative to the sliding block; one end of the guide shaft is connected with the sliding block, one end of the guide shaft, which is far away from the sliding block, penetrates through the guide frame and extends to the upper end of the guide frame, the compression spring is arranged outside the guide shaft, so that the guide shaft penetrates through the compression spring, and the compression spring can adjust the compression amount along the extension direction of the guide shaft, so that the pressure between the upper paper pressing roller and the lower paper pressing roller is changed;

the second guide block device comprises a second guide shaft, a second guide frame, a second compression spring and a second sliding block which are respectively symmetrically arranged with the guide shaft, the guide frame, the compression spring and the sliding block and are used for driving the two ends of the upper paper pressing roller to synchronously vertically slide along the rack in a matching manner.

Preferably, the paper pressing roller transmission device further comprises a motor belt pulley, a driving shaft driven belt pulley, a motor transmission synchronous belt and a lower paper pressing roller transmission synchronous belt;

the motor belt wheel is arranged at the output end of the motor and is driven by the motor to rotate, and the motor belt wheel is connected with the driving shaft driven belt wheel through a motor transmission synchronous belt to realize synchronous belt transmission;

the driving shaft driven belt wheel and the lower paper pressing roller driving belt wheel are respectively arranged at one end, close to the motor, of the paper conveying table driving shaft and at the end, far away from the motor, of the paper conveying table driving shaft and are used for driving the paper conveying table driving shaft to rotate;

the lower paper pressing roller is connected with the lower paper pressing roller through a driven belt wheel and is used for driving the lower paper pressing roller to rotate;

the driven belt pulley of the lower paper pressing roller is connected with the driving belt pulley of the lower paper pressing roller through a lower paper pressing roller transmission synchronous belt so as to drive the lower paper pressing roller and the paper conveying table driving shaft to rotate in the same direction at the same linear speed;

the number of teeth of the motor belt wheel is the same as that of the driving shaft driven belt wheel, and the number of teeth of the driving belt wheel of the lower paper pressing roller is the same as that of the driven belt wheel of the lower paper pressing roller.

Preferably, the axes of the upper platen roller and the lower platen roller are located in the same vertical plane.

Preferably, the driving device of the paper pressing roller further comprises an alarm device, the alarm device is connected with the guide block device, when more than one piece of paper enters between the upper paper pressing roller and the lower paper pressing roller, the upper paper pressing roller and the guide block device vertically slide upwards along the rack, and the alarm device is triggered to send an alarm signal.

This dancer roll transmission's advantage lies in: the real-time constant-speed reverse rotation of the upper paper pressing roller and the lower paper pressing roller is realized, the paper is prevented from slipping, and the scratch of the paper caused by the slipping is reduced; the pressure of the upper paper pressing roller and the lower paper pressing roller for extruding the paper is adjustable, so that the problems that the paper is damaged due to overlarge pressure of the upper paper pressing roller and the lower paper pressing roller, or the paper cannot be transmitted due to overlarge pressure are solved; the upper paper pressing roller, the lower paper pressing roller and the driving shaft of the paper conveying table share the same power source, the motion rules can be kept consistent, extra power input caused by the increase of the power of the upper paper pressing roller is avoided, the deviation caused by the driving of different power sources is reduced, and the stability and the service life of equipment are ensured; the whole structure of the device has simple control logic and high equipment reliability.

Drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:

FIG. 1 shows a schematic view of the platen roller drive of the present invention;

FIG. 2 shows a front view of the platen roller drive of the present invention;

FIG. 3 shows a schematic view of the upper platen roller actuator A of FIG. 1;

fig. 4 shows a schematic structural view of the guide block device B in fig. 1.

Detailed Description

Fig. 1-4 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and use the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.

As shown in fig. 1, which is a schematic structural diagram of the driving device of the platen roller of the present invention, fig. 2 is a front view of the driving device of the platen roller of the present invention, wherein 1 is a motor, 2 is a motor base, 3 is a frame, 4 is a connecting member, 5 is an upper platen roller, 6 is a lower platen roller, 7 is a driving shaft of a paper feeding table, 8 is a motor pulley, 9 is a driving shaft driven pulley, 10 is a lower platen roller driven pulley, 11 is a lower platen roller driving pulley, 12 is a motor driving synchronous belt, 13 is a lower platen roller driving synchronous belt, a is an upper platen roller driving device, and B is a guide block device. The motor 1 is arranged on the frame 3 through the motor base 2, and the motor 1 and the motor base 2 as well as the motor base 2 and the frame 3 are fixedly connected. The upper paper pressing roller transmission device A and the second guide block device B' are respectively arranged at two ends of the connecting piece 4.

The upper paper pressing roller 5, the lower paper pressing roller 6 and the paper conveying table driving shaft 7 are arranged on the rack 3 in parallel and can rotate relative to the rack 3, and the axes of the upper paper pressing roller 5 and the lower paper pressing roller 6 are positioned in the same vertical plane. The motor 1 is arranged on the frame 3, and is respectively connected with the upper paper pressing roller 5, the lower paper pressing roller 6 and the paper conveying table driving shaft 7 to provide power for the rotation of the upper paper pressing roller 5, the lower paper pressing roller 6 and the paper conveying table driving shaft 7.

The guide block device is arranged on the frame 3, connected with the upper paper pressing roller 5 and used for driving the upper paper pressing roller 5 to vertically slide along the frame 3.

When the driving device of the paper pressing roller is started, the upper paper pressing roller 5 and the lower paper pressing roller 6 reversely rotate at the same linear velocity, the driving shaft 7 of the paper conveying table and the lower paper pressing roller 6 rotate at the same linear velocity, and paper contacting with the upper paper pressing roller 5, the lower paper pressing roller 6 and the driving shaft 7 of the paper conveying table is conveyed to the next procedure through the friction force on the surface; when the thickness of the paper changes, the upper platen roller 5 slides vertically along the frame 3 by means of the guide block.

As shown in fig. 3, which is a schematic structural diagram of the upper platen roller transmission device a in fig. 1, the upper platen roller transmission device a adopts a synchronous belt transmission, and the upper platen roller transmission device a is connected to the upper platen roller 5, the paper feeding table driving shaft 7 and the motor 1 to drive the upper platen roller 5 and the paper feeding table driving shaft 7 to reversely rotate at equal linear velocity. In fig. 3, a1 is an upper platen driving pulley, a2 is a first upper platen direction changing pulley, A3 is an upper platen driven pulley, a4 is a second upper platen direction changing pulley, a5 is a tensioning pulley, a6 is a first direction changing wheel shaft, a7 is a second direction changing wheel shaft, A8 is a tensioning wheel shaft, a9 is an installation plate, a10 is a double-sided tooth synchronous belt, and a11 is a roller.

The first upper platen roller redirection pulley A2, the upper platen roller driven pulley A3, the second upper platen roller redirection pulley A4, the tensioning pulley A5 and the roller A11 are all arranged on the mounting plate A9, wherein the first redirection wheel shaft A6, the second redirection wheel shaft A7 and the tensioning wheel shaft A8 are respectively connected with the first upper platen roller redirection pulley A2, the second upper platen roller redirection pulley A4 and the tensioning pulley A5, and the first upper platen roller redirection pulley A2, the second upper platen roller redirection pulley A4 and the tensioning pulley A5 are rotatably arranged on the mounting plate A9; the first steering wheel shaft A6 also rotatably arranges a roller A11 on the mounting plate A9, the axial lines of the first steering wheel shaft A6, the roller A11 and the first upper platen roller redirecting pulley A2 are overlapped, and the roller A11 can vertically slide up and down along the frame 3.

The upper paper pressing roller driving pulley A1, the first upper paper pressing roller direction changing pulley A2, the upper paper pressing roller driven pulley A3, the second upper paper pressing roller direction changing pulley A4 and the tensioning pulley A5 are connected through a double-sided tooth synchronous belt A10, synchronous belt transmission is achieved, and then the upper paper pressing roller 5 and the paper conveying table driving shaft 7 are driven to rotate reversely at the same linear speed.

The upper paper pressing roller driven pulley A3 is connected with the upper paper pressing roller 5, and the upper paper pressing roller driving pulley A1 drives the upper paper pressing roller 5 to rotate through the upper paper pressing roller driven pulley A3; the upper platen drive pulley a1 has the same number of teeth as the upper platen driven pulley A3.

As shown in fig. 4, which is a schematic structural diagram of the first guide block device B in fig. 1, here, the guide block device is disposed on the frame 3, and a link structure is adopted to drive the upper platen roller 5 to vertically slide along the frame 3, in fig. 4, B1 is a guide shaft, B2 is a guide frame, B3 is a compression spring, B4 is a slider, B5 is a link, and B6 is a driving lever.

Two ends of the driving rod B6 are respectively hinged with the frame 3 and the connecting rod B5, one end of the connecting rod B5, which is far away from the driving rod B6, is hinged with the guide frame B2, and the guide frame B2 can vertically slide along the frame 3;

the slider B4 is arranged inside the guide frame B2 and can slide up and down along the guide frame B2, the slider B4 is connected with the upper platen roller 5 so as to drive the slider B4 to slide up and down along the guide frame B2, and the upper platen roller 5 can rotate relative to the slider B4; one end of the guide shaft B1 is connected with the slider B4, one end of the guide shaft B1, which is far away from the slider B4, penetrates through the guide frame B2 and extends to the upper end of the guide frame B2, the compression spring B3 is mounted outside the guide shaft B1, the guide shaft B1 penetrates through the compression spring B3, and the compression spring B3 can adjust the compression amount along the extension direction of the guide shaft B1, so that the pressure between the upper platen roller 5 and the lower platen roller 6 is changed.

Correspondingly, the second guide block device B' includes a second guide shaft, a second guide frame, a second compression spring and a second slider, which are respectively symmetrically arranged with the guide shaft B1, the guide frame B2, the compression spring B3 and the slider B4, and are used for driving the two ends of the upper platen roller 5 to synchronously vertically slide along the frame 3 in a matching manner.

As shown in fig. 1-4, the motor belt wheel 8 is arranged at the output end of the motor 1 and is driven by the motor 1 to rotate, and the motor belt wheel 8 is connected with the driving shaft driven belt wheel 9 through a motor transmission synchronous belt 12 to realize synchronous belt transmission; the driving shaft driven belt pulley 9 and the lower paper pressing roller driving belt pulley 11 are respectively arranged at one end of the paper conveying table driving shaft 7 close to the motor 1 and one end of the paper conveying table driving shaft far away from the motor 1 and are used for driving the paper conveying table driving shaft 7 to rotate; the lower paper pressing roller driven belt wheel 10 is connected with the lower paper pressing roller 6 and used for driving the lower paper pressing roller 6 to rotate; the driven belt pulley 10 of the lower paper pressing roller is connected with the driving belt pulley 11 of the lower paper pressing roller through a transmission synchronous belt 13 of the lower paper pressing roller so as to drive the lower paper pressing roller 6 and the driving shaft 7 of the paper conveying platform to rotate in the same direction at the same linear speed. Wherein, the number of teeth of the motor belt wheel 8 is the same as that of the driving shaft driven belt wheel 9, and the number of teeth of the lower paper pressing roller driving belt wheel 11 is the same as that of the lower paper pressing roller driven belt wheel 10.

The driving device of the paper pressing roller is also provided with an alarm device, the alarm device is connected with the guide block device B, when more than one piece of paper enters between the upper paper pressing roller 5 and the lower paper pressing roller 6, the upper paper pressing roller 5 and the guide block device B vertically slide upwards along the rack 3, and the alarm device is triggered to send out an alarm signal.

After the driving device of the paper pressing roller is started, the motor 1 drives the driving shaft 7 of the paper conveying table to rotate through the motor driving synchronous belt 12, the driving shaft 7 of the paper conveying table drives the lower paper pressing roller 6 to rotate through the lower paper pressing roller driving synchronous belt 13, the driving shaft 7 of the paper conveying table drives the upper paper pressing roller 5 to rotate through the double-sided tooth synchronous belt A10, and the upper paper pressing roller 5 and the lower paper pressing roller 6 rotate at a constant speed. The driving rod B6 drives the guide frame B2 to move up and down through the connecting rod B5, the compression spring B3 is in a compression state, the slide block B4 and the guide frame B2 move up and down simultaneously under the action of the compression spring B3, the upper paper pressing roller 5 moves up and down along with the slide block B4, after the upper paper pressing roller 5 moves down to a preset position, the upper paper pressing roller 5 and the lower paper pressing roller 6 can transfer paper to the next procedure in a contrarotating mode, when two pieces of paper enter the middle of the upper paper pressing roller 5 and the lower paper pressing roller 6 simultaneously, the upper paper pressing roller 5 moves upwards to press the compression spring B3, and a system gives an alarm.

The tensioning wheel shaft A8 is an eccentric structure, the tensioning wheel shaft A8 can be rotated to tension the double-sided tooth synchronous belt A10 during installation, the upper platen roller 5 can drive the installation plate A9 to synchronously move up and down, in the up-and-down movement process, the distances among the upper platen roller redirection belt pulley A2, the upper platen roller driven pulley A3, the upper platen roller redirection belt pulley A4 and the tensioning pulley A5 are unchanged, the whole length of the double-sided tooth synchronous belt A10 is basically unchanged, and the upper platen roller driving pulley A1 and the upper platen roller driven pulley A3 are kept in constant speed reverse rotation.

It will of course be realised that whilst the foregoing has been given by way of illustrative example of this invention, all such and other modifications and variations thereto as would be apparent to persons skilled in the art are deemed to fall within the broad scope and ambit of this invention as is herein set forth. Therefore, while this invention has been described with reference to preferred embodiments, it is not intended that the novel apparatus be limited thereby, but on the contrary, it is intended to cover various modifications and equivalent arrangements included within the broad scope of the above disclosure and the appended claims.

Claims (10)

1. A platen roller drive comprising:

the paper feeding device comprises a motor (1), a rack (3), an upper paper pressing roller (5), a lower paper pressing roller (6), a paper feeding table driving shaft (7) and a guide block device;

the upper paper pressing roller (5), the lower paper pressing roller (6) and the paper conveying table driving shaft (7) are arranged on the rack (3) in parallel and can rotate relative to the rack (3), and the motor (1) is arranged on the rack (3), is respectively connected with the upper paper pressing roller (5), the lower paper pressing roller (6) and the paper conveying table driving shaft (7) and is used for providing power for the rotation of the upper paper pressing roller (5), the lower paper pressing roller (6) and the paper conveying table driving shaft (7);

the guide block device is arranged on the rack (3), is connected with the upper paper pressing roller (5) and is used for driving the upper paper pressing roller (5) to vertically slide along the rack (3);

when the driving device of the paper pressing roller is started, the upper paper pressing roller (5) and the lower paper pressing roller (6) reversely rotate at the same linear velocity, the driving shaft (7) of the paper conveying table and the lower paper pressing roller (6) rotate at the same linear velocity in the same direction, and paper contacting with the upper paper pressing roller (5), the lower paper pressing roller (6) and the driving shaft (7) of the paper conveying table is conveyed to the next procedure through the friction force on the surface; when the thickness of the paper changes, the upper paper pressing roller (5) vertically slides along the rack (3) through the guide block device.

2. The platen roller driving device according to claim 1, further comprising an upper platen roller driving device (a) connected to said upper platen roller (5), said paper feeding table driving shaft (7), and said motor (1) for driving said upper platen roller (5) and said paper feeding table driving shaft (7) to rotate in opposite directions at equal linear velocities.

3. Platen roller drive according to claim 2, characterized in that the upper platen roller drive (a) uses a synchronous belt drive.

4. The platen roller drive of claim 3, wherein the upper platen roller drive (A) includes an upper platen roller drive pulley (A1), a first upper platen roller direction changing pulley (A2), an upper platen roller driven pulley (A3), a second upper platen roller direction changing pulley (A4), a tension pulley (A5), a mounting plate (A9), a double-sided toothed timing belt (A10), a roller (A11);

the first upper platen roller redirection belt wheel (A2), the upper platen roller driven belt wheel (A3), the second upper platen roller redirection belt wheel (A4), the tensioning belt wheel (A5) and the idler wheel (A11) are all arranged on the mounting plate (A9), and the idler wheel (A11) can vertically slide up and down along the rack (3);

the upper paper pressing roller driving pulley (A1), the first upper paper pressing roller direction changing pulley (A2), the upper paper pressing roller driven pulley (A3), the second upper paper pressing roller direction changing pulley (A4) and the tensioning pulley (A5) are connected through a double-sided tooth synchronous belt (A10) to achieve synchronous belt transmission;

the upper paper pressing roller driven pulley (A3) is connected with the upper paper pressing roller (5), and the upper paper pressing roller driving pulley (A1) drives the upper paper pressing roller (5) to rotate through the upper paper pressing roller driven pulley (A3); the upper paper pressing roller driving pulley (A1) and the upper paper pressing roller driven pulley (A3) have the same tooth number.

5. The platen roller drive of claim 4, wherein said upper platen roller drive (A) further comprises a first direction changing wheel axle (A6), a second direction changing wheel axle (A7), a tension wheel axle (A8);

the first direction changing wheel shaft (A6), the second direction changing wheel shaft (A7) and the tensioning wheel shaft (A8) are respectively connected with the first upper platen roller direction changing belt wheel (A2), the second upper platen roller direction changing belt wheel (A4) and the tensioning belt wheel (A5) so as to rotatably arrange the first upper platen roller direction changing belt wheel (A2), the second upper platen roller direction changing belt wheel (A4) and the tensioning belt wheel (A5) on the mounting plate (A9);

the first steering wheel shaft (A6) is characterized in that the roller (A11) is rotatably arranged on the mounting plate (A9), and the axial lines of the first steering wheel shaft (A6), the roller (A11) and the first upper platen roller redirecting belt wheel (A2) are overlapped.

6. The platen roller drive of claim 1, wherein said guide block means is of a link structure for vertically sliding said upper platen roller (5) along said frame (3).

7. The platen roller driving device according to claim 6, wherein the guide block means comprises a first guide block means (B) and a second guide block means (B'), the first guide block means (B) comprising a guide shaft (B1), a guide frame (B2), a compression spring (B3), a slider (B4), a link (B5), and a driving lever (B6);

two ends of the driving rod (B6) are respectively hinged with the frame (3) and a connecting rod (B5), one end, far away from the driving rod (B6), of the connecting rod (B5) is hinged with the guide frame (B2), and the guide frame (B2) can vertically slide along the frame (3);

the slider (B4) is arranged in the guide frame (B2) and can slide up and down along the guide frame (B2), the slider (B4) is connected with the upper platen roller (5) so as to drive the slider (B4) to slide up and down along the guide frame (B2), and the upper platen roller (5) can rotate relative to the slider (B4); one end of the guide shaft (B1) is connected with the slider (B4), one end of the guide shaft (B1) far away from the slider (B4) penetrates through the guide frame (B2) and extends to the upper end of the guide frame (B2), the compression spring (B3) is mounted outside the guide shaft (B1), the guide shaft (B1) penetrates through the compression spring (B3), and the compression amount of the compression spring (B3) can be adjusted along the extension direction of the guide shaft (B1);

the second guide block device (B') comprises a second guide shaft, a second guide frame, a second compression spring and a second sliding block which are respectively and symmetrically arranged with the guide shaft (B1), the guide frame (B2), the compression spring (B3) and the sliding block (B4), and is used for driving the two ends of the upper platen roller (5) to synchronously vertically slide along the rack (3) in a matching manner.

8. The platen roller driving device according to claim 1, further comprising a motor pulley (8), a driving shaft driven pulley (9), a motor drive timing belt (12), a lower platen roller drive timing belt (13);

the motor belt wheel (8) is arranged at the output end of the motor (1) and is driven by the motor (1) to rotate, and the motor belt wheel (8) is connected with the driving shaft driven belt wheel (9) through the motor transmission synchronous belt (12) to realize synchronous belt transmission;

the driving shaft driven belt wheel (9) and the lower paper pressing roller driving belt wheel (11) are respectively arranged at one end, close to the motor (1), of the paper conveying table driving shaft (7) and at one end, far away from the motor (1), of the paper conveying table driving shaft and are used for driving the paper conveying table driving shaft (7) to rotate;

the lower paper pressing roller driven belt wheel (10) is connected with the lower paper pressing roller (6) and used for driving the lower paper pressing roller (6) to rotate;

the lower paper pressing roller driven belt pulley (10) is connected with a lower paper pressing roller driving belt pulley (11) through a lower paper pressing roller transmission synchronous belt (13) so as to drive the lower paper pressing roller (6) and the paper conveying table driving shaft (7) to rotate in the same direction at the same linear speed;

the motor belt pulley (8) and the driving shaft driven belt pulley (9) have the same number of teeth, and the lower paper pressing roller driving belt pulley (11) and the lower paper pressing roller driven belt pulley (10) have the same number of teeth.

9. Platen roller drive as claimed in claim 1, characterized in that the axes of the upper platen roller (5) and the lower platen roller (6) are in the same vertical plane.

10. The platen roller drive according to claim 1 further comprising an alarm device connected to said guide block means (B) and wherein when more than one sheet enters between said upper platen roller (5) and said lower platen roller (6), said upper platen roller (5) together with said guide block means (B) slides vertically upwards along said frame (3) triggering said alarm device to emit an alarm signal.

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