阅读说明：本技术 一种准确导向的卷平一体打印机 (accurate-guiding roll-flattening integrated printer ) 是由 张元芳 于 2019-10-11 设计创作，主要内容包括：本发明涉及印刷技术领域,具体涉及一种准确导向的卷平一体打印机。它包括：机架、打印机构、平板送料机构、卷材收放料机构、驱动机构以及导向机构。驱动机构包括：驱动装置、传动装置以及丝杆,丝杆与打印机构传动连接。本实施例通过将驱动机构设置为丝杆和传动装置传动连接的结构,可以带动打印机构的两端在运动过程中可以作同步运动,从而可以防止打印机构的两端产生偏斜,进而保证产品打印的质量。同时,通过设置导向机构,在对平板材料进行打印时,可以先对平板材料的位置进行纠正,防止平板材料在平板送料机构上位置发生偏斜,进而保证对平板材料打印的准确性。(The invention relates to the technical field of printing, in particular to an accurately-guided roll-to-flat integrated printer. It includes: the device comprises a frame, a printing mechanism, a flat feeding mechanism, a coiled material receiving and discharging mechanism, a driving mechanism and a guiding mechanism. The drive mechanism includes: the printing device comprises a driving device, a transmission device and a screw rod, wherein the screw rod is in transmission connection with the printing mechanism. In the embodiment, the driving mechanism is arranged to be in transmission connection with the lead screw and the transmission device, so that the two ends of the printing mechanism can be driven to synchronously move in the movement process, the two ends of the printing mechanism can be prevented from deflecting, and the printing quality of a product is ensured. Meanwhile, by arranging the guide mechanism, when the flat plate material is printed, the position of the flat plate material can be corrected firstly, so that the flat plate material is prevented from being deflected on the flat plate feeding mechanism, and the accuracy of printing the flat plate material is further ensured.)

1. an accurate-guiding roll-flat integrated printer is characterized by comprising:

A frame (10);

the printing mechanism (20) is arranged on the rack (10) and is horizontally connected to the rack (10) in a sliding manner along the extending direction vertical to the rack (10);

A flat plate feeding mechanism (30) arranged on the frame (10) and positioned at one side of the printing mechanism (20);

the coiled material receiving and discharging mechanism (40) is arranged on the rack (10) and is positioned on the other side of the printing mechanism (20);

A driving mechanism (50) which is arranged on the frame (10) and is used for driving the printing mechanism (20) to move; and the number of the first and second groups,

the guide mechanism (60) is arranged on one side of the rack (10) close to the flat plate feeding mechanism (30);

the drive mechanism (50) includes:

a driving device (51) fixedly arranged in the middle of the frame (10);

two transmission devices (52) are arranged and are positioned at two sides of the driving device (51) and are in transmission connection with the driving device (51); and the number of the first and second groups,

the two screw rods (53) are arranged and are positioned on one side, away from the driving device (51), of the transmission device (52) and in transmission connection with the transmission device (52), and the screw rods (53) extend and are distributed along the movement direction of the printing mechanism (20) and are in transmission connection with the printing mechanism (20).

2. The accurately guided roll-to-roll integral printer of claim 1, wherein the transmission (52) comprises:

a transmission shaft center (521) fixed on the frame (10);

a second roller (522) fixed on the transmission shaft center (521) and close to one end of the first roller (512);

a third roller (523) fixed on the transmission shaft center (521) and far away from one end of the first roller (512);

a fourth roller (524) which is fixed on the screw rod (53) and is close to the third roller (523); and the number of the first and second groups,

a first conveyor belt (525) sleeved on the third roller (523) and the fourth roller (524);

The drive device (51) comprises:

A driving motor (511) fixed on the bracket (41) and a first roller (512) coaxially and fixedly connected with a transmission shaft of the driving motor (511); and the number of the first and second groups,

And the second conveyor belt (513) is sleeved on the first roller (512) and the two second rollers (522).

3. the accurately guided roll-to-roll integral printer according to claim 1, wherein the roll take-and-place mechanism (40) comprises:

A bracket (41) embedded on the frame (10);

A supply spool (42) pivotally connected to the carriage (41) and adjacent the printing mechanism (20);

a material receiving roller (43) which is axially connected with the bracket (41) and is far away from the printing mechanism (20); and the number of the first and second groups,

a material receiving motor (44) which is arranged on the bracket (41) and is coaxially and fixedly connected with the material receiving winding drum (43) through a transmission shaft;

the cover is equipped with the coiled material on blowing reel (42), the expansion end of coiled material is fixed on receiving material reel (43).

4. the accurately guided roll-to-roll integral printer according to claim 3, wherein the roll take-up and pay-off mechanism (40) further comprises:

A traction shaft (45) which is arranged between the feeding winding drum (42) and the receiving winding drum (43) and is connected with the bracket (41) in a shaft rotating way; and the number of the first and second groups,

And the traction motor (46) is fixed on the bracket (41) and the transmission shaft is coaxially and fixedly connected with the traction shaft (45).

5. The accurately guided roll-to-roll integral printer according to claim 3, wherein the roll take-up and pay-off mechanism (40) further comprises:

A tensioning shaft (47) which is arranged between the traction shaft (45) and the material receiving winding drum (43) and is connected to the bracket (41) in a sliding manner along the vertical direction; and a tension control device (48) which is fixed on the bracket (41) and is used for driving the tension shaft (47) to move.

6. A correctly guided roll-to-roll integral printer according to claim 5, characterized in that the tension control means (48) comprise:

A tensioning cylinder (481) fixed on the bracket (41); and the number of the first and second groups,

an abutting piece (482) which is connected with the tensioning cylinder (481) in a transmission way and is used for driving the tensioning shaft (47).

7. the accurately guided roll-to-roll integral printer of claim 6, wherein the push (482) comprises:

A pushing block (4821) fixedly connected with the movable shaft of the tensioning cylinder (481); and the number of the first and second groups,

The rotating shaft is connected with a pushing roller (4822) which is close to one side of the tensioning shaft (47) and connected with the pushing block (4821).

8. the accurately guided roll-to-roll integral printer according to claim 7, wherein the roll take-up and pay-off mechanism (40) further comprises: a printing plate (49) mounted on the support (41) between the supply reel (42) and the tensioning shaft (47), a side of the printing plate (49) adjacent to the printing mechanism (20) being arranged as a plane.

9. The accurately guided roll-to-roll integral printer of claim 1, wherein the guide mechanism (60) comprises:

a guide frame (61) matched with the frame (10); and the number of the first and second groups,

and guide wheels (61) which are distributed along the horizontal direction and are axially connected with the guide frame (61), wherein the extension direction of the guide wheels (61) is vertical to the movement direction of the printing mechanism (20).

Technical Field

the invention relates to the technical field of printing, in particular to an accurately-guided roll-to-flat integrated printer.

Background

a roll-to-roll printer is a multi-function printer that can print both flat sheet material and roll material, and generally includes a printing mechanism, a flat sheet feeding mechanism, and a roll material feeding mechanism. To avoid interference between the sheet material and the web, a roll-to-roll printer typically places the web feed mechanism and the platen feed mechanism at opposite ends of the printing mechanism. In the process of printing the coiled material and the flat plate material, the printing mechanism needs to be driven to move to the coiled material feeding mechanism or the flat plate feeding mechanism respectively.

However, in the process of driving the printing mechanism, the driving mechanisms are generally required to be respectively arranged at two ends of the printing mechanism, so that the two driving mechanisms cannot be ensured to simultaneously run and stop in the driving process, and therefore, the printing mechanism may be skewed, and the printing quality is affected;

Meanwhile, when the flat material is directly placed on the flat feeding mechanism in use, the flat material is directly conveyed to the printing range by the flat feeding mechanism under the condition that the flat material does not correspond to a good direction, so that the printing position of the flat material is wrong, and the printing quality is further influenced.

there is therefore a need for a properly guided roll-to-roll integrated printer that maintains the synchronous movement of the two ends of the printing mechanism.

Disclosure of Invention

The invention aims to overcome the defects and shortcomings of the prior art and provide an accurately-guided roll-flat integral printer which has the advantage of keeping the two ends of a printing mechanism to move synchronously.

in order to achieve the purpose, the invention adopts the technical scheme that:

a precision guided roll-to-roll all-in-one printer comprising:

a frame;

The printing mechanism is arranged on the rack and is horizontally connected to the rack in a sliding manner along the extending direction vertical to the rack;

the flat plate feeding mechanism is arranged on the rack and positioned on one side of the printing mechanism;

the coiled material receiving and discharging mechanism is arranged on the rack and positioned on the other side of the printing mechanism; and the number of the first and second groups,

the driving mechanism is arranged on the frame and used for driving the printing mechanism to move; and the number of the first and second groups,

the guide mechanism is arranged on one side of the rack close to the flat plate feeding mechanism;

The drive mechanism includes:

The driving device is fixedly arranged in the middle of the rack;

two transmission devices are arranged, are positioned at two sides of the driving device and are in transmission connection with the driving device; and the number of the first and second groups,

Set up to two, all be located transmission and keep away from drive arrangement one side and with the lead screw that transmission is connected, the lead screw extends the distribution and is connected with printing mechanism transmission along printing mechanism's direction of motion.

preferably, the transmission means comprises:

A transmission axis fixed on the frame;

the second roller is fixed on the transmission shaft center and is close to one end of the first roller;

The third roller is fixed on the transmission shaft center and is far away from one end of the first roller;

the fourth roller is fixed on the screw rod and is close to the third roller; and the number of the first and second groups,

The first conveying belt is sleeved on the third roller and the fourth roller;

the driving device includes:

the driving motor is fixed on the bracket, and the first roller is coaxially and fixedly connected with a transmission shaft of the driving motor; and the number of the first and second groups,

and the second conveyor belt is sleeved on the first roller and the two second rollers.

preferably, the coiled material receiving and discharging mechanism comprises:

The bracket and the discharging winding drum are rotationally connected with the bracket and are close to the printing mechanism;

The receiving winding drum is rotationally connected with the support and is far away from the printing mechanism; and the number of the first and second groups,

The material receiving motor is arranged on the bracket and is coaxially and fixedly connected with the material receiving winding drum through the transmission shaft;

The cover is equipped with the coiled material on the blowing reel, the expansion end of coiled material is fixed on receiving the material reel.

Preferably, the coiled material receiving and discharging mechanism further comprises:

the traction shaft is arranged between the feeding winding drum and the receiving winding drum and is in shaft rotating connection with the bracket; and the number of the first and second groups,

and the traction motor is fixed on the bracket and is coaxially and fixedly connected with the transmission shaft and the traction shaft.

preferably, the coiled material receiving and discharging mechanism further comprises:

the tensioning shaft is arranged between the traction shaft and the material receiving winding drum and is connected to the support in a sliding mode along the vertical direction; and the tension control device is fixed on the bracket and used for driving the tension shaft to move.

Preferably, the tension control device includes:

A tensioning cylinder fixed on the bracket; and the number of the first and second groups,

and the pushing piece is in transmission connection with the tensioning cylinder and is used for driving the tensioning shaft.

preferably, the pushing member includes:

the pushing block is fixedly connected with the movable shaft of the tensioning cylinder; and the number of the first and second groups,

The rotating shaft is connected with the pushing block and is positioned on the pushing roller close to one side of the tensioning shaft.

preferably, the coiled material receiving and discharging mechanism further comprises: the printing plate is assembled on the support and located between the discharging winding drum and the tensioning shaft, and one side face, close to the printing mechanism, of the printing plate is set to be a plane.

preferably, the guide mechanism includes:

a guide frame matched with the frame; and the number of the first and second groups,

and the guide wheels are distributed along the horizontal direction and are axially connected to the guide frame in a rotating mode, and the extension direction of the guide wheels is perpendicular to the movement direction of the printing mechanism.

after the technical scheme is adopted, the invention has the beneficial effects that:

in the embodiment, the driving mechanism is arranged to be in transmission connection with the lead screw and the transmission device, so that the two ends of the printing mechanism can be driven to synchronously move in the movement process, the two ends of the printing mechanism can be prevented from deflecting, and the printing quality of a product is ensured. Meanwhile, by arranging the guide mechanism, when the flat plate material is printed, the position of the flat plate material can be corrected firstly, so that the flat plate material is prevented from being deflected on the flat plate feeding mechanism, and the accuracy of printing the flat plate material is further ensured.

drawings

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the frame, printing mechanism and coil receiving and dispensing mechanism of the present invention;

FIG. 3 is an exploded view of the carriage, printing mechanism and drive mechanism of the present invention;

FIG. 4 is an exploded view of the housing and drive mechanism of the present invention;

FIG. 5 is a schematic view of the structure of the driving device of the present invention;

FIG. 6 is a schematic structural view of the transmission of the present invention;

FIG. 7 is a schematic structural view of the coil winding and unwinding mechanism of the present invention;

FIG. 8 is a cross-sectional view taken along the line X-X in FIG. 7;

FIG. 9 is a view showing a state of use of the coil winding and unwinding mechanism of the present invention;

FIG. 10 is an enlarged view of area A of FIG. 8;

FIG. 11 is a schematic structural view of the guide mechanism of the present invention;

FIG. 12 is an enlarged view of the area in FIG. 11;

Description of reference numerals: 10. a frame; 20. a printing mechanism; 30. a plate feeding mechanism; 40. a coiled material receiving and discharging mechanism; 41. a support; 42. a feeding reel; 43. a material receiving reel; 44. a material receiving motor; 45. a traction shaft; 46. a traction motor; 47. tensioning the shaft; 48. a tension control device; 481. a tensioning cylinder; 482. a pushing member; 4821. pushing the block; 4822. pushing the roller; 49. printing a plate; 50. a drive mechanism; 51. a drive device; 511. a drive motor; 512. a first roller; 513. a second conveyor belt; 52. a transmission device; 521. a transmission axis; 522. a second roller; 523. a third roller; 524. a fourth roller; 525. a first conveyor belt; 53. a screw rod; 60. a guide mechanism; 61. a guide frame; 62. a guide wheel.

Detailed Description

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

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment as necessary without making a contribution thereto after reading the present specification, but all are protected by patent laws within the scope of the claims of the present invention.

As shown in fig. 1-12, the present invention relates to a precisely guided roll-to-roll integrated printer comprising: a frame 10. A printing mechanism 20 disposed on the frame 10 and horizontally slidably coupled to the frame 10 in a direction perpendicular to the extending direction of the frame 10. And a plate feeding mechanism 30 disposed on the frame 10 and located at one side of the printing mechanism 20. And a web receiving and discharging mechanism 40 provided on the frame 10 and located on the other side of the printing mechanism 20. And a driving mechanism 50 disposed on the frame 10 for driving the printing mechanism 20 to move. And a guide mechanism 60 provided on a side of the frame 10 adjacent to the flat feeding mechanism 30. The drive mechanism 50 includes: and a driving device 51 fixedly arranged at the middle part of the frame 10. And the transmission devices 52 are arranged in two and are positioned on two sides of the driving device 51 and are in transmission connection with the driving device 51. Two lead screws 53 are arranged, are positioned on one side of the transmission device 52 far away from the driving device 51 and are in transmission connection with the transmission device 52, and the lead screws 53 extend and are distributed along the movement direction of the printing mechanism 20 and are in transmission connection with the printing mechanism 20. Based on above structure, the flatting integrative printer of accurate direction of this embodiment is in the use. When printing the flat material: the flat plate material is placed on the guide mechanism 60, the flat plate material is pushed onto the flat plate feeding mechanism 30 after being positioned, the printing mechanism 20 is driven by the driving mechanism 50 to move to one end of the flat plate feeding mechanism 30 on the rack 10, and finally the flat plate is printed by the printing mechanism 20. When printing on a web: the coiled material is placed on the coiled material receiving and discharging mechanism 40, the driving mechanism 50 is used for driving the printing mechanism 20 to move on the frame 10 to the movement range of the coiled material, and the coiled material is received and discharged and simultaneously printed by the printing mechanism 20. Because the driving mechanism 50 starts the motor and drives the transmission device 52 to operate when driving the printing mechanism 20 to move; the transmission device 52 is in transmission connection with the screw rod 53, so that the screw rods 53 positioned at two sides of the frame 10 can be synchronously rotated; finally, since the two ends of the printing mechanism 20 are in transmission connection with the lead screws 53, the two lead screws 53 can drive the two ends of the printing mechanism 20 to synchronously move in the rotating process. Based on this, the driving mechanism 50 is set to be a structure consisting of the driving device 51, the transmission device 52 and the screw rods 53, and the driving device 51 is started, so that the two screw rods 53 can be driven to synchronously move at the same time, thereby ensuring that the two ends of the printing mechanism 20 synchronously move, preventing the two ends of the printing mechanism 20 from generating deflection, and further ensuring the printing quality of the product. Meanwhile, by arranging the guide mechanism 60, when the flat plate material is printed, the position of the flat plate material can be corrected firstly, so that the flat plate material is prevented from deviating on the flat plate feeding mechanism 30, and the printing accuracy of the flat plate material is further ensured.

to ensure the function and effect of the driving mechanism 50, the transmission 52 of the present embodiment includes: a transmission shaft 521 fixed on the frame 10. And a second roller 522 fixed on the transmission shaft center 521 and close to one end of the first roller 512. And the third roller 523 is fixed on the transmission shaft center 521 and is far away from one end of the first roller 512. A fourth roller 524 fixed to the lead screw 53 and adjacent to the third roller 523. And a first conveyor belt 525 sleeved on the third roller 523 and the fourth roller 524. The drive device 51 includes: a driving motor 511 fixed on the bracket 41 and a first roller 512 coaxially and fixedly connected with a transmission shaft of the driving motor 511. And a second conveyor belt 513 sleeved on the first roller 512 and the two second rollers 522. Based on above structure, start driving motor 511 and drive first running roller 512 and rotate, owing to overlap on first running roller 512 and two second running rollers 522 and be equipped with second conveyer belt 513, consequently, first running roller 512 can drive two second running rollers 522 rotations simultaneously at the rotation in-process. Afterwards, since the second roller 522 is sleeved on the transmission axis 521 and the other end of the transmission axis 521 is sleeved with the third roller 523, the second roller 522 can drive the third roller 523 to rotate in the rotation process. Afterwards, since the first conveyor belt 525 is sleeved on the third roller 523 and the fourth roller 524, the fourth roller 524 can be driven to rotate during the rotation of the third roller 523. Finally, the fourth roller 524 is sleeved on the lead screw 53, so that the fourth roller 524 can drive the lead screw 53 to rotate in the rotating process, and the lead screw 53 is in transmission connection with the printing mechanism 20, so that the lead screw 53 can drive the printing mechanism 20 to relatively slide along the extending direction of the lead screw 53 in the rotating process.

to ensure the use of the coil material receiving and discharging mechanism 40, the coil material receiving and discharging mechanism 40 of the present embodiment includes: a bracket 41. Pivotally connected to the carriage 41 and adjacent to the discharge roller 42 of the printing mechanism 20. A material receiving roller 43 pivotally connected to the bracket 41 and far away from the printing mechanism 20, and a material receiving motor 44 disposed on the bracket 41 and having a driving shaft coaxially and fixedly connected to the material receiving roller 43. The material feeding reel 42 is sleeved with a coiled material, and the movable end of the coiled material is fixed on the material receiving reel 43. Based on the above structure, the receiving motor 44 is started to drive the receiving winding drum 43 to rotate, and since the coiled material is sleeved on the discharging winding drum 42 and the movable end of the coiled material is fixed on the receiving winding drum 43, the discharging winding drum 42 can be driven to rotate at the same time, and the discharging winding drum 42 releases the coiled material in the rotating process. Therefore, the coiled material collecting and releasing process can be realized by using one motor, the structure of the coiled material collecting and releasing mechanism 40 is simplified, and the assembly and the maintenance are convenient for workers. In addition, receive material motor 44 and rotate the in-process, receive material reel 43 and retrieve the coiled material and can drive blowing reel 42 and release the coiled material simultaneously to guarantee the synchronism that the coiled material receive and releases, and then can avoid the coiled material to produce fold, folding scheduling problem.

For the coiled material release with retrieve the in-process and receive material motor 44 power not enough, the drop feed mechanism 40 is received to the coiled material of this embodiment still includes: a drawing shaft 45 which is arranged between the discharging roller 42 and the receiving roller 43 and is pivotally connected to the bracket 41. And a traction motor 46 fixed on the bracket 41 and fixedly connected with the transmission shaft and the traction shaft 45 coaxially. Based on above structure, start receipts material motor 44 and traction motor 46 simultaneously (make receipts material motor 44 the same with traction motor 46's operation direction) in work, can strengthen the drive power to the coiled material to can avoid receiving the not enough problem of material motor 44 power, guarantee to the release and the recovery of coiled material.

For preventing that the coiled material from producing curly, cause the printing unclear, rolling overlapping scheduling problem, the drop feed mechanism 40 is received to the coiled material of this embodiment still includes: a tension shaft 47 provided between the pulling shaft 45 and the receiving drum 43 and slidably connected to the bracket 41 in the vertical direction. And a tension control device 48 fixed on the bracket 41 and used for driving the tension shaft 47 to move. Based on above structure, utilize tension control device 48 drive tensioning axle 47 and coiled material butt to the coiled material that the messenger is located between receipts material reel 43 and blowing reel 42 is in the tensioning state all the time, thereby can avoid printing mechanism 20 to take place to curl the coiled material to the coiled material printing in-process (prevent that the coiled material from producing the change because of curling the position), thereby guarantees the quality that the coiled material printed.

To ensure the function and effect of the tension control device 48, the tension control device 48 of the present embodiment includes: a tensioning cylinder 481 fixed to the support 41. And an abutting piece 482 which is in transmission connection with the tensioning cylinder 481 and is used for driving the tensioning shaft 47. Based on above structure, to the coiled material of difference, support pushing away piece 482 along vertical direction motion and then drive tensioning axle 47 motion through the drive of start-up tensioning cylinder 481 to can adjust the size of the power that tensioning axle 47 acted on the coiled material, make the coiled material can keep the tensioning state, can avoid coiled material and tensioning axle 47 frictional force too big simultaneously to lead to the coiled material to stop the rolling.

In order to reduce the friction between the pushing part 482 and the tensioning shaft 47, the pushing part 482 of the present embodiment includes: and the abutting block 4821 is fixedly connected with the movable shaft of the tensioning cylinder 481. And a pushing roller 4822 connected to the pushing block 4821 and located near the tension shaft 47. Based on the above structure, by setting the pushing part 482 as the pushing block 4821 and the pushing roller 4822 and using the pushing roller 4822 to push the tensioning shaft 47, the pushing roller 4822 and the tensioning shaft 47 are always in relative sliding, so as to avoid rolling friction between the pushing roller 4822 and the tensioning shaft 47, thereby reducing friction between the pushing part 482 and the tensioning shaft 47, and facilitating rolling of the coil.

in order to ensure that the coiled material is always horizontal in the printing process, the coiled material receiving and discharging mechanism 40 of the embodiment further comprises: a printing plate 49 mounted on the support 41 between the supply roll 42 and the tension shaft 47, a side of the printing plate 49 adjacent to the printing mechanism 20 being arranged as a plane. Based on the above structure, by providing the printing plate 49, the roll material is released from the feeding roll 42, sequentially passes through the printing plate 49, the pulling shaft 45 and the tensioning shaft 47, and is finally fixed on the receiving roll 43. In use, by driving the printing mechanism 20 within the profile of the printing plate 49, the printing mechanism 20 can be caused to correspond to the position of the web to be printed on during printing by the printing mechanism 20 since the web on the printing plate 49 is always kept horizontal, thereby ensuring the printing effect.

to ensure the accuracy of printing on the flat material, the guide mechanism 60 of the present embodiment includes: a guide frame 61 matched with the frame 10; and guide wheels 62 which are distributed in the horizontal direction and are pivotally connected to the guide frame 61, the extending direction of the guide wheels 62 being perpendicular to the moving direction of the printing mechanism 20. Based on above mechanism, when printing dull and stereotyped material: the flat material is slid onto the flat feeding mechanism 30 after the position of the flat material is adjusted by placing the flat material on the guide wheels 62. Since the guide wheels 62 are horizontally arranged and extend in a direction perpendicular to the moving direction of the printing mechanism 20, the flat material always moves linearly in the extending direction of the frame 10 when sliding from the guide frame 61 onto the flat feeding mechanism 30, so that the flat material can be prevented from shifting, and the printing accuracy of the flat material can be ensured.

the above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered by the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.