CN111016454A

CN111016454A - Novel printing equipment production line

Info

Publication number: CN111016454A
Application number: CN201911209299.0A
Authority: CN
Inventors: 何大碧
Original assignee: Zhejiang Juxin Technology Co Ltd
Current assignee: Zhejiang Juxin Technology Co Ltd
Priority date: 2019-11-30
Filing date: 2019-11-30
Publication date: 2020-04-17

Abstract

The invention relates to a novel printing equipment production line which comprises a feeding mechanism for providing a product to be printed, a digital printing machine for printing the product to be printed, a drying mechanism for drying the printed product and a double-shaft cloth rolling mechanism for rolling the printed product, wherein the feeding mechanism, the digital printing machine, the drying mechanism and the double-shaft cloth rolling mechanism are sequentially arranged and installed.

Description

Novel printing equipment production line

Technical Field

The invention belongs to the technical field of printing, and relates to a novel printing equipment production line.

Background

The printing is a processing process of printing required patterns and designs on each plane material by using one or more dyes or pigments with different colors through a printing device.

The existing printing and drying are usually carried out step by step, and the digital printing paper product which is just printed is usually dried by spreading, so that the method has many defects. Secondly, spreading the printing paper for drying, and occupying a large area; after ten times of airing, people need to collect and arrange the printing paper, so that the arrangement efficiency is low, the time is long, and the integrity is poor.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a water-saving screen washing device for a printing machine, which can fully utilize water resources.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a novel printing equipment production line, including the feed mechanism that is used for providing the product of waiting to stamp, be used for the printing to wait digital printing machine of stamp product, be used for drying the stoving mechanism of stamp product and the biax batching mechanism of rolling stamp product, feed mechanism, digital printing machine, stoving mechanism, biax batching mechanism arrange the installation in proper order.

In the novel printing equipment production line, the drying mechanism comprises a shell, a transmission mechanism horizontally arranged in the shell and used for transmitting the product to be dried, and a heat source pipeline communicated with the shell, an inlet and an outlet of a product to be dried are respectively arranged at two sides of the shell, a drying pipeline is arranged above the transmission mechanism, the drying pipeline is provided with a plurality of hot air outlets, two ends of the drying pipeline are communicated with an air inlet machine for air inlet, the two air inlet machines are arranged, the heat source pipeline is positioned at one side of the air inlet machine air inlet, the air outlets of the two air inlet machines are respectively communicated with the two ends of the drying pipeline, the top of stoving pipeline still is equipped with exhaust mechanism, exhaust mechanism including setting up in the blast pipe of stoving pipeline top, blast pipe one end be located stoving pipeline top, the other end is equipped with the air exhauster. Through the arrangement of the heat source pipeline, the air inlet machine and the drying pipeline, the printing paper on the conveying device can be quickly dried through mutual matching of the heat source pipeline, the air inlet machine and the drying pipeline, and the drying effect is good; set up exhaust mechanism and can effectively absorb the inside hot steam of casing, thereby avoid hot steam to meet cold liquefaction and drip on the calico paper and influence the stamp effect.

In foretell novel printing equipment production line, transmission device include two parallels and rotate in the transmission roller of casing, set up the drive belt between the transmission roller and be used for driving transmission roller pivoted first driving motor, first driving motor's output and one of them transmission roller fixed connection. The conveying roller is used for conveying the product to be dried.

At foretell novel printing equipment production line, feed mechanism include the feed frame, be provided with the input roller that is used for the transmission to treat the printing product on the feed frame, be provided with the feed mechanism who is used for providing the scroll on the feed frame, one side of feed frame is provided with drive feed mechanism pivoted second driving motor, one side of feed mechanism still is provided with and is used for real-time detection to treat the induction mechanism of printing product rate of tension, feed frame one side still is provided with the PLC control box, the PLC control box can be according to induction mechanism feedback signal regulation second driving motor's rotational speed in order to adjust the rotational speed of feed mechanism.

At foretell novel printing equipment production line, feed mechanism including the symmetry set up first safe chuck between the feed frame, set up the feed roller between first safe chuck, first safe chuck rotate to be connected in the feed frame, the feed roller can be dismantled in first safe chuck, second driving motor's output and one of them first safe chuck fixed connection. When the paper roll on the feeding roller is used up, the feeding roller is convenient for workers to replace quickly.

At foretell novel printing equipment production line, response mechanism including symmetry fixed mounting shift ware, connecting rod and the tensioning roller on the feed frame, the connecting rod has two and rotates respectively and connect in the ware that shifts of both sides, the tensioning roller rotates between the connecting rod and is located the connecting rod and keeps away from one side of the ware that shifts, the ware that shifts be used for the position change of real-time supervision connecting rod and feed back to the PLC controller.

At foretell novel printing equipment production line, biax batching mechanism include the rolling frame, be provided with a plurality of output rollers that are used for the transmission to wait to roll up the product on the rolling frame, transmission device's rear side sets up incessant coiling mechanism, incessant coiling mechanism is including rotating the rotating turret, two and above the coiling mechanism that set up on the rotating turret that connect in the rolling frame and being used for driving coiling mechanism pivoted third driving motor, incessant coiling mechanism is still including being used for driving the rotating turret and rotating the actuating mechanism in order to switch the coiling mechanism position.

In foretell novel printing equipment production line, actuating mechanism include cylinder, the rack of fixed mounting at the cylinder output on the horizontal fixed mounting rolling frame, the center pin of rotating turret runs through rolling frame and fixed mounting has the gear, gear and rack on the tooth mesh mutually. When one of the rolling mechanisms on the rotating frame is fully rolled, the air cylinder is started, the output end of the air cylinder extends to drive the rack, teeth on the rack are meshed with the gear, so that the gear is driven to rotate, the gear drives the rotating frame to rotate 180 degrees, and the rolling mechanisms on the rotating frame are switched.

At foretell novel printing equipment production line, winding mechanism including the symmetry set up the safe chuck of second between the rotating turret, set up the biax cloth roller between the safe chuck of second, the biax cloth roller can be dismantled in the safe chuck of second, third driving motor's output and the safe chuck fixed connection of second of one side wherein.

In the production line of the novel printing equipment, the novel printing equipment method comprises the following steps:

s1, feeding: installing a feeding roller with rolled printing paper between first safety chucks for feeding, transmitting the paper to be printed into a digital printing machine, and in the transmission process, sensing the tension of the paper to be printed by a sensing mechanism in real time to automatically adjust the transmission speed;

s2, printing: printing the transmitted paper by a digital printing machine;

s3, drying: the drying mechanism is used for drying the printed paper;

s4, rolling: the printing paper after the stoving is rolled up to the mechanism of rolling up of brushing, and when one of them winding mechanism rolling on the rotating turret was full of the product, the cylinder started, and the output extension of cylinder drove the rack, and tooth and gear on the rack engaged with drive gear revolve, and the gear drives the rotating turret and rotates 180 degrees, switches the winding mechanism on the rotating turret, and incessant rolling is carried out to printing paper.

Compared with the prior art, the feeding mechanism, the digital printing machine, the drying mechanism and the double-shaft cloth rolling mechanism are sequentially arranged, so that a product to be printed can be directly dried and rolled after printing is finished, the whole production line is more integral, a large amount of time spent in step-by-step printing, drying and rolling is avoided, and the time cost is saved.

Drawings

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

FIG. 2 is a top view of the present invention;

FIG. 3 is a front view of the feed mechanism of the present invention;

FIG. 4 is a top view of the feed mechanism of the present invention;

FIG. 5 is a front view of the dual spindle cloth winding mechanism of the present invention;

FIG. 6 is a top view of the dual spindle cloth winding mechanism of the present invention;

FIG. 7 is a front cross-sectional view of the drying mechanism of the present invention;

FIG. 8 is a side cross-sectional top view of the drying mechanism of the present invention; .

In the figure, 1, a feeding mechanism; 11. a feeding frame; 12. an input roller; 13. a supply assembly; 131. a first safety chuck; 132. a feed roll; 133. a second drive motor; 14. an induction mechanism; 141. a positioner; 142. a connecting rod; 143. a tension roller; 15. a PLC control box; 2. a digital printing machine; 3. a drying mechanism; 31. a housing; 32. a heat source pipeline; 33. an inlet; 34. an outlet; 35. drying the pipeline; 36. a hot air outlet; 37. an air inlet machine; 38. an exhaust mechanism; 381. an exhaust pipe; 382. an exhaust fan; 39. a transport mechanism; 391. a transfer roller; 392. a transmission belt; 393. a first drive motor; 4. a double-shaft cloth rolling mechanism; 41. a winding frame; 42. an output roller; 43. an uninterrupted winding device; 431. a rotating frame; 432. a third drive motor; 433. a winding mechanism; 4331. a second safety chuck; 4332. a double-shaft cloth roller; 44. a drive mechanism; 441. a cylinder; 442. a rack; 443. a gear.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, a novel printing equipment production line comprises a feeding mechanism 1 for providing a product to be printed, a digital printing machine 2 for printing the product to be printed, a drying mechanism 3 for drying the printed product, and a double-shaft cloth rolling mechanism 4 for rolling the printed product, wherein the feeding mechanism 1, the digital printing machine 2, the drying mechanism 3, and the double-shaft cloth rolling mechanism 4 are sequentially arranged and installed.

As shown in fig. 3 and 2, the feeding mechanism 1 includes a feeding frame 11, an input roller 12 for transmitting a product to be printed is disposed on the feeding frame 11, a feeding mechanism for providing a paper roll is disposed on the feeding frame 11, the feeding mechanism includes first safety chucks 131 symmetrically disposed between the feeding frames 11, and a feeding roller 132 disposed between the first safety chucks 131, the first safety chucks 131 are rotatably connected to the feeding frame 11, the feeding roller 132 is detachable from the safety chucks, and an output end of the second driving motor 133 is fixedly connected to one of the first safety chucks 131. When the roll is depleted from the supply roll 132, it is convenient for a worker to quickly replace the supply roll 132.

One side of feed frame 11 is provided with drive feeding mechanism pivoted second driving motor 133, one side of feeding mechanism still is provided with the induction mechanism 14 that is used for real-time detection to treat the printing product rate of tension, induction mechanism 14 includes the ware 141 that shifts of symmetry fixed mounting on feed frame 11, connecting rod 142 and tensioning roller 143, connecting rod 142 has two and rotates respectively and connects in the ware 141 that shifts of both sides, tensioning roller 143 rotates between connecting rod 142 and is located one side that the ware 141 that shifts was kept away from to connecting rod 142, feed frame 11 one side still is provided with PLC control box 15, the ware 141 that shifts is used for real-time supervision connecting rod 142's position change and feeds back to PLC controller, PLC control box 15 can adjust the rotational speed of second driving motor 133 in order to adjust the feeding mechanism rotational speed according to induction mechanism 14 feedback signal.

As shown in FIG. 1, the digital printing machine 2 is a YC-OPK0418 digital printing machine 2.

As shown in fig. 7 and 8, the drying mechanism 3 includes a housing 31, a conveying mechanism 39 horizontally disposed in the housing 31 for conveying the products to be dried, the conveying mechanism 39 includes two conveying rollers 391 parallel to and rotating with the housing 31, a transmission belt 392 disposed between the conveying rollers 391, and a first driving motor 393 for driving the conveying rollers 391 to rotate, and an output end of the first driving motor 393 is fixedly connected to one of the conveying rollers 391. The transfer roller 391 serves to transfer the product to be dried.

A heat source pipeline 32 is communicated with the shell 31, an inlet 33 and an outlet 34 of a product to be dried are respectively arranged on two sides of the shell 31, a drying pipeline 35 is arranged above the transmission mechanism 39, a plurality of hot air outlets 36 are arranged on the drying pipeline 35, the hot air outlets 36 can be one or more of round holes or polygonal holes, two ends of the drying pipeline 35 are communicated with air inlets 37 for air intake, two air inlets 37 are arranged, the heat source pipeline 32 is positioned at one side of an air inlet of the air inlets 37, the heat source pipeline 32 is one or more of hot water, hot oil and heating wires, air outlets of the two air inlets 37 are respectively communicated with two ends of the drying pipeline 35, an exhaust mechanism 38 is also arranged above the drying pipeline 35, the exhaust mechanism 38 comprises an exhaust pipe 381 arranged above the drying pipeline 35, one end of the exhaust pipe 381 is positioned above the drying pipeline 35, and the. Through the arrangement of the heat source pipeline 32, the air inlet machine 37 and the drying pipeline 35, the printing paper on the conveying device can be quickly dried through mutual matching of the heat source pipeline, the air inlet machine and the drying pipeline, and the drying effect is good; set up exhaust mechanism 38 and can effectively absorb the inside hot vapour of casing 31, thereby avoid hot vapour to meet cold liquefaction and drip on the calico paper and influence the stamp effect.

As shown in fig. 5 and 6, the double-shaft cloth winding mechanism 4 includes a winding frame 41, a plurality of output rollers 42 for conveying a product to be wound are disposed on the winding frame 41, an uninterrupted winding device 43 is disposed at the rear side of the conveying mechanism 39, and the uninterrupted winding device 43 includes a rotating frame 431 rotatably connected to the winding frame 41, two or more winding mechanisms 433 disposed on the rotating frame 431, and a third driving motor 432 for driving the winding mechanisms 433 to rotate.

The winding mechanism 433 comprises second safety chucks 4331 symmetrically arranged between the rotating frames 431 and a double-shaft cloth roller 4332 arranged between the second safety chucks 4331, the double-shaft cloth roller is detachable from the second safety chucks 4331, and the output end of the third driving motor 432 is fixedly connected with the second safety chucks 4331 on one side.

The first safety chuck 131 and the second safety chuck 4331 are W35-30 foot type safety chucks, which are devices capable of being connected rapidly and are applied to a reel for receiving and discharging materials, so that the loading and unloading time of an operator is saved. It is not necessary to move the structure of the machine each time when changing material. The safety chuck provides the function of quickly replacing materials for an operator when receiving and discharging materials. The time for loading and unloading materials is reduced, so that the work of an operator is more efficient, and the cost is saved.

The uninterrupted winding device 43 further comprises a driving mechanism 44 for driving the rotating frame 431 to rotate so as to switch the position of the winding mechanism 433, the driving mechanism 44 comprises a cylinder 441 horizontally and fixedly mounted on the winding frame 41, and a rack 442 fixedly mounted on the output end of the cylinder 441, the central shaft of the rotating frame 431 penetrates through the winding frame 41 and is fixedly mounted with a gear 443, the gear 443 is meshed with teeth on the rack 442, when one winding mechanism 433 on the rotating frame 431 is fully wound, the cylinder 441 is started, the output end of the cylinder 441 extends to drive the rack 442, teeth on the rack 442 are meshed with the gear 443, so as to drive the gear 443 to rotate, the gear 443 drives the rotating frame 431 to rotate 180 degrees, and the winding mechanism 433 on the rotating frame 431 is switched, so that the winding mechanism 433 can be quickly switched after the product is wound, the replacement time is saved, and meanwhile, uninterrupted winding of the product by the device is also realized, the winding efficiency is improved.

The working principle is as follows: a feeding roller with rolled printing paper is installed between the first safety chucks 131 for feeding, the printing paper is conveyed into the digital printing machine 2, in the conveying process, when the position changer 141 in the induction mechanism 14 senses that the tension of the conveyed product to be printed is changed, the tension is fed back to the PLC control box 15, the PLC control box 15 adjusts the rotating speed of the second driving motor 133 to adjust the rotating speed of the feeding mechanism, so that the tension of the product to be printed is detected in real time and automatically adjusted, the tension of the product to be printed is kept at the moment of conveying, the printing quality is improved, the debugging time is reduced, the printing efficiency is improved, and then the digital printing machine 2 prints the printing paper;

after printing is finished, the heat source pipeline 32, the air inlet fan 37 and the exhaust fan 382 are started, printing paper enters the shell 31 from the inlet 33 of the shell 31 and is placed on the conveying belt 392, the conveying belt 392 conveys the printing paper, the heat source pipeline 32 provides a heat source to heat air at the air inlet side of the air inlet fan 37, the air conveyed to the drying pipeline 35 by the air inlet machine 37 is hot air heated by the heat source pipeline 32, the drying efficiency is improved, the hot air is discharged from the hot air outlet 36 to dry the printing paper on the transmission belt 392, and the rotational speed of the first driving motor 393 is controlled such that when the printing paper is transferred to the outlet 34 of the housing 31, the printing paper can be completely dried, the exhaust mechanism 38 can suck the hot steam in the shell 31 into the exhaust pipe 381 and exhaust the hot steam out of the shell 31, and the hot steam is prevented from being liquefied and falling onto the printing paper to influence the printing effect of the printing paper;

finally, the dried printing paper is rolled up, the third driving motor 432 is started, the third driving motor 432 is driven to rotate to drive the second safety chucks 4331 to rotate, so that the double-shaft cloth roller 4332 between the two second safety chucks 4331 is driven, the paper transmitted from the transmission roller 391 is rolled up, when one rolling mechanism 433 on the rotating frame 431 is fully rolled up, the air cylinder 441 is started, the output end of the air cylinder 441 extends to drive the rack 442, teeth on the rack 442 are meshed with the gear 443 to drive the gear 443 to rotate, the gear 443 drives the rotating frame 431 to rotate, the rolling mechanism 433 on the rotating frame 431 is switched, and therefore uninterrupted rolling is achieved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides a novel printing equipment production line, its characterized in that, including feed mechanism (1) that is used for providing the product of waiting to stamp, be used for the printing to wait digital printing machine (2) of the product of stamp, be used for drying mechanism (3) of the product of stamp and biax batching mechanism (4) of rolling stamp product, feed mechanism (1), digital printing machine (2), drying mechanism (3), biax batching mechanism (4) arrange the installation in proper order.

2. The novel printing equipment production line as claimed in claim 1, characterized in that: the drying mechanism (3) comprises a shell (31), a transmission mechanism (39) horizontally arranged in the shell (31) and used for transmitting products to be dried and a heat source pipeline (32) communicated with the shell (31), wherein an inlet (33) and an outlet (34) of the products to be dried are respectively formed in two sides of the shell (31), a drying pipeline (35) is arranged above the transmission mechanism (39), a plurality of hot air outlets (36) and (34) are formed in the drying pipeline (35), air inlet machines (37) used for air inlet are communicated with two ends of the drying pipeline (35), two air inlet machines (37) are arranged, the heat source pipeline (32) is positioned on one side of an air inlet of the air inlet machines (37), air outlets of the two air inlet machines (37) are respectively communicated with two ends of the drying pipeline (35), and an exhaust mechanism (38) is further arranged above the drying pipeline (35), exhaust mechanism (38) including set up exhaust pipe (381) above stoving pipeline (35), exhaust pipe (381) one end be located stoving pipeline (35) top, the other end is equipped with air exhauster (382).

3. A novel printing apparatus production line according to claim 1 or 2, characterized in that: the transmission mechanism (39) comprises two transmission rollers (391) which are parallel to each other and rotate on the shell (31), a transmission belt (392) arranged between the transmission rollers (391) and a first driving motor (393) used for driving the transmission rollers (391) to rotate, wherein the output end of the first driving motor (393) is fixedly connected with one of the transmission rollers (391).

4. A novel printing apparatus production line according to claim 1 or 2, characterized in that: feed mechanism (1) including feed frame (11), be provided with on feed frame (11) and be used for the transmission to treat input roller (12) of printing product, be provided with feed subassembly (13) that are used for providing the scroll on feed frame (11), one side of feed frame (11) is provided with drive feed mechanism pivoted second driving motor (133), one side of feed mechanism still is provided with induction mechanism (14) that are used for real-time detection to treat printing product rate of tension, feed frame (11) one side still is provided with PLC control box (15), PLC control box (15) can be according to induction mechanism (14) feedback signal regulation second driving motor's (133) rotational speed in order to adjust the feed mechanism rotational speed.

5. A novel printing equipment production line according to claim 4, characterized in that: the feeding mechanism comprises first safety chucks (131) symmetrically arranged between the feeding frames (11) and a feeding roller (132) arranged between the first safety chucks (131), the first safety chucks (131) are rotationally connected to the feeding frames (11), the feeding roller (132) can be detached from the first safety chucks (131), and the output end of the second driving motor (133) is fixedly connected with one of the first safety chucks (131).

6. A novel printing equipment production line according to claim 5, characterized in that: sensing mechanism (14) shift ware (141), connecting rod (142) and tensioning roller (143) including symmetry fixed mounting on feed frame (11), connecting rod (142) have two and rotate respectively and connect in the ware (141) that shifts of both sides, tensioning roller (143) rotate between connecting rod (142) and lie in connecting rod (142) and keep away from the one side that shifts ware (141), the ware (141) that shifts be used for the position change of real-time supervision connecting rod (142) and feed back to the PLC controller. Treat the stamp product through tensioning roller (143), when the tension of treating the stamp product changes, can make the position of tensioning roller (143) take place to remove, thereby make connecting rod (142) take place to rotate, make the rate of tension that shifts ware (141) can detect treating the stamp product change and feed back to PLC control box (15), PLC control box (15) can be according to response mechanism (14) feedback signal adjusts the rotational speed of second driving motor (133) in order to adjust feeding mechanism rotational speed, thereby play real-time detection's effect.

7. A novel printing apparatus production line according to claim 1 or 2 or 5 or 6, characterized in that: biax batching mechanism (4) including rolling up frame (41), be provided with a plurality of output roller (42) that are used for the transmission to wait to roll up the product on rolling up frame (41), the rear side of transmission device (39) sets up incessant coiling mechanism (43), incessant coiling mechanism (43) are including rotating turret (431), two and more than setting rolling mechanism (433) on turret (431) and being used for driving rolling mechanism (433) pivoted third driving motor (432) of connecting in rolling up frame (41), incessant coiling mechanism (43) are still including being used for driving turret (431) to rotate actuating mechanism (44) with switching rolling mechanism (433) position. The switching of the winding mechanism (433) is completed through the driving mechanism (44) and the rotating frame (431), so that the winding mechanism (433) can be switched quickly after the product is wound, the replacement time is saved, meanwhile, the continuous winding of the equipment on the product is realized, and the winding efficiency is improved.

8. A novel printing equipment production line according to claim 7, characterized in that: the driving mechanism (44) comprises an air cylinder (441) horizontally and fixedly mounted on the winding frame (41) and a rack (442) fixedly mounted at the output end of the air cylinder (441), the central shaft of the rotating frame (431) penetrates through the winding frame (41) and is fixedly mounted with a gear (443), and the gear (443) is meshed with teeth on the rack (442). When one rolling mechanism (433) on the rotating frame (431) is fully rolled, the air cylinder (441) is started, the output end of the air cylinder (441) extends to drive the rack (442), teeth on the rack (442) are meshed with the gear (443) so as to drive the gear (443) to rotate, the gear (443) drives the rotating frame (431) to rotate 180 degrees, and the rolling mechanism (433) on the rotating frame (431) is switched.

9. The novel printing equipment production line as claimed in claim 8, characterized in that: the winding mechanism (433) include that the symmetry sets up second safety chuck (4331) between rotating turret (431), set up the biax cloth roller between second safety chuck (4331), the biax cloth roller can be dismantled in second safety chuck (4331), the output of third driving motor (432) and second safety chuck (4331) fixed connection of one side wherein. The output end of the third driving motor (432) is fixedly connected with the second safety chuck (4331) on one side, and when the output end of the third driving motor (432) rotates, the second safety chuck (4331) is driven to rotate, so that the double-shaft cloth roller clamped by the second safety chuck (4331) rotates to roll the material.

10. A novel printing equipment method is characterized by comprising the following steps:

s1, feeding: a feeding roller with rolled printing paper is arranged between the first safety chucks (131) for feeding, the paper to be printed is transmitted into the digital printing machine (2), and in the transmission process, the sensing mechanism (14) senses the tension of the paper to be printed in real time and automatically adjusts the transmission speed;

s2, printing: the digital printing machine (2) prints the transmitted paper;

s3, drying: the drying mechanism (3) dries the printed paper;

s4, rolling: the printing paper after being dried is rolled up by the rolling mechanism, when one rolling mechanism (433) on the rotating frame (431) is fully rolled up, the air cylinder (441) is started, the output end of the air cylinder (441) extends to drive the rack (442), teeth on the rack (442) are meshed with the gear (443) to drive the gear (443) to rotate, the gear (443) drives the rotating frame (431) to rotate 180 degrees, the rolling mechanism (433) on the rotating frame (431) is switched, and the printing paper is rolled up uninterruptedly.