CN211195341U - Printing device and printing machine - Google Patents

Abstract

The utility model discloses a printing device and printing machine. Aim at provides a printing device, when using with packagine machine is supporting, the printing type version page of a whole page that prints on the cylinder need not to move with packagine machine drag chain synchronous synteny speed. The scheme is as follows: the printing device comprises a paper winding roller group for bearing and guiding paper to advance and a printing mechanism which is matched with the paper winding roller group and is used for printing the paper borne on the paper winding roller group; the printing apparatus further includes: the paper traction mechanism is arranged at the output end of the printing mechanism and used for drawing the paper to advance; and the paper caching mechanism is arranged at the output end of the paper traction mechanism and is used for temporarily storing the printed paper output by the paper traction mechanism in the paper caching mechanism. The utility model discloses mainly be applied to printing and packing trade.

Description

Printing device and printing machine

Technical Field

The utility model belongs to the technical field of the printing machine technique and specifically relates to a printing device and contain printing machine of this printing device.

Background

The printing machine is widely applied to the industries of food, beverage, tobacco, medicine, health care products and cosmetics, and is particularly applied to the printing of flexible packaging materials and paper container packaging.

At present, the existing on-line printing machine matched with the packaging machine has a structure as shown in fig. 5: a printing cylinder 101 with a printing forme, an inking screen roller 102, an ink scraper 103, an ink tank 104, a paper 105 and a printing roller 106. The working principle is that the inking graining roller 102 brings the ink in the ink pool 104, and the inking graining roller 102 is even in the surface ink layer before contacting with the printing cylinder 101 with printing plate by the ink scraper 103. When the packaging machine is stopped, the inking cylinder 102 is brought into contact with the printing cylinder 101 with the printing plate and is rolled over, so that the ink is evenly transferred to the surface of the printing plate, and after the inking is completed, the inking cylinder 102 is disengaged from the printing cylinder 101 with the printing plate, and the printing roller 106 carries the paper against the printing cylinder 101 with the printing plate. When the packing machine chain moves and pulls the paper 105 to move, the moving linear speed of the printing surface of the printing cylinder 101 with the printing plate is consistent with the moving speed of the packing machine chain (moving of the paper 105), namely, the paper 105 and the printing plate roll oppositely, and the printing is completed.

Printing by the printing machine when the chain of the packaging machine moves can be realized only on the premise that the chain of the packaging machine and the printing roller 101 synchronously move and the moving speed of the chain of the packaging machine is consistent with the moving linear speed of the printing plate layout, and the application range is small.

Disclosure of Invention

An object of the utility model is to overcome the problem that above-mentioned exists, provide a printing device, when using with packagine machine is supporting, the printing type version space of a whole page on the printing cylinder need not to pull the synchronous collinear speed of chain and remove with packagine machine.

Another object of the present invention is to provide a printing machine which operates independently.

The purpose of the utility model is achieved by the following technical proposal,

a printing device comprises a paper winding roller group for bearing and guiding paper to advance, and a printing mechanism which is matched with the paper winding roller group and is used for printing the paper borne on the paper winding roller group; the printing apparatus further includes:

the paper traction mechanism is arranged at the output end of the printing mechanism and used for drawing the paper to advance;

and the paper caching mechanism is arranged at the output end of the paper traction mechanism and is used for temporarily storing the printed paper output by the paper traction mechanism in the paper caching mechanism.

In the prior art, because the inertia effect of the printing cylinder that has the printing type version of major diameter, unable quick response (start), simultaneously because need guarantee that packagine machine chain (or winding mechanism) translation rate is unanimous with printing type version space translation linear velocity, consequently packagine machine chain (or winding mechanism) translation rate need follow the linear velocity of printing cylinder, leads to packagine machine chain (or winding mechanism) speed to be controlled to influence packagine machine (or winding mechanism) functioning speed and efficiency. The utility model discloses utilize paper buffer memory mechanism to keep in inside with the printed paper of paper drive mechanism output, reserve the paper of keeping in of sufficient length (having accomplished the printing) for the removal of packagine machine chain (or winding mechanism), even be greater than printing type version space of a whole page moving line speed at packagine machine chain (or winding mechanism) translation rate, perhaps when packagine machine chain (or winding mechanism) start-up time is earlier than printing cylinder start-up time, also can normally work, improve packagine machine (or winding mechanism) functioning speed and efficiency. Namely, the printing plate surface on the printing roller does not need to move at the same linear speed with the traction chain (or the winding mechanism) of the packaging machine, thereby greatly improving the application range of the printing plate surface.

Preferably, the paper caching mechanism comprises a caching fixed roller and a caching floating roller which is born on the paper between the paper traction mechanism and the caching fixed roller and moves between a first position and a second position; when the paper traction mechanism pulls the paper to advance, the buffer floating roller moves downwards under the action of the gravity of the buffer floating roller and moves from the first position to the second position, and the paper buffer mechanism temporarily stores the printed paper output by the paper traction mechanism in the buffer floating roller and keeps the tension of the paper in the paper buffer mechanism constant; when the buffer floating roller moves from the second position to the first position (overcoming the gravity action of the buffer floating roller), the paper buffer mechanism releases the printed paper temporarily stored in the paper buffer mechanism from the paper outlet end of the paper buffer mechanism under the action of external force (from equipment such as a chain of a packing machine or a rolling mechanism of a printing machine).

Preferably, the paper buffer mechanism further comprises an upper limit switch and a lower limit switch which are matched with the buffer floating roller. The maximum length of the paper temporarily stored in the paper buffer mechanism is twice of the linear distance between the upper limit switch and the lower limit switch, and is also the maximum distance of one step length of the paper pulled by the paper pulling mechanism.

Preferably, the paper traction mechanism comprises an active roller (driven by a motor) and a passive roller which are parallel to each other and are arranged (tangent) closely, and the paper passes through between the active roller and the passive roller and runs under the action of the pair of rollers of the active roller and the passive roller; that is, the paper is tightly attached to the circumferential surface of the driving roller under the action of the driven roller, and the friction force between the paper and the driving roller is utilized to drive the paper to advance.

Preferably, the printing mechanism comprises a printing cylinder, an inking mechanism and a printing roller which are respectively matched with the printing cylinder; the inking mechanism and the printing roller are respectively positioned at two sides of the printing cylinder and can move relative to the printing cylinder.

The printing roller can move relative to the printing roller and is specifically realized by a printing roller rocker arm which is rotatably arranged on a frame of the printing device, the printing roller is rotatably arranged at one end of the printing roller rocker arm, and the other end of the printing roller rocker arm is connected with a rocker arm driving cylinder for driving the printing roller rocker arm to act so as to realize the movement of the printing roller relative to the printing roller.

Preferably, two adjustable limits are respectively arranged on two sides of the end part of the rocker arm of the printing roller and used for controlling the swinging amplitude of the rocker arm of the printing roller, so that paper on the printing roller is tightly attached to the printing roller in the printing process. The adjustable limit comprises a base with a threaded hole and a screw in threaded connection with the base, and the swingable amplitude of the printing roller rocker arm is adjusted through adjusting the screw.

Preferably, the inking mechanism includes an ink tank swing arm rotatably mounted on the printing device frame, an ink tank located on the ink tank swing arm, an ink scraping plate disposed on the ink tank, an anilox roller located in the ink tank, a cylinder rotatably connected to one end of the ink tank swing arm (far away from one end of the ink tank), and an adjustable limiting part located at one end of the ink tank swing arm (far away from one end of the ink tank) and used for realizing the swing limiting of the ink tank swing arm (the structure of the adjustable limiting part is the same as that of the adjustable limiting structure, and the description is omitted here). The anilox roller is driven by a motor to rotate, ink in an ink pool is brought up, ink on the surface of the anilox roller is scraped by an ink scraper, and quantitative ink is stored in an anilox groove of the anilox roller. When inking is needed, the air cylinder drives the ink pool swing arm to swing, and the adjustable limiting piece is used for positioning, so that the anilox roller of the ink pool is abutted against the printing roller and moves oppositely to the printing roller to realize inking; after inking, the cylinder drives the ink pool swing arm to swing in the opposite direction, so that the anilox roller is separated from the printing cylinder.

Preferably, the speed of the paper traction mechanism for drawing the paper to move is consistent with the linear speed of the printing plate layout on the printing cylinder. And when the paper moves, the printing roller and the printing roller are rolled in pair to realize printing.

Preferably, the printing device is matched with the packaging machine, the paper positioned at the paper feeding end of the printing device is connected with a paper constant-tension uncoiling mechanism of the packaging machine, and the paper at the paper discharging end is pulled by a chain to move after being sealed with a plastic film on the packaging machine. The distance of one step length of the chain of the packaging machine is equal to the distance of one step length of the paper traction mechanism for drawing the paper, and the length of the chain of the packaging machine is equal to the length of the paper discharged by the constant-tension unwinding mechanism of the packaging machine.

A printing machine comprises an unwinding mechanism, the printing device and a winding mechanism which are sequentially arranged along the advancing direction of paper; and the paper output by the unwinding mechanism is printed by the printing device and then output to the winding mechanism, so that the printing machine which operates independently is formed.

Preferably, the unwinding mechanism comprises an unwinding shaft, a first unwinding fixed roller, an unwinding floating roller and a second unwinding fixed roller which are sequentially arranged along the paper advancing direction; the unreeling floating roller is borne on the paper between the first unreeling fixed roller and the second unreeling fixed roller and moves between a third position and a fourth position. The paper between the paper feeding end and the paper traction mechanism is always kept in a constant tension state under the action of gravity of the unreeling floating roller. The third position and the fourth position are respectively provided with an unreeling upper limit switch and an unreeling lower limit switch which are matched with the unreeling floating rolling shaft; after the unreeling floating roller moves to a third position to touch the unreeling upper limit switch, the unreeling shaft starts unreeling; and after the unreeling floating roller moves to a fourth position and touches the unreeling lower limit switch, the unreeling shaft stops unreeling.

Compared with the prior art, the utility model have following advantage and effect:

1. the utility model discloses utilize paper buffer memory mechanism to keep in inside with the printed paper of paper drive mechanism output, reserve the paper of keeping in of sufficient length (having accomplished the printing) for the removal of packagine machine chain (or winding mechanism), even be greater than printing type version space of a whole page moving line speed at packagine machine chain (or winding mechanism) translation rate, perhaps when packagine machine chain (or winding mechanism) start-up time is earlier than printing cylinder start-up time, also can normally work, improve packagine machine (or winding mechanism) functioning speed and efficiency. Namely, the printing plate surface on the printing cylinder does not need to move at the same linear speed with the traction chain (or the winding mechanism) of the packaging machine, and the application range is greatly improved compared with the prior art.

2. The paper in the paper buffer mechanism is always kept in a constant tension state, the register precision is high, and the printing quality is improved.

3. The automatic printing device can realize online synchronous printing by being matched with a packaging machine, paper does not need to move at the same linear speed with a traction chain of the packaging machine in a synchronous mode during printing, and independent electrical control is achieved, so that the technical problem that in the prior art, in order to guarantee the consistency of the chain moving speed of the packaging machine and the moving linear speed of a printing character surface, the control of servo motors driven by the servo motors respectively needs to be related to the packaging machine, and the printing device cannot be applied to other occasions as an independent product is solved.

4. The paper threading is simple, the paper threading distance is short, the paper moves stably during printing, and the tension change is small.

5. The printing machine capable of running independently is formed by matching the unwinding mechanism and the winding mechanism, and the inking process and the printing process are independent from each other and the uniqueness of the gap working principle of the printing machine enables the printing layout length to be changed without changing the diameter of a printing roller and the transmission ratio of a paper traction device, so that the printing machine is particularly suitable for small-batch printing of different layouts.

Drawings

Fig. 1 is a schematic structural view of the printing apparatus of the present invention.

Fig. 2 is a schematic structural diagram of the inking mechanism of the present invention.

FIG. 3 is a schematic view of the swing structure of the printing roller of the present invention.

Fig. 4 is a schematic structural diagram of the printing machine of the present invention operating independently.

Fig. 5 is a schematic structural diagram of the prior art of the present invention.

Detailed Description

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

As shown in fig. 1, the printing apparatus of the present invention includes:

the paper winding roller group is used for bearing and guiding paper 3 to advance and consists of a plurality of paper winding rollers 2 which are sequentially arranged along the paper advancing direction;

a printing mechanism which is matched with the paper winding roller group and prints the paper 3 loaded on the paper winding roller group;

the paper traction mechanism 6 is arranged at the output end of the printing mechanism and is used for drawing the paper 3 to advance;

and a paper buffer mechanism 7 provided at the output end of the paper pulling mechanism 6 and temporarily storing the paper 3 output from the paper pulling mechanism 6.

The printing mechanism comprises a printing roller 1 with a printing matrix on the surface, and an inking mechanism 4 and a printing roller 5 which are respectively matched with the printing roller 1; the inking mechanism 4 and the printing roller 5 are respectively positioned on two sides of the printing cylinder 1 and can move relative to the printing cylinder 1.

As shown in fig. 2, the inking mechanism 4 includes an ink tank swing arm 4-1 rotatably mounted on the printing apparatus frame, an ink tank 4-2 located on the ink tank swing arm 4-1, an ink scraper 4-3 disposed on the ink tank 4-2, an anilox roller 4-4 located in the ink tank 4-2, a cylinder 4-5 rotatably connected to one end (far end) of the ink tank swing arm 4-1, and an adjustable limiting member 4-6 (the structure of which is the same as the adjustable limiting structure described below and will not be described herein again) located at one end (far end) of the ink tank swing arm 4-1 and used for realizing the swing limiting of the ink tank swing arm 4-1. The anilox roller 4-4 is driven by a motor to rotate, ink in the ink pool 4-2 is brought up, ink on the surface of the anilox roller 4-4 is scraped off by the ink scraper 4-3, and a certain amount of ink is stored in an anilox groove of the anilox roller 4-4. When inking is needed, the air cylinder 4-5 drives the ink pool swing arm 4-1 to swing, and the adjustable limiting piece 4-6 is used for positioning, so that the anilox roller 4-4 abuts against the printing cylinder 1 and performs opposite rolling movement to realize inking; after inking, the cylinder 4-5 drives the ink pool swing arm 4-1 to swing in the opposite direction, so that the anilox roller 4-4 is separated from the printing cylinder 1.

As shown in fig. 3, the printing roller 5 is movable relative to the printing cylinder 1, and is implemented by a printing roller swing arm 10 rotatably mounted on the frame of the printing device, the printing roller 5 is rotatably mounted at one end of the printing roller swing arm 10, and the other end of the printing roller swing arm is rotatably connected to a swing arm driving cylinder 11 for driving the printing roller swing arm 10 to move so as to implement the movement of the printing roller 5 relative to the printing cylinder 1. Two adjustable limit positions 12 are respectively arranged on two sides of the end part (the end far away from the printing roller) of the rocker arm 10 of the printing roller and are used for controlling the swing amplitude of the rocker arm 10 of the printing roller so that paper on the printing roller 5 is tightly attached to the printing roller 1 in the printing process. The adjustable limit 12 comprises a base 12-1 with a threaded hole and a screw 12-2 which is connected with the base 12-1 in a threaded mode, and the swingable amplitude of the printing roller rocker arm 10 is adjusted through adjusting the screw 12-2.

The paper traction mechanism 6 comprises an active roller 6-1 and a passive roller 6-2 which are parallel to each other and are arranged closely, and the paper 3 passes through between the active roller 6-1 and the passive roller 6-2 and advances under the rolling action of the active roller 6-1 and the passive roller 6-2; namely, the paper 3 is tightly attached to the circumferential surface of the driving roller 6-1 under the action of the driven roller 6-2, and the paper 3 is driven to advance by utilizing the friction force between the paper 3 and the driving roller 6-1. The driving roller 6-1 is driven by a motor, and the traction paper 3 moves along the paper feeding line shown in the figure 1 according to a set length by virtue of the paper winding roller group; when the device is matched with a packaging machine to work, the set length is the moving step length of the packaging machine; when the printer works as an independent printing machine, the set length is the printing layout length.

During printing, the speed of the paper traction mechanism 6 for drawing the paper 3 to move is consistent with the linear speed of the printing plate layout on the printing roller 1. While the paper moves, the printing roller 5 and the printing roller 1 roll in pairs to realize printing.

The paper caching mechanism 7 comprises a caching fixed roller 7-1 and a caching floating roller 7-2 which is born on the paper 3 between the paper traction mechanism 6 and the caching fixed roller 7-1 and moves between a first position and a second position; when the paper traction mechanism 6 pulls the paper 3 to advance, the buffer floating roller 7-2 moves downwards under the action of the gravity of the buffer floating roller and moves from the first position to the second position, the paper buffer mechanism 7 temporarily stores the printed paper 3 output by the paper traction mechanism 6 in the paper buffer mechanism 7, and the gravity of the buffer floating roller 7-2 is utilized to keep the tension of the paper 3 in the paper buffer mechanism 7 constant; when the buffer floating roller 7-2 moves from the second position to the first position (the buffer floating roller moves upwards under the action of the paper and overcomes the action of gravity), the paper buffer mechanism 7 releases the printed paper 3 temporarily stored in the paper buffer mechanism from the paper outlet end of the paper buffer mechanism under the action of external force (from equipment such as a chain of a packing machine or a rolling mechanism of a printing machine).

The paper caching mechanism 7 further comprises an upper limit switch 7-3 and a lower limit switch 7-4 which are matched with the caching floating roller 7-2. When the printing machine is matched with a packaging machine to work, the printing machine is used for alarming the maximum printing length. The maximum length of the paper temporarily stored in the paper buffer mechanism 7 is twice of the linear distance between the upper limit switch 7-3 and the lower limit switch 7-4, and is also the maximum distance of one step length of paper movement pulled by the paper traction mechanism 6.

In this embodiment, when the printing device is used with the packaging machine in a matching manner, the paper at the paper feeding end of the printing device is connected with the paper constant tension uncoiling mechanism of the packaging machine, and the paper at the paper discharging end is drawn by the chain to move after being sealed with the plastic film on the packaging machine. The distance of one step length of the chain of the packaging machine is equal to the distance of one step length of the paper 3 pulled by the paper pulling mechanism 6, and the length of the paper fed by the constant-tension unreeling mechanism of the packaging machine is equal to the length of the paper fed by the constant-tension unreeling mechanism of the packaging machine. The printing method comprises the following steps: the paper 3 is fed by the paper winding roller group in a mode shown in figure 1, the paper feeding end paper 3 is connected with a paper constant tension uncoiling mechanism of a packing machine, the paper discharging end paper and a plastic film clamped on a chain of the packing machine are sealed together by a heat sealing device, and the chain pulls the paper 3 to move while moving. The chain of the packing machine pulls the paper 3 to move forward by one step length, and simultaneously drives the buffer floating roller 7-2 in the paper buffer mechanism 7 to move upwards, so that the paper is moved out of the paper buffer mechanism 7. When the chain of the packing machine stops, the paper traction mechanism 6 pulls the paper to move, at the moment, the printing roller 5 carries the paper 3 and abuts against the printing roller 1, the printing roller 1 rotates simultaneously, the moving speed of the paper 3 is consistent with the moving linear speed of the printing plate layout of the roller of the printing roller 1, namely, the paper 3 and the printing roller move one step length in opposite rolling mode, and printing is finished. The paper pulling mechanism 6 simultaneously feeds out the printed paper 3, and the paper is stored in the paper buffer mechanism 7 by the paper buffer mechanism 7 through downward movement of the buffer floating roller 7-2, and the tension of the paper is kept constant. After printing, the printing roller 5 is separated from the printing cylinder 1, the inking screen roller 4-4 is close to the printing cylinder 1 and is in contact with the printing cylinder 1 with the printing plate to roll, ink is evenly transferred to the surface of the printing plate, after inking, the inking screen roller 4-4 is separated from the printing cylinder 1, and the printing roller 5 carries paper close to the printing cylinder 1 to be printed. The chain of the packaging machine moves to pull the printed paper 3 to move out of the paper buffer mechanism 7 again. With the circulation, the online printing of the packaging machine is realized.

As shown in fig. 4, the printing apparatus of this embodiment may also be matched with the unwinding mechanism 8 and the winding mechanism 9 to form a printer which operates independently, and includes the unwinding mechanism 8, the printing apparatus, and the winding mechanism 9, which are sequentially arranged along the paper advancing direction; and the paper 3 output by the unwinding mechanism 8 is printed by the printing device and then output to the winding mechanism 9.

The unreeling mechanism 8 comprises an unreeling shaft 8-1, a first unreeling fixed roller 8-2, an unreeling floating roller 8-3 and a second unreeling fixed roller 8-4 which are sequentially arranged along the advancing direction of the paper 3; the unreeling floating roller 8-3 is borne on the paper 3 between the first unreeling fixed roller 8-2 and the second unreeling fixed roller 8-4 and moves between a third position and a fourth position. The third position and the fourth position are respectively provided with an unreeling upper limit switch 8-5 and an unreeling lower limit switch 8-6 which are matched with the unreeling floating roller 8-3; the unreeling upper limit switch 8-5 controls an unreeling driving motor (connected with the unreeling shaft and used for controlling the unreeling shaft to work) to be turned on (unreeled), and the unreeling lower limit switch 8-6 controls the unreeling driving motor to be stopped; the method specifically comprises the following steps: after the unreeling floating roller 8-3 moves to a third position to touch the unreeling upper limit switch 8-5, the unreeling shaft 8-1 starts unreeling; after the unreeling floating roller 8-3 moves to the fourth position to touch the unreeling lower limit switch 8-6, the unreeling shaft 8-1 stops unreeling. By utilizing the gravity action of the unreeling floating roller 8-3, paper between the paper feeding end and the paper traction mechanism 6 is always kept in a constant tension state, the register precision is ensured, and the printing quality is improved.

The winding mechanism 9 comprises a winding driving motor and a winding shaft. When the buffer floating roller 7-2 moves to the lower limit switch 7-4 and is triggered, the winding driving motor is controlled to be started (wound); when the buffer floating roller 7-2 moves to the upper limit switch 7-3 and triggers the upper limit switch, the winding driving motor is controlled to stop.

The printing method of the printing machine comprises the following specific steps: the sheet 3 is fed by the sheet winding roller group in the manner shown in fig. 4. Before printing, an unreeling floating roller 8-3 in the unreeling mechanism 8 is positioned below, a printing roller 5 carries paper to be printed and is tensioned against the printing roller 1, an inking screen roller 4-4 is separated from the printing roller 1, and a caching floating roller 7-2 in the paper caching mechanism 7 is positioned above. When printing starts, the paper traction mechanism 6 and the printing cylinder 1 are started and stopped simultaneously, the speed of the paper traction mechanism 6 for drawing the paper 3 to move is consistent with the linear speed of the printing plate surface of the printing cylinder 1, and the opposite rolling motion of the printing plate surface and the paper is ensured. The distance that the paper traction mechanism 6 pulls the paper 3 to move is the length of the printing layout. When the paper traction mechanism 6 is used for dragging the paper to print, the unreeling floating roller 8-3 in the unreeling mechanism 8 moves upwards, and the caching floating roller 7-2 in the paper caching mechanism 7 moves downwards. When printing stops, the unreeling floating roller 8-3 is located at the third position and touches the unreeling upper limit switch 8-5, the caching floating roller 7-2 is located at the second position and touches the lower limit switch 7-4, the unreeling shaft driving motor and the reeling shaft driving motor are respectively controlled to be started to unreel and reel until the unreeling floating roller 8-3 moves downwards to the fourth position and touches the unreeling lower limit switch 8-6, the unreeling shaft driving motor is controlled to stop (unreel is stopped), the caching floating roller 7-2 moves upwards to the first position and touches the upper limit switch 7-3, and the reeling shaft driving motor is controlled to stop (reel is stopped). When the printing is stopped, the printing roller 5 is separated from the printing cylinder 1, the inking screen roller 4-4 is close to the printing cylinder 1 and contacts the counter roller on the surface of the printing plate, the ink is evenly transferred to the surface of the printing plate, after the inking, the inking screen roller 4-4 is separated from the printing cylinder 1, and the printing roller 5 carries the paper to be printed and is close to the printing cylinder 1. After the steps are completed, the printing starts to be the same as the above, and the independent printing function is realized repeatedly in a circulating way.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art, and any changes which are equivalent or similar to the present invention are intended to be covered by the scope of the claims of the present invention.

Claims (10)

1. A printing device comprises a paper winding roller group for bearing and guiding paper (3) to travel, and a printing mechanism which is matched with the paper winding roller group and is used for printing the paper (3) borne on the paper winding roller group; characterized in that, the printing device still includes:

the paper traction mechanism (6) is arranged at the output end of the printing mechanism and is used for drawing the paper (3) to advance;

and the paper caching mechanism (7) is arranged at the output end of the paper traction mechanism (6) and is used for temporarily storing the paper (3) output by the paper traction mechanism (6) in the paper caching mechanism.

2. A printing device according to claim 1, wherein: the paper caching mechanism (7) comprises a caching fixed roller (7-1) and a caching floating roller (7-2) which is born on the paper (3) between the paper traction mechanism (6) and the caching fixed roller (7-1) and moves between a first position and a second position; when the buffer floating roller (7-2) moves from the first position to the second position, the paper buffer mechanism (7) temporarily stores the printed paper (3) output by the paper traction mechanism (6) in the paper buffer mechanism (7), and keeps the tension of the paper (3) in the paper buffer mechanism (7) constant; when the buffer floating roller (7-2) moves from the second position to the first position, the paper buffer mechanism (7) releases the printed paper (3) temporarily stored in the paper buffer mechanism from the paper outlet end of the paper buffer mechanism under the action of external force.

3. A printing device according to claim 2, wherein: the paper caching mechanism (7) further comprises an upper limit switch (7-3) and a lower limit switch (7-4) which are matched with the caching floating roller (7-2).

4. A printing device according to claim 3, wherein: the maximum length of the paper temporarily stored in the paper buffer mechanism (7) is twice of the linear distance between the upper limit switch (7-3) and the lower limit switch (7-4), and is the maximum distance of one step length of the paper pulled by the paper pulling mechanism (6).

5. A printing device according to claim 1, wherein: the paper traction mechanism (6) comprises an active roller (6-1) and a passive roller (6-2) which are parallel to each other and are arranged in an abutting mode, and the paper (3) passes through the space between the active roller (6-1) and the passive roller (6-2) and runs under the action of the two rollers in a rolling mode.

6. A printing device according to claim 1, wherein: the printing mechanism comprises a printing roller (1), and an inking mechanism (4) and a printing roller (5) which are respectively matched with the printing roller (1); the inking mechanism (4) and the printing roller (5) are respectively positioned at two sides of the printing cylinder (1) and can move relative to the printing cylinder (1).

7. A printing device as claimed in claim 6, wherein: the inking mechanism (4) comprises an ink pool swing arm (4-1) rotatably arranged on a printing device frame, an ink pool (4-2) positioned on the ink pool swing arm, an ink scraper (4-3) arranged on the ink pool, a anilox roller (4-4) positioned in the ink pool, an air cylinder (4-5) rotatably connected to one end of the ink pool swing arm (4-1), and an adjustable limiting part (4-6) positioned at one end of the ink pool swing arm (4-1) and used for realizing the swing limiting of the ink pool swing arm;

the moving speed of the paper (3) is consistent with the linear speed of the printing plate layout on the printing roller (1).

8. A printing device according to claim 1, wherein: the printing device is matched with the packaging machine, paper positioned at the paper feeding end of the printing device is connected with a paper constant-tension uncoiling mechanism of the packaging machine, and the paper at the paper discharging end is drawn by a chain to move after being sealed with a plastic film on the packaging machine.

9. A printing press characterized by: it comprises an unwinding mechanism (8), a printing device and a winding mechanism (9) according to any one of claims 1 to 7, which are arranged in sequence along the paper advancing direction; and the paper (3) output by the unwinding mechanism (8) is printed by the printing device and then output to the winding mechanism (9).

10. A printing press according to claim 9, wherein: the unreeling mechanism (8) comprises an unreeling shaft (8-1), a first unreeling fixed roller (8-2), an unreeling floating roller (8-3) and a second unreeling fixed roller (8-4) which are sequentially arranged along the advancing direction of the paper (3); the unreeling floating roller (8-3) is borne on the paper (3) between the first unreeling fixed roller (8-2) and the second unreeling fixed roller (8-4) and moves between a third position and a fourth position; the third position and the fourth position are respectively provided with an unreeling upper limit switch (8-5) and an unreeling lower limit switch (8-6) which are matched with the unreeling floating roller (8-3); after the unreeling floating roller (8-3) moves to a third position to touch the unreeling upper limit switch (8-5), the unreeling shaft (8-1) starts unreeling; after the unreeling floating roller (8-3) moves to the fourth position to touch the unreeling lower limit switch (8-6), the unreeling shaft (8-1) stops unreeling.

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