card printer

Abstract

A card printer with high printing accuracy, uniform card feed speed, and suitability for printing thicker cards. The printer comprises a front-stage pressure roller assembly disposed in front of a printhead assembly, or comprises a front-stage pressure roller assembly and a rear-stage pressure roller assembly disposed behind the printhead assembly. The front-stage pressure roller assembly comprises a front-stage pressure roller and a front-stage drive roller mounted within the printer, stacked one above the other. The rear-stage pressure roller assembly comprises a rear-stage pressure roller and a rear-stage drive roller mounted within the printer, stacked one above the other. The front-stage pressure roller is vertically raised relative to the front-stage drive roller by an automatically height-adjusting front-stage height adjustment assembly when a card approaches the front-stage pressure roller and before the front end of the card contacts the front-stage pressure roller and / or when the rear end of the card is about to break free from the pressure of the front-stage pressure roller. The printer is suitable for printing thicker cards, exhibits a uniform feed speed, prevents printed lines from shifting ahead of the printed content, and improves printing accuracy.

Description

[0001] This application is a divisional application of the patent application with the application date of March 7, 2022, application number 202210216051.2, and invention name “Card Printer”. Technical Field

[0002] The present invention relates to a thermal transfer printer, in particular to a card printer capable of ensuring that a printing medium is transmitted at a uniform speed. Background Art

[0003] The card conveying channel of the card printer includes the following parts in sequence from the entrance of the cards to be printed (hereinafter referred to as blank cards) to the exit of the cards with printed content (hereinafter referred to as loaded cards): card magazine, width limit adjustment assembly, front-stage pressure roller assembly, card position detection device, print head assembly and rear-stage pressure roller assembly (the direction of the blank card entrance is the front, and the direction of the loaded card exit is the rear, the same below).

[0004] The card hopper is a chamber used to place blank cards. Usually, before printing, several blank cards of the same type are stacked in the card hopper. A card drive roller assembly is also provided in the card hopper area to push the blank cards out of the card hopper.

[0005] The width limiting adjustment component is set on both sides of the card compartment and extends backward. It can be adaptively adjusted according to the width of the card and can correct the deviation of the moving card.

[0006] The front-stage pressure roller assembly is arranged in front of the print head assembly. It consists of a front-stage pressure roller and a front-stage drive roller arranged above and below. The front-stage pressure roller presses the blank card moving underneath it against the front-stage drive roller to increase the friction between the card and the front-stage drive roller, thereby effectively preventing the front-stage drive roller from slipping when rolling the blank card to move.

[0007] The card position detection device is usually installed between the front-stage pressure roller assembly and the print head assembly. It mainly includes a position sensor, whose function is to transmit the position information of the blank card moved under it to the main control circuit of the printer. The main control circuit calculates the start time of printing the card based on the set card movement speed and the distance between the sensor and the print head.

[0008] The print head assembly includes a print head arranged on a print support and a print drive roller arranged on a conveying channel frame. When printing, the print head moves downward and presses a blank card against the print drive roller, and the print drive roller rolls the card forward at a set speed.

[0009] The rear-stage pressure roller assembly has basically the same structure as the front-stage pressure roller assembly. It is arranged behind the print head assembly and includes a rear-stage pressure roller and a rear-stage drive roller arranged upper and lower. The rear-stage pressure roller will press the loaded card moving underneath it against the rear-stage drive roller to increase the friction between the card and the rear-stage drive roller, thereby allowing the loaded card to move backward smoothly and at a uniform speed.

[0010] Usually, the distance between the front-stage drive roller and the print drive roller, and the distance between the print drive roller and the rear-stage drive roller are slightly smaller than the length of a single card. In this way, when the card moves, there will always be a place on the card that rests on one of the three drive rollers: the front-stage drive roller, the print drive roller, and the rear-stage drive roller. As a result, the card will always be subject to the driving force that makes it move during the movement.

[0011] In the prior art, the front-stage pressure roller and the rear-stage pressure roller in the front-stage pressure roller assembly and the rear-stage pressure roller assembly are cylindrical hollow sleeves, which can rotate freely. A tension spring is provided on the hollow sleeve. When there is no card between the hollow sleeve and the driving roller below, the hollow sleeve contacts and presses on the driving roller under the action of the tension spring. When the front end of the moving card reaches the hollow sleeve, the card pushes the hollow sleeve up under the push of the driving roller provided in front of the front-stage pressure roller assembly and passes through between the hollow sleeve and the driving roller under the rolling of the driving roller below the hollow sleeve.

[0012] Similar to the front-stage pressure roller assembly and the rear-stage pressure roller assembly, in the prior art, the distance between the print head and the print drive roller in the print head assembly is also adjusted by a tension spring, that is, the print head is connected to a tension spring. Under normal circumstances, the tension spring applies a downward force to the print head. When there is no card between the print head and the print drive roller, the print head touches and presses on the print drive roller. Similarly, when the front end of the moving card is about to touch the print head, the card is squeezed between the print head and the print drive roller based on the thrust generated by the front-stage drive roller. In other words, the print head is lifted up by the card at this time.

[0013] The hollow sleeve in the above structure is normally pressed downward by the tension of the tension spring. Only when the card moving underneath is driven by the driving force will the hollow sleeve be pushed upward by the card. This situation has the following disadvantages:

[0014] 1) When the front end of a card traveling at a set speed touches the hollow sleeve, the card will encounter a resistance and produce a short pause, causing the card to be unable to move stably and uniformly in the card conveying channel.

[0015] In this case, if the tail area on the card is being printed under the print head, the instantaneous jumping movement will greatly affect the printing quality, that is, it will cause the printed line content to be offset and misaligned ahead of the position (this situation applies to the process of the card passing under the print head and moving towards the rear-stage pressure roller assembly).

[0016] 2) When the tail edge of the card passing between the hollow sleeve and the drive roller at a set speed passes over the vertical plane of the hollow sleeve's upper axis, the hollow sleeve will quickly push the card backward under the action of the tension of the tension spring, causing the card to jump backward instantly. This will also cause the card to be unable to move stably and uniformly in the card conveying channel.

[0017] In this case, if the header area on the card is being printed under the print head, the instantaneous jumping movement will greatly affect the printing quality, that is, it will cause the printed line content to be offset and misaligned (this situation applies to the process of the card passing from under the front-stage pressure roller assembly to the print head assembly).

[0018] Likewise, when the front end of a card traveling at a set speed touches the print head, the card will be subjected to a resistance and pause for a short time, which will cause an error in the printing time.

[0019] 4) When the card is thicker, the above structure will not be able to adapt. The reason is that the front end of the card abuts the hollow sleeve or print head at a higher position, and the resistance encountered is also greater. Relying solely on the driving force of the card to push the card to lift the hollow sleeve or print head requires a large force. Under the conditions of small size and limited motor driving force, the structure in the prior art is not suitable for printing on thicker cards. Summary of the Invention

[0020] The technical problem to be solved by the present invention is to provide a card printer with high printing accuracy, uniform card feeding speed and suitable for printing thicker cards.

[0021] In order to solve the above technical problems, the following technical solutions are adopted:

[0022] A card printer includes a front-stage pressure roller assembly arranged on the front side of a print head assembly for rolling a card to move forward. The front-stage pressure roller assembly is composed of a front-stage pressure roller and a front-stage drive roller installed in the printer in an up-down stacked manner. The front-stage pressure roller is raised vertically by a set distance relative to the front-stage drive roller through a front-stage height adjustment assembly that automatically adjusts the height when the card moves near the front-stage pressure roller and before the front end of the card touches the front-stage pressure roller and / or when the rear end of the card is about to break away from the two position nodes where the front-stage pressure roller presses against it.

[0023] The print head in the print head assembly is raised vertically by a set distance relative to the print drive roller when the card line comes near the print head and before the front end of the card touches the print head through a print height adjustment assembly that automatically adjusts the height.

[0024] A rear-stage pressure roller assembly for rolling the card to move forward is provided on the rear side of the print head assembly. The rear-stage pressure roller assembly is composed of a rear-stage pressure roller and a rear-stage drive roller installed in the printer in an up-down stacked manner. The rear-stage pressure roller is automatically raised by a rear-stage height adjustment assembly to a set distance in the vertical direction relative to the rear-stage drive roller before the card moves near the rear-stage pressure roller and the front end of the card touches the rear-stage pressure roller.

[0025] The front-stage height adjustment component consists of a front-stage pressure plate, a front-stage connecting rod and a front-stage drive connecting plate. The front-stage pressure plate is arranged above the front-stage drive roller. The front side or rear side of the front-stage pressure plate is connected to the frame of the printer through a front-stage hinge shaft. The front-stage pressure roller is rotatably mounted on the front-stage pressure plate and is located directly above the front-stage drive roller. The other side of the front-stage pressure plate opposite to the front-stage hinge shaft is connected to the front-stage drive connecting plate arranged under the front-stage drive roller in a hinged manner through the front-stage connecting rod. The front-stage drive connecting plate is connected to the front-stage drive device. Driven by the front-stage drive device, the front-stage drive connecting plate forces the front-stage pressure plate to rotate around the front-stage hinge shaft and causes the front-stage pressure roller to move up and down in the vertical direction.

[0026] The print height adjustment assembly consists of a bracket side plate for installing the print head, a bracket top plate, a fixed side plate and an abutment plate. The fixed side plate is two pieces, which are respectively fixed to the inner surface of the printer's cover. The bracket side plate carries the print head and is installed between the two fixed side plates in a manner that can move up and down. The bracket top plate is assembled between the two fixed side plates above the bracket side plates. The front side of the bracket top plate is connected to the fixed side plate through a top plate hinge shaft. A top plate compression spring is provided between the rear side of the bracket top plate and the cover. The abutment plate is arranged below the print drive roller and connected to the print drive top device. When the print head is dropped and contacts the print drive roller, the abutment plate forces the bracket side plate carrying the print head to move up and down in the vertical direction through the drive of the print drive top device.

[0027] The rear-stage height adjustment assembly consists of a rear-stage pressure plate, a rear-stage connecting rod and a rear-stage drive connecting plate. The rear-stage pressure plate is arranged above the rear-stage drive roller. The front or rear side of the rear-stage pressure plate is connected to the frame of the printer through a rear-stage hinge shaft. The rear-stage pressure roller is rotatably mounted on the rear-stage pressure plate and is located directly above the rear-stage drive roller. The other side of the rear-stage pressure plate opposite to the rear-stage hinge shaft is connected to the rear-stage drive connecting plate arranged under the rear-stage drive roller in a hinged manner through the rear-stage connecting rod. The rear-stage drive connecting plate is connected to the rear-stage drive device. Driven by the rear-stage drive device, the rear-stage drive connecting plate forces the rear-stage pressure plate to rotate about the rear-stage hinge shaft and causes the rear-stage pressure roller to move up and down in the vertical direction.

[0028] The front-stage driving device, the rear-stage driving device and the printing top driving device use the same driving motor, which is a DC motor or a stepping motor, which transmits kinetic energy to the front-stage driving connecting plate, the rear-stage driving connecting plate and the abutting plate respectively through the gear transmission assembly.

[0029] The gear transmission assembly consists of an energy transmission gear assembly, a drive cam gear and a drive cam gear. The drive motor transmits kinetic energy to the drive cam gear and the drive cam gear through the energy transmission gear assembly. An intermediate gear is engaged between the drive cam gear and the drive cam gear. The rear drive connecting plate is installed on the frame through the rear drive shaft. The drive cam gear and the drive cam gear are respectively installed on the drive cam first rotating shaft and the drive cam second rotating shaft. The drive cam first rotating shaft and the drive cam second rotating shaft are parallel to the rear drive shaft and are respectively arranged on the bottom surface of the rear drive connecting plate at the rear On both sides of the drive shaft, at least one cam is provided on the first drive cam shaft and the second drive cam shaft, and the apex of the cam on the first drive cam shaft and the cam on the second drive cam shaft differs by 180 degrees in the circumferential direction; the front drive connecting plate is installed on the frame through the front drive shaft and is located under the rear drive connecting plate, and the rear side of the top surface of the front drive connecting plate abuts against the front side of the bottom surface of the rear drive connecting plate in a contact manner; the front-stage connecting rod is connected between the rear side of the front-stage pressure plate and the front side of the front drive connecting plate, and the rear-stage connecting rod is connected between the rear side of the rear-stage pressure plate and the rear side of the rear-stage connecting plate.

[0030] The abutment plate is an abutment block provided on the front area of ​​the top surface of the rear drive connecting plate or is the front top edge of the rear drive connecting plate.

[0031] The rear-drive connecting plate is installed on the frame through the rear-drive shaft, and the front-drive connecting plate is installed on the frame through the front-drive shaft and is located under the rear-drive connecting plate, and the rear side of the top surface of the front-drive connecting plate abuts against the front side of the bottom surface of the rear-drive connecting plate in a contact manner; the front-stage connecting rod is connected between the rear side of the front-stage pressure plate and the front side of the front-drive connecting plate, and the rear-stage connecting rod is connected between the rear side of the rear-stage pressure plate and the rear side of the rear-drive connecting plate; the front-stage, rear-stage and printing drive top devices share two cylinders, namely the front cylinder and the rear cylinder, the front end of the front cylinder piston rod abuts against the front side of the rear-drive connecting plate, and the front end of the rear cylinder piston rod abuts against the rear side of the rear-drive connecting plate, and the piston rod of the front cylinder and the piston rod of the rear cylinder move in opposite directions.

[0032] The abutment plate is an abutment block provided on the front area of ​​the top surface of the rear drive connecting plate or is the front top edge of the rear drive connecting plate.

[0033] The front-stage height adjustment component is composed of a front-stage left lifting plate, a front-stage right lifting plate and a front-stage driving device. A corresponding pressure roller shaft hole is respectively provided on the front-stage left lifting plate and the front-stage right lifting plate. The front-stage pressure roller is installed across the two pressure roller shaft holes. A vertical strip hole is respectively provided on the frame plate of the printer on the left and right sides for installing the front-stage driving roller. The two ends of the front-stage pressure roller shaft are placed in the vertical strip holes on the corresponding sides. The front-stage left lifting plate or the front-stage right lifting plate is connected to the front stage through a transmission connecting piece, which can make the front-stage left lifting plate and the front-stage right lifting plate rise or fall synchronously.

[0034] The print height adjustment assembly is composed of a left printing level lifting plate, a right printing level lifting plate and a printing level for installing the print head. A corresponding printing head shaft hole is respectively provided on the printing level lifting plate and the right printing level lifting plate. The print head is installed between the two printing head shaft holes by arranging printing head side shafts on its left and right sides. A vertical strip hole is respectively provided on the frame plate of the printer on the left and right sides for installing the print drive roller. The end of the printing head side shaft is placed in the vertical strip hole on the corresponding side. The printing level lifting plate or the printing level right lifting plate is connected to the printing level through a transmission connecting piece, which can make the printing level lifting plate and the printing level right lifting plate rise or fall synchronously.

[0035] The rear-stage height adjustment component is composed of a rear-stage left lifting plate, a rear-stage right lifting plate and a rear stage. A corresponding pressure roller shaft hole is respectively provided on the rear-stage left lifting plate and the rear-stage right lifting plate. The rear-stage pressure roller is installed across the two pressure roller shaft holes. A vertical strip hole is respectively provided on the frame plate of the printer on the left and right sides for installing the rear-stage driving roller. The two ends of the roller shaft of the rear-stage pressure roller are placed in the vertical strip holes on the corresponding sides. The rear-stage left lifting plate or the rear-stage right lifting plate is connected to the rear stage through a transmission connecting piece, which can make the rear-stage left lifting plate and the rear-stage right lifting plate rise or fall synchronously.

[0036] The front-stage left lifting plate, the front-stage right lifting plate, the rear-stage left lifting plate, the rear-stage right lifting plate, the printing-stage left lifting plate and the printing-stage right lifting plate have the same shape and structure. Each lifting plate is composed of an upper part and a lower part of an integral structure. The upper part is rectangular or elliptical. The pressure roller shaft hole or the print head shaft hole is arranged on the upper part, and the lower part is at least one support foot. The transmission connecting part is two sliding plates assembled on the slide rails that are parallel to each other and slide back and forth synchronously along the card conveying channel. The slide rails are fixed on the frame plate, and the top edge of the sliding plate is a saw. Tooth structure, the support feet on each lifting plate are placed in a corresponding tooth groove in the sawtooth structure and move between the bottom of the tooth groove and the top of the tooth as the sliding plate slides back and forth. In the sawtooth structure, the direction of the saw teeth corresponding to the front-stage lifting plate is the same as the direction of the saw teeth corresponding to the rear-stage lifting plate, and the direction of the saw teeth corresponding to the front-stage lifting plate is opposite to the direction of the saw teeth corresponding to the printing stage lifting plate; when the support feet on the front-stage lifting plate and the rear-stage lifting plate fall into the bottom of the corresponding tooth groove, the support feet on the printing stage lifting plate fall at the top of the tooth of the corresponding tooth groove.

[0037] The distance between the front support leg and the rear support leg of the front-stage lifting plate is the same as the tooth pitch of the saw teeth in the corresponding sawtooth structure; the front-stage driving device, the rear-stage driving device and the printing-stage driving device are motors arranged on one side of the sliding plate and can drive the sliding plate to move back and forth in a straight line.

[0038] The front-stage height-adjusting assembly includes a front-stage left horizontal plate and a front-stage right connecting rod, which is divided into a vertical plate portion and a horizontal plate portion. The horizontal plate portion is parallel to the front-stage left horizontal plate. The front-stage pressure roller is installed between the front-stage left horizontal plate and the horizontal plate portion in a bridging manner. Axis holes are respectively provided on the horizontal plate portion and the front-stage left horizontal plate on the side opposite to the vertical plate portion. A rotating shaft is provided between the two axis holes. The left end of the rotating shaft is fixed or rotatably connected to the vertically arranged left base plate through the corresponding axis hole. A front-stage driving device is provided under the vertical plate portion, which can drive the front-stage right connecting rod to rotate around the axis of the rotating shaft. The front-stage pressure roller is forced to lift or fall as the front stage rotates forward or reverse.

[0039] The print height adjustment assembly includes a print level slider, a print level slide rail and a print level right connecting rod. The print level slider is fixed to the left side of the print head, and the print level slide rail is fixed to the left base plate. The print level right connecting rod is divided into a vertical plate portion and a horizontal plate portion. The horizontal plate portion is fixed to the right side of the print head, and the vertical plate portion extends downward. A print level is provided under the vertical plate portion, which can drive the print level right connecting rod to carry the print head up and down along the print level slide rail.

[0040] The rear-stage height-adjusting assembly includes a rear-stage left horizontal plate and a rear-stage right connecting rod, and the rear-stage right connecting rod is divided into a vertical plate portion and a horizontal plate portion (the horizontal plate portion is parallel to the rear-stage left horizontal plate, and the rear-stage pressure roller is installed between the rear-stage left horizontal plate and the horizontal plate portion in a bridge manner, and an axis hole is respectively provided on the horizontal plate portion and the rear-stage left horizontal plate on the side opposite to the vertical plate portion, and a rotating shaft is provided between the two axis holes. The left end of the rotating shaft passes through the corresponding axis hole and is fixed or rotatably connected to the left base plate, and a rear stage is provided under the vertical plate portion, which can drive the rear-stage right connecting rod to rotate around the axis of the rotating shaft, and the rear-stage pressure roller is forced to rise or fall as the rear-stage right connecting rod rotates forward or reverse.

[0041] The front-stage height adjustment component includes a front-stage slider plate, a front-stage slide rail and a front-stage right connecting plate. The front-stage slide rail is fixed on the vertically arranged left base plate. The front-stage slider plate is parallel to the front-stage right connecting rod. The front-stage pressure roller is assembled between the front-stage slider plate and the front-stage right connecting rod plate. Under the front-stage right connecting plate is a front-stage driving device that can drive the front-stage right connecting plate and the front-stage pressure roller to move up and down along the front-stage slide rail.

[0042] The print height adjustment assembly includes a print level slider, a print level slide rail and a print level right connecting rod. The print level slider is fixed to the left side of the print head, and the print level slide rail is fixed to the left base plate. The print level right connecting rod is divided into a vertical plate portion and a horizontal plate portion. The horizontal plate portion is fixed to the right side of the print head, and the vertical plate portion extends downward. A print level is provided under the vertical plate portion, which can drive the print level right connecting rod to carry the print head up and down along the print level slide rail.

[0043] The rear-stage height adjustment component includes a rear-stage slider plate, a rear-stage slide rail and a rear-stage right connecting plate. The rear-stage slide rail is fixed on the vertically arranged left base plate. The rear-stage slider plate is parallel to the rear-stage right connecting plate. The rear-stage pressure roller is assembled between the rear-stage slider plate and the rear-stage right connecting plate. Under the rear-stage right connecting plate is a rear-stage driving device that can drive the rear-stage right connecting plate and the rear-stage pressure roller to move up and down along the rear-stage slide rail.

[0044] The front-stage driving device, the rear-stage driving device and the printing-stage driving device are screw motors, electromagnetic suction components and cylinders.

[0045] The rear stage height adjustment component is the rear stage right connecting plate, the rear stage pressure roller is assembled on the rear stage right connecting plate, and the front stage moves up and down along the front stage slide rail with the front stage pressure roller and the rear stage pressure roller through the front stage right connecting plate, the right connecting plate and the rear stage right connecting plate.

[0046] The front-stage height adjustment assembly includes a front-stage slider plate, a front-stage slide rail, a front-stage right connecting plate and a synchronous belt. The front-stage slide rail is fixed on the vertically arranged left base plate. The front-stage slider plate and the front-stage right connecting plate are parallel to each other. The front-stage pressure roller is assembled between the front-stage slider plate and the front-stage right connecting plate. Two synchronous wheels are installed on the right base plate. The synchronous belt is sleeved between the two synchronous wheels. A fastening connector that can be fixed to the front-stage right connecting plate is provided on the synchronous belt. As the synchronous belt rotates forward or reverse, the front-stage right connecting plate carries the front-stage pressure roller and moves up and down along the front-stage slide rail.

[0047] The print height adjustment assembly includes a printing grade slider, a printing grade slide rail, a printing grade right connecting rod and a synchronous belt. The printing grade slider is fixed to the left side of the print head, the printing grade slide rail is fixed to the left base plate, the printing grade right connecting plate is fixed to the right side of the print head, two synchronous wheels are installed on the right base plate, and the synchronous belt is sleeved between the two synchronous wheels. A fastening connector that can be fixed to the printing grade right connecting plate is provided on the synchronous belt. As the synchronous belt rotates forward or reverse, the printing grade right connecting rod carries the print head up and down along the printing grade slide rail.

[0048] The rear-stage height adjustment assembly includes a rear-stage slider plate, a rear-stage slide rail, a rear-stage right connecting plate and a synchronous belt. The rear-stage slide rail is fixed on the vertically arranged left base plate. The rear-stage slider plate and the rear-stage right connecting plate are parallel to each other. The rear-stage pressure roller is assembled between the rear-stage slider plate and the rear-stage right connecting plate. Two synchronous wheels are installed on the right base plate. The synchronous belt is sleeved between the two synchronous wheels. A fastening connector that can be fixed to the rear-stage right connecting plate is provided on the synchronous belt. As the synchronous belt rotates forward or reverse, the rear-stage right connecting plate carries the rear-stage pressure roller and moves up and down along the rear-stage slide rail.

[0049] The rear-stage height adjustment component is the rear-stage right connecting plate, and the rear-stage pressure roller is assembled on the rear-stage right connecting plate. The front-stage driving device carries the front-stage pressure roller and the rear-stage pressure roller up and down along the front-stage slide rail through the synchronous wheel, synchronous belt, the front-stage right connecting plate, the right connecting plate and the rear-stage right connecting plate.

[0050] The front-stage driving device, the rear-stage driving device and the printing-stage driving device are DC motors or stepping motors.

[0051] The front-stage driving device, the rear-stage driving device and the printing-stage driving device are DC motors or stepping motors.

[0052] The above-mentioned structure can ensure uniform and continuous transmission of the printing medium. After the printer obtains the card thickness information, the pressure roller and the print head assembly can be adjusted to a height that can pass the card. Therefore, it is suitable for printing on thin and thick cards, and the forward speed is uniform, and the printed content will not be stretched and deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 A schematic diagram of the outer contour of the printer of the present invention;

[0055] Figure 2 Schematic diagram of the internal structure of the printer in Example 1;

[0056] Figure 3 for Figure 2 Schematic diagram of the internal structure after removing the casing;

[0057] Figure 4 This is a schematic diagram of the structure of the print height adjustment component in Example 1;

[0058] Figure 5 for Figure 4 Print the exploded view of the height adjustment component;

[0059] Figure 6 for Figure 4 Print the exploded view of the height adjustment component;

[0060] Figure 7 This is a schematic diagram of the print height adjustment component pressing against the print drive roller in Example 1;

[0061] Figure 8 for Figure 6 Partial exploded view;

[0062] Figure 9 Cam scheme structure diagram in Example 1;

[0063] Figure 10 for Figure 9 Cam explosion diagram;

[0064] Figure 11 for Figure 9 Schematic diagram of replacing the cam with the cylinder in Example 1;

[0065] Figure 12 For Example 1 Figure 11 right oblique view;

[0066] Figure 13 This is the front view of Example 2 (sawtooth solution);

[0067] Figure 14 for Figure 13 AA section view in;

[0068] Figure 15 for Figure 13 A perspective view of Example 2 (sawtooth scheme);

[0069] Figure 16 for Figure 13 A perspective view of Example 2 (the sliding plate in the front-stage height adjustment component, the printing height adjustment component, and the rear-stage height adjustment component is an integrated structure);

[0070] Figure 17 for Figure 16 Exploded view;

[0071] Figure 18 Schematic diagram of the preceding and following pressure rollers being raised and the print head being pressed downward (sawtooth solution) in Example 2;

[0072] Figure 19 Schematic diagram of the preceding and succeeding pressure rollers in Example 2 rising and the print head pressing down simultaneously (sawtooth solution);

[0073] Figure 20 Schematic diagram of the front-stage pressure roller and the rear-stage pressure roller pressing down and the print head rising (sawtooth solution) in Example 2;

[0074] Figure 21 This is a schematic diagram of Example 3 (cylinder solution);

[0075] Figure 22 This is a schematic diagram of the two-cylinder solution of Example 4;

[0076] Figure 23 for Figure 22 Partial exploded view;

[0077] Figure 24 This is a schematic diagram of the screw rod scheme of Example 4;

[0078] Figure 25 for Figure 24 Exploded diagram of the screw rod solution;

[0079] Figure 26 Schematic diagram of three screw rods in Example 4;

[0080] Figure 27 This is a schematic diagram of Example 5 (synchronous belt solution);

[0081] Figure 28 for Figure 27 Schematic diagram of the scheme of replacing with two synchronous belts;

[0082] Figure 29 for Figure 28 Partial exploded view of the synchronous belt.

[0083] The reference numerals are as follows:

[0084] Card printer 1, machine cover 11, machine casing 12, card magazine 13, print head assembly 14, print head 141, print drive roller 142, removal channel 15, front-stage counter-pressure roller assembly 16, front-stage pressure roller 161, front-stage drive roller 162, rear-stage counter-pressure roller assembly 17, rear-stage pressure roller 171, rear-stage drive roller 172, sensor device 18.

[0085] Front-stage height adjustment assembly 100, front-stage pressure plate 101, front-stage connecting rod 102, front-drive connecting plate 103, front-stage hinge shaft 104, front-stage return spring 105, front-stage left lifting plate 106, front-stage right lifting plate 107, pressure roller shaft hole 108, front-stage left frame plate 109, front-stage right frame plate 110, front-stage left horizontal plate 111, front-stage right connecting rod 112, front-stage slider plate 113, front-stage slide rail 114, front-stage right connecting plate 115.

[0086] Print height adjustment component 200, fixed side plate 201, bracket top plate 202, bracket side plate 203, abutment plate 204, printing level lifting plate 205, printing level right lifting plate 206, printing level left frame plate 207, printing level right frame plate 208, print head shaft hole 209, print head side shaft 210, printing level slider 211, printing level slide rail 212, printing level right connecting rod 213, protrusion 216, strip guide hole 217, top cover plate 218, top plate compression spring 219, hook 220, hanging shaft 221, top plate hinge shaft 222.

[0087] Rear-stage height adjustment assembly 300, rear-stage pressure plate 301, rear-stage connecting rod 302, rear-drive connecting plate 303, rear-stage hinge shaft 304, rear-stage return spring 305, rear-stage left lifting plate 306, rear-stage right lifting plate 307, rear-stage left frame plate 308, rear-stage right frame plate 309, rear-stage left cross plate 310, rear-stage right connecting rod 311, rear-stage slider plate 312, rear-stage slide rail 313, rear-stage right connecting plate 314, and right connecting plate 417.

[0088] Vertical strip hole 401, front support foot 402, rear support foot 403, vertical plate part 404, horizontal plate part 405, synchronous belt 407, left base plate 408, synchronous wheel 409, fastening connector 410, side ear plate 411, driving device 412 (referring to front-stage driving device, printing stage driving device, printing top driving device or rear-stage driving device), sliding plate 413.

[0089] Gear transmission assembly 500, energy transmission gear assembly 501, drive cam first gear 502, drive cam second gear 503, intermediate gear 504, drive cam first rotating shaft 505, drive cam second rotating shaft 506, cam 507, drive motor 508, front cylinder 509, rear cylinder 510, front drive shaft 511, rear drive shaft 512. DETAILED DESCRIPTION

[0090] 1. Overview

[0091] like Figures 1 to 29 As shown, the card printer 1 of the present invention can ensure that the cards to be printed are transported at a uniform speed.

[0092] The card transport channel of the printer 1 is provided with a card hopper 13 for storing blank cards (i.e., cards to be printed), a print head assembly 14, and a removal channel 15 for removing cards with printed text and patterns (hereinafter referred to as content cards) from the printer from the front to the back.

[0093] In the card conveying passage, a front-stage pressing roller assembly 16 for driving blank cards and a sensor device 18 for detecting the position of blank cards are sequentially provided between the card bin 13 and the print head assembly 14 .

[0094] like Figure 1 As shown, the front-stage pressing roller assembly 16 is arranged at the front side of the print head assembly 14 (the blank card entrance is the front and the removal channel side is the back). Figure 1 Taking the paper as an example, the left side is the front and the right side is the back, the same applies below. The front-stage pressure roller assembly 16 is used to roll the card toward the printhead assembly 14. It consists of a pressure roller (hereinafter referred to as the front-stage pressure roller 161) and a drive roller (hereinafter referred to as the front-stage drive roller 162) installed in the printer 1, stacked one above the other. The front-stage pressure roller 161 can press the blank card against the front-stage drive roller 162 below it with a certain pressure, increasing the friction between the card and the front-stage drive roller 162, and preventing the front-stage drive roller 162 from slipping when rolling the card.

[0095] One of the improvements of the present invention is to enable the front-stage pressure roller 161 to pass through the front-stage height adjustment component 100 which automatically adjusts the height, so that when the card moves near the front-stage pressure roller 161 and before the front end of the card (the "front end" here refers to the head end of the card during the process of the card moving from front to back in the card conveying channel, the same below) is about to touch the front-stage pressure roller 161 and / or the rear end of the card (the "rear end" here refers to the tail end of the card during the process of the card moving from front to back in the card conveying channel, the same below) is about to break away from the two position nodes where the front-stage pressure roller 161 presses against it, it is raised upward in the vertical direction by a set distance (the distance is 0mm-4mm, preferably 0mm-3.1mm) relative to the front-stage driving roller 162.

[0096] The sensor device 18 is used to accurately detect the status signals of the card position, card width and card thickness, and transmit the signals to the main control circuit.

[0097] A further improvement of the present invention is that the print head 141 in the print head assembly 14 is automatically raised vertically by a drive roller (hereinafter referred to as the print drive roller 142) below the print head 141 by a predetermined distance (0 mm to 4 mm, preferably 0 mm to 3.7 mm) when the card approaches the print head 141 and the card's front end is about to contact the print head 141 and / or the card's rear end is about to break away from the pressure of the print head 141. The print head assembly 14 includes the print head 141 and the print drive roller 142 disposed below the print head 141 for rolling the card.

[0098] Another improvement of the present invention is that a rear-stage pressure roller assembly 17 for rolling the card to move forward is provided on the rear side of the print head assembly 14. The rear-stage pressure roller assembly 17 is composed of a pressure roller (hereinafter referred to as the rear-stage pressure roller 171) and a drive roller (hereinafter referred to as the rear-stage drive roller 172) installed in the printer in an upper and lower stacked manner. The rear-stage pressure roller 171 is automatically height-adjusted by a rear-stage height adjustment assembly 300. When the content card moves near the rear-stage pressure roller 171 and the front end of the card is about to touch the position node before the rear-stage pressure roller 171, it is raised upward in the vertical direction by a set distance (the distance is 0mm-4mm, preferably 0mm-2.7mm) relative to the rear-stage drive roller 172.

[0099] When the card is loaded into the card bin 13, the sensor arranged on the printer 1 detects the card thickness information, and the main control circuit can control the raising amplitude of the front-stage pressure roller 161 in the front-stage height adjustment component 100, the print head 141 in the print height adjustment component 200 and the rear-stage pressure roller 171 in the rear-stage height adjustment component 300.

[0100] The maximum beneficial effects of the present invention by providing the front-stage height adjustment component 100, the printing height adjustment component 200 and the rear-stage height adjustment component 300 are as follows:

[0101] 1. Pre-stage height adjustment component 100

[0102] When the front end of the card moving at the set speed is about to touch the front-stage pressure roller 161, the front-stage pressure roller 161 rises, which can avoid the front end of the moving card from temporarily pausing due to resistance caused by the collision with the front-stage pressure roller 161, ensuring that the card moves at a stable and uniform speed in the card transmission channel. At the same time, it can also avoid the situation where the card is blocked from moving due to excessive thickness.

[0103] When the rear end of a card traveling at a set speed is about to leave the contact of the front-stage pressure roller 161, the front-stage pressure roller 161 rises. This prevents the card from being pushed toward the printhead assembly 14 in a sudden, jumpy manner due to the pressure exerted by the front-stage pressure roller 161 and the front-stage drive roller 162 that rolls the card. (That is, when the rear edge of the card moves and passes the vertical plane position of the front-stage pressure roller 161 above the axis, the front-stage pressure roller 161 loses its support from the card. Under the action of other components exerting downward pressure on the front-stage pressure roller 161, the front-stage pressure roller 161 presses downward, causing the card to be quickly ejected.) This prevents the print quality of the portion of the card currently being printed below the printhead 141 from being delayed or misaligned due to the rapid extrusion of the card, resulting in a positional lag in the "line content" (i.e., the content displayed in each line of the printed text pattern). (Typically, the distance between the front-stage drive roller 162 and the print drive roller 142 is less than the length of a single card.)

[0104] Print height adjustment component 200.

[0105] When the front end of the card moving at a set speed is about to touch the print head 141, the print head 141 rises. This can ensure that the card moves at a stable and uniform speed in the card conveying channel. On the other hand, it can avoid the occurrence of card movement being blocked due to excessive thickness. On the other hand, it can prevent the card from pausing for a short time after encountering resistance, thereby avoiding errors in printing time.

[0106] 3. Adjust the height of the post-stage components by 300.

[0107] When the front end of the card moving at the set speed is about to touch the rear-stage pressure roller 171, the rear-stage pressure roller 171 rises to avoid the moving card from encountering resistance and causing a short pause. On the one hand, this setting can ensure that the card moves at a stable and uniform speed in the card transmission channel. On the other hand, it can avoid the sudden pause of the card moving speed due to obstruction, which may cause the print quality of the part of the card being printed under the print head 141 to be offset and misaligned in advance.

[0108] 2. The embodiments of the present invention that can achieve the above beneficial effects are as follows:

[0109] (1) Example 1

[0110] 1. Basic solution of this embodiment

[0111] 1) Pre-amplifier height adjustment component 100

[0112] like Figure 3 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10As shown, it is composed of a pressure plate (hereinafter referred to as the front stage pressure plate 101), a connecting rod (hereinafter referred to as the front stage connecting rod 102) and a connecting plate (hereinafter referred to as the front drive connecting plate 103).

[0113] The front-stage pressure plate 101, which is preferably a rectangular plate, is arranged above the front-stage driving roller 162. The front side or rear side (preferably the front side in the present invention) of the front-stage pressure plate 101 is connected to the frame of the printer 1 (the frame is an integrally formed frame arranged in the printer housing 12 and the card conveying channel is formed by the frame) through the front-stage hinge shaft 104 (the front-stage hinge shaft is preferably a bearing connection), and a spring (hereinafter referred to as the front-stage return spring 105) is arranged on the front-stage hinge shaft.

[0114] The middle area of ​​the front-stage pressure plate 101 is a hollow structure, and the hollow space is used to accommodate the front-stage pressure roller 161. The front-stage pressure roller 161 consists of a roller sleeve, a sleeve, and a roller shaft. The roller sleeve is made of low-viscosity plastic and its function is to clean the blank card before printing when it enters the printer 1, and to effectively remove foreign matter on the card. The roller sleeve is connected to the sleeve, and the connection can be fixed or rotatable. A roller shaft is inserted into the sleeve, and an annular groove is provided at each end of the roller shaft. The roller sleeve and sleeve are confined between the two annular grooves by a spring clip, and the sleeve can carry the roller sleeve and rotate freely on the roller shaft. A shaft sleeve and a shaft hole are respectively provided on the front-stage pressure plate 101 on the left and right sides of the hollow space. One end of the roller shaft of the front-stage pressure roller 161 is inserted into the shaft sleeve, and the other end of the roller shaft is inserted into the shaft hole through a quick disassembly structure. The front-stage pressing roller 161 is rotatably mounted on the front-stage pressing plate 101 and is located directly above the front-stage driving roller 162 .

[0115] There are preferably two front-stage connecting rods 102, namely a left front-stage connecting rod and a right front-stage connecting rod. The cross-sectional shape of the front-stage connecting rod 102 is preferably rectangular. The two front-stage connecting rods 102 are vertically arranged, and their upper ends are connected to the other side of the front-stage hinge shaft 104 on the front-stage pressure plate 101 through a hinge structure. The preferred hinge structure of the present invention is: a downwardly extending side ear plate 411 is provided on the other side of the front-stage pressure plate 101, and a vertical waist hole (i.e., a strip hole) is provided on the side ear plate 411. The function of the waist hole is to reserve a redundant space for the front-stage pressure roller 161 to be lifted up when the front-stage pressure roller 161 is pulled downward by the front-stage connecting rod 102 and pressed against the front-stage driving roller 162, so that the blank card in motion enters between the front-stage pressure roller 161 and the front-stage driving roller 162.

[0116] The front stage connecting rod 102 can be set in two ways:

[0117] The first type is connected to the frame via a positioning hole provided thereon and a support shaft passing through the positioning hole.

[0118] The second type is to set a front drive connecting plate 103 at the lower end of the front stage connecting rod 102, one end of the front drive connecting plate 103 is hinged to the lower end of the front stage connecting rod 102, and the front drive connecting plate 103 is connected to the frame.

[0119] The second arrangement is preferred in the present invention. The front drive connecting plate 103 is mainly used to transmit the kinetic energy output by the driving device (hereinafter referred to as the front drive device) to the front connecting rod 102, so as to move the front connecting rod 102 up and down, thereby raising or lowering the front pressure plate 101 and the front pressure roller 161.

[0120] In the first method mentioned above, the front-stage drive connecting plate 103 and the front-stage connecting rod 102 are integrated into one, that is, the part below the support shaft on the front-stage connecting rod 102 can be regarded as the front-stage drive connecting plate 103, and the front-stage driving device is connected to the lower end of the front-stage connecting plate 102 through a transmission connecting member. When driven by the front-stage driving device, the front-stage pressure plate 101 is forced to rotate around the front-stage hinge shaft 104 as the axis and the front-stage pressure roller 161 moves up and down in the vertical direction.

[0121] In the second embodiment described above, the front-drive connecting plate 103 is an independent component, which is arranged horizontally and connected to the frame via positioning holes and support shafts provided thereon. The front end of the front-drive connecting plate 103 is hingedly connected to the lower end of the front-stage connecting rod 102, and the rear end of the front-stage connecting plate 103 is connected to the front-stage driving device via a transmission connection. By applying a downward or upward force to the rear end of the front-drive connecting plate 103, the front end of the front-drive connecting plate 103 can be rotated about the support shaft axis and push the front-stage connecting rod 102 upward or pull the front-stage connecting rod 102 downward, thereby forcing the front-stage pressure plate 101 to rotate about the front-stage hinge shaft 104 as the axis and causing the front-stage pressure roller 161 to move up and down in the vertical direction. The front-stage return spring 105 keeps the side of the front-stage pressure plate 101 where the front-stage hinge shaft 104 is not provided in a downward pressure state at all times. Its function is to keep the front-stage pressure roller 161 in a downward pressure state when the front-stage pressure plate 101 does not apply driving force to it through the front-stage connecting rod 102 by the front-stage connecting plate 103.

[0122] The front-stage driving device can be a stepping motor, a lead screw motor, a cylinder or an electromagnetic attraction component.

[0123] 2) Print height adjustment component 200

[0124] like Figures 3 to 10 As shown, the print height adjustment assembly 200 consists of a connecting plate (hereinafter referred to as the fixed side plate 201 ) fixed to the printer cover 11 , a top plate (hereinafter referred to as the bracket top plate 202 ), a side plate for mounting the print head 141 (hereinafter referred to as the bracket side plate 203 ) and an abutment plate 204 .

[0125] a. The fixed side panels 201 are preferably two panels that are symmetrical and parallel to each other with respect to the card transport channel, namely a left fixed side panel and a right fixed side panel. The left fixed side panel and the right fixed side panel are fixedly connected together by a top cover panel 218. The top cover panel 218 can be the cover panel of the printer or a separate flat panel. The left fixed side panel, the right fixed side panel and the top cover panel 218 can also be an integral structure.

[0126] An open hook 220 is provided on the lower rear side of the fixed side plate 201. The print head 141 can be quickly installed on the fixed side plate 201 through a hanging shaft 221 provided on the outside of the print head shell. Its function is to quickly and conveniently remove the print head 141 when the print head 141 needs to be replaced.

[0127] b. The bracket top plate 202 is mounted on the top of the print head 141. The front side of the bracket top plate (202) is connected to the fixed side plate 201 through the top plate hinge shaft (222). The two outer sides of the rear portion are provided with protrusions 216. Correspondingly, strip guide holes 217 are provided on the left fixed side plate and the right fixed side plate. The rear portion of the bracket top plate 202 is placed in the strip guide hole 217 through the protrusion 216 and assembled under the top cover plate 218. A compression spring (hereinafter referred to as the top plate compression spring 219) is provided between the top surface of the rear portion of the bracket top plate 202 and the top cover plate 218. Usually, under the action of the top plate compression spring 219, the protrusion 216 is placed at the lower end of the strip guide hole 217. When the bracket top plate 202 is subjected to an upward external force, the protrusion 216 can move up in the strip guide hole 217 to the upper end of the strip guide hole 217.

[0128] c. The bracket side panels 203 consist of two pieces: a left bracket side panel and a right bracket side panel. These two bracket side panels 203 are fixed to the left and right sides of the printhead housing, respectively. The hanging shaft 221 on the printhead 141 is a short cylindrical shaft located above the outer sides of the bracket side panels 203. By hooking the hanging shaft 221 onto the hook 220, the printhead 141 can be mounted between the left and right fixed side panels.

[0129] The lower end of the bracket side panel 203 has an inverted "U"-shaped notch (the function of the notch is to avoid the roller shaft of the print drive roller 142). When the lower end of the bracket side panel 203 is subjected to an upward force, the bracket side panel 203 carrying the print head 141 can move upward. When moving upward, the bracket top plate 202 exerts an upward force to compress the top plate compression spring 219. The upward movement distance is the stroke of the protrusion 216 in the strip guide hole 217.

[0130] d. The abutment plate 204 is mainly used to transfer the kinetic energy output by the driving device (hereinafter referred to as the printing drive top device) to the bracket side plate 203, so that the bracket side plate 203 moves upward, thereby lifting the bracket side plate 203 and the print head 141. The abutment plate 204 is an independent component, which is horizontally arranged and connected to the frame through the positioning holes and support shafts set thereon. The bottom end of the bracket side plate 203 touches the abutment plate 204. The bracket side plate 203 of the present invention can also not touch the abutment plate 204. A certain space distance is set between the bracket side plate 203 and the abutment plate 204 (the space distance is the space height reserved for the abutment plate 204 to lift the bracket side plate 203 upward), and the abutment plate 204 is connected to the printing drive top device through a transmission connection.

[0131] When the print head 141 needs to be lifted up and out of contact with the print drive roller 142, the abutment plate 204 is driven by the print drive device to force the bracket side plate 203 to move upward in the vertical direction with the print head 141.

[0132] The printing top driving device can be a stepping motor, a lead screw motor, a cylinder or an electromagnetic attraction component.

[0133] 3) Post-stage height adjustment component 300

[0134] like Figure 3 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown, the rear-stage height adjustment assembly 300 is composed of a pressure plate (hereinafter referred to as the rear-stage pressure plate 301 ), a connecting rod (hereinafter referred to as the rear-stage connecting rod 302 ) and a connecting plate (hereinafter referred to as the rear-drive connecting plate 303 ).

[0135] The rear-stage pressure plate 301, which is preferably a rectangular plate, is arranged above the rear-stage driving roller 172. The front side or rear side (preferably the front side in the present invention) of the rear-stage pressure plate 301 is connected to the printer frame (the frame is an integrally formed frame arranged in the printer housing 102 and the card conveying channel is formed by the frame) through the rear-stage hinge shaft 304 (the rear-stage hinge shaft is preferably connected by a bearing), and a spring (hereinafter referred to as the rear-stage return spring 305) is provided on the rear-stage hinge shaft 304.

[0136] The middle area of ​​the rear pressure plate 301 is hollowed out to accommodate the rear pressure roller. The rear pressure roller 171 is rotatable (the roller shafts at both ends are connected across the shaft holes on the rear pressure plate 301) and is installed on the rear pressure plate 301 and directly above the rear drive roller 172.

[0137] There are preferably two rear-stage connecting rods 302, namely a left rear-stage connecting rod and a right rear-stage connecting rod. The cross-sectional shape of the rear-stage connecting rod 302 is preferably rectangular. The two rear-stage connecting rods 302 are vertically arranged, and their upper ends are connected to the other side opposite to the rear-stage hinge shaft 304 on the rear-stage pressure plate 301 through a hinge structure.

[0138] The present invention preferably adopts the hinge structure as follows: a side ear plate 411 extending downward is provided on the other side of the rear-stage pressure plate 301, and a vertical waist hole (i.e., a strip hole) is provided on the side ear plate 411. The function of the waist hole is the same as that of the side ear plate 411 provided on the front-stage pressure plate 101.

[0139] The rear connecting rod 302 can be set in two ways:

[0140] The first type is connected to the frame via a positioning hole provided thereon and a support shaft passing through the positioning hole.

[0141] The second method is to set a rear drive connecting plate 303 at the lower end of the rear stage connecting rod 302, one end of the rear drive connecting plate 303 is hinged to the lower end of the rear stage connecting rod 155, and the rear drive connecting plate 303 is connected to the frame.

[0142] The second arrangement is preferred in the present invention. The rear drive connecting plate 303 is mainly used to transmit the kinetic energy output by the drive device (hereinafter referred to as the rear drive device) to the rear connecting rod 302, so that the rear connecting rod 302 moves up and down, thereby raising or lowering the rear pressure plate 301 and the rear pressure roller 171.

[0143] In the first method mentioned above, the rear-stage drive connecting plate 303 and the rear-stage connecting rod 302 are integrated into one, that is, the part below the support shaft on the rear-stage connecting rod 302 can be regarded as the rear-stage drive connecting plate 303, and the rear-stage driving device is connected to the lower end of the rear-stage connecting rod 302 through a transmission connecting member. When driven by the rear-stage driving device, the rear-stage pressure plate 301 is forced to rotate around the rear-stage hinge shaft 304 as the axis and the rear-stage pressure roller 171 moves up and down in the vertical direction.

[0144] In the second embodiment described above, the rear-drive connecting plate 303 is an independent component, which is arranged horizontally and connected to the frame via positioning holes and support shafts provided thereon. The front end of the rear-drive connecting plate 303 is hingedly connected to the lower end of the rear-stage connecting rod 302, and the rear end of the rear-drive connecting plate 303 is connected to the rear-stage drive device via a transmission connection. By applying a downward or upward force to the rear end of the rear-drive connecting plate 303, the front end of the rear-drive connecting plate 303 can be rotated about the support shaft axis and push the rear-stage connecting rod 302 upward or pull the rear-stage connecting rod 302 downward, thereby forcing the rear-stage pressure plate 301 to rotate about the rear-stage hinge shaft 304 and causing the rear-stage pressure roller 171 to move up and down in the vertical direction. The rear-stage return spring 305 ensures that the side of the rear-stage pressure plate 301 where the rear-stage hinge shaft 304 is not provided is always in a downward pressure state. Its function is to keep the rear-stage pressure roller 171 in a downward pressure state when the rear-stage pressure plate 301 does not apply driving force to it through the rear-stage connecting rod 302.

[0145] The subsequent driving device may be a stepping motor, a lead screw motor, a cylinder or an electromagnetic attraction component.

[0146] 2. Further improvements to this embodiment

[0147] The aforementioned front-stage driving device, rear-stage driving device and printing top driving device are combined to use the same driving motor 508, which is a DC motor or a stepping motor, and transmits kinetic energy to the front-stage driving connecting plate 103, rear-stage driving connecting plate 303 and abutment plate 204 respectively through the gear transmission assembly 500.

[0148] The front drive connecting plate 103 is installed on the frame through the front drive shaft 511, and the rear top surface of the front drive connecting plate 103 is located below the front bottom surface of the rear drive connecting plate 303. The rear side of the top surface of the front drive connecting plate 103 abuts against the front side of the bottom of the rear drive connecting plate 303 in a contact manner.

[0149] The front stage connecting rod 102 is connected between the rear side of the front stage pressure plate 101 and the front side of the front drive connecting plate 103 , and the rear stage connecting rod 302 is connected between the rear side of the rear stage pressure plate 301 and the rear side of the rear drive connecting plate 303 .

[0150] The rear drive connecting plate 303 is mounted on the frame via the rear drive shaft 512 .

[0151] The abutment plate 204 is an abutment block provided on the front area of ​​the top of the rear drive connecting plate 303 or is the front top edge of the rear drive connecting plate 303 .

[0152] The gear transmission assembly 500 is composed of a plurality of gears (hereinafter referred to as the energy transmission gear assembly 501 , the first drive cam gear 502 and the second drive cam gear 503 ). The driving motor 508 transmits kinetic energy to the driving cam gear 502 and the driving cam gear 503 through the energy transmission gear assembly 501, and an intermediate gear 504 is engaged between the driving cam gear 502 and the driving cam gear 503; the driving cam gear 502 and the driving cam gear 503 are respectively mounted on two rotating shafts (hereinafter referred to as the driving cam rotating shaft 505 and the driving cam gear 506), the driving cam rotating shaft 505 and the driving cam gear 506 are parallel to the rear drive shaft 512 and are respectively arranged on the bottom surface of the rear drive connecting plate 303 on both sides of the rear drive shaft 512, and at least one cam 507 is respectively provided in the middle of the bottom surface of the driving cam rotating shaft 505 and the driving cam gear 506, and the apex of the cam 507 on the driving cam rotating shaft 505 and the cam 507 on the driving cam gear 506 differ by 180 degrees in the circumferential direction.

[0153] The energy transmission gear assembly 501 transmits kinetic energy to the first drive cam gear 502 and the second drive cam gear 503, and the first drive cam gear 502 and the second drive cam gear 503 drive the cam 507 provided on the first drive cam rotating shaft 505 and the second drive cam rotating shaft 506 to rotate. Since the apex of the cam 507 on the first drive cam rotating shaft 505 and the apex of the cam 507 on the second drive cam rotating shaft 506 differ by 180 degrees in the circumferential direction, when they rotate, the front and rear ends of the rear drive connecting plate 303 can swing up and down (forming a seesaw phenomenon).

[0154] Working status of the height adjustment component in this embodiment:

[0155] When the top point of the cam 507 on the first drive shaft 505 rotates upward, the top point of the cam 507 on the second drive shaft 506 rotates downward, causing the front end of the rear drive connecting plate 303 to swing downward and the rear end to swing upward. The top surface of the rear side of the front drive connecting plate 103 is pressed down by the bottom surface of the front end of the rear drive connecting plate 303, forcing the front end of the front drive connecting plate 103 to move upward. At this time, the front-stage height adjustment component 100 and the rear-stage height adjustment component 300 are vertically raised relative to the front-stage drive roller 162 and the rear-stage drive roller 172 by a set distance, and the print height adjustment component 200 is vertically pressed downward on the print drive roller 142 relative to the print drive roller 142.

[0156] When the apex of the cam 507 on the first drive cam shaft 505 and the apex of the cam 507 on the second drive cam shaft 506 rotate to the same position (i.e., the critical point), the front-stage height adjustment component 100, the rear-stage height adjustment component 300, and the print height adjustment component 200 are pressed downward in the vertical direction relative to the front-stage drive roller 162, the rear-stage drive roller 172, and the print drive roller 142.

[0157] When the top point of the cam 507 on the first drive cam shaft 505 rotates downward and the top point of the cam 507 on the second drive cam shaft 506 rotates upward, the front end of the rear drive connecting plate 303 swings upward and the rear end swings downward, forcing the abutment plate 204 on the rear drive connecting plate 303 to move upward to lift the print head 141. At this time, the front-stage pressure roller 161 and the rear-stage pressure roller 171 press downward on the front-stage drive roller 162 and the rear-stage drive roller 172 in the vertical direction, and the print head 141 is lifted upward in the vertical direction by a set distance relative to the print drive roller 142.

[0158] The gear transmission assembly 500 comprises multiple gears (hereinafter referred to as the energy transmission gear assembly 501 and the first drive cam gear 502). The drive motor 508 transmits kinetic energy to the first drive cam gear 502 via the energy transmission gear assembly 501. A ferry gear 504 is provided at the rear end of the first drive cam gear 502. The first drive cam gear 502 is mounted on a rotating shaft (hereinafter referred to as the first drive cam rotating shaft 505). The first drive cam rotating shaft 505 is parallel to the rear drive shaft 512 and is disposed on the bottom surface of the rear drive connecting plate 303, in front of the rear drive shaft 512. At least one cam 507 is located in the middle of the bottom surface of each first drive cam rotating shaft 505, with the apexes of the cams 507 on the first drive cam rotating shaft 505 circumferentially spaced 180 degrees apart.

[0159] The energy transmission gear assembly 501 transmits kinetic energy to the drive cam gear 502, and the drive cam gear 502 drives the cam 507 provided on the drive cam shaft 505 to rotate. Since the apex of the cam 507 on the drive cam shaft 505 differs by 180 degrees in the circumferential direction, when it rotates, the front and rear ends of the rear drive connecting plate 303 can swing up and down (forming a seesaw phenomenon).

[0160] The biggest advantages of this improvement are:

[0161] 1) It can realize the integrated and orderly control of the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141, and the lifting height can be accurately controlled by the program.

[0162] 2) When using cam 507, its structural strength is higher, making the printer run more stable.

[0163] 3. Another improvement of this embodiment

[0164] like Figures 11 to 12 As shown, the front drive connecting plate 103 is mounted on the frame via the front drive shaft 511. The rear top surface of the front drive connecting plate 103 is located below the rear drive connecting plate 303. The rear side of the top surface of the front drive connecting plate 103 abuts against the front side of the bottom of the rear drive connecting plate 303. The front stage connecting rod 102 is connected between the rear side of the front stage pressure plate 101 and the front side of the front drive connecting plate 103. The rear stage connecting rod 302 is connected between the rear side of the rear stage pressure plate 301 and the rear side of the rear drive connecting plate 303.

[0165] The front-stage drive device, the rear-stage drive device, and the print drive top device share two cylinders, namely the front cylinder 509 and the rear cylinder 510. The front end of the piston rod of the front cylinder 509 abuts the front side of the rear-drive connecting plate 303, and the front end of the piston rod of the rear cylinder 510 abuts the rear side of the rear-drive connecting plate 303. The piston rod of the front cylinder 509 and the piston rod of the rear cylinder 510 move in opposite directions.

[0166] Through the alternating operation of the front cylinder 509 and the rear cylinder 510, the front-stage height adjustment component 100, the rear-stage height adjustment component 300 and the print height adjustment component 200 operate in the aforementioned manner, that is, the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 are lifted or pressed down relative to the front-stage drive roller 162, the rear-stage drive roller 172 and the print drive roller 142 respectively.

[0167] 4. Another improvement of this embodiment

[0168] The front drive connecting plate 103 is mounted on the frame via the front drive shaft 511. The rear top surface of the front drive connecting plate 103 is located below the rear drive connecting plate 303. The rear side of the top surface of the front drive connecting plate 103 abuts against the front side of the bottom of the rear drive connecting plate 303. The front stage connecting rod 102 is connected between the rear side of the front stage pressure plate 101 and the front side of the front drive connecting plate 103. The rear stage connecting rod 302 is connected between the rear side of the rear stage pressure plate 301 and the rear side of the rear drive connecting plate 303.

[0169] The front-stage driving device, the rear-stage driving device and the printing top driving device share a cylinder, and the front end of the cylinder piston rod abuts against the front side of the rear-stage driving connecting plate 303.

[0170] Through the cylinder, the front-stage height adjustment component 100, the rear-stage height adjustment component 300 and the print height adjustment component 200 work in the aforementioned manner, that is, the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 are lifted or pressed down relative to the front-stage drive roller 162, the rear-stage drive roller 172 and the print drive roller 142 respectively.

[0171] The biggest advantages of this improvement are:

[0172] 1) Fewer driving components and lower material costs;

[0173] 2) The lifting speed is fast when using a cylinder or electromagnetic suction component.

[0174] (II) Example 2

[0175] 1. Basic solution of this embodiment

[0176] The difference between this embodiment and embodiment 1 is that the front-stage height adjustment component 100 and the rear-stage height adjustment component 300 are different, the shape and structure of the abutment plate in the print height adjustment component 200 are different, and the other structures are basically the same (that is, the fixed side panels, bracket side panels and bracket top panels in embodiment 1 are basically the same).

[0177] 1) Pre-amplifier height adjustment component 100

[0178] like Figure 13 、 Figure 15 As shown, the front stage height adjustment assembly 100 is composed of a left lifting plate (hereinafter referred to as the front stage left lifting plate 106 ), a right lifting plate (hereinafter referred to as the front stage right lifting plate 107 ) and a front stage driving device.

[0179] The front left lifting plate 106 is composed of an upper part and a lower part of an integrated structure. The upper part is rectangular or elliptical, and is provided with an axial hole (hereinafter referred to as the pressure roller axial hole 108) in the upper part. The lower part is a support leg or is composed of a front support leg 402 and a rear support leg 403 arranged at intervals. In the present invention, the two support legs are preferably of the same length and are symmetrical with the central axis of the upper part.

[0180] The front-stage right lifting plate 107 has the same shape and structure as the front-stage left lifting plate, and is arranged parallel to the front-stage left lifting plate 106. The front-stage left lifting plate 106 and the front-stage right lifting plate 107 are respectively assembled on the inner sides of the front-stage left frame plate 109 (207, 308) and the front-stage right frame plate 110 (208, 309) arranged in the printer housing 12. Correspondingly, a pressure roller shaft hole 108 is provided on the upper part of the front-stage right lifting plate 107. The front-stage pressure roller 161 is installed across the two pressure roller shaft holes 108 on the front-stage left lifting plate 106 and the front-stage right lifting plate 107. The front-stage left lifting plate 106 or the front-stage right lifting plate 107 is connected to a driving device (hereinafter referred to as the front-stage driving device) through a transmission connecting member, which can make the front-stage left lifting plate 106 and the front-stage right lifting plate 107 rise or fall synchronously.

[0181] The front-stage left frame plate 109 (207, 308) and the front-stage right frame plate 110 (208, 309) are respectively arranged on the left and right sides of the front side of the printer housing 12, and the front-stage driving roller 162 is installed across the front-stage left frame plate 109 (207, 308) and the front-stage right frame plate 110 (208, 309). A vertical strip hole 401 is provided on the upper part of each frame plate, and the two ends of the roller shaft of the front-stage pressure roller 161 are placed in the vertical strip holes 401 on the corresponding sides, and a slide rail with an integral structure therewith is provided at the bottom of the two frame plates.

[0182] The transmission connection is composed of two sliding plates 413 (one end of the sliding plate 413 is connected to the driving device) mounted on the slide rail, which are parallel to each other and slide back and forth synchronously along the card transmission channel. They are respectively the front-stage left sliding plate and the front-stage right sliding plate. The top edge of each sliding plate 413 is a serrated structure. The support legs or the front support legs 402 and the rear support legs 403 are respectively placed in a corresponding tooth groove in the serrated structure and move between the bottom of the tooth groove and the top of the tooth as the sliding plate 413 slides back and forth. The front-stage left sliding plate and the front-stage right sliding plate are fixed together by a connecting rod. When the sliding plate 413 slides on the slide rail, the two sliding plates 413 move synchronously.

[0183] The front-stage driving device can be a stepping motor, a lead screw motor, a cylinder or an electromagnetic attraction component.

[0184] 2) Print height adjustment component 200

[0185] like Figure 13 、 Figure 15 As shown, the abutment plates in the print height adjustment assembly 200 are a print head left lifting plate (hereinafter referred to as the print level left lifting plate 205 ) and a print head right lifting plate (hereinafter referred to as the print level right lifting plate 206 ) installed at the bottom outside the print head housing 12 .

[0186] The left lifting plate 205 of the printing stage is composed of an upper part and a lower part of an integrated structure. The upper part is rectangular or elliptical, and the lower part is a support leg or is composed of a front support leg 402 and a rear support leg 403 set at intervals. In the present invention, the two support legs are preferably the same length and are symmetrical with the central axis of the upper part as the axis of symmetry.

[0187] The right printing level lifting plate 206 has the same shape and structure as the left printing level lifting plate 205. The left printing level lifting plate 205 and the right printing level lifting plate 206 are arranged in parallel. The left printing level lifting plate 205 and the right printing level lifting plate 206 are respectively assembled on the inner sides of the left printing level frame plate 207 (308, 109) and the right printing level frame plate 208 (309, 110) arranged in the printer housing 12. A corresponding shaft hole (hereinafter referred to as the print head shaft hole 209) is respectively provided on the left printing level lifting plate 205 and the right printing level lifting plate 206. The print head 141 is bridged and installed between the two print head shaft holes 209 through bearings (hereinafter referred to as the print head side shaft 210) arranged on its left and right sides. The left printing level lifting plate 205 or the right printing level lifting plate 206 is connected to a driving device (hereinafter referred to as the printing level driving device) through a transmission connecting member that can make the left printing level lifting plate 205 and the right printing level lifting plate 206 rise or fall synchronously.

[0188] The frame plates are respectively arranged on the left and right sides of the middle of the printer housing 12, and the print drive roller 142 is installed between the left frame plate 207 (308, 109) of the printing stage and the right frame plate 208 (309, 110) of the printing stage. A vertical strip hole 401 is respectively provided on the upper part of the two frame plates, and the end of the print head side shaft 210 is placed in the vertical strip hole 401 on the corresponding side. The bottom of the two frame plates is provided with a slide rail with an integral structure therewith.

[0189] The transmission connection parts are two sliding plates 413 (one end of the sliding plate 413 is connected to the driving device) mounted on the slide rail, which are parallel to each other and slide back and forth synchronously along the card transmission channel. They are the left sliding plate of the printing level and the right sliding plate of the printing level. The top edge of each sliding plate 413 is a serrated structure. The front support leg 402 and the rear support leg 403 are respectively placed in a corresponding tooth groove in the serrated structure and move between the bottom of the tooth groove and the top of the tooth as the sliding plate 413 slides back and forth.

[0190] The printing stage driving device can be a stepping motor, a screw motor or a cylinder.

[0191] 3) Post-stage height adjustment component 300

[0192] like Figure 13 、 Figure 15 As shown, the rear stage height adjustment assembly 300 is composed of a left lifting plate (hereinafter referred to as the rear stage left lifting plate 306 ), a right lifting plate (hereinafter referred to as the rear stage right lifting plate 307 ) and a rear stage driving device.

[0193] The shape and structure of the rear-stage left lift plate 306 and the rear-stage right lift plate 307 are the same as those of the front-stage left lift plate, and they also have a rectangular or elliptical upper portion and a support foot or a front support foot 402 and a rear support foot 403 provided at the lower portion. The rear-stage left lift plate 306 and the rear-stage right lift plate 307 are arranged in parallel and are respectively assembled on the inner sides of the rear-stage left frame plate 308 (207, 109) and the rear-stage right frame plate 309 (208, 110) provided in the printer housing 12. A corresponding pressure roller shaft hole 108 is provided on each of the rear-stage left lift plate 306 and the rear-stage right lift plate 307, and the rear-stage pressure roller 171 is installed across the two pressure roller shaft holes 108. The rear-stage left lifting plate 306 or the rear-stage right lifting plate 307 is connected to a driving device (hereinafter referred to as the rear-stage driving device) through a transmission connection piece, which can make the rear-stage left lifting plate 306 and the rear-stage right lifting plate 307 rise or fall synchronously.

[0194] The rear-stage left frame plate 308 (207, 109) and the rear-stage right frame plate 309 (208, 110) are respectively arranged on the left and right sides of the rear side of the printer housing 12, and the rear-stage driving roller 172 is installed across the two frame plates. A vertical strip hole 401 is provided on the upper part of each frame plate, and the two ends of the roller shaft of the rear-stage pressure roller 171 are placed in the vertical strip holes 401 on the corresponding sides. A slide rail with an integral structure therewith is provided at the bottom of the two frame plates.

[0195] The transmission connection parts are two sliding plates 413 (one end of the sliding plate 413 is connected to the driving device) mounted on the slide rail, which are parallel to each other and slide back and forth synchronously along the card transmission channel. They are respectively the rear-stage left sliding plate and the rear-stage right sliding plate. The top edge of each sliding plate 413 is a serrated structure. The support legs or the front support legs 402 and the rear support legs 403 are respectively placed in a corresponding tooth groove in the serrated structure and move between the bottom of the tooth groove and the top of the tooth as the sliding plate 413 slides back and forth.

[0196] The front-stage driving device can be a stepping motor, a lead screw motor, a cylinder or an electromagnetic attraction component.

[0197] 2. Further Improvements of This Example

[0198] like Figure 13 、 Figure 14 、 Figures 16 to 20 As shown, the sliding plate 413 in the front-stage height adjustment component 100, the printing height adjustment component 200 and the rear-stage height adjustment component 300 is an integrated structure, and its length is preferably greater than the distance between the front-stage pressure roller 161 and the rear-stage pressure roller 171. It is fixed together on both sides of the sliding plate 413 by connecting rods. The front-stage drive device, the rear-stage drive device and the printing-stage drive device can be a motor arranged on one side of the sliding plate 413 and can drive the sliding plate 413 to move back and forth in a straight line.

[0199] In this embodiment, the front-stage left lifting plate 106, the front-stage right lifting plate 107, the rear-stage left lifting plate 306, the rear-stage right lifting plate 307, the printing stage lifting plate 205, and the printing stage right lifting plate 206 have the same shape and structure (their lengths in the vertical direction may be different). In the sawtooth structure, the direction of the sawteeth corresponding to the front-stage lifting plates (including the front-stage left lifting plate 106 and the front-stage right lifting plate 107) is the same as the direction of the sawteeth corresponding to the rear-stage lifting plates (including the rear-stage left lifting plate 306 and the rear-stage right lifting plate 307). The direction of the saw teeth corresponding to the front-stage lifting plate is opposite to the direction of the saw teeth corresponding to the printing level lifting plate (including the printing level lifting plate 205 and the printing level right lifting plate 206); when the support feet or the front support feet 402 and the rear support feet 403 on the front-stage lifting plate and the rear-stage lifting plate fall into the bottom of the corresponding tooth groove, the support feet or the front support feet 402 and the rear support feet 403 on the printing level lifting plate fall at the tooth top of the corresponding tooth groove, and the spacing between the support feet or the front support feet 402 and the rear support feet 403 of the front-stage lifting plate is the same as the tooth pitch of the saw teeth in the corresponding sawtooth structure.

[0200] 3. Working status of the height adjustment component of this embodiment

[0201] like Figure 20 As shown, when the supporting feet of the front-stage left lifting plate 106, the front-stage right lifting plate 107, the rear-stage left lifting plate 306, and the rear-stage right lifting plate 307 or the front supporting feet 402 and the rear supporting feet 403 are at the bottom of the tooth groove, the supporting feet of the printing-stage lifting plate 205 and the printing-stage right lifting plate 206 or the front supporting feet 402 and the rear supporting feet 403 are at the top of the tooth groove. At this time, the front-stage pressure roller 161 and the rear-stage pressure roller 171 are respectively pressed on the front-stage drive roller 162 and the rear-stage drive roller 172, and the print head 141 is lifted upward by a set distance relative to the print drive roller 142 in the vertical direction.

[0202] like Figure 19 As shown, when the supporting feet or the front supporting feet 402 and the rear supporting feet 403 of the front-stage left lifting plate 106, the front-stage right lifting plate 107, the rear-stage left lifting plate 306, and the rear-stage right lifting plate 307 are in the middle position of the tooth groove (i.e., the critical point), the supporting feet or the front supporting feet 402 and the rear supporting feet 403 of the printing stage lifting plate 205 and the printing stage right lifting plate 206 are also in the middle position of the tooth groove (i.e., the critical point). At this time, the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 are respectively pressed on the front-stage drive roller 162, the rear-stage drive roller 172 and the print drive roller 142 at the same time.

[0203] like Figure 18As shown, when the supporting feet or the front supporting feet 402 and the rear supporting feet 403 of the front-stage left lifting plate 106, the front-stage right lifting plate 107, the rear-stage left lifting plate 306, and the rear-stage right lifting plate 307 are at the top of the teeth, the supporting feet or the front supporting feet 402 and the rear supporting feet 403 of the printing stage lifting plate 205 and the printing stage right lifting plate 206 are at the bottom of the teeth. At this time, the front-stage pressure roller 161 and the rear-stage pressure roller 171 are lifted upward by a set distance relative to the front-stage drive roller 162 and the rear-stage drive roller 172 in the vertical direction, and the print head 141 is pressed against the print drive roller 142.

[0204] The technical solution of this embodiment has the following advantages:

[0205] 1) It has a simple structure and uses low material costs.

[0206] (III) Example 3

[0207] The difference between this embodiment and embodiment 1 is that the front-stage height adjustment component 100 and the rear-stage height adjustment component 300 are different, the shape and structure of the abutment plate in the print height adjustment component 200 are different, and the other structures are basically the same (that is, the fixed side panels, bracket side panels and bracket top panels in embodiment 1 are basically the same).

[0208] 1) Pre-amplifier height adjustment component 100

[0209] like Figure 21 As shown, the front stage height adjustment assembly 100 is composed of a left horizontal plate (hereinafter referred to as the front stage left horizontal plate 111) and a right connecting rod (hereinafter referred to as the front stage right connecting rod 112).

[0210] The front left horizontal plate 111 is in the shape of a long strip and is fixed on the horizontally arranged left base plate 408. A shaft hole for installing the rotating shaft is provided at the front end.

[0211] The front stage right connecting rod 112 is preferably in the shape of an inverted "L", and is divided into a vertical plate portion 404 and a horizontal plate portion 405. The horizontal plate portion 405 is parallel to the front stage left horizontal plate 111. The front stage pressure roller 161 is installed in a bridging manner between the front stage left horizontal plate 111 and the horizontal plate portion 405 and is located directly above the front stage driving roller 162. The two ends of the front-stage driving roller 162 are respectively fixed on the left base plate 408 and the right base plate (not shown in the figure). An axial hole is provided on the horizontal plate portion 405 at a position corresponding to the axial hole on the front-stage left horizontal plate 111. A rotating shaft is provided between the two axial holes. The left end of the rotating shaft passes through the corresponding axial hole and is fixedly or rotatably connected to the left base plate 408. The front-stage pressure roller 161 is forced to rise or fall as the front-stage right connecting rod 112 rotates forward or reverse. The front-stage left horizontal plate 111 rotates synchronously with the front-stage right connecting rod 112. The horizontal plate portion 405 and the front-stage left horizontal plate 111 are relatively fixed. The preferred fixing methods are as follows:

[0212] a. A crossbeam plate 406 is provided on the side of the front-stage pressure roller 161 to connect the front-stage left cross plate 111 and the cross plate portion 405 together.

[0213] b. The ends of the shaft are D-shaped, and D-shaped holes are provided on the horizontal plate portion 405 and the corresponding positions of the front left horizontal plate 111. The shaft is inserted into the D-shaped hole so that the shaft and the horizontal plate portion 405 and the front left horizontal plate 111 are relatively fixed in the circumferential direction of the shaft.

[0214] c. Threaded holes are radially provided at both ends of the shaft. Threaded holes are provided on the transverse plate portion 405 and the front left transverse plate 111 respectively. The transverse plate portion 405 and the front left transverse plate 111 are fixedly connected to both ends of the shaft by screws.

[0215] d. The ends of the shaft are interference fit with the holes on the horizontal plate portion 405 and the left horizontal plate 111 of the previous stage.

[0216] f. Weld or glue the ends of the shaft to the horizontal plate portion 405 and the front left horizontal plate 111.

[0217] g. Circular holes are radially provided at both ends of the shaft, and the horizontal plate portion 405 and the front left horizontal plate 111 are provided with corresponding circular holes. The horizontal plate portion 405 and the front left horizontal plate 111 are respectively connected and fixed to both ends of the shaft by elastic cylindrical pins.

[0218] h. Industrial key slots are respectively provided at both ends of the rotating shaft and the transverse plate portion 405 and the front left transverse plate 111, which are connected by keys so that the two ends of the rotating shaft and the transverse plate portion 405 and the front left transverse plate 111 are circumferentially fixed, and industrial retaining spring slots are provided at both ends of the industrial key slot of the rotating shaft to achieve axial fixation through the retaining springs.

[0219] A front-stage driving device is connected below the vertical plate portion 404 and is capable of driving the front-stage right connecting rod 112 to rotate around the axis of the rotating shaft.

[0220] The front-stage driving device can be a screw motor, a stepping motor, a cylinder or an electromagnetic attraction component.

[0221] 2) Print height adjustment component 200

[0222] like Figure 21 As shown, the abutment plate in the print height adjustment assembly 200 can be replaced by a slider (hereinafter referred to as the print level slider 211 ), a slide rail (hereinafter referred to as the print level slide rail 212 ) and a right connecting rod (hereinafter referred to as the print level right connecting rod 213 ).

[0223] The printing level slider 211 is fixedly connected to the left side of the print head 141. Correspondingly, the printing level slide rail 212 is fixed on the vertically arranged left base plate 408. The printing level slider 211 can move up and down on the slide rail.

[0224] The shape of the printing level right connecting rod 213 is preferably set in the following two ways:

[0225] The first type is that the shape of the printing level right connecting rod 213 is preferably an inverted "L" shape, which is divided into a vertical plate portion 404 and a horizontal plate portion.

[0226] 405 , the horizontal plate portion 405 is fixedly connected to the right side of the print head 141 , the vertical plate portion 404 extends downward, and the print drive connecting plate is arranged at the lower end of the vertical plate portion 404 .

[0227] The second type of printing level right rod 213 can also be a vertical plate extending vertically downward with an integral structure, and its upper end is fixed

[0228] On the right side of the print head 141.

[0229] The present invention is preferably the first type. A printing stage driving device is connected below the printing stage right connecting rod 213 and can drive the printing stage right connecting rod 213 and the print head 141 to move up and down along the printing stage slide rail 212.

[0230] The printing stage driving device can be a screw motor, a stepping motor, a cylinder or an electromagnetic attraction component.

[0231] 3) Post-stage height adjustment component 300

[0232] like Figure 19 As shown, the rear stage height adjustment assembly 300 is composed of a left horizontal plate (hereinafter referred to as the rear stage left horizontal plate 310 ) and a right connecting rod (hereinafter referred to as the rear stage right connecting rod 311 ) connecting plate.

[0233] The rear left horizontal plate 310 is in the shape of a long strip, fixed on the horizontally arranged left base plate 408, and has a front end for mounting.

[0234] Axis hole for installing the rotating shaft.

[0235] The rear stage right connecting rod 311 is preferably in the shape of an inverted "L", and is divided into a vertical plate portion 404 and a horizontal plate portion 405. The horizontal plate portion 405 is parallel to the rear stage left horizontal plate 310. The rear stage pressure roller 171 is installed in a bridging manner between the rear stage left horizontal plate 310 and the horizontal plate portion 405 and is located directly above the rear stage driving roller 172. The two ends of the rear stage driving roller 172 are respectively installed on the left base plate 408 and the right base plate (not shown in the figure). An axis hole is provided at a position corresponding to the axis hole on the left transverse plate 310, and a rotating shaft is provided between the two axis holes. The left end of the rotating shaft passes through the corresponding axis hole and is fixed or rotatably connected to the horizontally arranged left base plate 408. The rear-stage pressure roller 171 is forced to rise or fall as the rear-stage right connecting plate 314 rotates forward or reverse. The rear-stage left transverse plate 310 rotates synchronously with the rear-stage right connecting rod 311. The transverse plate portion 405 and the rear-stage left transverse plate 310 are relatively fixed. The fixing method is preferably as follows:

[0236] a. A beam plate 406 is provided on the side of the rear stage pressure roller 171 to connect the rear stage left horizontal plate 310 and the horizontal plate portion 405 together.

[0237] b. The shaft is D-shaped at both ends. D-shaped holes are provided on the horizontal plate portion 405 and the corresponding position of the rear left horizontal plate. The shaft is inserted into the D-shaped hole so that the shaft and the horizontal plate portion 405 and the rear left horizontal plate 310 are relatively fixed in the circumferential direction of the shaft.

[0238] c. Threaded holes are radially provided at both ends of the shaft. Threaded holes are provided on the horizontal plate portion 405 and the rear left horizontal plate 310 respectively. The horizontal plate portion 405 and the rear left horizontal plate 310 are fixedly connected to both ends of the shaft by screws.

[0239] d. The ends of the shaft are interference fit with the holes on the horizontal plate portion 405 and the rear left horizontal plate 310.

[0240] f. Weld or glue the ends of the shaft to the horizontal plate portion 405 and the rear left horizontal plate 310.

[0241] g. Circular holes are radially provided at both ends of the shaft, and the horizontal plate portion 405 and the rear left horizontal plate 310 are provided with corresponding circular holes. The horizontal plate portion 405 and the rear left horizontal plate 310 are respectively connected and fixed to both ends of the shaft by elastic cylindrical pins.

[0242] h. Industrial key slots are respectively provided at both ends of the rotating shaft and the transverse plate portion 405 and the rear-stage left transverse plate 310, which are connected by keys so that the two ends of the rotating shaft and the transverse plate portion 405 and the rear-stage left transverse plate 310 are circumferentially fixed. At the same time, industrial retaining spring slots are provided at both ends of the industrial key slots of the rotating shaft to achieve axial fixation through retaining springs.

[0243] A rear-stage driving device is connected below the lower end of the vertical plate portion 404 and is capable of driving the rear-stage right connecting rod 311 to rotate around the axis of the rotating shaft.

[0244] The subsequent driving device may be a screw motor, a stepping motor, a cylinder or an electromagnetic attraction component.

[0245] 4) Working status of the height adjustment component of this embodiment

[0246] Under the control of the main control circuit, the front-stage driving device, the rear-stage driving device and the printing-stage driving device respectively drive the front-stage right connecting rod 112, the rear-stage right connecting rod 311 and the printing-stage right connecting rod 213 to raise the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 by a set distance in the vertical direction relative to the front-stage driving roller 162, the rear-stage driving roller 172 and the printing driving roller 142.

[0247] The technical solution of this implementation has the following advantages:

[0248] 1) Simple structure and low material cost.

[0249] (IV) Example 4

[0250] 1. Basic solution of this embodiment

[0251] The difference between this embodiment and embodiment 1 is that the front-stage height adjustment component 100 and the rear-stage height adjustment component 300 are different, the shape and structure of the abutment plate in the print height adjustment component 200 are different, and the other structures are basically the same (that is, the fixed side panels, bracket side panels and bracket top panels in embodiment 1 are basically the same).

[0252] 1) Pre-amplifier height adjustment component 100

[0253] like Figure 26 As shown, the front-stage height adjustment assembly 100 is composed of a slider plate (hereinafter referred to as the front-stage slider plate 113 ), a slide rail (hereinafter referred to as the front-stage slide rail 114 ) and a right connecting plate (hereinafter referred to as the front-stage right connecting plate 115 ).

[0254] The front-stage slide rail 114 is fixed on the left base plate 408 arranged in the transverse direction. The front-stage slider plate 113 can carry the front-stage pressure roller 161 to move up and down on the front-stage slide rail 114 .

[0255] The front-stage slider plate 113 is parallel to the front-stage right connecting plate 115. The front-stage pressure roller 161 is assembled between the front-stage slider plate 113 and the front-stage right connecting plate 115 and is located directly above the front-stage driving roller 162. The two ends of the front-stage driving roller 162 are respectively fixed on the left base plate 408 and the right base plate (not shown in the figure).

[0256] The front-stage right connecting plate 115 is a long strip, and a front-stage driving device is connected below the front-stage right connecting plate to drive the front-stage right connecting plate 115 and the front-stage pressing roller 161 to move up and down along the front-stage slide rail 114 .

[0257] The front-stage driving device includes a screw motor, a stepping motor, an electromagnetic attraction component and a cylinder.

[0258] 2) Print height adjustment component 200

[0259] like Figure 26 As shown, the abutment plate in the print height adjustment assembly 200 is replaced by a slider (hereinafter referred to as the print level slider 211 ), a slide rail (hereinafter referred to as the print level slide rail 212 ) and a right connecting rod (print level right connecting rod 213 ).

[0260] The printing level slider 211 is fixedly connected to the left side of the print head 141 . Correspondingly, the printing level rail 212 is fixed on the vertically arranged left base plate 408 . The printing level slider 211 carries the print head 141 and moves up and down on the printing level rail 212 .

[0261] The shape of the printing level right connecting rod 213 is preferably set in two ways as follows:

[0262] The first type is that the shape of the right link 213 of the printing level is an inverted "L" shape, which is divided into a vertical plate portion 404 and a horizontal plate portion 405. The horizontal plate portion 405 is fixed to the right side of the print head 141, and the vertical plate portion 404 extends downward. The print head 141 is assembled between the horizontal plate portion 405 and the printing level slider 211 and is located directly above the printing drive roller 142. The two ends of the printing drive roller 142 are respectively installed on the left base plate 408 and the right base plate (not shown in the figure).

[0263] The second type is that the shape of the printing level right connecting rod 213 is a vertical plate extending vertically downward with an integrated structure, and its upper end is fixed to the right side of the print head 141. The print head 141 is assembled between the upper end of the printing level right connecting rod 213 and the printing level slider 211 and is located directly above the printing drive roller 142. The two ends of the printing drive roller 142 are respectively mounted on the left base plate 408 and the right base plate (not shown in the figure).

[0264] The present invention is preferably the first type, wherein a printing stage driving device is provided under the vertical plate portion 404 of the integral structure of the printing stage right connecting rod 213 , which can drive the printing stage right connecting rod 213 and the print head 141 to move up and down along the printing stage slide rail 212 .

[0265] The printing stage driving device can be a screw motor, a stepping motor, an electromagnetic attraction component or a cylinder.

[0266] 3) Post-stage height adjustment component 300

[0267] like Figure 24 As shown, the rear stage height adjustment assembly 300 is composed of a slider plate (hereinafter referred to as the rear stage slider plate 312 ), a slide rail (hereinafter referred to as the rear stage slide rail 313 ) and a right connecting plate (hereinafter referred to as the rear stage right connecting plate 314 ).

[0268] The rear-front slide rail 313 is fixed on the horizontally arranged left base plate 408 , and the rear-stage slider plate 312 carrying the rear-stage pressure roller 171 can move up and down on the rear-stage slide rail 313 .

[0269] The rear-stage slider plate 312 is parallel to the rear-stage right connecting plate 314 . The rear-stage pressure roller 171 is assembled between the rear-stage slider plate 312 and the rear-stage right connecting plate 314 and is located directly above the rear-stage driving roller 172 .

[0270] The rear-stage right connecting rod 314 is long, and a rear-stage driving device is connected below the rear-stage right connecting rod 314 to drive the rear-stage right connecting plate 314 and the rear-stage pressure roller 114 to move up and down along the rear-stage slide rail 313.

[0271] The subsequent driving device is a screw motor, a stepping motor, an electromagnetic attraction component or a cylinder.

[0272] Working state of the height adjustment component in this embodiment

[0273] Under the control of the main control circuit, the front-stage drive device, the rear-stage drive device and the printing-stage drive device respectively drive the front-stage slider plate 113, the rear-stage slider plate 312 and the printing-stage right connecting rod 213 to lift the front-stage pressure roller 161, the rear-stage pressure roller 171 and the front-stage drive roller 162 and the rear-stage drive roller 172 of the print head 141 upward by a set distance in the vertical direction relative to the front-stage drive roller 162, the rear-stage drive roller 172 and the printing drive roller 142.

[0274] A further improvement of the present invention is: Figures 22 to 25 As shown, the aforementioned front-stage driving device and rear-stage driving device use the same driving device, and the rear-stage height adjustment component 300 is the rear-stage right connecting plate 314 .

[0275] The rear-stage pressure roller 171 is assembled between the left base plate and the rear-stage right connecting plate 314. The rear-stage right connecting plate 314 is fixedly connected to the front-stage right connecting plate 115 through a connecting plate (hereinafter referred to as the right connecting plate 417). The front-stage driving device carries the front-stage pressure roller 161 and the rear-stage pressure roller 171 up and down along the front-stage slide rail 114 through the front-stage right connecting plate 115, the right connecting plate 417 and the rear-stage right connecting plate 314.

[0276] The subsequent driving device is a screw motor, a stepping motor, an electromagnetic attraction component or a cylinder.

[0277] The technical solution of this embodiment has the following advantages:

[0278] 1) Accurately control the distances between the front-stage pressure roller 161, the rear-stage pressure roller 171, and the print head 141;

[0279] 2) The printer makes little noise when in motion.

[0280] (V) Example 5

[0281] The difference between this embodiment and embodiment 1 is that the front-stage height adjustment component 100 and the rear-stage height adjustment component 300 are different, the shape and structure of the abutment plate in the print height adjustment component 200 are different, and the other structures are basically the same (that is, the fixed side panels, bracket side panels and bracket top panels in embodiment 1 are basically the same).

[0282] 1. Basic solution of this embodiment

[0283] 1) Pre-amplifier height adjustment component 100

[0284] like Figure 27As shown, the front-stage height adjustment assembly 100 is composed of a slider plate (hereinafter referred to as the front-stage slider plate 113 ), a slide rail (hereinafter referred to as the front-stage slide rail 114 ), a right connecting plate (hereinafter referred to as the front-stage right connecting plate 115 ), and a synchronous belt 407 .

[0285] The front-stage slide rail 114 is fixed on the left base plate 408 arranged in the transverse direction. The front-stage slider plate 113 can carry the front-stage pressure roller 161 to move up and down on the front-stage slide rail 114 .

[0286] The front-stage slider plate 113 and the front-stage right connecting plate 115 are parallel to each other. The front-stage pressure roller 161 is assembled between the front-stage slider plate 113 and the front-stage right connecting plate 115 and is located directly above the front-stage driving roller 162 .

[0287] A vertical strip hole 401 is provided on the front side of the right substrate, and the right roller shaft of the front-stage driving roller 162 can pass through the strip hole. The right substrate is provided with a front-stage driving device, and two synchronous wheels 409 are respectively installed at both ends of the front side of the right substrate, and the synchronous belt 407 is placed between the two synchronous wheels 409.

[0288] A fastening connector 410 is provided on the synchronous belt 407 and can be fixedly connected to the front-stage right connecting plate 115. The provision of the fastening connector 410 can prevent the synchronous belt 407 from deviating during rotation. As the synchronous belt 407 rotates forward or reverse, the front-stage right connecting plate 115 carries the front-stage pressure roller 161 and moves up and down along the front-stage slide rail 114.

[0289] The front-stage driving device can be a DC motor or a stepping motor.

[0290] 2) Print height adjustment component 200

[0291] like Figure 27 As shown, the abutment plate in the print height adjustment assembly 200 is replaced by a slider (hereinafter referred to as the printing level slider 211 ), a slide rail (hereinafter referred to as the printing level slide rail 212 ), a right connecting plate (hereinafter referred to as the printing level right connecting rod 213 ), and a synchronous belt 407 .

[0292] The printing level slider 211 is fixedly connected to the left side of the print head 141. Correspondingly, the printing level slide rail 212 is fixed on the vertically arranged left base plate 408. The printing level slider 211 carrying the print head 141 can move up and down on the slide rail.

[0293] The printing level right connecting rod 213 is fixed to the right side of the print head 141. The print head 141 is assembled between the printing level slider 211 and the printing level right connecting rod 213 and is located above the printing drive roller 142. The left end of the printing drive roller 142 is fixed to the left base plate 408.

[0294] A vertical strip hole 401 is provided in the middle of the right base plate, and the right roller shaft of the print drive roller 142 passes through the vertical strip hole 401. A printing level driving device is provided at the lower part of the right base plate, and two synchronous wheels 409 are respectively installed at the upper and lower ends of the right base plate. A synchronous belt 407 is sleeved between the two synchronous wheels 409. A fastening connector 410 that can be fixed to the printing level right connecting rod 213 is provided on the synchronous belt 407. The fastening connector 410 can prevent the synchronous belt 407 from deviating during rotation. As the synchronous belt 407 rotates forward or reverse, the printing level right connecting rod 213 carries the print head 141 up and down along the printing level slide rail 212.

[0295] The printing stage driving device can be a DC motor or a stepping motor.

[0296] 3) Post-stage height adjustment component 300

[0297] like Figure 25 As shown, the rear stage height adjustment assembly 300 is composed of a slider plate (hereinafter referred to as the rear stage slider plate 312 ), a slide rail (hereinafter referred to as the rear stage slide rail 313 ), a right connecting plate (hereinafter referred to as the rear stage right connecting plate 314 ), and a synchronous belt 407 .

[0298] The rear-stage slide rail 313 is fixed on the left base plate 408 arranged laterally, and the slider plate can move up and down on the rear-stage slide rail 313.

[0299] The rear-stage slider plate 312 is parallel to the rear-stage right connecting plate 314 , and the rear-stage pressure roller 171 is assembled between the rear-stage slider plate 312 and the rear-stage right connecting plate 314 and directly above the rear-stage driving roller 172 . The left end of the rear-stage driving roller 172 is fixed on the left base plate 408 .

[0300] The rear-stage right connecting plate 314 is a long strip plate.

[0301] A vertical strip hole 401 is provided on the rear side of the right base plate, and the right roller shaft of the rear-stage driving roller 172 passes through the strip hole. The right base plate is provided with a rear-stage driving device, and two synchronous wheels 409 are respectively installed at both ends of the right base plate, and the synchronous belt 407 is placed between the two synchronous wheels 409.

[0302] A fastening connector 410 is provided on the synchronous belt 407 and can be fixedly connected to the rear-stage right connecting plate 314. The provision of the fastening connector 410 can prevent the synchronous belt 407 from deviating during rotation. As the synchronous belt 407 rotates forward or reverse, the rear-stage right connecting plate 314 carries the rear-stage pressure roller 171 and moves up and down along the rear-stage slide rail 313.

[0303] The latter driving device may be a DC motor or a stepping motor.

[0304] 4) Working status of the height adjustment component of this embodiment

[0305] Under the control of the main control circuit, the front-stage drive device, the rear-stage drive device and the printing-stage drive device respectively drive the synchronous belt 407 on the corresponding synchronous wheel. As the synchronous belt 407 rotates, the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 are raised by a set distance in the vertical direction relative to the front-stage drive roller 162, the rear-stage drive roller 172 and the printing drive roller 142 respectively.

[0306] Under the control of the main control circuit, the front-stage driving device, the rear-stage driving device and the printing-stage driving device respectively drive the front-stage right connecting rod 112, the rear-stage right connecting rod 311 and the printing-stage right connecting rod 213 to raise the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 by a set distance in the vertical direction relative to the front-stage driving roller 162, the rear-stage driving roller 172 and the printing driving roller 142.

[0307] 2. A further improvement of this embodiment is: Figures 28 to 29 As shown, the aforementioned rear-stage height adjustment component 300 and the front-stage height adjustment component 100 use the same drive device, which is the rear-stage right connecting plate 314. The rear-stage pressure roller 171 is assembled between the left base plate 408 and the rear-stage right connecting plate 314 and is located above the rear-stage drive roller 172. The left end of the rear-stage drive roller 172 is fixed to the left base plate 408.

[0308] The connecting plate (hereinafter referred to as the right connecting plate 417) is a long strip, and the rear-stage right connecting plate 314 is fixedly connected to the front-stage right connecting plate 115 through the connecting plate. The front-stage driving device can move up and down along the front-stage slide rail 114 with the front-stage pressure roller 161 and the rear-stage pressure roller 171 through the synchronous wheel 409, the synchronous belt 407, the front-stage right connecting plate 115, the right connecting plate 417 and the rear-stage right connecting plate 314.

[0309] The technical solution of this embodiment has the following advantages:

[0310] 1) When the synchronous belt 407 needs to be replaced, it can be easily disassembled and installed;

[0311] 2) Since the timing belt 407 is slightly elastic, it has a buffering and vibration-reducing effect during the operation of the printer or when the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 are lifted, making the printer move more smoothly.

Claims

1. A card printer, comprising a front-stage pressure roller assembly (16) arranged at the front side of a print head assembly (14) for rolling a card forward, the front-stage pressure roller assembly (16) comprising a front-stage pressure roller (161) and a front-stage driving roller (162) installed in the printer in an up-down stacked manner, the front-stage pressure roller (161) being raised vertically by a set distance relative to the front-stage driving roller (162) by a front-stage height adjustment assembly (100) which automatically adjusts the height, when the card moves near the front-stage pressure roller (161) and before the front end of the card touches the front-stage pressure roller (161) and / or when the rear end of the card is about to leave the front-stage pressure roller (161) pressing against it; The print head (141) in the print head assembly (14) is raised vertically by a set distance relative to the print drive roller (142) by an automatically height-adjustable print height adjustment assembly (200) when the card is adjacent to the print head (141) and before the front end of the card touches the print head (141); A rear-stage counter-pressing roller assembly (17) for rolling the card forward is provided on the rear side of the print head assembly (14), the rear-stage counter-pressing roller assembly (17) being composed of a rear-stage counter-pressing roller (171) and a rear-stage driving roller (172) installed in the printer in an up-down stacked manner, the rear-stage counter-pressing roller (171) being raised vertically by a set distance relative to the rear-stage driving roller (172) by a rear-stage height adjustment assembly (300) that automatically adjusts the height when the card moves near the rear-stage counter-pressing roller (171) and before the front end of the card touches the rear-stage counter-pressing roller (171); It is characterized by: The front-stage height adjustment component (100) comprises a front-stage slider plate (113), a front-stage slide rail (114), a front-stage right connecting plate (115) and a synchronous belt (407), the front-stage slide rail (114) is fixed on a vertically arranged left base plate (408), the front-stage slider plate (113) and the front-stage right connecting plate (115) are parallel to each other, the front-stage pressure roller (161) is assembled between the front-stage slider plate (113) and the front-stage right connecting plate (115), two synchronous wheels (409) are installed on the right base plate, the synchronous belt (407) is sleeved between the two synchronous wheels (409), and a fastening connector (410) that can be fixedly connected to the front-stage right connecting plate (115) is provided on the synchronous belt (407), and as the synchronous belt (407) rotates forward or reverse, the front-stage right connecting plate (115) carries the front-stage pressure roller (161) and moves up and down along the front-stage slide rail (114).

2. The card printer according to claim 1, wherein: The printing height adjustment component (200) includes a printing level slider (211), a printing level slide rail (212), a printing level right connecting rod (213) and a synchronous belt (407), wherein the printing level slider (211) is fixed on the left side of the printing head (141), the printing level slide rail (212) is fixed on the left base plate (408), the printing level right connecting rod (213) is fixed on the right side of the printing head (141), two synchronous wheels (409) are installed on the right base plate, the synchronous belt (407) is sleeved between the two synchronous wheels (409), and a fastening connector (410) that can be fixed to the printing level right connecting rod (213) is provided on the synchronous belt (407), and as the synchronous belt (407) rotates forward or reverse, the printing level right connecting rod (213) carries the printing head (141) and moves up and down along the printing level slide rail (212).

3. The card printer according to claim 1, wherein: The rear-stage height adjustment component (300) includes a rear-stage slider plate (312), a rear-stage slide rail (313), a rear-stage right connecting plate (314) and a synchronous belt (407). The rear-stage slide rail (313) is fixed on a vertically arranged left base plate (408). The rear-stage slider plate (312) and the rear-stage right connecting plate (314) are parallel to each other. The rear-stage pressure roller (171) is assembled between the rear-stage slider plate (312) and the rear-stage right connecting plate (314). Two synchronous wheels (409) are installed on the right base plate. The synchronous belt (407) is sleeved between the two synchronous wheels (409). A fastening connector (410) that can be fixed to the rear-stage right connecting plate is provided on the synchronous belt (407). As the synchronous belt (407) rotates forward or reverse, the rear-stage right connecting plate (314) carries the rear-stage pressure roller (171) and moves up and down along the rear-stage slide rail (313).

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