Card printer

Abstract

A card printer with high printing precision, uniform card feeding speed and suitable for printing thicker cards. It comprises a front-stage pair of compression roller assembly arranged in front of the printing head assembly, or a front-stage pair of compression roller assembly and a rear-stage pair of compression roller assembly arranged behind the printing head assembly. The front-stage pair of compression roller assembly is composed of a front-stage compression roller and a front-stage driving roller stacked vertically in the printer. The rear-stage pair of compression roller assembly is composed of a rear-stage compression roller and a rear-stage driving roller stacked vertically in the printer. The front-stage compression roller is raised vertically upward by a front-stage height adjustment assembly to a certain height when the card is near the front-stage compression roller and before the front end of the card touches the front-stage compression roller and / or when the rear end of the card is about to leave the two positions where the front-stage compression roller presses the card. It is suitable for printing thicker cards, and the feeding speed is uniform, which prevents the position of the printed content from being offset and prevents the printing precision from being reduced.

Description

[0001] This application is a divisional application of the patent application filed on March 7, 2022, with application number 202210216051.2 and invention title "Card Printer". Technical Field

[0002] This invention relates to thermal transfer printers, and more particularly to a card printer that ensures the printing medium is transferred at a uniform speed. Background Technology

[0003] The card feed channel of the card printer, from the inlet of the card to be printed (hereinafter referred to as blank card) to the outlet of the card with printed content (hereinafter referred to as loaded card), includes the following parts in sequence: card compartment, width adjustment component, front pressure roller assembly, card position detection device, print head assembly and rear pressure roller assembly (the direction of the blank card inlet is front, and the direction of the loaded card outlet is rear, the same below).

[0004] The card compartment is a compartment used to hold blank cards. Usually, several blank cards of the same type are placed in the card compartment in a stacked manner before printing. The card compartment area is also equipped with a card drive roller assembly to push the blank cards out of the card compartment.

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

[0006] The front pressure roller assembly is located before the printhead assembly. It consists of a front pressure roller and a front drive roller arranged vertically. The front pressure roller presses the blank card that moves below it against the front drive roller to increase the friction between the card and the front drive roller, thereby effectively preventing the front drive roller from slipping when it moves the blank card.

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

[0008] The printhead assembly includes a printhead mounted on a print holder and a print drive roller mounted on a transport channel frame. During printing, the printhead moves down and presses a blank card against the print drive roller, which then rolls the card forward at a set speed.

[0009] The rear pressure roller assembly is basically the same in structure as the front pressure roller assembly. It is located after the printhead assembly and consists of a rear pressure roller and a rear drive roller arranged vertically. The rear pressure roller presses the loaded card that moves below it against the rear drive roller to increase the friction between the card and the rear drive roller, thereby making the loaded card move backward smoothly and at a constant speed.

[0010] Typically, the distance between the front drive roller and the printing drive roller, and the distance between the printing drive roller and the rear drive roller, are slightly less than the length of a single card. In this way, during the movement of the card, there will always be a point on the card that rests on one of the three drive rollers: the front drive roller, the printing drive roller, and the rear drive roller. This ensures that the card is always subjected to a driving force during its movement.

[0011] In the prior art, the front pressure roller and the rear pressure roller in the front pressure roller assembly and the rear pressure roller assembly are cylindrical hollow sleeves. The hollow sleeves can rotate freely and are equipped with tension springs. When there is no card between the hollow sleeve and the drive roller below, the hollow sleeve presses against the drive roller under the tension of the tension spring. When the front end of the moving card reaches the hollow sleeve, the card is pushed up by the drive roller located in front of the front pressure roller assembly and passes between the hollow sleeve and the drive roller under the rolling action of the drive roller below the hollow sleeve.

[0012] Similar to the pre-stage and post-stage pressure roller assemblies, 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 presses against the print drive roller. Similarly, when the front end of a moving card is about to touch the print head, the card is squeezed between the print head and the print drive roller by the pushing force generated by the pre-stage drive roller. In other words, the print head is lifted up by the card at this time.

[0013] In the above structure, the hollow sleeve normally applies downward pressure under the tension of the spring. Only when the card beneath it is driven by the driving force does the hollow sleeve experience an upward passive displacement caused by being pushed by the card. This approach has the following drawbacks:

[0014] 1) When the front end of the card traveling at the set speed touches the hollow sleeve, the card will be subject to a resistance and cause a short pause, which will prevent the card from moving stably and at a constant speed in the card conveying channel.

[0015] In this situation, if the tail area of ​​the card is being printed under the printhead, the instantaneous jump movement will greatly affect the print quality, that is, cause the printed lines to be offset and misaligned (this situation applies when the card moves from under the printhead toward the rear pressure roller assembly).

[0016] 2) When the tail edge of the card passes through the vertical plane of the hollow sleeve above the axis of the drive roller at a set speed, the hollow sleeve will quickly push the card backward under the action 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 situation, if the front area of ​​the card is being printed under the print head, the instantaneous jump movement will greatly affect the print quality, that is, cause the printed lines to be offset and misaligned due to positional delay (this situation applies to the process of the card moving from under the front pressure roller assembly towards the print head assembly).

[0018] Similarly, when the front of the card, which is traveling at a set speed, touches the print head, the card will encounter resistance and cause a brief pause, which will result in an error in the printing time.

[0019] 4) When the card is thicker, the above structure will not be suitable. The reason is that the front end of the card is in contact with the hollow sleeve or print head at a higher position, and the resistance is greater. It requires a large force to push the card to lift the hollow sleeve or print head by the driving force that drives the card. Under the condition of small size and limited motor driving force, the existing structure cannot be used to print cards with large thickness. 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 suitability for printing thicker cards.

[0021] To solve the above-mentioned technical problems, the following technical solution is adopted:

[0022] A card printer includes a front-stage pressure roller assembly disposed in front of a printhead assembly for rolling a card. The front-stage pressure roller assembly consists of a front-stage pressure roller and a front-stage drive roller mounted inside the printer, stacked vertically. The front-stage pressure roller is raised vertically by a predetermined distance relative to the front-stage drive roller at two points: when the card approaches 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 leave the pressure of the front-stage pressure roller.

[0023] The printhead in the printhead assembly is raised vertically by a predetermined distance relative to the print drive roller by an automatically height-adjustable print height adjustment component before the card approaches the printhead and the front end of the card touches the printhead.

[0024] A rear-stage pressure roller assembly for rolling the card is provided on the rear side of the printhead assembly. The rear-stage pressure roller assembly consists of a rear-stage pressure roller and a rear-stage drive roller installed in the printer, which are stacked vertically. The rear-stage pressure roller is raised by a set distance in the vertical direction relative to the rear-stage drive roller by a rear-stage height adjustment component that automatically adjusts the height. Before the card reaches the vicinity of the rear-stage pressure roller and the front end of the card touches the rear-stage pressure roller, the rear-stage pressure roller is raised by a set distance.

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

[0026] The print head height adjustment assembly consists of a bracket side plate for mounting the print head, a bracket top plate, a fixed side plate, and an abutment plate. Two fixed side plates are fixed to the inner surface of the printer's cover. The bracket side plate, carrying the print head, is mounted between the two fixed side plates in a vertically movable manner. The bracket top plate is mounted between the two fixed side plates above the bracket side plate. The front side of the bracket top plate is connected to the fixed side plates via a top plate hinge shaft. A top plate compression spring is located between the rear side of the bracket top plate and the printer cover. The abutment plate is positioned below the print drive roller and is connected to the print drive top device. When the print head is lowered and contacts the print drive roller, the abutment plate, driven by the print drive top device, forces the bracket side plate, carrying the print head, to move vertically up and down.

[0027] The rear stage height adjustment assembly consists of a rear stage pressure plate, a rear stage connecting rod, and a rear drive connecting plate. The rear stage pressure plate is positioned above the rear stage drive roller. The front or rear side of the rear stage pressure plate is connected to the printer frame via a rear stage hinge shaft. The rear stage pressure roller is rotatably mounted on the rear stage pressure plate and 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 drive connecting plate, which is positioned below the rear stage drive roller, via the rear stage connecting rod. The rear drive connecting plate is connected to the rear stage drive device. Driven by the rear stage drive device, the rear drive connecting plate forces the rear stage pressure plate to rotate around 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 drive unit, the rear-stage drive unit, and the printing drive unit all use the same drive motor, which is either a DC motor or a stepper motor. The drive motor transmits kinetic energy to the front drive connecting plate, the rear drive connecting plate, and the abutment plate respectively through a gear transmission assembly.

[0029] The gear transmission assembly consists of an energy-transmitting gear assembly, a first drive gear, and a second drive gear. The drive motor transmits kinetic energy to the first and second drive gears through the energy-transmitting gear assembly. A middle drive gear meshes between the first and second drive gears. The rear drive connecting plate is mounted on the frame via a rear drive shaft. The first and second drive gears are respectively mounted on the first and second drive shafts, which are parallel to the rear drive shaft and respectively positioned on the bottom surface of the rear drive connecting plate. On both sides of the drive shaft, at least one cam is provided on each of the first and second drive shafts. The apexes of the cams on the first and second drive shafts are 180 degrees apart in the circumferential direction. The front drive connecting plate is mounted on the frame via the front drive shaft and is located below the rear drive connecting plate. 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 either an abutment block located on the front front area of ​​the rear drive connecting plate or the front top edge of the rear drive connecting plate.

[0031] The rear drive connecting plate is mounted on the frame via a rear drive shaft, and the front drive connecting plate is mounted on the frame via a front drive shaft and located below the rear drive connecting plate. 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 connects 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 connects the rear side of the rear stage pressure plate and the rear drive connecting plate. The front stage, rear stage, and printing drive top device share two cylinders, namely a front cylinder and a rear cylinder. The front end of the piston rod of the front cylinder abuts against the front side of the rear drive connecting plate, and the front end of the piston rod of the rear cylinder abuts against the rear side of the rear drive connecting plate. The piston rods of the front cylinder and the rear cylinder move in opposite directions.

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

[0033] The front stage height adjustment assembly consists of a front stage left lifting plate, a front stage right lifting plate, and a front stage drive device. Each of the front stage left and right lifting plates has a corresponding pressure roller shaft hole. The front stage pressure roller is straddled between the two pressure roller shaft holes. Each of the left and right printer frame plates for mounting the front stage drive roller has a vertical strip hole. 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 or right lifting plate is connected to the front stage via a transmission connector, which allows the front stage left and right lifting plates to rise or fall synchronously.

[0034] The print height adjustment assembly consists of a left and right print level lifting plate and a print level for mounting the print head. Each of the print level lifting plate and the right print level lifting plate has a corresponding print head shaft hole. The print head is mounted between the two print head shaft holes via print head side shafts on its left and right sides. Each of the left and right sides of the printer frame plate for mounting the print drive roller has a vertical strip hole. The end of the print head side shaft is placed in the corresponding vertical strip hole. The print level lifting plate or the right print level lifting plate is connected to the print level, which allows the print level lifting plate and the right print level lifting plate to rise or fall synchronously, via a transmission connector.

[0035] The rear stage height adjustment assembly consists of a rear stage left lifting plate, a rear stage right lifting plate, and a rear stage. Each of the rear stage left and right lifting plates has a corresponding pressure roller shaft hole. The rear stage pressure roller is straddled between the two pressure roller shaft holes. A vertical strip hole is provided on each of the printer frame plates on the left and right sides for mounting the rear stage drive roller. The two ends of the rear stage pressure roller shaft are placed in the corresponding vertical strip holes. The rear stage left or right lifting plate is connected to the rear stage via a transmission connector, which allows the rear stage left and right lifting plates to rise or fall synchronously.

[0036] The front left lifting plate, front right lifting plate, rear left lifting plate, rear right lifting plate, printing stage left lifting plate, and printing stage right lifting plate have the same shape and structure. Each lifting plate consists of an integral upper and lower part. The upper part is rectangular or elliptical, and the pressure roller shaft hole or printing head shaft hole is located in the upper part. The lower part has at least one support foot. The transmission connection is two parallel sliding plates that reciprocate synchronously along the card conveying channel and are mounted on a slide rail. The slide rail is fixed to the frame plate, and the top edge of the sliding plate is sawn. The toothed structure has legs on each lifting plate positioned in a corresponding tooth groove and moving between the bottom and top of the groove as the sliding plate slides back and forth. In the toothed structure, the direction of the sawtooth corresponding to the front lifting plate is the same as the direction of the sawtooth corresponding to the rear lifting plate, and the direction of the sawtooth corresponding to the front lifting plate is opposite to the direction of the sawtooth corresponding to the printing plate. When the legs on the front and rear lifting plates are in the bottom of the corresponding tooth groove, the legs on the printing plate are in the top of the corresponding tooth groove.

[0037] The distance between the front support and the rear support of the front lifting plate is the same as the tooth pitch of the saw teeth in the corresponding saw tooth structure; the front drive device, the rear drive device and the printing drive device are motors that are set on one side of the sliding plate and can drive the sliding plate to move linearly back and forth.

[0038] The pre-stage height adjustment assembly includes a pre-stage left horizontal plate and a pre-stage right connecting rod, which is divided into a vertical plate and a horizontal plate. The horizontal plate is parallel to the pre-stage left horizontal plate. The pre-stage pressure roller is installed between the pre-stage left horizontal plate and the horizontal plate in a bridging manner. A shaft hole is provided on the side of the horizontal plate and the pre-stage left horizontal plate opposite to the vertical plate. A rotating shaft is provided between the two shaft holes. The left end of the rotating shaft passes through the corresponding shaft hole and is fixed or rotatably connected to the vertically arranged left base plate. A pre-stage drive device is provided below the vertical plate to drive the pre-stage right connecting rod to rotate around the axis of the rotating shaft. The pre-stage pressure roller is forced to rise or fall as the pre-stage rotates forward or backward.

[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, the print level slide rail is fixed to the left base plate, and the print level right connecting rod is divided into a vertical plate and a horizontal plate. The horizontal plate is fixed to the right side of the print head, and the vertical plate extends downward. Below the vertical plate is a print level that can drive the print level right connecting rod and the print head to move up and down along the print level slide rail.

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

[0041] The pre-stage height adjustment assembly includes a pre-stage slider plate, a pre-stage slide rail, and a pre-stage right connecting plate. The pre-stage slide rail is fixed on a vertically arranged left base plate. The pre-stage slider plate is parallel to the pre-stage right connecting rod. The pre-stage pressure roller is assembled between the pre-stage slider plate and the pre-stage right connecting rod plate. A pre-stage drive device is provided below the pre-stage right connecting plate, which can drive the pre-stage right connecting plate and the pre-stage pressure roller to move up and down along the pre-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 and a horizontal plate. The horizontal plate is fixed to the right side of the print head, and the vertical plate extends downward. Below the vertical plate is a print level that can drive the print level right connecting rod and the print head to move up and down along the print level slide rail.

[0043] The rear stage height adjustment assembly 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 a vertically arranged left base plate. The rear stage slider plate and the rear stage right connecting plate are parallel. The rear stage pressure roller is assembled between the rear stage slider plate and the rear stage right connecting plate. A rear stage drive device is provided below the rear stage right connecting plate, which 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 pre-drive unit, post-drive unit, and printing unit are a lead screw motor, an electromagnetic engagement component, and a cylinder.

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

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

[0047] The print height adjustment assembly includes a print level slider, a print level slide rail, a print level right connecting rod, and a timing belt. The print level slider is fixed to the left side of the print head, the print level slide rail is fixed to the left base plate, the print level right connecting plate is fixed to the right side of the print head, two timing wheels are mounted on the right base plate, and the timing belt is sleeved between the two timing wheels. The timing belt is provided with a fastening connector that can be fixed together with the print level right connecting plate. As the timing belt rotates forward or backward, the print level right connecting rod carries the print head up and down along the print level 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 a 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 pulleys are installed on the right base plate. The synchronous belt is sleeved between the two synchronous pulleys. A fastening connector is provided on the synchronous belt that can be fixed together with the rear stage right connecting plate. As the synchronous belt rotates forward or backward, 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 a rear stage right connecting plate, and the rear stage pressure roller is assembled on the rear stage right connecting plate. The front stage drive 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 pulley, synchronous belt, front stage right connecting plate, right side connecting plate and rear stage right connecting plate.

[0050] The pre-stage drive, post-stage drive, and printing stage drive are DC motors or stepper motors.

[0051] The pre-stage drive, post-stage drive, and printing stage drive are DC motors or stepper motors.

[0052] The above-mentioned structure ensures uniform and continuous transmission of the printing medium. After the printer obtains the card thickness information, it can adjust the pressure roller and printhead assembly to the height that can pass through the card. Therefore, it is suitable for printing both thin and thick cards, and the forward speed is uniform, so the printed content will not be stretched and deformed. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the outer contour of the printer of the present invention;

[0055] Figure 2 This is a 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 height adjustment component structure 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 Exploded view of the area;

[0062] Figure 9 This is a structural diagram of the cam scheme in Example 1;

[0063] Figure 10 for Figure 9 Exploded view of the cam;

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

[0065] Figure 12 In Example 1 Figure 11 Right oblique view;

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

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

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

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

[0070] Figure 17 for Figure 16 Exploded view;

[0071] Figure 18 This is a schematic diagram of the front and rear pressure rollers rising and the print head pressing down (serrated scheme) in Example 2;

[0072] Figure 19 This is a schematic diagram of the simultaneous lifting of the front pressure roller and the rear pressure roller, and the downward pressing of the print head in Example 2 (serrated scheme);

[0073] Figure 20 This is a schematic diagram of the front and rear pressure rollers pressing down and the print head rising (serrated scheme) in Example 2;

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

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

[0076] Figure 23 for Figure 22 Exploded view of the area;

[0077] Figure 24 This is a schematic diagram of the lead screw solution in Example 4;

[0078] Figure 25 for Figure 24 Exploded view of the lead screw design;

[0079] Figure 26 This is a schematic diagram of the three lead screw schemes in Example 4;

[0080] Figure 27 This is a schematic diagram of Example 5 (Synchronous Belt Scheme);

[0081] Figure 28 for Figure 27 A schematic diagram showing the replacement with two synchronous belt schemes;

[0082] Figure 29 for Figure 28 Exploded view of a portion of the synchronous belt.

[0083] The attached figures are labeled as follows:

[0084] Card printer 1, cover 11, housing 12, card compartment 13, printhead assembly 14, printhead 141, print drive roller 142, removal channel 15, front pressure roller assembly 16, front pressure roller 161, front drive roller 162, rear pressure roller assembly 17, rear pressure roller 171, rear drive roller 172, sensor device 18.

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

[0086] Printer height adjustment component 200, fixed side plate 201, bracket top plate 202, bracket side plate 203, abutment plate 204, left printing stage lifting plate 205, right printing stage lifting plate 206, left printing stage frame plate 207, right printing stage frame plate 208, print head shaft hole 209, print head side shaft 210, printing stage slider 211, printing stage slide rail 212, right printing stage 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] The following components are included: 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 horizontal 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 side connecting plate 417.

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

[0089] Gear transmission assembly 500, energy transmission gear assembly 501, drive cam 1 gear 502, drive cam 2 gear 503, intermediate gear 504, drive cam 1 shaft 505, drive cam 2 shaft 506, cam 507, drive motor 508, front cylinder 509, rear cylinder 510, front drive shaft 511, rear drive shaft 512. Detailed Implementation

[0090] I. 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 transmitted at a uniform speed.

[0092] Within the card transport channel of the printer 1, from front to back, there are a card compartment 13 for storing blank cards (i.e., cards to be printed), a print head assembly 14, and an exit channel 15 for removing cards with printed text and patterns (hereinafter referred to as content cards) from the printer.

[0093] Within the card transport channel, a front-stage pressure roller assembly 16 for driving blank cards and a sensor device 18 for detecting the position of blank cards are sequentially arranged between the card compartment 13 and the printhead assembly 14.

[0094] like Figure 1 As shown, the front-stage pressure roller assembly 16 is positioned in front of the printhead assembly 14 (the blank card inlet is the front, and the exit channel side is the rear, so that...). Figure 1 (Taking the paper as an example, the left side is the front, and the right side is the back, the same below). The front pressure roller assembly 16 is used to roll the card towards the printhead assembly 14. It consists of a pressure roller (hereinafter referred to as the front pressure roller 161) and a drive roller (hereinafter referred to as the front drive roller 162) installed in the printer 1, which are stacked one above the other. The front pressure roller 161 can press the blank card against the front drive roller 162 below it with a certain pressure to increase the friction between the card and the front drive roller 162 and prevent the front drive roller 162 from slipping when rolling the card.

[0095] One improvement of the present invention is that the front pressure roller 161 is raised vertically by a predetermined distance (0mm-4mm, preferably 0mm-3.1mm) relative to the front drive roller 162 when the card approaches the front pressure roller 161 and the front end of the card (here, "front end" refers to the first end of the card during the front-to-back movement in the card conveying channel, the same below) is about to touch the front pressure roller 161 and / or the rear end of the card (here, "rear end" refers to the last end of the card during the front-to-back movement in the card conveying channel, the same below) is about to disengage from the front pressure roller 161 pressing against it.

[0096] The sensor device 18 is designed to accurately detect the status signals of the card position, card width, and card thickness, and transmit these 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 raised vertically by a predetermined distance (0mm-4mm, preferably 0mm-3.7mm) relative to the drive roller (hereinafter referred to as the print drive roller 142) below the print head 141 by an automatically height-adjustable print height adjustment component 200, when the card approaches the print head 141 and is about to touch the print head 141 at its front end and / or is about to leave the print head 141 at its rear end. The print head assembly 14 includes a print head 141 and a print drive roller 142 disposed below the print head 141 for moving the card.

[0098] Another improvement of the present invention is that a rear pressure roller assembly 17 for rolling the card is provided on the rear side of the printhead assembly 14. The rear pressure roller assembly 17 is composed of a pressure roller (hereinafter referred to as the rear pressure roller 171) and a drive roller (hereinafter referred to as the rear drive roller 172) installed in the printer in an up-and-down stacked manner. The rear pressure roller 171 is raised by a set distance (0mm-4mm, preferably 0mm-2.7mm) in the vertical direction relative to the rear drive roller 172 when the content card moves to the vicinity of the rear pressure roller 171 and the front end of the card is about to touch the rear pressure roller 171, by a rear height adjustment component 300 that automatically adjusts the height.

[0099] When a card is inserted into the card compartment 13, a sensor installed on the printer 1 detects the card thickness information, and the main control circuit can control the raising of the front pressure roller 161 in the front height adjustment assembly 100, the print head 141 in the print height adjustment assembly 200, and the rear pressure roller 171 in the rear height adjustment assembly 300.

[0100] The maximum beneficial effects of the present invention, which includes the pre-stage height adjustment component 100, the print height adjustment component 200, and the post-stage height adjustment component 300, are as follows:

[0101] 1. Preamplifier height adjustment component 100

[0102] When the front end of the card traveling at a set speed is about to touch the front pressure roller 161, the front pressure roller 161 rises. This prevents the front end of the card from encountering resistance due to collision with the front pressure roller 161 and causing a short-term pause, ensuring that the card moves in the card conveying channel at a stable and uniform speed. At the same time, it also prevents the card from being obstructed due to excessive thickness.

[0103] When the rear end of the card, traveling at a set speed, is about to leave the contact pressure of the front pressure roller 161, the front pressure roller 161 rises. This prevents the card from being pushed towards the printhead assembly 14 in an instantaneous, jumping manner under the pressure of the front pressure roller 161 and the front drive roller 162 that rolls the card (i.e., when the rear edge of the card moves and crosses the vertical plane position of the front pressure roller 161 above the axis, the front pressure roller 161 loses the support of the card, and under the action of other components applying downward pressure to the front pressure roller 161, the front pressure roller 161 will squeeze downward, causing the card to be quickly ejected). In this way, it is avoided that the printing quality of the part of the card being printed below the printhead 141 will be misaligned due to the rapid extrusion action, resulting in a positional shift in the "line content" (i.e., the content displayed in each line of the printed text pattern). (Typically, the distance between the front 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, which is traveling at a set speed, is about to touch the print head 141, the print head 141 rises. This ensures that the card moves at a stable and uniform speed in the card transport channel, avoids the card from being obstructed due to its thickness, and prevents the card from experiencing a short pause after encountering resistance, thus avoiding errors in printing time.

[0106] 3. Post-amplifier height adjustment component 300.

[0107] When the front end of the card traveling at a set speed is about to touch the rear pressure roller 171, the rear pressure roller 171 rises to avoid the card from encountering resistance and causing a short-term pause. This setting ensures that the card moves in the card conveying channel at a stable and uniform speed. On the other hand, it prevents the card from suddenly stopping due to obstruction, which would cause the printing quality of the part of the card being printed below the print head 141 to be offset and misaligned, resulting in the "line content" being ahead of the print head.

[0108] II. The following are embodiments of the present invention that enable the above-mentioned beneficial effects:

[0109] (I) Example 1

[0110] 1. Basic Scheme of this Embodiment

[0111] 1) Preamplifier height adjustment component 100

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

[0113] The front pressure plate 101, preferably a rectangular plate, is disposed above the front drive roller 162. The front side or rear side (preferably the front side in this invention) of the front pressure plate 101 is connected to the frame of the printer 1 (which is an integrally formed frame disposed in the printer housing 12 and which forms the card conveying channel) via the front hinge shaft 104 (preferably a bearing connection). A spring (hereinafter referred to as the front return spring 105) is provided on the front hinge shaft.

[0114] The central area of ​​the front pressure plate 101 has a hollow structure, which is used to accommodate the front pressure roller 161. The front 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 card before printing when the blank card enters the printer 1, effectively removing foreign objects from the card. The roller sleeve is fitted onto the sleeve, and the connection between them can be fixed or rotatable. A roller shaft passes through the sleeve, and each end of the roller shaft has an annular groove. The roller sleeve and sleeve are constrained between the two annular grooves by a retaining spring, and the sleeve can rotate freely on the roller shaft carrying the roller sleeve. The front pressure plate 101 on the left and right sides of the hollow space is provided with a bushing and a shaft hole, respectively. One end of the roller shaft of the front pressure roller 161 is inserted into the bushing, and the other end of the roller shaft is inserted into the shaft hole through a quick-release structure. The front pressure roller 161 is rotatably mounted on the front pressure plate 101 and located directly above the front drive roller 162.

[0115] The front stage connecting rod 102 is preferably two rods, 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 arranged vertically, 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 side ear plate 411 extending downward is provided on the other side of the front stage pressure plate 101. 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 between the front stage pressure roller 161 and the front stage drive roller 162 when the front stage connecting rod 102 is pulled down and pressed against the front stage drive roller 162, so that the front stage pressure roller 161 can be lifted.

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

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

[0118] The second method involves providing 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 configuration is preferred in this invention. The front drive connecting plate 103 is mainly used to transmit the kinetic energy output by the drive device (hereinafter referred to as the front drive device) to the front connecting rod 102, so that the front connecting rod 102 moves up and down, thereby raising or lowering the front pressure plate 101 carrying the front pressure roller 161.

[0120] In the first method described above, the front drive connecting plate 103 and the front stage connecting rod 102 are integrated into one unit. The part below the support shaft on the front stage connecting rod 102 can be regarded as the front drive connecting plate 103. The front drive device is connected to the lower end of the front stage connecting plate 102 through a transmission connector. Driven by the front drive device, the front pressure plate 101 is forced to rotate about the front hinge shaft 104 and the front pressure roller 161 moves up and down in the vertical direction.

[0121] In the second method described above, the front drive connecting plate 103 is an independent component, horizontally arranged, and connected to the frame via positioning holes and a support shaft. The front end of the front drive connecting plate 103 is hinged to the lower end of the front stage connecting rod 102, and the rear end of the front drive connecting plate 103 is connected to the front stage drive device via a transmission connector. 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 rotate about the support shaft axis and push the front stage connecting rod 102 upward or pull it downward, thereby forcing the front stage pressure plate 101 to rotate about the front stage hinge shaft 104 and causing the front stage pressure roller 161 to move up and down in the vertical direction. The front return spring 105 keeps the side of the front pressure plate 101 without the front hinge shaft 104 in a downward pressure state. Its function is to keep the front pressure roller 161 in a downward pressure state when the front drive connecting plate 103 does not apply driving force to it through the front connecting rod 102.

[0122] The pre-drive device can be a stepper motor, a lead screw motor, a cylinder, or an electromagnetic engagement 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. Fixed side plate 201, preferably two plates that are symmetrical and parallel to each other with the card conveying channel as the reference, namely a left fixed side plate and a right fixed side plate. The left fixed side plate and the right fixed side plate are fixed together by a top cover plate 218. The top cover plate 218 can be the cover plate of the printer or a separate flat plate. The left fixed side plate, the right fixed side plate and the top cover plate 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 by means of the hanging shaft 221 provided on the outside of the print head housing. Its function is to allow the print head 141 to be quickly and easily removed when it needs to be replaced.

[0127] b. A bracket top plate 202 is installed on top of the print head 141. The front side of the bracket top plate (202) is connected to the fixed side plate 201 through a top plate hinge shaft (222). There are protrusions 216 on the two outer sides of its rear part. Correspondingly, there are strip guide holes 217 on the left and right fixed side plates. The rear part of the bracket top plate 202 is placed in the strip guide holes 217 through the protrusions 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 rear top surface of the bracket top plate 202 and the top cover plate 218. Normally, under the action of the top plate compression spring 219, the protrusions 216 are placed at the lower end of the strip guide holes 217. When the bracket top plate 202 is subjected to an upward external force, the protrusions 216 can move up to the upper end of the strip guide holes 217.

[0128] c. The support side plates 203 consist of two pieces, namely the left support side plate and the right support side plate, which are respectively fixed to the left and right sides of the printhead housing. The hanging shaft 221 on the printhead 141 is a short column shaft, which is located on the upper part of the outer side of the support side plate 203. The printhead 141 can be installed between the left and right fixed side plates by placing the hanging shaft 221 on the hook 220.

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

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

[0131] When it is necessary to lift the print head 141 and disengage it from the print drive roller 142, the abutment plate 204 forces the support side plate 203 to move the print head 141 upward in the vertical direction through the drive of the print drive device.

[0132] The printing drive device can be a stepper motor, a lead screw motor, a cylinder, or an electromagnetic engagement component.

[0133] 3) Power amplifier 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 consists 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 pressure plate 301, preferably a rectangular plate, is disposed above the rear drive roller 172. The front or rear side (preferably the front side in this invention) of the rear pressure plate 301 is connected to the printer frame (which is an integrally formed frame disposed inside the printer housing 102 and which forms the card conveying channel) via the rear hinge shaft 304 (preferably a bearing connection). A spring (hereinafter referred to as the rear return spring 305) is provided on the rear hinge shaft 304.

[0136] The central area of ​​the rear pressure plate 301 has a hollow structure, and the hollow space is used 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 mounted on the rear pressure plate 301 and located directly above the rear drive roller 172.

[0137] The rear stage connecting rod 302 is preferably two rods, 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 arranged vertically, and their upper ends are connected to the opposite side of the rear stage hinge shaft 304 on the rear stage pressure plate 301 through a hinge structure.

[0138] The preferred hinge structure of the present invention is as follows: a downwardly extending side ear plate 411 is provided on the other side of the rear 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 pressure plate 101.

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

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

[0141] The second method involves providing 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 configuration is preferred in this 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 carrying the rear pressure roller 171.

[0143] In the first method described above, the rear drive connecting plate 303 and the rear stage connecting rod 302 are integrated into one unit. The part below the support shaft on the rear stage connecting rod 302 can be regarded as the rear drive connecting plate 303. The rear stage drive device is connected to the lower end of the rear stage connecting rod 302 through a transmission connector. Driven by the rear stage drive device, the rear stage pressure plate 301 is forced to rotate about 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 method described above, the rear drive connecting plate 303 is an independent component, horizontally arranged, and connected to the frame via positioning holes and a support shaft. The front end of the rear drive connecting plate 303 is hinged 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 connector. 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 rotate about the support shaft axis and push the rear stage connecting rod 302 upward or pull it 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 reset spring 305 keeps the side of the rear pressure plate 301 without the rear hinge shaft 304 in a downward pressure state. Its function is to keep the rear pressure roller 171 in a downward pressure state when the rear drive connecting plate 303 does not apply driving force to it through the rear connecting rod 302.

[0145] The subsequent drive unit can be a stepper motor, a lead screw motor, a cylinder, or an electromagnetic engagement component.

[0146] 2. Further improvements to this embodiment

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

[0148] 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 front bottom surface of the rear drive connecting plate 303, and the rear side of the top surface of the front drive connecting plate 103 abuts against the front side of the bottom surface of the rear drive connecting plate 303 in a contact manner.

[0149] The front connecting rod 102 is connected between the rear side of the front pressure plate 101 and the front side of the front drive connecting plate 103, and the rear connecting rod 302 is connected between the rear side of the rear pressure plate 301 and 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 disposed on the front front area of ​​the rear drive connecting plate 303 or the front top edge of the rear drive connecting plate 303.

[0152] The gear transmission assembly 500 is composed of multiple gears (hereinafter referred to as energy-transmitting gear assembly 501, convex drive gear 502, and convex drive gear 503). The drive motor 508 transmits kinetic energy to the first drive gear 502 and the second drive gear 503 through the energy transfer gear assembly 501. A middle gear 504 meshes between the first drive gear 502 and the second drive gear 503. The first drive gear 502 and the second drive gear 503 are respectively mounted on two rotating shafts (hereinafter referred to as the first drive shaft 505 and the second drive shaft 506). The first drive shaft 505 and the second drive shaft 506 are parallel to the rear drive shaft 512 and are respectively located on both sides of the rear drive shaft 512 on the bottom surface of the rear drive connecting plate 303. At least one cam 507 is provided in the middle of the bottom surface of the first drive shaft 505 and the second drive shaft 506. The vertices of the cam 507 on the first drive shaft 505 and the cam 507 on the second drive shaft 506 are 180 degrees apart in the circumferential direction.

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

[0154] The operating state of the height adjustment component in this embodiment:

[0155] The vertex of cam 507 on the first drive shaft 505 rotates to the upper second drive shaft 506, and the vertex of cam 507 rotates to the lower position, causing the front end of the rear drive connecting plate 303 to swing downward and the rear end to swing upward. The rear top surface 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 raised by a set distance in the vertical direction relative to the front drive roller 162 and the rear drive roller 172. The printing height adjustment component 200 presses against the printing drive roller 142 in the vertical direction relative to the printing drive roller 142.

[0156] When the apex of cam 507 on drive shaft 1 505 and the apex of cam 507 on drive shaft 2 506 rotate to the same position (i.e., the critical point), the pre-stage height adjustment component 100, the post-stage height adjustment component 300 and the print height adjustment component 200 press against the pre-stage drive roller 162, the post-stage drive roller 172 and the print drive roller 142 in the vertical direction.

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

[0158] The gear transmission assembly 500 consists of multiple gears (hereinafter referred to as energy-transmitting gear assembly 501 and drive cam 1 gear 502). The drive motor 508 transmits kinetic energy to drive cam 1 gear 502 through energy-transmitting gear assembly 501. A middle gear 504 is provided at the rear end of drive cam 1 gear 502. Drive cam 1 gear 502 is mounted on a rotating shaft (hereinafter referred to as drive cam 1 rotating shaft 505). Drive cam 1 rotating shaft 505 is parallel to the rear drive shaft 512 and is respectively set 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 provided in the middle of the bottom surface of drive cam 1 rotating shaft 505. The vertices of the cams 507 on drive cam 1 rotating shaft 505 are 180 degrees apart in the circumferential direction.

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

[0160] The biggest advantage of this improvement is:

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

[0162] 2) When using Cam 507, its structural strength is high, making the printer run more stably.

[0163] 3. Another improvement to 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, and the rear side of the top surface of the front drive connecting plate 103 abuts against the front side of the bottom surface of the rear drive connecting plate 303 in a contact manner. The front stage connecting rod 102 connects 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 connects 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 unit, the rear-stage drive unit, and the printing drive unit share two cylinders: a front cylinder 509 and a rear cylinder 510. The front end of the piston rod of the front cylinder 509 abuts against the front side of the rear drive connecting plate 303, and the front end of the piston rod of the rear cylinder 510 abuts against the rear side of the rear drive connecting plate 303. The piston rods of the front cylinder 509 and the rear cylinder 510 move in opposite directions.

[0166] By alternating the 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 printing height adjustment component 200 operate in the aforementioned manner, so that the front-stage pressure roller 161, the rear-stage pressure roller 171 and the print head 141 are raised or lowered relative to the front-stage drive roller 162, the rear-stage drive roller 172 and the printing drive roller 142, respectively.

[0167] 4. Further 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, and the rear side of the top surface of the front drive connecting plate 103 abuts against the front side of the bottom surface of the rear drive connecting plate 303 in a contact manner. The front stage connecting rod 102 connects 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 connects 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 drive unit, the rear-stage drive unit, and the printing drive unit share a single cylinder, with the front end of the cylinder piston rod abutting against the front side of the rear drive connecting plate 303.

[0170] The cylinder causes the pre-stage height adjustment assembly 100, the post-stage height adjustment assembly 300, and the print height adjustment assembly 200 to operate in the aforementioned manner, so that the pre-stage pressure roller 161, the post-stage pressure roller 171, and the print head 141 are raised or lowered relative to the pre-stage drive roller 162, the post-stage drive roller 172, and the print drive roller 142, respectively.

[0171] The biggest advantage of this improvement is:

[0172] 1) Fewer drive components, resulting in lower material costs;

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

[0174] (II) Example 2

[0175] 1. Basic Scheme of this Embodiment

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

[0177] 1) Preamplifier height adjustment component 100

[0178] like Figure 13 , Figure 15 As shown, the pre-stage height adjustment assembly 100 consists of a left lifting plate (hereinafter referred to as the pre-stage left lifting plate 106), a right lifting plate (hereinafter referred to as the pre-stage right lifting plate 107), and a pre-stage drive device.

[0179] The front left lifting plate 106 is composed of an integral upper and lower part. The upper part is rectangular or elliptical and has a shaft hole (hereinafter referred to as pressure roller shaft hole 108). The lower part is a support leg or is composed of a front support leg 402 and a rear support leg 403 spaced apart. Preferably, the two support legs are of the same length and are symmetrical about the central axis of the upper part.

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

[0181] The front-stage left frame plate 109 (207, 308) and the front-stage right frame plate 110 (208, 309) are respectively located on the left and right sides of the front side inside the printer housing 12. The front-stage drive roller 162 is installed across the front-stage left frame plate 109 (207, 308) and the front-stage right frame plate 110 (208, 309). Each frame plate has a vertical strip hole 401 at the top. The two ends of the front-stage pressure roller 161 are placed in the vertical strip hole 401 on the corresponding side. The bottom of the two frame plates is provided with a slide rail integral with it.

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

[0183] The aforementioned pre-drive device can be a stepper motor, a lead screw motor, a cylinder, or an electromagnetic engagement 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 the print head left lifting plate (hereinafter referred to as print level left lifting plate 205) and the print head right lifting plate (hereinafter referred to as print level right lifting plate 206) installed on the bottom of the outside of the print head housing 12.

[0186] The printing left lifting plate 205 is composed of an integral upper and lower part. 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 arranged at intervals. Preferably, the two support legs are of the same length and are symmetrical about the central axis of the upper part.

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

[0188] The frame plates are respectively located on the left and right sides of the middle of the printer housing 12. The printing drive roller 142 is installed between the left frame plate 207 (308, 109) and the right frame plate 208 (309, 110). Each of the two frame plates has a vertical strip hole 401 at the top. 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 integral with it.

[0189] The transmission connector consists of two parallel sliding plates 413 mounted on a slide rail that reciprocate synchronously along the card conveying channel (one end of each sliding plate 413 is connected to the drive device). These are a left and right sliding plate for printing. The top edge of each sliding plate 413 has a serrated structure. The front support 402 and the rear support 403 are respectively placed in a corresponding tooth groove in the serrated structure and move between the bottom and top of the tooth groove as the sliding plate 413 slides back and forth.

[0190] The printing-level drive device can be a stepper motor, a lead screw motor, or a cylinder.

[0191] 3) Power amplifier height adjustment component 300

[0192] like Figure 13 , Figure 15 As shown, the rear stage height adjustment assembly 300 consists 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 drive device.

[0193] The rear stage left lifting plate 306 and rear stage right lifting plate 307 have the same shape and structure as the front stage left lifting plate, and also have a rectangular or elliptical upper part and a support leg or front support leg 402 and rear support leg 403 set at the lower part. The rear stage left lifting plate 306 and rear stage right lifting plate 307 are arranged in parallel, and are respectively assembled on the inner side of the rear stage left frame plate 308 (207, 109) and rear stage right frame plate 309 (208, 110) set in the printer housing 12. The rear stage left lifting plate 306 and rear stage right lifting plate 307 are respectively provided with a corresponding pressure roller shaft hole 108, and the rear stage pressure roller 171 is straddled between the two pressure roller shaft holes 108. The rear left lifting plate 306 or the rear right lifting plate 307 is connected to a drive device (hereinafter referred to as the rear drive device) that enables the rear left lifting plate 306 and the rear right lifting plate 307 to rise or fall synchronously via a transmission connector.

[0194] The rear stage left frame plate 308 (207, 109) and the rear stage right frame plate 309 (208, 110) are respectively located on the left and right sides of the rear side inside the printer housing 12. The rear stage drive roller 172 is bridging between the two frame plates. Each frame plate has a vertical strip hole 401 at the upper part. The two ends of the roller shaft of the rear stage pressure roller 171 are placed in the vertical strip hole 401 on the corresponding side. The bottom of the two frame plates is provided with a slide rail integral with it.

[0195] The transmission connector consists of two parallel sliding plates 413 mounted on a slide rail that reciprocate synchronously along the card conveying channel (one end of each sliding plate 413 is connected to the drive device). These are a rear left sliding plate and a rear right sliding plate, respectively. The top edge of each sliding plate 413 has a sawtooth structure. The support leg or front support leg 402 and rear support leg 403 are respectively 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 413 slides back and forth.

[0196] The aforementioned pre-drive device can be a stepper motor, a lead screw motor, a cylinder, or an electromagnetic engagement component.

[0197] 2. Further improvements to this embodiment

[0198] like Figure 13 , Figure 14 , Figures 16 to 20 As shown, the sliding plate 413 in the pre-stage height adjustment assembly 100, the printing height adjustment assembly 200, and the post-stage height adjustment assembly 300 is an integral structure. Its length is preferably greater than the distance between the pre-stage pressure roller 161 and the post-stage pressure roller 171. The sliding plate 413 is fixed together on both sides by connecting rods. The pre-stage drive device, the post-stage drive device, and the printing stage drive device can be motors that are set on one side of the sliding plate 413 and can drive the sliding plate 413 to move linearly back and forth.

[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 differ). In the serrated structure, the direction of the serrations 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 serrations 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 lifting plate is opposite to the direction of the saw teeth corresponding to the printing plate (including the printing plate left lifting plate 205 and the printing plate right lifting plate 206); when the support feet or the front support feet 402 and the rear support feet 403 on the front lifting plate and the rear 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 plate fall into the tooth top of the corresponding tooth groove, and the distance between the support feet or the front support feet 402 and the rear support feet 403 of the front lifting plate is the same as the tooth pitch of the saw teeth in the corresponding saw tooth structure.

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

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

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

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

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

[0205] 1) Its structure is simple and the material cost is low.

[0206] (III) Example 3

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

[0208] 1) Preamplifier height adjustment component 100

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

[0210] The front left horizontal plate 111 is a long strip plate, fixed on the horizontally arranged left base plate 408, and has a shaft hole at the front end for mounting the rotating shaft.

[0211] The front-stage right connecting rod 112 is preferably inverted "L" shape, consisting of 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 mounted 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 drive roller 162. The front drive roller 162 is fixed at both ends to the left base plate 408 and the right base plate (not shown in the figure), respectively. A shaft hole is provided on the horizontal plate portion 405 at a position corresponding to the shaft hole on the front left horizontal plate 111. A rotating shaft is provided between the two shaft holes. The left end of the rotating shaft passes through the corresponding shaft hole and is fixedly or rotatably connected to the left base plate 408. The front pressure roller 161 is forced to rise or fall as the front right connecting rod 112 rotates forward or backward. The front left horizontal plate 111 rotates synchronously with the front right connecting rod 112. The horizontal plate portion 405 and the front 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 pressure roller 161 to fix the front left cross plate 111 to the cross plate portion 405.

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

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

[0215] d. The two ends of the rotating shaft are interference-fitted with the holes on the horizontal plate 405 and the front left horizontal plate 111.

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

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

[0218] h. Keyways are provided at both ends of the rotating shaft, the horizontal plate 405, and the front left horizontal plate 111, respectively, and are connected by keys, so that the two ends of the rotating shaft, the horizontal plate 405, and the front left horizontal plate 111 are circumferentially fixed. At the same time, snap ring grooves are provided at both ends of the keyways of the rotating shaft, and the snap rings are used to fix it axially.

[0219] A front-stage drive device is connected below the vertical plate 404, which can drive the front-stage right connecting rod 112 to rotate around the axis of rotation.

[0220] The pre-drive device can be a lead screw motor, a stepper motor, a cylinder, or an electromagnetic engagement 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 print level slider 211), a slide rail (hereinafter referred to as print level slide rail 212), and a right connecting rod (hereinafter referred to as print level right connecting rod 213).

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

[0224] The shape of the right connecting rod 213 is preferably configured in one of the following two ways:

[0225] In the first case, the shape of the 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 405 is fixed to the right side of the print head 141, the vertical plate 404 extends downward, and the print drive connecting plate is disposed at the lower end of the vertical plate 404.

[0227] Secondly, the right-side rod 213 of the printing plate can also be a vertically extending plate with an integral structure, and its upper end is fixed.

[0228] On the right side of printhead 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, 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.

[0230] The printing-level drive device can be a lead screw motor, a stepper motor, a cylinder, or an electromagnetic engagement component.

[0231] 3) Power amplifier height adjustment component 300

[0232] like Figure 19 As shown, the rear stage height adjustment assembly 300 consists 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 a long strip plate, fixed to the horizontally arranged left base plate 408, and has a front end for mounting.

[0234] The shaft hole for mounting the rotating shaft.

[0235] The rear stage right connecting rod 311 is preferably inverted "L" shape, 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 drive roller 172. The two ends of the rear stage drive roller 172 are respectively installed on the left base plate 408 and the right base plate (not shown in the figure), and are connected to the rear stage pressure roller 171 on the horizontal plate portion 405. A shaft hole is provided at a position corresponding to the shaft hole on the left horizontal plate 310. A rotating shaft is provided between the two shaft holes. The left end of the rotating shaft passes through the corresponding shaft hole and is fixed or rotatably connected to the horizontally arranged left base plate 408. The rear pressure roller 171 is forced to rise or fall as the rear right connecting plate 314 rotates forward or backward. The rear left horizontal plate 310 and the rear right connecting rod 311 rotate synchronously. The horizontal plate part 405 and the rear left horizontal plate 310 are fixed relative to each other. The preferred fixing method is as follows:

[0236] a. A crossbeam plate 406 is provided on the side of the rear pressure roller 171 to fix the rear left cross plate 310 to the cross plate portion 405.

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

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

[0239] d. The two ends of the rotating shaft are interference-fitted with the holes on the horizontal plate 405 and the rear left horizontal plate 310.

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

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

[0242] h. Keyways are provided at both ends of the rotating shaft, the horizontal plate 405, and the rear left horizontal plate 310, respectively, and are connected by keys, so that the two ends of the rotating shaft, the horizontal plate 405, and the rear left horizontal plate 310 are circumferentially fixed. At the same time, snap ring grooves are provided at both ends of the keyways of the rotating shaft, and the snap rings are used to fix it axially.

[0243] A rear drive device is connected below the lower end of the vertical plate 404, which can drive the rear right connecting rod 311 to rotate around the axis of rotation.

[0244] The subsequent drive unit can be a lead screw motor, a stepper motor, a cylinder, or an electromagnetic engagement component.

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

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

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

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

[0249] (iv) Example 4

[0250] 1. Basic Scheme of this Embodiment

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

[0252] 1) Preamplifier height adjustment component 100

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

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

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

[0256] The front right connecting plate 115 is a long strip plate. A front drive device is connected below the front right connecting plate, which can drive the front right connecting plate 115 and the front pressure roller 161 to move up and down along the front slide rail 114.

[0257] The pre-drive unit consists of a lead screw motor, a stepper motor, an electromagnetic engagement 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 print level slider 211), a slide rail (hereinafter referred to as print level slide rail 212), and a right connecting rod (print level right connecting rod 213).

[0260] The printing level slider 211 is fixed 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 carries the print head 141 and moves up and down on the printing level slide rail 212.

[0261] The right connecting rod 213 of the printing stage is preferably configured in two ways as follows:

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

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

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

[0265] The printing-level drive device can be a lead screw motor, a stepper motor, an electromagnetic engagement component, or a cylinder.

[0266] 3) Power amplifier height adjustment component 300

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

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

[0269] The rear slide plate 312 is parallel to the rear right connecting plate 314, and the rear pressure roller 171 is assembled between the rear slide plate 312 and the rear right connecting plate 314 and is located directly above the rear drive roller 172.

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

[0271] The subsequent drive device is a lead screw motor, a stepper motor, an electromagnetic engagement 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 drive unit, the rear drive unit, and the printing stage drive unit respectively drive the front slider plate 113, the rear slider plate 312, and the printing stage right connecting rod 213 to raise the front pressure roller 161, the rear pressure roller 171, the print head 141, the front drive roller 162, and the rear drive roller 172 by a set distance in the vertical direction relative to the front drive roller 162, the rear drive roller 172, and the print drive roller 142.

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

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

[0276] The subsequent drive device is a lead screw motor, a stepper motor, an electromagnetic engagement component, or a cylinder.

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

[0278] 1) Achieve precise control over the lifting distance of the front pressure roller 161, the rear pressure roller 171, and the print head 141;

[0279] 2) The printer is quiet when in motion.

[0280] (V) Example 5

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

[0282] 1. Basic Scheme of this Embodiment

[0283] 1) Preamplifier height adjustment component 100

[0284] like Figure 27As shown, the preamplifier height adjustment assembly 100 consists of a slider plate (hereinafter referred to as preamplifier slider plate 113), a slide rail (hereinafter referred to as preamplifier slide rail 114), a right connecting plate (hereinafter referred to as preamplifier right connecting plate 115), and a timing belt 407.

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

[0286] The front slider plate 113 is parallel to the front right connecting plate 115, and the front pressure roller 161 is assembled between the front slider plate 113 and the front right connecting plate 115 and is located directly above the front drive roller 162.

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

[0288] The synchronous belt 407 is provided with a fastening connector 410 that can be fixed together with the front right connecting plate 115. The fastening connector 410 can prevent the synchronous belt 407 from running off track when rotating. As the synchronous belt 407 rotates forward or backward, the front right connecting plate 115 carries the front pressure roller 161 and moves up and down along the front slide rail 114.

[0289] The pre-drive unit can be a DC motor or a stepper 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 print level slider 211), a slide rail (hereinafter referred to as print level slide rail 212), a right connecting plate (hereinafter referred to as print level right connecting rod 213), and a timing belt 407.

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

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

[0294] A vertical strip-shaped hole 401 is provided in the middle of the right substrate. The right roller shaft of the print drive roller 142 passes through the vertical strip-shaped hole 401. A print stage drive device is provided at the lower part of the right substrate. Two synchronous pulleys 409 are respectively installed at the upper and lower ends of the right substrate. A synchronous belt 407 is sleeved between the two synchronous pulleys 409. A fastening connector 410 is provided on the synchronous belt 407, which can be fixed together with the right connecting rod 213 of the print stage. The fastening connector 410 can prevent the synchronous belt 407 from deviating when rotating. As the synchronous belt 407 rotates forward or backward, the right connecting rod 213 of the print stage carries the print head 141 and moves up and down along the print stage slide rail 212.

[0295] The printing-level drive device can be a DC motor or a stepper motor.

[0296] 3) Power amplifier height adjustment component 300

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

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

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

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

[0301] A vertical strip hole 401 is provided on the rear side of the right substrate. The right roller shaft of the rear drive roller 172 passes through the strip hole. The right substrate is provided with a rear drive device. Two synchronous pulleys 409 are respectively installed at both ends of the right substrate. The synchronous belt 407 is sleeved between the two synchronous pulleys 409.

[0302] The synchronous belt 407 is provided with a fastening connector 410 that can be fixedly connected to the rear right connecting plate 314. The fastening connector 410 can prevent the synchronous belt 407 from deviating when rotating. As the synchronous belt 407 rotates forward or backward, the rear right connecting plate 314 carries the rear pressure roller 171 and moves up and down along the rear slide rail 313.

[0303] The aforementioned downstream drive unit can be a DC motor or a stepper motor.

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

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

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

[0307] 2. A further improvement to this embodiment is: as follows: Figures 28 to 29 As shown, the aforementioned rear-stage height adjustment assembly 300 and the front-stage height adjustment assembly 100 use the same driving device, and the rear-stage height adjustment assembly 300 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, and the left end of the rear-stage drive roller 172 is fixed on the left base plate 408.

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

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

[0310] 1) When it is necessary to replace the timing belt 407, it can be easily disassembled and installed;

[0311] 2) Because the timing belt 407 has slight elasticity, it has a buffering and vibration reduction effect during printer operation or when the front pressure roller 161, rear pressure roller 171 and print head 141 are lifted, making the printer move more smoothly.

Claims

1. A card printer, comprising a front-stage pressure roller assembly (16) disposed on the front side of a printhead assembly (14) for rolling a card, the front-stage pressure roller assembly (16) being composed of a front-stage pressure roller (161) and a front-stage drive roller (162) mounted in the printer in an up-and-down stacked manner, wherein the front-stage pressure roller (161) is raised vertically by a predetermined distance relative to the front-stage drive roller (162) at two position nodes: 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) before the card passes near the print head (141) and touches the print head (141) at the front end of the card by an automatically height-adjusting print height adjustment component (200). A rear pressure roller assembly (17) for rolling the card is provided on the rear side of the printhead assembly (14). The rear pressure roller assembly (17) is composed of a rear pressure roller (171) and a rear drive roller (172) installed in the printer in an up-down stacked manner. The rear pressure roller (171) is raised vertically by a set distance relative to the rear drive roller (172) before the card moves to the vicinity of the rear pressure roller (171) and the front end of the card touches the rear pressure roller (171) by a rear height adjustment assembly (300). characterized in that The front stage height adjustment assembly (100) consists of a front stage left lifting plate (106), a front stage right lifting plate (107), and a front stage drive device. Each of the front stage left lifting plate (106) and the front stage right lifting plate (107) is provided with a corresponding pressure roller shaft hole (108). The front stage pressure roller (161) is installed across the two pressure roller shaft holes (108). Each of the left and right printer frame plates used to install the front stage drive roller (162) is provided with a vertical strip hole (401). The two ends of the roller shaft of the front stage pressure roller (161) are placed in the vertical strip hole (401) on the corresponding side. The front stage left lifting plate (106) or the front stage right lifting plate (107) is connected to the front stage through a transmission connector, which can make the front stage left lifting plate (106) and the front stage right lifting plate (107) rise or fall synchronously.

2. The card printer of claim 1, wherein, The print height adjustment assembly (200) consists of a print level left lifting plate (205), a print level right lifting plate (206), and a print level for mounting the print head (141). The print level left lifting plate (205) and the print level right lifting plate (206) are respectively provided with a print head shaft hole (209) corresponding to each other. The print head (141) is mounted between the two print head shaft holes (209) by a print head side shaft (210) on its left and right sides. A vertical strip hole (401) is provided on each of the printer frame plates on the left and right sides for mounting the print drive roller (142). The end of the print head side shaft (210) is placed in the vertical strip hole (401) on the corresponding side. The print level left lifting plate (205) or the print level right lifting plate (206) is connected to the print level through a transmission connector, which can make the print level left lifting plate (205) and the print level right lifting plate (206) rise or fall synchronously.

3. The card printer of claim 1, wherein, The rear stage height adjustment assembly (300) consists of a rear stage left lifting plate (306), a rear stage right lifting plate (307), and a rear stage. Each of the rear stage left lifting plate (306) and the rear stage right lifting plate (307) is provided with a corresponding pressure roller shaft hole (108). The rear stage pressure roller (171) is installed across the two pressure roller shaft holes (108). Each of the left and right printer frame plates used to install the rear stage drive roller (172) is provided with a vertical strip hole (401). The two ends of the roller shaft of the rear stage pressure roller (171) are placed in the vertical strip hole (401) on the corresponding side. The rear stage left lifting plate (306) or the rear stage right lifting plate (307) is connected to the rear stage through a transmission connector, which can make the rear stage left lifting plate (306) and the rear stage right lifting plate (307) rise or fall synchronously.

4. The card printer of claim 3, wherein, The front left lifting plate (106), front right lifting plate (107), rear left lifting plate (306), rear right lifting plate (307), printing stage left lifting plate (205), and printing stage right lifting plate (206) have the same shape and structure. Each lifting plate consists of an integral upper and lower part. The upper part is rectangular or elliptical. The pressure roller shaft hole (108) or printing head shaft hole (209) is located in the upper part. The lower part is at least one support foot. The transmission connecting part consists of two parallel sliding plates (413) mounted on a slide rail that slide synchronously back and forth along the card conveying channel. Fixed on the frame plate, the top edge of the sliding plate (413) has a sawtooth 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 groove as the sliding plate (413) slides back and forth. In the sawtooth structure, the direction of the sawtooth corresponding to the front lifting plate is the same as the direction of the sawtooth corresponding to the rear lifting plate, and the direction of the sawtooth corresponding to the front lifting plate is opposite to the direction of the sawtooth corresponding to the printing plate. When the support feet on the front lifting plate and the rear lifting plate fall into the bottom of the corresponding tooth groove, the support feet on the printing plate fall into the top of the corresponding tooth groove.

5. The card printer of claim 4, wherein, The distance between the front leg (402) and the rear leg (403) of the front stage lifting plate is the same as the tooth pitch of the sawtooth 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 (413) and capable of driving the sliding plate (413) to move linearly and reciprocally.

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