Thermal transfer printer

Abstract

The utility model discloses a thermal transfer printer, which solves the problem that a traditional fixed-distance conveying structure cannot adapt to cards with different thicknesses through the fact that a second conveying roller in a first conveying assembly is movably arranged and is connected through an elastic assembly. The position of the second conveying roller can be automatically adjusted relative to the fixed first conveying roller, when cards with different thicknesses are inserted, the elastic assembly generates adaptive elastic force, it is ensured that the conveying rollers make close contact with the cards, the cards are prevented from slipping, and excessive extrusion deformation is prevented. Meanwhile, the guide groove is matched with the shaft sleeve, so that the stable movement of the second conveying roller is ensured, the printer can efficiently process cards of various thicknesses, the printing quality and the equipment adaptability are improved, and the operation complexity is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of printing equipment manufacturing, especially to a thermal transfer printer. BACKGROUND

[0002] The thermal transfer printer is a commonly used device in the field of certificate card printing, and is widely used in the manufacturing process of various certificate cards such as ID cards, membership cards and bank cards. The traditional thermal transfer printer usually adopts a fixed-pitch conveying roller group structure, which includes upper and lower conveying rollers fixedly arranged to clamp the certificate card and convey it to the printing head position for printing. However, with the diversification of the application scenarios of certificate cards, different thickness certificate card products have appeared on the market, from thin ordinary PVC cards to thick smart cards. The traditional fixed-pitch conveying roller group structure cannot effectively adapt to such thickness changes. When processing thicker certificate cards, the conveying roller clamping force may be insufficient, causing the card to slip. When processing thinner certificate cards, the clamping force may be too large, causing the card to deform or be damaged. In addition, the distance between the printing head and the certificate card of the traditional printer is usually fixedly arranged and cannot be automatically adjusted according to certificate cards of different thicknesses, thereby affecting the printing quality.

[0003] The above technical problems cause the traditional thermal transfer printer to be difficult to maintain stable printing effect when facing certificate cards of different thicknesses, reducing the universality and adaptability of the device and increasing the use cost and maintenance difficulty. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a thermal transfer printer capable of self-adapting to certificate cards of different thicknesses.

[0005] The utility model solves the technical problems by adopting the following technical scheme:

[0006] A thermal transfer printer for printing certificate cards, comprising: a first conveying assembly and a printing head; the first conveying assembly comprises a first conveying roller and a second conveying roller, the first conveying roller is located below and fixedly arranged as a driving roller, and the second conveying roller is located above and movably arranged as a driven roller; the second conveying roller is connected through an elastic assembly, so that the second conveying roller can move relative to the first conveying roller to adapt to certificate cards of different thicknesses and be clamped and conveyed to the printing head for printing.

[0007] Further, it comprises: two oppositely arranged vertical plates, the first conveying assembly and the printing head are arranged between the two vertical plates; the two ends of the first conveying roller are fixedly connected with the vertical plates; the vertical plates are provided with guide grooves, and the two ends of the second conveying roller are slidably arranged in the guide grooves; the elastic assembly acts on the two ends of the second conveying roller, so that the second conveying roller and the first conveying roller maintain the abutting state.

[0008] Further, the second conveying roller is provided with a shaft sleeve at both ends; the guide groove has oppositely arranged side walls which are mutually parallel vertical planes; the outer wall of the shaft sleeve is symmetrically provided with two parallel guide planes which are in sliding contact with the two side groove walls of the guide groove.

[0009] Further, the shaft sleeve is provided with an annular clamping groove at the end of the vertical plate, for limiting the radial displacement of the elastic assembly; the elastic assembly is a spiral torsion spring, both ends of which form an axially extending fixed arm and an abutting arm, respectively; the fixed arm is fixedly connected with the vertical plate, and the abutting arm is embedded in the annular clamping groove and abuts against the shaft sleeve; the middle section of the spiral torsion spring is wound into an annular elastic energy storage part, which provides self-adaptive clamping force through radial compression deformation.

[0010] Further, the print head is connected with the vertical plate through a rotatable support, which includes a transversely extending adjusting crossbar; the print head is fixed on the adjusting crossbar, and the vertical distance between the print head and the ID card is changed by rotating the adjusting crossbar, so as to adapt to ID cards of different thicknesses.

[0011] Further, it further comprises a loading platform arranged at the ID card inlet, which is used to receive the ID card to be printed; two laterally movable limiting parts are arranged on the loading platform, and the two limiting parts are oppositely arranged and form an ID card positioning channel; the limiting parts can slide relative to the loading platform, and the distance between the two limiting parts is adjusted to match the width of the ID card, so as to limit the horizontal position deviation of the ID card when entering the first conveying assembly.

[0012] Further, a transversely extending through groove is arranged on the loading platform, and a limiting column is fixed at the bottom of the limiting part, the limiting column passes through the through groove and is in sliding connection with the loading platform; the limiting column is in the form of a screw rod, and the lower end of the limiting column is provided with an abutting part with a diameter greater than the width of the through groove; the abutting part is in detachable locking cooperation with the bottom surface of the loading platform through screwing action, so as to fix the position of the limiting part.

[0013] Further, it further comprises a second conveying assembly arranged on the side of the print head away from the first conveying assembly; the second conveying assembly has the same structure as the first conveying assembly; the first conveying assembly and the second conveying assembly are synchronously driven, and are used to output the printed ID card in the conveying direction.

[0014] Further, it further comprises a driving mechanism in driving connection with the first conveying roller, which is used to drive the first conveying roller to rotate to convey the ID card.

[0015] Further, it further comprises a display screen arranged on the printer shell, which is in electrical connection with the main control module of the printer; the display screen is configured to display the printing parameters and receive user input, so as to adjust at least one of the following parameters: print head temperature, conveying speed or ID card type.

[0016] The utility model discloses a beneficial effect is:

[0017] The utility model provides a thermal transfer printer passes through the second transmission roll in first transmission subassembly is set up and is connected through the elasticity component, solved the problem that the traditional fixed pitch transmission structure cannot adapt to different thickness card, the second transmission roll can be relative to the fixed first transmission roll automatic adjustment position, when inserting different thickness card, the elasticity component produces adaptive elasticity, ensures the transmission roll and card close contact, both avoid the card slip, prevent excessive extrusion deformation. Meanwhile, the cooperation of guide groove and shaft sleeve guarantees the stable movement of second transmission roll, makes the printer can efficiently handle various thickness card, improves the printing quality and equipment adaptability, reduces the operation complexity. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further explained below in combination with the drawings and examples.

[0019] Figure 1 It is the three-dimensional structure schematic diagram of the utility model,

[0020] Figure 2 It is the internal structure schematic diagram of the utility model,

[0021] Figure 3 It is the side view structure schematic diagram of the utility model,

[0022] Figure 4 It is the section structure schematic diagram of the utility model,

[0023] Figure 5 It is the structure schematic diagram of the vertical plate of the utility model,

[0024] Figure 6 It is the utility model Figure 5 The enlarged view of A in the utility model.

[0025] Among them,

[0026] 100, vertical plate, 110, guide groove, 111, side wall,

[0027] 200, first transmission subassembly, 210, first transmission roll, 220, second transmission roll, 221, shaft sleeve, 2211, annular clamping groove, 2212, outer wall,

[0028] 300, second transmission subassembly,

[0029] 400, print head,

[0030] 500, adjusting cross bar,

[0031] 600, elasticity component,

[0032] 700, carrier; 710, through slot; 720, limiting part; 730, limiting column;

[0033] 800, housing; 810, display screen. DETAILED DESCRIPTION

[0034] The concept, specific structure and technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, all the connection / connection relationships involved in the patent do not mean that the components are directly connected, but that a better connection structure can be composed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present application can be interactively combined without mutual contradiction and conflict.

[0035] REFERENCE Figures 2-4 A thermal transfer printer for printing identification cards, comprising: a first conveying assembly 200 and a print head 400; the first conveying assembly 200 comprises a first conveying roller 210 and a second conveying roller 220, the first conveying roller 210 is fixedly arranged below as a driving roller, and the second conveying roller 220 is movably arranged above as a driven roller; the second conveying roller 220 is connected through an elastic assembly 600, so that the second conveying roller 220 can move relative to the first conveying roller 210 to adapt to identification cards of different thicknesses and be clamped and conveyed to the print head 400 for printing.

[0036] It can be understood that the thermal transfer printer of the present application realizes adaptive printing of identification cards of different thicknesses through the first conveying assembly 200. In the first conveying assembly 200, the first conveying roller 210 is fixedly arranged below as a driving roller and is drivingly connected with an external motor, and the second conveying roller 220 is movably arranged above as a driven roller. A card conveying channel is formed between the two conveying rollers. When identification cards of different thicknesses (such as ordinary PVC cards of 0.5 mm or smart cards of 0.8 mm) are put in, the second conveying roller 220 can move up and down under the action of the elastic assembly 600 to automatically adjust the distance between the second conveying roller 220 and the first conveying roller 210. The elastic assembly 600 is connected to the second conveying roller 220 and provides a downward pressure, so that the second conveying roller 220 can adaptively change the position according to the thickness of the card and always maintain close contact with the card, thereby ensuring that the card is stably clamped and smoothly conveyed to the print head 400 for thermal transfer printing. This structure design enables the printer to accurately process identification cards of various thickness specifications without the need for manual adjustment of equipment parameters by the operator.

[0037] In some embodiments, referring to Figures 2-5 , the first conveying assembly 200 and the print head 400 are arranged between the two upright plates 100; the two ends of the first conveying roller 210 are fixedly connected with the upright plates 100; the upright plates 100 are provided with guide grooves 110, and the two ends of the second conveying roller 220 are slidably arranged in the guide grooves 110; the elastic assembly 600 acts on the two ends of the second conveying roller 220, so that the second conveying roller 220 keeps in abutting state with the first conveying roller 210.

[0038] It can be understood that the two oppositely arranged upright plates 100 are used as the support structure, and the first conveying assembly 200 and the print head 400 are arranged between the two upright plates 100 to form a stable working frame. The first conveying roller 210 is used as the driving roller, and the two ends thereof are fixedly connected with the upright plates 100, so as to ensure the stability in the conveying process. In order to realize the adjustable feature of the second conveying roller 220, referring to Figure 3 , 5 , 6, the guide grooves 110 are specially designed on the upright plates 100, and the two ends of the second conveying roller 220 can slide in the guide grooves 110, so as to allow the second conveying roller 220 to freely move in the vertical direction. The elastic assembly 600 acts on the two ends of the second conveying roller 220, and continuously provides downward elastic force, so as to ensure that the second conveying roller 220 keeps in abutting state with the first conveying roller 210.

[0039] Of course, in use, referring to Figure 1 , the housing 800 is further arranged outside the support structure, for protecting the core components such as the conveying assembly, the print head 400 and the like inside, and preventing the interference of dust and external environment.

[0040] In some embodiments, referring to Figure 1 , 2 , the display screen 810 is further arranged on the printer housing 800, and the display screen 810 is electrically connected with the main control module of the printer; the display screen 810 is configured to display the printing parameters and receive the user input, so as to adjust at least one parameter of the temperature of the print head 400, the conveying speed or the card type. The intelligent level and the operation convenience of the thermal transfer printer are further improved, so that the operator can monitor and adjust the printing process in real time through the intuitive interface.

[0041] In some embodiments, a driving mechanism (not shown) is further included, which is in driving connection with the first conveying roller 210 for driving the first conveying roller 210 to rotate to convey the card. The driving mechanism is the power source of the conveying system of the thermal transfer printer, and through the driving connection with the first conveying roller 210, it ensures that the card can be smoothly moved to the printing position. The driving mechanism generally consists of a motor, a speed reducer and a transmission component, wherein the motor provides rotary power, the speed reducer adjusts the rotating speed to a range suitable for card conveying, and the transmission component accurately transmits the power to the first conveying roller 210. Parameters can be input through a display to control the driving mechanism, and the accurate control of the driving mechanism is combined with the height-adjustable mechanism of the present application, so that when the printer processes cards of different thicknesses, it can not only maintain a stable clamping force, but also maintain an accurate conveying speed, thereby realizing a high-quality thermal transfer printing effect.

[0042] In some embodiments, with reference to Figures 2-4 , a second conveying assembly 300 is further included, which is arranged on the side of the print head 400 away from the first conveying assembly 200;

[0043] The second conveying assembly 300 has the same structure as the first conveying assembly 200, and the first conveying assembly 200 and the second conveying assembly 300 are synchronously driven to output the printed card in the conveying direction. It can be understood that the first conveying assembly 200 and the second conveying assembly can be simultaneously driven through the driving assembly, so as to ensure that the card maintains a smooth and continuous movement during the entire printing process.

[0044] In some embodiments, with reference to Figure 2 , 4, two ends of the second conveying roller 220 are provided with shaft sleeves 221; the guide groove 110 has oppositely arranged side walls 111, and the two side walls 111 are vertical planes parallel to each other; outer walls 2212 of the shaft sleeves 221 are symmetrically provided with two parallel guide planes, and the parallel guide planes are in sliding contact with the two side groove walls of the guide groove 110. It can be understood that, in order to ensure that the second conveying roller 220 can keep an accurate track when moving up and down, the shaft sleeves 221 are arranged at the two ends of the second conveying roller 220, and the shaft sleeves 221 not only support the rotation of the second conveying roller 220, but also form a guide mechanism with the guide groove 110. The guide groove 110 is formed in the vertical plate 100 and has oppositely arranged side walls 111, and the two side walls 111 are vertical planes parallel to each other, forming an accurate track for the movement of the second conveying roller 220. The outer walls 2212 of the shaft sleeves 221 are symmetrically provided with two parallel guide planes, and the parallel guide planes are in sliding contact with the two side groove walls of the guide groove 110, ensuring that the second conveying roller 220 can only move in the vertical direction and cannot produce horizontal deviation. The shaft sleeves 221 stably move up in the guide groove 110, and the parallel guide planes are always in accurate contact with the side walls 111 of the guide groove 110, preventing the second conveying roller 220 from rotating or moving laterally. This accurate guidance ensures the stability of the card conveying and the accuracy of the printing position, thereby ensuring the quality of thermal transfer of cards of different thicknesses.

[0045] Further, with reference to Figure 2 , the shaft sleeves 221 protrude from the end of the vertical plate 100 and are provided with annular clamping grooves 2211 for limiting the radial displacement of the elastic assembly 600; the elastic assembly 600 is a spiral torsion spring, and two ends of the spiral torsion spring respectively form axially extending fixed arms and abutting arms; the fixed arms are fixedly connected with the vertical plate 100, and the abutting arms are embedded in the annular clamping grooves 2211 and abut against the shaft sleeves 221; a middle section of the spiral torsion spring is annularly arranged as an elastic energy storage part, and provides self-adaptive clamping force through radial compression deformation. It can be understood that the annular clamping grooves 2211 protruding from the end of the vertical plate 100 are arranged on the shaft sleeves 221, and are used for limiting the radial displacement of the elastic assembly 600 during work, so as to ensure that the elastic assembly 600 is always in the correct working position. The elastic assembly 600 adopts a spiral torsion spring structure, and two ends of the spiral torsion spring respectively form axially extending fixed arms and abutting arms. The fixed arms are fixedly connected with the vertical plate 100 to provide anchor point support, and the abutting arms are embedded in the annular clamping grooves 2211 at the end of the shaft sleeves 221 and abut against the shaft sleeves 221. Through this structural design, the spiral torsion spring can accurately transmit elastic force to the second conveying roller 220. The middle section of the spiral torsion spring is annularly arranged as an elastic energy storage part, and when cards of different thicknesses enter the conveying assembly, the annular energy storage part can adapt to the thickness change through radial compression deformation and provide self-adaptive clamping force.

[0046] In some embodiments, with reference to Figure 2 , 4 , the printing head 400 is connected to the vertical plate 100 through a rotatable support, which includes a laterally extending adjustment crossbar 500; the printing head 400 is fixed to the adjustment crossbar 500, and the vertical distance between the printing head 400 and the ID card is changed by rotating the adjustment crossbar 500 to adapt to ID cards of different thicknesses. The printing head 400 is connected to the vertical plate 100 through a rotatable support, so that the position of the printing head 400 can be adjusted as needed. The core component of the rotatable support is the laterally extending adjustment crossbar 500, and the printing head 400 is fixed to this adjustment crossbar 500. When the operator needs to adjust the position of the printing head 400, only the adjustment crossbar 500 needs to be rotated to change the vertical distance between the printing head 400 and the ID card, thereby achieving precise adaptation to ID cards of different thicknesses.

[0047] In some embodiments, considering the problem of precise positioning before printing of the ID card, a carrier 700 is arranged at the entrance of the ID card, with reference to Figures 1-4 , the carrier 700 is used to receive the ID card to be printed; the carrier 700 is provided with two laterally movable limiting parts 720, the two limiting parts 720 are oppositely arranged and form an ID card positioning channel; the limiting part 720 can slide relative to the carrier 700, and the distance between the two limiting parts 720 is adjusted to match the width of the ID card, so as to limit the horizontal position deviation of the ID card when entering the first conveying assembly 200. The two limiting parts 720 can slide relative to the carrier 700, and the operator can adjust the distance between the two limiting parts 720 according to the width of the actually used ID card, so as to accurately match the width of ID cards of different specifications. The limiting part 720 can be a limiting plate, a limiting block or the like structure, which can play the role of clamping the ID card.

[0048] Further, with reference to Figure 1 , the carrier 700 is provided with a laterally extending through slot 710, and the bottom of the limiting part 720 is fixed with a limiting column 730, with reference to Figure 3 , 4The limiting column 730 is in screw rod structure, and the lower end of the limiting column 730 is provided with an abutting portion with a diameter greater than the width of the through groove 710; the abutting portion is detachably locked with the bottom surface of the carrier 700 through screwing action to fix the position of the limiting portion 720. The through groove 710 provides a moving track for the precise adjustment of the limiting portion 720. The limiting column 730 passes through the through groove 710 and is in sliding connection with the carrier 700, so that the limiting portion 720 can freely move along the direction of the through groove 710 to adjust the width. The limiting column 730 is in screw rod structure, which not only provides strength guarantee, but more importantly, the lower end of the limiting column 730 is designed with an abutting portion with a diameter greater than the width of the through groove 710; the abutting portion does not pass through the through groove 710, but stays on the bottom surface of the carrier 700, and is detachably locked with the bottom surface of the carrier 700 through screwing action to fix the position of the limiting portion 720.

[0049] The above is a specific description of the preferred embodiment of the utility model, but the utility model is not limited to the described embodiment, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the present application.

Claims

1. A thermal transfer printer for printing identification cards, characterized by, Comprising: a first conveying assembly and a print head; the first conveying assembly comprises a first conveying roller and a second conveying roller, the first conveying roller is fixedly arranged as a driving roller, and the second conveying roller is movably arranged as a driven roller; the second conveying roller is connected by an elastic assembly, so that the second conveying roller can move relative to the first conveying roller to adapt to different thicknesses of the card and be clamped and conveyed to the print head for printing.

2. The heat transfer printer according to claim 1, characterized by Comprising: two opposite vertical plates, the first conveying assembly and the print head are arranged between the two vertical plates; the two ends of the first conveying roller are fixedly connected with the vertical plates; the vertical plates are provided with guide grooves, and the two ends of the second conveying roller are slidably arranged in the guide grooves; the elastic assembly acts on the two ends of the second conveying roller, so that the second conveying roller and the first conveying roller are in abutting state.

3. The heat transfer printer according to claim 2, wherein: the two ends of the second conveying roller are provided with shaft sleeves; the guide grooves have oppositely arranged side walls, and the two side walls are mutually parallel vertical planes; the outer wall of the shaft sleeve is symmetrically provided with two parallel guide planes, and the parallel guide planes are in sliding contact with the two side groove walls of the guide groove.

4. The heat transfer printer according to claim 3, wherein: the end of the shaft sleeve protruding from the vertical plate is provided with an annular clamping groove for limiting the radial displacement of the elastic assembly; the elastic assembly is a spiral torsion spring, and the two ends of the spiral torsion spring respectively form an axially extending fixed arm and an abutting arm; the fixed arm is fixedly connected with the vertical plate, and the abutting arm is embedded in the annular clamping groove and abuts with the shaft sleeve; the middle section of the spiral torsion spring is annularly arranged as an elastic energy storage part, and the self-adaptive clamping force is provided by radial compression deformation.

5. The heat transfer printer according to claim 2, wherein: the print head is connected with the vertical plate through a rotatable support, and the rotatable support comprises a transversely extending adjusting cross bar; the print head is fixed on the adjusting cross bar, and the vertical distance between the print head and the card is changed by rotating the adjusting cross bar to adapt to different thicknesses of the card.

6. The heat transfer printer according to claim 1, characterized by Further comprising: a loading table arranged at the card inlet, the loading table is used for receiving the card to be printed; the loading table is provided with two laterally movable limiting parts, and the two limiting parts are oppositely arranged and form a card positioning channel; the limiting parts are slidable relative to the loading table, and the spacing between the two limiting parts is adjusted to match the width of the card, so as to limit the horizontal position deviation of the card when entering the first conveying assembly.

7. The heat transfer printer according to claim 6, wherein: the loading table is provided with a transversely extending through groove, the bottom of the limiting part is fixed with a limiting column, and the limiting column passes through the through groove and is slidably connected with the loading table; the limiting column is a screw structure, and the lower end of the limiting column is provided with an abutting part with a diameter larger than the width of the through groove, and the abutting part is detachably locked with the bottom surface of the loading table by screwing action, so as to fix the position of the limiting part.

8. The heat transfer printer according to claim 1, further comprising: a second conveying assembly arranged on the side of the print head away from the first conveying assembly. The second conveying assembly has the same structure as the first conveying assembly; The first conveying assembly and the second conveying assembly are synchronously driven to output the printed card along the conveying direction.

9. The thermal transfer printer of claim 1, wherein: The drive mechanism is in driving connection with the first conveying roller to drive the first conveying roller to rotate to convey the card.

10. The thermal transfer printer of any one of claims 1-9, wherein: The display screen is electrically connected with the main control module of the printer; The display screen is configured to display printing parameters and receive user input to adjust at least one of the temperature of the print head, the conveying speed, or the type of card.

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