A printer with camshaft drive

Abstract

The present invention provides a printer with a camshaft drive, which relates to the technical field of printing devices, including a print head assembly and a camshaft that drives multiple different workstations to work simultaneously, wherein the camshaft comprises a linkage shaft, a driving member that drives the linkage shaft to continuously rotate, and a first cam sleeved on the linkage shaft; the first cam continuously abuts against the lower end position of the print head assembly to synchronously drive the print head assembly to approach or move away from printing paper accordingly; and the outer peripheral surface of the first cam that rotates around the linkage shaft has multiple contact surfaces with different curvatures, and the print head assembly abuts against each of the contact surfaces, thereby reciprocating at different speeds, controlling the print head assembly to move up and down at different speeds during the printing process, thereby improving printing efficiency and printing accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of printing devices, and in particular to a printer with a camshaft drive. Background Art

[0002] When a thermal print head printer is working, it forms a printed image on the printing paper by pressing the print head against the ink ribbon and sublimating the ink coated on the ink ribbon. This type of thermal print head printer includes: a print head assembly, which has a print head. The print head assembly can move toward or away from the ink ribbon and the printing paper. The print head assembly moves between a printing position and a standby position, wherein at the printing position, the print head is pressed against the ink ribbon and the printing paper when printing, and at the standby position, the print head assembly is placed in a ready state before printing begins. Among them, the distance between the printing position and the standby position needs to be relatively short to ensure that the printing of the printing paper can be performed quickly. In existing thermal print head printers, a single drive cam is generally configured to enable the print head assembly to move relatively between the printing position and the standby position, correspondingly approaching or moving away from the printing paper.

[0003] However, when a single driving cam is used to move the print head assembly, a driving component such as a cam groove configured to move the print head assembly between the printing position and the standby position is in the single driving cam. This type of driving cam has a large profile and is therefore heavy, thereby slowing down the operation of the driving cam and affecting the printing efficiency of the printer during printing.

[0004] Furthermore, since the distance between the printing position and the standby position is short as mentioned above, using a single drive cam to move the print head mechanism therebetween causes another problem: when the print head mechanism moves between the printing position and the standby position, the convex portion of the cam controls the lifting and lowering movement of the print head assembly, presenting an up and down movement at an extreme lifting and lowering rate, causing the print head assembly to lift and move at a relatively sudden rate, which can easily cause damage to the print head assembly and affect printing accuracy. Summary of the invention

[0005] The invention discloses a printer with a camshaft drive, aiming to improve the problem of low printing efficiency and precision caused by the existing driving cam in the lifting and lowering movement of a printing head assembly.

[0006] The present invention adopts the following scheme:

[0007] A printer with a camshaft drive comprises a print head assembly and a camshaft that drives multiple different workstations to work simultaneously, the camshaft comprising a linkage shaft, a driving member that drives the linkage shaft to continuously rotate, and a first cam sleeved on the linkage shaft; the first cam continuously abuts against the lower end position of the print head assembly to synchronously drive the print head assembly to approach or move away from printing paper accordingly; and the outer peripheral surface of the first cam that rotates around the linkage shaft has multiple contact surfaces with different curvatures, and the print head assembly abuts against each of the contact surfaces, thereby moving back and forth at different speeds.

[0008] As a further improvement, the outer circumferential surface of the first cam rotating around the linkage shaft includes, in sequence: a low-point contact surface having a first curvature and abutting the bottom of the print head assembly to maintain a printing position, a rising contact surface having a first extended curvature and controlling the upward movement of the print head assembly, a high-point contact surface having a second curvature and abutting the bottom of the print head assembly to maintain a distance from the printing position, and a descending contact surface having a second extended curvature and controlling the descending movement of the print head assembly, so as to ensure that the print head assembly moves regularly under the drive of the first cam.

[0009] As a further improvement, the first arc and the second arc are both arc segments, and both have the axis of the linkage shaft as the center; the first extended arc and the second extended arc are irregular arcs, and the rising contact surface is connected to the starting end of the low-point contact surface and connected to the end of the high-point contact surface, and its distance from the axis of the linkage shaft gradually increases; the descending contact surface is connected to the starting end of the high-point contact surface and connected to the end of the low-point contact surface, and its distance from the axis of the linkage shaft gradually decreases.

[0010] As a further improvement, it also includes a pressing roller group and a read-write module, and the print head assembly, the pressing roller group, and the read-write module are respectively arranged along the print transmission path; the camshaft drives multiple workstations to work simultaneously, and includes a second cam, a driven gear and a third cam respectively mounted on the linkage shaft; the second cam drives the pressing roller group to make it linked with the print head assembly, corresponding to pressing and conveying the printing paper or relatively avoiding the printing paper; the driven gear is connected to an external driving member to enable the linkage shaft to rotate continuously; the third cam drives the read-write module to change from an initial position to a reading and writing position close to the printing paper conveyed to the read-write area; the print head assembly is close to the printing paper, corresponding to the pressing roller group relatively avoiding the printing paper, or the print head group is away from the printing paper, corresponding to the pressing roller group pressing and conveying the printing paper.

[0011] As a further improvement, the print head assembly includes an adjustment seat and a print head configured on the adjustment seat; the first cam abuts against the adjustment seat and rotates eccentrically relative to the linkage shaft to push the adjustment seat to move up and down, thereby changing the printing distance between the print head and the printing paper when in the printing state.

[0012] As a further improvement, the adjustment seat is provided with a guide sliding structure, which includes a guide column configured on the printer and arranged along the direction of driving the print head assembly to rise and fall, a bushing arranged on the adjustment seat and slidably sleeved on the guide column, and a buffer member sleeved on the guide column to provide downward thrust for the bushing.

[0013] As a further improvement, a base is provided along the printing transmission path, and the pressing roller group can be rotated on the base through a swinging piece, and the swinging piece is driven to rotate via a connecting rod; a slide groove is provided along the length direction of the base, and the connecting rod can be reciprocated in the slide groove, and the second cam pushes the connecting rod in the left and right directions to drive the connecting rod to move reciprocally along the slide groove, thereby causing the pressing roller group to press and transport or avoid the printing paper.

[0014] As a further improvement, the connecting rod is provided with a cavity that cooperates with the second cam, the second cam is accommodated in the cavity, the linkage shaft drives the second cam to rotate, and the convex part of the second cam abuts against the left and right inner walls of the cavity, thereby pushing the connecting rod to move left and right along the slide groove.

[0015] As a further improvement, the extension direction of the convex part of the second cam forms an angle with that of the first cam; the first cam lifts the print head assembly, corresponding to the pressing roller group to press and convey the printing paper, or the first cam moves the print head assembly downward, corresponding to the pressing roller group to avoid the printing paper; the read-write module is at an angle to the print transmission path, and the second cam is connected to the read-write module via a side push piece, thereby triggering the read-write module to rotate relatively and cover the printing paper, or return to an initial state.

[0016] As a further improvement, the side push member includes a push rod, a guide seat and a tension spring; the push rod is slidably mounted on the guide seat, and one end of the push rod is in contact with the convex portion of the third cam, and the other end is connected to the read-write module, driving the read-write module to rotate along the pushing direction of the push rod; the tension spring connects the guide seat and the push rod to provide a pulling force for the push rod to return to its initial position.

[0017] As a further improvement, a floating member is provided, which is located above the second cam, and the side push member is located on one side of the third cam. The convex portion of the second cam sequentially contacts the side push member and the floating member, causing delayed linkage.

[0018] As a further improvement, the angle between the extension direction of the convex portion of the third cam and the extension direction of the convex portion of the second cam is 90 degrees.

[0019] As a further improvement, a position detection device is provided on the first cam, which senses oppositely to the external photoelectric detection component to detect the initial position of the camshaft, and controls the transmission units on each camshaft to reach the desired working position through step control of the external driving component.

[0020] As a further improvement, the reading and writing module includes a card IC chip reading and writing module and a card radio frequency identification module to read and identify the IC chip and radio frequency tag on the printed card respectively.

[0021] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0022] The printer with camshaft drive of the present application is configured with a camshaft that drives multiple different stations to work simultaneously, and the first cam on the camshaft continuously contacts the lower end position of the print head assembly, so that it drives the print head assembly to move closer to or away from the printing paper accordingly. Among them, the outer peripheral surface of the first cam has multiple contact surfaces with different arcs, and then the lower end position of the print head assembly is acted on by each different contact surface, so as to drive the print head assembly to move back and forth relatively at different speeds, and control the print head assembly to move up and down at different speeds during the printing process, thereby improving the printing efficiency and printing accuracy.

[0023] Furthermore, by means of a camshaft composed of a first cam, a second cam, a driven gear and a third cam respectively sleeved on the linkage shaft body, and the camshaft driving multiple stations on the printer to work simultaneously, a driving member drives the linkage control between multiple different mechanisms, greatly improving the printing and transmission efficiency. Among them, the first cam abuts against the lower end position of the print head assembly, the second cam drives the pressing roller group to make it linked with the print head assembly, the driven gear is connected to the external driving member, and the third cam drives the read-write module to change its own position, so that the camshaft synchronously controls the relative independent movement between the print head assembly, the pressing roller group and the read-write module through different phases, and increases the printing and transmission efficiency under the continuous rotation of the linkage shaft body. At the same time, by the first cam abutting against the lower end position of the print head assembly, the print head assembly is synchronously driven to approach or move away from the printing paper, so that the print head can avoid when it is away from the printing paper to replace the printing paper or the carbon ribbon, and print when the print head is close to the printing paper.

[0024] Furthermore, the outer peripheral surface of the first cam rotating around the linkage shaft 1 includes: a low point contact surface, a rising contact surface, a high point contact surface and a descending contact surface in sequence, so as to ensure that the print head assembly moves regularly under the drive of the first cam. Among them, the first arc and the second arc corresponding to the low point contact surface and the high point contact surface are both arc segments, and both take the axis of the linkage shaft as the center of the circle. The first extension arc and the second extension arc corresponding to the rising contact surface and the descending contact surface are irregular arcs, and the distance between the rising contact surface and the axis of the linkage shaft gradually increases, and the distance between the descending contact surface and the axis of the linkage shaft gradually decreases, so that when the first cam rotates, the print head assembly corresponding to the low point contact surface remains in the printing position, moves up along the rising contact surface to the high point contact surface to remain at the high point position away from the printing position, and moves down through the descending contact surface to the low point contact surface to remain, and moves back and forth to avoid the influence of acceleration and deceleration on the position of the print head assembly during the rotation of the first cam.

[0025] Furthermore, the first cam is preferably an eccentric wheel, so that the eccentric setting of the first cam on the linkage shaft ensures that the print head assembly moves regularly under the eccentric drive of the first cam, replacing the existing driving cam to control the lifting and lowering movement of the print head assembly, avoiding the damage to the print head assembly and low printing accuracy caused by the sudden change of the lifting and lowering rate of the print head assembly by the driving cam. The first cam is eccentrically sleeved on the linkage shaft, and its eccentricity is 1 / 8 to 1 / 6 of the radius of the eccentric wheel, which further ensures that the distance between the print head assembly and the standby position is short. In a short distance, the eccentric setting of the first cam wheel realizes an eccentric transmission with a small change amplitude and uniform speed, so that the print head assembly can be lifted and lowered smoothly and efficiently.

[0026] Furthermore, the linkage shaft can be rotatably placed horizontally inside the printer, wherein the first cam, the second cam driven gear and the third cam are concentrated at one end of the linkage shaft, so that the transmission units on the camshaft (the first cam, the second cam, the driven gear and the third cam) are concentrated on the same side, thereby realizing a compact setting of the internal mechanism of the printer and facilitating user maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a cross-sectional view of a printer with a camshaft drive according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A cross-sectional view from another perspective;

[0030] Figure 3 is a schematic structural diagram of a camshaft of a printer driven by a camshaft according to an embodiment of the present invention;

[0031] Figure 4 yes Figure 3 Schematic diagram of the structure from another perspective;

[0032] Figure 5 yes Figure 3 Schematic diagram of the structure from other perspectives;

[0033] Figure 6 yes Figure 3 A schematic diagram of the structure of the first cam and the linkage shaft in other embodiments;

[0034] Figure 7 yes Figure 3 The schematic diagram of the structure of the first cam and the linkage shaft in this embodiment, wherein the direction of the arrow is the rotation direction of the linkage shaft;

[0035] Figure 8 is a schematic structural diagram of a printer with a camshaft drive according to an embodiment of the present invention;

[0036] Fig. 9 yes Figure 8 A partial enlarged view of the middle I area;

[0037] Fig.10 yes Figure 8 A cross-sectional view from another perspective;

[0038] Fig.11 yes Figure 8 Schematic diagram of the structure in the first perspective;

[0039] Fig.12 yes Figure 8 A schematic diagram of the structure at a second viewing angle;

[0040] Fig.13 yes Fig.10 A cross-sectional view from another perspective;

[0041] Fig.14 It is a schematic diagram of the structure between the base, the print head assembly, and the pressing roller assembly of a printer with a camshaft drive according to an embodiment of the present invention;

[0042] Fig.15 It is a schematic structural diagram between a base and a pressing roller group of a printer with camshaft drive according to an embodiment of the present invention;

[0043] Fig.16 yes Fig.15 Schematic diagram of the structure between the slide groove and the connecting rod of the middle base.

[0044] Icons: 1-print head assembly; 11-adjusting seat; 12-print head; 13-guide column; 14-bushing; 15-buffer; 2-pressing roller group; 21-swinging member; 22-connecting rod; 221-cavity; 222-protrusion; 23-compression spring; 3-reading and writing module; 31-hinge shaft; 32-transmission plate; 4-camshaft; 41-linkage shaft; 42-first cam; 421-low point contact surface; 422-rising contact surface; 4221-mutation section; 423-high point contact surface; 424-descending contact surface; 4241-buffer section; 43-second cam; 44-driven gear; 45-third cam; 5-base; 51-slide; 6-side push piece; 61-push rod; 62-guide seat; 63-tension spring; 7-floating member; 8-photoelectric detection component. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] Example

[0051] Combination Figures 1 to 10The present embodiment provides a printer with camshaft drive, including a print head assembly 1 arranged on a printing transmission path, a pressing roller group 2, a read-write module 3, and a camshaft 4 that drives multiple stations to work simultaneously. Among them, the camshaft 4 includes a linkage shaft body 41 and a first cam 42, a second cam 43, a driven gear 44, and a third cam 45 that are sequentially sleeved on the linkage shaft body 41. The first cam 42 continuously abuts against the lower end position of the print head assembly 1 to synchronously drive the print head assembly 1 to rise and fall along the printing transmission path to approach or move away from the printing paper. The second cam 43 drives the pressing roller group 2 to make it linked with the print head assembly 1, correspondingly pressing and conveying the printing paper or relatively avoiding the printing paper. The driven gear 44 is connected to an external driving member to keep the linkage shaft body 41 rotating. The third cam 45 drives the read-write module 3 to change from an initial position to a read-write position close to the printing paper conveyed to the reading and writing area. When the print head assembly approaches the printing paper, the corresponding pressing roller group 2 relatively avoids the printing paper, or when the print head assembly 1 moves away from the printing paper, the corresponding pressing roller group 2 presses and conveys the printing paper. It should be noted that the driven gear 44 can be connected to the external driving member through a chain, and the chain is arranged between the driven gear 44 and the output shaft gear of the external driving member to transmit the power to the driven gear 44, so that the linkage shaft 41 on which the driven gear 44 is arranged continues to rotate with the external driving member.

[0052] In this embodiment, the camshaft 4 is composed of the first cam 42, the second cam 43, the driven gear 44 and the third cam 45 respectively sleeved on the linkage shaft body 41, and the camshaft 4 drives multiple stations on the printer to work simultaneously, so that one driving member drives the linkage control between multiple different mechanisms, which greatly improves the printing and transmission efficiency. Among them, the first cam 42 abuts against the lower end position of the print head assembly 1, the second cam 43 drives the pressing roller group 2 to make it linked with the print head assembly 1, the driven gear 44 is connected to the external driving member, and the third cam 45 triggers the read-write module 3 to rotate and cover the printing paper transported to the reading and writing area, so that the camshaft 4 synchronously controls the relative independent movement between the print head assembly 1, the pressing roller group 2 and the read-write module 3 through different phases, and the printing and transmission efficiency is increased under the continuous rotation of the linkage shaft body 41. At the same time, the first cam 42 abuts against the lower end position of the print head assembly 1 to synchronously drive the print head assembly 1 to rise and fall in the vertical direction of the printing transmission path to approach or move away from the printing paper. The first cam 42 is disposed on the linkage shaft 41 , ensuring that the print head assembly 1 moves according to a set rule under the drive of the first cam 42 .

[0053] Specifically, the linkage shaft 41 is rotatably placed horizontally inside the printer, and the first cam 42, the second cam 43, the driven gear 44 and the third cam 45 are concentrated at one end of the linkage shaft 41. Both ends of the linkage shaft 41 are rotatably supported and configured on the printer, and the shaft is horizontally arranged inside the printer. The first cam 42, the second cam 43, the driven gear 44 and the third cam 45 are concentrated on the same side of the linkage shaft 41, the first cam 42 is located near one end of the linkage shaft 41, and the third cam 45 is located near the midpoint of the linkage shaft 41 and is located on the same side of the shaft as other transmission units, so that the transmission units on the camshaft 4 are concentratedly arranged, ensuring the compact arrangement of the internal mechanisms of the printer.

[0054] In other embodiments, the first cam 42 is an eccentric wheel, so that the first cam 42 is eccentrically arranged on the linkage shaft 41, ensuring that the print head assembly 1 moves regularly under the eccentric drive of the first cam 42, replacing the existing driving cam to control the lifting and lowering movement of the print head assembly, avoiding the damage to the print head assembly and low printing accuracy caused by the sudden change of the lifting and lowering rate of the print head assembly by the driving cam. And the eccentricity of the first cam 42 ranges from 1 / 8 to 1 / 6 of the radius of the eccentric wheel 42. The linkage shaft 41 is passed through the eccentric point of the first cam 42 and relatively fixed to the first cam 42, so that the first cam 42 rotates to synchronously drive the first cam 42 to rotate eccentrically around its eccentric point, so as to abut against the lower end of the support print head assembly 1 to lift it up and down, and move between the printing position and the standby position. Among them, the definitions are: the eccentric distance d of the first cam 42, the radius r of the first cam 42, the distance between the print head assembly 1 at the printing position and the standby position is 2d, and d=(1 / 8~1 / 6)r, which further ensures that the distance between the print head assembly 1 at the printing position and the standby position is short, and in the shorter distance, the eccentric setting of the first cam 42 is used to achieve eccentric transmission with a small variation amplitude and uniform rate, so that the print head assembly 1 can be lifted and lowered smoothly and efficiently.

[0055] See also Figure 1 , Figure 2 , Figure 7 , Figure 8 and Fig. 9 The print head assembly 1 includes an adjustment seat 11 and a print head 12 disposed on the adjustment seat 11. The first cam 42 abuts against the bottom of the adjustment seat 11 and rotates relative to the linkage shaft 41 to push the adjustment seat 11 to move up and down, thereby changing the state of the print head 12 switching between the printing state and the state away from the printing position.

[0056] Furthermore, the outer circumference of the first cam 42 rotating around the linkage shaft 41 has a plurality of contact surfaces with different curvatures, and the print head assembly abuts on each contact surface, thereby reciprocating at different speeds. Among them, the outer circumference of the first cam 42 rotating around the linkage shaft 41 sequentially includes: a low point contact surface 421 having a first curvature and abutting the bottom of the print head assembly 1 to maintain the printing position, a rising contact surface 422 having a first extended curvature and controlling the upward movement of the print head assembly, a high point contact surface 423 having a second curvature and abutting the bottom of the print head assembly to maintain the high point away from the printing position, and a descending contact surface 424 having a second extended curvature and controlling the downward movement of the print head assembly, so as to ensure that the print head assembly 1 moves regularly under the drive of the first cam 42.

[0057] Specifically, the first arc and the second arc are both arc segments, and both have the axis of the linkage shaft body 41 as the center. Definition: The radius of the low point contact surface is r2, the radius of the high point contact surface is r1, and r2<r1. The first extended arc and the second extended arc are irregular arcs, and the distance between the rising contact surface 422 and the axis of the linkage shaft body 41 gradually increases from the starting end connected to the low point contact surface 421 to the end connected to the high point contact surface 423. The descending contact surface 424 gradually decreases its distance from the axis of the linkage shaft 41 from the starting end connected to the high point contact surface 423 to the tail end connected to the low point contact surface 421, so that when the first cam 42 rotates, the corresponding low point contact surface of the print head assembly 1 is maintained at the printing position, and moves up along the rising contact surface to the high point contact surface to be maintained at a high point position away from the printing position, and then moves down via the descending contact surface to be maintained at the low point contact surface, and moves back and forth to avoid the influence of acceleration and deceleration on the position of the print head assembly 1 during the rotation of the first cam 42. The ascending contact surface 423 and the descending contact surface 421 are respectively arranged as two arc segments with the axis of the linkage shaft 41 as the center, wherein the radius of the high point holding segment is r1, the radius of the low point holding segment is r2, and the distance between the printing position and the standby position of the print head assembly 1 is d (not shown), and d<(r1-r2). Since it is necessary to ensure that the print head assembly 1 is in the printing position, the print head assembly 1 must be in a suspended state to facilitate the printing control of the print head 12 on the printing paper.

[0058] Furthermore, the rising contact surface 422 and the descending contact surface 424 are both configured as multi-segment curves. In this embodiment, the rising contact surface 422 has a sudden change section 4221, and the sudden change section 4221 is disposed close to the high point contact surface 423. Along the rotation direction of the first cam 42, the axial distance between the sudden change section 4221 and the linkage shaft 41 instantly increases to approach r1, so as to quickly ascend and move, avoid interfering with the movement of the printing paper, and reduce the printing waiting time, so as to meet the requirement that the print head assembly 1 quickly ascends to the printing waiting position when ascending, and then maintains at a position away from the printing position. The descending contact surface 424 has a buffer section 4241, and the buffer section 4241 is disposed close to the low point contact surface 421. Along the rotation direction of the first cam 42, the axial distance between the buffer section 4241 and the linkage shaft 41 gradually decreases slowly to approach r2, so as to control the slow descending movement of the print head 12 and reduce the impact of the lifting and lowering movement on the print head assembly 1, so as to meet the requirement that the print head assembly 1 reaches the printing waiting position at a slower speed when descending, and then cooperates with the movement of the printing paper to quickly press down to the printing position.

[0059] In this embodiment, the adjustment seat 11 is configured to be lifted up and down inside the printer, which can be achieved by providing a guide sliding structure. The guide sliding structure includes a guide column 13 configured in the printer and arranged along the lifting direction of the print head assembly 1, a bushing 14 provided on the adjustment seat 11 and slidably sleeved on the guide column 13, and a buffer 15 sleeved on the guide column 13 to provide a downward thrust for the bushing 14. Under the abutment drive of the first cam 42 and the elastic pressing action of the buffer 15, the adjustment seat 11 is lifted and moved along the direction of the guide column 13 through the bushing 14, and is elastically configured inside the printer to cooperate with the adjustment seat 11 to lift and move relative to the printer under the abutment action of the first cam 42, correspondingly away from or close to the printing paper. The adjustment seat 11 is slidably arranged along the printing direction, and is sleeved with the buffer 15. The buffer 15 provides a buffering force for the adjustment seat 11 when it moves up and down. In this embodiment, driven by the rotation of the first cam 42, the print head assembly 1 moves up and down along the eccentric rotation direction of the first cam 42, thereby driving the adjustment seat 11 to move up and down synchronously, and the buffer 15 is used to buffer the entire print head assembly 1 moving up and down, thereby ensuring the stability of the moving process. Preferably, the buffer 15 is a spring, and at least two guide posts 13 are provided, and the buffer 15 and the bushing 14 are both provided in conjunction with the guide post 13.

[0060] See also Fig. 9 , Fig.14 , Fig.15 and Fig.16A base 5 is provided along the printing transmission path, and the pressing roller group 2 can rotate on the base 5 through the swing member 21, and the swing member 21 is driven to rotate through the connecting rod 22. A slide groove 51 is provided along the length direction of the base 5, and the connecting rod 22 can be reciprocated and placed in the slide groove 51. The second cam 43 pushes the connecting rod 22 in the left and right directions to drive the connecting rod 22 to reciprocate along the slide groove 51, correspondingly making the pressing roller group 2 press and transport or avoid away from the printing paper.

[0061] Specifically, the connecting rod 22 is provided with a cavity 221 that matches the second cam 43, and the second cam 43 is accommodated in the cavity 221. The upper width and lower width of the cavity 221 relative to the linkage shaft 41 are both greater than the length of the convex portion of the second cam 43, and the left width and right width of the cavity 221 are both less than the length of the convex portion of the second cam 43, so that during the rotation of the second cam 43, the second cam 43 avoids the cavity 221 wall in the upper and lower directions of the cavity 221, and abuts against one of the cavity 221 walls in the left and right directions of the cavity 221 to drive the connecting rod 22 to move left and right in the slide groove 51. The linkage shaft 41 drives the second cam 43 to rotate, and the convex portion of the second cam 43 abuts against the left and right inner walls of the cavity 221, thereby pushing the connecting rod 22 to move left and right along the slide groove 51. Among them, a protrusion 222 is provided at the end of the connecting rod 22, and the protrusion 222 is always in abutment with the swinging member 21, so that when the connecting rod 22 moves left and right, it drives the swinging member 21 to swing up and down, so that the pressing roller group 2 configured on the swinging member 21 moves up and down accordingly, and is linked with the print head assembly 1 to cooperate with the print head 12 to abut and transport or relatively avoid the printing paper. It should be noted that one end of the swinging member 21 is hinged on the base 5, and the other end is abutted against the protrusion 222 of the connecting rod 22 between the base 5 through the compression spring 23, and the pressing roller group 2 is connected to the abutting end of the swinging member 21 and is horizontally configured on the base 5 to realize hinged swing relative to the base 5, so as to move roughly up and down in the transmission path, correspondingly approaching or moving away from the printing paper.

[0062] In this embodiment, the camshaft 4 is used to realize the mutual linkage between the pressing roller group 2 and the print head assembly 1. The second cam 43 and the first cam 42 are respectively fixedly sleeved on the linkage shaft 41, and the extension direction of the convex part of the second cam 43 is arranged at a certain angle with the first cam 42 to control the coordinated action of the pressing roller group 2 and the print head 12. The first cam 42 lifts up the print head assembly 1, and the corresponding pressing roller group 2 presses and conveys the printing paper, or the first cam 42 moves down the print head assembly 1, and the corresponding pressing roller group 2 avoids and moves away from the printing paper. When printing the printing paper, the linkage shaft 41 rotates to drive the first cam 42 to rotate and move down the print head assembly 1, so that the print head 12 presses against the ink ribbon and the printing paper, and the print head assembly 1 is in the printing position. The second cam 43 synchronously drives the connecting rod 22 to move along the left side of the slide slot 51, and the protrusion 222 drives the swinging member 21 to rotate along its hinged end, so that the pressing roller group 2 is away from the printing paper. At this time, the print head 12 presses against the printing paper to achieve printing. At the end of printing, the linkage shaft 41 rotates to drive the first cam 42 to rotate to lift the print head assembly 1, so that the print head 12 is away from the printing paper, and the print head assembly 1 is in the standby position. The second cam 43 synchronously drives the connecting rod 22 to move along the right side of the slide slot 51, and the protrusion 222 drives the swinging member 21 to rotate along its hinged end, so that the pressing roller group 2 abuts against the printing paper to press and transport the printing paper to the next station on the printing transmission path.

[0063] See also Fig.10 , Fig.11 , Fig.12 and Fig.13 , the read-write module 3 is at an angle to the print transmission path, and the third cam 45 is connected to the read-write module 3 via the side pusher 6, thereby triggering the read-write module 3 to rotate relatively close to the printing paper in the read-write position, or return to the initial position. When the read-write module 3 is in the initial position, it is tilted relative to the printing transmission path, so that the read-write module 3 and the printing transmission path in a relatively flat state are at an opening. The third cam 45 rotates until its convex part pushes the side pusher 6, driving the side pusher 6 to move, thereby driving the read-write module 3 to rotate toward the printing paper located in the read-write area to complete the reading and writing of the printing paper. Preferably, the read-write module 3 includes a card IC chip read-write module and a card radio frequency identification module, which read and identify the IC chip and radio frequency tag on the printing card respectively. The IC chip is readable and writable, has a large capacity, has an encryption function, reliable data recording, and is more convenient to use. Radio frequency tag identification is a wireless communication technology that can identify a specific target and read and write related data through radio signals without establishing mechanical or optical contact between the identification system and the specific target.

[0064] Specifically, the side push member 6 includes a push rod 61, a guide seat 62 and a tension spring 63. The push rod 61 is slidably sleeved on the guide seat 62, and one end thereof contacts the convex portion of the third cam 45, and the other end is connected to the read-write module 3, driving the read-write module 3 to rotate along the pushing direction of the push rod 61. The tension spring 63 connects the guide seat 62 and the push rod 61 to provide a pulling force for the push rod 61 to return to the initial position. The read-write module 3 has a hinge shaft 31, which is rotatably arranged inside the printer to move the read-write module 3 from an initial position with an opening with respect to the printing transmission path to a read-write position covering the plane of the read-write area. The read-write module 3 extends downward with a transmission plate 32, which is hingedly connected to one end of the push rod 61, and moves along the direction of the guide seat 62 under the contact and push of the third cam 45 via the push rod 61, thereby driving the read-write module 3 to cover the printing paper located in the read-write area downward along the hinge shaft 31. When the convex portion of the third cam 45 is away from the push rod 61 , the push rod 61 returns to the initial position under the pulling of the tension spring 63 , thereby driving the transmission plate 32 to move relatively, so that the read-write module 3 returns to the initial position.

[0065] See also Fig.10 and Fig.13 , a floating member 7 is also provided. The floating member 7 is correspondingly arranged above the third cam 45, and the side push member 6 is located on one side of the third cam 45, and the convex part of the third cam 45 sequentially contacts the side push member 6 and the floating member 7, so that they are delayed and linked. In the present embodiment, the floating member 7 is plate-shaped and is arranged relatively parallel to the print conveying end face. One end of the floating member 7 is hinged on the base 5, and the upper end face of the other end is connected to the base 5 through a spring, and the lower end face contacts the convex part of the third cam 45, thereby driving the floating member 7 to rotate along the hinged end to float relatively. The floating member 7 can float and rotate along the lower end of the print conveying path, thereby driving the conveying roller arranged on the upper end face of the floating member 7 to move up and down relatively, so as to adjust the spacing between the upper and lower conveying rollers for conveying printing paper. In addition, a card magnetic stripe reading and writing module (not shown) is provided on the upper end surface of the floating member 7 away from the hinged end, and the third cam 45 abuts against the floating plate 7 to drive the floating member 7 to rotate close to the printing paper conveying end surface for reading the magnetic stripe information of the printing card in the printing state.

[0066] See also Figure 4 and Figure 5 The extension direction of the convex part of the third cam 45 forms a certain angle with the extension direction of the convex part of the second cam 43. The first cam 42, the second cam 43 and the third cam 45 are arranged at a certain angle in sequence to drive multiple workstations to work simultaneously. The various transmission units configured on the camshaft 4 ensure the relative synchronous linkage between different mechanisms.

[0067] Furthermore, a position detection device (not shown) is provided on the first cam, which is connected to an external photoelectric detection component 8 (such as Fig.12 The photoelectric detection component 8 is used to detect the rotation of each transmission unit in the camshaft 4, ensuring the transmission accuracy of the first cam 42, the second cam 43 and the third cam 45 during the rotation process, and effectively avoiding the transmission deviation of the camshaft 4.

[0068] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A printer with a camshaft drive, characterized in that: It includes a print head assembly and a camshaft that drives multiple different workstations to work simultaneously, wherein the camshaft includes a linkage shaft, a driving member that drives the linkage shaft to continuously rotate, and a first cam sleeved on the linkage shaft; The first cam continuously abuts against the lower end position of the print head assembly to synchronously drive the print head assembly to move closer to or away from the printing paper; and the outer peripheral surface of the first cam rotating around the linkage shaft has a plurality of contact surfaces with different curvatures, and the print head assembly abuts against each of the contact surfaces, thereby reciprocating at different speeds.

2. The printer according to claim 1, characterized in that: The contact surfaces are sequentially arranged on the outer peripheral surface of the first cam along the rotation direction of the linkage shaft, and the contact surfaces include: a low-point contact surface having a first curvature and abutting the bottom of the print head assembly to maintain a printing position, a rising contact surface having a first extended curvature and controlling the upward movement of the print head assembly, a high-point contact surface having a second curvature and abutting the bottom of the print head assembly to maintain a position away from the printing position, and a descending contact surface having a second extended curvature and controlling the downward movement of the print head assembly, so as to ensure that the print head assembly moves regularly under the drive of the first cam.

3. The printer according to claim 2, characterized in that: The first arc and the second arc are both arc segments, and both have the axis of the linkage shaft as the center; the first extended arc and the second extended arc are irregular arcs, and the rising contact surface is connected to the starting end of the low-point contact surface and connected to the end of the high-point contact surface, and its distance from the axis of the linkage shaft gradually increases; the descending contact surface is connected to the starting end of the high-point contact surface and connected to the end of the low-point contact surface, and its distance from the axis of the linkage shaft gradually decreases.

4. The printer according to claim 1, characterized in that: It also includes a pressing roller group and a read-write module, and the print head assembly, the pressing roller group, and the read-write module are arranged along the printing transmission path respectively; the cam shaft drives multiple stations to work simultaneously, and includes a second cam, a driven gear, and a third cam respectively sleeved on the linkage shaft body; wherein, The second cam drives the pressing roller group to move in conjunction with the print head assembly, correspondingly pressing and conveying the printing paper or relatively avoiding the printing paper; The driven gear is connected to an external driving member so that the linkage shaft body rotates continuously; The third cam drives the read-write module to change from an initial position to a read-write position close to the printing paper transported to the read-write area; When the print head assembly is close to the printing paper, the pressing roller group relatively avoids the printing paper, or when the print head assembly is far away from the printing paper, the pressing roller group presses and conveys the printing paper.

5. The printer according to claim 1, characterized in that: The print head assembly includes an adjustment seat and a print head disposed on the adjustment seat; the first cam abuts against the adjustment seat and relatively pushes the adjustment seat to move up and down, thereby changing the printing distance between the print head and the printing paper when in a printing state.

6. The printer according to claim 5, characterized in that: The adjustment seat is provided with a guide sliding structure, which includes a guide column configured on the printer and arranged along the direction of driving the print head assembly to rise and fall, a bushing arranged on the adjustment seat and slidably sleeved on the guide column, and a buffer member sleeved on the guide column to provide downward thrust for the bushing.

7. The printer according to claim 4, characterized in that: A base is provided along the printing transmission path, and the pressing roller group can be rotated on the base through a swinging piece, and the swinging piece is driven to rotate via a connecting rod; a slide groove is provided along the length direction of the base, and the connecting rod can be reciprocated in the slide groove, and the second cam pushes the connecting rod in the left and right directions to drive the connecting rod to move reciprocally along the slide groove, so that the pressing roller group presses and transports or avoids the printing paper.

8. The printer according to claim 7, characterized in that: The connecting rod is provided with a cavity matched with the second cam, the second cam is accommodated in the cavity, the linkage shaft drives the second cam to rotate, and the convex part of the second cam abuts against the left and right inner walls of the cavity, thereby pushing the connecting rod to move left and right along the sliding groove.

9. The printer according to claim 4, characterized in that: The extension direction of the convex part of the second cam forms an angle with that of the first cam; the first cam lifts up the print head assembly, corresponding to the pressing roller group to press and convey the printing paper, or the first cam moves down the print head assembly, corresponding to the pressing roller group to avoid and move away from the printing paper; the read-write module forms an angle with the printing transmission path, and the third cam is connected to the read-write module via a side push piece, thereby driving the read-write module to rotate relatively to the read-write position covering the printing paper, or return to the initial state.

10. The printer according to claim 9, characterized in that: The side push member includes a push rod, a guide seat and a tension spring; the push rod is slidably mounted on the guide seat, and one end of the push rod is in contact with the convex portion of the third cam, and the other end is connected to the read-write module, driving the read-write module to rotate along the pushing direction of the push rod; the tension spring connects the guide seat and the push rod to provide a pulling force for the push rod to return to its initial position.

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