Signage Printer

Abstract

The present invention relates to a label printer, comprising a box body and a cover body, wherein a track fixing device, a carbon ribbon roll and a print head driving device are arranged in the box body; the print head driving device comprises a print head, a fixed bracket, a vertical plate, a driving bracket, a driving module and a return spring, wherein the print head is mounted on the fixed bracket, and a lifting sleeve is arranged on the fixed bracket, one end of the driving bracket is hinged on the vertical plate, and the lifting sleeve is placed on the driving bracket; the track fixing device comprises a base, a left guide rail and a right guide rail arranged on the base, and also comprises a movable baffle, a fixed baffle, a fixed plate, a gear, a first rack and a second rack. The present invention can realize that the position of the label is always kept in the center position, and the degree of automation is high. The up and down movement of the print head can be realized by the rotation of the motor, and the print head driving device is compact as a whole and has high reliability.

Description

Technical Field

[0001] The invention relates to a label printer. Background Art

[0002] At present, the print head of the sign printer is generally placed in the center relative to the sign conveying track. Therefore, the sign must also be placed in the center of the track during transportation to avoid skewed printing. In the prior art, the centering of the sign is achieved by two tracks, and the track is fixed by installing a screw in one of the tracks and placing a baffle at the bottom of the screw. When the track is moved to the desired position, the screw is tightened by hand to raise the baffle position to the point where the track and the conveying plane can be clamped to fix the track. The problem with this structure is that when the screw is tightened, the baffle will usually rotate synchronously with the screw and the track cannot be locked. At the same time, the locking screw needs to be turned multiple times to be tightened, and the entire operation is not very convenient.

[0003] The principle of the sign printer is to transfer the toner on the carbon ribbon to the sign by heating. Each time a sign is printed, the print head must be lifted once to allow the sign to pass, and at the same time it needs to be pressed down once to hold the sign and transfer the printed content to the sign.

[0004] The existing driving method of the print head of the sign printer is, which has the following disadvantages:

[0005] 1. Existing label machines all apply downward pressure on the print head through a spring, and the force application point is too single. Because the print head is required to have a swing of about 3°, the single-point force application makes the downward pressure of the print head in the downward pressure process not very stable; at the same time, the downward pressure applied by a single spring has high requirements for the life and fatigue strength of the spring. This structure distributes the downward pressure to two springs, which can make the applied force more stable and reduce the requirements for the life and fatigue strength of a single spring.

[0006] 2. The downward pressure of existing sign machines is directly applied to the drive structure through the cam, which has high requirements for the selection of motors. This mechanism uses the lever principle. The length of the force arm transmitted by the motor to the cam force application point is twice the length of the force arm at the drive point, which effectively reduces the driving force of the motor by half and reduces the requirements for the motor. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a label printer with a high degree of automation.

[0008] The technical solution adopted by the present invention to solve the technical problem is: construct a label printer, including a box body and a cover body, wherein a track fixing device, a carbon ribbon roll and a print head driving device are arranged in the box body;

[0009] The print head driving device comprises a print head, a fixed bracket, a vertical plate, a driving bracket, a driving module and a return spring, wherein the print head is mounted on the fixed bracket, a lifting sleeve is arranged on the fixed bracket, one end of the driving bracket is hinged on the vertical plate, the lifting sleeve is arranged on the driving bracket, the driving module comprises a motor, a gear set and a cam, the motor drives the cam to rotate through the gear set, the driving bracket is located on the rotation path of the cam, and the two ends of the return spring are respectively fixed on the vertical plate and the driving bracket;

[0010] The track fixing device includes a base, a left guide rail and a right guide rail arranged on the base, and also includes a movable baffle, a fixed baffle, a fixed plate, a gear, a first rack and a second rack. The fixed baffle is fixed on the right guide rail, the movable baffle is connected to the left guide rail through a locking mechanism, the first rack is fixedly connected to the left guide rail, the second rack is fixedly connected to the right guide rail, the first rack and the second rack are parallelly arranged on both sides of the gear, the first rack and the second rack are meshed with the gear, the gear, the first rack and the second rack are mounted on the fixed plate, and the fixed plate is fixed on the base.

[0011] In the above scheme, the locking mechanism includes a locking block and a rotating shaft. The head of the locking block passes through the base and the left guide rail and is connected to the movable baffle through the rotating shaft. The movable baffle rotates around the rotating shaft. When the movable baffle rotates to a vertical state, the part of the locking block located below the base presses upward on the surface of the base, thereby locking the left guide rail. When the movable baffle rotates to a horizontal state, the part of the locking block located below the base moves away from the base, and the locking state of the left guide rail is released.

[0012] In the above scheme, a protrusion is provided on the side of the movable baffle. When the movable baffle rotates to a horizontal state, the protrusion contacts the surface of the base. The distance between the axis of the rotating shaft and the protrusion surface is L1, and the distance between the axis of the rotating shaft and the lower end surface of the movable baffle is L2, L2>L1.

[0013] In the above solution, the first rack and the second rack are provided with strip-shaped holes, and the fixing plate is provided with positioning columns inserted into the strip-shaped holes.

[0014] In the above scheme, the base includes a left panel, a right panel and a top panel, and the first plug-in piece, the second plug-in piece, the third plug-in piece and the fourth plug-in piece are provided on both sides of the fixed plate, the first plug-in piece and the second plug-in piece are inserted into the bayonet of the left panel, and the third plug-in piece and the fourth plug-in piece are inserted into the bayonet of the right panel, the length of the first plug-in piece is smaller than the length of the second plug-in piece, and the length of the third plug-in piece is smaller than the length of the fourth plug-in piece.

[0015] In the above scheme, the print head is connected to the fixed bracket through the first fixed block, the second fixed block and the third fixed block, the print head is fixed to the first fixed block by screws, the first fixed block is connected to the second fixed block through two bearings and two sleeves, and the second fixed block is fixedly connected to the third fixed block by screws.

[0016] In the above solution, the third fixed block is fixedly connected to the slider, the slider is installed on the guide rail, the guide rail is fixed on the support plate, and the support plate is fixed on the vertical plate.

[0017] In the above solution, the third fixed block is fixedly connected to the fixed bracket, the lifting sleeve is arranged on the outside of the riveting shaft on the fixed bracket, and the lifting sleeve is fixed on the riveting shaft by a retaining spring.

[0018] In the above solution, the driving bracket is hinged to the vertical plate through the vertical plate shaft, and a retaining spring is provided at the end of the vertical plate shaft.

[0019] In the above solution, a lifting optical coupler is arranged on the vertical plate, and when the driving bracket moves to the lifting optical coupler, the motor stops rotating.

[0020] The label printer of the present invention has the following beneficial effects:

[0021] 1. The left track and the right track of the present invention realize equidistant synchronous movement through gear rack transmission, so the position of the sign can always be kept in the center, and the degree of automation is high.

[0022] 2. When the movable baffle rotates to the vertical state, the part of the locking block located below the base presses upward on the surface of the base, thereby locking the left rail, and the left and right rails cannot move; when the movable baffle rotates to the horizontal state, the part of the locking block located below the base moves away from the base, the locking state of the left rail is released, and the left and right rails can move to adjust the spacing. The locking function of the rail can be achieved by simply folding the movable baffle, which is easy to operate.

[0023] 3. The present invention converts the rotation of the cam into the swing of the driving bracket, and the driving bracket is connected to the fixed bracket. When the low point of the cam contacts the driving bracket, the print head is at the lowest point and presses the label; when the high point of the cam contacts the driving bracket, the print head is lifted. The present invention can realize the up and down movement of the print head through the rotation of the motor, and the print head driving device is compact as a whole and has strong reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0025] Figure 1 It is a structural schematic diagram of the label printer of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the label printer of the present invention;

[0027] Figure 3 It is a schematic diagram of the internal structure of the label printer of the present invention from another angle;

[0028] Figure 4 It is a schematic diagram of the back side of the internal structure of the label printer of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of the track fixing device;

[0030] Figure 6 This is a schematic diagram of the installation of the fixed plate;

[0031] Figure 7 It is a schematic diagram of a rack and pinion transmission;

[0032] Figure 8 is a schematic diagram of the movable baffle being in a horizontal state;

[0033] Fig. 9 It is a schematic diagram of the flipping process of the movable baffle;

[0034] Fig.10 It is a schematic diagram of the movable baffle and the fixed plate clamping the label;

[0035] Fig.11 It is a schematic diagram of the principle of the locking mechanism;

[0036] Fig.12 It is the front view of the movable baffle in the vertical state;

[0037] Fig.13 It is a front schematic diagram of a print head driving device of a sign printer of the present invention;

[0038] Fig.14 It is a schematic diagram of the back side of the print head driving device of the sign printer of the present invention;

[0039] Fig.15 is a schematic diagram of the driver module;

[0040] Fig.16 It is a schematic diagram when the print head is in the printing state;

[0041] Fig.17 This is a schematic diagram of the print head in a non-printing state. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0043] like Figure 1-17As shown, the label printer of the present invention comprises a box body 1 and a cover body 2. A track fixing device 3, a carbon ribbon roll 4 and a print head driving device 5 are arranged in the box body 1.

[0044] The printer rail fixing device 3 includes a base, a left guide rail 3-4, a right guide rail 3-5, a movable baffle 3-6, a fixed baffle 3-7, a fixed plate 3-8, a gear 3-11, a first rack 3-9 and a second rack 3-10.

[0045] In this embodiment, the base is a frame structure, which includes a left panel 3-2, a right panel 3-3 and a top panel 3-1. The first plug-in piece 3-15, the second plug-in piece 3-16, the third plug-in piece 3-17 and the fourth plug-in piece 3-18 are provided on both sides of the fixed plate 3-8. The first plug-in piece 3-15 and the second plug-in piece 3-16 are inserted into the bayonet of the left panel 3-2, and the third plug-in piece 3-17 and the fourth plug-in piece 3-18 are inserted into the bayonet of the right panel 3-3. The length of the first plug-in piece 3-15 is less than the length of the second plug-in piece 3-16, and the length of the third plug-in piece 3-17 is less than the length of the fourth plug-in piece 3-18, which plays a fool-proof role in the structure. The two sides of the fixed plate 3-8 are also connected to the left panel 3-2 and the right panel 3-3 respectively by screws 3-19.

[0046] The fixed baffle 3-7 is fixed to the right guide rail 3-5 by screws 3-20, and the movable baffle 3-6 is connected to the left guide rail 3-4 by a locking mechanism. The first rack 3-9 is fixedly connected to the left guide rail 3-4, and the second rack 3-10 is fixedly connected to the right guide rail 3-5. The first rack 3-9 and the second rack 3-10 are arranged parallel and opposite to each other on both sides of the gear 3-11, and the first rack 3-9 and the second rack 3-10 are meshed with the gear 3-11. The gear 3-11, the first rack 3-9 and the second rack 3-10 are installed on the fixed plate 3-8. The first rack 3-9 and the second rack 3-10 are provided with strip holes, and the fixed plate 3-8 is provided with positioning columns 3-14 inserted into the strip holes, and the moving paths of the first rack 3-9 and the second rack 3-10 are limited by the positioning columns 3-14. The first rack 3-9 and the second rack 3-10 have exactly the same specifications, and the left track and the right track achieve equidistant synchronous movement through rack and pinion transmission, so the position of the sign can always be kept in the center, with a high degree of automation.

[0047] The locking mechanism includes a locking block 3-13 and a rotating shaft 3-12. The head of the locking block 3-13 passes through the base and the left guide rail 3-4 and is connected to the movable baffle 3-6 through the rotating shaft 3-12. The movable baffle 3-6 rotates around the rotating shaft 3-12. When the movable baffle 3-6 rotates to a vertical state, the part of the locking block 3-13 located below the base presses upward on the surface of the base, and a certain amount of interference is generated between the top plate 3-1 of the base and the locking block 3-13, thereby locking the left guide rail 3-4. At this time, the right guide rail 3-5 cannot move. When the movable baffle 3-6 rotates to a horizontal state, the part of the locking block 3-13 located below the top plate 3-1 moves away from the top plate 3-1, and the locking state of the left guide rail 3-4 is released.

[0048] In this embodiment, a protrusion 3-21 is provided on the side of the movable baffle 3-6. When the movable baffle 3-6 rotates to a horizontal state, Fig.11 As shown, the protrusion 3-21 contacts the surface of the base, the distance between the axis of the shaft and the surface of the protrusion 3-21 is L1 = 5mm, the distance between the axis of the shaft and the lower end surface of the movable baffle 3-6 is L2 = 5.7mm, and L2-L1 = 0.7mm. When the movable baffle 3-6 rotates upward, the axis of the shaft, i.e., the center of rotation, will rise by 0.7mm, thereby pulling the locking block 3-13 to move upward by 0.7mm, so that a certain amount of interference is generated between the locking block 3-13 and the surface of the base, thereby locking the left guide rail 3-4, as shown in FIG. Fig.12 shown.

[0049] The print head driving device 5 includes a print head 5-1, a fixed bracket 5-3, a vertical plate 5-4, a driving bracket 5-13, a driving module and a return spring 5-15.

[0050] The print head 5-1 is installed on the fixed bracket 5-3, and a lifting sleeve 5-12 is provided on the fixed bracket 5-3. One end of the driving bracket 5-13 is hinged on the vertical plate 5-4, and the lifting sleeve 5-12 is placed on the driving bracket 5-13. The driving module includes a motor 5-18, a gear set and a cam 5-23. The motor 5-18 drives the cam 5-23 to rotate through the gear set. The driving bracket 5-13 is located on the rotation path of the cam 5-23, and the two ends of the return spring 5-15 are respectively fixed on the vertical plate 5-4 and the driving bracket 5-13. When the motor 5-18 rotates, it drives the cam 5-23 to rotate. The rotation of the cam 5-23 drives the driving bracket 5-13 to swing up and down. The driving bracket 5-13 is connected to the fixed bracket 5-3. When the low point of the cam 5-23 contacts the driving bracket 5-13, the print head 5-1 is at the lowest point and presses the sign. When the high point of the cam 5-23 contacts the driving bracket 5-13, the print head 5-1 is lifted and printing stops.

[0051] Further, the print head 5-1 is connected to the fixed bracket 5-3 through the first fixed block 5-5, the second fixed block 5-6 and the third fixed block 5-7. The print head 5-1 is fixed to the first fixed block 5-5 by screws, the first fixed block 5-5 is connected to the second fixed block 5-6 by two bearings 5-24 and two sleeves, and the second fixed block 5-6 is fixedly connected to the third fixed block 5-7 by screws. The third fixed block 5-7 is fixedly connected to the slider 8 by screws, the slider 5-8 is installed on the guide rail 5-9, the guide rail 5-9 is fixed to the support plate 5-10 by screws, and the support plate 5-10 is fixed to the vertical plate 5-4 by screws. The third fixed block 5-7 is also fixedly connected to the fixed bracket 5-3 by screws, and the lifting sleeve 5-12 is arranged on the outside of the riveting shaft on the fixed bracket 5-3, and the lifting sleeve 5-12 is fixed to the riveting shaft by a retaining spring.

[0052] Furthermore, the driving bracket 5-13 is hinged to the vertical plate 5-4 through the vertical plate shaft, and a retaining spring is provided at the end of the vertical plate shaft to limit the position.

[0053] Furthermore, a lifting optical coupler 5-11 is provided on the vertical plate 5-4. In the printing state, the driving bracket 5-13 is located at the lowest point of the cam 5-23. At this time, under the action of the return spring 5-15, the print head is also at the lowest point and presses the print rubber roller 5-2, so that printing can be performed. In the non-printing state, the cam 5-23 rotates, driving the driving bracket 5-13 to move upward, thereby lifting the print head 5-1. When the driving bracket 5-13 moves to the lifting optical coupler 5-11, the signal in the middle of the lifting optical coupler 5-11 is blocked, the motor 5-18 stops rotating, and the driving bracket 5-13 also stops. At this time, printing cannot be performed, and only the label is allowed to pass.

[0054] Furthermore, the gear set includes a first gear 5-19, a second gear 5-20, a third gear 5-21 and a fourth gear 5-22 which are meshed in sequence, the first gear 5-19 is connected to the motor 5-18, and the cam 5-23 is fixed on the output shaft of the fourth gear 22.

[0055] Furthermore, the motor 5-18 is mounted on the motor bracket 5-17, and the motor bracket 5-17 is fixed on the vertical plate 5-4.

[0056] Furthermore, a spring bracket 5-16 for mounting a return spring 5-15 is provided on the vertical plate 5-4.

[0057] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A label printer, comprising a box body and a cover body, characterized in that: The box body is provided with a track fixing device, a carbon ribbon roll and a print head driving device; The print head driving device comprises a print head, a fixed bracket, a vertical plate, a driving bracket, a driving module and a return spring, wherein the print head is mounted on the fixed bracket, a lifting sleeve is provided on the fixed bracket, one end of the driving bracket is hinged on the vertical plate, the lifting sleeve is placed on the driving bracket, the driving module comprises a motor, a gear set and a cam, the motor drives the cam to rotate through the gear set, the driving bracket is located on the rotation path of the cam, and the two ends of the return spring are respectively fixed on the vertical plate and the driving bracket; the motor is mounted on the motor bracket; The track fixing device comprises a base, a left guide rail and a right guide rail arranged on the base, and also comprises a movable baffle, a fixed baffle, a fixed plate, a gear, a first rack and a second rack, wherein the fixed baffle is fixed on the right guide rail, the movable baffle is connected to the left guide rail through a locking mechanism, the first rack is fixedly connected to the left guide rail, the second rack is fixedly connected to the right guide rail, the first rack and the second rack are arranged parallel and oppositely on both sides of the gear, the first rack and the second rack are meshed with the gear, the gear, the first rack and the second rack are mounted on the fixed plate, and the fixed plate is fixed on the base; The locking mechanism includes a locking block and a rotating shaft. The head of the locking block passes through the base and the left guide rail and is connected to the movable baffle through the rotating shaft. The movable baffle rotates around the rotating shaft. When the movable baffle rotates to a vertical state, the part of the locking block located below the base presses upward on the surface of the base, thereby locking the left guide rail. When the movable baffle rotates to a horizontal state, the part of the locking block located below the base moves away from the base, and the locking state of the left guide rail is released.

2. The label printer according to claim 1, characterized in that: The side of the movable baffle is provided with a protrusion. When the movable baffle rotates to a horizontal state, the protrusion contacts the surface of the base. The distance between the axis of the rotating shaft and the protrusion surface is L1, and the distance between the axis of the rotating shaft and the lower end surface of the movable baffle is L2, and L2>L1.

3. The label printer according to claim 1, characterized in that: The first rack and the second rack are provided with strip-shaped holes, and the fixing plate is provided with positioning columns inserted into the strip-shaped holes.

4. The label printer according to claim 1, characterized in that: The base includes a left panel, a right panel and a top panel, and a first plug-in sheet, a second plug-in sheet, a third plug-in sheet and a fourth plug-in sheet are provided on both sides of the fixed plate, the first plug-in sheet and the second plug-in sheet are inserted into the bayonet of the left panel, and the third plug-in sheet and the fourth plug-in sheet are inserted into the bayonet of the right panel, the length of the first plug-in sheet is smaller than the length of the second plug-in sheet, and the length of the third plug-in sheet is smaller than the length of the fourth plug-in sheet.

5. The label printer according to claim 1, characterized in that: The print head is connected to the fixed bracket through a first fixed block, a second fixed block and a third fixed block. The print head is fixed to the first fixed block by a screw. The first fixed block is connected to the second fixed block through two bearings and two sleeves. The second fixed block is fixedly connected to the third fixed block by a screw.

6. The label printer according to claim 5, characterized in that: The third fixed block is fixedly connected to the sliding block, the sliding block is installed on the guide rail, the guide rail is fixed on the support plate, and the support plate is fixed on the vertical plate.

7. The label printer according to claim 6, characterized in that: The third fixing block is fixedly connected to the fixing bracket, the lifting sleeve is arranged on the outer side of the riveting shaft on the fixing bracket, and the lifting sleeve is fixed on the riveting shaft through a retaining spring.

8. The label printer according to claim 5, characterized in that: The driving bracket is hinged to the vertical plate through a vertical plate shaft, and a clamping spring is arranged at the end of the vertical plate shaft.

9. The label printer according to claim 5, characterized in that: The vertical plate is provided with a lifting optical coupler, and when the driving bracket moves to the lifting optical coupler, the motor stops rotating.

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