CN116945780A - thermal printer core - Google Patents

Abstract

A thermal printer core, including a first body and a second body. The aforementioned first body is detachably installed on the second body through a detachment mechanism. The aforementioned first body, first frame, rubber roller assembly and fixed knife , the aforementioned rubber roller is rotatably mounted on the first frame, the aforementioned fixed knife is mounted on the first frame; the aforementioned second body includes a second frame and a thermal printer mounted on the second frame The head, the movable knife assembly, the first transmission gear set and the detachment mechanism are characterized in that one side of the second frame is rotatably provided with a swing bar, the top of the swing bar can offset the movable knife assembly and drive the movable knife The component is translated back into place; the detachment mechanism includes a rotating shaft, a wrench and a first reset piece. When paper is jammed, press the wrench to separate the first body and the second body. At the same time, the swing rod acts on the movable knife assembly, causing the movable knife assembly to move back quickly at the same time. The movable knife assembly and the fixed knife are instantly separated, completely releasing the problem. Paper jam prevents the movable knife component from being unable to return and causing functional failure.

Description

thermal printer core

Technical field

The invention relates to a printing device, in particular to a thermal printer core.

Background technique

Existing thermal printers generally include a base frame, a motor, a transmission gear assembly, a print head assembly, and a rubber roller that is rotatably mounted on the base frame. The power input end of the transmission gear assembly meshes with the active output gear of the motor, and the power output The end of the rubber roller meshes with the rubber roller gear located at the end of the rubber roller. The rubber roller is used to drive the printing paper to move. There is a paper feed channel between the rubber roller and the print head assembly. The print head assembly generally includes a print head (TPH, Thermal Print for short). Head), print head bracket, compression spring and compression spring support frame. The print head is located on the print head bracket. Both ends of the compression spring support frame are located at both ends of the base frame. The two ends of the compression spring are respectively connected with the print head bracket and compression spring. The support frames are offset so that the print head can press the printing paper tightly against the surface of the rubber roller. When loading or correcting printing paper, this is usually achieved by disassembling the rubber roller. There are usually two bearings at both ends of the rubber roller. The base frame has a groove for the bearing. The groove is semicircular. The bearing is in working condition. It is always located in the groove; when paper needs to be loaded, the rubber roller connecting bearing can be easily disengaged from the groove. However, there are the following shortcomings: the bearing moves greatly in the groove, which affects the normal operation of the rubber roller.

The applicant has applied for a thermal printer, see the Chinese invention patent "Thermal Printer" with patent number ZL201710535432.6 (authorization announcement number is CN107310276B). In this patent, when the printing paper is loaded or needs to be corrected, just Gently pull the handle, and the mounting frame will spring away from the base frame. At the same time, the first and second ornaments will instantly act on the fixed knife. The fixed knife will sink in the vertical direction, reducing the contact angle between the moving knife blade and the fixed knife blade. pressure to relieve the resistance of the moving knife to return to position, so that the moving knife can return to position smoothly. However, in actual use, if the paper that is constantly being cut is stuffed between the contact surfaces of the movable knife and the fixed knife (usually called a paper jam), it is difficult to reduce the impact of the jammed paper on the movable knife by sinking the fixed knife. The resistance of the position causes the movable knife to be unable to retreat and the function fails.

Contents of the invention

The technical problem to be solved by the present invention is to provide a thermal printer core that can return the moving knife assembly quickly after paper jam in view of the above-mentioned technical status quo.

The technical solution adopted by the present invention to solve the above technical problems is: a thermal printer core, which includes a first body and a second body. The aforementioned first body is detachably installed on the second body through a detachment mechanism. The aforementioned third body A first frame of the machine body, a rubber roller assembly and a fixed knife. The aforementioned rubber roller is rotatably installed on the first frame, and the aforementioned fixed knife is installed on the first frame;

The aforementioned second body includes a second frame and a thermal print head, a moving knife assembly, a first transmission gear set and a detachment mechanism located on the second frame. There are rubber roller assemblies on both sides of the front end of the aforementioned second frame. set groove;

The aforementioned movable knife assembly is movably disposed on the second frame and has a rack portion at least one end. The movable knife assembly cooperates with the aforementioned fixed knife to complete paper cutting; the aforementioned first transmission gear set is disposed on one side of the second frame. , the output gear of the first transmission gear set meshes with the rack portion on one side of the movable knife assembly, the first body is disposed in the second body, the rubber roller assembly is close to the thermal print head, and the characteristic is that the A swing bar is rotatably provided on one side of the second frame, and the top end of the swing bar can offset the movable knife assembly and drive the movable knife assembly to translate back into position;

The detachment mechanism includes

The rotating shaft is arranged on the second frame parallel to the length direction of the thermal print head; both ends are respectively provided with a first ornament and a second ornament that can drive the rubber roller assembly to separate from the second body. One side of the aforementioned first ornament The molding has a first force-bearing part;

The wrench is rotatably mounted on the second frame. A first force-applying part that cooperates with the first force-receiving part and a second force-applying part that cooperates with the bottom end of the swing rod are formed on the inner side. The outer end extends outward. out to form a handle; and

The first reset member is located on the aforementioned second frame and always forces the rotating shaft to maintain the initial state;

Press the handle of the wrench, the first force-applying part acts on the first force-receiving part, the first swinging part rotates, thereby rotating the rotating shaft, and then the second swinging part rotates, and the first swinging part and the second swinging part drive both ends of the rubber roller assembly at the same time , forcing the rubber roller assembly to detach from the groove, and the first frame to detach from the second frame. At the same time, the second force-applying part of the wrench acts on the bottom end of the swing rod. After the swing rod rotates, the top end of the swing rod drives the movable knife assembly to translate. return.

The wrench has a third force-applying part, and the second frame is provided with a first transmission gear set, a first motor and a wheel frame. The aforementioned first transmission gear set at least includes a driving gear, an intermediate gear and an output gear. , the aforementioned driving gear is drivingly connected to the first motor, the aforementioned intermediate gear is a double gear and its two ends mesh with the driving gear and the output gear respectively, the aforementioned intermediate gear is rotatably installed on the support shaft of the wheel frame, and the wheel The frame can rotate around a fulcrum and has a second force-bearing part. When the handle of the wrench is in a pressed state, the third force-applying part of the wrench can drive the second force-bearing part of the wheel frame, thereby causing the wheel frame to rotate, so that the middle The gear moves away from the driving gear and disengages. Cutting off the power transmission of the movable knife ensures the smooth return of the movable knife and ensures the safety of the operator.

Further, the second force-receiving part and the support shaft are respectively located on both sides of the fulcrum of the wheel frame, and the line connecting the force-receiving point of the second force-receiving part and the fulcrum and the line connecting the central axis of the support shaft and the fulcrum are The connecting line forms an acute angle.

Furthermore, the second frame is provided with a second reset member that always forces the wheel frame to maintain the initial position.

Furthermore, the rear end of the auxiliary gear has a cavity, and a third reset member is provided in the cavity. The third reset member acts on the auxiliary gear and always forces the auxiliary gear to drive the rack portion to move away from the fixed knife.

Furthermore, a strip-shaped hole is formed on the side of the carrier plate close to the rack portion, and the bottom end of the swing rod extends into the strip-shaped hole.

Furthermore, a limiting block capable of limiting the swing range of the fork bar is provided on one side of the second frame close to the fork bar.

In order to make the movable knife assembly move smoothly, the movable knife assembly includes a carrier plate and a movable blade arranged on the carrier plate. Both ends of the carrier plate have rack parts, and the second frame is provided with a connecting shaft. , the output gear is provided at one end of the connecting shaft, and the other end of the connecting shaft is provided with an auxiliary gear that meshes with the rack portion for transmission. The auxiliary gear can drive the rack portion synchronously with the output gear.

Compared with the prior art, the advantage of the present invention is that when paper is jammed, pressing the wrench can first separate the first body and the second body, and at the same time, the swing rod acts on the movable knife assembly, causing the movable knife assembly to move quickly at the same time. By moving back, the movable knife assembly and the fixed knife are instantly separated, completely eliminating the paper jam and preventing the movable knife assembly from being unable to return and causing functional failure.

Description of the drawings

Figure 1 is a schematic structural diagram of the embodiment.

Figure 2 is an exploded view of Figure 1.

Figure 3 is a schematic structural diagram of the second body in Figure 2 from another perspective.

Figure 4 is a schematic structural diagram of the second body in Figure 2 after taking out the gear cover.

Figure 5 is a partially exploded enlarged view of Figure 4.

Figure 6 is an enlarged view of the combination of the wheel frame and the second reset member in Figure 5.

Figure 7 is an enlarged view of the back of the gear cover.

Figure 8 is a perspective view of the wrench in Figure 5 from another perspective.

Figure 9 is a partial structural diagram of the second body.

Figure 10 is a partially exploded view of Figure 9.

Detailed ways

The present invention will be described in further detail below with reference to the embodiments of the drawings.

As shown in Figures 1 to 4, the thermal printer core in this embodiment includes a first body 1a and a second body 1b. The first body 1a is detachably mounted on the second body 1b through a detachment mechanism. 1a includes a first frame 11a, a rubber roller assembly 12a and a fixed knife 13a. The rubber roller is rotatably installed on the first frame 11a. The fixed knife 13a is installed on the first frame 11a; the first body 1a is installed on the first frame 11a. In the state of the second machine body 1b, the rubber roller assembly 12a is close to the thermal print head 15b.

9 and 10, the second body 1b includes a second frame 11b and a thermal print head 15b located on the second frame 11b, a movable knife assembly 14b, a first transmission gear set 5, and a second transmission gear set. 5a, the first motor 6, the second motor 6a, the wheel frame 3 and the detachment mechanism. Both sides of the front end of the second frame 11b have grooves 16b for the rubber roller assembly 12a; the second motor 6a passes through the second transmission gear set 5a The rubber roller assembly 12a is driven to rotate, and the power output end of the second transmission gear set 5a meshes with the rubber roller gear 121 for transmission.

The movable knife assembly 14b is movably arranged on the second frame and has rack portions 144 at both ends. The movable knife assembly 14b cooperates with the fixed knife 13a to complete paper cutting; the first transmission gear set 5 is arranged on the second frame. On one side, the output gear 51 of the first transmission gear set 5 meshes with the rack portion 144 on one side of the movable knife assembly 14b.

A swing rod 2 is rotatably provided on one side of the second frame 11b. The top end of the swing rod 2 can resist the movable knife assembly 14b and drive the movable knife assembly 14b to translate back. One side of the second frame 11b also has a limiting block 16b that limits the rotation range of the swing bar, as shown in Figure 4.

As shown in Figure 5, Figure 9 and Figure 10, the detachment mechanism includes a rotating shaft 41a, a wrench 1 and a first reset part 1c. The rotating shaft 41a is arranged on the second frame parallel to the length direction of the thermal print head 15b; There are a first rocker 4 and a second rocker 4a that can drive the rubber roller assembly 12a to separate from the second body 1b. A first force-receiving part 41 is formed on one side of the first rocker 4.

The wrench 1 is rotatably mounted on the second frame 11b. The first force applying part 11, the second force applying part 12 and the third force applying part 13 are formed on the inner side, and the outer end extends outward to form a handle 14; As shown in Figures 2 and 7, a gear cover 13b is provided on the outside of the first transmission gear set, and a convex shaft 131 is provided on the inside of the gear cover 13b. The convex shaft 131 cooperates with the shaft hole of the wrench 1 to realize the rotation of the wrench 1.

The first return member 1c is provided on the second frame 11b and always forces the rotating shaft 41a to maintain the initial state; the first return member 1c in this embodiment uses a torsion spring and is sleeved on the shaft portion 112.

The first transmission gear set includes a driving gear 53, an intermediate gear 52 and an output gear 51. The driving gear 53 is drivingly connected to the first motor 6. The intermediate gear 52 is a double gear and meshes with the driving gear 53 and the output gear 51 at both ends respectively. The intermediate gear 52 is rotatably provided on the support shaft 31 of the wheel carrier 3. The wheel carrier 3 can rotate around a fulcrum and has a second force-receiving portion 32. In this embodiment, the output gear 51 and the swing rod 2 are both located on the shaft 111 .

As shown in FIG. 4 , in this embodiment, the second force-bearing part 32 and the support shaft 31 are respectively located on both sides of the fulcrum of the wheel frame 3 , and the line connecting the force-bearing point of the second force-bearing part 32 and the fulcrum is The connection line between the central axis of the support shaft 31 and the fulcrum forms an acute angle. With reference to Figure 6, the second frame 11b is provided with a second return member 2c that always forces the wheel frame 3 to maintain the initial position. Specifically, the second return member 2c uses a torsion spring, and the wheel frame 3 has a spring near the second force-receiving part 32. The resisting portion 33 and one end of the second reset member 2c are always in contact with the resisting portion 33 . The second return member 2c can quickly return the driving wheel frame 3 when the external force is removed by the wrench, thereby quickly returning the movable knife assembly.

4 and 10, the movable knife assembly 14b includes a carrier plate 142 and a movable blade 141 provided on the carrier plate 142. Both ends of the carrier plate 142 have rack portions 144, and the second frame 11b is provided with a connecting Shaft 512, the output gear 51 is provided at one end of the connecting shaft 512, and the other end of the connecting shaft 512 is provided with an auxiliary gear 511 that meshes with the rack portion 144 for transmission. The auxiliary gear 511 can drive the rack portion 144 synchronously with the output gear 51. . In this embodiment, one side of the carrier plate 142 has a strip hole 143 for the top end of the swing rod 2 to extend into.

The rear end of the auxiliary gear 511 has a cavity, and a third reset member 3c is provided in the cavity. The third reset member acts on the auxiliary gear 511 and always forces the auxiliary gear 511 to drive the rack portion 144 to move away from the fixed knife. The third restoring member in this embodiment may be a torsion spring or a coil spring.

When paper is jammed, the handle 14 of the wrench 1 is pressed, the first force applying part 11 acts on the first force receiving part 41, the first swing member 4 rotates, thereby rotating the rotating shaft 41a, and then the second swing member 4a rotates, and the first swing member 4 The two ends of the rubber roller assembly 12a are driven synchronously with the second swing member 4a, forcing the rubber roller assembly 12a to separate from the groove 16b, and the first frame 11a to separate from the second frame 11b; at the same time, the third force applying part 13 of the wrench 1 can drive The second force-receiving part 32 of the wheel carrier 3 further causes the wheel carrier 3 to rotate, thereby causing the intermediate gear 52 to move away from the driving gear 53 and disengage; at the same time, the second force-applying part 12 of the wrench 1 acts on the bottom of the swing rod 2 end, after the swing rod 2 rotates, the top of the swing rod 2 drives the movable knife assembly 14b to translate back to its position. During the early movement of the carrier plate 142, the driving force is provided by the swing rod 2 and the third reset member 3c, and the carrier plate 142 subsequently moves. During the process, the driving force is only provided by the third reset member 3c. The rotation range of the swing rod 2 is small. When the paper is jammed, the swing rod 2 provides assistance. The carrier plate 142 moves back and the paper jam is released. During the subsequent movement of the carrier plate 142, the assistance of the third reset member 3c is enough to cope with it. There is no need for the help of swing bar 2.

Claims (8)

1. The thermal printer core comprises a first machine body (1 a) and a second machine body (1 b), wherein the first machine body (1 a) is detachably arranged on the second machine body (1 b) through a detaching mechanism, the first machine body (1 a) comprises a first frame (11 a), a rubber roller assembly (12 a) and a fixed knife (13 a), the rubber roller is rotatably arranged on the first frame (11 a), and the fixed knife (13 a) is arranged on the first frame (11 a);

the second machine body (1 b) comprises a second machine frame (11 b), a thermal printing head (15 b), a movable cutter assembly (14 b), a first transmission gear set (5) and a detaching mechanism, wherein the thermal printing head is arranged on the second machine frame (11 b), and grooves (16 b) for arranging rubber roll assemblies (12 a) are formed in two sides of the front end of the second machine frame (11 b);

the movable cutter assembly (14 b) is movably arranged on the second frame, at least one end of the movable cutter assembly is provided with a rack part (144), and the movable cutter assembly (14 b) is matched with the fixed cutter (13 a) to cut paper; the first transmission gear set (5) is arranged on one side of the second frame, an output gear (51) of the first transmission gear set (5) is meshed with a rack part (144) on one side of the movable cutter assembly (14 b), and the rubber roller assembly (12 a) is close to the thermal printing head (15 b) in a state that the first machine body (1 a) is arranged on the second machine body (1 b);

the device is characterized in that one side of the second frame (11 b) is rotatably provided with a swinging rod (2), and the top end of the swinging rod (2) can prop against the movable cutter assembly (14 b) and can drive the movable cutter assembly (14 b) to translate and return;

the detaching mechanism comprises

A rotating shaft (41 a) provided on the second frame in parallel with the longitudinal direction of the thermal head (15 b); the two ends of the first swing piece (4) and the second swing piece (4 a) which can drive the rubber roller assembly (12 a) to separate from the second machine body (1 b) are respectively arranged, and a first stress part (41) is formed on one side of the first swing piece (4);

a wrench (1) rotatably arranged on the second frame (11 b), a first force application part (11) matched with the first force receiving part (41) and a second force application part (12) matched with the bottom end of the swing rod (2) are formed on the inner side, and the outer end of the wrench extends outwards to form a handle part (14); and

a first reset piece (1 c) arranged on the second frame (11 b) and always forcing the rotating shaft (41 a) to keep an initial state;

the handle (14) of the wrench (1) is pressed, the first force application part (11) acts on the first force receiving part (41), the first swinging part (4) rotates, so that the rotating shaft (41 a) rotates, the second swinging part (4 a) rotates, the first swinging part (4) and the second swinging part (4 a) simultaneously drive two ends of the rubber roller assembly (12 a), the rubber roller assembly (12 a) is forced to be separated from the groove (16 b), the first rack (11 a) is separated from the second rack (11 b), meanwhile, the second force application part (12) of the wrench (1) acts on the bottom end of the swinging rod (2), and after the swinging rod (2) rotates, the top end of the swinging rod (2) drives the movable cutter assembly (14 b) to translate and return.

2. A thermal printer according to claim 1, wherein the wrench (1) has a third force application portion (13), the second frame (11 b) is provided with a first transmission gear set (5), a first motor (6) and a wheel frame (3), the first transmission gear set at least includes a driving gear (53), an intermediate gear (52) and an output gear (51), the driving gear (53) is in driving connection with the first motor (6), the intermediate gear (52) is a duplex gear and two ends of the intermediate gear are respectively engaged with the driving gear (53) and the output gear (51), the intermediate gear (52) is rotatably provided on a supporting shaft (31) of the wheel frame (3), the wheel frame (3) can rotate around a pivot and has a second force application portion (32), and the handle portion (14) of the wrench (1) is in a pressed state, the third force application portion (13) of the wrench (1) can drive the second force application portion (32) of the wheel frame (3), and further rotate the wheel frame (3), so that the intermediate gear (52) is disengaged from the driving gear (53).

3. The thermal printer core according to claim 2, wherein the second stress portion (32) and the supporting shaft (31) are respectively located at two sides of the pivot of the wheel frame (3), and a connection line between the stress point of the second stress portion (32) and the pivot and a connection line between the central axis of the supporting shaft (31) and the pivot form an acute angle.

4. A thermal printer cartridge according to claim 2, characterized in that said second frame (11 b) is provided with a second return element (2 c) which always forces the carriage (3) to remain in the initial position.

5. The thermal printer core according to claim 1, wherein the moving blade assembly (14 b) comprises a carrier plate (142) and a moving blade (141) disposed on the carrier plate (142), both ends of the carrier plate (142) are provided with rack portions (144), the second frame (11 b) is provided with a connecting shaft (512), the output gear (51) is disposed at one end of the connecting shaft (512), an auxiliary gear (511) engaged with the rack portions (144) is disposed at the other end of the connecting shaft (512), and the auxiliary gear (511) can synchronously drive the rack portions (144) with the output gear (51).

6. A thermal printer according to claim 5, wherein the rear end of the auxiliary gear has a cavity in which is located a third return member which acts on the auxiliary gear and always forces the auxiliary gear to move the rack portion away from the stationary blade.

7. The thermal printer core of claim 5, wherein a bar hole is formed on one side of the carrier plate near the rack portion, and the bottom end of the swing rod extends into the bar hole.

8. The thermal printer core of claim 7, wherein a stopper capable of limiting the swing amplitude of the swing lever is arranged on one side of the second frame close to the swing lever.