CN212920839U - Spacing subassembly and printer - Google Patents

Abstract

The utility model relates to the technical field of printers, in particular to a limiting assembly and a printer, wherein the limiting assembly comprises a shell, a rotating shaft, a cam, a fixed part and an elastic part, and the rotating shaft can be rotatably arranged on the shell; the cam is fixedly arranged on the rotating shaft, when the cam rotates to a preset position along a first direction along with the rotating shaft, a first contact part of the cam is used for being abutted against the printing mechanism so as to limit the printing mechanism to be positioned at a position to be printed, and the printing mechanism and the printing roller are separated by a first distance value at the moment; the fixed part is arranged on the rotating shaft; at least when the pivot is located preset position, the elastic component can give the certain axial pretightning force of pivot to make the pivot drive fixed part support tightly in the casing, friction increase between the two, the pivot is difficult to become flexible, thereby the cam can stop steadily in setting for the position, can accurately stop in waiting to print the position in order to guarantee to print the mechanism, and then can guarantee that the position when printing the mechanism and being close to the print roll and printing is stable, guarantees to print the effect.

Description

Spacing subassembly and printer

Technical Field

The utility model relates to a printer technical field especially relates to a spacing subassembly and printer.

Background

The thermal transfer printer comprises a printing mechanism and a printing roller, wherein a carbon ribbon and a recording medium are pressed on the printing roller through a printing head of the printing mechanism, the printing head is heated and controlled, ink on the carbon ribbon is transferred to the recording medium, and date, bar code and the like are printed. When the area of the recording medium where the content is not to be printed passes through the print head, the print head needs to be lifted to a waiting printing position to save the carbon tape. When the carbon ribbon is installed, the printing head needs to be lifted to a higher initial position so as to facilitate the entry of the carbon ribbon. Conversely, after the power-on self-test, the printing head needs to be pressed down to a waiting printing position from an initial position, when the content is printed, the printing head is pressed down to the printing position again, in the whole printing process, the printing head needs to be frequently switched between the printing position and the waiting printing position, in the prior art, the printing mechanism where the printing head is located is usually driven to be switched between the initial position and the waiting printing position through a cam mechanism, the cam mechanism comprises a rotating shaft and a cam fixedly arranged on the rotating shaft, since the cam is frequently struck by the printing mechanism, the cam transmits force to the shaft, particularly when the printer vibrates, the stress point between the printing mechanism and the cam is unstable, which easily causes unstable stress of the rotating shaft and easy loosening of the rotating shaft, further, the position of the cam is easily changed, and the printing head cannot be accurately stopped at the waiting printing position, which affects the printing precision.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the utility model provides a spacing subassembly and printer to cam leads to the pivot to become flexible because of the atress is unstable easily among the spacing subassembly among the solution correlation technique, and then can't guarantee to beat printer head and accurately stop at waiting to print the position, influences the problem of printing the precision.

In one aspect, the utility model provides a spacing subassembly, this spacing subassembly includes:

a housing;

the rotating shaft is rotatably arranged on the shell;

the cam is fixedly arranged on the rotating shaft, a first contact part is arranged on the periphery of the cam, when the cam rotates to a preset position along a first direction along with the rotating shaft, the first contact part is used for being abutted against the printing mechanism so as to limit the printing mechanism to be positioned at a position to be printed, and when the printing mechanism is positioned at the position to be printed, the printing mechanism and the printing roller are separated by a first distance value;

a fixing member provided to the rotating shaft;

and the elastic piece has a trend of driving the rotating shaft to move along the axial direction of the rotating shaft at least when the rotating shaft is positioned at the preset position, so that the fixing part is abutted against the shell.

As a preferable technical solution of the limiting assembly, the distances from the respective positions on the first contact portion to the axis of the rotating shaft are equal along the rotating direction of the cam and along the axial direction of the rotating shaft.

As a preferred technical solution of the limiting assembly, the rotating shaft can rotate relative to the housing and has a first position and a second position;

when the rotating shaft is located at the first position, the first contact part is separated from the printing mechanism, and the printing mechanism is a second distance value away from the printing roller, wherein the second distance value is larger than the first distance value; the first contact part can be abutted to the printing mechanism, the rotating shaft is located at the preset position, and at least when the rotating shaft is located at the second position, the elastic piece is in a compressed state.

As the preferred technical scheme of the limiting assembly, the limiting assembly comprises a handle fixedly arranged at one end of the rotating shaft, and when the rotating shaft is located at the second position, the handle can be abutted against the shell to prevent the handle from continuously driving the rotating shaft to rotate along the first direction.

As a preferred technical scheme of the limiting assembly, one of the shell and the handle is provided with a limiting groove, the other is convexly provided with an inserting column, the limiting groove is arc-shaped, the central line of the limiting groove is superposed with the central line of the rotating shaft, the limiting groove is provided with a first limiting surface and a second limiting surface which are positioned at two ends of the limiting groove in the extending direction, and the inserting column can be inserted into the limiting groove in a sliding manner;

when the rotating shaft is located at the first position, the inserting column is abutted to the first limiting surface, and when the rotating shaft is located at the second position, the inserting column is abutted to the second limiting surface.

As a preferable technical solution of the limiting assembly, the housing is provided with a stop block, and when the cam rotates to the preset position along the first direction along with the rotating shaft, the stop block abuts against the fixing member to prevent the rotating shaft from continuing to rotate along the first direction.

As the preferred technical scheme of spacing subassembly, the casing is equipped with the card protruding, fixed part can follow the pivot is followed first direction rotates and crosses the card protruding, and works as when the cam is located when predetermineeing the position, fixed part can with the card protruding is followed the second direction butt, the second direction with the direction of first direction is opposite.

As a preferable technical solution of the limiting assembly, a guide slope is provided on an outer end surface of the housing, the guide slope extends along a circumferential direction of the rotating shaft, a height of the guide slope is gradually increased along the first direction, the fixing member can abut against the guide slope, and the elastic member is switched from a natural extension state to a compression state in a process of switching the rotating shaft from the first position to the second position.

As a preferable technical solution of the limiting assembly, the number of the guide slopes is two, the two guide slopes are arranged in central symmetry with respect to the axis of the rotating shaft, and the fixing member abuts against the two guide slopes at the same time.

On the other hand, the utility model also provides a printer, including printing roller unit, printing mechanism, actuating mechanism, the spacing subassembly in any above-mentioned scheme, printing roller unit is including supporting in the casing and being used for supporting the printing roller of the record medium of feeding, printing mechanism supports in the casing, printing mechanism set up in printing roller unit with spacing subassembly between;

the printing mechanism can be driven by the driving mechanism to approach the printing roller to record the printing content on the recording medium, or to be away from the printing roller and abut against the cam to limit the distance from the printing mechanism to the printing roller.

The utility model has the advantages that:

the utility model provides a limiting assembly and a printer, wherein the limiting assembly comprises a shell, a rotating shaft, a cam, a fixed part and an elastic part, and the rotating shaft can be rotatably arranged on the shell; the cam is fixedly arranged on the rotating shaft, a first contact part is arranged on the periphery of the cam, when the cam rotates to a preset position along a first direction along with the rotating shaft, the first contact part is used for being abutted against the printing mechanism so as to limit the printing mechanism to be positioned at a position to be printed, and when the printing mechanism is positioned at the position to be printed, the printing mechanism and the printing roller are separated by a first distance value; the fixed part is arranged on the rotating shaft; at least when the pivot is located preset position, the elastic component has the trend of drive pivot along the axial direction motion of pivot, the elastic component can give the certain axial pretightning force of pivot this moment, so that the pivot drives the fixed part and supports tightly in the casing, thereby great frictional resistance has between fixed part and the casing, the pivot is difficult to become flexible, can guarantee that the cam stops in the settlement position steadily, in order to guarantee that printing mechanism can accurately stop in waiting to print the position and not receive the influence of factors such as printing mechanism self vibration, and then can guarantee that driving piece drive printing mechanism is stable when being close to the print roller, guarantee to print the effect.

Drawings

Fig. 1 is a first schematic structural diagram of a limiting assembly in an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of the limiting assembly in the embodiment of the present invention;

fig. 3 is a first schematic structural diagram of the limiting assembly and the printing mechanism (the printing mechanism is located at the printing position) according to the embodiment of the present invention;

fig. 4 is a second schematic structural view of the limiting assembly and the printing mechanism in the embodiment of the present invention; (the printing mechanism is located at the standby position);

fig. 5 is a third schematic structural view of the limiting assembly and the printing mechanism in the embodiment of the present invention; (the printing mechanism is in the home position);

fig. 6 is a cross-sectional view of a printer according to an embodiment of the present invention;

fig. 7 is a first schematic structural diagram of a printer according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a printer according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a printer according to an embodiment of the present invention;

fig. 10 is a cross-sectional view of a printing mechanism in an embodiment of the invention;

fig. 11 is a schematic structural view of a printing mechanism according to an embodiment of the present invention.

In the figure:

1. a housing; 11. a first housing; 111. a limiting groove; 1111. a first limiting surface; 1112. a second limiting surface; 12. a second housing;

2. a limiting component; 21. a cam; 22. a rotating shaft; 23. a handle; 231. inserting a column; 24. a fixing member; 25. an elastic member;

3. a printing mechanism; 30. a print head; 31. a transfer rack; 32. a support; 33. a connecting member; 331. a connecting rod; 332. a roller; 34. a slide rail; 35. a slider; 36. a drive member; 361. a body; 362. an output rod; 37. an elastic element; 38. a connecting shaft; 39. a connecting pin;

41. a first bushing; 42. a second shaft sleeve; 421. a shaft hole; 422. avoiding holes; 423. a guide ramp; 424. clamping convex; 425. a stop block;

5. a print roller;

6. a detection member;

71. a releasing roller; 72. a wind-up roll; 73. a support roller;

100. a carbon ribbon; 200. a recording medium.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 to 11, the present embodiment provides a printer, which includes a printing roller unit, a printing mechanism 3, a driving mechanism, and a limiting component 2, wherein the printing roller unit includes a printing roller 5 supported by a housing 1 and used for supporting a fed recording medium 200, the printing mechanism 3 is supported by the housing 1, and the printing mechanism 3 is disposed between the printing roller unit and the limiting component 2. The printing mechanism 3 can be driven by the driving mechanism to approach the printing roller 5 to record the printing content on the recording medium 200, or to be far away from the printing roller 5 and abut against the limiting component 2 to limit the distance of the printing mechanism 3 from the printing roller 5. In the embodiment, the printing mechanism 3 has a print head 30, and the driving mechanism drives the printing mechanism 3 to move close to or away from the print roller 5, so that the print head 30 and the print roller 5 are tangentially matched, as shown in fig. 3, when the print head 30 and the print roller 5 are tangentially matched, and the printing mechanism 3 is located at a printing position, the print head 30 can record the print content on the recording medium 200; as shown in fig. 4, when the printing mechanism 3 and the printing roller 5 are separated and abut against the limiting component 2, the printing mechanism 3 is located at the position to be printed, and the printing head 30 of the printing mechanism 3 is at a first distance value from the printing roller 5.

The printer that this embodiment provided, under the restriction of spacing subassembly 2, printing mechanism 3 can accurately stop in waiting to print the position, can not appear leading to printing mechanism 3 skew to wait the condition of printing the position because of the influence of factors such as the vibration of printer self, to guarantee printing mechanism 3 beat printer head 30 apart from print roller 5 first distance value, and then can guarantee that actuating mechanism drive printing mechanism 3 is by waiting to print when the position removes to printing the position, printing mechanism 3's printing position can keep the position stable, in order to guarantee to print the quality. In the present embodiment, the printer is preferably a thermal transfer printer, the print head 30 can transfer the ink on the carbon ribbon 100 to the recording medium 200, the recording medium 200 is, for example, bills, deposit slips, receipt paper, label paper, living paper, various soft packages such as food, medicine, daily chemical, and the like, and the recording medium 200 and the carbon ribbon 100 pass through between the print roller 5 and the print head 30.

In this embodiment, the driving mechanism has a driving member 36 and an elastic element 37 both connected between the housing 1 and the printing mechanism 3, the printing mechanism 3 is disposed between the printing roller unit and the limiting component 2, the printing mechanism 3 can approach the printing roller 5 under the driving of the driving member 36 to record the printing content on the recording medium 200 through the printing head 30, and the printing mechanism 3 can be away from the printing roller 5 and abut against the limiting component under the driving of the elastic element 37 to define a first distance value of the printing mechanism 3 from the printing roller 5.

Referring to fig. 1, 2, and 6 to 8, the position-limiting assembly 2 includes a rotating shaft 22, a cam 21, a fixing member 24, an elastic member 25, and the housing 1. The rotating shaft 22 is rotatably arranged on the shell 1; the cam 21 is fixedly arranged on the rotating shaft 22, a first contact part is arranged on the periphery of the cam 21, when the cam 21 rotates to a preset position along a first direction along with the rotating shaft 22, the first contact part is used for being abutted against the printing mechanism 3 so as to limit that the printing mechanism 3 is located at a position to be printed, and when the printing mechanism 3 is located at the position to be printed, the printing mechanism 3 is separated from the printing roller 5 by a first distance value; the fixing member 24 is provided on the rotating shaft 22; at least when the rotating shaft 22 is located at the preset position, the elastic member 25 has a tendency to drive the rotating shaft 22 to move along the axial direction of the rotating shaft 22, so that the fixing part 24 abuts against the housing 1. When the rotating shaft 22 drives the cam 21 to rotate to the set position, the cam 21 abuts against the printing mechanism 3 to limit the position to be printed of the printing mechanism 3. Moreover, the elastic member 25 can provide a driving force for the rotating shaft 22 at this time, so that the rotating shaft 22 drives the fixing member 24 to abut against the housing 1, a large frictional resistance exists between the fixing member 24 and the housing 1, and if the rotating shaft 22 rotates, the frictional resistance needs to be overcome to ensure that the position of the rotating shaft 22 is not easy to loosen, so that the cam 21 can be ensured to be stably stopped at the set position, and the printing mechanism 3 can be ensured to be accurately stopped at the position to be printed. Wherein the first direction is shown as ab direction in fig. 6. Of course, in other embodiments, the limiting assembly 2 can also be configured as an electric push rod, an air cylinder, a lead screw nut, and the like. Preferably, the fixing member 24 is a pin detachably connected to the rotation shaft 22, but the fixing member 24 may be provided as a protrusion structure integrated with the rotation shaft 22.

Alternatively, the respective positions on the first contact portion are equidistant from the axis of the rotating shaft 22 in the rotating direction of the cam 21 and in the axial direction of the rotating shaft 22. With the arrangement, no matter the printing mechanism 3 moves along the radial direction of the cam 21 relative to the cam 21 or moves along the rotating shaft 22 relative to the cam 21, the force given to the cam 21 by the printing mechanism 3 can be ensured to finally point to the center of the rotating shaft 22, the cam 21 can not give the rotating tangential force to the rotating shaft 22, the rotating shaft 22 is stressed stably and is not easy to rotate, and the cam 21 can be ensured to have a stable stopping effect on the printing mechanism 3.

Optionally, referring to fig. 2, the limiting assembly 2 further includes a handle 23 fixedly disposed at one end of the rotating shaft 22. The operator can rotate the handle 23 to drive the rotating shaft 22 to rotate, so that the position of the cam 21 can be conveniently adjusted in the assembling process. Of course, in other embodiments, the rotation shaft 22 may be driven to rotate by a servo motor, but the cost is increased by providing the servo motor.

Optionally, the elastic piece 25 is a pressure spring, two ends of the pressure spring are respectively abutted to the shell 1 and the handle 23, at least when the rotating shaft 22 is located at a preset position, the pressure spring is in a compression state, certain axial pretightening force is given to the rotating shaft 22 by the pressure spring at the moment, the friction force required to be overcome by the rotation of the rotating shaft 22 can be increased, the rotating shaft 22 is not easy to loosen, and then the cam 21 can be ensured to be stably located at a set position so as to accurately limit the position to be printed of the printing mechanism 3. Meanwhile, the force applied by the printing mechanism 3 that can be received by the cam 21 can be increased without loosening the rotating shaft 22. In other embodiments, the compression spring may also directly abut against the rotating shaft 22 and the fixing part 24 to press the fixing part 24 against the housing 1. The elastic member 25 may be replaced by a rubber sleeve, a tension spring, or the like.

Alternatively, the rotating shaft 22 can rotate relative to the housing 1 to have a first position and a second position, and the outer periphery of the cam 21 further has a second contact portion, and the second contact portion is in smooth transition with the first contact portion; when the rotating shaft 22 is located at the first position, the second contact portion can abut against the printing mechanism 3 to limit the printing mechanism 3 to be located at the initial position, referring to fig. 5, when the printing mechanism 3 is located at the initial position, the printing mechanism 3 and the printing roller 5 are separated by a second distance value, and the second distance value is greater than the first distance value, which is convenient for maintaining the printing module, such as replacing a carbon tape roll. It should be noted that, when the printing mechanism 3 is located at the initial position, the first contact portion and the second contact portion may also be separated from the printing mechanism 3, so that the printing module is more convenient to maintain. As can be seen from fig. 3 to 5, when the printing mechanism 3 is located at the printing position, the position to be printed, and the initial position, the distance between the printing head 30 and the printing roller 5 is sequentially increased, in this embodiment, the rotating shaft 22 drives the cam 21 to rotate, so that the printing mechanism 3 can be moved from the initial position to the position to be printed, thereby realizing the first-level pressing of the printing mechanism 3, the driving member 36 drives the printing mechanism 3 to be moved from the position to be printed to the printing position, thereby realizing the second-level pressing of the printing mechanism 3, the elastic element 37 can drive the printing mechanism 3 to be moved from the printing position to the position to be printed, and can be moved from the position to be printed to the initial position.

Alternatively, when the rotating shaft 22 is located at the second position, the rotating shaft 22 is located at the preset position, and the handle 23 abuts against the housing 1 to limit the rotating shaft 22 to rotate along the first direction. This prevents the operator from rotating the handle 23 by too large an angle during assembly or adjustment, which would result in the cam 21 not stopping accurately at the predetermined position. Specifically, in this embodiment, the housing 1 is provided with a limiting groove 111, the handle 23 is convexly provided with an inserting column 231, the limiting groove 111 is arc-shaped, a central line of the limiting groove 111 coincides with a central line of the rotating shaft 22, the limiting groove 111 is provided with a first limiting surface 1111 and a second limiting surface 1112 located at two ends of the extending direction of the limiting groove, and the inserting column 231 can be slidably inserted into the limiting groove 111; when the shaft 22 is located at the first position, the plug 231 abuts against the first limiting surface 1111, and when the shaft 22 is located at the second position, the plug 231 abuts against the second limiting surface 1112. In other embodiments, the housing 1 may be provided with the insertion post 231, the handle 23 may be provided with the limiting groove 111, the insertion post 231 may be further protruded on the housing 1, the handle 23 does not need to be provided with the limiting groove 111, and when the handle 23 drives the rotating shaft 22 to rotate to the second position, the side wall of the handle 23 abuts against the insertion post 231.

The casing 1 comprises a first casing 11 and a second casing 12, the first casing 11 can be separated or buckled relative to the second casing 12, when the first casing 11 is buckled with the second casing 12, the first casing 11 and the second casing 12 are enclosed to form an accommodating cavity, and the printing roller unit and the head unit are both accommodated in the accommodating cavity so as to ensure the safety of printing operation. By making the first housing 11 separable with respect to the second housing 12, maintenance of the printing roller unit and the head unit is facilitated. In this embodiment, the rotating shaft 22 is rotatably supported by the first housing 111 and the second housing 121. Preferably, in this embodiment, the housing 1 further includes a first shaft sleeve 41 disposed on the first housing 111 and a second shaft sleeve 42 disposed on the second housing 112, and the rotating shaft 22 sequentially passes through the first shaft sleeve 41 and the second shaft sleeve 42, so as to further ensure smooth rotation of the rotating shaft 22. The first housing 111 and the first sleeve 41, and the second housing 112 and the second sleeve 42 can be separately disposed, and of course, the first housing 111 and the first sleeve 41, and the second housing 112 and the second sleeve 42 can also be integrally disposed. Both ends of the elastic member 25 abut against the first housing 11 and the handle 23, respectively. Two ends of the elastic element 25 are respectively abutted against the first housing 11 and the handle 23, when the cam 21 is located at the preset position, the fixing element 24 is abutted against the second sleeve 42 on the second housing 12 under the driving of the elastic force of the elastic element 25 to increase the frictional resistance when the rotating shaft 22 rotates, thereby ensuring the position stability of the rotating shaft 22 and enabling the cam 21 to be stably located at the preset position.

Alternatively, the outer end surface of the second collar 42 of the housing 1 is provided with a catching protrusion 424, the fixing member 24 can pass over the catching protrusion 424 as the rotating shaft 22 rotates in the first direction, and when the cam 21 is located at the preset position, the fixing member 24 can abut against the catching protrusion 424 in the second direction, which is opposite to the first direction. By providing the locking protrusion 424, when the shaft 22 rotates to the second position, if the shaft 22 is separated from the second position along the second direction, the fixing member 24 needs to pass over the locking protrusion 424, so that the rotation of the shaft 22 needs to overcome a larger friction force, and further the shaft 22 can be prevented from loosening.

In this embodiment, the second sleeve 42 is provided with a shaft hole 421 corresponding to the rotating shaft 22 and an avoiding hole 422 communicated with the shaft hole 421, when the first housing 11 and the second housing 12 are assembled, the end of the rotating shaft 22 passes through the second sleeve 42 from the shaft hole 421, meanwhile, the fixing part 24 passes through the second sleeve 42 from the avoiding hole 422 along with the rotating shaft 22, at this time, the rotating shaft 22 is located at the first position, when the handle 23 is rotated along the first direction, the rotating shaft 22 rotates, and correspondingly, the fixing part 24 can abut against the second sleeve 42, so as to realize axial limit of the rotating shaft 22. Preferably, when the fixing member 24 passes through the avoiding hole 422 and the rotating shaft 22 is located at the first position, the compression spring is in a naturally extended state, and when the rotating shaft 22 rotates to the second position in the first direction, the compression spring is gradually compressed, so that the first housing 11 and the second housing 12 are conveniently assembled. In another embodiment, when the fixing member 24 passes through the clearance hole 422 and the rotating shaft 22 is located at the first position, the compression spring is in a naturally extended state, and when the rotating shaft 22 rotates to the second position along the first direction, the compression spring is first kept in the naturally extended state and then is gradually compressed. In another embodiment, when the fixing element 24 passes through the position-avoiding hole 422 and the rotating shaft 22 is located at the first position, the compression spring may also be set in a compressed state, and the elastic force of the compression spring needs to be overcome when the first housing 11 and the second housing 12 are assembled.

Alternatively, referring to fig. 1 and 2, the outer end surface of the second sleeve 42 of the housing 1 is provided with a guide slope 423, the guide slope 423 extends along the circumferential direction of the second sleeve 42, the height of the guide slope 423 gradually increases along the first direction, the fixing member 24 can abut against the guide slope 423, and when the rotating shaft 22 is switched from the first position to the second position, the elastic member 25 is switched from the natural extension state to the compression state. Specifically, the catching protrusion 424 is provided to the guide slope 423. With this arrangement, when the rotating shaft 22 is located at the first position, the operator rotates the rotating shaft 22 along the first direction, and the compressed spring can be gradually compressed, so that the pre-tightening force between the fixing member 24 and the guiding slope 423 will be gradually increased, the friction force to be overcome when the rotating shaft 22 rotates will be increased, and the rotating shaft 22 can be prevented from being loosened at the second position to the greatest extent. Moreover, when the operator rotates the handle 23, the operator can feel the change of the friction force, and the mounting hand feeling is good. Preferably, the number of the guide slopes 423 is two, and the two guide slopes 423 are arranged in central symmetry with respect to the axis of the second bushing 42, and the fixing member 24 abuts against the two guide slopes 423 at the same time, so that the fixing member 24 can be ensured to be stressed evenly.

Alternatively, the outer end surface of the second sleeve 42 is provided with a stop block 425, the stop block 425 is spaced from the locking protrusion 424, and when the cam 21 rotates along with the rotating shaft 22 to a preset position along the first direction, the fixing part 24 is located between the stop block 425 and the locking protrusion 424. The stop block 425 prevents the rotation shaft 22 from passing the second position when rotating in the first direction from the first position, which may cause the cam 21 not to be accurately stopped at the position to be printed.

Alternatively, the printer includes a detecting member 6 disposed on the second bushing 42 of the housing 1, the detecting member 6 is used for detecting the position of the fixing member 24, the detecting member 6 is engaged with the fixing member 24 only when the cam 21 rotates along with the rotating shaft 22 to a preset position along the first direction, and the detecting member 6 sends a first detection signal. When the detecting member 6 sends out the first detecting signal, it indicates that the rotating shaft 22 has driven the cam 21 to rotate to the set position, the printing preparation is completed, and the printing can be performed at any time. It will be appreciated that when the shaft 22 is moved away from the second position or the shaft 22 has not been rotated to the second position, the fixing member 24 is separated from the detecting member 6, and the detecting member 6 sends a second detection signal indicating that the cam 21 has not reached the set position. Preferably, the detecting member 6 sends a detection signal to the controller, and when the controller receives the first detection signal, the controller controls the power supply to supply power to the power consuming parts such as the printing head 30; when the controller receives the second detection signal, the controller controls to cut off the electrical connection between the power supply and the print head 30. In this embodiment, the detecting member 6 is a microswitch, and in other embodiments, the detecting member 6 may be replaced by a photoelectric sensor or the like.

Referring to fig. 7, the printer includes a thermal transfer ribbon conveying mechanism disposed in the first housing 11, the thermal transfer ribbon conveying mechanism includes a releasing roller 71, a winding roller 72, and a plurality of supporting rollers 73, the releasing roller 71, the winding roller 72, and the supporting rollers 73 are rotatably connected to the first housing 11, the releasing roller 71 is configured to fix a thermal transfer ribbon roll, and the winding roller 72 is configured to rotate under the driving of a motor to recover the thermal transfer ribbon 100. The roll of each component of the carbon tape conveying mechanism is rotatably provided in the first housing 11, so that the replacement of the carbon tape roll is facilitated.

Alternatively, referring to fig. 10 and 11, the printing mechanism 3 includes an adaptor frame 31 and a holder 32. The switching frame 31 is provided with a connecting piece 33 which can be abutted against the first contact part, and the printing mechanism 3 is arranged on the switching frame 31; the bracket 32 is fixed to the first housing 11 of the housing 1, the driving member 36 includes a body 361 and an output rod 362 capable of extending and contracting relative to the body 361, one of the body 361 and the output rod 362 is fixed to the adaptor bracket 31, and the other is fixed to the bracket 32. Specifically, in the present embodiment, the body 361 of the driving member 36 is fixed to the adaptor bracket 31, and the output rod 362 is fixed to the bracket 32. In other embodiments, the body 361 of the driving member 36 can be fixed to the bracket 32, and the output rod 362 can be fixed to the adaptor bracket 31. The elastic element 37 connects the support 32 and the printing mechanism 3, and may also connect the first housing 11 and the printing mechanism 3, and in this embodiment, the elastic element 37 is preferably a tension spring, and in other embodiments, the tension spring may be replaced by a compression spring, etc. The printer includes a connecting pin 39 provided to the bracket 32 and a connecting shaft 38 provided to the adaptor bracket 31, and both free ends of the tension spring are fixed to the connecting pin 39 and the connecting shaft 38, respectively. The driving member 36 is preferably a pneumatic cylinder, and in other embodiments, the driving member 36 may be an electric push rod or a hydraulic cylinder instead.

Optionally, the adapter frame 31 and the bracket 32 are slidably connected through a sliding assembly, the sliding assembly includes a sliding block 35 disposed on the adapter frame 31, and a sliding rail 34 disposed on the bracket 32, and the sliding block 35 is slidably disposed on the sliding rail 34.

Alternatively, the connecting member 33 has a pressure receiving surface abutting against the cam 21, and the pressure receiving surface is a curved surface or a spherical surface. With this arrangement, the link 33 is in linear abutment with the cam 21 or in point contact therewith, and the frictional force therebetween can be effectively reduced. In this embodiment, the pressure receiving surface is an arc surface, and preferably, the connecting member 33 includes a connecting rod 331 connected to the adapter 31, and a roller 332 rotatably disposed at one end of the connecting rod 331, and an outer peripheral surface of the roller 332 abuts against the cam 21. By providing the roller 332, the connecting member 33 and the cam 21 are in rolling friction, so that the friction force between the two can be further reduced, the wear can be avoided, and the accuracy of the position switching of the print head 30 can be ensured. In other embodiments, the pressure receiving surface may be planar.

Preferably, the cam 21 is made of nylon and glass fiber materials, and the nylon and glass fiber materials have self-lubricating characteristics, so that the friction force between the connecting piece 33 and the cam 21 can be reduced. Preferably, the roller 332 is made of nylon and fiberglass material.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A spacing assembly, comprising:

a housing (1);

a rotating shaft (22) rotatably provided in the housing (1);

the cam (21) is fixedly arranged on the rotating shaft (22), a first contact part is arranged on the periphery of the cam (21), when the cam (21) rotates to a preset position along a first direction along with the rotating shaft (22), the first contact part is used for being abutted against the printing mechanism (3) so as to limit the printing mechanism (3) to be located at a position to be printed, and when the printing mechanism (3) is located at the position to be printed, the printing mechanism (3) is separated from the printing roller (5) by a first distance value;

a fixing member (24) provided to the rotating shaft (22);

the elastic piece (25) has a tendency of driving the rotating shaft (22) to move along the axial direction of the rotating shaft (22) at least when the rotating shaft (22) is located at the preset position, so that the fixing part (24) is abutted against the shell (1).

2. Spacing assembly according to claim 1, characterized in that the respective positions on said first contact portion are equidistant from the axis of said rotating shaft (22) in the direction of rotation of said cam (21) and in the axial direction of said rotating shaft (22).

3. The stop assembly according to claim 1, wherein the shaft (22) is rotatable with respect to the housing (1) to have a first position and a second position;

when the rotating shaft (22) is located at the first position, the first contact part is separated from the printing mechanism (3), and the printing mechanism (3) is separated from the printing roller (5) by a second distance value which is larger than the first distance value; the first contact portion can be abutted against the printing mechanism (3), the rotating shaft (22) is located at the preset position, and at least when the rotating shaft (22) is located at the second position, the elastic piece (25) is in a compressed state.

4. The position limiting assembly according to claim 3, wherein the position limiting assembly comprises a handle (23) fixedly arranged at one end of the rotating shaft (22), and when the rotating shaft (22) is located at the second position, the handle (23) can be abutted against the housing (1) to prevent the handle (23) from further driving the rotating shaft (22) to rotate along the first direction.

5. The limiting assembly according to claim 4, wherein one of the housing (1) and the handle (23) is provided with a limiting groove (111), the other one is provided with a protruding post (231), the limiting groove (111) is arc-shaped, the central line of the limiting groove (111) coincides with the central line of the rotating shaft (22), the limiting groove (111) is provided with a first limiting surface (1111) and a second limiting surface (1112) at two ends in the extending direction of the limiting groove, and the protruding post (231) can be inserted into the limiting groove (111) in a sliding manner;

when the rotating shaft (22) is located at the first position, the inserting column (231) is abutted to the first limiting surface (1111), and when the rotating shaft (22) is located at the second position, the inserting column (231) is abutted to the second limiting surface (1112).

6. The stop assembly according to claim 4, wherein the housing (1) is provided with a stop block (425), and when the cam (21) rotates along the rotating shaft (22) to the preset position along the first direction, the stop block (425) abuts against the fixing part (24) to prevent the rotating shaft (22) from rotating along the first direction.

7. Limit assembly according to claim 4, characterized in that the casing (1) is provided with a jamming (424), that the fixing part (24) can pass the jamming (424) with the rotation of the rotation shaft (22) in the first direction, and that the fixing part (24) can abut the jamming (424) in a second direction, opposite to the first direction, when the cam (21) is in the preset position.

8. The position limiting assembly according to claim 3, characterized in that the outer end surface of the housing (1) is provided with a guide slope (423), the guide slope (423) extends along the circumferential direction of the rotating shaft (22), the height of the guide slope (423) is gradually increased along the first direction, the fixing part (24) can be abutted with the guide slope (423), and the elastic part (25) is switched from a natural extension state to a compression state in the process of switching the rotating shaft (22) from the first position to the second position.

9. The stop assembly according to claim 8, characterized in that the number of the guide ramps (423) is two, and the two guide ramps (423) are arranged centrally symmetrically with respect to the axis of the rotary shaft (22), the fixing member (24) abutting both the guide ramps (423) simultaneously.

10. A printer, characterized by comprising a print roller unit including a print roller (5) supported by said housing (1) for supporting a fed recording medium (200), a printing mechanism (3), a driving mechanism, and a spacing assembly according to any one of claims 1 to 9, said printing mechanism (3) being supported by said housing (1), said printing mechanism (3) being disposed between said print roller unit and said spacing assembly;

the printing mechanism (3) can be driven by the driving mechanism to approach the printing roller (5) so as to record the printing content on the recording medium (200), or be driven by the driving mechanism to be far away from the printing roller (5) and abut against the cam (21) so as to limit the distance between the printing mechanism (3) and the printing roller (5).

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