CN116533650A - Printer core and printer - Google Patents

Abstract

The application discloses a printer core and printer. The printer core is provided with a plate spring between the frame and the heating element, and the plate spring is used for pressing the heating element forwards, so that a thermal head on the heating element is pressed on the outer peripheral surface of the paper feeding roller forwards, and a printing material driven by the paper feeding roller in a friction manner is heated; the plate spring is fixed by the frame and/or is propped against the first part backwards by the frame and is propped against the second part forwards by the frame, so that the plate spring is propped against the heating piece forwards at the third part; the second part is positioned between the first part and the third part along the up-down direction; the printer adopts the printer core. Compared with the printer core in the prior art, the technical scheme is thinner along the front-rear direction, so that the size of the printer is reduced, and the problem that characters, patterns or symbols printed on a printing material are uneven along the width direction can be further solved.

Description

Printer core and printer

Technical Field

The application relates to the field of printing devices, in particular to a printer core and a printer.

Background

In the prior art, the printer comprises a shell and a printer core, wherein the printer core is detachably fixedly connected with the shell and is accommodated in the shell, and a paper roll accommodating cavity is formed in the shell and used for accommodating paper rolls serving as printing materials. The printer core comprises a frame, a paper feeding roller, a heating piece, a spiral spring, a first flexible circuit board, a motor, a transmission gear set and a second flexible circuit board. The frame is suitable for being detachably fixedly connected with the shell, the paper feeding roller extends along the width direction, and the paper feeding roller is arranged on the frame and rotates around a rotation axis extending along the width direction relative to the frame so as to drive the printing material to move towards the paper outlet direction. The heating member extends in the width direction, and includes a thermal head and a pallet, the thermal head presses an outer circumferential surface of the paper feed roller to selectively heat a printing material frictionally driven by the paper feed roller to make characters, patterns or symbols appear on the printing material, and the thermal head is generally fixedly attached to the pallet. The plurality of spiral springs are arranged between the supporting plate and the frame and distributed along the width direction, the spiral springs press the supporting plate forwards and press the thermal head to the paper feeding roller forwards so as to apply positive pressure to the printing material. The first flexible circuit board is electrically connected with the thermal head and is used for supplying power to the thermal head and transmitting control signals to the thermal head. The motor drives the paper feeding roller to rotate through a transmission gear set, the motor is detachably fixedly connected to the frame, and the transmission gear set is generally accommodated in an accommodating cavity formed by the frame. The second flexible circuit board is electrically connected with the motor and is used for supplying power to the motor and transmitting control signals to the motor. The printer core in the above technical solution is often thicker along the front-back direction (i.e. the direction approximately equal to the direction in which the thermal head presses against the paper feeding roller), so that the printer becomes larger, and the printer is inconvenient for users to use. In addition, for some printing materials with longer width, the printed characters, patterns or symbols are often found to be thicker at one side along the width direction and thinner at one side, namely the problem that the characters, patterns or symbols printed by the printing materials are uneven along the width direction in the prior art is also solved.

Disclosure of Invention

It is an object of the present invention to overcome the above-mentioned drawbacks or problems with the prior art by providing a printer cartridge and a printer in which the printer cartridge is thinner in the front-rear direction than the prior art printer cartridge, thereby reducing the volume of the printer.

In order to achieve the above purpose, the following technical scheme is adopted:

a first technical aspect relates to a printer cartridge, comprising: a frame; a paper feed roller that rotates relative to the frame about a rotation axis extending in a width direction; the heating piece is arranged on the frame and is provided with a supporting plate and a thermal head fixedly connected to the front surface of the supporting plate, and the thermal head is pressed against the outer circumferential surface of the paper feeding roller forwards; and a leaf spring mounted to the frame; the support plate is fixed by the frame and/or is propped against the first part backwards, is propped against the second part forwards by the frame to deform the second part forwards, and is propped against the third part forwards; the second part is located between the first part and the third part along the up-down direction.

A second technical means is based on the first technical means, wherein the pallet extends in a width direction; the frame is propped against the supporting plate backwards, so that the supporting plate has the freedom degree of back and forth swinging; the leaf spring is provided with a substrate and at least two elastic pieces, the substrate extends along the width direction, the elastic pieces extend from the substrate perpendicular to the width direction, each elastic piece is arranged along the width direction, and at least one elastic piece is arranged on two sides of the position, where the supporting plate is propped backwards by the frame, along the left and right directions; the first part is positioned on the substrate, and the second part and the third part are positioned on the elastic sheet.

The third technical scheme is based on the second technical scheme, wherein each elastic piece is symmetrically arranged relative to a position where the supporting plate is propped against by the frame backwards along the width direction.

A fourth technical means is based on the second technical means, wherein the frame includes a front frame and a rear frame fixedly connected to each other; the front frame is provided with two side frames and a connecting frame, the two side frames support the paper feeding roller, the connecting frame is provided with a frame body, a first propping part, a second propping part and a positioning column, the frame body is connected with the two side frames, the first propping part and the second propping part protrude backwards from the frame body, the first propping part proppes against the supporting plate backwards, and the second propping part proppes against the substrate backwards at the first position; the rear frame is provided with a third propping part, and the third propping part props the elastic sheet at the second position forwards.

A fifth technical solution is based on the fourth technical solution, wherein the supporting plate is provided with a plate body and a first supporting leg protruding downwards from the middle of the plate body along the width direction, and the thermal head is fixedly connected to the plate body; the first abutting portion abuts the first leg rearward.

A sixth technical means is based on the fifth technical means, wherein the plate body is provided with a bending portion in an up-down direction, the bending portion extending in a width direction; ears are respectively arranged on two sides of the plate body; the surface of each side frame facing the other side frame is provided with a containing groove, the containing groove is provided with a backward opening, and the lug part is suitable for entering the containing groove from the opening and being contained in the containing groove.

The seventh technical scheme is based on the fourth technical scheme, further comprising a first flexible circuit board, wherein the first flexible circuit board is electrically connected with the thermal head and extends downwards from the middle part of the thermal head along the width direction, and the first propping part penetrates through the first flexible circuit board to prop against the first support leg; the number of the second propping parts is at least two, each second propping part is distributed along the width direction, and the first flexible circuit board passes through a first interval formed between two adjacent second propping parts; the rear frame is provided with a fourth propping part protruding backwards; the substrate is provided with a substrate body and a second support leg; the second support legs are located in the range of the first interval along the width direction, protrude downwards from the substrate body and penetrate through the rear frame; the fourth abutting portion abuts against the second leg rearward and the second abutting portion abuts against the substrate body so that a portion of the first portion in the width direction within the range of the first interval is located at the second leg and the remaining portion of the first portion in the width direction is located at the substrate body.

An eighth technical means is the video display device of the seventh technical means, wherein the number of the second legs is at least two, and each of the second legs is symmetrically disposed with respect to a position where the pallet is pushed rearward by the frame in a width direction.

The ninth technical means is based on the fourth technical means, wherein the rear frame is further provided with a fifth abutting portion opposite to the second abutting portion, and the fifth abutting portion and the second abutting portion clamp and fix the substrate at the first position.

A tenth technical means is based on the seventh technical means, wherein the connection frame is further provided with a positioning column protruding rearward from a rear end of the second abutting portion and penetrating the substrate to position the leaf spring; the number of the positioning columns is at least two, each positioning column is distributed along the width direction, and at least two positioning columns are positioned on two sides of the first flexible circuit board along the width direction.

An eleventh technical means is based on any one of the fourth to tenth technical means, further comprising a motor, a transmission gear set, and a second flexible circuit board; the frame also comprises a side cover, wherein the side cover is detachably and fixedly connected with the side frame on one side and forms a containing cavity; the motor is fixedly connected to the outer side of the side cover and drives the paper feeding roller to rotate through the transmission gear set; the transmission gear set is accommodated in the accommodating cavity; the second flexible circuit board is fixedly connected with the motor and is electrically connected with the motor; the rear frame is detachably connected with the frame body through a fastener.

A twelfth technical means is the printer of any one of the first to eleventh technical means, comprising a housing, the printer cartridge being detachably fixed to the housing and accommodated in the housing.

Compared with the prior art, the scheme has the following beneficial effects:

the first technical scheme adopts the leaf spring to prop against the heating piece, can make the printer core thinner along fore-and-aft direction for the technical scheme that adopts coil spring to the volume of printer has been reduced.

The first technical scheme is that a second part of the plate spring is arranged between a first part and a third part along the up-down direction, wherein the first part is defined as a part fixed and/or propped backward by the frame, the second part is defined as a part propped forward by the frame and deformed, and the third part is defined as a part propped forward by the frame and pressed against the supporting plate. The technical means has two technical effects compared with the technical scheme that the supporting plate is pressed only by the elastic force of the plate spring: firstly, the second part is pressed forwards by the frame to deform the plate spring, so that the pressing force of the plate spring for pressing the supporting plate forwards is larger, the force of the thermal head for pressing the outer circumferential surface of the paper feeding roller is larger, and the problem of uneven thickness of characters, patterns or symbols printed by a printing material along the width direction caused by uneven force of the thermal head for pressing the outer circumferential surface of the paper feeding roller along the width direction can be solved to a certain extent; secondly, because the second position is pushed forward by the frame and makes the leaf spring produce deformation, under the condition that the force of guaranteeing that the leaf spring pushes forward the layer board is enough, can make the leaf spring thinner, not only help making the printer core thinner along the fore-and-aft direction to reduce the volume of printer, also be favorable to reducing the cost of leaf spring, make printer core or printer have cost advantage more.

In the second technical solution, the degree of freedom in which the pallet swings back and forth is interpreted as the first end and the second end of the pallet in the width direction being capable of swinging forward or backward approximately around a swing fulcrum at which the pallet is pushed backward by the frame. The technical principle is that if the first end of the heating element in the width direction is farther away from the rotation axis of the paper feeding roller than the second end, then, because the spring plates are stressed and forced independently, the spring plates against the first end are more deformed backwards than the spring plates against the second end under the action of the heating element, so that the pressing force of the spring plates against the first end is larger than the pressing force of the spring plates against the second end, the unbalance of the force drives the first end of the heating element to swing forwards, and the second end of the heating element correspondingly swings backwards until the two pressing forces are approximately the same, thereby adaptively correcting the rotation axis of the heating element in the width direction. It should be noted that the deviation of the heating member in the width direction with respect to the rotation axis of the paper feed roller causes uneven force of the thermal head against the outer circumferential surface of the paper feed roller in the width direction, and thus is a cause of uneven shading of characters, patterns or symbols printed by the printing material in the width direction, so that the above-mentioned technical means can improve the uneven shading of characters, patterns or symbols printed by the printing material in the width direction.

According to the third technical scheme, the spring plates are symmetrically arranged at the positions which are propped against the supporting plate backwards by the frame along the width direction, so that the force exerted by the spring plates on the left side and the right side of the swing pivot point is consistent with the force arm of the swing pivot point, and when the force exerted by the spring plates on the heating member reaches balance, the swing moment exerted by the heating member on the two sides of the swing pivot point can also reach balance, and the heating member can be more favorable for exerting pressure and propping force on the paper feeding roller uniformly along the width direction.

In a fourth technical scheme, two side frames support the paper feeding roller, and a first propping part and a second propping part are arranged on the frame body connecting the two side frames in a protruding mode, so that the frame can serve as a common position reference of the paper feeding roller and the plate spring, and the technical effects of the first technical scheme to the third technical scheme are achieved. The rear frame is fixedly connected with the front frame, the rear frame is provided with a third propping part, the third propping part is propped against the elastic sheet forwards, so that the plate spring and the rear frame are assembled on the front frame, the function of enabling the frame to prop against the second part of the plate spring forwards to deform can be achieved, and the assembly process is simple.

In the fifth technical scheme, the first propping part protrudes forwards from the frame body and props against the first supporting leg of the supporting plate, the thermal head is fixedly connected to the plate body, and the first supporting leg protrudes downwards from the plate body, so that the supporting plate has the freedom degree of front-back swing when being pressed by the plate spring, and the heating part is more favorable for being pressed against the paper feeding roller in a relatively balanced mode along the width direction.

In the sixth technical scheme, the plate body is equipped with the kink that extends along width direction along upper and lower direction, is favorable to reinforcing plate body along width direction's rigidity to can set up the plate body thinner, also can make the printer core become thinner.

In the seventh technical solution, the first flexible circuit board extends downward from the middle of the thermal head in the width direction, which is more favorable for connection of the printer core and other devices, such as a power device and a control device.

In the seventh technical solution, in the case where the first flexible circuit board passes between the front frame and the pallet (as known from the first abutting portion penetrating the first flexible circuit board to abut against the first leg), the front frame cannot provide the second abutting portion that abuts against the substrate rearward in the range where the first flexible circuit board passes. At this time, the fourth propping part of the second supporting leg of the substrate is propped backwards at the rear frame, the leaf spring can be provided with the first part propped backwards by the frame in the area where the first flexible circuit board passes, and the matching elastic sheet is propped forwards by the third propping part, so that the related technical effects of the first technical scheme can be obtained in the area.

In the eighth technical scheme, the number of the second supporting legs is at least two, and the second supporting legs are symmetrically arranged at the positions which are propped against the supporting plate backwards by the frame along the width direction, so that the force of the second supporting legs on the left side and the right side of the swinging supporting point, which are propped against forwards by the fourth propping parts, is kept consistent relative to the force arm of the swinging supporting point, and when the force applied to the heating element by the inner plate spring in the area penetrated by the first flexible circuit board reaches balance, the swinging moment born by the heating element on the two sides of the swinging supporting point can also reach balance, and the heating element is more favorable for uniformly applying pressure and propping force to the paper feeding roller along the width direction.

The ninth technical solution is a specific embodiment in which the plate spring is fixed by the frame to form the first portion by being disposed on the fifth abutting portion opposite to the second abutting portion, and the substrate is clamped and fixed by the fifth abutting portion and the second abutting portion, and of course, other specific embodiments may be provided in which the plate spring is fixed by the frame, for example, by fastening with a screw or the like.

In the tenth technical scheme, the locating column penetrates through the leaf spring, so that the leaf spring is conveniently located and assembled to the frame, the locating column protrudes backwards from the rear end of the second propping part and the second propping part backwards props against the leaf spring at the first position, and when the leaf spring is assembled to the frame, the locating frame can backwards prop against the first position of the leaf spring. The rear frame is fixedly connected with the front frame, the rear frame is provided with a third propping part, the third propping part is propped against the elastic sheet forwards, so that the plate spring and the rear frame are assembled on the front frame, the function of enabling the frame to prop against the second part of the plate spring forwards to deform can be achieved, and the assembly process is simple. In the fifth technical scheme, at least two locating columns are located on two sides of the first flexible circuit board along the width direction, so that the leaf springs are prevented from shaking up and down along two ends of the width direction, and the leaf springs are located more accurately.

In the eleventh technical solution, the motor is fixedly connected to the outer side of the side cover, which is favorable for heat dissipation.

A twelfth technical means accordingly has the technical effects of the printer cartridge in the first to eleventh technical means as recited therein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments, the following brief description of the drawings is provided, in which:

FIG. 1 is a perspective view of a printer cartridge according to a first embodiment;

FIG. 2 is an exploded perspective view of a printer cartridge according to the first embodiment;

FIG. 3 is a perspective view of a front frame in accordance with the first embodiment;

FIG. 4 is a rear view of a printer cartridge according to the first embodiment;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;

FIG. 6 is a B-B cross-sectional view of FIG. 4;

FIG. 7 is a C-C cross-sectional view of FIG. 4;

FIG. 8 is a schematic diagram of a printer core according to the second embodiment;

fig. 9 is a schematic structural view of a printer cartridge in the third embodiment;

fig. 10 is a schematic structural view of a printer cartridge in the fourth embodiment.

The main reference numerals illustrate:

1. a printer core; 2. a frame; 3. a paper feed roller; 4. a heating member; 5. a leaf spring; 6. a first flexible circuit board; 7. a motor; 8. a drive gear set; 9. a second flexible circuit board; 10. a front frame; 11. a rear frame; 12. a side cover; 13. a side frame; 14. a connecting frame; 15. a groove; 16. a receiving groove; 17. a connection part; 18. a frame body; 19. a paper guide surface; 20. a first abutting portion; 21. a second abutting portion; 22. positioning columns; 23. a connecting column; 24. a first vertical wall; 25. a first horizontal wall; 26. a second vertical wall; 27. a second horizontal wall; 28. a third abutting portion; 29. positioning holes; 30. a fifth abutting portion; 31. a first hole; 32. a fourth abutting portion; 33. a connection hole; 34. a first screw; 35. a second screw; 36. a supporting plate; 37. a thermal head; 38. a plate body; 39. a first leg; 40. an ear; 41. a bending part; 42. a substrate; 43. a spring plate; 44. a substrate body; 45. a second leg; 46. a support hole; 47. a first portion; 48. a second portion; 49. a third portion; 50. a second hole; 51. a third screw; 52. in the width direction.

Detailed Description

In the claims and in the description, unless otherwise defined, the terms "first," "second," or "third," etc., are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims and the specification, unless otherwise defined, the term "up-down direction" is a double arrow direction, which is a collection of "up", "down" directions in the drawings of the specification; the term "widthwise" is a double arrow direction and should be interpreted as indicated in the drawings associated with the specification; the terms "front", "rear", "upper", "lower" are all single arrow directions and should be interpreted as indicated in the drawings to which the description relates.

In the claims and specification, unless otherwise defined, the terms "fixedly coupled" and "fixedly connected" are to be construed broadly as any manner of connection without a displacement relationship or relative rotational relationship therebetween, and that is to say include non-detachably fixedly connected, integrally connected, and fixedly connected by other means or elements.

In the claims and specification, unless otherwise defined, the terms "comprising," having, "and variations thereof mean" including but not limited to.

In the claims and the description, unless otherwise defined, the term "symmetrically arranged in the width direction with respect to the position where the pallet is pushed back by the frame" shall be interpreted as meaning that the respective elastic portion or the respective second leg forms a number of first projections on the rotation axis and that the position where the pallet is pushed back by the frame forms a second projection on the rotation axis, wherein the portion of the respective first projections on one side of the second projection is substantially symmetrical with the portion on the other side of the second projection with respect to the second projection, and that the first projections are also substantially symmetrical with respect to the second projection if there is a first projection crossing the midpoint.

In the claims and specification, unless otherwise defined, the term "provided" means that a feature located after the term is subordinate to a feature located before the term.

The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings.

Example 1

Referring to fig. 1 and 2, fig. 1 and 2 show a printer core 1 in an embodiment. As shown in fig. 2, the printer cartridge 1 includes a frame 2, a paper feed roller 3, a heating member 4, a plate spring 5, a first flexible circuit board 6, a motor 7, a transmission gear set 8, and a second flexible circuit board 9.

As shown in fig. 2, the frame 2 includes a front frame 10, a rear frame 11, and side covers 12 fixedly coupled to each other.

As shown in fig. 3, the front frame 10 is provided with two side frames 13 and a link frame 14 integrally connected to each other. The upper ends of both side frames 13 are provided with grooves 15, and the grooves 15 are for supporting the feed roller 3 and allowing the feed roller 3 to rotate relative to the frame 2 about a rotation axis extending in the width direction 52. The surface of each side frame 13 facing the other side frame 13 is provided with a receiving groove 16. The receiving groove 16 is provided with a rearward opening. As shown in fig. 4, the surface of each side frame 13 facing away from the other side frame 13 is also provided with a connecting portion 17 protruding outward in the width direction 52, and the connecting portion 17 is provided with a through hole penetrating in the front-rear direction. As shown in fig. 3, the connection frame 14 is provided with a frame body 18, a first abutting portion 20, a second abutting portion 21, a positioning column 22, and a connection column 23. The frame 18 extends in the width direction 52 and connects the two side frames 13. As shown in fig. 1, the front surface of the frame 18 forms a paper guide surface 19 for guiding the printing material between the paper feed roller 3 and the heating member 4. As shown in fig. 3, the first abutting portion 20 protrudes rearward from the rear surface of the middle portion of the frame 18. The number of the second propping parts 21 is two, and the two second propping parts 21 are distributed along the width direction 52 and are positioned at two sides of the first propping part 20. Each of the second abutments 21 has a plate shape protruding rearward from the rear surface of the frame 18. The positioning post 22 protrudes rearward from the rear end of the second abutment 21. Each second supporting portion 21 is connected with two positioning columns 22, and each positioning column 22 is arranged along the width direction 52. Two of the positioning posts 22 are located at one side of the first supporting portion 20, and the other two positioning posts 22 are located at the other side of the first supporting portion 20. In other embodiments, the number of the second propping portions 21 may be more than two, and the number of the positioning posts 22 may be fewer or greater. In this embodiment, two connection posts 23 are further disposed below each second abutting portion 21, and a threaded hole is formed in a rear end surface of each connection post 23.

As shown in fig. 2, the rear frame 11 extends in the width direction 52. The rear frame 11 is provided with a first vertical wall 24, a first horizontal wall 25, a second vertical wall 26, and a second horizontal wall 27 in this order from the top down. Wherein the first vertical wall 24 is disposed opposite to the second abutting portion 21, and the upper end of the first vertical wall 24 forms a third abutting portion 28 protruding forward, in this embodiment, the third abutting portion 28 has a dimension along the up-down direction. The first vertical wall 24 is provided with four positioning holes 29, and each positioning hole 29 is provided corresponding to the positioning column 22 and is arranged along the width direction 52. The first horizontal wall 25 is provided with two first holes 31 penetrating the first horizontal wall 25 along the width direction 52, and the two first holes 31 are symmetrically arranged with respect to the first abutting portion 20 along the width direction 52. The second vertical wall 26 is provided with two fourth propping portions 32 protruding rearward, and the two fourth propping portions 32 are respectively disposed corresponding to the first holes 31 and below the first holes 31. The second vertical wall 26 is further provided with four connection holes 33 penetrating the second vertical wall 26 in the width direction 52, and the connection holes 33 are provided corresponding to the connection posts 23. The connection hole 33 is adapted to be penetrated by a first screw 34, the first screw 34 being adapted to be screwed with a threaded hole on the connection post 33.

As shown in fig. 2, the side cover 12 is detachably and fixedly connected with the side frame 13 at one side by a second screw 35 and forms a receiving cavity.

As shown in fig. 1 and 3, the feed roller 3 is supported by the grooves 15 on the two side frames 13, and the feed roller 3 rotates relative to the frame 2 about a rotation axis extending in the width direction 52 to move the printing material by friction.

As shown in fig. 5, the heating member 4 extends in the width direction 52, and is provided with a pallet 36 and a thermal head 37, the thermal head 37 being fixedly attached to the front surface of the pallet 36, the thermal head 37 being for selectively heating the printing material friction-driven by the paper feed roller 3 and causing the printing material to display letters, patterns or symbols. As shown in fig. 2, the pallet 36 is provided with a plate body 38 and a first leg 39, the plate body 38 extending in a width direction 52. Ears 40 are provided on both sides of the plate 38, as shown in fig. 4, and the ears 40 are adapted to enter the receiving groove 16 from the opening of the receiving groove 16 and be received in the receiving groove 16, and the ears 40 are also adapted to be retained by the rearwardly facing front groove wall of the receiving groove 16. The plate 38 has a bent portion 41 at an upper portion in the up-down direction. The heating element 4 is fixedly connected to the upper portion of the front surface of the plate 38 and is positioned at the lower portion of the bending portion 41. The first leg 39 protrudes downward from the middle of the plate body 38 in the width direction 52, and the first leg 39 is adapted to be pushed rearward by the first pushing portion 20.

As shown in fig. 2, the leaf spring 5 is provided with a base 42 and at least two spring plates 43. The substrate 42 is provided with a substrate body 44 and two second legs 45. The substrate body 44 extends in a width direction 52, and the substrate body 44 is provided with four support holes 46 adapted to be penetrated by the positioning posts 22. The second leg 45 extends downward from the substrate body 44 and is adapted to be pushed rearward by the fourth pushing portion 32 after penetrating the first hole 31. The two second legs 45 are symmetrically disposed with respect to the first abutment 20 in the width direction 52. In this embodiment, the number of the elastic pieces 43 is six, the elastic pieces 43 extend upward from the substrate body 44, each elastic piece 43 is disposed along the width direction 52, and at least one elastic piece 36 is disposed on each side of the first abutting portion 20 (the position where the supporting plate 36 is abutted backward by the frame 2) along the left-right direction. The spring plates 43 are symmetrically disposed with respect to the first abutting portion 20 along the width direction 52.

As shown in fig. 2, the first flexible circuit board 6 is electrically connected to the thermal head 37 for supplying power to the thermal head 37 and transmitting control signals. The first flexible circuit board 6 extends downward from the center of the thermal head 37 in the width direction. The first flexible circuit board 6 is provided with a second hole 50 at a position corresponding to the first support leg 39, and the second hole 50 is penetrated by the first propping part 20 to prop against the first support leg 39. The first flexible circuit board 6 is configured to be adapted to pass through a first space formed between two adjacent second abutments 21 in the width direction 52.

As shown in fig. 2, the motor 7 is fixedly connected to the outer side of the side cover 12, and is used for generating power and driving the paper feeding roller 3 to rotate through the transmission gear set 8.

As shown in fig. 2, the driving gear set 8 is configured to be accommodated in an accommodating chamber formed by the side cover 12 and the side frame 13, and has an input end engaged with a gear on an output shaft of the motor 7 and an output end engaged with a gear on a shaft of the paper feeding roller 3 to realize a driving function, and may also have a deceleration function in this embodiment.

As shown in fig. 2, the second flexible circuit board 9 is configured to be adapted to be fixedly connected and electrically connected to the motor 7 for powering the motor 7 and transmitting control signals.

Referring to fig. 5, 6 and 7, fig. 5, 6 and 7 are schematic structural views of the printer cartridge 1 of the present embodiment after assembly.

As shown in fig. 7, after the printer core 1 is assembled, the first screw 34 penetrates through the positioning hole 29 and is screwed with the threaded hole on the connecting post 23, so that the front frame 10 and the rear frame 11 are detachably fixed together. As shown in fig. 2, the side cover 12 is detachably fastened to the side frame 13 at one side by a second screw 35 to form a receiving cavity.

As shown in fig. 7, the paper feed roller 3 is rotatably supported in the grooves 15 of the two side frames 13, and the thermal head 37 is fixedly attached to the front surface of the plate 38 and pressed forward against the outer peripheral surface of the paper feed roller 3. As shown in fig. 4, the two ears 40 enter the receiving groove 16 from the opening of the receiving groove 16 and are received in the receiving groove 16. As shown in fig. 2, the motor 7 is fixedly connected to the outer side of the side cover 12 through a third screw 51, and drives the paper feed roller 3 through the driving gear set 8. The drive gear set 8 is accommodated in the accommodation chamber. The first flexible circuit board 6 is fixedly connected and electrically connected with the thermal head 37, and the first flexible circuit board 6 also passes through the first interval between the two second propping portions 21. The second flexible circuit board 9 is fixedly connected with the board body 38 and is thus fixed relative to the motor 7 and electrically connected with the motor 7.

As shown in fig. 7, the positioning posts 22 penetrate through the support holes 46 in the substrate body 44 and extend into the positioning holes 29, thereby supporting and positioning the leaf springs 5.

As shown in fig. 6, each of the second legs 45 is pushed back against the first portion 47 of the leaf spring 5 by the fourth pushing portion 32 through the first hole 31 within the first interval in the width direction 52. In the width direction 52, the middle portion of the spring piece 43 is further pushed forward against the second portion 48 of the leaf spring 5 by the third pushing portion 28 within the first interval range, specifically, both the upper end and the lower end of the third pushing portion 28 abut against the rear surface of the spring piece 43, so that the spring piece 43 deforms forward, and therefore, the portion of the spring piece 43 in contact with the third pushing portion 28 belongs to the second portion 48. The upper portion of the elastic piece 43 also abuts forward against the rear surface of the pressing plate body 38 in the width direction 52 within the first interval range. Thus, the second portion 48 of the leaf spring 5 is located above the first portion 47 and below the third portion 49 within the first interval in the width direction 52.

As shown in fig. 7, outside the first interval range along the width direction 52, the two second propping portions 21 are propped against the substrate body 44 backward, and the first vertical wall 24 is used as the fifth propping portion 30 opposite to the second propping portion 21 to clamp and fix the substrate body 44 at the first portion 47 together with the second propping portion 21. Outside the first interval range in the width direction 52, the middle part of the spring piece 43 is further pushed forward by the third pushing portion 28 against the second part 48 of the leaf spring 5, specifically, both the upper end and the lower end of the third pushing portion 28 abut against the rear surface of the spring piece 43, so that the spring piece 43 deforms forward, and therefore, the part of the spring piece 43 in contact with the third pushing portion 28 belongs to the second part 48. Outside the first interval range in the width direction 52, the upper portion of the elastic piece 43 also presses forward against the rear surface of the pressing plate body 38. Thus, outside the first interval range in the width direction 52, the second portion 48 of the leaf spring 5 is also located above the first portion 47 and below the third portion 49.

As shown in fig. 5, the first abutting portion 20 abuts against the first leg 39 through the second hole 50, so that the pallet 36 has a degree of freedom of swinging back and forth. As shown in fig. 2, the spring pieces 43 are symmetrically arranged in the width direction and the second legs 45 are symmetrically arranged in the width direction with respect to the position where the pallet 36 is abutted by the first abutting portion 20.

The printer (not shown in the drawings) in this embodiment includes a housing and a printer cartridge 1, and a through hole in a connecting portion 17 of the printer cartridge 1 is used to achieve detachable fastening with the housing by a screw, and the printer cartridge 1 is also accommodated in the housing.

In this embodiment, the plate spring 5 is used to press the heating element 4, so that the printer core 1 can be thinner in the front-rear direction compared with the technical scheme of using a coil spring, thereby reducing the volume of the printer.

The present embodiment places the second portion 48 of the leaf spring 5 in the up-down direction between the first portion 47 and the third portion 49, wherein the first portion 47 is defined as a portion that is fixed and/or pushed rearward by the frame 2, the second portion 48 is defined as a portion that is pushed forward by the frame 2 and deforms it, and the third portion 49 is defined as a portion that is pushed forward against the pallet 36. The above technical means has two technical effects compared with the technical scheme that the supporting plate 36 is pressed only by the elastic force of the plate spring 5 itself: firstly, as the second part 48 is pressed forwards by the frame 2 to deform the plate spring 5, the pressing force of the plate spring 5 to press the supporting plate 36 forwards is larger, the force of the thermal head 37 to press the outer circumferential surface of the paper feeding roller 3 is larger, and the problem of uneven thickness of characters, patterns or symbols printed by printing materials along the width direction caused by uneven force of the thermal head 37 to press the outer circumferential surface of the paper feeding roller 3 can be solved to a certain extent; secondly, since the second portion 48 is pressed forward by the frame 2 to deform the plate spring 5, the plate spring 5 can be made thinner under the condition that the force of pressing the plate spring 5 forward against the supporting plate 36 is enough, which is helpful to make the printer core 1 thinner along the front-back direction, thereby reducing the volume of the printer, reducing the cost of the plate spring 5 and making the printer core 1 or the printer more cost-effective.

In the present embodiment, the degree of freedom in which the pallet 36 swings back and forth is interpreted as the first end and the second end of the pallet 36 in the width direction 52 being capable of swinging forward or backward approximately around the swing fulcrum at which the pallet 36 is pushed backward by the frame 2. The specific technical principle is that if the first end of the heating element 4 in the width direction 52 is farther away from the rotation axis of the paper feeding roller 3 than the second end, then, because the respective spring plates 43 are independently stressed and forced against each other, the spring plates 43 against the first end are more deformed backwards than the spring plates 43 against the second end under the action of the heating element 4, so that the pressing force of the spring plates 43 against the first end is greater for the first end of the heating element 4 than for the second end of the heating element 4, and the unbalance of the force drives the first end of the heating element 4 to swing forward and the corresponding second end of the heating element 4 to swing backward until the same pressing force of the spring plates 43 against the second end of the heating element 4 is applied to the rotation axis of the paper feeding roller 3, thereby adaptively correcting the width of the paper feeding roller 3. It should be noted that such a deflection of the heating member 4 in the width direction 52 with respect to the rotation axis of the paper feed roller 3 will cause uneven force of the thermal head 37 against the outer peripheral surface of the paper feed roller 3 in the width direction 52, and thus is a cause of uneven shading of characters, patterns or symbols printed by the printing material in the width direction, so that the above-described technical means can improve the uneven shading of characters, patterns or symbols printed by the printing material in the width direction.

In this embodiment, the spring plates 43 are symmetrically arranged with respect to the position where the supporting plate 36 is propped against by the frame 2 backward along the width direction 52, which is beneficial to keeping the force applied by the spring plates 43 to the heating element 4 on the left and right sides of the swing fulcrum consistent with respect to the arm of force of the swing fulcrum, so that when the force applied by the spring plates 43 to the heating element 4 reaches balance, the swing moment applied by the heating element 4 on both sides of the swing fulcrum can reach balance, and is beneficial to making the heating element 4 uniformly apply pressure to the paper feeding roller 3 along the width direction 52.

In this embodiment, the two side frames 13 support the paper feed roller 3 while the first abutting portion 20 and the second abutting portion 21 are projected from the frame body 18 connecting the two side frames 13, so that the frame 2 can serve as a common positional reference for the paper feed roller 3 and the leaf spring 5. The rear frame 11 is fixedly connected with the front frame 10, the rear frame 11 is provided with a third propping part 28, and the third propping part 28 is propped against the elastic sheet 43 forwards, so that after the plate spring 5 and the rear frame 11 are assembled to the front frame 10, the function of enabling the frame 2 to prop against the second part 48 of the plate spring 5 forwards to deform can be realized, and the assembly process is simple.

In this embodiment, the first propping portion 20 protrudes forward from the frame 18 and props against the first leg 39 of the supporting plate 36, and the thermal head 37 is fixedly connected to the plate 38, and the first leg 39 protrudes downward from the plate 38, so that the supporting plate 36 has a degree of freedom of swinging back and forth when being pressed by the plate spring 5, which is more beneficial to the heating element 4 being pressed against the paper feeding roller 3 relatively evenly along the width direction 52.

In the present embodiment, the plate body 38 is provided with the bent portion 41 extending in the width direction 52 in the up-down direction, which is advantageous in that the rigidity of the plate body 38 in the width direction 52 can be enhanced, so that the plate body 38 can be made thinner, and the printer core 1 can also be made thinner.

In this embodiment, the first flexible circuit board 6 extends downward from the middle of the thermal head 37 in the width direction 52, which is more advantageous for connection of the printer core 1 to other devices, such as a power supply device and a control device.

In the present embodiment, in the case where the first flexible circuit board 6 passes between the front frame 10 and the pallet 36 (as known from the first abutting portion 20 penetrating the first flexible circuit board 6 to abut the first leg 39), the front frame 10 cannot be provided with the second abutting portion 21 that abuts the substrate 42 rearward in the range where the first flexible circuit board 6 passes. At this time, the fourth abutting portion 32 of the second leg 45 abutting the substrate 42 rearward is provided on the rear frame 11, and the leaf spring 5 can be provided with the first portion 47 abutting rearward by the frame 2 also in the area where the first flexible circuit board 6 passes, and the engaging elastic piece 43 is abutted forward by the third abutting portion 28, so that the elastic piece 43 can also have a stronger force of pressing against the pallet 36 in this area.

In this embodiment, the number of the second legs 45 is two, and the second legs 45 are symmetrically arranged along the width direction 52 relative to the position where the supporting plate 36 is propped backward by the frame 2, which is also beneficial to keeping the force of the second legs 45 propped forward by the fourth propping portion 32 on the left and right sides of the swinging fulcrum consistent with respect to the arm of force of the swinging fulcrum, so that when the force exerted on the heating element 4 by the leaf spring 5 in the area where the first flexible circuit board 6 passes through reaches balance, the swinging moment exerted on both sides of the swinging fulcrum by the heating element 4 can reach balance, and is more beneficial to making the heating element 4 uniformly exert the pressing propping force on the paper feeding roller 3 along the width direction 52.

In this embodiment, the fifth abutting portion 50 is provided opposite to the second abutting portion 21, and the substrate 42 is clamped and fixed between the fifth abutting portion 50 and the second abutting portion 21, so that the plate spring 5 is fixed by the frame 2 to form the first portion 47, but other embodiments are possible, such as fastening by screws, for example.

In this embodiment, the positioning post 22 penetrates the leaf spring 5 to facilitate positioning and assembling of the leaf spring 5 to the frame 2, the positioning post 22 protrudes backward from the rear end of the second abutting portion 21 and the second abutting portion 21 abuts against the leaf spring 5 at the first portion 47 backward, so that the leaf spring 5 can position the frame 2 against the first portion of the leaf spring 5 backward when assembled to the frame 2. At least two positioning posts 22 are positioned on two sides of the first flexible circuit 6 board along the width direction 52, which is beneficial to preventing the plate spring 5 from shaking up and down along the two ends of the width direction 52, so that the plate spring 5 is positioned more accurately.

In this embodiment, the motor 7 is fixedly connected to the outer side of the side cover 12, which is beneficial to heat dissipation.

Example two

Referring to fig. 8, fig. 8 shows the structure of the second embodiment. As shown in fig. 8, the only difference between the present embodiment and the first embodiment is that the third abutting portion 28 is thinned in the up-down direction so that, in cross section, the third abutting portion 28 has only one contact point with the rear surface of the elastic piece 43, instead of two in the first embodiment. At this time, the position on the elastic sheet 43 corresponding to the contact point is the second portion 48. Based on the technical principles disclosed in the present application, this embodiment can also achieve the effects of thinning the printer core 1 and improving the problem of uneven shading of characters, patterns or symbols printed by the printing material along the width direction.

Example III

Referring to fig. 9, fig. 9 shows the structure of the third embodiment. As shown in fig. 9, the first embodiment is different from the second embodiment in that the first vertical wall 24 no longer clamps the substrate 42 with the second abutting portion 21, and the second abutting portion 21 still abuts the substrate 42 at the first portion 47. So that when the third propping portion 28 is propped against the elastic sheet 43 forwards at the second portion 48, the portion of the substrate 42 located at the lower portion of the positioning post 22 is deflected backwards. Meanwhile, in the present embodiment, the second leg 45 is no longer provided to the substrate 42, and the first hole 31 and the fourth abutting portion 32 are no longer provided to the rear frame 11. As can be seen from the technical principle disclosed in the present application, even if the substrate 42 is not fixed by the frame 2 but is pushed back by the second pushing portion 21 only at the first portion 47, the present embodiment can also have the effect of thinning the printer core 1 and improving the problem of uneven shading of characters, patterns or symbols printed by the printing material along the width direction.

Example IV

Referring to fig. 10, fig. 10 shows the structure of the fourth embodiment. As shown in fig. 10, the present embodiment is different from the third embodiment in that, as with the embodiment, the substrate 42 of the present embodiment is provided with the second leg 45, and the rear frame 11 is provided with the first hole 31 and the fourth abutting portion 32. The second leg 45 is pushed rearward by the fourth pushing portion 32 through the first hole 31. Based on the technical principles disclosed in the present application, this embodiment can also achieve the effects of thinning the printer core 1 and improving the problem of uneven shading of characters, patterns or symbols printed by the printing material along the width direction.

The foregoing description of the specification and examples is provided to illustrate the scope of the application and is not intended to limit the scope of the application.

Claims (12)

1. A printer cartridge (1), characterized by comprising:

a frame (2);

a paper feed roller (3) which rotates relative to the frame (2) about a rotation axis extending in the width direction;

a heating element (4) which is arranged on the frame (2) and is provided with a supporting plate (36) and a thermal head (37) fixedly connected to the front surface of the supporting plate (36), wherein the thermal head (37) forwards presses against the outer circumferential surface of the paper feeding roller (3); and

a leaf spring (5) mounted on the frame (2); which is fixed by the frame (2) and/or is pushed back against a first portion (47), which is also pushed forward against a second portion (48) by the frame (2) to deform it, which also pushes forward against the pallet (36) against a third portion (49); the second portion (48) is located between the first portion (47) and the third portion (49) in the up-down direction.

2. A printer cartridge (1) according to claim 1, characterized in that: the pallet (36) extends in the width direction;

the frame (2) is propped against the supporting plate (36) backwards, so that the supporting plate (36) has the freedom of swinging back and forth; the leaf spring (5) is provided with a substrate (42) and at least two elastic pieces (43), the substrate (42) extends along the width direction, the elastic pieces (43) extend from the substrate (42) perpendicular to the width direction, each elastic piece (43) is distributed along the width direction, and at least one elastic piece (43) is arranged on two sides of the position, where the supporting plate (36) is propped against by the frame (2) backwards, along the left-right direction; the first portion (47) is located on the substrate (42), and the second portion (48) and the third portion (49) are located on the elastic sheet (43).

3. A printer cartridge (1) as claimed in claim 2, wherein each of said elastic pieces (43) is arranged symmetrically in the width direction with respect to a position where said pallet (36) is pushed rearward by said frame (2).

4. A printer cartridge (1) according to claim 2, characterized in that:

the frame (2) comprises a front frame (10) and a rear frame (11) which are fixedly connected with each other; the front frame (10) is provided with two side frames (13) and a connecting frame (14), the two side frames (13) support the paper feeding roller (3), the connecting frame (14) is provided with a frame body (18), a first propping part (20) and a second propping part (21), the frame body (18) is connected with the two side frames (13), the first propping part (20) and the second propping part (21) are protruded backwards from the frame body (18), the first propping part (20) is propped backwards against the supporting plate (36), and the second propping part (21) is propped backwards against the substrate (42) at the first position (47); the rear frame (11) is provided with a third propping part (28), and the third propping part (28) is used for propping the elastic sheet (43) forward at the second position (48).

5. A printer core (1) according to claim 4, wherein said pallet (36) is provided with a plate body (38) and a first leg (39) protruding downward from a widthwise middle portion of said plate body (38), said thermal head (37) being fixedly attached to said plate body (38); the first abutment (20) abuts the first leg (39) rearwardly.

6. A printer core (1) according to any one of claims 5, wherein said plate body (38) is provided with a bent portion (41) in the up-down direction, said bent portion (41) extending in the width direction; ears (40) are respectively arranged on two sides of the plate body (38); the surface of each side frame (13) facing the other side frame (13) is provided with a containing groove (16), the containing groove (16) is provided with a backward opening, and the lug (40) is suitable for entering the containing groove (16) from the opening and being contained in the containing groove (16).

7. A printer cartridge (1) as claimed in claim 4, characterized in that:

the thermal head comprises a thermal head (37), and is characterized by further comprising a first flexible circuit board (6), wherein the first flexible circuit board (6) is electrically connected with the thermal head (37) and downwards extends from the middle part of the thermal head (37) along the width direction, and the first propping part (20) penetrates through the first flexible circuit board (6) to prop against the supporting plate (36);

the number of the second propping parts (21) is at least two, each second propping part (21) is distributed along the width direction, and the first flexible circuit board (6) passes through a first interval formed between two adjacent second propping parts (21); the rear frame (11) is provided with a fourth propping part (32) protruding backwards;

The substrate (42) is provided with a substrate body (44) and a second support leg (45); the second leg (45) is located within the range of the first interval in the width direction, and the second leg (45) protrudes downward from the substrate body (44) and penetrates the rear frame (11);

the fourth abutting portion (32) abuts against the second leg (45) rearward and the second abutting portion (21) abuts against the substrate body (44) rearward so that a portion of the first portion (47) in the width direction within the range of the first interval is located at the second leg (45) and the remaining portion of the first portion (47) in the width direction is located at the substrate body (44).

8. A printer cartridge (1) as claimed in claim 7, characterized in that: the number of the second support legs (45) is at least two, and the second support legs (45) are symmetrically arranged relative to the position where the supporting plate (36) is propped against the frame (2) backwards along the width direction.

9. A printer cartridge (1) as claimed in claim 4, wherein said rear frame (11) is further provided with a fifth abutment (30) opposite said second abutment (21), said fifth abutment (30) clamping said substrate (42) to said first portion (47) with said second abutment (21).

10. A printer cartridge (1) as claimed in claim 7, wherein said connecting frame is further provided with a positioning post (22), said positioning post (22) protruding rearward from the rear end of said second abutment (21) and penetrating said substrate (42) to position said leaf spring (5); the number of the positioning columns (22) is at least two, each positioning column (22) is distributed along the width direction, and at least two positioning columns (22) are positioned on two sides of the first flexible circuit board (6) along the width direction.

11. A printer cartridge (1) as claimed in any one of claims 4 to 10, further comprising a motor (7), a drive gear set (8) and a second flexible circuit board (9); the frame (2) further comprises a side cover (12), and the side cover (12) is detachably and fixedly connected with a side frame (13) at one side to form a containing cavity; the motor (7) is fixedly connected to the outer side of the side cover (12) and drives the paper feeding roller (3) to rotate through the transmission gear set (8); the transmission gear set (8) is accommodated in the accommodating cavity; the second flexible circuit board (9) is fixedly connected with the motor (7) and is electrically connected with the motor; the rear frame (11) is detachably connected with the frame body (18) through a fastener.

12. Printer comprising a housing, characterized in that it further comprises a printer cartridge (1) according to any one of claims 1 to 11, said printer cartridge (1) being removably secured to said housing and housed in said housing.