CN108016143B

CN108016143B - Palm printer

Info

Publication number: CN108016143B
Application number: CN201711460302.7A
Authority: CN
Inventors: 林锦毅; 郑财权; 黄耀炜
Original assignee: Xiamen Hanyin Electronic Technology Co Ltd
Current assignee: Xiamen Hanyin Co ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2024-01-19
Anticipated expiration: 2037-12-28
Also published as: CN108016143A

Abstract

The invention provides a palm printer, which comprises a shell and a cover, wherein the cover is detachably arranged on the shell, a containing cavity is arranged in the shell and is divided into an upper cavity and a lower cavity, the upper cavity is provided with a push-broach mechanism, the lower cavity is divided into a left cavity and a right cavity, a reel and a transmission unit are sequentially arranged in the left cavity front and back, a storage battery and a control unit are sequentially arranged in the right cavity front and back, and a printing component is arranged between the left cavity and the right cavity; the scroll is used for sleeving recording paper, and the recording paper sequentially passes through the printing component and the push-type knife mechanism and is output from the output port of the shell. Each mechanism and each unit are reasonably arranged, the space of the containing cavity is effectively utilized, the printer is further miniaturized and light, and the printer can be conveniently held in the hand for use.

Description

Palm printer

Technical Field

The invention relates to the technical field of printers, in particular to a palm printer.

Background

Printers are classified into thermal printers, thermal transfer printers, inkjet printers, and the like, and among them, thermal printers are widely used for printing labels, receipts, and tickets in cash registers, portable terminals, and the like, due to their characteristics of miniaturization, light weight, simple structure, and the like.

The printing unit performs a printing operation in a state in which the platen roller is in pressure contact with the thermal head, and the thermal head is moved to a printing position by an external force accompanying a closing operation of the printer cover. However, there is often a complicated switching mechanism for driving the thermal head, and a lack of a judging mechanism for judging the switching in place, which causes a problem in the cooperation of the thermal head and the rubber roller, and affects the operation of the printing unit.

In addition, the cutting structure of the recording paper is movable to slide relative to the fixed blade, and cuts the recording paper by sandwiching the recording paper between the movable blade and the fixed blade. However, the mechanism for driving the movable blade to move is often complex, occupies a large space of the printer, and has a problem of inconvenience in manual operation.

Disclosure of Invention

The invention provides a palm printer, which aims to solve the problems that the existing printer is large in size and cannot be held in hands to operate, recording paper is difficult to cut and the like.

The invention is realized in the following way:

the palm printer comprises a shell and a cover, wherein the cover is detachably arranged on the shell, a containing cavity is formed in the shell and divided into an upper cavity and a lower cavity, the upper cavity is provided with a push-type knife mechanism, the lower cavity is divided into a left cavity and a right cavity, a reel and a transmission unit are sequentially arranged in the left cavity front and back, a storage battery and a control unit are sequentially arranged in the right cavity front and back, and a printing component is arranged between the left cavity and the right cavity; the scroll is used for sleeving recording paper, and the recording paper sequentially passes through the printing component and the push-type knife mechanism and is output from the output port of the shell.

Further, in a preferred embodiment of the present invention, the printing assembly includes a print head and a glue roller, the recording paper passes between the print head and the glue roller, and the transmission unit drives the glue roller to rotate.

Further, in a preferred embodiment of the present invention, the housing includes an outer housing and an inner housing embedded in the outer housing, between which the transmission unit and the control unit are disposed; the inner shell is provided with a paper bin and a chamber for accommodating the storage battery, wherein the paper bin is arranged on one side of the inner shell, facing the cover.

Further, in a preferred embodiment of the present invention, the push cutter mechanism includes an operating member extending out of the housing of the printer and a cutter assembly moving between a cutting position and an initial position, the operating member driving the cutter assembly to move toward the cutting position.

Further, in a preferred embodiment of the present invention, the cutter assembly includes a restriction member, a cutter seat, and a cutter, the operation member is connected to the cutter seat, the restriction member is provided on the cutter seat, the cutter is fixed on the cutter seat, the restriction member prevents the recording paper from moving, and the cutter continues to move and cut the recording paper.

Further, in a preferred embodiment of the present invention, a reset assembly is provided between the cutter assembly and the housing of the printer.

Further, in a preferred embodiment of the present invention, the cutter holder is provided with a through slot, the cutter holder includes a main body portion and a blocking portion, the blocking portion and the main body portion are respectively located at two sides of the through slot, and the recording paper passes through the through slot.

Further, in a preferred embodiment of the present invention, the reset assembly includes a first elastic member and a second elastic member; the limiting piece comprises a first shaft part and a second shaft part, the axes of the first shaft part and the second shaft part are along the movement direction of the limiting piece, the first elastic piece is sleeved on the first shaft part, and the second elastic piece is sleeved on the second shaft part.

Further, in a preferred embodiment of the present invention, the printer further includes a sensing member, a lever, and a switching member, the print head is provided on the lever, and the switching member is connected to the lever; the cover is provided with a trigger part, and when the cover is covered in place on the shell, the trigger part drives the switching piece to move, so that the printing head is positioned at a printing position and the sensing piece is triggered to work.

Further, in a preferred embodiment of the present invention, the triggering portion is a bump provided on the cover, the sensing member and the switching member are respectively located at two sides of the triggering portion, and an insertion space is reserved between the sensing member and the switching member for inserting the triggering portion.

The beneficial effects of the invention are as follows: the printer obtained through the design divides the containing cavity into the upper cavity and the lower cavity, and further divides the lower cavity into the left cavity and the right cavity. Each mechanism and each unit are reasonably arranged, the space of the containing cavity is effectively utilized, the printer is further miniaturized and light, and the printer can be conveniently held in the hand for use. Meanwhile, the push-type knife mechanism with convenient operation and good structural stability is designed, so that the recording paper is convenient to cut and is flat.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a printer according to an embodiment of the present invention at a first viewing angle;

FIG. 2 is a schematic illustration of the printer of FIG. 1 with a cover removed;

FIG. 3 is a schematic view of the printer with the cover and the inner housing removed and the push mechanism and the support bar in an initial position;

FIG. 4 is a schematic view of the printer with the cover and the inner housing removed, and the push mechanism in the cutting position and the strut in the printing position;

FIG. 5 is a schematic view of the structure of the push mechanism of the printer of FIG. 2 at a first view;

FIG. 6 is a schematic diagram of a second view of the push mechanism of the printer of FIG. 2;

FIG. 7 is a schematic view of a third view of the push mechanism of the printer of FIG. 2;

FIG. 8 is a schematic view of a switch in the printer of FIG. 2;

icon: 1-a housing; 11-a housing; 12-an inner shell; 13-a conveying channel; 14-a reel; 121-a paper bin; 2-a cover; 21-a visual window; 3-paper roll; 31-recording paper; 4-a power supply; 5-switching piece; 6-a push-broach mechanism; 61-an operating member; 611-friction lines; 62-a limiter; 621-a first shaft portion; 622-second shaft portion; 623-a pressing portion; 624-a first clamping portion; 625-friction part; 63-a knife holder; 631-button holes; 632-vias; 633-barrier; 633A-horizontal edge; 633B-vertical edge; 633 A1-second side; 633 A2-first side; 634-second clamping part; 64-a first elastic member; 65-a second elastic member; 66-cutting knife; 7-a transmission unit; 71-an electric motor; 72-gear set; 8-a printing assembly; 81-rubber roller; 82-a printhead; 9-supporting rods; 10-sensing piece.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 8, the printer includes a housing 1 and a cover 2 cooperating with the housing 1, wherein a cavity is provided in the housing 1, and a push-knife mechanism 6, a printing assembly 8, a transmission unit 7, a control unit, a power supply 4 and other structures are provided in the cavity. Preferably, the casing 1 adopts a cuboid structure, the cover 2 is provided with a visual window 21, and the visual window 21 is arranged at the position of the paper bin 121, so that the application condition of the recording paper 31 can be observed conveniently. The whole appearance is similar to a magnetic tape, is small and exquisite, is convenient to hold in hands and is convenient to use. It will be appreciated that the housing 1 may be of a shape configuration in a number of situations, such as square, circular, rectangular, etc.

In the embodiment, the cover 2 is detachably arranged on the housing 1, and the cover and the housing are matched through a plurality of pairs of fastening structures, wherein the fastening structures comprise mutually matched clamping grooves and clamping hooks. Wherein, be equipped with draw-in groove or trip on the lid 2, be equipped with draw-in groove or trip on the casing 1, lid 2 and casing 1 lock are convenient for open lid 2 change scroll 3, change power 4 or maintenance etc. of recording paper 31. Preferably, the buckle structure is arranged at the edge positions of the shell 1 and the cover 2, the cover 2 is provided with a clamping groove and a clamping hook, the shell 1 is correspondingly provided with the clamping hook and the clamping groove which are matched with the clamping groove, the clamping hook and the clamping groove are arranged in a crossed mode, and the clamping hook and the clamping groove can be stably connected and are convenient to disassemble and assemble.

In the embodiment, the holding cavity is divided into an upper cavity and a lower cavity, the upper cavity is provided with a push-broach mechanism 6, the lower cavity is divided into a left cavity and a right cavity, a reel 14 and a transmission unit 7 are sequentially arranged in the left cavity front and back, a storage battery and a control unit are sequentially arranged in the right cavity front and back, and a printing assembly 8 is arranged between the left cavity and the right cavity. Each mechanism and each unit in the embodiment are reasonably arranged, the space of the containing cavity is effectively utilized, further miniaturization and light weight of the printer are realized, and the printer can be conveniently held in hands for use.

In the embodiment, the case 1 is preferably a rectangular parallelepiped, and the front and rear surfaces thereof have the largest area, and the cover 2 is covered on the front side of the case 1. The shell 1 comprises an outer shell 11 and an inner shell 12 embedded in the outer shell 11, and a transmission unit 7 and a control unit are arranged between the outer shell 11 and the inner shell, so that the transmission unit 7 and the control unit are isolated from the outside relatively, the interference of the outside to the transmission unit 7 and the control unit is reduced, and more stable operation of the transmission unit 7 is facilitated.

In the embodiment, the inner shell 12 is provided with a paper bin 121 and a chamber for accommodating a storage battery, and the paper roll 3 of the recording paper 31 and the storage battery are arranged on one side close to the cover 2, so that the paper roll 3 can be conveniently opened and the storage battery can be conveniently replaced. The housing 11 is provided with a reel 14, the reel 14 extends into the paper bin 121 to sleeve the paper roll 3, and the recording paper 31 sequentially passes through the printing component 8 and the push knife mechanism 6 and is output from the output port of the housing 1.

In the embodiment, the printing assembly 8 includes the glue roller 81 and the print head 82, and the recording paper 31 passes between the print head 82 and the glue roller 81. The driving unit 7 drives the rubber roller 81 to rotate, and the rubber roller 81 rotates to drive the recording paper 31 to move by friction force. The printing head 82 presses the recording paper 31 against the glue roller 81, and the printing head 82 generates heat and leaves a print mark on the recording paper 31.

In the embodiment, the transmission unit 7 comprises a motor 71 and a gear set 72, the motor 71 is connected with the control unit, the motor 71 drives the rubber roller 81 to rotate through the gear set 72, and the gear set 72 comprises a plurality of gears which are sequentially meshed for transmission. It will be appreciated that the gear set 72 may be replaced with other types of drive arrangements such as worm gears and the like.

In the embodiment, when the cover 2 is opened, the print head 82 is located at the initial position, and is in a state of being separated from the glue roller 81; when the cover 2 is buckled with the shell 1, the printing head 82 is positioned at the printing position, and the printing head 82 is pressed against the rubber roller 81. When the cover is opened, the printing head 82 is separated from the rubber roller 81, so that the equipment parts are repaired for a long time, misoperation is avoided, and the service life of the equipment is prolonged.

Specifically, the printer further comprises a sensing member 10, a supporting rod 9 and a switching member 5, the printing head 82 is arranged on the supporting rod 9, and the switching member 5 is connected with the supporting rod 9. The cover 2 is provided with a trigger part which drives the switching member 5 to move when the cover 2 is covered in place on the housing 1, so that the printing head 82 is positioned at the printing position. The trigger part of the cover 2 drives the switching piece 5 to move, so that the supporting rod 9 is driven to move, the printing head 82 can move from the initial position to the printing position, and the device has a simple structure and accurate state switching. Can separate the two when uncapping; the print head 82 is placed in a position to engage the glue roller 81 at the time of printing.

In the embodiment, when the cover 2 is covered, the triggering part triggers the sensing piece 10 to work at the same time, and the sensing piece 10 and the control unit send signals to the control unit by the sensing piece 10. The sensing piece 10 adopts a switch, an inductor and the like, preferably, the sensing piece 10 adopts a reset switch, and when the trigger part is separated from contact with the reset switch, the reset switch is automatically reset to be in an off state.

In the embodiment, the middle part of the supporting rod 9 is hinged with the shell 1, the printing head 82 is arranged at one end of the supporting rod 9, and the other end of the supporting rod 9 is connected with the switching piece 5. The switching member 5 is hinged with the housing 1, and the switching member 5 includes a connection portion and a contact portion for contacting the trigger portion. The contact part is fan-shaped and is provided with an inclined plane contacted with the trigger part. The connecting part is connected with the supporting rod 9 through a connecting piece, the connecting piece is an elastic piece, and when the cover 2 is opened, the switching piece 5 is reset by means of the connecting piece. Through the cooperation structure of design switchover piece 5 and trigger portion, can realize that switchover piece 5 drives branch 9 and prints the switching between the position in initial position, and then realize the two kinds of state switches of printing head 82. Wherein, the connecting piece also need not be the elastic component, when the connecting piece adopts inelastic piece, can realize the reset through setting up torsional spring etc. on switching piece 5.

In an embodiment, the triggering portion is a bump provided on the cover 2. The sensing piece 10 and the switching piece 5 are respectively positioned at two sides of the triggering part, and an insertion space is reserved between the sensing piece 10 and the switching piece 5 for inserting the triggering part. The cover 2 and the shell 1 are buckled, and meanwhile, the sensing piece 10 can be triggered at the same time, and the switching piece 5 is pushed to move.

In an embodiment, the switching process of the print head 82 is: the cover 2 is buckled on the shell 1, the triggering part stretches into the gap between the switching part 5 and the sensing part 10, and one side of the triggering part pushes the sensing part 10 to be in an open state and sends a signal to the control unit; the other side of the trigger pushes the switch 5 to rotate and in turn pulls the link which generates a force pulling the strut 9 to rotate, causing the printhead 82 to rest against the glue roller 81 from the initial position. When the cover 2 is opened, the trigger portion is pulled out from the housing 1, and the sensing member 10 is reset to the switching member 5.

In an embodiment in which the push cutter mechanism 6 is used to cut the recording paper 31 in the printer, the push cutter mechanism 6 includes an operating member 61 and a cutter assembly, the operating member 61 extends out of the housing 1 of the printer, the cutter assembly (cutter) moves between a cutting position and an initial position, and the operating member 61 drives the cutter assembly (cutter) to move toward the cutting position. The shell 1 is provided with a conveying channel 13, and the push-broach mechanism 6 is arranged at the inlet of the conveying channel 13.

In an embodiment, the cutter assembly includes a restricting member 62, a cutter holder 63, and a cutter 66, the operating member 61 is connected to the cutter holder 63, the restricting member 62 is disposed on the cutter holder 63, the cutter 66 is fixed on the cutter holder 63, the restricting member 62 prevents the recording paper 31 from moving, and the cutter 66 continues to move and cuts the recording paper 31. Through the cooperation motion of restriction piece 62 and blade holder 63, when cutting, at first through restriction piece 62 fixed recording paper 31, can guarantee the stability of recording paper 31 when cutting, guarantee that the cutting position is accurate, the incision is leveled.

In the embodiment, the operating member 61 is manually pushed to move along the chute of the housing 1, and the cutter assembly is driven to move toward the recording paper 31. The operating member 61 is operated in a sliding manner, which has the advantage of convenient operation. Preferably, the operating member 61 is a push button, a pushing surface matched with the finger is provided, and the pushing surface is provided with friction lines 611, so that the friction force between the operating member 61 and the finger is increased. The operation piece 61 is provided with a fixed buckle, the tool apron 63 is provided with a buckle hole 631 matched with the fixed buckle, and the device has the advantages of simple structure, small distance between the operation piece 61 and the tool apron 63, thrust control, convenient control and labor saving.

In the embodiment, the front end of the restriction member 62 is provided with a pressing portion 623 for pressing the recording paper 31 against the side wall of the casing 1, specifically against the side wall of the conveying path 13. Preferably, the pressing portion 623 has an arc-shaped structure, and the pressing portion 623 is prevented from scratching the recording paper 31.

In the embodiment, the limiting member 62 includes a first shaft portion 621 and a second shaft portion 622, the axes of the first shaft portion 621 and the second shaft portion 622 are along the movement direction of the limiting member 62, the tool holder 63 is provided with a through hole 632, the second shaft portion 622 is disposed in the through hole 632 in a penetrating manner, the limiting member 62 slides on the tool holder 63 through the second shaft portion 622, and the limiting member 62 or the tool holder 63 is provided with a friction portion 625 on the contact surface of the two. The second shaft portion 622 plays a guiding role, so that the limiting piece slides on the tool apron 63, and the accurate completion of the cutting action is ensured due to stable movement relationship.

In an embodiment, a reset assembly is provided between the cutter assembly and the housing 1 of the printer. The reset assembly comprises a first elastic piece 64 and a second elastic piece 65, wherein the first elastic piece 64 is connected with the shell 1 and the limiting piece 62, and the second elastic piece 65 is connected with the limiting piece 62 and the tool apron 63. The limiting piece 62 and the tool holder 63 are reset to the initial position of the limiting piece 62 through the first elastic piece 64, and the tool holder 63 is reset through the second elastic piece 65 moving relative to the limiting piece 62. Preferably, the first elastic member 64 is sleeved on the first shaft portion 621, and the second elastic member 65 is sleeved on the second shaft portion 622.

In the embodiment, the limiting member 62 is provided with a first clamping portion 624, the tool holder 63 is provided with a second clamping portion 634 matching with the first clamping portion 624, and the first clamping portion 624 is clamped or separated from the second clamping portion 634. The first clamping portion 624 and the second clamping portion 634 define a movement distance and an initial position of the limiting member 62 relative to the tool holder 63, so that the limiting member is stopped at a reasonable position of the tool holder 63 at the initial position.

In the embodiment, the tool holder 63 is provided with a through groove, the tool holder 63 includes a main body portion and a blocking portion 633, and the blocking portion 633 and the main body portion are respectively located at two sides of the through groove. The recording paper 31 passes through the through-slot, and the spacer 633 cooperates with the conveyance path 13 and blocks a gap therebetween in the cutting direction. The cutter component moves in the cutting direction, the cutter seat 63 moves from the cutting position to the initial position, the baffle part 633 pushes the recording paper 31 into the through groove and is tightly matched with the side wall of the conveying channel 13, so that the recording paper 31 enters the conveying channel 13, the deviation of the recording paper 31 to the side gap between the conveying channel 13 and the cutter seat 63 is avoided, and the problems that paper jam is easy to cause and normal operation cannot be achieved are solved.

In the embodiment, the blocking portion 633 includes a horizontal edge 633A and a vertical edge 633B bent opposite to the horizontal edge 633A, the horizontal edge 633A includes a first surface 633A2 and a second surface 633A1, the first surface 633A2 faces the cutter 66, and the second surface 633A1 is matched with the conveying path 13. By matching the surface with the line or the surface, the matching is tighter, and a gap is avoided between the surface and the line or the surface. And the first surface 633A2 and the conveying path 13 are smoothly transited, for example, the inner sidewall of the conveying path 13 is inclined, the first surface 633A2 is inclined with the same slope.

In the embodiment, the side of the cutter 66 facing the recording paper 31 is an inclined cut, so that the cutter 66 contacts the recording paper 31 as much as possible, and the cutting is more powerful and rapid.

In the embodiment, the working process of the push broach mechanism 6 is as follows: the operating member 61 is pushed to drive the cutter holder 63 and the cutter 66 to move, and the restricting member 62 is also moved toward the recording paper 31 by the second elastic member 65. The restriction member 62 then contacts and fixes the recording paper 31, and the blade holder 63 continues to move by the continued action of the operation member 61 until the cutting is completed. The operation member 61 is released, the restriction member 62 and the cutter holder 63 are reset by the first elastic member 64 and the second elastic member 65, and the recording paper 31 is pushed back in the forward direction during the reset, so that the recording paper 31 can be smoothly continuously output to the conveying path 13.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The palm printer comprises a shell and a cover, wherein the cover is detachably arranged on the shell, and a containing cavity is arranged in the shell; the scroll is used for sleeving recording paper, and the recording paper sequentially passes through the printing component and the push-type knife mechanism and is output from the output port of the shell; wherein,

the shell is limited with a conveying channel for the recording paper to pass through, the push-broach mechanism comprises a tool apron limited with a through groove, and the tool apron also comprises a baffle part and a main body part which are respectively and fixedly arranged at two sides of the through groove along the cutting direction; the through groove is at least partially positioned in the conveying channel and used for the recording paper to pass through, and the blocking part is matched with the conveying channel and blocks the gap between the conveying channel and the cutter holder in the cutting direction; the separation part comprises a horizontal edge and a vertical edge bent relative to the horizontal edge, the horizontal edge comprises a first surface and a second surface, the first surface faces the cutter, and the second surface is matched with the conveying channel; the method comprises the steps of,

the push broach mechanism also comprises an operation piece, a limiting piece and a cutter; the operating piece extends out of the shell of the printer, the cutter moves between a cutting position and an initial position, and the operating piece drives the cutter to move towards the cutting position; the operation piece is connected with the cutter holder, the limiting piece is arranged on the cutter holder, the cutter is fixed on the cutter holder, the limiting piece prevents the recording paper from moving, and the cutter continues to move and cuts the recording paper.

2. The palm printer of claim 1, wherein the printing assembly includes a print head and a glue roller, the recording paper passing between the print head and the glue roller, the drive unit driving the glue roller to rotate.

3. The palm printer of claim 1, wherein the housing comprises an outer shell and an inner shell embedded in the outer shell, the transmission unit and the control unit being arranged therebetween; the inner shell is provided with a paper bin and a chamber for accommodating the storage battery, wherein the paper bin is arranged on one side of the inner shell, facing the cover.

4. The palm printer of claim 1, wherein a reset assembly is disposed between the cutter assembly and the printer housing.

5. The palm printer of claim 4, wherein the reset assembly comprises a first resilient member and a second resilient member; the limiting piece comprises a first shaft part and a second shaft part, the axes of the first shaft part and the second shaft part are along the movement direction of the limiting piece, the first elastic piece is sleeved on the first shaft part, and the second elastic piece is sleeved on the second shaft part.

6. The palm printer of claim 2, further comprising a sensing member, a lever, and a switching member, the printhead being disposed on the lever, the switching member being coupled to the lever; the cover is provided with a trigger part, and when the cover is covered in place on the shell, the trigger part drives the switching piece to move, so that the printing head is positioned at a printing position and the sensing piece is triggered to work.

7. The palm printer of claim 6, wherein the trigger part is a bump provided on the cover, the sensing part and the switching part are respectively located at two sides of the trigger part, and an insertion space is left between the sensing part and the switching part for inserting the trigger part.