Cutter assembly and printer comprising same

Abstract

The cutter assembly comprises a paper pressing piece and a push block structure which are movably arranged on a machine body, the paper pressing piece is rotatably connected with a cutter, an elastic connecting piece is connected between the cutter and the push block structure, and the elastic connecting piece is connected with the paper pressing piece. The push block structure is used for pushing the paper pressing piece to move through the elastic connecting piece so as to press paper and used for driving the cutter to rotate through the elastic connecting piece so as to cut the paper. The scheme of the application has the advantage that the blade is not exposed, so that the damage to a human body is avoided.

Description

Technical Field

[0001] This application relates to the technical field of printers, and specifically, to an internal cutting knife assembly and a printer containing the same. Background Art

[0002] A thermal printer is a small and portable printing device. The printing roll paper is built into the printer, and the printed paper is generally cut and separated by a metal paper cutter provided on the printer. However, this metal paper cutter generally has a sharp serrated structure and generally protrudes from the outer surface of the printer for effective cutting, with its sharp side facing outward, so there is a risk of hurting people. For example, a thermal printer with integrated interfaces disclosed in the patent document with the application number CN202020729292.3, the paper cutting device adopted in this patent document is arranged on the front side wall outside the housing, and there will be the above risks. Summary of the Utility Model

[0003] In view of the above deficiencies of the prior art, this application provides an internal cutting knife assembly in which the blade will not be exposed, so it will not cause harm to the human body.

[0004] To solve the above technical problems, the technical solution adopted in this application is as follows: A cutting knife assembly includes a paper pressing member and a push block structure that are movably arranged on the machine body. A cutting knife is rotatably connected to the paper pressing member. An elastic connecting member is connected between the cutting knife and the push block structure. The push block structure is used to push the paper pressing member to move through the elastic connecting member to press the paper, and is used to drive the cutting knife to rotate through the elastic connecting member to cut the paper.

[0005] With the above structure, this application places the cutting knife assembly inside the housing of the printer. The cutting knife rotates under the driving force of the elastic connecting member, so as to perform rotary cutting on the paper coming out of the paper outlet, which can cut the paper more thoroughly. Moreover, the cutting knife is built-in and not exposed, so it avoids possible harm to the human body. In addition, the cutting knife of this application is driven to rotate and cut through the elastic connecting member, so the cutting force is large and the cutting is more neat. In addition, while driving the cutting knife to rotate, the elastic connecting member can also drive the paper pressing member to press the paper in the paper outlet at the same time, so that the cutting knife can cut the paper more stably.

[0006] Furthermore, the elastic connecting member includes an elastic push rod and an elastic reset member. The elastic reset member is sleeved on the elastic push rod, and the elastic reset member is used to drive the push block structure away from the cutting knife so that the elastic push rod drives the cutting knife to reset. With the above structure, during the paper cutting process, when the push block structure is pushed, the elastic reset member is compressed. After removing the force on the push block structure, the cutting knife can be driven to reset by the elastic reset member. When cutting next time, it is only necessary to push the push block structure again, which is simple and convenient to operate.

[0007] Furthermore, the paper pressing member includes a longitudinally extending wall. The cutting knife is rotatably installed on the longitudinally extending wall through a rotating shaft. An arc-shaped guide groove coaxial with the rotating shaft is penetrated on the longitudinally extending wall, and the length direction of the arc-shaped guide groove is consistent with the movement direction of the push block structure. The end of the elastic push rod is inserted into the arc-shaped guide groove and can slide along the extension track of the arc-shaped guide groove. With this structure, during the process of the push block structure pushing the elastic push rod to operate, the elastic push rod can slide along the arc-shaped guide groove, and the cutting knife and the paper pressing member are rotatably connected. At this time, the cutting knife can rotate along the rotation point under the combined action of the elastic push rod and the arc-shaped guide groove to realize the rotary cutting action of the paper, so as to effectively cut the paper.

[0008] Furthermore, a soft rubber block is connected to the side wall of the paper pressing member facing the paper. With this structure, soft contact can be realized between the paper pressing member and the paper. On the one hand, it can avoid damaging the paper. On the other hand, this soft contact can make the friction between the paper and the soft rubber block large, avoiding the displacement of the paper during the cutting process and affecting the cutting effect.

[0009] Furthermore, an outlet opening is provided on the side wall of the paper pressing member facing the paper. The cutting knife is used to extend out from the outlet opening. An installation groove is provided at the bottom of the paper pressing member, and the lower side of the cutting knife is used to be accommodated in the installation groove. With this structure, before cutting the paper, the blade of the cutting knife can be encapsulated in the outlet opening to improve safety. More importantly, it can maintain the effective cooperation between the cutting knife and the paper pressing member, avoiding the cutting knife breaking away from the limitation of the outlet opening and affecting the reset. The setting of the installation groove can further stabilize the positioning of the cutting knife.

[0010] Furthermore, the push block structure includes a push block connecting member and a push block connected to the push block connecting member. The push block is used to push the push block connecting member close to the cutting knife. Through the above structure, the push block can be used to drive the push block connecting member, thereby indirectly pushing the cutting knife to complete the paper cutting action.

[0011] Further, a sleeve post and a positioning block are arranged on the inner side wall of the push block connecting piece. A through hole is arranged on the positioning block. The elastic push rod passes through the through hole and one end of the elastic push rod is sleeved on the sleeve post. With this structure, the connection between the elastic push rod and the push block connecting piece can be realized. Moreover, by passing through the through hole on the positioning block, the position of the elastic push rod is more stable, avoiding large deformation during operation and causing difficulty in resetting.

[0012] Further, the present application also provides a printer, which includes the cutter assembly described above in the present application. The structure of the printer further includes a housing. The paper pressing piece, the cutter, the elastic push rod and the push block connecting piece of the cutter assembly are all arranged in the housing. One end of the push block of the cutter assembly is externally arranged on the outer wall of the housing and can slide relative to the housing. The printer adopting the above cutter assembly can realize the rotary driving of the cutter to cut the paper, making the paper cutting more accurate and thorough. Moreover, the cutter of the printer is built-in, reducing the risk of harm to the operator. And the built-in cutter avoids harm to the operator. The operation of the cutter can be realized through one end of the externally arranged push block, which is more convenient.

[0013] Further, a lapping groove is arranged on the inner wall of the housing of the printer. The elastic push rod is accommodated in the lapping groove. One end of the elastic resetting piece of the cutter assembly abuts against the positioning block on the push block connecting piece, and the other end abuts against the end surface where the lapping groove is located. With this structure, the position of the elastic push rod can be further stabilized, making its resetting and driving the cutter to rotate more accurate. And the elastic resetting piece can be compressed by the positioning block towards the lapping groove direction during the process of driving the cutter. When the pushing force on the push block is removed, the elastic resetting piece stretches between the lapping groove and the positioning block to drive the push block connecting piece to return to the initial position. Description of the Drawings

[0014] Figure 1 Structure schematic diagram of the first view of the cutter assembly of the present application.

[0015] Figure 2 Structure schematic diagram of the second view of the cutter assembly of the present application.

[0016] Figure 3 Structure schematic diagram of the first view of the cutter assembly of the present application with the push block hidden.

[0017] Figure 4 Structure schematic diagram of the second view of the cutter assembly of the present application with the push block hidden.

[0018] Figure 5 Structure schematic diagram of the third view of the cutter assembly of the present application with the push block hidden.

[0019] Figure 6Schematic structural diagram of the cutter assembly of the present application with the cutter hidden.

[0020] Figure 7 Schematic structural diagram of the first view of the exploded view of the cutter assembly of the present application.

[0021] Figure 8 Schematic structural diagram of the second view of the exploded view of the cutter assembly of the present application.

[0022] Figure 9 Schematic structural diagram visible inside the housing of the printer of the present application.

[0023] Figure 10 Schematic structural diagram of the first view in which the cutter assembly is visible inside the housing of the printer of the present application.

[0024] Figure 11 Schematic structural diagram of the second view in which the cutter assembly is visible inside the housing of the printer of the present application.

[0025] Figure 12 Schematic structural diagram of the printer of the present application.

[0026] As shown in the accompanying drawings: 1. Paper pressing member, 101. Longitudinal extension wall, 102. Rotating shaft, 103. Arc-shaped guide groove, 104. Outlet, 105. Installation groove, 106. Transverse extension wall, 2. Cutter, 3. Elastic push rod, 4. Elastic reset member, 5. Soft rubber block, 6. Push block connecting member, 601. Clamping block, 602. Sleeve column, 603. Positioning block, 604. Through hole, 7. Push block, 701. Clamping buckle, 8. Housing, 801. First retaining wall, 802. Second retaining wall, 803. Guide groove, 804. Lapping groove. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the embodiments and the accompanying drawings. Obviously, the described embodiments are only preferred embodiments, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention;

[0028] In addition, it should be noted that: when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be another intermediate component through which it is fixed. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] As shown in the Figures 1-8 accompanying drawings, a built-in cutter assembly of the present application is provided, and its structure includes a paper pressing member 1 and a push block structure that are movably disposed on the machine body. A cutter 2 is rotatably connected to the paper pressing member 1. An elastic connecting member is connected between the cutter 2 and the push block structure. The push block structure is used to push the paper pressing member 1 to move through the elastic connecting member to press the paper, so that the paper pressing member presses the paper to facilitate the cutter to cut, and is used to drive the cutter 2 to rotate through the elastic connecting member to cut the paper; the above-mentioned machine body can be the machine body of a printer or the housing of a printer.

[0030] With the above structure, the cutter assembly of the present application is built into the interior of the housing of the printer. The cutter rotates under the driving force of the elastic connecting member, so as to perform rotary cutting on the paper coming out of the paper outlet, and can achieve more thorough cutting of the paper. Moreover, the cutter is built-in and not exposed, thus avoiding possible harm to the human body. In addition, the cutter of the present application is driven to rotate and cut through the elastic connecting member, so the cutting force is large and the cutting is more neat. In addition, while driving the cutter to rotate, since the cutter is also connected to the paper pressing member, the elastic connecting member can also drive the paper pressing member to press the paper in the paper outlet at the same time, so that the cutter can cut the paper more stably.

[0031] As shown in the Figures 1-8As shown in the figure, the elastic connecting member described in the present application includes an elastic push rod 3 and an elastic reset member 4. The elastic reset member 4 is sleeved on the elastic push rod 3, and the elastic reset member 4 is used to drive the push block structure away from the cutter 2 so that the elastic push rod 3 drives the cutter 3 to reset. Specifically, one end of the elastic push rod is connected to the cutter, and the other end is connected to the push block structure. Under the push of the push block structure, the elastic push rod pushes the cutter to cut the paper. When a force is applied to the push block structure to drive the cutter to cut the paper, the elastic reset member is compressed. After the force applied to the push block structure is removed, the elastic reset member extends and resets to drive the cutter to retract and reset. The above reset means that the cutter returns to the initial position where it does not cut the paper.

[0032] As shown in the attached Figure 2 、 5 -8, the paper pressing member 1 described in the present application includes a longitudinally extending wall 101, that is, it extends along the extension direction of the cutter surface, or in other words, along the length extension direction of the elastic push rod. The cutter 2 is rotatably installed on the longitudinally extending wall 101 through a rotating shaft 102. The above rotating shaft is vertically arranged on the longitudinally extending wall. The end face of the rotating shaft can be fastened by screws to firmly connect the cutter and the rotating shaft to prevent it from detaching from the rotating shaft. An arc-shaped guide groove 103 coaxial with the rotating shaft 102 is penetrated on the longitudinally extending wall 101, that is, the arc-shaped guide groove is concentric with the rotating shaft, and the length direction of the arc-shaped guide groove 103 is consistent with the movement direction of the push block structure. The end of the elastic push rod 3 is inserted into the arc-shaped guide groove 103 and can slide along the extension track of the arc-shaped guide groove 103. Specifically, the arc-shaped guide groove is located above the rotating shaft. The arc-shaped guide groove is a circular arc structure concentric with the rotating shaft. The angle by which the elastic push rod drives the cutter to rotate around the rotating shaft is the angle of the extension track of the arc-shaped guide groove. One end of the elastic push rod close to the cutter is bent at 90 degrees, then inserted into a jack arranged on the cutter, and then passes through the jack and enters the arc-shaped guide groove, so as to slide in the arc-shaped guide groove. With this structure, during the process of the push block structure pushing the elastic push rod to move, the elastic push rod can slide along the arc-shaped guide groove, and the cutter is rotatably connected to the paper pressing member. At this time, it can rotate along the rotating shaft under the joint action of the elastic push rod and the arc-shaped guide groove, realizing the rotary cutting action of the paper, so as to effectively cut the paper.

[0033] As shown in the attached Figure 5 、 10As shown in the figure, a soft rubber block 5 is connected to the side wall of the paper pressing member 1 of the present application facing the paper. Specifically, a paper outlet is provided on the printer, and the paper to be printed is led out of the printer through this outlet to the outside of the printer. During the cutting process of the cutter, the soft rubber block presses the paper extended on both sides of the cutter thickness. The soft rubber block 5 and the paper pressing member 1 are adhesively fixed to each other, or a groove is opened on the corresponding outer wall of the paper pressing member, and a part of the soft rubber block is inserted into the groove to achieve connection. With this structure, soft contact can be achieved between the paper pressing member and the paper. On the one hand, it can avoid damaging the paper, and on the other hand, this soft contact can increase the friction between the paper and the soft rubber block, preventing the paper from shifting during the cutting process and affecting the cutting effect.

[0034] As shown in the attached Figures 1-8 figure, on the side wall of the paper pressing member 1 of the present application facing the paper, a cutting opening 104 is provided. The cutter 2 is used to extend out from the cutting opening 104 to contact the paper for cutting. An installation groove 105 is provided at the bottom of the paper pressing member 1, and the lower side of the cutter 2 is used to be accommodated in the installation groove 105. Specifically, the cutting opening is used for accommodating the cutter blade. When not cutting, the blade is hidden in the cutting opening, and when cutting, under the action of the driving force, the cutter rotates and its blade rotates out of the cutting opening to cut the paper. The installation groove is used for the bottom surface of the cutter to slide and assemble inside, improving the stability of the cutter during operation. The bottom surface of the cutter can be an arc-shaped surface to facilitate smoother rotation and reset, avoiding jamming. With this structure, before cutting the paper, the blade of the cutter can be encapsulated in the cutting opening, improving safety. More importantly, it can maintain the effective cooperation between the cutter and the paper pressing member, preventing the cutter from being restricted by the cutting opening and affecting the reset. The setting of the installation groove can further stabilize the positioning of the cutter.

[0035] As shown in the attached Figures 1-2 , Figures 7 - 8 show that the push block structure of the present application includes a push block connecting member 6 and a push block 7 connected to the push block connecting member 6. The push block 7 is used to push the push block connecting member 6 close to the cutter 2. Specifically, a clamping block 601 is provided on the push block connecting member 6, and a clamping buckle 701 is provided on the push block 7. The clamping buckle 701 is buckled and connected to the clamping block 601 to achieve the connection between the push block and the push block connecting member. More specifically, a clamping groove is opened at the center position of the body of the push block connecting member. A support plate that protrudes from the surface of the connecting member body horizontally in the middle of the clamping groove is the clamping block 601. And symmetrically arranged clamping buckles are provided on the push block, which extend towards the inside of the housing. The clamping buckles pass through the clamping groove and are abutted and buckled with the outer wall of the connecting member body. With this structure, the connection between the push block and the push block connecting member can be achieved, so as to drive the push block connecting member and the elastic push rod connected thereto by pushing the push block.

[0036] As shown in the attached Figure 5 、7 -8, a sleeve column 602 and a positioning block 603 are provided on the inner side wall of the push block connector 6 described in the present application, i.e., on the side close to the inside of the shell, a through hole 604 is provided on the positioning block 603, and the through hole 604 extends along the length direction of the elastic push rod 3, the elastic push rod 3 passes through the through hole 604 and one end of the elastic push rod 3 is sleeved on the sleeve column 602; specifically, the positioning block is located at the end of the push block connector close to the cutter, and the sleeve column is located at the end away from the cutter; a hook ring is provided at the corresponding end of the elastic push rod to realize a sleeve connection with the sleeve column, and a screw hole can be provided on the sleeve column, and a stable connection is achieved between the hook ring and the sleeve column by tightening the screws; adopting this structure, the connection between the elastic push rod and the push block connector can be realized, and the position of the elastic push rod is made more stable by passing through the through hole on the positioning block, thereby avoiding large deformation during operation and causing difficulty in resetting.

[0037] As attached Figures 9-10 As shown, the present application further provides a printer, the printer contains the cutter assembly described above in the present application, the printer also includes a shell 8, the paper pressing member 1, the cutter 2, the elastic push rod 3 and the push block connecting member 6 of the cutter assembly are all placed in the shell 8, one end of the push block 7 of the cutter assembly is externally placed on the outer wall of the shell 8 and can slide relative to the shell 8; that is, one end of the push block in the thickness direction is externally placed on the outer wall of the shell, and the other end in the thickness direction extends into the shell to connect with the push block connecting member. The printer using the above-mentioned cutter assembly can realize the rotary drive cutter to cut paper, so that the paper cutting is more accurate and thorough; and the cutter of the printer is built-in, which reduces the risk of injury to the operator; and the cutter is built-in to avoid injury to the operator. The operation of the cutter can be realized by placing one end of the push block, which is more convenient; specifically, the printer includes a fixed shell below and a rotating shell rotatably connected to the fixed shell, and the rotating shell rotates relative to the fixed shell to realize the covering and opening actions; the printing roll paper, head piece, cutter assembly and other structures of the present application are all arranged in the fixed shell and sealed by the middle shell; a long hole is arranged on the outer wall of the fixed shell of the printer of the present application, and the snap-on buckle of the push block passes through the long hole and realizes a snap-on connection with the push block connecting piece on the inner side, and the extension length of the long hole is greater than the extension length of the snap-on buckle so that the push block can slide back and forth to realize the driving and resetting actions of the cutter; the elastic resetting piece of the present application can adopt a straight spring, which is directly fitted on the elastic push rod; the elastic push rod of the present application can be an elastic metal rod body.

[0038] As attached Figures 9-10As shown, a first baffle wall 801 and a second baffle wall 802 are arranged on the inner wall of the shell 8 of the printer described in the present application, and the first baffle wall 801 and the second baffle wall 802 form a guide groove 803 for assembling the paper pressing member 2 with the shell 8, and the first baffle wall 801 and the second baffle wall 802 can both abut against the transverse extension wall 106 of the paper pressing member 1; specifically, the transverse extension wall is vertically connected to the longitudinal extension wall, and the extension direction of the transverse extension wall is consistent with the paper discharge direction, and the soft rubber block is arranged on the side of the transverse extension wall close to the paper; the transverse extension wall passes over the baffle wall and is closer to the paper discharge side, so that the paper pressing member abuts against the baffle wall during the withdrawal process; with this structure, the paper pressing member can be connected to the shell, and under the abutment of the first baffle wall and the second baffle wall, the paper pressing member can be prevented from being excessively withdrawn and causing difficulty in resetting.

[0039] As attached Figures 9-10 As shown, a lap groove 804 is provided on the inner wall of the shell 8 of the printer described in the present application, the elastic push rod 3 is supported in the lap groove 804, one end of the elastic reset member 4 abuts against the positioning block 603, and the other end abuts against the end surface where the lap groove 804 is located; adopting this structure, the position of the elastic push rod can be further stabilized, so that its reset and driving the cutter to rotate are more accurate; and the elastic reset member can be compressed by the positioning block toward the lap groove direction during the process of driving the cutter, and when the driving force on the push block is removed, the reset member extends between the lap groove and the positioning block to drive the push block connecting member to return to the initial position.

[0040] The printer with a built-in cutter assembly of the present application has the following specific working principles and processes: first, the soft rubber block and the paper pressing piece are fixedly bonded by adhesive, the cutter and the paper pressing piece are locked by screws through the shaft hole, and the cutter can rotate relative to the shaft; one end of the elastic push rod is connected to the push block connecting piece by a sleeve column, and the sleeve column can be provided with a shaft hole and locked by screws to prevent the elastic push rod from being separated from the push block connecting piece; the other end of the elastic push rod is matched with the cutter through a socket, and is inserted into the arc guide groove of the paper pressing piece through the socket; the cutter assembly is matched to the printer housing by the guide groove; the push block is snap-fitted with the card block on the push block connecting piece by a snap-fit ​​buckle, and the push block and the push block connecting piece are locked. A partial shell of the printer is clamped, and the pushing part of the push block is exposed outside the shell to facilitate the application of driving force. The push block can slide forward and backward along the shell to realize the driving and resetting of the cutter; when the push block is pushed toward the cutter side, the push block connecting member is also linked to move toward the cutter direction as a whole, and the paper pressing member and the soft rubber block thereon are also driven to press the paper tightly. The push block continues to push, and the elastic push rod overcomes its own elasticity and continues to move upward along the arc guide groove of the paper pressing member. While moving along the arc guide groove, the cutter rotates around the axis on the paper pressing member to cut the paper. During the above process, the elastic reset member is compressed; when resetting, the push block is released and is not subject to force. Under the action of the elastic reset force of the elastic reset member, the push block is driven to retreat, and the cutter is reset in a linked manner.

Claims

1. A cutter assembly, characterized in that: The invention comprises a paper pressing member (1) and a pushing block structure which are movably arranged on a machine body; a cutter (2) is rotatably connected to the paper pressing member (1); an elastic connecting member is connected between the cutter (2) and the pushing block structure; the pushing block structure is used to push the paper pressing member (1) to move through the elastic connecting member to press the paper, and is used to drive the cutter (2) to rotate through the elastic connecting member to cut the paper.

2. The cutter assembly according to claim 1, characterized in that: The elastic connecting member comprises an elastic push rod (3) and an elastic reset member (4), wherein the elastic reset member (4) is sleeved on the elastic push rod (3), and the elastic reset member (4) is used to drive the push block structure away from the cutter (2), so that the elastic push rod (3) drives the cutter (2) to reset.

3. The cutter assembly according to claim 2, characterized in that: The paper pressing member (1) comprises a longitudinal extension wall (101), the cutter (2) is rotatably mounted on the longitudinal extension wall (101) via a rotating shaft (102), an arc guide groove (103) coaxial with the rotating shaft (102) is provided through the longitudinal extension wall (101), and the length direction of the arc guide groove (103) is consistent with the movement direction of the push block structure; the end of the elastic push rod (3) is inserted into the arc guide groove (103) and can slide along the extension track of the arc guide groove (103).

4. The cutter assembly according to claim 1, characterized in that: A soft rubber block (5) is connected to a side wall of the paper pressing member (1) facing the paper.

5. The cutter assembly according to claim 1, characterized in that: A knife outlet (104) is provided on a side wall of the paper pressing member (1) facing the paper, and the cutter (2) is used to extend from the knife outlet (104); a mounting groove (105) is provided at the bottom of the paper pressing member (1), and a lower side of the cutter (2) is used to be accommodated in the mounting groove (105).

6. The cutter assembly according to claim 1, characterized in that: The push block structure comprises a push block connecting member (6) and a push block (7) connected to the push block connecting member (6), and the push block (7) is used to push the push block connecting member (6) close to the cutter (2).

7. The cutter assembly according to claim 6, characterized in that: A sleeve column (602) and a positioning block (603) are arranged on the inner wall of the push block connecting member (6), a through hole (604) is arranged on the positioning block (603), the elastic push rod (3) passes through the through hole (604) and one end of the elastic push rod (3) is sleeved on the sleeve column (602).

8. A printer, characterized in that: The printer comprises a cutter assembly as claimed in any one of claims 1 to 7, and further comprises a housing (8), wherein the paper pressing member (1), the cutter (2), the elastic push rod (3) and the push block connecting member (6) of the cutter assembly are all arranged in the housing (8), and one end of the push block (7) of the cutter assembly is arranged on the outer wall of the housing (8) and can slide relative to the housing (8).

9. The printer according to claim 8, characterized in that: A lap groove (804) is provided on the inner wall of the printer housing (8), the elastic push rod (3) is accommodated in the lap groove (804), one end of the elastic reset member (4) of the cutter assembly abuts against the positioning block (603) on the push block connecting member (6), and the other end abuts against the end surface where the lap groove (804) is located.

Images