Paper cutting mechanism and printer core having the same

Abstract

A paper cutting mechanism, characterized in that it includes a frame, a motor, a driving pulley, a driven pulley, a transmission gear set, an annular belt, a knife holder, a fixed knife and a moving knife assembly, wherein the motor is arranged on one side of the frame and has a driving gear; the transmission gear set is arranged on the frame and can transmit the power of the motor to the driving pulley; the knife holder is connected to the annular belt and can move back and forth relative to the frame with the annular belt; the fixed knife is arranged on the frame and parallel to the length direction of the annular belt; the moving knife assembly is arranged on the knife holder and can cooperate with the fixed knife to complete paper cutting during the movement. The present invention also discloses a printing mechanism. The circular blade rolls back and forth and cooperates with the fixed knife to complete paper cutting, the paper cutting is stable and reliable, the moving knife is easy to manufacture and produce, and the cost is low.

Description

Technical Field

[0001] The invention relates to a paper cutting device of a printing device, and also relates to a printing device. Background Art

[0002] Roll paper is commonly used in printers. After printing, the printer will automatically cut the paper, and the paper cutting work is completed by the printer's paper cutting mechanism. Currently, there are two common paper cutting methods:

[0003] The first type is the scissors type. Its working principle is similar to that of scissors. Its basic structure includes a moving knife and a fixed knife. There is a cutting gap between the moving knife and the fixed knife. When paper cutting is required, the moving knife rotates around a fulcrum to complete the paper cutting. The contact point of the moving knife blade is a single-point contact movement from left to right. For relevant literature, please refer to the Chinese invention patent application disclosure "Automatic Paper Cutting Thermal Printer Mechanism" with application number 201410389699.5 (application publication number CN 104149495 A).

[0004] The second type is the "V"-shaped knife type. The basic structure also includes a movable knife and a fixed knife. There is a cutting gap between the movable knife and the fixed knife. The movable knife is V-shaped. When paper cutting is required, the whole body is translated relative to the fixed knife to complete the paper cutting. The contact points of the movable knife blade are the left and right points moving from the edge to the middle; related literature can refer to the Chinese utility model patent "Thermal Printer" with patent number 202020554079.3 (authorization announcement number CN 212171695 U).

[0005] The paper cutting mechanisms of the above structures are more suitable for printing paper with a relatively small lateral width (within 4 inches to 118MM). If the lateral size exceeds this, the paper cutting kinetic energy required is relatively large, and the accuracy of the tool is difficult to ensure, resulting in greatly reduced reliability. At the same time, the service life is limited, the design and manufacturing requirements are high, it is not easy to produce and assemble, and the cost is relatively high. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a paper cutting mechanism suitable for printing paper with a larger horizontal width in view of the above-mentioned technical status quo.

[0007] The second technical problem to be solved by the present invention is to provide a printing mechanism suitable for printing paper with a larger horizontal width in view of the above-mentioned technical status quo.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a paper cutting mechanism, characterized in that it includes

[0009] frame;

[0010] A motor, which is arranged on one side of the frame and has a driving gear;

[0011] A driving pulley is rotatably disposed on the frame and close to one end of the motor;

[0012] The driven pulley is rotatably arranged on the aforementioned frame and away from one end of the motor.

[0013] A transmission gear set is arranged on the aforementioned frame and can transmit the power of the motor to the driving pulley;

[0014] An endless belt is wound around the outer circumference of the aforementioned driving pulley and the driven pulley, and the inner side of the endless belt has gear teeth adapted to the aforementioned driving pulley and the driven pulley;

[0015] The tool holder is connected to the aforementioned endless belt and can move back and forth relative to the frame along with the endless belt;

[0016] A fixed knife, which is arranged on the frame and parallel to the length direction of the endless belt; and

[0017] The movable knife assembly is arranged on the knife holder and can cooperate with the fixed knife to complete paper cutting during the moving process.

[0018] Preferably, the movable knife assembly comprises

[0019] The blade is rounded and has a cutting edge.

[0020] A wheel frame is rotatably arranged on the tool holder;

[0021] A guide wheel, sleeved on the wheel frame and close to one side of the blade;

[0022] A clamping ring is rotatably mounted on the blade holder and is in close contact with the other side of the blade; and

[0023] The compression spring is arranged on the tool holder and always forces the aforementioned clamping ring to clamp the blade.

[0024] When the knife holder is in the moving state, the guide wheel travels on the upper end surface of the fixed knife and can drive the knife blade to rotate.

[0025] Considering the smoothness and stability of paper cutting, the front end of the knife holder has a gradually raised front paper guide portion, and the blade is located at the end of the front paper guide portion.

[0026] Considering the orderly movement of the paper after cutting, the rear end of the knife holder has a wedge-shaped portion that can separate the printing paper.

[0027] Taking into account the convenience of installation and the tolerance of production errors, a positioning gear and a limit block are provided at the lower end of the tool holder. The teeth of the aforementioned positioning gear are adapted to the inner teeth of the annular belt, and the aforementioned limit block is close to the positioning gear and can limit the rotation of the positioning gear.

[0028] Furthermore, the frame includes a first straight-bar-shaped bracket and a second bracket arranged on one side of the first bracket, the driving pulley, the driven pulley and the endless belt are arranged on the first bracket, the fixed knife is arranged on the upper end surface of the first bracket, the motor and the transmission gear group are arranged on the second bracket, and a gear cover is provided on the outer side of the second bracket.

[0029] Furthermore, in order to ensure the lateral stability and reliability of the tool holder, the tool holder is provided with a guide groove with its port facing downward, and correspondingly, the upper end of the first bracket is provided with a guide rail that cooperates with the aforementioned guide groove.

[0030] The technical solution adopted by the present invention to solve the above second technical problem is: a printer mechanism, including a printer body and a paper cutting mechanism arranged at a paper output port of the printer body.

[0031] The connection between the printer body and the paper cutting mechanism is preferably as follows: the front end face of the printer body has a card hole, the lower end of the card hole has a first connecting hole, the rear end face of the paper cutting mechanism has a bent card block, the card block has a second connecting hole, and the card block extends into the card hole and connects the first connecting hole and the second connecting hole with a connecting component.

[0032] Compared with the prior art, the advantages of the present invention are: the circular blade rolls back and forth and cooperates with the fixed knife to complete paper cutting. Compared with the existing scissor-type and V-type paper cutting mechanisms, the advantages of the rolling paper cutting mechanism are:

[0033] a. The rolling type has better paper cutting quality: the thickness of the rolling circular blade is relatively thin (about 0.2mm), the blade cutting angle is relatively small, the resistance to cutting paper is relatively small, the pushing deformation of the paper by the paper cutting action is extremely small, and the cutting edge is neat; while the existing scissor-type and V-shaped cutters use the contact pressure between the moving and fixed blades to achieve the extrusion and tearing of the paper. In order to ensure the qualified contact pressure, the moving and fixed blades need to have a certain thickness (1 to 2mm), and a complex pressure mechanism is applied. The moving and fixed blades have a large angle (it is difficult to process a small angle of the blade with a thicker blade, and the sharpness of the blade decreases), which has a relatively large resistance to cutting paper, and at the same time causes a relatively serious degree of rolling deformation of the cut paper, and the neatness of the edge of the cut paper is relatively low (especially the scissor-type is more serious).

[0034] b. The reliability of rolling paper cutting is relatively high: the rolling circular blade has a cutting mode that moves horizontally and rotates gradually to press and cut into the paper. The force applied to the blade when cutting into the paper is gradually increased from small to large. The impact force of the paper on the blade is relatively small, and the degree of damage to the blade is relatively small. The local defects of the blade of the rotating circular blade have a relatively small impact on the paper cutting. The existing scissor-type and V-type paper cutting mechanisms rely on the contact and pressure of the moving and fixed blades against each other, and the contact point of the moving and fixed blades is unique. Once the pressure of a certain contact point of the moving and fixed blades is unqualified, the paper will not be cut well or continuously at that point. The poor cutting at this point will cause the pressure of the contact points of the subsequent moving and fixed blades to decrease, resulting in low paper cutting reliability and poor tolerance of blade defects.

[0035] c. The driving power of the rolling paper cutting mechanism is relatively small and the energy consumption is low;

[0036] d. The rolling paper cutting mechanism can achieve a relatively large cutting distance, while the scissor-type and V-type paper cutting mechanisms are more difficult to achieve long distances, and the cost performance is seriously reduced.

[0037] e. The rolling paper cutting mechanism has a higher cost-effectiveness than the scissor-type and V-type paper cutting mechanisms, and its parts are easy to manufacture and process, and its reliability is also relatively high.

[0038] f. Compared with the scissor-type and V-type paper cutting mechanisms, the rolling paper cutting mechanism has a small distance (less than 118mm) and is less expandable when paired with smaller thermal printers. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0040] Figure 2 It is an exploded view of the printer body and the paper cutting mechanism in the embodiment.

[0041] Figure 3 for Figure 2 Schematic diagram of the paper cutting mechanism.

[0042] Figure 4 This is the exploded view of the paper cutting mechanism.

[0043] Figure 5 It is a schematic diagram of the transmission part in the paper cutting mechanism.

[0044] Figure 6 for Figure 5 Schematic diagram of the structure from another perspective.

[0045] Figure 7 A state reference diagram is used for the embodiments. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the accompanying drawings.

[0047] like Figure 1 and Figure 2 As shown, the printer mechanism in this embodiment includes a printer body 6 and a paper cutting mechanism 10 disposed at a paper output port of the printer body 6 .

[0048] Combination Figure 2 and Figure 3 As shown, the front end face of the printer body 6 has a card hole 61, and the lower end of the card hole 61 has a first connecting hole 62. The rear end face of the paper cutting mechanism 10 has a bent card block 15, and the card block 15 has a second connecting hole 16. After the card block 15 extends into the card hole 61, the first connecting hole 62 and the second connecting hole 16 are connected by a connecting member 63 (which can be a screw).

[0049] Combination Figure 4 , Figure 5 and Figure 6 The paper cutting mechanism in this embodiment includes a frame 1, a motor 2, a driving pulley 33, a driven pulley 34, a transmission gear set 3, an endless belt 7, a knife frame 4, a fixed knife 8 and a movable knife assembly 5. The frame 1 includes a first bracket 11 in a straight strip shape and a second bracket 12 arranged on one side of the first bracket 11. The second bracket 12 is mainly composed of two vertical horizontal plates 11 arranged at an interval.

[0050] The motor 2 is arranged on one side of the second bracket 12, and a driving gear 21 and an optical coupling on-off turntable 22 are arranged on the output shaft of the motor 2. A corresponding optical coupling detector 23 is also arranged on the second bracket 12, and the optical coupling on-off turntable 22 and the corresponding optical coupling detector 23 cooperate to count the number of revolutions of the motor 2. The motor 2 in this embodiment can rotate forward and reverse.

[0051] The driving pulley 33 is a double gear, rotatably disposed on the first bracket 11 and close to one end of the motor 2; the specific position is located in the gap between the transverse plates 11. The driven pulley 34 is rotatably disposed on the first bracket 11 and away from one end of the motor 2, and is also located in the gap between the transverse plates 11. The annular belt 7 is wound around the outer circumference of the driving pulley 33 and the driven pulley 34, and the inner side of the annular belt 7 has gear teeth adapted to the driving pulley 33 and the driven pulley 34; the annular belt 7 can be a synchronous belt with an inner gear ring.

[0052] The transmission gear set 3 is arranged on the second bracket 12, and a gear cover 13 is arranged on the outer side of the second bracket 12 to seal the transmission gear set 3. The power input end of the transmission gear set 3 meshes with the driving gear 21, and the power output end meshes with the driving pulley 33, so that the power of the motor 2 can be transmitted to the driving pulley 33; the transmission gear set 3 in this embodiment is composed of a first gear 31 and a second gear 32, the first gear 31 is a double gear, which meshes with the driving gear 21 and the second gear 32 respectively, and the second gear 32 meshes with the driving pulley 33 which is also a double gear.

[0053] The tool holder 4 is connected to the annular belt 7 and can move back and forth relative to the frame 1 along with the annular belt 7; the tool holder 4 in this embodiment includes a base 41 and a tool head holder 42, the base 41 is connected and fixed to the annular belt 7, and the tool head holder 42 is arranged on the base.

[0054] The fixed knife 8 is arranged on the first bracket 11 and parallel to the length direction of the endless belt 7; the movable knife assembly 5 is rotatably arranged on the cutter head frame 42 through an axle pin 57. During the movement of the movable knife assembly 5, the blade 53 rotates and can cooperate with the fixed knife 8 to complete paper cutting.

[0055] The movable knife assembly 5 in this embodiment includes a blade 53, a wheel frame 51, a guide wheel 52, a collar 54 and a compression spring 55. The blade 53 is circular and has a cutting edge formed on its edge, extending downward from the blade of the fixed knife 8 and forming a cutting gap with the blade of the fixed knife 8.

[0056] The wheel frame 51 is rotatably arranged on the tool holder 4; the guide wheel 52 is sleeved on the wheel frame 51 and is close to one side of the blade 53; the guide wheel in this embodiment adopts an O-ring, and has a certain friction force when running on the upper end surface of the fixed knife 8. The clamping ring 54 is in a tower shape and has elasticity, fastened to the outer cylinder of the cylindrical tube of the wheel frame 51 passing through the guide wheel 52 and the blade 53, axially pressing the blade 53, the guide wheel 52, and the wheel frame 51 to fit together as a whole, and rotatably arranged on the support shaft 57 on the tool holder 4; the compression spring 55 is arranged between the tool holder cover plate 56 and the clamping ring 54, and drives the blade 53, which is closely fitted together as a whole, to approach one side of the tool holder 4 and to fit closely to the blade 81 of the fixed knife 8; one end of the support shaft 57 is fixedly arranged on the tool holder 4, passing through the wheel frame 51, the guide wheel 52, the blade 53, the clamping ring 54, and the other end is inserted into the cover plate 56.

[0057] The front end of the cutter head frame 42 has a gradually raised front paper guide 421, and the rear end of the cutter head frame 42 has a wedge-shaped portion 422 that can separate the printing paper. The blade 53 is located at the end of the front paper guide 421.

[0058] Combination Figure 6As shown, the base 41 and the annular belt 7 are connected and positioned by the following structure: a positioning gear 44 and a limit block 45 are provided at the lower end of the base 41, the gear teeth of the positioning gear 44 are adapted to the inner teeth of the annular belt 7, and the limit block 45 is divided into two pieces, which are respectively close to the two sides of the positioning gear 44, thereby limiting the rotation of the positioning gear 44.

[0059] The tool holder 4 has a guide groove 46 with the port facing downward. Figure 5 As shown, the guide groove 46 in this embodiment is formed by the gap between the side of the base 41 and the inner side of the lower end of the cutter head frame 42, and the upper end of the first bracket 11 has a guide rail 111 that cooperates with the guide groove 46. Figure 4 As shown, the top end of one of the transverse plates 11 in this embodiment forms a guide rail 111.

[0060] Working principle: Motor 2 transmits power to driving pulley 33 through transmission gear set 3, driving pulley 33 drives annular belt 7 and driven pulley 34 to rotate, and because knife holder 4 is fixedly connected to annular belt 34, knife holder 4 can be driven to move back and forth on first bracket 11. When knife holder 4 is in moving state, guide wheel 52 walks on the upper end surface of fixed knife 8 and can drive blade 53 to rotate, and blade 53 cooperates with blade 81 of fixed knife 8 to complete paper cutting. For each cutting, knife holder moves from one end of the first bracket to the other end. After cutting is completed, the motor reverses, and knife holder returns to the initial position to prepare for the second paper cutting. To ensure that both ends of knife holder 4 move into place and do not exceed the limit position, limit switches are provided at both ends of the first bracket.

[0061] Figure 7 As shown in the state reference diagram of the embodiment, the printing paper 100 enters from the rear end of the printer and is output from the front end, and is cut by the paper cutting mechanism 10 when being output.

Claims

1. A paper cutting mechanism, characterized in that include Rack (1); A motor (2) is arranged on one side of the frame (1) and has a driving gear (21); A driving pulley (33) is rotatably disposed on the frame (1) and close to one end of the motor (2); A driven pulley (34) is rotatably disposed on the frame (1) and at one end away from the motor (2). A transmission gear set (3) is arranged on the frame (1) and is capable of transmitting the power of the motor (2) to the driving pulley (33); An annular belt (7) is wound around the outer circumference of the aforementioned driving pulley (33) and the driven pulley (34), and the inner side of the annular belt (7) has gear teeth that are adapted to the aforementioned driving pulley (33) and the driven pulley (34); The tool holder (4) is connected to the aforementioned endless belt (7) and can move back and forth relative to the frame (1) along with the endless belt (7); A fixed knife (8) is disposed on the frame (1) and arranged parallel to the length direction of the endless belt (7); as well as A movable knife assembly (5) is arranged on the knife holder (4) and can cooperate with the fixed knife (8) to complete paper cutting during movement; The movable knife assembly (5) comprises The blade (53) is rounded and has a cutting edge. A wheel frame (51) is rotatably mounted on the tool holder (4); A guide wheel (52) is sleeved on the wheel frame (51) and is closely attached to one side of the blade (53); A clamping ring (54) is rotatably disposed on the aforementioned blade holder (4) and is closely attached to the other side of the blade (53); as well as The compression spring (55) is arranged on the blade holder (4) and always forces the clamping ring (54) to clamp the blade (53). When the knife holder (4) is in a moving state, the guide wheel (52) travels on the upper end surface of the fixed knife (8) and can drive the blade (53) to rotate.

2. The paper cutting mechanism according to claim 1, characterized in that The front end of the knife holder (4) has a gradually raised front paper guide portion (421), and the blade (53) is located at the end of the front paper guide portion (421).

3. The paper cutting mechanism according to claim 1, characterized in that The rear end of the knife holder (4) has a wedge-shaped portion (422) capable of separating printing paper.

4. The paper cutting mechanism according to claim 1, characterized in that A positioning gear (44) and a limiting block (45) are provided at the lower end of the tool holder (4), the gear teeth of the positioning gear (44) being adapted to the inner teeth of the annular belt (7), and the limiting block (45) being close to the positioning gear (44) and capable of limiting the rotation of the positioning gear (44).

5. The paper cutting mechanism according to claim 1, characterized in that The frame (1) comprises a first bracket (11) in the shape of a straight strip and a second bracket (12) arranged on one side of the first bracket (11); the driving pulley (33), the driven pulley (34) and the endless belt (7) are arranged on the first bracket (11); the fixed knife (8) is arranged on the upper end surface of the first bracket (11); the motor (2) and the transmission gear set (3) are arranged on the second bracket (12); and a gear cover (13) is arranged on the outer side of the second bracket (12).

6. The paper cutting mechanism according to claim 5, characterized in that The tool holder (4) is provided with a guide groove (46) with its end facing downwards, and correspondingly, the upper end of the first bracket (11) is provided with a guide rail (111) which cooperates with the guide groove (46) for guiding.

7. A printer mechanism having a paper cutting mechanism according to any one of claims 1 to 6, comprising a printer body (6) and a paper cutting mechanism (10) arranged at a paper outlet port of the printer body (6).

8. The printer mechanism according to claim 7, characterized in that The front end surface of the printer body (6) has a clamping hole (61), and the lower end of the clamping hole (61) has a first connecting hole (62). The rear end surface of the paper cutting mechanism (10) has a bent clamping block (15), and the clamping block (15) has a second connecting hole (16). After the clamping block (15) extends into the clamping hole (61), the first connecting hole (62) and the second connecting hole (16) are connected by a connecting member.

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