Printer paper cutting mechanism and printer

Abstract

The utility model provides a printer paper cutting mechanism and a printer, the printer paper cutting mechanism comprises an installation support, a first belt wheel, a second belt wheel, a transmission belt, a knife rest and a blade, the transmission belt is connected between the first belt wheel and the second belt wheel, the knife rest is connected on the transmission belt, and the blade is installed on the knife rest; the printer paper cutting mechanism further comprises a floating frame and an elastic piece. The floating frame is rotationally connected with the mounting bracket along a first axis, and the second belt wheel is rotationally connected with the floating frame along a second axis biased to the first axis; the elastic piece abuts between the mounting support and the floating frame, and under the action of elastic force of the elastic piece, the floating frame tends to rotate around the first axis and deviates from the first belt wheel so that the transmission belt can be tensioned. The printer comprises the printer paper cutting mechanism. And due to the arrangement of the floating frame and the elastic piece, the transmission belt can keep tensioned and keep a good transmission relation with the two belt wheels, unsmooth rotation and abnormal sound are avoided, and the paper cutting quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a printer paper cutting mechanism and a printer. Background Art

[0002] The existing printer paper cutting mechanism includes a mounting bracket, a transmission belt assembly, a knife holder and a blade. The transmission belt assembly includes a driving pulley, a driven pulley and a transmission belt meshed between the driving pulley and the driven pulley. The driving pulley and the driven pulley are arranged opposite to each other on the mounting bracket and the rotation axes of the driving pulley and the driven pulley are fixed. The knife holder is connected to the transmission belt and the blade is installed on the knife holder. The motor drives the driving pulley to drive the transmission belt to work, and the knife holder and the blade thereon move with the transmission belt to perform paper cutting.

[0003] The problem with the existing paper cutting mechanism of this type of printer is that when the pulley is not tensioned, abnormal noise or uneven rotation may occur during the forward and reverse rotation of the motor because the transmission belt cannot fit tightly against the pulley teeth after being stretched by the force, which in turn causes loud noise and poor cutting effect during paper cutting, or even failure to complete paper cutting. Utility Model Content

[0004] The first purpose of the utility model is to provide a printer paper cutting mechanism, which can ensure that the belt wheel and the transmission belt maintain a good transmission relationship and solve the problems of uneven transmission and abnormal noise.

[0005] The second purpose of the utility model is to provide a printer that solves the problems of uneven transmission and abnormal noise.

[0006] The first purpose of the utility model provides a printer paper cutting mechanism comprising a mounting bracket, a first pulley, a second pulley, a transmission belt, a knife holder and a blade, wherein the first pulley and the second pulley are arranged opposite to each other on the mounting bracket, the transmission belt is connected between the first pulley and the second pulley, the knife holder is connected to the transmission belt, and the blade is connected to the knife holder; the printer paper cutting mechanism also comprises a floating frame and an elastic member; the floating frame is rotationally connected to the mounting bracket along a first axis, and the second pulley is rotationally connected to the floating frame along a second axis offset from the first axis; the elastic member abuts between the mounting bracket and the floating frame, and under the action of the elastic force of the elastic member, the floating frame tends to swing around the first axis away from the first pulley and then tightens the transmission belt.

[0007] It can be seen from the above scheme that under the setting of the floating frame and the elastic member, the second pulley tends to move away from the first pulley, so that the transmission belt connected between the first pulley and the second pulley can remain tensioned and maintain a good transmission relationship with the two pulleys, avoiding uneven rotation and abnormal noise, thereby ensuring the quality of paper cutting.

[0008] A further solution is that the elastic member includes a torsion spring; the printer paper cutting mechanism also includes a first shaft, the first shaft is arranged at the first axis, the torsion spring is sleeved on the first shaft, the first arm of the torsion spring abuts on the mounting bracket, and the second arm of the torsion spring abuts on the floating frame.

[0009] It can be seen from the above that, compared with other elastic parts, the torsion spring as a standard part is very suitable for installation between the fixed part and the swinging part to provide a swinging force for the swinging part, and it occupies less space when installed at the first axis, and can complete the elastic floating installation connection of the floating frame while maintaining the original size of the paper cutting mechanism.

[0010] A further solution is that the first arm includes at least two first rods spaced apart in the axial direction of the first axis; and / or the second arm includes at least two second rods spaced apart in the axial direction of the first axis.

[0011] As can be seen from the above, under this setting, the contact span between the first arm and the mounting bracket is increased. Similarly, the contact span between the second arm and the floating frame is also increased, thereby improving the stability of the floating swing of the floating frame and further ensuring the tensioning effect.

[0012] In a further embodiment, the first arm further comprises a crossbar connected between the ends of the two first rods, and the crossbar abuts against the surface of the mounting bracket.

[0013] As can be seen from the above, this arrangement enables the torsion spring and the mounting bracket to abut against each other more stably.

[0014] A further solution is that the floating frame includes two side walls arranged opposite to each other in the axial direction of the first axis, and the second pulley is arranged between the two side walls; a hook is arranged at the end of the second rod, and the hooks of the two second rods are hooked on the two side walls respectively.

[0015] As can be seen from the above, under this arrangement, both axial sides of the second pulley are blocked by two side walls respectively, thereby preventing the pulley and the transmission belt from loosening and having a shielding and protective function; in addition, the torsion spring is formed by winding a metal wire, and the two ends of the wire are exactly the two second rods separated from each other on the second arm, and the two second rods can just cooperate with the two side walls separated from each other to form a reliable buckling relationship.

[0016] A further solution is that the floating frame further comprises a transverse wall connected between the two side walls, and the transverse wall shields the second pulley from the front facing away from the first pulley.

[0017] As can be seen from the above, this arrangement improves the structural strength of the floating frame, the floating frame is easy to process and shape, and plays a certain shielding and protective role on the second pulley and the transmission belt.

[0018] In a further solution, the printer paper cutting mechanism also includes a fixing frame and a driving unit, the driving unit is connected to the fixing frame, the first pulley serves as an active pulley and cooperates with the driving unit in transmission; the fixing frame is fixedly connected to the mounting bracket.

[0019] As can be seen from the above, the motor that drives the transmission belt assembly is integrated into the printer's paper cutting mechanism, which is conducive to modular assembly of the product.

[0020] Another further solution is that a track is provided on the mounting bracket, and the tool holder is slidably matched with the track.

[0021] As can be seen from the above, under this setting, the mounting bracket is also used to slide with the knife holder to ensure the straightness and stability of the knife holder's translation and ensure the paper cutting effect.

[0022] Another further solution is that the second pulley is a driven pulley.

[0023] As can be seen from the above, the driving pulley needs to cooperate with the motor, and installing the driving pulley on the floating frame will affect the layout of the motor. For this reason, the utility model chooses to set the second pulley in a floating manner to reduce the impact on the layout of other structures.

[0024] The second object of the utility model is to provide a printer including a printer paper cutting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of an embodiment of the paper cutting mechanism of a printer of the utility model.

[0026] Figure 2 It is a partial view of one side of the driven pulley of the paper cutting mechanism embodiment of the utility model printer.

[0027] Figure 3 It is a partial view of one side of the driving pulley of the paper cutting mechanism embodiment of the utility model printer.

[0028] Figure 4 This is a structural diagram of a paper cutting mechanism embodiment of a utility model printer with a hidden mounting bracket.

[0029] Figure 5 This is a structural exploded view of one side of the driven pulley of an embodiment of the utility model printer paper cutting mechanism. DETAILED DESCRIPTION

[0030] See also Figures 1 to 3The printer includes a printer paper cutting mechanism. The printer paper cutting mechanism of this embodiment includes a mounting bracket 1, a transmission belt assembly, a motor 20, a knife holder 3, a blade 4, a floating frame 5, a torsion spring 6, a fixed frame 7, a first shaft 81 and a second shaft 82, wherein the transmission belt assembly includes a first pulley 21, a second pulley 22 and a transmission belt 23, the first pulley 21 is a driving pulley and the second pulley 20 is a driven pulley, the torsion spring 6 is an elastic member of the utility model, the first shaft 81 is a screw, the second shaft 82 is a pin, and the motor 20 is a driving unit of the utility model.

[0031] The first pulley 21 and the second pulley 22 are arranged on the mounting bracket 1 in a relative manner along the length direction of the mounting bracket 1, the transmission belt 23 is connected between the first pulley 21 and the second pulley 22, the tool holder 3 is connected to the transmission belt 23, and the blade 4 is installed on the tool holder 3. The first pulley 21 is connected to the output shaft of the motor 20, so that when the motor 20 is working, the transmission belt 23 moves and drives the tool holder 3 and the blade 4 thereon to move, and then paper cutting can be performed, wherein the mounting bracket 1 is a profile, on which a track 11 arranged along its length direction is formed, and a slide groove 31 is arranged on the tool holder 3, and the slide groove 31 is installed with the track 11 to realize the sliding cooperation between the tool holder 3 and the mounting bracket 1 along the above-mentioned length direction, thereby ensuring the straightness of the movement of the tool holder 3 and the blade 4.

[0032] Among them, see Figure 3 and Figure 4 The fixing frame 7 is fixedly mounted on the mounting bracket 1 , the main body of the motor 20 is fixed to the fixing frame 7 , and the output shaft of the motor 20 passes through the fixing frame 7 and is transmission-connected with the first pulley 21 .

[0033] Mainly, the present invention arranges the second pulley 22 in an elastic floating form to ensure the tensioning of the transmission belt 23 .

[0034] Recombination Figure 4, wherein the floating frame 5 is connected to the mounting bracket 1 by rotating along the first axis 91 through the first axis 81, and the floating frame 5 can swing around the first axis 91; the second axis 92 is installed on the floating frame 5 at the position of the second axis 92, and the second pulley 22 is rotatably installed on the floating frame 5 through the second axis 92. Since the second axis 92 is offset from the first axis 91, that is, the second axis 92 is parallel to the first axis 91 but the two do not overlap, in fact, the position of the second axis 92 and the position of the second pulley 22 are the swing ends of the floating frame 5. When the floating frame 5 swings around the first axis 91, the second pulley 22 also swings accordingly. However, the utility model also arranges a torsion spring 6 between the mounting bracket 1 and the floating frame 5 to force the floating frame 5 to swing away from the first pulley 21, so that the transmission belt 23 connected between the first pulley 21 and the second pulley 22 remains tensioned. The transmission belt 23 connected between the first belt pulley 21 and the second belt pulley 22 can be kept taut and maintain a good transmission relationship with the two belt pulleys, thereby avoiding uneven rotation and abnormal noise, and ensuring the quality of paper cutting.

[0035] In addition, in the conventional printer paper cutting mechanism without the floating frame 5 and the torsion spring 6, since the transmission belt is not tensioned, the transmission belt tends to be tensioned and cutting can be performed only when the cutter moves toward the driving wheel. When the cutter returns to the opposite side of the driving wheel, the transmission belt tends to be loose and stable and effective cutting cannot be achieved. Figure 1 In the conventional printer paper cutting mechanism which does not have the floating frame 5 and the torsion spring 6, the paper cutting can be completed only when the cutter moves to the right.

[0036] The unexpected effect is that after the transmission belt 23 connected between the first pulley 21 and the second pulley 22 is kept tensioned under the action of the torsion spring 6, no matter what movement direction the transmission belt 23, the knife holder 3 and the blade 4 are in, the tensioned transmission belt 23 can drive the knife holder 3 to move forward stably, thereby enabling the utility model to achieve bidirectional paper cutting.

[0037] Recombination Figure 5 Further, the floating frame 5 includes two side walls 51 arranged opposite to each other in the axial direction of the first axis 91 and a transverse wall 52 bent and connected between the two side walls 51. The two side walls 51 are opposite to each other and a position 50 is formed therebetween. The first shaft 81 and the second shaft 82 are both connected between the two side walls 51. The second pulley 22 is sleeved on the second shaft 82 and is located in the position 50 between the two side walls 51. At this time, the two side walls 51 shield and protect the second pulley 22 from both axial sides of the first axis 91, and the transverse wall 52 shields and protects the second pulley 22 from the front facing away from the first pulley 21.

[0038] The torsion spring 6 includes a base 60 and a first arm 61 and a second arm 62 extending from opposite sides of the base 60. In this embodiment, the first arm 61 includes at least two first rods 611 spaced apart in the axial direction of the first axis 91 and a cross rod 612 extending along the axial direction of the first axis 91 and connected between the ends of the two first rods 611. The second arm 62 includes at least two second rods 621 spaced apart in the axial direction of the first axis 91, and a hook 622 is provided at the end of each of the two second rods 621. Unlike the first arm 61, the two second rods 621 are separated from each other. The base 60 is mainly annular and is used to be mounted on the first shaft 81.

[0039] Among them, since the torsion spring 6 is formed by bending a metal wire, it has only two wire ends, one wire end is extended from the second arm 62 to the base 60 as a second rod 621, and is wound into the first ring part, and then wound out to the first arm 61, and then passes through the first first rod 611, the cross rod 612, the second second rod 611 in sequence, and then returns to the second ring part of the base 60, and finally returns to the other second rod 621 of the second arm 62. As a result, the first arm 61 of the torsion spring 6 is frame-shaped and the second arm 62 is double-legged.

[0040] After the torsion spring 6 is placed at position 50, the first shaft 81 passes through the base 60, and the torsion spring 6 can be rotatably fixed to the floating frame 5 around the first axis 91, and the cross bar 612 of the first arm 61 will abut against the inner surface of the recess 12 of the mounting bracket 1, and the axial position of the first arm 61 is limited by the recess 12; the hooks 622 at the ends of the two second rods 621 of the second arm 62 are respectively buckled on the edges of the two side walls 51. In this way, the elastic fit is provided with better stability and reliability under the premise of realizing the elastic floating of the floating frame 5.

[0041] In other embodiments, the elastic member may also be a pressure spring or a tension spring.

[0042] In other embodiments, the second pulley is a driving pulley, and in this case, the driving unit needs to be connected to the floating frame.

[0043] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A printer paper cutting mechanism, comprising a mounting bracket, a first belt pulley, a second belt pulley, a transmission belt, a knife holder and a blade, wherein the first belt pulley and the second belt pulley are arranged opposite to each other on the mounting bracket, the transmission belt is connected between the first belt pulley and the second belt pulley, the knife holder is connected to the transmission belt, and the blade is connected to the knife holder; Features: The printer paper cutting mechanism also includes a floating frame and an elastic member; The floating frame is rotatably connected to the mounting bracket along a first axis, and the second pulley is rotatably connected to the floating frame along a second axis offset from the first axis; The elastic member is in contact between the mounting bracket and the floating frame. Under the elastic force of the elastic member, the floating frame tends to swing around the first axis away from the first pulley, thereby tightening the transmission belt.

2. The printer paper cutting mechanism according to claim 1, characterized in that: The elastic member comprises a torsion spring; The printer paper cutting mechanism also includes a first shaft, which is arranged at the first axis center. The torsion spring is sleeved on the first shaft, the first arm of the torsion spring abuts against the mounting bracket, and the second arm of the torsion spring abuts against the floating frame.

3. The printer paper cutting mechanism according to claim 2, characterized in that: The first arm includes at least two first rods spaced apart in the axial direction of the first axis; And / or, the second arm includes at least two second rods spaced apart in the axial direction of the first axis.

4. The printer paper cutting mechanism according to claim 3, characterized in that: The first arm further includes a crossbar connected between the ends of the two first rods, and the crossbar abuts against the surface of the mounting bracket.

5. The printer paper cutting mechanism according to claim 3, characterized in that: The floating frame includes two side walls arranged opposite to each other in the axial direction of the first axis, and the second pulley is arranged between the two side walls; A hook portion is provided at the end of the second rod, and the hook portions of the two second rods are respectively hooked on the two side walls.

6. The printer paper cutting mechanism according to claim 5, characterized in that: The floating frame further comprises a transverse wall connected between the two side walls, and the transverse wall shields the second pulley from the front facing away from the first pulley.

7. The printer paper cutting mechanism according to any one of claims 1 to 6, characterized in that: The printer paper cutting mechanism further comprises a fixing frame and a driving unit, wherein the driving unit is connected to the fixing frame, and the first belt wheel serves as a driving belt wheel and cooperates with the driving unit in transmission; The fixing frame is fixedly connected to the mounting bracket.

8. The printer paper cutting mechanism according to any one of claims 1 to 6, characterized in that: The mounting bracket is provided with a track, and the tool holder is slidably matched with the track.

9. The printer paper cutting mechanism according to any one of claims 1 to 6, characterized in that: The second pulley is a driven pulley.

10. A printer, characterized in that The printer paper cutting mechanism comprises any one of claims 1 to 9.

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