Transmission mechanism, clutch and printer

Abstract

A transmission mechanism, a clutch and a printer, the transmission mechanism comprises a first shaft body and a second shaft body which are coaxially arranged, the first shaft body and the second shaft body are connected through a connecting structure, and the first shaft body and the second shaft body are respectively provided with a first gear and a second gear; in the axial direction of the first shaft body, the first gear comprises a first end face and a second end face, the second gear comprises a third end face and a fourth end face, the first end face, the second end face, the third end face and the fourth end face are sequentially arranged, part of the second end face protrudes to form a first friction part, and the first friction part abuts against the third end face. According to the gear, part of the second end face of the first gear protrudes to form the first friction part, and the first friction part is used for abutting against the third end face of the second gear, so that the contact area of the first gear and the second gear is effectively reduced; therefore, the problem of clutch operation failure caused by the fact that lubricating oil permeates between the second end face and the third end face from the teeth of the first gear or the second gear is restrained.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission technology, specifically to a transmission mechanism, a clutch, and a printer. Background Technology

[0002] As printer technology continues to develop, the internal transmission mechanisms of printers are also constantly being improved and perfected. Many key rotating components in printers, such as shafts or rollers, require transmission clutches due to space and cost limitations, which limit the number of motors.

[0003] In related technologies, printer clutches typically employ a gear transmission structure, using the meshing and disengagement of gears to transmit and cut off power. During prolonged use, lubricating oil can seep from the gear teeth into the clutch components, causing lubrication between the two parts. This can prevent the clutch from functioning properly under the action of the tension spring, resulting in occasional clutch operation failure. Utility Model Content

[0004] The purpose of this application is to provide a transmission mechanism, a clutch, and a printer to solve the problem of transmission failure in the transmission mechanism.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, this application provides a transmission mechanism, comprising:

[0007] A first shaft and a second shaft are coaxially arranged, the first shaft and the second shaft are connected by a connecting structure, and a first gear and a second gear are respectively provided on the first shaft and the second shaft;

[0008] Along the axial direction of the first shaft, the first gear includes a first end face and a second end face, and the second gear includes a third end face and a fourth end face. The first end face, the second end face, the third end face and the fourth end face are arranged sequentially. A portion of the second end face protrudes to form a first friction part, and the first friction part abuts against the third end face.

[0009] In one embodiment, the first friction part is an arc-shaped protrusion, and the first friction part is arranged circumferentially around the first shaft.

[0010] In one embodiment, the first friction portion includes a plurality of dot-shaped protrusions, which are spaced apart in the circumferential and / or radial direction of the first shaft.

[0011] In one embodiment, a portion of the third end face protrudes to form a second friction portion that abuts against the first friction portion, and the structure of the first friction portion is the same as the structure of the second friction portion.

[0012] In one embodiment, the connection structure includes a slot and a buckle. The slot extends through the first end face and the second end face, and the buckle is disposed on the third end face. The buckle passes through the slot and engages with the first end face.

[0013] In one embodiment, in the circumferential direction of the first shaft, the slot includes a first slot wall and a second slot wall located at both ends, the buckle is movably disposed between the first slot wall and the second slot wall, and the buckle can abut against the first slot wall or the second slot wall.

[0014] In one embodiment, the transmission mechanism further includes an elastic element, which is connected to the first gear and the second gear respectively. The elastic element is in an elastic deformation state and has a tendency to push the second shaft to rotate relative to the first shaft.

[0015] In one embodiment, a first connecting portion and an arc-shaped groove are provided on the first end face, and a second connecting portion is provided on the third end face. The second connecting portion protrudes from the first end face through the arc-shaped groove, and the two ends of the elastic member are respectively connected to the first connecting portion and the second connecting portion.

[0016] The elastic element is in an elastic deformation state and has a tendency to push the first gear and the second gear closer to each other.

[0017] Secondly, this application also provides a clutch, including a drive gear and a transmission mechanism as described in any one of the various embodiments of the first aspect, wherein the first gear is provided with a first under-tooth portion, the second gear is provided with a second under-tooth portion, and both the first under-tooth portion and the second under-tooth portion are used to accommodate the drive gear.

[0018] Thirdly, this application also provides a printer including the clutch described in the second aspect, with loads respectively connected to the first shaft and / or the second shaft.

[0019] Compared with the prior art, this application has at least the following beneficial effects:

[0020] 1. In this application, by protruding a portion of the second end face of the first gear to form a first friction part, the first friction part is used to abut against the third end face of the second gear, which effectively reduces the contact area between the first gear and the second gear, thereby suppressing the problem of clutch operation failure caused by lubricating oil seeping from the teeth of the first gear or the second gear into the space between the second end face and the third end face.

[0021] 2. In this application, since the contact area between the first gear and the second gear is reduced, even if lubricating oil seeps in, it will not generate enough resistance to affect the normal operation of the transmission mechanism, thereby significantly improving the reliability and service life of the transmission mechanism and suppressing the generation of noise during operation.

[0022] 3. In this application, the transmission mechanism does not require additional components such as tension springs or shims. It can be achieved simply by modifying the structure of the first gear, which greatly reduces the manufacturing cost. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a perspective view of a transmission mechanism according to one embodiment of this application;

[0025] Figure 2 This is a perspective view of a transmission mechanism according to one embodiment of this application.

[0026] Figure 3 An exploded view of a transmission mechanism according to one embodiment of this application;

[0027] Figure 4 This is a side view of the first gear in Embodiment 1 of this application;

[0028] Figure 5 This is a side view of the first gear in Embodiment 2 of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100, First shaft; 200, Second shaft; 210, Triggering part; 300, First gear; 310, First end face; 311, First connecting part; 312, Arc groove; 320, Second end face; 330, First friction part; 331, Dot-shaped protrusion; 340, First tooth-deficient part; 400, Second gear; 410, Third end face; 411, Second connecting part; 420, Fourth end face; 430, Second tooth-deficient part; 500, Connecting structure; 510, Slot; 511, First slot wall; 512, Second slot wall; 520, Buckle; 600, Elastic element. Detailed Implementation

[0031] The following are specific embodiments of this application, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments.

[0032] Example 1

[0033] refer to Figures 1-4 This application provides a transmission mechanism, including a first shaft 100 and a second shaft 200 coaxially arranged, the first shaft 100 and the second shaft 200 being connected by a connecting structure 500, and a first gear 300 and a second gear 400 respectively provided on the first shaft 100 and the second shaft 200.

[0034] Along the axial direction of the first shaft 100, the first gear 300 includes a first end face 310 and a second end face 320, and the second gear 400 includes a third end face 410 and a fourth end face 420. The first end face 310, the second end face 320, the third end face 410 and the fourth end face 420 are arranged sequentially. A portion of the second end face 320 protrudes to form a first friction part 330, which abuts against the third end face 410.

[0035] The first shaft 100 is a cylindrical structure made of metal. The second shaft 200 is also a cylindrical structure made of metal. The first shaft 100 and the second shaft 200 are coaxially arranged and connected by a connecting structure 500, allowing the first shaft 100 and the second shaft 200 to rotate relative to each other within a certain angle range.

[0036] The first gear 300 is fixedly mounted on the first shaft 100, and the second gear 400 is fixedly mounted on the second shaft 200. The first gear 300 includes a second end face 320 facing the second gear 400 and a first end face 310 away from the second gear 400. The second gear 400 includes a third end face 410 facing the first gear 300 and a fourth end face 420 away from the first gear 300.

[0037] A portion of the upper part of the second end face 320 protrudes to form a first friction part 330. The first friction part 330 abuts tightly against the third end face 410 to reduce the contact area between the first gear 300 and the second gear 400.

[0038] When the first shaft 100 and the second shaft 200 rotate relative to each other, friction is generated between the first friction part 330 and the third end face 410. This friction can control the relative rotation speed between the first shaft 100 and the second shaft 200, thus acting as a deceleration or braking mechanism. Simultaneously, the contact between the first friction part 330 and the third end face 410 also prevents relative movement between the first gear 300 and the second gear 400, ensuring the stability of the transmission.

[0039] In this application, by protruding a portion of the second end face 320 of the first gear 300 to form a first friction part 330, the first friction part 330 is used to abut against the third end face 410 of the second gear 400, which effectively reduces the contact area between the first gear 300 and the second gear 400, thereby suppressing the problem of clutch operation failure caused by lubricating oil seeping from the teeth of the first gear 300 or the second gear 400 into the space between the second end face 320 and the third end face 410.

[0040] Because the contact area between the first gear 300 and the second gear 400 is reduced, even if lubricating oil seeps in, it will not generate enough resistance to affect the normal operation of the transmission mechanism, thereby significantly improving the reliability and service life of the transmission mechanism and suppressing the generation of noise during operation.

[0041] Furthermore, the transmission mechanism does not require additional components such as tension springs or shims; it can be achieved simply by modifying the structure of the first gear 300, which greatly reduces manufacturing costs.

[0042] In this embodiment, the first friction part 330 is an arc-shaped protrusion, and the first friction part 330 is arranged circumferentially around the first shaft 100. Specifically, the first friction part 330 is continuously distributed circumferentially around the first shaft 100, so that the friction force is uniformly transmitted along the circumferential direction, avoiding stress concentration caused by local contact between the first gear 300 and the second gear 400, improving transmission smoothness, and reducing vibration and noise.

[0043] The first friction part 330 can be a closed arc around the first shaft 100, or it can be an arc with a central angle in the range of 120 degrees to 300 degrees.

[0044] The connecting structure 500 includes a slot 510 and a buckle 520. The slot 510 passes through the first end face 310 and the second end face 320. The buckle 520 is disposed on the third end face 410 and passes through the slot 510 to engage with the first end face 310. The top of the buckle 520 is provided with a barb structure. When the buckle 520 passes through the slot 510, the buckle 520 is engaged with the first end face 310 by the barb structure, preventing the buckle 520 from falling out and achieving axial positioning of the first gear 300 and the second gear 400.

[0045] In the circumferential direction of the first shaft 100, the slot 510 includes a first slot wall 511 and a second slot wall 512 located at both ends. The latch 520 is movably disposed between the first slot wall 511 and the second slot wall 512, and the latch 520 can abut against either the first slot wall 511 or the second slot wall 512 to allow the first gear 300 and the second gear 400 to rotate relative to each other. For example, when the latch 520 abuts against the first slot wall 511, the relative angle between the first shaft 100 and the second shaft 200 is 0 degrees; when the latch 520 abuts against the second slot wall 512, the relative angle between the first shaft 100 and the second shaft 200 is 40 degrees.

[0046] In this embodiment, the transmission mechanism further includes an elastic element 600, which is connected to the first gear 300 and the second gear 400 respectively. The elastic element 600 is in an elastic deformation state and has a tendency to push the second shaft 200 to rotate relative to the first shaft 100. Specifically, the first shaft 100 is connected to a load, and the elastic force of the elastic element 600 in its deformed state is insufficient to drive the first shaft 100 to rotate the load. When the external force restricting the second shaft 200 is removed, the second shaft 200 is in a free state and rotates under the control of the elastic force of the elastic element 600, thereby causing the second gear 400 to rotate.

[0047] Optionally, the elastic element 600 is a spring. As an alternative implementation, the elastic element 600 can be replaced with other components or structures with elastic deformation capabilities.

[0048] The first end face 310 is provided with a first connecting portion 311 and an arc-shaped groove 312. The first connecting portion 311 is a protruding structure, and the arc-shaped groove 312 penetrates through the first end face 310 and the second end face 320. The third end face 410 is provided with a second connecting portion 411. The second connecting portion 411 is a columnar structure and protrudes from the first end face 310 through the arc-shaped groove 312. The two ends of the elastic member 600 are respectively connected to the first connecting portion 311 and the second connecting portion 411.

[0049] The elastic element 600 is in an elastic deformation state and has a tendency to push the first gear 300 and the second gear 400 closer together. When an external force is applied to the first shaft 100 or the second shaft 200, the elastic force of the elastic element 600 can be overcome, causing the first shaft 100 and the second shaft 200 to rotate relative to each other; when the external force disappears, the first shaft 100 and the second shaft 200 will return to their initial positions under the action of the elastic element 600.

[0050] The transmission mechanism provided in this embodiment can be applied to occasions where the rotation angle needs to be controlled, such as the paper feeding mechanism of a printer and the scanning mechanism of a copier.

[0051] Example 2

[0052] refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 Unlike Embodiment 1, the first friction part 330 in this embodiment includes a plurality of dot-shaped protrusions 331, which are spaced apart in the circumferential and radial directions of the first shaft 100. Specifically, the dot-shaped protrusions 331 are hemispherical structures, and are evenly distributed in the circumferential direction, with an angle of 15 to 30 degrees between two adjacent dot-shaped protrusions 331; or, multiple rows of dot-shaped protrusions 331 are arranged in the radial direction, with the diameter of the dot-shaped protrusions 331 gradually increasing from the inside to the outside, and the dot-shaped protrusions 331 on adjacent rows being staggered.

[0053] The dot-shaped protrusions 331 are made of the same material as the first gear 300, and have good wear resistance. When the first friction part 330 abuts against the third end face 410, the dot-shaped protrusions 331 will produce slight elastic deformation, thereby increasing the friction.

[0054] In this embodiment, a portion of the third end face 410 of the second gear 400 protrudes to form a second friction part that abuts against the first friction part 330. The structure of the first friction part 330 is the same as that of the second friction part. The second friction part also includes a plurality of dot-shaped protrusions 331, the size, distribution, and material of which are exactly the same as those of the dot-shaped protrusions 331 on the first friction part 330. The dot-shaped protrusions 331 on the first friction part 330 and the dot-shaped protrusions 331 on the second friction part are arranged alternately. When the first friction part 330 abuts against the second friction part, the dot-shaped protrusions 331 on both parts mesh with each other, increasing friction and contact stability.

[0055] Compared to the arc-shaped protrusion in Embodiment 1, this dot-shaped protrusion design has the advantages of more contact points and more uniform friction distribution, making it suitable for occasions that require more precise control of friction.

[0056] This application provides a clutch, including a drive gear and a transmission mechanism as shown in Embodiment 1 or Embodiment 2. The first gear 300 is provided with a first toothed portion 340, and the second gear 400 is provided with a second toothed portion 430. Both the first toothed portion 340 and the second toothed portion 430 are used to accommodate the drive gear (not shown).

[0057] The first missing tooth portion 340 is the part of the first gear 300 that lacks a tooth, and the second missing tooth portion 430 is the part of the second gear 400 that lacks a tooth. The first missing tooth portion 340 and the second missing tooth portion 430 are circumferentially opposite each other. When the first shaft 100 and the second shaft 200 are in their initial positions, the first missing tooth portion 340 and the second missing tooth portion 430 coincide exactly.

[0058] When the drive gear rotates, if it meshes with the teeth of the first gear 300 and the second gear 400, it will drive the first gear 300 and the second gear 400 to rotate. If the drive gear is located at the position corresponding to the first under-tooth portion 340 and the second under-tooth portion 430, it will idle and will not drive the first gear 300 and the second gear 400 to rotate. By controlling the position of the drive gear, the engagement and disengagement functions of the clutch can be achieved.

[0059] A trigger part 210 is provided on the second shaft 200. The trigger part 210 cooperates with a switch. The switch supports and prevents the trigger part 210 from moving, thereby preventing the second shaft 200 from moving and keeping the second gear 400 in the first position. When the switch is removed, the trigger part 210 loses its support and is controlled by the elastic element 600 to move, causing the second gear 400 to mesh with the drive gear. The second shaft 200 further rotates and is integrated with the first shaft 100 through the connecting structure 500, thereby driving the first shaft 100 to rotate, and in turn driving the load connected to the first shaft 100 to rotate.

[0060] This application provides a printer in which a clutch is used for the transmission connection of the printer's inner rollers and shafts, with loads connected to the first shaft 100 and / or the second shaft 200 respectively. This solution utilizes the under-tooth structure of a gear to achieve clutch engagement, which requires relatively low machining precision and significantly reduces the manufacturing cost of the clutch, thereby reducing the overall manufacturing cost of the printer.

[0061] The printer includes a frame, a printhead, a paper feed mechanism, and a control system. A clutch is mounted on the frame. A first shaft 100 is connected to the paper feed rollers to control paper feed; a second shaft 200 is connected to the printhead moving mechanism to control the lateral movement of the printhead.

[0062] The drive gear is connected to the printer's main motor. When the printer is working, the main motor drives the drive gear to rotate. The drive gear meshes with the first gear 300 and the second gear 400, respectively driving the paper feed roller and the print head moving mechanism.

[0063] When paper feeding or printhead movement needs to be controlled independently, the relative position between the first shaft 100 and the second shaft 200 can be adjusted by the control system so that the first toothed portion 340 or the second toothed portion 430 corresponds to the drive gear, thereby achieving selective transmission. For example, when only paper feeding is required without moving the printhead, the position of the second shaft 200 can be adjusted so that the second toothed portion 430 corresponds to the drive gear. In this case, the drive gear can only drive the first gear 300 to rotate, but cannot drive the second gear 400 to rotate.

[0064] This design makes the printer more compact and its control more flexible, enabling it to meet the needs of different printing tasks. At the same time, the use of a mechanical clutch reduces the complexity of electrical control and improves the system's reliability and durability.

[0065] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0066] Furthermore, the use of terms such as "first," "second," and "a" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

Claims

1. A transmission mechanism, characterized in that, include: A first shaft and a second shaft are coaxially arranged, the first shaft and the second shaft are connected by a connecting structure, and a first gear and a second gear are respectively provided on the first shaft and the second shaft; Along the axial direction of the first shaft, the first gear includes a first end face and a second end face, and the second gear includes a third end face and a fourth end face. The first end face, the second end face, the third end face and the fourth end face are arranged sequentially. A portion of the second end face protrudes to form a first friction part, and the first friction part abuts against the third end face.

2. The transmission mechanism according to claim 1, characterized in that, The first friction part is an arc-shaped protrusion, and the first friction part is arranged around the circumference of the first shaft.

3. The transmission mechanism according to claim 1, characterized in that, The first friction part includes a plurality of dot-shaped protrusions, which are spaced apart in the circumferential and / or radial direction of the first shaft.

4. The transmission mechanism according to any one of claims 1-3, characterized in that, The third end face protrusion forms a second friction part that abuts against the first friction part, and the structure of the first friction part is the same as the structure of the second friction part.

5. The transmission mechanism according to claim 1, characterized in that, The connection structure includes a slot and a buckle. The slot passes through the first end face and the second end face, and the buckle is disposed on the third end face. The buckle passes through the slot and engages with the first end face.

6. The transmission mechanism according to claim 5, characterized in that, In the circumferential direction of the first shaft, the slot includes a first slot wall and a second slot wall located at both ends, the buckle is movably disposed between the first slot wall and the second slot wall, and the buckle can abut against the first slot wall or the second slot wall.

7. The transmission mechanism according to claim 1, characterized in that, The transmission mechanism further includes an elastic element, which is connected to the first gear and the second gear respectively. The elastic element is in an elastic deformation state and has a tendency to push the second shaft to rotate relative to the first shaft.

8. The transmission mechanism according to claim 7, characterized in that, The first end face is provided with a first connecting part and an arc-shaped groove, and the third end face is provided with a second connecting part. The second connecting part protrudes from the first end face through the arc-shaped groove, and the two ends of the elastic member are respectively connected to the first connecting part and the second connecting part. The elastic element is in an elastic deformation state and has a tendency to push the first gear and the second gear closer to each other.

9. A clutch, characterized in that, The device includes a drive gear and a transmission mechanism according to any one of claims 1-8, wherein the first gear has a first under-tooth portion, the second gear has a second under-tooth portion, and both the first under-tooth portion and the second under-tooth portion are used to accommodate the drive gear.

10. A printer, characterized in that, The clutch according to claim 9 includes loads connected to the first shaft and / or the second shaft, respectively.

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