阅读说明：本技术 一种离合器及打印机 (Clutch and printer ) 是由 张兴民 于 2020-05-12 设计创作，主要内容包括：本发明提供一种离合器及打印机,包括：同轴设置的第一轴件和第二轴件,第一轴件与第二轴件通过连接组件连接,第一轴件与第二轴件上分别设有第一齿轮和第二齿轮；欠齿部,设于第一齿轮以及第二齿轮上,欠齿部用于容纳驱动齿轮,第一齿轮具有使驱动齿轮在欠齿部内空转的第一位置,以及与驱动齿轮啮合的第二位置。本方案通过在齿轮上设置能够容纳驱动齿轮的欠齿部,使驱动齿轮在欠齿部内发生空转。当第一齿轮发生转动时,欠齿部与驱动齿轮错开,使驱动齿轮与第一齿轮相互啮合。由于本方案利用齿轮的欠齿部结构实现离合,对于产品的加工精度要求相对较低,极大程度的降低了离合器的制造成本,从而降低了打印机的制造成本。(The invention provides a clutch and a printer, comprising: the first shaft piece and the second shaft piece are coaxially arranged, the first shaft piece and the second shaft piece are connected through a connecting component, and a first gear and a second gear are respectively arranged on the first shaft piece and the second shaft piece; and a partial tooth portion provided on the first gear and the second gear, the partial tooth portion accommodating the drive gear, the first gear having a first position where the drive gear idles in the partial tooth portion, and a second position where the first gear meshes with the drive gear. This scheme makes drive gear take place the idle running in owing to set up the tooth portion of oweing that can hold drive gear on the gear. When the first gear rotates, the partial tooth part is staggered with the driving gear, so that the driving gear is meshed with the first gear. Because this scheme utilizes the not tooth portion structure of owe of gear to realize the separation and reunion, the machining precision requirement to the product is lower relatively, very big degree the manufacturing cost of clutch to the manufacturing cost of printer has been reduced.)

1. A clutch, comprising:

the gear transmission mechanism comprises a first shaft element (1) and a second shaft element (2) which are coaxially arranged, wherein the first shaft element (1) is connected with the second shaft element (2) through a connecting assembly, and a first gear (4) and a second gear (5) are respectively arranged on the first shaft element (1) and the second shaft element (1);

and a partially toothed portion (6) provided on the first gear (4) and the second gear (5), the partially toothed portion (6) accommodating a drive gear (7), the first gear having a first position at which the drive gear idles in the partially toothed portion (6) and a second position at which the drive gear meshes with the drive gear (7).

2. The clutch of claim 1, wherein the coupling assembly comprises:

locate respectively first axle spare (1) and/or spacing portion (8) and joint portion on second axle spare (2), spacing portion (8) with the joint portion is in relative motion takes place in the first direction of motion of first axle spare (1), first direction of motion is first gear by first position to drive the direction that first axle spare (1) takes place to rotate during the motion of second position.

3. The clutch of claim 2, further comprising:

the elastic piece (12) is respectively connected with the first shaft piece (1) and the second shaft piece (2), and the elastic piece (12) is in an elastic deformation state and has a movement trend of pushing the first shaft piece (1) to move along the first movement direction.

4. The clutch of claim 3, further comprising:

a trigger part (22) arranged on the first shaft member (1);

and the switch (10) is arranged on a path of the trigger part (22) moving along the first movement direction along with the first shaft piece (1).

5. Clutch according to claim 4, wherein the trigger (22) is provided protruding towards the outside with respect to the first shaft (1).

6. Clutch according to any of claims 1 to 5, wherein the first gear wheel (4) and the second gear wheel (5) are arranged in parallel and wherein the first gear wheel (4) and the second gear wheel (5) are of the same shape.

7. Clutch according to claim 6, wherein the corresponding central angle of the under-teeth (6) is [30 °, 90 ° ].

8. The clutch according to any one of claims 1 to 5, wherein the first shaft member (1) is fitted over the second shaft member (2), the first shaft member (1) and the second shaft member (2) have an overlapping region in a length direction, and the connecting member is provided in the overlapping region.

9. A printer comprising a clutch according to any one of claims 1 to 7, wherein a load is connected to the first shaft member and/or the second shaft member, respectively.

Technical Field

The invention relates to the technical field of mechanical transmission structures, in particular to a clutch and a printer.

Background

The transmission between the roller and the shaft often requires a clutch. In some application scenarios, such as printers, there are more shafts and rollers inside. However, the printer internal space has a certain limitation, and the motor cannot be separately arranged for each shaft or roller. Therefore, some clutches need to be arranged inside the printer to relieve the problem of space tension.

As shown in fig. 1, the clutch of the conventional printer includes a first shaft member 1 and a second shaft member 2, and a first protrusion 11 and a second protrusion 21 are respectively protruded on the outer peripheries of the first shaft member 1 and the second shaft member 2.

Referring to fig. 2, the first shaft 1 and the second shaft 2 are both inserted into the cylinder 3. The inner surface of the cylinder 3 is respectively jointed with the outer surfaces of the first shaft member 1 and the second shaft member 2. Wherein, barrel 3 overcoat is equipped with square spring 31, and the both ends of square spring 31 are connected respectively on first axle spare 1 and second axle spare 2.

Referring to fig. 1 and 2, when the first protrusion 11 is touched, the first shaft 1 is passively rotated, so as to drive the square spring 31 to tighten, and the square spring 31 tightly embraces the outer wall of the cylinder 3, resulting in the cylinder 3 further clamping the outer walls of the first shaft 1 and the second shaft 2, so that the first shaft 1 and the second shaft 2 are integrated into a whole, and thus the rotation is synchronously performed.

When the second protrusion 21 is touched, the second shaft 2 passively rotates to drive the square spring 31 to be loosened, the square spring 31 does not tightly hold the outer wall of the cylinder 3 any more, the friction force between the first shaft 1 and the second shaft 2 and the inner wall of the cylinder 3 is reduced, the first shaft 1 and the second shaft 2 are not integrated any more, only the second shaft 2 rotates, and the first shaft 1 is in a free state.

However, since the operation of such a clutch is greatly affected by the dimensional accuracy and the surface roughness accuracy of the first shaft member 1, the second shaft member 2, and the cylinder 3, the production cost is relatively high.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the production cost is high due to high requirement on the processing precision of the clutch in the prior art, thereby providing the clutch and the printer.

A clutch, comprising:

the first shaft part and the second shaft part are coaxially arranged, the first shaft part and the second shaft part are connected through a connecting component, and a first gear and a second gear are respectively arranged on the first shaft part and the second shaft part;

and a less-toothed portion provided on the first gear and the second gear, the less-toothed portion accommodating the drive gear, the first gear having a first position at which the drive gear idles in the less-toothed portion, and a second position at which the first gear meshes with the drive gear.

The connecting assembly includes:

the limiting part and the combining part are arranged on the first shaft part and/or the second shaft part respectively, the limiting part and the combining part move relatively in a first movement direction of the first shaft part, and the first movement direction is a direction in which the first gear drives the first shaft part to rotate when moving from the first position to the second position.

Further comprising:

and the elastic piece is in an elastic deformation state and has a movement trend of pushing the first shaft piece to move along the first movement direction.

Further comprising:

the trigger part is arranged on the first shaft piece;

the switch is arranged on a path of the trigger part moving along the first movement direction along with the first shaft piece.

The trigger part is arranged in a protruding mode towards the outer side relative to the first shaft piece.

The first gear and the second gear are arranged in parallel, and the shapes of the first gear and the second gear are the same.

The central angle corresponding to the under-tooth part is [30 degrees, 90 degrees ].

The first shaft piece is sleeved on the second shaft piece, the first shaft piece and the second shaft piece are provided with an overlapping area in the length direction, and the connecting assembly is arranged in the overlapping area.

A printer comprises the clutch, wherein a load is connected to the first shaft element and/or the second shaft element respectively.

The technical scheme of the invention has the following advantages:

1. the present invention provides a clutch, including: the first shaft part and the second shaft part are coaxially arranged, the first shaft part and the second shaft part are connected through a connecting component, and a first gear and a second gear are respectively arranged on the first shaft part and the second shaft part; and a less-toothed portion provided on the first gear and the second gear, the less-toothed portion accommodating the drive gear, the first gear having a first position at which the drive gear idles in the less-toothed portion, and a second position at which the first gear meshes with the drive gear.

This scheme makes drive gear take place the idle running in owing to set up the tooth portion of oweing that can hold drive gear on the gear. When the first gear rotates, the tooth lacking part is staggered with the driving gear, so that the driving gear is meshed with the first gear, the driving gear drives the first gear to rotate, and the first gear drives the first shaft to move. So that the first shaft element drives the load or the first shaft element drives the second shaft element to drive the load to move. Because this scheme utilizes the not tooth portion structure of owe of gear to realize the separation and reunion, the machining precision requirement to the product is lower relatively, very big degree the manufacturing cost of clutch to the manufacturing cost of printer has been reduced.

2. The invention provides a clutch, wherein the connecting component comprises: the limiting part and the combining part are arranged on the first shaft part and/or the second shaft part respectively, the limiting part and the combining part move relatively in a first movement direction of the first shaft part, and the first movement direction is a direction in which the first gear drives the first shaft part to rotate when moving from the first position to the second position.

The limiting part and the combining part move relatively along with the rotation of the first shaft piece. When the limiting part is abutted and combined with the combining part, the limiting part and the combining part form a whole, so that the first shaft part and the second shaft part are combined into a whole in the first movement direction, and the first shaft part drives the second shaft part to move.

3. The clutch provided by the invention further comprises: and the elastic piece is in an elastic deformation state and has a movement trend of pushing the first shaft piece to move along the first movement direction.

In the scheme, the second shaft part is connected with the load, and the elasticity of the elastic part in a deformation state is not enough to push the second shaft part to drive the load to rotate. When the external force limiting the first shaft element is removed, the first shaft element is in a free state and is controlled by the elastic force of the elastic element to rotate, so that the first gear rotates to the second position, and the first gear and the driving gear are meshed for transmission.

4. The clutch provided by the invention further comprises: the trigger part is arranged on the first shaft piece; the switch is arranged on a path of the trigger part moving along the first movement direction along with the first shaft piece.

The trigger part and the switch are mutually matched, and the switch supports and prevents the trigger part from moving along the first movement direction, so that the first shaft member is prevented from moving, and the first gear is kept at the first position. When the switch is removed, the trigger part loses support and is controlled by the elastic piece to move along the first movement direction, so that the first gear is meshed with the driving gear. The first shaft piece further rotates and is combined with the second shaft piece into a whole through the connecting assembly, so that the second shaft piece is driven to rotate, and then the load connected to the second shaft piece is driven to rotate.

5. In the clutch provided by the invention, the trigger part is arranged in a protruding mode relative to the first shaft part in an outward direction.

The trigger part arranged convexly sweeps an annular path when rotating along with the first shaft part. And resetting the switch again after the switch is removed from the annular path. When the trigger part rotates for one circle and collides with the switch again, the driving gear is just positioned in the under-tooth part of the first gear. At the moment, the first gear returns to the first position and stops rotating. The second gear is still in a state of meshing with the drive gear, and the drive gear continues to rotate, so that the fitting portion of the second gear is also aligned with the drive gear. In the process, the second shaft part rotates relative to the first shaft part, so that the elastic part is elastically deformed and reset again. Meanwhile, the limiting part in the scheme is a limiting groove, so that the limiting part is limited in the first movement direction of the rotating shaft, and when the second shaft part rotates relative to the first shaft part, the first shaft part can be regarded as rotating opposite to the first movement direction relative to the second shaft part. The two ends of the limiting groove are provided with groove walls, when the under-tooth part of the second gear just faces the driving gear, the other groove wall of the limiting groove just abuts against the combining part, and therefore the second gear also stops rotating to achieve resetting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a prior art clutch configuration;

FIG. 2 is a cross-sectional view of a prior art clutch configuration;

FIG. 3 is a schematic illustration of the clutch configuration of the present invention;

fig. 4 is an exploded view of the internal structure of the clutch of the present invention.

Description of reference numerals:

1. a first shaft member; 11. a first protrusion; 12. an elastic member; 2. a second shaft member; 21. a second protrusion; 22. a trigger section; 3. a barrel; 31. a square spring; 4. a first gear; 5. a second gear; 6. a tooth part is missed; 7. a drive gear; 8. a limiting part; 10. and (4) switching.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.