CN113531002A - Rotary control tightness clutch - Google Patents

Abstract

A clutch capable of controlling tightness in a rotating mode comprises a clutch fixing chassis, a clutch main body, a clutch claw piece, a clutch output shaft and a knob, wherein the clutch main body is fixedly installed on the clutch fixing chassis, an upper cavity and a lower cavity which are communicated up and down are formed in the clutch main body, and gear teeth are arranged on the inner side wall of the upper cavity; the clutch claw piece is arranged in the upper cavity and comprises a claw seat positioned in the center and a plurality of elastic arms arranged on the periphery of the claw seat, and a pawl is arranged at one end, far away from the claw seat, of each elastic arm towards the gear teeth; the lower end of the clutch output shaft is arranged in the lower cavity, and the upper end of the clutch output shaft is connected with the clutch claw sheet into a whole, so that the clutch output shaft rotates along with the clutch claw sheet; the knob is rotatably covered on the upper end of the clutch body, and a driving part and an unlocking part are arranged on the lower surface of the knob. The invention can rapidly adjust the tightness of the rope by the forward or reverse rotation knob, and has simple structure and convenient use.

Description

Rotary control tightness clutch

Technical Field

The invention relates to the technical field of daily supplies, in particular to a rotation control tightness clutch.

Background

In daily life, fastening by a tether is a common way of fastening for footwear, medical protectors or other articles of daily use. Taking shoes as an example, when using sports shoes or canvas shoes, the common shoelace is threaded through the lace holes on the shoes and then fastened with bowknots or other fasteners, and during the sports, the shoelace is easy to loosen, and is inconvenient if the shoelace is loosened when people walk on the road or carry a lot of articles; particularly in sports, the shoelace is easily loosened and is subject to accidents.

At present, a few daily necessities on the market have lacing tightening devices, but the lacing tightening devices are complex in structure, tiny in accessories and numerous in number, so that the manufacturing process is complex and rapid assembly cannot be realized; high manufacturing cost, weak structural stability, high rejection rate and poor use effect. In the middle of the use, utilize to break off locking mechanism by force, the operability is complicated, and after tightening up the rope, the mechanism can only pull up and throw off, and the in-process of slack rope and tightrope can not be in succession, can not finely tune the elasticity degree of rope. Due to the problems of complexity and space of a mechanical structure, the parts are small and are very easy to crack, so that the safety problems of sudden loosening of the rope, twisting of the rope or mechanism spalling and the like are caused.

Disclosure of Invention

In view of the above disadvantages, an object of the present invention is to provide a rotation-controlled slack clutch, which solves the problems of complex structure and unstable structure of a tying device, and can be quickly tied and easily fine-tuned when being mounted on a wearable article, thereby providing a convenient use.

The embodiment of the invention provides a clutch capable of controlling tightness in a rotating mode, which comprises a clutch fixing chassis, a clutch main body, a clutch claw piece, a clutch output shaft and a knob, wherein the clutch fixing chassis is provided with a plurality of clutch grooves;

the clutch main body is fixedly arranged on the clutch fixing chassis, an upper cavity and a lower cavity which are communicated up and down are formed in the clutch main body, and gear teeth are arranged on the inner side wall of the upper cavity;

the clutch claw piece is arranged in the upper cavity and comprises a claw seat positioned in the center and a plurality of elastic arms arranged on the periphery of the claw seat, and a pawl is arranged at one end, far away from the claw seat, of each elastic arm towards the gear teeth;

the lower end of the clutch output shaft is arranged in the lower cavity, and the upper end of the clutch output shaft is connected with the clutch claw sheet into a whole, so that the clutch output shaft rotates along with the clutch claw sheet;

the knob can be rotationally covered on the upper end of the clutch body, and a driving part and an unlocking part are arranged on the lower surface of the knob; wherein:

when the knob rotates forwards, the knob pushes the clutch claw piece to rotate through the driving part, the clutch claw piece drives the clutch output shaft to rotate together, each elastic arm is opened outwards, and the pawl and the gear teeth are in a meshed state;

when the knob rotates reversely, the knob applies acting force to each elastic arm through the unlocking part to enable each elastic arm to contract inwards, the pawl and the gear teeth are in a disengaged state, and the clutch output shaft can rotate freely.

Furthermore, the elastic arm is connected with the claw seat at a certain angle, and a clamping part which is convenient for the driving part to push the clutch claw piece to rotate is formed between the inner side surface of the elastic arm and the outer peripheral surface of the claw seat.

Further, the cross-sectional shape of the pawl is wedge-shaped, and the shape of the pawl is matched with the shape of the gear teeth, so that the pawl and the gear teeth are engaged unidirectionally.

Further, a partition plate is disposed between the upper cavity and the lower cavity in the clutch body.

Furthermore, the upper end of the clutch output shaft is provided with a connecting part, and the connecting part penetrates through the middle part of the claw seat and is connected with the claw seat.

Furthermore, the connecting portion is a cross connecting shaft, a cross hole for the connecting portion to pass through is formed in the middle of the claw seat, and the cross connecting shaft is matched with the cross hole.

Furthermore, a positioning column extends downwards from the center of the circle of the lower surface of the knob and penetrates through the middle of the connecting part.

Furthermore, a buckle is arranged downwards on the periphery of the knob and clamped on the outer periphery of the upper end of the clutch main body.

Further, the unlocking part is located on the periphery of the driving part and is a protruding block protruding from the lower surface of the knob, and the protruding block applies extrusion force to the elastic arm to enable the elastic arm to contract inwards, so that the engagement state or the disengagement state of the pawl and the gear teeth is switched.

Furthermore, the outer side wall of the elastic arm is provided with a flange, and the inner side wall of the unlocking part is provided with a clamping groove matched with the flange.

Further, the driving portion and the unlocking portion are offset from each other by a predetermined distance in the circumferential direction of the knob.

Further, the unlocking part is an arc-shaped groove formed on the lower surface of the knob in a concave mode; the elastic arm correspondingly extends towards the arc-shaped groove to form a protruding block, the protruding block is embedded into the arc-shaped groove and slides in the arc-shaped groove, and the arc-shaped groove is distributed to the outer periphery from a position close to the circle center of the knob to guide the elastic arm to deform so that the pawl and the gear teeth form an engaged state or a disengaged state.

Furthermore, a rope bin is arranged at the lower end of the clutch output shaft along the circumferential direction, and a rope is wound on the outer side wall of the rope bin; the lateral wall in rope storehouse has seted up the wire casing, the inside chamber that holds that has of rope storehouse.

Further, the clutch fixing chassis comprises a bottom plate and a cylindrical part arranged on the bottom plate, wherein a semi-open space is formed by the bottom plate and the cylindrical part, and the clutch main body is placed in the semi-open space.

Further, the number of the elastic arms is two or three, the number of the driving portions is the same as that of the elastic arms, and the number of the unlocking portions is the same as that of the elastic arms.

Further, the rotation control slack clutch is used on the shoe and used for adjusting the tightness of the shoe rope.

The rotation control loosening and tightening clutch provided by the embodiment can be switched between a rope tightening state and a rope loosening state through the forward rotation knob or the reverse rotation knob, and when the knob rotates forwards, the clutch claw sheet and the gear teeth are in a meshing state, so that the output shaft of the clutch is controlled to rotate forwards to establish the rope tightening state; when the knob rotates reversely, the clutch claw sheet is disengaged from the gear teeth, so that the clutch output shaft can rotate freely to establish a rope loosening state; the invention has simple structure and convenient assembly, can quickly adjust the tightness of the rope by the forward or reverse rotation knob and is convenient to use.

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 only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is an exploded view of a first embodiment of a rotary control slack clutch in accordance with the present invention.

FIG. 2 is a front view of a first embodiment of a rotationally controlled takeup clutch in accordance with the present invention.

FIG. 3 is a cross-sectional view A-A of the rotation control slack clutch of FIG. 2.

Fig. 4 is a perspective view of the clutch body of fig. 1.

FIG. 5 is a perspective view of the clutch plate of FIG. 1.

Fig. 6 is a perspective view of the clutch output shaft of fig. 1.

Fig. 7 is a front view of fig. 6.

Fig. 8 is an internal structural view of the output shaft of the clutch of fig. 6.

Fig. 9 is a schematic view of the lower surface of the knob of fig. 1.

FIG. 10 is a schematic view of the engagement of the knob and the clutch plate in the taut condition according to the first embodiment of the present invention.

FIG. 11 is a schematic view of the engagement between the knob and the clutch plate in the slack state according to the first embodiment of the present invention.

Fig. 12 is a perspective view of a knob in a second embodiment of the present invention.

FIG. 13 is a top plan view of the clutch plate of the second embodiment of the present invention.

FIG. 14 is a schematic diagram of the engagement of the knob and the clutch plate in the taut condition according to the second embodiment of the present invention.

FIG. 15 is a schematic view of the engagement of the knob and the clutch plate in the slack state according to the second embodiment of the present invention.

In the figure, 10-clutch fixed chassis, 11-bottom plate, 12-cylindrical part, 20-clutch body, 21-gear teeth, 22-rope hole, 23-separation plate, 30-clutch claw piece, 31-claw seat, 311-clamping part, 32-elastic arm, 321-lug, 33-pawl, 34-flange, 35-cross hole, 40-clutch output shaft, 401-connecting part, 41-rope bin, 411-wire groove, 50-knob, 501-positioning column, 502-buckle, 51-driving part, 52-unlocking part, 521-clamping groove, 60-rope and 61-knot.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

[ first embodiment ]

Referring to fig. 1 to 3, in an embodiment of the present invention, a rotation control slack clutch includes a clutch fixing chassis 10, a clutch body 20, clutch pawls 30, a clutch output shaft 40, and a knob 50.

Specifically, the clutch fixing chassis 10 includes a bottom plate 11 and a cylindrical portion 12 disposed on the bottom plate 11, the bottom plate 11 and the cylindrical portion 12 form a half-open space, and the diameter of the clutch body 20 is slightly smaller than the diameter of the cylindrical portion 12, so that the lower end of the clutch body 20 is placed in the half-open space and clamped to the clutch fixing chassis 10, and the fixed connection between the clutch body 20 and the clutch fixing chassis 10 is ensured. The clutch mounting plate 10 is disposed at the bottom of the rotation control slack clutch, and the periphery of the base plate 11 is used for sewing on a wearable article such as a shoe. Preferably, the clutch fixing chassis 10 is made of synthetic fiber materials, can be directly sewn, does not need to be additionally sewn by other materials, and is simple and quick to fix. Of course, other materials can be selected according to actual use conditions, and the material of the clutch fixing chassis 10 is not limited in the invention.

Referring to fig. 4, the clutch body 20 is fixedly mounted on the clutch fixing chassis 10, and specifically, the clutch body 20 may be fixedly mounted on the clutch fixing chassis 10 by a snap or other method. The clutch body 20 has an upper cavity and a lower cavity communicating with each other in the upper and lower directions, and the inner side wall of the upper cavity is uniformly provided with gear teeth 21 along the circumferential direction of the clutch body 20. Specifically, to prevent the displacement of the components in the upper and lower cavities during use, a partition plate 23 is provided in the clutch body 20 between the upper and lower cavities to ensure the stability of the rotation control slack clutch.

The side wall of the clutch body 20 is provided with two rope holes 22. The cord holes 22 may be provided at any position of the side walls. In the present embodiment, two rope holes 22 are respectively provided at the bottom of the side wall of the clutch body 20. In actual use, the rope 60 has two ends, and the two ends of the rope 60 respectively penetrate into the rope holes 22 and enter into the lower cavity of the clutch body 20.

Referring to fig. 5, a clutch plate 30 is disposed in the upper cavity of the clutch body 20, the clutch plate 30 includes a centrally located dog seat 31 and a plurality of elastic arms 32 disposed at the periphery of the dog seat 31, and each elastic arm 32 is provided with a pawl 33 at an end away from the dog seat 31 toward the gear teeth 21. Specifically, in order to ensure the rope winding function in the tightened state, the rotation control slack clutch can only rotate in the forward direction and not in the reverse direction when the pawl 33 is engaged with the gear teeth 21, and can only rotate in the reverse direction when the pawl 33 is disengaged from the gear teeth 21. Specifically, the cross-sectional shape of the pawl 33 of the clutch plate 30 is wedge-shaped, that is, the pawl 33 is triangular with a bias, and the shape of the pawl 33 matches the shape of the gear teeth 21, so that the pawl 33 is unidirectionally engaged with the gear teeth 21 to maintain the rope tightening state.

In this embodiment, three elastic arms 32 are uniformly arranged on the periphery of the claw seat 31, and a space is reserved for the deformation of the elastic arms 32. In the actual use process, the number of the elastic arms 32 can be adjusted according to the actual situation, for example, two elastic arms 32 are provided.

Referring to fig. 6 to 8, the lower end of the clutch output shaft 40 is disposed in the lower cavity of the clutch body 20, and the upper end of the clutch output shaft 40 is integrally connected to the clutch plate 30, so that the clutch output shaft 40 rotates together with the clutch plate 30. Specifically, the upper end of the clutch output shaft 40 is provided with a connecting portion 401, the connecting portion 401 passes through the middle of the pawl seat 31, and the connecting portion 401 extends upward to a height not exceeding the height of the upper cavity in the clutch body 20. In this embodiment, the connecting portion 401 is a cross-shaped connecting shaft, the middle portion of the pawl seat 31 is provided with a cross-shaped hole 35 for the connecting portion 401 to pass through, and the cross-shaped connecting shaft is matched with the cross-shaped hole 35, so that the upper end of the clutch output shaft 40 and the clutch pawl 30 are connected into a whole. In other embodiments, the upper end of the clutch output shaft 40 can be integrated with the clutch plate 30 in other manners.

Specifically, the lower end of the clutch output shaft 40 is provided with a rope bin 41 along the circumferential direction, and the rope is wound on the outer side wall of the rope bin 41. When the clutch output shaft 40 rotates along with the clutch pawl 30, the rope bin 41 is driven to rotate together, so that the purposes of rope winding and rope unwinding are achieved. More specifically, the side wall of the rope bin 41 is provided with a wire slot 411, and the inside of the rope bin 41 is provided with an accommodating cavity. Preferably, the sidewall of the rope bin 41 is opened with two wire slots 411. In the in-process of in-service use, rope 60 has end to end both ends, and after two rope holes 22 entered into rope storehouse 41 respectively at the end to end both ends of rope 60, two wire casings 411 were passed respectively to end both ends again and the intracavity that holds that enters into rope storehouse 41 inside, and end to end both ends are tied into knot 61 for rope 60 forms the closed loop, when rope storehouse 41 corotation, makes rope 60 twine in rope storehouse 41 lateral wall.

The knob 50 is rotatably covered on the upper end of the clutch body 20. Specifically, a positioning column 501 extends downwards from the center of the lower surface of the knob 50, and the positioning column 501 passes through the middle of the connecting portion 401. Specifically, a hole (not shown) for the positioning column 501 to pass through is formed in the middle of the connecting portion 401, so that the positioning column 501 of the knob 50 can be positioned and assembled conveniently. Preferably, the positioning column 501 is a cylindrical column. Of course, the positioning column 501 may have other shapes, such as a triangular prism, a quadrangular prism, and the like.

More specifically, the periphery of the knob 50 is provided with a downward buckle 502, and the buckle 502 is clamped on the periphery of the upper end of the clutch body 20, so as to facilitate the quick assembly of the rotation control loose clutch and prevent the knob 50 from falling off.

Referring to fig. 9, a driving portion 51 and an unlocking portion 52 are provided on a lower surface of the knob 50; wherein:

when the knob 50 rotates forwards, the knob 50 pushes the clutch claw 30 to rotate through the driving part 51, the clutch claw 30 drives the clutch output shaft 40 to rotate together to establish a rope tightening state, and at the moment, each elastic arm 32 is opened outwards and the pawl 33 is meshed with the gear teeth 21, as shown in fig. 10;

when the knob 50 is reversed, the knob 50 applies a force to each of the elastic arms 32 through the unlocking portion 52 to contract each of the elastic arms 32 inward, so that the pawls 33 are disengaged from the gear teeth 21, and the clutch output shaft 40 can rotate freely to establish a slack state, as shown in fig. 11.

For convenience of explanation, in the present embodiment, the clockwise rotation direction is defined as normal rotation, and the counterclockwise rotation direction is defined as reverse rotation.

Referring to fig. 5, one end of each elastic arm 32 near the claw seat 31 is connected to the claw seat 31 at a certain angle, and a locking portion 311 is formed between the inner side surface of the elastic arm 32 and the outer peripheral surface of the claw seat 31 for facilitating the driving portion 51 to push the clutch claw 30 to rotate. The end of each resilient arm 32 remote from the pawl seat 31 is provided with a pawl 33 towards the gear teeth 21. The elastic arm 32 is deformed by an external force, thereby switching the engagement state or the disengagement state between the pawl 33 and the gear teeth 21.

Referring to fig. 9 to 11, the driving portions 51 may be fixture blocks with any shape, the number of the driving portions 51 is the same as the number of the elastic arms 32, in this embodiment, the number of the driving portions 51 is three, and the three driving portions 51 are located on the same circle. Since the driving portion 51 is fixed on the lower surface of the knob 50, when the user rotates the knob 50 forward, the driving portion 51 is driven to rotate, and when the driving portion 51 is engaged with the positioning portion 311, the user continues to rotate the knob 50 forward, so as to push the clutch pawl 30 forward.

In the present embodiment, the unlocking portion 52 is located on the periphery of the driving portion 51, i.e., the distance from the center of the knob 50 to the driving portion 51 is smaller than the distance from the center of the knob 50 to the unlocking portion 52, and the unlocking portion 52 is a latch protruding from the lower surface of the knob 50. Similarly, the number of the unlocking portions 52 is the same as the number of the elastic arms 32, and in the present embodiment, the number of the unlocking portions 52 is three, and the three unlocking portions 52 are located on the same other circle. The outer side wall of each elastic arm 32 is provided with a flange 34 (see fig. 5), and the inner side wall of each unlocking portion 52 is provided with a clamping groove 521 matched with the flange 34. Preferably, the cross section of the locking groove 521 is circular arc shape, so that the flange 34 can be conveniently locked and released. Since the unlocking portion 52 is fixed on the lower surface of the knob 50, the user rotates the unlocking portion 52 when the knob 50 is turned reversely. During the reverse rotation, the driving portion 51 moves in a direction away from the catching portion 311, and the unlocking portion 52 applies a pressing force to the resilient arms 32, causing the resilient arms 32 to contract inward, thereby disengaging the pawls 33 from the gear teeth 21. When the unlocking part 52 is rotated to the nearest flange 34, the catching groove 521 catches the flange 34. The elastic arm 32 has an outward elastic force, so that the engaging groove 521 and the flange 34 do not fall off, thereby driving the clutch pawl 30 to rotate reversely.

Specifically, referring to fig. 9, the driving portion 51 and the unlocking portion 52 are not on the same straight line along the radial direction, that is, the driving portion 51 and the unlocking portion 52 are offset from each other by a certain distance in the circumferential direction of the knob 50. When the knob 50 is rotated in the forward direction, the driving portion 51 is engaged with the engaging portion 311 and drives the clutch plate 30 to rotate in the forward direction, and the pawl 33 is engaged with the gear 21 due to the outward tension of the elastic arm 32. When the user disengages knob 50 and stops turning, pawl 33 remains engaged with gear teeth 21, establishing a tight cord condition and cord 60 does not come loose. When the knob 50 is reversed, the elastic arms 32 are contracted inward by the pressing action of the unlocking portion 52, so that the pawls 33 are disengaged from the gear teeth 21, and the clutch output shaft 40 can be freely rotated to establish a slack state, and the cord 60 can be loosened.

[ second embodiment ]

Referring to fig. 12 and fig. 13, the difference between the present embodiment and the previous embodiment is: each unlocking portion 52 is an arc-shaped groove concavely formed on the lower surface of the knob 50; each elastic arm 32 is correspondingly provided with a convex block 321 extending towards the arc-shaped groove, the convex block 321 is embedded into the arc-shaped groove and slides in the arc-shaped groove, the arc-shaped groove is diffused towards the outer periphery from a position close to the center of the knob 50, namely, the distance between any position of the arc-shaped groove and the gear teeth 21 is different, so that the elastic arms 32 are guided to deform, and the pawl 33 and the gear teeth 21 are in an engaged state or a disengaged state.

Referring to fig. 14, in the present embodiment, the lower surface of the knob 50 is provided with a driving portion 51, the driving portion 51 may be a latch with any shape, since the driving portion 51 is fixed on the lower surface of the knob 50, when the user rotates the knob 50 forward, the driving portion 51 is driven to rotate, and when the driving portion 51 is latched to the latching portion 311, the user continues to rotate the knob 50 forward, and the clutch pawl 30 is driven to rotate forward. At this point, the projection 321 is closest to the gear teeth 21 within the arcuate recess, causing the pawl 33 on the spring arm 32 to engage the gear teeth 21, thereby placing the rotary control slack clutch in a taut condition.

Referring to fig. 15, the user rotates the knob 50 in the reverse direction, and during the reverse rotation, the driving portion 51 moves in the direction away from the engaging portion 311, and meanwhile, the protrusion 321 slides in the arc groove and gradually moves away from the gear teeth 21, so that the pawl 33 is disengaged from the gear teeth 21, at this time, the rotation control slack clutch is in a slack state, and when the user rotates in the reverse direction and pulls the rope 60, the rope 60 can be pulled out.

In the above embodiments, the rotation control take-up clutch is used on wearable articles that require a tether, such as footwear, medical protectors, and the like. Preferably, a rotation controlled slack clutch is used on the shoe for adjusting the slack of the shoe cord.

In other embodiments, because different users are used to different hands, the clockwise rotation direction may be reverse rotation, the counterclockwise rotation direction is forward rotation, the knob 50 establishes the tight rope state through forward rotation, and the reverse rotation establishes the slack rope state.

In the description of the present invention, it is to be understood that the terms "center", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the 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.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (16)

1. A rotary control tightness clutch is characterized by comprising a clutch fixing chassis (10), a clutch main body (20), a clutch claw sheet (30), a clutch output shaft (40) and a knob (50);

the clutch main body (20) is fixedly arranged on the clutch fixing chassis (10), an upper cavity and a lower cavity which are communicated up and down are formed in the clutch main body (20), and gear teeth (21) are arranged on the inner side wall of the upper cavity;

the clutch claw sheet (30) is arranged in the upper cavity, the clutch claw sheet (30) comprises a claw seat (31) positioned in the center and a plurality of elastic arms (32) arranged on the periphery of the claw seat (31), and one end, away from the claw seat (31), of each elastic arm (32) is provided with a pawl (33) towards the gear teeth (21);

the lower end of the clutch output shaft (40) is arranged in the lower cavity, and the upper end of the clutch output shaft (40) is connected with the clutch claw sheet (30) into a whole, so that the clutch output shaft (40) rotates along with the clutch claw sheet (30);

the knob (50) can be rotatably covered on the upper end of the clutch body (20), and a driving part (51) and an unlocking part (52) are arranged on the lower surface of the knob (50); wherein:

when the knob (50) rotates forwards, the knob (50) pushes the clutch claw sheet (30) to rotate through the driving part (51), the clutch claw sheet (30) drives the clutch output shaft (40) to rotate together, each elastic arm (32) is opened outwards, and the pawl (33) and the gear teeth (21) are in a meshed state;

when the knob (50) rotates reversely, the knob (50) applies acting force to each elastic arm (32) through the unlocking part (52) to enable each elastic arm (32) to contract inwards, the pawl (33) is in a disengaged state with the gear teeth (21), and the clutch output shaft (40) can rotate freely.

2. The rotationally controlled slack clutch of claim 1, characterized in that the spring arm (32) is angularly connected to the pawl receptacle (31), and a detent (311) is formed between an inner surface of the spring arm (32) and an outer circumferential surface of the pawl receptacle (31) for facilitating rotation of the clutch pawl (30) by the driving portion (51).

3. A rotationally controlled takeup clutch according to claim 1, wherein the cross-sectional shape of the pawl (33) is wedge-shaped, the pawl (33) being shaped to match the shape of the gear teeth (21) such that the pawl (33) makes unidirectional engagement with the gear teeth (21).

4. A rotationally controlled slack clutch as claimed in claim 1, characterized in that a divider plate (23) is provided within said clutch body (20) between said upper and lower cavities.

5. A rotary control slack clutch as claimed in claim 1, characterized in that the clutch output shaft (40) is provided at its upper end with a connecting portion (401), said connecting portion (401) passing through the middle of said dog seat (31) and being connected to said dog seat (31).

6. The rotationally controlled slack clutch of claim 5, characterized in that the connecting portion (401) is a cross connecting shaft, a cross hole (35) for the connecting portion (401) to pass through is formed in the middle of the pawl seat (31), and the cross connecting shaft is matched with the cross hole (35).

7. The rotationally controlled slack clutch of claim 5, wherein a positioning post (501) extends downwardly from a center of a lower surface of the knob (50), the positioning post (501) passing through a middle portion of the connecting portion (401).

8. The rotationally controlled slack clutch of claim 1, wherein a catch (502) is provided downwardly on a periphery of said knob (50), said catch (502) being engaged with an outer periphery of an upper end of said clutch body (20).

9. The rotationally controlled takeup clutch according to claim 1, wherein the unlocking portion (52) is located on the periphery of the drive portion (51), and the unlocking portion (52) is a projection projecting from a lower surface of the knob (50), and the projection applies a pressing force to the resilient arm (32) to cause the resilient arm (32) to contract inward, thereby switching the engaged state or the disengaged state between the pawl (33) and the gear teeth (21).

10. The rotationally controlled slack clutch of claim 9, characterized in that an outer side wall of the spring arm (32) is provided with a flange (34) and an inner side wall of the unlocking portion (52) is provided with a catch (521) that mates with the flange (34).

11. The rotationally controlled takeup clutch according to claim 9, wherein the drive portion (51) and the unlocking portion (52) are offset from each other by a distance in a circumferential direction of the knob (50).

12. The rotationally controlled slack clutch of claim 1, wherein the unlocking portion (52) is an arcuate groove concavely formed in a lower surface of the knob (50); elastic arm (32) correspond towards arc recess extends there is lug (321), lug (321) embedding in the arc recess and in the arc recess slides, the arc recess is followed and is close to the position department of the centre of a circle of knob (50) distributes to the periphery to the guide elastic arm (32) take place deformation, so that pawl (33) with teeth of a cogwheel (21) form the engaged state or break away from the state.

13. The rotationally controlled slack clutch of claim 1, wherein a lower end of the clutch output shaft (40) is provided with a rope storage (41) along a circumferential direction, and a tether is wound around an outer side wall of the rope storage (41); a wire casing (411) is formed in the side wall of the rope bin (41), and an accommodating cavity is formed in the rope bin (41).

14. The rotationally controlled slack clutch of claim 1, characterized in that the clutch stationary chassis (10) includes a base plate (11) and a cylindrical portion (12) disposed on the base plate (11), the base plate (11) and the cylindrical portion (12) forming a semi-open space for the clutch body (20) to be placed in.

15. The rotationally controlled slack clutch of claim 1, characterized in that the number of the spring arms (32) is two or three, the drive portions (51) are provided in the same number as the number of the spring arms (32), and the unlocking portions (52) are provided in the same number as the number of the spring arms (32).

16. A rotary control slack clutch according to any one of claims 1 to 15, wherein the rotary control slack clutch is used on a shoe for adjusting the slack of a shoe cord.

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