Cloth feeding synchronous adjusting clutch of sewing machine

Abstract

The utility model discloses a sewing machine cloth feeding synchronous adjusting clutch which comprises a rotating shaft, a synchronous belt wheel and a movable gear, the synchronous belt wheel and the movable gear are installed on the rotating shaft, the synchronous belt wheel comprises a belt wheel body and a supporting housing arranged on the front end face of the belt wheel body, belt wheel teeth are arranged on the outer wall of the belt wheel body, and inner teeth are arranged on the inner wall of the belt wheel body. The movable gear comprises a gear body and a cylindrical base arranged on the front end face of the gear body, and outer teeth matched with the inner teeth are arranged on the outer wall of the gear body. The clutch can be installed on an upper shaft or a lower shaft of the sewing machine, when the adjusting needle is matched with the feed dog, the clutch is firstly adjusted to be in a synchronous state, the lower shaft rotates to adjust the position of the feed dog, then the movable gear is pulled out till the movable gear is completely separated from the synchronous belt wheel, and the upper shaft only drives the movable gear to rotate independently. And the height of the needle rod can be independently adjusted to be matched with the feed dog.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a cloth feeding synchronous regulating clutch for sewing machines. Background Art

[0002] At present, sewing machines are equipped with a cloth feeding mechanism, which is used to drive the cloth feeding dog to do a compound motion of up and down reciprocating motion and front and back reciprocating motion to realize cloth feeding, and cooperate with the up and down reciprocating motion of the needle to complete the sewing operation. The needle is driven by the upper shaft to move up and down, and the cloth feeding dog is driven by the lower shaft to do a compound motion of up and down and front and back. When the sewing machine is running, the upper shaft and the lower shaft are connected by the synchronous wheel to make the needle and the cloth feeding dog move in coordination.

[0003] During the production and assembly of the sewing machine, it is necessary to adjust the timing of the needle and the feed dog. Generally, the position of the feed dog is adjusted first, and then the height of the needle bar is adjusted separately to make the two match. When adjusting the height of the needle bar separately, it is necessary to release the synchronization between the upper shaft and the lower shaft. Some existing technologies set gears at the synchronization wheel. When it is necessary to release the synchronization, the gear meshing is forcibly broken so that the lower shaft will not be linked when the upper shaft rotates. After adjusting the cooperation between the needle and the feed dog, the gear meshing is restored. Although this adjustment method can also achieve the synchronization release of the upper shaft and the lower shaft, the way of forcibly breaking the gear meshing is inevitably rough and inconvenient, and improper operation may damage the gear.

[0004] Therefore, it is necessary to develop a cloth feeding synchronous adjustment clutch to easily complete the synchronous transmission and transmission release of the upper shaft and the lower shaft. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a synchronous adjustment clutch for feeding cloth of a sewing machine.

[0006] According to the first aspect of the utility model, the cloth feeding synchronous adjustment clutch of the sewing machine comprises a rotating shaft, a synchronous belt wheel and a movable gear mounted on the rotating shaft, the synchronous belt wheel comprises a belt wheel body and a support cover shell arranged on the front end surface of the belt wheel body, the outer wall of the belt wheel body is provided with belt wheel teeth, and the inner wall is provided with internal teeth, the support cover shell is a shell structure surrounded by an end cover and an outer peripheral wall, and the interior thereof is a cavity, the end cover is provided with a through hole for installing the rotating shaft, the synchronous belt wheel is rotatably connected with the rotating shaft through the through hole, the movable gear comprises a gear body and a cylindrical base arranged on the front end surface of the gear body, the outer wall of the gear body is provided with external teeth matching with the internal teeth, the outer circumferential diameter of the cylindrical base is smaller than the root circle diameter of the external teeth and the cylindrical base can extend into the cavity, the movable gear is slidably connected with the rotating shaft, and the movable gear can be inserted into the synchronous belt wheel through the matching of the internal teeth and the external teeth, and the rotating shaft is the upper shaft or the lower shaft of the sewing machine.

[0007] The cloth feeding synchronous adjustment clutch of the sewing machine according to the embodiment of the utility model has at least the following beneficial effects:

[0008] The clutch of the utility model can be installed on the upper shaft or the lower shaft of the sewing machine to replace the existing synchronous wheel. Under normal working conditions, the movable gear is inserted into the synchronous belt wheel. When installed on the upper shaft, the motor drives the upper shaft to rotate, and the upper shaft drives the movable gear to rotate. The movable gear drives the synchronous belt wheel to rotate through the engagement of the outer teeth and the inner teeth, thereby realizing the synchronous rotation of the upper shaft and the lower shaft. When adjusting the cooperation between the needle and the feed dog, first adjust the clutch to the synchronous state, rotate the lower shaft to adjust the position of the feed dog, and then pull out the movable gear until the outer teeth and the inner teeth are completely separated, release the synchronous state, the upper shaft only drives the movable gear to rotate alone, and the synchronous belt wheel is in a static state, and the needle bar height can be adjusted alone to make it cooperate with the feed dog. The clutch can easily complete the synchronous transmission and transmission release of the upper shaft and the lower shaft.

[0009] According to some embodiments of the utility model, the inner wall of the wheel body of the movable gear is provided with a keyway for axial sliding, the keyway extends from the gear body to the cylindrical base but does not penetrate the front end surface of the cylindrical base, and the rotating shaft is provided with a convex key that matches the keyway. The sliding key connection method ensures that the movable gear can both rotate with the shaft and slide axially.

[0010] According to some embodiments of the utility model, the bottom of the keyway is close to the front end face of the cylindrical base, and when the movable gear moves until the convex key abuts against the bottom of the keyway, the inner teeth and the outer teeth are completely disengaged. The bottom of the keyway is close to the front end face of the cylindrical base, so that the movable gear has enough movement distance without disengaging the movable gear from the convex key.

[0011] According to some embodiments of the utility model, there are two keyways, which are symmetrically arranged with respect to the axis of the movable gear. The two symmetrical keyways can improve the transmission accuracy and stability.

[0012] According to some embodiments of the utility model, a spring is sleeved on the rotating shaft, a first retaining spring is provided on the rotating shaft, the spring is located between the first retaining spring and the movable gear, one end of the spring abuts against the rear end face of the movable gear, and the other end of the spring abuts against the first retaining spring. The spring applies a weak thrust to the movable gear to prevent the movable gear from falling out of the synchronous pulley during rotation, and at the same time has a limiting effect to prevent the synchronous pulley and the movable gear from being displaced as a whole in a synchronous state.

[0013] According to some embodiments of the utility model, a second retaining spring is provided on the rotating shaft, and the second retaining spring abuts against the end cover. The second retaining spring is used to limit the position of the synchronous belt pulley and prevent the synchronous belt pulley from axial movement.

[0014] According to some embodiments of the utility model, a first retaining ring is provided on the rear end face of the movable gear, and the outer diameter of the first retaining ring is larger than the tooth top circle diameter of the pulley teeth. The first retaining ring facilitates the movable gear to be pulled out or pushed in from the synchronous pulley.

[0015] According to some embodiments of the utility model, the support cover is a cylindrical shell, which has the advantages of uniform force, simple processing, less wear, and convenient installation and disassembly.

[0016] According to some embodiments of the utility model, the outer wall diameter of the support cover is smaller than the root circle diameter of the pulley teeth. Designing the cross-sectional area of ​​the support cover to be smaller than the cross-sectional area of ​​the pulley body can save part space and reduce manufacturing costs.

[0017] According to some embodiments of the utility model, the junction between the support cover and the pulley body is convex outward along the circumferential direction to form a second retaining ring, and the outer diameter of the second retaining ring is larger than the tooth top circle diameter of the pulley teeth. When separating the movable gear and the synchronous pulley, the second retaining ring can be pressed with fingers to facilitate the separation of the movable gear.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a cross-sectional view of the synchronous pulley and the movable gear of the utility model in a synchronous state;

[0022] Figure 3 It is a cross-sectional view of the utility model in a disengaged state between the synchronous pulley and the movable gear.

[0023] Figure numerals: rotating shaft 100, synchronous pulley 200, pulley body 210, pulley teeth 211, internal teeth 212, support cover 220, end cover 221, outer peripheral wall 222, cavity 223, second retaining ring 230, movable gear 300, gear body 310, external teeth 311, cylindrical base 320, keyway 330, cam 340, first retaining ring 350, spring 400, first retaining spring 500, second retaining spring 600. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] Reference Figure 1-3 A cloth feeding synchronous adjustment clutch for a sewing machine comprises a rotating shaft 100, a synchronous pulley 200 and a movable gear 300 mounted on the rotating shaft 100, the synchronous pulley 200 comprises a pulley body 210 and a support cover 220 arranged on the front end surface of the pulley body 210, the outer wall of the pulley body 210 is provided with pulley teeth 211, and the inner wall is provided with inner teeth 212, the support cover 220 is a shell structure surrounded by an end cover 221 and an outer peripheral wall 222, the interior of which is a cavity 223, the end cover 221 is provided with a through hole for mounting the rotating shaft 100, the synchronous pulley 200 is rotatably connected with the rotating shaft 100 through the through hole, and the movable gear 300 comprises a gear body 310 and a cylindrical base 320 arranged on the front end surface of the gear body 310, the outer wall of the gear body 310 is provided with external teeth 311 cooperating with the internal teeth 212, the outer circumferential diameter of the cylindrical base 320 is smaller than the root circle diameter of the external teeth 311 and the cylindrical base 320 can extend into the cavity 223, the movable gear 300 is slidably connected with the rotating shaft 100, the movable gear 300 can be inserted into the synchronous pulley 200 through the cooperation of the internal teeth 212 and the external teeth 311, the rotating shaft 100 is the upper shaft or the lower shaft of the sewing machine, the pulley body 210 and the support cover 220 are integrally formed, and the gear body 310 and the cylindrical base 320 are integrally formed.

[0026] Working principle: The clutch can be installed on the upper shaft or lower shaft of the sewing machine to replace the existing synchronous wheel. Under normal working conditions, the movable gear 300 is inserted into the synchronous belt wheel 200 (such as Figure 2 When installed on the upper shaft, the motor drives the upper shaft to rotate, and the upper shaft drives the movable gear 300 to rotate. The movable gear 300 drives the synchronous pulley 200 to rotate through the engagement of the outer teeth 311 and the inner teeth 212, thereby realizing the synchronous rotation of the upper shaft and the lower shaft. When adjusting the coordination between the needle and the feed dog, first adjust the clutch to the synchronous state, rotate the lower shaft to adjust the position of the feed dog, and then pull out the movable gear 300 until the outer teeth 311 and the inner teeth 212 are completely disengaged (as shown in FIG. Figure 3 As shown), the synchronization state is released, the upper shaft only drives the movable gear 300 to rotate alone, and the synchronous pulley 200 is in a stationary state, and the needle bar height can be adjusted alone to make it match the feed dog.

[0027] In some of the embodiments, a key slot 330 for axial sliding is provided on the inner wall of the wheel body of the movable gear 300, and the key slot 330 extends from the gear body 310 to the cylindrical base 320 but does not penetrate the front end surface of the cylindrical base 320, and a convex key 340 is provided on the rotating shaft 100 to match the key slot 330. The sliding key connection ensures that the movable gear 300 can both rotate with the shaft and slide along the axial direction.

[0028] In some embodiments, the bottom of the keyway 330 is close to the front end surface of the cylindrical base 320, and when the movable gear 300 moves to the point where the convex key 340 abuts against the bottom of the keyway, the inner teeth 212 and the outer teeth 311 are completely separated. The bottom of the keyway is close to the front end surface of the cylindrical base 320, so that the movable gear 300 has a sufficient moving distance without separating the movable gear 300 from the convex key 340.

[0029] In some embodiments, there are two key slots 330, which are symmetrically arranged about the axis of the movable gear 300. The two symmetrical key slots 330 can improve the transmission accuracy and stability.

[0030] In some embodiments, a spring 400 is sleeved on the rotating shaft 100, a first retaining spring 500 is provided on the rotating shaft 100, the spring 400 is located between the first retaining spring 500 and the movable gear 300, one end of the spring 400 abuts against the rear end surface of the movable gear 300, and the other end of the spring 400 abuts against the first retaining spring 500. The spring 400 applies a weak thrust to the movable gear 300 to prevent the movable gear 300 from escaping from the synchronous pulley 200 during rotation, and also has a limiting effect to prevent the synchronous pulley 200 and the movable gear 300 from being displaced as a whole in a synchronous state.

[0031] In some embodiments, a second retaining spring 600 is disposed on the rotating shaft 100, and the second retaining spring 600 abuts against the end cover 221. The second retaining spring 600 is used to limit the position of the synchronous pulley 200 and prevent the synchronous pulley 200 from axial movement.

[0032] In some embodiments, a first retaining ring 350 is provided on the rear end surface of the movable gear 300, and the outer diameter of the first retaining ring 350 is larger than the diameter of the tooth top circle of the pulley teeth 211. The first retaining ring 350 facilitates the movable gear 300 to be pulled out or pushed in from the synchronous pulley 200. The first retaining ring 350 and the movable gear 300 are integrally formed.

[0033] In some embodiments, the support housing 220 is a cylindrical housing, which has the advantages of uniform force, simple processing, less wear, and convenient installation and disassembly.

[0034] In some embodiments, the outer wall diameter of the support housing 220 is smaller than the root diameter of the pulley teeth 211. Designing the cross-sectional area of ​​the support housing 220 to be smaller than the cross-sectional area of ​​the pulley body 210 can save component space and reduce manufacturing costs.

[0035] In some embodiments, the junction of the support housing 220 and the pulley body 210 is convexly formed along the circumferential direction to form a second retaining ring 230, and the outer diameter of the second retaining ring 230 is larger than the diameter of the tooth top circle of the pulley teeth 211. When separating the movable gear 300 and the synchronous pulley 200, the second retaining ring 230 can be pressed with a finger to facilitate the separation of the movable gear 300. The second retaining ring 230 and the synchronous pulley 200 are integrally formed.

[0036] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A synchronous adjustment clutch for feeding cloth of a sewing machine, characterized in that: The invention comprises a rotating shaft (100), a synchronous pulley (200) and a movable gear (300) mounted on the rotating shaft (100), wherein the synchronous pulley (200) comprises a pulley body (210) and a support cover (220) arranged on the front end surface of the pulley body (210), the outer wall of the pulley body (210) is provided with pulley teeth (211), and the inner wall is provided with internal teeth (212), the support cover (220) is a shell structure surrounded by an end cover (221) and an outer peripheral wall (222), the interior of the support cover (220) is a cavity (223), the end cover (221) is provided with a through hole for mounting the rotating shaft (100), the synchronous pulley (200) is rotatably connected to the rotating shaft (100) through the through hole, and the movable gear (300) is provided with ... and a support cover (220) arranged on the front end surface of the pulley body (210), The gear (300) comprises a gear body (310) and a cylindrical base (320) arranged on the front end surface of the gear body (310); the outer wall of the gear body (310) is provided with external teeth (311) matched with the internal teeth (212); the outer diameter of the cylindrical base (320) is smaller than the root diameter of the external teeth (311) and the cylindrical base (320) can extend into the cavity (223); the movable gear (300) is slidably connected to the rotating shaft (100); the movable gear (300) can be inserted into the synchronous pulley (200) through the matching of the internal teeth (212) and the external teeth (311); the rotating shaft (100) is the upper shaft or the lower shaft of the sewing machine.

2. The synchronous adjustment clutch for feeding cloth of a sewing machine according to claim 1, characterized in that: The inner wall of the wheel body of the movable gear (300) is provided with a keyway (330) for axial sliding, and the keyway (330) extends from the gear body (310) to the cylindrical base (320) but does not penetrate the front end surface of the cylindrical base (320), and the rotating shaft (100) is provided with a convex key (340) that matches the keyway (330).

3. The cloth feeding synchronous adjustment clutch for a sewing machine according to claim 2, characterized in that: The bottom of the keyway (330) is close to the front end surface of the cylindrical base (320), and when the movable gear (300) moves until the convex key (340) abuts against the bottom of the keyway, the inner teeth (212) and the outer teeth (311) are completely disengaged.

4. The cloth feeding synchronous adjustment clutch for a sewing machine according to claim 2, characterized in that: There are two keyways (330) which are symmetrically arranged about the axis of the movable gear (300).

5. The cloth feeding synchronous adjustment clutch for a sewing machine according to claim 1, characterized in that: A spring (400) is sleeved on the rotating shaft (100), and a first retaining spring (500) is provided on the rotating shaft (100). The spring (400) is located between the first retaining spring (500) and the movable gear (300). One end of the spring (400) abuts against the rear end surface of the movable gear (300), and the other end of the spring (400) abuts against the first retaining spring (500).

6. The cloth feeding synchronous adjustment clutch for a sewing machine according to claim 1, characterized in that: The rotating shaft (100) is provided with a second clamping spring (600), and the second clamping spring (600) is in contact with the end cover (221).

7. The synchronous adjustment clutch for feeding cloth of a sewing machine according to claim 1, characterized in that: A first retaining ring (350) is provided on the rear end surface of the movable gear (300), and the outer diameter of the first retaining ring (350) is greater than the tooth top circle diameter of the belt wheel teeth (211).

8. The synchronous adjustment clutch for feeding cloth of a sewing machine according to claim 1, characterized in that: The supporting cover shell (220) is a cylindrical shell.

9. The cloth feeding synchronous adjustment clutch for a sewing machine according to claim 8, characterized in that: The outer wall diameter of the support cover shell (220) is smaller than the root circle diameter of the pulley teeth (211).

10. The cloth feeding synchronous adjustment clutch for a sewing machine according to claim 9, characterized in that: The junction between the support cover shell (220) and the pulley body (210) is convex outwardly in the circumferential direction to form a second retaining ring (230), and the outer diameter of the second retaining ring (230) is greater than the tooth top circle diameter of the pulley teeth (211).

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