Sewing machine back-stitching switch

Abstract

The utility model discloses a sewing machine back-stitching switch which comprises a handle and an elastic piece, the handle is movably installed on a machine shell of a sewing machine, the handle is connected with a reversing shaft, the elastic piece is installed on the handle and can move along with the handle, a first clamping portion is arranged on the elastic piece, and a second clamping portion is arranged on the machine shell. When the handle is located at the first position, the cloth feeding swing frame keeps feeding cloth forwards, when the handle is located at the second position, the first clamping part and the second clamping part are clamped so that the cloth feeding swing frame keeps not feeding cloth, when the handle is located at the third position, the cloth feeding swing frame keeps feeding cloth backwards, and the second position is arranged between the first position and the third position. The cloth feeding swing frame has three cloth feeding states, namely, a forward cloth feeding state, a non-cloth feeding state and a backward cloth feeding state, and an operator can push and pull the cloth manually in the non-cloth feeding state, so that manual sewing is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and particularly relates to a reverse sewing switch of a sewing machine. Background Art

[0002] A sewing machine is a mechanical device for sewing clothes. A machine shell is arranged on the sewing machine, and a cloth feeding swing frame, a driving shaft, a reversing shaft and a reverse sewing switch are arranged on the machine shell. The driving shaft is used to drive the cloth feeding swing frame to move so that the cloth feeding swing frame realizes the cloth feeding function. The reverse sewing switch is used to drive the reversing shaft to rotate so that the reversing shaft adjusts the cloth feeding direction of the cloth feeding swing frame. One end of the reversing shaft is provided with an arc-shaped guide groove, and a guide post extending into the arc-shaped guide groove is arranged on the cloth feeding swing frame. When the reverse sewing switch drives the reversing shaft to rotate in different directions and the arc-shaped guide groove is in different positions, different cloth feeding directions of the cloth feeding swing frame can be realized.

[0003] In actual use, when the reverse sewing switch is in the first position, the cloth feeding swing frame keeps feeding the cloth forward. When the reverse sewing switch is in the second position, the cloth feeding swing frame keeps feeding the cloth backward. Since the traditional reverse sewing switch can only stay in the first position or the second position, the cloth feeding swing frame has only two states of feeding the cloth forward and feeding the cloth backward, resulting in that the operator cannot manually push and pull the cloth for manual sewing (such as DIY embroidery). Content of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the utility model provides a reverse sewing switch of a sewing machine, which can realize three cloth feeding states of the cloth feeding swing frame, namely feeding the cloth forward, not feeding the cloth, and feeding the cloth backward. In the non-cloth-feeding state, the operator can manually push and pull the cloth for manual sewing.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A reverse sewing switch of a sewing machine is used to drive the reversing shaft on the sewing machine to rotate so that the reversing shaft adjusts the cloth feeding direction of the cloth feeding swing frame on the sewing machine. The reverse sewing switch of the sewing machine includes a handle and an elastic member. The handle is movably installed on the machine shell of the sewing machine. The handle is connected to the reversing shaft. The elastic member is installed on the handle. The elastic member can move along with the handle. A first clamping portion is arranged on the elastic member, and a second clamping portion is arranged on the machine shell.

[0007] When the handle is in the first position, the cloth feeding swing frame keeps feeding the cloth forward.

[0008] When the handle is in the second position, the first clamping portion is clamped with the second clamping portion so that the cloth feeding swing frame keeps not feeding the cloth.

[0009] When the handle is in the third position, the cloth feeding swing frame keeps feeding the cloth backward.

[0010] Among them, the second position is arranged between the first position and the third position.

[0011] By providing a reverse sewing switch of a sewing machine composed of a handle and an elastic member, the handle is movably installed on the housing of the sewing machine, the handle is connected to a reversing shaft, the elastic member is installed on the handle, a first clamping portion is provided on the elastic member, and a second clamping portion is provided on the housing. When the handle is in the first position, the feed swing frame keeps feeding forward; when the handle is in the second position, the first clamping portion is clamped with the second clamping portion so that the feed swing frame keeps not feeding; when the handle is in the third position, the feed swing frame keeps feeding backward; thus realizing three feeding states of the feed swing frame, namely feeding forward, not feeding, and feeding backward. In the non-feeding state, the operator can manually push and pull the fabric for manual sewing (such as DIY embroidery).

[0012] As a preferred solution, the handle is movably installed on the housing in the up-and-down direction, and the first position, the second position, and the third position are arranged at intervals in the up-and-down direction.

[0013] As a preferred solution, the first clamping portion is a convex portion, and the second clamping portion is a concave portion.

[0014] As a preferred solution, the convex portion is an arc-shaped convex portion, and the arc-shaped convex portion has an arc surface protruding toward the second clamping portion.

[0015] As a preferred solution, a spring piece extending in the up-and-down direction is provided on the elastic member, the first clamping portion is arranged on the spring piece, and the spring piece can be elastically bent and deformed in the left-and-right direction.

[0016] As a preferred solution, a third clamping portion is provided above the second clamping portion. When the handle is in the first position, the first clamping portion is clamped with the third clamping portion.

[0017] As a preferred solution, an eccentric wheel is rotatably provided on the handle, a first swing arm is provided on the eccentric wheel, a limiting groove extending in the up-and-down direction is provided on the housing, and one end of the first swing arm extends into the limiting groove. When the handle is in the third position, the eccentric wheel pushes against the spring piece to elastically deform the spring piece in a direction away from the second clamping portion. When the handle is in the first position, the eccentric wheel releases the pushing against the spring piece to elastically deform the spring piece in a direction close to the second clamping portion.

[0018] As a preferred solution, a first reset member is provided on the housing to always make the handle tend to move upward.

[0019] As a preferred solution, the reversing shaft is provided with a second swing arm, and a second reset member is provided between the reversing shaft and the machine housing. The second reset member always makes the reversing shaft tend to rotate clockwise. The handle abuts against the second swing arm, and the handle can drive the second swing arm to rotate counterclockwise downward, so that the second swing arm drives the reversing shaft to rotate counterclockwise.

[0020] As a preferred solution, an identifier for identifying that the handle is in the second position is provided on the outer surface of the machine housing near the handle.

[0021] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, by providing a sewing machine reverse sewing switch composed of a handle and an elastic member, the handle is movably installed on the machine housing of the sewing machine, the handle is connected to the reversing shaft, the elastic member is installed on the handle, a first clamping portion is provided on the elastic member, and a second clamping portion is provided on the machine housing. When the handle is in the first position, the feeding swing frame keeps feeding forward; when the handle is in the second position, the first clamping portion is clamped with the second clamping portion, so that the feeding swing frame keeps not feeding; when the handle is in the third position, the feeding swing frame keeps feeding backward; thereby realizing three feeding states of the feeding swing frame, namely feeding forward, not feeding, and feeding backward. In the non-feeding state, the operator can manually push and pull the fabric for manual sewing (such as DIY embroidery).

[0022] To more clearly illustrate the structural features, technical means, and the specific purposes and functions achieved by the utility model, the following further details the utility model with reference to the accompanying drawings and specific embodiments: Description of the Drawings

[0023] Figure 1 is an assembly schematic diagram of the sewing machine reverse sewing switch, machine housing, reversing shaft, and feeding swing frame of the embodiment of the utility model;

[0024] Figure 2 is Figure 1 another perspective assembly schematic diagram;

[0025] Figure 3 is a structural schematic diagram of the sewing machine reverse sewing switch of the embodiment of the utility model;

[0026] Figure 4 is an exploded schematic diagram of the sewing machine reverse sewing switch of the embodiment of the utility model;

[0027] Figure 5 is a schematic diagram of the state of the handle in the first position of the embodiment of the utility model;

[0028] Figure 6 is a schematic diagram of the state of the handle in the second position of the embodiment of the utility model;

[0029] Figure 7 Schematic diagram of the handle of the embodiment of the present utility model in the third position state.

[0030] Explanation of the attached drawing reference numerals:

[0031] 10 - Sewing machine reverse sewing switch; 11 - Handle; 12 - Elastic member; 121 - First clamping portion; 1211 - Arc surface; 122 - Elastic sheet; 13 - First reset member; 14 - Eccentric wheel; 141 - First swing arm; 20 - Reversing shaft; 21 - Arc-shaped guide groove; 22 - Second reset member; 23 - Second swing arm; 24 - Circular connecting rod; 30 - Feed swing frame; 31 - Feed dog frame; 32 - Driving shaft; 40 - Machine housing; 41 - Second clamping portion; 42 - Third clamping portion; 43 - Limit groove; 431 - Inner bottom wall; 432 - Inner top wall. Detailed implementation manners

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] As Figure 2 shown, for the convenience of description and understanding, Figure 2 the label M in

[0035] As Figures 1-7As shown, the utility model discloses a sewing machine return stitch switch 10, which is used to drive a reversing shaft 20 on the sewing machine to rotate so that the reversing shaft 20 adjusts the cloth feeding direction of a cloth feeding swing frame 30 on the sewing machine, one end of the reversing shaft 20 is provided with an arc guide groove 21, the cloth feeding swing frame 30 is provided with a guide column (not shown), one end of the guide column is movably arranged in the arc guide groove 21, the cloth feeding swing frame 30 is transmission-connected with a cloth feeding tooth frame 31, and the sewing machine is also provided with a driving shaft 32 for driving the cloth feeding swing frame 30 to move, wherein the reversing shaft 20, the arc guide groove 21, the guide column, the cloth feeding swing frame 30, the cloth feeding tooth frame 31, and the driving shaft 32 are all existing mature technologies, and therefore are not described in detail.

[0036] The sewing machine return-sewing switch 10 includes a handle 11 and an elastic member 12. The handle 11 is movably mounted on the housing 40 of the sewing machine. The handle 11 is connected to the reversing shaft 20. The elastic member 12 is mounted on the handle 11. The elastic member 12 can move with the handle 11. A first clamping portion 121 is provided on the elastic member 12, and a second clamping portion 41 is provided on the housing 40.

[0037] When the handle 11 is in the first position, the cloth feeding swing frame 30 keeps feeding the cloth forward.

[0038] When the handle 11 is at the second position, the first clamping portion 121 is clamped with the second clamping portion 41 so that the cloth feeding swing frame 30 remains without feeding cloth.

[0039] When the handle 11 is at the third position, the cloth feeding swing frame 30 keeps feeding the cloth backwards.

[0040] Wherein, the second position is set between the first position and the third position.

[0041] The handle 11 is movably mounted on the housing 40, and the first position, the second position and the third position are spaced apart in the vertical direction. By arranging the handle 11 movably mounted on the housing 40, the movement of the handle 11 is simple and easy to operate.

[0042] The first clamping portion 121 is a convex portion, and the second clamping portion 41 is a concave portion.

[0043] The convex portion is an arc-shaped convex portion, and the arc-shaped convex portion has an arc-shaped surface 1211 protruding toward the second clamping portion 41, and the concave portion is an arc-shaped concave portion; by adopting the arc-shaped convex portion, the arc-shaped convex portion has an arc-shaped surface 1211 protruding toward the second clamping portion 41, and utilizing the guiding effect of the arc-shaped surface 1211, the arc-shaped convex portion can be smoothly clamped into or withdrawn from the second clamping portion 41, thereby making the cloth feeding swing frame 30 switch the cloth feeding direction more smoothly.

[0044] A shrapnel 122 extending in the vertical direction is provided on the elastic member 12, and the first clamping portion 121 is provided on the shrapnel 122. The shrapnel 122 can be elastically bent and deformed in the left-right direction. By providing the shrapnel 122 extending in the vertical direction and arranging the first clamping portion 121 on the shrapnel 122, the shrapnel 122 has a certain strength in the vertical direction. When the push handle 11 moves from the second position to the third position, a certain force is required to disengage the first clamping portion 121 from the second clamping portion 41, making the clamping between the first clamping portion 121 and the second clamping portion 41 more stable, thereby improving the stability of the cloth feeding swing frame 30 to maintain non-cloth feeding.

[0045] A third clamping portion 42 is provided above the second clamping portion 41. When the handle 11 is in the first position, the first clamping portion 121 is clamped with the third clamping portion 42, and the third clamping portion 42 has the same structure as the second clamping portion 41. By providing the third clamping portion 42 and clamping the first clamping portion 121 with the third clamping portion 42, the cloth feeding swing frame 30 is kept stable for forward cloth feeding.

[0046] An eccentric wheel 14 is rotatably provided on the handle 11. The rotation axis of the eccentric wheel 14 extends in the front-rear direction. A first swing arm 141 is provided on the eccentric wheel 14. A limiting groove 43 extending in the vertical direction is provided on the machine housing 40. One end of the first swing arm 141 extends into the limiting groove 43. When the handle 11 is in the third position, the eccentric wheel 14 pushes against the shrapnel 122 to elastically deform the shrapnel 122 in a direction away from the second clamping portion 41. When the handle 11 is in the first position, the eccentric wheel 14 releases the push on the shrapnel 122 to elastically deform the shrapnel 122 in a direction close to the second clamping portion 41. By providing the eccentric wheel 14, the swing arm, and the limiting groove 43, when the first swing arm 141 abuts against the inner bottom wall 431 of the limiting groove 43, the first swing arm 141 drives the eccentric wheel 14 to rotate counterclockwise, and the eccentric wheel 14 pushes the shrapnel 122 to the left, causing the shrapnel 122 to drive the first clamping portion 121 to elastically deform away from the second clamping portion 41. After releasing the handle 11, the first reset member 13 drives the handle 11 to move upward. The handle 11 drives the elastic member 12 and the eccentric wheel 14 to move upward. When the first swing arm 141 abuts against the inner top wall 432 of the limiting groove 43, the first swing arm 141 drives the eccentric wheel 14 to rotate clockwise, and the eccentric wheel 14 releases the push on the shrapnel 122 until the first clamping portion 121 moves upward and is clamped into the second clamping portion 41, and then the handle 11 stops moving upward. Thus, when the handle 11 moves from the third position to the first position, the first clamping portion 121 is non-contact with the machine housing 40, preventing bumping, and further making the movement of the handle 11 smoother.

[0047] A first reset member 13 is provided on the housing 40 to always give the handle 11 a tendency to move upward. Specifically, the first reset member 13 is a tension spring. The upper end of the tension spring is connected to the housing 40, and the lower end of the tension spring is connected to the handle 11. It can be understood that the same effect can be achieved by replacing the tension spring with a compression spring.

[0048] At the other end of the reversing shaft 20, a second swing arm 23 that can rotate with the reversing shaft 20 is provided. A second reset member 22 is provided between the reversing shaft 20 and the housing 40. The second reset member 22 always gives the reversing shaft 20 a tendency to rotate clockwise about its own axis. The lower surface of the handle 11 abuts against the upper surface of the second swing arm 23. The handle 11 can drive the second swing arm 23 to rotate counterclockwise downward, so that the second swing arm 23 drives the reversing shaft 20 to rotate counterclockwise. Specifically, the second reset member 22 is a torsion spring sleeved outside the reversing shaft 20. The second reset member 22 can also be replaced by other structures with a reset function. Among them, the torsion spring is a prior art.

[0049] The extended end of the second swing arm 23 is provided with a circular connecting rod 24. The axis of the circular connecting rod 24 is parallel to the axis of the reversing shaft 20. The lower surface of the handle 11 abuts against the upper surface of the circular connecting rod 24. By adopting the circular connecting rod 24, when the handle 11 pushes the circular connecting rod 24 to move, the circular connecting rod 24 can keep in contact with the handle 11, so that the handle 11 drives the reversing shaft 20 to rotate more stably.

[0050] A mark (not shown) for identifying that the handle 11 is in the second position is provided on the outer surface of the housing 40 near the handle 11. Specifically, the mark is a number silk-screened on the outer surface of the housing 40, such as "0". The mark can also be a structure protruding / concaving on the outer surface of the housing 40. By providing a mark for identifying that the handle 11 is in the second position on the outer surface of the housing 40 near the handle 11, it helps the operator to operate correctly according to the indication and improves the efficiency.

[0051] It should be noted that the handle 11 can also be installed on the housing 40 in a rotating manner. When the handle 11 is rotated, the handle 11 can drive the elastic member 12 to move between the first position, the second position and the third position. At this time, the first position, the second position and the third position are arc-shaped distributions.

[0052] It should be noted that the positions of the convex part and the concave part can be interchanged, that is, the first clamping part 121 is set as the concave part, and the second clamping part 41 is correspondingly set as the convex part.

[0053] The working principle of the present utility model:

[0054] In the initial state, the handle 11 is in the first position, the first engaging portion 121 is engaged with the third engaging portion 42, and under the drive of the drive shaft 32, the cloth feeding swing frame 30 keeps feeding the cloth forward;

[0055] The operator presses the handle 11 downward, the elastic member 12 moves downward following the handle 11, causing the first engaging portion 121 to move downward and engage into the second engaging portion 41. The handle 11 presses the circular connecting rod 24 to move downward, and the circular connecting rod 24 drives the second swing arm 23 to rotate counterclockwise downward. The second swing arm 23 drives the reversing shaft 20 and the arc-shaped guide groove 21 to rotate counterclockwise. The arc-shaped guide groove 21 adjusts the position of the cloth feeding swing frame 30 through the guide post, so that the cloth feeding swing frame 30 stops feeding the cloth;

[0056] The operator continues to press the handle 11 downward and keeps it stationary. The elastic member 12 continues to move downward following the handle 11. The second engaging portion 41 disengages from the second engaging portion 41 and moves downward. The arc-shaped guide groove 21 continues to adjust the position of the cloth feeding swing frame 30 through the guide post, so that the cloth feeding swing frame 30 keeps feeding the cloth backward;

[0057] When the first swing arm 141 abuts against the inner bottom wall 431 of the limiting groove 43, the first swing arm 141 drives the eccentric wheel 14 to rotate counterclockwise. The eccentric wheel 14 pushes the elastic piece 122 to the left, causing the elastic piece 122 to drive the first engaging portion 121 to elastically deform away from the second engaging portion 41. After releasing the handle 11, the first reset member 13 drives the handle 11 to move upward. The handle 11 drives the elastic member 12 and the eccentric wheel 14 to move upward. When the first swing arm 141 abuts against the inner top wall 432 of the limiting groove 43, the first swing arm 141 drives the eccentric wheel 14 to rotate clockwise. The eccentric wheel 14 releases the push on the elastic piece 122 until the first engaging portion 121 moves upward and engages into the second engaging portion 41, then the handle 11 stops moving upward.

[0058] In summary, the present utility model realizes a sewing machine backstitch switch 10 composed of a handle 11 and an elastic member 12. The handle 11 is movably installed on the machine shell 40 of the sewing machine. The handle 11 is connected to the reversing shaft 20. The elastic member 12 is installed on the handle 11. The elastic member 12 is provided with a first engaging portion 121. The machine shell 40 is provided with a second engaging portion 41. When the handle 11 is in the first position, the cloth feeding swing frame 30 keeps feeding the cloth forward; when the handle 11 is in the second position, the first engaging portion 121 is engaged with the second engaging portion 41, so that the cloth feeding swing frame 30 stops feeding the cloth; when the handle 11 is in the third position, the cloth feeding swing frame 30 keeps feeding the cloth backward; thus, the cloth feeding swing frame 30 realizes three cloth feeding states: feeding the cloth forward, not feeding the cloth, and feeding the cloth backward. In the non-cloth-feeding state, the operator can manually push and pull the cloth for manual sewing (such as DIY embroidery).

[0059] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Therefore, any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the actual technology of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A sewing machine reversing switch, used to drive the reversing shaft on the sewing machine to rotate so that the reversing shaft adjusts the cloth feeding direction of the cloth feeding swing frame on the sewing machine, characterized in that: The sewing machine return stitch switch comprises a handle and an elastic member, wherein the handle is movably mounted on the housing of the sewing machine, the handle is connected to the reversing shaft, the elastic member is mounted on the handle, the elastic member can move with the handle, the elastic member is provided with a first clamping portion, and the housing is provided with a second clamping portion; When the handle is in the first position, the cloth feeding swing frame keeps feeding the cloth forward; When the handle is in the second position, the first clamping portion is clamped with the second clamping portion, so that the cloth feeding swing frame remains without feeding cloth; When the handle is in the third position, the cloth feeding swing frame keeps feeding the cloth backwards; Wherein, the second position is set between the first position and the third position.

2. The sewing machine return stitch switch according to claim 1, characterized in that: The handle is movably mounted on the housing up and down, and the first position, the second position and the third position are arranged at intervals along the up and down directions.

3. The sewing machine return stitch switch according to claim 1, characterized in that: The first clamping portion is a convex portion, and the second clamping portion is a concave portion.

4. The sewing machine return stitch switch according to claim 3, characterized in that: The convex portion is an arc-shaped convex portion, and the arc-shaped convex portion has an arc-shaped surface convex toward the second clamping portion.

5. The sewing machine return stitch switch according to claim 1, characterized in that: The elastic member is provided with an elastic sheet extending in the up-down direction, the first clamping portion is provided on the elastic sheet, and the elastic sheet can be elastically bent and deformed in the left-right direction.

6. The sewing machine return stitch switch according to claim 1, characterized in that: A third clamping portion is provided above the second clamping portion, and when the handle is in the first position, the first clamping portion is clamped with the third clamping portion.

7. The sewing machine return stitch switch according to claim 6, characterized in that: An eccentric wheel is rotatably provided on the handle, and a first swing arm is provided on the eccentric wheel. A limiting groove extending in the up-down direction is provided on the casing, and one end of the first swing arm extends into the limiting groove. When the handle is in the third position, the eccentric wheel pushes the spring sheet to make the spring sheet elastically deform in the direction away from the second clamping portion. When the handle is in the first position, the eccentric wheel releases the push on the spring sheet to make the spring sheet elastically deform in the direction close to the second clamping portion.

8. The sewing machine return stitch switch according to claim 1, characterized in that: The housing is provided with a first restoring member which enables the handle to always have a tendency to move upward.

9. The sewing machine return stitch switch according to claim 1, characterized in that: The reversing shaft is provided with a second swing arm, and a second reset member is provided between the reversing shaft and the casing. The second reset member enables the reversing shaft to always have a tendency to rotate clockwise. The handle abuts against the second swing arm, and the handle can drive the second swing arm to rotate counterclockwise downward, so that the second swing arm drives the reversing shaft to rotate counterclockwise.

10. The sewing machine backstitch switch according to any one of claims 1 to 9, characterized in that: A mark for identifying that the handle is in the second position is provided on the outer surface of the housing near the handle.

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