Backstitching handle for sewing machine

Abstract

The utility model provides a kind of sewing machine's backstitching wrench, belong to sewing machine technical field.It solves the problem of the existing backstitching wrench occupies larger external space.This sewing machine includes head, backstitching shaft is equipped in head, backstitching wrench includes first connecting rod and handle, the inner end of first connecting rod passes through the outer wall of head and is fixedly connected with backstitching shaft, the outer end of first connecting rod has first limit surface, the inner end of handle has second limit surface, the outer end of first connecting rod is hinged with the inner end of handle, handle is folded when being perpendicular to first connecting rod, so that handle is attached on the outer wall of head, when handle is unfolded relative to first connecting rod, so that first limit surface and second limit surface are attached, handle and first connecting rod are positioned.This sewing machine's backstitching wrench has the advantage that backstitching wrench occupies small space.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine rewinding wrench. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, interweaving or sewing together one or more layers of fabric. When performing reinforcement sewing on a sewing machine, the reverse stitch lever needs to be pressed down, which moves the fabric in the opposite direction. Releasing the reverse stitch lever moves the fabric in the forward direction. Repeating this process several times will reinforce the fabric several times.

[0003] Existing sewing machine backstitching wrenches, such as the sewing machine with a left-shifting backstitching wrench structure disclosed in Chinese patent literature [Patent No.: 201410221729.1; Application Publication No.: CN103993435B], include a sewing head, a backstitching wrench, a backfeed shaft, a backfeed crank assembly, a backfeed connecting rod, and a feed adjuster. The backstitching wrench is linked to the backfeed shaft, the backfeed crank assembly is fixed on the backfeed shaft, the backfeed crank assembly is linked to the backfeed connecting rod, and the backfeed connecting rod is linked to the feed adjuster. The sewing head column has a wrench movable cavity and a lubricating oil working cavity formed in the cavity, separated by a middle cavity wall, and distributed left and right. The outer end of the backstitching wrench is located on the left side of the front of the sewing head column, and the inner end of the backstitching wrench is located in the wrench movable cavity. A movable groove for the vertical reciprocating movement of the backstitching wrench is provided on the left side of the front of the column.

[0004] In this type of sewing machine, the backstitch lever is located on the left side of the front of the machine head column, with its inner end nestled within the lever's movable cavity, thus not occupying sewing area space and effectively reducing external space usage. However, in this type of sewing machine, the outer end of the backstitch lever protrudes from the machine head column, essentially forming a protruding section on the relatively flat outer wall of the machine head column. The outer end of the backstitch lever still occupies a significant amount of external space, posing a risk of accidental contact with the backstitch lever during sewing, potentially causing sewing malfunctions. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems existing in the prior art by proposing a backstitching wrench for a sewing machine, and to solve the technical problem of how to make the backstitching wrench occupy a small space.

[0006] The objective of this utility model can be achieved through the following technical solution: a sewing machine backstitching wrench, the sewing machine including a machine head, wherein the machine head is provided with a backstitching shaft, characterized in that the backstitching wrench includes a first connecting rod and a handle, the inner end of the first connecting rod passes through the outer wall of the machine head and is fixedly connected to the backstitching shaft, the outer end of the first connecting rod has a first limiting surface, the inner end of the handle has a second limiting surface, the outer end of the first connecting rod is hinged to the inner end of the handle, when the handle is folded at a right angle relative to the first connecting rod, the handle can be pressed against the outer wall of the machine head, when the handle is unfolded relative to the first connecting rod so that the first limiting surface and the second limiting surface are in contact, the handle and the first connecting rod are positioned.

[0007] When the handle is unfolded and positioned relative to the first connecting rod, pressing the handle will cause the backstitching wrench to rotate the backstitching shaft, thus achieving backstitching. When the handle is folded at a right angle relative to the first connecting rod, the handle rests against the outer wall of the machine head, preventing the backstitching wrench from protruding excessively outside the machine head and minimizing the space it occupies on the outside of the machine head. This prevents the operator from accidentally touching the backstitching wrench and avoids sewing malfunctions. Rotating the handle will cause the first and second limiting surfaces to align, positioning the handle and the first connecting rod, giving the backstitching wrench rigidity, and allowing it to drive the backstitching shaft to rotate, thus achieving backstitching.

[0008] In the aforementioned backstitching wrench of a sewing machine, the handle includes a second connecting rod and a stem portion. The stem portion has a recessed insertion groove. The second connecting rod is partially embedded in the insertion groove and fixed to the stem portion by bolts. The inner end of the second connecting rod is hinged to the outer end of the first connecting rod. The cooperation between the first and second connecting rods facilitates the connection between the first connecting rod and the handle. The insertion groove allows the second connecting rod to be inserted without occupying external space, resulting in a compact structure.

[0009] In the aforementioned backstitching wrench of a sewing machine, the outer end of the first connecting rod has a first stepped groove on one side, and the inner end of the second connecting rod has a second stepped groove on one side. The bottom of the first stepped groove is the first limiting surface, and the end face of the inner end of the second connecting rod is divided into the second limiting surface. The outer end of the first connecting rod and the inner end of the second connecting rod are interlocked through the first stepped groove and the second stepped groove, and are hinged together by bolts. This structure allows the first and second connecting rods to remain relatively thin after connection, demonstrating a reasonable design.

[0010] In the aforementioned backstitching wrench of a sewing machine, the remaining portion of the inner end face of the second connecting rod is a relief surface inclined inward and downward, which is connected to the second limiting surface. The relief surface prevents the second connecting rod from getting stuck when rotating relative to the first connecting rod.

[0011] In the aforementioned reverse sewing wrench for a sewing machine, the handle is made of plastic material, and its inner end has a notch. The outer end of the first connecting rod and the inner end of the second connecting rod are both located in the notch. A bolt passes through the outer end of the first connecting rod, the inner end of the second connecting rod, and the inner end of the handle, and is locked to hinge the first connecting rod to the handle. With this structure, the inner end of the handle has a certain degree of elasticity. When the bolt is tightened, the inner end of the handle is elastically tensioned. Only under the application of a certain external force can the handle rotate relative to the first connecting rod. This ensures that when the handle is upright, it will not unfold without external force, thus improving the stability of the reverse sewing wrench.

[0012] In the aforementioned backstitching lever of a sewing machine, the length of the first connecting rod protruding outside the machine head is less than or equal to the thickness of the inner end of the handle. This structure minimizes the external space occupied when the handle is upright and resting against the machine head.

[0013] Compared with the prior art, the sewing machine backstitching wrench provided by this utility model has the following advantages:

[0014] 1. When the handle of this reversing wrench is unfolded and positioned relative to the first connecting rod, pressing the handle will cause the reversing wrench to drive the reversing shaft to rotate, thereby realizing reversing. When the handle is folded at a right angle relative to the first connecting rod, the handle is close to the outer wall of the machine head, so that the reversing wrench does not protrude too much from the outside of the machine head, so that the space occupied by the reversing wrench on the outside of the machine head is small, and so that the operator will not accidentally touch the reversing wrench.

[0015] 2. The handle of this backfill wrench is made of plastic material, which gives the inner end of the handle a certain degree of elasticity. Only when a certain external force is applied can the handle rotate relative to the first connecting rod, so that when the handle is upright, it will not unfold without the application of external force, thus improving the stability of the backfill wrench. Attached Figure Description

[0016] Figure 1 This is a diagram showing the state of this back-locking wrench when it is stored upright.

[0017] Figure 2 This is a diagram showing the unfolded state of this back-locking wrench when in use.

[0018] Figure 3 This is an exploded view of the back-locking wrench when it is stored upright.

[0019] Figure 4 This is an exploded view of the backstitch wrench when it is unfolded and in use.

[0020] In the figure, 1 is the machine head; 2 is the backstitching shaft; 3 is the first connecting rod; 31 is the first limiting surface; 32 is the first step groove; 4 is the handle; 41 is the second limiting surface; 42 is the second connecting rod; 43 is the handle; 44 is the embedded groove; 45 is the second step groove; 46 is the clearance surface; and 47 is the notch. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] like Figure 1 , Figure 2 As shown, the sewing machine includes a sewing head 1, a backstitching shaft 2, and a backstitching wrench. Figure 3 , Figure 4 As shown, the backing wrench includes a first connecting rod 3 and a handle 4. The handle 4 includes a second connecting rod 42 and a shank 43. The shank 43 has a recessed groove 44. The second connecting rod 42 is partially embedded in the groove 44 and is fixedly connected to the shank 43 by bolts.

[0023] The reverse sewing shaft 2 is installed in the machine head 1, and the inner end of the first connecting rod 3 passes through the outer wall of the machine head 1 and is fixedly connected to the reverse sewing shaft 2. In this embodiment, the length of the first connecting rod 3 exposed outside the machine head 1 is less than the thickness of the inner end of the handle 43. In actual production, the length of the first connecting rod 3 exposed outside the machine head 1 is equal to the thickness of the inner end of the handle 43.

[0024] The first connecting rod 3 has a first stepped groove 32 on one side of its outer end, and the bottom of the first stepped groove 32 is a first limiting surface 31. The second connecting rod 42 has a second stepped groove 45 on one side of its inner end, and the end face of the inner end of the second connecting rod 42 is divided into a second limiting surface 41. The remaining part of the end face of the inner end of the second connecting rod 42 is a relief surface 46 that is inclined inward and downward, and the relief surface 46 is connected to the second limiting surface 41.

[0025] The handle 43 is made of plastic material. The inner end of the handle 43 has a notch 47. The outer end of the first connecting rod 3 and the inner end of the second connecting rod 42 are both located in the notch 47. The outer end of the first connecting rod 3 and the inner end of the second connecting rod 42 are connected to each other through the first stepped groove 32 and the second stepped groove 45. The first connecting rod 3 is hinged to the handle 4 by passing a bolt through the outer end of the first connecting rod 3, the inner end of the second connecting rod 42 and the inner end of the handle 43 and locking it. The inner end of the second connecting rod 42 is hinged to the outer end of the first connecting rod 3.

[0026] When storing, turn handle 4, as follows: Figure 1 As shown, the handle 4 is folded at a right angle relative to the first connecting rod 3, so that the handle 4 rests against the outer wall of the machine head 1. In use, the handle 4 is rotated as follows: Figure 2As shown, unfold the handle 4 relative to the first connecting rod 3 until the first limiting surface 31 and the second limiting surface 41 are in contact, so that the first connecting rod 3 and the handle 4 are positioned. Continue to press the handle 4 to rotate the reverse sewing shaft 2.

[0027] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0028] Although this document frequently uses terms such as machine head 1, backstitch shaft 2, first connecting rod 3, first limiting surface 31, first stepped groove 32, handle 4, second limiting surface 41, second connecting rod 42, handle 43, embedded groove 44, second stepped groove 45, clearance surface 46, and notch 47, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A rewinding wrench for a sewing machine, the sewing machine comprising a sewing head (1), wherein the sewing head (1) is provided with a rewinding shaft (2), characterized in that, The rewinding wrench includes a first connecting rod (3) and a handle (4). The inner end of the first connecting rod (3) passes through the outer wall of the machine head (1) and is fixedly connected to the rewinding shaft (2). The outer end of the first connecting rod (3) has a first limiting surface (31), and the inner end of the handle (4) has a second limiting surface (41). The outer end of the first connecting rod (3) is hinged to the inner end of the handle (4). When the handle (4) is folded at a right angle relative to the first connecting rod (3), the handle (4) can be pressed against the outer wall of the machine head (1). When the handle (4) is unfolded relative to the first connecting rod (3) so that the first limiting surface (31) and the second limiting surface (41) are in contact, the handle (4) and the first connecting rod (3) are positioned.

2. The backstitching wrench for a sewing machine according to claim 1, characterized in that, The handle (4) includes a second link (42) and a handle (43). The handle (43) has a recessed groove (44). The second link (42) is partially embedded in the groove (44) and fixed to the handle (43) by bolts. The inner end of the second link (42) is hinged to the outer end of the first link (3).

3. The backstitching wrench for a sewing machine according to claim 2, characterized in that, The first connecting rod (3) has a first stepped groove (32) on one side of its outer end, and the second connecting rod (42) has a second stepped groove (45) on one side of its inner end. The bottom of the first stepped groove (32) is the first limiting surface (31), and the end face of the inner end of the second connecting rod (42) is divided into the second limiting surface (41). The outer end of the first connecting rod (3) and the inner end of the second connecting rod (42) are connected to each other through the first stepped groove (32) and the second stepped groove (45) and are locked together by bolts so that the first connecting rod (3) and the second connecting rod (42) are hinged together.

4. A sewing machine backstitching wrench according to claim 3, characterized in that, The remaining part of the inner end face of the second connecting rod (42) is a relief surface (46) that is inclined inward and downward, and the relief surface (46) is connected to the second limiting surface (41).

5. A rewinding wrench for a sewing machine according to claim 2, 3, or 4, characterized in that, The handle (43) is made of plastic material. The inner end of the handle (43) has a notch (47). The outer end of the first connecting rod (3) and the inner end of the second connecting rod (42) are both located in the notch (47). The first connecting rod (3) is hinged to the handle (4) by passing a bolt through the outer end of the first connecting rod (3), the inner end of the second connecting rod (42) and the inner end of the handle (43) and locking it.

6. A sewing machine backstitching wrench according to claim 2, 3, or 4, characterized in that, The length of the first connecting rod (3) protruding outside the machine head (1) is less than or equal to the thickness of the inner end of the handle (43).

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