TWI597401B - Thread Retaining Mechanism of Sewing Machine - Google Patents

Description

Sewing machine thread holding mechanism

The present invention relates to a wire holding mechanism for starting a sewing operation by sewing a sewing machine, and more particularly to a sewing machine wire holding mechanism which uses a single elastic member to simplify the number of components.

The sewing machine mainly combines several layers of fabric through stitching sewing. Whether it is sewing fabrics for sewing clothes or sewing machines for sewing leather objects, the industrial sewing machine with automatic thread cutting function will require the length of the thread to be used. Keeping it in an appropriate range to prevent the suture from being detached from the pinhole, it is necessary to include a line retaining device to obtain a stable seam quality under the condition that the length of the thread that controls the needle is more precise.

Wherein, in the thread holding device, when the sewing needle starts the sewing operation, the starting end of the suture can be clamped under the cloth, and after the predetermined number of stitches is performed, the held stitch can be smoothly opened, however, In the vicinity of the position where the general wire holding device is installed, mechanical components such as a hook mechanism and a tangential mechanism are usually installed, and therefore, the upper wire holding device design can accurately perform the action and can be placed in a limited manner. The space is the focus of the sewing machine needs.

Please refer to the upper thread holding device of the sewing machine disclosed in the Chinese Patent Publication No. CN101845723. The clamping unit of the upper thread holding device includes a first clamping member, a second clamping member, a supporting member, a linkage action unit and an opening and closing action unit. section.

The first clamping member is provided with a catching portion, an opening and closing plate, a mounting portion, a bracket portion and a permanent through hole. The bracket portion is mounted with a pretensioning spring connected to the opening and closing plate, and the through hole is disposed in the through hole. a tension spring as a linkage action unit, and is respectively connected between the first clamping member and the second clamping member by the tension spring; and further, the second clamping member includes a front side member and a rear side member. The front side member is rotatably coupled to the rear side member through a connecting body, and the rear side member is coupled to the other side of the tension spring, and is continuously applied to bring the rear side member and the through hole toward each other. Preloading force.

However, the above-mentioned wire holding device is connected to different members of the entire clamping unit by two springs, which increases the number of components of the wire holding device and causes an increase in the volume of the wire holding member, in addition to the first clamping. The structural form of the component and the second clamping component is complicated, resulting in an increase in the cost of manufacturing the component.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a wire holding mechanism that simplifies the number of components by using a single elastic member, which can effectively reduce the size of the wire holding mechanism and reduce the manufacturing cost of the entire wire holding mechanism.

A secondary object of the present invention is that the two clamping members of the wire holding mechanism and the wire holding members are pivotally coupled to each other, and the limited assembly space can be utilized to complete the action stroke of the clamping and paying lines.

In order to achieve the above object, the wire holding mechanism of the sewing machine of the present invention comprises a support plate, a wire holding member, a first clamping member, a second clamping member, a driving device and an elastic member, wherein the supporting plate is provided with a The first shaft hole and a stop block.

The wire holder is pivotally connected to the first shaft hole, and is provided with an opening portion having an arc shape, a second shaft hole and a blocking portion, and a slit for connecting with the needle is inserted in the opening portion. .

The first clamping member is pivotally connected to the second shaft hole, and a first clamping arm abutting against the opening portion is disposed, so that the opening portion is in a closed state.

The second clamping member is pivotally connected to the first shaft hole, and is provided with a second clamping arm corresponding to the first clamping arm, and can be pushed by the blocking portion of the wire holding member, so that the second clamping arm and the above The first clamp arms are in contact with each other to clamp a suture between the second clamp arm and the first clamp arm.

The driving device is configured to drive the first clamping member and the second clamping member to sequentially release an initial position of the needle into the opening, a clamping position for clamping the stitch, and a release from the initial position. Move back and forth between positions.

When the first clamping member and the second clamping member are moved from the clamping position to the releasing position, the stopper block is engaged with the first clamping member, so that the opening portion and the first clamping arm Separated from each other.

The elastic member is disposed between the first clamping member and the second clamping member, and the elastic member can ensure that the first clamping member is moved from the initial position to the releasing position, and the first portion can be ensured The two holding members are returned to the initial position by the release position.

In a preferred embodiment, the driving device drives the wire holding member and the first clamping member to deflect; the wire holding member has a fixed axial center, and the first clamping member has an arc along the arc. The movable axis of the path moves, and the second clamping member is also deflected along the fixed axis.

Further, in the initial position, the blocking portion of the wire holder has an opening distance between the blocking member and the second clamping member, and the wire holding mechanism may further comprise an adjustable displacement member, the adjusting member Relying on the second clamping member and adjusting the opening distance.

Furthermore, a bottom surface of the support plate is provided with a stop block adjacent to the receiving opening, and the first clamping member is engaged by the stopper. The wire holder and the second clamping member are pivotally disposed on a top surface of the support plate, and the first clamping member is located on a top surface of the support plate, and is simultaneously pivotally connected to the wire holder and the driving device. . Further, the first clamping member is provided with a blocking arm, and the blocking arm forms a height difference from the first clamping arm, and is located at a bottom surface of the supporting plate and can be in contact with the stopping block.

In addition, the wire holder is further provided with a support portion, and the support portion is formed with a flange having a height lower than the opening portion, and when the first clamp arm is moved from the release position to the clamping position, The first clamp arm is supported by the flange and is held at the same height position as the opening.

The invention is characterized in that the elastic member is connected between the first clamping member and the second clamping member, so that the elastic member can respectively respectively face the first clamping member and the second clamping member at different positions. The member acts to move the first clamping member to generate a clockwise torque during the movement from the initial position to the release position, and to return to the initial position during the release position, The elastic member can drive the second clamping member to generate a counterclockwise torque. In this way, the two clamping members and the wire holding member can be pivotally matched with each other, and the limited assembly space can be utilized to complete the action stroke of the clamping and paying, and the number of components can be simplified, and the overall device can be effectively reduced. volume of.

In order to further clarify and understand the structure, the use and the features of the present invention, the preferred embodiment is described in detail with reference to the following drawings:

Referring to FIG. 1, the wire holding mechanism 1 of the present invention is located inside the base 2 of a sewing machine. The front end of the base 2 forms a base structure 20 which is substantially cylindrical, and a device space 21 is formed on the top of the base structure 20. Above the device space 21 is mounted a needle plate 22 forming an opening 23 for the needle 10 (see FIGS. 4A, 5A, 6A) to enter, and the wire holding mechanism 1 is installed in the device space 21 when entering the device space 21 The center stitch 10 can hold the thread end of a stitch 11 on the bottom surface of the needle plate 22 during the sewing process from the first stitch at the start of sewing to the needle drop of the predetermined number of stitches.

Referring to FIG. 2 and FIG. 3, the wire holding mechanism 1 of the present invention comprises a supporting plate 3, a wire holding member 4, a first clamping member 5, a second clamping member 6, a driving device 7, and an elastic The piece 8 and an adjustment piece 9 are seven parts.

The receiving plate 3 is formed with a receiving area 30 and a driving area 31. The receiving area 30 is formed with a wire holder 4, a first clamping member 5, a second clamping member 6, and an elastic member 8. a first slot 32 in which the relative displacement is located, and a first shaft hole 33 pivotally connected to the wire holder 4 and the second clamping member 6 , and the first slot 32 defines a downwardly extending bottom surface The stop block 34 is formed with a retaining groove 35, a second slot 36, a first pivot hole 37 and a screw hole 38.

The wire holder 4 has a first pivoting portion 40 that is assembled on the top surface of the first shaft hole 33. The first pivoting portion 40 extends toward the outside of the support plate 3, and protrudes from the support plate 3 to form a representation. An opening portion 41 of the arc shape, and a support portion 42 , a stopper portion 43 and a second shaft hole 44 are disposed between the opening portion 41 and the first pivot portion 40 , and the support portion 42 faces the outside of the support plate 3 A flange 421 having a height lower than the opening portion 41 is formed, and the stopper portion 43 extends toward the first slot 32 and is vertically bent to form a longitudinal projection.

The first clamping member 5 is located on the top surface of the support plate 3 and is connected to the second shaft hole 44 of the wire holder 4, and has a first clamping arm 50 formed toward the outside of the supporting plate 3, and allows The first clamp arm 50 abuts against the opening 41, so that the opening 41 can be closed. In addition, the first clamping member 5 is further provided with a blocking arm 51 located at the bottom surface of the supporting plate 3 and a hook arm 52 located beside the blocking arm 51. The blocking arm 51 forms a height with the first clamping arm 50. The gap enables the above-described stopper arm 51 to swing to a position where the stopper member 34 of the support plate 3 is in contact with when the first holder 5 pivots relative to the wire holder 4.

The second clamping member 6 also has a second pivoting portion 60 assembled on the top surface of the first shaft hole 33, and a second clamping arm extends from the second pivoting portion 60 toward the outside of the supporting plate 3. 61. The second clamping arm 61 partially covers the opening portion 41, and a clamping block corresponding to the first clamping arm 50 is formed inside the opening portion 41, and the second pivoting portion 60 is further oriented. An abutting portion 62 and a hook portion 63 extend from the inside of the first slot 32. The above-mentioned abutting portion 62 can be pushed by the blocking portion 43 of the above-mentioned wire holder 4, so that the first clamping arm 50 and the second clamping arm 61 which originally exhibit the separated state are close to each other from the distant position until they contact each other, so that the above-mentioned suture The 11 is clamped between the second clamp arm 61 and the first clamp arm 50 to assume a holding state.

The driving device 7 is provided with a motor (not shown) as a driving source and a connecting rod set. The connecting rod set is provided with a swinging rod 71, a connecting rod 72 and a moving rod 73. One end of the swinging rod 71 is mounted on the above. The first pivot hole 37 is connected to the connecting rod 72 through the second slot 36 so that the swing lever 71 and the connecting rod 72 are respectively located on opposite sides of the upper and lower sides of the support plate 3, and the moving rod One end of the 73 is connected to a central position between the two ends of the swinging rod 71, and is displaceable within the range of the above-mentioned retaining groove 35, and the other end is connected to the second shaft hole 44 of the wire holding member 4; The other end of the 72 is assembled to the above-described motor (not shown) as a drive source, and can drive the swing lever 71 to perform a yaw displacement of a predetermined angular range.

The driving device 7 is configured to drive the first clamping member 5 and the second clamping member 6 to sequentially insert the needle 10 into an initial position of the opening 41 (see FIG. 4A), and clamp the suture 11 The gripping position (Fig. 5A) and a release position (Fig. 6A) away from the initial position are moved back and forth.

The elastic member 8 is disposed between the hook arm 52 of the first clamping member 5 and the hook portion 63 of the second clamping member 6 and is located in the first slot 32 of the support plate 3, as shown in the figure. It is shown that the elastic member 8 is provided as a tension spring. Further, the adjusting member 9 is attached to the screw hole 38 of the support plate 3, and is capable of adjusting the abutment position between the movable displacement and the second holding member 6.

Referring to FIG. 4A and FIG. 4B, when the wire holding mechanism 1 is in the initial position driven by the driving device 7, the opening portion 41 of the wire holder 4 and the first clamping arm 50 of the first clamping member 5 are Formed in a closed state by the action of the elastic member 8, the clip of the second clamping member 6 and the first clamping arm 50 are separated, and the blocking portion 43 of the wire holding member 4 and the above The abutting portions 62 of the two holding members 6 form an opening distance.

Referring to FIGS. 5A and 5B, when the wire holding mechanism 1 generates a displacement of a predetermined distance by the moving rod 73 of the driving device 7, the wire holding member 4 and the first holding member 5 are simultaneously subjected to the moving rod 73. When the wire holder 4 is rotated about the first pivoting portion 40, a clockwise rotation will occur when the moving rod 73 is pulled, and the first clamping member 5 is subjected to the elastic member 8. The elastic force is pulled, and a clockwise rotation is also generated in the case where the moving rod 73 is pulled. Therefore, the wire holder 4 and the first holding member 5 can be kept rotated in a closed state.

Subsequently, the second clamping arm 61 of the second clamping member 6 is contacted by the first clamping arm 50 to form a clamping state, and then the abutting portion 62 of the second clamping member 6 is subjected to the blocking portion. The synchronous pushing of 43 enables the above-described wire holder 4, the first holding member 5, and the second holding member 6 to be simultaneously rotated.

Referring to FIGS. 6A and 6B, in the above-described line holding mechanism 1 during the movement of the moving rod 73 of the driving device 7 from the position of FIGS. 5A, 5B to the other opposite end, the blocking arm 51 and the support plate 3 will be The stoppers 34 are in contact with each other, so that the first clamping member 5 stops rotating, and the wire holder 4 still rotates, so that the second clamping member 6 is rotated by the blocking portion 43 and still rotates. At this time, the first clamp arm 50 will be separated from the second clamp arm 61 to form a released state, and in addition, the elastic member 8 will be stretched.

During the movement of the driving device 7 back to the clamping position by the releasing position, the elastic member 8 will ensure that the second clamping member 6 generates a counterclockwise movement, and the first clamping arm 50 will be subjected to the above The flange 421 of the wire holder 4 is erected to ensure that the opening portion 41 is maintained at the same height position. Subsequently, when the driving device 7 returns to the initial position from the clamping position, the elastic member 8 continues to act on the second clamping member 6 to generate a counterclockwise torque.

Observing the state in which the wire holding mechanism 1 moves back and forth between the initial position, the clamping position, and the releasing position, the wire holding member 4 has a fixed axial center with a constant position, and the first clamping member 5 has an edge. The active axis of the arc path moves.

Referring to FIG. 7 , the length of the opening distance between the blocking portion 43 and the receiving portion 62 is mainly affected by the left and right positions of the adjusting member 9 . When the adjusting member 9 approaches the moving rod 73 , The length of the opening distance is reduced, so that the area of the opening portion 41 covered by the second holding member 6 is reduced. Conversely, when the adjusting member 9 is away from the moving rod 73, the opening is performed. The length of the distance is increased, so that the area of the opening 41 covered by the second holder 6 is increased.

The above embodiments are intended to be illustrative only, and are not intended to limit the scope of the present invention. It is included in the scope of the following patent application.

1‧‧‧Line retention mechanism

10‧‧‧ stitches

11‧‧‧ stitching

2‧‧‧Base

20‧‧‧Base structure

21‧‧‧Device space

22‧‧‧ needle board

23‧‧‧Opening

3‧‧‧Support board

30‧‧‧Receiving area

31‧‧‧ Drive area

32‧‧‧First slot

33‧‧‧First shaft hole

34‧‧‧stop block

35‧‧‧Receiving grooves

36‧‧‧Second slot

37‧‧‧First pivot hole

38‧‧‧ screw holes

4‧‧‧ wire holder

40‧‧‧First pivotal

41‧‧‧ openings

42‧‧‧Support

421‧‧‧Flange

43‧‧ ‧ blocking

44‧‧‧Second shaft hole

5‧‧‧First clamping piece

50‧‧‧First clamp arm

51‧‧‧Block arm

52‧‧‧ hook arm

6‧‧‧Second grip

60‧‧‧Second pivotal

61‧‧‧Second clamp arm

62‧‧‧Attendance

63‧‧‧Hook

7‧‧‧ drive

71‧‧‧swing rod

72‧‧‧ Connecting rod

73‧‧‧ moving rod

8‧‧‧Flexible parts

9‧‧‧Adjustment

1 is a partially exploded perspective view of the sewing machine base of the present invention; FIG. 2 is a perspective view of the wire retaining mechanism of the present invention; FIG. 3 is an exploded view of the wire retaining mechanism of FIG. 2; FIG. 4A is a perspective view of the wire retaining mechanism at an initial position; Figure 5A is a perspective view of the wire holding mechanism in the clamping position; Figure 5B is a plan view of the wire holding mechanism in the clamping position; Figure 6A is a perspective view of the wire holding mechanism in the released position; Figure 6B A plan view of the wire holding mechanism in the release position; FIG. 7 is a schematic view of the adjustment member changing the relative position.

3‧‧‧Support board

30‧‧‧Receiving area

31‧‧‧ Drive area

32‧‧‧First slot

33‧‧‧First shaft hole

34‧‧‧stop block

35‧‧‧Receiving grooves

36‧‧‧Second slot

37‧‧‧First pivot hole

38‧‧‧ screw holes

4‧‧‧ wire holder

40‧‧‧First pivotal

41‧‧‧ openings

42‧‧‧Support

421‧‧‧Flange

43‧‧ ‧ blocking

44‧‧‧Second shaft hole

5‧‧‧First clamping piece

50‧‧‧First clamp arm

51‧‧‧Block arm

52‧‧‧ hook arm

6‧‧‧Second grip

60‧‧‧Second pivotal

61‧‧‧Second clamp arm

62‧‧‧Attendance

63‧‧‧Hook

7‧‧‧ drive

71‧‧‧swing rod

72‧‧‧ Connecting rod

73‧‧‧ moving rod

8‧‧‧Flexible parts

9‧‧‧Adjustment

Claims (7)

A wire holding mechanism for a sewing machine, comprising: a support plate having a first shaft hole and a stop block; a wire holding member pivotally connected to the first shaft hole, and an opening portion having an arc shape, a first a second shaft hole and a blocking portion, wherein a slit connected to the needle is inserted into the opening portion; a first clamping member is pivotally connected to the second shaft hole, and a first portion is abutted against the opening portion a clamping arm, the opening portion is in a closed state; a second clamping member is pivotally connected to the first axial hole, and a second clamping arm corresponding to the first clamping arm is disposed, and is capable of receiving the wire holding member The driving portion is driven to enable the second clamping arm and the first clamping arm to be in contact with each other, and the suture is clamped between the second clamping arm and the first clamping arm; a driving device drives the first The clamping member and the second clamping member are sequentially moved back and forth between an initial position in which the needle is inserted into the opening, a clamping position in which the stitch is held, and a released position away from the initial position; An elastic member mounted on the first Between the holding member and the second clamping member, the first clamping member can be ensured to move from the initial position to the releasing position, and the second clamping member can be ensured to return to the initial position from the releasing position; Wherein, when the first clamping member and the second clamping member are moved from the clamping position to the releasing position, the stopper block is engaged with the first clamping member, so that the opening portion and the first portion are The clamp arms are separated from each other. The thread holding mechanism of the sewing machine according to the first aspect of the invention, wherein the driving device drives the wire holder and the first holder to deflect. The thread holding mechanism of the sewing machine according to the second aspect of the invention, wherein the wire holder has a fixed axis having a constant position, and the first holding member has a movable axis that moves along an arc path. The wire holding mechanism of the sewing machine according to the third aspect of the invention, wherein the second holding member is also deflected along the fixed axis. The thread holding mechanism of the sewing machine according to the first aspect of the invention, wherein, in the initial position, the blocking portion of the wire holder has an opening distance from the second holding member. The thread holding mechanism of the sewing machine according to the fifth aspect of the invention, wherein the wire holding mechanism further comprises an adjustable displacement member, wherein the adjusting member abuts against the second clamping member and is adapted to change the opening The length of the distance in the above initial position. The wire holding mechanism of the sewing machine according to the first aspect of the invention, wherein the wire holding member is further provided with a support portion, and the support portion is formed with a flange having a height lower than the opening portion, wherein the first clamp arm is When the release position is moved to the nip position, the first clamp arm is supported by the flange and held at the same height position as the opening.