CN107841834B

CN107841834B - Thread holding mechanism of sewing machine

Info

Publication number: CN107841834B
Application number: CN201610830087.4A
Authority: CN
Inventors: 陈旭辉
Original assignee: Chee Siang Industrial Co Ltd
Current assignee: Chee Siang Industrial Co Ltd
Priority date: 2016-09-19
Filing date: 2016-09-19
Publication date: 2020-01-10
Anticipated expiration: 2036-09-19
Also published as: CN107841834A

Abstract

The invention relates to a thread holding mechanism of a sewing machine, which mainly comprises an opening part and a blocking part formed by a thread holding piece, a thread is inserted into the opening part, a first clamping part is used for forming a first clamping arm to close the opening part, a second clamping part is used for forming a second clamping arm corresponding to the first clamping arm, and an elastic part is arranged between the two clamping parts, wherein the first clamping part and the second clamping part are driven by a driving device to move back and forth sequentially from an initial position, a clamping position and a releasing position, the second clamping part is pushed by the blocking part to be in contact with the first clamping arm to clamp the thread in the moving process, and then the first clamping part is blocked by a blocking block to separate the two clamping arms again. The invention uses a single elastic piece to ensure that the first clamping piece moves from the initial position to the release position and the second clamping piece returns to the initial position from the release position, thereby simplifying the number of components of the thread holding mechanism and achieving the reduction of the volume.

Description

Thread holding mechanism of sewing machine

Technical Field

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

Background

The sewing machine mainly combines a plurality of layers of cloth through sewing, no matter the sewing machine sews the cloth of clothing articles or sews leather objects, the length of the thread end of the set-up needle must be kept in a proper range for the industrial sewing machine with the automatic thread cutting function, the sewing thread is prevented from being separated from a needle hole, and a thread retaining device is required to be included under the condition of more accurate length of the thread end of the set-up needle in control so as to obtain stable sewing quality.

The thread holding device is configured to hold a starting end of a thread under a cloth when a sewing operation is started by a sewing needle, and smoothly open the held thread after a predetermined number of stitches, but generally, a mechanical member is mounted at a position near a position where the thread holding device is mounted, and the mechanical member includes a plurality of other parts, for example: the rotating shuttle mechanism and the thread cutting mechanism are important for the sewing machine, so that how to design the upper thread retaining device to accurately complete the action and place the upper thread retaining device into a limited space is required.

Please refer to the upper thread holding device of the sewing machine disclosed in chinese patent publication No. CN101845723, wherein the clamping unit of the upper thread holding device comprises five parts, namely a first clamping member, a second clamping member, a supporting member, a linkage action unit and an opening and closing action unit.

The first clamping component is provided with a capturing part, an opening and closing plate, a mounting part, a bracket part and a through hole, the bracket part is provided with a pre-tightening spring connected with the opening and closing plate, and the through hole is internally provided with an extension spring serving as a linkage action unit and is respectively connected between the first clamping component and the second clamping component by the extension spring; the second clamping member includes a front member and a rear member, the front member and the rear member being rotatable with respect to each other via a coupling body, the rear member being coupled to the other side of the tension spring, and a biasing force urging the rear member and the through-hole toward each other being continuously applied.

However, the wire holding device is connected to different members of the whole clamping unit by two springs, which increases the number of members of the wire holding device and increases the volume of the wire holder.

Disclosure of Invention

In order to solve the technical problem, the invention aims to: to provide a thread holding mechanism in which the number of components is simplified by using a single elastic member, the size of the thread holding mechanism can be effectively reduced, and the manufacturing cost of the entire thread holding mechanism can be reduced.

The secondary purpose of the invention is that the two clamping pieces of the wire holding mechanism and the wire holding piece are mutually matched in a pivoting mode, and the limited assembling space can be fully utilized to complete the action strokes of wire clamping and wire releasing.

In order to realize the purpose, the technical scheme adopted by the invention is as follows: a thread holding mechanism of a sewing machine, comprising:

a supporting plate provided with a first shaft hole and a stop block;

a thread holder pivoted to the first axial hole and having an arc opening for inserting a thread connected to a needle, a second axial hole and a stopper;

the first clamping piece is pivoted with the second shaft hole and is provided with a first clamping arm which is abutted against the opening part, so that the opening part is in a closed state;

the second clamping piece is pivoted with the first shaft hole, is provided with a second clamping arm corresponding to the first clamping arm and can be pushed by the blocking part of the thread holding piece, so that the second clamping arm can be contacted with the first clamping arm to clamp the thread between the second clamping arm and the first clamping arm;

the driving device drives the first clamping piece and the second clamping piece to move back and forth between an initial position where the sewing needle is inserted into the opening part, a clamping position where the sewing thread is clamped and a releasing position away from the initial position in sequence; and

the elastic piece is arranged between the first clamping piece and the second clamping piece, can ensure that the first clamping piece moves from the initial position to the release position, and can ensure that the second clamping piece returns to the initial position from the release position;

when the first clamping piece and the second clamping piece move from the clamping position to the releasing position, the stop block is clamped against the first clamping piece, so that the opening part and the first clamping arm are separated from each other.

In the thread holding mechanism of the sewing machine, the elastic member is installed between the first clamping member and the second clamping member, and the elastic member can ensure that the first clamping member moves from the initial position to the release position and the second clamping member returns from the release position to the initial position.

In a preferred embodiment, the driving device drives the thread holding member and the first clamping member to deflect; the wire holder has a fixed axis of constant position, the first clamping member has a movable axis that moves along an arcuate path, and the second clamping member also deflects along the fixed axis.

In the thread holding mechanism of the sewing machine, when the thread holding mechanism is at the initial position, an opening distance is formed between the blocking part of the thread holding member and the second clamping member, and the thread holding mechanism can further comprise an adjusting member capable of relative displacement, wherein the adjusting member is abutted against the second clamping member and is used for adjusting the opening distance.

The thread holding mechanism of the sewing machine is characterized in that a stop block adjacent to the accommodating opening is arranged on the bottom surface of the supporting plate, and the stop block is clamped against the first clamping piece. The wire holding piece and the second clamping piece are pivoted on the top surface of the supporting plate, and the first clamping piece is positioned on the top surface of the supporting plate and is pivoted with the wire holding piece and the driving device. The first clamping piece is provided with a blocking arm, and the blocking arm and the first clamping arm form a height difference, are positioned at the bottom surface of the supporting plate and can be in contact with the stop block.

The thread holding mechanism of a sewing machine, wherein the thread holding member is further provided with a support portion 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 clamp position, the first clamp arm is supported by the flange and is held at the same height position as the opening portion.

Compared with the prior art, the invention adopting the technical scheme has the advantages that: the elastic piece is connected between the first clamping piece and the second clamping piece, so that the elastic piece can respectively act on the first clamping piece and the second clamping piece at different positions, the elastic piece can drive the first clamping piece to generate clockwise torsion in the action process of moving from the initial position to the release position, and the elastic piece can drive the second clamping piece to generate counterclockwise torsion in the action process of returning from the release position to the initial position. Therefore, the two clamping pieces and the wire holding piece are mutually matched in a pivoting mode, the limited assembling space can be fully utilized to finish the action strokes of wire clamping and paying off, the number of components can be really simplified, and the size of the whole device is effectively reduced.

Drawings

FIG. 1 is a partially exploded view of a sewing machine base according to the present invention;

FIG. 2 is a perspective view of the wire retention mechanism of the present invention;

FIG. 3 is an exploded view of the wire retention mechanism of FIG. 2;

FIG. 4A is a perspective view of the wire retention mechanism in an initial position;

FIG. 4B is a top view of the wire retention mechanism in an initial position;

FIG. 5A is a perspective view of the wire retention mechanism in a clamping position;

FIG. 5B is a top view of the wire retention mechanism in the clamping position;

FIG. 6A is a perspective view of the wire retention mechanism in the release position;

FIG. 6B is a top view of the wire retention mechanism in the release position;

fig. 7 is a schematic view of the change in relative position of the adjustment member.

Description of reference numerals: 1-a thread retention mechanism; 10-sewing a needle; 11-a suture; 2-a base; 20-a base structure; 21-device space; 22-a needle plate; 23-opening a hole; 3-a support plate; 30-a housing area; 31-a drive region; 32-a first slot; 33-a first shaft hole; 34-a stop block; 35-abdicating the groove; 36-a second slot; 37-a first pivot hole; 38-screw hole; 4-a wire holder; 40-a first pivot; 41-opening part; 42-a support portion; 421-a flange; 43-a stop; 44-second shaft hole; 5-a first clamping member; 50-a first clamp arm; 51-a catch arm; 52-hook arm; 6-a second clamp; 60-a second pivot; 61-a second clamp arm; 62-a receiving portion; 63-hook part; 7-a drive device; 71-a swing lever; 72-a connecting rod; 73-moving the rod; 8-an elastic member; 9-adjusting piece.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings, the advantages and features of which will become apparent as the description proceeds.

Referring to fig. 1, the thread holding mechanism 1 of the present invention is located inside a base 2 of a sewing machine, a base structure 20 having a substantially cylindrical shape is formed at a front end of the base 2, a mounting space 21 is formed at a top of the base structure 20, a needle plate 22 having an opening 23 for a needle 10 (see fig. 4A, 5A and 6A) to enter is mounted above the mounting space 21, and the thread holding mechanism 1 is mounted in the mounting space 21, and when the needle 10 enters the mounting space 21 from a first needle at the beginning of sewing to a needle drop of a predetermined number of needles, the thread holding mechanism 1 can hold a thread end of a thread 11 at a bottom surface of the needle plate 22 during sewing.

Referring to fig. 2 and 3, the thread holding mechanism 1 of the present invention includes seven parts, namely a supporting plate 3, a thread holding member 4, a first clamping member 5, a second clamping member 6, a driving device 7, an elastic member 8 and an adjusting member 9.

Be formed with a holding area 30 and a drive area 31 on the backup pad 3, holding area 30 is formed with a confession line holder 4, first holder 5, second holder 6 and elastic component 8 four are located first slotted hole 32 and a cooperation of relative displacement wherein line holder 4 and the first shaft hole 33 of second holder 6 pin joint, just first slotted hole 32 is other to be equipped with one by bottom surface downwardly extending's backstop piece 34, and drive area 31 is formed with a recess 35 of stepping down, a second slotted hole 36, a first pivot hole 37 and a screw hole 38.

The thread holding member 4 has a first pivot portion 40 assembled on the top surface of the first shaft hole 33, the first pivot portion 40 extends toward the outer side of the supporting plate 3 and protrudes out of the supporting plate 3 to form an opening portion 41 in an arc shape, a supporting portion 42, a blocking portion 43 and a second shaft hole 44 are arranged between the opening portion 41 and the first pivot portion 40, the supporting portion 42 forms a flange 421 lower than the opening portion 41 toward the outer side of the supporting plate 3, and the blocking portion 43 extends toward the first shaft hole 32 and is vertically bent to form a longitudinal protrusion.

The first clamping member 5 is located on the top surface of the supporting plate 3 and is connected to the second shaft hole 44 of the thread holding member 4, and has a first clamping arm 50 formed toward the outer side of the supporting plate 3, and the first clamping arm 50 is abutted against the opening 41, so that the opening 41 is in a closed state. In addition, the first clamping member 5 is further provided with a stop arm 51 located at the bottom surface of the supporting plate 3 and a hook arm 52 located beside the stop arm 51, and the stop arm 51 and the first clamping arm 50 form a height difference, so that the stop arm 51 can swing to be connected with the stop block 34 of the supporting plate 3 when the first clamping member 5 pivots relative to the wire holding member 4.

The second clamping member 6 also has a second pivot portion 60 assembled on the top surface of the first shaft hole 33, and a second clamping arm 61 extends from the second pivot portion 60 toward the outer side of the supporting plate 3, the second clamping arm 61 partially covers the opening 41, a clamping block corresponding to the first clamping arm 50 is formed in the opening 41, and a supported portion 62 and a hook portion 63 extend from the second pivot portion 60 toward the interior of the first slot hole 32. The supported portion 62 can be pushed by the blocking portion 43 of the thread holding member 4, so that the first clamping arm 50 and the second clamping arm 61, which are originally separated, approach each other from a distant position until they contact each other, and the suture 11 is clamped between the second clamping arm 61 and the first clamping arm 50 to assume a holding state.

The driving device 7 is provided with a motor (not shown) as a driving source and a linkage, the linkage is provided with a swing rod 71, a connecting rod 72 and a moving rod 73, one end of the swing rod 71 is mounted on the first pivot hole 37, the other end is connected with the connecting rod 72 through the second slot hole 36, so that the swing rod 71 and the connecting rod 72 are respectively located at the upper and lower opposite sides of the supporting plate 3, and one end of the moving rod 73 is connected to the central position between the two ends of the swing rod 71 and can be displaced within the range of the abdicating groove 35, and the other end is connected to the second shaft hole 44 of the thread holder 4; the other end of the link lever 72 is assembled to the motor (not shown) as a driving source, and can drive the swing lever 71 to perform a yawing displacement within a predetermined angular range.

The driving device 7 is used to drive the first clamping member 5 and the second clamping member 6 to move back and forth between an initial position (fig. 4A) for inserting the needle 10 into the opening 41, a clamping position (fig. 5A) for clamping the suture 11, and a releasing position (fig. 6A) away from the initial position.

The elastic element 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 supporting plate 3, as shown in the figure, the elastic element 8 is a tension spring. Furthermore, the adjusting member 9 is mounted in the screw hole 38 of the supporting plate 3 and can be movably displaced to adjust the abutting position with the second clamping member 6.

Referring to fig. 4A and 4B, when the thread holding mechanism 1 is at the initial position driven by the driving device 7, the opening 41 of the thread holding member 4 and the first clamping arm 50 of the first clamping member 5 are in the closed state under the action of the elastic member 8, the clamping block of the second clamping member 6 and the first clamping arm 50 are in the separated state, and the blocking portion 43 of the thread holding member 4 and the supported portion 62 of the second clamping member 6 form an opening distance.

Referring to fig. 5A and 5B, when the moving rod 73 of the driving device 7 is displaced by a predetermined distance, the thread holding member 4 and the first clamping member 5 are pulled by the moving rod 73 at the same time, and since the thread holding member 4 takes the first pivoting portion 40 as a rotation center, a clockwise rotation is generated when the moving rod 73 is pulled, and the first clamping member 5 is pulled by the elastic force of the elastic member 8, and a clockwise rotation is also generated when the moving rod 73 is pulled, the thread holding member 4 and the first clamping member 5 can be rotated while being kept in a closed state.

Subsequently, the second clamping arm 61 of the second clamping member 6 is contacted and abutted by the first clamping arm 50 to form a wire clamping state, and then, the abutted part 62 of the second clamping member 6 is synchronously pushed by the blocking part 43, so that the wire holder 4, the first clamping member 5 and the second clamping member 6 can be simultaneously rotated.

Referring to fig. 6A and 6B, in the process that the moving rod 73 of the driving device 7 moves from the position shown in fig. 5A and 5B to the opposite end, the stopping arm 51 will contact with the stopping block 34 of the supporting plate 3, so that the first clamping member 5 stops rotating, and the wire holder 4 will still rotate, so that the second clamping member 6 is still rotated by the stopping part 43, and at this time, the first clamping arm 50 will be separated from the second clamping arm 61 to form a released state, and besides, the elastic member 8 will be stretched.

During the movement of the driving device 7 from the release position back to the clamping position, the elastic member 8 will ensure a counterclockwise movement of the second clamping member 6, and the first clamping arm 50 will be supported by the flange 421 of the thread maintaining member 4, so as to ensure the same height position as the opening 41. Subsequently, if the driving device 7 returns to the initial position from the clamping position, the elastic member 8 still continues to act on the second clamping member 6 to generate a counterclockwise torque.

Observing the state of the thread holding mechanism 1 moving back and forth between the initial position, the clamping position and the releasing position, the thread holding member 4 has a fixed axis with a constant position, and the first clamping member 5 has a movable axis moving along an arc path.

As shown in fig. 7, the length of the opening distance between the blocking portion 43 and the abutted portion 62 is mainly affected by the left and right positions of the adjusting member 9, and 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 clamping member 6 is reduced; conversely, when the adjuster 9 is away from the moving rod 73, the length of the opening distance increases, so that the area of the opening 41 covered by the second clamp 6 increases. The foregoing description and examples are exemplary only, and are not intended to limit the scope of the invention in any way.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. A thread holding mechanism of a sewing machine, comprising:

a supporting plate provided with a first shaft hole and a stop block;

the driving device is connected with the second shaft hole and drives the thread holding piece to deflect, so that the first clamping piece and the second clamping piece sequentially move back and forth between an initial position where the sewing needle is inserted into the opening part, a clamping position where the sewing thread is clamped and a releasing position away from the initial position; and

the driving device drives the wire holding piece to deflect, so that the elastic piece pulls the first clamping piece to rotate, and then the wire holding piece and the first clamping piece can be kept in a closed state to rotate, so that the blocking part pushes the second clamping piece, and further the wire holding piece, the first clamping piece and the second clamping piece can rotate simultaneously;

and in the process that the wire holder continuously deflects, the stop block is clamped against the first clamping piece, so that the opening part and the first clamping arm are separated from each other.

2. The thread holding mechanism of a sewing machine according to claim 1, characterized in that: the wire holder has a fixed axis of constant position and the first clamping member has a movable axis of movement along an arcuate path.

3. The thread holding mechanism of a sewing machine according to claim 2, characterized in that: the second clamping member is also deflected along the fixed axis.

4. The thread holding mechanism of a sewing machine according to claim 1, characterized in that: in the initial position, an opening distance is formed between the blocking part of the wire holding part and the second clamping part.

5. The thread holding mechanism of a sewing machine according to claim 4, characterized in that: the wire holding mechanism further comprises an adjusting piece capable of relative displacement, wherein the adjusting piece abuts against the second clamping piece and is used for changing the length of the opening distance at the initial position.

6. The thread holding mechanism of a sewing machine according to claim 1, characterized in that: the wire holder is further provided with a support portion formed with a flange having a height lower than the opening portion, and when the first clip arm is moved from the release position to the grip position, the first clip arm is supported by the flange and is held at the same height as the opening portion.