JPS6321254Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a stitching width adjustment device for an overlock sewing machine, in which a knife holder equipped with thread sliding pieces can be advanced and retreated using a plurality of parallel shafts oriented left and right with respect to the fabric feeding direction. By attaching the knob to the sewing machine body and connecting the knob to the scalpel holder via a means that converts the rotational force of the knob into the advancing and retreating force of the knife holder, the adjustment setting of the stitching width is synchronized with the setting of the cutting position of the knife. At the same time, the overlocking width and the cutting position with the knife can be determined without using special fixing means to fix the knife holder at the cutting position.
This can be done only by rotating the knob.

When using an overlock sewing machine to sew edges, the thickness of the fabric,
Conventionally, when the overlock width is changed due to the material or use, a needle plate suitable for each overlock width is manufactured and replaced for overlocking work. However, in this case, a new needle plate must be manufactured every time the overlock width is changed, and when various overlock widths are required, a large number of needle plates corresponding to the required widths must be prepared. As a result, the cost of the needle plate is high, and the maintenance and management of a large number of needle plates is required. Furthermore, when using the needle plate, it is troublesome to replace the needle plate every time the overlock width is changed, which impairs the smoothness of the work.

Therefore, an overlocking width adjusting device as described in Japanese Patent Publication No. 55-25875 has already been proposed.
Various sewing widths can be set using the needle plate, but according to the sewing width adjustment device in the above publication, the knife holder is supported on the sewing machine body by a single guide. The fixing force of the scalpel holder to the sewing machine body was not sufficient. For this reason, the guide of the female holder is fixed to the body of the sewing machine by tightening bolts to prevent the sewing width from changing unexpectedly due to vibrations or the like. Therefore, when changing the stitching width, it was necessary to untighten the bolt and then slide the guide to move the female holder. However, the operation required to adjust the stitching width is essentially only moving the knife holder, and the operation of releasing the bolt and tightening the bolt using a screwdriver etc. after adjusting the stitching width is only necessary for moving the knife holder. An operation incidental to movement,
In the overcasting width adjusting device described in the above-mentioned publication, as a result of having to perform this operation, the overcasting width adjustment work still remains troublesome, and the work is not sufficiently smooth.

Also, JP-A-55-78992 and JP-A-Sho.
A stitching width adjusting device having a knob as described in Japanese Patent No. 56-30875 has already been proposed, but all of these devices have the same features as the above-mentioned conventional example.
The structure is such that the overlocking claw with the knife is tightened and fixed with a bolt, and the work of adjusting the overlocking width remains troublesome, resulting in problems such as insufficient smoothness of the work. .

This invention was made in order to solve such conventional problems, and its purpose is to fix the set overburden width by tightening and releasing operations using bolts, etc. Another object of the present invention is to provide an overdarning width adjusting device that does not have a burring width, and an object of the present invention is to provide an overdarning width adjusting device that can be adjusted only by rotating a knob.

That is, this invention, as in the illustrated embodiment, includes a thread support piece 2 formed integrally with the needle plate 1 and oriented in the cloth feeding direction A on the needle drop side thereof, and a thread support piece 2 formed in the same direction as the thread support piece 2. It has a thread sliding piece 3 that is oriented and arranged in parallel with this and is separate from the throat plate 1, and the thread slipping piece 3 is attached to a female holder 11, and the female holder 11 is placed in the cloth feeding direction A. It is attached to the sewing machine body 28 so as to be movable forward and backward by a plurality of parallel shafts 31 and 43 oriented in the left and right directions.
This invention relates to an overlock width adjustment device for an overlock sewing machine, characterized in that the overlock width adjustment device is connected via a means for converting forward and backward force into an overlock sewing machine.

Next, this invention will be explained based on illustrated embodiments.

First, the configuration will be explained. Reference numeral 1 designates a needle plate, and a thread support piece 2 oriented in the cloth feeding direction A is provided on the needle drop side of the needle plate.
is extended, and a thread sliding piece 3 oriented in the same direction as this thread supporting piece 2 is arranged in parallel. A mounting block 4 is integrally connected to the rear end of the thread sliding piece 3, and a movable piece 6 is fixed to the mounting block 4 with a bolt 5.
A finger hook piece 7 is integrally formed at the rear end of the moving piece 6,
This finger hook piece 7 constitutes a movement input section 8.
Positioning holes 9 and 10 are provided in the upper and lower parts of the movable piece 6, respectively. Such a moving piece 6 is
It is attached to the left side surface of the knife holder 11 in the cloth feeding direction A. That is, the surface of the female holder 11 is formed with an oblique guide groove 12 whose upper end is forward in the cloth feeding direction A and whose lower end is backward in the same direction A, and the movable piece 6 is engaged with this guide groove 12 so as to be able to move forward and backward. match.
Furthermore, a press plate 13 is arranged on the surface of the movable piece 6 opposite to the female holder 11. Presser plate 13
is fixed to the female holder 11 by bolts 14 and 15, and presses the movable piece 6 so that it does not come off the guide groove 12. A leaf spring 17 is fixed to the presser plate 13 with bolts 16, and a ball 19 is arranged in the through hole 18.
is biased by the plate spring 17 to move the ball 19 to the moving piece 6
to press against. The ball 19 engages with the hole 10 of the moving piece 6 when the moving piece 6 is ascending, and engages with the hole 9 when the moving piece 6 is descending.
, and positions the movable piece 6 at the raised position (the working position of the thread sliding piece 3 as described later) and the lowered position (the non-working position) of the moving piece 6.

Also on the right side of the knife holder 11 in the cloth feeding direction A.
A mounting groove 20 having an inclination of approximately 45 degrees is formed, with the upper end facing forward in the cloth feeding direction A and the lower end facing backward in the same direction A, and the lower knife 21 engages with this groove 20. The lower knife 21 is pressed and fixed in the mounting groove 20 by a knife holder 23 that is fixed to the knife holder 11 with a bolt 22 . At this time, the right edge of the lower knife 21 and the right edge of the thread sliding piece 3 are substantially on the same line in the cloth feeding direction A. Moreover, on the upper side of the female holder 11,
The pointer 25 is fixed by the bolt 24, and the pointer 2
The tip of 5 faces the scale 26 of the throat plate 1. Scale 26
is displayed on a transparent transparent plate 27 formed on the throat plate 1, and the pointer 2 is displayed on the lower surface of this transparent plate 27.
5 points toward the scale 26 that indicates the current overlocking width dimension.

Reference numeral 28 indicates a sewing machine body, in which a metal bush 30 serving as a bearing is fixed to the sewing machine body 28 with a bolt 51 in a horizontal hole 29 perpendicular to the cloth feeding direction A.
penetrates freely. A collar 33 is fixed to the left end of the operating shaft 31 in the cloth feeding direction A with a bolt 32 in contact with the left end surface of the bush 30, and
On the right end surface of the same direction A of 0, the retaining ring 3 is attached to the operating shaft 31.
4 to prevent the operating shaft 31 from coming off. A thread groove 35 is formed on the right side of the operating shaft 31 in the cloth feeding direction A from the bush 30, and is engaged with the female thread 36 of the female holder 11. At the right end of the operation shaft 31, there is a circular knob 37 on the right side of the female holder 11.
is fixed with the stepped bolt 38, and the knob 37 is
The surface is covered with a decorative board 39. The operating shaft 31 and the knob 37 are provided with concave and convex portions that fit into each other at their ends, so that the two always rotate together. A display 40 indicating the direction of rotation of the knob 37 is provided on the decorative board 39. Further, a compression coil spring 41 is fitted onto the operating shaft 31 between the retaining ring 34 and the female holder 11 to constantly urge the female holder 11 to the right.

Further, in the sewing machine body 28, a support shaft 43 is inserted through a hole 42 parallel to the hole 29 so as to be freely advanced and retracted.
A bolt 44 is attached to the left end of the support shaft 43 in the cloth feeding direction A.
The collar 45 is fixed and serves as a stopper against rightward movement of the support shaft 43. Support shaft 4
A thread groove 46 is formed at the right end of 3, and is screwed into the female thread 47 of the female holder 11. Thus, the knife holder 11 is supported by the operating shaft 31 and the support shaft 43 with respect to the sewing machine body 28.

In the figure, 48 is the bed of the sewing machine, 49 is a stopper bolt, and 50 is a knife receiving portion of the throat plate 1. The stopper bolt 49 is screwed onto the female holder 11, and at the lowering end of the movable piece 6, the movable piece 6 hits the head of the stopper bolt 49 to prevent the movable piece 6 from further lowering. Further, the knife receiving part 50 supports the upper end of the lower knife 21 from below, and shares the load of the lower knife 21.

Next, the effect will be explained.

In this description, the front, back, top, bottom, left, and right directions refer to the cloth feeding direction A as the front. The width of the overlocking is as follows:
It is determined by the width between the left side of the yarn support piece 2 and the right side of the yarn slide piece 3 at the working position shown by the solid line. Then,
By moving the thread slip piece 3 in the left and right direction,
The stitch width can be adjusted. This overlocking width adjustment is performed by rotating the knob 37. The width of the stitch formed using the yarn support piece 2 and the yarn slipping piece 3 can be adjusted between 2.5 mm and 5.0 mm. That is, it can be understood from the display 40 of the knob 37 that rotating the knob 37 increases the stitching width, and rotating the knob 37 to the left decreases the stitching width.

Therefore, when the knob 37 is rotated in either direction, the operating shaft 31 rotates together with the knob 37.
Female holder 1 screwed into thread groove 35 of operating shaft 31
1 moves to the left or right. The operating shaft 31 is
The retaining ring 34 and the collar 33 allow only rotational movement without axial movement. Thus, the operation shaft 31 that performs only rotational movement and the knife holder 11 screwed into its thread groove 35 constitute a means for converting the rotational force of the knob 37 by the advancing and retreating force of the knife holder 11. Due to the movement of the knife holder 11, the support shaft 43 moves together with the knife holder 11, but when the knife holder 11 moves to the right, the collar 45 moves at the limit of its movement.
hits the sewing machine body 28 and stops the knife holder 11 from moving to the right. Thus, the scalpel holder 11 is always supported by the sewing machine body 28 by the operating shaft 31 and the support shaft 43.

As the knife holder 11 moves, the movable piece 6 also moves to the left and right, so the thread sliding piece 3 is moved as well, and the stitching width can be adjusted. and,
Since the female holder 11 is always biased to the right by the compression coil spring 41, even if there is some play in the threaded engagement between the operation shaft 31 and the female holder 11, no play will occur in the female holder 11. do not have. As the knife holder 11 moves, the lower knife 21 also moves together with it, so the relative position between the lower knife 21 and the thread slide piece 3 does not change. Therefore, the cutting position of the cloth also changes in accordance with the change in the stitching width. Note that the lower knife 21 is supported by the knife receiving portion 50 of the throat plate 1 on the front side of the upper end, so that the downward load input to the lower knife 21 when cutting cloth is also absorbed by the throat plate 1. Shared support will be given. Therefore, the lower knife 21 and the knife holder 11 are not shaken.

Moreover, it is also possible to sew the edges using only the thread supporting piece 2 without using the thread slipping piece 3. Since this is a hem seam based only on the width dimension of the thread support piece 2, it becomes an extremely thin hem seam. At this time, the thread sliding piece 3 is moved backward and downward, which is the inactive position. This movement is performed by hooking a finger on the finger hook 7, which is the movement input section 8 of the moving piece 6, and pulling it backward and downward.
Then, the movable piece 6 descends along the guide groove 12, and when the hole 9 of the movable piece 6 reaches the position of the ball 19, the ball 19 falls into the hole 9 due to the biasing force of the leaf spring 17, and the movable piece Stop 6. This is the position shown by the chain line in FIG. 1, where the thread sliding piece 3 is also lowered together with the movable piece 6. This is the inactive position.

Here, when performing the ultra-fine hem,
By rotating the knob 37, the knife holder 11 is moved to the left end, and the lower knife 21 is brought closest to the throat plate 1. This allows the cloth cutting position to be adjusted to the thread supporting piece 2.
Make the overlock stitch very thin on the right side edge. Similarly, when the knife holder 11 is moved to the right by rotating the knob 37 with the yarn slider 3 in the inactive position, the cloth is cut even though the stitching width is extremely thin. Since the width is increased, the cloth is wrapped around the thread support piece 2 and hemmed. This is the so-called overlock stitch. Thus, according to this embodiment, in addition to being able to adjust the stitching width,
Even overlock stitching is possible only by rotating the knob 37 and moving the movement input section 8.

Note that the knob 37 referred to in this invention is not limited to this embodiment, and can of course be applied to cases where it is rotated by a tool such as a screwdriver. is not necessarily limited to the round shape shown in the figure.

As explained above, according to the present invention, the scalpel holder is attached to the sewing machine body so as to be movable forward and backward by a plurality of parallel shafts oriented in the left and right directions with respect to the cloth feeding direction. Even if there is a downward input to the knife holder, the knife holder is supported by multiple shafts, so
It does not swing relative to the sewing machine body. Also,
Similarly, the scalpel holder is securely held in the sewing machine body even against vibrations caused by high-speed sewing operations. Therefore, there is no need for tightening means such as bolts to support the knife holder on the sewing machine body, so when moving the knife holder left and right with respect to the fabric feeding direction to adjust the sewing width, With this, you can immediately start sewing by simply rotating the knob without tightening or releasing bolts or the like. Therefore, it has become extremely easy to adjust the stitching width.

[Brief explanation of drawings]

FIG. 1 is a right side view showing an embodiment of this invention;
Figure 2 is the same plan view, Figure 3 is the - of Figure 1.
A line sectional view, FIG. 4 is a - line sectional view of FIG. 2,
FIG. 5 is a sectional view taken along the - line in FIG. 1, and FIG.
FIG. 1 is an exploded perspective view showing an embodiment of this invention. In addition, in the figure, A indicates the cloth feeding direction, 1 indicates the throat plate, 2 indicates the thread support piece, 3 indicates the thread slide member, 11 indicates the knife holder, 28 indicates the sewing machine body, 31 indicates the shaft (operating shaft), 37 indicates the knob,
43 is a shaft (support shaft).

Claims (1)

[Scope of utility model registration request] A thread support piece integrally formed with the needle plate and oriented in the cloth feeding direction on the needle drop side thereof, and a thread support piece oriented in the same direction as the thread support piece and arranged in parallel therewith, and separate from the throat plate. The thread sliding piece is attached to a female holder, and the female holder is attached to the sewing machine body so as to be movable forward and backward by a plurality of parallel shafts oriented in the left and right directions with respect to the cloth feeding direction. An overlock width adjusting device for an overlock sewing machine, characterized in that a knob is connected to the knife holder via means for converting the rotational force of the knob into a force for advancing and retracting the knife holder.