JPS63224Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an overlock width display device for an overlock sewing machine, and in particular, it uses a transparent transparent plate attached to the throat plate or sewing machine bed to display a scale or a scale indicating the overlock width. The tip of an arm attached to the thread slide or a member that moves together with it is attached to the lower side of the transparent plate, and the scale or indicator is attached to the tip of the arm. The present invention relates to a display device which does not interfere with the operation of a sewing machine and whose scale is easy to read.

As a conventional overlock width display device for an overlock sewing machine, there is one described, for example, in Japanese Patent Application Laid-open No. 120060/1983. In other words, in this conventional example, a knife holder (overlock claw) with a thread slipper fixed at the tip and a knife fixed in the middle is attached to the throat plate so as to be movable in the left and right directions with respect to the cloth feeding direction, and the rear end of the knife holder is A protruding portion was formed to protrude to the right from the throat plate, and a scale was attached to the upper surface of this protruding portion. A part of the overhang is in contact with the lower surface of the throat plate,
A part of the scale on the overhang part was hidden under the bottom surface of the throat plate in response to changes in the stitching width, and the stitching width was read from the scale exposed from the throat plate.

However, according to such conventional examples, the scale is attached to the protrusion at the rear end of the female holder,
Since the overhang extends far to the right from the throat plate, there is a problem that this obstructs the operation of the sewing machine.Also, if this overhang is made smaller, the scale becomes smaller, making it difficult to read the scale. be. In addition, according to the conventional example, a part of the scale is hidden under the throat plate, and it is necessary to read the scale only from the scale exposed from the throat plate, so it is easy to understand the context of the displayed scale. There is a serious problem.

This invention was made in order to eliminate such conventional problems, and its purpose is to provide a display device that does not get in the way of sewing machine operation, and its purpose is to provide an easy-to-read display device. The goal is to provide equipment.

That is, as in the illustrated embodiment, the thread support piece 2 is integrated with the throat plate 1 mounted on the sewing machine bed 48 and is formed on the needle drop side of the throat plate 1 so as to be oriented in the cloth feeding direction A. and a yarn sliding piece 3 which is oriented in the same direction as the thread supporting piece 2 and arranged in parallel with it and is separate from the throat plate 1, and the thread sliding piece 3 is oriented in the cloth feeding direction A.
The sewing machine body 28 is movable in the left and right direction.
In the overlock sewing machine configured to be attached to the sewing machine to adjust the overlock width formed by the thread support piece 2 and the thread sliding piece 3, a transparent plate 27 for brightening is attached to the throat plate 1 or the sewing machine bed 48, The tip of the arm 25 is made to face the transparent plate 27 from below the needle plate 1 or the sewing machine bed 48, and
The base end of this arm 25 is attached to the thread sliding piece 3 or a member that moves together with this, and the arm 25
An overlocking width display for an overlock sewing machine, characterized in that a scale 26 indicating the overlocking width is attached to one of the tip and the transparent plate 27, and an indicator 25a indicating the scale 26 is attached to the other side. Related to equipment.

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 holds down 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).

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,
An arm 25 is fixed by a bolt 24, and the tip of the arm 25 faces the scale 26 of the throat plate 1. Scale 2
6 is a transparent plate 27 formed on the throat plate 1;
The tip of the arm 25 faces the lower surface of the transparent plate 27, and the indicator 25a attached to the tip
indicates the scale 26 that displays the current overlocking width dimension. How to attach the scale 26 to the transparent plate 27 is to attach the scale 26 to the transparent synthetic resin sheet 2 on which the scale 26 is written.
This is done by adhering 6a to the lower surface of the transparent plate 27.

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 screwed into 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 of the panel 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 a sewing machine bed, 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 operation will be described.

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:
The width 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 in the use 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 when the knob 37 is rotated clockwise, the stitching width becomes larger, and when the knob 37 is rotated counterclockwise, the stitching width becomes smaller.

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.

Due to the movement of the knife holder 11, the movable piece 6 also moves to the left and right, so the thread sliding piece 3 also moves in the same way, so that 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 slip 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, since the front side of the upper end of the lower knife 21 is supported by the knife receiving portion 50 of the throat plate 1, the downward load input to the lower knife 21 when cutting the cloth is
It is also supported by the throat plate 1. Therefore,
No rattling of the lower knife 21 or rattling of the knife holder 11 occurs.

When the scalpel holder 11 moves left and right as described above, the arm 25 whose rear end is fixed to the scalpel holder 11 also moves together, and the index 25a at the tip of the arm 25 similarly moves left and right along the scale 26. . Therefore, by reading the scale 26 indicated by the indicator 25a, the current stitching width formed by the thread support piece 2 and the thread sliding piece 3 can be immediately known. Also,
In this embodiment, the arm 25 extends from the knife holder 11 to the transparent plate 27 along the lower surface of the throat plate 1, so that it does not interfere with each moving part of the sewing machine. Furthermore, according to this embodiment, since the tip of the arm 25 only faces the lower side of the transparent plate 27,
Since the light rays taken in from the transparent plate 27 are not significantly blocked, the brightening function of the transparent plate 27 is hardly reduced.

In this embodiment, the thread slip piece 3 and the lower knife 21 are each attached to the knife holder 11, and the arm 25 having the indicator 25a is attached to the knife holder 11. However, the thread slip piece 3 and the lower knife 21 are attached separately from the lower knife. Even if the arm 25 is attached to the thread sliding piece, the scale indicated by the index 25a of the arm 25 can be read.

The darning width adjustment described above is an adjustment of the darning width using the thread support piece 2 and the thread slipping piece 3.
It is also possible to overlock using only the thread support piece 2 without using the thread support piece 2. 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, moving piece 6
descends along the guide groove 12 and enters the hole 9 of the moving piece 6.
When the ball 19 reaches the position of the ball 19, the ball 19 falls into the hole 9 by the biasing force of the leaf spring 17, and the movable piece 6 is stopped. 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 is of course not limited to this embodiment, and may of course be applied to cases where it is rotated by a tool such as a screwdriver.
Furthermore, the shape of the knob 37 is not necessarily limited to the round shape shown in the figure.

Further, in this embodiment, the scale 26 is attached to the transparent plate 27, but the width dimension of the tip of the arm 25 is slightly expanded left and right and the scale 26 is attached thereto.
7 can also be provided with an index 25a. moreover,
As a means for marking the scale 26 on the transparent plate 27, the scale 2
A transparent synthetic resin sheet 26a marked with 6 is glued to the transparent plate 27, and the scale 26 is
You can also enter directly in 7. Furthermore, it goes without saying that the rear end of the arm 25 may be attached not only to the female holder 11 but also to the presser plate 13, the support shaft 43, etc. as long as it moves in the left-right direction integrally with the female holder 11.

As explained above, according to this invention, a stitching width display device is constructed by using a transparent plate with a light screen and an arm that moves integrally with the thread sliding piece with its tip facing the lower side of the transparent plate. . Therefore, the stitching width display device does not appear on the right side or above the throat plate, so it does not interfere with the operation of the sewing machine. In addition, the entire scale can be seen from the top of the transparent plate, and the position of the index within the entire scale can be confirmed, making it easier to read the scale. This has the effect of making it possible to read the scale intuitively just by the position indicated by the index without having to read the numbers.

[Brief explanation of drawings]

FIG. 1 is a right side view showing an embodiment of this invention;
Fig. 2 is the same plan view, and Fig. 3 is the − of Fig. 2.
A line sectional view, FIG. 4 is a - line sectional view of FIG. 1,
FIG. 5 is a sectional view taken along the - line in FIG. 2, and FIG.
FIG. 1 is a sectional view taken along the line --, and FIG. 7 is an exploded perspective view showing an embodiment of this invention. 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, 25 indicates the arm, 25a indicates the index, 26 indicates the scale, 27 indicates the transparent plate, 28 indicates the sewing machine body, and 48 is a sewing machine bed.

Claims (1)

[Scope of utility model registration request] A thread support piece is integrally formed with the throat plate attached to the sewing machine bed and is formed on the needle drop side of the needle plate so as to be oriented in the fabric feeding direction, and a thread support piece is provided in parallel with the thread support piece and oriented in the same direction as the thread support piece. and a thread sliding piece that is separate from the throat plate, and the thread sliding piece is mounted on the sewing machine body so as to be movable in the left and right directions with respect to the cloth feeding direction, and the thread supporting piece and the thread In an overlock sewing machine configured to adjust the stitch width formed by the sewing piece, a transparent transparent plate is attached to the throat plate or the sewing machine bed, and the end of the arm is attached to the transparent plate from the underside of the throat plate or sewing machine bed. and attaching the proximal end of this arm to the thread sliding piece or a member that moves together with it, and attaching a scale indicating the stitching width to either the tip of the arm or the transparent plate, An overlock width display device for an overlock sewing machine, characterized in that an index indicating the scale is attached to the other side.