JPH0142717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a needle clamp device for a sewing machine for sewing cloth, leather, etc.

(Prior Art) A conventional needle clamp device for an industrial sewing machine is composed of a sewing machine needle 18, a needle bar 28, and a needle bar thread hook 40, as shown in FIG. 6, a vertical cross-sectional view thereof. .
This sewing machine needle 18 has a threading hole 181 at its pointed end, and the other end 183 on the opposite side of the pointed end is shaped like a round bar. The needle bar 28 has a holding hole 281 having a circular cross section through which the other end 183 of the sewing machine needle 18 is inserted;
A tap hole 283 intersecting this holding hole 281 from the normal direction and having a female thread carved therein, this tap hole 28
It has a set bolt 288 at the tip of the recess that is screwed into the needle bar arm 90 of the sewing machine, and is held movably up and down on the needle bar arm 90 of the sewing machine. Normally, the needle bar 28 is fixed to a sewing machine needle bar arm 90. The needle bar thread hook 40 is
It is ring-shaped with a skirt portion 401 having a threading hole 403, and the ring-shaped inner circumferential surface 405 fits and holds the outer circumferential surface 287 of the needle bar.

When sewing with this sewing machine, insert the sewing machine needle 18 until the other end 183 hits the deep part of the holding hole 281, and then connect the tip of the hook of the sewing machine body to the threading hole 181 of the sewing machine needle. Rotate the sewing machine needle so that it is at a specified angle,
The needle bar 28 and sewing machine needle 18 are fixed with a set bolt 288.

(Problems to be Solved by the Invention) By the way, the direction of the threading hole 181 is determined as follows.
A considerable degree of orientation accuracy is required, and since the other end 183 of the sewing machine needle 18 is in the shape of a round bar, a considerable amount of skill is required to accurately set the sewing machine needle 18 on the needle bar 28. Sometimes, when fixing the sewing machine needle 18 with the set bolt 288, this orientation changes slightly. In other words, since it is difficult to set the sewing machine needle 18, the efficiency of the sewing operation may be reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sewing machine needle stop device that allows even a beginner in sewing work to easily set a sewing machine needle.

[Structure of the Invention] (Means for Solving the Problems) The needle locking device for a sewing machine according to the first aspect of the present invention has a pointed end portion having a threading hole, and a notch-shaped end portion on the opposite side of the pointed end portion. A sewing machine needle having an engaging portion, a holding hole through which the other end of the sewing machine needle is inserted, a pin hole that intersects with the holding hole, and a pin hole that is inserted through the pin hole and engages with the notch-like engaging portion of the sewing machine needle. The sewing machine needle bar has an engaging pin that is biased in the mating direction, and is held in a sewing machine needle bar arm so as to be movable up and down, and the other end of the sewing machine needle is inserted into the holding hole of the needle bar. The sewing machine needle is fixed to the needle bar by inserting the sewing machine needle through the sewing machine needle and engaging the engagement pin with the notch-like engagement portion provided at the other end.

That is, the needle locking device for a sewing machine according to the first aspect of the present invention comprises: a sewing machine needle having a notch engaging portion so that the direction of the threading hole can be set in a specific direction; a holding hole through which the other end of the sewing machine needle is inserted; It is composed of a pin hole that intersects with the holding hole, and a needle bar having an engaging pin that is biased in a direction to engage the notch-like engaging portion.

The notch-like engagement portion provided at the other end of the sewing machine needle is a portion that engages with the circumferential surface of an engagement pin, which will be described later. This notch-like engagement portion may have any shape as long as it is a recess formed on the outer peripheral surface of the sewing machine needle. As this notch-like engagement part, for example, a V-cut shape, a crescent moon shape, an arc shape, a plane formed when cut by a plane including an arbitrary chord and a plane perpendicular to the outer circumferential surface, etc. can be used. In order to improve the workability of attaching and replacing the sewing machine needle, it is desirable that the sewing machine needle has a ring-shaped stopper on its outer circumferential surface that has a guide surface that is in a predetermined positional relationship with the threading hole. When this stopper is set on the sewing machine needle,
The insertion depth when inserting the sewing machine needle into the holding hole can be easily and accurately positioned. Therefore, it is possible to set or replace the sewing machine needle, for example, by a robotic device. This is because the fingers of the robot device can easily and reliably grip the outer peripheral surface of the stopper. That is, by holding the stopper on the sewing machine needle, it becomes easy to realize an automatic sewing machine needle exchange system.

The needle bar includes a holding hole through which the end of the sewing machine needle is inserted, a pin hole that intersects with the holding hole, and an engagement member that is inserted through the pin hole and urged in a direction to engage with the notch-like engagement portion of the sewing machine needle. This is a member that has a pin and is held in the sewing machine needle bar arm so that it can move up and down.

The pin hole provided in this needle bar is provided so as to intersect with the holding hole. The crossing angle may be any angle, and the depth of crossing (degree of interference) needs to be set depending on the mutual relationship between the notch-like engaging portion and the engaging pin.

Although the cross-sectional shape of the engagement pin is also related to this pin hole, it is preferable that the cross-section is circular. However, any shape such as an elliptical cross section or a rectangular cross section can be used for these shapes. Further, the cross-sectional shape of the pin hole and the engaging pin is preferably a straight shape that does not change in the longitudinal direction. Alternatively, these may have a tapered shape in which the cross-sectional shape becomes larger or smaller in the longitudinal direction.

When the engagement pin urges the notch-like engagement portion, it is desirable that the engagement pin slides in the direction of its longitudinal axis. Alternatively, the direction of movement of these may be a direction of rotation around the longitudinal axis. Further, it is preferable that the needle bar holds a needle bar thread hook on its outer circumferential surface, which has a threading hole for guiding the thread to the threading hole of the sewing machine needle. Further, the needle bar and the sewing machine needle may be integrally fixed.

A needle locking device for a sewing machine according to a second aspect of the present invention includes a sewing machine needle having a pointed end portion having a threading hole, a notch-like engagement portion at the other end opposite to the pointed end portion, and other parts of the sewing machine needle. a holding hole through which the end portion is inserted; an extrusion plunger inserted into the holding hole and engaged with either the sewing machine needle or the engagement pin so as not to fall out of the holding hole and to be urged downward; It has a pin hole that intersects with the holding hole, and an engaging pin that is biased in the direction of engaging with the notch-like engaging portion of the sewing machine needle that is inserted through the pin hole, and is movable up and down on the needle bar arm of the sewing machine. The other end of the sewing machine needle is inserted into the holding hole of the needle bar, and the engagement pin is inserted into the notch-like engagement portion provided at the other end. to fix the sewing machine needle to the needle bar, and when removing the sewing machine needle from the needle bar, push the engagement pin, and then remove the sewing machine needle by the downward biasing force of the push-out plunger. When the sewing machine needle is not inserted through the needle bar, the push-out plunger prevents the engaging pin from moving in the radial direction.

Note that the needle bar arm holding the first invention device and the second invention device can be used as they are in the conventional shape or with some changes.

(Function) The sewing machine needle stop device of the first invention includes a sewing machine needle having a notch-like engagement portion so that the direction of the threading hole can be set in a specific direction, and a holding device for inserting the other end of the sewing machine needle. The needle bar includes a hole, a pin hole that intersects with the holding hole, and a needle bar having an engaging pin that is biased in a direction to engage the engaging portion.

Therefore, when attempting to perform sewing work, first insert the other end of the sewing machine needle into the holding hole of the needle bar, and engage the engagement pin with the notch-shaped engagement portion provided at the other end. Fix the sewing machine needle to the needle bar. At this time, since the threading hole of the sewing machine needle and the notch-like engagement part are formed in a predetermined positional relationship, the threading hole can be set at the optimal position with respect to the tip of the hook of the sewing machine body. become.

For example, the sewing machine needle can be set or replaced by a robot device. Therefore, the sewing machine needle can be set or replaced quickly and accurately.

In addition, since the needle stopper device of the sewing machine according to the second invention has a push-out plunger added to the needle stopper device of the sewing machine according to the first invention, when removing the sewing machine needle from the needle bar, it is necessary to press the engagement pin before removing the sewing machine needle from the needle bar. The downward biasing force of the push-out plunger facilitates the removal of the sewing machine needle, and when the sewing machine needle is not inserted through the needle bar, the push-out plunger prevents the engagement pin from moving in the radial outward direction.

(Example) Hereinafter, the sewing machine needle stop device of the first invention and the second invention will be described based on a specific first example.

In the first embodiment, the state before the sewing machine needle is attached to the needle bar is shown in the longitudinal sectional view of FIG. 1, and the state in which the sewing machine needle is attached to the needle bar is shown in the longitudinal sectional view of FIG.

That is, the needle stop device of this sewing machine is
, a needle bar 20, a stopper 30, and a needle bar thread hook 40.

The sewing machine needle 10 has a threading hole 10 in the pointed end 101.
3 and the other end 10 on the opposite side of this pointed end 101.
5 has a notched engagement portion 109. This notched engagement portion 109 is manufactured by additional processing in the manufacturing process of a conventional round bar-shaped sewing machine needle. That is, the other end portion 105 is provided with a notch-like engagement portion 109 which is formed so that the remaining flesh portion after being pressed from the end surface 107 toward the pointed end portion 101 side has a half-moon shape. This notched engagement portion 109 is a portion that engages with an engagement pin 25, which will be described later. Further, key groove-shaped recesses 111 each having a length of 2 mm are formed by pressing on both sides of the center at a position 12.5 mm from this end surface 107. This recess 111 is a surface on which a set bolt 309 abuts a positioning stopper 30, which will be described later.

The needle bar 20 includes a needle bar base 21 and this needle bar base 2.
The needle holder 23 is connected to the needle holder 1 by a screw structure, and an engagement pin 25 is held by the needle holder 23.

The needle bar base body 21 has a round bar shape cut to a fixed size, and has a deep hole 215 formed in the center from one end surface 211 into which a return coil spring 213 is inserted. A larger tap pilot hole is drilled and a female thread 217 is threaded into this pilot hole.

The needle holder 23 has a stepped round bar shape, and has a holding hole 231 in its center that passes through both sides and into which the sewing machine needle 10 is inserted, and has a hole 231 for the coil spring 213 to escape from the end face of the small diameter part. A deep hole 233 with a larger outer diameter than this is formed, and then a male screw 235 is formed to be screwed into the female screw 217 of the smaller diameter portion,
A pin hole 237 is formed in the large diameter portion, perpendicularly intersecting with the holding hole 231 and passing through the large diameter portion.
A push-out plunger 239 is inserted into the deep hole 233 and is biased downward by a spring 213 and has a tapered tip and is pushed out downward when removing the sewing machine needle 10. .

The details of the engagement pin 25 are shown in the arrow view A-A in FIG.
This is shown in FIG. 3, which shows a cross section of the holder 23 as seen from above. This engagement pin 25 has a disk-shaped collar 2 on one end surface which serves as a spring holder for the coil spring 251.
53, with a sewing machine needle 1 in the center of the round shaft.
A rounded notch 255 formed with an end mill larger than the radius of 0 and whose side opposite to the collar 253 is smoothly cut off, and a tapered surface notch 25 that follows this.
I have 6. This tapered surface notch 256 is
This is provided to be effective when the aforementioned notch-like engagement portion 109 is in contact with the engagement pin 25 and the collar 253 of the engagement pin 25 is pushed to remove the sewing machine needle 10 from the needle bar 20.

The stopper 30 has a thick ring shape, has a through hole 301 in the center through which the sewing machine needle 10 is inserted, and has both end surfaces 30 formed so as to guide the thread to the threading hole.
3, 305 are tied together to form a square groove 307 with a tapered depth, a prepared screw hole is formed that penetrates from the outer peripheral surface facing the square groove 307 to the central through hole 301, and a set bolt 309 is screwed into this prepared hole. female screw 31
This is a screw-engraved version of 1.

A conventional needle bar thread hook 40 is used as is.

In addition, sewing machine needle 10, needle bar 20, stopper 3
0, the relative positional relationship of the needle bar thread hook 40 is shown in the arrow view of FIG.

The sewing machine needle stop device constructed as described above is used in the following manner.

Usually, a needle bar 20 is held by a needle bar arm 90 so as to be able to move up and down, and a needle bar thread hook 40 is attached to this needle bar 20. When performing sewing work, insert the other end 10 of the sewing machine needle 10 into the holding hole 231 of the needle bar 20.
5 is inserted, and the engagement pin 25 is engaged with the notch-like engagement portion 109 provided at the other end 105, thereby fixing the sewing machine needle 10 to the needle bar 20. At this time, since the threading hole 103 of the sewing machine needle 10 and the notch-like engagement portion 109 are formed in a predetermined positional relationship, the threading hole 103 is in the optimal position with respect to the tip of the hook of the sewing machine body. will be set.

Also, when removing the sewing machine needle 10 from the needle bar 20,
When the engagement pin is pushed in the direction of deflecting the coil spring 251, the biasing force on the sewing machine needle 10 is weakened by the rounded notch 255, and the sewing machine needle 1 is easily pushed.
0 is removed.

According to the first embodiment, the needle stop device of the sewing machine is composed of the sewing machine needle 10 having the notched engagement portion 109, the needle bar 20 having the engagement pin 25, the stopper 30, and the needle bar thread hook 40. With this configuration, the threading hole 103 of the sewing machine needle can be inserted by rotating the sewing machine needle as in the conventional case.
There is no need to determine the direction so that the sewing machine and the tip of the hook of the sewing machine body form a predetermined angle. Therefore, even a person who is not skilled in setting sewing machine needles can easily set the sewing machine needle 10 in a short time. That is, the productivity of sewing work is improved.

Next, a second embodiment will be described.

The second embodiment is based on the needle bar base 2 in the first embodiment.
1. Using a needle bar 24 with an integrated needle holder 23,
The return spring 213, extrusion plunger 239, etc. are excluded. Other configurations are
This is almost the same as the first embodiment. The state in which the sewing machine needle 10 is attached to the needle bar 24 is shown in the longitudinal sectional view of FIG.

The method of use and operation of the needle stopper device of the second embodiment of the sewing machine are substantially the same as those of the first embodiment, and therefore a description thereof will be omitted.

In this second embodiment as well, the same effects as in the first embodiment can be obtained.

[Effects of the Invention] According to the first invention, the needle stop device of a sewing machine includes a sewing machine needle having a pointed end portion having a threading hole and a notch-like engagement portion at the other end portion on the opposite side of the pointed end portion. a holding hole through which the other end of the sewing machine needle is inserted, a pin hole that intersects with this holding hole, and an engaging pin that is inserted through the pin hole and is urged in a direction to engage the notch-like engaging portion of the sewing machine needle. The needle bar is held by the sewing machine needle bar arm in a vertically movable manner, so that when sewing is to be performed, the other end of the sewing machine needle is first inserted into the holding hole of the needle bar, and then The sewing machine needle is fixed to the needle bar by engaging the engagement pin with the notch-like engagement portion provided at the end. Alternatively, you may have one in which the sewing machine needle and needle bar are already integrated. At this time, since the threading hole of the sewing machine needle and the notch-like engagement part are formed in a predetermined positional relationship, the threading hole is set at the optimal position with respect to the tip of the hook of the sewing machine body. Become.

In other words, unlike conventional sewing machines, there is no need to determine the direction between the tip of the hook on the sewing machine and the threading hole of the sewing machine needle, so even people who are not experienced in setting sewing machine needles can easily set the sewing machine needle in a short time. can. That is, the productivity of sewing work is improved.

For example, the sewing machine needle can be set or replaced by a robot device.
This is because when a ring-shaped stopper is set on the sewing machine needle, the fingers of the robot device can easily and reliably grip the stopper (sewing machine needle) on the outer peripheral surface of the stopper.

According to the second invention, the needle stop device of the sewing machine is
By adding an extrusion plunger to the needle stop device of the sewing machine of the invention, when removing the sewing machine needle from the needle bar, after pushing the engagement pin, the sewing machine needle can be easily removed by the downward biasing force of the extrusion plunger, and the sewing machine When the needle is not inserted into the needle bar, the push-out plunger can prevent the engaging pin from moving in the radial direction.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a sewing machine needle stop device according to a first embodiment of the present invention before the sewing machine needle is attached to the needle bar, and FIG. FIG. 2 is a longitudinal cross-sectional view showing a state in which a sewing machine needle according to one embodiment is attached to a needle bar. FIG. 3 is a cross-sectional view of the holding body 23 in the first embodiment as seen from arrow AA. FIG. 4 is a view showing the relative positional relationship among the sewing machine needle 10, needle bar 20, stopper 30, and needle bar thread hook 40 in FIG. 2 when viewed from the direction of arrow C (direction of the tip of the sewing machine needle) . FIG. 5 is a longitudinal sectional view showing the sewing machine needle 10 attached to the needle bar 24 in the second embodiment. FIG. 6 is a longitudinal cross-sectional view of a needle stop device for a sewing machine used to explain a conventional needle stop device for a sewing machine. 10...Sewing machine needle, 101...Threading hole, 109...
Notch-like engagement portion, 20... Needle bar, 21... Needle bar base, 2
3... Needle holder, 231... Holding hole, 237... Pin hole, 25... Engagement pin, 30... Stopper, 40...
Needle bar thread hook.

Claims (1)

[Scope of Claims] 1. A sewing machine needle having a pointed end having a threading hole, and a notch-like engagement part at the other end opposite to the pointed end, through which the other end of the sewing machine needle is inserted. The needle bar arm of the sewing machine has a holding hole, a pin hole that intersects with the holding hole, and an engaging pin that is biased in a direction to engage with the notch-like engaging portion of the sewing machine needle that is inserted through the pin hole. and a needle bar held movably up and down in the needle bar, the other end of the sewing machine needle is inserted into the holding hole of the needle bar, and the other end of the sewing machine needle is inserted into the notch-like engagement portion provided at the other end. A needle stop device for a sewing machine, characterized in that the sewing machine needle is fixed to the needle bar by engaging the engagement pin. 2. The needle stop device for a sewing machine according to claim 1, wherein the needle bar holds a needle bar thread hook. 3. The sewing machine needle stop device according to claim 1, wherein the sewing machine needle holds a ring-shaped stopper on its outer peripheral surface having a guide surface in a predetermined positional relationship with the threading hole. 4. The needle stop device for a sewing machine according to claim 1, wherein the needle bar and the sewing machine needle are integrally fixed. 5. A sewing machine needle having a pointed end with a threading hole, a notch-like engagement part at the other end opposite to the pointed end, a holding hole through which the other end of the sewing machine needle is inserted, and the holding hole. an extrusion plunger that is inserted into the holding hole and engaged with either the sewing machine needle or the engagement pin so as not to fall off and is urged downward; a pin hole that intersects with the holding hole; and a pin hole that intersects with the holding hole; a needle bar having an engagement pin biased in a direction to engage with the notch-like engagement portion of the sewing machine needle inserted through the needle bar, and a needle bar held movably up and down in the needle bar arm of the sewing machine; The other end of the sewing machine needle is inserted into the holding hole of the needle bar, and the notch-like engagement portion provided at the other end is engaged with the engagement pin, so that the sewing machine needle is inserted into the needle. When the sewing machine needle is fixed to a rod and removed from the needle bar, after pushing the engagement pin, the downward urging force of the push-out plunger facilitates the removal of the sewing machine needle, and the sewing machine needle is removed from the needle bar. 1. A needle stop device for a sewing machine, characterized in that the push-out plunger prevents the engagement pin from moving in a radial outward direction when the engagement pin is not inserted into the needle.