JPH0131171Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a sewing machine needle clamping device for sewing machines that sew 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. 7 in a vertical cross-sectional view. .
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 with a circular cross section through which the other end 183 of the sewing machine needle 18 is inserted, a tap hole 283 which intersects this holding hole 281 from the normal direction and has a female screw thread, and this tap hole 283.
It has a set bolt 288 with a concave tip 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. The needle bar thread hook 40 is ring-shaped with a hakama portion 401 provided with a threading hole 403, and the inner peripheral surface 405 of this ring-shaped
The needle bar 28 is fitted with the outer circumferential surface 287 of the needle bar 28 and held there. Usually, the needle bar 28 is fixed to the needle bar arm 90. Further, a needle bar thread hook 40 is attached to the needle bar 28. When sewing with a sewing machine, the other end 183 of the sewing machine needle 18 is inserted into the holding hole 28.
1 until it hits the back of 1, and then insert it between the tip of the hook on the sewing machine and the threading hole 403 of the sewing machine needle.
The direction of the sewing machine needle is determined by rotating it so that the angle is at a predetermined angle, and the sewing machine needle 18 is fixed to the needle bar 28 with a set bolt 288.

(Problem 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 problem) The needle clamping device of the sewing machine of the invention has a pointed end tapered at one end and having a threading hole, and a needle stopper on the other end that is congruent with the threading hole. a sewing machine needle having an engaging end portion having an angled engaging surface; and an engaging portion that abuts the engaging surface of the sewing machine needle and holds the engaging end portion of the sewing machine needle so as to be movable up and down. A needle shank adapter includes a lower end portion having a holding hole, an upper end portion having a small outer diameter neck portion, and a guide protrusion; It has a holding hole into which the upper end is inserted, an engagement pin that is biased towards the center from the side wall of the holding hole, and a guide groove that is formed in a wall that forms the holding hole and that guides the guide protrusion. It consists of a needle bar.

That is, the sewing machine needle stop device of the present invention is composed of a sewing machine needle, a needle shank adapter, and a needle bar.

In the needle stop device of this sewing machine, a guide protrusion is guided into the holding hole of the needle bar so that the direction of the threading hole can be determined in a specific direction while the sewing machine needle is held in the needle shank adapter. The upper end of the needle shank adapter is inserted while being guided by the groove, and the needle shank adapter is engaged with the needle bar by the neck portion and the engagement pin.

This sewing machine needle has a pointed end that is tapered at one end and has a threading hole, and an engaging end that has an engaging surface forming a constant angle with the threading hole at the other end.

The engaging end portion provided on the other end side of the sewing machine needle is a portion that engages with a needle shank adapter described later. This engaging end may have any shape as long as it is a recess formed on the outer peripheral surface of the sewing needle. As this engaging end, 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 peripheral surface, etc. can be used.

The needle shank adapter has an engaging part that engages with the engaging surface of the sewing machine needle, a lower end with a holding hole that holds the engaging end of the sewing machine needle so that it can move up and down, and a neck part with a small outer diameter. and an upper end portion having a guide protrusion.

If the lower end of this needle shank adapter can hold the sewing machine needle at its engaging end so that it can move up and down,
The shape of the holding hole, the shape of the engaging portion, etc. may be any shape. In order to hold the sewing machine needle in a vertically movable manner, for example, a tap is provided on the outer peripheral surface of the lower end facing the central axis of the holding hole, a screw is screwed into this tap, and the tip of the screw is engaged with the sewing machine needle. The mating surfaces may be brought into contact. The upper end is provided with a neck portion and a guide protrusion that have a smaller outer diameter than the lower end.

When the upper end of the neck portion is inserted into the holding hole of the needle bar, which will be described later, the neck portion is biased against the engagement pin of the needle bar.
This is provided to enhance the biasing effect so that the needle shank adapter does not fall out of the holding hole of the needle bar. Therefore, it is desirable that the neck portion has a waist-like constriction, but the size, degree, etc. of the constriction may be determined in consideration of the shape of the engagement pin. The shape of this engagement pin can be any shape.

The guide protrusion determines the direction when the needle is inserted so that the upper end (therefore, the needle shank adapter and the sewing machine needle held there) and the needle bar are always in the same direction. . This guide protrusion may be determined in accordance with the guide groove of the needle bar.

The needle bar is held by the needle bar arm of the sewing machine so as to be able to move up and down, and includes a holding hole into which the upper end of the needle shank adapter is inserted, an engaging pin that is biased toward the center from the side wall of the holding hole, and a holding hole. It has a guide groove that guides the guide protrusion.

The holding hole of the needle bar must be formed so that the upper end of the needle shank adapter is smooth and the relative positional relationship between them does not change each time the needle shank adapter is inserted. The shape of this holding hole does not necessarily have to be circular in cross section.

The engagement pin of the needle bar applies a biasing force to the neck portion at the upper end of the needle shank adapter inserted into the holding hole. This engagement pin is, for example,
It is preferable to use a plate spring, a coil spring, a permanent magnet, or the like to bias the holding hole toward the center. Further, in order to prevent the needle shank adapter from falling out of the holding hole, the engaging pin is composed of a plurality of first engaging pins, second engaging pins, etc. facing the center of the holding hole. is desirable.

The guide groove of the needle bar is provided so that when the needle shank adapter is inserted into the holding hole, the relative positional relationship between the needle bar and the needle shank adapter remains constant so that it does not change each time the needle shank adapter is inserted. It is something that
This guide groove may be formed to correspond to the guide protrusion. The shape of this guide groove is, for example, a V-groove,
T-grooves, square grooves, spiral grooves, etc. can be used.

Note that the needle bar arm can be used as it is in its conventional shape or with some modification.

(Function) The sewing machine needle stop device of the present invention is composed of a sewing machine needle, a needle shank adapter, and a needle bar.

Normally, the needle bar is held by a sewing machine needle bar arm fixed to the sewing machine body so as to be movable up and down.

Further, the engaging end portion of the sewing machine needle is inserted into the holding hole of the shank adapter, and a sewing machine needle set that is integrated with the respective engaging surfaces and engaging portions is already prepared. When sewing is to be performed, the guide protrusion of the sewing machine needle set is guided by the guide groove of the holding hole, and the upper end of the set is inserted and engaged with the neck portion and the engagement pin provided on the needle bar. Ru. At this time, the threading hole of the sewing machine needle, the engaging end portion, the engaging portion of the needle shank adapter, and the guide protrusion are formed in a predetermined positional relationship. Therefore, the threading hole is set at the optimum position with respect to the tip of the hook of the sewing machine body.

It is also possible to set or replace the sewing machine needle using a robotic device. this is,
This is because the fingers of the robot device can easily and reliably grip the needle shank adapter (sewing machine needle) on the outer peripheral surface of the needle shank adapter.

(Example) Hereinafter, the needle stopper device for a sewing machine according to the present invention will be described in detail based on a specific example.

In this embodiment, the overall view when the sewing machine needle is attached to the needle bar is shown in the perspective view in FIG. 1, and the state before the sewing machine needle is attached to the needle bar is shown in the vertical sectional view in FIG. The state in which the sewing machine needle is attached to the needle bar is shown in the vertical sectional view of FIG.

That is, the sewing machine needle stop device of the present invention includes a sewing machine needle 10, a needle bar 20, and a needle shank adapter 30.
and a needle bar thread hook 40.

The sewing machine needle 10 has a pointed end 101 which is tapered at one end and has a threading hole 103, and the other end 101.
Reference numeral 5 is a round bar-shaped conventional sewing machine needle which is additionally processed, and consists of an engaging end 109 on which an engaging surface 107 forming a 90 angle with the threading hole 103 is formed.

This engagement surface 107 is a crescent-shaped recessed portion near the other end side 105 toward the center.

The needle shank adapter 30 is formed by lathe processing, and has a lower end 310 and an upper end 33.
It is composed of 0.

The upper end portion 310 is composed of a cylindrical portion 311 and a fitting portion 321 that extends to the cylindrical portion 311 and has a tapered outer circumferential surface 323 whose outer diameter decreases upward. The cylindrical portion 311 has an engaging portion that comes into contact with the engaging surface 107 of the sewing machine needle 10, that is, a fixing screw 31.
3, and a holding hole 315 for holding the engagement end 109 of the sewing machine needle 10. Further, this cylindrical portion 311 is provided with a diagonal notch 325 for guiding the thread to the threading hole 103.

The upper end portion 330 is sandwiched between end portions 335 and 337 that have approximately the same shape as the minimum diameter portion of this tapered outer peripheral surface 323, and has a neck portion 331 smaller in diameter than these ends and a neck portion 331 that opens toward the center near this end portion 335. The guide pin 341 is inserted into a through hole 345 and is comprised of a guide protrusion, that is, a guide pin 341.

The needle bar 20 is formed from a round bar,
Holding part 21, holding hole 23, and two engaging pins 2
5, 27, a ring-shaped leaf spring 28 which is biased toward the center from the outside of the engagement pins 25, 27 and bends the strip into a substantially circular shape, and a guide groove 29. It is a shaft-like member.

The holding part 21 is normally fixed to a reciprocating sewing machine needle bar arm 90 of the sewing machine main body, and the internal flesh is removed from one end face to the central part in order to make the holding part 21 lighter.

The holding hole 23 consists of a tapered inner circumferential surface 231 into which the tapered outer circumferential surface 323 of the upper end of the needle shank adapter 30 is inserted, and a hollow hole 233 with a circular cross section formed in the deep part of this tapered inner circumferential surface 231. There is.

The engagement pins 25 and 27 are comprised of round shaft members that are inserted into pin holes 251 and 271 formed in the holding hole 23 so as to form an included angle of 120 degrees from the side wall toward the center.

A biasing member that biases these engagement pins 25 and 27 is constituted by a ring-shaped leaf spring 28. The state at this time is shown in the cross-sectional view of FIG. 3 viewed from the arrow direction A--A of FIG. 2.

The guide groove 29 is formed on the wall forming the holding hole 23.
It is a groove with a rectangular cross section that guides the guide pin 341 and has a depth larger than a width.

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

The relative positional relationship among the sewing machine needle 10, needle bar 20, needle shank adapter 30, and needle bar thread hook 40 is shown in the arrow view of FIG. .

The sewing machine needle stopper constructed in this manner is used in the following manner.

Normally, the needle bar 20 is fixed to a needle bar arm 90, and a needle bar thread hook 40 is attached to the needle bar 20. In addition, the needle shank adapter 30
It is also possible to use one in which the sewing machine needle 10 is inserted into the holding hole 315 of the needle shank adapter 30 and the sewing machine needle 10 is fixed to the needle shank adapter 30 by the crescent-shaped engagement surface 107 and the fixing screw 313.

When a sewing operation is to be performed, the needle shank adapter 30 holding the rear sewing machine needle 10 is guided in the guide groove 29 of the holding hole 23 of the needle bar 20 by its guide pin 341. At this time, the threading hole 103 and the tip of the hook are in a predetermined positional relationship. and,
When it is further inserted, it is engaged with the neck portion 331 and the engagement pins 25, 27 provided on the needle bar 10, and is fixed by the inward biasing force of the leaf spring 28.

At this time, the threading hole 10 of the sewing machine needle 10
3 and the engagement end 109 are formed in a predetermined positional relationship, so that the threading hole 103 is set at an optimal position with respect to the tip of the hook of the sewing machine main body. Also, when removing the needle shank adapter 30 holding the sewing machine needle 10 from the needle bar 20, the leaf spring 28
When unfolded, the engagement pins 25, 27 move outward, and the neck portion 331 and these engagement pins 25, 27 move outward.
The needle shank adapter 30 can be removed from the needle bar 20. The situation at this time is shown in FIG.

According to this embodiment, the needle stop device of the sewing machine includes the sewing machine needle 10, the needle bar 20, and the needle shank adapter 3.
0 and the needle bar thread hook 40, there is no need to determine the direction of the tip of the hook of the sewing machine body and the threading hole 103 of the sewing machine needle, unlike the conventional sewing machine body. Therefore, even those who are not skilled in setting sewing machine needles can
The sewing machine needle 10 can be easily set in a short time. That is, the productivity of sewing work is improved.

[Effects] According to the present invention, the needle clamping device of a sewing machine has a pointed end that is tapered at one end and has a threading hole, and the other end has an engaging surface that forms a certain angle with the threading hole. a sewing machine needle having an engaging end portion with an engaging surface; a lower end portion having an engaging portion that comes into contact with an engaging surface of the sewing machine needle and a holding hole that holds the engaging end portion of the sewing machine needle in a vertically movable manner; a needle shank adapter consisting of an upper end having a small diameter neck portion and a guide protrusion; a holding hole which is held movably up and down on a needle bar arm of a sewing machine and into which the upper end of the needle shank adapter is inserted;
The sewing machine needle is made up of an engaging pin that is biased toward the center from the side wall of the holding hole, and a needle bar that is formed in the wall that forms the holding hole and has a guide groove that guides the guide protrusion. While being held by the yank adapter, insert the upper end of the needle shank adapter into the holding hole of the needle bar while guiding the guide protrusion with the guide groove,
The needle shank adapter is configured to be engaged with the needle bar using the neck part and the engagement pin, so when using a sewing machine needle and needle shank adapter that are already integrated, it is possible to connect the needle shank adapter to the needle bar during sewing work. You can easily set the sewing machine needle just by inserting it.
At this time, the threading hole of the sewing machine needle is set at the optimum position with respect to the tip of the hook of the sewing machine body. Therefore, it is not necessary to align the tip of the hook of the sewing machine and the threading hole of the sewing machine needle after inserting the sewing machine needle into the needle bar, as in the conventional method, so it is not necessary for people who are not skilled in setting sewing machine needles. but,
Sewing machine needles can be easily set in a short time. That is, the productivity of sewing work is improved.

The sewing machine needle can then be replaced or replaced, for example, by a robotic device. This is because the fingers of the robot device can easily and reliably set the outer peripheral surface of the needle shank adapter on the holding sewing machine.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire needle clamping device for a sewing machine according to a specific embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the sewing machine needle stop device according to the same embodiment, showing the state before the sewing machine needle is attached to the needle bar, and FIG. arrow view A
- FIG. 3 is a cross-sectional view of the needle bar seen from A. Figure 4 shows
FIG. 3 is a longitudinal cross-sectional view showing a state in which the sewing machine needle in the same embodiment is attached to a needle bar. FIG. 5 is an explanatory diagram of the same embodiment when the engagement pin is removed when viewed from arrow A-A in FIG. 4. 6 is a view of the relative positional relationship of the sewing machine needle 10, needle bar 20, needle shank adapter 30, and needle bar thread hook 40 in FIG. 4 when viewed from the direction of arrow C (direction of the tip of the sewing machine needle) It is. FIG. 7 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... Tip, 103
... Threading hole, 107 ... Engagement surface, 109 ... Engagement end, 20 ... Needle bar, 21 ... Holding part, 23 ...
...Holding hole, 25...Engagement pin, 27...Engagement pin, 28...Plate spring (pin biasing member), 29...
Guide hole, 30...Needle shank adapter, 310
...lower end, 313...engaging portion, 315...holding hole, 330...upper end, 331...neck portion, 3
41... Guide protrusion, 40... Needle bar thread hook.

Claims (1)

[Claims for Utility Model Registration] (1) A pointed end tapered at one end and having a threading hole, and an engaging end portion having an engaging surface forming a certain angle with the threading hole at the other end. a lower end portion having an engaging portion that comes into contact with the engaging surface of the sewing machine needle and a holding hole for removably holding the engaging end portion of the sewing machine needle; a neck portion having a small outer diameter; A needle shank adapter consisting of an upper end having a guide protrusion, a holding hole which is held movably up and down on the needle bar arm of the sewing machine and into which the upper end of the needle shank adapter is inserted, and a side wall in the holding hole. The sewing machine needle is composed of an engaging pin that is biased toward the center, and a needle bar that is formed in a wall portion that forms the holding hole and has a guide groove that guides the guide protrusion, and the sewing machine needle is connected to the needle shank. While being held by the adapter, insert the upper end of the needle shank adapter into the holding hole of the needle bar while guiding the guide protrusion with the guide groove, and insert the upper end of the needle shank adapter into the holding hole of the needle bar, and the needle shank adapter A needle stop device for a sewing machine, characterized in that a needle shank adapter is engaged with the needle bar. (2) The needle shank adapter has a tapered outer circumferential surface whose outer diameter gradually increases from the neck portion toward the end on the holding hole entrance side. . (3) The sewing machine needle stop device according to claim (1) of the utility model registration, wherein the sewing machine needle and the needle shank adapter are integrally fixed. (4) The needle shank adapter consists of a constricted neck, a plurality of engagement pins that come into contact with the neck, and a ring-shaped leaf spring that biases the engagement pins toward the center and has a notch. A needle stopper device for a sewing machine according to claim (1) of the registered utility model.