JPH0131170Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a needle clamp device for a sewing machine that sews 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. .
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;
It intersects with this holding hole 281 from the normal direction and consists of a tap hole 283 with a female thread and a set bolt 288 with a concave tip that is screwed into the hole, and is configured to be held by the sewing machine needle bar arm 90 in a vertically movable manner. ing. The needle bar thread hook 40 is ring-shaped with a skirt portion 401 provided with a threading hole 403, and is held by fitting the outer circumferential surface 287 of the needle bar with the ring-shaped inner circumferential surface 405. .

Usually, a needle bar thread hook 40 is already attached to this needle bar 28. Other end 18 of sewing machine needle 18
3 until it hits the back of the holding hole 281, and then rotate the sewing machine needle to determine the direction so that the tip of the hook on the sewing machine body and the threading hole 181 of the sewing machine needle are at a predetermined angle. Set bolt 28
It is fixed at 8.

(Problem to be solved by the invention) By the way, the direction of the threading hole 181 is determined as follows.
Since the sewing machine needle 18 needs to be highly accurate and the other end 183 of the sewing machine needle 18 has a round bar shape, the sewing machine needle 18
A considerable amount of skill is required to accurately set the needle bar 28 on the needle bar 28. When fixing the sewing machine needle 18 with the set bolt 288, this orientation may change slightly. In other words, sewing machine needle 18
Since it is difficult to set the sewing machine, the efficiency of sewing work may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine needle clamping device that allows even beginners to easily set sewing machine needles in a short time.

[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 consisting of a lower end portion having a holding hole and an upper end portion having a groove-shaped notch extending in a direction perpendicular to the axial direction on the other end side of the lower end portion in the form of a groove, and a sewing machine needle. The needle shank adapter is held by a rod arm so as to be movable up and down, and has a holding hole into which the upper end of the needle shank adapter is inserted, and is rotatably held by the side wall of the holding hole and extends from the normal direction of the holding hole toward the center. an engaging pin whose outer circumferential surface is biased; and a pin member that slides vertically on a wall forming the retaining hole and biases the engaging pin toward the center of the retaining hole at a downward sliding end. and a needle bar with a needle shank adapter, and when the sewing machine needle is held in the needle shank adapter, the groove-like notch is aligned with the holding hole of the needle bar and the needle is inserted into the needle bar. The needle shank adapter is characterized in that the upper end of the shank adapter is inserted and the needle shank adapter is engaged with the needle bar by the groove-like notch and the engagement pin.

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. The feature of the needle stop device of this sewing machine is that when the sewing machine needle is held in the needle shank adapter, the groove-shaped notch is aligned with the holding hole of the needle bar approximately on the engagement pin side. By inserting the upper end of the yank adapter, the needle shank adapter can be engaged with the needle bar using the groove-like notch and the engagement pin so that the tip surface and the threading hole are in a predetermined positional relationship. In other words, the sewing machine needle can be easily fixed to the needle bar via the needle shank adapter.

Further, 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 and an engaging portion, which will be 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 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 comes into contact with the engaging surface of the sewing machine needle, a lower end part that has a holding hole that holds the engaging end part of the sewing machine needle so that it can move up and down, and the other end of the lower end part. The upper end portion has a groove-like cutout portion whose outer circumferential surface extending in a direction perpendicular to the axial direction is cut away. This groove-like notch can be similar to the recess provided in the sewing machine needle described above. By providing this needle shank adapter, the sewing machine needle can be easily and quickly set on the needle bar. Note that the holding hole that holds the sewing machine needle so as to be able to move up and down needs to have a screw hole or a through hole that penetrates from the side wall to the holding hole in order to securely hold the sewing machine needle. For example, in the case of a screw hole, a bolt is inserted, and in the case of a through hole, a fixing pin is inserted. Further, the upper end portion is a portion where the needle shank adapter itself is securely held on the needle bar by the outer circumferential surface and the groove-like cutout portion. This groove-like notch uniquely determines positioning in both the rotational direction and the vertical direction. Further, it is preferable that the needle shank adapter has a stopper portion that determines the insertion stop position when the needle shank adapter is inserted into the needle bar.

The needle bar has a holding hole, an engagement pin, and a pin biasing member. This needle bar engagement pin uses a part of its outer circumferential surface to connect the needle shank adapter in the vertical direction.
Each position in the rotational direction is determined in one specific direction. Furthermore, this engagement pin moves in the normal direction of this holding hole in order to hold the needle shank adapter from the needle bar in a vertically movable manner. This movement is urged by a pin urging member that slides vertically on the wall forming the holding hole. It is preferable that the pin biasing member is ring-shaped and has a tapered surface that comes into contact with the pin, and also holds the needle bar threading hole. Furthermore, it is also possible to use an integrated sewing machine needle and needle shank adapter. For example, any shape can be used, such as a round cross section, an angular cross section, a wedge shape, etc., but its dimensions must correspond to the groove-like cutout of the needle shank adapter.
Further, as the pin biasing member, for example, a ring-shaped slide ring, a so-called snap-lock type used for box doors, a magnet, etc. can be used.
A leaf spring, coil spring, or the like may be provided to bias this pin biasing member.

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

Therefore, during 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 groove-shaped notch provided at the other end to insert the sewing machine needle into the needle. Fix it to the rod. (Alternatively, you may use one in which the needle bar and sewing machine needle are integrated.) At this time, since the threading hole in the sewing machine needle and the groove-like notch are formed in a predetermined positional relationship, the threading hole is set at the optimum position relative to the tip of the hook on the sewing machine. Then, the engagement pin urges the outer circumferential surface of the sewing machine needle from the normal direction of the holding hole toward the center, thereby positioning and fixing the needle.

(Example) Hereinafter, the needle stopper device for a sewing machine according to the present invention will be described based on a specific example. The state in which the sewing machine needle and needle shank adapter of this embodiment are integrated is shown in the vertical cross section of FIG. 1 before being attached to the needle bar, and the state in which they are attached to the needle bar is shown in FIG. Shown in longitudinal section.

That is, the needle stop device of this sewing machine is
, a needle bar 20, a needle shank adapter 30,
It is composed of a needle bar thread hook 40.

The sewing machine needle 10 has a threading hole 103 formed in a pointed end 101, and an engaging surface or notch that engages with an engaging part of the needle shank adapter 30, that is, a set bolt 339 at a portion near the opposite side of the pointed end 101. It has a joining part 109. This notch engaging portion 109
is formed by additional processing in the conventional manufacturing process of sewing machine needles, and the flesh that remains after being scraped off has a half-moon shape.

The needle bar 20 is formed from a round bar,
It has a holding hole 22 into which the upper end of the needle shank adapter 30 is inserted, and a pin sliding hole 27 that has approximately the same diameter as this holding hole 22 and is perpendicular thereto.
The needle bar base 21, which has a deep hole 29 formed on the side opposite to the needle bar base 21, comes into contact with both ends of the pin sliding hole 27,
The engagement pin 23 is held so that it does not fall into the holding hole 22, and the engagement pin 23 is shaped like a thick ring and has a tapered inner surface where one end surface is thin and the thickness becomes thicker toward the other surface. needle bar base 21
A sliding ring 25 that slides on the outer peripheral surface of the needle bar base 2
Ring stopper 26 fixed on the outer peripheral surface of 1
and a cylindrical coil spring 28 which has one end surface in contact with the ring stopper 26 and the other end surface in contact with the end surface of the sliding ring 25 to urge the sliding ring 26 downward.

The needle shank adapter 30 has a crescent-shaped recess 319 and an upper end 31 with a small diameter and protruding upward.
and a thick ring-shaped lower end 33 located below the upper end 31. An engaging portion, that is, a set bolt 339 that is threadedly engaged with the screw 311 is provided from the outer circumferential surface of the lower end portion 33 to the central holding hole 301.

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

The relative positional relationship of the sewing machine needle 10, needle bar 20, needle shank adapter 30, and needle bar thread hook 40 is shown in the cross-sectional view of FIG. Fig. 4 shows how it looks from the point (direction of the tip of the sewing machine needle).

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

During sewing work, the needle bar 20 is normally fixed to the needle bar arm 90, and the needle bar thread hook 40 is attached to the needle bar 20.
is installed. Holding hole 2 of this needle bar 20
2 through the upper end 31 of the needle shank adapter. At this time, since the sliding ring 25 urges the engagement pin 23 to engage the crescent-shaped recess 319 provided in the upper end 31, the upper end 31
Fixed to 0. Since the threading hole 103, the notch engaging portion 109, the set bolt 339, and the crescent-shaped recess 319 in the sewing machine needle 10 are formed in a predetermined positional relationship, the threading hole 103 is located at the tip of the hook of the sewing machine body. It will be set at the optimal position for.

Also, when removing the sewing machine needle 10 from the needle bar 20,
When the sliding ring 25 is pushed upward, the engagement pin 23
The urging force applied to the sewing machine needle 10 is weakened, and the sewing machine needle 10 can be easily removed.

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 threading hole 103 and inserting the thread into the holding hole 231 in consideration of the orientation of the hook of the sewing machine body with respect to the tip surface, as in the conventional case. 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.

[Effects of the invention] According to the invention, the needle clamping device of a sewing machine has a point tapered at one end and having a threading hole, and an engaging surface forming a certain angle with the threading hole at the other end. a sewing machine needle having an engaging end portion; a lower end portion having a holding hole for vertically movably holding the engaging end portion of the sewing machine needle and having an engaging portion that comes into contact with the engaging surface of the sewing machine needle; A needle shank adapter consisting of an upper end portion having a groove-like notch in which the outer peripheral surface extending in a direction perpendicular to the axial direction has been cut away on the other end side of the lower end portion, and a needle shank adapter that is held movably up and down in the needle bar arm of the sewing machine. and a holding hole into which the upper end of the needle shank adapter is inserted, and an engagement in which the needle shank adapter is rotatably held by a side wall of the holding hole, and the outer circumferential surface is biased from the normal direction of the holding hole toward the center. The needle bar includes a pin, and a pin member that slides vertically on a wall portion forming the holding hole and urges the engagement pin toward the center of the holding hole at the downward sliding end, With the sewing machine needle held in the needle shank adapter, insert the upper end of the needle shank adapter into the holding hole of the needle bar with the grooved notch approximately aligned with the engagement pin side. Since the needle shank adapter is engaged with the needle bar by the groove-shaped notch and the engagement pin, the needle bar is fixed to the sewing machine needle bar arm of the sewing machine body during sewing work. . Thereafter, a combination of a sewing machine needle and a needle shank adapter is inserted into the holding hole of the needle bar. Then, the sewing machine needle is fixed to the needle bar by engaging the engagement pin with the crescent-shaped recess. At this time, the threading hole in the sewing machine needle and the notch engaging portion,
Since the crescent-shaped recesses are formed in a predetermined positional relationship, the threading hole is set at an optimal position with respect to the tip of the hook of the sewing machine body.

In other words, there is no need to consider the direction of 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 case. Therefore, even a person who is not skilled in setting sewing machine needles can easily set the sewing machine needle in a short time. That is, the productivity of sewing work is improved.

Then, the sewing machine needle can be set or replaced by, for example, a robot device. This means that when a ring-shaped needle shank adapter is set on a sewing machine needle, the fingers of the robot device can easily and securely grip the sewing machine needle that is integrated with the needle shank adapter on the outer circumferential surface of the needle shank adapter. It is from.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the sewing machine needle of the needle stopper device for a sewing machine according to a specific embodiment of the present invention before it is attached to the needle bar, and FIG. FIG. 3 is a longitudinal cross-sectional view showing a state in which a sewing machine needle is attached to a needle bar. Figure 3 shows arrow A-A in Figure 2.
FIG. 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. . FIG. 5 is a longitudinal cross-sectional view of a holding hole needle clamping device used to explain a conventional sewing machine needle clamping device. 10...Sewing machine needle, 103...Threading hole, 10
9... Notch-like engagement portion, 20... Needle bar, 22... Holding hole, 22... Engaging pin, 25... Sliding ring (member that biases the engagement pin), 30... Needle shank Adapter, 301... Holding hole, 319... Crescent-shaped recess, 339... Set bolt (engaging portion).

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 detachably holding the engaging end portion of the sewing machine needle; and the other end side of the lower end portion. a needle shank adapter comprising an upper end portion having a groove-like notch with an outer peripheral surface cut away extending in a direction perpendicular to the axial direction; The holding hole is formed by a holding hole into which the upper end portion is inserted, and an engaging pin that is rotatably held by a side wall of the holding hole and whose outer peripheral surface is biased from the normal direction of the holding hole toward the center. a needle bar that slides in the vertical direction and has a pin member that biases the engagement pin toward the center of the holding hole at the downward sliding end, the sewing machine needle While held by the yank adapter, insert the upper end of the needle shank adapter into the holding hole of the needle bar with the grooved notch approximately aligned with the engagement pin side, and insert the upper end of the needle shank adapter into the holding hole of the needle bar, A sewing machine needle stop device characterized in that the needle shank adapter is engaged with the needle bar by the engagement pin and the engagement pin. (2) The sewing machine needle stop device according to claim 1, wherein the pin biasing member is ring-shaped and has a tapered surface that contacts the pin and holds the needle bar threading hole. (3) The needle stop device for a sewing machine according to claim (1), wherein the sewing machine needle and the needle shank adapter are integrated. (4) The needle shank adapter for a sewing machine according to claim 1, wherein the needle shank adapter has a stopper portion that determines the insertion stop position when the needle shank adapter is inserted into the needle bar. .