JPH09192381A - Thread running device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To run a thread through a needle and hook a thread on a needle bar thread guide concurrently and thereby improve an ease of operation. SOLUTION: A specified thread running operation can be performed by arranging a thread M1, no the end side of this thread running device, which is hooked across thread hooking member 12, at the opposite side of a thread running hook 11b holding the needle of a stitching needle 6, by the transfer of the thread hooking member 12 to be interlocked with the rotation of a thread running shaft 7. At the same time, the thread guiding-in end part 5a of a needle bar thread guide 5 is arranged within the transfer track of a thread M2 of an upstream side oriented toward the thread running shaft 7 side by the thread hooking member 12, by transferring the thread M2. Thus, it is possible to hook the thread M2 on the needle bar thread guide 5 by allowing the thread M2 to find its way into the back side of its transfer direction in the thread guiding-in end part 5a by causing the thread M2 to ride over the thread guiding-in end part 5a.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a threading device for a sewing machine.

[0002]

2. Description of the Related Art Since it is difficult to pass a thread through a needle hole of a sewing machine needle, various proposals have been made for a device for automatically performing the threading operation. For example, Japanese Patent Laid-Open Nos. No. 128091, JP-A-3-133
The device described in Japanese Patent No. 485 is known. The basic configuration of the threading device of the sewing machine described in these publications is
While the operating rod is biased upward by a spring, the operating rod is lowered by the drive of the actuator, and the threading rod is lowered in conjunction with the lowering of the operating rod and then rotated, and the threading hook Thread into the needle hole of the sewing machine needle, hook the thread on the threading hook, and pull out the threading hook from the needle hole to pull out the thread hooked on the threading hook together. For example, it is automatically passed.

[0003]

Here, in operating the above threading device, for example, Japanese Patent Application Laid-Open No. 3-133 is used.
As described in Japanese Patent No. 485, first, before the operation, a thread from a thread supply source (thread winding) is manually threaded on a needle bar thread guide provided at a lower portion of a needle holder. However, such a manual thread hooking operation for the needle bar thread guide is troublesome and has to be carried out in a narrow area beside the needle, resulting in poor workability.

Incidentally, the same problem remains even if the threading operation is manually performed on the needle bar thread guide after the thread is passed through the needle hole by the threading device.

Therefore, an object of the present invention is to provide a threading device for a sewing machine, which is capable of threading and threading a needle bar thread guide.

[0006]

In order to achieve the above object, a threading device for a sewing machine according to the present invention is arranged parallel to a needle bar which is movably supported and has a lower end supporting a sewing machine needle. In addition, the threading shaft is rotatably and movably supported, and the sewing machine needle operates by interlocking with the rotation of the threading shaft provided at the threading shaft at a predetermined position in the axial direction. The threading hook that can enter / retract with respect to the needle hole and the operating rod that is engaged with the threading shaft and movably supported up and down, and lowers the operating rod. After lowering the threading shaft, it is further rotated to allow the threading hook to enter the needle hole, while the operating rod is raised to rotate the threading shaft in the opposite direction. The threading hook against the needle hole. The threading hook is moved back and forth with respect to the needle hole to catch the thread from the thread supply source arranged on the side opposite to the threading hook across the needle hole, thereby enabling threading. In the threading device of the sewing machine, the threading shaft moves in conjunction with the rotation of the threading shaft at a predetermined position in the axial direction, and the end side of the thread from the thread supply source is suspended and is suspended. A thread hooking member in which a thread upstream of the thread on the end side is directed to the threading shaft side is provided, and the threaded member is moved by the movement of the thread hooking member in conjunction with the rotation of the threading shaft. Side thread can be arranged on the side opposite to the threading hook sandwiching the needle hole, and within the range of the movement locus of the upstream thread oriented toward the threading shaft side, the needle bar thread guide It is characterized in that the yarn introduction end is arranged.

According to the threading device of the sewing machine having such a structure, the thread on the end portion hung on the threading member is moved by the movement of the threading member in conjunction with the rotation of the threading shaft. The threading hook is arranged on the side opposite to the threading hook sandwiching the needle hole to perform a predetermined threading operation, and the thread hooking member moves the thread on the upstream side directed toward the threading shaft side to move the thread. By arranging the thread introduction end of the needle bar thread guide in the range of the movement locus, the thread on the upstream side passes over the thread introduction end and enters the back side of the thread introduction end with respect to the moving direction of the thread. The needle bar thread guide is threaded.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a threading device of a sewing machine according to an embodiment of the present invention, and shows a state before threading and threading with respect to a needle bar thread guide. The threading device of this embodiment is applied to a sewing machine equipped with a needle rocking device.

In FIG. 1, reference numeral 1 indicates a needle bar rocking base supported by a machine frame of the sewing machine.
It is structured so as to swing in the left-right direction in the drawing in synchronization with the upper shaft about the fulcrum 1b. A needle bar 2 having a sewing needle 6 fixed at a lower end by a needle stopper 4 is supported on the needle bar swing base 1 so as to be vertically movable, and a threader arranged parallel to the needle bar 2. A shaft 7 is supported so as to be vertically movable and rotatable.

On the upper side of the threading shaft 7, there is inserted and fixed a pin 8 which penetrates in a direction orthogonal to the axial direction (vertical direction) and has both ends 8a and 8b protruding outward. ,
The thread hanging plate support 13 is rotatably supported in a state in which the vertical movement is restricted. This thread hanging plate support 13
A pin 13a (see FIG. 3) protruding outward is planted in this.

A substantially hollow cylindrical operating rod 10 is inserted into the threading shaft 7 so as to be vertically movable. This operating rod 10
Is urged upward by a spring 14 arranged between the machine frame and the machine frame, and its rotation is restricted by a rotation stopper (not shown). The operating rod 10
A spring 9 is provided between the upper end of the pin 8 and the pin 8 described above, and the urging force of the spring 9 causes the pin 8, that is, the threading shaft 7, to be urged downward in the drawing.

As shown in FIG. 3, cam grooves 10a and 10b are formed in the upper and lower portions of the outer peripheral surface of the operating rod 10 so as to extend vertically along the outer periphery in an arc shape. The upper cam groove 10a is an inclined groove that descends from the left side to the right side in FIG.
One end 8b of the pin 8 is loosely fitted in the pin 0a. The lower cam groove 10b is opposite to the cam groove 10a shown in FIG.
Is formed as an inclined groove that rises from the left side to the right side, and the pin 13a is loosely fitted and arranged in the cam groove 10b. While the threading shaft 7 is being urged downward by the spring 9, one end 8a of the pin 8 is located at the lower end of the cam groove 10a and presses the lower end of the cam groove 10a. It is arranged at the lower end of the cam groove 10b and presses the lower end.

A threading hook base 11 is fixed to the lower end of the threading shaft 7. In this threading hook base 11,
The threading hook base 11 together with the threading shaft 7 at a predetermined position described later.
Is a thread guide hook 11b that can enter the needle hole 6a of the sewing machine needle 6 when it is rotated clockwise in FIG. 4, and a hook guide that is arranged parallel to both sides of the thread guide hook 11b and that can guide the thread. 11a and 11c are fixed (see FIGS. 4 and 6).

The other end portion 8b of the pin 8 fixed to the threading shaft 7 is, when the threading shaft 7 is lowered,
The positioning plate 3 fixed to the needle bar 2 is abutted (the vertical position of each member at this time is referred to as a predetermined position). At this time, the threading hook 11b and the needle hole 6a are provided.
The positioning plate 3 is positioned in the up-down direction so that the heights of and are the same.

Further, a thread hook is provided on a side portion (a rear surface of the planting surface of the pin 13a) opposite to the thread thread hook 11b side with the thread thread shaft 7 of the thread hook plate support 13 interposed therebetween. A thread hanging plate 12 as a member is arranged. This thread hanging board 1
2 is a side plate 1 having a shape extending in the left-right direction in FIG.
A pin 12b which is equipped with 2g and is planted in the side plate 12g and whose tip is inserted into the thread hanging plate support base 13.
Is in a state of being rotatably supported by the thread hanging plate support 13 (see FIGS. 1 and 4).

A cam surface 12a is formed at the right end of the side plate 12g of the thread hooking plate 12 in FIG. 1 so as to come into contact with a surface 1a of the needle bar rocking base 1 facing the thread hooking plate 12. On the left side in FIG. 1 of the cam surface 12a of the side plate 12g, hook-shaped thread locking portions 12c and 12d capable of locking threads in order from right to left in FIG. 1 are in the opposite direction to the direction of the pin 12b. Are provided so as to face each other (from the paper surface in FIG. 1 toward this side). These thread locking portions 12c and 12d are provided on the axis of the needle bar 2 and the threading shaft 7.
Are arranged so as to be parallel to an imaginary line connecting with the axis center of.

As shown in FIG. 4, a lower plate 12j is fixed to the left end of the side plate 12g in FIG. 1 in a direction opposite to the direction in which the pin 12b is directed. An arc-shaped first arc plate 12i is fixed to the tip of the lower plate 12j, and a thread holding portion 12e capable of holding a thread is formed at the tip of the first arc plate 12i. There is. The thread holding portion 12e is located further on the front side in FIG. 1 than the thread locking portions 12c and 12d, and slightly below the thread locking portions 12c and 12d in FIG. A second arc-shaped plate 12h having an arc shape is fixed between the tip and the base of the lower plate 12j, and a thread holding portion capable of holding a thread is provided at the tip of the second arc-shaped plate 12h. 12f
Are formed. The thread holding portion 12f is located on the other side of the thread holding portion 12e from the paper surface in FIG. 1, is closer to the front side than the thread locking portions 12c and 12d in FIG. 1 and is closer to the thread locking portions 12c and 12d in FIG. It is located slightly above (see FIGS. 1 and 4).

A spring (not shown) is engaged with the thread hooking plate 12, and the thread hooking plate 12 is biased by the spring in the counterclockwise direction in FIG. 1 with the pin 12b as a fulcrum. It is in a state. However, the cam surface 12a of the thread hooking plate 12 faces the facing surface 1 of the needle bar rocking base 1.
Since it is in contact with a, the rotation of the thread hooking plate 12 is restricted.

Therefore, when the thread hooking plate 12 descends together with the threading shaft 7, the cam surface 12a is no longer brought into contact with the facing surface 1a, and the thread hooking plate 12 moves counterclockwise in FIG. 1 with the pin 12b as a fulcrum. As shown in FIG. 2, the rotation is stopped by a rotation stopper (not shown) so that the rotation is stopped in an upright state.

When the threading shaft 7 is further lowered and one protruding end 8a of the pin 8 hits the positioning plate 3 fixed to the needle bar 2, the thread holding portions 12e, 12e.
The yarn hooking plate support 13 is vertically positioned with respect to the threading shaft 7 so that the height f is the same as the height of the needle hole 6a.

When the thread hooking plate 12 is rotated counterclockwise in FIG. 4 together with the thread hooking plate support 13 at this position, that is, at a predetermined position, as shown in FIG. 7, the first circular arc plate 12i. The threading hook 11b and the hook guides 11a and 11c described above are located between the second circular arc plate 12h and the second circular arc plate 12h, and the thread holding portions 12e and 12f are located above the sewing machine needle 6 in FIG. Relationships are set.

At this time, the thread locking portion 12c is located above the thread introduction end 5a of the needle bar thread guide 5 and the thread locking portion 12d is located below the thread locking portion 12c. 12
In the range of the rotation locus of d on the side of the threading shaft 7 (correctly, the range L on the side of the threading shaft 7 of the rotation locus N of the thread M2 spanned between the thread locking portions 12c and 12d), The positional relationships are set so that the yarn introducing end 5a of the yarn guide 5 is located (see FIG. 9).

Next, the operation of the threading device thus constructed will be described. When threading is performed before the start of sewing after turning on the power of the sewing machine, first, when an operator turns on a threading switch (not shown), the upper shaft is driven so that the needle bar 2 is located at the uppermost position, and the needle bar 2 When is at the uppermost position, the drive of the upper shaft is stopped.

Next, the operator hangs the thread M from a thread supply source (not shown) in the order of the thread locking portions 12c and 12d and the thread gripping portions 12e and 12f, and the thread hung between them is generally tense. Set to do. Of course, the order of setting may be reversed. At this time, the thread hanging plate 1
As shown in FIG. 1, 2 is not upright, and the thread locking portions 12c and 12d and the thread gripping portions 12e and 12f have the needle bar 2,
Since it is separated from the needle bar rocking base 1, the work for setting the thread M is extremely easy to perform.

When the thread M is set in this manner, the operating rod 10 is lowered against the urging force of the spring 14 by, for example, projecting the cylinder head of an air cylinder as an actuator (not shown). Let The actuator is not limited to the air cylinder, and a known actuator disclosed in the prior art, such as a motor, may be appropriately used.

When the operating rod 10 is lowered in this manner, the threading shaft 7 is also lowered together with the operating rod 10, and the cam face 12a is not brought into contact with the facing surface 1a in association with the lowering. The thread hanging plate 12 is a pin 12b.
Counterclockwise in FIG. 1 (P in FIG. 1)
Direction), stand upright and then stop.

Then, when the operating rod 10 is further lowered, the other end 8b of the pin 8 abuts on the positioning plate 3 and the downward movement of the threading shaft 7 is stopped, as shown in FIG. At this time, the thread hanging plate 12 and the threading hook base 1
1 has the positional relationship shown in FIG. Here, for convenience of description, the thread that is on the end side of the thread M from the thread supply source and that is threaded between the thread gripping sections 12e and 12f is threaded between M1 and the thread gripping sections 12e and 12f. The thread locking portion 12 is directed toward the threading shaft 7 side by the thread locking portions 12c and 12d on the upstream side (thread supply source side) of the thread M1 being threaded.
The thread hung between 2c and 12d is designated as M2.

Next, when the operating rod 10 is further lowered, the spring 9 is compressed while only the operating rod 10 is lowered, as shown in FIG. At this time, since the operating rod 10 cannot rotate, one end 8a of the pin 8 of the threading shaft 7 moves in the cam groove 10a of the operating rod 10 which descends, and together with the threading shaft 7, the threading hook base. 11, the threading hook 11b, and the hook guides 11a and 11c rotate in the clockwise direction in FIG. 4 (direction of arrow Q in FIG. 3).
Further, at this time, the pin 13a of the thread hooking board support 13 moves in the cam groove 10b of the operating rod 10 which descends, and the thread hooking board 12 together with the thread hooking board support 13 and the threading hook stand 11 are separated from each other. It rotates in the opposite direction, that is, counterclockwise in FIG.

When the thread hooking plate 12 rotates in this way, the thread locking portions 12c and 12d draw a rotational locus that traverses the thread introducing end 5a of the needle bar thread guide 5 when viewed from above and below, As shown in FIG. 9, the thread M2 hung between the thread locking portions 12c and 12d moves along the distal end side portion of the needle bar thread guide 5, and then the thread of the needle bar thread guide 5 concerned. It passes over the introduction end 5a and enters the back side of the yarn introduction end 5a with respect to the moving direction of the yarn (see FIGS. 8 and 9). The thread after entering this back side is shown as M '.

Further, when the thread hooking plate 12 is rotated in this manner, the thread M1 hung between the thread gripping portions 12e and 12f abuts the sewing machine needle 6 and bends as shown in FIG. The tension of the thread M1 is further increased.

At this time, the threading hook 11b is in contact with the sewing machine needle 6 and is tensioned on the other side of the needle hole 6 (the left side in FIG. 6; the side opposite to the threading hook 11b sandwiching the needle hole 6). The yarn M1 is on the way to the yarn M1 (see FIG. 6), then enters the needle hole 6a, and the yarn M1 is captured at its tip (see FIG. 7). Here, as described above, the thread M1 is in contact with the sewing machine needle 6 and is bent, that is, the thread M1 is in a tensioned state on the side opposite to the threading hook 11b that reliably sandwiches the needle hole 6, The threading hook 11b is surely caught.

Then, the operating rod 10 is raised by the biasing force of the spring 9 by pulling in the cylinder head of the air cylinder as the actuator described above. Then, the thread hanging plate 12 rotates in the opposite direction to the above and returns to the position shown in FIG. At this time, the thread locking portion 12
The shapes of c and 12d are hook shapes in which the binding force to the thread M2 is lost when the thread locking portions 12c and 12d move in the opposite direction to the above, and the needle bar thread guide 5 is as described above. In addition, the yarn introduction end portion 5a intersects the rotation locus of the yarn M2.
Since the thread M2 that has entered the back side of the thread has a shape that cannot return, the thread M2 that has entered the back side of the thread introduction end 5a is left at that position, and the thread for the needle bar thread guide 5 Multiplication is achieved.

When the operating rod 10 is raised by the urging force of the spring 9 as described above, the threading hook 11b and the hook guides 11a and 11c rotate in the opposite direction to the position shown in FIG. Return. At this time, the threading hook 11
The thread M1 captured by b is the threading hook 1
It passes through the needle hole 6a together with 1b. Here, the binding force of the thread holding portions 12e and 12f to the thread M1 is weak against the force of the threading hook 11b to catch and retract the thread M1. Therefore, the thread M1 is detached from the thread holding portions 12e and 12f. While being caught by the threading hook 11b, the threading hook 11b is pulled to the opposite side of the needle hole 6a to achieve threading.

Then, when the operating rod 10 is further raised by the urging force of the spring 14, the threading shaft 7 rises together with the operating rod 10 and returns to the initial position shown in FIG.

As described above, in this embodiment, by the rotation of the thread hooking plate 12 which is interlocked with the rotation of the threading shaft 7,
The thread M1 on the end side hung over the thread hooking plate 12 can be arranged on the opposite side of the threading hook 11b sandwiching the needle hole 6a of the sewing machine needle 6 to perform a predetermined threading operation, and at the same time, the thread hooking plate. 1
The upstream thread M2 directed to the threading shaft 7 side by 2
To the range L of the rotation locus N on the threading shaft 7 side,
By arranging the yarn introducing end 5a of the needle bar yarn guide 5, the upstream yarn M2 is made to ride over the yarn introducing end 5a and enters the yarn introducing end 5a on the back side with respect to the moving direction of the yarn. Since the needle bar thread guide 5 is threaded on the needle bar thread guide 5, threading and thread hooking on the needle bar thread guide can be performed at the same time. Therefore, when the threading device is applied to an embroidery sewing machine that frequently changes threads, it is particularly effective.

In addition, the present embodiment has the following effects. That is, when the operator sets the thread M on the thread locking portions 12c and 12d of the thread hooking plate 12 and the thread grips 12e and 12f, the thread locking portions 12c and 12d,
Since the thread gripping portions 12e and 12f are configured to be separated from the needle bar 2 and the needle bar rocking base 1, the needle bar 2 and the needle bar rocking base 1 interfere with each other when the thread M is set. Therefore, the thread M can be easily set.

Further, since the thread M1 comes into contact with the sewing machine needle 6 and bends so that the thread M1 is firmly tensioned on the side opposite to the threading hook 11b which sandwiches the needle hole 6, the thread M1 is reliably threaded. The threading hook 11b catches the thread so that the threading can be reliably performed. Incidentally, if the thread M1 is slack on the side opposite to the threading hook 11b that sandwiches the needle hole 6, the threading hook 11b will not be properly caught.

Further, the thread hooking plate 12 rotates about the threading shaft 7 by the pin 13a, the cam groove 10b, etc.,
By this rotation, the thread M1 is arranged to be stretched on the side opposite to the threading hook 11b sandwiching the needle hole 6,
For example, as compared with a threading device such as that disclosed in Japanese Patent Laid-Open No. 3-133485, which uses a complicated link mechanism to stretch the thread M on the side opposite to the threading hook 11b sandwiching the needle hole 6, Can be simplified.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, in the above embodiment, for example, by rotating the threading hook 11b, the threading hook 11b can be moved in and out of the needle hole 6a, and the thread hooking plate 12 is rotated. The thread M on the end side that is wound around the thread hanging plate 12
1 is arranged on the opposite side of the threading hook 11b sandwiching the needle hole 6a, and the needle bar is in the range L on the threading shaft 7 side of the rotation locus N of the upstream thread M2 which is directed to the threading shaft 7 side. Although the yarn introducing end 5a of the yarn guide 5 is positioned, the rotating operation may be replaced with another moving operation.

Further, in the above embodiment, the thread locking portion is provided at two locations, but it is also possible to provide only one of them, that is, the upstream thread M2 is directed toward the threading shaft 7 side. At the same time, the needle bar thread guide 5 is placed in the range on the threading shaft 7 side of the movement locus of the upstream thread M2 directed to the threading shaft 7 side.
It suffices that the yarn introduction end portion 5a of the above is located.

Further, in the above-mentioned embodiment, the actuating rod is lowered by the actuator.
Of course, it is also possible to manually lower the operating rod.

Furthermore, in the above-described embodiment, an example in which the threading device is applied to a sewing machine having a needle rocking device is described, but to a sewing machine having no needle rocking device. It goes without saying that the same can be applied to.

[0043]

As described above, according to the threading device of the sewing machine of the present invention, the end portion side which is hung on the threading member is moved by the movement of the threading member which is interlocked with the rotation of the threading shaft. This thread can be placed on the side opposite to the threading hook that sandwiches the needle hole of the sewing machine needle to perform a predetermined threading operation, and the thread on the upstream side that is directed to the threading shaft side By moving and arranging the thread introduction end of the needle bar thread guide within the range of the movement locus, the thread on the upstream side gets over the thread introduction end and the movement of the thread at the thread introduction end Since the needle bar thread guide is threaded on the back side with respect to the direction, threading and needle bar thread guide thread hooking can be performed at the same time, further improving operability. Become.

[Brief description of the drawings]

FIG. 1 is a front view showing a threading device for a sewing machine according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which an operating rod of the threading device shown in FIG. 1 is lowered to a predetermined position.

FIG. 3 is a side view corresponding to the arrow AA in FIG.

FIG. 4 is a plan view corresponding to the arrow B direction in FIG.

5 is a front view showing a state where the operating rod of the threading device shown in FIG. 2 is further lowered.

FIG. 6 is a side view corresponding to the arrow CC in FIG.

FIG. 7 is a plan view corresponding to the direction of arrow D in FIG. 5 when the operating rod of the threading device shown in FIG. 5 is maximally lowered.

8 is a plan view corresponding to the arrow E in FIG. 5 when the operating rod of the threading device shown in FIG. 5 is maximally lowered.

FIG. 9 is a schematic plan explanatory view showing a threading operation of the threading device.

[Explanation of symbols]

 2 Needle bar 5 Needle bar thread guide 5a Thread introduction end of needle bar thread guide 6 Sewing machine needle 6a Needle hole 7 Threading shaft 10 Actuating rod 11b Threading hook 12 Threading member L Threading path of upstream thread Axial range M Thread M1 Thread end side M2 Upstream thread N Upstream thread movement locus

Claims (1)

[Claims] 1. A threading shaft, which is movably supported and arranged parallel to a needle bar having a lower end supporting a sewing machine needle, and is rotatably and movably supported, and the threading shaft. And a threading hook that can be moved in and out of the needle hole of the sewing machine needle by operating in conjunction with rotation of the threading shaft at a predetermined position in the axial direction, and engaged with the threading shaft. And the operating rod supported so as to be movable up and down, and the operating rod is lowered to lower the threading shaft, and then further rotated to move the threading hook with respect to the needle hole. On the other hand, the threading shaft is rotated in the opposite direction by raising the actuating rod while retracting the threading hook, and the threading hook is retracted with respect to the needle hole. The needle hole is A threading device of a sewing machine capable of threading by catching a thread from a thread supply source disposed on the side opposite to the threading hook, and rotating the threading shaft at a predetermined position in the axial direction. The yarn is moved in conjunction with the yarn, and the end side of the yarn from the yarn supply source is laid over, and the yarn upstream of the thread on the hung end side is oriented toward the threading shaft side. A hooking member is provided, and movement of the thread hooking member linked to the rotation of the threading shaft causes
A range of the locus of movement of the upstream thread directed toward the threading shaft side, while allowing the thread on the suspended end side to be arranged on the side opposite to the threading hook sandwiching the needle hole. A threading device for a sewing machine, in which a thread introduction end of a needle bar thread guide is arranged.