JPH09192382A - Thread running device of sewing machine with needle fluctuating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid an increase in the manufacturing cost and the intensification of a noise without changing a driving source for a needle fluctuating device by reducing the number of parts to cut the cost to the minimum, allowable extent and smoothing the ascending action of an operating rod to make the sewing operation more reliable. SOLUTION: A stitching operation is performed by enabling a shaft 7 and an operating rod 10 to be fluctuated together with a needle bar 2 and fluctuating the needle bar 2 within a specified fluctuating range during a stitching operation to perform the stitching process without allowing a mechanism 10c for transmitting a power on the operating rod side to interfere with a mechanism 16 for transmitting a power on the driving source side. In a addition, both mechanisms 16, 10c are connected to each other by fluctuating the needle bar 2 to a specified fluctuating position outside the fluctuating range, and thereby the powder of the driving source 15 is transmitted to the operating rod 10 through the mechanism 16, 10c when the thread is run through a needle hole. Thus, the thread running operation is achieved by loweringand raising the operating rod 10. This operating design makes it possible to provide the mechanism 10c for transmitting a power on the operating rod side, on the operating rod 10. Further, the operating design makes it possible to raise the operating rod 10 using the stronger power of the drive source 15 than an energizing force, and besides, makes it possible to avoid the mounting of the drive source 15 on a needle rod support frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threading device applied to a sewing machine having a needle rocking device.

[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. In these publications, there is no specific description in which the threading device is applied to a sewing machine having a needle rocking device. However, for example, the threading device disclosed in JP-A-3-128091 is used as a needle. It can be considered to be applied to a sewing machine equipped with a rocking device.

FIG. 11 shows a simplified outline of the threading device disclosed in Japanese Patent Laid-Open No. 3-128091. In this threading device, by moving an actuator 100 as a drive source, a moving table 1 is provided via a pinion 101 and a rack 102 as a power transmission mechanism.
04 is lowered, and the projection 104a of the moving table 104 is brought into contact with the operating rod 105 to lower it.
The threading shaft 106 is lowered and then rotated, the threading hook 107 is inserted into the needle hole of the sewing machine needle, and the thread is hooked on the threading hook 107. Then, the actuator 100 is different from the above. The movable table 104 is raised by driving in the opposite direction,
The threading shaft 106 is rotated in the opposite direction to the above by pulling up the threading hook 107 to pull out the threading hook 107 from the needle hole, pull out the thread hooked on the threading hook 107 together, and then move the moving table 104 further. The operating rod 105 is raised to its original position, and the projection 104a of the movable table 104 is separated from the operating rod 105, whereby the operating rod 105 is raised to the original position according to the urging force of the spring 103. That is, the threading operation can be automatically performed.

In the proposed device, the threading shaft 106 is supported so as to be rotatable and vertically slidable with respect to a needle bar supporting frame which supports the needle bar slidably in the vertical direction. Therefore, if the needle bar support frame is swung by the needle swinging device of a known sewing machine, the threading shaft 10
6, the threading hook 107 and the operating rod 105 also swing together with the needle bar.

Here, the movable table 104 is provided with an operating rod 105.
The moving table 104 and the operating rod 10 are separately provided with respect to
Since the movable table 104 and the guide rod 108 for supporting the movable table 104 are spaced apart from each other at a position where they do not interfere with the swinging operating rod 105, when the threading (operating rod) is performed. Needless to say, the above-described threading operation can be achieved when the swing of 105 or the like is stopped), and the sewing can be performed without interfering the operating rod 105 with the moving base 104 and the guide rod 108 at the time of sewing. . That is, the threading device described in Japanese Patent Application Laid-Open No. 3-128091 can be applied to a sewing machine having a needle rocking device.

[0006]

However, in the above device, the swing side (thread threading shaft 106, thread threading hook 107, operating rod 105) and the fixed side (actuator 10).
0, the pinion 101, the rack 102, the movable base 104, and the guide rod 108) are required to be separated from each other. For example, the configuration in which the rack 102 is directly fixed to the operating rod 105 cannot be adopted. However, there is a problem in that the number of components is increased, and the like.

Further, since the operating rod 105 after the threading is pulled up not by the power of the actuator 100 but by the urging force of the spring 103 (which is considerably weaker than the mechanical force), the operating rod 105 and the thread are pulled up. If the through shaft 106 is not finished with a fairly high precision and fitted, the above-mentioned pulling-up operation will not be performed well, and the above-mentioned pulling-up operation will not be performed well even if some dust is attached to the sliding portion. .

Therefore, in order to prevent these problems from occurring,
A configuration in which the actuator 100 is mounted on the needle bar support frame and the rack 102 is directly fixed to the operating rod 105 is also conceivable, but the weight of the swinging portion becomes heavy, and the needle swinging motor of the needle swinging device needs to be upsized. Therefore, this method cannot be adopted because it causes problems such as high product cost and high noise.

Therefore, according to the present invention, the number of components of the threading device is reduced and the cost is reduced, and the operating rod is satisfactorily lifted to improve the reliability, and the needle swinging device is driven. An object of the present invention is to provide a threading device for a sewing machine, which is provided with a needle rocking device in which the source is left as it is and the increase in cost and noise is avoided.

[0010]

In order to achieve the above object, a threading device for a sewing machine equipped with a needle rocking device of the present invention is different from a sewing machine equipped with a needle rocking device for rocking a needle bar. A threading device attached to the needle bar, which is movably supported in the vertical direction and arranged parallel to the needle bar supporting a sewing machine needle at its lower end, and rotatably and movably supported in the vertical direction. A shaft, and a threading hook that is provided on the threading shaft and is capable of entering and retracting with respect to the needle hole of the sewing machine needle by operating in conjunction with the rotation of the threading shaft at a predetermined position in the axial direction. An operating rod which is engaged with the threading shaft and is supported so as to be movable up and down; and by lowering the operating rod, the threading shaft is lowered, and then further rotated, the threading hook. While pushing the needle into the needle hole, The threading shaft is rotated in the direction opposite to the above to retract the threading hook with respect to the needle hole, and the needle threading hook moves forward and backward with respect to the needle hole to move the needle. In a threading device of a sewing machine capable of threading by catching a thread from a thread supply source arranged on the side opposite to the threading hook sandwiching the hole, a drive source for raising and lowering the operating rod. And a power transmission mechanism on the drive source side that transmits the power of this drive source,
A power transmission mechanism on the operating rod side provided on the operating rod for transmitting power from the power transmission mechanism on the drive source side, and the threading shaft, the threading hook and the operating rod together with the needle bar. Both of the power transmission mechanisms are made swingable and, when the needle bar is located at a threading execution position, which is a swing position outside the sewing swing range of the needle bar by the needle rocker, Is characterized by.

According to the threading device of the sewing machine having the needle rocking device of the present invention thus constructed, the threading shaft, the threading hook and the operating rod can be rocked together with the needle bar, and at the time of sewing. The needle bar is swung within a predetermined swing range, and the power transmission mechanism on the operating rod side provided on the operating rod is sewn without interfering with the power transmission mechanism on the drive source side. When the needle bar is swung to a threading execution position that is a swing position outside the predetermined swing range, and the needle bar is located at this threading execution position, the power transmission mechanism on the drive source side and the power on the operating rod side The transmission mechanism is connected, and the power of the drive source is transmitted to the operating rod via both power transmission mechanisms, and the operating rod is lowered and raised to perform threading. As described above, since the operating rod is provided with the power transmission mechanism on the operating rod side, parts such as the moving table and the guide rod which form the threading device described in the prior art are not necessary, and the threading device after threading is not required. Since the operating rod is pulled up by the power of the drive source that is stronger than the urging force, the operating rod can be lifted well, and since the drive source is not mounted on the needle bar support frame, the needle swings. There is no need to upsize the drive source of the device.

[0012]

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 on a machine frame of the sewing machine, and a sewing machine needle 6 is fixed to a lower end of the needle bar rocking base 1 by a needle stopper 4. The needle bar 2 is supported so as to be vertically movable, and a threading shaft 7 arranged parallel to the needle bar 2 is supported so as to be vertically movable and rotatable. A needle bar rocking rod 17 is also pivotally attached to the needle bar rocking base 1.
Is configured to reciprocate in the left-right direction in the drawing by a known needle swinging motor (not shown) that is driven in synchronization with the vertical movement of the needle bar 2. Therefore, the needle bar rocking base 1 rocks in the left-right direction in the drawing around the fulcrum 1b in synchronization with the vertical movement of the needle bar 2, and the sewing needle 6 combines the vertical movement and the rocking movement. It has an elliptical motion.

On the upper side of the threading shaft 7, there is inserted and fixed a pin 8 which penetrates in a direction perpendicular 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 vertically movably inserted into the threading shaft 7. 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.

As shown in FIGS. 1 and 3, a rack 10c as a power transmission mechanism on the side of the operating rod is fixed to the back surface of the operating rod 10 in FIG. 1 so as to extend in the vertical direction. ing.

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.

The side of the thread hanging plate supporting base 13 opposite to the side of the thread passing hook 11b sandwiching the thread passing shaft 7 (the back side of the planting surface of the pin 13a) is hooked with the thread. 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 about 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 of the projecting ends 8a of the pins 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. 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 positioned above the thread introduction end 5a of the needle bar thread guide 5 and the thread locking portion 12d is positioned 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).

By the way, the needle bar 2 swings by the needle swing motor as described above, but at the time of sewing, as shown in FIG. 10, a predetermined range X (range between the left base line and the right base line) is set. During the threading, the threading execution position (a position further left in the drawing than the left baseline in the present embodiment) Y, which is a rocking position outside the predetermined range X, is rocked and then stopped. There is.

Then, when the needle bar 2 is stopped at the threading execution position Y, a pinion 16 as a power transmission mechanism on the drive source side is engaged with the rack 10c. The pinion 16 is fixed to its output shaft 15a of, for example, a motor (hereinafter referred to as a threading motor) 15 as a drive source fixed to the machine frame.

Next, the operation of the threading device thus constructed will be described. When performing threading after the power of the sewing machine is turned on and before the start of sewing, the operator first inserts the thread M from the thread supply source (not shown) into the thread locking portions 12c, 1c.
2d, the yarn gripping portions 12e, 12f are laid in this order, and the yarn laid between them is set so as to be substantially tense.
Of course, the order of setting may be reversed. At this time, as shown in FIG. 1, the thread hooking plate 12 is not upright, and the thread locking portions 12c and 12d and the thread gripping portions 12e and 12 are not erected.
Since f is separated from the needle bar 2 and the needle bar swing base 1,
The work of setting the thread M is made extremely easy.

Then, when the 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 swing motor is driven. By driving the needle swinging motor, the needle bar 2, the threading shaft 7, and the operating rod 10 are swung from the position shown in FIG. 1 about the fulcrum 1b, and when the needle bar 2 is swung to the threading execution position Y. The drive of the needle swing motor is stopped. At this time, the above-mentioned pinion 16 and the rack 10c are in a meshed state.

When the needle swinging motor stops, the threading motor 15 is driven to rotate the output shaft 15a in the clockwise direction in FIG. Then, this power is transmitted to the operating rod 10 via the pinion 16 and the rack 10c, and the operating rod 10 drops against the biasing force of the spring 14.

When the operating rod 10 is lowered in this way, 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. 2 (P in FIG. 1)
Direction), stand upright and then stop.

Next, when the operating rod 10 is further lowered by the threading motor 15, as shown in FIG. 2, the other end 8b of the pin 8 hits the positioning plate 3 and the threading shaft 7 is moved downward. Movement stops. At this time, the thread hooking plate 12 and the threading hook base 11 are in 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. It is directed to 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, and is hung between the thread locking portions 12c and 12d. Let the thread be M2.

Next, when the operating rod 10 is further lowered by the threading motor 15, as shown in FIG. 5, the spring 9 is compressed while only the operating rod 10 is lowered. At this time, since the operating rod 10 cannot rotate, one end 8a of the pin 8 of the threading shaft 7 is lowered.
Moving in the cam groove 10a, and together with the threading shaft 7, the threading hook base 11, the threading hook 11b, and the hook guide 11
a and 11c rotate clockwise in FIG. 4 (direction of arrow Q in FIG. 3). Further, at this time, the pin 13a of the thread hooking plate support 13 is lowered to the cam groove 10 of the operating rod 10.
b inside the thread hanging plate support base 13 and the thread hanging plate 12
However, in the opposite direction to the threading hook base 11, that is, in FIG.
Rotate counterclockwise at.

When the thread hooking plate 12 rotates in this way, the thread locking portions 12c and 12d draw a rotation locus that traverses the thread introduction 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 rotates in this way, the thread M1 hung between the thread gripping portions 12e and 12f abuts on 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 output shaft 15a of the threading motor 15 described above is rotated in the opposite direction, that is, in the counterclockwise direction in FIG. Then, this power is transmitted to the operating rod 10 via the pinion 16 and the rack 10c,
The operating rod 10 is raised. 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 shape of the thread locking portions 12c and 12d is such that when the thread locking portions 12c and 12d move in the opposite direction, the thread M2
As described above, the needle bar thread guide 5 intersects the rotation locus of the thread M2 and the thread M2 that has entered the back side of the thread introduction end 5a returns. Since it has a shape that does not exist, the thread M2 that has entered the back side of the thread introduction end 5a is left at that position, and thread hooking on the needle bar thread guide 5 is achieved.

When the operating rod 10 is raised by the threading motor 15 as described above, the threading hook 11b,
The hook guides 11a and 11c rotate in the opposite direction to the above and return to the position shown in FIG. At this time, thread the hook 1
The thread M1 captured by 1b passes through the needle hole 6a together with the threading hook 11b. 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.

When the operating rod 10 is further raised by the threading motor 15, the threading shaft 7 is raised together with the operating rod 10 and returns to the initial position shown in FIG. As described above, since the operating rod 10 is raised by the driving force of the threading motor 15 which is extremely stronger than the biasing force of the spring, the operating rod 10 can be raised well.

When threading and thread hooking on the needle bar thread guide 5 are completed as described above, the needle swing motor is driven,
The needle bar 2, the threading shaft 7, and the operating rod 10 are returned to the positions shown in FIG. At the time of sewing, the needle bar 2 swings in the swing range X, and sewing is performed without the rack 10c and the pinion 16 interfering with each other.

As described above, in the present embodiment, the threading shaft 7, the threading hook 11b and the operating rod 10 can be swung together with the needle bar 2, and the needle bar 2 is set within a predetermined swing range X during sewing. The rack 10c is swung to perform sewing without interfering with the pinion 16, and at the time of threading, the needle bar 2 is swung to a threading execution position Y, which is a swing position outside the predetermined swing range. When the needle bar 2 is located at the threading execution position Y, the rack 10c and the pinion 16 are meshed with each other, and the power of the threading motor 15 is transmitted to the operating rod 10 via the pinion 16 and the rack 10c. Since the rod 10 is configured to be lowered and raised to perform threading, the rack 1
0c can be directly provided on the operating rod 10 and constitutes the threading device described in the prior art.
The parts such as 08 can be eliminated,
After the threading, the operating rod 10 can be pulled up by the power of the threading motor 15 which is stronger than the urging force of the spring, and the lifting operation of the operating rod 10 can be performed well. Moreover, it is possible to avoid mounting the threading motor 15 on the needle bar support frame, and it becomes unnecessary to increase the size of the needle swinging motor of the needle rocking device.

Further, the present embodiment has the following effects. That is, the thread M1 on the end side that is hung on the thread hanging plate 12 is rotated by the rotation of the thread hanging plate 12 that is interlocked with the rotation of the thread passing shaft 7, and the thread passing hook that sandwiches the needle hole 6a of the sewing machine needle 6 is provided. The threading plate 12 can be arranged on the side opposite to 11b to perform a predetermined threading operation, and the thread threading plate 12 moves the thread M2 on the upstream side which is directed toward the threading shaft 7 to thread the thread N on its rotation locus N. In the range L on the shaft 7 side, the thread introduction end 5 of the needle bar thread guide 5 is
By disposing a, the thread M2 on the upstream side can be passed over the thread introduction end 5a and moved to the back side of the thread introduction end 5a with respect to the moving direction of the thread to hook the needle bar thread guide 5. Since it is configured so that threading can be performed, threading and thread hooking on the needle bar thread guide can be performed at the same time.

When the operator sets the thread M on the thread locking portions 12c and 12d of the thread hooking plate 12 and the thread gripping portions 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 with the needle hole 6 interposed therebetween, the thread M1 can be 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 and the like,
This rotation causes the yarn M1 to be stretched across the needle hole 6 to the opposite side of the yarn threading hook 11b, so that a complicated link mechanism such as the yarn threading device disclosed in JP-A-3-133485 is used. In comparison with a thread M that is stretched across the needle hole 6 on the opposite side of the threading hook 11b,
The structure can be simplified.

Further, at a normal time other than the time of threading, the operating rod 10 is suspended by a spring 14 as shown in FIG. 1 so that the power of the threading motor 15 can be turned off. Therefore, power saving of the device and threading motor 15
It is possible to improve the durability of the.

The operating rod 1 is driven by the threading motor 15.
When assembling adjustment (position adjustment) of the threading device by lowering and raising 0, the adjustment must be performed while driving the motor 15 one by one, and the adjustment becomes complicated. When it is desired to lower and raise the operating rod 10, and when the threading motor 15 fails, it is necessary to manually lower and raise the operating rod 10. In such a case, the needle bar 2 is After being positioned at the position shown in 1 (accurately, within the swing range of the needle bar 2 and at which the rack 10c and the pinion 16 do not interfere), the manual operation may be performed. In such a manual operation, the rack 10c and the pinion 16 are not meshed with each other and the output shaft 15a of the threading motor 15 does not have to be forcibly rotated. It's getting lighter.

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, for example, in the above-described embodiment, the thread can be threaded on the needle bar thread guide 5 together with threading, but the threading configuration is not always necessary. Further, regarding the configuration of the threading shaft, the operating rod, etc., for example, Japanese Patent Laid-Open No. 3-12
It is also possible to use the threading shaft, operating rod, etc. described in the specification of No. 8091.

In the above embodiment, the operating rod 1
The threading motor 15 is used as a driving source for raising and lowering 0.
However, the present invention is not limited to this, and an actuator such as an air cylinder may be used instead. In addition, the power transmission mechanism on the drive source side is set to the pinion 16
Although the power transmission mechanism on the operating rod side is the rack 10c, it is not limited to these.

In the above embodiment, the drive source (thread threading motor) 15 and the drive source side power transmission mechanism (pinion) 16 are fixed outside the swing range of the needle bar during sewing. However, instead of this, the drive source 15 and the power transmission mechanism 16 on the drive source side are made movable by other moving means, and the power transmission mechanism 16 on the drive source side is set to the power transmission mechanism on the operating rod side during threading. It may be connected to the (rack) 10c. That is, at the time of sewing, the drive source 1
5 and the power transmission mechanism 16 on the drive source side are positioned outside the swing range of the needle bar, and when threading occurs, the needle bar is stopped at the left baseline, for example, as shown in FIG. 15
Also, even if the power transmission mechanism 16 on the drive source side is moved to be connected to the power transmission mechanism 10c on the operating rod side, the same effect as that of the above-described embodiment can be obtained.

Furthermore, in the above embodiment, the threading execution position Y is located on the left side of the drawing from the left base line shown in FIG. 10, but it may be located on the right side of the drawing from the right base line. is there.

The threading execution position Y is made to coincide with the left base line or the right base line shown in FIG. 10, that is, the needle bar 2
It is also possible to stop when is located on the left baseline or the right baseline, and at this time, the power transmission mechanism on the drive source side and the power transmission mechanism on the operating rod side are connected, but in the case of such a configuration, This cannot be adopted because the power transmission mechanism on the drive source side collides with the power transmission mechanism on the operating rod side at the time of sewing, noise is generated, and both power transmission mechanisms are damaged.

[0055]

As described above, according to the threading device of the sewing machine provided with the needle rocking device of the present invention, the threading shaft, the threading hook and the operating rod can be rocked together with the needle bar, and sewing can be performed. Sometimes, the needle bar is swung within a predetermined swing range to perform sewing without interfering the power transmission mechanism on the operating rod with the power transmission mechanism on the operating rod, which is provided on the operating rod. When the needle bar is swung to the threading execution position, which is a swing position outside the predetermined swing range, and the needle bar is located at this threading execution position, the power transmission mechanism on the drive source side and the operating rod side The power transmission mechanism is connected, and the power of the drive source is transmitted to the operating rod through both power transmission mechanisms so that the operating rod can be lowered and raised to perform threading. The rod can be provided with a power transmission mechanism on the side of the operating rod, and the threading device described in the prior art can be used. Since parts such as a moving table and a guide bar are not required, the cost can be reduced, and the operating rod after threading can be pulled up by the power of the drive source stronger than the biasing force. The operating rod can be satisfactorily raised to improve the reliability, and it is possible to avoid mounting the drive source on the needle bar support frame, which makes it unnecessary to increase the size of the drive source of the needle rocking device. It is possible to avoid cost increase and noise increase.

[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 the needle bar shown in FIG. 1 is swung to a threading execution position and the operating rod is lowered to a predetermined position by the power of a drive source.

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.

FIG. 5 is a front view showing a state in which the operating rod of the threading device shown in FIG. 2 is further lowered by the power of the drive source.

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

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

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 by the power of the drive source.

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

FIG. 10 is a schematic explanatory view showing a swing range and a threading execution position when sewing the needle bar.

FIG. 11 is a schematic configuration diagram showing a simplified outline of the threading device described in Japanese Patent Laid-Open No. 3-128091.

[Explanation of symbols]

 2 Needle bar 6 Sewing needle 6a Needle hole 7 Threading shaft 10 Operating rod 10c Power transmission mechanism on the operating rod side 11b Threading hook 15 Drive source 16 Power transmission mechanism on drive source 17 Needle swinging device M1 Thread X When sewing Swing range of needle bar Y Threading execution position

Claims (1)

[Claims] 1. A threading device attached to a sewing machine equipped with a needle rocking device for rocking a needle bar, wherein said needle bar is movably supported and has a sewing needle supported at its lower end. And the threading shafts that are arranged parallel to each other and are rotatably and vertically movably supported, and operate in conjunction with the rotation of the threading shafts at predetermined positions in the axial direction provided on the threading shafts. By doing so, a threading hook that can enter and retract with respect to the needle hole of the sewing machine needle, and an operating rod that is engaged with the threading shaft and that is vertically movably supported are provided.
The threading shaft is lowered by lowering the operating rod and then further rotated to allow the threading hook to enter the needle hole, while the threading shaft is raised by raising the operating rod. By rotating the threading hook in the direction opposite to the above to retract the threading hook with respect to the needle hole, and by the advancing / retracting operation of the threading hook with respect to the needle hole, In a threading device of a sewing machine capable of threading by catching a thread from a thread supply source arranged on the opposite side, a drive source for raising and lowering the operating rod, and transmitting power of this drive source. A power transmission mechanism on the side of the driving source, and a power transmission mechanism on the side of the operating rod, which is provided on the operating rod so as to transmit power from the power transmission mechanism on the side of the driving source. The through hook and operating rod are The power transmission mechanism is connected to the needle bar when the needle bar is positioned at a threading execution position, which is a swing position outside the sewing swing range of the needle bar by the needle rocking device. A threading device for a sewing machine having a needle swinging device.