JPH0363400B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for automatically guiding (thread distribution) needle thread of a sewing machine to a regular path from a thread supply source to a sewing needle. be.

[Conventional technology]

When performing sewing work using a sewing machine, before threading the sewing needle, the thread is passed from a thread supply source such as a thread spool to a number of predetermined paths of the sewing mechanism, including the thread tension plate, thread take-up lever, thread take-up spring, and thread hook. It is necessary to insert the thread into the thread hole of the sewing needle. All of these operations are performed manually and are extremely complicated, and especially for beginners, it is often the case that the threading order is incorrect.

For this reason, in order to show the sewing machine user the correct thread path, the order of thread distribution is displayed using a graphical display or an LED (light emitting diode).

[Problem that the invention seeks to solve]

However, in the conventional examples as described above, although there are differences in display methods, all of them only indicate the thread path, and the troublesomeness of manually distributing the thread has not been solved in any way.

In an attempt to solve the above-mentioned drawbacks, conventionally, for example, Japanese Patent Laid-Open No. 56-34388 or Japanese Patent Laid-Open No. 58
A proposal for automating thread distribution has been disclosed in Publication No. 12682 and the like. However, in order to avoid duplication with the above-mentioned cited documents, duplicate explanations will be omitted, but all of these proposals require manual preparation in which the upper thread is taken from the thread spool and guided along the thread path to the needle position. None required other auxiliary operations and was fully automated.

The present invention has been developed in view of the above-mentioned circumstances, and the thread is pulled out from the thread spool, set on a predetermined adjacent hook, and the thread hook switch is turned on, thereby fully automatically distributing/threading the thread as required. The object of the present invention is to provide an upper thread guiding device that can perform the following operations.

[Means for solving problems]

Therefore, in the present invention, the drive roller that rotates close to the thread spool and the path from the roller portion to the sewing machine frame position close to the sewing needle are spanned through a plurality of guide means, and at least An endless wire with one thread gripping hook fixedly attached,
A thread tension device is placed on the front side of the sewing machine frame and has two thread tension discs on the horizontal axis, and a thread tension device is placed in parallel with the thread tension device on the front side of the sewing machine frame and opens upward. A thread take-up is formed that forms an introduction part and moves up and down in conjunction with the sewing machine, and a hook-shaped thread hook is formed at the tip of the thread take-up, which is lowered from an approximately vertical standby position through between the thread tension plate and the thread thread take-up. A face plate that can be rotated to the threading position, and a face plate that grips the end of the upper thread from the thread spool and engages with a moving thread gripping hook to reverse the thread gripping hook and hold the upper thread in a standby position. The above objective is achieved by providing an auxiliary plate A that is hung over the threading part of the material.

[Effect]

With the above configuration, the sewing machine user simply pulls out the upper thread from the thread spool, sets it on a nearby predetermined hook, and turns on the threading switch, and the predetermined threading is automatically performed. Finally, the sewing machine can begin sewing by threading the sewing needle with a conventional threader.

〔Example〕

The present invention will be explained below based on examples.
1 to 5 are perspective views showing the structure and operation order of an embodiment of the upper thread automatic guide device according to the principles of the present invention. Further, FIG. 1a is an enlarged cutaway side view of the tip portion of the face plate material 7 in FIG. 1.

(Configuration) FIG. 1 shows the machine frame (frame head) F of the sewing machine with a two-dot chain line, and shows the arrangement of the main components of this embodiment. 1 indicates a thread spool, S indicates its upper thread, and N indicates a sewing needle. Reference numeral 4 denotes a drive roller of an endless wire 5, which is driven, for example, on an upright shaft by the rotation of the main shaft (upper shaft) of the sewing machine (not shown) or by a dedicated drive motor, etc., and is mounted on the sewing machine frame F, etc. (not shown). It is configured to be activated by a threading switch. An endless wire 5 is wound around the roller 4 via idle rollers 15, 16, and 17, which are respectively arranged on the machine frame for guiding purposes.
Hooks A/B2/3 for threading are fixed to the wire 5 at a position adjacent to the illustrated thread spool 1 and at a portion of the idle roller 17 adjacent to the sewing needle N portion, respectively. Reference numerals 12 and 11 denote a thread tension device which is arranged on the front side of the machine frame F of the sewing machine and has two thread tension discs 13 on the horizontal axis, and a thread introduction section which is arranged in parallel with the thread tension device and opens upward. 11a, which is a take-up lever that moves up and down in conjunction with the upper shaft of the sewing machine. Reference numeral 7 denotes a face plate member fixedly attached to the rotating shaft of the stepping motor 8, and the end portion 7a of the face plate member 7 has a hook shape with a thread take-up spring 6 in the form of a spiral torsion coil as shown in FIG. 1a. It has a threading part 7b. Then, the face plate material 7 is lowered from the almost vertical standby position through the space between the thread tension plate 13 and the thread take-up lever 11, and is moved to a threading position (hereinafter referred to as a predetermined position) where the upper thread S is threaded between the thread tension disc 13 and the thread take-up lever 11. ) can be rotated. 9
and 10 refer to an auxiliary plate A for reversing the threading hook A2 which grips the end of the needle thread fixed to the machine frame F from top to bottom and guiding it to a predetermined path, and a threading hook 14 for threading the needle thread S from the thread spool 1. This is an auxiliary plate B that guides the thread tension plate 13 through the thread tension plate 13.

(Operation) Next, the operation will be explained. First, as shown in FIG. 1, the upper thread S is pulled out from the thread spool 1 and hooked onto the hook A2 for gripping it. When the roller 4 rotates in the direction of the arrow shown by turning on a threading switch (not shown), the endless wire 5
moves, and each hook A, B fixed to the wire 5
2 and 3 also start in synchronization with this.

Next, in the second step, the moving hook A2
However, when reaching the auxiliary plate A9, the hook A2 is approximately
It is reversed 180 degrees and the upper thread S passes over the tip 7a of the face plate 7.

FIG. 3 shows a state in which the hook A2 has passed through the auxiliary plate A9 and the upper thread S has engaged with the thread take-up spring 6 on the upper part of the face plate member 7. Hooks A/B2/3 each advance to the positions shown.

Next, in FIG. 4, when the hook A2 is turned about 180 degrees by the auxiliary plate A9 and the needle thread S is hooked on the thread take-up spring 6 of the face plate member 7, the stepping motor 8 rotates in the direction of the arrow, and the hook A2 is rotated in the direction of the arrow. At the same time as the sewing needle descends in the N direction, the tip of the face plate material 7 also rotates and descends. The starting signal for the motor 8 is generated by a sensor placed in the path of the hook A2, or by measuring the elapsed time since the roller 4 is started.

Next, in FIG. 5, the face plate material 7, whose tip end is rotated and lowered to a predetermined position by the motor 8, hooks the thread S to a thread hook 14 fixed to the machine frame etc. on the way, and threads it along the auxiliary plate B10. It leads to the thread tension disc 13 of the thread tension device 12. At the same time, the needle thread S is hooked on the thread introduction part 11a of the thread take-up lever 11 between the thread take-up spring 6 and the hook A2 that has descended in the direction of the sewing needle N.
Thread the thread to end the automatic threading. At this time, the hook A2 is attached to the idle roller 1 which is close to the sewing needle N.
7 (on the contrary, the hook B3 returns to the starting position of the hook A2 in FIG. The needle hole Na of the sewing needle N is
Finish all needle threading by inserting the thread into the thread.

As with the starting/stopping of the motor 8, means such as a sensor or a timer can be used to generate a rotation stop signal for the roller 4 when the hook A2 reaches the idle roller 17 position.

(Other Embodiments) In the above embodiment, five idle rollers 15, 16, and 17 were used to guide the endless wire 5, but any means that can smoothly guide the wire may be used. Of course, it is not limited to.

Further, although a thread passing spring 6 is provided on the face plate material 7, the original purpose of this thread taking spring 6 is to improve stitching and prevent skipped stitches, and is not an essential condition for the purpose of the present invention. Can be omitted.
Therefore, the hook A2 passes through the auxiliary plate A9, and the upper thread S is attached to the hook-shaped thread hooking part 7 of the tip 7a of the face plate material 7.
b.

Furthermore, the number of thread gripping hooks may be at least one.

〔Effect of the invention〕

As explained above based on the examples,
According to the present invention, by first pulling out the thread from the thread spool, gripping it with a predetermined hook, and turning on the threading switch, the thread can be fully automatically distributed to the vicinity of the sewing needle. .

[Brief explanation of drawings]

1 to 5 are perspective views illustrating the configuration/operation sequence of an embodiment of the needle thread automatic guide device according to the present invention, and FIG. 1a is an enlarged side view of the tip of the face plate material in FIG. 1. 1...Itokoma, 2/3...Hook A/B, 4...
Drive roller, 5... Endless wire, 7... Face plate material, 8... Motor, 9/10... Auxiliary plate A/
B, 11... Balance, 13... Thread tension plate, 14...
Thread hook, 15, 16, 17... Idler roller (guiding means), F... Machine frame, N... Sewing needle, S... Needle thread.

Claims (1)

[Scope of Claims] 1. A drive roller that rotates close to the thread spool, and a path extending from the roller portion to a sewing machine frame position close to the sewing needle via a plurality of guide means, and at least one An endless wire with fixed thread gripping hooks is placed on the front side of the sewing machine frame, and two
a thread tension device having two thread tension discs, and a thread take-up that is arranged in parallel with the thread tension device on the front side of the sewing machine frame, forms a thread introduction section that opens upward, and moves up and down in conjunction with the sewing machine. a face plate member having a hook-shaped threading portion formed at its tip and rotatable from a substantially vertical standby position to a threading position that passes between the thread tension disc and the thread take-up lever and descends; and an auxiliary plate A that grips the upper thread end, engages with the moving thread gripping hook, reverses the thread gripping hook, and threads the upper thread onto the thread hooking part of the face plate material in the standby position. An automatic upper thread guide device for a sewing machine, characterized by: