JPS6156691A - Yarn holder of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a thread holding device ml for a sewing machine that holds cut sewing thread.

[Prior art]

Conventionally, there was a crab shown in Figure WrJ1 as this type of thread bed holding equipment. (1) is the sewing machine head, (2) is the revision plate.

(3) is thread handling, (4) is floor holding, (5) is upper thread,
(6) is the throat plate, (7) is the needle, and (8) is the air cylinder.

Referring to FIG. 2, conventional yarn handling (3) will be explained. In the figure, (5) is a thread that is supported on the floor and passes perpendicularly to the plane of the paper. (2) is Itosube vya.

(to) is the threading part, and α is the hook threading part.

Next, the operation will be explained. A series of sewing operations is completed,
The needle thread (5) cut below the throat plate (6) is passed through thread handling (
The needle thread (5) is separated by the reciprocating motion of (3).
Hang it on the thread hanging part and pull it as it is to make the medical load spring (
4). Here, a path is determined so that the thread is separated and reciprocated so as to pass above the upper thread (5) which is free to be pulled. During this reciprocating operation of the thread handling (3), the upper thread (5) U slides on the thread vector part Q2 of the thread handling (3), and the hook threader passes over the part α→. Next, during the return movement of thread handling (3), the upper thread (5)
The hook thread hanger is hooked on part α4, and the cloth? Pull up the free part 4 of the needle thread (5) that runs through it, and
In this case, before the return movement of the thread handling (3) is completed, the hook thread hook is attached to the floor by the portion α4 and the holding spring (4).

Since the shape of the yarn handling section of the conventional yarn holding device is configured as described above, even if the yarn held on the floor is caught in the hook thread hook section, the fabric f! : There was a risk of it coming off due to the length of the free end ahead of the fabric of the needle thread passing through it being short, or due to twisting of the thread used. Also.

Since the reciprocating movement path for handling the thread and the position of the upper thread are limited, there are also drawbacks such as poor ease of assembly and difficulty in adjustment.

[Summary of the invention]

This invention was made in order to eliminate all the drawbacks of the conventional ones as described above, and provides a yarn holding device that can hold the ends of cloth yarns cut by pneumatic pressure (negative pressure) without using yarn handling. The purpose is to

[Overwhelming invention] 1□ Below is an example of this invention't-/
I will explain about A. In Figure 3,! Are the same symbols as in Figure 1 the same or equivalent parts? show. A cylindrical member for sucking and holding the suture thread is shown, and (10') shows a state in which the cylindrical member αO is advanced by an air cylinder (8). α is the air pipe A, <124 is the position that generates negative pressure, (l) is the device that generates negative pressure (air pipe B that supplies air to rumor 1, and (b) is the position that generates negative pressure. Air pipes C and Q5 for discharging air from Keitake are connected to the hook of the sewing machine, (II) the bobbin case that supplies the bobbin thread, Q, the force to the bobbin thread, and (to) the cylindrical member αat air cylinder (8). It is a connecting member for connecting.

Next, the operation will be explained. Aim at the broom 8.

Upper thread (5):! , - and when the lower thread αη is cut, the cylindrical member α0 approaches the cut upper thread (5) due to the advance of the air cylinder (8), and the upper thread (5) with one end free 5) into a cylindrical member (
10'). After a certain period of time, the air cylinder (8) retreats and the cylindrical member +10')α
0 retreats while suctioning and holding the needle thread (5), and returns to the position without becoming an obstacle during the 5th sewing.

Pass the air pipe Aα1) from Klt that generates negative pressure to the cylindrical member αOI+? : Conveys negative pressure to the upper thread (
5) The energy required to attract the tnle.

Next, a sectional view of a device (goods) for generating negative pressure is shown in FIG. 4, and its operation will be explained. (1) is a nozzle part. When the compressed air supplied from the air pipe BO effect passes through the nozzle part (4) at high velocity, the air on the air pipe A (2) side is attracted by the viscous flow, thereby generating negative pressure. Therefore, an air flow is generated from the air pipe A (6) side to the air pipe C (b) 111, which causes the upper thread to be cut. l - Aspirate.

In the above embodiment, the operation of suctioning and holding the upper thread (5)' after cutting has been described, but in the sewing operation of the sewing machine, it is also highly necessary to hold the lower thread α7)'t after cutting. In order to suction and hold these bobbin threads αl, the tip of the cylindrical member αQ can be easily repurchased by placing the tip of the tubular member αQ near the cut free end of the bobbin thread Q7) at the bottom of the throat plate (6). It has the same effect as the above disaster overwhelm.

〔Effect of the invention〕

As described above, according to the present invention, since the grooved membrane is used to suction and hold the cut thread by negative pressure, the cylindrical member of this thread holding device has higher accuracy than the conventional one when it is close to the sewing thread. The process is extremely rough and does not require high precision for each part or assembly, making the device inexpensive. In addition, the conventional thread handler has a shape similar to a knife9, and it moves back and forth near the sewing worker's hand at high speed, which is very dangerous, but according to the present invention, the cylindrical However, even if it hits your hand, there is little risk of injury. Furthermore, with conventional devices, thread retention errors often occur due to the unstable position of the upper thread.

According to this invention, yarn holding errors do not occur and work efficiency is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional thread bed holding device II, and Fig. 2 is a detailed plan view of the thread handling used in the conventional thread holding device.
FIG. 8 is a front view of a thread holding device using a single pressure mechanism according to the present invention, and FIG. 4 is a sectional view of the device for generating negative pressure. In the figure, (1) is the sewing machine head, (2) is the mounting plate, (
3) is the thread control, (4) is the holding spring, (5) if' needle thread, and (6) is the throat plate. (7) is a needle, (8) is an air cylinder, 4 is a cylindrical member, α
1Jt-t air vibe A, (2) is a device that generates negative pressure, (2) is air pipe B, (d is air pipe C, (to) is the hook of the sewing machine, αυ is the bobbin case, αη is the lower thread, (
to) is a connecting member. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts. Daisakaito Masuo Oiwa Figure 3 Figure 4

Claims (1)

[Claims] It consists of a sewing machine for sewing, a device for generating negative pressure, and a cylindrical member for suctioning thread ends, and the cylindrical member connected to the device for generating negative pressure is placed near the sewing machine needle. Alternatively, a thread holding device for a sewing machine is characterized in that it is placed at least in the vicinity of a hook of a sewing machine, and sucks and holds cut sewing thread.