KR100634841B1 - Bobbin brake for sewing machine - Google Patents

Abstract

A device for braking a bobbin for a sewing machine is provided to prevent a lower thread from being disentangled by preventing idling of the bobbin by promptly stopping the bobbin when sewing work is terminated, thereby preventing entanglement of the lower thread. A perforated part(124) is formed at a book case(120) covering a bobbin(130). A through-part(114) is formed at a rotary kiln(110) covering the book case correspondingly to the perforated part. An air hose(200) sprays air through the through-part and the perforated part to a place where the through-part of the rotary kiln is placed when the rotary kiln is stopped. A switch valve(210) is installed at the air hose for opening and shutting a pipeline of the air hose, being controlled by a controller(300).

Description

Bobbin Brake for Sewing Machine

1 is an exploded perspective view showing a lower thread supply device for a sewing machine according to the present invention.

Figure 2 is a coupling diagram of the lower thread supply device for re-void according to the present invention.

3 is a cross-sectional view showing an installation state of the lower thread supply device and the braking device according to the present invention.

4 is a view showing the rotation direction of the bobbin and the air hose for injecting air to the bobbin according to the present invention.

5 is a view showing a braking device, a rotary kiln and a book case of the present invention.

FIG. 6 is a view showing the penetrating portion of the rotary kiln and the perforation portion of the bookcase by showing FIG.

<Description of the symbols for the main parts of the drawings>

100: shelf 102: drive device

110: rotary kiln 112: drive shaft

114: penetrating portion 120: book case

122: axis 124: perforation

130: bobbin 140: bobbin thread

150: book cover 200: air hose

210: on-off valve 220: compressor

300 controller

The present invention relates to a bobbin braking device for a sewing machine, and more particularly, to a bobbin braking device for sewing machines to prevent tangling of the lower thread wound on the bobbin by braking the bobbin after the sewing of the seat belt, that is, the sewing machine. .

In general, a vehicle is provided with seat belts (hereinafter referred to as seat belts) for each seat that restrain the body of the occupant to promote the safety of the occupant when the vehicle collides.

The seat belt is installed on the vehicle body in a three-point support manner, and the seat belt is wound to be accessible to a retractor fixed to the lower part of the vehicle body, and the end of the seat belt withdrawn from the retractor is installed at the upper part of the vehicle body. After being slidably latched to the upper anchor, it is slidably fixed to the lower anchor secured as a bolt to the vehicle body in front of the retractor.

As described above, the seat belts that are caught by the lower anchors are fastened to the lower anchors by sewing the ends of the seat belts on the lower anchors.

Briefly describing such a sewing machine, the sewing machine is usually combined with two threads divided into a lower thread and an upper thread and a needle that is driven to sew or sewn.

The bobbin thread is wound around the bobbin, the bobbin supply device including the bobbin is composed of a rotary kiln and a book case and a bobbin and a book cover wound around the bobbin,

The rotary kiln is rotated by the drive unit of the sewing machine, and the sewing work is performed by lifting the lower thread wound on the bobbin fitted in the bookcase and the book cover, which are fixed relatively, and being hung on the upper thread.

Such a conventional sewing machine is to trim the lower thread drawn from the bobbin through the trimming device configured to the sewing machine after the end of the sewing, that is, sewing machine work. However, when the sewing machine is finished, the rotary kiln is always stopped at a fixed position at the same time as the sewing machine is finished by the stopper configured in the sewing machine, whereas the bobbins in the bookcase and the book cover do not have a separate braking device, so that the lower thread is withdrawn. As the inertia acts as the bobbin is idle, there is a problem that the lower thread is drawn out as much as the idling amount and tangled.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, by forcing the bobbin after the sewing of the seat belt, that is, the completion of the sewing operation to prevent the idle before tangling of the bobbin thread wound on the bobbin It is an object of the present invention to provide a bobbin braking device for a sewing machine.

The present invention for achieving the above object, in the bobbin braking device for a sewing machine for sewing by supplying the lower thread from the bobbin is wound around the lower thread to the needle on which the upper thread is caught, forming a perforation in the book case surrounding the bobbin And a through part corresponding to the perforated part in a rotary kiln surrounding the bookcase, and an air hose for injecting air to the bobbin through the through part and the perforated part where the through part of the rotary kiln is located when the rotary kiln is stopped. And, the air hose is controlled by a controller, characterized in that the on-off valve for opening and closing the pipe of the air hose.

Preferably, the air hose is installed to be inclined to inject air in the opposite direction of rotation of the bobbin on one side of the bobbin facing the bookcase.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 are views illustrating a lower thread supplying device and a braking device according to the present invention.

1 and 2, the lower thread supply device of the present invention is configured on the lower surface of the shelf 100 of the sewing machine, and is connected to the drive shaft 112 connected to the driving unit 102 of the lower surface of the shelf 100. Rotating kiln 110 is rotated to wind the upper thread (not shown) in the lower thread 140, the bookcase 120 is inserted and accommodated in the rotary kiln 110 and protrudes the shaft 122 on one surface and And a bobbin 130 rotatably coupled to the shaft 122 of the book case 120 and having a bobbin thread 140 wound thereon, and a book cover 150 installed to cover the bobbin 130. .

5 and 6, a penetrating perforated portion 124 is formed on one surface of the bookcase 120 surrounding the bobbin 130, and a rotary kiln surrounding the bookcase 120 ( The through part 114 corresponding to the perforation part 124 is formed on one surface of the 110.

Here, the rotary kiln 110 is installed at the sewing machine at the end of the sewing operation is always stopped by a stopper (not shown) controlled by the controller 300, the penetrating portion of the rotary kiln 110 is stopped by 114 always coincides with the perforations 124 of the book case 120.

In addition, as shown in FIG. 3, the sewing machine, ie, the driving device 102, in which the penetrating part 114 is positioned when the rotary kiln 110 is stopped, is provided with a bobbin through the penetrating part 114 and the drilling part 124. An air hose 200 for spraying air to one side of the 130, that is, the surface facing the book case 120 is installed.

At this time, the air hose 200 is installed to be inclined to inject air in a direction opposite to the rotation of the bobbin 130, as shown in Figure 4, is injected from the air hose 200 Air is injected at a pressure of approximately 5 kgf / cm 2.

Therefore, the high pressure air is injected into the bobbin 130 in the opposite direction of rotation to act as a resistance, and the bobbin 130 is applied to the book cover 150 on the shaft 122 of the book case 120 by the injected air. The bobbin 130 is quickly stopped by the friction generated between the bobbin 130 and the book cover 150 by being moved to the side.

In addition, the air hose 200 is connected to the compressor 220, the air hose 200 is provided with an on-off valve 210 controlled by the controller 300, the injection of air is controlled.

Hereinafter, the operation of the bobbin braking device for a sewing machine according to the present invention configured as described above.

First, briefly explaining the operation of the lower thread supply device, the upper thread (not shown) guided and supplied by a needle (not shown) is passed through the fabric (not shown) to be delivered to the lower portion of the fabric to form a loop shape.

The upper thread formed a loop shape as described above is a drum surrounding the bobbin 130, the rotary kiln 110 is rotated by the rotation of the drive shaft 112 connected to the drive device 102, the upper thread is wound on the bobbin 130 is wound By rotating the outer circumference of the case 120 and the book cover 150, the lower thread 140 released from the bobbin 130 is entangled with the upper thread and raised to the upper fabric, so that sewing is performed.

Then, when the sewing operation is finished after the sewing operation as described above, a stopper (not shown) configured for the sewing machine by the controller 300 operates to stop the rotary kiln 110 at a constant position at all times.

Then, as shown in FIG. 3, the penetrating portion 114 of the stationary rotary kiln 110 is positioned in the same line as the perforation portion 124 of the book case 120, and air installed on the same line thereof. The on-off valve 210 of the hose 200 is opened by the controller 300 so that the air of the compressor 220 is at a pressure of approximately 5 kgf / cm 2 to one side of the bobbin 130 through the air hose 200. Sprayed.

At this time, since the air injected into the bobbin 130 is injected in the direction opposite to the rotation of the bobbin 130, as shown in Figure 4, it acts as a resistance to the rotation of the bobbin 130, the air injected in this way As a result, the bobbin 130 is moved on the shaft 122 of the book case 120 toward the book cover 150 to be in surface contact, thereby generating friction between the bobbin 130 and the book cover 150. The bobbin 130 is quickly stopped.

Therefore, after the sewing operation is finished, the bobbin 130 is braked quickly to prevent loosening of the lower thread 140 due to idling of the bobbin 130, thereby preventing tangling of the lower thread 140.

Then, after the stop of the bobbin 130 as described above, the controller 300 trims the lower thread 140 by controlling the trimming device (not shown) configured for the sewing machine.

As described above, according to the bobbin braking device for the sewing machine of the present invention, by stopping the bobbin quickly after the sewing of the seat belt, that is, the sewing machine, to prevent the bobbin idling to prevent loosening of the bobbin thread, There is an effect to prevent tangles.

Claims (2)

In the bobbin brake device for sewing machines for sewing by supplying the lower thread from the bobbin wound around the lower thread to the needle on which the upper thread is caught, Forming a perforated portion 124 in the book case 120 surrounding the bobbin 130, A through part 114 corresponding to the perforation part 124 is formed in the rotary kiln 110 surrounding the book case 120. Air hose 200 for injecting air to the bobbin 130 through the through part 114 and the perforation part 124 where the through part 114 of the rotary kiln 110 is located when the rotary kiln 110 is stopped. ), The air hose 200 is a bobbin braking device for a sewing machine, characterized in that the control valve 300 is controlled by the control unit 300 is installed on and off valve 210 for opening and closing the conduit of the air hose (200). The method of claim 1, The air hose 200 is a bobbin braking device for a sewing machine, characterized in that inclined so as to spray air in the opposite direction of rotation of the bobbin 130 on one side of the bobbin 130 facing the book case 120.

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