JPS63294896A - Lock stitch sewing machine used in both of bobbin abset and present states - 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 A. Field of Industrial Application This invention relates to a device for a lockstitch sewing machine that can sew with or without a bobbin case. After winding the bobbin, I had to set the bobbin, and while I was sewing, I could no longer sew and realized for the first time that there was no bobbin thread, and each time I had to wind the thread around the bobbin and set the bobbin in the bobbin case. , I had to re-sew it several times a day.

Sufficient attention was always required to check whether the bobbin thread was threaded or not.

C. Problems to be solved by the invention This invention has a bobbin thread that allows for continuous sewing without setting the bobbin in the bobbin case, and does not require work such as winding the bobbin thread on the bobbin. Since there is no need to pay attention to whether the sewing machine is sewing or not, there is no need to re-sew for that purpose, and you can set the bobbin and sew as needed.

2. Means for Solving Problems This invention will be explained based on the drawings. In Figure 1, the gear of the shaft (1) in B is brought out from the shaft holder in H, and the pipe in A is inserted. Drill holes in this shaft and pipe as shown in Figure 2 B, Figure 3 A, and then create holes C, D in Figure 4.
Make a hole in E in the same way, insert the thread groove and hole at part 7 of E in Figure 4, pass the bobbin thread into E through the hole, and take out the thread at 8. Is the same. The problem is to make holes A, BC, D, and E, pass the bobbin thread through it, take it out once, pass it through the thread groove and hole number 7 in E, put it inside E, and take it out at number 8.

C scoops up and rotates the upper thread of the 5 needles shown in Figure 1, and the upper thread becomes E as shown in Figure 4.
The needle thread 5 scoops up the bobbin thread sticking out at 8 and the bobbin thread comes out into the needle hole, allowing you to sew continuously.

You can also attach a bobbin and sew shorter lengths if necessary. In this case, attach the bobbin to the bobbin case E in Figure 4. 21 in Figure 4 inserts a part of B and 22 in Figure 2 and fixes with screws 19 and 20 in Figure 4.

Figure 5 shows the threading machine. As a result, A, B, CD, E,
Thread the thread through.

E. Effects of the Invention As explained above, this invention is surprisingly simple, although it is necessary to lengthen the shaft of a conventional lockstitch sewing machine, attach a thread guide pipe, and drill holes in the rotary hook and fixed hook to manufacture the bobbin case. It can be modified to.

[Brief explanation of the drawing]

Figure 1 shows a part of the main body of the sewing machine, part of the invention, and the side surface of the hook. Figure 2 is a cross-sectional view of the hole in the shaft. Figure 3 is a cross-sectional view of the thread guiding pipe. Figure 4 is C. Rotating hook, D fixed hook, and E bobbin case cross-sectional view Figure 5 shows device 1 for threading thread through long holes A, B, C, D, and E.
, 2 is the gear 3, 4 is the shaft 5, the needle 6 is the pulley 7, the groove and hole 8 where the thread passes through, the groove and hole where the bobbin thread comes out 9, 10, 11, 12, 13, 14, 15, 16, 17
, 18... is the thread H is the oil seal 19, 20 is the fixing screw

Claims (1)

[Claims] For a lockstitch sewing machine with or without a bobbin, when sewing continuously without a bobbin, pass the bobbin thread through A, B, C, D, and E in the bobbin case in E. Pass the bobbin thread through the thread groove and hole 7 in Figure 4 into the bobbin case E and bring out the threads H and I in Figure 1 to sew continuously. There is also a device hook that allows you to sew in the conventional manner by setting a bobbin in the bobbin case E in Figure 4.