JPS61293494A - 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 Field of Industrial Application This invention relates to a sewing machine that allows anyone to thread the sewing machine easily and easily.

Conventional sewing machines have many parts where the thread must be threaded or threaded, such as various thread guides, thread tension devices, thread take-up springs, thread take-up levers, and needles. You have to pull the thread back and forth or from side to side to thread the thread or thread it through the holes one after another.You have to raise or lower the thread, or change direction by pulling it back and forth or sideways to thread the thread or thread it in the order. Threading is quite troublesome and time-consuming, and it is not easy for beginners, and is one of the reasons why sewing machine work is tedious.

Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned problems, and it is possible to easily and simply thread the thread through the thread take-up lever, thread take-up spring, and thread tension device by simply operating the thread downward. This is what I did.

A means for solving the problem, that is, the present invention, is to reciprocate in the lateral direction between the upper and lower guides through which the thread is passed, to capture and pull the thread between both guides in the forward stroke, and to pull the thread to the thread in the backward stroke. A thread tensioner includes a thread take-up spring that engages and bends the thread when the thread is pulled in one direction, and moves back to take in the thread when the thread tension is relaxed, and a pair of tension discs placed on the left and right. This device is characterized in that the devices are arranged in the vertical direction, and the thread is threaded through the device in order from the top.

Here, the thread is passed between the upper and lower guides of the thread take-up and the tension plate of the thread tension device, and is engaged with the thread take-up spring. It is desirable to be able to thread the thread by operating the thread downward, and it is more desirable that the vertical plane passes through a thread guide that guides the thread pulled out from the spool. This is because it becomes possible to thread the thread through the thread take-up lever, thread tension device, and thread take-up spring simply by operating the thread downward within the plane.

Note that the upper and lower guides may be provided individually or may be formed into one component.

For example, as shown in FIG. 1, the thread take-up spring crosses a guide groove 15 for threading, which has a guide groove 15 cut out in a V-shape and an eye hole 16 continuing to the end of the groove. 16
(in the opposite direction), as shown in Figure 5, those that are biased in the direction of rising inside the sewing machine and take in the thread in an expanded state, and as shown in Figures 6 and 7. Examples include those provided in a thread tension device.

The second feature of this invention is that a slit is formed in the sewing machine frame, and the above-mentioned thread take-up device, thread tension device, and thread take-up spring are placed in the sewing machine body corresponding to the slit, and the thread is passed through the slit. This allows threading the thread between the thread tension discs of the thread tension device and threading the thread onto the thread take-up spring.

Here, the slits may be formed only at required locations on the sewing machine frame, or they may be formed from the top plate to the lower end of the front surface (in the latter case, the slits may be curved or bent if necessary, but preferably It is formed straight and passes through the needle or its vicinity.

In the sewing machine constructed as described above, it is also desirable to provide a thread guide at the end of the slit or an extension thereof, as described above. By simply passing the thread that has passed through the thread guide through the slit, the thread can be passed through the thread take-up device, thread tension device, and thread take-up spring.

Note that the thread take-up lever, take-up spring, and thread tension device are arranged in a preferable order depending on the sewing machine, and the order in which they are arranged in the vertical direction does not matter.

Embodiments In FIGS. 1 to 3, a sewing machine main body 1 is provided with a slit 3 through which a vertical plane including a total 2 passes through the top plate and the entire front surface, and a thread take-up spring 4 is provided inside the main body. and,
Dial tensilan B is provided with part of the dial exposed.

The take-up device A has a frame plate 7 with elongated holes 6 formed in the horizontal direction and whose left and right ends are attached to the sewing machine body, and whose base end is pivoted to the sewing machine body and whose middle part rotates in conjunction with the upper shaft 8. The balance 12 is connected to a crank 9 by a link 11, and has a hook-shaped distal end protruding from the elongated hole 6, and the intermediate portion is bent into a U-shape to surround the elongated hole 6 with the U-shaped portion. The mounting plate 13 includes a mounting plate 13 that is attached to one side of the frame plate 7, and a cut groove 14 is formed in the U-shaped portion of the mounting plate 13 at a location corresponding to the slit 3. A V-shaped notched guide groove 15 and an eye hole 16 continuing to the groove end are formed at a location corresponding to the slit 3, and the thread take-up spring 4 attaches the coil portion to the upper side of the mounting plate.
extending across.

The dial tension B has a similar structure to a known one, and is provided with a pair of adjustment discs 18 aligned with the slit 3. 19 is a thread guide provided at the end of the slit.

Threading the sewing machine is done by pulling out the thread from a spool (not shown), hooking it onto the thread guide 19, passing it through the slit, and lowering it downward while pulling it toward you.This first threads the thread between the tension discs. Then, it is introduced into the guide groove 15, presses down the thread take-up spring 4, passes through the eye hole 16 and also passes through the cut groove 14, and is stretched to a total of 2. When threading through the eye hole - Thread take-up spring 4 pushed down to star eye hole 16
Take-up 1 moves back and takes in the thread as the thread tension loosens.
2, when the sewing machine is driven, the cut groove 1 is cut in the forward stroke.
Hook the thread passed through 4 and pull it in the horizontal direction. In the backward stroke, the thread traction is released.

FIG. 4 shows another example of the mounting plate, in which a guide groove 15 and an eye hole 16 are formed in the U-shaped part of the mounting plate 13 and also serve as the above-mentioned cut groove 14, and protrude across the guide groove 15. The thread take-up spring 4 is displaced in the front-rear direction and is normally biased in the opposite direction to the eye hole 16.

FIG. 5 shows another example of the thread take-up spring, in which the thread take-up spring 21 is attached to the inside of the sewing machine frame, and the thread take-up spring 21 is attached to the inside of the sewing machine frame.
1 is such that the thread passed through the slit engages with its tip, and when the thread 22 is pulled, it moves to the solid line position in the figure, and when it is loosened, it moves to the imaginary line position, and the thread is taken in. There is.

6 and 7 show other examples of the thread take-up spring, in which the coil portion of the thread take-up spring 26 is attached to the spindle 25 of the thread tension device built into the sewing machine frame, and the thread take-up spring is connected to the tension plate 27.
The thread 22 is stretched in the axial direction on the circumferential surface of the thread 22 and passed between the tension discs so that the thread 22 is also applied to the thread take-up spring 26.

In each of the above-described embodiments, the thread take-up spring is provided very close to the thread take-up thread, and the thread path to the needle tip is shortened, which has a favorable effect on the sewing tension. In other words, due to the thread absorption action of the thread take-up spring, the slack in the needle thread loop that has passed through the hook is quickly absorbed, and the amount of thread elongation in the above-mentioned path is also reduced, so that even thread with a large amount of elongation and contraction will not form a needle thread loop. Although the slack can be absorbed comparatively well, in this embodiment, the thread path to the needle tip is further shortened, which has a more favorable effect on the sewing condition.

Effects of the Invention According to the present invention, since the thread tension device, thread take-up lever, thread take-up spring, etc. are arranged in the order in which the thread is threaded from the top, there is no confusion in the order, and there is no problem in threading the thread, unlike in the past. There is no need to raise or lower the sewing machine, and there is no need for troublesome work such as threading the sewing machine, making it easier to thread the sewing machine.

Furthermore, if you provide a slit in your sewing machine so that you can thread the thread through the slit, you won't have to worry about threading the thread through the thread tension device, thread take-up lever, thread take-up spring, etc. Threading can be carried out, making it even easier to thread the sewing machine.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts of a sewing machine according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view, Fig. 4 is a partial perspective view showing another Li type, and Fig. 5 is a further different one. FIG. 6 is a partial front view of another embodiment, and FIG. 7 is a side view of the same embodiment. 19. Sewing machine body 20. Needle 36. Slit 40. Thread take-up spring 71. frame board
I29. Balance 130. Mounting plate 143. Cut groove 161. Eye hole 190. Thread guide 218. Thread take-up spring 22. , thread 269. Thread take-up spring

Claims (1)

[Claims] 1. Reciprocating in the lateral direction between the upper and lower guides through which the thread is passed;
There is a thread take-up that captures and pulls the thread between both guides in the forward stroke, and releases the tension on the thread in the backward stroke, and when the thread is pulled in one direction, it engages and bends the thread, and when the thread tension is relaxed, it moves backward. The sewing machine 2 has a thread take-up spring that takes in the thread, and a thread tension device with a pair of tension discs arranged on the left and right, arranged in the order in which the thread is threaded from above.The vertical plane passing through the needle or its vicinity is the guide of the thread take-up device. The sewing machine 3 according to claim 1, which passes between the tension plate of the thread tension device and the thread take-up spring, the sewing machine 4 according to claim 2, whose vertical plane further passes through the thread guide, and the sewing machine frame. a thread take-up that forms a slit in the thread and reciprocates in the horizontal direction between the upper and lower guides through which the thread is passed, captures and pulls the thread between both guides in the forward stroke, and releases the pull on the thread in the backward stroke; A thread take-up spring that engages and bends the thread when the thread is pulled in one direction, and moves back to take in the thread when the thread tension is relaxed, and a thread tension device with a pair of tension discs arranged on the left and right to correspond to the slit. The sewing machine 5 is arranged in the order in which the thread is threaded from above, and by passing the thread through the slit, the thread can be passed between the guide of the thread take-up device and the tension plate of the thread tension device, and the thread can be threaded. The sewing machine 6 according to claim 4, which is formed so that a vertical plane passes through the vicinity thereof, and the sewing machine according to claim 5, which has a thread guide provided at the end of the slit.