JPH0318480B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a sewing machine that allows anyone to easily and easily thread the sewing machine.

Prior Art Sewing machines have many places where 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 left and right to thread the thread or thread it through the holes one after another, and you have to raise or lower the thread, or change direction by pulling it back and forth or sideways to thread the thread in sequence. Threading and threading the sewing machine is troublesome and time-consuming, and is not easy for beginners, which is one of the reasons why sewing machine work is a tedious task.

Problems to be Solved by the Invention The present invention has been made in view of the above problems, and it is easy and simple to thread the thread through the thread tension device, thread take-up spring, and thread take-up by simply operating the thread in one direction from top to bottom. It was designed so that it could be done.

Means for Solving the Problem That is, the present invention has a thread tension device in which a pair of tension discs are arranged on the left and right, and a thread tension device that engages and bends the thread when the thread is pulled in one direction, and moves back when the thread tension is relaxed. A thread take-up spring that takes in the thread, and a thread take-up that reciprocates in the horizontal direction between the upper and lower guides through which the thread is passed through the cut groove for introducing the thread, and captures the thread between both guides during one of the reciprocating strokes. and in the order in which the thread is threaded from above, and in a position where the vertical plane passing through the needle and its vicinity passes through the cut groove leading to the guide provided between the tension plates of the thread tension device and on both sides of the thread take-up lever, and crosses the thread take-up spring. It is characterized by the fact that it is arranged so that the threads are passed in order from the top.

Here, the thread is passed through the cut groove between the upper and lower guides of the thread take-up lever and the tension plate of the thread tension device, and is engaged with the thread take-up spring. It is preferable that the thread be threaded by operating from top to bottom within a vertical plane passing through the needle or its vicinity, and it is more preferable that the vertical plane pass through a thread guide that guides the thread pulled out from the spool. desirable. This is because, after threading the thread through the thread guide, the thread can be passed through the thread tension device, thread take-up spring, and thread take-up by simply operating the thread downward in a vertical plane.

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

As mentioned above, the balance has a mechanism that captures the thread between the guides in one of the reciprocating strokes and pulls it to absorb the slack in the thread, and in the other stroke, releases the traction on the thread to absorb the slack in the thread. There are two types of guides that are used in either round trip, as shown in Utility Model Publication No. 26-750, Utility Model Publication No. 37-19122, Utility Model Publication No. 49-9493, and Japanese Unexamined Patent Application Publication No. 60-139282. There is a type that captures the thread and automatically threads it through the eye hole. Note that catching here refers to engaging the engaging part or passing the thread through the eye hole during towing, and includes the process up to engaging the engaging part or passing the thread through the eye hole. Make it not exist.

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), as shown in Figure 5, there are 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 thread tension devices.

The second feature of the present invention is a thread tension device in which slits are formed vertically in a straight line in the sewing machine frame, and a pair of tension plates are arranged on the left and right sides of the slit, and a thread tension device is arranged across the slit to hold the thread. When the thread is pulled in one direction, it engages with the thread and bends, and when the thread tension is released, it moves back and takes in the thread, and the thread passes through the cut groove for thread introduction connected to the slit, respectively. By reciprocating in the horizontal direction between the upper and lower guides to be threaded, and a thread take-up that captures the thread between both guides in one of the reciprocating strokes, the thread is placed in the order in which the thread is threaded from above, and the thread is threaded through the slit. The thread can be threaded between the tension discs of the thread tension device and the guide of the thread take-up device, and the thread can be threaded onto the thread take-up spring.

Here, the slits may be formed only at required locations on the sewing machine frame, or may be formed from the top plate to the lower end of the front surface. In the latter case, the slits preferably pass through the needle or its vicinity.

In the sewing machine constructed as described above, it is 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 threaded through the thread tension device, thread take-up spring, and take-up thread.

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.

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

The balance device A has a frame plate 7 which has an elongated hole 6 formed in the horizontal direction, has both left and right ends attached to the sewing machine body, has a base end pivoted to the sewing machine body, and has an intermediate part that rotates in conjunction with an upper shaft 8. A balance 12 is connected to a moving crank 9 by a link 11, and has a hook-shaped tip protruding from the elongated hole 6, and a middle portion is bent into a U-shape and the U-shaped portion is connected to the elongated hole. The mounting plate 13 is attached to one side of the frame plate 7 so as to surround the frame plate 6, and the mounting plate 13 has a slit 3 in a U-shaped portion.
A cut groove 14 is formed at a location corresponding to the slit 3 on the upper side, and a V-shaped guide groove 15 and an eye hole 16 continuing to the groove end are formed at a location corresponding to the slit 3 on the upper side. It is attached to the upper side of the mounting plate and normally extends across the cut groove 14.

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

Threading the sewing machine is carried out by pulling out a 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. As a result, the thread is first passed between the tension discs, and then introduced into the guide groove 15 and the thread take-up spring 4.
is passed through the eye hole 16 and the cut groove 1 is pushed down.
4 and is extended to needle 2. When the thread is passed through the eye hole, the thread take-up spring 4, which is once pushed down to the eye hole 16, moves back as the thread tension is relaxed to take in the thread. When the sewing machine is driven, the thread take-up 12 reciprocates, and in one stroke it hooks the thread passed through the cut groove 14 and pulls it in the lateral direction. Then, in the return stroke, the tension on the thread 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 portion of the mounting plate 13, also serving as the above-mentioned cut groove 14, and the guide groove 15 is cut across the guide groove 15. A protruding 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 a thread take-up spring 21 is attached to the inside of the sewing machine frame, and the tip of the thread take-up spring 21 is adapted to engage the thread passed through the slit. 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.

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 attached to the circumferential surface of the tension plate 27. The thread 22 stretched in the axial direction at the top and passed between the tension discs is connected to the thread take-up spring 2.
6 as well.

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 spring, take-up lever, 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 as in the past. There is no need to raise or lower the thread, and troublesome work such as threading the thread through the hole in the thread take-up becomes unnecessary, making it easier to thread the sewing machine.

Furthermore, if a slit is provided in the sewing machine so that the thread can be threaded through the slit, threading can be done by simply lowering the thread through the slit without having to worry about threading the thread through the thread tension device, thread take-up spring, thread take-up, etc. This makes it easier to thread the sewing machine.

[Brief explanation of drawings]

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 embodiment, and Fig. 5 is a still further embodiment. FIG. 6 shows a partial front view of another embodiment, and FIG. 7 shows a side view of the same embodiment. 1... Sewing machine body, 2... Needle, 3... Slit, 4... Thread take-up spring, 7... Frame plate, 12... Balance, 13... Mounting plate, 14... Cut groove, 16...
Eye hole, 19... Thread guide, 21... Thread take-up spring, 2
2... Thread, 26... Thread take-up spring.

Claims (1)

[Claims] 1. A thread tension device in which a pair of tension discs are arranged on the left and right sides, and when a thread is pulled in one direction, it engages with the thread and bends;
When the thread tension is relaxed, the thread take-up spring moves back to take in the thread, and the upper and lower guides, through which the thread is passed through the cut groove for introducing the thread, reciprocate in the horizontal direction. The thread take-up thread that catches the thread between the guides is passed from above in the order in which the thread is passed through, and the vertical plane passing through the needle and its vicinity passes through the cut groove leading to the guides provided between the tension discs of the thread tension device and on both sides of the thread thread take-up thread. , and is arranged at a position across the thread take-up spring. 2. The sewing machine according to claim 1, wherein the vertical plane further passes through a thread guide. 3. A thread tension device in which slits are formed vertically and in a straight line in a sewing machine frame, and a pair of tension discs are arranged on the left and right sides so as to sandwich the slits;
a thread take-up spring that is arranged across the slit, engages the thread and bends 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 that is connected to the slit. The thread reciprocates laterally between the upper and lower guides through which the thread is passed through the introduction groove,
A thread take-up that captures the thread between both guides in one of the reciprocating strokes is arranged in the order in which the thread is passed from above, and by passing the thread through the slit, the thread can be passed between the tension disks of the thread tension device and to the guide of the thread take-up device. A sewing machine characterized by being able to thread the thread and thread the thread onto the thread take-up spring. 4. The sewing machine according to claim 3, wherein the slit is formed so that a vertical plane passing through the needle or its vicinity passes through. 5. The sewing machine according to claim 4, wherein a thread guide is provided at the slit end.