JPS637794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and a manual (or automatic) machine for sewing another cloth or a small piece onto a cloth, etc., and tying and cutting the sewing thread end in a simple manner. It is something.

Conventionally, when attaching name cloth to clothes for this type of purpose, for example at a laundry shop, most of the time it is fastened with so-called staples, but since the fasteners are metal, they can damage the clothes and often It is causing trouble. Therefore, there has been a strong demand for a thread tying machine that can simultaneously tie the end of the thread to prevent the sewn fabric from falling off when sewing with a thread, or that can untie the knot by pulling the end of the thread of the seam and untie the stitching. . It would be extremely convenient to have a stapler-type machine that could perform the above operations simply by squeezing it with your hand, rather than a particularly complicated large machine, so this type of sewing and binding machine has been researched for many years, but it is still difficult to realize it. I didn't see it. There are various reasons for this, but the bottom line is that it is difficult to perform the above-mentioned complex movements using a simple power source such as grip pressure.

The present invention is truly revolutionary in accomplishing this point, and an example of its implementation will be explained with reference to the drawings.

In Fig. 1 and Fig. 2, 1 is a drum-shaped bobbin case 2 which has a rectangular box-shaped base frame and a center shaft 2' at the rear end.
3 is an L-shaped cloth pressing lever whose rear end is pivotally mounted on the thread winding case, and a vertical tail plate 4 has a vertical groove 5, and 3' supports the lever with a spring plate. Reference numeral 6 designates a pivot shaft of a needle drive lever 7 provided on the front end of the lever 3. A pivot shaft 8 is provided on the back surface of the central portion of the lever, and the base of a figure 7-shaped spring plate 9 is pivotally attached to this. The long leg rests on the lever 3, and the short leg is configured to leave a slight gap with the lever 7. A pivot shaft 10 is provided at the rear end of the lever 7, and one end of the connecting rod 11 is connected to the pivot shaft 10. The other end of this connecting rod is connected to the through hole 1 provided at the bottom of the thrust table 12.
The collar 14 is pivotally mounted 14' on a collar 14 that loosely fits on the rear end of the main shaft 13 passing through the shaft 2'. 15 is the main shaft 13
A spring 16 is inserted between the thrust base 12 and the collar 14 at the top, and 16 is a recessed part in the middle of the front flat plate part 17 of the top plate of the base frame 1 that engages with the upper surface of the thrust base 12 as appropriate. 18, and the tail plate 4 of the lever 3 descends into this recess, and since it is also related to the seams of the cloth, the depth etc. are determined depending on the application. Also, in this recessed part, there is a vertical narrow groove 19 (third
) is provided and corresponds to the groove 5 of the tail plate 4. 20
is a collar attached to the tip of the main shaft 13, and a spring 21 is fitted between the collar 20 on the main shaft and the thrust base 12.

Next, in Figs. 1 and 4, 22 is a short shaft pivotally mounted between both side walls at the front part of the base frame 1, 23 is a cam lever attached to the shaft, and 24 is a short shaft attached coaxially. This is a bifurcated thread hooking device, and 25 is a concave notch for thread hooking provided at its tip. Reference numerals 26 and 26' denote both pieces of the frame having a U-shaped cross section, and 26 is a thread cutting blade, which forms scissors together with the base of the thread gripping piece 28 pivotally attached to the upper pivot 27 of the frame.

On the other hand, this thread gripping piece 28 works together with 26' to grip the thread (FIGS. 6, 7, and 8). 28' is a hook. Reference numeral 29 denotes a spring fitted to the pivot shaft 27, which acts to cause the thread gripping piece to normally take a lowered position.

The upper end of a vertical connecting rod 51 engages with the center portion of the thread gripping piece 28 (FIG. 6), and the lower end thereof engages with an appropriate mechanism (for example, a cam) interlocking with the thrust table 12. Immediately before the thrust table completes forward movement, the yarn gripping piece 28 rotates upward against the spring 29 to release the yarn end 45, and the thrust table 21 retreats to return to its original position. Immediately before this, the spring 29 rotates downward, and the hook 28' of the thread gripping piece pulls down the thread 46 connected to the binding part and the needle eye (the newly let out thread part). The thread gripping piece main body, the cutting blade 26, and the frame side piece 26' are configured to engage with each other to cut the right side of the gripped thread and grip the left side. 30 is the bifurcated thread hook 2
4 is attached to the short shaft 22,
The function is such that the bifurcated thread hook is normally kept in a reclined position.

31, 31' are metal stands attached to the frontmost wall of the base frame 1, which hold a vertical shaft 32, to which a connecting bar 32' and a cam 33 are attached below the metal stand 31; A semicircular thread hook 34 is attached above 31', and 34' is its hook.

36 is a long rod provided in the longitudinal direction of the center of the base frame 1 as shown in FIGS. 1 and 4, and a long groove 3 is provided at the rear end.
6' and a pin 35 on the arm provided horizontally on the collar 14 which loosely fits in the groove at the rear of the transverse shaft.
are internally engaged, and the pivot 35' at the tip of the long rod
A connecting arm 32' is fitted into the connecting arm 32'.

Reference numeral 37 denotes a spring fitted to the vertical shaft 32, which keeps the semicircular thread hooking device 34 in the position shown in FIG. 38 is a sewing needle whose handle is the thrust base 12
It is fitted and secured 38' into a hole provided in the upper part of the holder.
A bobbin 39 is housed in the bobbin case 2, and the thread (or string) 40 wound on this bobbin is pulled out through a thread guide hole 39' provided in the bobbin case and passed through the eyelet 41 from the upper surface of the needle. It is configured so that it extends downward,
A notch 42 is provided on the lower surface of the needle slightly behind the target position.

This application has the above-mentioned structure, and its operation will be explained. The following describes the case where a small piece of cloth K is sewn onto a wide cloth C. In Fig. 5, needle 3
The thread end 40 of the thread passed through the 8th hole 41 extends forward in the figure, but this can be done by pulling out the thread at first, just like the beginning of sewing on a normal sewing machine. 2
From the second time onwards, the thread end is gripped by a thread gripping mechanism mainly consisting of a thread gripping piece 28 (FIGS. 7 to 10).
Now, the operation of this device starts when the needle drive lever 7 is squeezed. That is, when the device in the state shown in FIG.
is pressed, the collar 43 fixed to the main shaft 13 is pushed forward to move the main shaft 13 forward, and the cam lever 23 is pushed through the collar 20 at the tip of the main shaft to raise the bifurcated thread hooking tool 24 coaxial with the cam lever 23. When the thread hooking tool is erected, the thread 40 extending from the needle eye 41 is hooked onto the concave notch 25 as shown in FIGS. 8 to 11, and takes the position shown in FIG. 10.

In this state, as you can see in the figure, the thread terminal 4
5 is held by the thread gripping piece 28, and since the center portion of the thread is held by the bifurcated thread hooking device, the thread forms a kind of loop shape as a whole, and this is referred to as loop A. Next, the presser foot lever 3 begins its downward movement via the spring plate 9 pivotally attached to the back surface of the lever 7.

As you can see from the structure of the spring plate, this starts after a moment's delay. When the cloth presser plate 3 descends, the tail plate 4 at its front end lowers, and the cloth C placed on the upper surface of the base frame is lowered.
and the cloth piece K to be sewn thereon are both pushed into the recessed part 18 of the flat plate 17 (FIG. 12).

When the main shaft 13 moves further forward, the collar 43 pushes the thrust stand 12 and advances the needle 38 fixed to the upper part of the thrust stand.
As a result, the cloths C and K pushed into the recessed part 18 in a U-shape are penetrated. Grooves 5 and 19 are provided in the tail plate 4 and the recessed portion 18 so as not to obstruct the course of the needle.
The needle advances further, passes directly under the thread hooked on the bifurcated thread hooking lever 24, reaches the position shown in FIGS. 13 and 14, and stops. At this time, the thread that comes out of the needle eye 41 and reaches the bifurcated thread hanger 24 forms a thread loop B.

On the other hand, before the needle stops, the pin 35 engaged in the rear long groove 36' of the long rod 36 begins to push the right end 44 of the long groove. That is, the length of the long groove 36' is determined so that the long rod 36 is started after a necessary time lag.
Now, as the long rod 36 moves forward, the connecting arm 32' pivotally attached to the tip thereof rotates, the vertical shaft 32 of the thread tying mechanism rotates, and the semicircular thread hooking tool 34 at the upper end of the thread tying mechanism is rotated. Rotate.

The movement of the semicircular thread hook 34 plays a major role in the yarn end tying operation, and the hook 34 is located on the opposite side of the needle in FIGS. 13 to 15, and its rotation The movement causes the hook 34' to move the needle 38
Inside the concave notch 42 on the rear lower surface of the eye, that is, the thread 40
(Fig. 14), and further passes in front of the bifurcated thread hooking device to enter the thread loop B (Fig. 16).
Rotate further, and the bifurcated thread hook and thread gripping piece 28
The thread advances to a position directly below and beyond the end portion 40' between the ends of the thread. As shown in FIG. 14B, the hook 34' has a structure formed upward at the tip of a semicircular body, so that when it is retracted (described next), it hooks the thread and the hooked state. The hook can be gripped by the cam 33 when passing under the needle and passing through the thread ring B.
to avoid collision with the needle. Lever 7
The above actions are achieved by squeezing the .

Now, next, by releasing the grip pressure on the lever 7, each mechanism will attempt to return to its original position due to the repulsive force of each spring, and at that time, the binding and cutting of the thread ends will be completed. Since each mechanism operates in the order described above, first the semicircular thread hook 34 returns to its original position, but at this time, the hook 34' is attached to the thread end 40' as shown in FIGS. 16 and 17. Hook the thread through the thread ring B, and then pull out the recessed part 42 at the front of the needle.
, and as shown in Figures 17 and 18, thread tail 40'
bring out. Next, as shown in FIG. 18, the thread end passes through the thread ring M left behind by the needle, so as the needle continues to retreat, the thread ring M is pulled to the left and becomes smaller. As a result, the thread knot is pulled and tied between the hook 34' and the eyelet.

At this time, the thread gripping piece 28 of the thread gripping and cutting mechanism is activated, hooking the middle part of the needle eye and the knot of the thread with its hook 28', and pulling it downward, so that the side of the thread part connected to the knot is hooked with its hook 28' and pulled down. is cut with the cutting blade 26, and the end of the thread on the side connected to the needle eye is gripped with the frame side piece 26'. At about the same time, the bifurcated thread hook and the cloth presser lever return to their original positions, and the cloths C and K, which had been pressed in a U-shape, are also released.

Now, when the free cloth is stretched flat from the U-shape, there are two
It can be seen that a single thread is inserted through the back side (Figure 21) of the book, and the end of the thread passes through the cloth K to form a knot with the thread that emerges from the bottom side.

When viewed from the side, it looks like Figure 22. However, in this figure, the knots are shown loose to show the entanglement of the threads.

As mentioned above, the present invention is excellent in that the sewing of the cloth and the binding of the thread ends can be completely performed in a simple operation and in a short time by squeezing the lever 7 and then releasing it. .

Now, one of the modifications of the present invention will be described. The one shown in Fig. 23 has two recessed parts in the flat plate part 17 of the base frame 1, and two corresponding tail plates of the cloth presser lever. Become. Of course, it is not that difficult to create multiple finer eyes than that.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the internal structure of the device of the present invention;
Fig. 2 is a front view, Fig. 3 is a plan view, Fig. 4 is a plan view showing the structure, Fig. 5 shows the state in which the thread is inserted into the needle, and Figs. 6 and 7 are the thread gripping and cutting mechanism. , 8th~
Fig. 12 is a bifurcated thread hooking device, Figs. 13 to 19 are thread end binding mechanisms, Figs. 20 to 22 are explanatory diagrams showing the sewing state of cloth, and Fig. 23 is an illustration of a second stitch sewing device. It is a side view with some parts omitted. Symbol explanation, 1... Base frame, 2... Thread winding case,
2'... Center shaft, 3... Presser foot lever, 4... Tail plate,
5... Vertical groove, 6... Pivot, 7... Needle drive lever, 8... Pivot, 9... Spring plate, 10... Pivot,
11... Connecting rod, 12... Thrust stand, 12'...
...Through hole, 13...Main shaft, 14...Collar, 14'
... Pivot shaft on collar, 15 ... Spring, 1
6... Top plate, 17... Flat plate part, 18... Recessed part,
19... Groove, 20... Collar, 21... Spring, 22... Short shaft, 23... Cam lever, 24...
... Bifurcated thread hook, 25 ... Concave cutout, 26 ... Thread cutting blade, 26' ... Frame side piece, 27 ... Pivot, 28
...Thread gripping piece, 28'...Hook, 29...Spring, 30...Spring, 31, 31'...
Metal base, 32...Vertical axis, 32'...Connection arm, 33...Cam mountain, 34...Thread hook (semicircular), 34'...Hook, 35, 35'...Pivot,
36... Long rod, 36'... Long groove, 37... Spring, 38... Needle, 39... Bobbin, 39'...
Thread guide hole, 40... Thread (string), 40'... Thread end, 4
1...Meadow, 42...Concave part of needle, 43...Collar, 44...Right end of long groove, 45...Thread end, A...
...loop, B...thread ring, C...cloth, K...piece of cloth, M...thread ring.

Claims (1)

[Scope of Claims] 1. A spool storage case is provided at one end, and a top plate of an elongated box-shaped base frame having a grooved recessed portion on the upper surface of the other end is provided with a spool shaft of the spool storage case as a supporting axis. a cloth presser plate that extends to the other side and whose lower surface is supported by a leaf spring; a needle drive lever that has a fulcrum on the top surface of the tip of the cloth presser plate and extends in the opposite direction and is supported by a leaf spring; and a driving section consisting of a connecting rod, one end of which is pivotally connected to the lower surface of the tip of the needle drive lever, and the other end of which engages with the rear part of the main shaft 13, and performs forward and backward movement in conjunction with the connecting rod. A main shaft, a bifurcated thread hook that interlocks with the main shaft via a cam lever that engages with the front end of the main shaft, and a two-pronged thread hook that is fixed to the upper position of a thrust stand attached to the main shaft and operates later than the bifurcated thread hook. a sewing needle mechanism having a long groove at the rear thereof, a pin provided at the rear part of the main shaft engages with the long groove, and engages and interlocks with the tip of a long rod that interlocks with the main shaft with a certain time lag, A cloth sewing and binding device comprising a semicircular thread hook mechanism that rotates in the horizontal direction and has a hook at the tip. 2. The cloth sewing and binding device according to claim 1, which has a cloth presser lever having a plurality of concave portions and a plurality of tail plates corresponding to the concave portions on the upper surface of the base frame.