JP4052681B2 - Thread tension setting device for edge stitch machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a thread tension setting device for an edge stitch sewing machine.
[0002]
[Prior art]
Conventionally, the edge stitching machine can be wound as an applied stitch in addition to the original edge stitching, but the conventional edge stitching machine has two needles when each of the above stitches is installed. The thread tension device for the left needle thread, the thread tension device for the right needle thread, and the thread tension device for the upper looper thread are hardly adjusted, but the thread tension device for the lower looper thread is used for edge stitching. In contrast to scale 3, it was necessary to adjust the thread tension to 7th place when winding and to make tension more tight than edge stitching when winding. Met.
[0003]
[Problems to be solved by the invention]
According to the present invention, the tension of the thread passing through the thread tension device of the lower looper can be changed by a simple operation when switching between the edge stitching and the winding stitch in the edge stitching machine.
[0004]
[Means for Solving the Problems]
The present invention includes a needle that reciprocates up and down, an upper looper and a lower looper that form a seam in conjunction with the needle, a thread supply source that supplies a thread corresponding to the needle, the upper looper, and the lower looper, An edge provided with a thread tension device that is provided between a thread supply source and the needle, the upper looper, and the lower looper and that adjusts tension to the threads that are respectively supplied to the needle, the upper looper, and the lower looper. In the overlock sewing machine, a looper thread guide plate provided between the thread tension device for applying tension to the thread supplied to the lower looper and the lower looper acts on the thread supplied to the lower looper. A thread tension means that is operable between a first position that does not act and a second position that does not act and applies a predetermined tension to the thread at the first position; The tension state of each thread that can be There is provided operating means for switching the tension state of each thread to a state where sewing can be performed, and operating the thread tension means between a first acting position where the thread tension means acts on the thread and a second position where the thread tension means does not act. The thread guide plate further includes a thread guide part (13, 13) on which slit parts (12, 12) for guiding the thread to the thread tension means are formed, and a thread guide part lower part (14, 14). The problem was solved by using a thread tension setting device in an edge stitch machine characterized by being provided and unitized.
[0005]
[Action]
According to the present invention, in a sewing machine that performs edge stitching, tension is applied to each thread that is provided at an appropriate position on the front wall of the arm machine frame and that is guided to one of the thread holes of the sewing machine needle, the upper looper, and the lower looper. Each of the thread tension devices to be applied and a looper thread guide plate mounted on the arm machine frame are provided, and the looper thread guide plate has one end against a thread tension spring that applies tension to the thread guided to the lower looper. Selection of an edge stitching mode or a winding stitching mode is provided by including a pressing piece to be contacted and a switching element that rotates the pressing piece against the action of the thread tension spring and is provided with an operation portion at one end. The tension of the lower looper thread is changed in conjunction with the operation.
[0006]
【Example】
The structure of an embodiment of the present invention will be described below with reference to the drawings.
The machine frame 1 of the sewing machine is an arm machine frame 2 and a bed machine frame 3, and the bed machine frame is provided with a cover part 4 that can be rotated in the horizontal direction so that the internal mechanism can be inspected by opening the cover part. Has been.
[0007]
A needle bar 6 fitted with a sewing needle 5 at the lower end is provided on the arm machine frame 2 side so as to be movable up and down, and an upper looper that intersects when the sewing needle 5 is lowered in the cover part 4 and A lower looper (both not shown) is swingably provided.
[0008]
On the front wall of the arm machine frame 2, a thread tension device 7 to the left needle that applies tension to the thread guided to the sewing needle 5 from a bobbin mounted behind the arm machine frame and a thread to the right needle A tension device 8 is provided, and further, a thread tension device 9 that applies tension to the yarn guided to the upper looper and a thread tension device 10 that applies tension to the yarn guided to the lower looper are provided.
[0009]
A looper yarn guide plate 11 is further provided on the front surface of the arm machine frame 2, and the looper yarn guide plate has an upper yarn guide portion 13, 13 where slit portions 12, 12 are formed, a lower yarn guide portion 14, The looper yarn guide plate 11 has an L-shaped thread tension plate 15, a pressing piece 20 pivotally attached to the shaft portion, and a switching element 24 connected to the other end of the pressing piece. Is provided and unitized.
[0010]
The thread tension plate has a horizontal portion 16 fixed to the looper thread guide plate 11 by screws 17, 17, and a vertical piece 18 provided with a pressing piece 20 pressed by a thread tension spring 19. The tension spring 19 is supported by a shaft portion 21 fixed to the vertical portion 18 and the other end is brought into contact with a washer 23 that is prevented from moving in the shaft end direction by an E-shaped retaining ring 22 attached to the shaft portion 21. It has been.
[0011]
The pressing piece 20 is bent in a substantially U shape, and one end thereof faces the lower part 14 of the thread guide part, and the lower looper thread T inserted under the thread guide part is connected to the vertical part of the thread tension plate 15. Press to 18.
[0012]
Further, the other end of the pressing piece 20 is provided with an operation unit 25 having a switching element 24 (FIG. 3), and the position indicated by the solid line is rotated to the position indicated by the chain line so that the one end is in a contact state or an open state. The tension is applied to or loosened the thread T.
[0013]
Incidentally, the connecting structure of the switching element integral with the operation portion and the other end of the pressing piece 20 is as shown in FIG. 5, and the operation portion is a dial 25 that is rotatably supported on the looper thread guide plate 11 by the shaft 21. It is included in the embodiment of the present invention that the other end of the pressing piece 20 is rotated by the eccentric cam 27 provided on the shaft portion 26.
[0014]
The present invention has the structure as described above, and since it is unitized, it can be easily attached to and detached from the sewing machine frame. The yarn path is also normal. That is, the thread winding unit passes through each thread tension device, passes through a well-known thread guide unit, is guided to the thread hole of the sewing needle or, in the case of two needles, to the thread hole of the left needle or the right needle, and the thread tension device is After that, it is led to the thread hole of the upper looper. Further, only the yarn guided to the thread hole of the lower looper through the thread tension device is guided to the looper yarn guide plate immediately after passing through the thread tension device.
[0015]
When the yarn guided to the looper yarn guide plate is introduced into the slit portion 12, it is introduced between the vertical plate 18 and the pressing piece 20, so that the yarn is given pressure and has tension due to the position of the operation portion 25. The state can be either relaxed without pressure.
[0016]
In the present invention, since the operation unit 25 is rotated with respect to the thread to the lower looper, it is easy to switch between increasing the tension or maintaining the tension as it is. Tension conversion can be performed quickly.
[0017]
【effect】
Since the present invention has the structure and operation as described above, the tension state of each thread in the state where the edge stitching can be performed in the edge stitching sewing machine having the sewing needle, the upper looper, and the lower looper can be wound. Since it is possible to switch to the tension state of each thread quickly with a device that is extremely easy to operate, it is very convenient not only for home use but also for use in sewing factories, and practically increases production efficiency. The effect is great. The present invention has the structure as described above, and since it is unitized, it can be easily attached to and detached from the machine frame.
[Brief description of the drawings]
The drawings show an embodiment of the present invention, FIG. 1 is a front view of an edge stitch sewing machine equipped with the present invention, FIG. 2 is a front view of the main part of the present invention, and FIG. 3 is a plan view of the main part of the present invention. 4 is a side view of the main part of the present invention, FIG. 5 is a side view showing details of the switching element of the present invention, and FIG. 6 is a plan view showing another embodiment of the present invention.
2 ... arm machine frame 3 ... bed machine frame 5 ... sewing needles 7, 8, 9, 10 ... thread tension device 11 ... looper thread guide plate 14 ... slit thread guide lower 19 ... thread tension spring 20 ... pressing piece 24 ... switching Element 25 ... operation unit

Claims (1)

A needle that reciprocates up and down, an upper looper and a lower looper that form a seam in conjunction with the needle, a thread supply source that supplies a thread corresponding to each of the needle, the upper looper, and the lower looper, and the thread supply source And a thread tension device that is provided between the needle, the upper looper, and the lower looper and adjusts the tension to the threads supplied to the needle, the upper looper, and the lower looper, respectively. In
A looper yarn guide plate provided between the lower looper and a yarn tension device that applies tension to the yarn supplied to the lower looper has a first position that acts on the yarn supplied to the lower looper. Each of the looper thread guide plates in a state in which edge stitching is possible, provided with thread tension means for applying a predetermined tension to the thread at the first position. Operation means for switching the tension state of each thread between the tension state of the thread and the state where the winding can be performed, and causing the thread tension means to operate between a first acting position acting on the thread and a second position not acting on the thread. While providing
The looper yarn guide plate further has a slit portion (12, 12) formed with a slit portion (12, 12) for guiding the yarn to the yarn tension means, and a lower portion of the yarn guide portion (14, 14). A thread tension setting device for an edge stitch sewing machine, characterized in that and are unitized .

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