JPS6234539Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a control device for a reverse lever of a sewing machine.

Generally, when sewing with a sewing machine, it is extremely difficult even for experienced workers to match the end positions of the same pattern, such as straight stitches, over a fixed length due to misalignment of the fabric, seam width, etc. That's funny. Therefore, normally, it often happens that the planned end position is exceeded by one stitch or short by one stitch. As a result, the seams become unsightly, especially when the seams are conspicuous, such as stitches or nameplate attachment seams, and this can even affect the value of the product. Furthermore, when backstitching is performed by operating the reverse lever of the sewing machine, a high degree of skill is required to perform backstitching for an appropriate length. That is, no matter how properly the reverse lever is operated, the end position will inevitably shift due to the shift of the fabric and the fixed seam width as described above.

Therefore, the purpose of this invention is to make it possible to selectively operate the reverse lever of the sewing machine so that the sewing end position can easily match the planned position, and it is also possible to easily perform backstitching to the planned length. An object of the present invention is to provide a control device for a reverse lever of a sewing machine.

For this purpose, the control device according to the invention has a stop device for selectively setting the operating position of the reverse lever of the sewing machine, which stop device preferably includes a stop member for setting the reverse lever in a position that reduces the stitch width. , and another stopper member for setting the reverse lever to the sewing direction reversal position.

An embodiment of this invention will be described below with reference to the drawings.

Fig. 1 shows the main body of the device according to this invention, with a fixing member 2 such as a magnet or fixing tape attached to the back side of the mounting board 1, and a hinge 3 attached to one side of the mounting board 1. A rotary support plate 4 is rotatably mounted, and two stopper members 5, 6 (only one of which 5 is shown in FIG. 1) are fixed to the rotary support plate 4. Each stopper member consists of a shaft 5a, 6a and a head 5b, 6b, and the head is configured to be screwed into engagement with the shaft and fixed at an arbitrary height. In this case, if necessary, a fixing nut may be provided for each head.

FIGS. 2 and 3 show an auxiliary lever device that operates together with the stopper device shown in FIG. Figure 4) Reverse lever L
It is rotatably attached by a pivot 10 to a mounting member 9 which is fixed to the tip with a screw or the like. In this case, the lever main body 7 can preferably be configured to rotate above the plane of the reverse lever L but not below. In this way, the lever main body 7 extends from the tip of the reverse lever L in substantially the same plane and forms an extension thereof.

FIG. 4 shows a state in which the thus constructed device according to the invention is mounted on a sewing machine.

As shown in FIG. 4, the stopper device is positioned so as to co-move with the reverse lever L of the sewing machine M, and the auxiliary lever device is attached to the reverse lever L as shown in FIGS. That is, one stopper member 5 of the stopper device is in a position where it co-moves with the lever body 7 of the auxiliary lever device attached to the tip of the reverse lever L, and the other stopper member 6 is in a position where it co-moves with the reverse lever L itself. Positioned. Further, the heads 5b and 6b of each stopper member are moved so that the auxiliary lever comes into contact with the head 5b at the stitch width reducing position and the reverse lever L comes into contact with the head 6b at the sewing direction reversal position by moving the reverse lever L, respectively. The level is adjusted to.

To explain the operation of the device according to this invention, which is attached to a sewing machine in this way, the sewing machine is driven as usual to perform sewing, and when the planned end position on the fabric to be sewn is approached (for example, when the number of stitches is (When the operator has moved a few steps forward), the operator presses down the reverse lever L and the auxiliary lever device together with his fingers to bring the lever body 7 of the auxiliary lever device into contact with the head 5b of one of the stopper members 5. As a result, the width of the seam decreases as the stitch progresses toward the intended end position, and the sewing can be completed accurately at that end position. In this case, if it is necessary to perform backstitching, only the reverse lever L is pushed down further so that it comes into contact with the head 6b of the other stopper member 6, and the backstitching is automatically performed. Further, when the stopper device is not used during the sewing process, the stopper members 5 and 6 can be pushed forward or the device itself can be easily removed.

In this way, by using the device of this invention, it becomes extremely easy to adjust the reverse lever L of the sewing machine, and even experienced workers often have difficulty aligning the stitches accurately to the desired end position or sewing direction change position. Even if you are not a skilled worker, you can very easily and accurately match the seam to the intended end position or direction change position during the sewing process, resulting in a significant improvement not only in product quality but also in productivity. In addition, there are usually quite a few differences in the operability of the reverse lever not only between different models of sewing machines but also between machines of the same model, so it is important to perform necessary and sufficient sewing operations until you become familiar with the sewing machine you are currently using. However, by using the device of this invention, the reverse lever can be operated easily, so there is no need to pay attention to the operation of the reverse lever, and the manufacturing work can be carried out freely.

Moreover, the device according to this invention can be easily installed on any existing sewing machine without machining the sewing machine itself, so its usability is very large.

In the illustrated embodiment, the stopper device is configured to be attached to the base plate of the sewing machine, but it may of course be attached to an appropriate position on the front wall of the sewing machine to which the reverse lever is attached.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the main part of the control device of this invention, Figs. 2 and 3 are side views and perspective views showing an auxiliary lever device in the control device, and Fig. 4 is an embodiment of the invention. FIG. 2 is a perspective view showing a state in which the device according to the example is attached to a sewing machine. In the figure, 1: mounting board, 2: fixing member, 3: hinge, 4: rotation support plate, 5, 6: stopper member,
7: Lever body, 8: Mounting arm, 9: Mounting member, 1
0: Pivot, M: Sewing machine, L: Reverse lever.

Claims (1)

[Scope of utility model registration request] The lever body constituting the auxiliary lever device is attached to the tip of the reverse lever of the sewing machine via a mounting arm extending from one side thereof, so that it extends substantially in the same plane as the reverse lever, and can only be rotated in an upward direction from the plane of the reverse lever. A stopper device is provided at a position below the reverse lever and the lever body, and includes two stopper members that come into contact with the lever body and the reverse lever, respectively, when the lever body and the reverse lever are pressed down. A control device for a reverse lever of a sewing machine, wherein one of the reverse levers sets the reverse lever to a stitch width decreasing position, and the other stopper member sets the reverse lever to a sewing direction reversal position.