JPH03131294A - Position transducer of sewing machine needle - Google Patents

Abstract

PURPOSE:To enable stopping at the optimum constant position by continuously widening the width of a detecting plate by adjustment without exchanging a detector especially through enabling to change the width of the detecting plate freely and continuously. CONSTITUTION:Detecting plates 1a, 2a differing in width are provided at both ends of an apparatus and mounting holes are made as slots so that the detecting plates respectively form a two-plate constitution and are fixed to a rotor by a screw 8. When a lower positioning section or upper positioning section is desired to lengthen according to a sewing machine used, the screw 8 is loosened and when the lower position detecting plate 1a or upper position detecting plate 2a fans out, the screw 8 is tightened again. Then the width of the detecting plate widens continuously and the lower or upper positioning section can be made longer. Also, the screw 8 is loosened, the lower position detecting plate 1a or upper position detecting plate 2a is turned by 180 deg. and set so that the other end of the detecting plate is used, and the screw 8 is tightened again. Then the width of the detecting plate can be widened further. Thus, the width of the position detecting plate can be changed continuously and a needle can be stopped at the constant position in a special sewing machine, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a needle position detector for sewing machines, and is particularly used to control the needle position of sewing machines with large inertia, heavy load sewing machines that use thick cloth or thick needles. Regarding position detectors.

[Conventional technology]

In the conventional device, as described in the Hitachi Electromytes I Tsubu Service Manual, the position detection plate has one width, and has one width for the detection plate of ].

Each was composed of 11 pieces.

[Problem to be solved by the invention]

In order for the above-mentioned conventional technology to stop a sewing machine with a large load such as a sewing machine with a large inertia or a sewing machine using a large needle for thick material sewing at a fixed position,
It is necessary to widen the upper position and lower position sections, and this point is not taken into consideration for the above-mentioned special sewing machine.
There was a problem in that the detection plate had to be replaced with a wider detection plate with wider upper and lower position sections.

SUMMARY OF THE INVENTION An object of the present invention is to enable a special sewing machine to continuously widen the width of a detection plate through adjustment without replacing the detector, thereby enabling the machine to stop at an optimal fixed position.

[Means to solve the problem]

The above object is to provide a wide shape at the other ends of the upper position and lower position detection plates so that both ends can accommodate position detection elements, and
For detection plates that are not used, make the mounting holes oblong so that they are located in positions that are not related to the position detection element.

By stacking two sheets and opening them in a fan shape, the width of the detection plate can be freely and continuously varied, allowing special sewing machines to stop at a fixed position simply by adjusting the detection plate without converting to a special detection plate. .

[Effect]

The detection plate has two detection plates with different widths on both ends, the mounting holes are elongated holes, and two stacked detection plates can be selected from two different widths at the time of installation. By opening them in a fan shape,
From the point of view of the function of the detection plate, the width of the detection plate becomes wider continuously.
As a result, the upper position and lower position sections become larger,
This allows special sewing machines etc. to be stopped at a fixed position.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

1a is a lower position detection plate of the present invention, and 2a is an upper position detection plate of the present invention, which are fixed to the rotor with screws 8. When tightening the screw 8, the detection plate is set at an appropriate angle by selecting an appropriate width. 3 is a position detection magnet, 4 is an upper position detection element, and 5 is a lower position detection element, which are fixed to a printed board 9, and the printed board 9 is fixed to the main body of the position detection device. Reference numeral 6 denotes a speed generator magnet, which is fixed to the rotor. 7 is a speed generator coil fixed to the main body.

The rotor is fixed to a sewing machine pulley (not shown) or the like, and rotates in synchronization with the rotation of the sewing machine.

Therefore, the lower position detection plate 1a and the upper position detection plate 2a are rotated by the rotation of the rotor. The lower position detection plate 1a passes between the 3 position detection magnet and the 5 lower position detection element, and the 2a upper position detection plate passes between the 3 position detection magnet and the 4 upper position detection element. , respectively, to detect the lower position section and the upper position section 5. The other end of each detection plate, which is not used, has an elongated detection plate mounting hole, so
It does not reach each position detection magnet and is irrelevant to detection.

If you want to lengthen the lower position section or upper position section depending on the sewing machine used at this time, loosen the screw 8, open the lower position detection plate 1a or the upper position detection plate 2a in a fan shape, and then tighten the screw 8 again. The width becomes wider continuously, and the lower or upper position section can be made longer. If you want to make the width even wider, loosen the screw 8 and use the lower position detection plate 1a or the lower position detection plate 2a.
The width of the detection plate can be further increased by turning the upper position detection plate 1800 times and setting it so that the other end is used, and then tightening the screw 8 again.

FIG. 7 shows a conventional device, in which 1 is a lower position detection plate 2 and an upper position detection plate, each of which has only one type of width.

Therefore, both the lower position section and the upper position section are fixed to one type. Other components are the same as the embodiments of the present invention.

According to this embodiment, the width of the lower or upper position detection plate can be changed continuously by sharing parts other than the detection plate, and the lower or upper position section can be changed.

〔Effect of the invention〕

According to the present invention, since the width of the position detection plate is continuously variable, the lower or upper position section is continuously variable, and by lengthening the section, it is possible to stop the needle at a fixed position on special sewing machines etc. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a diagram showing a lower position detection plate of an embodiment of the present invention, and FIG. Figure 5 is a state diagram of the lower position detection plate according to an embodiment of the present invention when the width is at its maximum on the narrow side, and Fig. 5 is a state where the lower position detection plate according to the embodiment of the present invention is at the maximum amount on the wide side. 6 is a diagram showing the lower position detection plate of the conventional product, FIG. 7 is a longitudinal sectional view of the conventional product, and FIG. 8 is a right side view of FIG. 7. 1.1a...Lower position detection plate, 2,2a...Upper position detection plate, 3...Position detection magnet, 4...Upper position detection element, 5...Lower position detection element, 6. ...Speed power generation magnet, 7...Speed power generation coil, 8...Screw, 9
・・Pudding 7 b) Fist/shi d + Hayame first Haya■ Diagram 弔巳! / Mr. Kuchi

Claims (1)

[Claims] 1. For sewing machines, consisting of a lower position detection plate corresponding to the lower position of the sewing machine needle, an upper position detection plate corresponding to the upper position of the sewing machine needle, a position detection magnet for detecting the detection plate, and upper and lower position detection elements. In the needle position detector, the above-mentioned upper position detection plate and lower position detection plate are each provided with shapes of different widths at the other end, and have a structure that can be attached as two stacked plates to correspond to the position detection element. , A sewing machine needle position detector characterized in that its width is continuously variable in view of its performance as a position detection plate.