Sewing – Elements – Starting or stopping
Patent
1983-03-01
1986-04-29
Nerbun, Peter
Sewing
Elements
Starting or stopping
318467, 250233, D05B 6924
Patent
active
045849544
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a detector for use on a sewing machine, and more particularly to a sewing machine detector mounted on a sewing machine arm shaft.
2. Background Art
There are known sewing machines such as those for industrial use in which various modes of stitching control are automatically effected. It is necessary in such sewing machines that a pulse generator for speed control, that is, a pulse generator for detecting the speed of rotation of an arm shaft of the sewing machine be provided, and detection be made of an upper needle position, a lower needle position, and a timing for cutting off a needle thread. For such detection, there has conventionally been employed a detector comprising a magnetized ring magnet and a Hall-effect element, the ring magnet being secured to the sewing machine arm shaft.
In order to carry out reliable detection, the ring magnet of the prior detector is required to be relatively large in size, particularly thick, and hence the detector per se is of a large size. Due to a large moment of inertia, the detector is disadvantageous in that its rotatable part or magnet tends to be damaged especially when used on high-speed sewing machines which become available in recent years. Another difficulty with the conventional detector is that the detecting position and the like of the detector cannot easily be adjusted or otherwise changed dependent on the type or mode of use of the sewing machine.
DISCLOSURE OF THE INVENTION
The present invention has been made in view of the foregoing prior problems. It is an object of the present invention to provide a detector for use on sewing machines which is small in size, lightweight, capable of detection with high accuracy, and has its detecting position easily adjusted.
To achieve the above object, there is provided according to the present invention a detector for use on a sewing machine, comprising a coupling secured to an arm shaft of the sewing machine, a base supported on the coupling and having one end engaging a body of the sewing machine and held at rest in a given position, a plurality of photoelectric detector plates coaxially removably mounted in axially successive layers on the coupling and having light shields disposed concentrically so as not to be overlapped, and light-emitting and photodetector means fixed to the base and arranged one on each side of the set of photoelectric detector plates, said photoelectric detector plates being pressed axially of the coupling by presser means and each adjustable in a given angular position with respect to the coupling.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a detector for use on a sewing machine according to the present invention;
FIGS. 2, 3 and 4 are side elevational views of photoelectric detector plates, respectively;
FIGS. 5 and 6 are views illustrative of grooves;
and FIGS. 7 and 8 are views illustrative of a presser plate.
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention will be described hereinbelow with reference to the drawings.
FIG. 1 shows in cross section a detector for use on a sewing machine according to the present invention.
As shown in FIG. 1, a sewing machine detector includes a coupling 10 having one end 10a fixed to a sewing machine arm shaft (not shown) and a base 12 supported on the coupling 10 and having one end 12a engaging a sewing machine body (not shown) and held at rest in a given position. There are bearings 14, 16 through which the coupling 10 and the base 12 are interconnected, the coupling 10 being rotatable in the base 12 by the bearings 14, 16.
The coupling 10 has a projecting ring 10c extending in an area in which the coupling 10 and the base 12 are disposed in confronting and close relation to each other. The base 12 has a ring-shaped groove 12b positioned in such an area.
The coupling 10 also has a distal end 10b over which are fitted collars 18, 20 that are separated axially of the coupling 10 and slippingly rotatable, the colla
REFERENCES:
patent: 3683294 (1972-08-01), Gaa
patent: 4072415 (1978-02-01), Inoue et al.
patent: 4183312 (1980-01-01), Angersbach
patent: 4463698 (1984-08-01), Shinozaki et al.
Yamazaki, "Electro-Magnetic Needle Positioner", 6-1977, p. 461.
Nakamura Takashi
Soyama Kazuya
Yamaura Yutaka
Mitsubishi Denki & Kabushiki Kaisha
Nerbun Peter
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