JPS5810082A - Detector for sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detector for a ζ machine, and particularly to a detector for a sewing machine provided on the upper shaft of the sewing machine.

Sewing machines, especially industrial sewing machines that can automatically perform various sewing controls, use a pulse generator for speed control, that is, a pulse generator for detecting the rotational speed of the upper shaft of the sewing machine. It is necessary to perform detections such as detecting the upper position of the needle, detecting the lower position of the needle, and detecting the thread trimming timing of the needle. Conventionally, a detector consisting of a magnetized ring magnet and a Hall element is usually used for the detection, and the ring magnet is fixed to the upper shaft of the sewing machine.

However, conventional detectors require relatively large ring magnets, especially thick ring magnets, in order to perform reliable detection, and the detectors themselves have the disadvantage of being large in size. High-speed sewing machines had the disadvantage that the rotating parts or magnets could be damaged. Generally speaking, conventional detectors have a drawback in that it is difficult to adjust and change the detection position of the detector depending on the model or usage mode.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a thin detector that is small and lightweight, performs a highly accurate detection action, and whose detection position can be easily adjusted. There is a particular thing.

To achieve the above object, the present invention includes a coupling fixed to an upper shaft of a sewing machine, and a coupling member supported by the coupling and having one end engaged with the sewing machine body so as to be able to slip and rotate coaxially along a predetermined static direction. It includes a plurality of photoelectric detection plates each having a light shielding part that is stacked and fixed and arranged concentrically at non-overlapping positions, and a light emitter and a light receiver that are fixed to a base and respectively arranged on both sides of the charging detection plate set, The photoelectric detection plate is suppressed and fixed in the axial direction of the coupling by a suppressing means, and each photoelectric detection plate can be adjusted to a predetermined angular position with respect to the coupling.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a cross section of a sewing machine detector according to the present invention.

In FIG. 1, the sewing machine detector includes an upper shaft (not shown) of the sewing machine at one end 10! The sewing machine includes a coupling 10 to which a sewing machine is fixed, and a base 12 supported by the coupling 10 and having one end 12a engaged with a sewing machine main body (not shown) to be held at a predetermined stationary position. A bearing 14.16 is provided at the joint between the coupling 10 and the base 12, and the bearing 14.16 allows the coupling 10 to rotate freely within the base 12.

A collar 18.20 that is divided into two parts in the axial direction of the coupling 10 and is slip rotatable is penetrated into the tip peripheral portion 10b of the coupling 10, and the collar 18.20 is tightened and fixed to the coupling 10 by a collar fixing screw 22. be done.

And, color 18 loquat has three photoelectric detection plates 24.26
．． 28 are removably stacked and fixed coaxially along the axial direction of the coupling 10, and the photoelectric detection plates 24, 26, z8 are
The photoelectric detection plate 24 on both sides is pressed by the photoelectric detection plate pressing spring 30 whose one end is locked by the collar 20.
．． Reference numeral 28 is a slip rotatable member, and the intermediate photoelectric detection plate 2
6 is non-rotatably positioned on the collar 18 as will be described later. Therefore, the photoelectric detection plates 24, 28 can be rotated independently, and by loosening the collar fixing screw 22 and rotating the collar 18, all the photoelectric detection plates 24, 26, 2B can be rotated simultaneously relative to the coupling 1o. can. The collar 20 locks one end of the photoelectric detection plate pressing spring 30 and prevents the coupling 10 from coming off the bearing 14, 16.

2, 3, and 4 each show a photoelectric detection plate 24.
．． 26.28 is shown.

In Figure 2.3.4, a photoelectric detection plate 24 is for detecting the lower position of the needle, a photoelectric detection plate 26 is for a pulse generator for detecting the rotational speed of the upper shaft of the sewing machine, and a photoelectric detection plate for detecting the upper position of the needle. Reference numeral 28 is for detecting the thread cutting timing of the needle, and photoelectric detection plates 24, 26, and 28 are made of a transparent material that transmits light. The photoelectric detection plates 24, 26, and 28 each have light shielding portions 24a, 26a formed by printing, for example.
, 26b, 29m are arranged concentrically at non-overlapping positions, and the light shielding parts 241.26a, 26b, 28
The lower position of the needle, the rotational speed of the upper shaft of the sewing machine, the upper position of the needle, and the thread trimming timing are detected by a, respectively. Further, the photoelectric detection plate 26 in FIG. 3 is provided with a rotation stopper 2sc, and the photoelectric detection plate 26
C is fixed in a predetermined position with respect to the collar 18. Note that, without using the collars 18 and 20, the fitting diameter of the photoelectric detection plates 26 disposed in the middle is set so as to frictionally engage with the coupling 10, and the photoelectric detection plates 24. If the fitting diameter of 28 is set so as to loosely fit with the coupling 10, the photoelectric detection plates 24 and 28 at both ends can be rotated separately, and the collar fixing screw 2
All photoelectric detection plates 24, 26, 28 can be rotated simultaneously relative to the coupling 10 without loosening the plates 24, 26, 28.

In addition, in FIG. 1, sensor blocks 3 are provided on both sides of the photoelectric detection plate set of the photoelectric detection plates 24, 26, and 28, respectively.
2.34 is provided, the sensor block 32 is fixed to the sensor block 34 by a sensor positioning screw 36, and the sensor block 34 is provided with a sensor positioning screw,
38 to the base 12, and on the surface of the sensor block 320 towards the photoelectric detection plate, the light emitters 401, 42! , 448, 461 are provided, and on the surface of the sensor block 34 facing the photoelectric detection plate, light receivers 40b, 42b, 44b, 46b are provided at positions corresponding to the light emitters 40a, 42g, 44a, 46a. Note that the sensor block 32 includes a light emitter 40a,
A printed circuit board 47a on which desired circuits 42a, 44a, and 46a are configured is provided, and the sensor block 34
A similar printed circuit board 47b is provided.

The present invention includes the photoelectric detection plates 24, 26, and 28, and four sets of light emitters 40, 42, 44a, 46a, and receivers 40.
b, 42b, 144b, and 46b are used to perform desired detection of the sewing machine.

The sewing machine detector according to the present invention has the above configuration, and its operation will be explained below.

In FIG. 1, the photoelectric detection plates 24, 26, 28 selected according to the model of the sewing machine or the manner of use are connected to the color 18.
laminate and fix. Then, by the rotation of the coupling 10 fixed to the upper shaft of the sewing machine, a photodetector plate 24.
26, 28 rotate, and the light emitters 40a, 42m, 441.
The light from 46a passes through the light shielding parts 24a, 26a, and 26b of the photoelectric detection plates 24, 26, and 28.

Intermittent KlI by 281 and receiver 40b142
b, 44b, and 46b, and a desired detection action is performed.

In this embodiment, the photoelectric detection plates 24 and 28 are color 1.
Since the light shielding portions 24m of the photoelectric detection plates 24 and 28 can be separately rotated with respect to the photoelectric detection plates 24 and 28.

28g can be adjusted to predetermined angular positions with respect to the coupling 10. Further, the photoelectric detection plate 26 has a color 18
However, by loosening the collar fixing screw 22, the force 2-18 can be rotated.
Rotate simultaneously against the photoelectric detection plate 24, 26, 28
The light shielding parts 24, 26a, 26b, 28a can be simultaneously adjusted to predetermined angular positions with respect to the coupling 10.

Furthermore, since the collar 18 can be removed by loosening the collar fixing screw 22, the photoelectric detection plate 24, 26, 28 can be
Therefore, a photoelectric detection plate having a desired light shielding part can be attached to a sewing machine detector.

As described above, according to the present invention, it is possible to obtain a sewing machine detector whose detection position can be easily adjusted.

As described above, according to the sewing machine detector according to the present invention, it is possible to obtain a sewing machine detector that is small and lightweight, performs a highly accurate detection operation, and whose detection position can be easily adjusted.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a sewing machine detector according to the present invention, and FIGS. 2, 3, and 4 are photoelectric detection plates 24, 26, and 2, respectively.
8 is an explanatory diagram of FIG. The same members in each figure are given the same reference numerals, 10 is a coupling, 10a is one end of the coupling 10, 10b is a recess around the tip of the coupling 10, 12 is a base, 121 is one end of the base 12, 18 is a collar , 20 is color, 24.2
6.28 is a photoelectric detection plate, 24m is a light shielding part of the photoelectric detection plate 24, 26 a and b are light shielding parts of the photoelectric detection plate 26, 26C is a rotation stopper of the photoelectric detection plate 26, and 28m is a light shielding part of the photoelectric detection plate 28 , 30 is a photoelectric detection plate pressing spring, 40 a142 a
. 44a, 46a! ! Light emitter, 40 b, 42 b14
4b. 46b is a light receiver. Figure 1 Figure 2 Figure 3 Figure 411! li Procedural amendment (spontaneous) April 14, 1980 To the Commissioner of the Patent Office 1, Indication of the case Patent Application No. 17877-1982 2
, Detector for the name of the invention 3, Representative of the person making the amendment, Kata Yuhito 4, Agent (1) Column for detailed explanation of the invention in the specification (2) Drawing 1 Contents of the amendment (1) The statement "Sensor block 32... is fixed" on page 7, lines 14 to 18 of the specification is corrected as follows. "The sensor block 32 is positioned on the sensor block 34 by the boss 36, the sensor block 34 is positioned on the base 12 by the boss 38, and the sensor blocks 32 and 34 are fixed to the base 12 by fixing screws 48." (2) Figure 1 of the drawings is corrected as shown in the attached sheet. T. 1 or more copies of catalog correction drawings for attached documents

Claims (1)

[Claims] (1) A coupling fixed to the upper shaft of the sewing machine, a pace supported by the coupling and held at a predetermined stationary position with one end engaged with the sewing machine body, and an axial direction of the coupling. A plurality of photoelectric detection plates each having a light-shielding part that is fixed and stacked so as to be able to slip and rotate coaxially along the same axis and are arranged in a concentric circle at non-overlapping positions, and a plurality of photoelectric detection plates that are fixed to a base and arranged on both sides of the photoelectric detection plate set A sewing machine comprising a light emitter and a light receiver, wherein the photoelectric detection plate is pressed and fixed in the axial direction of the coupling by a pressing means, and each photoelectric detection plate can be adjusted to a predetermined angular position with respect to the coupling. detector. (2. In the sewing machine detector described in claim (1), a slip-rotatable collar is provided around the tip of the coupling, and one photoelectric detection plate is provided with a rotation stopper and is fixed to the collar at a predetermined position. Then, by fixing the other charge detection plates to the collar so that they can rotate freely, the other photoelectric detection plates can be rotated separately, and by rotating the collar, all the photoelectric detection plates can be rotated simultaneously with respect to the coupling. Detector for sewing machine characterized by: (3) In the detector for sewing machine according to claim (2), the collar is divided into two in the axial direction of the coupling,
A detector for a sewing machine, characterized in that a spring is used as a means for suppressing a photoelectric detection plate, one end of the spring is locked by a collar, and the collar also serves to fix a bearing.