JPS5810083A - 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 sewing machine detector, and particularly to a sewing machine detector provided on the upper shaft of the sewing machine.

Sewing machines, especially industrial sewing machines that can perform various sewing controls automatically, use a pulse generator to control the speed, that is, a pulse generator to detect the rotational speed of the upper shaft of the sewing machine, and a pulse generator to detect the rotational speed of the upper shaft of the sewing machine. It is necessary to perform detection such as upper position detection, needle lower position detection, and needle thread trimming timing detection. 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. Furthermore, conventional detectors have the drawback that it is difficult to adjust the detection position and other settings of the detector depending on the type of use.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a sewing machine detector that is small and lightweight, performs a highly accurate detection action, and whose detection position can be easily adjusted. It is in.

To achieve the above object, the present invention provides a coupling fixed to an upper shaft of a sewing machine, a pace supported by the coupling and having one end engaged with a sewing machine main body to be held at a predetermined stationary position, and a coupling. A plurality of photoelectric detection plates each having a light-shielding part that is coaxially stacked and fixed in a removable manner along the axial direction and arranged concentrically at non-overlapping positions, and a plurality of photoelectric detection plates that are fixed to the pace and arranged on both sides of the photoelectric detection plate set. It is characterized in that it includes a light emitter and a light receiver, and any photoelectric detection plate can be replaced.

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 a coupling 10 having one end 10 m fixed to the sewing machine upper shaft (not shown), and a coupling 10 supported by the coupling 10 and one end 12 m engaging the sewing machine main body (not shown). and a pace 12 that is held in a predetermined stationary position. A bearing 14.16 is provided at the joint between the coupling 10 and the four-ring 12, and the four-ring 14.16 allows the coupling 1o to rotate freely within the pace 12.

A collar 18.2o that is divided into two parts in the axial direction of the coupling 10 and is freely 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.

The collar 18 has three photoelectric detection plates 24 and 26.
．． 28 extends in the axial direction of the coupling 10 and is coaxially removably stacked and fixed, and the photoelectric detection plates 24, 26, 28 are
The photoelectric detection plates 24 and 28 on both sides can be slid and rotated by being pressed by the photoelectric detection plate pressing knob 30 whose one end is locked by the collar 20, and the intermediate photoelectric detection plate 26 is pressed by the photoelectric detection plate pressing knob 30, which is locked at one end. is non-rotatably positioned in the collar 18. Therefore, the photoelectric detection plates 24 and 28 are
Each can be rotated separately, and the collar fixing screw 2
By loosening 2 and rotating the collar 18, all photoelectric detection plates 24, 26, 28 can be rotated simultaneously relative to the coupling 1o. Note that the collar 20 locks one end of the photoelectric detection plate pressing knob 30 and also locks the coupling 1.
0 from coming off from the bearings 14 and 16.

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

In Fig. 2.3.4, the photoelectric detection plate 24 is for detecting the lower position of the needle, the photoelectric detection plate 26 is for detecting the rotational speed of the upper shaft of the sewing machine] and for detecting the upper position of the needle.
The photoelectric detection plate 28 is used to detect the thread cutting timing of the needle, and the photoelectric detection plates 24, 26, and 28 are made of a transparent material that transmits light. The photoelectric detection plates 24, 26, and 28 have light shielding portions 24g and 26m formed by printing, for example.
, 26b, and 28m are arranged concentrically at positions that do not overlap, and the light shielding parts 24m, 26a, 26b, and 28a detect the lower position of the needle, detect the rotational speed of the upper shaft of the sewing machine, detect the upper position of the needle, and trim the thread. Timing detection is performed. Further, the photoelectric detection plate 26 in FIG. 3 is provided with a rotation stop 26c, and the photoelectric detection plate 26 is fixed at a predetermined position with respect to the collar 18 by the rotation stop 26c. 2o, the fitting diameter of the photoelectric detection plate 26 disposed in the middle is set so as to frictionally engage with the coupling 1o, and the photoelectric detection plates 24.2 disposed at both ends are
If the fitting diameter of 8 is set so as to fit loosely with the coupling 1o, the photoelectric detection plates 24 and 28 at both ends can be rotated separately, and all the photoelectric detection plates 24 and 28 can be rotated separately without loosening the collar fixing screws 22. Coupling .28 10
can be rotated at the same time.

In addition, in FIG. 1, sensor blocks 32 and 34 are provided on both sides of the photoelectric detection plate set of the photoelectric detection plates 24, 26, and 28, respectively, and the sensor block 32 is fixed to the sensor block 34 by a sensor positioning screw 36. The sensor lock 34 is fixed to the base 12 by a sensor positioning screw 38. The surface of the sensor block 32 facing the photoelectric detection plate is provided with light emitters 40 a, 42 a 144 a, 46 a, and the surface of the sensor block 34 facing the photoelectric detection plate is provided with the light emitters 40 a, 42 a, 44 g, 4
Light receivers 40b, 42b, 44b, at positions corresponding to 6a,
46b is provided (・ru.In addition, the sensor block 3
2, light emitters 40g, 42a, 44a.

A printed circuit board 47a configured with a desired circuit 46a is provided, and the sensor block 34 is provided with a similar printed circuit board 47b.

The present invention includes the aforementioned photoelectric detection plates 24, 26, and 28, and four sets of light emitters 40a, 42, 44a, and 46a.

The desired detection of the sewing machine is performed by the light receivers 40b, 42b, 44b, and 46b.

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 100 rotations of the coupling fixed to the upper shaft of the sewing machine, the photoelectric detection plate 24, 26, 28
rotates, and the light from the light emitters 40a, 42a, 44a, 46m hits the light shielding parts 24a, 2 of the photoelectric detection plates 24, 26, 28.
6a, 26b and 128m, the light is received by the light receivers 40b, 42b, 44b, and 46b, and a desired detection action is performed.

In this embodiment, the photoelectric detection plates 24 and 28 are color 1.
8, the light shielding portions 24a, 28! of the photoelectric detection plates 24, 28 can be rotated separately. I can be adjusted to a predetermined angular position with respect to the coupling 10. Furthermore, although the photoelectric detection plate 26 is fixed to the collar 18 in a non-rotatable manner, the collar 18 can be rotated by loosening the collar fixing screw 22. and simultaneously rotate the photoelectric detection plates 24, 26, and 28, and
, 26m, and 28a can be simultaneously adjusted to predetermined angular positions with respect to the coupling 10. Furthermore, color fixing screw 2
Since the collar 18 can be removed by loosening the collar 2, the photoelectric detection plates 24, 26, and 28 can be replaced depending on the model of the sewing machine or how it is used.
A photoelectric detection plate having a desired light shielding portion 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.

According to the present invention, a photoelectric detection plate made of a thin plate is used instead of the conventional thick ring magnet, so the sewing machine detector can be made thinner in the axial direction, and the emitter and receiver can be arranged concentrically. As explained above, the detector for sewing machines according to the present invention has the advantage that it can be arranged on a plane and has a simple printed circuit board configuration, making the detector inexpensive and compact. Therefore, it is possible to obtain a detector for a sewing machine which performs a highly accurate detection action 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. In each figure, the same members are given the same symbols, 10 is a coupling, 10 is one end of the coupling 10, 12 is a base,
12a is one end of the base 12, 24, 26, 28 is a photoelectric detection plate, 24m is a light shielding part of the photoelectric detection plate 24, 26a, b is a light shielding part of the photoelectric detection plate 26, 28a is a light shielding part of the photoelectric detection plate 28, 40m , 42a. 44m and 46m are light emitters, 40b, 42b, and 44b. 46b is a light receiver. Agent Patent attorney Shin Kuzuno - (1 other person) Figure 1 Il! Figure 3 Figure 4 Procedural amendment (voluntary) April 14, 1980 Mr. Commissioner of the Japan Patent Office, Indication of the case Patent application Sho 1s-toysrl, Title of invention: Detector for sewing machine, Person making the amendment

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 a pace that can be attached and detached coaxially along the axial direction of the coupling. A plurality of photoelectric detection plates each having a light-shielding portion that are freely stacked and fixed and arranged concentrically at non-overlapping positions, and a light emitter and a light receiver fixed to a base and arranged on both sides of the photoelectric detection plate set, respectively. A detector for a sewing machine, characterized in that an arbitrary photoelectric detection plate can be replaced. (2. The detector for a sewing machine according to claim (1), characterized in that at least one of the photoelectric detection plates is provided with two or more light shielding parts.