JPS5810080A - 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, which can automatically perform various sewing controls, use a master pulse generator for speed control, that is, a master 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. Furthermore, conventional detectors have a drawback in that it is difficult to adjust and change the detection position of the detector depending on one 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 sewing machine detector that is small and lightweight, performs a high ffIy detection function, and allows easy adjustment of vI4 of the detection position. 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, a base supported by the coupling and having one end engaged with a sewing machine 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 so as to be slip rotatable along the axial direction of the plate and arranged concentrically at non-overlapping positions;
It is characterized in that it includes a light emitter and a light receiver that are fixed to the pace and arranged on both sides of a photoelectric detection plate set, 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 a coupling 10 having one end 10a fixed to the upper shaft of the sewing machine (not shown), and a coupling 10 supported by the coupling 10 and one end 12@- attached to the sewing machine body (not shown). a base 12 that is engaged and held in a predetermined stationary position. A bearing 14.16 is provided at the joint between the coupling 10 and the pace 12, and the bearing 14.16 allows the coupling 10 to rotate freely within the pace 12.

A collar 18.20 which is divided into two parts in the axial direction of the coupling 10 and is freely slip rotatable is penetrated into the peripheral part of the tip of the coupling 10, and the collar 18.20 is fixed by the clamp 22. The ring IOK is tightened and fixed.

The collar 18 has three charging detection plates 24 and 26.
% 28 are removably stacked and fixed coaxially along the axial direction of the coupling 10, and the photoelectric detection plates 24, 26, and 28 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, 2g can be rotated independently, and by loosening the collar fixing screw 22 and rotating the collar 18, all the photoelectric detection plates 24.21i, 2g can be rotated simultaneously with respect to the coupling lO. . Note that the collar 20 locks one end of the photoelectric detection plate pressing spring 30 and prevents the Cassilling lO from coming off from the bearing 14, 16.

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

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. and.

Each of the photoelectric detection plates 24, 26, and 28 has a light shielding portion 24 formed by printing, for example! L, 26a, 261
), 2B& are arranged concentrically at non-overlapping positions, and the cough light parts 241L, 261L, 261), 281LK detect the lower position of the needle, detect the rotational speed of the upper shaft of the sewing machine, and detect the upper position of the needle, respectively. Thread trimming timing is detected.

Further, the photoelectric detection plate 26 in FIG. 3 is provided with a rotation stopper 260.

The rotation stop 260 holds it in place against forces 2-18. In addition, without using color 18.20,
The fitting diameter of the photoelectric detection plate 26 disposed in the middle is set so as to frictionally engage with the coupling IOK, and the fitting diameter of the photoelectric detection plates 24 and 28 disposed at both ends is set to fit the coupling 1.
If set so as to be offset with respect to 0, the photoelectric detection plates 24% 28 at both ends can be rotated separately, and all photoelectric detection plates 24% 28 can be rotated independently without loosening the collar fixing screw 22.
．． 26 and 28 can be rotated simultaneously with respect to the coupling 1o.In addition, in FIG.
2.34 is provided, the sennar block 32 is fixed to the centiblock 34 by the sensor locating screw 36, and the sensor block 34 is fixed to the sennar locating screw 3.
8 to the base 12. One light emitting device 40a, 42a, 441L, 46a is provided on the surface of the centimeter block 32 facing the photoelectric detection plate, and on the surface of the sensor block 34 facing the photoelectric detection plate.

Light receivers 4G'b, 421), 44b are located at positions corresponding to the light emitters 40L, 42a, 44L, 461L.

46b is provided. In addition, Senna block 32
1 light emitters 40a, 421L, 44a.

Printed circuit board 471 on which the desired circuit of 461L is configured
k is provided, and the sensor block 34 is provided with a similar printed circuit board 47b.

The present invention includes the photoelectric detection plates 24, 26, and 28, and four sets of light emitters 40! L, 42a, 44a, 46a, light receiver 4
0 b, 42 b, 441), 461), the desired detection of the sewing machine is performed.

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

In FIG. 1, photoelectric detection plates 24, 26, 28 and color 18 are selected according to the model of the sewing machine or the manner of use.
laminate and fix. The photoelectric detection plate 24, 26, 28 is then rotated by the rotation of the coupling 10 fixed to the upper shaft of the sewing machine.
rotates, and the light emitter 401L.

The light from 421L, 441L, 46a passes through the light shielding parts 241L, 26a, 26b of the photoelectric detection plates 24, 26, 28.
.

The light receiver 40b is intermittently blocked by 281LK.

42m), 44b, and 46b, and the desired detection action is performed.

In this embodiment, the photoelectric detection plates 24 and 28 are color 1.
8, the light blocking portions 24a of the photoelectric detection plates 24 and 28 can be rotated separately.

28a can be adjusted to respective 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 collar 18 can be rotated.
Rotate simultaneously against the photoelectric detection plate 24.26.2s
Light shielding part 24 &, 261L, 261), 281
L can be simultaneously adjusted to a predetermined angular position 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, lightweight, performs a high-level detection function, and allows easy adjustment of the detection position.

[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 the coupling, 10 & is one end of the coupling 10, 12 is the base,
121L is one end of the base 12, 24, 26, 28 is a photoelectric detection plate, 241L is a light shielding part of the photoelectric detection plate 24, 26a,
b is the light shielding part of the photoelectric detection plate 26, 26C is the photoelectric detection plate 26
28a is a light-shielding portion of the photoelectric detection plate 28, 40a is a rotation stopper;
, 42 a, 44 a. 461L is a light emitter, 40 b, 421), 44 b
, 461) is a light receiver. Agent Patent attorney Shin Kuzuno - (1 other person) $2 Figure 3 Figure 4

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 engaging the sewing machine body, and a thread coaxially sliding along the axial direction of the coupling. A plurality of photoelectric detection plates each having a light-shielding portion that are rotatably stacked and fixed and arranged concentrically at non-overlapping positions, and a light emitter and a light receiver that are fixed to the pace and are respectively arranged on both sides of the photoelectric detection plate set. A detector for a sewing machine, characterized in that each charge detection plate can be adjusted to a predetermined angular position with respect to the coupling. (Mai) A detector for a sewing machine according to claim (1), characterized in that at least one photoelectric detection plate is provided with a rotation stopper and is fixed at a predetermined position to a coupling. Claim (In the detector for a sewing machine according to claim 4, the fitting diameter of the photoelectric detection plate disposed in the middle is set so as to frictionally engage with the coupling, and the fitting diameter of the photoelectric detection plates at both ends is set so as to frictionally engage with the coupling. 1. A detector for a sewing machine, which is set so as to be loosely coupled to a coupling, and is characterized in that all photoelectric detection plates can be rotated simultaneously with respect to the coupling, and the photoelectric detection plates at both ends can be rotated separately.