JPS5810081A - 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 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 drawbacks such as large size and large moment of inertia. Especially for recent high-speed sewing machines (・
However, there was a drawback that the rotating part or the magnet could be damaged. Additionally, conventional detectors have the disadvantage that there is a risk of threads getting caught in the detector.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a detector for a sewing machine that is small and lightweight, performs a highly accurate detection action, and is capable of preventing thread entanglement. It's about doing.

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 position detection plate fixed to the base, and a detection means fixed to the base and outputting a position detection signal in cooperation with the position detection plate; Alternatively, a protruding ring portion is provided on one side of the base, and a ring-shaped groove portion is provided on the other side of the coupling or the base to prevent the thread from being entangled in the opposing proximal portion.

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 whose one end 10 m is fixed to the sewing machine upper shaft (not shown), and a coupling 10 supported by the coupling 10 and whose one end 12a engages with the sewing machine main body (not shown). and a base 12 that is held in a predetermined stationary position. A culling 14.16 is provided, by means of which the coupling 1o is connected to a 4-seat 12
It can be rotated freely inside.

A collar 18.2o that is divided into two parts in the axial direction of the coupling 10 and can freely slip and rotate is penetrated into the tip peripheral portion 10b of the coupling 1o, 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 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 20 on both sides is pressed by the photoelectric detection plate pressing plate 3o whose one end is locked by the collar 20.
4.28 is slip rotatable, and the intermediate photoelectric detection plate 26 is non-rotatably positioned on the collar 18 as will be described later. Therefore, the photoelectric detection plates 24.2 can be rotated independently, and the collar fixing screws 22.
By loosening and rotating the collar 18, all photoelectric detection plates 24, 26, 28 can be rotated simultaneously relative to the coupling 10. Note that the collar 20 locks one end of the photoelectric detection plate pressing gauge 30 and also locks the coupling 10.
This prevents it from coming off from the 4 ring 14.16.

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

In Figure 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 rotation speed of the upper shaft of the sewing machine, and for detecting the upper position of the needle. The photoelectric detection plate 28 is for detecting the thread cutting timing of the needle.
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 each have a light shielding part 24a formed by printing, for example.
26 a.

26b and 28a are arranged concentrically at non-overlapping positions, and the light shielding parts 24a, 26a, 26b, and 28a provide
Detection of the lower position of the needle, detection of the rotation speed of the upper shaft of the sewing machine,
The upper position of the needle and the thread trimming timing are detected. 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. Note that, without using the collars 18 and 20, the fitting diameter of the photoelectric detection plate 26 disposed in the middle is set so as to frictionally engage with the coupling 10, and the photoelectric detection plates 24. 28
By setting the fitting diameter of the photoelectric detection plates 24.28 so that they fit loosely with respect to the coupling 10, the photoelectric detection plates 24. 26.28e Can be rotated simultaneously with respect to the coupling 10.

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 the sensor positioning screw 36, and the sensor block 34 is fixed to the sensor block 34 by the sensor positioning screw 3.
8 to the base 12. The surface of the sensor block 32 facing the photoelectric detection plate is provided with light emitters 40 a, 42 a, 44 a, and 46 g, and the surface of the sensor block 340 facing the photoelectric detection plate is provided with the light emitters 40 a, 42 a, 44 a, 46
Light receivers 40b, 42b, 44b, at positions corresponding to a.
46b is provided. In addition, the sensor block 32
The light emitter 402.42! , 44a, and 46m are provided, and the sensor block 34 is provided with a similar printed board 47b.

The present invention includes the photoelectric detection plates 24, 26, and 28, and four sets of light emitters 40a, 42a, 44a, 46a1 and a light receiver 40.
b, 42b, 44b, and 46b are used to perform desired detection of the sewing machine.

A characteristic feature of the present invention is that the coupling 10 is provided with a protruding ring portion 10C at the oppositely adjacent portion between the coupling 10 and the pace 12 in FIG.
2 is provided with a ring-shaped groove portion 12b, so that it is possible to prevent the thread from being caught in the opposing adjacent portion. In other words, when the opposing proximal portion is exposed (・), when the sewing thread hangs down near the coupling 10, the hanging end is very easily caught between the coupling 10 and the bearing 16. , accidents such as the stoppage of the upper shaft occur, and when this kind of entanglement occurs, the sewing machine detector must be disassembled to remove the entangled thread, which is an extremely troublesome process. On the other hand, as in this embodiment, by forming a double labyrinth by the ring-shaped groove part 12b and the protruding ring part 10c, the thread cannot pass through the labyrinth. It becomes possible to almost completely prevent the above-mentioned entanglement accident.

According to this embodiment, in order to form the maze,
Since the protruding ring portion 10c is inserted into the ring-shaped groove portion 12b, there is an advantage that even when such a labyrinth is formed, the overall thickness in the axial direction does not increase. Further, the same effect can be obtained by providing a ring-shaped groove in the coupling 10 and a protruding ring part in the pace 12. Furthermore, even in a conventional detector consisting of a ring magnet and a Hall element, similar effects can be obtained by providing a protruding ring part and a ring-shaped groove part in the opposing adjacent parts of the coupling and pace.

The sewing machine detector according to the present invention has the above-mentioned configuration power,
The effect will be explained below.

In Fig. 1, the photoelectric detection plates 24, 26, 2B selected according to the model of the sewing machine or the manner of use are connected to the color 18.
laminate and fix. The photoelectric detection plate 24.26.2B is then rotated by the rotation of the coupling 10 fixed to the upper shaft of the sewing machine.
rotates, and the light emitter 40! , 42m, 44m, and 46m are transmitted to the light shielding part 24a of the photoelectric detection plate 24, 26, 28,
26a, 26b.

Receiver 40b is intermittently blocked by 28a.

The light is received by 42b, 44b, and 46b, and a desired detection action is performed.

In this embodiment, since the photoelectric detection plates 24, 28 and 28 can be individually rotated by one knob with respect to the color 18, the light shielding parts 24a and 28m of the photoelectric detection plates 24, 28 can be set at predetermined angles with respect to the coupling 10, respectively. Can be adjusted to position. In addition, the photoelectric detection plate 26 is positioned and fixed to the collar 18 in a non-rotatable manner. The light blocking portion 2 of the photoelectric detection plate 24, 26, 28 is rotated simultaneously relative to the ring 10.
4a, 26a, 26b, 28a can be simultaneously adjusted to a predetermined angular position relative to the coupling 10.

Furthermore, since the collar 18 can be removed by loosening the collar fixing screw 22, the photoelectric outlet plate 24, 26,
8 can be replaced, and therefore a photoelectric detection plate having a desired light shielding part can be attached to the 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.

Furthermore, in the present invention, in the opposing adjacent portion between the coupling 10 and the pace 12, the coupling 10 is provided with the protruding ring portion 10e, and the 4-ring 12 is provided with the ring-shaped groove portion 12b. , it is possible to prevent the yarn from being entangled in the opposing proximal portion.

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, 1o is the coupling, 10a is one end of the coupling 1o, 10c is the protruding ring portion of the coupling 10, 12 is the pace, 12m is one end of the pace 12, 12b is the pace 12 ring-shaped grooves, 24, 26, and 28 are photoelectric detection plates, 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,
28 is the light shielding part of the photoelectric detection plate 28, 40a, 42a, 4
4g. 46a is a light emitter, 40b, 42b, 44b and 146b are light receivers. Agent: Patent Attorney Makoto Kuzuno - (1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Cabinet Procedures Amendment (Voluntary) RO Showa 5''N - April 14th, Mr. Commissioner of the Japan Patent Office 1, Display Tokugansho ll-11) FIT-
No. 2, Name of the invention Sewing machine detector 3, Person making the amendment Representative Hitoshi Katayama Section (1) Column for detailed explanation of the invention in the specification (2) Figures
Surface 6, Contents of Correction (1) The statement "The sensor block 32 is...fixed" on page 6, line 15 to line 1S of the specification is corrected as follows. "The sensor block 32 is positioned on the sensor block 34 by a boss 36, the sensor block 34 is positioned on the base 12 by a boss 38, and the sensor block 32 and 34 are fixed to the base 12 by a fixing screw 48." (2) ) Figure 1 of the drawing is corrected as shown in the attached sheet. 1. One or more copies of the catalog correction drawings for attached documents

Claims (1)

[Claims] (1) A coupling fixed to the upper shaft of the sewing machine, a base supported by the coupling and having one end engaged with the sewing machine body and held at a predetermined stationary position, and a position detection plate fixed to the coupling; a detection means fixed to the base and outputting a position detection signal in cooperation with the position detection plate, and a protruding ring portion on one of the coupling or the base at a proximal portion where the coupling and the base face each other. 1. A detector for a sewing machine, characterized in that a ring-shaped groove is provided on the other side of the coupling or the base to prevent thread from being entangled in the opposing proximal portion.