JPS6137432Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a sewing machine detector, particularly 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, detect the rotational speed of the upper shaft of the sewing machine, detect the upper position of the needle, detect the lower position of the needle, and detect thread trimming timing. It is necessary to detect the following. Conventionally, for the above-mentioned detection, a detector has been used which usually consists of a magnetized ring magnet and a Hall element, and the ring magnet is fixed to the upper shaft of a sewing machine.

However, this conventional detector requires a relatively large ring magnet, especially a thick ring magnet, in order to perform a reliable detection function, which results in a large detector itself and a large moment of inertia, making it difficult to rotate the rotating part of a high-speed sewing machine. Another drawback was that the magnets were damaged. Furthermore, conventional detectors have the disadvantage that it is difficult to adjust and change the detection position of the detector depending on the model or usage mode.

This invention was made in order to eliminate the drawbacks of the conventional ones mentioned above.The purpose was to create a sewing machine detector that is small and lightweight, has a highly accurate detection action, and can easily adjust the detection position. It is about providing.

In order to achieve the above object, this invention includes a coupling that is fixed to the upper shaft of the sewing machine, and a coupling that is provided so as to surround the coupling, and one end of which is latched to the sewing machine body and held in a predetermined position. a base disposed coaxially along the axial direction of the coupling ring and a rotatable slip member that is divided in the axial direction; and a light transmitting member that is laminated and fixed in a detachable manner in the axial direction of the above member. The present invention is characterized in that it comprises a plurality of light shielding plates having a plurality of sections, and a light emitter/receiver fixed to the base, and each light shielding plate can be adjusted to a predetermined angular position with respect to the coupling ring.

Hereinafter, preferred embodiments of this invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a sewing machine detector according to this invention, and in FIG. 1, the sewing machine detector includes: a coupling 10 whose one end 10a is fixed to an upper shaft (not shown) of the sewing machine; The sewing machine includes a base 12 that is provided to surround the coupling ring 10 and that has one end 12a engaged with a sewing machine main body (not shown) to be held at a predetermined stationary position. A bearing 14 is provided at the joint between the coupling ring 10 and the base 12, and the coupling ring 10 is rotatable within the base 12 by the bearing 14.

Further, the tip peripheral portion 10 of the coupling ring 10
Collars 18 and 20, which are divided into two in the axial direction of the coupling ring 10 and are rotatable as slips, are inserted into b, and the collars 18 and 20 are fitted with a collar fixing screw 22.
It is tightened and fixed to the coupling ring 10 by. The collars 18 and 20 are provided with three light shielding plates 2.
4, 26, and 28 are coaxially stacked and fixed in a detachable manner along the axial direction of the coupling 10, and the pressure spring 3
0, the middle light-shielding plate 26 can slip and rotate, and the light-shielding plates 24 and 28 on both sides are positioned on the collars 18 and 20 so as to stop their rotation in a predetermined state, as will be described later. Therefore,
This intermediate gobo 26 can be rotated separately, and all the gobos can be rotated simultaneously relative to the coupling 10 by loosening the collar fixing screw 22. The collar 20 also prevents the coupling ring 10 from coming off the bearing 14.

The light shielding plates 24, 26, and 28 described above are shown in FIGS. 2, 3, and 4, respectively.

In FIGS. 2, 3, and 4, the left light shielding plate 2
Reference numeral 4 is for detecting the rotation speed of the upper shaft of the sewing machine, a light shielding plate 26 in the middle is for detecting the lower position of the needle, and a light shielding plate 28 on the right side is for detecting the upper position of the needle. These light shielding plates 24, 2
6 and 28 are made of a material that transmits light, and are respectively formed by printing, for example, light shielding parts 24a and 26.
a, 28a are arranged and the light shielding parts 24a, 26a,
28a performs each detection.

In addition, rotation stops 24b and 28b are provided on the left and right light shielding plates in FIGS. 2 and 4, and these left and right light shielding plates 24b and 28 are fixed at predetermined positions relative to the collars 18 and 20 by the rotation stops 24b and 28b. has been done. In addition, in FIG. 1, light shielding plates 24, 26, 2
At the ends of 8 are light emitters and receivers 40, 42, 44, respectively.
are provided, and the light emitters and receivers 40, 42, 44 are connected to printed circuit boards 47a, 47 on which desired circuits are configured.
The printed circuit boards 47a and 47b are fixed to the base 12.

Next, its effect will be explained.

In advance, light shielding plates 24, 26, and 28 selected according to the model of the sewing machine or the manner of use are laminated and fixed on the collars 18, 20. When the light shielding plates 24, 26, 28 are rotated by the rotation of the coupling ring 10 fixed to the upper shaft of the sewing machine, the light from the light emitter and receiver is transmitted to the light shielding portions 24, 26, 28 of the light shielding plates 24, 26, 28.
A, 26a, and 28a provide the desired sensing effect.

Since the intermediate light shielding plate 26 can slip and rotate with respect to the collar 20, the light shielding portion 26 of the intermediate light shielding plate 26
a can be adjusted to a predetermined angular position with respect to the coupling 10. In addition, the left and right light shielding plates 24, 28 are fixed to the collars 18, 20 in a non-rotatable manner, but the collars 18, 20 can be rotated by loosening the collar fixing screws 22.
4, 26, 28 at the same time with respect to the coupling 10, the light shielding portions 2 of the light shielding plates 24, 26, 28
4a, 26a, 28a can be simultaneously adjusted to a predetermined angular position relative to the coupling 10. moreover,
The collar 20 can be removed by loosening the collar fixing screw 22, so the light shielding plates 24, 26,
28 can be replaced, and therefore a light shielding plate having a desired light shielding portion can be attached to the sewing machine detector.

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 highly accurate detection action, and allows easy adjustment of the detection position.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the sewing machine detector according to this invention, and FIGS. 2, 3, and 4 are explanatory views of the left, right, and intermediate portions of the light shielding plate, respectively. In addition, the same parts in each figure are shown with the same reference numerals, 10 is a coupling, 12 is a base,
24, 26, 28 are light shielding plates, 24a, 26a, 2
8a is a light shielding portion of the light shielding plate, and 24b and 28b are rotation stops of the light shielding plate.

Claims (1)

[Claims for Utility Model Registration] (1) A coupling ring that is fixed to the upper shaft of the sewing machine; a base that is provided to surround the coupling ring and that has one end locked to the sewing machine body and held in a predetermined position; A plurality of slip rotatable members disposed coaxially along the axial direction of the coupling and divided in the axial direction, and a light transmitting part that is removably laminated in the axial direction of the member. A detector for a sewing machine, comprising: a light-shielding plate; and a light emitter/receiver fixed to the base, and each light-shielding plate can be adjusted to a predetermined angular position with respect to the coupling ring. (2) The detector for a sewing machine according to claim 1 of the utility model registration claim, characterized in that at least one light-shielding plate is provided with a rotation stopper so that it can be fixed in a predetermined position relative to the coupling ring. Detector. (3) In the detector for a sewing machine according to claim 2 of the utility model registration, the light shielding plate disposed in the middle is frictionally engaged with the coupling ring so as to be rotatable in the rotational direction, and the entire light shielding plate is A detector for a sewing machine, characterized in that the plates are provided so as to be rotatable simultaneously relative to a coupling ring or independently rotatable.