Yarn-break/yarn-stop detecting device
OwnerShiuji Ohsawainventor
Life of this patent
Estimating the term…
Abstract
In a photoelectric yarn-break/yarn-stop detecting device in which a light emitter element and a photoelectric transducer element are positioned in such a manner that the yarn to travel through the detecting device passes through the beam of light emitted from the light emitter element to the photoelectric transducer element for detecting a break or a stop of the yarn in the absence of noises in the signal current produced by the photoelectric transducer element, the light emitter and photoelectric transducer elements and the path of the light from the light emitter element to the photoelectric transducer element are enclosed within a structure adapted to prevent passage of light and an ingress of dust and flue from the outside of the detecting device.
Claims27
A yarn-break/yarn-stop detecting device having a lateral direction parallel with the direction in which a yarn is to travel through the detecting device and a front-and-rear direction perpendicular to said lateral direction, comprising in combination:
- a casing structure;
- a yarn passage assembly fast on said casing structure and formed with a gap longitudinally extending in a lateral direction of the detecting device, the yarn passage assembly including a transparent portion received in said gap;
- a light emitter element fixedly positioned with respect to said yarn passage assembly and arranged to project a substantially constant beam of light through said transparent portion of the yarn passage assembly in a predetermined front-and-rear direction of the detecting device when the light emitter element is electrically energized,
- a photoelectric transducer element fixedly positioned with respect to said yarn passage assembly and located substantially in alignment with said light emitter element across said transparent portion of the yarn passage assembly in said predetermined front-and-rear direction for being operative to produce an electric current when irradiated with the beam of light emitter element and incident on the transducer element through said transparent portion of the yarn passage assembly,
- output delivery means operative to produce an output signal when actuated electrically, and
- a control circuit electrically intervening between said photoelectric transducer element and said output delivery means for actuating the output delivery means when the current produced by the transducer element is in a predetermined condition,
- wherein:
- said yarn passage assembly comprises first and second bracket members fixedly positioned with respect to said casing structure and spaced apart from each other in a front-and-rear direction of the detecting device for forming said gap therebetween and a dust-proof plug member having a portion constituting said transparent portion of the yarn passage assembly, said transparent portion being closely received in said gap and being detachably in contact with both of said bracket members,
- said transparent portion of said plug member having a generally U-shaped cross section and has front and rear walls which are spaced apart from each other in a front-and-rear direction of the detecting device and which are closely and detachably in contact with said bracket members, respectively.
Dependencies are inferred from the claim text.