CS256565B1 - Weft yarn motion sensor - Google Patents

Abstract

The weft nile motion sensor is designed for weft stops on gripper and yarn weaving machines. The moving weft yarn rotates the rotary part of the sensor that carries the pins that interrupt the electromagnetic radiation between the optoelectronic twin. The generated electrical pulses are processed in downstream electrical circuits and, in the absence of them, the weft-stop electronics send a pulse to stop the weaving machine for a weaving error - short or missing weft yarn.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a weft yarn movement sensor for electronic weft stoppers for gripper or needle weaving machines, whereby it senses weft yarn movement and, depending on time or synchronization pulse, measures its weft length.

Known sensors of weft yarn motion on gripper and needle weaving machines utilize three-electric or piezoelectric effects to generate electrical impulses. The generated electrical pulses are processed in successive weft-stop electrical circuits, where they are evaluated depending either on the time or the working position of the weaving machine. In the absence of pulses from the weft yarn sensors, the follower electronics of the weft stop sends an electrical pulse-command to stop the weaving machine for weaving failure - weft yarn clogging in the desired length.

A drawback of these sensors is the high tensile and frictional movement of the moving yarn at the point of contact with the respective timing of the trielectric or piezoelectric generator, which causes them to become more torn in the case of thin and slightly twisted yarns, thereby reducing the performance of the weaving machine. In the case of thin and smooth threads, for example threads of different synthetically produced materials, the generated electrical impulses are small, their processing and evaluation difficult, occasional deterioration of the weft stop occurs.

These drawbacks are eliminated by the weft yarn motion sensor for the electronic weft stopper of gripper or needle weaving machines, the principle of which is that the roll-shaped holder with the groove in which the optoelectronic pair has an axially mounted rubber lining rotating part for rolling the weft the thread, the pin fixed on the rotating part protrudes into the holder groove between the optoelectronic elements. The rotating part of the sensor is wound by weft yarn at 180 ° of its circumference and the yarn movement due to weaving is rotated.

The main advantage of the weft yarn movement sensor of the electronic weft stopper is the reduction in tear, particularly low twisted weft yarns in weaving on pinch and needle weaving machines when the generated pulses are substantially larger and almost independent of thickness, surface smoothness, color and weft shape threads. With a suitable placement on the weaving machine, the sensor can replace the weft guide pulleys. An exemplary solution is shown in the drawing, in which FIG. 1 shows a weft yarn motion sensor in section, FIG. 2 is a top view. FIG. 3 shows a variant of the sensor in FIG. 4 in a top view. The disc-shaped holder 1 with the groove 10, into which the optoelectronic pair 3, 4 opens, has a rotary part 2 with a rubber lining 7 for bearing the weft thread 8 supported by a bearing 6. On the rotary part 2 there is a pin 5 which extends into the groove 10 between the elements of the optoelectronic pair 3, 4. The motion sensor is provided with mounting holes 9.

Moving warp weft yarn δ rotates by rotary part 2 and pin 5 interrupts electromagnetic radiation between optoelectronic pair 3, 4, thereby producing regular electrical impulses as information about weft yarn movement. Imipuls are independent of thread thickness, color and shape. In the case of a weft yarn breakage 8, its movement ceases, causing the electric pulses to disappear from the motion sensor and the weft stopper electronics to send a pulse to stop the weaving machine for an error in the weaving process.

The sensitivity of the weft yarn sensor can be enhanced by increasing the number of pins 5, by increasing the number of optoelectronic pairs 3, 4, or by increasing the number of pins 5 i of the optoelectronic pairs 3, 4.

The weft yarn motion sensor can be used to measure the movement velocity of solid materials, or to measure the length generally after supplementing with appropriate electronics.

The aforementioned solution of the weft yarn motion sensor for the weft stopper of the weaving machine is an example for explaining and understanding the invention. It does not limit the further variations of the invention and the embodiments apparent from the invention.

Claims (1)

OBJECT The weft yarn motion sensor for the electronic weft stopper for pin weaving or needle weaving machines is characterized in that the holder (1j of the disc shape with the groove (10), into which at least one optoelectronic pair (3, 4j) opens with YNALEZA (6j rotating part (2) with rubber lining (7) for rolling the weft yarn (8j, at the same time on the rotating part (2j is at least one pin (5) which engages the groove (10) between the optoelectronic pair elements (3) , 4) 2 sheets of drawings FIG. 9 6. OBR, 4 Severografla, n. P. 7, Most Price 2.40 KCe