JPH02145823A - Yarn detector - Google Patents

Abstract

PURPOSE:To detect the breakage of single yarn in high accuracy by adding up the sensing quantities of the shadows of a plurality of single yarns passing through the cross-point of light beams projected to photoelectric sensors and comparing the added value with a standard value. CONSTITUTION:A yarn-detection apparatus 16 is provided with a housing 31 having a U-shaped yarn-transfer path 30, a detecting part having a pair of photoelectric sensors 32, 33 placed in the housing and an arithmetic unit and is placed between a guide member to join single yarns Y1 and Y2 and a delivery roller. The sensing quantity A, B of the shadow of the single yarn Y1, Y2 obtained by the light-receiving part 36, 37 of each photoelectric sensor is added up in the arithmetic unit and the added value is compared with a standard value to detect the occurrence of the breakage of the single yarn.

Description

[Detailed description of the invention]

[Industrial Application Field 1 This invention is based on 411N! The present invention relates to a yarn detection device in a machine, particularly a yarn doubling and winding machine. (Conventional techniquesvIim) In textile machines that double yarn and then wind it, yarn breakage is detected by a detection device installed at each thread path of each single yarn. Therefore, the detection device is only used for single yarns. Problems to be Solved by the Invention] This invention has a method for detecting @ placement in the thread path after doubling. The object of the present invention is to obtain a detection device that can accurately detect the breakage of a single yarn constituting a doubling yarn by providing a detection device. (Means for solving the problem) A pair of photoelectric sensors are arranged in a plane perpendicular to each other, and the light emitted from the light emitting part crosses each other at right angles to reach the light receiving part. The detection unit detects the amount as a sensing amount in the light receiving portion of each photoelectric sensor, and the sensing amount sensed by each of the light receiving portions of the pair of photoelectric sensors is summed, and compared with a reference value, the single yarn being doubled is determined. The light-receiving part of the pair of photoelectric sensors senses the sensing amount obtained by the shadow of the single yarn that makes up the doubling yarn, adds up the sensing amount, and calculates the result. Single yarn breakage is detected by comparing the total value with a reference value.

[Example 1] Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows one of the spinning devices equipped with the yarn detection device of the present invention.
1! 1 is a perspective view showing a drafting device 1 for drafting slivers S1°S2 supplied from a plurality of cans (not shown), and a sliver S1.S2 drafted by the drafting device 1. s2 is heated to form a single yarn Y1. A heating device 2 using an air jet formed on Y2 and a spun single yarn Y
1. It is comprised of a winding unit 3 that joins Y2 and winds it as a doubling yarn Y3. The draft device 1 includes a pair of back rollers 4a, 4b, a pair of middle rollers 5a, 5b, and a pair of front rollers 6a, 6b whose circumferential speeds are set to be faster in order.
The middle roller pair 5a, 5b is equipped with apron belts 7a, 7b. 8a and 8b are slivers S1.8a and 8b supplied from the can. S2 is the back roller pair 4a,
These are sliver guides placed in parallel to feed the sliver to 4b. Further, 9 is a pair of back rollers 4a, 4b and a pair of middle rollers 5.
A sliver separation guide provided between a and 5b,
Sliver S1. inserted in parallel to back roller pair 4a, 4b. Separate S2. Guide blocks io and 1i are provided on the left and right sides of the separation guide 9, respectively.
Column sliver S1. Controls the spread of S2 to the left and right. Therefore, two rows of slivers S1. are separated at this separation guide 9 position. The $2 is drafted while maintaining two parallel rows at the subsequent middle roller pair 5a, 5b position and front roller pair 6a, 6b position, and is introduced into the air injection nozzle 12, 13 of the heating device 2. Heating device 2 is frame 1
An air injection nozzle 12 is installed in a housing 15 fixed to 4.
．． 13 are provided in parallel, each air injection nozzle 12.13 is connected to the supplied sliver S1. S2 is heated independently, and the single yarn Y1. It has the function of forming Y2. The yarn detection device 16 of the present invention is provided between the guide member 17 and the delivery roller 18 for merging the single yarns Y and Y2 obtained in the heating step 2 into a double-plyed state. Reference numeral 19 denotes a separation guide for preventing the confluence point of the single yarns Y and Y2 from floating up and downstream along the yarn path by the guide member 17, and the single yarn Y, which occurs when the confluence point floats to the upstream side. Prevent uneven entanglement between Y and Y. Reference numeral 20 denotes a cutter provided at the position of the guide member 17, and the cutter 20 detects yarn defects from the slab catcher 21 provided in the middle of the yarn path that descends to the winding device 3 via the delivery roller 8. Activated by a detection signal. Reference numerals 22 and 23 are suction ports for dust such as threads, fluff, etc., and 24 and 25 are air suction pipes, respectively. 26 is a single yarn Y1.26 spun from the air injection nozzle 12.13 at the start of spinning or splicing. This is a slack tube that sucks Y2 and prevents the thread from sagging. The winding device 3 includes a bobbin supported by a known cradle arm 27, a friction roller 28 that rotates in contact with the bobbin (or the package), and a traverse guide 29. The yarn detection device 16 of the present invention, as shown in FIG. (not shown). The photoelectric sensors 32 .
The light emitted from the light emitting parts 34, 35 of 33 cross each other orthogonally and reach the light receiving part 36, 37, and the single yarns Y and Y2 running in the yarn running path 30 pass through the intersection of the light emitted. It is arranged like this. The heating device 2 is then drafted by the draft device 1.
The single yarn Y1. When Y2 is doubled by the guide member 17 and reaches the detection section of the yarn detection device 16 of the present invention, the single yarn Y1. Y2 travels within the U-shaped yarn running path 30 and passes through the intersection of the light projections from the light projection section 34.35 of the photoelectric sensor 32.degree. 33 to the light reception section 3f3.37. At this time, the light receiving part 36 of the photoelectric sensor 32 obtains sensing ff1A by the shadows of the passing single yarns Y and Y2,
The light receiving section 37 of the photoelectric sensor 33 similarly receives sensing f.
f1B is obtained, each of the sensing amounts A and B is sent to the calculation unit (not shown) of the thread detection device 16 of the present invention to obtain a total value, and the obtained total value is compared with a reference value to calculate the total value. It detects the presence or absence of yarn breakage in the single yarns that make up the yarn, and when a yarn breakage is detected, it immediately issues a signal to control the operation of textile machines such as yarn doubling and winding machines. [Effects of the Invention] As described in detail above, the yarn detection device of the present invention detects a thread in a plane perpendicular to the thread running path provided in the housing.
A pair of photoelectric sensors are arranged in which the light emitted from the light emitting part crosses each other orthogonally to reach the light receiving part, and a plurality of single threads passing through the intersection of the light emitted by the photoelectric sensors are connected to each other. a detection unit that detects a sensing amount on a light receiving unit; and a calculation unit that adds up the sensing amounts sensed by each of the light receiving units of the pair of photoelectric sensors and compares it with a reference value to detect breakage of a single yarn during doubling. Therefore, no matter what position the single yarn running in the yarn traveling path occupies within the intersection of the light beams of a pair of photoelectric sensors, as long as the single yarn is not cut, the photoelectric sensor Since the total value of the sensing amount obtained by the method shows an almost constant value close to the reference value, by providing the yarn detection HM of the present invention in the yarn path after the yarn has been doubled, the cutting of the single yarns constituting the yarn can be made to a high degree. can be detected with a detection accuracy of .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one spindle of a doubling and winding machine equipped with a yarn detection device of the present invention, and FIG. 2 is a front view of a detection section of yarn detection II of the present invention. Y, Y2...Single thread. 1...Draft device. 3... Winding @ placement. 30... Yarn running path. A, B... Sensing amount. 2... Heating device. 16... Thread detection device. 32, 33... Photoelectric sensor

Claims (1)

[Claims] 1. A pair of photoelectric sensors are arranged in a plane perpendicular to the thread running path provided in the housing, and the light emitted from the light emitting part crosses each other orthogonally to reach the light receiving part. A detection unit that detects the shadows of a plurality of single threads passing through the intersection of the lights as a sensing amount on the light receiving portion of each photoelectric sensor, and a sensing amount that is summed up by the light receiving portions of each of the pair of photoelectric sensors. , and a calculation unit that detects breakage of a single yarn during doubling by comparing it with a reference value.