RU1774257C - Method of estimating fabric stitchability - Google Patents

Abstract

Usage: in the clothing industry to assess the specificity of materials for stitching by deformation of their thread. SUMMARY OF THE INVENTION On a prepared weld specimen, an area with the maximum fold height is identified, a standard is placed on this horizontal surface, which can be a weld specimen with optimal material deformation by stitching. Then, the distance from points on the surface of the standard and the specimen located on one lines, to a horizontal surface along the stitch line. Based on the results of comparisons of these distances, the degree of deformation of the material is determined by which its ability for stitching 1 s p f-s, 4 il

Description

The invention relates to the clothing industry and can be used to determine the ability of textile materials to stitch when joining parts of sewing products on sewing equipment. The determination of the ability of textile materials to stitch is necessary for their evaluation in the quality control of finished products in sewing enterprises.

A known method for determining the crosslinkability of textile materials. In this method, the assessment of the seam undulation is made depending on the parameters: the distance from the base of the fabric to the top of the wave (b), the thickness of the seamed fabric layer (h) and the stitch length (St). Parameters b and h are determined experimentally on a device based on an optical method for examining a seam. The disadvantage of this method is the measurement of

only two (vertical) characteristics of the welded seam (b and h), since the light beam is directed along the surface of the maximum protrusions of the seam in the direction of the stitch and does not take into account the horizontal characteristics that form the contours of the welded seam in the horizontal plane and are part of the overall st seam soreness

The purpose of the invention is to provide a method for determining the ability of textile materials to stitch, providing an increase in the objectivity and accuracy of research results by simultaneously measuring the characteristics of the samples before and after grinding (instead of the sample of the first variant, a rolled sample can also be used).

The goal is achieved by the fact that on the machined sample prsrrdgt ohm controlS / 1

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The microprocessor reveals the fold area of the maximum height, then two different mechanisms on which the load cells are fixed, simultaneously measure the curved surface of the fabric of the welded seam (the height of the folds at each point of the curve) and the distances from the surface points of the reference sample in the corresponding area located on one line with the surface points of the test sample, to a horizontal surface along the string line. Different-sized signals generated by the strain gauges are amplified and transmitted to the microprocessor, where the values of the above distances are compared with the values of the fold parameters of the sample by subtracting one value from the other. The calculated amount of deformation of the material by a thread line is transmitted to the measuring equipment (display, digital printing device) for registration and determines the ability of the material to staple.

The microprocessor controls the operation of the device, which is carried out according to a specific program: identification of the crease zone of maximum height on the stitched sample; supplying a signal to the movement drive of the device with the probes; measurement of the test surface; transmission of received signals to a digital printing device and display; receiving a return signal from the digital printing device about the end of the operation; turning on the drive of the device with probes to return to its original position; repeating these operations as many times as necessary (at least 5 replicates).

The proposed technical solution contains features that the prototype does not have, namely, simultaneous parallel measurement of the test specimen of the seam and the surface selected for comparison; measurement of both vertical and horizontal characteristics of bends of the welded seam; performing computational and job control functions, e.g., monitoring the pressure of the measuring organ (not more than 0.05 g / cm). The proposed technical solution meets the criteria of the invention - significant differences.

In FIG. 1 device for implementing the method; in FIG. 2 - the same, top view; FIG. 3 is a functional block diagram of a method; in FIG. A - work algorithm,

The method is implemented using an apparatus having a stage 1 with clamps 2 for the test sample 3 of the seam and sample 4 for

comparing. On the table 1, rails are fixed on the racks, on which are mounted with the possibility of movement in mutually perpendicular directions

the carriage 5 with measuring heads 6, one of which is in contact with the test sample 3, and the other in contact with the compared sample 4.

The measuring heads 6 are equipped with probes 7, on the lateral surfaces of which the strain gages are fixed 8. The strain gages are connected to the measuring and control equipment, consisting of an amplifier 9, an analog-to-digital converter 10,

5 microprocessor 11 type KR 580 IR 80 A, communication line 12, display 13, digital printing device 14, storage device 15. A block diagram of the control and measuring equipment is shown in

0 FIG. 3.

A method for determining the crosslinkability of textile materials is as follows. Samples — test and selected for comparison (reference) —are fixed on the instrument table.

According to a predetermined program, the microprocessor turns on the device’s drive, the area of folds of maximum height is identified on the machined (tested) sample, and, taking this area as the initial measurement point, the measuring heads are installed at this point of the machined sample and the corresponding point of the parallel reference sample.

5 The measuring heads move horizontally-translationally simultaneously along two samples. In this case, the curved surface of the seams is measured by the deformation of the probes, reinforce the resultant

0 signal from the strain gauges, they compare the magnitude of the deformation among themselves, transmit the received data to the display and digital printing device. In accordance with the program embedded in the microprocessor, the measurement is repeated several times, but not less than five. The movement of the measuring heads along the studied and compared samples is carried out with the possibility of measuring both vertical50 and horizontal deformation characteristics of the weld of materials.

The method is carried out as follows.

Test sample 3 and sample 4 dl

55 comparisons are placed between the corresponding risks on the table 1 and secured with clamps 2. At the command of the microprocessor 11, the measuring heads 6 of the carriage 5 are installed in the fold area of the maximum height of the sample 3 and the corresponding area

standard 4 so that one measuring head 6 is in contact with an elastic sensor installed on the probe 7 with two-component strain gauge force measuring devices 8 with a curved surface of the fabric of the deformed seam 3, and the other measuring head 6 - only with the surface of the sample 3, at a pressure of no more than O , About g / cm.

After that, at the command of the microprocessor 11, the drive is turned on, and the carriage 5 with the measuring heads 6 begins to move along the guides. The magnitude of the stroke for samples 3 and 4 is 50 cm. In this case, the measuring heads b, moving the probe 7 on the surface of the samples, deform it differently, and with them the strain gauges 8 mounted on them, which generate signals of different sizes which are amplified by an amplifier 9 and transmitted through an analog-to-digital converter 10 to a display 13 and a digital printing device 14, where the deformation value of the test and compared surfaces is read.

Then, the microprocessor 11 receives the feedback signal from the digital printing device 14 about the end of the operation and calculates the deformation value of the above-mentioned surfaces. By comparing both signals, the microprocessor 11 subtracts the other from the one signal, thereby determining the amount of deformation of the seam of the sewing product, which is recorded in the memory of the device 15.

In order to increase accuracy, measurement is performed in five replicates. The operation algorithm is shown in Fig. 4. The operations from stage II to stage IX are repeated 5 times. Next, microprocessor 11 summarizes the five obtained strain values and calculates the average value of this indicator from 5 replicates.

Claims (2)

1. A method for determining the ability of textile materials to stitch, which consists in preparing a seam sample, placing it and fixing it on a horizontal surface and measuring the height of the folds on the sample, distinguishing also that, in order to increase the objectivity and accuracy of the determination results, on the sample, the zone of folds of maximum height, parallel to the weld pattern on a horizontal surface, the standard is displaced, the height of the folds on the sample is measured simultaneously with the measurement of the distance of the outflows of the standard surface in accordance the existing zone, located on a line with points on the surface of the sample, to a horizontal surface along the string line, compare the values of these distances with the height of the folds of the sample and the obtained value of the deformation of the material with a string line the crosslinking ability of the material is determined. 2. The method according to claim 1, characterized in that the measurement of distances from points on the surface of the sample and the reference to the horizontal surface is carried out at a pressure of the measuring organ of not more than 0.05 g / cm2. eleven i Figure 1 8 Phage 2 fig.Z .шШ1 .r-ellma building paypjEbLjK Identification of the crease zone of maximum height on the test sample Test surface measurement Signaling to no. Carriages. values of the investigated. Submission of measurement results to a digital printing device and display j- Reading the amount of deformation of the surface selected for comparison Reception of the signal from the digital printing device about the end of the operation t The calculation of the magnitude of the deformation of the investigated by -. tops Calculation of the average strain from 5 d Measurement of the surface selected for comparison Digital printing knives Reads the amount of surface strain selected for comparison. drove with tsifropeb ending t Calculation of the amount of surface deformation obtained for comparison.