SU1600935A1 - Method of cutting material to length - Google Patents

Abstract

This invention relates to cutting methods for measuring lengths of continuously moving long materials. The purpose of the invention is to improve the quality of products obtained by cutting. In the method of cutting to length using a meter length is carried out tracking position distance L of the axis of the end product cut by the job code shaper is formed on the length L _of the cut article, exhibit an equal point values _of L and L. When these values are equal, a cut command is generated to cut a product of a given length. The defect sensor is installed at a distance L * d from the axis of the cut to meet the movement, L _{d is} chosen within 2L ^min ≤L _d ≤ L ^max , where L ^min is the minimum length of the product

L ^max - the maximum allowable dimensional length of the product. Target length L _zd for cutting an article with a defect formed in a _rear L = L _d + L / 2, after the arrival of the signal "Defect" cut two articles of the same length L _zd. 1 il.

Description

WITH

with

The invention relates to cutting methods for measuring lengths of continuously moving long materials,

The purpose of the invention is to improve the quality of products obtained by cutting.

The drawing is a schematic diagram that cuts to dimensional lengths.

The scheme for implementing the method of cutting to measured length includes a product length counter 1, the first output of the shaper 2 of the length setting code La to cut it is connected to the D input, the first input of the shaper 2 is connected to the subtractive input of the counter 1 and connected to the output of the length sensor 3 (displacements) of the product (sensor 3 in combination with counter 1 is a measure of the length of the product), the second input to the output of sensor 4

defect of the product (transverse seam of the joint of strips, incomplete penetration of the longitudinal seam, etc.), the codes LM - the measured length of the product, respectively, are supplied to the third and fourth inlets of the former 2; constant and / 2.

The fifth input of the imaging unit 2 is connected to the first input of the element OR 5, with the input of the scissors control unit 6 and connected to the output P of the overflow of the counter 1, the second input of the element OR 5 is connected to the second output of the imaging device 2, the output of the element OR 5 is connected to V- the entry of the permission to record information in the counter 1,

The sensor 4 of the defect of the product is installed in front of the scissors at a distance of 1D from the axis of their cutting:

oh oh oh sob

SP

  u 1st

Max

 -D t i-wt

where LM is the minimum allowable dimensional length of the product;

LM is the maximum allowable dimensional length of the product.

The ratio of permissible maximum and minimum dimensional lengths of the product is usually chosen from the inequality

  .

In the general case, the end of the product beyond the cutting axis of the scissors 7 is located at a distance L:

- L - and I lg I M8KS

and S L S LM

and the defect of the product - at a distance of 1sh.

The shaper 2 generates three types of cut length codes for the product to cut: LM is the dimensional length specified on the third input of the shaper 2 when the signal Defect from sensor 4 is missing; Lsfli is the length of the first product after the arrival of the Defect signal; 1bd2 is the length of the second product after the arrival of the signal Defect. And

., max

, min; I 1 max, LM S LM LM

U-HL

1 (2)

At the time of arrival of the signal Defect, the length of the product beyond the cutting axis of the scissors is equal to L, And since the task for cutting the product by the signal Defect should be (2). then for the first item the task will be

, Lfl l

UAI id2 - L - -2

for the second product - the task (2), since at the time of cutting the first product according to the signal Defect L 0 ..

The method of cutting to length measured as follows.

At the moment when the counter 1 goes through zero (after completion of the subtraction from the task Ls recorded from the shaper 2 pulse lengths from the output of the sensor 3), a signal Res appears at the output of P, which passes through the scissors control unit 6 and cuts the specified length La ; having passed through the element OR 5. writes to counter 1 at the input D of the task from driver 2; performs auxiliary operations in the imaging unit 2, first he has folded it. and then writing the 1d / 2 constant into it.

From this constant during the movement of the product (L 0), according to expressions (1) and (2) in the shaper 2, the tasks for cutting the products by the signal Defect are generated.

In the absence of a signal Defect Shaper 2 by the time the signal is issued

0

five

0

25

thirty

35

40

50

The cut counter 1 prepares the task in the form of the length LM. Counter 1 counts the number of LM pulses from length sensor 3 and again issues the Res command. B-6 with this command controls scissors 7. providing a continuous cut of the continuous product to the finished product.

When a signal arrives, the Defect from sensor 4, Shaper 2 issues a reference code (1) to cut off the first product after detecting the defect, Signal Defect, having passed through shaper 2 (for example, after a certain delay and forming as a short pulse), through OR element 5 it records in counter 1 of the task code (1). erasing the accumulated information in it. After this operation, the counter 1 issues the Res command with the length of the product beyond the cutting axis of the scissors 7 equal to (2).

The first Res command after the arrival of a signal. A defect (i.e., by the presence of these two signals) provides the shaper 2 with a reference code (2). which cut the second product.

After cutting off the second product (after the arrival of the Defect signal) by the signal Res. Of the counter 1, the driver 2 again proceeds to form the target codes (1) and Д2 of the product based on the expected next signal Defect, and the LM command is given to the counter 1.

With this cutting, the defect is always oriented towards the end of the second product, and the length of both products is within the measured length, i.e. more minimum and less than the maximum allowable lengths of products.

Claims (1)

Invention Formula The method of cutting material to measuring lengths, including monitoring the distance L of the front end of the material being cut beyond the cutting axis, monitoring possible defects on the material being cut in an area located at a distance of 1x from the cutting axis in the direction of flow in the feed direction, generating the Defect signal and cutting the product with a defect, the formation of a code of a given cut length 1h and the development of the Res command with equality of a given cut length and the distance of the front end of the material being cut from the axis of the cut, characterized in that To improve the quality of products obtained by cutting, the distance of the defect control zone U is chosen from the ratio   1d.1m. where LM is the minimum allowable dimensional length of the product;  - the maximum allowable dimensional length of the product. 5.1600935.6 the length of the UA product with the defect is high and after the arrival of the signal. The defect equals two products with a length equal to U + Lnode 1dz. 1-ed - ",