JPH0611446B2 - Method for improving the accuracy of constant-size cutting - Google Patents

Description

Description: [Industrial field of use] The present invention relates to an apparatus for performing a sizing process for cutting long sheets into a predetermined size, and the sheets having a predetermined size and undergoing a required process. The present invention relates to a method for improving the accuracy of sizing cut for the purpose of accurately matching the length of the slab with a preset length.

[Prior Art] For example, in an apparatus system that appropriately cuts roll-shaped long sheets with a slitter and cuts to a required length,
Sheets of a required size are fed into the mechanism in synchronization with the time when the cutting mechanism such as the rotary cutter functions. Various means have been disclosed and are actually used for aligning the time when this cutting mechanism works with the arrival of the cutting point for obtaining a fixed size, but there are roughly two measures. Is well known.

The first is to maintain the feeding cycle of long sheets by attaching a controllable dancer roll or detecting patterns on long sheets while maintaining a constant cutting period by operating the cutting mechanism at a constant speed. The other is to control the cutting speed of long sheets while maintaining a constant feeding speed to the cutting mechanism of long sheets, and detects the minute difference of this feeding with a major roll. It controls the operation timing.

By adopting each of these means, the arrival of the fed sheets at the processing point at the predetermined processing target point and the expression of the processing function such as the cutting mechanism at this processing point are matched. From an operational point of view, it is difficult to find a perfect match due to slippage due to the material of the long sheets or control failure due to inertia of the moving parts of the processing mechanism.
An error of about ± 0.3 mm was unavoidable in the 0 mm length slicing work.

[Object of the Invention] In view of the present situation, the present invention is to accurately match the operating point of the cutter processing mechanism and the required sheet feeding length when performing the sizing process on long sheets. It was made as a proposal not to propose a method for significantly improving the accuracy of the sizing process. Specifically, in the above processing system equipment, a major roll installed on the pass line of the sheets fed to the processing mechanism. In addition to the measurement by the measuring roll, the measuring roll of the passage length is attached to the feed roll on the side of the cutting mechanism rather than the measuring roll, and the specified length measured by these measuring rolls and the measuring roll are detected. By operating the processing mechanism only when the predetermined length is matched with the predetermined length, it is intended to improve the accuracy in the constant-size cutting in which the predetermined size is preset.

[Structure of the Invention] One embodiment of the present invention will be described below. When the rotary cutter 4 is used as the cutting means, the constant-size cutting device 1 for cutting long sheets to a constant size has a rearward position based on the sheet advancing direction of the rotary cutter 4 as shown in FIG. A major roll 2 and a feed roll 3 are sequentially provided facing a pass line 7 into which long sheets 6 are fed, and a conveyor 5 for transporting cut products to the next process is provided below the rotary cutter 4, In most cases, the amount of passage of the long sheets 6 in 2 is measured by a pulse from a rotary encoder attached to the major roll 2.

In this way, the amount of passage of the long sheets 6 is measured by the measure roll 2, and at the same time, the rotation speed of the rotary cutter 4 is controlled based on the measurement, so that the sheets corresponding to the preset length are fed. Rotary cutter 4 every time
Is operated to disconnect.

In such cutting, the regulation of the required length depends only on the measurement by the major roll 2, but in the method of the present invention, the measuring roll by the major roll 2 is provided and the long sheet is also provided on the feed roll 3. The passing amount measuring function of the class 6 is additionally provided, and the rotary cutter 4 is not operated when the measured amount by the major roll 2 and the measured value by the feed roll 3 do not match.

As will be further described, in the major roll, the feeding size of the long sheets is measured by a pulse of a rotary encoder attached to the major roll, which is generally used. An encoder is attached to the rotary cutter including the servo mechanism, and the rotation speed of the rotary cutter is controlled by signals from both encoders.

On the other hand, the output from the encoder of the major roll is D. C. Guided by the motor, the measured value on the feed roll is checked and measured, and the rotary cutter is activated only when the measured value and the measured value on the major roll completely match.

Further, as another specific example, in the processing system device such as the above example, a decoder is attached to the rotary cutter, and a signal of the measurement value of the major roll and a signal of the detection value of the feed roll are input, and both signals are matched. If you set it so that the rotary cutter works only for a limited time,
It is also possible to make an error in the cutting length with respect to the required length hardly occur.

[Effect of the Invention] According to the method of the present invention, the processing length measured by the major roll is measured by another measuring function unit attached to the feed roll before being fed to the processing mechanism such as the rotary cutter. Since it will be measured repeatedly, due to slip etc. due to the material of long sheets, if the measurement with the major roll does not match the measurement with the feed roll (measurement function part),
Since the rotary cutter does not operate, cutting (processing operation) with an error is not performed, and the rotary cutter operates when the processing length measured by the major roll and the processing length measured by the feed roll match. Because I did
It is possible to eliminate the malfunction that tends to occur in the conventional means.

[Brief description of drawings]

FIG. 1 is a diagram showing a sizing processing apparatus as an example to which the method of the present invention is applied. DESCRIPTION OF SYMBOLS 1 ... Sizing device, 2 ... Major roll 3, Feed roll, 4 ... Rotary cutter 5 ... Conveyor, 6 ... Long sheet, 7 ... Pass line.

Claims (1)

[Claims] 1. A measure length of a long sheet traveling in front of a feed roll for feeding a long sheet is measured by a major roll, and a feed length of the long sheet is also measured by the feed roll and measured by the major roll. When the measured value on the feed roll and the measured value on the feed roll match, the sizing / cutting means is activated.When the measured value on the major roll and the measured value on the feed roll do not match, the sizing cut is performed. A method for improving the accuracy of constant-size cutting by stopping the operation of the means.