Automatic control method and system for sheet conveying

Abstract

The invention provides an automatic control method and system for sheet conveying, a detection unit matched with a conveying belt to work is arranged between a feeder part and a gripper edge of a gripper bar, and the detection unit is used for detecting whether a sheet reaches the position or not; the distance between the detection unit and the input end of the conveying belt is a known fixed value; the conveying belt provides power through a servo motor, the actual operation angle of the servo motor is collected from the time when a sheet enters the input end of the conveying belt to the time when a detection unit detects a sheet signal, the angle is converted into longitudinal displacement to serve as a theoretical displacement value, a fixed value is compared with the theoretical displacement value, and a difference value is obtained; and the servo motor is adjusted based on the difference value. According to the automatic control method and system for sheet conveying, the adjusting effect can be achieved without adjusting a mechanical structure, meanwhile, the paper feeding effect of each sheet can be adjusted in real time, the die cutting precision is improved, alarms are reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of sheet conveying, and in particular relates to an automatic control method and system for sheet conveying. Background technique [0002] During the die-cutting process, it is necessary to use the sheet conveying belt to transfer the sheet from the feeder part to the jaws of the main machine part. In the prior art, the timing of the mechanical cam of the feeder part is adjusted to realize the sheet reaching the main machine part. Sooner or later, related technical solutions such as figure 1 As shown, when the timing needs to be adjusted, by adjusting the tension of the tension adjustment structure A1, the tension of the upper and lower chains at the chain A3 is inconsistent, causing the mechanical cam A2 to rotate, thereby adjusting the timing of the feeder part and the main machine part. [0003] But adopt the above method to have the following disadvantages: [0004] 1. The chain for adjusting the timin...

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Problems solved by technology

[0004] 1. The chain for adjusting the timing of the mechanical cam will become slack in a period of time, resulting in a timing offset, which cannot be improved due to space reasons;

[0005] 2. Due to vibration and other reasons, the electrical structure for detecting the timing change of the mechanical cam is easily damaged;

[0006] 3. The frequency of tightening is once every half a month. After more times, there will be no tightening amount. It is necessary to shorten the length of the chain and reciprocate. Now they are all single-row chains, which are unstable. After more times, the chain needs to be replaced. The chain takes a long time, which affects work efficiency;

[0007] 4. It needs to be shut down several times to complete the adjustment according to the experience of the maintenance personnel, which not only depends on the experience of the maintenance personnel, but also affects the work efficiency;

[0008] 5. Using the form of a mechanical cam cannot solve the problem that the position of the sheet is backward or forward due to sheet slipping or printing during the transfer process of the sheet, which will result in a decrease in die-cutting accuracy or an alarm if the sheet is not in place parking situation

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