JPS5920685A - Paper feed correction mechanism - Google Patents

Abstract

PURPOSE:To achieve an accurate feeding of a paper by correcting the paper feed speed detecting a plurality of marks preprinted at one end of a printing paper at a fixed interval when printing the paper without sprocket perforations or the like. CONSTITUTION:A printing paper 3 is introduced into an inserter section and stopped temporarily and a mark printing mechanism 1 is lowered to print a plurality of marks 4 at one end of the paper 3 at a fixed interval. Then, the printing paper 3 is inserted into the printing position of a print head 8 to repeat printing and shifting. The markes 4 are detected with a mark detection element 2 and after it is amplified with an amplifier, a signal is transmitted to a control circuit. The control circuit compares the signal with the reference signal and decreases the number of steps in the subsequent shifting when the paper 3 advances too much, while increasing it when the paper 3 is delayed too much. Such a control enables an accurate feeding of a printing paper.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feed correction mechanism used in printers and the like, which detects and corrects paper feed speed.

Conventionally, a paper feed correction mechanism having a friction-type paper feed mechanism such as a printer uses sprocket holes or ruled lines in the print paper to detect the advance or lag of the print paper and correct the speed.

For this reason, there was a problem that paper feed correction could not be performed on paper without sprocket holes or ruled lines.

The object of the present invention is to provide a paper feed correction mechanism that eliminates these defects by feeding the paper while printing marks at regular intervals on the print paper, and that makes it possible to correct the paper feed speed of the print paper. Our goal is to provide the following.

The paper feed correction mechanism of the present invention includes a mark printing mechanism that prints marks at regular intervals on printing paper, a mark detection means that reads the printed marks, and a detection output of the mark detection means that is determined based on the paper feed reference speed. The apparatus includes a control circuit that detects a delay or advance and outputs a control signal to correct the delay or advance, and means for supplying the output of the control circuit to a drive circuit of a paper feeding drive motor.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a side view showing the configuration of a printer inserter section using an embodiment of the present invention. In the figure, E is a mark printing mechanism that prints a mark 4 by vertical movement on a printing paper 3, 2 is a detection element that detects a printed mark, and 5 is a detection element that detects a printed mark.
6 is a control circuit that analyzes the data of the mark reading element 2;
8 is a drive circuit that drives the step motor 7 by the output of the control circuit 5; 8 is a print head that prints on the paper 3;
9 is a paper feed roller connected to the step motor 7 by a drive mechanism; 10 is an amplifier that amplifies the output of the detection element 2 and supplies it to the control circuit 5;

When the printing paper 3 is sucked into the inserter section, the printing paper 3 is temporarily stopped at the stop position indicated by the arrow, and the mark printing mechanism 1 is lowered, as shown in FIG. Print multiple spacing marks. This constant interval is an interval that is an integral multiple of the distance that the printing paper 3 travels by rotating the step motor 7 one step.

Next, the printing paper 3 is inserted at the printing position of the print head 8, and printing and line feed are repeated. On the other hand, the printed mark is detected by the mark detection element 2, amplified by the amplifier 10, and the amplified signal is transmitted to the control circuit 5. Control circuit 5
compares the signal from the amplifier circuit 10 with the reference signal, and if the printing paper 3 is too advanced, the number of steps is reduced with the subsequent line feed, and if the printing paper 3 is too late, the number of steps is reduced with the subsequent line feed. Control is performed to correct the number of steps so as to increase the number of steps.

As described above, the present invention can accurately feed paper in a friction type paper feeding mechanism using printing paper without sprocket holes or ruled lines.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of a printer inserter section using an embodiment of the present invention, FIG. 2 is a plan view of paper on which marks are printed according to the present invention, and FIG. 3 is a block diagram of the embodiment of the present invention. It is a diagram. In the figure, 1...mark printing mechanism, 2...music mark detection element, 3...
・Printing paper, 4...Marks with songs printed on them, 5...
...Control circuit, 6...Drive circuit, 7...
...Step motor, 8...Print head,
9...paper feed roller, 10...music amplifier.

Claims (1)

[Claims] a mark printing mechanism that prints marks at regular intervals on printing paper; a mark detection means that reads the printed marks;
The detection output of this mark detection means detects the delay or advance of the paper feed with respect to the reference speed, and the control circuit outputs a control signal to correct this delay or advance, and the output of this control circuit is connected to the paper feed drive motor. and a means for supplying a drive circuit.