JPS62134283A - Printer paper position correcting method - Google Patents

Abstract

PURPOSE:To keep the setting state of paper always proper, by a method wherein photo sensors are provided near both edges of the paper feeding drum of a printer, the bending of paper or the like are quickly grasped by detecting the state of printer paper to control the rotation of paper feeding motor. CONSTITUTION:Each two photo sensors are provided vertically laterally on both edges of printer paper 1 and the state of paper is monitored. The number of paper feeding motors M1, M2 is right and left two. The same operation is carried out in ordinary paper feed time and independent operations are carried out in correcting the position of printer paper 1. When blank lines continue, in order to carry out the operation for correction of the position of paper, the output from the photo sensors 2 is read to detect the state of paper 1. The rotation of the motors M1, M2 is determined according to the state of paper 1 and the operations of rotary direction, rotary amount, etc., are indicated to the motors. The paper is always kept horizontal by the correcting motions of the motors M1, M2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printer paper position correction method for ensuring that printer paper is fed at the correct position when paper is fed in a printer.

(Prior Art) Conventionally, when feeding paper without guide holes at both ends (thermal transfer, etc.), the key to feeding the paper straight has been how horizontally the paper is fed.

For this reason, a slight misalignment when the paper is initially inserted increases as the paper is fed over a long period of time, and there is a possibility that the paper may end up being caught in the printer.

(Means for Solving the Problems) In order to compensate for this drawback, the present invention provides an optical sensor near the edge of the paper feed drum of the printer to detect the condition of the printer paper and to prevent the paper from bending. By quickly capturing the information and controlling the rotation of the paper feed motor, the paper is always kept properly set.

(Operation) FIG. 1 is a diagram showing the flow of a procedure for correcting the paper position in an embodiment of the present invention.

This procedure will be explained below.

When blank lines continue, the output from the optical sensor is read to detect the state of the paper in order to correct the paper position.

The rotation of the motor is determined depending on the condition of the paper, and instructions are given to the motor, such as the direction of rotation and amount of rotation.

This corrective movement of the motor keeps the sheet level at all times.

(Embodiment) FIG. 2 is a diagram showing an overview of a printer paper feeding device in an embodiment of the present invention.

Here, 1 is printer paper, 2 is an optical sensor, 3 is a paper feed roller, and M1 and M2 are motors, and the positional relationship thereof is shown.

FIG. 3 shows a cross section of the optical sensor section, in which two optical sensors 2 are provided at both ends of the printer paper 1, at the top, bottom, left and right, to monitor the state of the paper.

FIG. 4 shows a paper feed motor section in an embodiment of the present invention. Here, there are two paper feed motors Ml and M2 on the left and right.
The same operation is performed during normal paper feeding, and an independent operation is performed when correcting the position of the printer paper 1.

Figure 5 shows various cases of the positional relationship between the printer paper and the optical sensor.
Give an example.

Here, * of the optical sensor 2 indicates OFF, and O indicates ON.

It is also assumed that the motor M1 is on the right side and the motor M2 is on the left side.

Examples of motor operation for each case are shown in the table.

(Effects of the Invention) As is clear from the above embodiments, the present invention has the advantage of always maintaining the proper position of the printer paper.

Therefore, it is possible to prevent the paper from being twisted or rolled up, which tends to occur in conventional printers, and it is possible to eliminate the waste of paper and time caused by such operations.

4. Brief description of the drawings - Figure 1 is a diagram showing the flow of a paper position correction procedure in an embodiment of the present invention, Figure 2 is a diagram showing an overview of a printer paper feeding device in an embodiment of the present invention, FIG. 3 is a sectional view of the optical sensor section, FIG. 4 is a paper feed motor section in an embodiment of the present invention, and FIG. 5 is a diagram showing various cases of the positional relationship between printer paper and the optical sensor.

1...Printer paper, 2...Light sensor.

3... Paper feed roller, Ml, M2... Motor.

Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A paper feed roller driven by a motor and optical sensors are provided at both ends of the printer paper transported by the paper feed roller, the position of the printer paper is monitored by the optical sensor, and the paper feed motor A printer paper position correction method characterized in that an abnormality in paper position in a paper feeding state is corrected by controlling the paper position.