JPS63145064A - Printer paper run-out detection method - Google Patents

Abstract

PURPOSE:To prevent blind hammering action by arranging sensors on both ends of a printing part and permitting printing action of the printing part only when both sensors have detected the existence of paper. CONSTITUTION:If paper P is sent to a printing part 1A side to cover the entire printing part 1A, the light-receiving parts 2B of sensors 2 arranged on both ends of the printing part 1A cannot receive light from corresponding light- emitting parts 2A because of light interruption. Then AND gate 3 accepts this interruption as a logic 1 input, and supplies a signal to such effect that printing is possible to the printing part 1A, interpreting that AND conditions have been satisfied. In response thereto, the printing part 1A commences printing action. If there is any inconvenience on paper P and only light to either of the light- receiving parts 2B is interrupted, AND conditions are not satisfied, and the printing action by the printing part 1A is prevented without fail, and consequently no blind hammering action occurs.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a paper-out detection method for a printer, and in particular, a paper-out detection method for a printer that can reliably detect defects at the edges of paper. % [Prior Art] FIG. 2 is a schematic diagram showing a conventional printer paper out detection method. In FIG. 2, (1) is a printing section, which is a mechanical section for printing required characters and numbers such as alphabets and numbers. (2) is a sensor, which has a suitable light emitting part (2^) and a light receiving part (2B) facing thereto.

The light emitting section (2^) is provided at the opposite end of the printing section (1), and the paper (P) is inserted between the light emitting section (2^) and the light receiving section (2B) opposite thereto. As the paper is fed, its presence is detected, and the printing unit (1) performs a printing operation.

[Problems to be Solved by the Invention] The paper-out detection method of conventional printers has the above-mentioned configuration, and since the paper sensor is provided only on one side of the printing section, the sensor detects the paper-out state. When such a presence is detected, the printing operation is started assuming that the paper has been fed to the entire printing group, resulting in a problem that so-called blank printing may occur.

This invention was made in order to solve the above-mentioned problems, and by arranging sensors at both ends of the printing section, the present invention provides a printer that enables reliable printing without causing dry printing. The purpose of this paper is to obtain a paper-out detection method.

[Means for Solving the Problems] In the paper out detection method of the printer according to the present invention, sensors are arranged at both ends of the printing section, and when both of the two sensors detect the presence of paper, The printing unit is configured to be capable of printing.

Function: According to the present invention, a printing operation can be performed when both sensors disposed at both ends of the printing section detect the presence of paper.

Embodiment FIG. 1 is a schematic diagram showing a paper-out detection method for a printer according to an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 1 are the same or equivalent. In Fig. 1, the two sensors (2) are connected to the printing section (
These sensors (2) are provided at both ends of the sensor (1^).
) Each light receiving part (2B) is an AND gate (3)
The output side of the AND gate (3) is connected to the printing section (1^) side.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be explained. Now, assuming that paper (P) is fed to the printing section (1^) side and covers the entire printing section (1^), the sensors located at both ends of the printing section (1^) (The second light receiving part (2B) is blocked from light from the corresponding light emitting part (2^).Then, the AND gate (3) uses logic 1 to detect that there is such a blocking state. Since the AND condition is satisfied, a signal indicating that printing is possible is supplied to the printing section (1^) side.In response, the printing section (IA) starts the printing operation. Here, if there is a problem with the paper CP) and only the light to one of the light receiving parts (2B) is blocked, the above AND condition will not be satisfied, and this process will start. Therefore, the printing section (IA) is reliably prevented from starting a printing operation.

[Effects of the Invention] As explained above, the paper-out detection method of the printer according to the present invention has a configuration in which sensors are arranged at both ends of the printing section, and both of the two sensors Since the printer is designed to enable the printing operation of the printing unit when the presence of This has the effect of preventing dryness and eliminating the occurrence of dryness.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a paper-out detection method for a printer according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a conventional detection method of this type. In the figure, (1) and (1^) are the printing part, (2) is the sensor, (2^) is the light emitting part, (2B) is the light receiving part, and (3) is the A
ND gate, (P) is printer paper.

Claims (2)

[Claims] (1) Sensors are arranged at both ends of the printing section, and when both of the two sensors detect the presence of paper, the printing section is enabled to perform a printing operation. Out-of-paper detection method for printers. (2) Each of the two sensors is provided with a light emitting section and a light receiving section, both of the light receiving sections are connected to the input side of an AND gate, and the output side of the AND gate is connected to the printing section side. A paper-out detection method for a printer according to claim 1, characterized in that the printer is connected to the paper-out detection method.