JPS63312867A - Printer - Google Patents

Abstract

PURPOSE:To enable appropriate paper feed and paper discharge to be performed through operating the same switch, by detecting whether paper is present or absent, feeding the paper to a printable position, deciding whether printing can be performed, and switching a function of external input. CONSTITUTION:With an execution switch 3 depressed, a signal from a paper sensor 2 is read to check whether paper is present or absent. When the level of the signal from the sensor 2 is LOW, it is judged that the paper is present. The record at the time of the preceding paper feeding is checked, and where a new paper is pushed in after discharge of the preceding paper, the paper is fed by about 200 steps by a paper-feeding motor 1, whereby the paper is fed to a printable position. Where paper discharge is not just finished, the paper is fed by a one-line amount. When the level of the signal from the sensor 2 is HIGH, it is judged that the paper is absent, and this condition is stored. The paper feed quantity after the paper is discharged is checked, and when printing can be performed, the paper is fed by a one-line amount. When printing can not be performed, the paper is fed by about 600 steps until the paper is completely discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a printer that feeds paper appropriately depending on the orientation of the paper.

(Prior Art) In conventional printers, the user had to judge the normal single-line paper feed, etc., and the beginning of cut paper and continuous paper, and had to use separate switches to set the number. This complicates the operation and increases costs.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a printer that automatically determines the current surface of paper and changes the function of the same switch in order to solve the above-mentioned problems, and can feed and feed paper appropriately. be.

[Means for solving problems]

FIG. 1 is an explanatory diagram showing the overall configuration of the present invention. The present invention includes a paper feed motor 1, a board detection sensor 2 for detecting the presence or absence of paper, a means A for storing the bark of the paper, a switch 3 for executing the paper feed, and a memory for storing information about the paper. It is constituted by a means A, and a means B for changing the direction of paper feeding (2) executed by the switch 3 from the paper detection sensor 2.

Ru.

〔Example〕

The gist of the present invention will be explained with reference to an embodiment shown in FIG.

In the figure, 1 is a paper feed motor, 3 is a paper feed execution switch (hereinafter referred to as LF switch), 2 is a paper detection sensor that detects the presence or absence of paper, and 4 is a control section.

The paper III sensor 2 is a mechanical sensor, and inputs a low level to the control unit 4 when paper is being produced, and inputs a high level when there is no paper. The LP switch 3 is also a mechanical sensor, and when it is pressed, it is Low level, and when it is not pressed, it is High level.
g h input is made to the control unit.

FIG. 3 is a flowchart showing how the invention operates. To explain with reference to the flowchart, when the LF switch 3 is pressed, the signal from the paper detection sensor 2 is read to check whether there is any paper on the paper.If the level from the senna is low, it is determined that the paper has grown. It also checks the memory of the previous paper feed, and if a new paper is inserted after the previous paper has been ejected, the paper is fed approximately 200 steps to the position where it can be printed. Execute.If not after ejection, execute paper feed for one garment.

If the level from Senna is High, it is determined that there is no paper, and this state is recorded tα. Then, check the paper flow after the paper runs out, and if it is possible to print,
- Execute the paper feed for the clothes. If printing is not possible,
Approximately 600 steps of paper feeding are performed until the paper is completely ejected.

Here, the above operation will be explained in more detail as follows.

First, when the output from the sensor 2 is Low, the previous state of the paper feed sensor stored in the specific area 40 of the memory is checked. Here, the previous value is 1-1 i g k
If it is 1, it can be seen that the paper was attached between the previous time and this time. Also, the previous value was also L.

If it is W, it can be seen that the paper is continuously attached.

Therefore, with this approval, the new paper is Rt? When it is installed, the paper is fed by about 200 steps, for example, and when it is attached continuously, it is fed by one line.

Further, each time the output of the sensor 2 is determined, the determination result is stored in the specific area 41 of the memory. Then, before writing the current portion, the portion that has already been written is shifted to the area 40 for the previous time.

Also, when the level from the sensor 2 is High, it means that there is no paper, but in reality, the position of the center/seat 2 and
Since the position of the print head is shifted, printing can be performed to some extent even if the print head is at High level. Therefore, first Hi
After reaching gh, printing is performed one line at a time each time ``high'' is reached, and the cumulative amount of paper feeding is stored in a specific area 42 of the memory.
The data is stored in the memory, compared with a predetermined value, and printed line by line within the predetermined range. If the specified range is exceeded,
For example, the paper is fed approximately 600 steps to completely eject the paper.

[Efficacy of invention]

According to the present invention, a printer user can perform appropriate paper feeding, paper ejection, and paper feeding by always operating the same switch without considering the state of paper in the printer. . Furthermore, since this can be done with a single switch, the number of switches can be reduced, making it possible to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention. FIG. 2 is a circuit diagram of an embodiment of the present invention. FIG. 3 is a flowchart showing the operation. FIG. 4 is a diagram showing a memory used in the present invention. 1...Paper feed motor 2...Paper detection sensor 3...Paper feed execution switch 4...Control unit A...Paper surface storage means B...Paper feed amount and direction changing means Part 7 After iA

Claims (1)

[Claims] means for detecting the presence or absence of paper; cueing means for feeding loaded paper to a printable position; external input means for executing paper feeding; means for determining whether printing is possible from the paper detection means; 1. A printer comprising means for switching the function of an external input means.