JPS5851173A - Control of selection of type serial printer - Google Patents

Abstract

PURPOSE:To continue normal printing without misprinting by a methed in which types are restored to their initial positions when the printer cover is closed. CONSTITUTION:When a printer cover is opened for exchanging a ribbon cassette or types, the printing operation of a printer is sropped. After the exchanging operation, when the printer cover is closed, the signal from a printer cover detection element 4 is detected, and a type selection mechanism 2 is driven with a fixed speed by a micro processor 1 for selecting and controlling types. When home signal is detected by a home signal detection circuit 3, the operation of the type selection mechanism 2 is stopped and types are set at the initial positions. Thus, even when types are moved by hand during the exchange of ribbon cassette or types, the printer can continus normal printing work without any misprinting.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a type selection control system for a serial printer Conventionally, in a type selection mechanism that uses a step motor and rotates and moves the type body up and down, the holding force when stopped is weak.
When replacing the ribbon cassette or the typeface, even if the typeface moves due to artificial force and the position of the typeface is shifted as a result, the error cannot be detected, resulting in erroneous printing.

The present invention solves the above-mentioned drawbacks and provides a device that can prevent printing errors by returning the type to its initial position when the printer cover is closed after replacing the ribbon cassette and type. .

In the present invention, type selection is corrected by returning the type to its initial position when the printer cover is closed.

The stop position of the type is stored by the microprocessor, but when the printer cover is opened or closed, the microprocessor moves the type to the initial position and also returns the stored current position to the initial position.

Next, the present invention will be described with reference to the drawings showing embodiments of the present invention.

The embodiment of the present invention shown in the drawings includes a type selection control microprocessor 1, a type selection mechanism 2, a home signal detection circuit 3, and a printer cover opening/closing detection element 4.

When the operator opens the printer cover to change the ribbon cassette or type, the printer stops printing. When the printer cover is closed after replacement, a signal from the printer cover opening/closing detection element 4 is detected, and the type selection control microprocessor 1 starts driving the type selection mechanism 2 at a constant speed, and the home signal detection circuit 3 detects the home signal. When detected, the drive of the type selection mechanism 2 is stopped and the type is set to the initial position.

By using the control method described above, even if the p% operator manually moves the type when replacing the ribbon cassette or the type, the printer can continue printing normally without printing errors.

As described above, the present invention has the effect of correcting type selection by returning the type to the initial position when the printer cover is closed.

[Brief explanation of the drawing]

The drawing is a block diagram of one embodiment of the present invention. l... Microprocessor for controlling type selection, S, 2
. . . Type selection mechanism, 3 . . . Home signal detection circuit, 4 . . . Printer cover opening/closing detection element.

Claims (1)

[Claims] A rotary type body driven by a step motor, means for detecting the initial position of the type body, means for detecting opening/closing of a printer cover, and returning the type body to the initial position when the printer cover is closed. 1. A type selection control method for a serial printer, comprising: means.