JPS63160873A - Power source controlling system for printing device - Google Patents

Abstract

PURPOSE:To prevent an operating current from being instantaneously cut off, by providing a power switch detecting circuit and an operation-detecting circuit for detecting the end of a printing operation, and switching OFF a power source when the end of the printing operation is detected while an OFF state of a power switch is being detected. CONSTITUTION:When a power switch is turned OFF, the condition is detected by a switch-detecting circuit 1. Simultaneously, it is monitored at an operation- detecting circuit 4 to find out whether a printing operation at an operating part 2 is finished. When the printing operation is finished, a printing operation end detection signal is supplied to a controlling part 5. The controlling part 5 ANDs the detection signal with a power switch OFF detection signal from the switch detecting circuit 1, upon which a power source in a power source part 3 is switched OFF. However, the detection signal is not outputted from the detecting circuit 4 when the printing operation is being made, so that the AND condition is not established in the controlling part 5, and the power source is not switched OFF.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a power supply control system, and more particularly to a system for turning off an AC (alternating current) Ti source in a printer device.

PRIOR ART Conventional printers are configured so that when the AC power switch is turned off, the lJJ operating power is instantly cut off in response, so it is difficult to turn off the power switch while the printer is in operation. When this happens, the drawing data in the internal memory is instantly erased and is no longer retained. Therefore, if the power switch is accidentally turned off while the printer is operating, the data in the memory will be lost, so when the power is turned on to continue printing, the drawing data will be stored in the internal memory again and then The printing operation is worth hearing. Therefore, there is a drawback that it takes time and efficient printing cannot be achieved.

The purpose of the present invention is to solve the drawbacks of the conventional printers, and its purpose is to prevent errors caused by operational errors or external interference during printer operation. To provide a power supply control method for a printer device, which can print efficiently without immediately stopping the operation of the printer even when the power switch is turned off.

Composition of the Invention A power control system for a printer device according to the present invention includes a power switch detection circuit and an operation detection circuit for detecting that the printing operation of the printer is completed, and the power switch detection circuit detects when the power switch is turned off. The present invention is characterized in that the power is turned off only when the operation detection circuit detects the end of the print operation.

Embodiments Below, embodiments of the present invention will be described with reference to the drawings. - FIG. 1 is a block diagram of an embodiment of the present invention, and a switch detection circuit 1 is a circuit that detects the off state of an on/off switch of an AC power source (not shown). The operation section 2 is a circuit section and a mechanism section that performs a printing operation, and performs the printing operation upon receiving power supply from the power supply section 3.

The operation detection circuit 4 has a function of detecting whether the operation section 2 has finished the printing operation. The control section 5 operates based on the detection output of the operation detection circuit 4 and the detection output of the switch detection circuit 1, and turns off the power of the power supply section 3.

Figure 2 is a flowchart showing the operation of the blocks in Figure 1. If the power switch is turned off due to an operator error or some kind of impact while the printer is operating normally, the switch detection circuit 1 detects this power switch off state (step A). At the same time, the operation detection circuit 4 monitors whether or not the print operation in the operation section 2 has ended (step B), and when the print operation has ended, a detection signal indicating the end of the print operation is supplied to the control section 5 of 111. .

In the control section 5, this print operation completion detection signal is ANDed with the power switch A off detection signal from the switch detection circuit 1, and only then is the power to the power supply section 3 J3 turned off. (Step D).

However, if the printing operation is in progress, no detection signal is output from the operation detection circuit 4, so the AND condition is not satisfied in the control section 5, and therefore the power is not turned off (step C). Only after the printing operation in the operation section 2 is completed, the control section 5 turns off the power to the power supply section 3 (step D).

The end of the print operation may be detected after all data to be printed from the internal memory has been read out and printing has been completed. Furthermore, in the case of a page printer, since a page printing end flag is generated when printing for each page is completed, the generation of this flag may be regarded as the end of the printing operation.

By doing so, even if the power switch is turned off during the printing operation, necessary printing can be continued, thereby improving the efficiency of the printing operation.

As described in detail, according to the present invention, even if the power switch is turned off during a printing operation, the operating power is not cut off immediately, so that the necessary printing operation can be completed. Therefore, there is an effect that efficient printing becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an operation flowchart of the blocks in FIG. Explanation of symbols of main parts 1... Switch detection circuit 4... Operation detection circuit 5... Control section

Claims (1)

[Claims] A power switch detection circuit and an operation detection circuit for detecting the completion of the print operation of the printer are provided, and the operation detection circuit detects the end of the print operation while the power switch detection circuit detects that the power switch is turned off. A power control method for a printer device, characterized in that the power is turned off only when the printer device is turned off.