JPH0248980A - Power supply control system for printer - Google Patents

Abstract

PURPOSE:To prevent a power supply from being turned OFF during printing by inhibiting a power supply turning-OFF instruction signal from a host device while there is a signal indicating that printing is being conducted which signal is generated after reception of printing data from the host device until the end of a printing operation. CONSTITUTION:With printing data 11 transmitted from a host device 1 to a printer device 2, the device 2 prints according to the data. A signal 14 indicating that printing is being conducted is brought to a high level. After it is confirmed that the signal attains a low level upon completion of printing, the host device 1 varies a signal 15 from high to low in level, thereby stopping an output from a power supply controller 13 to a power supply 6 for the printer device 2. When the signal 15 is at the high level, the controller 3 outputs the power supply 6 to the printer device 2, in a low-level power-OFF condition.

Description

[Detailed description of the invention] 1 hill missing The present invention relates to a power control system for a printer.

In a data processing system that uses a method in which the power of a printer is remotely controlled by a host device, if the host device issues a power-off instruction while printing, the printer's power will be turned off even though printing is in progress. There is a drawback that it becomes

An object of the present invention is to provide a power control system for a printer that prevents the power from being turned off during printing.

The power control method for a printer according to the present invention includes means for generating a signal indicating that printing is in progress after receiving print data from a host device until the end of mechanical printing operation, and The system is characterized in that the power-off instruction signal from the host device is suppressed during the existence period of the signal.

K belly The present invention will be described in detail below using the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 0, a host device 1 sends print data 1 to a printer device 2.
1, and also checks whether the printer device 2 is printing using the signal 14, and sends the printer device 2
The power supply is remotely controlled by signal 15.

Signal 12 is a signal indicating the remaining amount of paper in printer device 2, and signal 13 is a signal indicating whether printer device 2 is in an alarm state. The host device 1 transmits the print data 11 to the printer device 2 while checking these signals 12 and 13.

The power supply controller 3 controls the power supply 6 of the printer device 2 according to the state of the signal 15.

FIG. 2 is a time chart showing the above operation. When print data 11 is sent from host device 1 to printer device 2, printer device 2 prints according to print data 11. The print raw signal 14 is at a high level during printing, and becomes a low level when printing is completed. Print raw signal 1
After confirming that 4 has become low level, host device 1
changes the signal 15 from high level to low level, and stops outputting the power supply 6 from the power supply controller 3 to the printer device 2.

When the signal 15 is at a high level, the power supply controller 3
A power supply 6 is output to the printer device 2, and the power is turned off at a low level. In FIG. 2, 21 indicates data reception start timing, 22 indicates printing end timing (mechanical printing end), and 23 indicates printing operation in progress.

As explained above, according to the present invention, by adding a signal indicating that printing is in progress to the printer's interface signal, the signal indicating that printing is in progress can be added to the printer's interface signal in a system in which the power supply of the printer is controlled from a host device. Checking this has the effect that the power will not be turned off during printing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a time chart showing the operation of the blocks in FIG. Explanation of symbols of main parts 1... Host device 2... Printer device 3... Power controller

Claims (1)

[Claims] (1) A means is provided to generate a signal indicating that printing is in progress after receiving print data from the host device until the mechanical printing operation is completed, and during the period when the signal exists, the host device issues a power-off instruction. A printer power control method characterized by suppressing a signal.