JPS5918448Y2 - Number display device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a sheet number display device in a copying machine.

Conventionally, the sheet count display devices in copying machines include: ■ Mechanical resettable counters that display only the set number of sheets; ■
One that displays only the number of copies (remaining number) using a mechanical countdown counter; ■The one that displays the set number and the number of copies separately on separate displays; ■The one that displays the number of copies set on a single display during standby. There are devices that display the number of sheets to be copied during copying, but cannot display the number of sheets set during copying, and devices described in (2) above that have a dedicated key for displaying the number of sheets set during copying.

However, with the device (2), it is not possible to know how many copies are being made during the copying process, and with the device (2), it is not possible to determine how many copies are set during a copying period.

In addition, the device (■) requires two displays, which is disadvantageous in terms of cost and space; the device (■) does not allow you to know the number of copies set during the entire copying period; and the device (■) requires a special key, making the panel complicated. It is disadvantageous in terms of additional cost and space.

It is an object of the present invention to provide a sheet count display device that eliminates all of the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention.

The number of copies to be made in the copying machine is input using the numeric keys from O to 9 on the operation panel, and the signals from these numeric keys are sent to gate circuits B1 to B, each consisting of an AND circuit.
Can be added to IO.

Further, the output of the inverter A1 is applied to the AND circuits B1 to BIO, and a copying signal is input to the inverter A1 during copying.

Therefore, except during copying, that is, during standby, signals from the numeric keys are passed through AND circuits B1 to BIO, are coded by the resolution coder DEC, and are set in the set number counter SC.

Also, except during copying, the output of inverter A1 is OR circuit C.
1 to the AND circuit Bll, and the output signal of the set sheet number counter SC passes through the AND circuit Bll, passes through the OR circuit C2, is coded into a 7-segment signal by the segment coder SD, and is applied to the display DP to display the set sheet number. It will be done.

On the other hand, when a print key (not shown) is operated, the copying state is entered, and at this time a copying signal is issued.

During the period when this copying signal is output, the output of inverter A1 is at L level, so the set number signal from the numeric keys is sent to the coder DE by the AND circuits B1 to BIO.
Therefore, the set sheet number counter SC does not change, and the output of the AND circuit Bll becomes L level, and the set sheet number display on the display DP is turned off.

Further, the copy number counter CC counts the number of copies by counting the step signal outputted in conjunction with the copying operation.

The output signal of this copy number counter CC is the AND circuit 8.
13, the copying signal is ANDed with the output of the inverter A2, passed through the AND circuit B13, and then outputted to the OR circuit C.
2, is converted into a 7-segment signal by a segment decoder SD, and is added to a display DP to display the number of copies.

Further, the output of the set number counter SC and the output of the copy number counter CC are matched by a matching circuit AG, and the output signal causes a repeat operation stop circuit ST to operate to stop the repeat operation.

The output signal of the coincidence circuit AG is also ANDed with the output of the inverter A1 by the AND circuit B14, and the output signal passes through the OR circuit C3 and resets the copy number counter CC at the end of the repeat operation.

When the φ key among the numeric keys is operated during copying, the AND circuit B12 is turned on by the signal from the φ key and the copying signal.

The output signal of this AND circuit B12 is applied to the inverter A2, the AND circuit B13 is turned off, and the number of copies displayed on the display DP disappears.

At the same time, the output signal of the AND circuit B12 passes through the OR circuit C1, turns on the AND circuit Bll, and displays the number of sheets set on the display DP.

In this way, AND circuits Bll to B13, OR circuits CI,
A logic circuit consisting of C2, inverter Al, and A2 outputs a set number counter S based on the copying signal and the signal from the φ key.
C. The output signal of the copy number counter CC is switched and sent to the segment decoder SD to cause the display DP to switch and display the set number of copies and the number of copies.

When the clear key is operated, the signal a from the clear key resets the set copy counter SC and also passes through the OR circuit C3 to reset the copy copy counter CC.

As described above, the sheet count display device according to the present invention displays the number of copies and the number of sheets set on a single display, which is advantageous in terms of cost and space, and also displays the number of copies while copying. Since the number of sheets set is displayed during standby, it is natural to know the number of copies per copy while copying, and the number of sheets set while waiting.

Furthermore, since the number of sheets set is displayed while a specific number key is pressed during copying, the number of sheets set can be known even while copying, and a dedicated key is not required, which is advantageous in terms of cost and space.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A plurality of numeric keys for inputting the number of copies to be made, a set number counter for setting the number of copies by signals from the numeric keys, and a copy number for counting the number of copies by counting input step signals. a copying machine having a counter, a gate circuit for blocking a signal from the numeric key to the set number of sheets counter during copying by a copying signal; a display for displaying the number of sheets; The output signal of the set number counter is sent to the display only while the signal from this specific key and the copying signal are being input, and during the standby period when the copying signal is not being input. The number of copies set is displayed, and only when a copying signal is being input and a signal from the specific number key is not being input, the output signal of the copy number counter is sent to the display to display the number of copies. A number display device equipped with a logic circuit.