JPS60238854A - Alarm buzzer driving circuit of electronic copying machine - Google Patents

Abstract

PURPOSE:To decrease the number of parts of a circuit, and to reduce the cost price by using commonly one of frequency dividing circuits which divided a reference clock into various frequencies and operating each part, to a buzzer outputting circuit of an alarm, too. CONSTITUTION:A CPU22 of a main control substrate 2 divides a quartz resonator 21 by frequency-dividing circuits 30, 31 and drives motors 3, 5 through driving parts 4, 6. Also, by a program of a memory 28; a data is sent and received to and from a key 11 of a console 1 and a display part 22 through a programmable peripheral (PPL)25 and an interface 29. When a toner run-ou, a paper jam, form run-out, etc. are generated in the course of a copy processing, the PPI25 provides an output to a gate 26, turns on the gate 26 together with an output of the frequency-dividing circuit 31, and raises an alarm 13 through a transistor 27. In such a way, the circuit is simplified, and the cost price is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm buzzer drive circuit for an electronic copying machine in which the structure of the alarm buzzer drive section is simplified.

[Conventional technology]

As an example of a conventional alarm buzzer drive circuit for an electronic copying machine, there is one shown in FIG.
It is provided with an LED display 12 that displays the number of copies, failure diagnosis display, etc. in 7 segments, and a DC power supply vC.
A piezoelectric buzzer 13 which generates various alarms with continuous sounds (or intermittent sounds) when supplied with C, and a piezoelectric buzzer 13 which is mounted on the main control board 2 and controls all copying control, and also provides a clock signal as a reference clock for the entire system. OPU generated using crystal oscillator 21
22 and the clock signal (2 MHz w 5 MHz) output from the clock terminal TD of the OPU 22 at an optimal frequency (for example, 80 MHz) for driving the piezoelectric buzzer 13.
Frequency divider circuit 2 that gradually decreases the frequency from 0Hz to i, 000Hz)
3 and 0PU22 ic 7'-p /< bus, address bus, and control bus 24, and transmits and receives signals with the console 1 and outputs the driving finger alloy to the piezoelectric buzzer 13. peripheral interface) 25,
A gate 26 that takes the AND of the drive command from the PPI 2 S and the output signal of the frequency dividing circuit 23, and a transistor 27 that drives the piezoelectric buzzer 13 connected as a load based on the signal output from the gate 26. It consists of

Note that the OPU 22 includes a ROM in which a program is stored and a RAM in which data is stored via a pass line 24.
A memory 28 comprising 'i is connected. Furthermore, the %PPI 25 includes an interface 29 for receiving information from the key 11 via the input port FA and the output port PB and for driving the LBD display 12.
is connected. On the other hand, there is a branch circuit 30 for supplying a pulse signal corresponding to the reference speed of the motor 3 to the drive unit 4 for driving the carriage motor 4 for driving the carriage of the copying machine. and the main motor 5'f of the copying machine! : A frequency dividing circuit 31 for supplying a pulse signal corresponding to the reference speed of the motor 5 is connected to the drive unit 6 for driving.

The drive units 4 and 6 operate the servo so that the deviation between the reference pulse corresponding to the required rotational speed supplied from the 1-frequency dividing circuit and the pulse generator (PG) that generates a pulse signal according to the rotational speed of the motor becomes zero. Along with a configuration for controlling the amplifier.

Its on/off is managed by a control signal output from the interface 29J:t).

In the above configuration, when the power of the copying machine is turned off, power is supplied to the main control board 2 and the electrical systems of each part. OP
U 22 generates a high frequency continuous wave based on the resonance frequency of the crystal oscillator 21, and this oscillation frequency or a frequency-divided signal is output to the TD terminal. The clock signal at the TD terminal is frequency-divided to a desired frequency by 5-divider circuits 23, 30 and 31, respectively, and supplied to gate 26 and drive units 4 and 6, respectively. Place the original on the platen and press the start button after setting the number of copies and other settings using the keys 11 and 0PU22) According to the program in i-memory 28,
Controls the electric drive system in addition to the carry motor 3 and main motor 5, and starts printing. As the number of copies to be printed progresses, the CPU 22 performs a complete down-count process based on an output signal from a sensor (not shown), and subtracts the value displayed on the LBD display 12 every time the countdown is performed.

During the copy process, an event occurs that requires a strong warning to the operator (for example, paper jam, out of toner, copy condition setting error, paper end, etc.), and it corresponds to the warning generation condition of the predetermined program. When, 0PU2
2 outputs a command signal to the gate 26 via the PPI 25. Since the output signal of the frequency dividing circuit 23 is constantly applied to the gate 26, the output signal of the gate 26 is applied at the same time as the command signal is generated.
generates an output signal and transistor 27 is turned on. As a result, the transistor drives the piezoelectric buzzer 13 using the output frequency of the frequency dividing circuit 23, and the piezoelectric buzzer 13 emits a continuous sound of a constant frequency. The driving time in this case is uniquely determined by the sending time of the command signal output from the PPI 25, and this time can be set in advance in the ROM.

[Problem that the invention seeks to solve]

However, the conventional number buzzer drive circuit for electronic copying machines requires a dedicated frequency dividing circuit for driving the buzzer, which increases the number of parts, complicates the circuit, lowers reliability, and lowers the circuit board. There is a cripple that increases the area.

[Means and effects for solving the problems] The present invention has been made in view of the above problems, and aims to simplify the configuration by reducing the number of parts.

The present invention provides an alarm buzzer drive circuit for an electronic copying machine in which a reference clock of a main motor with a constant frequency in an audible range is used as a frequency signal for driving a buzzer.

〔Example〕

Hereinafter, a warning buzzer drive circuit for an electronic copying machine according to the present invention will be explained in detail.

FIG. 2 shows an entire embodiment of the present invention, and the same parts as in FIG. and frequencies close to the most audible frequencies (for example,
The reference clock of the frequency divider circuit 310 for the main motor 5 selected to output a signal of 1250 Hz) is connected to the gate 26.
It is designed so that it is applied to Naturally, as the reference clock is changed, the output pulse interval of the encoder coupled to the motor 5 is also changed. (Please note that the speed of the carry and motor 3 needs to be changed according to the reduction ratio, etc. Therefore, the frequency of the divided output is also 400 Hz to 1500 Hz.
z and cannot be used. ) With the above configuration, the 1250 Hz branch signal output from the frequency dividing circuit 31 that is constantly output during the operation of the OPU 22 is always supplied to one input terminal of the gate 26, and is output from the PPI 25 at the time of an alarm request. When the output alarm command signal is applied to the other input terminal of the gate 26, the AND condition of the gate 26 is satisfied and an output signal is generated from the gate 26. In response to this, the transistor 27 starts operating,
The piezoelectric buzzer 13 is driven and an alarm is issued.

In addition, in the configuration of 1 or more, the case where there is a frequency dividing circuit that can output a divided signal with a frequency close to an audibly preferable frequency has been described,
If the frequency is high with an even ratio or an odd ratio that is close to the opposite, even if the outputs of these frequency divider circuits are further divided,
Since only one IO is used, the number of parts can be reduced compared to providing a dedicated frequency dividing circuit for the buzzer.

In addition, although we have used the reference black signal for the main motor, if it is possible to obtain a branch output that outputs a frequency close to a frequency that is audibly preferable, it may be used regardless of its original purpose. . Furthermore, instead of the piezoelectric buzzer, buzzers based on other driving principles can also be used.

〔Effect of the invention〕

As explained above, according to the alarm buzzer drive circuit for an electronic copying machine according to the present invention, the four horns can also be used as a buzzer for other purposes.

The configuration can be simplified by reducing the number of parts.

Reliability can be improved. Additionally, the number of parts can be reduced, and the board area can be reduced accordingly.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional alarm buzzer drive circuit for an electrophotographic copying machine, and FIG. 2 is a block diagram showing an embodiment of the present invention. Explanation of symbols 1...Connor, 2...Main control board, 5...Main motor, 6...Drive unit, 21...Crystal oscillator, 22...OPU, 24...Pass line, 25・
...PPI, 26...gate, 27...transistor, 28...memory% 29...interface, 31...branch circuit. Patent applicant Fuji Xerox Co., Ltd. Agent Patent attorney Shin Matsubara 2 Patent attorney Kiyoshi Muraki Patent attorney Taira 1) Yudo Tadashi Patent attorney Atsushi Ueshima - Patent attorney Hitoshi Suzuki Figure 1 Figure 2

Claims (1)

[Claims] A microprocessor that controls a copying operation, and the microprocessor. In an electronic copying machine that includes an alarm buzzer that is driven based on a reference clock that is a frequency-divided clock. A logic condition is established between the frequency dividing circuit that divides the frequency of the reference clock into an audible frequency, the audible frequency reference clock output from the frequency dividing circuit, and the alarm command signal output from the microprocessor. 1. An alarm buzzer drive circuit for an electronic copying machine, comprising: a gate that sometimes generates an output signal; and a drive section that drives the alarm buzzer based on the output signal of the gate.