JPS5857985A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer which can notify users a voltage drop without providing an appropriate displayed warning means by equipping a means to detect a battery power supply voltage drop, detecting the voltage drop and returning a carriage before abnormal operation of the device occurs. CONSTITUTION:An information for functional operation is input into an operation control circuit 2 from a key board 1 through a line (l1), while various informations from a printing section 4 are converted into a converting circuit 3 and input into the circuit 2 through a line (l2). The printing section 4 prints by a power supply battery 6 according to a driving signal outputted from the circuit 2 through a line (l3) and amplified in a driving circuit 5. On the other hand, a voltage comparison circuit 7 is equipped in the battery 6, and when the voltage of the battery 6 becomes lower than the specified voltage generated by a Zener diode 9 to be connected to a power source 8 which is stabilized by a DC-DC converter, a voltage lowering signal is transmitted to the circuit 2 through a line (l4) so as to make a carriage of the printing section 4 perform returning action, and to notify the users the lowering of the power supply voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects a drop in battery voltage in a serial printing device such as an electronic typewriter that uses a battery as a driving power source, and prevents the device from operating abnormally. This is to notify the user of a drop in battery voltage.

Now it is possible to use it. However, these conventional electronic typewriters operate abnormally when the battery voltage drops, and there is a risk of printing incorrect data or printing of unfavorable quality.

This invention was made with the aim of improving such conventional drawbacks, and it is possible to detect a drop in battery voltage before the device operates abnormally, and to notify the user of this without using any special indication means. I made it possible to inform. The present invention will be described in detail below based on drawings of embodiments.

FIG. 1 shows a block diagram of an electronic typewriter that is an embodiment of the present invention.

In FIG. 1, 1#i is a keyboard section for inputting information regarding printing of characters and symbols, and function operations such as spaces and carriage returns on a typewriter, and includes keys AZ, O to 9. Various symbols and various function command keys are arranged, and the line! It is input to the arithmetic control circuit 2 via l. 2-piece arithmetic control circuit, a read-only memory that converts microinstruction information for sequential control into digital signals, stores it, converts it, and discriminates the information, an arithmetic unit that performs arithmetic processing according to the information from the read-only memory, and numerical data. It consists of a group of registers that hold the data, an adder for performing calculations, and a control section for performing other controls. Reference numeral 6 denotes a conversion circuit for the detection signal obtained from the printing section 4, which processes various information from the printing section 4 in the arithmetic control circuit 2 and outputs it to the recalculation control circuit 2. 5Fi printing m 4 tA-drive circuit, line from arithmetic control circuit 2! The print section drive signal outputted via the converter is amplified to the print section drive level.

The driving power source for the printing unit 4 is a battery 6, and as shown in FIG.
When the voltage drops to % voltage V-13, the typewriter operates abnormally.

Therefore, a voltage of νS<>12) is set at 5K to provide a warning function at the end of normal operation.

In FIG. 1, battery voltage V is constantly compared with voltage υ1 by voltage comparison circuit 7. l11 is created by a Zener diode 9 connected to a power supply 8 stabilized by a DC-DC converter.

When the battery voltage is V) yx, the printing section 4Fi is operating normally, but when the battery voltage ■ decreases and becomes V-mwx, the voltage 11 is a value unique to each type of printing section, so adjust it appropriately for each type. It is preferable that the power supply 8, the Zener diode 9, and the voltage comparator circuit 7 are integrated with the printing section 4, and the whole forms a printing unit.

line! When a voltage drop signal is sent to the arithmetic and control circuit 2 via 4, the arithmetic and control circuit 2 separates the print head (not shown) of the printing unit 4 that is in contact with the printing paper from the 4-character paper during printing. After that, a signal t5 is outputted to the printing section 4 through the in-J's drive circuit 5 so as to execute a return operation of the carriage (not shown) of the printing section 4. In this way, the carriage returns during printing, allowing the user to know that the battery voltage has decreased.

Also, the carriage returned to the home position will not be moved by subsequent key manual force due to the presence of a voltage drop signal, or
Since the arithmetic control circuit 2 controls the printer so that printing is not performed even if the printer is moved, the user can more clearly know that the battery voltage has decreased.

Note that the same data may be used when the voltage drop signal is applied via the line 14 or when the carriage return key is input from the keyboard 1. Alternatively, the carriage return direction may be reversed so that the carriage stops and moves at a position opposite to the home position.

As described above, in the present invention, the carriage litter yt-fl is activated when a drop in battery voltage is detected, so that it is possible to effectively warn of a voltage drop without using a dedicated display warning means.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic typewriter according to an embodiment of the present invention, and FIG. 2 is a diagram showing changes in operating time t and 111 cell voltage V of the electronic typewriter. 4-・・・Printing section 6・0・Φ battery 7・・・Voltage comparator circuit To Canon Co., Ltd.

Claims (1)

[Claims] 1. A printing device comprising: a detection means for detecting a drop in battery power supply voltage; and based on the detection result of the detection means, a carriage return operation is performed to notify the decrease in battery power supply voltage.