JPS5842906B2 - printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a printing device having a printing section and an external storage device such as a paper tape punch section.

This printing device only prints, 0 paper tape punch only,
(3) It is possible to perform three types of operations: printing and tape punching.

If the connector connecting the operation mode switching section and the paper tape punching section becomes disconnected or has poor contact while performing the operation (2), punching will no longer be possible and data will be lost.

For this reason, conventionally, if a connector is disconnected or a contact failure occurs, an operator is warned or communication is temporarily interrupted.

However, with the method that warns the operator, data is lost while the operator is trying to eliminate the disconnected connector or poor contact, and with the method that temporarily suspends communication, for example, when a disconnected connector is detected and the connector is disconnected to the transmitting side. A device to notify the user is required, which makes the printing device expensive.

The object of the present invention is to eliminate such drawbacks, and the object is to provide a printing unit that includes a printing section and an operation mode switching section that switches the operation mode of an external storage device and input information between a printing mode and a storage mode. In the printing device in which the external storage device is connected to a connector, the operation mode switching unit switches the storage mode to the gold printing mode by detecting disconnection of the connector or poor contact in the storage mode. This is achieved by a printing device characterized by the following.

FIG. 1 is a diagram showing a printing device to which the present invention is applied.

In the figure, MD is the modem, KB is the keyboard, RD is the paper tape league, C0NT is the control unit, PC is the paper tape punch,
DC is a decoder, PCT is a printer control unit, M, 1. M
2 is a motor, H is a print head, SP is a print paper, M is a mode switching section, and the part surrounded by a dotted line is a printer section.

A modem MD is used for punching by the paper tape punch PC and printing on the print paper SP by the print head H.

This is done using signals from the keyboard KB and tape reader RD.

Namely, modem MD, keyboard KB, tape reader R
The control unit C0NT receives the output signal from D and outputs a strobe signal indicating the valid period of the signal and an output signal to the mode switching unit M.

The mode switching section M sends information and a strobe signal as output signals to either the printer or the tape punch PC.

When the information is sent to a printer, the decoder DC decodes the information and sends it to the printer controller PCT.

The printer controller PCT reads a pattern of characters to be printed from a memory (not shown) according to the signal decoded by the decoder DC, supplies this data to the print head H, and prints it on the print paper SP.

The printer controller PCT also provides a printing end drive signal for each character to the motor M2 for moving the print head, and when the head reaches a predetermined position, for example, the right corner, the motor M2
11t: Constructed to drive and line feed.

Also, when the information is sent to a paper tape punch PC, the paper tape punch PC punches the information in its entirety.

If the connector connecting the mode switching unit M and the paper tape punch PC is disconnected or has poor contact, punching will no longer be possible because strobe signals and information cannot be sent.

Therefore, the mode switching part M detects the disconnection of the connector,
Switch to print mode and print.

A mode switching section according to an embodiment of the present invention will be explained with reference to FIG.

In the figure, 1 is a signal line for transmitting a printing command signal, 2 is a signal line for transmitting a punching command signal, 3 is a signal line for transmitting a detection signal of connector disconnection or poor contact, 4
is an AND circuit, 5 and 6 are inverter circuits, 7 is a NAND circuit, and 8 is a changeover switch.

When printing, turn the switch 8 to the signal line 1 side.

Then, a low level signal is applied to signal line 1.

This signal is applied to one input of the AND circuit 4.

On the other hand, when the connector is not disconnected, etc., a low level signal is applied to the signal line 3.

This signal line 3 is connected to a grounded terminal of the connector.

This low level signal is made high level by the inverter circuit 6 and is applied to the other input of the AND circuit 4.

At this time, the output from the AND circuit 4 becomes low level, so that a printing operation is performed.

When performing a punching operation, the switch 8 and the signal line 2 are connected.

As a result, the level of the signal line 2 changes from a high level to a low level, but the inverter circuit 5 applies the signal to one input of the circuit 7, which is at a high level.

Further, when the connector is not disconnected, the signal on the signal line 3 is at a low level, and the signal is brought to a high level by the inverter circuit 6 and is applied to the other input terminal of the circuit 7.

Therefore, the output from circuit 7 will be at a low level, thereby effecting punching.

If the connector becomes disconnected here, the level of signal line 3 will go up.
A high level of 5 V is obtained, which is converted to a low level by the inverter circuit 6 and applied to the other input of the circuit 7.

Therefore, a high level signal is output from the circuit 7 and the punching is stopped.

Also, a low level signal from the inverter circuit 6 is applied to the other input of the AND circuit 4, and since one input of the AND circuit 4 is at a high level of +5■, a low level signal is output from the AND circuit 4. is output, and information that could not be punched is printed.

As described above, since the printing operation can be performed when the connector is disconnected, data will not be lost.

Although a paper tape punch has been shown as an example of the storage section outside the cylinder, a disk or the like may also be connected thereto.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a printing device to which the present invention is applied, and FIG. 2 is a diagram showing an embodiment of the present invention. In the figure, 1, 2 and 3 are signal lines, 4 is an AND circuit, 5.6 is an inverter circuit, 7 is an AND circuit including an inverter, and 8 is a changeover switch.

Claims (1)

[Claims] 1. A storage mode instruction signal line that receives output information from a control unit that controls multiple input devices and enables output to an external storage device, and a print mode instruction signal line that enables output to a printing device. and an operation mode switching unit that switches the instruction signal line for the storage mode or the instruction signal line for the print mode, and in the printing device in which the external storage device is disconnected from the connector, the connector can be disconnected or disconnected. connected to a transmission line for a detection signal indicating poor contact, an instruction signal line for the storage mode, and an instruction signal line for the print mode;
A printing device further comprising a circuit that inhibits output of the instruction signal line for the storage mode and enables output of the instruction signal line for the print mode based on a detection signal of the transmission line.