JPH0257790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to carriage space feeding for electronic typewriters.

<Prior Art> In a conventional electronic typewriter, when the space key is input, the host CPU instructs the carriage to move by one space and moves the carriage.

As shown in Fig. 1, the space key is a two-action key that corresponds to the amount of press of the space key SP, and when pressed lightly, switch SW ₁ is closed, and when pressed strongly, switch SW ₂ is closed. . This switch SW ₁ means a key input of the space key SP, and the switch SW ₂ means a repeat of the key input.

Therefore, the host CPU checks the next key input state while the carriage is moving one space, and if the space key SP is in the repeat state at this time, it first waits for the carriage to complete moving one space, and then When this space feed is completed, the next 1
A movement instruction for one space is given, and the carriage is further advanced by one space. Below, space key
When SP is in the repeat state, the above operation is repeated.

FIG. 2 shows the state of this carriage during continuous operation.

That is, in FIG. 2, (A) shows the operating state of the space key, (B) shows the carriage instruction of the host CPU, and (C) shows the operating state of the carriage.

As can be seen from FIG. 2, when the space key is in the repeat state and the carriage is continuously fed, the carriage advances by repeating a series of acceleration, deceleration, and stop operations.

Therefore, when the carriage is continuously fed, the feeding speed becomes slow and noise and vibrations are generated.

In order to eliminate these drawbacks, conventional techniques such as the one shown in Japanese Patent Application Laid-Open No. 15384-1984 have become well-known, and it is sufficient to drive the carriage continuously without stopping it in continuous space operations. There is. In other words, when carriage operation signals are input continuously, the first input signal immediately starts driving the carriage, and when the second signal arrives, the amount of carriage movement relative to the first input signal is changed. In some cases, the movement amount of the second input signal is added to the movement amount of the second input signal to drive the carriage continuously without temporarily stopping the operation.

In the above technique, the input timing of the second signal is input in accordance with the input synchronization signal, and is not synchronized with the movement of the carriage. Therefore, the carriage moves as fast as the number of spaces entered on the keyboard, and if the operator performs input operations by looking only at the movement of the carriage,
Even if you stop inputting spaces when the carriage reaches the desired position, processing is executed with a large number of spaces already input, so the carriage will be moved far beyond the desired stop position by the extra space. There were some drawbacks.

<Purpose> The present invention provides a method for continuously feeding a carriage.
To provide a control method that allows a space input to be performed in accordance with the operating sense of an operator, is fast, and prevents noise and vibration from occurring.

<Example> Fig. 3 is a block diagram showing the configuration of an electronic typewriter, which includes a host CPU 1, a keyboard 2, a wheel slave CPU 3, a wheel servo circuit 4, a carriage slave CPU 5,
It is composed of a carriage servo circuit 6, a ribbon drive circuit 7, a paper feed drive circuit 8, a display slave CPU 9, and a display drive circuit 10.

Further, the keyboard 2 includes a space key SP similar to the configuration shown in FIG. 1 above.

FIG. 4 shows the configuration between the host CPU 1, the carriage slave CPU 5, and the carriage servo circuit 6.

First, when the space key SP is pressed, the key signal is input to the host CPU 1. and,
The host CPU 1 instructs the carriage slave CPU 5 to advance the carriage by one space.

In this case, the instructions are for the carriage slave CPU.
After confirming that the operation end signal output from 5 is ON, the data bus transmits information such as the amount and direction of carriage movement, presence or absence of repeating, and instructions for only carriage feed or print feed.

When data is sent to the carriage slave CPU 5, an interrupt occurs and data is taken in.

To import this data, first turn off the end signal as shown in Fig. 5, and then only carry out carriage advance (i.e., when the space key, tab key, carriage return key, etc. When pressed), the flow is divided into two. When the space key SP is pressed, only the carriage feeds, so proceed downwards, and input the amount of movement from the data to the SUB register 52, the direction of movement to the carriage servo circuit 6, and the speed value from the value of the SUB register 52 to the carriage servo circuit 6. send.

As a result, the servo circuit 6 operates and the carriage motor is driven. Then, a position signal is outputted by an encoder directly connected to the carriage motor and sent to the carriage slave CPU 5. Applicable
CPU5 performs SUB-1 every time a position signal is output,
When SUB=0, a stop command is issued, and the carriage reaches the target position and ends. At that time, turn on the end signal
Then, the next instruction will be received from host CPU1.

By the way, as the amount of movement of the SUB register 52, for example, "30" is sent as a data value for one space, and it is subtracted by "1" based on the position signal.
Then, at the time of SUB=6, host CPU1
Determine whether there is a space key repeat instruction in the data from , and if there is a repeat instruction, set the REPET flag 51, and turn on the end signal at this point.
At the same time, instructions from the host CPU 1 can be accepted.

When the end signal turns ON, the host CPU 1 receives an interrupt on the host side and issues the next instruction.

When the carriage slave CPU 5 receives the next data, an interrupt occurs and data is taken in. To explain this using the flowchart of FIG. 6, unlike last time, the REPET flag is set, so the current movement amount is added to the remaining value of SUB and that value is placed in SUB.

Then, until receiving instructions from host CPU1,
SUB has a value of SUB < 6, and the carriage is decelerating during this time, but the host CPU
With the instruction from SUB, the next amount of movement is added, so it starts accelerating again. In other words, the carriage is not stopped.

The above-mentioned operation is shown in Figure 7, where (A) is the space key operation, (B) is the instruction from the host CPU 1,
(C) shows the movement of the carriage.

That is, an instruction is issued from the host CPU 1 at point a, acceleration is performed after loading, and deceleration is started at point b from the value of SUB. In C, SUB=6 and a completion signal is sent to the host CPU1. The host CPU 1 instructs the next space feed, adds it to the rest of SUB at the time of capture, and immediately starts accelerating. The rest of the operation is the same as described above, starting deceleration at d and issuing a completion signal at e.

As you can clearly see by comparing Figure 2 and Figure 7,
In the figure, when the speed of the carriage drops to a certain speed, the speed increases again, and the carriage is fed smoothly, and as a result, noise and vibration are reduced. (In Figure 2, the carriage stops and then starts again.) Note that the reason why the end signal is issued at SUB=6 is based on the operating sense of a person who controls the space feed speed within a certain range and operates the carriage feed. By detecting the next space feed signal one character at a time while the previous space key is in progress, there is no need to memorize the extra space feed amount, and the operator can repeat the space key. The carriage can be stopped immediately upon completion of the operation.

<Effects> As described above, in the carriage feed control of the present invention, the carriage can operate at high speed and without noise and vibration even during continuous feed operation, which improves performance and usage. It has excellent effects.

Further, even if the operator only watches the movement of the carriage during the operation, the carriage can be stopped immediately upon releasing the space key.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of the space key, Fig. 2 is a diagram showing the conventional carriage operation, Fig. 3 is a block diagram showing the configuration of the electronic typewriter according to the present invention, and Fig. 4 is a diagram showing the configuration of the electronic typewriter according to the present invention. 5 and 6 are flowcharts showing the operation of the typewriter, and FIG. 7 is a diagram showing the carriage operation of the typewriter. 1...Host CPU, 2...Keyboard, 3...
...Slave CPU for wheels, 5...Slave CPU for carriage, 6...Carriage servo circuit.

Claims (1)

[Claims] 1. According to the space key operation on the keyboard, a space is moved by a predetermined movement amount in units of one space, and during the space feeding, the next space feed instruction is detected, and the next space feed instruction is detected. In the carriage control method, the carriage is continuously fed the next space without stopping when there is a space feed instruction, and the carriage is stopped when there is no space feed instruction. In response to detection of arrival at a predetermined position immediately before the end of a predetermined movement of one space unit as the carriage moves, the presence or absence of the next space feed instruction signal is detected, and when there is a next space feed instruction, In order to continuously feed in units of 1 space, the deceleration drive of the carriage is switched to acceleration drive, and space feed is performed continuously without stopping the carriage. By controlling the carriage in units of 1 space, space A method for controlling a carriage of an electronic typewriter, characterized in that key operations and the amount of movement of the carriage are matched to match an operator's operating sense.