JPS6356869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for moving a carrier of an electronic typewriter in which data from a keyboard is electronically processed to automatically move the carrier.

In conventional electronic typewriters of this type, once the left margin is set, the set character pitch (10 pitches, 12 pitches, or
The carrier is moved intermittently by an amount corresponding to 15 pitches).

Figure 8 is for explaining this. In the figure, point M indicates the left margin, and line a is
Printing was performed with 10 pitches, and the b line indicates that printing was performed with 12 pitches.

In this way, in the past, the amount of movement of the carrier was determined relatively, so to speak, using the left margin M as a starting point, and the pitch was changed at point i midway on the c line, and the pitch was set from 12 pitch to 10 pitch. Then, the a line and c line are
Even if the pitch is the same, the printing position may shift, resulting in a difficult difference between the position of the pointer on the carrier side and the markings on the printing scale, and the printing ends may be random.

In the present invention, the amount of movement of the carrier relative to the character pitch is not calculated relatively from the left margin as the starting point, as in the past, but is calculated absolutely based on a certain predetermined position. In other words, the intermittent feed stop point for each character pitch (10 pitch, 12 pitch, 15 pitch) of the carrier is always calculated from the same specific reference position as the starting point, regardless of the left margin position. This is an attempt to eliminate the above-mentioned conventional drawbacks.

That is, in the present invention, the margin or tab set data is stored in memory for each character pitch as an absolute value that is graduated in character pitch units for each character pitch, starting from the left limit position of the carrier (the limit point of leftward movement of the carrier). Remember it. Then, for each print input from the keyboard, the currently set character pitch data is stored in the above memory, and the carrier is usually moved by an amount according to the stored character pitch data. During margin or tab set operation, , the character pitch margin or tab set data corresponding to the character pitch data stored therein is read out from the memory, and the carrier is moved to the position indicated by the data.

An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in Fig. 1, this electronic typewriter includes a keyboard 1, an I/O port 2, a CPU (central information processing unit) 3, a storage device RAM (random access memory) 4, and a ROM (read only memory) 5. , an I/O port 6, and a printing mechanism 7 including a motor for automatically moving a carrier (not shown).

RAM4 has 10 pitches, as shown in Figure 2.
Three tab stocks P10- that store the tab set positions for 12 pitches and 15 pitches respectively.
TS, P12-TS, P15-TS, a left margin register LM that stores the left margin position for each of these pitches, and a right margin register that also stores the right margin position, respectively.
RM, the right limit register RFM which similarly stores the right limit position, and the character pitch data currently set on the keyboard 1 (in this example, one of 10 pitches, 12 pitches, or 15 pitches). It includes a pitch register PR that is stored for each print input. Therefore, this pitch register PR is updated for each print input, and the carrier is moved by an amount according to the stored character pitch data.

Tab stock P10-TS, P12-TS, P1
5-The above data stored in TS, left margin register LM, right margin register RM, and right limit register RFM are all scaled in units of character pitch for each character pitch, starting from the left limit position of the carrier. It represents the absolute value.

Next, the carrier movement operation will be explained with reference to the flowcharts shown in FIGS. 3 to 6. Normally, the carrier movement is performed according to the following steps 100 to 112 for each character printed.

100...Clears I/O, each flag, and buffer, and performs initial settings.

101... Performs a key scan of the keyboard.

102...Determine whether or not there is key input data.

103... Determines whether the key input is a "return key".

104...Determine whether the current carrier position is the right limit position.

105... Determines whether the key input is a "margin release key".

106...It is determined whether the right margin flag RMF is set to "1", that is, whether there is a carrier on the right margin.

107... Determines whether the key input is the "tab key".

108... Determines whether the key input is a "function key" other than the above.

109...Reads the character pitch data set on the keyboard 1 and stores it in the pitch register PR.

110...Prints according to key input.

111...Moves the carrier based on the data stored in the pitch register PR.

112...Determines whether the current carrier position is at the right margin.

In 103 above, the key input is "return key"
When 200...reads character pitch data from keyboard 1 and stores it in pitch register PR.

201...Perform line feed.

202...Left margin register corresponding to the character pitch currently stored in pitch register PR
Load the LM data and move the carrier to that position.

203...Set the right margin flag to 0.

Execute the program, return to 101, and have the next key input.

When in the right limit position in 104 above, 101
and wait for the next keystroke.

Also, when using the right margin in 106 above,
Return to 101 and wait for the next keystroke.

Furthermore, when the "tab key" is pressed in 107 above, 204... reads the character pitch data from the keyboard 1 and stores it in the pitch register PR.

205...Three tab stocks P10-TS, P12
-TS, P15 - Pitch register of TS
Read the next tab data from the tab stock corresponding to the character pitch currently stored in PR.

206...Moves the carrier based on the read tab data.

Execute the program, return to 101, and wait for the next key input.

Other "function keys" in 108 above
In the case of 114...process based on the relevant function key.

After that, it returns to 101 and waits for the next key input.

In case of right margin in 112 above, 113...Set the right margin flag RMF to 1.

After that, it returns to 101 and waits for the next key input.

Note that in steps 110, 111, 114, 202, and 206, processes such as carrier position determination and tab data reading address designation are also performed.

Therefore, the carrier is normally moved by an amount according to the character pitch data currently set and stored in memory for each print input from the keyboard. During margin or tab set operation, the character pitch margin or tab set data corresponding to the character pitch data stored in the memory is read out from the memory, so for any character pitch, the carrier is at its left limit position. Starting from , each character is automatically moved to the margin set position or tab set position according to the graduated absolute value.

As shown in Fig. 7, both the d line with 10 pitches and the e line with 12 pitches,
The carrier is moved as if following a scale marked with absolute values for each pitch with a specific position 0 as a reference. Also, when switching from 12 pitch to 10 pitch at point g in the middle of the f line, the next printing point moves to point h, which is the scale point for 10 pitch, but the pitch shifts only when . , there is no deviation in the printing position at the same pitch as in other lines.

As is clear from the above, the present invention makes it possible to move the carrier as if it follows a scale that is graduated in absolute value for each pitch with a specific position as a reference. It has its features.

(1) There is no need to match the pitch of characters.

(2) Even if you change the character pitch in the middle of a line, the start and end of that line will match the start and end of other lines with the same character pitch.

(3) Since the print position can be determined by the number of characters, the program can be simpler than the conventional method, which determines the print position by the feed amount of the motor that drives the carrier.

(4) The position of the pointer on the carrier side always matches the markings on the printing scale.

(5) For any character pitch, the margin and tab set positions are set as absolute values with graduations for each character pitch starting from the left limit position of the carrier, so (1), (2), and (4) above are used. The same effect can be obtained during margin and tab set operations.

[Brief explanation of the drawing]

Figures 1 to 7 are for explaining one embodiment of the present invention. Figure 1 is a block diagram showing the configuration of the electronic typewriter, Figure 2 shows the storage format of the RAM in the block diagram, Figures 3 to 6 are flowcharts for explaining the operation, and Figure 7 is the printing mode (carrier movement mode).
It is an explanatory diagram for explaining. Further, FIG. 8 is an explanatory diagram for explaining a conventional printing mode (carrier movement mode). 1...keyboard, 4...memory
RAM, PR...Pitch register, P10-TS,
P12-TS, P15-TS...Tab stock,
LM...Left margin register, RM...Right margin register, RFM...Right limit register.

Claims (1)

[Claims] 1. In electronic typewriters that electronically process data from the keyboard and automatically move the carrier, margin or tab set data is
It is stored in memory for each character pitch as an absolute value that is graduated in units of character pitch for each character pitch, starting from the left limit position of the carrier.
For each print input from the keyboard, the currently set character pitch data is stored in the memory, and normally the carrier is moved by an amount according to the stored character pitch data. A method for moving a carrier in an electronic typewriter, characterized in that character pitch margin or tab set data corresponding to the character pitch data stored therein is read out from a memory, and the carrier is moved to a position indicated by the data.