JPS6243806Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device of a printing device such as a line printer, which is controlled by an interface having only a single line feed command as a command for indicating the number of line feeds.

Conventionally, the interface has been used in low-speed serial printers, but in recent years it is increasingly being used in high-speed line printers as well.

In a printing device controlled by such an interface, when a job including multiple line feeds is executed, there is a problem in that the effective printing speed decreases.
This is because the interface only has single line feed commands, page feed commands, and line feed commands up to a predetermined specific position, and does not have multiple line feed commands. For example, in order to make a line feed of five lines, it is necessary to transfer the single line feed command five times, and the printing device performs a line feed of one line five times as shown in FIG. For this reason, the first
As is clear from the figure, acceleration, deceleration time, paper stabilization time, and line feed prohibition time are required each time a line is added, and the paper feeding time becomes extremely long.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to prevent the effective printing speed from decreasing even when a printing device controlled by an interface that does not have multiple line feed commands executes a job that includes multiple line feeds. It is to do so.

In this invention, when single line feed commands are transferred in succession, the number of transferred single line feed commands is counted, and the counted number of line feeds is collectively processed as shown in Figure 2. It is characterized by this.

The present invention will be described below with reference to the drawings.

For example, data source 1 such as CPU is a signal
Interface data in synchronization with STROBE iF
Transfer to. The transferred data is stored in a 1-byte buffer 2. The decoder 3 determines whether the data stored in the buffer 2 is a single line feed command or not, and if it is not a single line feed command or a single line feed command, outputs a logic value 1 to the LF code output terminal and the NOT LF output terminal. Occur. If the data is a single line feed command, the data is not sent to the interface control unit 4 by the data capture control unit 9, but is sent to the decoder 3.
The signal at the LF code output end of is added to the counter 5, and the number of transfers of single line feed commands is counted. 1
When n line feed commands are sent consecutively, counter 5
The count value becomes n, and the flip-flop 6 remains set.

If, for example, a print code other than a single line feed command is transferred thereafter, the print code is stored in the 1-byte buffer 2, and the decoder 3 generates an output of logical value 1 at the NOT LF code output terminal to reset the flip-flop 6. . flipflop 6
When the output terminal on the O side becomes a logical value 1, the pulse generating circuit 7 generates an output of a logical value 1, sends the count value n of the counter 5 to the paper feed control section 8, and operates the paper feed control section 8, as shown in the figure. A line feed of n lines is started via the paper feed drive unit that does not operate. When the n-line line feed ends, a signal FEED indicating that paper feed is in progress is sent.
becomes a logical value of 0, and as a result, the printed code stored in the buffer 2 is sent to the interface control section 4, and subsequent data transfer is continued. Although not shown, it is assumed that the counter 5 is cleared at the timing when the signal FEED becomes a logical value of 0.

Timer 10 transfers the single line feed command last,
This is to eliminate the inconvenience that the last line feed command is not executed after the data transfer is completed. It is composed of a multi-vibrator, etc. If no data is transferred until a predetermined period of time T has elapsed after the one-line line feed command was transferred, the timer 10 generates an output of logical value 1 after the elapse of the predetermined period of time T, operates the paper feed control unit 8, and performs a line feed. start. Although not shown, the timer 10 is
It is assumed that the LF code output terminal is reset at the timing when the logic value becomes 1 and no output is generated.

FIG. 4 is a time chart showing the process when the one-line line feed command is transferred five times, the print code A is transferred, and the one-line line feed instruction is further transferred once, and the data transfer ends.

As described above, according to the present invention, even if a single line feed command is transferred in succession, instead of starting a line break each time, the number of transferred commands is counted and multiple lines are broken at once. It becomes possible to significantly shorten the paper feeding time and improve the effective printing speed.

[Brief explanation of the drawing]

Fig. 1 is a time chart showing a conventional paper feeding method, Fig. 2 is a time chart showing a paper feeding method according to the present invention, Fig. 3 is a block diagram showing an embodiment of the present invention device, and Fig. 4 is a time chart showing a paper feeding method according to the present invention. This is a time chart for explaining the operation of FIG. 3. In the figure, 1 is a data source, 2 is a 1-byte buffer, 3 is a decoder, 4 is an interface control unit, 5 is a counter, 6 is a flip, 7 is a pulse generation circuit, 8 is a paper feed control unit, and 9 is a data import control unit. 10 is a timer.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a printing device controlled by an interface having only a single line feed command as a command for indicating the number of line feeds, a 1-byte buffer that stores 1 byte of data at the time of receiving the data; a decoder that determines whether the data stored in the 1-byte buffer is the 1-line feed instruction and outputs a 1-line feed instruction or a non-single-line feed instruction in response to the determination result; If it is determined that this is the case, the paper feed control unit includes a counter that counts the number of consecutively transferred single line feed commands, and a paper feed control unit that feeds the paper by the number of line feeds counted by the counter. A paper feeding device characterized in that line feeds are caused by the number of line feeds counted by the counter at once. 2 As input is a non-single line feed command of the decoder,
2. The paper feeding device according to claim 1, wherein the paper feeding control section starts operating by a pulse from a pulse generation circuit that generates a pulse when the input is received. 3. A utility model characterized in that the paper feed control section is started to operate by an output pulse of a timer which receives a single line feed command of the decoder as input and generates a pulse after a predetermined time has elapsed since the input of the single line feed command. A paper feeding device according to registered claim 1.