JPS58185286A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer capable of printing at equal intervals of desired printing line numbers in any printable range by using a system in which the length of printing paper is detected in a printable range even when the length of the paper is not measured by operator and the printing interval can be calculated on the basis of printing line numbers. CONSTITUTION:A printing paper charged in a printer PR is sent out toward the normal direction, a count value corresponding to the length of the paper is stored in a register RLFG, and the paper is restored to its initial position. The value of unprintable range which is determined by the mechanism of printer PR is deducted from the length of the printing paper to calculate a printable range and the content of a register RLFR is renewed. Line intervals are calculated from the content of the register RLFR having printable range and also the content of the register LINR having printing line number and then stored in a register LFR. Papers are sent out in the line direction by as much as line intervals stored in the register LFR.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and in particular, it is an improved printing device that calculates a printable range in the line direction of printing paper and easily prints within that range.

In conventional printing devices, when printing with a specific number of lines and equal line spacing within the printable area of printing paper, the operator measures the printable area in advance and calculates the measured value of 7 and the number of lines to be printed. The line spacing had to be calculated and printed based on the calculated results. However, the printable range may differ depending on the model of the printing device even for the same printing paper, and may differ depending on the way the printing paper is attached even for the printing device of the same model. Therefore, the operator has to measure the printable range and calculate the printing interval each time, which is inconvenient to use.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate such conventional drawbacks and to provide a printing method that can print a desired number of print lines at equal line spacing in any printable area without bothering the operator's hands. The purpose is to provide equipment.

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

FIG. 1 shows an example of the control section of the device of the present invention, where C
PU is a 5-micro processor that performs calculations, logical judgments, etc., and BUS is data between each part.

A bus serves as a transfer path for control signals and addresses.

KB kZ is a keyboard with each box key, KB
C is a keyboard controller that executes processing related to input keys from the keyboard KB. RAM is a random access memory that stores print data line by line. In this random access memory RAM, LIN
R is a register that stores the number of print lines entered from the keyboard KB, a register that stores the LFR & tabling interval, RLFR is a register that stores the printable range, LPl, Nl'L are the registers that are currently being printed. This is a register that indicates the number of lines inside, and its contents change to 1 each time one line of printing is completed.
be advanced.

Next, PR is a printer, PRTC4'! This controller PRTC&X executes the control procedure shown in FIG. q and FIG. The printer PR performs printer printing under the control of this controller PRTC. The ROM is a control memory that stores control procedures to be sent to the printer controller PRTC in response to commands from the keyboard KB.

Figure 2 shows an example of a keyboard KB, where KB/
This is a group of keys for manually inputting letters, numbers, etc. KB
, 2 t'! This is a group of 7 key keys, and only two keys, LIN and PK, are shown in the figure. PK is a print start key that commands the start of printing, and LIN is a line number specification key that specifies the number of lines to be printed in the printable area of the printing paper.After pressing this key LINY, the key group KB is pressed.
The number input via /Y is stored in the register LINR as the number of lines to be printed.

Figure 3 LA) to (1') sequentially show the positions ii of the printing paper during the printing operation of the apparatus of the present invention, where PH&)
Printer PRT/r: , print head in p'rt gobraten, P is print paper. Also, S is printing paper P
This is a sensor for detecting the terminal end χ.

Next, the operation of the apparatus of the present invention will be explained with reference to FIG. 1 and FIG. First, in step T/VC shown in FIG. 1, when the line number designation key LIN is pressed, the process advances to step T21c and input processing for the number of print lines is executed.

-f That is, the number inputted after pressing the key LIN is written as the number of lines in the register LINfL. Next, step T
3, when the print start key PK is pressed, step T4
(Proceed to step 7, and execute the printing process shown in detail in Figure 5.) The data to be printed is the 5-line alphabent shown in Figure 6(A), and the data to be printed is already in the random access memory RA.
Assume that it is stored in M.

The printing operation begins with the procedure Tg/IC shown in FIG.
The process begins with measuring the length of the printing paper. This process will be explained with reference to FIG. 3. First, as shown in FIG.
(clockwise direction as shown).

Here, the contents of the register RLFR, which stores the printable range, are incremented every 5 degrees of this paper feed by a predetermined line. This operation is continued until the sensor S detects the end of the printing paper P as shown in FIG. When the sensor S detects the end of the printing paper P, a count value corresponding to the length of the printing paper P is stored in the register RLFR. Thereafter, as shown in FIG. 3(C), the platen PT is rotated in the opposite direction (counterclockwise in the drawing) to return the printing paper P to the initial position, that is, the state VC shown in FIG. 3(A).

After calculating the length of the printing paper P in step Tl shown in FIG. 5, proceed to step Tl12.
The printable range calculation process [is performed to calculate the printable range L). This can be found by subtracting the value L of the printing area determined by the printer PLO mechanism from the length of the printing paper. Hence the register.

Subtract the value corresponding to the printing Komachi range from the contents of RLFFL W
Just hang it. Figure 3 CD) K shows the printable range and non-printable range. Next, the process proceeds to step T43, where the line spacing is calculated based on the contents of the V soster RLPR, which stores the printable range, and the contents of the register LINR, which stores the number of print lines. The calculated line spacing value is stored in register LFl'LK. After this, step T! via manual MTII! Proceed to
Performs printing processing for one line. The printing process is executed by the printer controller PRTC supplying the print data shown in FIG. 6(A) vc stored in the random access memory RAM to the printer PR one line at a time. Next, in step T6VC, the paper is fed in the row direction by an amount corresponding to the line spacing stored in the register LFR (..., and further, in step T≠71C, the print head P
Advance the contents of register LPINH by 47 steps, indicating the number of lines where H is currently located. In this way, steps T&G~T17
By repeatedly printing, printing is performed on the printing paper P as shown in FIG. 6(B) VC based on the printing data in the random access memory RAM shown in FIG. 6(A).

Next, in step TIII, if the contents of the register LPINR indicating the line number in which the print hand PET is placed match the contents of the register LINR where the print line number is recorded, then the It is determined that printing has been completed to the end of the printable range as shown in FIG. Feed printing paper P m1
゜In this way, the printing operation is completed.

In the above explanation, the length of the printing paper was measured using the sensor S, but the length is already known for standard printing paper, and the length is directly entered in the register RLFtt via the keyboard KB. It is preferable to memorize the length of the printing paper because it can omit the length measurement process (Step TII/ in FIG. 5).

As explained above, according to the present invention, the printable range can be detected and the print interval can be calculated based on the number of print lines without the operator having to measure the length of the printing paper in advance. It is possible to easily print a specified number of lines within the required printable range while keeping the line spacing constant.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the control section of the device of the present invention;
Fig. 2 is a layout diagram showing an example of the keyboard in the device shown in Fig. 1, and Figs. 3 (A) to (F) are diagrams showing the position of printing paper during printing operation in the device shown in Fig. 1 in order. ,
FIGS. 1 and 5 respectively show the printing operation in the device shown in FIG.
1 is a diagram showing an example of printing performed on the apparatus shown in the first figure. CPU...microprocessor, BU8...bus, KB...keyboard, KBC...keyboard controller, RAM...
・Random access memory [wa] LINK, LFEL, RLFI LPINR...
register. PR・-・Printer, PR'I'C・・Printer controller, ROM・-
・Control memory, KB/, KBJ...Key group, L
IN...Line number designation key, PK--Print start key, PH--Print head, FT--Platen, P--Print paper, S--Sensor. Patent Applicant: Canon Co., Ltd. Figure 3 (C) (D) Figure 4 Figure 6 1 ■ A b1

Claims (1)

[Scope of Claims] 1) Printable range specifying means for specifying the printable range in the line direction of the loaded printing paper; and print line number specifying means for specifying the number of print lines to be printed within the printable range. ,
The printable range specifying means VCJ1. calculating means for calculating a printing interval based on the printable range specified by the printing line number specifying means and the printing line number specified by the printing line number specifying means; What is claimed is: 1. A printing device characterized by comprising a printing means for printing within a range. 2. In the apparatus according to claim 1, the printable range specifying means includes a detection means for detecting the end of the printing paper in the line direction, and a detection means for detecting the end of the printing paper from the printing start position. The printing paper is fed in the forward direction until the end is detected, and when the end is detected, the VC sends the printing paper in the reverse direction and returns to the printing start position again. 7. The method further comprises a counting means for counting the forward feed amount of the printing paper, and a means for determining the printable range based on the count value of the counting means.
Characteristic printing device.