JPS6072768A - Paper feeder for printer - Google Patents

Abstract

PURPOSE:To perform a paper feeding efficiently at a high speed by feeding paper at a speed corresponding to a feed of a paper to be fed calculating it to eliminate hunting in a paper feeding mechanism. CONSTITUTION:When the paper feed is small, for example, when a signal for line feed is received continuously, the feeding of a paper is started by accelerating action 7 based on the first line feed signal to perform a constant rate feeding 8 at a low speed. When the second line feed signal is received in the course of this operation, the residual amount of paper to be fed based on the first line feed signal and the paper feed based on the second line feed signal are totalized. If the summed up value exceeds a specified value, the accelerating action 9 is further done to feed paper by a given length by a constant rate feeding 10 at a high speed. Subsequently, the decelerating action 11 is started to complete the specified paper feeding operation as early as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a paper feed device of a printer, particularly a line feed (LF),
This relates to a paper feed device of a printer that performs one paper feed at high speed when paper feed is performed based on a paper feed signal such as a page feed (FF).

(Technical background and problems) Conventionally, in printers, line feed signals (L, I”)
The paper feeding by one line by the FF signal and the paper feeding by one page by the page feed (FF) signal are both performed at the same paper feeding speed. For this reason, there is a problem in that, in the case of a page break that requires multiple paper feeds, it takes time to feed the paper.

Additionally, if the drive motor is set to feed the paper quickly in the case of a page feed (FF), it will have to be decelerated during acceleration in the case of a line feed (LF), resulting in undesirable phenomena such as hunting. There was a problem with putting it away.

(Object and Structure of the Invention) An object of the present invention is to solve the above-mentioned problems, and calculates the remaining amount of paper to be fed by one paper when feeding the paper in the printer, The purpose is to feed paper at high speed at a corresponding speed. For this purpose, the paper feeding device of the printer according to the present invention includes a receiving section that receives a paper feeding signal, a paper feeding amount calculation section that calculates the paper feeding amount based on the paper feeding signal received by the receiving section, and a paper feeding amount calculation section that calculates the paper feeding amount based on the paper feeding signal received by the receiving section. In a paper feed device of a printer, which has a paper feed control unit that drives a paper feed motor to feed paper based on a signal from a paper feed amount calculation unit, the current a paper feed remaining amount calculation unit that calculates a paper feed remaining amount to be fed;
a paper feed speed control unit that executes high-speed paper feed when the value calculated by the paper feed remaining amount calculation unit exceeds a predetermined value;
The present invention is characterized in that it includes at least the paper feed control section that drives the paper feed motor to feed the paper based on the signal from the paper feed speed control section.

(Example of the invention) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram illustrating one embodiment of the present invention.

2 and 3 show a flow chart of one embodiment of the present invention shown in FIG. 1, and FIG. 4 shows a configuration diagram of one embodiment of the present invention.

In the figure, 1 is a CPU, 2 is a program ROM, 3 is an external terminal, 4 is an I/P, 5 is a RAM, and 6 is a timer.

7 is a line feed motor drive circuit, 8 is a line feed motor drive circuit, and 8 is a line feed motor drive circuit.
Feed motor, 9 is C-GROfVI.

The semator 14 represents a display device.

Figure 1 (A+) shows the relationship between paper feed speed and time when the amount of paper to be fed by the printer is small (1), for example, line feed (LF).

As shown in Figure 1, for example, when feeding paper based on a line feed command, a predetermined starting signal is sent to the line feed motor, paper feeding is started with a constant acceleration operation (■ in the illustration), and after starting After the paper is fed a predetermined distance by performing a low constant speed feed (■ in the figure), a deceleration operation (■ in the figure) is started to complete the predetermined paper feed.

At this time, if the acceleration operation shown in 1 (■ in the figure) is continuously performed and an attempt is made to perform high-speed paper feeding, the deceleration operation (indicated in the figure ■) must occur during the acceleration operation, and the acceleration at this change point is significantly larger than when using the low-speed constant-speed feed (■ in the figure).

Undesirable phenomena such as hunting occur. Therefore, when the amount of paper feed is small, such as during a line feed, the time for acceleration operation (■ in the diagram) is naturally limited.

For this reason, when there is a large amount of paper feeding, such as during page breaks.

Conventionally, if the paper was fed at a low speed (■ in the figure) similar to the case where the amount of paper fed is small, there was a problem in that it took a long time.

Therefore, in the present invention, when the amount of paper feed is large such as during the page break, as shown in FIG.
Increase the time and perform high-speed constant speed feed (■ in the figure).
After feeding the paper a predetermined distance, a deceleration operation (■ in the figure) is performed to complete the predetermined paper feeding.

By doing so, it becomes possible to carry out paper feeding at a high speed compared to a conventional device that only performs slow constant speed feeding (indicated by ■ in the figure).

In addition, in the present invention, if a paper feed signal with a smaller paper feed amount is subsequently received, 1 For example, if a line feed (LF) is subsequently received, as shown in ':A-1 Figure tc), ,
First, if the paper feed amount is small based on the line feed signal of Fang 1 (
In the same way as in the case shown in Figure 1A), paper feeding is started by the acceleration operation (■ in the diagram).

If the remaining paper feed amount based on the first line feed signal and the paper feed amount based on the second line feed signal are totaled, and the total value is greater than a predetermined value, further acceleration operation is performed. (■ in the figure), and after the paper is fed a predetermined distance by high-speed constant speed feed (@ in the figure), a deceleration operation (■ in the figure) is started to quickly complete the predetermined paper feed. As described above, according to the present invention, the remaining paper feed amount that must be constantly fed is calculated, and the paper feed remaining amount is set to a predetermined value, that is, the desirably achieved by shifting to the deceleration operation during the aforementioned acceleration operation. If the value exceeds a predetermined value within a range in which phenomena such as hunting do not occur, the system shifts from low constant speed feed (■ in the figure) to high speed constant speed feed (indicated [phase] in the figure) to increase the speed of paper feed. can be executed.

Figure 2 is a flowchart of an embodiment of the present invention shown in Figure 1. 2 Preprocessing when the printer according to the present invention receives a paper feed command 2, such as a line feed (LF), from a host computer, etc. This is a flotsam showing the

7' Upon receiving a paper feed command from a host computer or the like, the paper feed device of the printer of the present invention calculates the number N of paper feed pulses corresponding to the received paper feed command by referring to a table or the like. (Illustrated ■).

If paper feeding is not currently in progress (NO in the illustration),
The calculated number N of paper feed pulses is set in the paper feed pulse counter C (■ in the figure).

Next, various parameters necessary for paper feeding are set (■ in the figure), and the paper feeding pulse signal is supplied to a line feed motor consisting of a pulse motor at predetermined intervals to determine the speed at which one paper is fed. Start the timer to be controlled (■ in the diagram).

Also, in the case of YES in the above-mentioned process (■).

In other words, if the paper is currently being fed, the number of paper feed pulses calculated by the process ``■'' is added to the paper feed pulse counter C to set the remaining number of 1 paper feed pulses (■ in the figure).
.

In Fig. 213, an interrupt request is made to the CPU according to the present invention by the timer of Fig. 2 processing (■) for the number of paper feeds set in the paper feed pulse counter C according to the flowchart shown in Fig. 2. If (YES), the following processing is performed, and if there is no one interrupt request (NO), the CPU enters a standby state.

■ Performs one-pulse paper feed. This causes the line feed motor to feed the paper by an amount corresponding to one pulse.

(2) subtracts 1 from the value stored in the paper feed pulse counter C. If the result of the subtraction is zero, the series of paper feeding processes is completed by a second process not shown.

■Compares the value C stored in the paper feed pulse counter C with the predetermined value M mentioned above, and if C, )M, (YES)
), the process (■) is performed, and if it is not CM (No), the process ends (END).

If the current paper feeding speed is high (YES), the process ends (END); if the current paper feeding speed is not high (NO), the acceleration process (2), ie, the process (2) or (2) shown in FIG. 1 is performed.

1, - In FIG. 4, reference numeral 1 in FIG. 1 is a CPU, which controls and executes various processes according to the present invention in accordance with instructions stored in the program ROM 2.

The CPU communicates with external terminals 3. ■ A line feed (
LP), page feed (FF), etc., and
It is stored in a predetermined area of AIVI5. The number N of paper feed pulses shown in FIG. 2 corresponding to the extracted paper feed signal is calculated with reference to a table in the program ROM 2 (second
Figure processing ■) If the paper is not currently being fed (NO in A12 Figure processing ■), the calculated paper feed pulse number N is set in the paper feed pulse counter C stored in RAM5 (Tree 2 Figure processing ■).
), and also starts the timer 6 for driving the line feed motor (processing ■ in Figure 2).

If the paper is currently being fed (YES in process ① in Figure 2), the paper feed pulse counter C stored in the RAM5 is
The calculated paper feed pulse number N is set to the value stored in
Set the value obtained by adding (Process ■ in Figure 2).

The interrupt signal for paper feeding from timer 6 is sent to the CPU
(Process ■ in FIG. 3), the CPU supplies the signal to the line feed motor 8 via the line feed motor drive circuit 7.

■ Paper feed corresponding to the pulse is performed (processing ■ in Figure 3).

The CPU subtracts the value stored in the paper feed pulse counter C stored in the RAM 5 by 1 (tree 3 diagram processing ■), and the value C stored in the paper feed pulse counter C that has been subtracted is as described above. If it is greater than the predetermined value M, if the current paper feeding speed is low, high-speed processing (313 figure processing ■);
In other words, by shortening the time set in timer 6, the line
The drive pulse interval supplied to the line feed motor via the feed motor drive circuit 7 is shortened to increase the paper feeding speed.

9. In order to print using the printer according to the present invention, as is known in the art, the CPU 1 receives a print signal from the host computer etc. via the external terminal 3.1/F4 and stores it in the RAM 5.
Temporarily stored in . on the other hand.

The CPU 1 supplies a signal to the carriage motor 13 via the carriage motor drive circuit 12 to drive the head 11 at a constant speed.

A dot pattern corresponding to the print signal stored in the RAM 5 is read from the CG (character generator) ROM 9, and is supplied to the head 11 via the head drive circuit 10, and printing is performed in synchronization with the carriage motor 13. . The display device 14 displays characters to be printed.

1 Represents an in-feed motor.

(Effects of the Invention) As explained above, according to the present invention, when feeding paper in a printer, the paper feed 'lft for one paper feed is calculated and the paper is fed at high speed at a speed corresponding to the paper feed amount. Therefore, one sheet of paper is fed quickly, and even when paper is fed at high speed, there is no problem such as hunting in the paper feeding mechanism, especially for line feed (LF) where the number of paper feed lines is small. Even if a signal is received one after another, the remaining paper feed amount is always calculated and high-speed paper feeding is executed when the remaining paper feed amount exceeds a predetermined value, resulting in extremely efficient paper feeding processing. will be executed quickly.

[Brief explanation of drawings]

172 and 3 are flowcharts of one embodiment of the present invention shown in FIG. FIG. 4 shows a configuration diagram of one embodiment of the present invention. In the figure, ■ is a CPU, 2 is a program ROM, 3 is an external terminal, 4 is ■/F, 5 is a RAM, and 6 is a timer. 7 is line feed motor drive circuit, 8 is 2. Patent applicant Mori, patent attorney representing Alps Electric Co., Ltd. 1) Hiroshi (3 others) Figure 1 F3! ! rPF1 Checkpoint Figure 2 $3I21

Claims (1)

[Claims] A receiving unit that receives a paper feed signal, a paper feed amount calculation unit that calculates the paper feed amount based on the paper feed signal received by the reception unit, and a paper feed amount calculation unit that calculates the paper feed amount based on the signal from the paper feed amount calculation unit. In a paper feed device of a printer having a paper feed control unit that feeds paper by driving a motor, the paper feed device calculates the remaining amount of paper to be currently fed based on the signal from the paper feed amount calculation unit. Based on the signal from the remaining amount calculation section, the paper feed speed control section that executes high-speed paper feeding when the value calculated by the paper contact remaining amount calculation section exceeds a predetermined value, and the paper contact feed speed control section. A paper feeding device for a printer, comprising at least the paper feeding control section that drives a paper feeding motor to feed the paper.