JPH08238815A - Control method for paper feed of dot line printer - Google Patents

Abstract

PURPOSE: To carry out high precision printing by minimizing the decrease in printing throughput irrespective of the thickness of fed paper and keeping a paper feeding motor in a good condition. CONSTITUTION: After a PF START signal being received, when the distance between the perforation of a paper sheet and a hammer L is smaller than L0, and the thickness of the sheet THK is larger than THK0, a mutual change-over data table TBL0 is selected, and in other cases, a mutual change-over data table TBL1 is selected to make a paper feed speed variable to keep a paper feeding motor in a good condition and to enable high precision printing. When a paper load is small, the paper feed speed is increased to minimize the decrease in printing throughput.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed control method for a dot line printer which performs high precision and high speed printing.

[0002]

2. Description of the Related Art According to a conventional paper feed control method for a dot line printer, when the perforation of the paper having the largest paper thickness passes between the hammer bank and the platen and the paper load becomes maximum. In addition, the paper feed motor is adjusted according to the conditions when the paper load is maximum so that the paper can be fed at the same maximum paper feed speed even when the paper load passing through the perforations of paper with a small paper thickness is small. Had determined the torque and rotation speed.

[0003]

In the conventional paper feed control method for the dot line printer, the maximum values of the torque and the rotation speed of the paper feed motor are determined by the above conditions.

Therefore, when the paper thickness is small and the paper load is small, the paper feed speed must be set low although the torque and the rotational speed of the paper feed motor still have a surplus, and the print throughput decreases. There is a problem.

Further, if the rotation speed of the paper feed motor is set in accordance with the paper thickness being small and the paper load being small, the paper feeding motor of the paper feeding motor will be operated when the paper load is large such as when the paper thickness is large and perforations pass through. There is a problem in that the torque is insufficient to cause step out and the paper cannot be fed.

According to the present invention, the paper feed control of a dot line printer that minimizes the decrease in print throughput when feeding paper of any paper thickness and prevents out-of-step of the paper feed motor to perform accurate printing is performed. The purpose is to get a way.

[0007]

In order to achieve the above object, in a paper feed control method for a dot line printer according to the present invention, a paper perforation is passing between the hammer bank and the platen. The paper feed control program is provided as a speed varying means for detecting and measuring the paper thickness with the paper thickness sensor, selecting the paper feed motor phase switching time data table from the two conditions, and varying the paper feed speed. It is a thing.

[0008]

In the paper feed control method for the dot line printer constructed as described above, the paper feed control program causes the paper feed motor to advance by one dot line, and the preset dot line for one page of paper is preset. The number, that is, the length from one sheet perforation to the next sheet perforation is compared with the number of dot lines in which the sheet is fed from a certain sheet perforation.

In the section where the paper perforation reaches between the hammer bank and the platen and the paper load becomes large, the paper feed is performed when the paper thickness measured by the paper thickness sensor is a certain value or more. Select the phase switching time data table with a low motor rotation speed, and conversely, if the paper perforation does not reach between the hammer bank and the platen, or if the paper thickness is less than a certain value, the paper load Therefore, the phase switching time data table in which the rotation speed of the paper feed motor is high is selected.

In this way, the paper feed speed can be changed according to the paper thickness.

[0011]

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

In FIG. 2, when the print paper feed control microcomputer 1 sends a start command to the shuttle control microcomputer 6 based on the data from the host device, the shuttle control microcomputer 6 drives the shuttle mechanism section 16 to drive the hammer bank 15 Reciprocate to print.

Printing is performed each time the hammer bank 15 makes one stroke, and during the next stroke, the shuttle control microcomputer 6 sends the print paper feed control microcomputer 1 to PF STAR.
The T signal 18 is sent.

In FIG. 1, the paper feed control program of the print paper feed microcomputer 1 detects the PF START signal 18 and feeds paper by a predetermined number of dot lines, while presetting one page of the paper 13. From the number of dot lines and the number of dot lines sent from the paper perforation, the paper perforation reaches between the hammer bank 15 and the platen 14, and the distance L between the paper perforation and the hammer bank 15 shown in FIG. When the decrease is detected, it is compared whether the paper thickness THK measured by the paper thickness sensor 17 in advance is larger than THK0, which increases the paper load, and T
When HK> THK0, the phase switching data in the data table TBL0 shown in FIGS. 4 and 6 is selected and the paper is fed at the paper feeding speed V0.

As shown in FIG. 7, the paper feed motor 9 has a torque Tr at a low paper feed speed V0.
Torque Tr when q0 is high paper feed speed V1
It has the characteristic of being larger than q1.

Therefore, if the paper is fed at the paper feed speed V0, the paper feed motor 9 can feed the paper without stepping out even when the paper load is large such that the paper perforation having a large paper thickness passes through. it can.

Further, in FIG. 6, when the distance L between the paper perforation and the hammer bank 15 is larger than L0, or when the paper thickness THK is smaller than THK0 in FIG. Since the phase switching data in the data table TBL1 shown in (3) is selected and the paper is fed at the paper feeding speed V1, the paper feeding speed can be increased.

[0018]

As described above, according to the present invention, when the sheet perforation passes between the hammer bank and the platen, the sheet feeding speed can be changed according to the sheet thickness, so that the sheet load is reduced. It is possible to prevent the stepping of the paper feed motor when it is large and improve the paper feed accuracy, and it is possible to increase the paper feed speed when the paper load is small, so the drop in the print throughput of the dot line printer is minimized. Can be

[Brief description of drawings]

FIG. 1 is a flowchart of a paper feed control program showing an embodiment of a paper feed control method for a dot line printer of the present invention.

FIG. 2 is a block diagram of a control circuit controlled by the paper feed control program of FIG. 1 and a diagram of a mechanical section.

FIG. 3 is a diagram showing the positions of a hammer bank, a platen, and paper perforations.

FIG. 4 is a diagram showing a phase switching time data table TBL0.

FIG. 5 is a diagram showing a phase switching time data table TBL1.

FIG. 6 is a time vs. paper feed speed diagram based on the data of the phase switching time data table TBL0 and the phase switching time data table TBL1.

FIG. 7 is a diagram of a paper feed speed of a paper feed motor versus a paper feed motor torque.

[Explanation of symbols]

1 is a print paper feed control microcomputer, 2 is an I / O port, 3 is a timer 1, 4 is a memory 1, 5 is an operation panel, 6 is a shuttle control microcomputer, 7 is an I / O port 2, 8 is a driver 2, 9 Is a paper feed motor, 10 is a pulley, 11 is a timing belt, 12 is a tractor, 13 is paper, 14 is a platen, 15 is a hammer bank, 16 is a shuttle mechanism section, 17
Is a paper thickness sensor, 18 is a PF START signal, and 19 is a driver 1.

Claims (1)

[Claims] 1. A hammer bank having a plurality of dot hammer rows in the horizontal direction, a shuttle mechanism section for reciprocating the hammer bank in the horizontal direction, a platen, a paper feed mechanism section for feeding the paper, In a dot line printer equipped with a paper thickness sensor for measuring paper thickness, a speed at which the paper feed speed is changed according to the paper thickness of the paper when the paper perforation passes between the hammer bank and the platen. A paper feed control method for a dot line printer, characterized in that the paper feed mechanism section is provided with variable means.