JPS62234962A - Printing method for printer - Google Patents

Abstract

PURPOSE:To prevent the space between the first line and the second line from becoming unstable by rotating a motor in reverse and normal direction when a paper is replaced, i.e. the device is switched from off-line mode to on-line mode. CONSTITUTION:The state of paper supply ended is cancelled by replenishing paper 1 supply when it is ended, and then a carriage home position setting operation is performed. After this, a motor is rotated in reverse direction by required number of steps, and successively is rotated back in normal direction by the same number of steps. Thus a backlash between the paper perforation 2 and a feed pin 3 by a gear and a slackness in the paper can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing method in a serial printer or the like.

[Conventional technology]

In serial printers, paper is normally fed by rotating feed bins by fitting paper feed pins (hereinafter referred to as feed pins) into paper holes provided on both sides of the paper.

The relationship between paper holes and feed pins in such a serial printer will be explained with reference to the drawings. Figures 2 and 3
The figure is a plan view showing the relationship between the paper hole and the feed bin, and Figure 4 is a perspective view showing the 1' @ drive system. In the figure, 1 is the paper, 2 is the paper hole, 3 is the feed bin, and 4 is the drive. Lonesome,
5, 6, 7.8 are gears, and 9 is a knob.

In the paper feed mechanism described above, when setting paper in the printer, fit the paper hole 2 into the feed bin 3 and turn the knob 9.
When the feed bin 3 is turned and set, the diameter of the feed bin 3 is smaller than the diameter of the paper hole 2, so a gap 10 is created between the paper hole 2 and the feed bin 3 as shown in FIG. When the paper is fed out, the gap 11 moves to the opposite side as shown in FIG. This means that the line spacing cannot be maintained correctly.

Further, as shown in FIG. 4, the gear 6 directly connected to the feed bin 3 between the gear 5 of the motor 4 and the gear 8 of the knob 9 is
When the motor 4 moves after feeding out the paper 1 a little, the gear 5.
6, backlash 12 occurs in the paper feeding direction. Similar to the above, this also causes incorrect line spacing.

In addition to the above-mentioned paper feed method using the paper hole and eye pin, a friction feed method that rotates the rollers sandwiching the paper and feeds the paper can be used as well. The backlash of the gear directly connected to the loaf between the gear and the knob causes the paper to sag.

Therefore, conventionally, the gap between the paper hole and the feed bin,
To remove backlash, slack, etc., manually turn the knob in the forward direction, or when turning on the power, feed the paper back and forth to the correct position to ensure correct line spacing. was.

[Problem that the invention seeks to solve]

However, according to the above-mentioned conventional technology, for example, when the paper is replaced at the end of the paper, the line break in the first line is incomplete.
The line feed interval becomes narrower, the printing interval gets clogged, and in severe cases, there is a problem of duplicate printing.

[Means for solving problems]

The present invention is characterized in that the motor is rotated in the reverse direction and the forward direction when switching from the off-line state to the on-line state, for example, when replacing paper.

[Effect]

According to the above configuration, after the paper is replenished when the paper ends, the paper end state is released, and the carriage returns to its origin (hereinafter referred to as homing operation), the motor is rotated in the opposite direction by a predetermined step. By subsequently rotating the same step in the forward direction and returning, it is possible to remove the gap between the paper hole and the feed bin, backlash caused by gears, slack in the paper, etc.

〔Example〕

An embodiment of the present invention will be described below according to the flowchart of FIG.

The following operations are performed when the power is turned on, when the self-test print mode is canceled and switched to the online state, and when the state such as paper end is canceled and the offline state is switched to the online state.

Sl Perform homing operation.

S2 Set the motor so that it rotates 16 steps (one step is 1/144 inch) in the opposite direction to the paper feeding direction (hereinafter referred to as the back direction).

S5 Drive the motor and rotate the paper 16 steps in the backward direction to return the paper.

S4 Check whether the motor has been driven for the set number of steps, and if not, continue driving.

S5: When the motor is driven, it is checked whether the rotation direction is in the backward direction, and if it is not in the backward direction, the operation is stopped.

Once S has also rotated normally in the backward direction by the set number of steps, the motor is then set to rotate in the paper feed direction (hereinafter referred to as the forward direction) by 16 steps.

As a result, only the amount returned in the backward direction by driving the motor is returned again.

In this way, the motor is rotated a predetermined amount in the backward direction,
Next, by rotating the paper by the same amount in the forward direction and returning it, it is possible to eliminate the gap between the paper hole and the feed bin, backlash caused by gears, slack in the paper, etc., which occurs when replacing the paper, etc. The instability that occurred between the eyes and the second line can be resolved.

〔Effect of the invention〕

According to the present invention described in detail above, when the power is turned on, when the self-test printing mode is canceled and switched to the online status, and when the status such as paper end is canceled and the status is switched from the offline status to the online status, etc. After the homing operation is completed, the paper feed motor is rotated in the opposite direction to the paper feed direction by a predetermined step, and then returned by the same step in the paper feed direction. This prevents the line spacing between the first line and the second line from starting printing from becoming unstable.
It is possible to eliminate accidents in which lines are printed overlappingly.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing one embodiment of the present invention, and FIG.
The figure is a plan view showing the state of the paper hole and the feed bin, Figure 3 is a plan view showing the state of the paper hole and the feed bin when the paper moves, and Figure 4 is the drive system of the feed bin. FIG. 1...Paper 2...Paper hole 3...Feed bin 4...Motor 5. 6. 7. 8...gear
9...Nov 10°11...Gap 12...Backlash patent Applicant: Oki Electric Industry Co., Ltd. Agent Patent attorney: Takashi Kanakura Nisuke 1. Planar axis when the feed bin is fitted into the drawing paper hole 2 Plan view when paper is at full speed 31 Perspective view of feed bin drive system @4Giil

Claims (1)

[Scope of Claims] 1. In a serial printer, etc., when the power is turned on, when the self-test printing mode is canceled and switched to the online state, and when the paper is finished and the paper is replaced, the state is switched from the offline state to the online state. After the carriage has completed its home positioning operation, such as when A printer printing method characterized by starting a printing operation.