JPH01238970A - Method for regulating buffer encoder in laser beam printer - Google Patents

Abstract

PURPOSE:To uniformize and simplify the regulation of a buffer encoder by a method wherein, a paper slack is generated by the amount allowing a buffer plate with paper loaded and fixed to be set at a reference value and, then, the output value of an encoder is displayed in a state where a buffer is positionally fixed. CONSTITUTION:With a buffer plate 2 down to the lowest limit, tractors 3 load paper 10 between a head rolls 4, 6. After being restrained by a paper sucking device 7, the paper 10 is fed by a reference slack amount in normal running by the tractors 3. By imparting a restoring force to the buffer plate 2, the buffer plate 2 is fixed to a reference position by the paper 10. In this state, the output of an encoder 1 is outputted to a panel 8 by a microcomputer, and a sign OK is displayed on the panel 8. The encoder 1 is regulated in a direction of an arrow B to be fixed at a position where the sign OK is displayed. In this manner, a dispersion by every operator is eliminated, and a regulating time can be reduced by conducting adjustment referring to a panel display.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an ig alignment mechanism for a buffer encoder of a laser beam printer.

[Background of the invention]

FIG. 2 shows an example of the basic configuration of a laser beam printer.

As shown in FIG. 2, when a thermal fixing method using a preheating plate 5, a heating roll 4, and a pressure roll 6 is used to fix the toner image attached to the paper, the paper is fed by a tractor 6; There are some differences between paper feeding by the heating roll 4 and the pressure roll 6. In order to prevent this speed difference from causing the paper to sag or pull too much, causing defects such as poor fixing and tearing due to wrinkles in the paper, a buffer should be provided between the two paper feeds to absorb the speed difference. is common.

However, the Patsufa 2 of the various leaf spring type shown in Fig.
In this case, there is a limit to the difference lζ between the paper feed amounts between the two paper feeds that can be absorbed due to implementation. For this reason.

It is necessary to monitor the angular change of the leaf spring (hereinafter referred to as buffer plate), set upper and lower limits, and detect it as an error. - An encoder is used inside the shell as a corner detector of the buffer plate to detect the upper corner and lower limit of the buffer plate. Adjustment at the time of installing the encoder was performed using a conventional method. The conventional method will be explained using FIG.

First, encoder 1 is fixed at an appropriate position.

Next, use the signal from the attached encoder 1 to actually operate the buffer plate. At that time, adjust the position of the buffer plate 2 and the adjustment reference position (corner 1' in the figure).
tA), thereby making encoder 1 again @
Arrange. Repeat this operation.

However, this adjustment method has the following drawbacks. First, there are large variations in adjustment due to machine tolerances and the skill level of workers.

Also, adjustment → operation → adjustment → 00. Since this is repeated, the tJ4 timing opening time may be delayed.

[Purpose of the invention]

The object of the present invention is to eliminate the drawbacks of the conventional branch body described above,
Seventh purpose is to make the buffer encoder adjustment uniform and to make it double.

[Summary of the invention]

The present invention focuses on the fact that adjustment can be easily performed by first fixing the buffer plate to the reference position lid and adjusting the encoder. The present invention relates to an encoder adjustment mechanism that fixes a buffer plate at a position and displays this position on a panel using a microphone to facilitate adjustment of the encoder.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

First, the tractor 6 loads the paper 10 between the heat rolls 4 with the buffer plate 2 lowered to its lower limit. Next, after the paper suction device 7 restrains the paper ℃, the tractor 6 feeds the paper ℃ by the standard slack angle during steady travel.

By giving the buffer plate 2 a restoring force, the buffer plate 2 is fixed at the reference position depending on the paper temperature. In this state 11iJζ, the output of the encoder 1 is output to the panel 8 by a microcomputer (not shown). When the encoder 1 is equipped with a slit plate as shown in FIG. 4, when the sensor slit for detecting the reference slit moves at the same angle as the reference slit 15 or the buffer plate 2, the panel 8 indicates OK. Display. By the way,
The operator adjusts the encoder 1 by 1ζ in the direction of arrow B, and uses the encoder adjustment mechanism 9 to fix the encoder 1 at a position where the panel 8jζOK is displayed.

〔Effect of the invention〕

According to the present invention, since the buffer plate is fixed according to the standard amount of slack that occurs when the paper is running steadily, there is no variation among operators, and since adjustment is made using the display on the panel, the adjustment time can be shortened. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a buffer encoder adjustment method according to the present invention, Fig. 2 is a schematic diagram of a configuration of a laser beam printer, Fig. 6 is a schematic diagram showing a conventional example of a buffer encoder adjustment method, and Fig. 4 is a schematic diagram showing a conventional example of a buffer encoder adjustment method. It is a front view of the slit plate of an encoder. In the figure, 1 is an encoder, 2 is a buffer plate,
6 is a tractor, 4 is a heating roll, 7 is a paper suction device, and 8 is a panel. Name of patent applicant: Hitachi Koki Co., Ltd.

Claims (1)

[Claims] A tractor that feeds continuous printing paper having feed holes at regular intervals by engaging with the feed holes; means for receiving the paper fed by the tractor and feeding it using two opposing rolls; 2
A buffer plate is provided between the two paper feeding means to absorb paper slack and tension caused by the difference in paper feeding speed between the two paper feeding means, a number of slits move in proportion to the angle of the buffer plate, and one slit serving as a reference. In a laser beam printer that has an encoder that has an encoder and a panel that displays the rotation angle of the encoder, the encoder is adjusted to generate the amount of paper slack from the loaded and fixed state of the paper until the buffer plate reaches the reference value. A method for adjusting a buffer encoder of a laser beam printer, characterized in that the output of the encoder is displayed with the position of the buffer fixed.