JPS5920686A - Printing position adjustor - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of the printing position with a simple construction by delaying a signal to be provided to a tractor controlling circuit from a print controlling circuit. CONSTITUTION:As soon as a print start signal is inputted into a control circuit 1 from an upper unit, a print signal is provided to a video signal output circuit 2, which provides a video signal to an optical unit 3 to allow information to be written onto a photosensitive drum 4. A delay circuit 5 into which a tractor start signal was inputted from the circuit 1 outputs a signal delayed by time set with a vertical position setting switch 6 for adjusting mechanical position. With a delay circuit 7, a signal delayed by time set with a vertical position setting switch 8 on an operator panel 1 is provided to a control circuit 9, which drives a tractor 12 with motors 10 and 11.

Description

Detailed Description of the Invention (4) Technical Field of the Invention The present invention relates to a print position adjustment device suitable for setting the vertical position of print output in a printing device such as an electrophotographic device or an electrostatic recording device. It is something.

ω) Background of the Technology In recent years, as electronic calculators have become faster, output devices such as line printers have been intensively researched and developed to increase speed and improve operability.

(O Prior Art and Problems) Conventionally, in line printers and the like, the print output position in the vertical direction (conveyance direction) of paper is sometimes set by a switch on the operator panel.

Therefore, it is necessary to perform Jj adjustment of the apparatus so that the position designated by this switch and the printed position are the same.

However, in general, paper transport is carried out by a tractor having a transport protrusion that engages with a paper feed hole in the paper.

This tractor is driven by a pulse motor, so
I was able to set the position accurately.

Conventionally, the 617 board with this type of printing position was SI
A method of N was used.

However, this method has the disadvantage that the adjustment mechanism is complicated because the device itself is finely adjusted, and the adjustment is very troublesome.

Furthermore, in recent years, some line printers and the like automatically load paper.

Such a device has a metric load u1 with the tractor position.
This method has the drawback that the loading paper table used for loading the paper in the j stage must be interlocked, and the adjustment G% tie becomes more complicated.

(2) Purpose of the Invention In view of the above-mentioned drawbacks, the present invention has a simple configuration that allows easy adjustment of the printing position. An object of the present invention is to provide a print position adjustment device that can perform alignment.

(g) Structure of the invention According to the invention, the present invention provides an NWA forming medium on which a latent image is formed, a crystal image forming means 9 for forming a latent image on the latent image forming medium, and a crystal image forming means 9 for forming a latent image on the latent image forming medium. When a latent image form t2+ start signal is output to the forming medium, the medium conveying means for supplying the recording medium, the driving means for driving the medium conveying means, and the latent image forming means, the printing control means sends a signal to the moving element stage. This is achieved by providing a print position adjustment device characterized by comprising means that can vary the timing of applying the drive signal.

CF) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram for explaining a print position adjusting device according to this embodiment.

In the figure, when a print start signal from a host device is input to a print control circuit 1, the print control circuit 1 outputs a print signal to a video signal output circuit 2. The video signal output circuit 2 to which the print signal has been input inputs the video signal to the optical unit 8.

Eight optical units write information by irradiating a laser beam onto the photosensitive drum 4 at a position indicated by the symbol in the figure.

Here, the rotational speed of the photosensitive drum 40 is ω(rad/5ea
), position A on the photosensitive drum 4 irradiated with the laser beam
If the angle from the transfer position to the paper 18, the position indicated by symbol B in the figure, is θ (rad), then from the time when the optical unit 3 irradiates the photosensitive drum 4 with the laser beam, t=θ
After a delay of /ω(see) time, the printing position on the paper 18 is aligned with the transfer position by driving the conveying means 12 of the paper 18, so that the image can be transferred to a predetermined position on the paper 18. becomes.

Therefore, the print control circuit 1 receives the print start signal from the host device and outputs the tractor start signal after a time t (sea) from the time when the print signal is output to the video signal output circuit 2.

In reality, the tractor start signal is output earlier by the fall time of the motor and tractor.

The delay circuit 5 to which the tractor start signal from the print control circuit 1 is input outputs the signal after being delayed by the time set by the vertical position setting switch 6 for mechanical position adjustment.

In other words, a signal delayed by five vertical position setting keys, which is performed for mechanical position adjustment after assembly of the device, is output.

Further, the delay circuit 7 outputs a signal delayed by the time set by the vertical position setting switch 8 on the operator panel to the tractor control circuit 9.

At the start of printing C1j, the operator sets the desired printing position on the paper 2 using the vertical direction setting switch 8 on the operator panel. Output to.

Next, the tractor control circuit 9 controls the motor 10 . A tractor 12 is driven by a motor 11.

U As described in detail of the invention, according to this embodiment, the tractor start signal given to the tractor control circuit from the print control circuit is
By delaying with two delay circuits, the printing position R1 can be easily adjusted.

[Brief explanation of the drawing]

The figure is a diagram for explaining one embodiment of a print position adjusting device according to the present invention. In the figure, 1 is a print control circuit, 2 is a video signal output circuit, 8 is an optical unit, 4 is a photosensitive drum, 5 and 7 are delay circuits, 6 and 8 are vertical position setting switches, 9 is a tractor control circuit, and 10 is a motor, 11 is a gear, 12 is a tractor, and 13 is paper.

Claims (1)

[Scope of Claims] A latent image forming medium on which a latent image is formed, an image forming means for forming a latent image on the latent image forming medium, and a medium for supplying a recording medium to the latent image forming medium. a conveying means, and a driving means for driving the medium conveying means. 1. A print position adjustment device comprising means that can vary the timing of applying a drive signal from the print control means to the drive means.