JPH0649011Y2 - Image recording controller for digital copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a digital copying apparatus that suppresses the occurrence of skew and misregistration of the lead and side registration of image recording even when the recording paper is displaced from the normal position. The present invention relates to a machine image recording control device.

[Conventional technology]

As a registration mechanism in a conventional digital copying machine, for example, there is one shown in FIG. This registration mechanism includes a skewed roller 20 that feeds the recording sheet obliquely forward to correct skew and side registration, and a skewed and side portion that supports one end of the recording sheet sent by the skewed roller 20. A skew / side registration correction wall 21 that corrects the registration, a sensor 22 that detects the recording paper, a registration roll 23 that adjusts the feeding timing of the recording paper, and a lead registration signal based on the signal from the sensor 22. Is generated to drive the registration roll 23 and send the recording paper toward the photosensitive drum 25 at a predetermined timing.

In the above structure, the recording paper is fed obliquely forward by the skewed roller, and is fed with one end thereof supported by the skew / side registration correction wall 21. At this point, the recording paper is kept in its posture parallel to the skew side registration correction wall 21,
Skew correction and side registration correction are performed. Next, when the sensor 22 detects the passage of the recording paper, the CPU 24 calculates the timing of the feeding, and the lead registration signal is sent to the registration roll 23. The registration roll 24 stands still or rotates according to the lead registration signal, sends the recording paper to the drum 25 at a predetermined timing, and the image recording without registration deviation and skew is performed on the recording paper.

[Problems to be solved by the invention]

However, according to the conventional registration mechanism, since the misregistration and skew of the lead and the side are suppressed by the conveyance timing of the recording paper and the attitude control thereof, the recording paper type (thickness, etc.),
There is a limit in improving the accuracy of registration due to variations in registration due to size and the like.

[Means for solving problems]

The present invention has been made in view of the above, and in order to eliminate the variation in registration due to the type, size, etc. of recording paper and improve its accuracy, a lead sensor for detecting the leading edge of recording paper, and an edge of recording paper. Detecting means for detecting the displacement of the recording paper from the normal position and outputting a displacement signal, and the timing of image recording and the coordinate conversion amount of the image are calculated based on the displacement. The present invention provides an image recording control device for a digital copying machine, which is provided with a calculating means for controlling the image recording and a control means for controlling image recording based on the calculation result of the calculating means. Here, as the image recording timing, for example, the exposure timing of the photosensitive drum is controlled in the laser copying machine, the driving timing thereof is controlled in the thermal head printer, and the coordinate conversion of the image is performed at a certain point, for example, the coordinate around the origin. There are rotation, X-axis or Y-axis movement, and the like.

The image recording control device for a digital copying machine according to the present invention will be described in detail below.

〔Example〕

 FIG. 1 shows an embodiment of the present invention.

The image recording control device for a laser copying machine according to this embodiment has sensors 1 and 2 for detecting the leading edge of a recording sheet, a long image sensor 3 for detecting an edge of the recording sheet, the sensors 1 and 2 and a long image sensor. CP that determines the orientation of the recording paper based on the signal from 3 and controls the image formation timing by calculating the coordinate conversion amount and exposure timing
U4, a memory 5 that stores image information in which an original image is processed according to a coordinate conversion amount based on the calculation of the CPU 4, a laser oscillator 6 that emits a laser beam, and polarizers 7 and 9,
A laser beam modulator 8 that modulates a laser beam according to the image information in the memory 5, a polygon mirror 10 that reflects the laser beam, an exposure fθ lens 11, and an electrostatic latent image according to the image information are formed. The photosensitive drum 12 is provided.

In the above structure, when the recording paper is sent, the recording paper is detected by the sensor 1, the sensor 2 and the long image sensor 3, and the respective detection signals are sent to the CPU 4. CP
U4 sets the read registration from the average value of the timings of the detection signal of the sensor 1 and the detection signal of the sensor 2, and calculates the skew value from the timing difference between the detection signal of the sensor 1 and the detection signal of the sensor 2. Further, the side registration is set based on the detection signal of the long image sensor 3. The CPU 4 obtains the exposure timing from the lead registration, the rotation angle of the image from the skew, the shift amount in the line direction from the side registration, and the coordinate rotation of the image information in the memory 5, the X-axis movement (horizontal movement), etc. Make a correction. The laser beam emitted from the laser oscillator 6 passes through the polarizer 7 and is then modulated by the laser beam modulator 8 according to the image information for which the lead registration and side registration of the memory 5 have been corrected, and the polarized light is polarized. Go through child 9, polygon mirror
It is reflected by 10 and reaches the outer peripheral surface of the photosensitive drum 12 through the fθ lens 11 to form an electrostatic latent image thereon. At this point, the electrostatic latent image on the photosensitive drum has been corrected for lead registration, skew, and side registration according to the recording paper. After being developed by a developing machine (not shown), it is sent. The operation is completed by transferring the received recording paper.

Although the skewed roll, the skew / side registration correction wall, the resist roll, and the like are not described in this embodiment, they can be used in combination with these conventional registration mechanisms.

[Effect of device]

As described above, according to the image recording control device for a digital copying machine of the present invention, the timing of image recording is detected by detecting the displacement of the recording paper from the normal position (the position not accompanied by the skew with registration). Since the amount of coordinate conversion of the image is calculated and the image is recorded, there is no variation in registration due to the type and size of the recording paper, there is no skew, and image registration can be performed with high accuracy. it can.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention. FIG. 2 is an explanatory view showing a conventional registration mechanism. 1 ... Sensor, 2 ... Sensor 3 ... Long image sensor 4 ... CPU, 5 ... Memory 6 ... Laser oscillator, 7 ... Polarizer 8 ... Laser beam adjuster 9 ... Polarizer, 10 …… Polygon mirror 11 …… Lens, 12 …… Photosensitive drum 20 …… Skewed roll 21 …… Skew / side registration correction wall 22 …… Sensor 23 …… Registration roll 24 …… CPU 25 …… Photosensitive drum

Claims (1)

[Scope of utility model registration request] 1. An image recording control device for a digital copying machine, which corrects misalignment between lead and side registration of image recording and skew which occur due to displacement of the recording paper from a normal position, The recording paper is composed of a pair of read sensors arranged in the width direction with an interval smaller than the width to detect the leading end of the recording paper, and a long image sensor to detect the edge of the recording paper. Detecting means for detecting the displacement from the normal position and outputting a displacement signal, calculating means for calculating the image recording timing and the image coordinate conversion amount based on the displacement, and based on the calculation result of the calculating means An image recording control device for a digital copying machine, characterized in that a control means for controlling image recording is provided.