JPS5822739B2 - Gazokirokuseigiyohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to an image recording control device in a transfer type electrophotographic recording apparatus.

Specifically, it relates to an image recording control device that has been improved so that images can be sent to a photoreceptor in synchronization with the feeding of a recording material, and recording can be performed without misalignment of transfer onto the recording material and without page misalignment. It is.

Conventionally, various types of recording devices have been detected that transfer images formed on a photoreceptor onto a recording material, but recently, as a recording material, a folding type with holes P1 at both ends as shown in Fig. 1 is used. Alternatively, a need has arisen for a recording device that uses paper P (stock home paper) with perforations P2 for page determination, and it is being put into practical use, but various drawbacks have arisen. A solution is urgently needed.

These drawbacks include, in particular, misalignment of the transferred image due to the difference between the moving speed of the photoreceptor and the moving speed of the stock home paper, and page misalignment due to transfer position misalignment between the page of the stock home paper and the transferred image.

To summarize, generally speaking, in order to transfer an image formed on a photoreceptor onto a recording material without transfer deviation, the speed of the photoreceptor and the speed of the recording material must at least match during transfer.

Therefore, it is conceivable to transport the stock home paper while hooking it with a tractor through holes provided at both ends of the stock home paper so that the stock home paper is transported at the same speed as the outer peripheral speed of the photosensitive drum.

However, although the pitch of the holes at both ends of stock home paper must be made with high precision, in reality, the hole pitch changes due to manufacturing errors and environmental changes such as humidity and humidity.

For this reason, the speed of the stock home paper changes as much as the hole pitch changes, so it does not match the outer peripheral speed of the photosensitive drum, and the recording material slides against the photosensitive drum by the amount of deviation, resulting in deviated transfer and inconvenience. bad.

Therefore, in order to solve this problem, it is generally possible to prevent the transfer from occurring by using a system in which the recording material is fed by a roller and the speed at which the paper is fed by the roller matches the circumferential speed of the photosensitive drum.

However, while stock home paper has variations in hole pitch, it is manufactured in such a way that the relationship between perforations and holes corresponds reliably and unambiguously.

In other words, if the distance between one perforation and the next perforation is one page,
The number of holes within a page and the relative positions of the holes are always constant, and this relationship remains unchanged even if the paper expands and contracts due to temperature, humidity, etc.

If this high paper expands or contracts, the hole feed speed, that is, the page feed speed, will no longer match the drum circumferential speed, and if recording is performed at a constant speed that matches the drum rotational circumferential speed, the position within the page to be recorded will be determined. Even if the error within one page is negligible and is only four, the error will accumulate over the course of several tens of pages, eventually causing a page shift.

On the other hand, when using tractor feed, as mentioned above, if the paper expands or contracts, the paper feed speed will no longer match the circumferential speed of the drum, resulting in transfer misalignment, but the hole feed speed, that is, the page feed speed, will depend on the drum's circumferential speed. It matches the circumferential speed.

Therefore, if recording is performed at a speed commensurate with the circumferential speed of the drum, the page to be recorded and the position within that page will not be out of order.

As described above, when stock home paper is used as the recording paper, either a transferred image shift or a transferred page shift inevitably occurs depending on the method of transporting the paper, which is inconvenient for a recording apparatus.

The present invention transports the recording paper using a roller conveyance system,
Eliminates transfer misalignment due to speed differences between the photosensitive drum and the recording material. Even if the recording material expands or contracts due to manufacturing errors or environmental changes such as temperature or humidity, the recording material remains in the designated position. An object of the present invention is to provide an image recording control device that is improved so that it can record images.

An embodiment in which the image recording control apparatus of the present invention is applied to an electrophotographic recording apparatus will be described in detail below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a conventionally well-known electrophotographic photosensitive drum having a photoconductive layer, which rotates in the direction of the arrow.

In addition to this drum shape, the photoreceptor may take other shapes such as an endless belt shape.

A latent image forming means 3 including an image exposing means (in the illustrated example, a cathode ray tube opening) provided at position A is disposed on the photosensitive drum, and an electrostatic latent image is formed in response to image exposure from the cathode ray tube.

The electrostatic latent image is then developed by a developing means 4 provided at position B.

The developing method may be dry or wet.

The developed image is transferred onto the recording material by the transfer roller 5 at the C position.

On the other hand, the recording material P is a recording material such as the stock home paper shown in FIG. 1, and is folded in the storage box 6 at its perforations.

This recording material is sequentially sent out by feeding rollers 7 and 7', the developed image is transferred via transfer roller 5, the developed image is heated and fixed by heat fixing roller 8, and then transferred onto tray 10 via feeding rollers 9 and 9'. be accommodated.

To explain the drive mechanism, numerals 7 and 9 are feeding rollers that are directly driven by a drive source, and are made up of a gear 11 and a belt or chain that are concentric with the rotation axis of the photosensitive drum so that they rotate at the same outer peripheral speed as the outer peripheral speed of the photosensitive drum. Communicate through other means of communication.

On the other hand, a photoelectric detector 12 having a light source and a photoelectric conversion element PC is provided in the path of the recording material P. It is arranged to detect the hole position and pitch on one side.

S is a slit provided to improve the accuracy of hole position detection by the photoelectric detector, and this slit may be located on either the front or back side of the recording material P.

13 is a scale for setting a predetermined position on the page of the recording material.

For example, the scale position is such that the distance to the transfer position C is 0.000. The distance is set to be approximately equal to the distance from the F and T tube position A to the transfer position C.

This restriction is such that the developed image on the photosensitive drum arrives when the perforation of the recording material P reaches the transfer position C, and then the predetermined printing start point of that page reaches the transfer position, and then continuous transfer is performed. This is determined based on the need to adjust the feeding of the recording material and the image exposure on the photosensitive drum.

The position of the scale 13 is optimal at point D as shown in the illustrated example in order to minimize the cumulative error in the length of the recording material P and to avoid unnecessary non-printing parts. It may be point F or point 0, which is moved along recording material P from point D by an integral multiple of the distance between the perforations of P, that is, the length of one page.

On the other hand, it is assumed that the slit S is placed at a point E that coincides with the hole position when the predetermined position of the recording material P is set on the scale 13.

This position E is also preferably set near the scale position in order to minimize the cumulative error of the recording material, but if the error is within the allowable range, it may also be set at a position moved along the recording material P by an integral multiple of the hole pitch. All that is required is that there be a predetermined relationship with the scale position.

For example, it is not always necessary that the position of the slit S coincides with the position of the hole at the beginning of paper feeding.

When starting the operation of this apparatus, first, the predetermined position of the page of the recording material P is aligned with the scale 13.

This position is then detected by the photoelectric detector 12.

After the predetermined position is detected, the first pulse signal is generated from the recording start pulse generation circuit.

The start of image exposure from the cathode ray tube 2 due to the generation of the pulse signal from the recording start pulse generation circuit 14 is performed when the recording material P is positioned by the scale 13 from the perforation which is the first position of the page of the recording material P to the transfer position C. If the distance is made to match the distance from the cathode ray tube position A to the transfer position C, it is necessary to delay the distance from the perforation position to the print start position, and from the print start position of the recording material P to the transfer position C.
When the distance from the cathode ray tube position A to the transfer position C is made the same, the printing start position of the recording material P is detected at the same time.

The pulse generated at step 14 is used by a synchronizing signal generator 15 to generate a synchronizing signal for horizontal and vertical deflection of the cathode ray tube 2 and a synchronizing signal for determining the timing of character generation. - generate synchronization signals corresponding to the number of scan lines required for a page;

(During this time, the photoelectric detector 12 detects when and how many holes have passed as the recording material P moves, and transmits the detected information to the recording start pulse generation circuit 14.

) After the synchronization signal generating circuit 15 generates a synchronization signal for one page, it waits until the next pulse from the circuit 14 arrives.

The recording start pulse generating circuit 14 mainly consists of a known pulse counter, and generates a pulse signal after counting the number of holes for -pages.

Then, in response to this signal pulse, the synchronization signal generating circuit 15 again generates a synchronization signal for one page.

As described above, in this device, pulses are sent from the recording start pulse generation circuit 14 so that each page is recorded at a predetermined position of each member, so no transfer position shift occurs, and therefore, page shift is completely eliminated. .

Note that the synchronization signal started by the pulse from the recording start pulse generation circuit 14 may be generated independently of the rotation of the drum if the rotation of the drum is stable, but the rotation of the photosensitive drum 1 is not very stable. In this case, control may be performed using appropriate timing pulses generated from the photosensitive drum so that a predetermined recording is made at a predetermined position within one page.

The deflection circuit 16 receives the synchronization signal and generates horizontal and vertical deflection signals, and drives the deflector 17 by 1 to deflect the electron beam of the cathode ray tube 2.

For example, in the case of facsimile scanning, a horizontal scanning deflection signal may be generated to cause the electron beam of the cathode ray tube 2 to perform line scanning.

Meanwhile, the synchronization signal is also applied to a known character generator 18,
It controls the generation point of characters to be recorded and generates character signals.

Character signals from the character generator 18 (not only character signals but also image signals are applied).

) is added to the brightness modulation circuit 19, and the electron beam of the cathode ray tube 2 is subjected to brightness modulation by the brightness modulation circuit 19, so that A
Image exposure is performed on the photosensitive drum at the point.

As explained in detail above, in the present invention, the timing for sending image information for one page of recording material onto the photosensitive drum is electrically corrected for each page of recording material. Errors due to expansion and contraction of the recording material are limited to within one page and are not accumulated.

Further, it shows remarkable effects such as no transfer deviation occurring at all.

In the examples, an example was explained in which a cathode ray tube was used to impart image information on an electrophotographic photosensitive drum. It is clear that the electrographic method is equally applicable to the present invention.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a recording material applied to a transfer type electrophotographic recording device to which the image recording control method of the present invention is applied, and FIG.
The figure shows an embodiment of an electrophotographic recording apparatus to which the image recording control apparatus of the present invention is applied. In the figure, 1 is a photosensitive drum, 2 is a cathode ray tube, 3 is an electrostatic latent image forming means, 4 is a developing means, 5 is a transfer roller, 6
1 is a storage box, 7 and 9 are feeding rollers, 8 is a heat fixing roller, and 10 is a tray.

Claims (1)

[Scope of Claims] An image recording control device that controls recording of an image on a photoreceptor in a predetermined area within a predetermined section of a recording material that is divided into one predetermined section, connected, and continuously conveyed, a detection means for detecting the movement position of the recording material divided into each of the certain sections; and an image forming leg that applies image information for each of the certain sections onto the photoconductor in response to the detection means. and a roller-type conveying means for conveying the recording material at a constant speed that matches the circumferential speed of the photoreceptor, and the detecting means detects a predetermined position of the recording material at each fixed interval and determines the distribution of the recording material. An image recording control device characterized in that the timing of adding the image information is corrected for each fixed interval.