JPS59135484A - Image forming device - Google Patents

Abstract

PURPOSE:To facilitate cutting of an image formed on a recording material by reading out the image of an original or the recording material on which recording has been finished, with a reading means and cutting out the recording material in accordance with the image information. CONSTITUTION:In an image forming device for exposing an original image placed on a platen 1 to the surface of a drum 2, a one-dimensional image sensors 31, 32 consisting of photosensitive elements, such as CCD, are installed, the original image on the platen 1 is read with the sensor 30, and the image on a transfer sheet is read with the sensor 31. When a cut mode selection switch is set to an original mode, the original on the platen 1 is read with the sensor 30 and stored in a memory, and when it is set to a transfer mode, the toner image after transfer is read with the sensor 31 and stored in the memory. When the cut mode is selected, a cutting device 32 execute cutting action so as to perforate the transfer sheet in accordance with the image information stored in the memory.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus for recording an image on a recording material.

2. Description of the Related Art Conventionally, for example, a copying machine that copies an original image has been equipped with a cutting device that cuts a roll of recording paper according to the size of the original. However, this type of apparatus cannot cope with a request to cut out a partial image of a document, and in response to this request, it is necessary to manually cut the recording material after recording.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide an image forming apparatus that can easily cut out an image in which a recording month is formed.

The present invention will be further explained below using the drawings.

FIG. 1 is a sectional view of a copying machine to which the present invention is applied. In the figure, 1 is a platen that reciprocates on which a document is placed with the image side facing down, 2 is a rotatable drum with a seamless photoreceptor around its periphery, and 3 is a drum that exposes the document image on platen 1 to tram 2. 5 is a corona charger that charges the surface of the photoreceptor with a positive charge in advance, 6 is a corona charger that removes negative charge from the surface of the photoreceptor together with the exposed image, 8 is a developer that develops the electrostatic latent image, and 9 is a transfer of the developed image. A charger for transferring onto the paper 10, 11 is a container that stores a large number of transfer papers 10 and is detachable from the main body, 12 is a stand for manually feeding the transfer papers 10, 1
3 is a roller that feeds the transfer paper from the feeder, 14 is a roller that feeds the transfer paper from the manual feed table 12, 15.16 is a micro switch that detects the manual transfer paper, and 17 is the front edge of the transfer paper and the leading edge of the drum image. Registration rollers to match the
18 is a roller for separating the transfer paper from the drum, 19
20 is a belt for conveying the transfer paper, 20 is a fixing roller,
21 is a roller that discharges the transfer paper onto the tray 22; 23 is a plate cleaner that removes residual toner from the drum; 4 is a magnet roller that collects the toner removed by the blade 23; and 7 is a container that stores the toner collected by the roller 4. ,2
4 is a negative corona charger that removes the residual charge on the drum; 25 is a shank that directs the light from exposure lamp 3 onto the exposed surface of the drum for a certain period of time; and 26 and 28 are shank for directing the light from lamp 3 A mirror 27 that is applied to the drum surface is a selfoc lens that images the light reflected from the original by the lamp 3 onto the drum surface.

Reference numerals 30 and 31 denote one-dimensional image sensors consisting of photosensitive elements such as CCDs. The image sensor 30 reads the original image on the platen 2, and the image sensor 31 reads the image on the transfer paper. 32 is a cutting device for making perforations in the transfer paper discharged from the fixing roller 20.

Explain the operation. When the main switch is turned on, the motor that drives the drum 2 is turned on, the lamp 3 is turned on, the shutter 25 is opened, and at the same time, the corona charger 6 is turned on and the drum 2 is rotated. It prevents residual toner and residual charge on the drum surface in advance.

Clean memory. When the fixing roller 2o reaches a constant temperature due to the internal heater, copying is possible. When the copy inch is turned on, the shank is 25
Close the drum and rotate drum 2 again, about 1 rotation (hereafter 2nd +
After the platen 1 starts moving forward (referred to as "iij rotation"), the platen 1 starts to move forward, and the slit exposure of the original on the platen 1 starts. On the other hand, if the document mode is selected by a cutting mode selection switch to be described later, the document on the platen 1 is read by the image sensor 30, and the read image information is stored in the memory.

The reflected image of the lamp 3 is slit-exposed onto the drum through a SELFOC lens. 1': The photoreceptor of the ram 2 is composed of an insulating layer, a photoconductive layer, and a conductive layer from the surface, and when it reaches the surface charged by the charger 5 or the exposed surface, the positive charge is transferred between the negative charger 6 and the optical image. Static electricity is removed.

When that surface reaches the uniformly exposed surface, the light from the mirror 26 forms a high contrast electrostatic latent image on the drum surface. The latent image is exposed to toner in a developing area and made into a developed image. The visible image is transferred to the transfer paper by the positive potential of the transfer charger in the transfer area. One sheet of transfer paper is separated and fed from the cassette 11 by the timing operation of the paper feed roller 13, and is passed through the transfer area by the registration roller 17 at the same speed as the circumferential speed of the drum. The transfer paper after transfer is transferred to the roller 18.
The image is separated by a belt 19 and sent to a fixing roller 20 where the image is fixed.

On the other hand, if the transfer mode is selected by the cutting mode selection switch, the image sensor 31 reads the toner image on the transfer paper after transfer, and the read image information is stored in the memory.

Further, when the νj cutting mode is selected, the cutting device 32 performs a cutting operation in accordance with the read image information stored in the memory in order to make perforations in the fixed transfer paper. The transfer paper that has been fixed is transferred to the tray 22 by the roller 2.
1 is discharged.

After the transfer is completed, the tram surface is subsequently cleaned by a blade 23, static electricity is removed by a charger 24, and memory is removed by light from a lamp 3 via a mirror 28.

FIG. 2 is a Solon diagram showing one embodiment of the control circuit according to the present invention, and FIG. 3 is a diagram showing a detailed configuration example of the cutting device 32.

In FIG. 2, reference numeral 41 denotes a control section consisting of a well-known one-chip microcomputer, which performs the aforementioned copying sequence control and control of operation switches, displays, etc. 42 is a drive circuit for the cutting device 32. Reference numeral 43 corresponds to the image sensor 30 for reading the original image shown in the first figure, and 44 corresponds to the image sensor 31 for reading the transferred image shown in the first figure. 45 is a binarization circuit for binarizing the read image signal, an example of which is shown in FIG.
It consists of a comparator that compares the reference voltage ref and the input image voltage IN to determine whether the input image is black or white. 4
Reference numeral 6 denotes an image memory made of a semiconductor memory, which stores binarized image information obtained by the image sensor 43 or 44. Reference numerals 47 and 48 are cutting mode selection switches, a switch 47 is a switch for selecting an original mode that performs a cutting operation according to the original image, and a switch 48 is a switch for selecting a transfer image mode that performs a cutting operation according to a transferred image. . Incidentally, if neither of the switches 47 and 48 is operated, a normal copying operation without cutting operation is performed. 49 is a multiplexer that selects the cutting mode according to the mode selection of 7 inches.
A read signal from one of the two image sensors is selectively transmitted to the binarization circuit 45.

In FIG. 3, 50 is a laser generator, 5I is a collimator lens that converts the laser beam into a thin flat beam, 52 is a polygon mirror that rotates at a predetermined speed to scan the laser beam, and 53 is an F-θ lens that performs curvature correction. By turning on and off the laser oscillation, perforations are made in the transferred transfer paper 54 as shown in FIG. 4. 5o is a beam detector for detecting the start point of laser modulation.

FIGS. 6 and 7 are flowchart 1 showing the operation control program of the apparatus of this embodiment. This program is stored in advance in the memory ROM of the microcomputer of the control section 41.

The operation will be explained below. Note that this program is executed when any one of the cutting mode selection switches is operated.

In step 100, it is first determined whether the selected mode is the paper cutting mode, the original mode, or the transfer paper mode, and if the mode is the original mode, the multiplexer 49 is operated to take in the output of the image sensor 43, and vice versa. In the transfer paper mode, the multiplexer for receiving the output of the image sensor 44 is operated. After this, image reading is started from the leading edge of the document or transfer paper.

First, the first line image of Stella 7° lot is read and stored in the A line area of the image memory. Next step 10
2, the image of the next line is read and stored in the B line area of the image memory. Then, in steps 103 and 104, the change points (black → white or white → black) of the corresponding pixels in the A line area and the B line area stored in the memory, that is, the change points in the movement direction are detected bit by bit. If it is not a change point, the process advances to step 107 and further detection operation is performed. If it is a change point from white to black, the white portion corresponding to the change point in the A line area is stored in register 1 as a cutting point (step 106). On the other hand, if it is a change point from black to white, the white portion corresponding to the change point in the B line area is stored in the register 2 as a cutting point (step 105). In this way l
The life is detected, and when one line is completed, the process proceeds from step 107 to step 108, and it is detected whether there is a change point between adjacent bits in the reading line direction. If there is not, the process proceeds to step 110, and in step 109, the white portion corresponding to the change point is further stored in the aforementioned register l as a cutting point. When the detection for one line is completed, the cutting point stored in register l in step 111 is stored in the 9J cutting point area of the memory. Further, in step 112, the image information stored in the B line area is shifted to the A line area, and the process advances to step 102 to read the next line. In this way, the process of sequentially reading one line at a time until the final line, detecting points of change from the image of the previous line and points of change in the line direction, and determining the cutting point is repeated.

The cutting program shown in FIG. 7 is executed in accordance with the cutting point data determined by executing the program shown in FIG.

If the cutting mode is selected (step 200), the polygon mirror 52 is rotated at a predetermined speed in step 201, and a laser beam is output in step 202. Step 203
If the start point is detected by the beam detector 55 in step 204, according to the cutting point data stored in the cutting point area of the memory,
By turning the laser on and off and cutting the end of the transfer one line at a time, you can see the sewing machine 1. In this way, all lines are cut one after another, and when all lines are finished, the polycon mirror 5 is cut.
The rotation of step 2 and the laser output are stopped to complete the cutting operation.

As mentioned above, FIG. 4 shows an example of the end of transfer in which perforations are formed according to this embodiment, and the perforations are made in accordance with the letter A formed on the transfer paper.

In the embodiments described below, the present invention is applied to a copying machine, but it can also be applied to laser beam printers, inkjet printers, thermal printers, etc. that perform image forming operations based on external input signals. No image sensor is required for reading.

Further, as an image sensor, one that can detect a change point and has a fairly rough focus can be used.

Further, when applied to an apparatus that reads a document with an image sensor and forms an image using the read signal, the image sensor can be used both for image reading and change point detection. Also,
Furthermore, if the edges of the original are detected and the cutting operation is performed, recording materials of the same size can be cut to obtain copies according to the original size. Further, as a cutting device, in addition to laser light, electric discharge using a sword or the like can be used. It is also possible to detect the frame portion of a framed document and cut out the image within the frame.

As described above, according to the present invention, cutting of recording material,
This can be done automatically by the customer in accordance with the original image or the transferred image, thereby achieving two improvements in office efficiency.

Furthermore, if the cutting operation is performed according to the image on Si, kA, the present invention can also be applied to a variable magnification device.
It is effective.

[Brief explanation of drawings]

Fig. 1 is a cut-away diagram of a copying machine to which the present invention is applied, Fig. 2 is a diagram showing an example of a control circuit, Fig. 3 is a diagram showing an example of a cutting device, and Fig. 4 is a cutting diagram. FIG. 5 is a diagram showing an example of a binarization circuit, and FIG. 6 is a diagram showing the state of the finished recording material.
7 is a flowchart 1 diagram showing a control program, in which 1 is a platen, 2 is a drum, 10 is a transfer paper, and 3 is a flowchart diagram showing a control program.
0.31 is an image sensor, 32 is a cutting device, 45 is 2
The value conversion circuit 46 is an image memory. Applicant: Canon Co., Ltd.

Claims (1)

[Claims] (1) In an image forming apparatus that records an image on a recording material, there is a reading means for reading an image of a document or a recording material that has finished recording, and a cutting that cuts the recording material according to the image information read by the reading means. An image forming apparatus comprising: means. (2. The image forming apparatus according to claim (1), wherein the cutting means cuts the recording material after recording has been completed.