JPH012955A - Manuscript handling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a document handling device that is added to an image forming apparatus such as a copying machine or a laser beam printer and feeds a document to a predetermined position of the image forming apparatus.

(b) Prior art-a, in an image forming apparatus such as a copying machine, a document handling device (hereinafter referred to as D) that feeds a document to a predetermined position such as an exposure position
(referred to as F) may be added and used.

Incidentally, in recent years, new functions have been added to image forming apparatuses that allow a user to specify a certain area of a document and extract or extract only the specified area to form a copy. Methods for specifying the area include a method of inputting XY coordinates, and a method of inputting with a digitizer device used especially when accuracy is required. When using tgj to transport a document using a DF for an image forming apparatus having such a function, the problem is how to improve the stopping accuracy. In particular, when specifying an area using a digitizer, no matter how accurately the operator sets the coordinates, if the position of the document stopped by the DF shifts, the image will shift when it is formed, resulting in poor copy quality. Stopping accuracy is especially important since the stopper may drop.

Therefore, as a method of stopping the original at a predetermined position when transporting the original using a DF, conventionally a) a collar that can be retracted from the original is provided at a predetermined position, and the original is stopped by hitting this stopper. .

b. An encoder is attached to the document feeding motor, and the pulses of the encoder are counted from a predetermined reference position for detecting the document, and after counting a certain number of pulses, the feeding motor is braked and stopped.

This method was used.

→ Problems to be Solved by the Invention However, method a above has disadvantages in that it is mechanically complex and expensive to manufacture, and that high-speed operation is not possible because it buckles when used with thin originals. have. In addition, method b has the disadvantage that the stopping accuracy always fluctuates by the pulse pitch of the encoder, and if the pitch of the encoder is made small in order to suppress the fluctuation, when high-speed operation is performed, the sample leg processing will not be completed in time and the error will increase ( There was a problem with this.

(5) Means for solving the problem The present invention aims to solve the above-mentioned problems, especially the problem of method b, by frequency-dividing the clock generated by the clock generation means interlocked with the transport means. a frequency dividing means; a speed switching means for switching the document conveying speed of the conveying means;
The present invention is characterized in that it is provided with a control section that selectively operates and controls the frequency dividing means and the speed switching means according to the conveyance state of the document.

By adopting the above-mentioned means, especially highly accurate stop positioning is required.
．． f First, the document feeding speed of the conveying means based on the speed switching means is set to a high speed, and the dividing means is activated to detect the size of the document placed on the document placing portion tζ while conveying it. After detecting the size, the control unit 1 enters control to stop the original at a predetermined position, and the speed switching means switches the original m feeding speed of the transporting means to a low speed, and the separation means is deactivated to perform a precise stopping point. Perform position control. On the other hand, when feeding N documents for which high precision is not required, the DF control section sets the document feeding speed of the conveying means to high speed using the speed switching means, and then operates the frequency dividing means. Performs all stop control and achieves high-speed positioning.

(F) Examples Examples of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment in which a document handling device (DF) 1 of the present invention is installed in a copying machine 100. 2 in the diagram
1 is an entrance tray corresponding to a document loading section on which 8W sheet documents are placed, and the sheet document I.mu.3 is placed on the artificial tray 2 with the lower side in the figure facing up. The first document detection DF input sensor 4 is a reflective sensor that detects the leading and trailing edges of the sheet document, and the feed rollers 5 and 6 press against each other to sandwich and convey the sheet document. 7 is the original brush glass 1
This is a stopper that prevents feeding onto the DF 2, and is released by the operation of the DF-input lost collar solenoid 21 to enable feeding. ! ? The entire belt 9 constituting the feeding means is connected to the sea 1-
It is an endless belt with a width large enough to cover the entire surface of the original, and the surface has a sufficient friction coefficient to allow the original to slide over the original glass 12 using frictional force. It is hung on roller 11,
The entire surface belt 9 and the driving roller 10 are designed to prevent slippage.The original 3 is conveyed by the entire surface belt 9, guided by the flapper 30, and ejected from the original glass 12. The document is stopped when the leading edge of the document is detected by the DF output sensor 15, which is a reflective sensor provided.Next, the entire surface is rotated in the opposite direction, and after the DF output sensor 15 detects the trailing edge of the document,
When the original FJl 13 arrives at a predetermined exposure position, it stops.

On the other hand, a well-known digitizer 26 is mounted on the top of the DF of the present invention, and a digitizer cover 27 covering the entire surface of the digitizer is mounted on top.

As shown schematically in FIG. SW) 51.The planar resistor 50 is located not only under the sheet on which the original is placed, but also under keys such as the clear key 52, the registration key 53, and the continuous designation key 54, which will be described later. A voltage is output according to the position set by the pen SW, and read as the setting value of the area or the above-mentioned key.

The operator places the document face up on the resistor 50, and
Set it to fit the top corner. Then, two points in the area specified with the pen SW51, for example, A, A' point or (from B'
By pressing the dots, the area A - B' - A' - B - A is specified, and by pressing the registration key 53 described later with the pen SW, the area specification is set. For example, when copying, 1-rimming function or image conversion The function works and a copy is output as shown in Figure 2 (bl).

In addition, there is a digitizer paper feed slot in the upper right corner of this DF that feeds the document on the digitizer. At the digitizer paper feed port, there is a digitizer entrance detection sensor 22 that detects the document stacked on the digitizer surface.
A reflective sensor is used. The feed rollers 23 and 24 press against each other to sandwich and convey the sheet original. A stopper 25 prevents the document from being fed from the digitizer paper feed port onto the platen glass, and is released by the operation of the digitizer inlet stopper solenoid 29 to enable feeding. The document sent out from the digitizer paper feed port by transport rollers 23 and 24 is sent along a guide plate and sent onto the platen glass from the right end of the aforementioned full-surface belt.

All rollers and full-surface belts are driven by a motor 19 whose rotational speed can be switched between high and low speeds by a speed switching means, which will be described later.The motor 19 is composed of a circular disk and a sensor that generates clock pulses when it rotates. A clock generating means 20 is provided, and the operation of the DF is controlled by this clock. Also, when stopping at a predetermined position on the glass 12, turn off the motor 19 and at the same time turn on the brake 31 to ensure stopping. After the exposure operation is completed, the document sent out by the turn roller 11 and the full-surface belt 7 is reversed by the paper ejection flapper 30, and is ejected by the paper ejection rollers 16 and 17 which are in pressure contact with each other, and is sequentially loaded onto the digitizer cover mentioned above. .

Next, the configuration of the copying apparatus 100 will be explained.

103 is an illumination lamp (exposure lamp) that illuminates the original;
05. 107 and 109 are scanning reflecting mirrors (scanning mirrors) that change the optical path of the reflected light from the original height, 111 is a lens with focusing and variable functions, and 113 is a fourth reflecting mirror that changes the optical path. (scanning mirror). 115
1 is an optical system motor that drives the optical system, and 117 and 121 are sensors, respectively.

131 is a photosensitive drum, 133 is a main motor that drives the photosensitive drum 131, 135 is a high voltage unit, 137 is a blank exposure unit, 139 is a developing device, 141 is a transfer charger, 143 is a separation charger, and 145 is a cleaning device. be.

151 is the upper cassette, 153 is the lower cassette, 155
157 is a paper feed roller, and 159 is a registration roller. Further, 161 is a conveyor belt that transports the recording paper on which an image has been recorded to the fixing side, 163 is a fixing device that fixes the recording paper that has been slowly fed by thermocompression bonding, and 167 is a sensor used for double-sided recording.

The surface of the photosensitive drum 131 described above is made of a seamless photoconductor using a photoconductor and an electric conductor. The motor 133 starts rotating in the direction of the arrow in the figure. Next, when the predetermined rotational control and potential control processing (preprocessing) of the drum 131 are completed, the original Tn placed on the document table glass 101 is illuminated by the illumination lamp 103 configured integrally with the first scanning mirror 105. , the original reflected light is transmitted to the first scanning mirror 105, the second scanning mirror 107, the third scanning mirror 109, and the lens 1.
11, and the drum 131 via the fourth scanning mirror 113.
image on top.

The drum 131 is corona charged by the high pressure unit I-135. Thereafter, the image (original image) irradiated by the illumination lamp 103 is exposed to slit light, and an electrostatic latent image is formed on the drum 131 using a known NP method.

Next, the electrostatic latent image on the photosensitive drum 131 (the developing device 13
9 is developed and visualized as a toner image, and the toner image is transferred onto transfer paper by a transfer charger 141 as described later.

That is, -F stage cassette 151 or lower stage cassette 1
The transfer paper in ~153 is transferred to the paper feed roller 155 or 15.
7 into the main unit, and is sent toward the photosensitive drum 131 with accurate timing by registration rollers 159, so that the leading edge of the latent image and the leading edge of the transfer paper are aligned. Thereafter, the transfer paper passes between the transfer charger 141 and the drum 131, so that the toner image on the drum 1311 is transferred onto the transfer paper. After this transfer is completed, the transfer paper is separated from the drum 131 by a separation charger 143, guided to a fixing device 163 by a conveying belt 161, fixed by pressure and heat, and then sent out of the main body 100 by an ejection roller 165. Get ejected.

After the transfer, the drum 131 continues to rotate, and its surface is cleaned by a cleaning device 145 comprising a cleaning roller and an elastic brush.

Next, the configuration of the control section 40 of this apparatus will be explained based on the block diagram shown in FIG. Controller 41 in the figure
is a well-known microcomputer, and has an internal RO
RAM Ilo is accessed by a program stored in M. First, the output signal to the DF section is sent via the driver 42 to each of the aforementioned loads, namely the DF input lost, buckle solenoid 21, digitizer inlet stop solenoid 29, and brake 3IQON10FF, and the speed switching means 43 (from this to the E shift motor 19). is rotated forward and reverse in two stages of high-speed and low-speed modes.Input signals include the aforementioned sensors, namely the DF input roller sensor 4 and the DF output roller sensor 15.
When the number 43 of the digitizer population sensor 22 is inputted via the buffer 44, the clock pulse generated by the clock generating means 20 is divided into 1/2 as 1ntI and as 1nt2 by the frequency dividing means 45. Please enter it in the correct form. Further, the output signal to the copying apparatus 100 is transmitted via the driver 46 to the various loads mentioned above, including the blank exposure unit 137, the main motor 133, the optical system motor 115, the illumination lamp 103, and the paper feed roller 155.
7, I,',; Storer 159 eONlo F F
do. The input signals of the aforementioned sensors, namely the home position sensor IJ7 and the image tip sensor 121, are inputted via the buffer 47.Furthermore, the digitizer section 26 outputs the voltage applied to the digitizer electrode as an output signal. A switching X/Y application switching signal is output, and the X-axis application is switched at "L" and the Y-axis application is switched at "H".The input signal is the lead pen signal generated when the lead pen switch 51 is pressed to the digitizer electrode surface, and There is an X-axis input voltage signal and a Y-axis input voltage signal that input analog signals in the X/Y-axis directions, which are output depending on the pressed position.

The present embodiment has the above-mentioned configuration, and its operation will now be explained along the flowcharts of FIGS. 4 and 5.

When precise copying is performed by specifying an area using the digitizer 26, the flow similar to that shown in FIG. The feed roller 2 is configured to be detected by the digitizer entrance sensor 22 of the DPI.
3 and 24 (F2) and presses the copy key to start document conveyance (F3). Then, the motor 19 rotates forward at a high speed of about 400 mm/s, the operation of the lost solenoid 29 with detarizer is released (F4), the original is transported, and at the same time the controller is activated to detect the original size in the transport direction. ) The count of the size detection counter built in the roller 41 is started at the 1nt2 input clock passed through the frequency dividing means 45, that is, the clock pulse is divided by 172 (F5). In this device, the amount of document advance per one clock pulse is set to 0.025ffIIll, and by dividing this pulse by 172, the amount of advance per one clock at this time is 0.5 ms. Counting is performed until the document comes out from the digitizer population sensor 22 (F6), and the size of the document is determined from the data (F7), while the digitizer input lost flange solenoid 29 is turned off (F8) in preparation for the next document. The conveyance means 8 carries out high-speed conveyance until the document once passes the glass surface 12 and the leading edge reaches the exit sensor 15 (F9).
After arriving, the transport is switched to a low speed of about 200 mm/s and reversed (FIO). Then, the timing at which the document comes out from the exit sensor 15 is grasped (Fll), and from that point on, the count of the stop counter built in the controller 41 to stop the document at a predetermined position on the glass surface 12 is controlled by an input clock of int 1, that is, 1 clock. This is done by a clock of 0.25 mm per document advance fi (
F12).

Then, when the stop counter reaches the predetermined value (F13)
Turn off the motor 19 and at the same time turn on the brush key 31 to stop the document at a predetermined position (F14), but at this time, control is performed by the amount of advance of the 025 cylinder per clock, so there is no error in stopping the document. If so, it will fall within 025III1. Then, the control unit 40 selects a copy sheet based on the above-mentioned document size data and starts a copying operation (F15).

Here, the reason why control using 1 ntl is performed after entering the low speed transport mode is explained. When controlling using int 2 in high speed mode, the interval of 1 clock is 0. ”；wm÷
400 +++++ a / 5ec = 1.25 m s
ec, but when controlling by 1nt1, 0.25 m÷400w/5ec=625 m s
It becomes ec. Since this device is controlled by software control using a microcomputer, there is a limit to its processing speed, and the interval of one clock is 625m5ec.
If this happens, the processing speed will not be able to keep up.

On the other hand, when running in low speed mode, 025 torso ÷ 200 m
/ see =1, 25 m sec, and if one pulse has this interval, control is possible.

Next, the operation when performing normal copying that does not require high accuracy will be explained along the flowchart of FIG. 5. In this case, when the operator places the original on the DPI entrance tray 2 and presses the copy key (F21) when the DF human sensor 4 is detected (F20), mode 19 starts rotating in high speed mode and The DF input lost collar solenoid 21 is released (F22), and at the same time the input clock is frequency-divided.
The signal of nt2 is sent to the size detection counter (F23
). While the size detection counter detects the document (F24), the document size is determined from the counted clock number (F25), while the DF input lost flange solenoid 21 is turned off to prepare for the next document. (F
26). The conveyance means 8 (the document passes through the glass surface 12 and is conveyed until the leading edge reaches the exit sensor 15 (F27), and after reaching the document is reversed, but at this time, the speed remains in the high speed mode and the speed does not change (F28) ).Then, grasp the timing when the document comes out from the exit sensor 15 (F29
), and from that point on, the stop counter is counted based on the same (1nt2 input clock) in order to stop at a predetermined position on the glass surface 12 (F30).Subsequently, when the stop counter reaches a predetermined value (F31) ) Turn off the motor 19 and at the same time turn on the brake 31 to stop the document at a predetermined position (F32), select a copy sheet based on the size data mentioned above, and start the copying operation (F33).

In this mode, the stopping error of original b1 is 0.5m+ at most since control is performed by the document advancing amount of 0.5m per clock, but high-speed operation is expected since all of the documents are transported at high speed. Be able to do that.

In the above embodiment, when the digitizer 26 is used, the low speed switching in the transport mode is performed by F9 immediately after the exit sensor 15 detects the leading edge of the document.
The process may be performed after the Fll original passes through the exit sensor 15. Further, although the document size detection at F6 is carried out using high-speed conveyance and an input mode of 1nt2, it may be carried out using low-speed conveyance and an input mode of int1 only when this document size is detected.

(G) As described in detail, according to the present invention, there is provided a frequency dividing means for dividing the clock generated by the clock generating means linked to the conveying means, and a speed switching means for switching the original \IAm feed rate of the conveying means. Since the document handling device is provided with a control section that selectively operates and controls the frequency dividing means and the speed switching means according to the conveying state of the document, the document handling device operates at high speed during normal document handling. Even when accurate handling of the original is required, precise positioning can be performed without increasing the operation time too much.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment in which a document handling device according to the present invention is installed in an image forming apparatus, FIG. 2 tar is a plan view of a digitizer device, and FIG. An explanatory diagram, FIG. 3 is a circuit diagram of the control unit, and FIGS. 4 and 5 are flowcharts showing the operation of the document handling device according to the present invention. 1... Document handling Apparatus, 3. Original document, 9 Transport means, 19. Morph, 20. Clock generation means, 26. Digitizer, 40 Control unit,
43 Speed switching means, 45... Frequency dividing means,
100... Image forming device (copying device).

Claims (2)

[Claims] (1) In a document handling device that includes a placing section on which a document is placed, a conveying means for conveying the document from the placing section to a predetermined position, and a clock generating means for generating a clock in conjunction with the conveying means. , a frequency dividing means for dividing the frequency of the clock generated by the clock generating means; a speed switching means for switching the document conveyance speed of the conveying means; and a frequency dividing means and the speed switching means selectively operating according to the conveying state of the document. A document handling device characterized by comprising: a control unit that operates and controls the document handling device; (2) The speed switching means is configured to switch the document conveyance speed between two stages, high speed and low speed, and the control section does not use the clock frequency dividing means and switches the speed when controlling the document to stop at a predetermined position. Control is performed by setting the means to the low speed side,
2. The document handling apparatus according to claim 1, wherein control is performed by using a clock frequency dividing means and by setting the speed switching means to a high speed side during other times when the document is being conveyed.