JP2584496B2 - Diazo copying machine and copying method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diad copying machine and a copying method, and more particularly, to a diazo copying machine in which copying is performed at an exposure speed automatically adjusted according to a document to be copied, and a copying machine. It is about the method.

2. Description of the Related Art There is a diazo copying machine in which a transmittance sensor for a document is provided in the middle of a conveyance path, and an exposure speed is automatically adjusted based on detection data of the sensor to perform continuous copying.

When copying is performed by such an automatic exposure type copying machine, until the exposure of an arbitrary N-th document is completed, the operation unit display panel merely indicates that the document is being exposed.
When the (N + 1) th original is inserted during the exposure of the Nth original, copying is performed under the same exposure conditions, that is, at the same speed as the exposure speed of the Nth original. This is because, if the exposure speed is changed to the (N + 1) th original during the exposure of the Nth original, so-called unevenness is produced on the Nth copy paper.

However, such a conventional diazo copying machine overlooks the indication that the document is being exposed, or inserts it during the exposure because it is determined that the originals have the same transmittance and the same type, but the transmittance is actually very high. If there is, there is a problem that proper copying cannot be performed.

If it is determined that the (N + 1) th original is clearly different from the (N) th original, it is necessary to wait until the exposure of the (N) th original is completed and insert the (N + 1) th original. There was grace.

(Object) It is therefore an object of the present invention to provide a diazo copying machine and a copying method capable of easily and properly copying different types of originals.

(Structure) In order to achieve the above object, the present invention provides a stop means for stopping the conveyance of the polymer of the original and the photosensitive paper in the conveyance path before the exposure unit, and has a transmittance different from that of the original in the previous copying. When changing the exposure speed by inserting a document,
When there is a polymer of the currently exposed document and the photosensitive paper, the polymer of the next document and the photosensitive paper is stopped by the stopping means. After changing the exposure speed to an exposure speed corresponding to the stopped original, feeding the polymer of the stopped original and photosensitive paper to the exposure unit, and a copying method, A copying method using a diazo copying machine, which has a sensor for detecting the transmittance of the original in a conveyance path of the original to be copied, and performs copying at an exposure speed automatically adjusted based on data detected by the sensor, When the exposure speed should be automatically adjusted by inserting the document to be copied, and when there is a polymer of the current document and photosensitive paper, the polymer of the next document and photosensitive paper is Wait in front and copy Of after completion of exposure of the polymer, after changing the exposure rate of the exposed portion in the exposure speed corresponding to the document in the standby, characterized in that feeding the polymer in the standby to the exposure unit.

Hereinafter, a specific description will be given based on an embodiment of the present invention.

In FIG. 1, when a document G is inserted from a document inlet 1, the document G is transported by a document transport roller 2. Then, the photosensitive paper K from the upper cassette 10 or the lower cassette 11 is detected by the original insertion sensor 3.
Is started from the photosensitive paper supply unit 7 at a proper timing, and is superposed on the common conveyance path 12.

The exposure unit 6 downstream of the common transport path 12 is configured to rotate a cylinder glass provided with a fluorescent lamp inside and a belt together with the belt. The exposure speed can be adjusted by changing the rotation speed. .

When the original is transported, the transmittance of the original is measured by the transmittance sensor 4 provided on the original transport path 13 and downstream of the original insertion sensor 3, and it is determined that the exposure speed needs to be changed. The exposure speed is changed to match the original transmittance, but not immediately after the measurement.

The microcomputer determines whether there is a polymer between the document currently being exposed and the photosensitive paper by a microcomputer.If a polymer between the document being exposed and the photosensitive paper is present in the exposure section, the polymer on the common transport path 12 is stopped. By lowering the stopper 5 as a means on the conveying path to close the path and disengaging the clutch of the original conveying roller 2, the polymer of the original G and the photosensitive paper K is prevented from being sent to the exposure unit 6. That is, the polymerization of the original G and the photosensitive paper K is stopped at the position of the stopper 5.

Then, after waiting for the end of the previous exposure of the polymer of the original and the photosensitive paper, the exposure speed is changed and the stopper 5 is raised. At the same time, the clutch of the original transport roller 2 is engaged, and the polymer of the original and the photosensitive paper is exposed. Send it to 6.

If the previous original has been exposed, the original insertion sensor 3 detects the leading end of the original, conveys it for a predetermined set pulse, and then lowers the stopper 5 to correct the leading end deviation between the original and the photosensitive paper. 5 to open the passage and expose
Send to

The stopper 5 is driven by, for example, a solenoid mechanism shown in FIG. That is, the stopper 5 is connected to the solenoid SO
L swings around the fulcrum O to open and close the transport path.

 Next, a description will be given with reference to a flowchart.

FIG. 3 shows a main routine, FIGS. 4 to 10 show automatic exposure calculation, and FIGS. 11 to 15 show a subroutine for exposure speed adjustment.

In FIG. 4, it is determined in step n1 whether or not the automatic exposure mode is set, and in step n2, the presence or absence of insertion of a document is checked. At step n3, parameters are set, and the routine proceeds to the subroutine of FIG.

In FIG. 5, a process related to transmittance measurement is controlled in step n4.

If it is "AE0", it is processed according to FIG. 6, and if it is "AE1", it is processed according to FIG.

In the flowchart of FIG. 7, data of the transmittance sensor 4 when there is no original is taken in step n5. And step
Since AE2 is set in n5, the process proceeds to the flowchart of FIG.

In FIG. 8, it is determined in step n6 whether the timer has exceeded t1. This eliminates edge detection,
This is for detecting the central portion of the document after transporting the document for a predetermined time after passing through the document insertion sensor 3.

In step n7, the detection is performed within t2 in order to perform detection before the trailing edge of the document passes.

Thus, in steps n6 and n7, the data of the transmittance sensor 4 at the central portion of the document set in advance is sampled,
In steps n8 and n9, the maximum value of the transmission amount data is stored in a buffer. Then, when the trailing edge of the document comes off the transmittance sensor 4,
The process moves to the flowchart in FIG. 9 as 3.

In FIG. 9, at step n10, a trigger is applied from the time of document detection by the document insertion sensor 3 to check in which process the document and the photosensitive paper are in the pulse count. Presence or absence can be determined. Therefore, if it is determined that exposure is being performed, the difference between the transmittance of the current document and the transmittance of the previous document is checked in step n11, and if the transmittance exceeds a predetermined value α, the current document feed is stopped.

If it is determined in step n10 that the previous document is not being exposed, the flow shifts to the flowchart of FIG.

In FIG. 10, it is checked in step n12 whether the original and the photosensitive paper are stopped. If not stopped, the flow returns to the reference state in step n13. If the document is not stopped, it is determined in step n14 whether or not the exposure of the previous document and the photosensitive paper has been completed.
The transfer of the photosensitive paper starts. Also, set the AE counter to "0",
Turn on the speed enable flag.

Next, adjustment of the exposure speed will be described with reference to FIGS.

In FIG. 11, if it is determined in step n16 that the AE mode (described later) is set, it is determined in step n17 whether or not the speed enable flag is on. If it is on, the process proceeds to step n18 in FIG. 14 as DM1.

In step n18, the transmittance is calculated from the original non-transmission amount and the maximum value data acquired in the automatic exposure routine, and an appropriate exposure speed is determined. Then, in step n19, the density adjustment,
Correct the control value in the CPU to the appropriate exposure speed by correcting the photosensitive paper sensitivity, the fluorescent lamp for exposure, etc., and set it to DM2.

Then, the process proceeds to step n20 in FIG. 15, where the exposure speed is actually set to an appropriate value.

Thus, in this example, when continuous copying is performed by automatic exposure, only when a different type of original is inserted, the polymer of the original and the photosensitive paper is stopped before the exposure unit, and the original being exposed and the photosensitive paper are stopped. After the completion of the exposure of the polymer, the exposure speed is changed to an exposure speed corresponding to a different type of original, and then transported and exposed. When the same type of original is inserted, the original is conveyed and exposed at the same speed.

Therefore, in the case of continuous copying of originals of the same type,
The productivity does not decrease, the display during exposure is overlooked, or the document is inserted continuously because it is determined to be the same type of document, but copying failure due to the different type of document can be avoided.

Next, a diazo copying machine suitable for carrying out the present invention will be described.

In FIG. 16, A4 size photosensitive paper is loaded in the cassette 20 above the photosensitive paper storage unit, and A3 size photosensitive paper is loaded in the lower cassette 21.

First, when the power switch (not shown) is turned on, the 17th
The display 210 ("Omachisachi") on the operation unit display panel shown in the figure is turned on, and the developing solution 22 is pumped into the developing dish 23 of the developing unit 48 for about 30 seconds.

Thereafter, while the developer 22 continues to be circulated, the display 210 changes to a display 209 ("start can be started") and enters a "preparation state".

During this time, CPU 300 is used as the copier body (see Fig. 19).
Check and control are performed. This check and control means that, for example, in the cassette 20, if photosensitive paper is contained, the cassette is raised by the raising motor 29 to the paper supply surface where the paper surface is in contact with the paper supply roller 41, and the detection signal of the paper surface detection sensor PS4 is used. The lift motor 29 is turned off.

Then, the cassette size and the amount of photosensitive paper are displayed on the operation unit display panel by the cassette size sensor PS15 and the photosensitive paper remaining amount sensor (not shown). For example, if there are 150 sheets of A4 size photosensitive paper (about 2/3 of the full capacity), the "A4" part in the cassette size display 220 will light up, and at the same time, the remaining amount display 216 The two lamps on the left light up and are displayed visually so as to be easily understood.

 Similarly, the lower cassette 21 is displayed.

For example, if a cassette for A3 size is loaded but no photosensitive paper is loaded in that cassette, the `` A3 '' part in the cassette size display 221 will light up, but at the same time the photosensitive paper supply instruction 219 will also light up and light The replenishment of paper is prompted, and the remaining amount display 217 does not light at all.

 This is the state, that is, the “preparation state”.

Next, when the start / stop switch 200 in FIG. 17 is turned on, the display 209 disappears, the main motor starts rotating, the fluorescent lamp 160 for exposure is turned on, and the insertion instruction arrow 215 is turned on.

In this machine, a so-called automatic exposure (hereinafter referred to as “AUT EXPO”) that automatically controls the printing speed in a diazo copying machine
(SE is abbreviated as AE).
The copy process in the AE mode will be described.

The AE mode is set by moving the slide knob 201 to the leftmost AE position in the operation unit display panel in FIG. AE display 205
Lights up.

Note that when the slide knob 201 is at a position other than the AE position, the manual feed mode is set, and the copying operation is performed by the operator deciding the printing speed by the moving position of the slide knob.

Next, an outline of control when cassette paper is fed in the AE mode will be described.

In the AE mode, as shown by reference numerals 202 to 204 in FIG. 17, there are selection of photosensitive paper sensitivity (usually lower grade), selection of thickness of photosensitive paper (usually thinner), and adjustment knobs such as AE density level. It is assumed that predetermined settings have been made. In a diazo copying machine, a delicate density adjustment is performed with the above-described adjustment knob or the like in order to perform copy evaluation based on the density of the background.

The printing speed is determined by the AE light source lamp shown in Fig. 11.
The light transmittance output is measured by 28 and the photodiode PS1 and the light transmittance output is composed of the one-chip microcomputer shown in Fig. 14.
Calculation is performed by inputting the data to the CPU 300, and printing is performed by controlling the speed of the main motor 33 to a preset optimum printing speed. If the fluorescent lamp 160, which is the printing light source, has deteriorated, the detection output of the photodiode PS2 is output to the CPU 300.
, The necessary deterioration correction is performed, and the speed is controlled.

 Next, the copying operation starts.

The document side guide 220 shown in FIG.
When set to the position 4, LEDs 222 and 214 are lit on the operation panel display panel in FIG. 12, the upper cassette is selected, cassette feed (display 214), AE mode (display 2)
05), the insertion is OK (the insertion instruction arrow 215 is lit).

Now, when the document G is inserted along the document side guide 220 in FIG. 16, it is pulled in by the feed roller 307.
Then, when the insertion is detected by the insertion detection sensor PS3, conveyance of the document and the photosensitive paper and AE control are started.

Eventually, the document G passes through the position of the AE light source lamp 28.
When passing, the output of the photodiode PS1 when there is no original and the photodiode PS1 output when there is a document already input to the CPU 300 at the time of the insertion detection described above is input to the CPU 300, and the output when there is a document ÷ The document transmittance is determined by the output operation formula.

Further, in the copying machine, the transmission output when the document is present by the photodiode PS1 is stable when the rise is about 100 ms or more. Accordingly, as the sampling data for calculating the transmittance, the sample data after the document is detected by the photodiode PS1 or within 100 ms to about 200 ms is used, and the transmittance of the maximum value is set as the transmittance of the inserted document.

In this way, the AE control data has been prepared,
Next, a transport system for feeding photosensitive paper will be described.

In the cassette section, after the insertion detection sensor PS3 is turned on, the feed roller 41 starts rotating by the upper cassette feed clutch (not shown) at the N1 pulse, and the photosensitive paper K is fed out. Then, at the N2 pulse, preparation for aligning the leading end of the original and the photosensitive paper starts, and the main solenoid 13 (see FIG. 1) is turned off to lower the stop member 6 serving as a stopper, and the rollers 3, 7 are opened. . Here, the roller 3 and the stopper member 6 move in conjunction with each other, and the opening and closing of the rollers 3 and 7 are determined by raising and lowering the stop member 6, so that conveyance and registration adjustment can be controlled.

The original G and the photosensitive paper K are adjusted for registration so that the leading edge is aligned. The original G is fed amm after the original sensor PS7 is turned on, and the photosensitive paper K is over-feeded by about bmm. I do.

After the end matching operation is completed, the stop member 6 is raised by turning off the main solenoid 13, and the rollers 13 are closed to feed the original G and the photosensitive paper K to the exposure unit.

In the AE mode, the speed control in the AE mode matches the tip, that is, the CPU 300 corrects the printing speed according to the transmittance calculated as described above and the output of the photodiode PS2 at the time of the M1 pulse before the stop member 6 descends. The main motor 33 so that the proper AE speed is achieved.
Control.

In this way, the transmission and the AE speed are determined, and the speed of the document is controlled. Then, after the rear end of the document G has passed the insertion detection sensor PS3, the insertion instruction arrow 215 is lit again at the H pulse (Hmm), and the next document is waited for. Then, the measurement of the original transmittance and the printing light amount correction is performed on the next original in the same manner as in the above example, and the AE speed is set at the time of the M1 pulse as described above, and when the transmittance is significantly different from the previous original, For example, when the difference is 10% or more, the succeeding document is stopped at the leading end matching portion until the trailing edge of the preceding document passes through the exposure unit.

That is, by turning on the main solenoid 13 to open the rollers 3 and turning off the transport electronic clutch (not shown) for switching the driving of the rollers and stopping the feed roller 307, the subsequent original is processed. After stopping the previous document at the front end matching section until the previous document passes the exposure section, changing the rotation speed of the main motor 33 to the AE speed based on the following document transmittance, turning off the main solenoid 13, turning on the above-mentioned conveyance electromagnetic clutch To the exposure section.

Of course, if the transmittance of the preceding document and that of the subsequent document are not so large, the documents G are sequentially sent to the exposure unit according to a predetermined insertion interval. In this case, the AE speed in this case is equal to the AE speed of the previous document.

In the exposure section, the original and the photosensitive paper are conveyed while being pressed against the cylinder glass 43 by the belt 42. After the proper printing is performed in the exposure section, the original G and the photosensitive paper K
Are appropriately shifted from each other by shift rollers 44 and 45, and are separated from each other by a rotary guide 46. In other words, the photosensitive paper K is separated from the original G by being held in the notch of the rotary guide 46 that starts rotating at a predetermined timing, and then is conveyed to the developing unit 48 via the switching plate 47.

On the other hand, the document G is discharged to the external stop portion 51 via the discharge roller 49 after the notch has passed along the smooth surface of the rotary guide 46 which has already passed the rotation.

The conveying process of the photosensitive paper will be further described.
The CPU 300 controls the detection signal of S9 and the electromagnetic clutch (not shown) that switches on / off the shift roller 44 (arbitrary) and the shift roller 45 (high speed), and always shifts from the shifted state (electromagnetic clutch, on). Precisely until the completion (the electromagnetic clutch is turned off by the paper tension detection signal), the separation of the original and the photosensitive paper is assured.

As described above, the original G and the photosensitive paper K are moved by the shift rollers 44 and 4.
After being separated through five copies, the original G is discharged outside the apparatus, and the photosensitive paper K is sent to the developing unit 48. At this time, a detection signal of the original discharge detection sensor PS11 at the exit of the discharge roller 49,
According to each detection timing of the detection signal of the photosensitive paper detection sensor PS10 immediately after the rotary guide 46, the shift roller 4 described above is used.
The CPU 300 determines that the shift separation in the 4,45 copy has been correctly performed.

Thus, the switching plate 47 is operated by a solenoid (not shown), and the photosensitive paper is sent to the developing unit. If it is determined that the sheets are not correctly separated by the shift rollers 44 and 45, the switching plate 21 is not actuated, and the original or the photosensitive paper is transferred to the original discharge path provided with the discharge rollers 49 or the pair of rollers 50. The paper is discharged to the outside through the provided photosensitive paper reinsertion path.

The original discharge sensor PS11 and the photosensitive paper detection sensor PS
If both of the above sensors do not detect after a lapse of a specified time (number of pulses) after the detection of only 10 or the detection of the end of the shift, safety control such as stopping the drive or discharging outside the machine is also possible.

After the photosensitive paper K has been sent to the developing section 48, the photosensitive paper discharge detection sensor PS13 confirms discharge outside the machine (copy stock).

The above is the outline of the control from the insertion of the original in the cassette paper feeding to the discharge of the copy (photosensitive paper).

The same control is performed in the case of sheet feeding by the lower cassette 21. In the manual feed mode, the document side slide 220 shown in FIG. 13 is set at the manual position.
The copy operation is performed according to the display of.

The power supply has an auto shut-off function, and when there is no input signal from a document insertion or other operation section switches for a certain period of time (3 minutes in this example), the auto shut-off function is activated, and a copy preparation state is set. Is ready for copying.

In the preparation state, the display 210 and the light of the insertion instruction arrow 215 are turned off, and the display of the number of copies processed up to that time, the set cassette size, the amount of photosensitive paper, and the like are performed.
Further, the intermittent operation of the pump motor is performed, but the driving of the main motor 33 and the like is stopped.

(Effect) According to the present invention, appropriate copying can be automatically performed for continuous copying of different types of originals having different transmittances.
Good version.

[Brief description of the drawings]

FIG. 1 is a view for explaining the outline of a paper feed path of a diazo copying machine according to the present invention, FIG. 2 is a perspective view of a stopper and its driving system, FIGS. 3 to 15 are flowcharts, and FIG. FIG. 17 is an overall configuration diagram of a diazo type copying machine suitable for carrying out the present invention, FIG. 17 is a front view of an operation unit display panel of the above-described diad type copying machine, FIG. 18 is a front view of a document side guide unit, FIG. FIG. 2 is a control block diagram of a diazo type copying machine. 5: Stopper, 6: Exposure unit, G: Original, K:
Photosensitive paper.

Continued on the front page (72) Inventor Fumitaka Hyodo 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Masashi Shimada 1-3-6 Nakamagome, Ota-ku, Tokyo Co., Ltd. Ricoh (72) Inventor Yuichi Fujii 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (56) References JP-A-60-46537 (JP, A)

Claims (2)

(57) [Claims] 1. A diazo copying machine in which a transmittance sensor for a document is provided in the middle of a transport path, and an exposure speed is automatically adjusted based on detection data of the sensor to continuously copy images. On the road, a stop means for stopping the conveyance of the polymer of the original and the photosensitive paper is provided, and when the exposure speed is changed by inserting the original having a different transmittance from the original at the time of the previous copy, the original is exposed. When there is a polymer of the photosensitive paper, the polymer of the next original and the photosensitive paper is stopped by the stopping means, and after the exposure of the polymer of the original and the photosensitive paper being exposed is completed, the exposure speed of the exposure unit is stopped. A diazo copying machine, wherein after changing the exposure speed to a speed corresponding to a middle document, the polymer of the stopped document and photosensitive paper is sent to an exposure unit. 2. A diazo copying machine having a sensor for detecting the transmittance of a document to be copied on a conveying path of the document to be copied, and performing copying at an exposure speed automatically adjusted based on data detected by the sensor. When the exposure speed should be automatically adjusted by inserting the original to be copied, and when there is a polymer of the original being copied and photosensitive paper, the next original and the photosensitive paper After the exposure of the polymer during copying is completed, the exposure speed of the exposure unit is changed to an exposure speed corresponding to the document in standby, and then the polymer in standby is returned. A copying method using a diazo copying machine, wherein the copy is sent to the exposure unit.