JPS5912425A - Copying machine - Google Patents

Abstract

PURPOSE:To eliminate unnecessary preliminary movement and to increase a copying speed by providing a copy magnification setting means, a reciprocative scanning means, and a detecting means, etc., which are arranged on the scanning path of the scanning means to detect the position of the scanning means. CONSTITUTION:Copy magnification is varied by varying the scanning speed of a platen 2 and shifting a lens 7 and a movable mirror 8 in position. The platen 2 uses a motor M as a driving source to scan as shown by an arrow A and return in the opposite direction. Further, reed switches SW1-SW6 for detecting the position of the platen 2 are arranged on a copying machine body 1 along the scanning path, and a permanent magnet for operating the respective switches SW1-SW6 is provided to the platen 2. Consequently, unnecessary preliminary movement is eliminated and the copying speed is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION 111 The present invention relates to a copying machine, and particularly to backward movement control of a document image scanning means.

[Ll] Conventionally, a scanning copying machine is equipped with only one fixed position switch on the scanning start side of the scanning path of the scanning means (optical system or document table) to switch the scanning means from return to scanning. The scanning means then goes to turn on this position switch.

Note that a switch that maintains an on state when the scanning means is stopped and waiting at the home position is usually referred to as a fixed position switch. However, in a copying machine whose stop position is not at the scan start position, a detection switch installed in the middle of the scanning path functions as the fixed position switch.

By the way, in order to scan the original image on the photoreceptor, the scanning means needs to move at a stable speed without photographing.

For this reason, exposure is generally started from the fixed position switch (+
:/ L/ The preposition movement distance N1 is set at 11, and the vibration of the running means caused at the time of startup is damped.

However, since only one fixed position switch is installed, the preliminary movement distance - white 5 is constant even if the copying magnification is different. However, the scanning speed varies depending on the copying magnification, and as the copying magnification increases, the scanning speed becomes more stable and the occurrence of vibration decreases.
The culm preliminary movement &li 1ill, which increases the copying magnification, can be shortened.

In other words, in conventional copying machines, even in the enlargement mode and the same magnification mode, which require a short preliminary movement distance, a long preliminary movement corresponding to -14 on the reduction is performed, which reduces the copy speed (number of copies/time). This was the cause of the decline. In particular, in multi-copying, the time required for extra preliminary movement accumulates, and the copy speed decreases significantly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine that can eliminate the above-mentioned extra preliminary movement and increase the speed of the two-piece bead.

1. In order to achieve the above objects, the machine according to the present invention includes a copying magnification setting means, a reciprocating scanning stage, and a scanning stage disposed in the scanning path of the scanning means. A detecting means for detecting the position, and a control unit that uses signals from the copying magnification setting means and the detecting means to change the position at which at least the temporary scanning means switches from backward movement to movement in accordance with the copying magnification. By controlling the switching timing from backward movement to forward movement according to the copying magnification, unnecessary preliminary movement can be eliminated.

1 to 4 show a first embodiment of a copying machine according to the present invention. In this first embodiment, the document table is used as a scanning means and can be moved back and forth, and the copying rate is 8. Reduction 1. It can be changed to four types of reduction 2.

Explain the outline of the copying machine with reference to Figure 1.
Ru.

The document table (2) is installed on the plane of the copying machine body (1), and is capable of scanning in the direction of the arrow (Δ) and returning in the opposite direction using the main motor (M) as a driving source. The document is placed face down on the glass (not shown) of the document table (2) and is irradiated with light from the exposure lamp (5) as it is scanned by the document table (2), and the reflected light is reflected by the fixed mirror. (6), the projection lens (7), and the photosensitive drum (1o) via the movable mirror (8>).
) is exposed in a slit state. The copying magnification can be changed by changing the scanning speed of the document table (2) and the lens (7).
This is done by changing the position of the movable mirror (8).

The photoreceptor drum (10) is rotatably driven at a constant peripheral speed in the direction of the arrow (a). (13>, Copy paper separation chiller (14), blade type cleaning device (15).

An eraser lamp (16) is installed.

Copy sheets are stored in advance in an automatic paper feed cullet (17), and are fed one by one by rotation of a paper feed roller (18). The copy paper conveyance path has a timing [1-ra pair (20)
, the photosensitive drum (10) and the transfer/separation charge r
(13), (14), conveyor belt (22).

It is composed of a fixing device (23). Paper feed []-ra (
ig), the timing roller pair (20) is provided with clutches (19) and (24), respectively, and is driven to rotate at a predetermined timing as explained below. In particular, the timing roller pair (20) is used to align the leading edge of the -C copy paper with the leading edge of the IC toner image formed on the photoreceptor drum (1(+)) at the transfer section in response to changes in copying magnification. .Also, the cullet (17) is -U depending on the copy paper size.
B 4. A4. B5. Four types of A5 sheets can be set and selectively ejected to the paper feed section.

Meanwhile, a transmission device (3) is interposed between the main motor (M) and the means for directly driving the document table (2). This transmission (3) can change the scanning speed according to the copying magnification, and for this purpose, an enlargement scan clutch, a same-size scan clutch, a reduction 1-scan clutch,
Includes a reduced 2-speed gun clutch and a return clutch. The various clutches are selected in response to the operation of a magnification setting key (installed on the operation panel) and operate at the timings described below to move the document table (2) back and forth at a predetermined speed. However, the return speed is constant regardless of the copy magnification.

In addition, on the top of the copying machine body (1) there is a reed switch (SWl ”) - (S
W6) is installed along the scanning path, and a permanent magnet 1 (4) for operating each switch (SWl) to (SW6) is installed on the document table (2). Su, Idge (SWl)
This means that the document table (2) is in standby at the home position, and that the document table (2) is on standby at the time of multi-copying when the copy magnification is reduced to 1°2.
2) detects the timing of switching from return to scan. The switch (SW2) detects the timing to switch the document table (2) from return to scan at the same time when the copying magnification is enlarged or same size. In this embodiment, as a result of an experiment, the preliminary movement distance for the reduction scan of 1°2 is set to 6-Omn+, and that for the enlargement and the same magnification is set to 30 control. Therefore, the switch (SW2) is the switch (SW2).
I ) is 30+n+n ↓ Yang Banji. The other switches (SW3) to (SW6) are used to detect the timing at which the copy paper is conveyed from the timing []-ra pair (20) to the transfer section, respectively, and the switch (SW6)
W3) is enlarged, switch (SW4) is same size, switch (SW5) is reduced 1, switch (SW6) is reduced 2
Corresponds to - Ruru.

The copying machine having the configuration described above is controlled by a micro-amp coater. The human power boat of the micro-1 bicoater is as shown in Figure 2. )～(
A detection signal from SW6) is input. In addition, the main motor (M
), one pre-lighting of exposure lamp (5), electrification charge v (11), transfer/separation charge rz (13)
, (14) , paper feed clutch (19), timing clutch (21) and enlarged Skilleno clutch in transmission device i & (3) 2 equal-size scan clutch, reduced 1 scan clutch, reduced 2-suc clutch, return The clutches are respectively on and A) controlled.

Next, regarding the copying operation, flowcharts 17-1 to 17-1 not shown in FIG.
-1 will be explained. Incidentally, FIG. 4 shows the timing when copying at the same size.

First, when the power is turned on, initial settings for the entire copying machine are performed (step ■). In this case, Micro-1
-Yu no Deno J Bo 1- (PO) ~ (R3), (QO)
~(Q3), (RO)-(R3) is set to ``[-'', and other control systems such as the fixing device 23) are preheated.

When the switch is turned on (step ■), the output ports 1 to 1 (PO) turn to ``, and the main motor (M)
is started. At the same time, the internal timer ((1) starts (step ■), and the internal timer (mouth) ends until it turns over (
Step ■), wait for the main motor (M) to reach a steady state, and other outputs are inhibited.

When 11 seconds have elapsed since the print switch was turned on, it is determined whether the switch (SWI) is on or not (Step ■). That is, it is confirmed that the document table (2) is waiting at the small position. If the switch (SWl) is ON or NO, the document table (2) is not waiting at the home position, so turn on the return clutch (step ■) and make sure to return the document table (2) to the home position. .

If the switch (SWI) is on, the following copy preparation operation is performed. That is, the turn clutch is A
Turn on the preliminary lighting of the exposure lamp (55), and transfer/transfer.
Turn on separation charge ↑, (13), (14) (steps ■, ■, ■) ,, II-rJ ll#
The internal timer (t2) is started at 1 (step [phase]) and its completion is waited for (step 0). When t2 seconds have passed, the H light lamp (5) is switched from preliminary lighting to main lighting (step O2 [phase]), and the charger (11
) to turn on Step 0). At the same time, the timing clutch (21) is turned off to ensure that the rotation of the timing roller pair (2o) is stopped (step O), and the paper feed clutch (19) is turned on (step [phase]). , feed copy paper from the casette (17). Furthermore, start the internal timer (t3) (step 0).
.

Next, step @0 to determine the selected copy magnification.
．． ＠）, the corresponding preference 17 clutch.

Select the operation of switches (SW3) to (SW6). That is, the scan clutch corresponding to the selected copy magnification is turned on (steps [phase], [phase], 0.[phase]).
, the document table (2) starts scanning. At the same time as the scan starts, start the scan timer (t4) (step O, @), @), @>, step ◎ to start the scan timer (t4).
At the end of the internal timer (t3) (step O
, 0, 0, [phase]), and turn off the paper feed clutch (19) (step O2 [phase], @, o).

During this time, the leading edge of the copy paper reaches the timing roller pair (20) and waits while forming a loop at this portion. In other words, the internal timer (13) ensures that the leading edge of the fed copy paper waits before the timing 1 cola pair (20).

In addition, the scan timer (t4) is used to set the scanning distance according to each copying magnification and copying paper size. A travel time corresponding to the distance is set in the scan timer (t4). Note that the copy paper size can be determined manually using the setting keys shown in FIG. 2, or by an output signal from a paper size detection element provided in the automatic paper feed cullet (17).

At a certain timing with the start of scanning, the photosensitive drum (10) is rotated in the direction of arrow (a) in FIG.
The original image is sequentially exposed onto the photoreceptor drum (10) in the form of slits. The timing for conveying the copy paper to the transfer section is
(Steps @), @), which are taken when any of the switches (SW3) to (SW6) are turned on.
@, @). That is, the switches (SW3) to (SW6) are sequentially turned on in accordance with the scanning of the document table (2), and the steps @),
O, @ switch for timing (SW3
) to (SW6) are determined.

Then, when any of the switches (SW3) to (SW6) is turned on, the timing clutch (21) is turned on (slap 0), the copy paper is conveyed to the transfer section, and from then on until the scan timer (t4) ends (step @),
Scanning of the document table (2) continues, and the scanning of the photoreceptor drum (1) continues.
0) The toner images formed thereon are sequentially transferred onto copy paper.

When the scan timer ([4)] expires, the scan clutch is turned off (step ◎), and scanning of the document table (2) is stopped. At the same time, the charging charge 17 (11) is turned off, the main lighting of the exposure lamp (5) is turned off (step @), @), and the return clutch is turned on (step @). With this, the document table (2) begins to return toward the Baume position. When it is confirmed that the switch (SW6) is turned on during this return (step ◎), it is determined whether the final copy has been completed (
Step O). If it is multi-copy and the set number of copies have not yet been completed, turn on the preliminary lighting of the exposure lamp (5) in preparation for the next copy.
) , :1. Switch (SW2) 1fiA > J
(step). Switch (SW2)
When turned on, it is determined whether the selected copying magnification is enlargement or equal magnification (step 0).

If the copy magnification is enlarged or equal to the original size, the preliminary movement distance of the document table (2) can be as short as 30+++ m, so immediately turn the return clutch on (step O) and stop the document table (2). Then, return to step O, and repeat the same copying operation. -10,000, if the copy magnification is 1.2, the pre-excitation movement distance is required to be 60+++n+, so continue the return and wait for the switch (SWI) to be turned on (step O). When this happens, the return clutch is turned off, step O), the document table (2) is stopped, and the process returns to step @.

Also, if it is determined that it is the final copy in step @, the return is continued and the switch (SWI) is pressed.
Wait for A> to be completed (step (2) is stopped at the home position. After that, the transfer/separation charger (13) performs other processing, for example, at the timing when transfer is predicted to be completed.

(14) is turned off, and the main motor (M) is turned off at the timing when the copy paper is predicted to be ejected to the tray (24) (step O).

That is, in this first embodiment, two detection switches (SWl) and (SW2) are provided in the scanning path, and the timing for switching the document table (2) from return to scanl in the middle of multi-beam is determined by Switch (SWI) depending on the required distance of preliminary movement.

(SW2) to detect it.
Specifically, expansion that requires less preliminary travel distance.

At the same magnification, the screen is switched to the 17th screen at an early stage at the detection timing of the switch (SW2). Therefore, in the case of magnification of 2 equal magnification, the extra preliminary movement is omitted, and it is possible to move between 'switch (SW2 > - (SWI')) on the manuscript table (
2) It is possible to shorten the time required for the reciprocating motion, and the bee speed.

Note that the switch (SWI) also functions as a fixed position switch at the home position, and scanning for the first copy of a single-beam or multi-copy starts from the Baume position.

5 to 8 show the second embodiment. The second embodiment, as shown in FIG.
0) above, it is placed well before the exposure position. Therefore, in the case of multi-copying, it is necessary to turn on the charging charge v (11) before the actual lighting of the exposure lamp (5) starts, and this timing must be set during the return of the document table (2). Must be number one. Therefore, the detection switch (SW2) is installed roughly closer to the scanning direction than the setting position in the first embodiment, and the detection switch (SW2) is
) delay timer (TI).

(T2) is delayed and from the return of the document table (2)
Changed to switch to 7.

That is, in the case of enlargement or the same magnification that requires a preliminary movement distance of 30 mm, at the timing when this switch (SW2) is turned on (step @), Q), the electrostatic charge p < 11)
Turn on the return clutch (Step Q), start the delay timer (1-1) (Step O), and wait for its completion [(Step 0), turn off the return clutch (Step O).
[See Figure 7]. The setting time of the delay timer (T1) is the switching position for a predetermined scan after the document table (2) turns on the switch (SW2) and turns on the switch (SW2) that is connected to the first embodiment. This is the time required to return to position 1.

In addition, reduction 1. which requires 60 mrrl as a preliminary movement distance. In reduction 2, at the timing when the switch (SW2) is turned on (step 0.0>), the delay timer (
Start F2) (step Q), wait for the completion of step A (step O), and turn on the charger (11) (step O). At the same time, the delay timer (T1) is started (step O by turning off the step clutch) [see Figure 8]. In this case, the document table (2) t is the time required for the switch (SW
Return to the position where I) is turned on and switch to skit.

In this way, two delay timers (+1 >, Ir2)
By using this, two types of preliminary movement distances can be secured, and the turning on of the switch (SW2>) can be used as the timing for turning on the charging charger (11).

In addition, the detection switch (SWl) is set on the original platen (2) when scanning the first sheet of single copy and multi copy.
is at the home position, and also functions as a detection switch for returning the J1j manuscript table (2) to the home position (step Q> at the end of the final copy 1; 4. Figure Norochi (
Timing chart t7-1 of [Fig. 7, 81] shows the characteristic part of the second embodiment;
This is similar to the example.

<2, the present invention is not limited to the above embodiments <j:
< , you can make various changes within the scope of the summary. In particular, it is suitable for a copying machine which uses an optical system as a scanning means instead of a document table (2). Also, the preliminary movement distance of 60 nun and 30 mm is just an example [it is not too much, and the preliminary movement distance can be set not only in two stages but also in four stages.
If it is possible to select different types of copy magnification, it may be possible to switch between four levels.

L As is clear from the above description, the present invention includes a copying magnification setting means, a scanning means capable of reciprocating movement, a detecting means disposed in a scanning path of the scanning means to detect the position of the scanning means, and the above-mentioned A control means for controlling the position at which the scanning means for at least multi-copying is switched from backward movement to forward movement according to the signals from the copying magnification setting means and the detection means so as to change the position according to the copying rate. Since the value I can be set, the scanning means can be switched from backward movement to forward movement at the optimum position according to the copying magnification.
Redundant preliminary movement is removed, and copying speed can be increased.

[Brief explanation of the drawing]

1 to 4 show the first actual copying machine Mi of the copying machine according to the present invention.
Fig. 8111 is a schematic configuration diagram of a copying machine, and Fig. 2 is an explanatory diagram of microphone 1'' combination coater inlet/output capo-1.
Figures 3A to 3D are 1-1-1-chip-1-1 4th
The figure is a timing chart. 5 to 8 show the second embodiment, FIG. 5 is a schematic configuration diagram of the copying machine, and FIG.
The figure is a flowchart, Figure 7. FIG. 8 shows the timing chart t-h. (1)...Copy machine body, (2)...Document stand, (4)
... Permanent magnet, (10) ... Photosensitive drum, (SW
+). (SW2)...Detection switch.

Claims (1)

[Scope of Claims] A scanning type copying machine capable of changing 16 copying magnifications, comprising a copying magnification setting means, a scanning means capable of reciprocating movement, and an image of the scanning means disposed in a scanning path of the scanning means. A detection means for detecting the apparatus, and signals from the copy magnification setting means and the detection means cause at least the multi-copy temporary scanning means to switch from backward movement to forward movement (control to change the 17 positions according to the copy magnification). 2. The detection switch includes a first detection switch and a second detection switch, and the control means activates one of the detection switches according to the copying magnification. 3. The copying machine according to claim 1, wherein the scanning means is switched from backward movement to forward movement when the scanning means is detected by a detection switch which is activated. The copying apparatus according to claim 1, characterized in that the signal of the detection means is delayed to switch from the backward movement to the forward movement, and the delay time can be changed according to the copying magnification. Machine.