JPS60178441A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent local rise of temperature of a platen glass and a scanner by changing the read position of the scanner for every one or several originals when originals are moved and read. CONSTITUTION:A reader D is so constituted that it is moved to two positions at least. As its means, for example, the first mirror base 22 is provided with a positioning projecting element 48, and sensors 49 and 50 facing each other are provided at a prescribed interval on the moving course of the projecting element 48. When a copy start button is turned on to operate a pick-up roll 37, a scanning motor M1 is rotated to move the first mirror base 22, and it is stopped in the position in a figure (1) when the projecting element 48 is detected by the sensor 49. The position of the reader D at this time is the first reading part. When the rear end of the original passes a sensor 47 of an inverting part 20, the scanning motor M1 is reversed, and the first mirror base 22 is moved in the reverse direction and is stopped in the position in a figure (2) which is determined by the sensor 50.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and particularly to an image copying apparatus having at least a moving original copying mode.

Currently, copying operations are becoming more automated and faster, and it is becoming common to use automatic document feeders to perform copying. In this case, the number of loaded manuscripts is one at a time!
The paper is transported and placed in a predetermined position on the platen), a predetermined number of sheets are scanned by the reading unit, and after copying, the paper is ejected and the next
:(A static original copying mode in which the operation of placing the original is repeated is common.

Here, when making multiple copies 11) from one original, there is little time loss, but when making one copy from one original, the first original is fed → placed → scan → ejected. → feeding the next original → placing the original, etc. The starting and stopping of original document exchange is repeated, which is disadvantageous in terms of time in the stationary original copying mode. In order to increase the document exchange speed, the reading section must be returned to the home position at high speed, which is mechanically difficult. That is, in the case of copying one original, the original moving reading is right-handed.

For this reason, a copying machine has been proposed that has a moving document copy mode function in which the reading section is fixed (stopped) at a fixed position and the document is read.

However, if the reading unit (lamp, mirror, mirror, etc.) is fixed at a certain temperature, the temperature near the reading unit will locally rise due to the influence of the lamp (halogen lamp, etc.) used in the reading unit. , the platen crow is heated and deformed,
Doing so may adversely affect the image or cause damage to it.
This may lead to a phenomenon in which the original and the platen glass are more likely to be charged, or the original and the conveyor belt may come into close contact with each other. At the same time, the air-cooling effect of scanning a mirror or a single mirror disappears, causing distortion of the mirror itself, which adversely affects the image. Furthermore, there are many problems such as the temperature fuse, which is generally installed for safety, frequently blows out.

The present invention aims to prevent the local temperature from rising by changing the reading section L for each one or several documents in a movable document copying mode, and to eliminate the drawbacks of the conventional two-unit device. .

Hereinafter, an embodiment in which the present invention is applied to a copying machine with both a stationary original copying mode and a moving original copying mode will be described in detail.

FIG. 1 is a longitudinal sectional side view of the apparatus, where A is the main body of the copying machine, and an automatic sheet document feeder is provided on the right side of the main body of the copying machine, and is roughly divided into a document separating section B and a document 1 receiving section C.

Inside the copying machine body, there is a reading section (scanner) D consisting of a halogen Lambert first mirror 2, second and third mirrors 3#4,
An optical system consisting of a lens 5, an FF54 mirror 6, a process mechanism consisting of a photosensitive drum 7, chargers 81, 82, 83, a developing device 9, a cleaner 1O, and a paper feed force cera)11. Devices for feeding, transporting, fixing, etc. such as a paper feed roller 12, a registration roller 13, a conveyance belt 14, and a fixing roller 15 are built-in. Since these mechanisms are similar to known devices, detailed explanations will be omitted.

The document separating section B is connected to the document tray 1 as shown in FIG.
7. Place the original P loaded with the image side facing down on top of the
Separate the sheets and feed them to the document transport section C side.

The document conveyance section C consists of a pickup roller mechanism connected to the document separation section B, and an endless conveyance belt 19 facing the platen 18 in close proximity to or in contact with the entire area. Belt 1
9, while pressing the platen 18 surface, transport the platen surface from right to left as shown in the figure at a constant speed synchronized with the circumferential speed of the photosensitive drum 7, and pass through reading section D''. let The original that has passed through the reading section (): is transferred to the next reversing section 2.
0, the document is conveyed in a U-turn manner to a paper discharge tray 21'2 disposed above the document conveyance unit, and is discharged with the image surface facing upward.

Then, the document transport cycle described in "2" is carried out on the document loading tray 17.
The process is automatically executed one by one for the stacked originals above.
The process of forming an image through the processes of exposure and fixing within the main body A is performed continuously for all Jffts and manuscripts.

Figure 3 is a trunk view of the main parts of the optical system inside main body A. The halogen lamp l and the first mirror 2 are fixed to the first mirror unit 22, and the halogen lamp l and the first mirror 2 are fixed to the first mirror unit 22, 3-23J- can be moved in parallel in the direction of the arrow. A wire 24 is fixed to the first mirror 22 and is looped around a driving pulley 25 and a driven pulley 26.

On the other hand, the second mirror 3 and the third mirror 4 are fixed to a second mirror unit 27 and supported by a rail 28 so as to be movable in parallel in the direction of the arrow. A wire 29 is fixed to the second mirror unit 27 and is connected to a driving pulley 30 and three driven pulleys.

The drive pulleys 25-30 are fixed to a drive shaft 32, and the shaft 32 is driven by a DC motor tI (and a motor M1 via a belt 33-pulley 34).A driven pulley 26
- 31 is rotatably loosely attached to the driven shaft 35. It should be noted that the structure in which the second mirror unit 27 moves in the same direction at the speed of the first mirror unit 22 is similar to the conventional one, and in the illustrated example, the difference in diameter of the drive boob 925-30 is 1. -The speed difference is as follows.

In the configuration of the embodiment described above, when using the static original copy mode, the optical system 1 can be switched on by operating the mode switching button.
5 to 5 is controlled to reciprocate a certain distance to the lower surface of the platen 18, and the document which is kept stationary at a certain position 4 on the platen 18 is scanned.

1. Record! When the ilJ switch button is switched to the moving original copying mode side, the optical systems 1 to 5 are stopped at fixed positions, and the original is transported over the platen 18 by the transport belt 19 and subjected to slit exposure to form an image thereof.

Automatic feeding of sheet originals is performed, for example, in the following manner.

When the stack of originals P is placed on the tray 171- in FIG.
The paper 36 detects the document tray (center). When the double = q' start button is turned on, the separation feed motor M2 (:511M) in the minute section B starts rotating, and the document feed belt 38 and pickup roller 3
Drive 7. The roller 37 is lowered by the swinging of the supporting arm, presses the leading edge of the original mold, and sends out the original on the first side.

Further, the separation belt 39 has its bearing member (not shown in the figure) pushed up and comes into contact with the document feed belt 38, and the drive shaft 40
The document feed belt 38 rotates in a direction opposite to that of the document feed belt 38, and only the topmost document is sent out.

The leading edge of the document is detected by the sensor 43 between the drive shaft 41 and the driven @ 42 of the document feeding belt, and the pickup 0 roller 37 is moved 7A to stop feeding the document from the east side. Due to the rotation of the guide 45. in the conveying section C. Send it to the destination.

When the leading edge of the document is detected by the sensor 44 in the transport section C, the document feed belt 38 and separation belt 39 stop rotating, and the separation belt 39 is lowered and separated from the feed belt 38. Release the document clamp, and wait for minute I11. Conveyance by section B is stopped.

Therefore, the document feeding is temporarily stopped by the document leading edge detection signal from the sensor 44. In response to the temporary stop signal, the pickup roller 45 at the entrance of the conveyance section B moves downward and holds down the document. Thereafter, the roller 45Φ conveyor belt 19 starts rotating by the motor inside the main body A, and the document is conveyed from right to left on the platen 18''.

A sensor 46 just before the conveyor belt 19 detects the leading edge of the document, and the sheet feed timing is determined, the registration is matched, and the copy sheet is sent out by the roller 12 shown in FIG. 1.

Single sheet feeding system by sending and receiving signals as described in 1111
Since the apparatus is obtained using a well-known technique for conventional copying machines, etc., the details thereof will be omitted.

The above is the general operating sequence of this type of device, and now an embodiment incorporating the present invention for the above purpose will be described.

When set in the moving original copy mode using the switching means,
The reading device is configured to be moved to at least two locations.

As one stage, for example, a positioning projection 48 is provided on the first mirror unit 22 as shown in FIG. 3, and corresponding sensors 49 and 50 are provided.
are provided on the movement path of the protrusion 48 at predetermined intervals.

When the copying start button is pressed ON and the pickup roller 37 is operated, the scanning motor Ml is rotated to move the first mirror 22, and when the protrusion 48 is detected by the sensor 49, the fourth Make it in the position shown in figure (1). The position of the reading section at that time is defined as the first reading section. Then, the document to be moved by platen 2 will be moved to + at that position.
i+l: taken and copied.

When the rear end of the document passes the sensor 47 of the reversing section 20, the scanning motor M1 rotates in the reverse direction, and the first mirror 22 moves in the opposite direction to the front, as determined by the sensor 50 in FIG. 4 (2). Stop at a position. The position of the reading section at that time is defined as the second reading section.

Figures 4 (1) to (3) are explanatory diagrams of the operation of L.
) shows the first document P1 being read at the reading position wSf, and (2) shows the second document P2 being read at the second document P2.
Figure (3) shows reading at the reading position.
FIG. 14 is a diagram showing the first document P3 being read again at the first reading position.

Note that the timing at which the operation signal is sent to the paper feed roller 12 by the signal from the sensor 46 is made to differ by 18 minutes from the position of the reading section t51-ffi2. Thereafter, the operation indicated by -1= is repeated until there are no more originals left.

As explained above, by changing the reading position of the scanner for each document or several documents when moving the document, local A temperature of the platen glass and scanner can be prevented, and the various adverse effects mentioned above can be prevented. It has the effect of removing

It is also within the spirit of the present invention to configure the reading unit to have two or more reading positions, and to convert the reading position to 4σ for several originals instead of one. Of course, it is possible.

Furthermore, although the embodiment has been described as a machine that can also be used in a stationary original copy mode, it can also be configured as a machine exclusively for the present invention.

The operation control procedure will be explained below.

FIG. 5 is an electrical diagram for controlling the operation described above. Ql is a control unit of the copying machine body including a well-known microcomputer, and Q2 is a control unit consisting of a microcomputer that controls the automatic document feeder.
Well-known L including M, IIAM, ALU, I10 latch etc.
It is SI.

In Q2, IIIFT is microcomputer Q2
interrupt terminal, B1. -BI8 is input port, BOo
-BO, is the output port, CK is the clock pulse detection sensor, and the clock 7 rotates in synchronization with the movement of the transport bell) 19.
The device detects slits in the board, and uses, for example, a photointerrupter consisting of an LED and a phototransistor.

SI to S4 are document detection sensors, and DSW is a pickup roller 45 and a guide 45 that swing upward at the input end of the document transport section C. Q+, an open/close switch that detects the open/close status of
``Qs is a transistor array composed of transistors and the like.

M2 is the separation motor, Mo is the conveyor belt drive motor,
0 is an electric clutch that transmits the drive between the motor M0 and the conveyor belt, and BK is an electric brake for accurately stopping the belt 19. Naoiri Capo) BI7.
BIe controls the copying machine main body control unit Q! It inputs the signal from Q1 and outputs the signal to Ql through the output ports BO4 to B08.

In the copying machine main body control unit Q1, AIO to AI7 are input ports, AO0 to AO2 are output ports, and S5 and S6 are reading unit position detection sensors.

S7 is a mode switch for selecting a moving original copying mode or a stationary original copying mode, which may be operated by an operator or may be automatically selected when setting a single copy. Q6 is a transistor array composed of transistors, etc., and Ml is a scanning motor for moving the reading section. Input ports AI, .about.AI input signals from document feeder control section Q2, and output ports AO, . . . AO2 output signals to Q2.

The signal output from AO starts the document feeder, Shinso, and the signal output from AO2 sends the mode selected by the mote switch S7 to the document feeder.
The signal output from B04 indicates that a document has been placed on the platen when in document copy mode. This is a signal that informs the main unit.

FIG. 6 is a flowchart 1 for performing the operation control.

The operation will be explained below with reference to this.

First, when the copying machine is powered on, initial setting and standby processing are performed, and when a copy button (not shown) is pressed, it is determined whether the moving original copying mode or the static original copying mode is selectedff1i. Selection of this copying mode is performed by means such as a selection button on an operation panel (not shown) on the main body of the copying machine.

First, when the moving original copy mode is selected, the scanning motor Ml is advanced after confirming that there is an original on the stacking tray 17, and when the protrusion 48 is detected by the sensor 49, the motor Ml is stopped. , the reading section is in the first reading position (Fig. 4 (
1)) is set.

Next, the feeding of the original set on the tray 17 is started by a start signal, and when a predetermined timer period has elapsed after the leading edge of the original is detected by the sensor 46, the copy paper feeding of the copying machine main body is started, and copying is started. will be held.

After the trailing edge of this one document passes the sensor 47, it is determined whether there is still a document left on the tray 17, and if there is no document, the system returns to the standby state.
1 is reversed until the protrusion 48 is detected by the sensor 5o.

The reading section is now placed at the second reading position (FIG. 4(2)). Then, feeding of the document set in the tray 17 is started by a start signal, and when a predetermined timer period (a time different from that for the first sheet) has elapsed after the leading edge of the document is detected by the sensor 46, the copying machine Copy paper feeding into the main body starts and copying is performed.

After the trailing edge of the second document passes through the sensor 47, it is determined whether there is still a document left in the tray 17. If there is no document, the system returns to the standby state, and if so, moves Ml forward to produce the first document. Copying is performed at the first reading position in the same manner as in the above case, and the process is repeated until there are no originals left on the tray 17.

Next, a case where the static original copy mode is selected will be explained. When it is confirmed that the original is set on the tray 17, it starts feeding the original, waits for the original to be set on the platen 18 (wait for the ready signal to be issued), and then waits for the original to be set on the platen 18 (wait for the ready signal to be issued). A number of copies are made (scanning the reading section) and this process is repeated until the tray 17 runs out of documents.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an example of an image forming apparatus to which the present invention is applied, FIG. 2 is a vertical side view of an automatic sheet document feeder, FIG. 3 is a perspective view of the arrangement of the optical system, and FIG. ) to 4(3) are schematic diagrams explaining the movement of the reading section, FIG. 5 is an operation control block diagram, and FIG. 6 is its flowchart. 6A is the main body of the copying machine, B is the sheet document dividing section, C 1 is the document conveyance unit, D is the document reading unit, 19 is the document conveyance belt, 1
8 is a platen glass, and 49 and 50 are sensors that determine the document reading position. Patent applicant Fuku Hitoshi, representative of Canon Co., Ltd. 1)

Claims (1)

[Claims] (1) An image forming apparatus having a moving original copy mode, characterized in that the original reading position is moved every predetermined number of copies.