JPH02150867A - Image forming device - Google Patents

Abstract

PURPOSE:To detect a document on platen glass speedily without making the device complex by inhibiting a document feeding and discharging device from being driven until nonclamping and clamping by an original platen cover are detected again after nonclamping and clamping are detected. CONSTITUTION:After a detecting means 118b detects the nonclamping and clamping of a document by the platen cover 51, the document is supplied from a 1st stack part onto an original platen 12 and the original feeding and discharging device 3 which discharges the document to a 2nd stack part is inhibited from being driven until next nonclamping and clamping are detected. The document on the original platen is detected speedily without making the device complex. Consequently, even when the document is left forgetfully on the original platen glass 12, automatic document feeding (ADF) operation is inhibited, so the occurrence of a jam can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement of an image forming apparatus having a document feeding/discharging device.

(Prior Art) Generally, an image forming apparatus, such as an electronic copying apparatus, includes a document feeding/discharging device that automatically supplies and discharges a large number of documents to make copies. Some of these devices include a delivery roller provided on the edge of the original glass, and the delivery roller supplies and discharges the original onto the original glass. This type of device automatically feeds and ejects the document in the document automatic feed mode (hereinafter referred to as ADF mode).
While the platen cover remains in close contact with the original glass, the original is fed to and ejected from the original glass by the delivery roller.

During this time, the platen cover is not opened or closed at all, and it is only opened and closed at 72 seconds and when there is a full 1 bee.

In the case of manual copying described above, after the original is placed on the original glass as the platen cover is opened/closed and the number of copies has been made, if the platen cover is not opened/closed, the original will not be placed on the original glass. Tama, Tokoro, Tli? ?
I become forgetful.

(Problem to be Solved by the Invention) In the conventional device, when the original is fed by the feed roller in ADF mode with two originals left behind on the original glass, it collides with the FA original that was left behind, causing the original to be damaged. Damage may occur.

As a countermeasure, it is possible to install a sensor on the document glass surface and add a control circuit that receives a detection signal from the sensor and notifies you of misplacement, but this would make the mechanism of the device complicated and , there was a fear that this would lead to an increase in costs.

The present invention has been made in view of the above, and an object thereof is to provide an image forming apparatus that quickly detects a document on a document glass without complicating the device.

[Structure of the Invention] (Means for Solving Problem 1) In order to achieve the above object, the present invention supplies a document from a first stacking section onto a document placing table, and further supplies the document to a second stacking section. A document feeding/ejecting device that discharges the document; a platen cover that is located on the document placement surface side of the document placement table and that holds the document between the document placement table; and detecting whether the document is being held or not held by the platen cover. and a control means for prohibiting the driving of the document feeding/discharging device until non-clamping and clamping are detected again after non-clamping and clamping are detected by the detecting unit. .

(Function) In the image forming apparatus having the above configuration, after the non-clamping and the clamping are detected by the detection means for detecting the non-clamping and clamping of the document by the platen cover, the image forming apparatus continues until the non-clamping and the clamping of the document are detected again. Since the driving of the document feed/discharge device that supplies the document from the first stacking section onto the document table and further discharges the document to the second stacking section is prohibited, the document on the document glass can be quickly detected.

(Example) An embodiment of the present invention will be described in detail below with reference to the drawings.

In this embodiment, a copying apparatus main body (hereinafter referred to as the apparatus main body) 1
, a platen cover device 2 , and a document feed/discharge device 3 .

On the upper surface of the apparatus body 1 in the figure, there is a transparent document glass 12 on which a document 11 fed from a document feeder/discharge device 3 to be described later is placed.
(original table) is attached. The above device body 1
At the lower right side of the figure, there is the main body 1 of the apparatus and a freely attachable paper feed cassette 13, 14, and at the lower left side of the figure, at the paper output end, there is a tray 15.
is taken and f=Jt.

On the other hand, inside the device main body 1, various devices described below are housed. That is, an optical system consisting of an exposure lamp 21 and mirrors 22, 23, and 24 that reciprocate along the lower surface of the original glass 12 in the direction of the arrow 16, and the reflected light from the exposure scanning of the optical system are transmitted to the variable magnification lens block 25 and A photoreceptor drum 27 that forms an image via a mirror 26, a developing device 28 that applies toner to the electrostatic latent image formed on the surface of the photoreceptor drum 27 to make it visible, and a photoreceptor Copy paper 31 stored in cassette 13 or 14 in synchronization with the rotation of body drum 27 in the direction shown by arrow 29
is sent to the transfer charger 38 and the peeling charger 39 through the delivery roller 32 or 33 and the guide section 34 or 35, and the registration roller pair 41 is brought into close contact with the surface of the photosensitive drum 27, and the transfer charger 38 is connected. A conveyor belt 42 conveys the copy paper 31 through which the toner image is transferred and is separated from the photosensitive drum 27 by a peeling charger 39. A conveyor belt 42 is provided at the end of the conveyor belt 42 to fix the toner image on the copy paper 31. A pair of fixing rollers 43 for fixing, a pair of discharge rollers 44 provided adjacent to the pair of fixing rollers 43, and the like are accommodated. The copy paper 31 is then discharged onto the tray 15 via this pair of rollers 44.

Further, along the rotational direction of the peripheral edge of the photoconductor drain 27, a charger 45 for neutralizing static electricity removes the toner attached to the surface of the drum 27 after static electricity is removed. Blade-type cleaner 46 made of urethane rubber
, a static eliminating lamp 47 for erasing an afterimage on the drum 27, and a charger 48 for charging the surface of the photosensitive drum 27 and forming an electrostatic latent image during the above-mentioned exposure. Furthermore, a cooling fan 49 is provided within the apparatus main body 1 to prevent a rise in temperature.

The main body 1 of the apparatus is constructed as described above. To summarize its function, the image of the original 11 on the lath 12 is as follows.
An image is formed on the photoreceptor drum 27 through an optical system, a lens block 25 for variable magnification, etc., and the latent image is developed by a developing device 28. On the other hand, the copy paper 31 sent out from the paper feed cassette 13 or 14 is further fed by a pair of register rollers 41, contacts the photosensitive drum 27, the toner image is transferred thereto, and is fixed by a pair of fixing rollers 43. Copying is completed and the paper is discharged onto the tray 15.

Next, the platen cover device 2 will be explained.

This includes a platen cover 51 and an operating mechanism 52 for operating the platen cover. The platen cover 51 has one end supported in a position close to the original glass 12, is rotatable, and is fitted into an exterior cover part 55 previously provided so that the original glass 12 can be freely opened. r5 side 56
A plate-shaped movable cover part 57 rotatably supported at
It consists of The front end of the platen cover 51 is used when an attendant places the original 11 on the original glass 12 and copies it during manual copying.
An opening/closing switch with a convex shape that detects opening/closing of
118a is provided. The setting position of this switch 118a can be selected from a wide range within the position where the platen cover 51 is overlapped when it is closed. Furthermore, switch 118a
The device itself is not limited to the one used in this embodiment and can be widely adopted, such as optical devices.

On the other hand, the front side of the peripheral area of the original glass 12 (front side in the figure)
For example, a platen opening/closing switch f118b tfim having a built-in magnet is provided to detect contact or separation of the platen cover opening/closing switch 118a. This platen open/close switch 118b sends a detection signal to a document feed control unit 141 (described later) when the document 11 is placed on the document glass 12 by an attendant and the platen cover 1188 is lowered to come into contact with the platen cover open/close switch 118a of the platen cover 51. This outputs the following.

The other end side 58 of these is provided with a long hole 59 for rotating this. Further, a plurality of return spring bodies 60 made of compression springs are attached between the exterior cover part 55 and are always pressed downward, that is, toward the document glass 12 side. This rotation is restricted. The exterior cover part 55 and the movable cover part 57 rotate together to open and shield the original glass 12. When shielding, the movable cover part 5
7 is pressed against the original glass 12 via the original 11 or directly.

As shown in FIGS. 3 and 4, the operating mechanism 52 includes a rotation transmission shaft 65 that passes through the exterior cover portion 55 and is attached to the rotary mill 1.

A lever 66 and an L-shaped bar 67 are fixed to this, and one end of each is fitted into a long hole 59. When the J-shaped lever 67 rotates, the lever 66 also rotates. The movable cover portion 57 is rotated around one end side. Further, a guide block 6 is provided on the upper surface of the exterior cover part 55.
8 is attached, thereby guiding the suppressing piece 69 so that it can move forward and backward, and one end of this is connected to the other end of the L-shaped lever.

On the other hand, on the top surface of the device main body 1, an operating cam 70 consisting of an eccentric cam, an operating lever 71 as a driven body, and an operating motor 7 consisting of a pulse motor that suppresses rotation of the operating cam 70 are provided.
2 is installed. When the operation lever 71 rotates in the direction of arrow 73 due to the rotation of the operation motor 72 and presses the suppression piece 69, the L-shaped bar 67 rotates and the rotation transmission shaft 65 rotates in the direction of arrow 75. The movable cover part 57 is
The original glass 1 is rotated upward against the return spring body 60.
The portion that is in close contact with 2 is separated, and a feeding/discharging gap 76 through which the original 11 can freely pass is formed. When the operation cam 70 rotates roughly, the operation lever 71 rotates in the direction opposite to the arrow 73, and eventually the return spring 60 causes the movable cover portion 57 to rotate downward and come into close contact with the document glass 12.

Next, the document feeding/discharging device 3 will be explained. For each part,
To explain along the conveyance path of the document 11, first, the tray 8
A pickup roller 82 is provided on the document 11, and the pickup roller 82 contacts the document 11 and sends it out according to a command from the control section. The sent original 11 passes between the paper feed roller 83 and the separation roller 84 , and only the negative original 11 is further fed and enters the registration roller 85 . A gate 87 is provided at the exit from the gate 87, and a lower part 88 of the gate 87 is rotatable so that the document 11 to be supplied can be rotated and passed through the gate 87. The document 11 to be discharged is guided upward. The original 11 that has been transported is
The original glass (4) reaches the glass 121-, and is sent further inward by a delivery roller 95°95 provided at this end.This delivery roller 95 is connected to a roller support shaft as shown in FIG. The roller shaft 97 is fixed to both ends of a rotatably supported roller shaft 97 by a pair of support brackets (not shown) fixed to the roller support shaft 96, and the roller shaft 97 is moved toward and away from the document 11 by rotating the roller support shaft 96. A roller rotation shaft 98 is rotatably supported parallel to the roller support shaft 96, and is connected to the control motor 1 via pulleys 99 and 100.
01 for forward and reverse rotation. This rotation of the roller rotation shaft 98 is transmitted to the roller shaft 07 via pulleys 102, 103, 104, and 105, and the delivery rollers 95 and 95 are rotated forward and reverse at appropriate times.

Now, if the direction of arrow 106 is normal rotation, the document 11 is sent in the supply direction by normal rotation and sent in the discharge direction by reverse rotation.

Furthermore, a discharge roller 108 is rotatably supported parallel to the [1-ra circumferential rotating shaft 98, and is mounted on the discharge roller 108.
A 1-roller 110 is attached, rotates integrally with the discharge roller shaft 108, and faces the exit of the gate 87 together with a guide roller 111. This discharge roller @108 is connected to the pulley 1
12 and 113, and is rotated by a rotary wheel 98. Then, the original 11 ejected by the reverse rotation of the feed roller 95 passes through the gate 87 and is ejected (-1-ra 110
As a result, it is pulled out and absorbed onto the platen cover 51.

The platen cover device 2 and document feed/discharge device 3 are configured as described above, and their functions will be explained next.

The overall operating order is shown in Figures 6(a) to 6(e).
) is shown.

In FIG. 6(a), the original 11 fed out by the pickup roller 82 passes between the separating roller 84 and the paper feed roller 83, and -th original 11 is registered. Next, in FIG. 6-(b), the movable cover portion 57 of the platen cover 51 is rotated upward, and a supply/discharge gap 76 is formed. The sent original 11 is sent onto the original glass 12 by the forward rotation of the sending roller 95.

Next, in FIG. 6(C), the sent manuscript 11 is
By reversing the feed roller 95, it is moved back a little and comes into contact with the protruding positioning scale body 90, and is positioned at the copying position. Further, after a portion 88 of the gate 87 rotates to allow the document 11 to pass through, the gate 87 returns to its original state due to its own weight.

Next, in FIG. 6(d), the movable cover part 571 is rotated to cover the F-C original glass 12.

There, it is copied onto copy paper 31.

In FIG. 6(e), after copying, the movable cover portion 57 rises again to form the supply/discharge gap 76, the positioning scale body 90 descends, and the document 1
1 is discharged, passes through a gate 87, and is taken out by a discharge roller 110.

7 and 8 are diagrams showing the relationship between the original [11] and the feed roller 95 during manual copying.

First, FIG. 7 shows a case where, for example, an A4 size original 11a is placed on the original glass 12. On the left side of the original glass 12 in the figure is the original 1 for manual copying.
A fixed scale 130 is provided as a set reference of 1,
Adjacent to the fixed school 130 is an A4 manuscript 11a.
is placed.

The position where the original 11a is placed is the feed roller 95.
Therefore, the driving range is not within which the original 11a can be ejected. Next, FIG. 8 shows a case where, for example, an A3 size original 11b is placed on the original glass 12. The position where the A3 size original 11b is placed adjacent to the fixed scale 130 is not within the driving range where the original 11a can be ejected by the delivery roller 95.

FIG. 9 is a diagram showing the paper feeding situation in the automatic paper feeding mode (ADF mode), in which the document 11 is carried into the movable cover part 57 by the sending roller 95. When the document 11 is conveyed to the document glass 12 while being pressed by the feed roller 95, the movable cover portion 57 descends onto the document 11 and comes into close contact with the document 11. After the close contact, a copying operation is started and the original image is copied onto the copy paper 31. After copying is completed, the delivery roller 95 presses the document 95 and discharges it to the outer cover portion 55 via the gate 87.

FIG. 10 is a block diagram showing control of the copying apparatus described in FIG. 1. In the same figure, the delivery roller 95
A document feed control section 141 that controls the driving of the photosensitive drum 27, and a copying section 142 that controls the cap that transfers the electrostatic latent image formed on the photoreceptor drum 27 are connected to each other, and control is performed by transferring control signals. It is done.

The document feed control section 141 includes a platen open/close switch 1
18b and encoder 143. This can also be pulse controlled using a pulse motor instead of the encoder 143. The original feed control unit 141 controls the original W4
11, when a detection signal is input from the platen open/close switch 118b, it is determined that the manual copy mode is in which the platen cover 51 remains in contact with the document glass 12. At this time, even if the originals 11 are stacked on the tray 81 and the copy button 150a is pressed, the original feed control unit 14
1 ignores the copy button and performs automatic paper feeding operation (AD
F operation) is prohibited. On the other hand, the document feed control unit 141
When the platen cover 51 is opened or closed after the copying of the original 11 is completed, the pulses input from the encoder 143 are counted, and when a predetermined time elapses, for example, about 10 seconds, which is the time required for normal copying operation, the ADF operation is enabled. The document feed control unit 141 also outputs a drive signal to a driver 145 that drives various rollers 146 such as the pickup roller 82.

On the other hand, the copy control unit 142 controls the copy button and the document 11. It is connected to an operation panel 150 that includes various switches for specifying the size of the copy paper 31, etc., and a display section that displays various messages such as "copy buttons E 1 and L 15." 142 is operation panel 1
Various drivers 14 drive various drive units 149 such as a carriage when the size, etc. of the original 11 is input from 50, etc.
8 is connected.

FIG. 11 shows an operation panel 150 provided on the device main body 1.
This shows the main parts of A copy button 150a for starting copying is provided at the lower right end in the figure, and a numeric keypad 150b is provided adjacent to this copy button 150a. On the top surface of the copy button 150a and the numeric keypad 150b, there are provided a display section 150C for displaying the operating status of each section, jams of the copy paper 31, etc., and a counter command key 150d for displaying the total number of copies and the number of columns for each color. There is. Adjacent to the counter command key 150d,
For example, in the manual copy mode, a mode display section 150e is provided on which a message such as "manual mode" is displayed by the document feed control section 141.

Next, the operation of this embodiment will be explained using FIGS. 12(a) to 12(b).

First, after the power is turned on to the apparatus, an initial rice operation is performed and the apparatus becomes ready for copying. At this time, ADF
When the operation is possible and the ready state is reached, the platen cover 51 is opened by an attendant, and the document feed control unit 141 detects the open state of the platen cover 51 by disconnection of the detection signal from the platen open/close switch 118b (step 100-110).

Original feed control unit 14 with platen cover 51 in open state
1, when switching to manual copy mode, "Manual mode 1'J" is displayed on the mode display section 150e and the ADF
Operation becomes unavailable. At this time, one document is placed in the tray 81.
1 and presses the copy button 150a, the document feed control unit 141 ignores the copy button 150a and presses the copy button 150a.
Copying in DF mode is prohibited (step 120).

When the manual copy mode is activated, the staff member will press the document glass 1.
2, and the copy button 150a is pressed to make a copy. After copying, the document feed control unit 141 controls the document 11 when the platen cover 51 is opened by the staff member.
If you do not remove it, it will remain in manual copy mode and will not accept ADF operations. On the other hand, if the staff member leaves the apparatus after the platen cover 51 is opened and the document 11 is taken out, for example, another document 11 is placed on the document glass 12, the document feed control unit 141 counts the pulse signals input from the encoder 143. The document feed control unit 141 remains in the manual copy mode for a predetermined time according to the count, for example, within about 10 seconds as the R interval required for normal copying operation, and returns to the ready state of step 100 after the elapse of time (steps 130 to 160). .

FIG. 12(b) shows step 120 in FIG. 12(a).
After the manual copy mode, the document feed control section 141
displays "manual mode" on the mode display section 150e. The other parts are the same as those in FIG. 12(a), so the explanation will be omitted.

As a result, even if the original 11 is left behind on the original glass 12, the ADF operation is prohibited, preventing the occurrence of a jam.Furthermore, the display of "manual mode" ensures that the
It is possible to notify that DF operation cannot be used.

This embodiment can prevent the complication of the device and the increase in price due to the addition of control circuits, etc.

Note that this invention is not limited to the above embodiments,
Of course, various modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As explained above, according to the present invention, the document blur
After detecting non-clamping or clamping by the power bar, driving of the document feeder/discharge device is prohibited until non-clamping or clamping is detected again, so the document can be quickly removed from the document glass without complicating the device. Can be detected.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a perspective view showing the relationship between the platen cover and the document glass, and FIG. 3 is an explanatory perspective view showing the main parts of the platen cover. Fig. 4 is a sectional view showing the main parts of the platen cover, Fig. 5 is a perspective view of the main parts of the document feeding/discharging device, Fig. 6 is an explanatory diagram of the operation, and Figs. 10 is a block diagram showing the control system, FIG. 11 is a diagram showing main parts of the operation panel, and FIG. 12 is a processing flow chart showing the operation of the present invention. 3... Original supply/discharge device 11... Original 12... Original glass 51... Platen cover 52... Separate operation unit 95... Delivery roller 118a... Platen cover opening/closing switch 118b... -Platen open/close switch 141...Document feed control section 1500...Mode display section

Claims (1)

[Scope of Claims] A document feeding and discharging device that supplies a document from a first stacking section onto a document mounting table and further discharges the document to a second stacking section; and a document placement surface on the document platform. a platen cover which is located on the side and which holds the document between the document mounting table; a detection means which detects whether the document is being held or not being held by the platen cover; An image forming apparatus comprising: a control means for prohibiting driving of the document feeding/discharging device until pinching and pinching are detected.