JPH04138471A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate the need of a notched part for preventing an interference with a feeding roller on a platen sheet by vertically moving and advancing/ retreating a platen sheet pressing an original and vertically moving the feeding roller feeding the original on a platen glass. CONSTITUTION:The platen sheet 6 is attached so as to be vertically moved by a moving means 51, which is shown by the arrow A - B, and so as to be horizontally moved by an advancing/retreating means 61, which is shown by the arrow C - D, with respect to a platen cover 5 as a covering member, and a thin part 6a is formed on the top surface of one side of the side of the arrow D. When copying is carried out, the platen sheet 6 is moved in the directions of the arrow B and D, to move the thin part 6a of its top end part and the original is pressed on the platen glass 3. Before it, the feeding roller 11 is moved in the direction of the arrow F, and removed from the platen glass 3. Thus, the platen sheet 6 does not interfere with the feeding roller 11, so that it is unnecessary that the notched part for avoiding the interference with the feeding roller 11 is provided.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus such as an electronic copying machine, and particularly relates to an image forming apparatus such as an electronic copying machine, and particularly to an image forming apparatus that automatically feeds originals one by one onto an original platen. Automatic document feeder (hereinafter referred to as BL-DF) as a feeding means
The present invention relates to an image forming apparatus having:

(Prior Art) FIG. 9 shows an example of a document table of an electronic copying machine as a conventional image forming apparatus. In the figure, a platen glass 3 serving as a document table on which a document is placed is provided on the top surface 2 of a main body 1 of the copying machine.

One side of a platen cover 5 as a covering member is rotatably attached to the rear side of the upper surface 2 via a hinge 4, and by tilting the platen cover 5, the re-platen glass 3
It is designed to cover the entire surface. Further, a platen sheet 6 as a plate-shaped movable member is attached to the inner surface of the platen cover 5 so as to be movable up and down.
presses almost the entire surface of the platen glass 3 to hold the original.

A BL-DF 7 is attached to the right side of the upper surface 2 of the main body 1 adjacent to the rear side where the platen cover 5 is provided, and a feed roller portion 8 is provided at the portion where the BL-DF 7 contacts the platen glass 3. It is being Also, the feed roller section 8
A feed roller (not shown) is provided therein to send out documents (not shown) fed one by one from the BL-DF 7 onto the platen glass 3. A notch 9 is formed in the platen sheet 6 to avoid interference with the feed roller section 8.

(Problems to be Solved by the Invention) As described above, in the conventional copying machine, the platen sheet 6 has the notch 9, so the platen sheet 6 cannot sufficiently press the document in this part. There was a risk that a shadow in this area would appear on the copy paper. This tendency was particularly strong when the thickness of the original was thin.

The present invention has been made in view of the above points, and has the following objects: (1) to provide an image forming apparatus that can perform good copying without being affected by the feed roller that feeds the original onto the document table; do.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a covering member that covers a document table on which a document is placed, and a cover member that is provided between the covering member and the document table. riJ moving part shrine attached to +1J function that moves the position where the document table is pressed and the position where the pressure is released while covered, and the document table.
A feed-out roller that feeds the original held between the document table and the document table +4, and an image JI related to the image of the document sent to the document table by this feed-out roller.
4. In each image forming apparatus equipped with an image forming means for forming an image on a holding member, a moving means for moving the movable member between the pressing position and the pressing release position with respect to the document table; an advancing/retracting means for advancing and retracting between a first position and a second position between the feed roller and the document table; Furthermore, the present invention is characterized in that it is provided with a roller operation means for moving the delivery roller in a direction away from the document table when the advancing and retracting means advances the movable member to the first position.

(Function) According to the above configuration, when feeding or ejecting a document to or from the platen glass, the platen sheet is raised and separated from the first position between the feed roller and the platen glass, and when copying The delivery roller may be spaced apart from the platen glass and the platen sheet may be moved and inserted into a first position below the delivery roller. Therefore, since the platen sheet and the delivery roller do not interfere with each other, there is no need to provide a platen sheet cutout.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 8.

In these figures, parts corresponding to those in the conventional example shown in Fig. 9 are indicated by the same reference numerals (=t), and the explanation thereof will be omitted as appropriate. In Figs. 1 and 2, the movable members are The platen sheet 6 is formed into a rectangular plate shape,
The size is such that it can cover almost the entire surface of the platen glass 3 serving as a document table.

Further, the platen sheet 6 is attached to the platen cover 5 as a covering member so that it can be moved up and down as shown by arrows A-B by a moving means 51, which will be described later, and can be moved left and right as shown by arrows C-D by an advancing and retracting means 61. , on one side of the arrow.
A thin wall portion 6a is formed on the two sides. Note that when the right end of the platen sheet 6 in FIG. 1 is moved up and down, the entire platen sheet 6 is tilted and moved toward and away from the platen glass 3 (original). Further, near one side of the platen glass 3 on the BL-DF 7 side, a feed roller 1, which will be described later, is provided.

When the document is fed to and ejected from the platen glass 3 by the BL-DF 7, the platen sheet 6 moves in the directions of arrows C and A from the first position between the platen glass 3 and the delivery roller 11. Detach and release roller 1
The delivery roller 11 moves in the direction of arrow E and comes into contact with the platen glass 3.

Also, during copying, the platen sheet 6 moves in the directions of arrows B and D, and the thin section 6a at the tip moves from the second position to the first position.
Move to the position, press the original onto the platen glass 3,
Prior to this, the delivery roller 11 moves in the direction of arrow F and separates from the platen glass 3. Note that FIGS. 1 and 2 show the state during feeding and discharging of original documents.

The configuration of the BL-DF7 is shown in FIGS. 3 and 4.

A document storage section 13 is provided on the opposite side of the substrate 12 of the BL-DF 7 to the platen glass 3, and a pickup roller 1 is provided on the substrate 12 in order toward the platen glass 3.
-4, paper feed roller] 5, separation roller 16, and registration roller pair 17, each supported by parallel shafts. The pickup roller 14 is supported by a support shaft (not shown) and can swing in the direction of the arrow G-H, and comes into contact with the upper surface of the originals (not shown) stacked in the original storage section 13.
Import the originals one by one.

The paper feed roller 15 and the separation roller 16 are supported by parallel shafts and are in contact with each other, and separate the originals sent by the pickup roller 14 one by one and transfer them to a pair of registration rollers.]
7. The registration roller pair 17 aligns the fed document in a predetermined posture and sends it to the document table 2.

At the end of the BL-DF7 on the platen glass 3 side, there is provided a paper ejection guide path 18 curved toward one side for guiding the v1 degree papered original to the outside. A Mylar 19 is attached that allows the fed original to pass to the left side in the figure and guides the ejected original to a paper ejection guide path 18. Further, a paper ejection roller 20 is provided at the upper end of the paper ejection guide path 18 to send out the ejected original to the outside. Furthermore, a stopper 21 for positioning the trailing edge of the document fed onto the platen glass 3 is installed at the paper feed/discharge port at the lower left end of the BL-DF7 so as to be able to swing in the direction of the arrow J-. Reference numerals 22, 23, and 24 in FIG. 3 are a registration sensor, a paper discharge sensor, and a paper feed/discharge guide, respectively.

On the other hand, the BL-DF 7 is provided with two shafts 25 and 26 parallel to the shafts supporting the respective rollers, and a pair of arms 27 are fixed to the shafts 26. Further, the arm 27 rotatably supports both ends of a support shaft 28 to which a pair of delivery rollers] 1 are attached. Further, the support 26 is rotated by a pulse motor 31 via gears 29 and 30,
Depending on the rotation angle of the pulse motor 31, the arrow L of the arm 27
The swing angle in the M force direction is determined.

In addition, shaft 26, arm 27, support shaft 28, gear 29.30
, pulse motor 3] constitute a roller operating means 1]a for operating the vertical movement of the delivery roller 11.

A pulley 32 is fixed to the support shaft 28, and the pulley 32
A bridge 33 is rotatably provided on the shaft 26 at a position corresponding to the shaft 26 and is locked against movement in the axial direction. A timing belt 34 is stretched roughly between the pulleys 32 and 33. Similarly, a timing belt 36 is also stretched between a pulley 35 fixed to the shaft 25 and a pulley (not shown) fixed concentrically to the pulley 33. When the shaft 25 is rotated by a motor (not shown), the delivery roller 11 is rotated.

The moving means 51 and advancing/retreating means 61 will be explained to the next customer mainly with reference to FIGS. 4 and 7.

First, the moving means 51 is provided at one end 6b of the platen sheet 6 where the thin wall portion 6a is formed, and passes the platen cover 5 back and forth N, and moves the movable drive shaft 52 supported by the rotation eye 71 by H. There is. This support 52 has a pair of moving levers 53 provided opposite to the side surfaces of the platen sheet 6.
One end of 53 is fixedly removed. Also,
The other end of the moving lever 53 is slidably fitted into a long hole 6c formed in the platen sheet 6 via a pin 54.

Furthermore, this moving drive shaft 52 is rotated by a moving pulse motor 57 via gears 55 and 56, and by controlling the rotation angle of the pulse motor 57, the thin wall portion 6a of the platen sheet 6 is rotated by a moving pulse motor 57 via gears 55 and 56. The press-contact and separation operations are performed in the direction of arrow A-B.

The advancing/retracting means 61 is provided near the other end 6d of the platen sheet 6 on the opposite side from the thin wall portion 6a.

The advancing/retracting means 61 has a pair of belt drive bodies 62a, 62b parallel to the side surface of the platen sheet 6, and the timing belt 64 is moved along the arrow C- Drive in direction D.

Further, these timing belts 64 are provided with guide blocks 6
5 are fixed, and each guide block 65 is slidably held and guided by a guide body 66 provided parallel to the timing belt 64.

On the other hand, on the other end portions 6d of the platens 1 and 6, advance/retreat drive pins 67 are protruded from the outside of both sides facing the guide block 65, and are rotatably fitted into the guide body 65.

The platen sheet 6 is moved forward and backward by the rotation of a forward and backward pulse motor (not shown) that drives the forward and backward drive shaft 63, and by controlling the rotation angle, the platen sheet 6 is moved along the arrow C--D.
Directional position control is performed.

Next, the operation of this embodiment will be explained with reference to FIGS. 5 to 8. In FIG. 5, the originals 40 stacked and stored in the original storage unit 13 are taken in one by one by the pickup roller 14 as they descend in the direction of arrow H, and are reliably separated into sheets one by one by the paper feed roller 15 and separation roller 16. and is sent to a pair of registration rollers 17. The original 40 has a pair of registration rollers 17
After the front ends were aligned and aligned, Mylar 10
is pushed up and moved to the left by the rotation of the pair of registration rollers 17. In this state, the roller operating means 11. a
The feed roller 11 is pushed up in the direction of arrow F, and the platen sheet 6 is moved by the moving means 51 and the advance/retreat means 61.
, it is moving in the directions of arrows C and A, has left the first position between the delivery roller 11 and the platen glass 3, and has moved to the second position.

When the rear end of the document 40 passes through the pair of registration rollers 17, the feed roller 11 descends as shown by arrow E, presses the document 40 onto the platen glass 3, and moves to the left by the rotation of the feed roller 1. let

When the rear end of the document 40 moves a predetermined distance away from the position of the stopper 21, the rotation of the delivery roller 11 stops.

Next, as shown in FIG. 6, the stopper 21 rotates in the direction indicated by the arrow N, and its tip abuts against the upper surface of the platen glass 3. After that, the feed roller 11 starts rotating in reverse, and the rear end of the document 40 is pressed against the stopper 21 to align it. When the alignment is completed, the rotation of the delivery roller 11 is stopped and the roller operating means], 1. a to raise it in the direction of arrow F.

Next, as shown in FIG. 7, the platen sheet 6 moves in the direction indicated by the arrow at the document pressure release position, inserts the thin portion 6a into the first position below the feed roller 11, and then moves to the direction indicated by the arrow B. direction and presses the original 40 onto the platen glass 3. In this state, the platen sheet 6 presses the entire surface of the document 40 against the platen glass 3''. Copying is then performed. Note that since the image forming means is a generally known means, description and illustration thereof will be omitted.

When copying is completed, as shown in FIG. 8, the platen sheet 6 rises, separates from the original, releases the pressure, and then moves in the direction of arrow C from the first position below the feed roller 1. break away. Thereafter, the feed roller 11 is lowered in the direction of arrow E and brought into contact with the document 40 on the platen glass 3.

Then, the feed roller 11 is rotated in the reverse direction, and the document 40 is guided by the Mylar 19 and fed into the paper discharge guide path 18. The document 40 fed into the paper ejection guide path 18 is ejected to the outside by a paper ejection roller 20.

According to this embodiment, the feed roller 1 is placed on the platen sheet 6.
There is no need to form a notch to prevent interference with 1.
Since the entire document can be covered, even when copying a thin document 40, there will be no shadow from the notch, and good copies can be made.

〔Effect of the invention〕

As described above, according to the present invention, the platen sheet that presses the original onto the platen glass of an image forming apparatus can be moved up and down and forward and backward, and the delivery roller that sends out the original onto the platen glass can be moved up and down. Therefore, there is no need to form a notch in the platen sheet to prevent interference with the delivery roller, and good copying can be performed.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic configuration of essential parts of an embodiment of the present invention, FIG. 2 is a perspective view, FIG. 3 is a cross-sectional view showing the configuration of a document feeding means, and FIG. FIGS. 5 to 8 are perspective views showing the structure of the document feeding means and moving means, and FIGS. FIG. 1 is a perspective view showing the upper part of an example of an image forming apparatus. 3... Original table 5... Covering member 6... Movable member 7... Original feeding means (BL 1... Sending roller 1a... Roller operation means 0... Original 1...・Transportation means 1...Movement means DF)

Claims (1)

[Claims] A covering member that covers a document table on which a document is placed, and a position and pressure at which the document table is pressed while covered by the covering member between the covering member and the document table. a movable member mounted so as to be movable between the document table and the movable member; a delivery roller that feeds the document held between the document table and the document table; In an image forming apparatus comprising an image forming means for forming an image on an image carrier in relation to an image of a document fed onto a document table, the movable member is moved to a pressing position and a pressing release position relative to the document table. a moving means for moving the movable member between the feed roller and the document table; a moving means for moving the movable member back and forth between a first position between the feed roller and the document table and a second position other than the first position; A roller operating means is provided for moving the member to the pressure release position and for moving the feed roller in a direction away from the document table when the advance/retreat means advances the movable member to the first position. image forming device.