JPH0210338A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce weight of a cover part and to drastically lower cost by providing a document feeder which feeds a document between the platen sheet of a document presser cover and a document platen and ejects it. CONSTITUTION:When a document D is fed and ejected, a cam roller 111 rotates by 180 deg. by the projecting part 109a of a pusher 109 in order to push a slider 115. Thus, a turning lever 120 operates in such a way that the free edge of a movable frame 98 is lifted against a spring 100, and right half of the platen sheet 95 is separated from a glass 3, whereby the document D can be supplied. Then, the driving mechanism part 106 operates, pressuring operation of the slider 115 is released, and the movable frame 98 presses the document D on the glass 3 with the aid of resiliency of the spring 100. When scanning is completed, a gate 85 falls down, and the platen sheet 95 rises and moves the document D in a right direction to eject the document D to a containing part 72. Under such constitution, weight of the cover part is reduced and cost is lowered.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention has an image forming process configuration means built into the main body of the apparatus, and an image corresponding to an original set on an original platen. The present invention relates to an image forming apparatus such as an electronic copying machine, and particularly to an image forming apparatus equipped with an automatic document feeder (ADF) that automatically conveys a document to a developing table.

(Prior Art) Conventionally, in an image forming apparatus equipped with an automatic document feeder, the automatic document feeder has a wide endless conveyor belt attached to a portion of a cover that overlaps the document table, and this conveyor belt is rotated. The document feeder has a built-in belt drive mechanism, and the conveyor belt is configured to feed and set the document fed from the document feeding unit onto the document tray and eject the document from the document tray by the running of the conveyor belt. ing. Further, the cover is configured such that a portion of the cover can be opened even during document feeding and ejection operations of the automatic document feeder.

(Problems to be Solved by the Invention) However, the conventional automatic document feeder has the following problem because the cover portion includes a wide conveyor belt and a belt drive mechanism for driving the conveyor belt. That is, the cost of a portion of the cover is high, and this portion occupies more than half of the total cost of the automatic document feeder. In addition, a portion of the cover is heavy, making it difficult to open and close it. Further, since the wide conveyor belt rotates while touching substantially the entire surface of the document table, it not only requires a large amount of power and power, but also causes noise. Additionally, part of the cover may be opened inadvertently while the automatic document feeder is feeding or ejecting, which not only requires resetting the document, but may also cause serious damage such as damage to the document. There was a problem.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to significantly reduce the cost of an automatic document feeder, make it easy to open and close a part of the cover, and furthermore, it is possible to significantly reduce the cost of an automatic document feeder. To provide an image forming apparatus that requires less power and power, reduces noise, and has high operational safety in which a document holding cover does not open while an automatic document feeder is in operation.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has an image forming process configuration means built into the main body of the apparatus, and a device that supports the document set on the document table. In an image forming apparatus that forms an image, an original holding cover has a platen sheet superimposed on the original placing table, and a document is fed or ejected between the platen sheet of the original holding cover and the original placing table. The automatic document feeder is provided with an automatic document feeder that includes a document feed mechanism section that performs the following operations.

In addition, the cover lock mechanism has a structure in which the pushing tool of the gap forming means that lifts the platen sheet and forms a gap between it and the document placement table during the document feeding or ejecting operation of the document feeding mechanism also serves as a lock pawl. That is.

(Function) That is, the present invention includes a document holding cover having a platen sheet that is superimposed on the document placing table, and a document being fed into and ejected between the platen sheet of the document holding cover and the document placing table. Since an automatic document feeder consisting of a document feeder mechanism is provided, there is no need for a wide conveyor belt or belt drive mechanism in a portion of the cover, so it is possible to significantly reduce the cost of the automatic document feeder. It is lightweight and can be opened and closed easily like a normal document holding cover. Furthermore, since there is nothing that rotates and runs in contact with substantially the entire surface of the document table, large amounts of power and power are not required, and the amount of power and power required for the automatic document feeder can be reduced, and noise can be reduced. Furthermore, while the automatic document feeder is in operation, the document holding cover can be locked to prevent it from opening, thereby reliably preventing reoperation and damage to the document due to inadvertent opening.

In addition, the cover lock mechanism has a structure in which the pushing tool of the gap forming means that lifts the platen sheet and forms a gap between it and the document placement table during the document feeding or ejecting operation of the document feeding mechanism also serves as a lock pawl. Therefore, the configuration can be simplified without requiring a special locking mechanism.

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

FIG. 2 shows the internal configuration of the entire device. In the figure, reference numeral 1 denotes an apparatus main body that incorporates image forming process constituent means 2 such as charging, exposure, development, transfer, cleaning, and fixing. An automatic document feeder (ADF) 4 is provided above for setting documents and ejecting documents on the platen glass 3. Further, on the front edge of the upper surface of the main body 1, there is a numeric keypad 5.5 as shown in FIG. Information display section 6. An operation panel 8 on which a copy key 7 and the like are arranged is arranged.

On the right side of the apparatus main body 1, there are a first paper feed cassette (hereinafter referred to as an upper cassette) 15 and a second paper cassette 15 containing paper P such as plain paper to be supplied to the image forming process configuration means 2.
A paper feed cassette (hereinafter referred to as a lower cassette) 16 is installed. Furthermore, a tray 17 is installed on the left side of the apparatus main body 1 to collect fixed sheets P.

The image forming process configuration means 2 has a configuration as shown in FIG. That is, a drum-shaped photoreceptor 20 serving as an image carrier is arranged approximately in the center of the apparatus main body 1, and a charging device 2 is arranged around the photoreceptor 20 along its rotation direction.
1. Erasing device 22°, exposure section 23a of exposure device 23, developing device 24. Transfer device 25. Peeling device 26. Cleaning device 27
．． Static eliminators 28 and the like are sequentially arranged.

Further, inside the main body 1 of the apparatus, paper P5 is automatically fed from the upper cassette 15 or the lower cassette 16, or paper is manually fed via the manual paper feed tray 30 which also serves as a cover for the upper cassette 15. A paper transport path 33 is formed that guides the paper P through an image transfer section 31 between the photoreceptor 20 and the transfer device 25 to a pair of paper discharge rollers 32 provided on the left side of the main body 1 of the apparatus.

An aligning roller pair 34 is arranged on the upstream side of the image transfer section 31 of the paper conveyance path 33, and a fixing device 35 is arranged on the downstream side.

Further, in the vicinity of the installed portion of the upper cassette 15, there is a take-out roller 40 attached to a swingable arm that takes out the sheets P one by one, and a take-out roller 40 that receives the sheets P taken out through the take-out roller 40. A separation conveyance means 41 consisting of a conveyance roller and a separation roller that feeds the paper into a first branch conveyance path forming the upstream side of the paper conveyance path 30 is provided, and the manually fed paper P is separated and conveyed by the separation conveyance means 41. A manual feed roller 42 is provided that feeds the paper into the first branched conveyance path between the conveyance roller and separation roller which are spaced apart from each other.

Further, in the vicinity of the installed portion of the lower cassette 16, there is a take-out roller 43 that is attached to a swingable arm and takes out the sheets P one by one, and a take-out roller 43 that receives the sheets P taken out via the take-out paper feed roller 43. Separation conveyance means 44 consisting of a conveyance roller and a separation roller that feeds the sheet into a second branch conveyance path forming the upstream side of the paper conveyance path 33 is provided.

Further, the exposure device 23 illuminates a document set on a platen glass 3 provided on the top surface of the device main body 1 with an exposure lamp 51 whose back is surrounded by a reflector 5o, and uses reflected light from the surface of the document. 1 mirror 52. Second mirror 53. The light is guided to the lens 55 through the third mirror 54 in order, and then the light transmitted through the lens 55 is directed to the fourth mirror 5.
6. Fifth mirror 57. The light is guided to the photoreceptor 20 through the sixth mirror 58 in sequence.

The exposure lamp 51 and the first mirror 52 surrounded by the reflector 50 are mounted on a first carriage 59 that is movable back and forth along the lower surface of the platen glass 3, and
The second mirror 53 and the third mirror 54
It is mounted on a second carriage 60 that moves in the same direction at half the speed of the carriage 59, and these carriages 59
60 in the state shown in FIG. 2, by moving from the left to the right in the figure, the document sheet set on the platen glass 3 is scanned and an image corresponding to the document sheet is slit-exposed onto the photoreceptor 2o. It has become.

The developing device 24 includes a partial developing unit 61 for color developing and a lower unit 62 for black developing.
It is possible to selectively develop black or other colors such as red.

Note that the charging device 21. Eraser 22. Exposure device 23
．． Developing device 24. Transfer device 25. Peeling device 26. Cleaning device 27. Since the static eliminator 28, the determining device 35, and the like have a known configuration, detailed description thereof will be omitted.

Incidentally, the first carriage 59 is equipped with a spot unit 65 for specifying an area when copying is to be performed with the original area erased, and the erasing device 22 is equipped with a spot unit 65 for specifying the area. It is now possible to erase the charge in the area corresponding to the area specified by . Furthermore, a cooling fan 66 is arranged above the fixing device 35 in the apparatus main body 1 .

In addition, the platen glass 3'2 can be set with a maximum A3 size (leisure size for documents intended for overseas use) based on either the right scale 67 or the left scale 68, which will be described later. ing.

As shown in FIGS. 1 and 3, the automatic document feeder (ADF) 4 is broadly divided into a document holding cover (hereinafter referred to as a platen cover) that is superimposed on the platen glass 3.
70, a document tray 71 on which a plurality of documents D... can be set at once, and a platen sheet 95 and a platen glass, which will be described later, of the platen cover 70, from which the documents on the document tray 71 are taken out one by one. 3, and set the document using the right scale 67 as a reference, and after the copying operation is completed, transfer the set document to the platen cover 70.
The original document feeding mechanism 73 ejects the document from between the platen sheet 95 and the platen glass 3 and stores the document in the discharged document storage section 72.

The platen cover 70 has a hinge member 74 on the rear end side.
74 (see Fig. 3), and is attached to the main body 1 of the apparatus via the platen glass 1 as shown in Fig. 3. 3, it can be made into a polymerized state. The hinges 74, 74 can be freely pulled out upward relative to the main body 1 of the apparatus, so that even when copying thick objects such as books, the platen sheet 95 of the platen cover 70 can be kept parallel to the platen glass 3. It is pressed evenly.

As shown in FIGS. 2 and 4, the document feeding mechanism section 73 receives the documents D... set on the document tray 71.
A pick-up roller 75. is provided facing and movable up and down. Single sheet take-out means 78 consisting of a supply roller 76 and a separation roller 77. and a registration roller pair 79,
Each of these rollers is configured to be rotationally driven in a predetermined direction via a drive system (not shown). Further, the right scale 67 is rotatably mounted around the axis of the lower roller 80 of the pair of registration rollers 79, and is driven by a solenoid (not shown).

Further, a feeding roller 81 is provided at the left side of the right scale 67 and in rolling contact with the upper surface of the right end of the platen glass 3, and is selectively rotated in both forward and reverse directions by the drive system (not shown) to feed the document. It is designed to feed in and eject. In addition, in the upper part of the right scale 67,
A document discharge section 82 is formed to discharge the document discharged by the transport roller 81 to a discharge document storage section 72 formed from the upper surface of the platen cover 70 . The document ejecting section 82 is arranged to form a document ejecting path 84 between a first guide plate 83 whose lower end faces near the tip of the right scale 67 and the first guide plate 83. , a second guide plate 86 , and a pair of discharge rollers 87 disposed at the terminal end of the document discharge path 84 .

The gates 85 are rotatably attached to a horizontally suspended shaft 88, and their lower ends are inserted under their own weight into grooves 89 formed on the upper surface of the free end side of the right scale 67. It has become.

Further, the platen cover 70 is configured as shown in FIGS. 5 and 6. That is, 95 is a platen sheet formed to approximately the same size as the platen glass 3, and this sheet 95 is made of an elastic member 95a such as urethane.
A white sheet 95b with a low coefficient of friction is attached to the lower surface of the elastic member 95a, and a notch 96 (see FIG. 4) on the right end of which the feeding roller 81 is inserted.
has been formed.

Although the portion corresponding to the notch 96 cannot directly hold down the document, this portion can be pressed by the feeding roller 81, thereby reliably preventing image defects due to the lifting of the document.

Further, the rear end of the platen sheet 95 is covered with a cover body 97 attached to the apparatus main body 1 via the hinge members 74 and 74, except for the lower surface. The left end side of the platen sheet 95 is directly fixed to the cover body 97 by a fixing means (not shown), and the right half is attached to a movable frame 98 rotatably attached to the cover body 97.

99.99 shown in Figure 5 (only the front side is shown) is
It is a rotational fulcrum of the movable frame 98 and is located approximately at the center of the cover body 97 in the left-right direction.

Also, the upper surface of the free end side of the movable frame 98 (the upper surface of the right end side)
Compression springs 100, 100 as biasing bodies are disposed between and the cover main body 97, and the free end side of the movable frame 98 is always kept in a horizontal state as shown by the solid line in FIG. The entire platen sheet 95 is brought into close contact with the platen glass 3 by being biased downward.

The movable frame 98 also includes a gap forming means 10 which will be described later.
5, it is possible to rotate by a predetermined angle against the biasing force of the compression spring 100, 100, and as shown in FIGS.
As shown by the two-dot chain line in the figure, a wedge-shaped gap G having an angle θ and a length l is formed on the lower surface of the right half of the platen sheet 95.

As shown in FIGS. 5 and 6, the gap forming means 105 is connected to a drive mechanism 106 provided on the side of the document feeding mechanism section 73.
and a power transmission mechanism 107 that is provided on the platen cover 70 side and transmits the force generated by the drive mechanism 106 to the movable frame 98.

The drive mechanism 106 rotates and displaces a pusher (hereinafter referred to as a button) 109 that is rotatable about a shaft 108 in accordance with the rotation of an eccentric cam roller 111 that uses a cam motor 110 as a drive source, thereby moving the button 109. Upper end protrusion 1
09a is made to protrude and sink into the platen cover 70 side.

Note that the pusher 109 is always urged by an unillustrated urging member so as to be in contact with the circumferential surface of the eccentric cam roller 111.

The power transmission mechanism 107 has the following configuration. That is, the protrusion 109 of the butcher 109
Slider 11 with one end surface 115a facing a
5 is provided. This slider 115 is capable of reciprocating in the direction of protrusion and retraction of the protrusion 109a of the button shear 109, and the other end surface side is provided with a link mechanism 116.
The cover body 97 is connected to one end of a shaft 117 that is horizontally suspended in the space between the cover body 97 and the movable frame 98.

The shaft 117 has a guide groove 118 formed of a long hole formed in both the front and rear frame portions on the free end side of the movable frame 98.
118 (only the front frame side shown)
Rotating levers 120, 120 equipped with 19, 119 are attached. And the slider 1
15 is caused by the action of the link mechanism 116 on the shaft 11.
7, and the rotating levers 120, 120 attached to this shaft 117 are rotated by a predetermined angle.

However, in the gap forming means 105 having the above configuration,
Normally, as shown by the solid line in FIG. 6, the minimum eccentric portion of the eccentric cam roller 11 is stopped in contact with the butcher 109 and does not push the end surface 115a of the slider 115. Therefore, no force is generated to push up the free end of the movable frame 98, and the movable frame 98 is pushed down to a horizontal state by the force of the compression spring 100°100, so that the entire surface of the platen sheet 95 is exposed to the platen glass 3.
It is in close contact with.

Then, at the timing of supplying and discharging the document, the cam motor 110 is driven to rotate the eccentric cam roller 111 by 180 degrees in response to a signal from a control section (not shown), and as shown by the two-dot chain line in FIG. The eccentric portion stops in contact with the pusher 109, and the pusher 109 is rotated, and the slider 115 is pushed in by the protrusion 109a. As described above, this sliding movement of the slider 115 is converted into a rotational displacement movement of the rotating levers 120, 120, and the free end of the movable frame 98 is pushed up against the biasing force of the compression springs 100, 100.

Then, the right half of the platen sheet 95 is separated from the platen glass 3, and as shown by the two-dot chain line in FIGS. 7 and 6, on the lower surface of the right half of the platen sheet 95,
A gap G having an angle e and a length l is formed.

Further, the button shear 109 of the gap forming means 105 also serves as a lock claw 121, and a claw portion 121a formed of the protrusion 109a is located on the upper surface side of the platen cover 70 to prevent the platen cover 70 from opening. It constitutes a cover lock mechanism 122.

Note that 125 is a cover that covers the document feeding mechanism section 73, and 126 is a cover that covers a part of the gap forming means 105 protruding from the upper surface of the cover main body 97, that is, a part of the slider 115 and the link mechanism 116. be.

Next, referring to Figure 8, the automatic document feeder (ADF)
The operation of supplying and discharging original paper to the platen glass 3 by the printer 4 will be explained.

First, as shown in FIG. 8(a), the originals D, . As a result, the pickup roller 75 descends and rolls into contact with the uppermost document tray, and the pickup roller 75 and the supply roller 76 and separation roller 77 of the single sheet take-out means 78 rotate, and the uppermost document tray moves to the left. taken out. On the other hand, at this time, as described above with reference to FIGS. 5 and 6, the drive mechanism section 106 of the frame rotation means 105 serving as a gap forming means operates, and the slider 115 is pushed by the pusher 109, causing the seventh As shown in the figure, a gap G having an angle e and a length l is formed on the lower surface of the right half of the platen sheet 95.

After the tip of the original document is aligned by hitting the stopped registration roller pair 79,
By rotating 9, the conveyance continues in the left direction.

At this time, as shown in FIG. 8(b), the right scale 67 is in a previously raised state, and the gate 85 is pushed away by the document printer against its own weight. Thereafter, the document is conveyed to the left on the platen glass 3'' by the rotation of the feed roller 81. At this time, even if the document to be conveyed is longer than the length l of the gap G, the front end (left end) side of the paper P is Due to its stiffness, it smoothly enters between the platen sheet 95 and the platen glass 3 and does not bend.

Then, after the rear end (right end) of the document sheet is conveyed to a position slightly leftward from the tip of the right scale 67, the document sheet is conveyed to the right by the reverse rotation of the feeding roller 81, and The feeding roller 81 stops with the right end of the original document abutting against the right scale 67, as shown in FIG.

After this, as shown in FIG. 8(d), the drive mechanism section 106 of the gap forming means 105 operates again to push the button shear 1.
The pressing operation of the slider 115 by 09 is released, and the movable frame 98 to which the right half of the platen sheet 95 is attached moves to a horizontal state due to the restoring force of the compression springs 100 and 100, and is positioned with respect to the right scale 67. The prepared original is brought into close contact with the platen glass 3.

In this way, when the document tray is completely set, the document is scanned by the exposure device 23 (see FIG. 2) in the main body 1 of the apparatus. When this document scanning is completed, the right scale 67 descends, as shown in FIG. 8(e).
The gate 85 is lowered by its own weight, and the platen sheet 95 is raised to form a gap G.

Then, the feeding roller 81 rotates to transport the document to the right, and the document is guided to the document discharge path 84 by the action of the gate 85, and then, as shown in FIG. 8(f), The document is discharged to the discharge document storage section 72 via a pair of discharge rollers 87 . Then, as shown in FIG. 8(g), the rear end of the document to be discharged to the discharge document storage section 72 is held at the discharge roller pair 87.
8(a) and 8(b) is started. c)～
The operation (g) will be performed.

In this way, all the originals D on the original tray 71...
When the copying operation is performed and the document is stored in the ejected document storage section 72, as shown in FIG. 8(h), the platen sheet 95
is lowered to become a normal platen cover 70.

9 to 13 are illustrations showing the operating state of the automatic document feeder 4, and FIGS. 9 and 10 sequentially show how the platen sheet is lifted and the document sheet is pushed into the gap G, and FIGS. FIG. 11 shows the document set on the platen glass with the right scale as a reference. Also,
FIG. 12 shows how the original is discharged onto the platen glass, and FIG. 13 shows how the original is discharged to the discharged original storage section.

Next, the copying operation of a document set on the platen glass 3 by the automatic document feeder (ADF) 4 will be explained with reference to FIG. In synchronization with the document setting operation by the automatic document feeder 4 described above, the drum-shaped photoreceptor 20 rotates in the direction of the arrow (clockwise), and the photoreceptor 20 is uniformly charged by the charging device 21 . Next, the first carriage 59 on which the exposure lamp 51 and the first mirror 52 of the exposure device 23 are mounted, and the second carriage 60 on which the second mirror 53 and the third mirror 54 are mounted are mounted on the lower surface of the platen glass 3. Move from left to right in the figure.

Then, when the first carriage 59 carrying the exposure lamp 51 and the first mirror 52 reaches a position slightly to the left of the middle part, the exposure lamp 51 is turned on and the original set on the platen glass 3 is scanned and exposed. A slit is exposed onto the body 20. Then, an electrostatic latent image corresponding to the original is formed on the photoreceptor 20.

This electrostatic latent image on the photoreceptor 20 is transferred to the upper developing unit 61 of the developing device 24 based on the color designation from the operation panel 10.
Alternatively, it is developed and visualized by the lower developing unit 62.

Meanwhile, in synchronization with this developer image forming operation, the paper P1 automatically taken out from the upper cassette 15 or the lower cassette 16, or the paper P manually fed from the manual paper feed tray 30, is fed through the aligning roller pair 34. The developer image formed in advance on the photoreceptor 20' is transferred to the paper P by the action of the transfer device 25.

Next, the paper P is peeled off from the photoreceptor 20 by the peeling device 26 and sent to the fixing device 35 via the paper conveyance path 33, where the developer image is melted and fixed on the paper P, and then the paper P is removed by the paper ejection roller. It is discharged via the pair 32 and stored in the tray 17.

After the developer image has been transferred onto the paper P, the photoconductor 20 is faced to a cleaning device 27 to remove residual developer (residual toner), and then faced to a static eliminator 28 to remove the remaining developer (residual toner) from the photoconductor 20. 20 is irradiated with light to remove the electrostatic memory and return to a normal state in which the next copying operation is possible.

In this way, the copying operation is performed until the originals D... on the original tray 71 are exhausted.

Further, a large A3 size document tray or a manual set document tray is set by opening the platen cover 70 and setting the left scale 68 as a reference, as shown in FIG. At this time, since the cover lock mechanism 122 does not use the automatic document feeder 4, the document holding cover 70 can be opened and closed freely.

[Effects of the Invention] As explained above, according to the present invention, there is a document holding cover having a platen sheet superimposed on the document placing table, and a space between the platen sheet of the document holding cover and the document placing table. Since the automatic document feeder is equipped with a document feeding mechanism that feeds and ejects documents, there is no need for a wide conveyor belt or belt drive mechanism in the cover, which significantly reduces the cost of the automatic document feeder. In addition to reducing the weight of a portion of the cover, the cover can be opened and closed easily in the same way as a normal document holding cover.

Moreover, since there is no rotating object in contact with almost the entire document table, there is no need for a large amount of power or power, which reduces the amount of power and power required for the automatic document feeder, and reduces noise by one function. Become. Further, the document holding cover can be locked to prevent it from opening while the automatic document feeder is in operation, thereby reliably preventing reoperation and damage to the document due to inadvertent opening.

In addition, the cover lock mechanism has a structure in which the pushing tool of the gap forming means that lifts the platen sheet and forms a gap between it and the document placement table during the document feeding or ejecting operation of the document feeding mechanism also serves as a lock pawl. As a result, the structure can be simplified without requiring a special locking mechanism.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic perspective view showing the appearance of the upper part of the image forming apparatus with the platen cover of the automatic document feeder partially closed, and FIG. 2 shows the image forming apparatus. A schematic longitudinal sectional front view of the entire apparatus, FIG. 3 is a schematic perspective view showing the appearance of the upper part of the image forming apparatus with the platen cover of the automatic document feeder partially open, and FIG. 4 shows a document of the automatic document feeder. FIG. 5 is a perspective view schematically showing the configuration of the feeding mechanism section, FIG. 5 is a perspective view schematically showing the gap forming means that also serves as a platen cover and cover locking means, and FIG. 6 is a perspective view schematically showing the gap forming means that also serves as the cover locking means. A schematic configuration diagram of the means, FIG. 7 is an explanatory diagram showing a gap forming state, FIG. 8 is an explanatory diagram of the operation of the automatic document feeder, and FIGS. 9 to 13 similarly show the operating state of the automatic document feeder. The illustrated figure, FIG. 14, is a perspective view showing a state in which a document tray is set when a document is set manually. DESCRIPTION OF SYMBOLS 1... Apparatus main body, 2... Image forming process forming means, 3... Document mounting table (platen glass), 4... Automatic document feeder (ADF), 70... Document holding cover (platen) cover) 73...original feeding mechanism section, 9
5...Platen sheet, 121...Lock claw, 12
1a...Claw portion, 122...Cover lock mechanism, D.
...Manuscript. Applicant's agent Patent attorney Suzue Takehiko's funeral map Figure 11

Claims (2)

[Claims] (1) In an image forming apparatus that has an image forming process configuration means built into the apparatus body and forms an image corresponding to a document set on a document table, the document has a platen sheet that is superimposed on the document table. A presser cover, a document feeding mechanism section that feeds and ejects a document between the platen sheet of the document presser cover and the document table, and a document feeder mechanism section that feeds and ejects a document between the platen sheet and the document table of the document presser cover; An image forming apparatus comprising an automatic document feeder including a cover lock mechanism that locks the document holding cover so that it does not open. (2) The cover lock mechanism doubles as a lock pawl as a push tool of a gap forming means that lifts the platen sheet and forms a gap between it and the document placement table when the document feeding mechanism unit feeds or discharges the document. An image forming apparatus according to claim 1, wherein the image forming apparatus has the following configuration.