JP3366965B2 - Image forming device - Google Patents

Description

Detailed Description of the Invention

[0001]

When present invention relates it is for opening and closing an image forming apparatus constituting the upper frame and the lower part frame body split capable,
Each provided a connecting gear and said upper frame and the lower section frame body, and the connection between the image forming unit in the images forming apparatus and a driving unit of the main body, an image forming apparatus that can smoothly coupled.

[0002]

2. Description of the Related Art Generally, in an image forming apparatus such as a copying machine or a printer, an image forming unit having a document exposing portion at an upper position centering on an image carrier and a developing device for forming an image on the image carrier. And has a paper feeding device for feeding recording paper, a transfer electrode, a separation electrode, etc. at the lower position.
The recording paper passes between the image carrier and the transfer / separation electrodes to transfer the image, and is conveyed to a fixing device to fix the image.

[0003] At this time, it is sufficient recording paper always smoothly conveyed sheet feeding but, when conveying the recording sheet is Tsu Do jam state
It must be retrieved from the device and the recording paper. Therefore, in order to open the feeding path for feeding and feeding the paper, the upper frame of the apparatus main body is divided by opening the other side upward with the side of the lower frame as a fulcrum so that the jammed paper can be taken out. . For example, Japanese Patent Laid-Open No. 63-138360 is known.

Further , in the image forming apparatus, the apparatus is composed of an image forming unit including an image carrier which is detachably provided, and a plurality of drive units provided in the image forming apparatus main body and the image forming unit. As a device for forming an image by combining with a plurality of driven parts provided, an actual open-circuit 58-103 is disclosed.
047, JP-A-58-19935, JP-A-62-65049, and JP-A-1-199022 are known.

[0005] While a method of dividing open an image forming apparatus main body is taken out of the jammed sheet is used as described above, the recording paper General <br/> is fed from the side of the apparatus main body, an image bearing The body image is transferred and conveyed to a fixing device provided on the other side to obtain a copied image. As described above, open the other with the side as the fulcrum.
When the recording paper is released, for example, in the copying machine, when the recording paper is jammed at the lateral fulcrum position in the copying machine configured as described above, it is extremely difficult to take out the recording paper . Therefore by dividing opening the front of the upper frame body of the image forming apparatus as a fulcrum to-Shi Okugawa the lower frame, it proposes a means of easily retrieve open to recording paper all sheet transportation path Japanese Patent Application No. 4-1196
There is number 46.

When the rear side is used as a fulcrum and the front side is divided and opened as described above, the opening operation is easy and the jammed paper can be easily taken out. However, as described above, the recording paper is conveyed to the other side from the side with respect to the image forming apparatus main body, and the fixing roller and the like used for the rotation of the paper feeding device and the image carrier and the fixing device are all the above-mentioned. It is installed in correspondence with the recording paper conveyance direction . Therefore, the drive gear that drives the device installed corresponding to the recording paper is the one whose rotation shaft is
In many cases , the direction is provided at a right angle to the transport direction on the mechanism and near the fulcrum position, that is, on the back side . Well
Further, since the apparatus main body is divided as described above, for example, when a drive source is provided in the lower frame body , the driven gears as well as the driving gears for operating the devices installed in the lower frame body and the upper frame body are operated. Must be provided separately.

As described above, in the front opening / closing type image forming apparatus
Is preferable in the direction in which the separately formed drive gear and driven gear are disengaged from each other, but there is a problem when the copying operation is started by closing the split open state . That is, the upper frame
When closing the body, the upper frame teeth against the lower frame gears.
Since the car mate came down tilted from the back above, there is no problem if someone engage in a state in which the tooth tip and the tooth root is match case, the addendum and the addendum
If bets are abutting state, if example thereof remain closed line operation,
The tooth tip of the gear on the upper frame is the tooth tip of the gear on the lower frame.
Since it is provided near the fulcrum position as described above, a large pressing force is applied by the lever action and the tooth tip edge
The parts are damaged and the image forming apparatus cannot be used.

Also, the upper frame draws an arcuate trajectory and descends.
Therefore, the tooth tip edge part of the gear of the upper frame is the lower frame.
From contacting the tip of the body gear until it meshes properly
In addition, since the phase is horizontally shifted between the two gears,
Rubbing between them will cause gear wear and damage.
There are cases.

[0009]

SUMMARY OF THE INVENTION The present invention has been particularly conceived in order to improve the above-mentioned drawbacks, and a connecting gear of the upper frame is provided until just before the upper frame of the image forming apparatus is closed.
Separate the connecting gears of the lower frame so that the gears contact each other.
When the upper frame and the lower frame are almost parallel,
To provide an image forming apparatus configured to
is there.

[0010] That is, in <br/> Okona cormorants image forming apparatus jam open from the front position, are intended to be in easy single structure, to achieve consistently good copying operation.

[0011]

The objects of the present invention can be achieved by the following constitutions.

(1) An openable upper frame and a lower frame
Is configured to be split, and the upper frame body and the lower frame body
Each has a connecting gear, and at least one
The connecting gear of the swaying gear to the upper frame or the lower frame.
The swing plate is pivotally supported by a swing plate that is movably held, and the swing plate is
The two connecting gears are urged in a direction to mesh with each other,
The upper frame is closed and the connecting gears are engaged with each other.
A gear that regulates the meshing of the connected gears when combined
The regulating member is the connecting tooth of the upper frame and the lower frame.
In the image forming apparatus provided close to the vehicle, the swing plate
Provided on the other frame body that is opposite to the one frame body that supports
The gear control member that is installed
It is formed so that it is located on the outer periphery of the
The upper frame is opened by bringing it into contact with the cam member.
When closed, the one of the ones attached to the rocking plate
Characterized by being configured to displace the position of the connecting gear
Image forming apparatus.

(2) The upper frame body is a main body of the image forming apparatus.
It is characterized in that it can be divided and opened from the surface
The image forming apparatus according to (1).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of the entire image forming apparatus.
In the front cross-sectional view shown, 1 is a photosensitive drum, 2 is a charging electrode for applying a constant charge to the entire surface of the photosensitive drum 1, 3 is a developing device having a toner replenishing section 4, and 5 is the photosensitive drum 1. The cleaning device is provided with a cleaning blade 6 for removing the residual toner. The above devices are integrally manufactured, and are detachably attached to the upper frame 7a of the image forming apparatus 7. Further, a document table glass plate 8 which is a fixed document table for placing a document on the upper frame 7a, and a document retainer for holding the document when the document D is placed on the document table glass plate 8 A plate 9, an exposure lamp 10 that moves to a lower position of the original platen glass plate 8 in the upper frame 7a by guide rails (not shown), respectively, to a position indicated by an alternate long and short dash line, and the exposure lamp 1
0 and the first reflecting mirror 11 that moves integrally with the original D
The reflected light emitted from the exposure lamp 10 is received by the first reflection mirror 11, and the reflected light is received by the fixed focal length lens 1
2 (hereinafter referred to as an image forming lens) which is integrally formed with second and third reflecting mirrors 13 and 14 formed at 90 °, and further irradiates the surface of the photosensitive drum 1 to form an electrostatic latent image. A fourth reflecting mirror 15 for forming is provided.

Reference numeral 16 denotes an exhaust fan for discharging ozone and heat generated in the image forming apparatus 7 to the outside.
7 is provided to discharge the toner scattered from the developing device 3 from the suction port 17 and the ozone generated from the band electrode 2 to the outside through the ozone removal filter 18. On the other hand, the suction port 19 formed in the light blocking plate 7b for blocking the optical system
It discharges the heat of the exposure lamp 10 for generating the more the optical system to the outside. The reflecting mirrors 13 and 14 which are 90 ° with respect to the moving distance of the first reflecting mirror 11 are moved by a guide member (not shown) at a distance of ½ so that the optical path length between the original D and the surface of the photosensitive drum 1 is always maintained. Is constant. All the above mechanisms are provided in the upper frame 7a.

Reference numeral 20 denotes a paper feed cassette which is provided at a lower position of the lower frame body 7c of the image forming apparatus 7 and stores the recording paper P.
The recording paper P provided in the paper feed cassette 20 is a spring 2
1, the front portion in the sheet feeding direction is pushed up via the pressing plate 22, the uppermost recording sheet P is fed by the half-moon-shaped sheet feeding roller 23, and the recording sheet is conveyed by the conveying roller 24 and the conveying guide section 25. P is conveyed to the paper feed conveyance guide unit 26. The recording paper P is temporarily stopped by the recording paper stop member 27 in the paper feeding / conveying guide portion 26, and the paper feeding is started so as to coincide with the toner image formed on the surface of the photosensitive drum 1, and recording is performed by the transfer pole 28. The toner image is transferred onto the paper P, separated from the surface of the photosensitive drum 1 by the separation pole 29, fixed by the thermal fixing device 30, and then discharged onto the discharge tray 31. Reference numeral 32 denotes a manual feed tray, which is a paper feed roller 33 for manual feeding, and the recording paper P on the manual feed tray 32.
The sheets 1 are fed one by one to the sheet feeding / conveying guide section 26.
S1 and S2 are sensors provided in the conveyance guide unit 25 for the recording paper P and the paper feed conveyance guide unit 26.

The upper frame body 7a and the lower frame body 7c are axially fixed by a shaft (not shown) so that they can be opened from the front side about the shaft.

FIG. 2 is a side view of the image forming apparatus 7 when it is opened. The upper frame 7a can be opened at an angle θ1 of the front side 7e around the support shaft 7d provided at the back side of the image forming apparatus 7. Is configured. Reference numeral 7f is a lock claw provided on the upper frame body 7a, and locks the upper frame body 7a to the lower frame body 7c. A damper 7g and an auxiliary support member 7h are provided between the lower frame body 7c and the upper frame body 7a to maintain the opening operation.

FIG. 3 shows a drive unit (reference numeral) of the image forming apparatus 7.
No connection number) shows the connection state of the connection gear according to the present invention.
In a side view, the gear holding frame 3 provided in a part of the lower frame body 7c
5 is a connecting gear 3 driven by a motor (not shown)
6 , 37 , 38 are fixed to the core shafts 39 , 40, respectively, and the connecting gears 37 , 38 are meshed with each other, and the connecting gear 38 is provided on the core shaft 40.
Gear control members 41 , 42 are provided so as to be coaxial with and sandwich the connecting gear 38. In particular, the gear restriction member 42 is formed to have a diameter larger than the tip of the connecting gear 38. As shown in FIG. 5, the upper frame 7a is provided with a rocking plate 44 that can rock around a central shaft 43, and a connecting gear 45 is rotatably mounted on the central shaft 43. A connecting shaft 47 fixed to the shaft 44 is connected to a connecting gear 47 which is constantly meshed with the connecting gear 45.
Is rotatably provided, and the connecting gear 47 is attached to the connecting gear 38 by , for example, an elastic body (not shown) or its own weight.
Due to this, they are always in mesh.

Then, as shown in FIG. 3, the gear regulating member 4
1 is locked with a regulation surface 44A formed on the swing plate 44.
And a cam member fixed to one end of the one-sided shaft 46
A part of the cam surface 48A formed on the gear 48 is the gear regulating member.
It is locked to 42. The rocking plate 44 is thus positioned
The teeth of the connecting gear 38 and the connecting gear 47 are
The tip always meshes at an appropriate interval.

Numeral 49 is a protrusion provided on a fixing plate 50 that is adjustably fixed to a part of the upper frame 7a, and is fixed to the gear holding frame 35 by closing the upper frame 7a as shown in FIG. It fitted into the positioning holes 52 of the fixed frame 51, in particular a gear holding frame 35, the position of the upper frame 7a is correctly held
It

FIG. 4 shows a state before connecting the connecting gears in FIG.
In side view showing a state, the upper unit frame 7 as shown in FIG. 2
It is a figure for demonstrating the effect | action of the said cam member 48 in order to carry out the separation coupling | bonding of the connection gearwheels 47 and 38 of FIG. 3 smoothly, when a is opened and closed with respect to the lower frame 7c. Figure 5
3 is a front view showing a connected state of a connecting gear in FIG.

The upper frame 7a is opened with respect to the lower frame 7c,
Or, when closing , the rocking plate is accompanied by the opening of the upper frame 7a.
44 is moved by being biased by the elastic body or the like. The core
The cam surface 48A of the cam member 48 provided on the shaft 46 is a gear.
By moving the outer peripheral surface of the regulating member 42 , the swing plate 4
Immediately rotate the 4 around the central axis 43. others
Therefore, immediately after the upper frame 7a is opened, the connecting gears 47, 3
8 is in a state where a gap is formed between the tooth tips.

Even in the closing operation of the upper frame 7a, the tooth tips are held in a separated state until just before the connecting gears 47 and 38 are engaged with each other, and when the closing operation is completed, the projection 49 is fitted into the positioning hole 52 and connected. The gears 47, 38 also mesh. And said coupling gear portions of the regulating surface 44A and the cam surface 48A of the rocking plate 44 as before mentioned are each regulated to the gear regulating member 41, 42 4
The tooth tips of Nos. 7 and 38 are held in a predetermined combined state.

According to this embodiment, the upper frame 7a is closed.
Just before twisting, the connecting gear 47 of the upper frame 7a and the lower frame
When the connecting gear 38 is separated from each other and the mutual gears come into contact with each other.
The upper frame 7a and the lower frame 7c are almost parallel to each other.
And the edge of the connecting gear is the connecting tooth.
To press or scratch the tooth crests of the car 38 strongly
There are no teeth, and the tips are in contact with each other, so two connecting teeth
Car damage and wear can be prevented.

Further, when the upper frame 7a is closed, the protrusion
By connecting the portion 49 and the positioning hole 52,
The gear meshing condition is kept constant and stable as designed.
It becomes possible to transmit power.

[0027]

As described above, the present invention is an image forming apparatus that can be divided into an upper frame and a lower frame, and has a structure in which the front side is opened with the back side as a fulcrum, and the connecting gear is also the upper frame body. ,
Drive mechanisms that are separately arranged on the lower frame, and when the split opening and closing operations are performed, the tooth tip coupling of the connecting gear is always kept in an optimum state, so a particularly large load is applied. Even if it is received by the connecting gear, smooth driving can be performed, so that in the image forming apparatus, the photosensitive drum and the developing device can always be operated smoothly and a good image can be obtained.

[Brief description of drawings]

FIG. 1 is a front sectional view of an image forming apparatus according to the present invention.

FIG. 2 is a side view in which the image forming apparatus according to the present invention is opened .

FIG. 3 is a side view showing a connected state of a connecting gear in the present invention.

FIG. 4 is a side view showing a state before the connection gear of FIG. 3 is connected.

5 is a front view showing a connected state of the connecting gear of FIG. 3. FIG.

[Explanation of symbols]

7 image forming apparatus 7a upper frame 7c lower frame 41, 42 gear regulating member 44 swing plate 38, 47 connecting gear 48 cam member 49 protrusion 52 positioning hole

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoshi Kawamoto 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Atsushi Ogane 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company ( 56) References JP-A-4-291361 (JP, A) JP-A-59-9673 (JP, A) Actually open 60-177134 (JP, U) Actually open 3-117240 (JP, U) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) G03G 21/16 G03G 21/18

Claims (2)

(57) [Claims] And 1. A closable upper frame body, and a lower frame body is configured to be divided, the the upper frame and the lower frame body
Each has a connecting gear and at least one front
The connecting gear swings on the upper frame or the lower frame.
The rocking plate is pivotally supported by the rocking plate held at
The connecting gears are urged in a direction in which they mesh with each other,
Close the subframe and engage each of the connecting gears with each other.
Gear regulation that regulates meshing of the connected gears
A member to the connecting gear of the upper frame and the lower frame
In the image forming apparatus provided in the vicinity, the other frame facing the one frame supporting the swing plate
The gear control member provided on the frame is provided with the connecting teeth that are close to each other.
The rocking plate is formed so as to be located on the outer periphery of the tooth tip of the car.
By contacting the cam member provided on the
When the frame part was opened and closed, it was attached to the rocking plate.
An image forming apparatus configured to displace the position of the one coupling gear . 2. The image forming apparatus according to claim 1, wherein the upper frame is configured to be divided and opened from the front of the main body of the image forming apparatus.