JPH0446280Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention includes a width adjusting mechanism for positioning paper in the width direction within the main body of the apparatus, a charging charger around the photosensitive drum, an exposure section, a developing device, and a transfer charger. The present invention relates to an electrophotographic apparatus in which a fixing section and a fixing section are sequentially arranged along a paper transport direction of a paper transport path.

[Problems that conventional technology and ideas try to solve]

In conventional electrophotographic devices of this type, the paper conveyance path is partially divided and there are many parts, and when each part within the main body of the device is grounded, each part must be grounded individually. As a result, there was a problem that the configuration became complicated.

The present invention has been made to solve these problems, and its purpose is to provide an electrophotographic apparatus in which each part within the apparatus body can be grounded with a simple structure.

[Means for solving problems]

The present invention includes a paper feeding unit that feeds paper into the apparatus body, an electronic transfer unit including a charging charger, an exposure unit, a developing device, and a transfer charger arranged around a photosensitive drum, and a fixing unit that In an electrophotographic apparatus arranged sequentially along the paper transport direction of a transport path, a lower guide of the paper transport path between at least the width adjusting part and the fixing part is composed of one conductive plate, and the conductive plate A recess for accommodating the transfer charger is formed in a part of the transfer charger.

[Effect]

Each part within the main body of the device can be grounded to the conductive plate, which is the lower guide.

[Example of idea]

FIG. 1 shows the internal structure of an electrophotographic apparatus, and numeral 1 in the figure is the main body of the apparatus.

An electronic transfer section 2 is provided inside the main body 1 of the apparatus.

The electronic transfer section 2 has a structure in which a charging charger 4, a developing device 5, and a transfer charger 6 are arranged around a rotating photosensitive drum 3.
The exposed surface of the photosensitive drum 3 charged in the above is exposed by being irradiated with an exposure beam in the exposure section 7, developed by the developing device 5, and then transferred onto the paper 8 by the transfer charger 6. In addition, the electronic transfer section 2,
A fixing section 9 is provided at the front in the paper conveyance direction. The fixing unit 9 is composed of a pair of fixing rollers 10 and 11 that are provided so as to be in pressure contact with each other from above and below with the paper conveyance path in between.

The apparatus main body 1 is composed of an upper case 12 and a lower case 13 made of synthetic resin, and the electronic transfer section 2 and the fixing section 9 are attached to the upper case 12.

In the figure, reference numeral 14 denotes a conductive plate constituting a lower guide of the paper conveyance path, and a recess 15 for accommodating the transfer charger 6 is provided in the conductive plate 14 at a position directly below the heat-sensitive drum 3. As shown in FIG. 1, this conductive plate 14 has front and rear ends 14a, 14
b is the engaging portion 13a, 1 provided on the lower case 13.
3b, and is thereby attached to the lower case 13.

A recess 16 is provided at the bottom of the lower case 13,
A drawer-type cassette case 17 serving as a paper holder for holding papers 8 in a stack is housed in this recess 16 . The front end of this cassette case 17 is
It extends upward so as to overlap the lower front end of the apparatus main body 1, and a manual paper insertion guide 19 is formed at the upper end of the extension part 18. In addition, two or more sheets of paper 8 are placed at the front end of the cassette case 17.
A paper peeling member 20 is provided to prevent the paper from being ejected.

Two support shafts 21 are provided on the inner surface of the recess 16.
a and 21b are provided parallel to each other. One of the support shafts 21a is spanned between both inner surfaces of the recess 16, one end of the push-up member 22 is fixed to the central part of the support shaft 21a, and one end of the crank member 23 is fixed to the end of the support shaft 21a. It is fixed. A paper mounting plate 24 is rotatably attached to the bottom of the cassette case 17, and when the push-up member 22 rotates together with the support shaft 21a, the paper mounting plate 24 is mounted at the rotating end of the push-up member 22. 24 is pushed up. A presser member 25 is rotatably supported on the other support shaft 21b, and a portion of the presser member 25 and the rotating end of the crank member 23 are connected by a connecting member 26, and a push-up member Rotating operation of 22 and presser member 2
The rotating motion of No. 5 is linked. Further, a case holding protrusion 2 is provided at the other end of the holding member 25.
7 is provided so that when the rotating end of the push-up member 22 is raised, the holding projection 27 of the holding member 25 presses the front surface of the cassette case 17 to hold the case 17 in the storage position. . A tension spring 28 is suspended between the crank member 23 and the presser member 25, and the tension of this spring 28 raises the pivoting end of the push-up member 22, and also causes the presser protrusion 27 to be pushed into the cassette. It is pressed against the front of the case 17.

The inner surface of the extension part 18 of the cassette case 17 is
It has a concave curved surface 29. On the other hand, a convex curved surface 30 is formed at the lower front of the main body 1 of the apparatus, and is opposed to the concave curved surface 29 with a gap for paper insertion therebetween. There is. Further, the extension portion 18 continuous to the concave curved surface 29
The upper end is a manual paper guide surface 32 that is continuous with the paper insertion guide 19, and this guide surface 32 is formed at the end of the curved paper guide section 31.
The subsequent paper path, i.e. the conductive plate 14
They meet at the top.

A feed roller 33 is provided in the apparatus main body 1 so as to face the paper loading plate 24 from above. In addition, guide rollers 34 and 35 are provided in the middle of the curved paper guide portion 31 on the concave curved surface 29 side and the convex curved surface 30 side, respectively, so as to be in contact with each other. Furthermore, the curved paper guide section 3
1 and the manual paper guide surface 32, there is a pair of width adjusting rollers 36 as a paper feeding section.
A width adjusting portion consisting of 37 is provided. Both rollers 36 and 37 are in contact with each other from above and below, and
The rotating shaft is arranged with a slight inclination to the traveling direction of the paper 8, and the paper 8 is sent forward while being gathered in the width direction, and the paper 8 is pressed against one side of the path to prevent skewing. act. Then, the feed roller 33 and the lower width adjusting roller 3
An intermediate roller 38 that interlocks both the rollers 33 and 37 is arranged between the rollers 33 and 37.
are designed to rotate in conjunction with each other in the same direction.

A paper discharge port 39 is provided at the rear of the upper case 12 to guide the paper 8 that has passed through the electronic transfer section 2 and the fixing section 9 to the outside. Note that from the end of the curved paper guide section 31 to just before the fixing section 9, the paper 8 is guided along the conductive plate 14, and from the end of the conductive plate 14 to the paper discharge port 39, the paper 8 is guided separately. is guided by paper guides 40 and 41. Then, the paper 8 on the conductive plate 14 is held between guide rollers 42 and 43, each pair of which is arranged at a plurality of locations along the conductive plate 14, and is sent to the fixing section 9.
The paper is sandwiched between guide rollers 44 and 45, which are arranged in pairs at a plurality of locations along lines 0 and 41, and sent to the discharge port 39.

An upper paper guide plate 47 provided on the cassette case 17 side and an upper paper guide plate provided on the upper case 12 side are provided between the upper side of the manual paper guide surface 32 and the vicinity of the electronic transfer section 2. 48 are arranged to face the manual paper guide surface 32 and the conductive plate 14, respectively.

In the above configuration, the case holding protrusion 27 is pulled toward you against the tension spring 28, and the holding member 2
When 5 is rotated downward, the tension spring 28 gradually extends. After the spring 28 reaches its maximum length as shown in FIG. 2, the elastic force of the spring 28 rotates the presser member 25 downward, and
2 begins to act in the direction of lowering it. As a result, the cassette case 17 is disengaged from the holding member 25, and the paper loading plate 24 is released from the support of the push-up member 22 and descends, so that the cassette case 17 can be pulled out as shown in FIG. can.

When the paper 8 is put into the cassette case 17 that has been pulled out in this manner, and the case 17 is again stored at the bottom of the apparatus main body 1 and the presser member 25 is rotated upward, the tension spring 28 is gradually expanded. go. After the spring 28 reaches its maximum length as shown in FIG. 2, the elastic force of the spring 28 acts in a direction that rotates the presser member 25 upward and raises the push-up member 22. . This results in
The cassette case 17 is held in the storage position by the presser member 25, and the paper loading plate 24 is pushed up by the push-up member 22 and rises, pushing up the paper 8 from below and pressing the uppermost paper against the delivery roller 33. and enters the set state.

Next, when the feed roller 33 is rotated, the uppermost sheet 8 slides forward due to the frictional resistance of contact with the roller 33, and the guide roller 34,
35, and after changing its direction backward at the curved paper guide section 31, it is inserted between the width adjustment rollers 36 and 37. Here, since the width adjustment rollers 36 and 37 are rotating in conjunction with the delivery roller 33,
The paper 8 is conveyed forward while being gathered in the width direction by these rollers 36 and 37. Therefore,
The paper 8 is pressed against one side of the path and advances while being prevented from being skewed. Then, predetermined printing is performed on the paper 8 in the electronic transfer section 2, and the paper is discharged from the paper discharge port 39 while being guided by paper guides 40 and 41.

Further, when the paper 8 taken out from the cassette case 17 changes its direction in the curved paper guide section 31, paper jams tend to occur in this guide section 31. In that case, the cassette case 17 is The concave curved surface 2 constituting the guide portion 31
9 and the convex curved surface 30, the jammed paper can be easily taken out.

Further, in the above configuration, the lower guide between the width adjustment rollers 36 and 37 that constitute the width adjustment part and the fixing part 9 is constructed of one conductive plate 14, and a part of the conductive plate 14 is provided with electronic information. Since the recess 15 is formed to accommodate the transfer charger 6 of the transfer unit 2, the grounding of each part in the device main body 1 can be connected to the conductive plate 14, which is the lower guide, and the number of parts is small. Moreover, each part within the apparatus body can be grounded with a simple configuration.

Note that the present invention is not limited to the above embodiments. For example, as shown in FIG.
4c may be fitted from above using the spring properties of the lower case 13.

[Effect of idea]

As described in detail above, the present invention is an electronic type in which a width adjusting section for positioning paper in the width direction, a charging charger, an exposure section, a developing device, and a transfer charger are arranged around the photosensitive drum in the main body of the apparatus. In an electrophotographic apparatus in which a transfer section and a fixing section are sequentially arranged along the paper conveyance direction of a paper conveyance path, a lower guide of the paper conveyance path from at least the width adjusting section to the fixing section is provided with one sheet. It is characterized in that it is constructed of a conductive plate, and a recessed portion for accommodating the transfer charger is formed in a part of the conductive plate, and each part in the main body of the apparatus is grounded to the conductive plate,
With a small number of parts and a simple configuration, each part within the device main body can be grounded.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a side sectional view showing the internal structure of the printing device, and Figure 2 is a partial sectional view showing the state of insertion and removal of the cassette case. 3 is a partial sectional view showing a state in which the cassette case is pulled out, and FIG. 4 is a perspective view showing a structure for attaching a conductive plate in another embodiment of the present invention. 1... Apparatus main body, 2... Electronic transfer section, 3...
Thermal drum, 4...Charging charger, 5...Developing device, 6...Transfer charger, 7...Exposure section, 8...
... Paper, 9 ... Fixing section, 10, 11 ... Fixing roller, 14 ... Conductive plate, 15 ... Transfer charger accommodation recess, 36, 37 ... Width adjustment roller.

Claims (1)

[Scope of utility model registration request] Inside the main body of the apparatus, a paper feeding section that feeds paper into the interior, an electronic transfer section consisting of a charging charger, an exposure section, a developing device, and a transfer charger arranged around a photosensitive drum, and a fixing section are arranged in the paper transport path. In an electrophotographic apparatus arranged sequentially along the paper conveyance direction, the lower guide of the paper conveyance path from at least the paper feed section to the fixing section is composed of a single conductive plate, and a part of the conductive plate includes a conductive plate. An electrophotographic apparatus characterized in that a recess is formed to accommodate the transfer charger.