JPH064350Y2 - Electrophotographic device - Google Patents

Description

The present invention relates to an electrophotographic apparatus that develops an electrostatic latent image formed on the outer periphery of a photoconductor and transfers the developed image to a medium such as paper.

2. Description of the Related Art Conventionally, a lower frame and an upper frame are vertically rotatably connected to each other, a transfer charger and a fixing unit are provided on the lower frame, and a support body holding at least a photoconductor and a hook provided on the support body are provided. A developing unit composed of a developing unit that is detachably supported from below is provided in the section, a holding unit that detachably holds the developing unit is provided in the lower frame, and an electrostatic latent image is formed on the outer periphery of the photoconductor. With a developing device,
There is one in which a developed toner image is transferred onto a sheet by a transfer charger and the image transferred onto the sheet is fixed by a fixing unit.

The problem to be solved by the invention is that the upper frame is rotated to rotate the lower frame when a jam occurs between the photoconductor and the transfer charger, or when toner is replenished or the photoconductor is replaced. The developing unit can be attached and detached by opening the upper space of the developing unit, but the developing unit is held by the hook so that it can be attached to the support with one touch. There is a problem of falling.

Means for Solving the Problems A lower frame and an upper frame are vertically rotatably connected to each other, and are detachably supported from below by a support body holding at least a photoconductor and a hook portion provided on the support body. A developing unit composed of a developing device, and a holding portion for detachably holding the developing unit on the lower frame,
A handle is provided on the support body, the handle being located directly above the center of gravity of the developing unit.

Therefore, the developing unit is maintained in the horizontal state when the handle is gripped, and the developing unit is prevented from dropping from the support.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Reference numeral 1 is a housing. This housing 1 is a lower frame 2
And an upper frame 3, and the rear portions of the lower frame 2 and the upper frame 3 are rotatably connected with a support shaft 4 as a fulcrum. Further, a clamp (not shown) is attached to the front portions of the lower frame 2 and the upper frame 3 so as to engage with each other in a detachable manner. A cassette case 6 for accommodating a large number of sheets 5 in a stacked state is detachably attached to the bottom of the lower frame 2 from the front side. The cassette case 6 has a guide plate 7 for changing the direction of the sheets 5 into a U shape and a manual tray. 8 and. A guide plate 9 that faces the guide plate 7 and guides the sheet 5 is held by the lower frame 2 and
A guide plate 10 that faces the rear portion and guides the sheet 5 is held by the upper frame 3. Further, the lower frame 2 has a paper feed roller 1 for drawing out the paper 5 in the cassette case 6.
1, a feed roller 12 or 13 for feeding the sheet 5 to a photosensitive drum, which will be described later, a transfer charger 14, and a feed roller 16 for guiding the sheet 5 that has passed through the transfer charger 14 to a fixing device 15. The fixing device 15 includes a pressure roller 17 detachably held by the lower frame 2 and a heating drive roller 18 held by the upper frame 3. Further, on the upper frame 3, a guide plate 19 that guides the sheet 5 that has passed through the fixing device 15, feed rollers 21 and 22 that sends the sheet 5 to the sheet receiver 20, a light source unit 23, a charging charger 24, and a charge eliminating charger 25. And a motor 26 are provided.

Next, a developing unit 27 is provided. In the developing unit 27, a developing device 30 is detachably attached to a support 28 that holds a cleaning mechanism (not shown) and a photoconductor 29. The developing device 30 includes a toner box 31 that stores toner and a magnet roller 32. Pins 33 are provided upright on both sides of the toner box 31. A U-shaped notch 34 is formed on both sides of the support 28 so as to detachably support the pin 33 from below, and both ends of the shaft 35 of the photoconductor 29 and the pin 36 are formed.
And are projected. Further, gap rollers 37 having a diameter slightly larger than the outer diameter of the magnet roller 32 are arranged at both ends of the magnet roller 32. Therefore, the developing device 30 is assembled to the support member 28 by fitting the pin 33 into the notch 34 and bringing the gap roller 37 into contact with the outer peripheral surface of the photosensitive member 29. In this state, the photoconductor 29
The gap between the magnet roller 32 and the magnet roller 32 is fixed by a gap roller 37. Then, the developing unit 27
A handle 38 located right above the center of gravity of is fixedly attached to the support 28. Further, the lever 4 is urged in the clockwise direction by the spring 39, the return position is determined by the stopper 40, and the upper frame 3 is rotated about the shaft 41 as a fulcrum.
Two are provided. Further, U-shaped notches 43, 44 and 45 are formed as holding portions on both sides of the lower frame 2. The pin 33 of the developing device 27 is supported by the notch 43, the shaft portion 35 of the photoconductor 29 is pressed downward by the lever 42 and supported by the notch 44, and the pin 36 is supported by the notch 4.
Supported by 5. Further, a hook 46 that engages with the handle 38 is urged counterclockwise in the upper frame 3 and is rotatably held.
An operating rod 48 for pressing is provided slidably.

In such a configuration, in the process of rotating the photoconductor 29 once, a charging layer is formed on the outer periphery of the photoconductor 29 by the charging charger 24, and the electrostatic latent image is formed by scanning the charging layer with a laser beam from the light source unit 23. Is formed, the electrostatic latent image is developed by the developing device 30, and the developed image is transferred to the transfer charger 1.
The residual toner adhered to the outer circumference of the photoconductor 29 is removed by the transfer mechanism 4 onto the paper 5, and the electrostatic latent image on the outer circumference of the photoconductor 29 is removed by the charge removal charger 25. The transferred sheet 5 is sent backward by the feed roller 16, fixed by the fixing device 15 and discharged to the sheet receiver 20.

When a jam occurs between the photoconductor 29 and the transfer charger 14, or when the toner is supplied to the toner box 31 or the photoconductor 29 is replaced, first, the operating rod 48 is pressed from the front and the hook 46 is pulled. It is rotated in the clockwise direction and retracted from the handle 38. In this state, the upper frame 3 is opened upward as shown in FIG. In this state, the lever 42 is also displaced upward, and the developing unit 2
7 remains supported by the notches 43, 44, and 45. Therefore, the developing unit 27 can be removed from the lower frame 2 by lifting the grip 38. At this time, since the handle 38 is located right above the center of gravity of the developing unit 27, the developing unit 27 is maintained in the horizontal state,
Therefore, the developing device 30 does not fall out of balance and fall from the support body 28 even though it is held in the hooked state by the notch 34.

As shown in FIG. 5, both sides of the support 28 and the handle 3 are
8, pins 49 are erected on one surface opposite to the surface 8 and elongated holes 50 are formed on the other surface so as to engage with these pins 49, and the handle 38 is positioned downward when the upper frame 3 is not opened. By doing so, the space between the lower frame 2 and the upper frame 3 can be reduced. In order to achieve the same purpose, as shown in FIG. 6, the handle 38 is rotatably attached to the support 28 by the shaft 51, and the upper frame 3
The handle 38 may be kept in the laid state when the is not opened. Further, as shown in FIG.
By forming the grip portion 52 that is easy to hold in the central portion of 8, the front-rear and left-right balance of the developing unit 27 can be maintained.

Effect of the Invention Since the present invention is configured as described above, when the developing unit is removed from the lower frame, the developing unit can be maintained in a horizontal state, so that the developing device is held by the support member in a hooked state. Even when the developing device is attached, it is possible to prevent the developing device from falling off from the support when the developing device is attached and detached.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a vertical sectional side view showing a state in which the upper frame is opened upward, and FIG. 2 is a state in which the upper frame is closed downward. FIG. 3 is a vertical sectional side view, FIG. 3 is a side view showing a supporting structure of the developing unit in an enlarged manner, FIG. 4 is an exploded perspective view showing the developing unit in an enlarged manner, and FIGS. FIG. 7 is a perspective view showing a modification of the handle in an enlarged manner. 2 ... Lower frame, 3 ... Upper frame, 27 ... Developing unit, 28 ... Support, 29 ... Photoconductor, 30 ... Developing device, 3
4 ... Notches (hooking parts), 38 ... Handles, 43 to 45 ... Notches (holding parts)

Claims (4)

[Scope of utility model registration request] 1. A developing device in which a lower frame and an upper frame are vertically rotatably connected to each other, and which is detachably supported from below by a support member holding at least a photosensitive member and a hook portion provided on the support member. And a holding portion that detachably holds the developing unit above the lower frame, and a handle located substantially directly above the center of gravity of the developing unit in the horizontal state is provided on the support body. An electrophotographic device characterized in that 2. An electrophotographic apparatus according to claim 1, wherein a handle is attached to the support so as to be slidable in the vertical direction. 3. An electrophotographic apparatus according to claim 1, wherein a handle is rotatably attached to a support body. 4. An electrophotographic apparatus according to claim 1, wherein a grip portion is formed at the center of the handle.