JPH0125952Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a mechanism for pulling out and stopping a developing device and a recording body unit in a recording apparatus.

As a conventional device of this kind, for example, the one shown in FIG. 1 is known, and in the figure, 1 is a recording unit, 2 is an electrostatic charger, 3 is an exposure device, and 4 supports the recording unit 1. An integrated developing device unit, 5 is a feed roller, 6 is a registration roller, 7 is a transfer charger,
8 is a fixing device, 9 is a static elimination charger, 10 is a cleaning device, 11 is a recording paper, and 12 is a main body frame.

In the apparatus, the developing unit 4 is pulled out from the main body frame 12, and maintenance work such as replenishing the developer tank and replacing the endless belt-like recording medium is performed periodically. However, the minimum amount that the developer unit must be pulled out manually by the operator during this maintenance work is
When replenishing the developer, draw out the amount La that allows the lid of the developer tank to be opened, and when replace the recording medium, draw out the amount Lb that allows the recording unit to be completely exposed outside the main body frame together with the developer unit.
In addition, when replenishing developer, the amount of removal is smaller and more frequently than when replacing the recording medium. Therefore, when replenishing developer, it is unnecessary to remove the recording medium from the There have been various drawbacks such as the deterioration of the performance of the recording medium or the adhesion of scratches and dust, and the deterioration of the reliability of the apparatus due to erroneous operation.

This invention eliminates the drawbacks of the conventional methods described above, and allows the operator to easily select and operate the different draw-out amounts of the developer and recording unit as described above, thereby protecting the quality of the recording medium and preventing erroneous operations. It is an object of the present invention to provide a mechanism for stopping the pulling out of a developing device and a recording body unit, which has excellent operability without the need for a developing device and a recording body unit.

This invention will be explained with reference to the embodiments shown in FIGS. 2-4.

In this embodiment, the same parts as those of the conventional one are given the same reference numerals to simplify the explanation, and mainly new parts will be explained.

In FIG. 2, reference numeral 21 denotes a receiving member provided on one side edge of the developing unit 4. The lower surface of this receiving member 21 is flush with the bottom plate 22 of the developing unit 4, and the guide plate 22 of the main body frame 12 is connected to the receiving member 21. It slides on the top, and has a long hole 24 bored in the middle of its length. Reference numeral 25 denotes a stop member pivotably supported by a fixing pin 26 provided on the main body frame 12, and this stop member 25 has a rising portion 27a and a tapered portion 27b at one end as shown in FIG. A hook-shaped engaging portion 27 is formed, and this engaging portion 27 is inserted from below into an elongated hole 28 bored in the guide plate 23 on the same line as the elongated hole 24 in the drawing direction, and is positioned at the other end. A tension spring 29 is attached to the engaging portion 27 to constantly apply an upward biasing force. Reference numeral 30 denotes an operating lever fixed to the fixing pin 26, and an operating knob 31 provided at the tip thereof projects outward from a window hole 32 of the main body frame 12.

The elongated hole 28 is located at a position where the developer unit 4 is pulled out by an amount La where the lid can be opened.
It is positioned to match the elongated hole 24 of the developing unit 4. In Fig. 2, 33 is the recording unit 1.
It is a record of.

In the above configuration, when the developing unit 4 is pulled out by an amount La sufficient for replenishing the developer from the normal use condition shown in FIG. At this position, the engaging portion 27 of the stop member 25 engages with the elongated hole 24 of the receiving member 21.
The rising portion 27a of the engaging portion 27 enters the elongated hole 2.
Further withdrawal is prevented by contacting the side edge of 4 (FIG. 4). If it is necessary to pull out the developer unit 4 further from this state to replace the recording medium 33, etc., the operation lever 30, which has swung upward together with the stop member 25 due to the above operation, is swung downward by the operation knob 31. stop member 25
Remove the engaging portion 27 from the elongated hole 24. Then, the stoppage of the developing unit 4 is released, and it becomes possible to draw out the developing unit 4 beyond the drawing amount Lb. Next, when inserting the developing device unit 4 into the guide plate 23 of the main body frame 12 in order to return to the normal use state, the stop member is placed at a position where the elongated hole 24 of the receiving member 21 matches the elongated hole 28 of the guide plate 23. The engaging portion 27 of 25 enters this elongated hole 24, but at this time, the tapered portion 27b of the engaging portion 27 is pushed by the side edge of the elongated hole 28 of the developing unit 4, and this pressing stops it. Since the engaging portion 27 of the member 25 naturally swings downward, the insertion continues without being hindered from sliding.

FIG. 5 shows another embodiment of this invention, in which a stop member 37 which also serves as an operating lever and which has an engaging portion 36 on its lower edge is swung by a fixing pin 38 to the main body frame 12 above the receiving member 21. The operating knob 39 provided at the tip of the stop member 37 is configured to protrude outside the main body frame 12, and when the developer unit 4 is pulled out from the main body frame 12 by an amount La, the stop member 37 is movable. The engaging portion 36 is different from the previous embodiment in that the engaging portion 36 falls into the elongated hole 24 of the receiving member 21 due to its own weight using the fixing pin 38 as a fulcrum and stops further pulling out of the developing unit 4. is the same as in the previous embodiment.

FIG. 6 shows yet another embodiment of this invention,
An L-shaped stop member 41 having an engaging portion 40 on the lower edge is swingably provided on the main body frame 12 above the receiving member 21 by means of a fixing pin 42, and the upper piece 41a of the stop member 41 is A compression spring 43 is attached to one side to constantly bias the engaging part 40 downward, and the other side is pressed by the upward piece 41a.
A slider 46 is slidably disposed through an elongated hole 45 that engages with a pin 44 fixed to the main body frame 12, and an operation knob 47 provided at one end of the slider 46 is connected to the main body frame 12. When the developer unit 4 is pulled out from the main body frame 12 by an amount La, the engaging portion 40 of the stop member 41 enters the elongated hole 24 of the receiving member 21 under the pressure of the spring 43, thereby stopping the development. unit 4
The other parts are the same as those of the previous embodiments.

Since this device is constructed as described above, the operator can easily select and adjust the amount of pullout of the different developing units and recording unit when replenishing the developer and when replacing the recording medium. Therefore, the quality of the recording medium can be well protected without the recording medium being unnecessarily exposed to the outside from the main body frame as in the conventional case. Moreover, it has remarkable effects such as being able to reliably prevent erroneous operations and providing excellent operability.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing an embodiment of this invention;
The figure is an enlarged perspective view of the main part showing the inserted state of the developer unit, and Figure 3 is a front view showing the end of the operating lever.
FIG. 4 is an explanatory diagram of the operation, and FIGS. 5 and 6 are drawings showing different embodiments of this invention. 4... Developer unit, 12... Body frame, 21... Receiving member, 23... Guide plate, 24, 2
8... Long hole, 25, 37, 41... Stopping member, 2
6, 38, 42...Fixing pin, 27, 36, 40
...Engaging portion, 29...Tension spring, 30...Operation lever, 31...Operation knob, 32... Window hole.

Claims (1)

[Claims for Utility Model Registration] A developing device and a recording body unit are integrally formed into a unit and are guided and supported in a manner that they can be put in and taken out from a main body frame, and the developing device and recording body unit are combined with a developer tank. In a recording device having recording bodies connected in a pull-out direction such that a developer tank is on the pull-out side, a receiving member having an engaged portion is provided on one side edge of the developer and recording body unit. When the developing device and recording unit are pulled out to a predetermined position where developer can be supplied to the developer tank, the engaging portion engages with the engaging portion of the receiving member, and the developing device and recording unit are A recording device characterized in that a stop member for stopping the body unit is swingably provided on the body frame, and a member for releasing the stop of the stop member is provided such that an operating section projects outside from the body frame. A mechanism for stopping the developer and recording unit from being pulled out in the apparatus.