JPH0299975A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To assemble the title device without deteriorating door switch performance nor requiring skill and accurate adjustment by providing pressed members, which are pressed by press members provided on doors, and a door switch activated by the movement of the pressed member. CONSTITUTION:The doors 2 and 3 of an electrophotographic device are provided with press members 2a and 3a, and the pressed members 7 are provided between the press members 2a and 3a and the door switch 4 so that the door switch 4 is indirectly operated. The door switch 4 is activated at the half stroke of the operation of the press members 2a and 3a so that the pressed member 7 absorbs the excess stroke of the press members 2a and 3a thereafter. A sufficient stroke margin for the operation of the door switch 4 is allowed; the displacement of the doors 2 and 3 and the door switches 4, which results from the accumulated errors in the fabrication of parts, is substantially absorbed, and this ensures the door switch operation. Therefore, assembly can be performed without deteriorating the door switch performance nor requiring skill and accurate adjustment.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to so-called electrophotographic devices such as copying machines and printers, and more particularly relates to a door switch that operates as the door of the electrophotographic device is opened and closed. .

[Conventional technology]

Prior to explaining the present invention, a laser beam printer will be taken as an example of an electrophotographic apparatus to which the present invention is applied, and its overall configuration will be explained based on FIGS. 6 and 7. FIG. 6 shows the laser beam 11 printer. External perspective view. FIG. 7 is an external perspective view of the laser beam printer shown in FIG. 6 when the door is in an open state.

The laser beam printer shown in FIGS. 6 and 7 includes a printer 1, a first door 2 and second doors 1 to 73 that can be opened and closed with respect to the printer body.

Note that the laser beam printer has almost the same mechanism as a copying machine except for the exposure means, and the first door 2 and second door 3 shown in FIGS. 6 and 7 are similar to those of a conventional copying machine. It is used for clearing paper jams and replacing consumables, which are commonly performed in

Inside the laser beam printer, there is a high voltage power supply,
A heater for heat fixing, a power transmission means, a laser exposure device, etc. are installed, and in order to protect the safety of the operator, a door switch is provided for the opening door to cut off the power when the door is opened. As shown in FIGS. 6 and 7, when there are two doors that open and close in different directions, it is common to provide a door switch for each opening and closing section. However, in Japanese Utility Model Publication No. 62-32290 entitled Image Forming Apparatus, there is a provision for shutting off the power when any two doors or three or more doors installed on the main body of the apparatus are opened. A configuration that allows operation with a door switch is described.

By the way, the door switch described above is a very important safety component, and its operation is strictly required to be reliable. Usually, a microswitch is used as a door switch, but the relative positional relationship between the door and the microswitch cannot be constant due to cumulative manufacturing errors of the parts, and in general, correction of the positional deviation is difficult for the product. It depends on adjustment work during assembly.

[Problem to be solved by the invention]

However, adjusting the door switch during product assembly as described above requires skill, which is one of the causes of high product costs.

An object of the present invention is to enable the door switch to be assembled without impairing its performance, without requiring any skill, and without precise adjustment when manufacturing an electrophotographic device, thereby increasing the efficiency of this type of work. The object of the present invention is to provide an electrophotographic apparatus that can reduce product costs.

[Means to solve the problem]

The purpose is to provide an electrophotographic apparatus having an opening/closing door.
A pressing member provided on the door, a pressed member movably provided on the device body and pressed by the pressing member when the door is closed, and actuated by movement of the pressed member when the door is closed. and a door switch, wherein the pressed member is supported with one end in contact with a fixed member centering on the contact point with the pressing member, and the other end is biased by an elastic body in a direction opposite to the pressing direction of the pressing member. and is rotatably supported within a certain range regulated by the guide member, and the pressed member has a dimension that allows it to rotate even if it is further pressed by the pressing member after the door switch is closed. This is achieved by maintaining a sense of latitude.

[Effect]

According to the present invention having the above configuration, a pressing member is provided on the door of the electrophotographic apparatus, and a pressed member is provided between the pressing member and the door switch, so that the door switch is operated indirectly. , the door switch is operated in the middle of the operating stroke of the pressing member, and the pressed member absorbs the subsequent extra stroke of the pressing member,
As a result, a sufficient stroke margin is provided for the operation of the door switch, and positional deviation between the door and the door switch due to accumulated manufacturing errors of parts is substantially absorbed, thereby ensuring reliable operation of the door switch. Can be done.

〔Example〕

Hereinafter, the present invention will be explained based on one embodiment of FIGS. 1 to 5, with reference to FIGS. 6 and 7, taking as an example the case where the present invention is applied to a laser beam printer. FIG. 7 is a plan view showing how a door switch for an electrophotographic apparatus, which is a main part of the present invention, is installed, and the door switch 4 is provided at the position shown by the dotted line in FIG. 6. FIG.

In FIG. 1, reference numeral 5 denotes a door switch base, which is fixed to the main body frame of the apparatus (not shown). The two microswitches 6 are fixed to the door switch base 5. The first door 2 has a first pressing member 2a,
Further, each of the second doors 3 is provided with a second pressing member 3a. A pressed member 7 is provided between one microswitch 6 and the first pressing member 2a, and between another microswitch 6 and the second pressing member 3a.
is rotatably attached to the door switch base 5 via a pin 8 fixedly attached thereto. Each pressed member 7 is urged by a pressing spring 9 in a direction opposite to the operating direction of the pressing member 2a (and 3a).

Further, a stopper 10 is integrally formed on the hair switch base 5 to restrict the movement of one end of the pressed member 7. Furthermore, an oblong hole 11 is provided at the other end of the pressed member 7.
is formed, and this portion engages with the pin 8 to rotatably guide the pressed member 7.

The operation of the 1A switch having the above configuration will be explained below.

Although FIG. 2 is a partially enlarged view of FIG. 1 and is intended to explain the opening and closing of the second door 3, the following explanation also applies to the opening and closing of the first door 2. This applies to

In FIG. 2, the second door 3 is in the open state and the second
The pressing member 7 and the pressed member 7 are separated from each other. At this time,
The pressed member 7 is urged by a push spring 9 and is stopped in contact with the lower wall surface of the door switch base 5. Therefore, the microswitch 6 is in an open state, turning off the power of the laser beam printer.

In FIG. 3, the second door 3 is almost closing, and at this time the pressing member 3a pushes the pressed member 7 upward, and its left end finally hits the end surface of the stopper IQ. In addition, the pressing force of the pressing spring 9 is the same as that of the micro switch 6.
The operating force of the pressed member 7 is always set larger than the operating force of the pressed member 7.
rotates around the right end in the figure as a fulcrum. Further, the relative position of the stopper 10 and the microswitch 6 is such that when the left end of the pressed member 7 is in contact with the stopper 10, the microswitch 6 is closed.
In the state shown in FIG. 3, the door switch is closed and the laser beam printer is turned on. Therefore, the relative positional accuracy between the door switch base 10 and the microswitch 6 is determined by the dimensional accuracy of the door switch base 5 alone, and is not affected by the cumulative errors of other parts. , it works reliably in this state.

In FIG. 4, the second door 3 is completely closed. At this time, the pressed member 7 is further pushed up in three directions from the state shown in FIG. 3, and as a result, the oblong hole 11 and the pin 8 In the above configuration, the actuator 6a of the microswitch 6 is
It is located near the stopper 10, and even if the pressed member 7 rotates, there is almost no change in its position. That is, once the microswitch 6 enters the operating state, the operating state of the microswitch 6 is maintained stably even if the pressed member 7 moves considerably thereafter.

FIG. 5 shows a case where, for example, the pressing member 3a is longer than a predetermined dimension due to a manufacturing error. In this case, the pressed member 7 is pushed further upwards than in FIG. 4, and the oblong hole 11 and pin 8 finally come into contact with each other. However, even in such a worst condition, no change occurs in the microswitch 6 for the reasons mentioned above.
Note that this also applies when the pressing member 3a is shorter than a predetermined dimension.

In summary, according to the present invention, a pressing member is provided on the door of an electrophotographic apparatus, and a pressed member is provided between the pressing member and the door switch, so that the door switch is operated indirectly, and the pressing member The door switch is operated in the middle of the operating stroke, and the pressed member absorbs the extra stroke of the pressing member after that, thereby providing a sufficient stroke margin for the door switch operation and reducing manufacturing errors in parts. Positional deviations between the door and the door switch due to accumulation can be substantially absorbed, and the operation of the door switch can be ensured.

In the illustrated embodiment, the present invention is applied to a laser beam printer, but there is no problem in applying the present invention to electrophotographic apparatuses other than laser beam printers. Furthermore, in the illustrated embodiment, a door switch is attached to each of two doors provided in the main body of a laser beam printer. It can also be applied when attaching a door switch to this. Further, in the present invention, when the number of doors provided in the main body of the electrophotographic apparatus is three or more, and a door switch is individually attached to each door,
Furthermore, the present invention can be applied to a case where a plurality of doors are provided in the main body of an electrophotographic apparatus and the opening/closing operation of each door is detected by one door switch.

〔Effect of the invention〕

The present invention is as described above, and as is clear from the description of the illustrated embodiments, according to the present invention, when manufacturing an electrophotographic device, the performance of the door switch is not impaired, and the assembly requires skill. It can be assembled without any precise adjustment, which improves the efficiency of this type of work and ultimately reduces product costs.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, FIG. 1 is a plan view showing the installed state of a door switch for an electrophotographic device, which is the main part of the present invention, and FIGS. 2 to 5 are 1 is a partially enlarged view for explaining the operation of a door switch for an electrophotographic device, FIG. 6 is an external perspective view of a laser beam printer suitable for applying the present invention, and FIG. 7 is a view of the laser beam shown in FIG. 6. FIG. 2 is a perspective view of the exterior of the printer when the door is in an open state.

Claims (1)

[Scope of Claims] 1. In an electrophotographic apparatus having an opening/closing door, a pressing member provided on the door; and a pressing member movably provided on the main body of the apparatus and pressed by the pressing member when the door is closed. It has a pressed member and a door switch that is activated by the movement of the pressed member when the door is closed, and the pressed member has one end in contact with a fixed member around a contact point with the pressing member. the other end is urged by an elastic body in the opposite direction to the pressing direction of the pressing member, and is supported rotatably within a certain range regulated by the guide member; An electrophotographic device characterized in that the member has a dimensional margin that allows it to rotate even if it is further pressed by a pressing member after the door switch is closed.