JPH082676Y2 - Cover open / close detection mechanism for electrophotographic printer - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a cover open / close detection mechanism that detects an open / closed state of a cover of an electrophotographic printer.

[Prior art]

2. Description of the Related Art Conventionally, office equipment and the like are generally provided with covers that can be opened and closed at several locations because of the need for maintenance. For example, in an electrophotographic printer device, since maintenance of a developing unit, a cleaning unit, a fixing unit, etc. is performed,
A cover that can be opened and closed is provided for each part. Then, when the cover is opened, it is necessary to stop the high-voltage system inside the apparatus, for example, operations such as charging, transfer, development and fixing, for safety. Conventionally, a detector is provided on the apparatus main body side corresponding to each cover, and when one of the covers is opened, the detector outputs a stop condition signal to stop the printer.

[Problems to be solved by the device]

However, in the above-mentioned conventional configuration, since the detector is provided on the apparatus main body side corresponding to each cover, the manufacturing cost is high and the space for mounting the detector must be secured. However, there was a problem that design restrictions were imposed. The present invention has been made to solve the above problems, and an object of the present invention is to provide a cover open / close detection mechanism for an electrophotographic printer that detects the open / closed state of the cover with a simple structure. To do.

[Means for Solving the Problems]

A cover open / close detection mechanism for an electrophotographic printer according to the present invention is an electrophotographic printer having a fixing unit cover that can be opened and closed, a developing unit cover, and a cleaning cover provided on the developing unit cover. (A) One detector having an actuator with a return spring is provided in the main body of the apparatus, and (b) an L-shaped lever is pivotally supported at the bent portion in the fixing portion cover, and the fixing portion cover is also provided. In the closed state, one end of the lever faces the actuator of the detector, and (c) an arm is pivotally supported at one end in the developing unit cover and the other end is The developing unit cover is provided so as to face the other end of the lever of the fixing unit cover in the closed state, and (d) the closing state of the cover is provided in the cleaning cover. A plate for pressing the other end of the arm toward the other end of the lever in the state, (e) in the closed state of all the covers, the plate presses the arm toward the lever, Is rotated to operate the actuator of the detector.

[Action]

In the above configuration, when all the covers are closed, the plate, the arm, and the lever are engaged, and the lever pushes down the actuator of the detector to operate the detector and maintain the ON state. On the other hand, when the developing unit cover or the cleaning cover is opened, the lever provided in the fixing unit cover is released and the pressing of the actuator is released, so the detector is turned off and the stop condition signal is output. Further, even when the fixing unit cover is opened, the detector and the lever are separated, so that the detector is turned off.

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external view of an electrophotographic printer to which a cover opening / closing detection mechanism according to the present invention is applied, showing a state in which all covers are closed. 2 is a side view with the fixing unit cover open, FIG. 3 is a side view with the developing unit cover open, and FIG. 4 is a side view with the cleaning cover open. Reference numeral 1 denotes a main body of the apparatus, which has covers 3 and 8 for covering the developing portion and the fixing portion on the upper portion thereof. Reference numeral 3 denotes a developing unit cover including a developing unit and a cleaning unit, which is rotatably mounted with a shaft 3'as a fulcrum. A cleaning cover 6 is provided on the developing unit cover 3, and is attached so as to be slidable in the horizontal direction. 8
Is a fixing unit cover provided with a fixing unit, and is attached so as to be rotatable around a shaft 8'as a fulcrum. Next, the configuration of the cover open / close detection mechanism will be described. The device body 1 has a detector 2 for detecting the opening and closing of the cover. The developing unit cover 3 has an arm 5 rotatable about a shaft 5 ′ as a fulcrum, and a spring member 4 for positioning a plate 7 provided on the cleaning cover 6. An L-shaped lever 9 rotatable about a shaft 9'is provided inside the fixing unit cover 8, and one end of the lever is provided with a return spring for the detector 2 with the fixing unit cover closed. Mounted so as to face the actuator 2'of
The other end has a roller 10 facing the arm 5. In FIG. 2, when the developing unit cover 3 is opened as shown by the arrow A, the arm 5 interlocks to release the engagement of the lever 9 with the roller 10, so that the lever 9 causes the spring force of the actuator 2'of the detector 2 to be released. Thus, the detector 2 is turned in the turning direction of the timepiece to turn off the detector 2, so that the detector detects that the developing unit cover 3 is open and outputs a stop condition signal. Upon receipt of this stop condition signal, a control circuit (not shown) stops operations such as charging, transfer, development and fixing inside the apparatus. In FIG. 3, when the fixing unit cover 8 is opened as shown by the arrow B, the lever 9 releases the engagement with the actuator 2'of the detector 2, so that the detector 2 is turned off and the second
As in the case of the figure, the stop condition signal is output. In FIG. 4, when the cleaning cover 6 provided on the developing cover 3 is slid as shown by an arrow C, the cutout portion 7 ′ of the plate 7 provided on the cleaning cover 6 and the spring member 4 are separated from each other. The engagement is released, and the urging force in the direction in which the arm 5 and the lever 9 turn on the detector 2 is removed by the retraction of the plate 7, so that the detector 2 is turned off and the stop condition signal is output. To do.

[Effect of device]

As described above, the cover open / close detection mechanism according to the present invention is
Each cover is equipped with an arm, plate and lever, and when all covers are closed,
The plate and the lever are in contact with each other to operate the actuator, and the opening of any one of the covers releases the operation to the actuator due to the mutual contact of the arm, the plate and the lever. It becomes possible to share the container, the cost is reduced, and the restriction on the installation space in the printer is reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a cover open / close detection mechanism of an electrophotographic printer to which the present invention is applied, showing a state in which all the covers are closed. 2 is a similar side view showing a state in which the developing unit cover is opened, FIG. 3 is a partial side view showing a state in which the fixing unit cover is opened, and FIG. 4 is a developing unit cover and fixing unit. It is a side view which shows the state which closed the part cover and opened the cleaning cover. DESCRIPTION OF SYMBOLS 1 ... Device main body, 2 ... Detector, 3 ... Development part cover, 4 ... Spring material, 5 ... Arm, 6 ... Cleaning cover, 7 ... Plate, 8 ... Fixing part cover, 9 ... Lever.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-125856 (JP, A) JP-A-52-143026 (JP, A) Actually open 1-166351 (JP, U) Actually open 62- 201098 (JP, U) Actual opening Sho 59-147148 (JP, U) Actual opening Sho 59-55759 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A main body of the apparatus, which is openable and closable, a cleaning cover slidably provided on the developing section cover, a fixing section cover, and stop when any one of the covers is opened. In an electrophotographic printer having a detector that outputs a condition signal, (a) one detector having an actuator with a return spring is provided in the apparatus main body, and (b) an L-shape is provided in the fixing unit cover. The lever is pivotally supported at its bent portion, and one end of the lever is provided so as to face the actuator of the detector when the fixing unit cover is closed. (C) An arm is provided in the developing unit cover. The one end is pivotally supported, and the other end is provided so as to face the other end of the lever of the fixing unit cover in the closed state of the developing unit cover, (d) A plate is provided inside the cleaning cover for pressing the other end of the arm toward the other end of the lever when the cover is in the closed state. (E) In the closed state of all the covers, the plate is the arm. A cover opening / closing detection mechanism in which the lever is rotated to operate the actuator of the detector by pressing the lever toward the lever.