JP2009199009A - Power shut-off mechanism and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power shut-off mechanism that smoothly operates a power supply switch by a simple configuration. <P>SOLUTION: The interlock switch mechanism (4) includes: a first door power transmission means that is actuated by being pressed by a first door when it is closed; a second door power transmission means that is actuated by being pressed by a second door when it is closed; and a power supply switch (7) wherein when the first or second door is opened, the first or second door power transmission means is actuated to stop supply of power, wherein the first door power transmission means includes a first door lever (8), a sub-lever (11) and a main lever (10), and the second door transmission means includes a second door lever (9) and a main lever (10), and the door levers (8, 9) are provided with cams (8a, 9a) that press the main lever (10) and/or sub-lever (11). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power cut-off mechanism in an apparatus including a plurality of doors that can be opened and closed in different directions, and an image forming apparatus including the same.

Conventionally, as a power cutoff function used in an image forming apparatus or the like, that is, as a so-called interlock switch mechanism, the open / close state of a front door for accessing an image forming unit and a side door for paper jam processing is changed to one. Interlock switch mechanisms that detect power supply switches are widely used (see, for example, Patent Document 1 and Patent Document 2).
The power supply switch has a function of stopping supply of power to the fixing unit when the door is opened and stopping supply of power to the laser diode of the writing unit. Therefore, the power supply switch plays a role of ensuring the safety of the operator.
However, in the conventional interlock switch mechanism, since the user manually operates the front door and the side door, the switching operation of the power supply switch may not be performed smoothly. More specifically, the interlock switch mechanism becomes a complicated mechanism, and a dimensional error accumulates due to an increase in the number of parts, which may cause a problem that a large force is required for the switching operation of the power supply switch.

JP-A-2005-67067 JP-A-11-305512

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a power cut-off mechanism capable of smoothly switching the power supply switch with a simple configuration and an image forming apparatus including the same. The purpose is to do.

The features of the present invention, which is a means for solving the above problems, are listed below.
The power shut-off mechanism according to the present invention includes a first door that can be opened and closed, a second door that can be opened and closed in a direction different from the opening and closing direction of the first door, and the first door that is pressed when the first door is closed. The first door power transmission means that operates, the second door power transmission means that operates when pressed by the second door when the second door is closed, and the first door or the second door is opened A power cut-off mechanism comprising: a power supply switch that stops power supply when the first door power transmission means or the second door power transmission means is activated, wherein the first door power transmission means is the first door The second door power transmission means includes a second door lever and a power supply switch pressing member, and the first door lever and the second door lever are provided. Press the power supply switch pressing member. Wherein the cam is provided.

In the power shut-off mechanism of the present invention, the power supply switch pressing member of the first door power transmission means and the second door power transmission means are provided separately, and the power supply switch of the first door power transmission means is provided. The main lever is used as the pressing member, the sub lever is used as the power supply switch pressing member of the power transmission means for the second door, the power supply switch is pressed when the main lever rotates, and the sub lever is rotated. The power supply switch is configured to be pressed.
The power shut-off mechanism of the present invention further includes the power supply switch, an open door detection switch that is pressed and switched when the first door power transmission means or the second door power transmission means is operated, The first door lever, the second door lever, and the main lever and sub-lever are unitized.
The power shut-off mechanism of the present invention further includes a first door rib and a second door rib formed on the first door and the second door, respectively, for pressing the first door lever and the second door lever. The lever rotation shafts of the 1-door lever and the second door lever are arranged along the direction perpendicular to the insertion direction of the first door rib and the second door rib, respectively.

Further, in the power cut-off mechanism of the present invention, in the cross section along the opening and closing direction of the second door, the center of the portion where the second door rib presses the second door lever is point A, and the second door lever is the main. When the center of the portion that presses the lever is point B and the center of rotation of the second door lever is point C, the line segment AC is longer than the line segment BC.
Further, the power cut-off mechanism of the present invention further includes a point D at the center of the portion where the sub lever presses the power supply switch, a point E at the center of the portion where the second door lever presses the sub lever, When the moving center is a point F, the line segment DF is shorter than the line segment EF.

The power shut-off mechanism of the present invention is further provided with an open door detection switch that is pressed and switched when the second door power transmission means is actuated, and when the second door lever is pushed in a certain distance by the second door rib, When the second door rib is pushed in, the second door rib presses the open door detection switch, and the second door rib presses the open door detection switch. In the state, the second door lever is configured such that the movement to return to the original position is restricted by the second door rib.
The power shut-off mechanism of the present invention is further characterized in that an open door detection switch that is pressed and switched when the first door power transmission means or the second door power transmission means operates is provided.

In addition, the power shut-off mechanism of the present invention is further characterized in that a rotation stop for restraining the rotation of the first door lever or the second door lever is provided.
The power shut-off mechanism of the present invention is further characterized in that one of the first door and the second door is a door for accessing the image forming unit, and the other is a door for paper jam handling. .
An image forming apparatus according to the present invention includes any one of the power interrupting mechanisms described above.

  In the power cut-off mechanism as the means to solve the above and the image forming apparatus including the same, the power supply switch can be switched smoothly with a simple configuration.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Note that it is easy for a person skilled in the art to make other embodiments by changing or correcting the present invention within the scope of the claims, and these changes and modifications are included in the scope of the claims. The following description is an example of the best mode of the present invention, and does not limit the scope of the claims.

FIG. 1 shows an image forming apparatus including an embodiment of a power cut-off mechanism of the present invention. The image forming apparatus includes a first door (1) that can be opened and closed provided on the front side of the apparatus, and a second door (2) that can be opened and closed in a direction different from the opening and closing direction of the first door (1). ing. The first door (1) is pivotable so as to fall to the near side when viewed from the front of the apparatus. A paper feed stocker (3) for stocking paper is provided below the first door (1). The second door (2) is rotatable so as to fall to the right side when viewed from the front of the apparatus.
In this embodiment, as a power interruption mechanism used in the image forming apparatus, that is, a so-called interlock switch mechanism, a first door (1) for accessing the image forming unit and a second door (for paper jam handling) ( An interlock switch mechanism that detects the two doors 2) with one power supply switch is employed.

  FIG. 2 shows the appearance of the main body structure (5) provided with the interlock switch mechanism (4). The interlock switch mechanism (4) includes a first door rib provided on the first door when the first door is closed, and a second door rib provided on the second door when the second door is closed. It is inserted into the switch mechanism (4). When the first door or the second door is opened and the insertion of the first door rib or the second door rib into the interlock switch mechanism (4) is released, the power supply to the various devices in the image forming apparatus is stopped. The

  FIG. 3 shows the interlock switch mechanism (4) in an enlarged manner. A sheet metal plate (6) is provided on the front side of the interlock switch mechanism (4), and the plate (6) is removed as shown in FIG. As shown in FIG. 4, the interlock switch mechanism (4) includes a power supply switch (7), a first door lever (8), a second door lever (9), a main lever (10), a sub lever ( 11) An open door detection switch (12) is provided. The rotation shafts of the first door lever (8), the second door lever (9) and the main lever (10) are fixed to the plate (6), and the rotation shaft of the sub lever (11) is the main lever (10). ).

And by such an internal mechanism, when the 1st door (1) is closed, the power transmission means for 1st doors which is pressed and act | operated by the 1st door (1) is comprised. More specifically, the first door power transmission means includes a rotatable first door lever (8), a sub-lever (11) that can contact the first door lever (8), and a sub-lever ( 11) A main lever (10) for rotatably supporting 11) is provided. Here, the main lever (10) is used as a power supply switch pressing member. The auxiliary lever (11) is also used as a power supply switch pressing member.
In addition to the first door power transmission means, second door power transmission means is configured to be operated by being pressed by the second door (2) when the second door (2) is closed. The second door power transmission means includes a second door lever (9) and a main lever (10). The first door power transmission means and the second door power transmission means have the main lever (10) as a common component. And when this 1st door (1) or 2nd door (2) opens this interlock switch mechanism (4), the power transmission means for 1st doors or the power transmission means for 2nd doors act | operates, The power supply switch (7) is released and the power supply is stopped.

The first door lever (8) is provided with a cam (8a) for pressing the sub lever (11). The second door lever (9) is provided with a cam (9a) for pressing the main lever (10). That is, the cam (8a) of the first door power transmission means and the cam (9a) of the second door power transmission means are provided separately. The cams (8a, 9a) are integrally formed with the door levers (8, 9), but may be attached separately.
As described above, in the interlock switch mechanism (4) of the present embodiment, the power supply switch (7) is pressed when the main lever (10) rotates, and the power is supplied even when the sub lever (11) rotates. The switch (7) is configured to be pressed. Moreover, the interlock switch mechanism (4) of this embodiment is provided with the open door detection switch (12) above the main lever (10). When the second door power transmission means is activated, the open door detection switch (12) is pressed, and the switch is switched on / off.
In this interlock switch mechanism (4), the power supply switch (7), the open door detection switch (12), the first door lever (8), the second door lever (9), the main lever (10) and the sub-switch The lever (11) is unitized. For this reason, the assembling work to the image forming apparatus can be easily performed.

The rotation shaft portion (8b) of the first door lever (8) is arranged perpendicular to the insertion direction of the first door rib, and the second door lever (9) with respect to the insertion direction of the second door rib. The rotation shaft portion (9b) is arranged vertically. Therefore, since the direction in which each door rib presses each door lever (8, 9) matches the insertion direction of each door rib, the force applied to each door rib can be suppressed. In addition, the first door and the second door can be opened and closed smoothly. Furthermore, it is not necessary to match the axial direction of the rotation shaft portion (8b) of the first door lever (8) with the axial direction of the rotation shaft portion (9b) of the second door lever (9). The degree of freedom in layout increases, and the interlock switch mechanism (4) can be made compact.
Further, all the movable parts of the interlock switch mechanism (4), that is, the first door lever (8), the second door lever (9), the main lever (10), and the sub lever (11) are pivoted. Since it rotates about the center, the frictional resistance due to the sliding of the movable parts is reduced as compared with the mechanism having a linear motion, and the failure occurrence rate of the interlock switch mechanism (4) can be reduced.

  FIG. 5 shows a state of the interlock switch mechanism (4) when both the first door (1) and the second door (2) shown in FIG. 1 are opened. The first door rib of the first door (1) and the second door rib of the second door (2) are not pressing the first door power transmission means and the second door power transmission means, respectively. That is, the first door lever (8) and the second door lever (9) are not pressed by the first door rib of the first door (1) and the second door rib of the second door (2), respectively. is there. In this state, the power supply switch (7) is in an off state, that is, in a state where power is not supplied to the image forming unit of the image forming apparatus.

  FIG. 6 shows the state of the interlock switch mechanism (4) when the first door (1) shown in FIG. 1 is opened and the second door (2) is closed. When the second door is closed, the second door lever (9) rotates counterclockwise in the drawing. Then, the cam (9a) of the second door lever (9) presses the main lever (10) to rotate the main lever (10). At the same time, the slope on the upper end side of the second door lever (9) presses the push button (12a) of the open door detection switch (12). The first door is in an open state, and the first door lever (8) is not in contact with the sub lever (11) or does not fully push in the sub lever (11). 7) is an off state, that is, a state where power is not supplied to the image forming unit of the image forming apparatus.

  Here, the reason why the open door detection switch (12) is provided only for the second door side will be described. The interlock switch mechanism (4) of the present embodiment is configured to detect the first door and the second door that open and close in the vertical direction with one power supply switch (7), and more specifically, at least When one door is opened, the power supply to various devices such as an image forming unit is stopped. Therefore, in the interlock switch mechanism (4) of this embodiment, even if the power supply switch (7) is turned off, the power supply switch (7) cannot determine which door is open. Therefore, the interlock switch mechanism (4) of the present embodiment opens when the second door is opened and the second door lever (9) is rotated so as to return to the position of the two-dot chain line in FIG. The push button (12a) of the door detection switch (12) is released so that it can be determined that the second door has been opened. If the power supply switch (7) is turned off and the open door detection switch (12) is pressed (on state), it is determined that the first door has been opened. This determination is made by an electronic circuit having a CPU in the image forming apparatus. Of course, the electronic circuit includes a power supply switch (7) and an open door detection switch (12). The opening of the first door or the second door is displayed on the device operation panel of the image forming apparatus.

Since the open door detection switch (12) is directly pressed by the slope on the upper end side of the second door lever (9), a rib for pressing the push button (12a) against the second door lever (9). Etc. are not formed.
In FIG. 6, if the second door lever (9) pushes the open door detection switch (12) with a cam instead of a slope, the size of the second door side varies and the user opens and closes the second door. Variations in the amount of insertion of the second door rib due to the amount of force applied are absorbed.

  FIG. 7 shows a state of the interlock switch mechanism (4) when the first door (1) shown in FIG. 1 is closed and the second door (2) is opened. When the first door is closed, the first door lever (8) rotates. The cam (8a) of the first door lever (8) presses the sub lever (11), and the pressed sub lever (11) rotates about the rotation shaft (10a). However, since the second door lever (9) does not rotate, the sub lever (11) does not contact the push button (12a) of the open door detection switch (12), and the push button (12a) is not pressed. At this time, the interlock switch mechanism (4) is in a state where the power supply switch (7) is in an off state, that is, a state where no power is supplied to the image forming unit of the image forming apparatus.

FIG. 8 shows a state of the interlock switch mechanism (4) when both the first door (1) and the second door (2) shown in FIG. 1 are closed. When the first door is closed, the first door lever (8) rotates. Then, the cam (8a) of the first door lever (8) presses the sub lever (11). Further, when the second door is closed, the second door lever (9) rotates counterclockwise in the drawing to rotate the main lever (10). Therefore, the sub lever (11) moves to the power supply switch (7) side with the movement of the rotation shaft (10a) of the main lever (10) and is pressed by the first door lever (8). It rotates around the rotation shaft (10a) and presses the push portion (7a) of the power supply switch (7).
At this time, in the interlock switch mechanism (4), the power supply switch (7) is in an on state, that is, in a state where power is supplied to the image forming unit of the image forming apparatus.

  When the first door and the second door are opened from the state of FIG. 7, the push portion (7 a) has a leaf spring shape, so that the auxiliary lever (11) is pushed back by the restoring force of the spring. Then, the first door lever (8), the main lever (10), and the second door lever (9) rotate in a direction to return to their original positions. The second door lever (9) returns to its original position due to its own weight, but the first door lever (8) does not return to its original position as it is because the pivot axis is in the vertical direction. Therefore, it is good to provide the rotation stop which restrains rotation of the lever (8) for 1st doors. Then, when the flat plate portion (8c) is parallel to the front surface of the image forming apparatus, the rotation may be restricted. Moreover, it is good to hold | maintain a flat plate part (8c) with small force so that a flat plate part (8c) may collide with a rotation stop, and may not rotate in the opposite direction again. For example, a protrusion that can be disengaged with a slight force may be engaged with the flat plate portion (8c). Such a rotation stop and projection for restricting the movement of the first door lever (8) can be formed on the plate (6) shown in FIG. 3, for example.

  FIG. 9 shows details of the first door lever (8). The first door lever (8) includes a cam (8a), a rotation shaft portion (8b), and a flat plate portion (8c) with which the first door rib abuts. Simply put, it is a cam having a circular structure centered on the rotating shaft. When the cam (8a) is formed, it is possible to absorb variations in the dimensions of the first door, variations in the amount of insertion of the first door rib due to the force applied by the user when the first door is opened and closed, and the like.

The first door rib (1a) presses the flat plate portion (8c) of the first door lever (8), but the first door rib (1a) collides perpendicularly with the flat plate portion (8c) at the start of pressing, Since the flat plate portion (8c) is rotated around the rotation shaft portion (8b), no extra force is applied when the first door is closed, and the first door can be closed smoothly.
Further, the second door rib (2a) shown in FIG. 8 presses the plane of the second door lever (9), but since the plane is along the vertical direction at the start of pressing, the second door rib (2a) ) Collides perpendicularly to the plane. And since the 2nd door lever (9) is rotated centering on the rotating shaft part (9b), when closing a 2nd door, an extra force does not enter and it can close a 2nd door smoothly. .

  In the interlock switch mechanism (4) described above, on / off control of the power supply switch (7) as shown in FIG. 10 can be performed according to the open / closed state of the first door and the second door. More specifically, the power supply switch (7) is turned on when the first door and the second door are closed. In this power supply switch (7), a predetermined on / off determination is made regardless of the opening / closing order of the first door and the second door.

Next, design dimensions of the interlock switch mechanism (4) will be described with reference to FIGS. FIG. 11 schematically shows a cross section along the opening and closing direction of the second door. The center of the portion where the second door rib presses the second door lever (9) is point A, the center of the portion where the second door lever (9) presses the main lever (10) is point B, the second door When the rotation center of the lever (9) is point C, the line segment AC is longer than the line segment BC. Thus, the interlock switch mechanism (4) utilizes the lever principle, can turn on the power supply switch (7) with a small operating force, and is excellent in operability. The center of the pressed portion is the center of gravity in the case of surface contact, the center of the line segment in the case of line contact, and the point in the case of point contact.
Further, as shown in FIG. 12, in the interlock switch mechanism (4) of the present embodiment, the center of the portion where the sub lever (11) presses the push portion (7a) of the power supply switch (7) is point D, When the center of the portion where the second door lever (9) presses the sub-lever (11) is point E and the center of rotation of the sub-lever (11) is point F, the line segment DF is made shorter than the line segment EF. ing. Thus, the interlock switch mechanism (4) utilizes the lever principle, can turn on the power supply switch (7) with a small operating force, and is excellent in operability. Moreover, the interlock switch mechanism (4) of this embodiment can absorb the play of the dimension by the accumulation of the tolerance by the assembly | attachment operation | work of an interlock switch mechanism (4) in the part of a sublever (11).

  In the interlock switch mechanism (4) of the above-described embodiment, the first door lever (8) has the cam (8a) that presses the sub lever (11), and the second door lever (9) is the main lever. Since the cam (9a) that presses (10) is provided, the door levers (8, 9) smoothly rotate on the curved surface of the cam, and the power supply switch (7) smoothly with a simple configuration. Can be switched.

The form which improved the interlock switch mechanism (4) of embodiment mentioned above is shown in FIG. In the interlock switch mechanism (4) shown in FIG. 13, when the second door rib (2a) presses the second door lever (9) to rotate the second door lever (9) to some extent, The upper end of the door lever (9) is in contact with the lower surface of the second door rib (2a). When the second door rib (2a) is pushed in to some extent, the tip of the second door rib (2a) comes into non-contact with the second door lever (9) and presses the push button (12a) of the open door detection switch (12). . The second door rib (2a) may be cylindrical or prismatic.
In other words, when the second door lever (9) is pushed a certain distance with the second door rib (2a), the tip of the second door rib (2a) and the second door lever (9) are brought into non-contact, When the second door rib (2a) is pushed in, the second door rib (2a) presses the open door detection switch (12), and the second door rib (2a) presses the open door detection switch (12). The door lever (9) is configured such that the movement to return to the original position is restrained by the second door rib (2a).

  With such a configuration, the second door rib (2a) formed on the second door (2) directly presses the open door detection switch (12), so that the number of parts can be reduced. As a result, the play due to the dimensional tolerance of parts can be suppressed. Further, since the second door lever (9) comes into contact with the peripheral surface of the second door rib (2a) and the movement of the second door lever (9) to return to the original position is restricted, the second door Only the force perpendicular to the insertion direction of the second door rib (2a) is applied from the lever (9). Accordingly, the reaction force when the second door rib (2a) is inserted is small.

  Finally, FIG. 14 shows another embodiment in which the interlock switch mechanism (4) of the above-described embodiment is improved. In FIG. 14, the rotation stop (6a) which restrains rotation of the 2nd door lever (9) is formed in the plate (6). When the rotation stop (6a) is formed in this way, it is possible to prevent the interlock switch mechanism (4) from being damaged due to excessive pressing of the second door rib. In addition, you may attach a rotation stop (6a) as another component. For example, the rotation stop can be formed by screwing a bolt into the plate (6).

FIG. 1 is an explanatory view showing an image forming apparatus provided with an embodiment of an interlock switch mechanism of the present invention. FIG. 2 is an explanatory view showing an appearance of a main body structure provided with an interlock switch mechanism. FIG. 3 is an explanatory view showing the interlock switch mechanism in an enlarged manner. FIG. 4 is an explanatory view showing a form in which the plate (6) of FIG. 3 is removed. FIG. 5 is an explanatory diagram showing a state when both the first door and the second door are opened. FIG. 5A is a front view of the interlock switch mechanism, and FIG. 5B is a perspective view of the interlock switch mechanism. FIG. 6 is an explanatory view showing a state when the first door is opened and the second door is closed. 6A is a front view of the interlock switch mechanism, and FIG. 6B is a perspective view of the interlock switch mechanism. FIG. 7 is an explanatory diagram showing a state when the first door is closed and the second door is opened. FIG. 7A is a front view of the interlock switch mechanism, and FIG. 7B is a perspective view of the interlock switch mechanism. FIG. 8 is an explanatory diagram showing a state when both the first door and the second door are closed. FIG. 8A is a front view of the interlock switch mechanism, and FIG. 8B is a perspective view of the interlock switch mechanism. FIG. 9 is an explanatory diagram showing details of the first door lever. FIG. 9A is a front view of the first door lever, and FIG. 9B is a front view of the first door lever. FIG. 10 is an explanatory diagram showing a relationship between opening / closing of the first door and the second door and ON / OFF of the power supply switch. FIG. 11 is an explanatory view schematically showing a cross section along the opening and closing direction of the second door. FIG. 12 is an explanatory view showing a form in which the first door lever and the second door lever of FIG. 11 are rotated. FIG. 13 is an explanatory view showing a modification of the interlock switch mechanism. FIG. 14 is an explanatory view showing a second modification of the interlock switch mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st door 1a 1st door rib 2 2nd door 2a 2nd door rib 3 Feed stocker 4 Interlock switch mechanism 5 Main body structure 6 Plate 6a Rotation 7 Power supply switch 7a Push part 8 1st door lever 8a Cam 8b Rotating shaft 8c Flat plate 9 Second door lever 9a Cam 9b Rotating shaft 10 Main lever 10a Rotating shaft 11 Sub lever 12 Open door detection switch 12a Push button

Claims (11)

A first door that can be opened and closed;
A second door that can be opened and closed in a direction different from the opening and closing direction of the first door;
Power transmission means for the first door that is operated by being pressed by the first door when the first door is closed;
Power transmission means for second door which is operated by being pressed by the second door when the second door is closed;
A power supply switch that stops power supply when the first door power transmission means or the second door power transmission means is activated when the first door or the second door is opened;
In a power cut-off mechanism comprising:
The first door power transmission means includes a first door lever and a power supply switch pressing member,
The second door power transmission means includes a second door lever and a power supply switch pressing member,
The first door lever and the second door lever are provided with cams for pressing the power supply switch pressing member. The power cut-off mechanism according to claim 1,
The power supply switch pressing members of the first door power transmission means and the second door power transmission means are provided separately,
The main lever is used as the power supply switch pressing member of the first door power transmission means,
A secondary lever is used as the power supply switch pressing member of the second door power transmission means,
A power cut-off mechanism, wherein the power supply switch is pressed when the main lever rotates, and the power supply switch is pressed even when the sub lever rotates. The power cut-off mechanism according to claim 2,
The power supply switch, the open door detection switch that is pressed when the first door power transmission means or the second door power transmission means is operated, the first door lever, and the second door A power cut-off mechanism, wherein the lever and the main lever and the sub-lever are unitized. The power cut-off mechanism according to claim 1,
A first door rib and a second door rib are formed on the first door and the second door, respectively, in order to press the first door lever and the second door lever.
The power cut-off mechanism, wherein the lever rotation shafts of the first door lever and the second door lever are arranged along a direction perpendicular to the insertion direction of the first door rib and the second door rib, respectively. The power cut-off mechanism according to claim 4,
In the cross section along the opening and closing direction of the second door,
The center of the portion where the second door rib presses the second door lever is point A, the center of the portion where the second door lever presses the main lever is point B, and the rotation center of the second door lever is point C. In this case, the power cut-off mechanism is characterized in that the line segment AC is longer than the line segment BC. The power cut-off mechanism according to claim 2,
When the center of the portion where the sub lever presses the power supply switch is point D, the center of the portion where the second door lever presses the sub lever is point E, and the center of rotation of the sub lever is point F, the line segment DF Is shorter than the line segment EF. The power cut-off mechanism according to claim 4,
An open door detection switch that is pressed and switched when the second door power transmission means is actuated;
When the second door lever is pushed a certain distance with the second door rib, the tip of the second door rib and the second door lever become non-contact,
Furthermore, when the second door rib is pushed in, the second door rib presses the open door detection switch,
In the state where the second door rib presses the open door detection switch, the second door lever is configured to be restrained by the second door rib to return to the original position. The power cut-off mechanism according to claim 1,
An electric power cut-off mechanism, characterized in that an open door detection switch that is pressed and switched when the first door power transmission means or the second door power transmission means operates is provided. The power cut-off mechanism according to claim 1,
The electric power interruption mechanism characterized by the fact that the rotation stop which restrains rotation of the lever for 1st doors or the lever for 2nd doors is provided. The power cut-off mechanism according to claim 1,
One of the first door and the second door is a door for accessing the image forming unit, and the other is a door for paper jam handling. An image forming apparatus comprising the power cut-off mechanism according to any one of claims 1 to 10.

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