JP2006164918A - Switch unit and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door switch unit and an image forming device capable of switching a switch even if a thrusting stroke of a pushing means fluctuates due to a dimensional error of the pushing means or ab assembling error of a door, and capable of restraining breakage of the switch. <P>SOLUTION: As the switch is enabled to move at least in pressing direction of the pressing means, the switch moves in pressing direction to the extent of the increase of a pressing force even if the thrusting stroke of a pushing means becomes larger than a standard thrusting stroke caused by dimensional error of the pushing means or assembling error of a door. By the above, pressing force of the pressing means applied to the switch can be reduced, and the breakage of the switch can be restrained. Further, as the switch is energized in a direction opposed to the pressing direction of the pressing means by an elastic member, the switch touches the pressing member elastically, and the switch is imparted with a pressing force in a level of switching the turn-on/turn-off of the switch. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a door switch unit in which a switch is switched ON / OFF by an opening / closing operation of a door that opens / closes a housing of an image forming apparatus or the like, and an image forming apparatus including the door switch unit.

  Conventionally, in this type of image forming apparatus, a door for performing jam processing or the like is provided. As an example of the switch unit provided in this type of image forming apparatus, for safety, the image forming apparatus is interlocked with the opening operation of the door so that the operation of the image forming apparatus is not performed when the door is open. There is known an interlock switch that shuts off the power source (Patent Document 1).

FIG. 13 is a diagram illustrating an example of a conventional interlock switch 1100. As shown in FIG. 13, the conventional interlock switch 1100 is fixed to the side wall 720 of the apparatus main body by two screws 1420 and 1410. The door side surface 1110 a of the interlock switch 1100 includes a button 1110 urged toward the door and a lever 1120 that comes into contact with the button 1110. By pushing the lever 1120, the button 1110 moves into the switch and the switch is turned on. The door switch 1100 is provided with a terminal 1130 and is connected to a power supply circuit of the apparatus. The door (not shown) has a pressing rod 500 as a pressing means.
When the door is closed, the pressing rod 500 moves in the direction a in the figure and comes into contact with the lever 1120. When the door is further closed, the pressing rod 500 pushes the lever 1120 toward the apparatus main body. When the lever 1120 is pushed into the apparatus main body, the button 1110 is pushed into the switch by the lever 1120, and the interlock switch 1100 is switched from the OFF state to the ON state. In this manner, the button 1110 is pushed into the switch by the lever 1120, and the door is closed when the interlock switch 1100 is ON.

JP 2002-116668 A

However, in the conventional interlock switch 1100, when the amount of pushing the lever 1120 of the pushing rod 500 is smaller than the standard pushing amount due to a dimensional error of the pushing rod 500, an assembly error of the door, or the like, the lever is pushed. Accordingly, there is a problem that the door is closed while the interlock switch 1100 remains in the OFF state.
Therefore, it is conceivable to arrange the switch so that the switch 1100 is pressed by the pressing rod 500 even when the pressing amount is reduced from the reference pressing amount due to an assembly error of the door. However, the conventional interlock switch 1100 is fixed to the side wall 720 of the apparatus main body by two screws 1420 and 1410 as shown in FIG. For this reason, if the amount of pushing the lever 1120 of the pressing rod 500 is larger than the reference pushing amount, there is a problem that the lever 1120 is pushed and deformed more than necessary, or the interlock switch 1100 is damaged.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a switch even when the pressing amount of the pressing means varies due to a dimensional error of the pressing means, an assembly error of the door, or the like. It is an object of the present invention to provide a door switch unit and an image forming apparatus that can be switched and can suppress breakage of a switch.

In order to achieve the above object, the invention of claim 1 is provided with a switch in one of the casing and the door that opens and closes the casing, and a pressing means that presses the switch on the other, and the door opening and closing operation. In the door switch unit in which the switch is switched ON / OFF by the pressing means pressing the switch, the switch is configured to be movable at least in the pressing direction of the pressing means. An elastic member that biases the switch in a direction opposite to the pressing direction is provided.
According to a second aspect of the present invention, in the switch unit of the first aspect, the elastic member is made of an insulator.
According to a fourth aspect of the present invention, there is provided the switch unit according to any one of the first to third aspects, further comprising a bracket that is attached to either the casing or the door and supports the switch, and the bracket includes the pressing means. A back portion facing the surface opposite to the surface of the switch facing the switch, and the elastic member is provided between the back surface portion and the surface opposite to the surface of the switch facing the pressing means. It is characterized by that.
According to a fifth aspect of the present invention, in the switch unit according to any one of the first to fourth aspects, a shaft hole or a shaft for mounting the switch is provided on a side of the casing or door to which the switch is mounted. The switch is attached to the shaft hole or the shaft so as to be rotatable with respect to the pressing direction.
According to a sixth aspect of the present invention, there is provided an image forming apparatus including a switch unit that turns on / off a predetermined power source in the apparatus by opening / closing a door that opens / closes the casing. The switch unit is used.

According to the first to sixth aspects of the present invention, the switch is configured to be movable at least with respect to the pressing direction of the pressing means. For this reason, even if the pressing amount of the pressing means increases more than the reference pressing amount due to a dimensional error of the pressing means, a door assembly error, or the like, the switch can move in the pressing direction by the increase amount. For this reason, the pressing force to the switch of a press means can be reduced, and damage to a switch can be suppressed. Further, since the switch is urged by the elastic member in the direction opposite to the pressing direction of the pressing means, the pressing force is such that the switch elastically contacts the pressing means and the switch is switched ON / OFF from the pressing means. Is attached to the switch. Thereby, ON / OFF of a switch can be favorably switched by the opening / closing operation | movement of a door.
In addition, even if the pressing amount of the pressing means is smaller than the reference pressing amount due to a dimensional error of the pressing means or a door assembly error, the position where the switch moves in the pressing direction by the pressing means. If a switch is arranged in the case, the following effects can be obtained. That is, even when the pushing amount is reduced from the reference pushing amount due to a door assembly error or the like, the pressing means can surely press the switch. As a result, even when the pushing amount is reduced from the reference pushing amount due to a door assembly error or the like, the ON / OFF of the switch can be reliably switched by the door opening / closing operation.

Hereinafter, an image forming apparatus to which the present invention is applied will be described.
First, the basic configuration of the image forming apparatus will be described. FIG. 1 is a front view showing a schematic configuration of the image forming apparatus according to the present embodiment.

  The image forming apparatus 1 includes an image forming unit 2 for forming an image, a paper feed cassette that can be inserted and removed from the front side (front side in FIG. 1) of the apparatus main body 1 and stacks and stores a large number of sheets P. 41 is provided. Further, an image reading unit 11 for reading a document is disposed above the apparatus main body 1.

  The image forming unit 2 includes a carriage 23 and a carriage guide 21 that guides the carriage 23. Further, the carriage 23 is provided with ejection openings for ejecting ink liquids of Y (yellow), M (magenta), C (cyan), B-1 (black), and B-2 (black) to the paper. A head (not shown) is provided.

The image forming unit 2 includes a conveyance belt 31, and the conveyance belt 31 is stretched around the driving roller 32 and the driven roller 33 with appropriate tension. The drive roller 32 is rotationally driven at a predetermined rotational speed by a drive motor (not shown), and accordingly, the transport belt 31 is also rotated at a predetermined speed. In addition, a charging roller 34 for charging the surface of the conveyance belt 31 is provided, and a voltage is applied to the charging roller 34 from a high voltage power source (not shown). In addition, the image forming unit 2 includes a guide member (platen) 35 that guides the conveyance belt 31 in a region facing the image forming unit 2, and a pressing roller that presses the sheet P against the conveyance belt 31 at a position facing the driving roller 32. 36.
The image forming unit 2 is detachable from the apparatus main body.

  Further, the apparatus main body includes a cartridge loading unit 35 that accommodates ink cartridges 34C, 34B-1, 34B-2, 34M, and 34Y. Each of the ink cartridges 34C, 34B-1, 34B-2, 34M, and 34Y is connected to a supply pump (not shown), and the supply pump is appropriately driven to supply the ink liquid in the ink cartridge 34 to the carriage 23. ing. Each color ink cartridge 34 is detachably attached to the cartridge loading section 35.

  The image reading unit 11 includes a first traveling body 15 including a document illumination light source 13 and a mirror 14 for scanning a document (not shown) placed on the contact glass 12, and two mirrors 16. , 17 are disposed so as to be reciprocally movable. Image information scanned by the reading traveling bodies 15 and 18 is read as an image signal into an image reading element 20 such as a CCD installed behind the lens 19. The read image signal is digitized and subjected to image processing. Based on the image-processed signal, the image forming unit 2 forms an image on the paper P.

  The image forming apparatus can receive image data formed by the image forming unit 2 from an external device via a communication cable or a network, and can process the received image data to form an image. Examples of the external device that inputs image data formed by the image forming unit 2 include an information processing device such as a personal computer, an image reading device such as an image scanner, and an imaging device such as a digital camera.

Next, an image forming operation of the image forming apparatus 1 of the present embodiment will be described.
First, a document is set on the contact glass 12 of the image reading unit 11, and a start switch (not shown) is pressed. Then, the first traveling body 15 and the second traveling body 18 travel, and the first traveling body 15 emits light from the light source 13 and further reflects the reflected light from the document surface toward the second traveling body 18. . Reflected light from the document surface directed to the second traveling body 18 is reflected by the mirror of the second traveling body 18 and is input to the image reading element 20 through the lens 19 to read the document content and generate image data. The Alternatively, image data as image information is sent from an external device such as a personal computer (not shown) via a communication cable or the like.

  Next, the paper P is fed out from the paper feed cassette 41 and separated and conveyed one by one by the separation roller 42 and the friction pad 43. The transported paper is transported to the image forming unit 2 by a pair of paper feed rollers 49. The paper P transported to the image forming unit 2 is pressed against the transport belt 31 by the pressing roller 36. The surface of the conveyance belt 31 is charged by the charging roller 34 and electrostatically attracts the paper P. The electrostatically attracted paper P is transported to a position facing the carriage 23 by the transport belt 31. When the sheet P reaches the position facing the carriage 23, the movement of the conveying belt 31 is stopped, and the carriage 23 reciprocates in the main scanning line direction according to the image data, while a predetermined ink is applied to a predetermined position of the stopped sheet. The liquid is discharged and an image for one line is recorded on the paper P. Here, one line refers to a range in the sub-scanning line direction in which the head (not shown) can record on the paper P with the paper P stopped. When the recording for one line is completed in the main scanning line direction, the conveyance belt 31 is driven for a predetermined time, and the sheet is moved by one line and stopped. As described above, the carriage 23 reciprocates in the main scanning line direction according to the image data, but records an image for one line. Such a process is repeated a predetermined number of times to form a desired image on the paper. The paper P on which a desired image is formed is conveyed to the paper discharge tray 7 by a pair of paper discharge rollers 74, 75, 76, 77 including a paper discharge roller and a spur.

  The image forming apparatus 1 includes a plurality of openable doors. When a paper jam is detected in the paper transport path, the open / close door opens the openable door to remove paper jammed in the paper transport path from the outside. When it is detected that the ink in the ink cartridge 34 has run out, the door can be opened and replaced with a new ink cartridge 34.

2A is a diagram illustrating the position of the opening / closing door of the image forming apparatus, and FIG. 2B is a diagram illustrating a state in which the opening / closing door is opened.
As shown in FIG. 2A, the image forming apparatus includes a first opening / closing door 50 on the right side surface of the image forming apparatus and a second opening / closing door 51 on the left side surface. The paper discharge tray 7 is provided with a third opening / closing door 52 and a fourth opening / closing door 53. A fifth opening / closing door 54 is provided in front of the image forming apparatus. As shown in FIG. 2B, the first and second open / close doors 50 and 51 are opened by rotating downward with respect to the side surface of the image forming apparatus. The third open / close door 52 is opened by rotating upward with respect to the paper discharge tray 7, and the fourth open / close door 53 is on the right side in the figure with respect to the paper discharge tray 7. It can be opened by moving it horizontally. When a paper jam is detected in the paper conveyance path, the first to fourth doors are opened, and the jammed paper is discharged from the image forming apparatus.
The fifth open / close door 54 is opened by rotating to the near side in the figure, and can be replaced with a new ink cartridge 34.

Each of these open / close doors is provided with an interlock switch for turning on / off the power of the image forming apparatus. When the open / close door is opened, the switch is turned off so that the power of the image forming apparatus is turned off. It has become.
Hereinafter, the interlock switch 100 that is turned on / off by opening and closing the first opening / closing door will be described. The interlock switch 100 provided in each opening / closing door includes the interlock switch 100 provided in the first opening / closing door. It has the same configuration.

  FIG. 3 is a perspective view of the first opening / closing door 50, and FIG. 4 is an enlarged view around the hole 60. As shown in FIGS. 3 and 4, a hole 62 and an interlock switch are provided on a surface 62 a to which a holding member 62 that holds the posture of the first opening / closing door 50 is fixed when the first opening / closing door 50 is opened. An attachment portion 61 to which the unit 100 is attached from the inside is provided. As shown in FIG. 3, a detection member 63 that detects opening / closing of the first opening / closing door 50 is attached to the surface 62 a to which the holding member 62 is fixed. The detection member 63 is provided with a button 63a protruding from the surface 62a to which the holding member 62 is fixed. When the first opening / closing door 50 is in a closed state, the button 63a and the first opening / closing door 50 come into contact with each other to push the button 63a into the apparatus. Thereby, the detection member 63 can detect that the first opening / closing door is in a closed state. In the present embodiment, a detection member 63 for detecting opening / closing of the first opening / closing door 50 is attached separately from the interlock switch unit 100, but the function of turning on / off the power by the interlock switch unit 100. And a function of detecting that the first opening / closing door is in a closed state.

FIG. 5 is a perspective view of the interlock switch unit 100. As shown in FIG. 5, in the interlock switch unit 100, an interlock switch 110 and an elastic member 130 are attached to a bracket 120.
The interlock switch 110 has a shaft hole (not shown), and a screw 140 is inserted into the shaft hole so that the interlock switch 110 is rotatably attached to the side plate 121 of the bracket 120. The door side surface 110 a of the interlock switch 110 is provided with a button 111 urged toward the door and a lever 112 that comes into contact with the button 111. When the button 111 is inside the switch, the switch is in an ON state, and when the button 111 is protruding from the switch 110, the switch is in an OFF state. The lever 112 is provided to come into contact with the button 111 to easily move the button 111 into the door switch. By pushing the lever 112, the button 111 moves into the switch and the switch is turned on. A terminal 113 is provided on the device main body side surface 110b of the door switch 110, and is connected to a power supply circuit of the device.

  The elastic member 130 is attached to a back surface portion 122 that extends from the side plate 121 of the bracket 120 and faces the device main body side surface of the door switch 110, and is in contact with the device main body side surface 110 b of the door switch 110. Thereby, even if the wall surface 71 facing the opening / closing door 50 is not formed on the apparatus main body, the interlock switch 110 can be urged toward the pressing rod 50a.

The elastic coefficient of the elastic member 130 is set higher than the elastic coefficient of the button 111, and the elastic member 130 is deformed after the button 111 is moved into the switch by the lever 112.

  6A and 6B are diagrams for explaining the operation of the interlock switch unit 100. FIG. As shown in FIG. 6A, the first opening / closing door 50 has a pressing rod 50a. When the first opening / closing door 50 is moved in the direction of the arrow a shown in FIG. 6A and the first opening / closing door 50 is closed, the pressing rod 50 a passes through the hole 60 and contacts the lever 112. When the first opening / closing door 50 is further moved in the direction of the arrow a and the first opening / closing door 50 is closed, the lever 112 is moved toward the apparatus main body by the pressing rod 50a. When the lever 112 moves to the apparatus main body side, the button 111 moves to the inside of the switch by the lever 112. When the lever 112 pushes the button 111 about halfway into the switch, the interlock switch 110 is switched from the OFF state to the ON state. Further, when the first opening / closing door 50 is closed, as shown in FIG. 6B, the lever 112 comes into contact with the door side surface 110a of the interlock switch 110, and the button 111 is completely buried inside the switch. . When the first opening / closing door 50 is further closed from this state, the interlock switch 110 rotates in the direction b in the figure while deforming the elastic member 130. Then, as shown in FIG. 6B, the first opening / closing door 50 is closed with the elastic member 130 deformed.

  The pushing amount of the interlock switch 110 of the pressing bar 50a varies depending on the dimensional error of the pressing bar 50a, the assembly error of the first opening / closing door 50, and the like. The assembly position of the interlock switch unit 100 is set so that the elastic member is compressed by 1 [mm] or more even when the pushing amount is minimized. As a result, even if there is a dimensional error of the pressing rod or an assembly error of the first opening / closing door, the interlock switch 110 can be reliably switched from the OFF state to the ON state when the first opening / closing door is closed. it can. Further, the thickness of the elastic member 130 is set to a thickness that can absorb the pushing amount even when the pushing amount reaches the maximum. Thereby, it is possible to prevent the lever 112 and the like from being deformed by the pressing rod 50a. In the present embodiment, the thickness of the elastic member 130 is 6 [mm].

  Further, as shown in FIG. 5, a connection terminal 113 is provided on the device side surface 110 b of the interlock switch 110. For this reason, the elastic member 130 that contacts the device-side side surface 110b of the interlock switch 110 and the connection terminal are disposed at a close position. When the elastic member 130 is made of a non-insulating material, if the elastic member 130 and the connection terminal 113 come into contact with each other by any reason, there is a possibility that a short circuit may occur and a malfunction such as failure of the device or the interlock switch may occur. is there. For this reason, the elastic member 130 is preferably made of a non-insulating material.

Furthermore, the elastic member 130 is preferably formed of a member that has a low compressive residual strain and can maintain resilience over a long period of time. When the elastic member 130 is a member having a high compression residual strain, the resilience cannot be maintained due to the sag of the elastic member 130. If the resilience of the elastic member 130 cannot be obtained, the urging force of the elastic member 130 toward the door will be smaller than the urging force of the button 111 toward the door. If the urging force of the elastic member 130 to the door side is smaller than the urging force of the button 111 to the door side, when the lever is pressed with the pressing rod 50a, the button does not move into the switch by the lever. In addition, the entire interlock switch rotates. As a result, even when the door is closed, the button does not move into the switch and the switch does not switch to the ON state.
Further, as described above, the elastic member 130 is compressed when the first opening / closing door 50 is closed. Since most of the first open / close door 50 is in a closed state, the elastic member 130 has been compressed for a long period of time. When the elastic member 130 is a member having a high compressive residual strain, the elastic member 130 is bent and the resilience cannot be maintained. Then, with the door closed, the interlock switch body is rotated toward the apparatus body by the biasing force of the button 111 of the interlock switch 110. Then, the button 111 protrudes from the interlock switch body, and the switch of the interlock switch 110 changes from the ON state to the OFF state. As a result, an image cannot be formed. However, if the elastic member 130 is made of a member that has a low compressive residual strain and can maintain the initial thickness over a long period of time, the resilience of the elastic member 130 can be maintained over time, and the above-described problems occur. Can be suppressed.

  The compression set of the elastic member 130 is obtained according to the conditions of JIS-K6410. Specifically, it is left at 70 ° C. for 22 hours after 50% compression, and then released. And it is the value which calculated | required the thickness change after 30-minute diameter excess after releasing. The compression set of the elastic member 130 is preferably (1/2) (1 [mm] / elastic member thickness [mm]) × 100 [%] or less. When the compression set of the elastic member 130 is (1/2) (1 [mm] / thickness of the elastic member [mm]) × 100 [%] or more, a sufficient repulsive force is obtained over time when the push-in amount is minimum. It cannot be obtained, and the above-described problems occur. In this embodiment, since the thickness of the elastic member is 6 [mm], the compression set is preferably (1/2) (1/6) × 100 = 8 [%] or less.

  As described above, the elastic member 130 used in the present embodiment is preferably an insulating member having a compression set of 8% or less and a foam made of high-density microcell urethane foam or silicon foam. . Specifically, PORON (trademark), Nannex (trademark) BF-1000, and HT-800 series are preferable.

  Next, the interlock switch unit 100 is not limited to the above and can be variously changed. For example, as shown in FIG. 7, the elastic member 130 may be configured by a spring. In this case, it is preferable to make the spring insulative by configuring the spring with an insulative material or by coating an insulative material on a non-insulating member such as metal. Thereby, a short circuit due to contact with the terminal 113 can be prevented.

Further, as shown in FIG. 8 and FIG. 9, the interlock switch unit 100 may be rotatably attached to the apparatus main body to absorb the pushing of the pressing rod 50a. In this case, as shown in FIGS. 8 and 9, the interlock switch 110 is fixed to the bracket 120 with two screws 141 and 142. The side plate 121 of the bracket is rotatably attached to the side wall 72 of the apparatus main body by a screw 125. Then, the elastic member 130 is attached to the back plate 122 of the bracket 120 and brought into contact with the wall surface 71 facing the opening / closing door 50 of the apparatus main body. 8 uses the elastic member 130 as a foam, and FIG. 9 uses the elastic member 130 as a spring.
As shown in FIGS. 8 and 9, when the open / close door is closed, the pressing rod 50a provided on the open / close door 50 comes into contact with the lever 112 and pushes the button 111 of the interlock switch 110 into the switch. When the lever 112 is in contact with the door side surface 110a of the interlock switch and is further pushed by the pressing rod 50a, the bracket 120 rotates in the direction of the arrow c around the place where it is attached to the side wall 72 of the apparatus body. To do. Then, the elastic member 130 is elastically deformed and urges the bracket 120 toward the door. Then, the open / close door is closed in a state where the bracket 120 is biased toward the door by the repulsive force of the elastic member 130. Also in the interlock switch unit 100 shown in FIGS. 8 and 9, the pushing amount of the pressing rod 50 a can be absorbed, and damage to the interlock switch 110 can be suppressed. Further, since the interlock switch 110 is urged to the door side together with the bracket 120 by the elastic member 130, when the pressing rod 50a pushes the interlock switch 110, the interlocking force is generated by the pressing force of the pressing rod. The switch of the switch 110 can be switched from the OFF state to the ON state.

Further, as shown in FIGS. 10 and 11, the interlock switch 110 can be directly pivotally attached to the side wall 72 of the apparatus main body, so that the bracket 120 can be eliminated. Thus, since the bracket 120 can be eliminated, the number of parts is reduced, and the interlock switch unit 100 can be made inexpensive.
In the interlock switch unit 100 shown in FIGS. 10 and 11, the interlock switch 110 is rotatably attached to the side wall 72 of the apparatus main body by a screw 141. An elastic member 130 is attached to the device main body side surface 110b of the interlock switch 110 and is in contact with the wall surface 71 facing the opening / closing door of the device main body. In FIG. 10, the elastic member 130 is a foam, and in FIG. 11, the elastic member 130 is a spring. The interlock switch 110 shown in FIG. 11 is provided with a connection terminal on the upper surface of the interlock switch so that the connection terminal 113 does not contact the spring and cause a short circuit.
In the interlock switch unit 100 shown in FIGS. 10 and 11, as described above, the lever is pushed by the pressing bar 50a provided on the opening / closing door, and the pressing bar 50a is further moved from the state where the interlock switch is turned on. The interlock switch 110 is rotated about the screw 125 toward the apparatus main body side. Then, the elastic member 130 is elastically deformed and biases the interlock switch 110 toward the door. The open / close door is closed in a state where the interlock switch 110 is urged toward the door by the repulsive force of the elastic member 130. Thereby, the pushing amount of the pressing rod 50a can be absorbed, and damage to the interlock switch 110 can be suppressed. Further, since the interlock switch 110 is urged to the door side by the elastic member 130, when the pressing rod 50a pushes the interlock, the switch of the interlock switch 110 is pressed by the pressing force of the pressing rod. It can be switched from the OFF state to the ON state.

Furthermore, as shown in FIG. 12, the interlock switch 110 may be attached to a wall surface 71 facing the opening / closing door of the apparatus main body via an elastic member 130. In this case, the interlock switch 110 is fixed to one surface of the elastic member 130 on the side surface of the device main body via an adhesive or the like. Then, the other surface of the elastic member 130 is fixed to the wall surface 71 facing the opening / closing door of the apparatus body via an adhesive or the like. Thereby, it is not necessary to attach the interlock switch unit 100 to the apparatus main body with screws or the like, and the interlock switch unit 100 can be easily attached.
In the interlock switch unit 100 shown in FIG. 12, when the lever 112 is pushed by the pushing rod 50a and the pushing rod 50a is further pushed from the state where the switch is turned on, the entire interlock switch 110 is elastic member. It moves to the apparatus main body side while deforming 130. Thus, also in the interlock switch unit 100 shown in FIG. 12, the pushing amount of the pressing rod 50a can be absorbed by the elastic member. Further, since the interlock switch 110 is urged to the door side, when the pressing rod 50a pushes the interlock, the interlock switch 110 is switched from the OFF state to the ON state by the pressing force of the pressing rod. You can switch to

  In the present embodiment, the example in which the interlock switch is provided on the apparatus main body side has been described. However, the interlock switch may be provided on the door side, and a pressing rod may be provided on the apparatus main body side. In the present embodiment, the interlock switch unit has been described as an example. However, the present invention is not limited to this, and the switch unit of the present invention can also be used for the detection member 63 that detects opening / closing of the door. Further, the switch unit of the present embodiment can be used for various opening / closing doors as well as the image forming apparatus.

(1)
As described above, according to the door switch unit of the present embodiment, even if the pressing amount of the pressing rod 50a varies due to the dimensional error of the pressing rod 50a as the pressing means, the assembly error of the door, or the like, the interlock The switch can be switched and damage to the interlock switch can be suppressed.
(2)
Moreover, according to the door switch unit of this embodiment, the said elastic member 130 is comprised with the insulator. As a result, even if the connection terminal 113 and the elastic member come into contact with each other by any moment, there is no short circuit. For this reason, malfunctions, such as a device and an interlock switch failing by a short circuit, can be suppressed.
(3)
In addition, according to the door switch unit of the present embodiment, a compression residual strain test based on JIS-K6401 (the elastic member is compressed by 50 [%] and left at 70 [deg.] C. for 22 hours, then released and after 30 minutes in diameter excess. The compression residual strain of the elastic member 130 obtained by the compression residual strain is set to 8 [%] or less. Thereby, the urging | biasing force to the door side of an elastic member can be kept more than the urging | biasing force to the door side of the button 111 over a long term. As a result, when the interlock switch 110 is pressed with the pressing rod 50a, the button 111 of the interlock switch 110 is not pushed into the switch, and only the elastic member is deformed and the door is closed for a long time. Can be suppressed. Therefore, the switch can be turned on and off by opening and closing the door over a long period of time.
(4)
Further, according to the door switch unit of the present embodiment, the back surface portion facing the surface opposite to the surface facing the pressing rod 50a of the interlock switch is provided on the bracket 120, and the back surface portion and the interlock switch 110 are pushed. The elastic member is provided between the pressure rod 50a and the surface opposite to the surface facing the pressure rod 50a. As a result, even if the apparatus main body does not have a wall surface opposite to the surface opposite to the surface facing the pressing pressure bar 50a of the interlock switch, the surface opposite to the surface facing the pressing pressure bar 50a of the interlock switch. The interlock switch 110 can be urged by the elastic member 130 toward the pressure bar 50a.
(5)
In addition, as shown in FIG. 12, when the interlock switch 110 is attached to the apparatus main body via the elastic member 130, the interlock switch 110 is greatly displaced in the depth direction or the vertical direction with respect to the apparatus main body due to an attachment error. There is. If the interlock switch 110 is greatly displaced in the depth direction or the vertical direction in this way, the pressing bar cannot be brought into contact with the lever of the interlock switch 110, and the switch is turned ON / OFF by the opening / closing operation of the door. You might not be able to do it. However, in the door switch unit of the present embodiment, a shaft hole or a shaft is provided in the apparatus main body, and an interlock switch is attached to the shaft hole or the shaft so as to be rotatable in the pressing direction. In this way, by attaching the interlock switch to the shaft hole or shaft of the apparatus main body, it is possible to attach the interlock switch at a position where the pressing rod contacts the lever of the interlock switch 110 without causing a large attachment error. it can.
(6)
Further, according to the image forming apparatus of the present embodiment, by using the door switch unit having the feature points (1) to (5) described above, the pressing means can be pressed due to a dimensional error of the pressing means, a door assembly error, or the like. Even if the pushing amount of the means varies, the switch can be switched and damage to the switch can be suppressed.

1 is a front view showing a schematic configuration of an image forming apparatus. (A) is a figure which shows the position of each opening / closing door of an image forming apparatus, (b) is a figure which shows the state which each opening / closing door opened. It is a perspective view of a 1st opening / closing door. It is an enlarged view of the periphery of a hole provided in the device side facing the first opening / closing door. The schematic perspective view of an interlock switch unit. The figure explaining operation | movement of an interlock switch unit. The figure which shows the example which used the elastic member of the interlock switch unit as the spring. The figure which shows the example which attached the interlock switch unit to the apparatus main body so that rotation was possible. The figure which shows the example which used as the spring the elastic member of the interlock switch unit attached to the apparatus main body so that rotation was possible. The figure which shows the example which attached the interlock switch directly to the side wall of the apparatus main body so that rotation was possible. The figure which shows the example which used as a spring the elastic member of the interlock switch unit which attached the interlock switch directly to the side wall of the apparatus main body so that rotation was possible. The figure which shows the example which attached the interlock switch to the wall surface facing the opening / closing door of an apparatus main body through an elastic member. The schematic block diagram of the conventional interlock switch unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 7 Paper discharge tray 11 Image reading part 23 Carriage 41 Paper feed cassette 50 1st opening / closing door 100 Interlock switch unit 110 Interlock switch 111 Button 112 Lever 113 Connection terminal 120 Bracket 130 Elastic member

Claims (6)

A switch is provided on one of the casing or the door that opens and closes the casing, and a pressing means that presses the switch is provided on the other, and the pressing means presses the switch by opening and closing the door. In the door switch unit that switches ON / OFF
A switch unit comprising: an elastic member configured to move the switch at least with respect to a pressing direction of the pressing means and biasing the switch in a direction opposite to the pressing direction of the pressing means. The switch unit of claim 1,
A switch unit characterized in that the elastic member is made of an insulator. The switch unit according to claim 1 or 2,
Of the elastic member obtained by a compression residual strain test based on JIS-K6401 (compressed residual strain after compressing the elastic member by 50 [%] to 70 [° C.], leaving it for 22 hours, and then releasing and compressing after 30 minutes diameter). A switch unit characterized by having a compression residual strain of 8% or less. The switch unit according to any one of claims 1 to 3,
A bracket is attached to either the housing or the door and supports the switch, and the bracket includes a back portion facing a surface opposite to the surface of the switch facing the pressing means, A switch unit, wherein the elastic member is provided between a back surface and a surface opposite to the surface of the switch facing the pressing means. The switch unit according to any one of claims 1 to 4,
The casing or door to which the switch is attached is provided with a shaft hole or a shaft for mounting the switch, and the switch is attached to the shaft hole or the shaft so as to be rotatable in the pressing direction. A switch unit characterized by being In an image forming apparatus provided with switch means for turning on / off a predetermined power source in the apparatus by opening / closing operation of a door for opening / closing a housing,
An image forming apparatus using the switch unit according to claim 1 as the switch means.

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