JP2021067777A - Image forming apparatus - Google Patents

Abstract

To provide an image forming apparatus that can appropriately press an interlock switch with a projection member, while ensuring the strength of the projection member.SOLUTION: An image forming apparatus 1 comprises: an apparatus body 2; an opening and closing cover 21 that is rotatable centered on a rotation axis 22X and can open and close an opening 2A of the apparatus body 2; an interlock switch 94 that detects open and close of the opening and closing cover 2; and a projection member 8 that projects from the opening and closing cover 21 and presses the interlock switch 94 when the opening and closing cover 21 is closed. The projection member 8 has a flat plate part 81 that presses the interlock switch 94 and can be elastically deformed, and a surrounding part 82 that surrounds the periphery of the flat plate part 81. The flat plate part 81 has a contact surface 811a that is brought into contact with the interlock switch 94. The surrounding part 82 has a leading end guard part 821 that is arranged on a leading end of the flat plate part 81. A first rotation track TR1 of the contact surface 811a is located closer to the rotation axis 22X than a second rotation track TR2 of an under surface 8211a at the leading end guard part 821.SELECTED DRAWING: Figure 8

Description

The present invention relates to an image forming apparatus.

Conventionally, as disclosed in Patent Document 1, an apparatus main body having an opening, an opening / closing cover capable of opening / closing the opening of the apparatus main body, an interlock switch for detecting the opening / closing of the opening / closing cover, and a protrusion protruding from the opening / closing cover. An image forming apparatus is known that is provided and includes a protruding member that presses an interlock switch when the open / close cover is closed.

In an image forming apparatus having such a configuration, the protruding member presses the interlock switch to detect that the open / close cover is closed, and allows the image forming portion housed in the apparatus main body to operate, and projects. When the member does not press the interlock switch, the operation of the image forming portion is stopped so that the laser beam emitted from the image forming portion is suppressed from being exposed to the outside through the opening of the main body of the apparatus. There is.

Japanese Unexamined Patent Publication No. 2016-1260227

However, in the above image forming apparatus, since the rigidity of the projecting member is high, if the relative positions of the projecting member and the interlock switch vary, the projecting member presses the interlock switch more than necessary to interlock. Excessive load may be applied to the switch and the interlock switch may be damaged.

As a measure to prevent an excessive load from being applied to the interlock switch when the relative positions of the projecting member and the interlock switch vary, elasticity is applied to the projecting member to provide elasticity to the projecting member and the interlock switch. It is conceivable to absorb the positional variation with the lock switch, but simply imparting elasticity to the projecting member reduces the strength of the projecting member, causing problems such as the projecting member being deformed by an external force.

The present invention has been made to solve the above problems, and the interlock switch is provided by the projecting member even when the position variation occurs between the projecting member and the interlock switch while ensuring the strength of the projecting member. Provided is an image forming apparatus capable of appropriately pressing.

An image forming apparatus that solves the above problems has the following features.

That is, the image forming apparatus is provided on the device main body having an opening, an opening / closing cover that is rotatable about the rotation axis and can open and close the opening of the device main body, and the device main body. The interlock switch for detecting the opening and closing of the opening / closing cover and the protruding member provided so as to project from the opening / closing cover and press the interlock switch when the opening / closing cover is closed are provided, and the protruding member is the interlock. It has a flat plate portion that can be elastically deformed by pressing the lock switch and an enclosure portion that surrounds the flat plate portion. The flat plate portion is located at the tip end portion of the flat plate portion, and the interlock switch is operated. The enclosure has a contact surface that comes into contact with the interlock switch when pressed, and the enclosure has a tip guard portion located on the tip side of the flat plate portion, and the rotation axis of the contact surface is attached. The centered first rotation locus is located closer to the rotation axis than the second rotation locus centered on the rotation axis on the surface of the tip guard portion facing the rotation axis. ..

In this way, since the flat plate portion of the protruding member can be elastically deformed, even if the relative positions of the protruding member and the interlock switch vary, the elastic deformation of the flat plate portion absorbs the positional variation and the flat plate portion. It is possible to press the interlock switch with an appropriate pressing force. Further, by surrounding the flat plate portion formed so as to be elastically deformable by the surrounding portion and protecting it, it is possible to secure the strength of the projecting member as a whole. Further, since the first rotation locus of the contact surface in the flat plate portion is located closer to the rotation axis than the second rotation locus of the surface facing the rotation axis in the tip guard portion, the open / close cover is opened. When closing, the interlock switch can be appropriately pressed by the flat plate portion.

Further, the flat plate portion has a proximal end portion located closer to the proximal end portion than the distal end portion, and the proximal end portion is smaller in thickness than the distal end portion.

As a result, when the interlock switch is pressed by the tip of the flat plate portion, the base end portion is easily elastically deformed, and the interlock switch can be pressed by the tip portion with a more appropriate pressing force.

Further, the enclosure portion has a side wall portion located outside the flat plate portion in a direction along the rotation axis, and the side wall portion extends toward a direction closer to the rotation axis than the flat plate portion. There is.

This makes it possible to effectively protect the flat plate portion against external forces from the left and right sides.

Further, the length of the side wall portion in the radial direction of the first rotation locus increases from the tip end side to the base end side in the protrusion direction of the projecting member.

As a result, it is possible to improve the strength of the side wall portion while reducing the space occupied by the tip portion of the protruding member that abuts on the interlock switch.

Further, the tip guard portion has a central portion facing the flat plate portion and side end portions located on both sides of the central portion in a direction along the rotation axis, and the side end portion is the center. The length of the second rotation locus in the radial direction is larger than that of the portion.

Thereby, it is possible to improve the strength of the tip guard portion by the side end portion.

Further, in the process of closing the opening / closing cover, the surface of the tip guard portion facing the rotation axis abuts on the interlock switch, and then the abutting surface of the flat plate portion abuts on the interlock switch. ..

As a result, the interlock switch that is pushed down by contacting the tip guard portion can be further pushed down by the flat plate portion after being brought into contact with the contact surface, and the interlock switch can be appropriately pressed by the flat plate portion. It is possible.

According to the present invention, the interlock switch can be pressed by the projecting member with an appropriate pressing force even when the relative positions of the projecting member and the interlock switch vary while ensuring the strength of the projecting member. ..

It is a schematic side sectional view which shows the image forming apparatus. It is a block diagram which shows the electrical structure of an image forming apparatus. It is a schematic perspective view which shows the apparatus main body. It is a perspective view which looked at the projecting member from the rear diagonally above. It is a perspective view which looked at the projecting member from the rear diagonally lower part. It is a side sectional view which shows the projecting member. (A) is a rear view showing a protruding member, and (b) is a rear sectional view showing a protruding member. It is a side sectional view which shows the rotation locus of each part in a protruding member. It is a side sectional view which shows how the protruding member presses an interlock switch when closing an opening / closing cover.

Next, a mode for carrying out the present invention will be described with reference to the accompanying drawings.

[Overall configuration of image forming apparatus]
The image forming apparatus 1 shown in FIG. 1 is an embodiment of the image forming apparatus according to the present invention, and includes an apparatus main body 2, a paper feeding unit 3, an image forming unit 5, and an discharging unit 7. The image forming unit 5 forms an image on the sheet S, and the paper feeding unit 3 supplies the sheet S to the image forming unit 5. The discharging unit 7 discharges the sheet S on which the image is formed by the image forming unit 5 to the outside of the apparatus main body 2.

In the following description, the right side in FIG. 1 is defined as the front side of the image forming apparatus 1, the left side in FIG. 1 is defined as the rear side of the image forming apparatus 1, and the front side of the paper surface in FIG. 1 is the left side of the image forming apparatus 1, in FIG. The back side of the paper surface is defined as the right side of the image forming apparatus 1. Further, the upper side and the lower side in FIG. 1 are defined as the upper side and the lower side of the image forming apparatus 1, respectively.

The apparatus main body 2 is a box body formed in a substantially rectangular parallelepiped shape, and houses a paper feeding unit 3, an image forming unit 5, and a discharging unit 7. The apparatus main body 2 includes an opening 2A that opens to the front surface and an opening / closing cover 21 that can open and close the opening 2A. The opening / closing cover 21 is located at the lower end of the opening / closing cover 21 and is configured to be rotatable around the rotation axis 22X of the rotation shaft 22 extending in the left-right direction. The opening / closing cover 21 rotates around the rotation axis 22X to open / close the opening 2A.

The upper surface of the apparatus main body 2 is covered with the upper surface cover 23. A discharge tray 23a is formed on the top cover 23. In the apparatus main body 2, a transport path P for the sheet S from the paper feed unit 3 to the discharge unit 7 via the image forming unit 5 is configured.

The paper feed unit 3 includes a paper feed tray 10, a paper feed roller 31, a separation roller 32, a separation pad 33, a transport roller pair 34, and a resist roller pair 35.

The paper feed tray 10 supports a plurality of sheets S in a stacked state. The sheet S supported by the paper feed tray 10 is fed out to the separation roller 32 side by the paper feed roller 31, and is separated one by one by the separation roller 32 and the separation pad 33 and sent out to the transport path P.

The sheet S sent out to the transport path P is transported toward the transport roller pair 34 arranged on the downstream side of the separation roller 32 in the transport path P. The sheet S conveyed to the transfer roller pair 34 is further conveyed toward the resist roller pair 35 arranged on the downstream side of the transfer roller 34 pair.

The resist roller pair 35 corrects the posture of the sheet S by temporarily stopping the movement of the tip of the sheet S to be conveyed. After that, the resist roller pair 35 conveys the sheet S toward the transfer position of the image forming unit 5 at a predetermined timing.

The image forming unit 5 is arranged above the paper feed tray 10, and is the surface of the process cartridge 50 for transferring an image to the surface of the sheet S conveyed from the paper feed unit 3 and the surface of the photoconductor drum 54 of the process cartridge 50. The exposure unit 56 for exposing the image and the fixing unit 60 for fixing the image transferred to the sheet S by the process cartridge 50 are provided.

The process cartridge 50 includes a developing roller 53, a photoconductor drum 54, a transfer roller 55, and the like. The exposure unit 56 includes a laser diode, a polygon mirror, a lens, a reflector, and the like, and by irradiating the photoconductor drum 54 with a laser beam based on the image data input to the image forming apparatus 1, the exposure unit 56 is provided. The surface of the photoconductor drum 54 is exposed.

The photoconductor drum 54 is arranged adjacent to the developing roller 53. The surface of the photoconductor drum 54 is uniformly positively charged by a charger (not shown) and then exposed by the exposure unit 56. The exposed portion of the photoconductor drum 54 has a lower potential than the other parts, and an electrostatic latent image based on the image data is formed on the photoconductor drum 54. Then, a positively charged toner is supplied from the developing roller 53 to the surface of the photoconductor drum 54 on which the electrostatic latent image is formed, so that the electrostatic latent image is visualized and becomes a developer image. ..

The transfer roller 55 is arranged to face the photoconductor drum 54, and a negative transfer bias is applied by a bias applying means (not shown). With the transfer bias applied to the surface of the transfer roller 55, the sheet S is conveyed between the photoconductor drum 54 on which the developer image is formed and the transfer roller 55 (transfer position) without sandwiching the sheet S. The developer image formed on the surface of the photoconductor drum 54 is transferred to the surface of the sheet S.

The fixing unit 60 includes a heating roller 61 and a pressure roller 62. The heating roller 61 is rotationally driven by a driving force (not shown) included in the apparatus main body 2, and the heating roller 61 is heated by supplying electric power from a power source (not shown) included in the apparatus main body 2. The pressure roller 62 is arranged to face the heating roller 61, and is brought into close contact with the heating roller 61 to rotate in a driven manner. When the sheet S on which the developer image is transferred is conveyed to the fixing unit 60, the sheet S is conveyed while being sandwiched between the heating roller 61 and the pressurizing roller 62, and the developer image is fixed on the sheet S. ..

The discharge unit 7 includes a discharge roller pair 71, and discharges the sheet S conveyed from the fixing unit 60 toward the outside of the apparatus main body 2. Specifically, the sheet S conveyed from the fixing unit 60 is discharged to the discharge tray 23a formed on the upper surface cover 23 by the discharge roller pair 71.

The apparatus main body 2 is provided with an interlock switch 94 for detecting the opening / closing of the opening / closing cover 21, and the opening / closing cover 21 is provided with a protruding member 8 for pressing the interlock switch 94 when the opening / closing cover 21 is closed. There is. The interlock switch 94 detects that the open / close cover 21 is closed when pressed by the protruding member 8, and detects that the open / close cover 21 is open when not pressed by the protruding member 8. It is configured in.

As shown in FIG. 2, the image forming apparatus 1 has an ASIC (Application Specific Integrated Circuit) 90 that controls the operation of the image forming unit 5 and the like. The ASIC 90 has a CPU 91. The CPU 91 controls each unit such as the image forming unit 5 by executing programs for various processes based on the information input to the ASIC 90.

The ROM 92, the RAM 93, the interlock switch 94, and the image forming unit 5 are connected to the ASIC 90. The ROM 92 stores a program executed by the CPU 91, various data, and the like. The RAM 93 is used as a work area when the CPU 91 executes a program. Further, various data and the like are temporarily stored in the RAM 93.

When the CPU 91 detects that the interlock switch 94 is pressed by the projecting member 8 and the open / close cover 21 is closed, the CPU 91 allows the image forming unit 5 to operate, and the interlock switch 94 is pressed by the projecting member 8. When it is detected that the open / close cover 21 is open, the operation of the image forming unit 5 is stopped.

By stopping the operation of the image forming unit 5 when the opening / closing cover 21 is open in this way, the laser beam emitted from the exposure unit 56 of the image forming unit 5 is exposed to the outside from the opening 2A of the apparatus main body 2. It suppresses doing.

As shown in FIG. 3, the apparatus main body 2 has a pair of left frame 24L and right frame 24R arranged apart from each other in the left-right direction. The left frame 24L and the right frame 24R extend in the front-rear direction and the up-down direction, and are opened in the area surrounded by the left frame 24L, the right frame 24R, and the upper surface cover 23 at the front ends of the left frame 24L and the right frame 24R. Part 2A is formed.

An opening / closing cover 21 is arranged in front of the left frame 24L and the right frame 24R. The interlock switch 94 is provided inside the left frame 24L, and a switch opening 241a is formed in the front end surface 241 of the left frame 24L.

The projecting member 8 projects rearward from the opening / closing cover 21 in a state where the opening / closing cover 21 is closed, and is configured to be integrally rotatable with the opening / closing cover 21 around the rotation axis 22X. When the opening / closing cover 21 is closed, the projecting member 8 enters the left frame 24L through the switch opening 241a and presses the interlock switch 94. Further, when the opening / closing cover 21 is open, the protruding member 8 does not come out of the switch opening 241a and press the interlock switch 94 in the left frame 24L.

[Protruding member]
Next, the protruding member 8 will be described. As shown in FIGS. 4 to 8, the opening / closing cover 21 has a support portion 21a, and the projecting member 8 is supported by the support portion 21a. The projecting member 8 projects rearward from the open / close cover 21 in the closed state. The projecting member 8 has a flat plate portion 81 formed in a flat plate shape, and an enclosure portion 82 surrounding the flat plate portion 81.

The projecting member 8 is integrally molded with the opening / closing cover 21, and the flat plate portion 81 and the surrounding portion 82 of the projecting member 8 are integrally molded. By integrally molding the projecting member 8 and the opening / closing cover 21 and integrally molding the flat plate portion 81 and the surrounding portion 82, the projecting member 8 can be easily formed on the opening / closing cover 21, and the image forming apparatus 1 It is possible to reduce the number of parts.

The flat plate portion 81 extends rearward from the opening / closing cover 21 in a state where the opening / closing cover 21 is closed. The flat plate portion 81 is a portion that presses the interlock switch 94 when the opening / closing cover 21 is closed, and is configured to be elastically deformable. As shown in FIG. 4, the left-right dimension D1 of the flat plate portion 81 is formed to be smaller than the left-right dimension D2 of the support portion 21a that supports the projecting member 8, and the flat plate portion 81 is easily elastically deformed. It is possible.

The flat plate portion 81 has a tip end portion 811 and a base end portion 812, and the base end portion 812 is arranged in front of the tip end portion 811. That is, in the flat plate portion 81, the base end portion 812 is located closer to the base end portion than the tip end portion 811.

The tip portion 811 of the flat plate portion 81 has a contact surface 811a that comes into contact with the interlock switch 94 when the flat plate portion 81 presses the interlock switch 94. In the tip portion 811, the lower surface, which is the surface facing the rotation axis 22X, is the contact surface 811a. The base end portion 812 of the flat plate portion 81 has a lower surface 812a which is a surface on the side facing the rotation axis 22X.

The contact surface 811a of the tip portion 811 is formed in an arc shape centered on the rotation axis 22X, and is curved downward as the opening / closing cover 21 is moved backward from the opening / closing cover 21 in a closed state. .. As shown in FIG. 8, the contact surface 811a moves along the first rotation locus TR1 when the opening / closing cover 21 rotates about the rotation axis 22X. The first rotation locus TR1 is an arc-shaped locus centered on the rotation axis 22X and having a radius R1.

The lower surface 812a of the base end portion 812 is formed in an arc shape centered on the rotation axis 22X, and is curved downward as the opening / closing cover 21 is moved backward from the opening / closing cover 21 in a closed state. As shown in FIG. 8, the lower surface 812a moves along the third rotation locus TR3 when the opening / closing cover 21 rotates about the rotation axis 22X. The third rotation locus TR3 is an arc-shaped locus centered on the rotation axis 22X and having a radius R3.

As shown in FIG. 6, in the flat plate portion 81, the thickness t2 of the base end portion 812 is formed to be smaller than the thickness t1 of the tip portion 811, and the first rotation locus TR1 on the contact surface 811a of the tip portion 811. The radius R1 of is smaller than the radius R3 of the third rotation locus TR3 on the lower surface 812a of the base end portion 812. As a result, the contact surface 811a of the tip end portion 811 is located closer to the rotation axis 22X than the lower surface 812a of the base end portion 812. However, the thickness t2 of the base end portion 812 and the thickness t1 of the tip end portion 811 can be the same thickness.

The enclosure 82 includes a tip guard portion 821 located on the rear side of the projecting member 8 on the tip side of the flat plate portion 81, and a side wall portion 822 located on the left and right outer sides of the flat plate portion 81 in the direction along the rotation axis 22X. And have.

The tip guard portion 821 has a central portion 8211 facing the flat plate portion 81, and side end portions 8212 located on both left and right sides of the central portion 8211 in the direction along the rotation axis 22X. The central portion 8211 has a lower surface 8211a which is a surface on the side facing the rotation axis 22X.

The lower surface 8211a of the central portion 8211 is formed in an arc shape centered on the rotation axis 22X, and is curved downward as the opening / closing cover 21 is moved backward from the opening / closing cover 21 in a closed state. As shown in FIG. 8, the lower surface 8211a moves along the second rotation locus TR2 when the opening / closing cover 21 rotates about the rotation axis 22X. The second rotation locus TR2 is an arc-shaped locus centered on the rotation axis 22X and having a radius R2.

The radius R1 of the first rotation locus TR1 of the contact surface 811a of the flat plate portion 81 is smaller than the radius R2 of the second rotation locus TR2 of the lower surface 8211a of the tip guard portion 821, and the radius R2 of the contact surface 811a is smaller. The 1 rotation locus TR1 is located closer to the rotation axis 22X than the second rotation locus TR2 on the lower surface 8211a.

The central portion 8211 extends in the left-right direction behind the flat plate portion 81, and the side end portion 8212 extends downward from the left and right ends of the central portion 8211. As shown in FIG. 7B, the length of the central portion 8211 in the radius R2 direction is L1, and the length of the side end portion 8212 in the radius R2 direction is L2. The length L2 of the side end portion 8212 is larger than the length L1 of the central portion 8211. However, the length L2 of the side end portion 8212 and the length L1 of the central portion 8211 may be the same length.

The side wall portion 822 extends closer to the rotation axis 22X than the flat plate portion 81 on the left and right outer sides of the flat plate portion 81, and covers the left and right side portions of the flat plate portion 81 as a whole. However, the side wall portion 822 can be formed to have the same thickness as the flat plate portion 81 in the radius R1 direction. Even in this case, the side wall portion 822 can cover the left and right side portions of the flat plate portion 81 as a whole.

The upper end of the side wall portion 822 is curved downward as the distance from the opening / closing cover 21 is rearward, and the lower end of the side wall portion 822 extends horizontally from the opening / closing cover 21 toward the rear. As a result, the length of the first rotation locus TR1 of the side wall portion 822 in the radius R1 direction increases from the tip end side to the base end side in the projecting direction of the projecting member 8. For example, as shown in FIG. 6, the length L4 in the radius R1 direction on the proximal end side of the side wall portion 822 is larger than the length L3 in the radius R1 direction on the tip end side of the side wall portion 822.

However, the length of the side wall portion 822 in the radius R1 direction may be the same regardless of the position of the protruding member 8 in the protruding direction. For example, the length L3 on the tip end side of the side wall portion 822 and the length L4 on the base end side of the side wall portion 822 may be the same length.

As shown in FIG. 9, the interlock switch 94 has a switch body 941 and contacts 942 rotatably supported by the switch body 941.

The projecting member 8 enters the inside of the left frame 24L from the switch opening 241a in the process of closing the open / close cover 21 in the open state, and approaches the interlock switch 94 (see FIG. 9A).

When the opening / closing cover 21 is closed from the state shown in FIG. 9A, as shown in FIG. 9B, the contact surface 811a of the flat plate portion 81 of the protruding member 8 becomes the contactor 942 of the interlock switch 94. And pushes the contactor 942 downward. When the contactor 942 is pushed downward by the flat plate portion 81, the interlock switch 94 detects that the open / close cover 21 is closed.

In this case, since the flat plate portion 81 having the contact surface 811a that abuts on the contact 942 of the interlock switch 94 is elastically deformable, the relative positions of the projecting member 8 and the interlock switch 94 vary. However, the elastic deformation of the flat plate portion 81 absorbs the positional variation, and the flat plate portion 81 can press the interlock switch 94 with an appropriate pressing force.

Further, in the flat plate portion 81, the thickness t2 of the base end portion 812 is formed to be smaller than the thickness t1 of the tip end portion 811. Therefore, when the interlock switch 94 is pressed by the tip end portion 811, the base end portion 812 is elastic. It becomes easy to be deformed, and the interlock switch 94 can be pressed with a more appropriate pressing force by the tip portion 811.

The strength of the flat plate portion 81 tends to decrease when the base end portion 812 is formed to have a thickness t2 smaller than the thickness t1 of the tip end portion 811 so as to be elastically deformable. By surrounding and protecting the projecting member 8 by 82, it is possible to secure the strength of the projecting member 8 as a whole.

Further, when the opening / closing cover 21 is closed and the contact surface 811a of the flat plate portion 81 is brought into contact with the contactor 942 of the interlock switch 94, the tip guard portion 821 approaches the interlock switch 94 before the flat plate portion 81. .. Then, in the process of closing the open / close cover 21, the lower surface 8211a of the tip guard portion 821 comes into contact with the interlock switch 94, and then the contact surface 811a of the flat plate portion 81 comes into contact with the interlock switch 94.

In this case, since the first rotation locus TR1 of the contact surface 811a in the flat plate portion 81 is located closer to the rotation axis 22X than the second rotation locus TR2 of the lower surface 8211a in the tip guard portion 821, the tip end. The contactor 942, which is brought into contact with the guard portion 821 and pushed down, can then be brought into contact with the contact surface 811a and further pushed down by the flat plate portion 81. As a result, the interlock switch 94 can be appropriately pressed by the flat plate portion 81.

However, in the process of closing the opening / closing cover 21, the tip guard portion 821 of the projecting member 8 does not abut on the contact 942 of the interlock switch 94, and only the contact surface 811a of the flat plate portion 81 hits the contact 942. It can also be configured to be in contact. As a result, there is no possibility that the tip guard portion 821 interferes with the contact 942, and the contact 942 can be pushed down only by the elastically deformable flat plate portion 81, and the interlock switch 94 can be appropriately pressed. Become.

Further, since the side wall portion 822 extends closer to the rotation axis 22X than the flat plate portion 81 and covers the left and right side portions of the flat plate portion 81 as a whole, the flat plate portion 81 is subjected to external force from the left and right sides. On the other hand, it is possible to effectively protect it.

Further, since the length of the side wall portion 822 in the radius R1 direction increases from the tip end side to the base end side in the protrusion direction of the protrusion member 8, the tip portion of the protrusion member 8 that abuts on the interlock switch 94 It is possible to improve the strength of the side wall portion 822 while reducing the space occupied.

Further, since the length L2 of the side end portion 8212 in the tip guard portion 821 is formed to be larger than the length L1 of the central portion 8211, the strength of the tip guard portion 821 can be improved by the side end portion 8212. It has become.

1 Image forming device 2 Device body 2A Opening 8 Protruding member 21 Opening / closing cover 22X Rotating axis 81 Flat plate 82 Enclosure 811 Tip 811a Contact surface 812 Base end 821 Tip guard 822 Side wall 8211 Central 8211a Bottom surface 8212 Side end 94 Interlock switch L1 (center) length L2 (side end) length L3 (on the tip side of the side wall) Length L4 (on the base end side of the side wall) length t1 (tip) (Part) thickness t2 (base end) thickness R1 (first rotation locus) radius R2 (second rotation locus) radius TR1 first rotation locus TR2 second rotation locus

Claims (6)

The device body with an opening and
An opening / closing cover that can rotate around the rotation axis and can open / close the opening of the device body.
An interlock switch provided on the main body of the device to detect the opening / closing of the opening / closing cover,
A projecting member that is provided so as to project from the opening / closing cover and presses the interlock switch when the opening / closing cover is closed.
The protruding member has a flat plate portion that can be elastically deformed by pressing the interlock switch, and an enclosure portion that surrounds the flat plate portion.
The flat plate portion is located at the tip end portion of the flat plate portion, and has an abutting surface that comes into contact with the interlock switch when the interlock switch is pressed.
The enclosure portion has a tip guard portion located on the tip side of the flat plate portion, and has a tip guard portion.
The first rotation locus centered on the rotation axis of the contact surface is more than the second rotation locus centered on the rotation axis of the surface of the tip guard portion facing the rotation axis. An image forming device located near the rotation axis. The flat plate portion has a proximal end portion located closer to the proximal end side than the distal end portion.
The image forming apparatus according to claim 1, wherein the base end portion has a thickness smaller than that of the tip end portion. The enclosure portion has a side wall portion located outside the flat plate portion in a direction along the rotation axis.
The image forming apparatus according to claim 1 or 2, wherein the side wall portion extends closer to the rotation axis than the flat plate portion. The side wall portion according to any one of claims 1 to 3, wherein the length of the first rotation locus in the radial direction increases from the distal end side to the proximal end side in the protruding direction of the protruding member. The image forming apparatus described. The tip guard portion has a central portion facing the flat plate portion and side end portions located on both sides of the central portion in a direction along the rotation axis.
The image forming apparatus according to any one of claims 1 to 4, wherein the side end portion has a larger length in the radial direction of the second rotation locus than the central portion. The claim that the contact surface of the flat plate portion abuts on the interlock switch after the surface of the tip guard portion facing the rotation axis abuts on the interlock switch in the process of closing the opening / closing cover. The image forming apparatus according to any one of 1 to 5.

Images