JP2012040796A - Cover member for electrical box, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover member that has a sufficient strength, shielding performance, and grounding performance as a cover member for an electrical box of an image forming apparatus, has superior operability for opening and closing of the cover member as well as excellent service performance, and can cut down cost.SOLUTION: There is provided the cover member 3 for an electrical box, which is metallic, whose planar shape is a polygon shape, and which has claw-shaped fixing members 5 formed near each angle of the polygon shape and at the center of each side except for one arbitrary side, and capable of being hooked up with the frame of the opening of the electrical box 2. The cover member 3 has a screw hole 4 for fixing, which is formed on the edge side having no claw-shaped fixing member 5 and at the center of the edge side, and the cover member 3 is fixed to the frame of the opening of the electrical box 2 with at least the claw-shaped fixing member 5.

Description

  The present invention relates to a cover member for an electrical equipment box for housing electrical equipment equipped in an image forming apparatus such as a printer or a facsimile, and more particularly to the structure of the cover member.

  In recent years, along with demands for colorization and higher speed, image forming apparatuses have rapidly increased the number of electrical components such as electrical boards that electrically control the device body, while reducing the installation space by reducing the size of the device body. It is also required to do. For this reason, it is possible to respond to the demand for space saving while responding to the rapid increase of such electrical components by collecting the electrical components as an electrical box on the back side of the equipment body and arranging the electrical boards etc. Things have been done.

  The electrical box is provided with a cover member serving as a lid, and a user or serviceman can perform maintenance of electrical components such as an electrical board disposed inside the electrical box by attaching and detaching the cover member ( For example, see Patent Documents 1 to 3).

  Patent Document 1 discloses an image forming apparatus in which an electrical board and an optional board are accommodated in a metal casing, and it is described that the shielding of electromagnetic waves and the like is good by using the metal casing. Has been. Patent Document 2 describes that as an electromagnetic shield for an electrical component, a flexible electromagnetic shield sheet in which a metal foil and a sheet-like resin are joined to an opening for maintenance of the electrical component is described. Patent Document 3 describes that a cover that covers an electrical unit is formed of a flexible resinous sheet material and is fitted with a snap-fit method.

  However, as a cover for the electrical box, a resin cover member is not sufficient in terms of strength, shielding properties, and grounding properties, and in the case of a strong metal member, a screw or the like is used to strengthen the ground. In the method of fixing by using a large number of engaging members, there are problems that the cost is increased due to an increase in the number of members, and that serviceability and work efficiency are reduced due to the complexity of the removal / attachment work.

  Therefore, the present invention has sufficient strength as a cover member for the electrical box of the image forming apparatus, shielding property and grounding property, and is excellent in operability and serviceability when the cover member is opened and closed, and can realize cost reduction. An object of the present invention is to provide a simple cover member.

The present invention provided to solve the above problems is as follows.
[1] In a cover member that covers the outer surface of the electrical box that houses electrical components,
The cover member is made of metal, the planar shape is a polygonal shape,
A hook-shaped claw-shaped fixing member that can be hooked to the frame of the electrical equipment box opening surface near each corner of the polygon and at the center of the edge excluding any one of the edges. A screw hole that can be fixed by a screw member is formed in the center of the end side that is formed and does not have the claw-shaped fixing means,
A cover member for an electrical box, wherein the cover member is fixed to a frame portion of the opening surface of the electrical box by at least the claw-shaped fixing means.
[2] The electrical equipment according to [1], wherein a shape of a side cross section of a surface of the claw-shaped fixing member that holds a frame portion of the electrical equipment box opening surface has an inclination that narrows from a tip to a base. It is a cover member of a box.
[3] The cover of the electrical box according to [1], wherein the claw-shaped fixing member has a plate spring shape having elasticity, and is biased in a direction sandwiching a frame portion of the opening surface of the electrical box. It is a member.
[4] The electrical box according to [1], wherein the hook portion of one claw-shaped fixing member is longer than the other claw-shaped fixing member among the plurality of claw-shaped fixing members. It is a cover member.
[5] An image forming apparatus comprising an electrical box having the electrical box cover member according to any one of [1] to [4].

As an effect of the present invention, according to the first aspect of the present invention, in the cover member that covers the outer surface of the electrical box that houses the electrical component, the cover member is made of metal, and the planar shape is a polygonal shape. A hook-shaped claw-shaped fixing member that can be hooked to the frame of the opening surface of the electrical box is formed in the vicinity of each corner of the square and in the center of the end of each end excluding any one end. An electrical box that is fixed to a frame portion of the opening surface of the electrical box by at least the claw-shaped fixing means, wherein a screw hole that can be fixed by a screw member is formed at a central portion of the end without the claw-shaped fixing means. Therefore, even when the cover member is large, the use of a screw member can be minimized, and the electrical equipment box and the cover member can be connected to each other without floating without using a gasket. Can be ground, with sufficient strength and shielding and grounding resistance and excellent in operability and serviceability of the opening and closing of the cover member, it is possible to realize a cost down.
According to the invention of claim 2, in the cover member of the electrical equipment box according to claim 1, the shape of the side cross section of the surface holding the frame portion of the electrical equipment box opening surface of the claw-like fixing member is from the tip to the base. Therefore, the cover member can be attached so as to be pressed against the electrical box when installed by sliding, and the grounding property can be improved without using a screw.
According to the invention of claim 3, in the cover member of the electrical equipment box according to claim 1, the claw-like fixing member has an elastic leaf spring shape, and sandwiches the frame portion of the electrical equipment box opening surface. When energized, the cover member can be attached so as to be more strongly pressed against the electrical box when installed, and the grounding property can be improved without using screws.
According to the invention of claim 4, in the cover member of the electrical equipment box according to claim 1, the length of the hook portion of one claw-like fixing member among the plurality of claw-like fixing members is other claw-like. Since it is longer than the fixing member, the claw-like fixing member having a long hooking portion is first attached, the installation position is fixed to some extent, and then the other claw-like fixing member is attached, so that the operability of attachment is improved. The ease of assembly can be improved.
According to the invention of claim 5, since the image forming apparatus includes the electrical box having the cover member of the electrical box according to any one of claims 1 to 4, the operability and serviceability when the cover member is opened and closed. In addition, the cost can be reduced.

1 is a rear external view of an example of an image forming apparatus of the present invention. It is an external view of the state which removed the exterior cover of the back in FIG. It is an external view of an electrical equipment box. It is an external view of the cover member of the electrical equipment box of the present invention. It is sectional drawing which shows the 1st embodiment of the cover member of the electrical equipment box of this invention. It is sectional drawing which shows the 2nd embodiment of the cover member of the electrical equipment box of this invention. It is sectional drawing which shows the 3rd embodiment of the cover member of the electrical equipment box of this invention. 1 is a schematic cross-sectional view showing an embodiment of an image forming apparatus of the present invention.

  Hereinafter, a cover member for an electrical box and an image forming apparatus according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and other embodiments, additions, modifications, deletions, and the like can be changed within a range that can be conceived by those skilled in the art, and any aspect is possible. As long as the functions and effects of the present invention are exhibited, the scope of the present invention is included.

1 and 2 are external views of the back surface of an example of the image forming apparatus, and FIG. 2 shows a state where the exterior cover of FIG. 1 is removed.
The image forming apparatus 1 has a configuration in which an opening is provided in the electrical box 2 and the opening is covered with a cover member 3 in order to attach and detach various components such as installation of an option board and expansion of a memory.
In order to shield the electromagnetic wave emitted from the substrate housed in the electrical box 2, the electrical box 2 and the cover member 3 are made of metal and fixed to each other in order to strengthen the ground. Conventionally, fixing has been performed using a large number of screw members. However, the cover member 3 of the present invention requires a minimum (specifically, one) screw to be used for the electrical component box 2. Or it can fix without using a screw.

FIG. 3 shows an external view of the electrical box 2 and FIG. 4 shows an external view of the cover member of the electrical box of the present invention.
The cover member 3 of the present invention is made of metal, the planar shape is a polygonal shape, near each corner of the polygon, and at the center of the end except for one end of each end, A hook-shaped claw-shaped fixing member 5 that can be hooked to the frame of the opening surface of the electrical box 2 is formed, and a screw hole 4 that can be fixed by a screw member is formed at the center of the end where there is no claw-shaped fixing means 5. It is formed and fixed to the frame part of the opening surface of the electrical equipment box 2 by at least the claw-shaped fixing means 5.

As shown in FIGS. 3 and 4, for example, in the quadrangular cover member 3, there are four locations near the four corners, and three locations at the center of the three sides of the four end sides excluding the upper end. A claw-shaped fixing member 5 is provided, and a screw hole 4 that can be fixed by a screw is provided in the center of the upper end side.
The claw-shaped fixing member 5 can be fixed to the frame of the opening of the electrical equipment box 2 by a snap-fit method. By fixing the part of the screw hole 4 with a screw member, the electrical box 2 and the cover member 3 can be grounded more firmly.
By adopting such a fixing method, even when the size of the cover member 3 is large, the use of the screw member can be minimized, the ease of attachment and removal of the cover member 3 and the improvement in serviceability. Can be planned. Furthermore, since the electrical box 2 and the cover member 3 can be grounded without using a gasket, cost reduction can be realized.

FIG. 5 shows a cross-sectional view of the claw-shaped fixing member 5 in a state where the cover member 3 is attached to the electrical equipment box 2.
The length of the hook portion 6 of the claw-shaped fixing member 5 can be appropriately set. For example, the length of the hook portion 6 of one claw-shaped fixing member 5 is set to the length of the hook portion 6 of the other claw-shaped fixing member 5. Can be longer.
The fixing position of the cover member 3 can be determined to some extent by first fixing the one claw-shaped fixing member 5 having a longer hook 6 and then the other claw-shaped fixing members 5 are fixed. As a result, the assembling property is improved.

FIG. 6 is a cross-sectional view of the claw-shaped fixing member 5 in a state where the cover member 3 is attached to the electrical box 2 as another embodiment.
In this embodiment, as shown in FIG. 6, the shape of the side cross section of the surface 7 that holds the frame portion of the opening surface of the electrical equipment box 2 of the claw-shaped fixing member 5 has an inclination that becomes narrower from the tip to the base. Yes.
As described above, since the gap becomes smaller toward the base of the hook portion, when the cover member 3 is slid and installed, the cover member 3 is fixed while applying a force for pressing the electric device box 2. Therefore, the grounding property can be improved without depending on the fixing by the screw member.

FIG. 7 shows a cross-sectional view of the claw-shaped fixing member 5 in a state where the cover member 3 is attached to the electrical box 2 as still another embodiment.
In the embodiment of the present invention, as shown in FIG. 7, the claw-like fixing member 5 has an elastic leaf spring shape 8, and the leaf spring shape 8 sandwiches the frame portion of the opening surface of the electrical box 2. Energize in the direction.
By adopting the leaf spring shape 8, when the cover member 3 is slid and installed, the cover member 3 can be fixed while applying a force for pressing the cover member 3 against the electrical box 2 more strongly than the mode shown in FIG. The grounding property can be improved without depending on the fixing by the screw member.

Next, the image forming apparatus according to the present invention will be described.
FIG. 8 shows a configuration of a tandem type color copying machine as one embodiment of the image forming apparatus according to the present invention.
An image forming apparatus (color copying machine) 200 according to the present invention includes an image forming unit 200A positioned at the center of the apparatus main body, a paper feeding unit 200B positioned below the image forming unit 200A, and an upper side of the image forming unit 200A. It is a high-speed machine having an image reading unit (not shown) located, and an electrical box 2 having a cover member 3 of the electrical box of the present invention (not shown) is incorporated in the image forming unit 200A.

  The image forming unit 200A is provided with a fixing belt 202 having a transfer surface extending in the horizontal direction, and a configuration for forming an image of a color complementary to the color separation color on the upper surface of the fixing belt 202. Is provided. That is, photoconductors 203Y, 203M, 203C, and 203K as image carriers that can carry images of toners of complementary colors (yellow, magenta, cyan, and black) are juxtaposed along the transfer surface of the fixing belt 202. ing.

  Each of the photoconductors 203Y, 203M, 203C, and 203K is configured by a drum that can rotate in the same direction (counterclockwise direction). An apparatus, a primary transfer device, a developing device, and a cleaning device are arranged. In addition, each color toner is accommodated in each developing device.

  The transfer belt 202 is configured to be able to move in the same direction at the position facing the photoconductors 203Y, 203M, 203C, and 203K by being wound around a driving roller and a driven roller. A transfer roller 211 is provided at a position facing a roller 210 that is one of the driven rollers. Further, the conveyance path of the sheet P from the transfer roller 211 to the transfer device 100 is a horizontal path.

  The paper feeding unit 200B separates the paper feeding tray 215 that stacks and stores sheets P as recording media and the sheets in the paper feeding tray 215 one by one in order from the top, and conveys them to the position of the transfer roller 211. A transport mechanism is provided.

  In image formation in the image forming apparatus 200 of the present invention, the surface of the photoreceptor 203Y is uniformly charged by the charging device, and an electrostatic latent image is formed on the photoreceptor 203Y based on image information from the image reading unit. The The electrostatic latent image is visualized as a toner image by a developing device containing yellow toner, and the toner image is primarily transferred onto the transfer belt 202 by a primary transfer device to which a predetermined bias is applied. . The other photoconductors 203M, 203C, and 203K also form similar images only with different toner colors, and the toner images of the respective colors are sequentially transferred and superimposed on the fixing belt 202 by electrostatic force.

  Next, the toner image primarily transferred from the photoconductors 203Y, 203M, 203C, and 203K onto the fixing belt 202 is transferred to the sheet conveyed by the roller 210 and the transfer roller 211. The sheet onto which the toner image has been transferred is further conveyed to the fixing device 100, where fixing is performed at the nip portion between the fixing belt and the pressure roller.

  Next, the sheet discharged from the nip portion is sent out along the discharge path. At this time, the sheet that has been wound around the fixing belt is separated from the fixing belt at the tip of the fixing separation claw and returned to the discharge path.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Electrical box 3 Cover member 4 Screw hole 5 Claw-shaped fixing member 6 Hook part

JP 2004-249633 A Japanese Patent Laid-Open No. 11-26974 JP 2004-63593 A

Claims (5)

In the cover member covering the outer surface of the electrical box that houses the electrical components,
The cover member is made of metal, the planar shape is a polygonal shape,
A hook-shaped claw-shaped fixing member that can be hooked to the frame of the electrical equipment box opening surface near each corner of the polygon and at the center of the edge excluding any one of the edges. A screw hole that can be fixed by a screw member is formed in the center of the end side that is formed and does not have the claw-shaped fixing means,
A cover member for an electrical box, wherein the cover member is fixed to a frame portion of the opening surface of the electrical box at least by the claw-shaped fixing means.   2. The cover member for an electrical box according to claim 1, wherein a shape of a side cross section of a surface of the claw-shaped fixing member that holds a frame portion of the opening surface of the electrical box has a slope that narrows from a tip to a base. .   2. The cover member for an electrical box according to claim 1, wherein the claw-like fixing member has a leaf spring shape having elasticity, and is biased in a direction sandwiching a frame portion of the opening surface of the electrical box.   The cover member for an electrical box according to claim 1, wherein, of the plurality of claw-shaped fixing members, a hooking portion of one claw-shaped fixing member is longer than another claw-shaped fixing member.   An image forming apparatus comprising: an electrical box having a cover member for the electrical box according to claim 1.

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