JP6278225B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

In general, an image forming apparatus using an electrophotographic system has a plurality of processing units for performing image forming processing on paper. Examples of the processing unit include a photosensitive drum unit on which a toner image is formed, and a developing unit that supplies toner to the photosensitive drum to form a toner image on the photosensitive drum. The image forming apparatus has a high voltage substrate for supplying a high voltage to these processing units. A partition wall is disposed between the processing unit and the high voltage substrate. The processing unit and the high voltage substrate are connected to each other by an electric wire member made of a metal wire penetrating the partition wall.

There are various layouts of the above-mentioned electric wire members. For example, the electric wire member shown in Patent Document 1 extends straight from the connection terminal portion of the high-voltage board toward the inside of the image forming apparatus, and then has a through hole formed in the partition wall. Connected to the processing unit.

However, in recent years, along with the downsizing of the image forming apparatus, there is a case where the electric wire member cannot be arranged straight while the space in the image forming apparatus is narrowed. For example, the electric wire member shown in Patent Document 2 is bent from the horizontal direction to the vertical direction on the processing unit side with respect to the sheet metal frame. In this case, since the electric wire member cannot be inserted straight into the through hole of the sheet metal frame, there is a problem that the assembling property of the electric wire member is poor. To solve this problem,
Patent Document 2 discloses a configuration in which an electric wire member is divided into a unit side wire material inside the sheet metal frame and a substrate side wire material outside the sheet metal frame, and the unit side wire material and the substrate side wire material are assembled separately. Has been.

JP 2006-145773 A JP 2012-18394 A

However, in the configuration shown in Patent Document 2, since it is necessary to divide the electric wire member into a unit side wire and a board side wire, an increase in the number of parts is caused, and an increase in assembly man-hours and an increase in cost are caused. There is a problem.

The present invention has been made in view of the above points, and the object of the present invention is to devise the configuration of the electric wire member that connects the processing unit and the high-voltage substrate without incurring an increase in cost. An object of the present invention is to efficiently arrange electric wire members in a narrow space and to facilitate the assembling work.

An electric wire member according to the present invention includes a processing unit for performing an image forming process on paper, a high voltage substrate for supplying a high voltage to the processing unit, and between the processing unit and the high voltage substrate. An electric wire member made of spring steel as a constituent material, which electrically connects the processing unit and the high-voltage substrate through a through-hole in a partition wall disposed in the processing unit, and the electric wire member penetrates and the processing unit And a wire holding frame including a partition wall disposed between the high-voltage board and a shape in which a part in the circumferential direction of the cylinder is missing on the surface of the partition wall on the high-voltage board side A holder portion for holding the electric wire member, and a guide wall bent corresponding to the shape of the electric wire member, and the treatment unit side surface of the partition wall has the treatment Projecting to the unit side The electric wire member includes a unit-side bent portion positioned on the processing unit side with respect to the partition wall, and a substrate-side bent portion positioned on the high voltage substrate side with respect to the partition wall. a through straight portion for connecting the substrate-side bent portion through the through hole and the unit-side bent portion, of which is not connected to the through straight portions of the two ends of the serial unit side bent portion A unit-side connecting portion connected to an end, a substrate-side straight portion comprising at least one straight portion connected to the high-voltage substrate side of the substrate-side bent portion, and the high-voltage substrate of the substrate-side straight portion A coil-like board-side connecting part that is connected to the side and inserted into the holder part, and the unit-side connecting part is positioned by the boss part, and the unit-side bent part and the board-side bent part Part, the straight through part, and Each one linear portion of the substrate-side straight portion is located in the same plane along the insertion direction of the through straight portion to the through hole, the unit-side bent portion and the substrate-side bent portion, the It is configured to be bendable in the same plane.

According to this configuration, since the electric wire member is bent at the unit-side bent portion and the substrate-side bent portion, the electric wire member can be efficiently used in a narrow space without interfering with peripheral devices of the processing unit and the high-voltage board. Can be arranged. The worker can easily perform the assembly work by elastically deforming the electric wire member. Moreover, compared with the case where an electric wire member is divided | segmented into plurality, the number of parts and an assembly man-hour can be reduced and cost reduction can be achieved.

According to the present invention, it is possible to efficiently arrange the electric wire member in a narrow space and facilitate the assembling work without causing an increase in cost.

FIG. 1 is a schematic longitudinal sectional view showing an image forming apparatus including an electric wire member in the embodiment. FIG. 2 is a perspective view showing a rear frame portion of the image forming apparatus. FIG. 3 is an enlarged perspective view showing a part of the electric wire holding frame holding the electric wire member (wire material) in an enlarged manner. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a perspective view showing a wire member in the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

<Embodiment>
FIG. 1 is a schematic configuration diagram of an image forming apparatus 1 including an electric wire member 60 according to the present embodiment. The image forming apparatus 1 is a tandem type color printer, and includes an image forming unit 3 in a box-shaped casing 2. The image forming unit 3 is a section that transfers and forms an image on the recording paper P based on image data transmitted from an external device such as a computer connected to a network. An exposure device 4 for irradiating laser light is disposed below the image forming unit 3, and a transfer belt 5 is disposed above the image forming unit 3. Below the exposure device 4, a paper storage unit 6 that stores the recording paper P is disposed, and a manual paper supply unit 7 is disposed on the side of the paper storage unit 6. A fixing unit 8 that performs a fixing process on the image transferred and formed on the recording paper P is disposed on the upper side of the transfer belt 5. Reference numeral 9 denotes a paper discharge unit that is disposed on the casing 2 and discharges the recording paper P that has been subjected to fixing processing by the fixing unit 8.

The image forming unit 3 includes four photosensitive drum units 10 arranged in a line along the transfer belt 5. Each photoconductor drum unit 10 has a photoconductor drum 11. A charger 12 is disposed immediately below each photoconductive drum 11, a developing unit 13 is disposed on one side of each photoconductive drum 11, and a primary transfer roller is directly above each photoconductive drum 11. 14
A cleaning unit (hereinafter referred to as a cleaning device) 15 for cleaning the peripheral surface of the photosensitive drum 11 is disposed on the other side of each photosensitive drum 11.

Each photosensitive drum 11 is uniformly charged at its peripheral surface by the charger 12, and each color based on image data input from the computer or the like is applied to the peripheral surface of the photosensitive drum 11 after charging. Corresponding laser light is irradiated from the exposure device 4, and an electrostatic latent image is formed on the peripheral surface of each photosensitive drum 11. Developer is supplied to the electrostatic latent image from the developing unit 13, and a yellow, magenta, cyan, or black toner image is formed on the peripheral surface of each photosensitive drum 11. These toner images are respectively transferred to the transfer belt 5 by a transfer bias applied to the primary transfer roller 14.

Reference numeral 16 denotes a secondary transfer roller disposed below the fixing unit 8 in contact with the transfer belt 5. The recording sheet P is transported through the paper transport path 17 from the paper storage unit 6 or the manual paper feed unit 7. 2
The toner image on the transfer belt 5 is transferred onto the recording paper P by the transfer bias applied between the secondary transfer roller 16 and the secondary transfer roller 16.

The fixing unit 8 includes a heating roller 18 and a pressure roller 19, and these heating rollers 18.
And the pressure roller 19, the recording paper P is sandwiched and heated and pressed to fix the toner image transferred to the recording paper P to the recording paper P. The recording paper P after the fixing process is discharged to the paper discharge unit 9. Reference numeral 20 denotes a reversing conveyance path for reversing the recording paper P discharged from the fixing unit 8 during double-sided printing.

FIG. 2 is a perspective view of the image forming apparatus 1 as viewed from the rear. The rear side of the image forming apparatus 1 is usually covered with a sheet metal cover, but FIG. 2 shows a state in which the sheet metal cover is removed. Reference numeral 30 in the drawing is a sheet metal frame attached above the rear part of the casing 2. A resin wire holding frame 31 is attached to the lower end of the sheet metal frame 30,
A high voltage substrate 50 is mounted on the rear side of the wire holding frame 31. This high voltage substrate 5
Reference numeral 0 denotes a substrate for supplying a high voltage to various processing units 100 for performing image forming processing on paper. The high voltage substrate 50 has a mounting surface on which various elements for power supply such as a high voltage semiconductor element and a transformer are mounted. The high voltage substrate 50 is disposed so that the mounting surface faces the base plate 32 of the wire holding frame 31.

The electric wire holding frame 31 holds a plurality of (three in this embodiment) electric wire members 60 that electrically connect the above-described various processing units 100 and the high voltage substrate 50. Each electric wire member 60 is formed by plastically deforming a metal wire. Examples of the processing unit 100 include a photosensitive drum unit 10, a developing unit 13, an intermediate transfer unit, and the like.

The electric wire holding frame 31 has a base plate 32. The base plate 32 is disposed so as to cover the rear side of the four photosensitive drum units 10. The base plate 32 constitutes a partition plate disposed between the processing unit 100 and the high voltage substrate 50. The base plate 32 includes an upper vertical plate portion 32a, a lower vertical plate portion 32b, and a horizontal plate portion 32c that couples the vertical plate portions 32a and 32b (see FIG. 4). High voltage substrate 50 in base plate 32
A total of four wire holding areas 33 corresponding to the four photosensitive drum units 10 are provided on the side surface.
(See FIG. 2). Each wire holding area 33 holds a plurality of wire members 60 connected to various processing units 100 such as the developing unit 13 and the intermediate transfer unit as well as the photosensitive drum unit 10. Since the configuration of each wire holding area 33 is the same, only the wire holding area 33 positioned on the rightmost side of the image forming apparatus 1 will be described below.

As shown in FIG. 3, a plurality of guide walls 35 are erected in the wire holding area 33. The guide wall 35 guides the electric wire member 60 connected to the processing unit 100. The electric wire member 60 is disposed along the guide wall 35. The guide wall 35 is bent corresponding to the shape of the electric wire member 60. A through hole 36 is formed in a portion of the base plate 32 that is slightly above the upper end of each guide wall 35. The wire member 60 passes through the through hole 36. A holder portion 40 and a boss portion 41 (see FIG. 4) project from a portion slightly below the lower end portion of the guide wall 35 in the wire holding region 33 of the base plate 32. The holder part 40 has a shape in which a part in the circumferential direction of the cylinder is missing. The boss portion 41 is formed in a cylindrical shape coaxial with the holder portion 40. The boss portion 41 supports the input side connection portion 61 of the electric wire member 60 by being externally inserted. The holder portion 40 is formed so as to surround the outer periphery of the input side connection portion 61 that is extrapolated to the boss portion 41.

As shown in FIG. 4, a cylindrical boss portion 42 projects from the surface of the base plate 32 on the processing unit 100 side. The boss portion 42 is formed below the through hole 36. The output side connection part 62 of the electric wire member 60 is extrapolated and supported by the boss part 42.

Each of the wire members 60 is composed of one wire made of spring steel. Each wire member 60 is bent at a predetermined location in order to avoid interference with other components. Each wire member 60 has the same basic configuration except that the bending angle is slightly different. For this reason, below, only the electric wire member 60 located in the leftmost side of FIG. 3 is demonstrated.

As shown in FIG. 5, the electric wire member 60 includes an input side connecting portion 61, an output side connecting portion 62,
It has the connection line part 63 which connects this input side connection part 61 and the output side connection part 62 with each other.
The input side connection part 61 and the output side connection part 62 of the said electric wire member 60 are formed in the coil shape (it is also called a spiral hook) of multiple turns. The input side connecting portion 61 is sandwiched between the high voltage substrate 50 and the base plate 32 of the electric wire holding frame 31 in a state where the high voltage substrate 50 is mounted on the electric wire holding frame 31 and is compressed and deformed. Thereby, the contact pressure between the input side connecting portion 61 and the high voltage substrate 50 can be sufficiently secured. The output side connection portion 62 is sandwiched between the high voltage substrate 50 and the connection terminal portion of the processing unit 100 in a state where the high voltage substrate 50 is mounted on the wire holding frame 31 and is compressed and deformed. Thereby, the contact pressure between the output side connecting portion 62 and the connection terminal of the processing unit 100 can be sufficiently secured.

The connecting line portion 63 includes first to fifth straight portions 65a to 65e and these five straight portions 65.
1st-4th bending part 64a-64d located in the boundary part of a-65e. The connecting portion 63 extends upward from one end of the output side connecting portion 62 along the tangential direction thereof, and then bends at a substantially right angle at the first bent portion 64a, from the processing unit 100 side toward the high voltage substrate 50 side. The second bent portion 64b is bent at a substantially right angle and then extended downward, then bent at the third bent portion 64c and extended obliquely downward, and finally the fourth bent portion. It bends downward at 64d and is connected to the input side connecting portion 61 from its tangential direction. The first straight portion 65a and the first bent portion 64a are located closer to the processing unit 100 than the base plate 32 (see FIG. 4). The second straight portion 65 b passes through the through hole 36 of the base plate 32. 3rd-5th linear part 65c-65e
The second to fourth bent portions 64 b to 64 d are located on the high voltage substrate 50 side by the base plate 32. And the 2nd bending part 64b connected to the edge part of the high voltage board | substrate 50 of the 2nd linear part 65b which penetrates the through-hole 36 is made into the coil type bending part which has a coil | winding coil shape.

When the electric wire member 60 is assembled to the image forming apparatus 1, first, the output side connection portion 62 of the electric wire member 60 is inserted from the through hole 36 of the base plate 32 to the processing unit 100 side of the base plate 32. Then, the output side connecting portion 62 is tilted so that the tip end side becomes higher while applying a force on the bending release side (arrow side in FIG. 4) to the second bending portion 64b which is a coil-type bending portion. Then, the position of the base end portion of the output side connection portion 62 is matched with the position of the tip end portion of the boss portion 42. Then, after this positioning is completed, by gradually weakening the force to the second bent portion 64b, the elastic deformation of the electric wire member 60 is released and the axis of the output side connecting portion 62 becomes horizontal. Get closer. Along with this. The output side connecting part 62 is extrapolated to the boss part 42. Then, after the output side connection portion 62 is extrapolated to the boss portion 42, the entire connecting line portion 63 is arranged along the guide wall 35, and finally, the input side connection portion 6.
By assembling 1 to the boss 41, the assembly work of the electric wire member 60 is completed.

As described above, in the above-described embodiment, the first bent portion 64a (corresponding to the unit-side bent portion) located on the processing unit 100 side with respect to the base plate 32 and the high voltage substrate 50 side with respect to the base plate 32 are provided. Second to fourth bent portions 64b to 64d (corresponding to substrate-side bent portions).

According to this configuration, the electric wire member 60 can be efficiently arranged in a narrow space without interfering with the processing unit 100 and peripheral devices of the high voltage substrate 50.

Moreover, in the said embodiment, the 2nd bending part 64b is made into the coil-type bending part which has a coil | winding coil shape among the 2nd-4th bending parts 64b-64d which are board | substrate side bending parts.

Therefore, when the electric wire member 60 is assembled, the electric wire member 60 can be elastically deformed by bending or extending the coil-type bent portion as a fulcrum. Therefore, the worker can easily perform the assembly work while elastically deforming the electric wire member 60. Moreover, compared with the case where the electric wire member 60 is divided into a plurality of parts, the number of parts and the number of assembling steps can be reduced and the cost can be reduced.

In the above embodiment, the second bent portion 64 b that is a coil-type bent portion is connected to the end of the high voltage substrate 50 of the second straight portion 65 b that penetrates the through hole 36.

According to this configuration, the coiled bent portion can be as close as possible to the through hole 36. Therefore, the electric wire member 60 can be elastically deformed in the vicinity of the through hole 36 while being inserted into the through hole 36. Therefore, the assembly work of the electric wire member 60 can be further facilitated.

Moreover, in the said embodiment, the boss | hub part 42 which protrudes in the processing unit 100 side is formed in the surface at the side of the processing unit 100 in the base board 32, and the output side connection part 62 (processing unit 100 side) of the electric wire member 60 is formed. Is formed in a coil shape of a plurality of windings, and is positioned by being extrapolated to the boss portion 42.

According to this configuration, when assembling the electric wire member 60, an operation of extrapolating the output side connection portion 62 to the boss portion 42 is required. For this reason, in the conventional electric wire member 60 which does not have a coil type bending part, there exists a problem that an assemblability is bad. On the other hand, in the above-described embodiment, as described above, the second bent portion 64b is a coil-type bent portion, and the electric wire member 60 is elastically deformed with the second bent portion 64b as a fulcrum. The 60 output side connection parts 62 can be easily extrapolated to the boss part 42.

Moreover, in the said embodiment, the electric wire member 60 is comprised with the spring steel. According to this configuration, the flexibility (elasticity) of the electric wire member 60 can be increased as much as possible. Therefore, the assembly work of the electric wire member 60 can be further facilitated.

<< Other embodiments >>
In the above-described embodiment, only the second bent portion 64b among the second to fourth bent portions 64b to 64d, which are the substrate-side bent portions, is a coil-type bent portion. All of the fourth bent portions 64b to 64d may be configured by a coil-type bent portion, and the first bent portion 64a that is a unit-side bent portion may be configured by a coil-type bent portion.

In the above-described embodiment, the number of turns of the coil-type bent portion (the second bent portion 64b in the above-described embodiment) is one, but is not limited to this, and may be two or more.

  As described above, the present invention is useful for an image forming apparatus including an electric wire member.

1 Image forming apparatus 10 Photosensitive drum unit (processing unit)
13 Development unit (processing unit)
31 Electric wire holding frame 32 Base plate (partition wall)
35 Guide wall 36 Through hole 40 Holder part 42 Boss part 50 High voltage board 60 Electric wire member 61 Input side connection part (unit side connection part)
62 Output side connection (board side connection)
64a 1st bending part (unit side bending part)
64b Second bent portion (substrate-side bent portion)
65b 2nd straight part (through straight part)
65c 3rd straight line part (straight line part, substrate side straight line part)
65d 4th straight line part (straight line part, substrate side straight line part)
65e 5th straight line part (straight line part, substrate side straight line part)
100 processing units

Claims (1)

A processing unit for performing image forming processing on paper;
A high voltage substrate for supplying a high voltage to the processing unit;
An electric wire member having spring steel as a constituent material, which connects the processing unit and the high voltage substrate through a through hole in a partition wall disposed between the processing unit and the high voltage substrate; ,
An electric wire holding frame including a partition wall disposed between the processing unit and the high voltage substrate while the electric wire member penetrates,
The surface on the high-voltage board side of the partition wall has a shape in which a part of the circumferential direction of a cylinder is missing, and corresponds to the shape of the holder part for holding the wire member and the shape of the wire member. A bent guide wall,
The surface on the processing unit side of the partition wall is provided with a boss portion projecting to the processing unit side,
The wire member is
A unit side bend located on the processing unit side of the partition wall; and
A substrate side bend located on the high voltage substrate side of the partition wall; and
A penetrating straight line portion that passes through the through hole and connects the substrate side bent portion and the unit side bent portion;
And two of the through straight portion connected to an end of which is not connected to the unit side connection portion of the end portion of the unit side bent portion,
A substrate-side straight portion that is connected to the high-voltage substrate side of the substrate-side bent portion and includes at least one straight portion;
A coil-like board-side connecting part connected to the high-voltage board side of the board-side straight part and inserted into the holder part;
Have
The unit side connection part is positioned by the boss part,
One straight portion of the unit side bent portion, the substrate side bent portion, the through straight portion, and the substrate side straight portion is located in the same plane along the insertion direction of the through straight portion with respect to the through hole. And
The image forming apparatus, wherein each of the unit-side bent portion and the substrate-side bent portion is configured to be bendable in the same plane.

Images