JP2952055B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus in which a power supply unit frame and a circuit board unit frame are grounded.

[0002]

2. Description of the Related Art Recently, in a facsimile apparatus, a body frame and an exterior are integrally formed by molding to reduce the weight and size of the apparatus body and automate assembly, and various parts and units are automatically mounted on the body frame from above. It was assembled so that it could be dropped.

For this reason, the power supply unit and the circuit board unit are separated by the main body frame. In this case, the electrical connection between the power supply unit and the circuit board unit is made through a hole formed in the main body frame. . The ground connection between the power supply unit frame and the circuit board unit has also been made through the hole of the main body frame.

Here, a case where a control circuit board is used as a circuit board unit will be described with reference to FIG.

A power supply unit 31 for converting a commercial power supply to a low voltage of ± 24 V, ± 5 V or the like is disposed so as to be dropped into a storage portion at an end of the apparatus main body. Natural air cooling was used without using a fan for forced cooling. Power supply substrate 31 ₁ in this order power Yunitsuto is the cooling efficiency on the vertical type, and is disposed along from the relationship of the arrangement of the other mechanisms in the side wall of the apparatus main body,
From now on, the position of the power supply unit 31 was naturally determined.

In such a facsimile apparatus, in order to facilitate maintenance, the control circuit board 32 is disposed at the bottom of the apparatus main body so as to be isolated from various components and units by a main body frame 33. For this reason,
Repair of the control circuit board 32 can be performed only by opening the bottom cover 34.

Therefore, the electrical connection between the control circuit board 32 and the power supply unit 31 has been made through the hole 35 formed in the body frame 33.

The output section of the power supply unit 31 is a power supply board 3
Power connector 36 is attached to a _first output circuit, control connector 34a is attached to the control circuit board 32. Then the power supply Yunitsuto 31 and a control circuit board 32 to electrically connect when assembling, when On drop power Yunitsuto 31 in the housing portion of the end portion of the apparatus main body, the power supply connector 36 of the power supply substrate 31 ₁ Connection code 37 in advance
After the first connector 37a at one end of the power supply unit 31 is connected, the second connector 37b at the other end of the connection cord 37 is inserted into the hole 35 from the housing portion side of the power supply unit 31, and then the power supply unit 31 is connected to the end of the apparatus body. It was dropped into the storage section in the section and assembled. Then, the second connector 37b of the connection cord 37 is connected to the control connector 36 of the control circuit board 32.

[0009] To match the ground voltage between the power supply Yunitsuto 31 as ESD protection and lightning protection and the control circuit board 32, power supply Units - frame ₃₁₂ and the control circuit ground wire bottom cover 34 as a holding member of the substrate 38 And knotted each with a screw.

Therefore, the ground wire 38 is also connected to the main body frame 3.
3 through the holes 35 is intended to perform the ground connection between the bottom cover 34 as a holding member of the power Units - frame ₃₁₂ and the control circuit board 32, one end of the ground wire 38 during assembly to the power supply Units - frame 31 ₂ The power supply unit 31 was previously connected, the other end of the ground wire 38 was inserted into the hole 35 from the housing portion side, and then the power supply unit 31 was dropped into the housing portion at the end of the apparatus body to perform assembly.

[0011]

The work of inserting the connection cord 37 and the ground wire 38 into the hole 35 is difficult with an automatic machine and has to be performed manually. Therefore, when assembling the power supply unit 31 while automatically assembling each unit by the dropping method, the automatic assembling is temporarily stopped.
The automatic assembly is performed again after the manual operation, so that not only the number of steps is increased but also the labor is required, but also the assembly process becomes very inefficient and causes a cost increase.

In addition, since the conventional apparatus has a structure using a mold frame, the noise shielding effect is poor, and an expensive conductive coating is required for the main body frame. In addition, since the conductive coating is connected to the power supply frame by grounding, a grounding cable is required, and the structure is not effective and the assembly is difficult.

An object of the present invention is to solve the above-mentioned drawbacks and to make it easy to take measures against noise.

[0014]

According to the present invention, a circuit board unit and a power supply unit are provided on a main body of a device so as to be separated from each other by a main body frame. In a facsimile apparatus for grounding the circuit board unit frame to the power supply unit frame through the provided hole, projecting pieces are provided on the circuit board unit frame and the power supply unit frame, respectively, and these projecting pieces are connected to the hole section. And a first shield plate is provided on the circuit board unit, and a second shield plate is provided between the power supply unit and the CCD circuit board. It is connected to the power supply unit frame.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the entire apparatus. In FIG. 1, reference numeral 1 denotes an original, and reference numeral 2 denotes an original transport unit, which forms a unit at the time of assembly as indicated by a dotted line in the lower part. Reference numeral 3 denotes an optical reading unit, which forms a unit at the time of assembly as indicated by a dotted line in the figure. Reference numeral 4 denotes a thermosensitive recording paper, reference numeral 5 denotes a printing unit, and reference numeral 6 denotes a recording paper cut unit, which forms a unit at the time of assembly as indicated by the dotted line in the figure. 7 is a paper discharge stack unit, 8 is a recording paper curl removing unit, 9
Reference numeral denotes an operation panel unit which forms a unit for assembling as shown by a dotted line in the drawing together with the upper portion of the document conveying unit 2. 10 is a main body frame, 11 is a bottom cover, 12 is an upper cover, 13
Numeral denotes a recording cover, which forms a unit at the time of assembling together with the printing section 5 as shown by a dotted line in the figure. Reference numeral 14 denotes a control circuit board, which is separated from other units and electronic components by the main body frame 10, and is disposed at the bottom of the apparatus main body. The control circuit board 14 can be repaired by opening the bottom cover as shown in FIG. That is, the control circuit board 1
Numeral 4 is held by the bottom cover 11 to form a circuit board unit. Reference numeral 15 denotes a power supply unit (internal parts are omitted), 16a and 16b are connection cords, 17 is a hole formed in the main body frame, and 18 is a paper discharge tray.

Here, the configuration of the power supply unit 15 and the electrical connection between the power supply unit 15 and the control circuit board 14 will be described.

[0018] The power Yunitsuto 15 and the power supply substrate 15 ₁ in which various components are provided is disposed vertically, the substrate 1
5 and ₁ supporting substrate vertically from 15 ₂ is implanted, the first connector 19a to the tip of the supporting substrate 15 _2, 19b is attached. Substrate 15 ₁ and 15 ₂ are connectors 21a,
21b are electrically connected. The first connector 19a, 19b is being connected to the output circuit of the power supply board 15 ₁ through the supporting substrate 15 _{and second} wiring patterns, a first connector 19a, 19b is disposed at a position opposed to the hole 17 You. 15 ₃ has a configuration which also serves as a Shiyashi the heat radiation fins in the frame of the power Yunitsuto. One end of each of the connection cords 16a and 16b is connected to the input circuit of the control circuit board 14, and the other end of each of the second connectors 20a and 20b is connected to the other end.
b is connected. The second connectors 20a and 20b are connected through the holes 17 to the first connector 1 of the power supply unit.
9a and 19b.

[0019] Next, the relationship between the frame 15 ₃ of the bottom cover 11 and the power Yunitsuto 15 3, will be described with reference to FIG.

Both ends of the hole 17 form a gap for holding the bent protruding pieces 11a and 11b of the bottom cover 11. When the bottom cover 11 is opened, the contact is cut off as shown in FIG. Electrically conductive than being secured through a lower cover 10a by this way at the time of closing of the bottom cover 11 are laminated and bent portion 15 ₄ of the bent portion 11c and the power supply frame 15 provided in the bottom cover 11 screw 10b And the frame 15 _{3 of the} bottom cover 11 and the power supply unit 15
Is connected to ground. Note that the main body frame 1
0 and the lower cover 10a may be integrally formed.

Here, the document feeding system will be described.

On the upper surface of the recording cover 13, the stacked originals 1 were separated one by one by a preliminary transport roller 2c pressed against the separation pressing piece 2a and a separation roller 2d pressed against the separating friction piece 2b, and further pressed against the pressing roller 2e. Paper feed roller 2g,
The paper is conveyed by a paper discharge roller 2h pressed against the pressing roller 2f, and is stacked on the paper discharge tray 18.

Next, the document reading system will be described.

Further, the lower surface of the conveyed document 1 is illuminated by a light source 3b, for example, an LED array through a document glass 3a.
The reflected light is transmitted by mirrors 3c, 3d, and 3e via a lens 3f to a photoelectric conversion element 3g such as a CCD.
The image is recorded by its own recording unit 5 in the copy mode, and is transmitted to the recording unit of another machine in the facsimile mode (transmission mode).

The recording system will be described.

The heat-sensitive recording paper 4 is stored in a roll receiving portion of the frame 10 by roll paper. 4a indicates a roll full state, and 4b indicates a roll empty state. After the curl is removed by the curl removing unit 8, the roll paper 4 is conveyed in the paper discharge direction by a platen roller 5a driven by a motor (not shown). At this time, the recording paper 4 is heated by a heat-sensitive head (thermal head) 5b pressed against the platen roller 5a.
Is printed every dot. The printed recording paper has a fixed blade 6 at the cutter part as shown by a two-dot chain line.
a, and passes from the top to the reversing tray portion composed of the inner tray 7a and the outer tray 7b after passing between the rotating blade 6a and the rotary moving blade 6b. The recording paper fed by the platen roller is ejected in a loop to the outside of the apparatus, with the leading end of the recording paper being fed to the reversing tray, and the moving blade 6 b
Is cut by being rotated upward in the figure, and the rear end is discharged to the outside of the apparatus while holding the front end.

The curl removing unit 8 has a moving guide shaft 8a, a fixed shaft 8b (constituted on the recording cover 13 side, and a rotating shaft 8c for the guide shaft. The moving guide shaft 8a is for the roll paper 4. Depending on the remaining winding diameter, the roll paper is wound around the fixed shaft 8b by a mechanism (not shown) when the roll paper is as thin as the core diameter at the position 8a in the figure and when the roll paper is full, at the position 8d in the figure. Vary the amount.

The degree of curl removal is changed by the difference in the amount of winding, so that a constant flatness is always given to the discharge roll paper.

Reference numeral 9 denotes an operation panel unit, and 9a denotes an LCD.
And the like, 9b is an operation panel control board OPCNT (operation control board), 9c is a key top, 9
d is a tact switch on OPCNT.

Here, the first and second shield plates will be described with reference to FIGS.

A first shield plate 24 is provided above the control circuit board 14 and is fixed below the main body frame 10, and is fixed with screws 24a. 3h is a CCD circuit board. 15 ₅ is the bent portion of the frame 15 _third power supply Yunitsuto 15. Reference numeral 23 denotes a fixing plate also serving as a connection ground. The fixing plate is fixed to the body frame 10 with screws 23a. Reference numeral 25 denotes a CCD circuit board 3h and a power supply unit 15.
A second shield that shields between the two. The first shield plate 24 is fixed to the fixed plate 23 with screws 24b.
The second shield plate 25 is fixed to the fixed plate 23 with screws 25a. Bend 15 ₅ Power Units - frame 15 ₃ is fixed to the fixing plate 23 by screws 15 _6. Where 26 is CC
It is a hole for a connection cable from the D circuit board 3h to the circuit board 14.

With the above configuration, the first shield plate 24 is fixed to the main body frame 10, and the fixing plate 23, the second shield plate 25, and the power supply unit 15 are later dropped down from above to easily assemble. It is possible to make.

Next, a case where the facsimile apparatus constructed as described above is assembled will be described.

The main body frame 10 integrally formed by injection molding is mounted on an automatic assembling machine, and each unit is dropped and assembled by the automatic assembling machine. At this time, the hole 17 is formed, and voids at both ends of the hole 17 are also formed. That is, first, a unit having the recording paper cut section 6 is assembled and mounted. Next, a unit having the optical system reading unit 3 is assembled and attached. Then, the power supply unit 15 is assembled and attached to the storage section of the main body frame 10. First connector 19 connected Then through the power substrate 15 ₁ of the output circuit to the supporting substrate 15 _{and second} wiring patterns
a and 19b are arranged at opposing positions of the main body frame 10. Therefore, the second connectors 20a and 20b of the first connectors 19a and 19b are
Can be easily combined.

Further, a unit provided with the recording cover 13 and the printing section 5 is mounted on the main body frame 10 and attached.

Further, a unit provided with a lower portion of the document conveying section 2 is mounted on the main body frame 10 and attached.

Finally, a unit provided with an upper side of the original conveying section 2 and an operation panel section 9 is incorporated into a main body frame 10 and attached.

This completes the automatic assembly by dropping each unit, but thereafter, the other parts are assembled on the main body frame 10. During the assembly of other components, the bottom cover 11 having the control circuit board 14 is attached. At this time,
The bent projecting pieces 11a and 11b of the bottom cover 11 are inserted into gaps at both ends of the hole 17 so as to be clamped as shown in FIG. Then, the bottom cover 11 is attached to the apparatus main body, closed and fixed from below by screws, so that the ground connection can be easily made. The electrical connection between the control circuit board 14 and the power supply unit 15 is made by connecting the second connectors 20a, 20b of the connection cords 16a, 16b connected to the input circuit of the control circuit 14.
Of the power supply unit 1 through the hole 17 of the main body frame 10.
5 only need to be connected to the first connectors 19a and 19b.

In the above embodiment, the power supply unit 15
And the electrical connection between the control circuit board 14 and
The same can be applied to the case of making an electrical connection with another circuit board unit.

Further, in the above embodiment, the structure is described in which the power supply does not cover the control circuit board 14 when projected from above the apparatus main body. However, depending on the size of the apparatus,
The power supply position in FIG. 1 is raised, and is inserted into the lower part of the lower part of the power supply of the control circuit board, and comes below the power supply on the control circuit board.
A similar effect can be obtained by a method in which the control circuit board connector is inserted upward from below through a hole in the bottom cover or the frame.

[0041]

As described above in detail, according to the present invention, the circuit board unit and the power supply unit are provided in the apparatus main body so as to be separated by the main body frame, and the hole formed in the main body frame is provided. In a facsimile apparatus in which the circuit board unit frame is grounded to the power supply unit frame via a through hole, projecting pieces are provided on the circuit board unit frame and the power supply unit frame, and the projecting pieces are connected to each other through the hole. Providing a first shield plate on the circuit board unit, providing a second shield plate between the power supply unit and the CCD circuit board, and connecting the first and second shield plates to the power supply unit frame. Therefore, when assembling the circuit board unit automatically, as in the past, the automatic assembly was temporarily stopped and manual work was performed. No inconvenience Nau, and can continue to automated assembly, it is possible to a very efficient assembly process, in which can reliably grounded by incorporation of the circuit board Yunitsuto. In addition, since the first and second shield plates are also configured to be easily incorporated, automatic assembly can be similarly performed, and a product having a high shielding effect can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a facsimile apparatus according to one embodiment of the present invention.

FIG. 2 is a view when a bottom cover of FIG. 1 is opened.

FIG. 3 is a perspective view of a main part of FIG. 1;

FIG. 4 is a cross-sectional view of a connection portion between the circuit board unit frame and the power supply unit frame of FIG. 1;

FIG. 5 is a perspective view of a coupling portion between a first shield plate and a second shield plate of FIG. 1;

FIG. 6 is a cross-sectional view of the coupling portion shown in FIG.

FIG. 7 is a configuration diagram of a conventional facsimile machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Document 2 Document conveyance part 3 Optical reading part 4 Thermal recording paper 5 Printing part 10 Main body frame 11 Bottom cover 11a, 11b Folding piece 14 Control circuit board 15 Power supply unit 15 ₁ Power supply board 15 ₂ Support substrate 15 ₃ Power supply unit frame 16a, 16b Connection coat 17 Hole 19a, 19b, 20a, 20b Connector

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Kenno 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 1/00

Claims (1)

(57) [Claims] A circuit board unit and a power supply unit are provided in a main body of the apparatus so as to be separated by a main body frame, and the circuit board unit frame is connected to the power supply unit frame through a hole formed in the main body frame. In the facsimile apparatus, the projecting pieces are respectively provided on the circuit board unit frame and the power supply unit frame, and these projecting pieces are connected to each other through the holes, and a first shield plate is provided on the circuit board unit. A facsimile apparatus, wherein a second shield plate is provided between the power supply unit and the CCD circuit board, and the first and second shield plates are connected to the power supply unit frame.