JP3375032B2 - Frame structure of electronic equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a frame structure of a casing of various electronic equipments, electric equipments, and mechanical devices, and particularly, assembling while maintaining high rigidity of the frame not only in the assembling process but also after assembling. The present invention relates to a structure of a frame of an electronic device or the like that can improve the property and can solve various derived defects.

[0002]

2. Description of the Related Art A casing of electronic / electrical equipment such as various office automation equipment and communication equipment, and a casing of a mechanical device is a frame structure made of various frame materials such as sheet metal, and It is composed of side plates, top plates, and other plate materials to be assembled, and exterior materials thereof.

[0003]

Generally, in a device such as a copying machine in which an image reading unit (scanner unit) is arranged on a printer unit (image forming unit), the image reading unit is not provided. The frame structure is required to have high rigidity in order to prevent image distortion and malfunction, but in the image reading unit used in the copying machine, the strength of the image reading unit is the frame of the printer unit which is the lower structure. It can depend to some extent on the strength of the structure. However, since the image scanner, which is a single machine, does not have a printer section, there is no object that depends on strength, and it is necessary to secure rigidity independently. By the way, a frame structure that is usually adopted in an image scanner (for example, a flat bed type) has a box shape in which a receiving member for mounting a contact glass is provided on the top surface. The carriage reciprocates in the sub-scanning direction, the optical path is formed over a wide range, and a work space is required because it is necessary to assemble wires and belts for driving the carriage together with the carriage and the like. Due to such circumstances, it is not possible to adopt an assembly method in which a highly rigid box-shaped frame structure is completed from the beginning of the assembly process and then parts such as a carriage, a wire, and a belt are assembled in the frame structure. Internal mechanical parts such as a carriage for a frame structure in which the reinforcing frame material has not been assembled yet and the strength is incomplete. Will be assembled, the stiffness tends to lack in this condition, also, such as the reinforcement in this process step is difficult. Therefore, all the reinforcing frame materials will be assembled at the final stage after the completion of the assembly of various internal mechanical parts to the frame structure with insufficient strength. Since errors occur in the positional accuracy of various parts supported by the structure, the accuracy of the scanner is reduced. In particular, it is complicated and difficult to move wires, belts, etc. into the frame structure over a long distance.
Since the adjustment work of the optical system is also performed in the initial stage of assembling, the accuracy obtained from the adjustment performed in the state of being assembled to the frame structure having a low rigidity is inevitably low. Therefore, a method of ensuring a sufficient frame strength from the beginning of the assembling process by incorporating a rectangular pipe in a part of the frame structure can be considered. Since the rectangular pipe has high rigidity, it has been conventionally used as a constituent material of a frame structure. Even in a stand-alone image scanner, a frame structure using a square pipe is adopted in recent competitors' machines (Fujitsu etc.) (see FIG. 11).

FIG. 10 is an exploded perspective view showing the structure of a frame structure having a monocoque structure used in a conventional single image scanner or the like. Square pipe members 3 and 4 are provided between a front side plate 1 and a rear side plate 2. By arranging them in a crossed state, strengthening the connection between each part and sharing the stress on the surface of the square pipe material, it is possible to realize a frame structure with light weight and high rigidity (particularly high torsional rigidity). Is. A frame structure formed by assembling the front and rear side plates 1 and 2 and the square pipe members 3 and 4 is used from the beginning of the assembling process, and internal mechanical parts such as a carriage are assembled into the structure, and finally the left and right side plates (contacts). By assembling 5 and 6 (having a glass receiving portion), a frame structure having high rigidity (hard to be distorted) can be used during the entire assembly process. Incidentally, the base member 7 located at the bottom needs to be thin in consideration of reduction of the overall weight, so that the contribution in rigidity is small (however, it effectively acts as a drag force against shearing on a flat plate). . However, the square pipe members 3 and 4 have a small degree of freedom in processing the end portions in the longitudinal direction, and generally have a flat end shape as shown in the drawing, which makes it difficult to fasten the side plates 1 and 2. Was occurring. For example, in the image scanner (manufactured by Fujitsu) shown in FIG. 11, a square pipe member 10 having flat end faces and a side plate 1 are provided.
Since the joint with 1 is connected by multi-point spot welding (indicated by X in the figure), the workability deteriorates during welding, heat distortion occurs, the cost increases, and the welded frame is processed. Considering the case of transportation from the
Since it is a big one, it has the disadvantage of poor transport efficiency. The present invention has been made in view of the drawbacks of the above-described conventional example, improves the assemblability while maintaining the high rigidity of the frame structure from the initial stage of assembly, and presents a solution to the resulting defect. To do. That is, when forming a high-strength frame structure by inserting a square pipe between the side plates, deterioration of workability during welding, occurrence of thermal strain,
For the purpose of providing a frame structure for electronic devices and the like, which can solve the problems of cost increase and the reduction of transportation efficiency when transporting a welded frame from a processing zone to an assembly zone. There is.

[0005]

In order to achieve the above object, the invention of claim 1 is a plate member having a U-shaped cross-sectional shape, and an opening edge portion of the U-shaped member. It is characterized in that it is provided with a square pipe material made of a flat plate-like reinforcing plate mechanically coupled to the above, and both axial ends of the square pipe material are fixed by screws with side plates. The invention of claim 2 is characterized in that a flat plate also serving as a slide rail is bonded to the reinforcing plate with an adhesive. According to a third aspect of the present invention, a drawn portion or a bar is formed on the surface of the reinforcing plate located between a plurality of connecting portions between the reinforcing plate and the opening edge of the U-shaped member.
A ring processing portion is provided to improve the strength of the reinforcing plate, or a protruding edge portion is provided at the opening edge of the U-shaped member to improve the bonding strength with the reinforcing plate. According to a fourth aspect of the present invention, a positioning protrusion is axially provided on the end of the U-shaped member in the axial direction, a positioning hole is formed in the side plate to receive the positioning protrusion, and the positioning protrusion is positioned. It is characterized in that the shapes of the positioning projections and the positioning holes are set so that the positioning in two directions can be performed in the process of inserting into the hole. The invention of claim 5 is characterized in that the axial end surface of the square pipe member and the side plate can be fastened at one location each.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is an exploded view showing a structure of a reinforcing square pipe material according to a first embodiment of the present invention. This example is a differential mirror used for a single image scanner.
This type of square pipe material doubles as a slide rail for a carriage (not shown).
The top surface is the slide surface of the carriage. The square pipe member 20 is a metal material having a U-shaped cross section, and is a U-shaped member 21 that also serves as a slide rail and a stay, and a reinforcing plate 22 that is a metal plate fixed to an opening edge 21 a of the U-shaped member 21. Composed of and. The U-shaped member 21 includes an upper piece 21A and two side pieces 21B, and the reinforcing plate 22 has a flat plate shape. The U-shaped member 21 and the reinforcing plate 22 are processed by press working, respectively, and the opening-side edge 21a of the U-shaped member 21 is
A projecting portion 23 having a V-shaped groove-like notch is provided at the lower end edge so as to project, and the projecting portion 23 is fitted in a corresponding fitting hole 24 provided in the reinforcing plate 22 in the fitting hole. By caulking the V groove of the protruding portion 23 projecting to the lower side of 24 (pushing and deforming outwardly indicated by arrow A), both members 21 and 22 are combined and integrated. When a twisting force is applied to the square pipe member 20 thus obtained, the U-shaped member 21 alone is relatively easily twisted. However, the fitting hole 24 of the reinforcing plate 22 causes the protrusion portion of the U-shaped member 21 to be bent. Since the displacement on the plane of 23 is restrained, the twist is also restrained, and as a result, it has the same torsional rigidity as that of the single pipe.

The U-shaped member 21 and the reinforcing plate 22 are provided with holes 25 and 26 for fastening screws to the side plate 30, respectively. That is, two holes 2 are provided at both ends of the upper surface of the U-shaped member 21 in the longitudinal direction.
5 are provided, and holes 26 are provided in the upright pieces 27 as shown in the figure, which are bent and formed at both ends in the longitudinal direction of the reinforcing plate 22. Standing piece 2 provided with a screw fastening hole 26 on the reinforcing plate side 22
7 is designed to be retracted slightly inward from the end face in the longitudinal direction of the U-shaped member 21. With this configuration, the end face of the U-shaped member and the side plate are brought into close contact with each other when the side plate 30 is fastened. Produces the effect of The screw fastening holes 25 of the U-shaped member 21 are screw-fastened to the holes 31a with the eave-shaped receiving plate 31 provided on the side plate 30 inserted in the U-shaped member. The holes 26 of the reinforcing plate 27 are screw-fastened while being aligned with the holes 32 of the side plate. Since the square pipe material used in the present embodiment and all of the following embodiments is configured by combining the U-shaped member 21 and the reinforcing plate 22, the processing of the end shape is performed by the conventional square pipe. Free compared to. That is, since the U-shaped member 21 is realized by press working, the degree of freedom of the end shape becomes greater than that of a normal square pipe, and the shape design according to the fastening method becomes possible. In particular, since screws can be screwed on for welding, it is possible to obtain effects such as improvement in transportation efficiency of parts and prevention of thermal deformation.

Next, FIG. 2 is a bottom perspective sectional view of a square pipe material according to a second embodiment of the present invention. In the square pipe member 20 shown in FIG. 1, there is no restraint between the corner fitting holes 24 (longitudinal direction), which is the caulking position of the reinforcing plate 22, so that it is low against vibration from the driving source. It is easy to cause frequency resonance. Therefore, a flat plate 35 made of metal or the like is adhered to the bottom surface of the reinforcing plate 22 with an adhesive or a double-sided adhesive tape 36 to form a damping steel plate, and the flat plate 35 thus adhered is used as a slide rail. Is. As a result, the material forming the pipe can be made inexpensive. When the flat plate 35 is used as a slide rail, its shape is limited, but when it is not used as a slide rail, various modifications are possible.

FIGS. 3 (a) and 3 (b) are perspective views of a main part of a reinforcing plate used for a square pipe material according to a third embodiment of the present invention.
U-shaped member (slide rail combined stay) 2 not shown
As the configuration of 1, the type of FIG. 1 is assumed. In this embodiment, a slide rail is formed on the upper surface of the U-shaped member 21. The example of the form shown in FIG. 3 (a) has a fitting hole 24 of the reinforcing plate 22.
By forming the drawn portion 40 therebetween, the bending strength of the portion where resonance is likely to occur (the flat plate portion between the fitting holes) is increased to suppress the generation of low frequency vibration. Further, in the embodiment shown in FIG. 3 (b), by forming the burring portion 41 between the fitting holes 24 of the reinforcing plate 22, the bending strength of the portion where resonance is likely to occur (the flat plate portion between the fitting holes) is improved. By raising it, the generation of low frequency vibration is suppressed.
It should be noted that, compared with the drawing processing section 40, the burring processing section 41
Is advantageous in that the weight can be reduced. Further, the directions of the protrusions respectively generated by the drawing process and the burring process may be either direction. That is, in the illustrated example, all of them project downward, but they may project upward.

FIG. 4 is a vertical cross-sectional view of a square pipe material according to a fourth embodiment of the present invention. A projecting portion 23 positioned at a predetermined interval on the end edge 21a of the U-shaped member 21 shown in FIG. It is characteristic that at least a part of the edge between the two is a protruding edge portion 45 that protrudes in a tapered shape as shown in the figure. The opening edge 21a of the U-shaped member 21 of FIG.
Although it was configured to be flat so as to come into surface contact with the upper surface of the reinforcing plate 22 when fitted and crimped inside, the protruding edge portion 45 of this embodiment protrudes for a predetermined length, so the protruding portion 23 When the caulking is carried out by fitting into the fitting hole 24, the protruding edge portion 4
The top of 5 presses the upper surface of the reinforcing plate 22 slightly downward,
By applying stress, it is possible to suppress the generation of low frequency vibration from the flat surface between the fitting holes. The shape, size, etc. of the projecting edge portion 45 are not limited to those shown in the figure, and when the protruding portion 23 is inserted into the fitting hole 24 and the lower end is caulked, the reinforcing plate 22 is pressed to bring it into a locked state, and All configurations that can inhibit frequency vibration are included in the present embodiment.

FIG. 5 is an exploded perspective view of essential parts of a fifth embodiment of the present invention. This embodiment is a modification of the embodiment of FIG. 1, and the same parts are designated by the same reference numerals, but U-shaped. Positioning protrusions 50 are provided on the opposing edges of the strip-shaped member 21,
Positioning holes 51 for receiving these protruding pieces 50 are provided on the side plate 30 side. The upper corner of the positioning protrusion 50 is chamfered as an inclined surface. Reference numerals 52, 53 and 54 are screws. As the positioning protrusion 50 is inserted into the positioning hole 51 of the side plate 30, the inclined surface comes into contact with the upper inner wall of the positioning hole 51 and is guided and intrudes downward in the drawing. As a result, the back side of the upper surface (slide rail surface) of the U-shaped member 21 and the upper surface of the side plate receiving plate 31 can be brought into close contact with each other, and the position in the Z direction (upward direction) in the drawing is determined. Further, since the parts can be held in this state, temporary assembly can be performed without using screws or the like. Further, since the position in the X direction in the drawing can be determined by setting the widthwise dimension of the positioning hole 51, it is possible to position the U-shaped member 21 serving as the slide rail by fastening only the screw 52. Become. The screws 53 and 54 are merely for ensuring strength. Note that FIG. 6 is a modification, and in order to utilize the elasticity of the material of the U-shaped member 21, notches 55 may be provided on both upper and lower sides of the positioning protrusion 50. In the example of FIG. 6 also, the inclined surface is formed at the upper corner portion of the positioning projection 50, but in this embodiment, the projection 50 itself is elastically deformable in the vertical direction, so that the positioning hole 51 is formed. By inserting the projecting piece 50, it is possible to more easily secure the positional accuracy of the upper piece 21A of the U-shaped member serving as the slide rail surface (positional accuracy with the contact glass positioned immediately above).

In each of the embodiments of FIGS. 5 and 6, the square pipe member 20 and the side plate are brought into close contact with each other by tightening the screw at one place, and the rail surface (the upper surface of the U-shaped member or the reinforcing plate) with respect to the side plate. Underside)
This is for positioning. Considering the screw fastening of ordinary slide rails, the screw fastening will be performed at two to three places at one joint between the side plate and the square pipe material, but when using the square pipe material as the slide rail. In addition to achieving close contact with the side plate, it is necessary to position the rail surface. On the other hand, according to the present embodiment, the side plate and the square pipe material can be brought into close contact with each other and the rail surface can be positioned by tightening the screw 52 at one place. Screw 5
Since 3 and 54 are merely for securing strength as described above,
It is not necessary for positioning. The upper piece 21 of the U-shaped member
When A is used as a slide rail, the positional accuracy with the contact glass located directly above it is required to be extremely strict, but the contact glass is placed directly on the upper part of the side plate 30, and other parts are interposed therebetween. Therefore, it is relatively easy to secure the positional accuracy between the U-shaped member and the U-shaped member.

Next, the joint between the square pipe material and the side plate, which is the slide rail, needs to be firmly fastened, but a method of realizing this with a small number of screws and screw tightening work will be described below. Shown in. First, the square pipe material 20 shown in FIG.
U-shaped member 21 and reinforcing plate 22 (see FIGS. 1, 2, 3, and 4)
Etc.), and the U-shaped member 21 has a positioning projection 60 and a positioning projection 6 at the end edges facing each other.
It has a fixing pin insertion hole 61 formed in 0 and a positioning protrusion plate 62 protruding from the edge of the upper piece in an eaves shape. Positioning holes 6 for receiving the two positioning protrusions 60 and one positioning protrusion plate 62 are formed in the side plate 30 facing this.
3, 64 are formed. For this reason, the square pipe material 20 serving as the slide rail has the positioning holes 63, 6 on the side plate.
4 and the positioning protrusions 60 and 62 are fitted to each other, so that positioning in two directions parallel to the plane of the side plate is performed. Since the fixing pin insertion hole 61 of the positioning projection 60 inserted into the positioning hole 63 of the side plate projects from the opposite side of the side plate, when the fixing pin 65 is inserted into both projecting holes 60, the fixing pin 65 has a large size. The side wall surface is pushed by the outer peripheral surface of the diameter portion, and the small diameter portions at both ends in the axial direction are configured to be engaged in the both holes 60, so that the square pipe member 20 is closely attached to the side plate surface. Fixed pin 65
Has a through screw hole 65a on the outer peripheral surface.
By screwing the screw 66 through the a, the tip portion of the screw 66 protruding from the side opposite to the large diameter portion of the fixing pin is attached to the side plate 30.
The fixing pin 65 is fixed by making contact with the outer side surface of the.

The shape of the fixing pin 65 is, for example, as shown in FIG.
It may be something like. The fixing pin 65 includes a non-cylindrical large-diameter portion 65A and a shaft member 65B integrally projecting at eccentric positions on both axial end faces of the large-diameter portion 65A,
A groove 65 for inserting a driver is provided on the end surface of each shaft member 65B.
C is formed. After the fixing pin 65 is inserted into the fixing pin insertion hole 61 of FIG. 7 in the posture of FIG. 8, the driver is inserted into the groove 65C of the shaft member 65B and rotated by 180 degrees. Face 65D is side plate 30
The square pipe member 20 is securely fixed by pressing it toward the surface.

FIG. 9 shows another embodiment. In this embodiment, only the positioning projection plate 62 projecting from the end edge of the upper piece in an eaves-like shape is provided at the axial end edge of the U-shaped member 21. On the other hand, the fixing pin insertion hole 6 provided in the positioning protrusion 60 of FIG.
Instead of 1, the fixing pin insertion hole 70 is provided at a position near the ends of the two side pieces of the U-shaped member 21 itself. Side plate 30
A positioning hole 64 and a screw hole 71 are formed on the side, and the position, shape, dimension, etc. are set so as to receive the positioning projection plate 62 and the screw 66, respectively. The fixing pin 65 is the same as that of the embodiment shown in FIG. In this embodiment, the positioning protrusion plate 62 is inserted into the positioning hole 64, and the fixing pin 65 is inserted into the fixing pin insertion hole 70.
Is inserted into the hole 71 and screwed into the screw hole 65a of the fixing pin 65, whereby the accurate positioning and fixing of the square pipe member 20 to the side plate 30 is completed. This square pipe material 20
As in the case of all the above-mentioned embodiments, by using as a slide rail and stay for guiding components such as the carriage of the image scanner, accurate positioning and the like can be performed with the minimum necessary fixing components. Also, in the process of assembling various parts into the frame structure, by assembling each pipe material to the side plate, it is possible to perform the assembly with sufficient frame strength secured from the beginning of the process. High positioning accuracy can be secured from the beginning. Although the frame structure of the image reading apparatus has been described in the above-described embodiment, the frame structure of the present invention is not limited to this, and a casing of electronic equipment such as OA equipment and communication equipment, electric equipment, mechanical equipment, and the like. It can be applied to the body frame structure in general.

[0016]

As described above, the present invention provides a solution to the disadvantages that improve the assembling ability while maintaining the high rigidity of the frame structure from the initial stage of the assembling, and the derivation thereof. That is, when forming a high-strength frame structure by inserting a square pipe between the side plates, there are problems such as deterioration of workability during welding, occurrence of heat distortion, and cost increase. It solves the problem of reduced transport efficiency when transporting to. That is, in the frame structure according to claim 1, the square pipe member 20 is
Since the U-shaped member 21 and the reinforcing plate 22 are combined and configured, the end shape can be processed more freely than the conventional square pipe. That is, since the U-shaped member 21 is realized by press working, the degree of freedom of the end shape becomes greater than that of a normal square pipe, and the shape design according to the fastening method becomes possible. In particular, since screws can be screwed on for welding, it is possible to obtain effects such as improvement in transportation efficiency of parts and prevention of thermal deformation.

In the frame structure according to the second aspect, since the surface formed as the damping steel plate is used as the slide rail, there is no intermediate vibration transmitting portion and a high damping effect can be obtained. Further, since the slide rail is a separate member, it is possible to use an inexpensive material as a material for forming each pipe. In the frame structure according to the third aspect, since the vibration damping effect can be obtained without adding any parts, it is difficult to increase the cost. In the frame structure according to claim 4, since the basic fastening (positioning) of the slide rail and the side plate can be performed by the screw fastening work at one place,
Secure assembly is possible. Further, it becomes possible to improve the assembling property by the temporary assembly. In the frame structure according to the fifth aspect, the positioning and the fastening can be separated, and the fastening can be performed by screw fastening or operation at one place, so that the assemblability is improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a square pipe member according to a first embodiment of the present invention.

FIG. 2 is a perspective sectional view of an essential part of a square pipe material according to a second embodiment of the present invention.

3 (a) and 3 (b) are perspective cross-sectional views of a main part of a square pipe material according to a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a square pipe material according to a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a square pipe material according to a fifth embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a square pipe material according to a sixth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of a square pipe material according to a seventh embodiment of the present invention.

FIG. 8 is a diagram showing another configuration example of a fixing pin.

FIG. 9 is a vertical cross-sectional view of a square pipe material according to an eighth embodiment of the present invention.

FIG. 10 is an exploded perspective view of a conventional frame structure.

FIG. 11 is an exploded perspective view of another conventional frame structure.

[Explanation of symbols]

20 square pipe material, 21 U-shaped member, 21a opening edge, 22 reinforcing plate, 23 protruding portion, 24 fitting hole, 2
5, 26 holes, 30 side plate, 31 receiving plate, 32 side plate hole, 35 flat plate, 36 adhesive, or double-sided adhesive tape,
40 Drawing processing part, 41 Burring processing part, 45 Projection edge part, 50 Positioning projection piece, 51 Positioning hole, 5
2, 53, 54 screw, 60 positioning protrusion, 61 fixing pin inserting hole, 62 positioning protruding plate, 63, 64 positioning hole, 65 fixing pin, 66 screw, 70 fixing pin inserting hole, 71 screw hole.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-271131 (JP, A) JP-A-7-307843 (JP, A) JP-A-60-137534 (JP, A) JP-A-2- 134199 (JP, A) JP 63-91483 (JP, A) JP 7-303541 (JP, A) JP 4-282686 (JP, A) JP 4-282685 (JP, A) 63-58999 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 15/00 G03G 15/00 550 G03G 21/16-21/18 H04N 1/04-1 / 207

Claims (5)

(57) [Claims] 1. A square pipe member comprising a U-shaped member having a U-shaped cross-sectional shape, and a flat plate-shaped reinforcing plate mechanically coupled to an opening edge portion of the U-shaped member, A frame structure for electronic devices, etc., characterized in that both axial ends of a square pipe material are fixed by screws with side plates. 2. A frame structure for an electronic device or the like according to claim 1, wherein a flat plate which also functions as a slide rail is adhered to the reinforcing plate by an adhesive. 3. A reinforcing plate provided with a drawing portion or a barring portion on a surface of the reinforcing plate located between a plurality of joints between the reinforcing plate and the opening edge of the U-shaped member. 3. The electron according to claim 1 or 2, wherein the strength of the electron beam is improved, or a projecting edge portion is provided at the opening edge of the U-shaped member to improve the bonding strength with the reinforcing plate. Frame structure of equipment. 4. A positioning protrusion is provided axially on the axial end edge of the U-shaped member, and a side plate is formed with a positioning hole for receiving the positioning protrusion. The positioning protrusion is formed in the positioning hole. The frame structure for an electronic device or the like according to claim 1, 2 or 3, wherein the shapes of the positioning protrusions and the positioning holes are set so that the positioning can be performed in two directions during the insertion process. 5. The electronic device according to claim 1, 2, 3 or 4, wherein the axial end surface of the square pipe member and the side plate can be fastened at one position each. Frame structure.