JPH045385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a frame for a copying machine, and more particularly, to a frame for a copying machine, in which a front frame and a rear frame are assembled on a bottom plate, and an optical system frame is attached to the front frame and the rear frame. Concerning the frame of a copying machine.

(Prior art) An interesting prior art for this invention is, for example, Japanese Patent Application Laid-Open No. 58-194045 published on November 11, 1982.
It is disclosed in the publication No. This publication discloses, as a prior art, a frame shown in FIG. 1 in which a bent piece at the lower end of a side plate is placed on the upper surface of a bottom plate, and the bent piece and the bottom plate are fixed with screws. In the frame described as the prior art in this publication, the bent pieces of the side plates are in contact with the bottom plate, so the relative positions of the side plates and the bottom plate vary greatly depending on the bending accuracy of the bent pieces. Sometimes.

Therefore, the above-mentioned publication discloses a copying machine frame in which an embossed protrusion is formed on one of the bottom plate and the side plate, and a hole into which the emboss is fitted is formed on the other side.

(Problems to be Solved by the Invention) In the conventional frame in which the emboss and the hole are fitted together, the height of the emboss is limited by the thickness of the plate, and it is difficult to securely lock the emboss in the hole. It is difficult to obtain the required height. Furthermore, when such a protrusion is formed by embossing, the tip of the embossing inevitably becomes rounded, which, together with the fact that the height of the embossing is not sufficient as mentioned above, does not necessarily result in a sufficient height. There was a problem that positioning accuracy could not be obtained.

Therefore, a main object of the present invention is to provide a copying machine frame that can be assembled with high positioning accuracy.

(Means for Solving the Problems) This invention provides a cut surface, a bent piece whose lower end surface is located above the cut surface, and a bent piece that protrudes below the cut surface at the lower end of each of the front frame and the rear frame. A fitting hole is formed in the bottom plate having an inner edge that restricts the positions of both main surfaces and both longitudinal end surfaces of the protruding piece, and the protruding piece is fitted into the fitting hole. This is a copying machine frame whose cut surface comes into contact with the top surface of the bottom plate when the machine is opened.

(Function) When the protruding pieces formed at the lower ends of the front frame and the rear frame are fitted into the fitting holes formed in the bottom plate, the inner edges of the fitting holes are aligned with the positions of both main surfaces of the protruding pieces and both lengthwise ends. Lateral positioning of the front and rear frames is achieved by regulating the positions of the surfaces, respectively. At the same time, the cut surface is butted against the top surface of the bottom plate, so that the bottom end surface of the folded piece is spaced apart from the top surface of the bottom plate in this state. Therefore, the position of the cutting surface is regulated by the upper surface of the bottom plate, and the positioning of the front frame and the rear frame in the height direction is achieved.

(Effects of the Invention) According to the present invention, the bending accuracy of the lower ends of the front frame and the rear frame does not affect the positioning accuracy of these frames in the height direction.

Furthermore, the lateral positioning accuracy of the front frame and rear frame depends on the machining accuracy of the fitting holes and protruding pieces, and the height positioning accuracy depends on the machining accuracy of the cut surface, but both of these Since the front frame and the rear frame can be processed with relatively high accuracy by punching or the like, sufficient positioning accuracy can be obtained in both the lateral direction and the height direction of the front frame and the rear frame.

Furthermore, manufacturing is easy because there is no need for complicated machining such as embossing and holes that engage with the embossing, unlike in the past.

If the front frame, the rear frame, and the optical system frame are positioned using pin holes and pins that fit into the pin holes as in the embodiment, the machining accuracy of the pin holes and pins will be good, and it will be possible to use a simple screwdriver. Compared to a system in which the optical system frame is positioned using a stopper, the positioning accuracy of the optical system frame not only in the height direction but also in the lateral direction is dramatically improved.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is a perspective view showing an embodiment of the present invention. The frame 10 of the copying machine includes a bottom plate 12 having a substantially rectangular planar shape, and on the top surface of the bottom plate 12, a rear frame 14, and a front right frame 16 and a front left frame 18, which cooperate with each other to constitute a front frame, are arranged. Assembled almost vertically. An optical system frame 20 is attached to the upper end of each of the frames 14, 16, and 18 for holding an optical system of the electronic copying machine, such as a light source and a mirror. This optical system frame 20 is composed of four frame members 22, 24, 26 and 28.

The frame 10 of such a copying machine is fixedly housed in the housing of the electronic copying machine shown in FIG. 2, and thereby positions the photoreceptor drum 34 and various components shown by dotted lines in FIG. And support.

In a copying machine, the photosensitive drum 34 and the optical system must be assembled with great precision. This is because if their relative positional relationship deviates, blurring, deviation, or distortion will occur in the obtained copied image. For this reason, the accuracy of the optical system frame 20 in the height direction and in the lateral direction is particularly important. In this embodiment, the height direction of the optical system frame 20 is mainly arranged between each frame 14, 16 and 18 and the bottom plate 12.
The optical system frame 20 is positioned by butting the cut surface of the abutting part or fitting part 30 with the top surface of the bottom plate, and the lateral positioning of the optical system frame 20 is mainly performed by the pin provided on the pin mounting plate 32 and this pin. This is achieved by a pin hole through which the pin hole is inserted.

As shown in FIG. 3, at the lower ends of each of the rear frame 14, the front right frame 16, and the front left frame 18, a protruding piece 36 and a bent piece 38 are formed, for example, by punching. Ru. As shown in FIG. 5, the projecting piece 36 is formed to project downward from a cut surface 46 formed at the lower ends of the frames 14, 16, and 18. The tip of the protruding piece 36 is formed to be inclined, so that the protruding piece 36 can be easily inserted into the fitting hole 42 (FIG. 4) of the bottom plate 12.

Bending piece 3 positioned so as to sandwich the protruding piece 36
8 is bent at a right angle to the vertical plane (principal plane) of each frame 14, 16, and 18, and its lower surface 38a (FIG. 5) meets the cut surface 46.
It is formed so as to be located above by a distance G3. A hole 40 for screwing is formed in this bent piece 38.

As shown in FIG. 4, in the bottom plate 12, fitting holes 42 into which the protruding pieces 36 of the frames 14, 16, and 18 described above are inserted and fitted are formed at predetermined positions, for example, by punching. At the same time, holes 44 for screwing are formed at predetermined positions corresponding to the holes 40 for screwing (FIG. 3).

As can be clearly seen from FIG. 4, the fitting hole 42 is formed in the shape of a key or a step. Fitting hole 42
By forming the hole 42 into such a shape, it is possible to easily fit the protruding piece 36 therein, and to sufficiently increase the strength of the press mold for forming the fitting hole 42. . That is, the fourth
As shown in the figure, assuming that the thickness of the protruding piece 36 is T, the width of the fitting hole 42 is formed to be larger than this thickness T by a dimension G1 and/or G2. Therefore, when fitting the protruding piece 36 into this fitting hole 42, the width of the fitting hole 42 is equal to the thickness of the protruding piece 36 at any position in the direction of the length L2 of the fitting hole 42. There is a margin of at least G1 or G2 from T. This facilitates insertion of the protruding piece 36 into the fitting hole 42.

Further, in order to form the fitting hole 42 with a width corresponding to the thickness T of the protruding piece 36, it is necessary to use a press mold having a width corresponding to the thickness T. Since the thickness T is generally not very large,
Although the press mold becomes thinner, if gaps G1 and G2 are provided as in this example, the thickness of the press mold can be increased by the gap, thereby increasing its strength. .

Referring to FIG. 5, the rear frame 14 and front right frame 16 shown in FIG. 3 are placed on the bottom plate 12 shown in FIG. 4.
When assembling the front left frame 18, the protruding piece 36 is inserted into the fitting hole 42 of the bottom plate 12. At this time, the fitting hole 42 for the length L1 of the protruding piece 36
The length L2 is, for example, from 0.05 to the length L1 so as to have the minimum necessary clearance.
It is enlarged by about 0.1mm. With such a minimum clearance, the lateral position of each frame 14 to 18 with respect to the bottom plate 12 can be restricted.

Further, the cut surface 46 near the protruding piece 36 is
It comes into contact with the top surface of 2. Therefore, the height direction of these frames 14, 16 and 18 is the same as the cut plane 4.
It will be regulated by 6. Since the cutting process has better processing accuracy than the bending process, the processing accuracy of the cut surface 46 is relatively good. Therefore, the positional accuracy in the height direction of these frames 14, 16, and 18, which depends on the accuracy of the cut surface 46, is also good.

Note that the lower surface 38a of the bent piece 38 is the cut surface 4.
6, a gap G3 is formed between the lower surface 38a and the upper surface of the bottom plate 12 in the state shown in FIG. That is, each frame 1
The bent pieces 38 of 4, 16, and 18 have no effect on the positioning of the frame in the height direction, and the accuracy in the height direction primarily depends on the processing accuracy of the cut surface 46. become.

In the state shown in FIG. 5, the holes 40 formed in the bent piece 38 and the holes 44 formed in the bottom plate 12,
As shown in FIG. 1, screws 48 are inserted to secure the folding pieces 38, that is, each frame 14, 16, and 18, to the bottom plate 12. With the screw 48 tightened in this way,
At that part, the lower surface of the bent piece 38 naturally comes into contact with the upper surface of the bottom plate 12, but the frame 1
It does not affect the positional accuracy in the height direction of Nos. 4 to 18.

Each frame 14, 16 as shown in FIG.
and 18 on the bottom plate 12, an optical system frame 20, shown in FIG. 6, is attached to each frame 14-18, as shown in FIG.

As shown in FIG. 3, a pin hole 5 having an inner diameter D1 is provided in the right side of the rear frame 14 and the front right frame 16 at a constant length L4 from the cut surface 46.
0 is formed. Further, a rectangular pin hole 52 having a length L3 and a height H is formed on the left side of the rear frame 14 and the front left frame 18 at the same height position as the pin hole 50. These pin holes 50
and a hole 54 for screwing in the vicinity of 52.
is formed.

On the other hand, as shown in FIG.
A pin hole 56 having an inner diameter D1 is formed on the right side of the frame members 24 and 22 before and after the pin hole 0.
A rectangular pin hole 58 having a length L3 and a height H is provided on the left side of the front and rear frame members 24 and 22 of the optical system frame 20, separated from the pin hole 56 by a certain length L5. It is formed. Holes 60 for screwing are formed near these pin holes 56 and 58, respectively.

Note that the pin holes 50 and 52 of the rear frame 14
Similarly to the pin holes 56 and 58 of the optical system frame 20, the distances between the two need to be separated by a length L5.

The pin attachment plate 32 shown in FIG.
A pin 62 having an outer diameter D2 is attached, for example by caulking. The tip of the pin 62 is formed as a tapered portion 64, so that the pin 62 can be easily inserted into the pin hole described above. Then, pin 6 of the pin mounting plate 32
A hole 66 for screwing is formed near 2.

Note that the distance between the pin 62 and the screw hole 66 is the distance between the pin hole 50 and the screw hole 54 in FIG. 3, and the distance between the pin hole 50 in FIG.
6 and the hole 60 for screwing, respectively. On the other hand, the distance between the rectangular pin hole 52 and the screw hole 54 (FIG. 3) and the distance between the rectangular pin hole 58 and the screw hole 60 are not necessarily equal to the distance between the pin 62 and the screw hole 66. It does not have to be equal to the distance between the two, but can be formed close to it. This is because the pin holes 52 and 58 are elongated holes, so that some deviation can be absorbed.

When assembling the optical system frame 20, as shown in FIG.
6 and the front left frame 18, the four frame members 22 to 28 shown in FIG.
Optical system frame member 20 assembled by
Place. Then, the pin holes 50 of the rear frame 14 and the front right frame 16 are made to correspond in position to the pin holes 56 of the frame members 22 and 24.
In this state, using the pin mounting plate 32 shown in FIG.
Insert. The outer diameter D2 of the pin 62 is, for example, 0.05 to 0.1 with respect to the inner diameter D1 of the pin holes 50 and 56.
It is formed with a clearance of about mm. With the pins 62 inserted into the pin holes 50 and 56, the square pin holes 52 of the rear frame 14 and the front left frame 18 are made to correspond to the square pin holes 58 of the frame members 22 and 24. By making one of the pin holes 52 and 58 long, it is possible to absorb variations in the length L5, and also to prevent variations in dimensions when the pin 62 is caulked to the pin mounting plate 32, for example, when the pin 62 is caulked at an angle. It is also possible to absorb dimensional variations such as in the case of

In this way, the pins 62 are placed in the pin holes 50 and 56, and the pins 62 are placed in the pin holes 52 and 58.
are inserted into the screw holes 54 and 66, and into the screw holes 60 and 66, respectively.
) is inserted, and by tightening the screws, the rear frame 14, frame member 22, and pin attachment plate 32 are fixed, the front right frame 16, frame member 24, and pin attachment plate 32 are fixed, and the frame member 24, the front left frame 18, and the pin attachment plate 32 are fixed.

In this way, the rear frame 14, the front right frame 1
6 and front left frame 18 and optical system frame 20
If these are positioned using the pin holes and the pins, each of the frames 14 to 18 and the optical system frame 20 can be temporarily fixed using the pins.
Furthermore, by setting the clearance between the outer diameter D2 of the pin and the inner diameter D1 and height H of the pin hole to a minimum, the optical system frame 20 can be positioned with extremely high accuracy. That is, the fixed height L4 of the pin hole (Fig. 3) and the cut surface 46 (Fig.
By cooperating with the optical system frame 20 shown in FIG. Further, the lateral deviation is regulated by the length L5 (FIG. 6).

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is an external view showing an example of an electronic copying machine to which the embodiment shown in FIG. 1 is applied. FIG. 3 is an exploded perspective view showing the rear frame, front right frame, and front left frame. FIG. 4 is a perspective view showing the bottom plate. FIG. 5 is a partially enlarged view showing the fitting portions of the rear frame, front right frame, and front left frame to the bottom plate. FIG. 6 is a perspective view showing the optical system frame. FIG. 7 is a perspective view showing the pin mounting plate. In the figure, 10 is the frame of the copying machine, 12 is the bottom plate, 14 is the rear frame, 16 is the front right frame,
18 is the front left frame, 20 is the optical system frame, 3
0 is a fitting part, 38 is a bent piece, 46 is a cut surface,
50, 52, 56, 58 are pin holes, 44, 54,
60 and 66 are screw holes, and 62 is a pin.

Claims (1)

[Scope of Claims] 1. A copying machine frame in which a front frame and a rear frame are vertically provided on the upper surface of the bottom plate, and an optical system frame for incorporating an optical system is attached to the front frame and the rear frame, comprising: and a cut surface, a bent piece whose lower end surface is located above the cut surface, and a protrusion piece that protrudes downward from the cut surface, at each lower end of the rear frame, and the protrusion is formed on the bottom plate. A fitting hole is formed having an inner edge that restricts the positions of both main surfaces and both longitudinal end surfaces of the piece, and when the protruding piece is fitted into the fitting hole, the cut surface is the upper surface of the bottom plate. A copying machine frame, characterized in that the frame is brought into contact with the frame. 2. The protruding piece has first and second main surfaces,
The fitting hole has first and second inner edges that abut the first and second main surfaces of the protruding piece, respectively, and opposite the first and second inner edge portions of the protruding piece, respectively. 2. A copying machine frame according to claim 1, having third and fourth inner edges forming a gap with the second and first major surfaces of the piece. 3. A first hole for screwing formed in the bent piece, a second hole for screwing formed in the bottom plate corresponding to the first hole, and the first hole and inserted into the second hole,
3. The copying machine frame according to claim 1, further comprising screws for fixing the front frame and the rear frame to the bottom plate. 4. A pin hole and a third hole for screw fastening formed in corresponding positions of the optical system frame, the front frame, and the rear frame, respectively; a pin mounting plate; and a third hole formed in the pin mounting plate; a locking member including a pin fitted into a pin hole, and a fourth hole for screwing formed in the pin mounting plate corresponding to the third hole, the locking member being inserted into the third and fourth holes; Claim 1, further comprising screws for fixing the optical system frame and the front frame and the rear frame, respectively, and at least one of the pin holes is formed as a horizontally long elongated hole. The copying machine frame according to any one of items 1 to 3.