JPH051469B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a shell-type copying machine, which includes a lower support frame and a lower part that can freely pivot between a closed position and an open position about a pivot axis extending in the front-rear direction. The present invention relates to a shell-type copying machine comprising an upper support frame attached to a support frame.

As mentioned above, such shell type copying machines have been proposed and put into practical use, but in the conventional shell type copying machines, the upper support frame attached to the lower support frame is connected to After positioning the copying machine from the closed position to the open position centering on the heart, the copying paper stuck inside the copying machine was removed, developer was replenished, and the copying machine was maintained and inspected. However, in such conventional shell-type copying machines, the upper support frame can only be reliably positioned and fixed at a predetermined release angle position with respect to the lower support frame, resulting in copy paper jams. It is difficult to remove in some places, and it is also difficult to maintain and inspect the components of the copying machine located near the pivot axis. Furthermore, when assembling a copying machine, the workability of assembling the upper support frame and the lower support frame of the copying machine suffers from the disadvantage that the upper support frame is only positioned and fixed at a predetermined release position. As a result, it had technical issues that were extremely poor.

The present invention has been made in view of the above facts, and an object of the present invention is to easily remove copy paper jammed inside a copying machine, which occurs as described above, with a simple configuration, and to configure the copying machine. It is an object of the present invention to provide a copying machine which makes it extremely easy to maintain and inspect its components, and further facilitates the assembly of the copying machine.

According to the present invention, a shell type comprising a lower support frame and an upper support frame attached to the lower support frame so as to be pivotable between a closed position and an open position about a pivot axis extending in the front-rear direction. The copying machine has a groove that is arranged coaxially with the rotation center axis, rotates as the upper support frame rotates, and has a wide groove and a narrow groove connected to each other via a step. A connecting member, a threaded member that integrally includes a long diameter portion that is arranged to enter the groove and has a diameter corresponding to the wide groove, and a short diameter portion that has a diameter that corresponds to the narrow groove, and the upper support. a biasing means that acts to pivot the frame body from a closed position to at least a first open position about the pivot center axis; and a biasing unit that moves the upper support frame body to a closed position against the biasing force of the biasing unit. When the locking means for positioning and the locking means are released and the upper support frame is rotated by the urging means, the long diameter part of the screw member comes into contact with the stepped part of the groove, and the rotation of the connecting member is prevented. a first fixing means comprising the groove and a screw member that is regulated and positions the upper support frame in the first open position; and rotating the screw member to cause a small diameter portion of the screw member to fit into the narrow groove. a release means that allows rotation of the connecting member by entering the member; and a release means that allows the connecting member to rotate when the upper support frame is rotated about the central axis, and the minor diameter portion of the threaded member is located at the end of the narrow groove. and a second fixing means comprising the groove and a screw member, the upper support frame being positioned in a second open position having a larger release angle than the first angular position by being abutted against the groove. A shell-type copying machine is provided.

Hereinafter, preferred embodiments of a copying machine constructed in accordance with the present invention will be described with reference to the accompanying drawings.

First, the overall structure of a specific example of a copying machine constructed according to the present invention will be outlined.

FIG. 1 is a simplified sectional view showing a specific example of a copying machine constructed according to the present invention, and FIG. 2 is a diagram showing a state in which the upper support frame of the copying machine shown in FIG. 1 is released. be.

Referring to FIG. 1, the illustrated copying machine has a generally rectangular parallelepiped-shaped housing, which is generally designated by the number 2. As shown in FIG. The housing 2 is defined by a lower support frame 4 and an upper support frame 6.
Referring to FIG. 4 together with FIG. 1, the lower support frame bodies 4 are arranged at predetermined intervals in the front-rear direction (direction perpendicular to the page in FIG. 1, left-right direction in FIG. 4). a vertical front substrate 8 and a vertical rear substrate 10, and a lower plate 1 fixed to the lower ends thereof.
Contains 2. The lower plate 12 includes a bottom wall portion 14 that defines the bottom surface of the housing 2, and both lower wall portions 16 and 18 that define substantially lower half portions of both side surfaces of the housing 2.
has. On the other hand, the upper support frame 6 includes a vertical front substrate 20 and a vertical rear substrate 22 arranged at a predetermined interval in the front-rear direction, and an upper plate 24 fixed to the upper ends of these. The upper plate 24 includes a top wall portion 26 that defines the top surface of the housing 2, and a top wall portion 26 that defines the top surface of the housing 2.
Both upper wall portions 28 define substantially the upper half of both side surfaces of the
and 30. Such an upper support frame body 6 is
Swivels around the pivot center axis 34 between the closed position shown in solid lines in FIGS. 1, 2 and 3 and the open position shown in two-dot chain lines in FIGS. It is freely attached to the lower support frame 4. The above-mentioned pivoting operation of the upper support frame 4 will be described in detail later.

Normally, the upper support frame 6 is connected to the locking means 15 (second
1, 2, and 3, as shown in solid lines in FIGS. 1, 2, and 3. However, if necessary, the locking action of the locking means 15 can be released to open the upper support frame 6. The first center is centered around the rotation center axis 34.
It can be pivoted to the open position shown by two-dot chain lines in FIGS. 2 and 3.

On the top surface of the housing 2, there is a number 4 as a whole.
Document placement means 8 is arranged so as to be able to reciprocate in the left and right direction in FIG. The document mounting means 48 is mounted so as to be able to reciprocate between a scanning exposure start position indicated by a two-dot chain line 48A in FIG. 1 and a scanning exposure movement limit position indicated by a two-dot chain line 48B in FIG. .

Referring to FIG. 1, a rotary drum 64 having a photoreceptor on its circumferential surface is rotatably mounted approximately in the center of the housing 2. As shown in FIG. arrow 66
Around the rotating drum 64, which is rotated in the direction indicated by , there are, in order in the direction of rotation, a charging corona discharger 68, an optical system 70, an electrostatic latent image developing device 72, a transfer corona discharger 74, A stripping corona discharger 76, a cleaning device 80 having a cleaning blade 78, and a static elimination lamp 82 are provided. Further, a document irradiation lamp 84 is arranged in relation to the optical system 70. The original irradiation lamp 84 is inserted into the original placing means 4 through an opening 86 formed in the top wall 26 of the upper plate 24.
The original to be copied (not shown) placed on the transparent plate 52 of No. 8 is irradiated. Numerous elongated optical elements extending vertically (for example, Nippon Sheet Glass Co., Ltd.'s product name ``Self-Ox Micro Lens'')
The optical system 70, which is constructed by arranging lock-shaped lenses sold as Project.

Approximately the lower half of the housing 2 is marked with the number 88 as a whole.
A sheet member conveying device shown in is arranged. At one end of this sheet member conveying device 88, at the right end in FIG.
and a sheet member manual feeding device 92 located above it. Copy paper supply device 90
The copy paper cassette is inserted through the copy paper cassette receiving portion 96 in which the feeding roller 94 is provided and an opening 98 formed in the right side surface of the housing 2 (more specifically, the right lower wall portion 16 of the upper plate 12). It is configured in combination with a copy paper cassette 100 loaded in a receiving section 96, and by the action of the feeding roller 94, copies are made one by one from a sheet-like copy paper layer 102 stored in the copy paper cassette 100. Feed paper. The manual feeding device 92 includes a guide plate 106 projecting outward through an opening 104 formed on the right side of the housing 2, a guide plate 108 located above the guide plate 106, and a guide plate 108 located above the guide plate 106. A pair of feed rollers 110 and 112 are provided downstream of 106 and 108 (left side in FIG. 1). When a suitable sheet member such as a sheet of copy paper is positioned on the guide plate 106 and advanced to the nip position of the pair of feed rollers 110 and 112, the pair of feed rollers 110 and 112 nip the sheet member, Send this. The copy paper fed from the copy paper supply device 90 through between the guide plates 114 and 116, or the sheet member fed from the manual feed device 92 through the gap between the guide plates 114 and 118, is conveyed by a pair of conveying rollers 120 and 122.
The film is conveyed between the rotating drum 64, the transfer corona discharger 74, and the stripping corona discharger 76 through the guide plates 124 and 126.
Next, the image is conveyed by the action of a suitable conveyor belt mechanism 128 and sent to the fixing device 130 . Thereafter, the liquid is discharged into a saucer 134 through an opening 132 formed in the left side of the housing 2 (more specifically, the left lower wall 18 of the lower plate 12). Fusing device 130 includes a pair of fusing rollers consisting of an upper roller 136 and a lower roller 138 that cooperate with each other.

The sheet member from the pair of fixing rollers is discharged to the receiving tray 134 by the action of the pair of discharge rollers 140 and 142.

As can be easily understood by referring to FIG. 1, the rotating drum 64, the charging corona discharger 68, the optical system 70, the developing device 72, the cleaning device 80, the static elimination lamp 82, and the document irradiation Along with the lamp 84, the guide plate 108, feeding roller 110, and guide plate 11 of the sheet member conveying device 88
8. The conveyance roller 120 and the guide plate 124 are attached to the upper support frame 6. On the other hand, copy paper supply device 90, guide plate 106, feeding roller 112, guide plate 114, guide plate 116, conveyance roller 122,
The guide plate 126, the transfer corona discharger 74, the peeling corona discharger 76, the conveyor belt mechanism 128, the fixing device 130, and the tray 134 are attached to the lower support frame 4. Therefore, when the upper support frame 6 is opened from the closed position shown by the solid line to the open position shown by the two-dot chain line, most of the conveyance path of the sheet member is opened, and therefore the sheet member is prevented from being jammed. If this occurs, the blocked sheet member can be easily taken out.

In the copier as described above, while rotating drum 64 is rotated in the direction indicated by arrow 66, charging corona discharger 68 substantially uniformly charges the photoreceptor to a particular polarity and then charges the photoreceptor through optical system 70. The image of the original is projected onto the photoreceptor (at this time,
The document placement means 48 moves from the scanning exposure start position indicated by the two-dot chain line 48A in FIG. 1 to the right in FIG. 1), thus forming an electrostatic latent image corresponding to the document on the photoreceptor. Ru. A developer device 72 then applies toner particles to the electrostatic latent image on the photoreceptor to develop the electrostatic latent image into a toner image. Next, copy paper supply device 90 or sheet member manual feed device 9
A sheet member such as copy paper fed from 2 is brought into contact with the photoreceptor, and transferred to a corona discharger 7.
4, the toner image on the photoreceptor is transferred onto the sheet member. Thereafter, the sheet member is peeled off from the photoreceptor by the action of the peeling corona discharger 76. The sheet member onto which the toner image has been transferred is then conveyed to the fixing device 130, and after the toner image is fixed in the fixing device 130, the sheet member is transferred to the receiving tray 1.
It is discharged at 34. Meanwhile, the rotary drum 64 continues to rotate, and the cleaning device 80 removes residual toner particles from the photoreceptor, and the discharge lamp 82 causes the residual charge on the photoreceptor to disappear.

Hereinafter, the opening/closing mechanism of the discharger according to the present invention will be explained in detail.

FIG. 3 shows that the upper support frame 4 of the discharger body is rotated by the rotation mechanism 3 around the rotation center axis 34.
FIG. 4 is a diagram showing a state in which the closed position shown by a solid line in FIGS. , is a simplified cross-sectional view seen from the direction of the foliot A in FIG. 3, and FIG. 5 is an exploded perspective view of the turning mechanism 3 that turns the upper support frame 6 around the turning center axis 34. .

This will be explained below with reference to FIGS. 1 to 5.
In FIGS. 2 and 3, when performing normal maintenance or inspection to prevent paper jams inside the copying machine main body, the upper support frame 6 is positioned at the first open position 6a, and the upper support frame 6 is positioned inside the copying machine main body. All you have to do is remove the jammed paper, or perform maintenance and inspection. Furthermore, when a larger open space than the first open position 6a is desired, maintenance and inspection of components located near the swing mechanism 3 (components located on the right side in FIG. 1), for example, become necessary. When the upper holding frame 6 is
is further released from the open position 6a and positioned at the second open position 6b. As described above, by positioning the upper support frame 6 at the second open position 6b, the rotation mechanism 3 can be moved very easily and quickly.
maintenance and inspection of components located in the vicinity of the

Furthermore, when assembling the copying machine, when attaching the upper component to be placed on the upper support frame 6, the upper support frame 6
It is extremely easy to attach the upper component to the upper support frame 6 after positioning the upper component in the second open position 6b to obtain a large open space inside the copying machine.
This has the advantage that the copying machine can be assembled quickly.

As can be easily understood by mainly explaining FIGS. 3 to 5, in FIG. 3, 5 is a connecting member that connects the upper support frame 6 and the lower support frame 4; An insertion hole 501 is formed above, and a screw hole 601 (third
In the figures and FIG. 5, only the screw holes 601 formed in the vertical front substrate 20 are shown. ) is formed, and as shown in FIG. 5, the screw member 144 is inserted through the insertion hole 501 of the connecting member 5 and
01, the connecting member 5 is connected to the vertical front substrate 20 and the vertical rear substrate 2 of the upper support frame 6.
Fix it to 2. Next, a notch 401 (in FIGS. 3 and 5, a notch 401 formed in the vertical front substrate 8 and a notch 401 formed in the right side of the vertical front substrate 8 and the vertical rear substrate 10 of the lower support frame 4) (Only the notch 401 is shown) and the insertion hole 502 formed below the connecting member 5. The bearing member 13 is inserted outward from the inside of the copying machine main body, and then the substantially Z-shaped torsion bars 7, 9 are inserted. Biasing means 1 consisting of a combination of
1 (the biasing of the upper support frame 6 by the biasing means 11 will be described later), and a screw member 146 (as described later, the first fixing means,
and constitutes a part of the first release means. ) is inserted into the arc-shaped opening 503 formed in the connecting member 5, and the screw hole 40 formed in the right end of the vertical front substrate 8 and the vertical rear substrate 10 of the lower support frame 4 is inserted.
It is fixed by screwing it into 2. (In FIG. 5, only the screw hole 402 formed at the right end of the vertical front board 8 is shown.) Here, the biasing means 11 consisting of the above-mentioned pair of substantially Z-shaped torsion bars 7 and 9 is shown. The biasing will be explained in detail as follows. In FIG. 3, one end 7a of the torsion bar 7 is in contact with the lower part of an upright piece 403 formed on the right side of the vertical front substrate 8 of the lower support frame 4, while one end 9a of the torsion bar 9 is in contact with the upper support It comes into contact with a notch 504a (see FIGS. 3 and 5) of an upright piece 504 formed in the connecting member 5 fixed to the vertical front substrate 20 of the frame 6.

The other end 7b of the torsion bar 7 contacts the notch 504a of the upright portion 504 of the connecting member 5 fixed to the vertical rear substrate 22 of the upper support frame 6, while the other end 9b of the torsion bar 9 is in contact with the lower part of the upright piece 402 formed on the right side of the vertical rear substrate 10 of the lower support frame 4 . and,
The center of the biasing means 11 formed by the combination of the torsion bars 7 and 9 constitutes a pivot axis 34.

Further, continuing the explanation based on FIG. 5, the screw member 46 has a large diameter portion 146a formed to position the upper support frame 6 in the first open position 6a, and The connecting member 5 has a small diameter portion 146b formed to be further opened from the first open position 6a, and the connecting member 5 has a small diameter portion 146b that is formed to be opened further from the first open position 6a. When turning, the distance R between the turning center axis 34 and the screw member 146 (see Fig. 3)
It has an arcuate opening 503 formed with a turning radius of . Furthermore, the arcuate opening 503 is connected to the screw member 1.
46 to rotate the upper support frame 6 from the closed position to the first open position 6a against the urging force of the urging means 11. Large opening 503a
and the small diameter portion 1 formed in the screw member 146.
46b, and a small opening 50 formed in cooperation with the biasing means 11 to further release the upper support frame 6 from the first open position 6a.
3b.

The screw member 146 is inserted into the arcuate opening 503 of the fixing member 5.
After inserting into the screw holes 402 formed in the vertical front substrate 8 and the vertical rear substrate 10 of the lower support frame 4, the engagement formed at the tip of the screw member 146 is inserted. By engaging the E-type retaining ring 148 in the mating recess 146c, the screw member 146
The threaded engagement between the screw hole 402 and the screw hole 402 is reliably maintained.

Next, operating means for releasing the upper support frame 6 will be explained.

First, the upper support frame 6 is positioned in the closed position by the locking means 15 (see FIG. 2).
When the locking means 15 is released, the pivoting force of the biasing means 11 starts to rotate clockwise about the pivot axis 34. As shown in FIG. As described above, when the upper support frame 6 is rotated, the screw member 144 is inserted through the insertion hole 501 of the connecting member 5 and the upper support frame 6 is rotated.
Because it is fixed to the upper support frame 6 by screwing into the screw hole 601 formed in the right end of the vertical front board 20 and the vertical rear board 22, At the same time, the connecting member 5 is also pivoted about the pivot axis 34 by the same angle as the upper support frame 6. However, the large opening 503a of the arc-shaped opening 503 formed in the connecting member 5 is guided by the large diameter portion 146a of the screw member 146, and the left end of the large opening 503a is closer to the right end of the large opening 503a. Step part 5
Turn to 05. The stepped portion 505 is formed smaller than the large diameter portion 146a of the threaded portion 146 (in detail, the smaller opening 50 is smaller than the stepped portion 505).
3b is formed in a counterclockwise direction. ) Therefore, the large diameter portion 146 of the screw member 146
a comes into contact with the stepped portion 505, so that the connecting member 5 stops turning against the urging by the urging means 11 about the turning center axis 34. Therefore, the upper support frame 6 also stops its pivoting motion about the pivot center axis 34, and the upper support frame 6 is positioned at the first open position 6a. Since the large diameter portion 14 of the screw member 146 is configured accordingly, the large diameter portion 14 of the screw member 146
6a and a large opening 503a formed in the connecting member 5.
The first opening 6a cooperates with the stepped portion 505 at the left end to restrict the position of the upper support frame 6 to the first open position 6a.
It serves as a fixing means.

Next, when the upper support frame 6 is released further than the first open position 6a (the upper support frame 6 is released in the clockwise direction), the above-mentioned first fixing means is released and the attached It may be released by urging the urging means 11. The operating procedure will be explained below. First, in FIG. 5, the screw member 1
46 large diameter portion 146a and the arcuate opening 5 of the connecting member 5
In order to release the contact with the stepped portion 505 of 03, the screw member 146 is turned approximately half, and the small diameter portion 146b of the screw member 146 is inserted into the small opening 503 of the arcuate opening 503.
b. When the small diameter portion 146b and the small opening 503b are properly aligned, the small opening 503b of the arcuate opening 503 is guided by the small diameter portion 146b of the screw member 146 due to the biasing force of the biasing means 11, and the small diameter portion 503b of the screw member 146 is centered. It is rotated clockwise around the axis 34. Since they are configured accordingly, the small opening 503b of the connecting member 5 and the small diameter portion 146b of the screw member 146 serve as a first releasing means for releasing the first fixing means.

Therefore, by releasing the first fixing means by the above-mentioned first releasing means, the upper support frame 6 is also moved around the pivot center axis 34 by the urging means 11.
is biased clockwise by the biasing force of the second
As shown by the imaginary lines in FIG.
In the second open position 6b, the contact portions 602 formed at the right ends of the vertical front substrate 20 and the vertical rear substrate 22 of the upper support frame 6 touch the lower support frame. It comes into contact with an upright piece 403 erected at the right end of the vertical front substrate 8 and the vertical rear substrate 10 of the body 4 . (In FIGS. 3 and 5, the contact portion 602 formed at the right end of the vertical front substrate 20 of the upper support frame 6 and the lower support frame 4
An upright piece 40 is installed at the right end of the vertical front board 8.
Only 3 is shown. ) Correspondingly, the contact portions 602 formed at the right ends of the vertical front substrate 20 and the vertical rear substrate 22 of the upper support frame 6 contact the right ends of the vertical front substrate 8 and the vertical rear substrate 10 of the lower support frame 4. By contacting the upright piece 403 formed in the upper support frame 6, the second open position 6b is moved from the closed position to the upper support frame 6.
Since the position is rotated clockwise by an angle slightly greater than 90 degrees, the rotation centering axis 34 is rotated clockwise by the biasing means 11 and the weight of the upper support frame 6. The upper support frame 6 is moved against the moment into the second open position 6b shown in phantom in FIGS. 2 and 3. Therefore, the vertical front substrate 2 of the upper support frame 6
0, and the contact portion 602 formed at the right end of the vertical rear substrate 22, and the vertical front substrate 8 of the lower support frame 4.
An upright piece 403 formed at the right end of the vertical rear substrate 10 constitutes a second fixing means.

As described above, by positioning the upper support frame 6 in the second open position 6b using the second fixing means, the components near the pivot center axis 34 can be maintained and inspected extremely easily and quickly. . To further explain the procedure for assembling the copying machine main body 2, if the upper support frame 6 is positioned in the second open position 6b, which makes it possible to release most of the interior of the copying machine main body, the upper support When attaching components to the frame body 6 and the lower support frame body 4, the components can be attached extremely easily and reliably.

Although specific examples of a copying machine configured according to the present invention have been described above, the present invention is not limited to such specific examples, and various modifications and changes can be made without departing from the scope of the present invention. be.

For example, in the specific example, the biasing means 11 is constructed by combining a pair of substantially Z-shaped torsion bars 7 and 9, but instead of combining a pair of torsion bars, an upper support frame 6 and a lower support frame 4
Further, a compression coil spring or a helical spring is connected between the upper support frame 6 and the lower support frame 4 with the rotation axis as the rotation axis. Any suitable biasing means may be used as long as it applies a biasing force to the upper support frame 6 so as to bias the upper support frame 6 clockwise at the center.

In addition, in the specific example, the biasing means 11
The upper support frame 6 is biased clockwise around the pivot center axis 34, and the upper support frame 6 is moved to the first open position 6.
a to the second open position 6b, and
in the open position 6a, against the biasing force of the biasing means 11, and in the second open position 6b,
The upper support frame 6 is fixed by the first and second fixing means against the moment due to the biasing means 11 and the weight of the upper support frame 6.
and the second open position 6a, 6b, the biasing force by the biasing means 11 is applied to the upper support frame 6 so as to release the upper support frame 6 to the first open position 6a. Any device may be used as long as it is biased clockwise around the axis 34, and in this case, from the first open position 6a to the second
When releasing the upper support frame 6 to the open position 6b, after releasing the first fixing means, the upper support frame 6 whose urging force by the urging means 11 has already been reduced is manually moved to the second position. After pivoting to the open position 6b, positioning may be performed using the second fixing means.

In addition, in the specific example, the second
As shown in FIG. 2, the open position 6b of the open position 6b is fixed by being rotated by an angle slightly more than 90° from the closed position about the rotation center axis 34. In the specific example, the upper support frame 6 is moved to the second open position 6 by the biasing means 11.
a, and as described above, the second open position 6b is a position in which the upper support frame 6 is slightly more than 90 degrees from the closed position. ) The pivoting center axis 3 due to the biasing means 11 and the weight of the upper support frame 6
4, the second fixing means is actuated to position the upper support frame 6 in the second open position 6b against the moment in the clockwise direction about the upper support frame 6. positioning the second open position of the second opening position by the second fixing means, and
The opening angle of the second open position is not limited as long as it allows maintenance and inspection of the copying machine as required.

Furthermore, in the specific example, the pivot axis 34 when the upper support frame 6 is released from the closed position is
Although an example has been shown in which the axis of the biasing means 11 made up of the torsion bars 7 and 9 is the same, it is possible that the pivot center axis and the axis of the biasing means 11 made up of the torsion bars 7 and 9 are different. It's okay to be hot.

In the specific example, the first fixing means is a screw member 146 that resists the urging force of the urging means 11.
The large diameter portion 146a of the connecting member 5 and the step portion 505 of the connecting member 5
However, the biasing means 11 biases the upper support frame 6 in the clockwise direction so as to balance the moment due to the weight of the upper support frame 6 that biases the upper support frame 6 in the counterclockwise direction around the rotation center axis 34. It is also possible to configure

Furthermore, it is also possible to configure the biasing means 11 in such a way that the upper support frame 6 can be positioned at any desired release position.

Furthermore, in the specific example, the second fixing means is constituted by the contact portion 602 and the standing piece 403, but the small diameter portion 146b of the screw member 146 is connected to the arcuate opening 503.
It is also possible to fix the upper support frame 6 in the second open position 6b by making contact with the left end of the small opening 503b.

Furthermore, the first fixing means and the second fixing means are provided by a portion of the upper support frame 6 and the connecting member 5,
By coming into contact with a part of the lower support frame 4, the upper support frame 6 can be positioned and fixed in the first open position 6a and the second open position 6b.

Furthermore, in a specific example, when an original is scanned and exposed, the optical system is fixed and the original platen movable type copying machine, which is configured to move the original placing means configured to place the original, is used. Although an example has been shown, it goes without saying that this is also possible in a so-called moving optical system type copying machine, in which the document placing means for placing the document is fixed and the optical system is moved to scan and expose the document. stomach.

[Brief explanation of the drawing]

FIG. 1 is a simplified sectional view showing a specific example of a copying machine constructed according to the present invention. FIG. 2 is a diagram showing a state in which the upper support frame in the copying machine of FIG. 1 is released. FIG. 3 is a front view of a turning mechanism for turning the upper support frame from a closed position to an open position. Figure 4 is the third
A simplified sectional view seen from the direction of arrow A in the figure.
FIG. 5 is an exploded perspective view of the turning mechanism. 2...Copying machine housing, 3...Swivel mechanism, 4
... lower support frame, 5 ... connection member, 6 ... upper support frame, 6a ... first open position, 6b ... second
Open position, 7, 9...Torsion bar, 11...
Biasing means, 15... Locking means, 146... Screw member, 146a... Large diameter part, 146b... Small diameter part, 503... Arc-shaped opening, 503a... Large opening, 503b... Small opening, 505 ...Step section.

Claims (1)

[Scope of Claims] 1. Consists of a lower support frame and an upper support frame attached to the lower support frame so as to be pivotable between a closed position and an open position about a pivot center axis extending in the front-rear direction. In a shell type copying machine, a groove that is arranged coaxially with the rotation center axis, rotates as the upper support frame rotates, and has a wide groove and a narrow groove connected to each other via a stepped portion. A connecting member having: a long diameter portion inserted into the groove and having a diameter corresponding to the width of the wide groove; and a short diameter portion integrally having a diameter corresponding to the width of the narrow groove. a screw member; a biasing means that acts to rotate the upper support frame from a closed position to at least a first open position about the pivot axis; a locking means for positioning the support frame in a closed position; and a locking means for releasing the locking means and causing the long diameter portion of the screw member to abut against the stepped portion of the groove when the upper support frame is rotated by the biasing means. a first fixing means comprising the groove and a screw member, which restricts the rotation of the connecting member and positions the upper support frame in the first open position; a release means that allows rotation of the connecting member by inserting a part into the narrow groove, and a minor diameter of the screw member when the upper support frame is rotated about the central axis; The upper support frame is positioned at a second open position with a larger release angle than the first angular position by abutting the end of the narrow groove and the screw member. A shell-type copying machine comprising a second fixing means. 2. A shell-type copying machine according to claim 1, wherein the urging means is constituted by a combination of substantially Z-shaped torsion bars. 3. Claim 1, wherein the pivot center axis is the same as the axis of the biasing means.
A shell-type copying machine according to items 1 to 2.