JPH0418287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document pressure plate opening/closing device in, for example, a copying machine.

Conventionally, in this type of opening/closing device for a document pressure plate, the document pressure plate is at an acute angle with respect to the contact glass immediately before closing, so that the document placed on the contact glass is pushed and the placement position is changed. There are problems such as misalignment, distortion, or wrinkles, and these problems are compounded when the original is thick, resulting in a flaw that the copy is likely to be unclear and misaligned.

This invention primarily solves this problem, and its purpose is to provide an original pressing plate in a copying machine which is configured so that the original pressing plate falls horizontally onto the contact glass immediately before the lid is closed. There is no need to provide a switchgear.

The present invention will be described in detail below based on an embodiment shown in the drawings. On the rear upper plate a of the main body A of the copying machine, a mounting member 1 having both side plates 1a, 1a is mounted with mounting screws 2a, 2b. It is fixed by. Incidentally, this attachment member 1 may be detachably attached using an attachment button or other known means. Moreover, this mounting member 1 may be constructed integrally with the upper plate a. This mounting member 1
A spring receiving member 3 having both side plates 3a, 3a is fixed to the upper surface of one side by a rivet 4, and a spring receiving member 3 is fixed to the upper surface of one side by a rivet 4, and a spring receiving member 3 is fixed to the upper surface of one side by a rivet 4, and a spring receiving member 3 is fixed to the upper surface of the spring receiving member 3 by a rivet 4. A supporting member 7 has its side plates 7a, 7a pivotally attached to the bearing members 5, 5 fixed in this manner through a hinge pin 6. The hinge pin 6 is fitted into the cylindrical body 8,
A pair of torsion coil springs 9, 9 wound around this cylinder 8 have respective ends 9a, 9b, 9a,
9b is the side plate 7a, 7 of the mounting member 1 and the support member 7.
The support member 7 is constantly urged to rotate clockwise by contacting the support member 7 with a stopper pin 10 that is axially mounted between the support members 7a and 10a.

Bearing members 5, 5 and supporting member 7 side plates 7a, 7
A friction member 1 such as a fiber is provided between the
1 and 11 are interposed with the hinge pin 6 inserted through the center thereof, and a spring washer 12 is inserted between the head 6a of the hinge pin 6 and one side plate 7a through the center of which the hinge pin 6 is inserted. The hinge pin 6
By caulking the tail portion 6b of the friction member 1
A predetermined frictional force is generated on both sides of 1 and 11.

A pair of wing pieces 1 are provided approximately at the center of one side of the support member 7.
3 and 13 are vertically installed at a predetermined interval, and support pins 14 are pivoted in elongated holes 13a, 13a provided in the wing pieces 13, 13, and support pins 14 are provided in both side plates 3a, 3a of the spring receiving member 3. Cylinder portions 16a, 16a and cylinder portions 16a, 16 are arranged alternately between the support pins 15 which are pivoted in the elongated holes 3b, 3b.
Spring control members 16, 16 provided with support rods 16b, 16b inserted into the recess 16
c, 16c are interposed against each other, and between the spring control members 16, 16, the cylinder portions 16a, 16a and the support rod 1 are interposed.
Compression coil springs 17, 17 are elastically installed while 6b, 16b are inserted in the central axial direction.

Bearing members 18, 18 are attached to both side plates 7a, 7a of the support member 7 by hinge pins 6 so as to be located on the opposite side to the shaft support side and not rotate. Both side plates 20a, 20a of the control member 20 are pivoted through the pin 19, and the head 19a of the pin 19 is brought into contact with a protrusion 20b protruding from the side plate 20a in one direction. The control member 20, which is configured to rotate, may be configured integrally with the document pressure bonding plate B.

The support member 7 further includes a control pin 21 on the pin 19 side but at a different pivot point.
By abutting against a protrusion 20c protruding from the side plate 20a, it is mounted so that it does not rotate. This control pin 21 has a first
Arm members 22, 22 are pivotally connected, and a second arm member whose one end is pivotally connected to both side plates of the mounting member 1 by pins 23, 23 is provided on the free end side of the first arm members 22, 22. 24, the free end of 24 is pin 2
4a, 24a, and constitute so-called crank means 25, 25. A pair of torsion coil springs 26, 26 are wound around the pin 19 and elastically installed between the control pin 21 and the support pin 14, thereby rotating the control member 20 in a direction overlapping the support member. It's energizing. and,
The rear portion of the document pressure bonding plate B is fixed to the control member 20.

Now, with the document pressure bonding plate B closed, the first
As shown in the figure, the support member 7 and the control member 20 are in a mutually folded state with respect to the mounting member 1, and in this state, in particular, the support member 7 and the control member 20 are twisted as shown in FIGS. Coil spring 9,9
(only one side shown), and compression coil spring 1
The total elasticity of 7 and 17 (the same applies below where only one is shown) is inferior to the weight of original pressure bonding plate B, and
The crank means 25, 25 (only one shown) pulls the control pin 21 of the control member 20 clockwise, and the torsion coil springs 26, 26 (only one shown) also pull the control pin 21 of the control member 20 through the control pin 21. Since the document pressing plate B is rotated clockwise in the direction in which it overlaps with the support member 7, the document pressing plate B maintains a stable closed state and presses the document onto the contact glass 27 by its own weight. Of course, at this point, the original pressing plate B may be pressed onto the contact glass 27 by directing the direction of action of the elastic force of the compression coil springs 17, 17 downward. Further, in the above-described state, the compression coil springs 17, 17 are in a maximum compressed state, but their elasticity hardly acts in the direction of opening the document pressure bonding plate B.

Next, when the original pressure bonding plate B is opened from this state, since the control member 20 is in contact with the back of the support member 7, the document pressure bonding plate B is pressed against the hinge pin 6 of the support member 7.
The support member 7 and the control member 20 are rotated clockwise around the pivot position as the fulcrum, and as shown in FIGS.
It opens as shown. As this document pressure bonding plate B is opened, the spring control members 16, 16
At the same time, the direction of action of the compression coil springs 17, 17, which rotate clockwise, changes to push the support member 7 in the opening direction, and this elasticity is combined with the elasticity of the torsion coil springs 9, 9 to rotate the original. Since it acts in the direction of reducing the weight of the pressure bonding plate B, the document pressure bonding plate B can be opened without significantly reducing its weight, and the weight of the document pressure bonding plate B, that is, the opening angle, is constantly changing. Even if the hand is released from the document pressure bonding plate B when the torque that changes and the elasticity that acts in a direction to cancel this balance are balanced, the document will stop in a slightly reversed state as described later and will not fall naturally. This allowable stop range is determined by interposing the friction members 11, 11 and the spring washer 12 at the pivot point of the mounting member 1 and the support member 7, that is, at the position of the hinge pin 6, and by caulking the tail portion 6b of the hinge pin 6. This is due to the frictional force caused by this.

When the original pressure bonding plate B is further opened, the elasticity (torque) of the torsion coil springs 9, 9 and the elasticity of the compression coil springs 17, 17 gradually weaken, but they still outweigh the rotational torque of the document pressure bonding plate B. Since the original pressing plate B is opened naturally, the stopper pin 10 comes into contact with the edges of the side plates 1a and 1a of the mounting member 1 at an opening angle of about 75 degrees as shown in FIGS. 7 and 8. stop by.

Even if it does not open to this maximum opening angle, there is no problem in using it, and if you release your hand within the opening angle range of approximately 35° to 60°,
As described above, the original pressure bonding plate B is stopped in a slightly inverted state together with the control member 20 against the elasticity of the torsion coil springs 26, 26, and this inversion angle is determined by each crank means at the opening angle of the document pressure bonding plate B. 2
5, 25 constitute the first and second arm members 2
Control pin 2 that pivotally supports 2, 22, 24, 24, respectively.
1 and the pins 23, 23.

This reversal of the document pressure bonding plate B also occurs when the document pressure bonding plate B is closed when it is opened to the maximum angle.

When the opened document pressure bonding plate B is closed, the document pressure bonding plate B is slightly inverted as described above, and the crank means 25, 25 are used to torsion the coil springs 9, 9 while changing the inversion angle moment by moment. The crank means 2 is closed against the elasticity of the compression coil springs 17, 17, and the original pressing plate B is approximately parallel to the contact glass 27.
5 and 25 and the torsion coil springs 26 and 26, the document pressure bonding plate B falls and closes while maintaining a state parallel to the contact glass 27.

Therefore, since the original on the contact glass 27 is subjected to surface pressure horizontally from above and below, there is no need to worry about the original being shifted or wrinkled as in the conventional case.

Furthermore, even if the original is thick like the book 28, the reversed original pressing plate B will cover the upper surface of the book 28 in the ninth position.
As shown in FIGS. 10 to 10, since the cover can be covered substantially horizontally, leakage of exposure light to the outside or intrusion of outside light into the interior of the machine can be prevented as much as possible.

In this invention, what ensures the horizontal fall of the original pressure bonding plate B against the contact glass is the mutual effect of the crank means 25, 25 and the torsion coil springs 26, 26, as described above. That is, depending on the opening angle of the original pressure bonding plate B, the pivot positions of the first arm members 22, 22 of the crank means 25, 25 relative to the control pin 21, and the second arm member 24,
Since the distance between the shaft support positions by the pins 23 and 23 of 24 changes, the crank means 25,
Reference numeral 25 changes the inversion angle of the document pressure bonding plate B by rotating the control member 20 about the pin 19 as a fulcrum. Therefore, even without the torsion coil springs 26, 26, the crank means 2
By controlling the movements of 5 and 25 more accurately, it becomes possible to horizontally drop the original pressure bonding plate B. The springs 26, 26 are used to assist the smooth movement of the crank means 25, 25.

Moreover, this invention also provides a torsion coil spring 2.
Even if only 6 and 26 are used, it is possible to cause the document pressure bonding plate B to fall horizontally depending on which one is used.

Furthermore, the torsion coil springs 9, 9 that rotationally bias the support member 2 are compression coil springs 1.
If elastic materials are used for 7 and 17, they may be omitted.

As explained in detail above, according to the present invention, the document pressure plate can be dropped horizontally with a simple configuration, so that the position of the document placed on the contact glass does not shift when the document pressure plate is closed. , it is possible to achieve the effect of being able to prevent wrinkles as much as possible.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view thereof, FIG. 2 is a partially sectional plan view of the same, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG. 5 is a sectional view taken along the line B-B in the figure, with the document pressure plate opened at an intermediate opening angle, and the cut point is placed at the third position.
6 is a side sectional view corresponding to the cut point in FIG. 5, and FIG. 7 is a side sectional view corresponding to the cut point in FIG. Fig. 8 is a side sectional view corresponding to Fig. 3, Fig. 8 is a side sectional view of the cut point in Fig. 7 corresponding to Fig. 4, and Fig. 9 is a side sectional view of the case where the manuscript is thick like a book. A side view; FIG. 10 is a side sectional view of the cut point in FIG. 9 corresponding to FIG. 3;
FIG. 11 is an exploded perspective view. A... Copying machine body, B... Original pressure bonding plate, 1...
Mounting member, 6... Hinge pin, 7... Support member,
9,9...Torsion coil spring, 10...Stopper pin, 17,17...Compression coil spring, 19...Pin, 20...Control member, 21...
...Control pin, 25, 25...Crank means, 2
2, 22...First arm member, 23, 23... Pin, 24, 24... Second arm member, 24a, 2
4a...Pin.

Claims (1)

[Claims] 1. A mounting member is attached to the main body of the copying machine, and a supporting member is provided on the mounting member via a hinge pin so as to rotate in the same direction as the opening/closing direction of the document pressure plate, and the supporting member and the mounting member are connected to each other. providing an elastic means for biasing the support member in the opening direction between the two;
A control member is pivotally attached to the free end side of the support member via a pin so as to rotate in a direction opposite to the support member, a document pressure bonding plate is attached to the control member, and a pressure bonding plate is attached to the control member, and a control member is provided between the support member and the control member. an elastic means for rotationally biasing the control member in a direction overlapping with the support member, and one end of the control member is pivoted between the control member and the mounting member at a position different from the pin of the control member. and a second arm member having one end pivoted to the free end side of the first arm member and the other end pivoted to a position different from the hinge pin of the mounting member. and the crank means reverses the control member against the elasticity of the elastic means when the document pressure plate is closed, so that the document pressure plate falls horizontally onto the contact glass. An opening/closing device for the original pressure bonding plate.