JPH0374372B2 - - Google Patents

Description

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

This type of opening/closing device is desired to have a function of rotating and urging the document pressure plate in the closing direction in order to press the document placed on the document placement table within a certain opening angle range. It is desired to have a function of stably holding the document pressure plate at a predetermined opening angle in order to free both hands and facilitate the operation of attaching and detaching the document. In addition, if the original is thick like a book, there is a function that lifts the original pressing plate so that it is parallel to the original in order to prevent outside light from entering the optical system inside the copying machine. It is desired to have the following.

Since such various functions are required, the functions of the device inevitably become complicated and large-scale in order to satisfy all of them.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine document pressure plate opening/closing device that is inexpensive to manufacture by having the above-mentioned functions and making the structure as simple and compact as possible. .

One embodiment of the present invention will be described below in detail based on the drawings. As shown in FIG. It is attached to the top by a pair of hinges 4, 4 so that it can be opened and closed.
To explain in detail the structure of one of the hinges 4, as shown in FIGS. 2 to 5, the locking hole 5a provided on the mounting plate 5 fixed on the rear upper plate 3 A mounting member 6 having a generally U-shaped cross section is removably mounted via a mounting button 7. Both side plates 6 of this mounting member 6
On one side of a, 6a, a portion constituting the fixed end side of both side plates 8a, 8a of the first support member 8, which also serves as a spring case, is inserted through a caulking pin 9, which also serves as a hinge pin, with the free end facing forward. It is rotatably supported on the shaft. A cam member 10 made of an oil-impregnated resin made of polyacetal, for example, is attached to the center of the caulking pin 9, and side plates 8a, 8a of the first support member 8 that support the shaft of the caulking pin 9, for example, Metal bearing member 1
1 and 11 are fitted. Both side plates 6a, 6a of the mounting member 6 and both side plates 8a, 8 of the first support member 8
Pass the caulking pin 9 through the overlapping part of a,
For example, friction members 12, 12 such as fibers are inserted. By crimping one end of the crimping pin 9 with a constant crimping torque, a predetermined frictional force is created between the side plates 6a, 6a of the mounting member 6 and the side plates 8a, 8a of the first support member 8. It is starting to occur. The cam member 10 has a first cam part 13 and a second cam part 14 on its outer periphery, and can be mounted by inserting a fixing pin 15 axially mounted between both side plates 6a, 6a of the mounting member 6 in the axial direction. It is fixed to the member 6 and is configured not to rotate together with the first support member 8. Both side plates 8 of the first support member 8
A convexly bent control pin 16 is attached between a and 8a, and the convex portion of the control pin 16 is in contact with the first cam portion 13. The first support member 8 further includes mounting plates 8b, 8b bent from both side plates 8a, 8a, and a holding plate 8d bent from the base plate 8c between both side plates.
A slider 17 is slidably housed in between. On one side of this slider 17 is a pressure receiving pin 1.
8 is attached, and this pressure receiving pin 18 comes into contact with the convex second cam portion 14 of the cam member 10, and a compression coil spring 19 is elastically installed between this slider 17 and the holding plate 8d. . The slider 17 has grooves 17a, 17a on both sides, and the grooves 17a, 17a have a first support member 8.
Convex portions 8e, 8 protruding from both side plates 8a, 8a.
e is fitted.

The elastic means is a compression coil spring 1 elastically installed between the holding plate 8d of the first support member 8 and the mounting member 6.
As in the embodiment, the slider 17 is slidably housed in the first support member 8, and the slider 17 is configured to bias the slider 17 in one direction. It has a compression coil spring 19 elastically installed between the first support member 8 and the holding plate 8d, a pressure receiving pin 18 provided on one side of the slider 17, and a second cam portion 14 with which the pressure receiving pin 18 comes into contact. It may also be configured with a cam member 10 attached to the attachment member 6. others,
There are various known means.

Similarly, both side plates 8a and 8 are provided on one side of the holding plate 8d.
Projecting pieces 8f, 8f that are provided to project from a are in contact with each other. Furthermore, both side plates 8a, 8a of the first support member 8
On the free end side, both side plates 20b, 20b of the second support member 20 having the mounting plates 20a, 20a are attached to the hinge pin 21 with the free end side facing forward.
It is rotatably supported by.

The lock means for controlling the rotation of the second support member 20 is constructed as follows.

An arcuate hole 8 having the hinge pin 21 as the center point is provided on the free end side of both side plates 8a, 8a of the first support member 8.
g, 8g are formed. This arcuate hole 8g, 8
A stopper pin 22 attached to the free end side between the side plates 20a, 20a of the second support member 20 is inserted into both ends of the stopper pin 22 to restrict the rotation range of the second support member 20. Arc-shaped holes 8g, 8 provided on the free end sides of both side plates 8a, 8a of the first support member 8
Further, a locking member 23 is attached to a pin 24 on the outside of g.
This locking member 23 is always rotated clockwise by a torsion coil spring 25 that is elastically installed between the locking member 23 and one of the side plates 8a, 8a. Forced. This locking member 23 has a part connected to one end of an interlocking rod 26, and this interlocking rod 26 extends slidably toward the shaft support side of the first support member 8, and the other end is connected to the control pin 16. It is engaged. The base portion 1a of the document pressure bonding plate 1 is attached to the attachment plates 8b, 8b of the first support member 8, and the attachment plates 20a, 8b of the second support member 20 are attached to the attachment plates 8b, 8b of the first support member 8.
The cover portions 1b of the document pressure bonding plate 1 are fixed to each of the cover portions 20a.

Therefore, when the document pressure bonding plate 1 is currently closed, the pressure receiving pin 18 of the slider 17 is in contact with the starting end surface 14b of the second cam portion 14 of the cam member 10, and this starting end surface 14b is in contact with the other end surface 14b. Since it is located closer to the axis of the caulking pin 9 than the surface, the cam member 10 and the compression coil spring 19
The first support member 8 rotates and urges the original pressure bonding plate 1 in the closing direction via the holder 8, thereby pressing the original onto the original mounting table 2a.

Next, when opening the document pressure bonding plate 1 from this state, the stopper pin 22 of the second support member is in contact with the starting ends of the arcuate holes 8g, 8g, so the caulking pin 9 is moved together with the first support member 8. The cover portion 1b and the base portion 1a of the document pressure bonding plate 1 move together to be opened together. At this time, pressure receiving pin 1
8 slides on a portion of the second cam portion 14 that gradually becomes farther away from the axis of the caulking pin 9, and slides on the first support member 8.
The slider 17 also rotates clockwise.
is pushed and slid, and while compressing the compression coil spring 19, similarly rotates clockwise together with the first support member 8.

The control pin 16 is in contact with the first cam portion 13 of the cam member 10 until the document pressure plate 1 is opened approximately 45 degrees, and the sliding of the interlocking rod 26 is restrained. The member 23 does not rotate against the rotation urging force of the torsion coil spring 25, and does not move the tip of its rotating portion onto the rotation locus of the stopper pin 22 of the second support member 20. Therefore,
The second support member 20 freely rotates in the counterclockwise direction, that is, in the closing direction of the cover portion 1b, until the stopper pin 22 reaches the terminal end of the arcuate holes 8g, 8g. As a result, as shown in FIG. 6, for example,
When the original 27 is thick like a book, the cover portion 1b of the original pressing plate 1 rotates counterclockwise together with the second support member 20 to become parallel to the original 27, and external light is directed toward the main body of the copying machine. It is possible to prevent it from entering the internal optical system as much as possible.

When the opening angle of the document pressure bonding plate 1 exceeds 45 degrees, the control pin 16 will be further removed from the first cam portion 13.
The locking member 23, which is rotationally biased clockwise by the torsion coil spring 25, rotates,
The tip of the rotation is moved onto the rotation locus of the stopper pin 22 of the second support member 20, which is located at the starting end of the arcuate holes 8g, 8g at this time, and is locked. This prevents the second support member 20 from rotating counterclockwise. At this time, the lock member 23 stops rotating at a suitable position because the control pin 16, which is rotated clockwise via the interlocking rod 26 which is pulled leftward by the lock member 23, is rotated to the right position. This is because it falls into the recess 13a in the lower part of the first cam part 13 and is stopped.

Therefore, after the locking member 23 locks the stopper pin 22, the second support member 20 remains locked until the locking is released.
The original pressure bonding plate 1 does not rotate counterclockwise.
Only the cover portion 1b does not rotate.

As the original pressure bonding plate 1 is further opened, the slider 1 is at the open position of about 70 degrees, as shown in FIG.
The pressure receiving pin 18 of No. 7 is located in the recess 14a of the second cam portion 14.
When I was depressed and tried to close the original pressure plate 1,
Since the slider 17 must be pressed against the elasticity of the compression coil spring 19, the original pressure bonding plate 1 is stably held in this open position and will not fall by itself even if both hands are released. Therefore, the document can be replaced using both free hands.

In addition, in this state, the control pin 16 remains located below the first cam portion 13, so
Rotation of the locking member 23 remains blocked,
The second support member 20 does not rotate counterclockwise, and therefore the cover portion 1b of the document pressure bonding plate 1
The chisel will not rotate in the closing direction.

Next, when the document pressure bonding plate 1 is further opened from this state, the pressure receiving pin 18 moves on the surface of the second cam portion 14 that gradually approaches the axial direction of the caulking pin 9, so that the rotational torque of the document pressure bonding plate 1 is increased. is small and the elasticity of the compression coil spring 19 causes
The original pressure bonding plate 1 is automatically opened and stopped when one end of both side plates 8a, 89a of the first support member 8 abuts the fixing pin 15 at an opening angle of about 90 degrees. It will never be opened again.

Next, when the original pressure bonding plate 1 is closed from this state,
Since the second support member 20 is still maintained in the locked state, the pressure receiving pin 18 climbs the second cam part 14 while the cover part 1b and the base part 1a remain integrated, pushes the slider 17, and pushes the compression coil spring 19. It can be closed while compressing it slightly. At an opening angle of approximately 70°, the pressure receiving pin 18 falls into the recess 14a and is closed while encountering resistance when overcoming this, and when the opening angle approaches approximately 45°, the first cam portion 13 comes into contact with the control pin 16. Furthermore, by closing the document pressure bonding plate 1, the control pin 16 rides on the first cam portion 13 and rotates slightly clockwise, so that the interlocking rod whose one end is locked to the control pin 16 is rotated slightly. 26 slides to the right, and the lock member 23 connecting the other end is twisted counterclockwise against the elasticity of the coil spring 25. Then, the tip of the rotation moves away from the rotation trajectory of the stopper pin 22 of the second support member 20, and the locked state is released, so the second support member 20 moves counterclockwise within a limited range. It will be possible to rotate.

However, below this opening angle, the second support member 20 is rather rotationally biased in the closing direction, so that the base portion 1a of the document pressure bonding plate 1 and the cover portion 1
b is to be closed smoothly and to press the original onto the original placing table 2a.

The stable stopping angle of the document pressure bonding plate 1 and the locking/releasing position of the stopper pin 22 by the locking member 23 are determined by the recess 1 of the second cam portion 14, respectively.
By changing the position of 4a and the position and shape of the first cam part 13, it can be changed freely.

As explained in detail above, the present invention has a simple structure in which the original pressure bonding plate is divided into a cover part and a base part, and even if the cover part can be opened and closed with respect to the base part, there is no problem with the overall opening and closing operation of both parts. In addition to being able to press the original onto the original placing table without causing any trouble and stably holding the original pressing plate at a constant opening angle, it also prevents external light from entering even when the original is thick like a book. It is possible to achieve effects such as being able to prevent as much as possible from entering the optical system inside the copying machine main body and interfering with its functions.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of a copying machine embodying the invention, FIG. 2 is a side view of a hinge that constitutes the main part of the invention, and FIG. 3 is a plan view of the same. , FIG. 4 is an exploded perspective view of the same, and FIG.
The figure is a side sectional view to explain the closed state of the document pressure plate, Figure 6 is a side sectional view to explain the usage condition when the document is thick, and Figure 7 is the state where the document pressure plate is stably stopped and held. 8th sectional side view for explaining
The figure is a side sectional view for explaining a state in which the original pressure bonding plate is opened to the maximum angle. 1... Original pressure bonding plate, 2... Copying machine main body, 2a...
...Document placement table, 4, 4...Hinge, 6...Mounting member, 8...First support member, 9...Caulking pin, 1
0...Cam member, 13...First cam portion, 14...
Second cam portion, 16... Control pin, 17... Slider, 18... Pressure receiving pin, 19... Compression coil spring, 20... Second support member, 21... Hinge pin, 22... Stopper pin, 23... Lock member, 25...Torsion coil spring, 26
...Interlocking rod, 27...Manuscript.

Claims (1)

[Claims] 1. A mounting member attached to the main body of the copying machine;
A first support member that also serves as a spring case has a fixed end rotatably supported on both side plates of the mounting member with its free end facing forward; Document crimping comprising a second support member rotatably supported with its free end facing forward, a base attached to the first support member, and a cover attached to the second support member. a plate, an elastic means installed between the first support member and the attachment member for rotationally biasing the original pressure bonding plate in the opening direction and/or the closing direction, and rotation of the second support member. a stopper pin which is attached to the free end side of the second support member and rotates together with the second support member. , a lock member rotatably attached to the free end side of the first support member while being biased in one direction; and a lock member connected to the lock member at one end to the pivot side of the first support member. an interlocking rod that extends slidably; a control pin having a convex shape that is pivotally attached to the shaft support side of the first support member while locking the other end of the interlocking rod; and a control pin that abuts the control pin. A cam member fixed to the mounting member has a first cam portion for swinging, and the locking member is rotated through the control pin and the interlocking rod by the rotation angle of the first support member. rotate it,
An opening/closing device for a document pressure plate, characterized in that the device is configured to lock and release the stopper pin. 2. The elastic means includes a slider slidably housed in the first support member, and a coil elastically installed between the slider and the first support member to bias the slider in one direction. A patent claim characterized in that it is composed of a spring, a pressure receiving pin provided on one side of the slider, and a cam member attached to the mounting member side and having a second cam portion with which the pressure receiving pin comes into contact. The opening/closing device for a document pressure bonding plate according to item 1.