JPH0374371B2 - - Google Patents

Description

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

The document pressure plate used in copying machines is used to press the plate onto the document table when the document is closed to improve the quality of the document, and also to make it easier to attach and remove the document on the document table. For this reason, it has become desirable for the opening/closing device for the document pressure plate to have both of these functions.

For this reason, a hard plate-like material was used for the manuscript pressure plate, which caused the problem that if the manuscript was thick like a book, it would be slanted when closed and the top surface could not be covered. .

To solve this problem, a device was developed in which an opening/closing device was mounted on a pair of support legs that were movably mounted on the cabinet.

However, this device had the problem that when the document pressure plate was opened and closed for a thick document, the force was not always evenly applied to the support legs, so the support legs could not move up and down smoothly. .

It is an object of the present invention to have a compact structure that allows a document to be pressed onto a document table in the closed state, to stably hold the document pressure plate at an intermediate opening angle for replacing the document, and to be able to hold thick documents. An object of the present invention is to provide a document pressure plate opening/closing device that can smoothly cover the top surface of the document pressure plate.

Still another object of the present invention is to provide an original pressing plate opening/closing device configured to be able to adjust the horizontal position of the original pressing plate with respect to the original placing table.

Embodiments of the present invention will be described in detail below with reference to the drawings.A mounting plate 3 is fixed to the upper surface of a cabinet 2 of a copying machine main body 1, and a pair of mounting plates 3 are provided upright from both sides of the mounting plate 3. The mounting pieces 4, 4 have mounting portions 6, 6 erected from both sides of the support plate 5.
One end thereof is hinged by hinge pins 7, 7. A mounting portion 8 having a substantially U-shaped plane is erected approximately in the center of the mounting plate 3, and a pair of mounting plates 9, 9 protruding from the substantially center portion of the support plate 5 are provided on both side plates 8a, 8a. One end thereof is pivotally attached by a hinge pin 10. Control pieces 3a, 3a for controlling the posture of the locking piece, which will be described later, are erected at positions slightly apart from both sides of the mounting portion 8, and the hinge pin 1
0 further includes a cam member 11 having a curved portion 11a.
is fixed in a non-rotating state. A pair of locking plates 12, 12 are further provided erected approximately in the center of the support plate 5 in the same direction as the mounting plates 9, 9. , each long hole 12
a, 12a and 9a, 9a are provided parallel to the support plate 5.

A sliding body 13 having a substantially U-shape in plan is housed between the mounting plates 9, 9 and the locking plates 12, 12.
3 are respectively locked in elongated holes 9a, 9a, 12a, 12a by engaging pins 14a, 14b passed through them, and are slidable back and forth. Between the ends of one of the engagement pins 14b that protrude through the elongated holes 12a, 12a and the ends of the hinge pin 10 that protrude through the side plates 8a, 8a of the mounting portion 8, Tension coil spring 15,
15 is stretched, and a cam pin 16 is pivotally mounted on the open end of the sliding body 13, and this cam pin 16 is placed in contact with the curved portion 11a of the cam member 11.

On both sides of the mounting plates 9, 9 provided on the support plate 5,
A pair of holding plates 17, 17, 18, 18 are erected on each side, and these holding plates 17, 17, 18, 1
Between 8 and 8, locking pieces 19 and 19 are connected to pins 20 and 20.
It is pivoted by. While torsion coil springs 21, 21 are wound around the pins 20, 20, a control pin 19 provided on the locking pieces 19, 19
a, 19a and the support plate 5.
From these locking pieces 19, 19, stopper pins 19b, 19b, 19b, 19b and locking pin 1 are further connected.
9c, 19c and 19c, 19c are provided in a protruding manner.

At the other end of the mounting portions 6, 6 provided on both ends of the support plate 5, mounting plates 22 provided on both ends of the adjustment plate 22 are attached.
a, 22a are pivoted by pins 23, 23, and the support plate 5 and the adjustment plate 22 are folded in a meandering manner and are folded over the mounting plate 3.

Storage holes 22b, 22b are provided at both ends of the adjustment plate 22.
are provided, and these storage holes 22bb, 22b
A pair of mounting plates 24, 24, 25, 2 are installed before and after the
5 are installed vertically. Of these, the mounting plate 24,
24 further has through holes 24a, 24a, and the other mounting plate 25, 25 has locking holes 25a, 25a.
25a, 25a are provided respectively. Mounting plate 2
4, 24, 25, 25 are fitted with sliding frames 26, 26 which are approximately U-shaped in plan view, and the open ends 26
a, 26a, 26a, 26a into the locking holes 25a, 2
5a, 25a, and 25a. The sliding frames 26, 26 are further provided with screw holes 26b, 26b, and the screw holes 26b, 26b have skirt portions 27,
Screws 28, 28 passing through engagement holes 27a, 27a provided in 27 are screwed. Further, the tips of the screws 28, 28 that have passed through the screw holes 26b, 26b have passed through the through holes 24a, 24a, and the compression coil springs 29, 29 are connected to the screws 28, 28,
It is elastically installed between the skirt portions 27, 27 and the sliding frames 26, 26 while being wrapped around the sleeve 28.

Inside the sliding frames 26, 26 are rocking bodies 30, 30.
are stored in the three inclined grooves (only 30a, 30b are shown) provided on the side surfaces of the sliding bodies 30, 30, pins 31, 31, 31 is engaged.

Then, the document pressure bonding plate 3 is attached to the swinging bodies 30, 30.
The rear end of 2 is fixed.

Now, in the closed state where the original pressure bonding plate 32 is closed, the support plate 5 and the adjustment plate 22 are folded in a meandering manner and overlapped on the mounting plate 3, and the cam pin 16 fixed to the tip of the sliding body 13 is a cam member. 11 curved part 1
1a, and is located below the axis of the hinge pin 10, the support plate 5 is urged to rotate clockwise by the traction force of the tension coil springs 15, 15, and is placed on the document table 33. The sheet-like original 34 is pressed toward the original pressing plate 32.

Basically, at this point, the sheet-like original 34 may be pressed onto the original mounting table 33 using only the own weight of the original pressing plate 32 without relying on the elasticity of the spring.

From this state, the handle 32 provided on the original pressure bonding plate 32
When the support plate 5 is lifted upward with the handle a, the support plate 5, together with the adjustment plate 22, rotates around the hinge pins 7, 7 and the hinge pin 10, and the original pressure bonding plate 32 is opened. At that time, the cam pin 16 first pulls the curved portion 11a of the cam member 11 and the coil springs 15, 15
It will rise slightly toward the top of the curved portion 11a against the pulling force of the curved portion 11a, so it will encounter some resistance. When the original pressing plate 32 is further opened, the cam pin 16 moves beyond the curved portion 11a of the cam member 11 toward its terminal end, and is stopped there.
Therefore, the original pressure bonding plate 32 is no longer opened.

When attempting to close the document pressure bonding plate 32 from this state, the cam pin 16
The document pressure bonding plate 3 must rise toward the top and slide the sliding body 13 against the pulling force of the tension coil springs 15, 15.
2 is for stably maintaining the self-supporting state at the intermediate opening angle. Therefore, in this self-standing state, the sheet-like original 34 on the original mounting table 33 can be replaced by removing the hand from the original pressing plate 32.

When the original pressing plate 32's handle 32a is pushed down by hand after replacing the original, the cam pin 1
6 must pull the curved portion 11a of the cam member 11 and rise toward the top against the pulling force of the coil springs 15, 15, so it encounters some resistance, but after that, the cam pin 16 pulls the curved portion 11a. As it slides toward the bottom, it is closed smoothly. When the cam pin 16 is closed to a certain extent, the cam pin 16 goes around to the bottom of the curved portion 11a, so the document pressure bonding plate 32 is biased in the closing direction, and the sheet-like document is firmly held. It will be crimped onto the mounting table 33.

Next, the function of the locking means for the adjustment plate 22 is to prevent light from leaking to the outside when the document is thick, such as a book, and to press it evenly onto the document table 33. It is for the purpose of
The locking pieces 19, 19 are always urged to rotate clockwise by the torsion coil springs 21, 21.
Stopper pins 19b, 19b, 19 whose rotation range is in contact with retaining plates 17, 17, 18, 18
b, 19b. Therefore, as shown in FIG.
c, 19c, 19c, 19c are locking pieces 22c protruding from the skirt portions 27, 27 side of the adjustment plate 22;
22c, the adjustment plate 22 is integrated with the support plate 5, and when closing the original pressure bonding plate 32, the adjustment plate 22 rotates around the pins 23, 23, and the original This does not make it difficult to close the crimp plate 32.

However, when the original pressure bonding plate is closed beyond a certain angle, the control pieces 3a, 3 protruding from the top of the mounting plate 3
a is the control pin 19a, 19 of the locking piece 19, 19
Coil spring 2 comes into contact with a and twists it.
1 and 21, the locking pieces 19 and 19 rotate counterclockwise, and the locking pins 1
Since the engagement between the locking pieces 32c and 22c and the locking pieces 32c and 22c is disengaged, the adjustment plate 22 can freely rotate in the clockwise direction opposite to the support plate 5. Therefore, even if the original is thick like a book, the original pressure bonding plate 32 becomes parallel to the original mounting table 33 according to the thickness of the book, as shown by the imaginary line in FIG. This allows the document to be evenly pressed onto the document table 33 while preventing the document from leaking out to the outside as much as possible. At this time, the support plate 5 that supports the original pressure bonding plate 32 always rotates around the fixed position relative to the mounting plate 3, so that the document pressure bonding plate 32 does not shift forward. be.

When the original pressure bonding plate 32 is opened beyond a certain angle, the control pieces 3a, 3a and the control pins 19 of the locking pieces 19, 19
a, 19a are separated, and the locking pieces 19, 19 are torsioned until the stopper pins 19b, 19b, 19b, 19b abut against the retaining plates 17, 17, 18, 18 due to the elasticity of the torsion coil springs 21, 21. It rotates counterclockwise, and the locking pins 19c, 19c engage with the locking pieces 22c, 22c of the adjustment plate 22 again.

Next, regarding the function of the oscillating bodies 30, 30 provided on the adjustment plate 22 to which the document pressure bonding plate 32 is directly attached, when the pins 28, 28 are turned alternately from side to side, the sliding body screwed thereon moves. The frames 26, 26 slide back and forth, thereby causing the pins 31, 31, 31.
31, 31, 31 move within three inclined grooves (only 30a, 30b are shown) provided in the rocking bodies 30, 30. Therefore, since the swinging bodies 30, 30 swing in the vertical direction, the document pressure bonding plate 3 attached thereto
Adjusting the parallel state to the document mounting table 33 of No. 2,
The pressure can be adjusted to make the pressure even.

As described above in detail, the device according to the present invention has a compact structure, can evenly press a document onto the document table in the closed state, and can also press the document pressure plate at an intermediate opening angle for replacing the document. After being stably held, the locking state of the adjustment plate that is pivoted to the support plate and attached with the original pressure bonding plate is released when the document pressure bonding plate is opened at a certain opening angle, so that the document pressure bonding plate is smoothly moved. It is capable of inverting and covering the upper surface of a thick original in parallel, and at that time, the original pressing plate does not shift forward and is always opened and closed in a fixed position. Furthermore, the oscillating body attached to the adjustment plate can provide effects such as being able to adjust the horizontal position of the original pressure bonding plate itself with respect to the original mounting table.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of a copying machine using the document pressure plate opening/closing device according to the present invention, FIG. 2 is an exploded perspective view of the same opening/closing device, and FIG. 3 is the same one. 4 is a sectional view taken along the line A-A of FIG. 3, and FIG. 5 is a sectional view taken along the line BB of FIG.
FIG. 6 is a side sectional view of the document pressure plate when it is opened, FIG. 7 is a side sectional view showing the operational relationship of the adjustment plate when the document pressure plate is closed when the document is thick, and FIG. FIG. 9 is a side cross-sectional view showing the locking relationship of the adjustment plate in the open state of the original pressure bonding plate; FIG. 9 is a cross-sectional view taken along the line CC in FIG.
The figure is D-D in Figure 3 showing a side cross section of the rocking plate.
The line sectional view and FIG. 11 are sectional views of the same side when the cutting position is changed. 2... Cabinet, 3... Mounting plate, 3a, 3
a... Control piece, 5... Support plate, 11... Cam member, 13... Sliding body, 15, 15... Tension coil spring, 19, 19... Locking piece, 19a, 1
9a... Control pin, 19b, 19b... Stopper pin, 19c, 19c... Locking pin, 21, 2
1...Torsion coil spring, 22...Adjustment plate, 22c, 22c...Locking piece, 26, 26...
Sliding frame, 30, 30... oscillator, 32... document pressure bonding plate, 33... document mounting table.

Claims (1)

[Scope of Claims] 1. A mounting plate to be attached to a cabinet, a support plate pivoted to the mounting plate so as to be able to open and close freely, and a pivot support of the support plate to the open end side of the support plate. An adjustment plate to be attached to the rear end of the original pressure bonding plate which is pivoted so that it can be opened and closed toward the side, a cam member attached to the mounting plate, and a cam member that is attached to the support plate so as to be able to move back and forth. a sliding body that is attached and has one end in contact with the cam member; a spring installed between the sliding body and the support plate for pressing the sliding body toward the cam member; and the adjusting member. a locking means for locking the plate at a certain opening angle or more according to the opening angle of the support plate, and releasing the locking at a certain opening angle or less; The structure is configured to create a state in which the document pressure bonding plate is pressed against the document mounting table and a state in which it is stably stopped and held in a self-supporting state at an intermediate opening angle due to a mutual effect with the elasticity of the spring, and
A locking piece in which the locking means is rotatably biased in one direction on the shaft support side of the support plate and pivoted thereon; The control piece is erected from the mounting plate side in order to rotate the locking piece against the rotational force, and the locking piece is locked and released depending on the rotational position of the locking piece. The adjustment plate is configured with a locking piece provided on the free end side of the adjustment plate, so that when the document placed on the document mounting table is thick, the adjustment plate can be opened to the opposite side from the support member. An original pressing plate opening/closing device, characterized in that the original pressing plate is configured to be held horizontally with respect to the original. 2. The adjusting plate is provided with a swinging body attached so as to be horizontally adjustable, and the document pressure bonding plate is attached to the adjusting plate so that its horizontal position can be adjusted via the swinging body. A document pressure plate opening/closing device according to claim 1.