JP2002031863A - Document press-contacting plate opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the dragging of a thick original and to prevent a back cover from being damaged by reducing a rotational angle required for inverting a lifting member at the time of press-contacting the thick document as much as possible. SOLUTION: One end part of a supporting member 7 on a turning base end side is pivotally connected to be freely turnable through a hinge pin 6 to a mounting member 5. The lifting member 11 is pivotally connected to be freely turnable through a first supporting pin 9 and a second supporting pin 10. An actuating member 8 is integrally attached at the turning base end side of the lifting member 11. The actuating member 8 is provided with a perpendicular groove 19 into which the first supporting pin 9 is inserted and which is vertically long and a horizontal groove 20 into which the second supporting pin 10 is inserted and that is laterally long. A compression coil 24 for energizing the supporting member 7 is attached between the actuating member 8 and a position different from the pivotally connecting position of the mounting member 5 with the supporting member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a document pressing plate opening / closing device having a lift function, which is used for a copying machine, a printing machine, and the like, and is particularly preferably used for pressing a thick document.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 6-82649 discloses an apparatus for opening and closing a document pressing plate of this type. As shown in FIG. 5, the original cover pressing device includes a mounting member 5 attached to an apparatus main body 1 such as a copying machine, and one end of the mounting member 5 on both side plates via a hinge pin 6 so as to be rotatable. Support member 7 pivotally connected to
A lift member that overlaps the upper side of the support member 7 and is rotatably pivotally connected to the other end side of the support member 7 via a support pin 30 and is attached to the rotation base end side of the original cover 2. An operating pin member 31 attached between both side plates at a position where the lift member 11 pivotally connects to the support member 7 and pivots about the support pin 30 when the lift member 11 rotates, The support member 7 was urged in the opening direction of the original cover 2 between the operating pin member 31 and a position different from the pivotal connection position of the support member 7 on the mounting member 5 side, and the original cover 2 was attached. A compression coil spring 24 elastically provided so as to bias and hold the lift member 11 in a direction overlapping with the support member 7, and the lift member 11 is pivotally mounted on both side plates of the support member 7 with the support pin 30 as a fulcrum. Operating Notches to allow pivoting of the member 31 32
Is provided.

In this case, even if the original cover 2 is opened and the hand is released, the lift member 11 is pressed by the elastic force of the compression coil spring 24 in a direction in which the lift member 11 overlaps the support member 7. In this state, the original cover 2 can be maintained without being inverted. This compression coil spring 24
The pressing force against the lift member 11 by the
When the original is pressed down by hand when it is closed, the original cover 2 is maintained without being inverted. However, when the original is a thick original such as a book, a part of the original cover 2 contacts the thick original P. When a force is applied to the closing direction at the contact, the operating pin member 31 presses the compression coil spring 24, and the lift member 11 turns around the support pin 30 in the direction of arrow B against the elasticity of the compression coil spring 24. Then, the thick original P can be covered with the original pressing plate 2 substantially in parallel.

[0004]

However, in the document pressing plate opening / closing apparatus having the above-described structure, the lift member 11 is turned around the support pin 30 in the direction of the arrow B and lifted when the thick document P is pressed. When the reversal angle is large, the original cover 2 presses the thick original P against the apparatus main body 1 while pressing the thick original P.
In the direction toward the base end of rotation of the original cover 2 (in the direction of arrow A), thereby causing a positional shift of copying. As the reversal angle of the lift member 11 increases, the drag phenomenon of the thick document P in the direction of arrow A becomes more prominent. At this time, the protrusion 33 is provided at a predetermined position on the apparatus main body 1.
Is provided, the protrusion 33 restricts the dragging of the document P in the direction of arrow A. In this case, the spine Q of the thick document P is damaged by friction with the document pressure plate 2. The problem arises.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and the thickness of a thick original is reduced by minimizing the reversing angle of a lift member when pressing a thick original. An object of the present invention is to provide a document pressure plate opening / closing device capable of suppressing the dragging and copying misalignment and preventing the spine of a thick document from being damaged.

[0006]

According to the present invention, as shown in FIGS. 1 to 4, an attachment member 5 attached to the apparatus main body 1 and one end of the attachment member 5 on the rotation base end side. And a support member 7 pivotally connected in a vertically rotatable manner via a hinge pin 6, and is overlapped on the upper side of the support member 7, and the other end of the support member 7 on the rotation tip side is provided with a rotation base. The end side is pivotally connected in a vertically rotatable manner via two upper and lower first support pins 9 and second support pins 10 which are parallel to each other,
A lift member 11 attached to the rotation base end side of the original cover 2, a vertically elongated vertical groove 19 integrally attached to the rotation base end side of the lift member 11, and through which the first support pin 9 is inserted; An operating member 8 having a horizontally long horizontal groove 20 which is orthogonally communicated with the lower end of the vertical groove 19 and extends in the direction toward the rotation base end of the lift member 11 and through which the second support pin 10 is inserted; Between the operating member 8 and a position different from the pivotal connection position of the support member 7 of the mounting member 5, the support member 7 is urged in the opening direction of the original cover 2, and And a compression coil spring 24 mounted so as to urge the lift member 11 to which the pressure plate 2 is attached in a direction overlapping with the support member 7.

In this case, the lift member 11 is provided with both side plates 11b, 11b covering both sides of the support member 7, and the lift member 11 is provided on the rotation base end side of the both side plates.
An opening 21 into which both ends of the first support pin 9 and the second support pin 10 are loosely fitted can be formed so as to allow the lift member 11 to rotate during the rotation. The opening 21 may be formed in an L shape including a vertical groove 21a and a horizontal groove 21b that are substantially the same as the vertical groove and the horizontal groove of the operating member 8.

[0008]

In the normal state in which the original cover 2 is closed in a horizontal position, the first support pin 9 is located at the upper end of the operating member 8 in the vertical groove 19 and the second support pin 10 is located at the lower end of the vertical groove 19. In other words, they are located closer to one end in the direction of the lift member rotation distal end in the horizontal groove 20.

In this state, even if the original cover 2 is opened and the hand is released, the lift member 11 is pressed in the direction overlapping with the support member 7 by the elastic force of the compression coil spring 24. As in the case of the pressure plate opening / closing device, the document pressure plate 2 can be stably held in an open state, and
Without reversing the opened original cover 2,
Can be maintained.

The pressing force of the compression coil spring 24 against the lift member 11 is maintained without inverting the original cover 2 even if the original cover 2 is pressed down by hand when closing the original cover 2, but the original P is like a book. In the case of a thick original, when a part of the original cover 2 comes into contact with the thick original P and a force is applied in the closing direction, the lift member 11 presses the compression coil spring 24 with the operating member 8, First and second against the elasticity
The support pins 9 and 10 are turned around. This lift member 11
At the time of reversal, the operating member 8 is moved upward to slide the vertical groove 19 above the first support pin 9, and at the same time, the horizontal groove 20 is slid from the second support pin 10 toward the rotation tip side of the lift member 11. Inverts while drawing an elliptical trajectory by a combination with the horizontal movement. Due to the reversal of the lift member 11, the original cover 2 is lifted up at its rotation base end side so as to be substantially parallel to the thick original P, and the entire thick original is compressed on the apparatus main body with an even pressure distribution. Will do.

As described above, when the lift member 11 is turned over, the vertical groove 19 of the operating member 8 moves upward along the first support pin 9, so that the lift member 11 is set at a height corresponding to the thickness of the thick original P. The rotation angle required for reversing up to
As compared with the conventional reversing angle of the lift member required in the case of the conventional document pressing plate opening / closing device shown in FIG. 1, the vertical groove 19 of the operating member 8 needs to be as small as the upward movement along the first support pin 9. . Since the reversing angle of the lift member is small as described above, dragging of the thick original P in the direction of arrow A can be suppressed as much as possible, and damage to the spine Q can be prevented.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional side view showing the original cover opening / closing device according to the present invention in a fully closed state, FIG. 2 is a vertical sectional side view showing the original cover original plate opening / closing device of FIG. 1 in a thick original cover state, and FIG. FIG. 4 is an exploded perspective view of the document pressing plate opening / closing device shown in FIG. 1 in a state in which a thick document thicker than the thick document is pressed.

In FIG. 1, reference numeral 1 denotes an apparatus main body such as a copying machine;
Reference numeral 2 denotes a document pressure plate, and reference numeral 3 denotes a document pressure plate opening / closing device in which the document pressure plate 2 is attached to the apparatus main body 1 so as to be openable and closable vertically.

The original cover opening / closing device 3 includes a mounting member 5 mounted on the apparatus main body 1 with screws 4 and the like.
A support member 7 whose pivot base end is pivotally connected in a vertically rotatable manner via a hinge pin 6, and one end of the pivot base end side on the pivot tip side of the support member 7. Are upper and lower two first and second support pins 9 and 10 which are parallel to the operating member 8.
And a lift member 11 and the like, which are rotatably supported in a vertically rotatable manner, and which are attached to the rotation base end side of the original cover 2 with screws or the like (not shown).

As shown in FIG. 4, the mounting member 5 includes a metal bottom plate 5a which is mounted on the apparatus main body 1 with screws 4 or the like.
The bottom plate 5a is formed in a substantially groove shape in cross section having both side plates 5b, 5b rising from both ends thereof, and hinge pin pivotal support holes 12, 12 are provided at upper end sides of the both side plates 5b, 5b. Further, the hinge pin pivotal support holes 12, 1 in both side plates 5b, 5b.
Stopper pin support holes 13, 13 are provided below the document pressing plate 2 and at a position deviated toward the rotation tip side of the original cover 2.

As shown in FIG. 4, the supporting member 7 includes a metal upper plate 7a, two side plates 7b, 7b bent downward from both ends of the upper plate 7a, and two side plates 7b, 7b. It is formed in a groove shape with a lip in cross section having lips 7c, 7c bent inward and in parallel with the upper plate 7a.
7b is provided at one end on the rotation base end side with a hinge pin pivot support hole 14,1.
4 are provided, and first and second support pin pivotal support holes 15 and 16 are provided at the other end portions of the both side plates 7b and 7b on the rotation tip side. This support member 7 is provided with hinge pin pivotal support holes 1 of both side plates 7b, 7b.
The hinge pins 6 are inserted into the pivot holes 14 and 12 so that the hinge pins 4 and 14 are aligned with the hinge pin pivot holes 12 and 12 of the mounting member 5. It is connected. Stopper pins 17 are inserted into and fixed to the stopper pin support holes 13 of the both side plates 5 b of the mounting member 5 in parallel with the hinge pins 6.

As shown in FIG. 4, the lift member 11 includes a metal upper plate 11a attached to a rotating base end side of the original cover 2 with screws or the like (not shown), and a lower portion from both ends of the upper plate 11a. The side plates 1b are formed in a cross-sectional groove shape having both side plates 11b, 11b bent into two sides, as shown in FIG.
The operating member 8 is integrally connected and fixed between the members 1b and 11b with screws 18 or the like. The operating member 8 is formed of a polyacetal resin or a polyamide resin having excellent wear resistance.
A vertically elongated vertical groove 19 is provided in the vertical direction, and a horizontally elongated horizontal groove 20 is provided at the lower end of the vertical groove 19 so as to be orthogonal to the lower end of the vertical groove 19 and extend horizontally toward the rotation base end of the lift member 11. .

As shown in FIG. 1, the lift member 11 has an upper plate 11a above the upper plate 7a of the support member 7, and both side plates 11b, 11b
b, 7b, respectively, and the operating member 8
Are fitted between the side plates 7b, 7b on the pivoting distal side of the support member 7, and the first supporting pin pivots which are aligned with each other such that the pivoting distal end is directed toward the pivoting base end side of the original cover 2. The first support pin 9 is inserted through the support hole 15 and the vertical groove 19, and the second support pin 10 is inserted into the second support pin pivot support hole 16 and the horizontal groove 20, so that the first end of the support member 7 is rotated. ,
The two support pins 9 and 10 are pivotally connected so as to be rotatable vertically.

As shown in FIG. 4, the first support pin 9 and the first support pin 9 allow the rotation of the lift member 11 when the lift member 11 is rotated. 2 Opening 2 into which both ends of support pin 10 are loosely fitted
1, 21 are formed. Therefore, the lift member 1
Reference numeral 1 denotes a reinforcing side plate 11b, 11b without any hindrance of its rotation by the first and second support pins 9, 10.
To ensure strength. At this time, if the opening 21 is formed in an L shape composed of the vertical groove 21a and the horizontal groove 21b which are substantially the same as the vertical groove 19 and the horizontal groove 20 of the operating member 8, the opening area to the side plates 11b, 11b is made as small as possible. Therefore, it is more advantageous in securing reinforcement by the both side plates 11b, 11b of the lift member 11.

As shown in FIG. 1, both side plates 7 of the support member 7
A pair of cylindrical first and second sliders 22 and 23 formed of a polyacetal-based resin or a polyamide-based resin having excellent abrasion resistance are rotated on the lips 7c and 7c between the b and 7b. It is fitted slidably in the radial direction. Then, between the sliders 22 and 23 in the support member 7,
The lifting member 11 to which the original cover 2 is attached is supported by the supporting member 7.
A compression coil spring 24 that urges rotation in a direction overlapping with the compression coil spring 24 is interposed. The compression coil spring 24 is mounted between the stopper pin 17 and the operating member 8 via the first and second sliders 22 and 23 in the support member 7.

As shown in FIG. 1, a cam portion 25 that contacts the stopper pin 17 is formed on the back surface of the first slider 22. The cam portion 25 is formed to have a vertical surface 25a and a slope 25b provided below the vertical surface 25a. When the original cover 2 is fully closed in the horizontal position as shown in FIG. 1, the stopper pin 17 is in contact with the vertical surface 25a of the cam portion 25 of the first slider 22, and the vertical surface 25a is higher than the inclined surface 25b. Also stopper pin 17
Is located on the axis side of
5 and the compression coil spring 24, the supporting member 7 urges the original cover 2 to rotate in the closing direction. When the original cover 2 is opened from this state, the support member 7
At the same time, it is rotated around the hinge pin 6 and opened together. At this time, as shown in FIGS. 2 and 3, the stopper pin 17 slides on the slope 25 b of the cam portion 25, which is gradually farther from the axis of the stopper pin 17, and the first slider 22 is moved to the stopper pin 17 by the compression coil spring 24. The compression coil spring 24 is slightly extended by being pushed in the approaching direction and sliding.

Next, the operation of the document pressure plate opening / closing device having the above configuration will be described. FIG. 1 shows a state in which the original cover 2 is fully closed in a horizontal posture. In this state, the compression coil spring 24 is in a compressed state, the first support pin 9 is at the upper end in the vertical groove 19, and the second support pin 10 is at the lower end in the vertical groove 20, that is, the lift in the horizontal groove 20. It is located near one end in the direction of the member rotation tip.

When the original is pressed against a thin original such as paper, the original cover 2 is fully opened and closed by the elastic force of the compression coil spring 24 interposed between the lift member 11 and the mounting member 5. It is operated without reversing over the stroke, and a predetermined opening angle is obtained by the elastic force of the compression coil spring 24 acting on the support member 7 via the slider 22 and the lift member 11, which contact the stopper pin 17 with the slope 25 b of the cam portion 26. And is stopped and held stably.

As shown in FIG. 2, when the original P is a thick original such as a book, the original cover 2 is closed and a part thereof is applied to the thick original P, so that the original close When the side is pressed slightly downward, the lift member 11 presses the compression coil spring 24 by the operating member 8 via the slider 23, and the first and second support pins 9 and 10 are viewed around the arrow B against the elasticity thereof. The document pressing plate 2 is lifted up at its rotation base end side to be parallel to the upper portion of the thick document P, and presses the entire thick document P on the apparatus main body 1 with uniform pressure. .

The lift member 11 includes first and second support pins 9, 1.
When turning around 0, the operating member 8 together with the lift member 11 makes the vertical groove 19 above the first support pin 9 (in the direction of the arrow Y).
And the horizontal movement of sliding the horizontal groove 20 from the second support pin 10 in the direction X toward the tip of the rotation of the lift member 11 at the same time. In the case where a thick original P ′ thicker than the thick original P shown in FIG. 2 is pressed, as shown in FIG.
When the lift member 11 is turned over, the vertical groove 19 of the operating member 8 moves further upward in the Y direction than the first support pin 9 and the horizontal groove 20 moves.
Moves horizontally further in the direction X of the lift member rotation tip side than the second support pin 10.

As described above, when the lift member 11 is connected to the thick original P,
The vertical groove 19 of the operating member 8 moves upward along the first support pin 9 together with the lift member 11 when the lift is inverted and lifted to a height corresponding to the thickness of P ′. 11 can be reduced. Since the reversing angle of the lift member 11 is small, it is possible for the document pressing plate 2 to drag the thick document P or P 'in the direction A of the rotation base end side as the lift member 11 is reversed. Can be suppressed. Therefore, it is possible to prevent the copy position from being shifted, and to prevent the spine Q from being damaged if the drag prevention projection 33 is provided.

[0027]

According to the present invention, since the reversing angle of the lift member is required to be as small as possible when the thick original is pressed, the dragging of the thick original and the positional deviation of copying can be suppressed. Advantageously, damage to the spine can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a document pressing plate opening / closing device according to the present invention in a fully closed state.

FIG. 2 is a longitudinal sectional side view showing the original document pressing plate opening / closing device of FIG. 1 in a state where a thick original document is pressed.

FIG. 3 is a longitudinal sectional side view showing a thick document thicker than the thick document in FIG. 2 in a pressed state.

FIG. 4 is an exploded perspective view of the original cover pressing device of FIG. 1;

FIG. 5 is a vertical sectional side view showing a conventional document pressing plate opening / closing device in a thick document pressing state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 2 Original pressure plate 3 Original pressure plate opening / closing device 5 Mounting member 6 Hinge pin 7 Support member 8 Operating member 9 First support pin 10 Second support pin 11 Lift members 11b, 11b Both side plates of a lift member 19 Vertical groove 20 Horizontal Groove 21 Opening 21a Vertical groove of opening 21b Horizontal groove of opening 24 Compression coil spring

Claims (3)

[Claims] An attachment member attached to the main body of the apparatus, a support member having one end on a rotation base end side pivotally connected to the attachment member via a hinge pin so as to be rotatable in a vertical direction; The upper end of the support member overlaps with the upper end of the support member, and the other end of the upper end of the support member is rotated in the vertical direction through two upper and lower first and second support pins whose rotation base ends are parallel to each other. A lift member freely pivotally connected and attached to the rotation base end side of the original cover, and integrally attached to the rotation base end side of the lift member;
A vertically elongated vertical groove through which the first support pin is inserted, and a horizontally elongated vertical groove which extends perpendicularly to a lower end of the vertical groove and extends in a direction toward the rotation base end of the lift member, and into which the second support pin is inserted. An actuating member having a horizontal groove, and between the actuating member and a position different from the pivotal connection position of the supporting member of the mounting member, urging the support member in the opening direction of the original cover. And a compression coil spring mounted to urge the lift member to which the original cover is attached in a direction overlapping the support member. 2. The lift member includes two side plates that cover both sides of the support member, and a rotation base end of the both side plates is configured to allow the lift member to rotate when the lift member rotates. 2. The original cover opening and closing device according to claim 1, wherein an opening into which both ends of the first support pin and the second support pin are loosely fitted is formed. 3. The document pressing plate opening / closing device according to claim 2, wherein the opening is formed in an L-shape including substantially the same vertical and horizontal grooves as the operating member.