JP3406558B2 - Opening / closing device for original cover - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift-up type document pressure plate opening / closing device used in a copying machine, a printing machine or the like.

[0002]

2. Description of the Related Art Conventionally, in order to properly cover a thick original manuscript such as a dictionary or a picture book, the original crimping plate is lifted while the rear end of the crimping plate is lifted. A lift-up type document pressing plate opening / closing device is known in which the front end portion can be swung downward. And
As such a lift-up type opening / closing device, a base member that can be attached to the upper surface of a document placing table, a base end portion of which is pivotally attached to the base member while being urged upward, and a document pressure plate is provided. An oscillating member that can be attached and a columnar support leg protruding downward from the lower surface of the base member are provided, and the support leg is slid into a vertical insertion hole provided on the upper surface of the document table. There is a type in which the base member itself is lifted up by freely inserting it (for example, Japanese Utility Model Publication No. 4-28094, Japanese Utility Model Publication No. 2).
-49338 gazette).

However, in the case of the type in which the supporting leg is inserted into the insertion hole on the side of the original placing table to lift up the base member, the supporting leg is always kneaded inside the insertion hole by the reaction force in the front-rear direction received from the base member. Since it is in the state, the outer peripheral surface of the support leg is in contact with the inner wall of the insertion hole with a considerably large frictional force, and it is difficult to slide. Therefore, especially in the case of a heavy original pressure plate having an automatic document feeding function, there is a drawback that it is very difficult to lift up the pressure plate. Therefore, a lift member is further pivotally attached to the tip of the swing member so as to overlap with the upper surface of the swing member, and a document pressure plate is attached to this lift member, so that the base member itself is not vertically moved to bond the document. An opening / closing device that lifts up a plate has already been proposed (see Utility Model Registration No. 2598506 (hereinafter, this publication is referred to as a conventional publication)).

That is, in the conventional opening / closing device, a base member which can be mounted on the upper surface of the document placing table, a swinging member whose base end is swingably swingable up and down, and a swinging member. A lift member pivotally attached to the front end of the member so as to overlap with the upper surface of the member and to which a document crimping plate covering the document placing table from above can be attached, and a state in which the lifting member is stretched to the outside in the longitudinal direction inside the swinging member. A biasing member having a base-side first cam portion for biasing the swinging member upward and a tip-side second cam portion for biasing the lift member in a direction overlapping the swinging member. And ,.

[0005]

SUMMARY OF THE INVENTION In the opening / closing device described in the above publication, a pressed portion for contacting the second cam portion of the biasing member to bias the lift member toward the swinging member (conventional). Since the "actuating member 11" referred to in the gazette is constituted by a shaft that is installed so as to extend between the left and right side plates of the lift member, the pivoting of the shaft is allowed at the tip end portions of the side plate of the swinging member. A notch for escape is formed for this purpose (see [Claim 1] of [Claims] in the conventional publication (column 2, lines 2 and 3 of the publication)).

As described above, in the opening / closing device disclosed in the conventional publication, it is necessary to form a notch for escaping the shaft at the tip of both side plates of the rocking member. Since the shape becomes complicated and the manufacturing cost of the switchgear increases, the supporting strength of the tip of the swinging member cannot be secured unless the plate thickness itself is considerably thick. It has the drawback of high material costs. On the other hand, the opening and closing described in the above-mentioned conventional publication
In the device, the base member is a mounting plate for the document table.
The fixed base (mounting member 4) and the fixed base
A lift car that is fixed and contacts the first cam part of the biasing member.
And a cam member having a cam surface (cam member 8)
Both of these members have two pins that penetrate them together.
Are integrated with each other.

However, as described above, the cam member and the fixed base are
Both of them are integrated by penetrating the base with two pins.
And the fixed base is shaped according to changes in the specifications of the document table.
If you need to replace it with another fixed base of different
Just remove the two pins and replace the fixed base.
, It is necessary to insert the two pins again,
There is a drawback that the replacement work of the source is very troublesome.
INDUSTRIAL APPLICABILITY The present invention makes it extremely easy to replace a fixed base.
The purpose is to do so.

Further , according to the present invention, in a document pressing plate opening / closing device which can lift up a document pressing plate without vertically moving a base member, the lift member can be lifted without forming a notch at the tip of the swinging member. So that it can be biased toward the rocking member,
The purpose is to reduce the manufacturing cost and material cost of the switchgear.

[0009]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention provides a base member that can be attached to the upper surface of the document table.
The base end is pivotally attached to this base member so that it can swing up and down.
The rocking member and the upper surface of the rocking member so that they overlap.
Is attached to the front end of the same member, and
A lift member to which the original cover plate can be attached,
It fits inside the swinging member in a state of being stretched outward in the longitudinal direction.
The first end on the base side that has been housed and urges this rocking member upward.
The cam portion and the lift member in the direction in which they overlap the swing member.
A biasing member having a second cam portion on the tip side for biasing,
The base member is a mounting plate for the upper surface of the document table.
And a fixed base that has a
Lift cam that is fixed and contacts the first cam portion of the biasing member
A cam member having a surface, and the cam member
Has bosses protruding from the left and right sides of the boss.
Swinging Sha for pivotally swinging member so that penetrations of parts
And the fixed base is attached to the left and right of the mounting plate.
It has supporting side walls on both sides, and the rocking motion is performed with respect to this supporting side wall.
Support where the boss is fitted without inserting the shaft
It is characterized in that a recess is formed .

In this case, the swing shaft is fixed to the fixed base.
Since it is inserted only in the cam member and not in the
The fixed base can be removed from the cam member without removing the shaft.
It can be removed, which allows you to change the specifications of the document table.
The replacement work of the fixed base can be done very easily.
The present invention is characterized in that a hanging wall extending downward is formed at a tip end portion of the lift member, and a pressed portion with which the second cam portion of the biasing member abuts is formed on the hanging wall.

In this case, since the pressed portion with which the second cam portion of the biasing member abuts is formed on the hanging wall extending downward at the tip of the lift member, the pressed portion is formed on both left and right sides of the lift member. It can be placed separately from the board,
For this reason, the lift member can be biased toward the swinging member side without forming a relief notch for allowing the pressed portion to swivel at the tip end portion of the swinging member. Therefore, the shape of the tip portion of the rocking member can be simplified in that it is not necessary to form the notch, and the manufacturing cost of the switchgear can be reduced in this respect. Further, since it is not necessary to form the notch in the swing member, it is possible to effectively secure the support strength of the swing member without increasing the plate thickness itself of the swing member. The material cost of the switchgear can be reduced.

In the opening / closing device of the present invention described above, the pressed portion may be formed by bending the hanging wall itself (see FIG. 1), or the hanging wall as a separate body from the hanging wall. Although it can be constituted by a pressed body fixed to the inner surface side of the (see Fig. 6), the former is preferable in that the number of parts can be further reduced and the structure of the tip portion of the lift member becomes simpler. Further, in the former case, if the pressed portion is formed by curling the lower end of the hanging wall toward the inside, the contact surface of the pressed portion with respect to the second cam portion is curved. Since it becomes a surface, sliding of the pressed part with respect to the second cam part becomes smooth, wear of the second cam part can be reduced as much as possible, and the pressing part bent and formed in the curl shape makes the hanging wall Ru can be the flexural strength increases.

On the other hand , a cam member having a lift cam surface with which the first cam portion of the biasing member for biasing the swinging member abuts is provided on a base member attachable to the upper surface of the document table. In the opening / closing device, it is necessary to apply lubricating grease to the lift cam surface in order to make the first cam portion slide smoothly on the lift cam surface. However, in the past, since the lift cam surface was processed to be a smooth smooth surface, the lubricating grease gradually scraped up and down on both sides of the lift cam surface by the first cam portion while the rocking member repeatedly rocked up and down. May be

When such a scraping phenomenon occurs, the lubricity of the central portion of the lift cam surface gradually decreases, noise is generated due to the sliding of the first cam portion, and the collected lubricating grease is accumulated. When copying, etc., it sometimes adhered to the manuscript and the user's clothes and made them dirty. Therefore, the present invention provides an opening / closing device including a cam member having a lift cam surface with which the first cam portion abuts, and a function of retaining lubricating grease on the lift cam surface, the abutment surface of the first cam portion, or both of them. It is recommended to have the fine unevenness processing that it has.

In this case, since the lift cam surface (or the first cam portion) is subjected to the fine concavo-convex processing having the function of retaining the lubricating grease, even if the rocking member repeatedly rocks up and down,
Lubricating grease is prevented from being scraped up and down both sides of the lift cam surface. Therefore, it is possible to prevent noise from being generated due to a decrease in the degree of lubrication, and it is possible to effectively prevent a pool of lubricating grease from adhering to a document or clothes. Further, especially in the case of a document pressure plate having an automatic document feeding function, since static electricity generated at the time of document feeding may cause a malfunction in electrical control, a reliable grounding measure is required. Therefore, a means for connecting the swinging member and the base member with an earth cord made of a metal wire having good conductivity was adopted, but this requires both terminals of the earth cord to be screwed to both members. The manufacturing cost was high, and the earth cord was sometimes broken due to repeated opening and closing operations of the hinge.

Therefore, in the present invention, by providing a ground member having a spring force with excellent conductivity, one end of which is fixed to one of the base member and the swing member and the other end of which is always in sliding contact with the other, The above grounding measures are taken.
In this case, since the grounding member has a spring force that is always in sliding contact with the base member or the swinging member, it suffices to fix one end of the grounding member with a screw or the like, which reduces the manufacturing cost required for grounding measures. Therefore, it is possible to prevent the trouble such as the breakage of the earth cord as described above.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 shows the opening / closing device 1 of the present embodiment.
The upper part of the copying machine 2 adopting is shown.
Is an original placing table 3, an original pressing plate 5 that is pressed against the placing surface 4 of the original placing table 3 from above, and a rear end portion of the pressing plate 5 is vertically swingable on a rear portion of an upper surface of the original placing table 4. The opening / closing device 1 for pivoting. As shown in FIGS. 1 to 5, in the opening / closing device 1 of the present embodiment, a base member 6 that can be attached to the upper surface of a document placing table 3 and a base end portion of which is pivotally attached to the base member 6 so as to be vertically swingable. Lifting member 8 having a swinging member 7 and a swinging member 7 which is pivotally attached to the tip of the swinging member 7 so as to overlap with the upper surface of the swinging member 7 and has a mounting portion (a mounting plate 33 described later) for the original pressing plate 5. And a biasing member 9 housed inside the swinging member 7 in a stretched state outward in the longitudinal direction thereof.

Of these, the base member 6 is the original placing table 3
A fixed base 11 having a mounting plate 10 for the upper surface of
A lift cam surface 12 that is separably fixed to the fixed base 11 and is in contact with a first cam portion 27 of a biasing member 9 described later.
And a cam member 13 having. As shown in FIG. 5, the fixed base 11 integrally includes the mounting plate 10, a support side wall 14 formed by bending both left and right sides thereof upward, and a rear wall 15 formed by bending a rear end portion upward. The support recess 16 is made of a steel plate and has a semicircular support recess 16 that is open upward at the rear upper end of each support sidewall 14.
Note that the opening direction of the support concave portion 16 may be a forward direction or another direction.

The cam member 13 is made of a synthetic resin block body having the lift cam surface 12 on the front side of the upper surface,
A short columnar boss portion 1 is formed on both left and right sides of the cam member 13.
7 is integrally projected. At the rear of the cam member 13,
A single rocking shaft 18 for supporting the base end of the rocking member 7 so as to be vertically rockable is inserted, and the rocking shaft 18 is arranged so as to pass through the central portion of each boss portion 17. ing. As shown in FIG. 5, the cam member 13 is fitted into the fixed base 11 with its lower half portion sandwiched between the support side walls 14, and fixed screw 19 screwed from the lower surface side of the mounting plate 10 (see FIG. 1). It is attached to the fixed base 11 according to the reference). The boss portions 17 of the cam member 13 are fitted into the support recesses 16 of the support side walls 14 from above, so that the swing shaft 18 cannot be inserted into the support side wall 14 of the fixed base 11. Cam member 1
Only 3 is inserted.

Therefore, in the case of the base member 6 of this embodiment, the fixed base 1 is not required to pull out the swing shaft 18.
1 can be removed from the cam member 13 and therefore
The replacement work of the fixed base 11 due to the change of the specifications of the document placing table 3 can be performed very easily. As shown in FIG. 1, the lift cam surface 12 of the cam member 13 is formed into a curved surface in which the radius of curvature from the swing shaft 18 gradually increases toward the front (left side in FIG. 1). By pressing the first cam portion 27 of the urging member 9 in a compressed state, which will be described later, against 12, the swinging member 7 is always urged upward.

As shown in FIGS. 3 to 5, the swing member 7 is
The side plate 22 is bent from both the left and right sides of the back plate 21, and is made of a steel plate material having a substantially U-shaped cross section. The rocking shaft 1 is provided at the base end portions of the side plate 22.
By inserting the projecting end of 8 into the cam member 1 of the base member 6, the rocking member 7 is prevented from coming off by the ring washer.
It is pivotally attached to the unit 3 so as to be vertically swingable. Each side plate 2
The lower end edge of 2 is provided with a slide flange 23 formed by bending the edge inwardly, and is partitioned between the slide flange 23 and the back plate 21 and between the side plates 22. The biasing member 9 is housed in a space having a rectangular cross section.

As shown in FIGS. 1 to 3, the urging member 9 of the present embodiment has a base end side (right side in FIG. 1) inside the swinging member 7.
, A second slider 25 located on the tip side (on the left side in FIG. 1) inside thereof, and a second slider 25 interposed therebetween in a compressed state and arranged in parallel in the swinging member 7 in the width direction. And a total of three coil springs 26. Of these, the first slider 24 has a first cam portion 27 abutting against the lift cam surface 12 on the base end side, and a synthetic resin block having three storage recesses 28 opening on the front end side therein. The second slider 25 is made of a body and has therein three storage recesses 29 that open to the base end side, and has a second cam portion 30 on the tip end side that contacts a pressed portion 38 described later. It is made of blocks.

Each of the sliders 24 and 25 has the accommodation recesses 28 and 29 facing each other, and the swing member 7 is disposed.
It is housed in the space in the swinging member 7 so as to be slidable in the longitudinal direction (left-right direction in FIG. 1).
In addition, as shown in FIG. 1, the first cam portion 27 is formed of a ridge having a substantially semicircular cross section, and the second cam portion 30 is slightly closer to the base end side (left side in FIG. 1) toward the lower side. It is composed of inclined walls. The three coil springs 26 that cause the elastic force of the biasing member 9 are housed in the housing recesses 28 and 29 of the sliders 24 and 25, respectively, so that the sliders 24 and 25 are compressed. The first cam portion 27 is always pressed against the lift cam surface 12 and the second cam portion 30 is always pressed against the pressed portion 38 described later due to the elastic force of the coil spring 26 which is interposed therebetween. It is like this.

A lift shaft 31 is erected on the tip side of both side plates 22 of the swing member 7, and the tip end of the lift member 8 is pivotally attached to the lift shaft 31. As shown in FIGS. 4 and 5, the lift member 8 includes a casing 32 having a U-shaped cross section, which can just surround the swinging member 7.
The casing 32 is provided with a rectangular mounting plate 33 that is integrally bent from both left and right sides. The casing 32 of the lift member 8 includes a back plate 34 and side plates 35 formed by bending the left and right sides of the back plate 34.
And a hanging wall 36 formed by bending from the tip of the back plate 34. This lift member 8 is
The rear end side (right end side in FIG. 1) is erected on the front end part of the swinging member 7 on the front side (left end part in FIG. 1) of the side plates 35 of the casing 32 so as to be vertically movable. Both ends of the lift shaft 31 are inserted.

When the lift member 8 swings downward around the lift shaft 31 and approaches the swing member 7, the rear plate 34 of the lift member 8 overlaps the upper surface of the rear plate 21 of the swing member 7. At this time, the swinging member 7 is housed in the casing 32 of the lift member 8. Also,
The lift member 8 has its mounting plate 33 attached to the original pressing plate 5.
It is adapted to be attached to the crimp plate 5 by being screwed to a mounting wall 37 (see FIG. 4) formed at the rear end portion. As shown in FIGS. 1 to 3, the drooping wall 36 formed at the tip of the lift member 8 extending downward is provided with a pressed portion 38 with which the second cam portion 30 of the biasing member 9 abuts. The pressed portion 38 of the present embodiment has the hanging wall 36.
Is formed by curving the lower end of the inward curl shape toward the inside of the casing 32.

Thus, in this embodiment, the hanging wall 36
Since the pressed portion 38 for the second cam portion 30 is formed by bending itself, the number of parts can be reduced and the structure of the tip portion of the lift member 8 can be simplified. Further, the pressed portion 38 is the casing 32.
Since it has a curl shape toward the inner side of the second cam portion, the contact surface with respect to the second cam portion 30 becomes a curved surface, and the pressed portion 38 slides smoothly with respect to the second cam portion 30. The wear of 30 can be reduced as much as possible, and the hanging wall 3 can be formed by the pressed portion 38 that is bent and formed in the curl shape.
The bending strength of 6 can be increased.

As shown in FIG. 5, the lift cam surface 12 of the cam member 13 is provided with a fine concavo-convex processing 40 having a lubricating grease retention function, for example, by texturing, whereby the rocking member is formed. Even if 7 swings up and down repeatedly, the lubricating grease is prevented from being scraped up and down both sides of the lift cam surface 12. The fine unevenness processing 40 may be formed on the contact surface of the first cam portion 27. As shown in FIGS. 2 and 5, the grounding member 41 formed of a leaf spring made of a metal plate having good conductivity is provided on the support side wall 14 of the fixed base 11 of the base member 6.
Is fixed, and the tip of the ground member 41 is always in sliding contact with the side plate 22 of the swinging member 7.

In this case, since the earth member 41 has a spring force that is always in sliding contact with the swing member 7, it is sufficient to fix one end of the earth member 41 to the base member 6 with a screw or the like. Compared with the case where the members 6 and 7 are connected by an earth cord, the manufacturing cost required for earthing measures can be reduced. Next, the operation of the opening / closing device 1 having the above configuration will be described. Since the second cam portion 30 of the urging member 9 presses the pressed portion 38 of the lift member 8, the lift member 8 is always urged in the direction in which the lift member 8 overlaps the swing member 7. The lift member 8 swings up and down together with the swing member 7 unless an external force that pulls the end portion away from the swing member 7 acts.

Therefore, when the original is a thin sheet or the like, when the original pressing plate 5 is swung downward to be closed, the lift member 8 swings as shown in FIG. When the original pressure plate 5 is closed, the thin original placed on the original table 3 is pressed by the original pressure plate 5 when the original pressure plate 5 is closed. On the other hand, the first cam portion 27 of the biasing member 9 causes the lift cam surface 12 of the cam member 13 to move.
The oscillating member 7 is always urged in a direction of oscillating upward by pressing, and the urging force is a predetermined oscillating force with respect to the rotational torque around the oscillating shaft 18 due to the weight of the original pressure plate 5. It is set so as to be almost the same except for the dynamic height.

Therefore, when the original pressure plate 5 is rotated upward from the state of FIG. 1, the upward rotation of the original pressure plate 5 is assisted by the urging force of the urging member 9, and the original pressure plate 5 is lightly pressed. 5 can be raised. On the other hand, when the original is a thick thick original 42 such as a dictionary or a picture book, when the original pressure plate 5 is swung downward and closed, the original pressure plate 5 becomes thick as shown in FIG. The lift member 8 rotates about the lift shaft 31 at the time of contact with the object document 42,
Since the rear end portion is separated from the swinging member 7, the original document pressing plate 5 can be pressed from above in an appropriate state in which the original document pressing plate 5 is parallel to the thick original document 42.

Since the pressed portion 38 is constantly pressed by the second cam portion 30, the original pressure plate 5 is changed from the state shown in FIG.
Even when rotating, the upward pressing of the pressing plate 5 is assisted by the urging force of the urging member 9, and the original pressing plate 5 can be pulled up with a light force. In this case, according to the opening / closing device 1 of the present embodiment, the pressed portion 38 with which the second cam portion 30 of the biasing member 9 abuts is connected to the hanging wall 3 of the lift member 8.
6 to form the pressed portion 38 in the lift member 8
Since it is separated from both the left and right side plates 35 of the
It is possible to urge the lift member 8 toward the swing member 7 side without forming a relief notch for allowing the turning of the swing member 7 at the tip end portion of the swing member 7.

Therefore, the shape of the tip of the swinging member 7 can be simplified in that it is not necessary to form a notch for escape.
In this respect, the manufacturing cost of the switchgear 1 can be reduced. Also,
Since it is not necessary to form such a notch in the swing member 7,
The supporting strength of the rocking member 7 can be effectively secured without increasing the plate thickness itself. Further, according to the opening / closing device 1 of the present embodiment, the shape of the swinging member 7 is simplified without forming a notch for escape, so that when the opening / closing device 1 is assembled or operated, It is possible to prevent troubles such as damage to a part of the human body, and since the tip end portion of the lift member 8 is closed by the hanging wall 36, the tip of the opening / closing device 1 is prevented from being pinched by a human fingertip or a document. The safety during operation can be improved.

The present invention is not limited to the above-described embodiment. For example, as shown in FIG. 6, the pressed portion 38 is a cam body 43 which is separate from the hanging wall 36 of the lift member 8. It can also be configured by. The cam body 43 is fixed to the inner surface of the hanging wall 36, has an insertion portion 44 through which the lift shaft 31 is inserted at the upper end portion, and has a curved contact portion 45 for the second cam portion 30 at the lower end portion. I have it. However, in the case of the modification shown in FIG. 6, a cam body 43 which is a member different from the lift member 8 is required, the number of parts is increased, and a work for fixing the cam body 43 to the hanging wall 36 is required. Since it takes a lot of time and labor for processing, it is preferable to bend the hanging wall 36 itself to form the pressed portion 38, as in the above embodiment.

[0034]

As described above, according to the present invention,
Only the cam member without inserting the swing shaft into the fixed base
Since it is inserted into the
The fixed base can be removed from the cam member and the fixed base
It is extremely easy to replace the source. In addition, in the present invention
According to this, since it is not necessary to form a relief notch for allowing the swiveling of the pressed portion at the tip of the swing member, the shape of the tip of the swing member can be simplified and the manufacturing cost of the switchgear can be reduced. In addition, the supporting strength of the rocking member can be ensured without significantly increasing the plate thickness of the rocking member, and the material cost of the switchgear can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of an opening / closing device when a document pressure plate is in a closed state.

FIG. 2 is a side sectional view of the opening / closing device when the original cover is in an open state.

FIG. 3 is a side sectional view of the opening / closing device when the original cover is in a lift-up state.

FIG. 4 is a front cross-sectional view of the opening / closing device of FIG.

FIG. 5 is an exploded perspective view of a document pressing plate opening / closing device.

FIG. 6 is a side sectional view of an opening / closing device for showing a modified example of a pressed portion.

FIG. 7 is a side view of an upper portion of a copying machine that employs the opening / closing device.

[Explanation of symbols]

1 Switchgear 3 Document placing table 5 Original press plate 6 Base member 7 Swing member 8 Lift member 9 Biasing member 10 Mounting plate 11 fixed base 12 Lift cam surface 13 Cam member 18 swing shaft 27 First cam part 30 Second cam part 36 hanging wall 38 Pressed part 40 Fine relief processing 41 Earth member

Continuation of front page (56) Reference JP-A-10-104758 (JP, A) JP-A-11-248341 (JP, A) JP-A-10-315570 (JP, A) JP-A-10-47337 (JP , A) JP-A-9-62399 (JP, A) Actually open 5-67093 (JP, U) Actually open 61-37369 (JP, U) Actually open 9-96877 (JP, U) JP 4-18287 (JP, B2) Japanese Patent Publication No. 4-19532 (JP, B2) Utility model registration 3056359 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 27/00-27 / 80

Claims (6)

(57) [Claims] 1. A base member attachable to an upper surface of a document placing table, a swing member whose base end is pivotally attached to the base member so as to be vertically swingable, and an upper surface side of the swing member. A lift member pivotally attached to the front end of the same member and to which a document pressing plate covering the document placing table from above can be attached; and a lift member housed in the swinging member in a state of being stretched outward in the longitudinal direction thereof. A biasing member having a first cam portion on the base end side that biases the swinging member upward, and a second cam portion on the tip end side that biases the lift member in a direction overlapping the swinging member. , The base member faces the upper surface of the document table.
Separated into a fixed base with a mounting plate
Is fixed so that the first cam portion of the biasing member abuts.
And a cam member having a cam surface, and the cam member is provided with boss portions projecting on both left and right side surfaces thereof.
And pivotally attach the rocking member so as to penetrate the boss.
Rocking shaft for insertion is inserted, and the fixed base has support side walls on both left and right sides of the mounting plate.
The supporting shaft has the swing shaft inserted therethrough.
Without forming a support recess into which the boss is fitted.
A device for opening and closing the original pressure plate. 2. A downwardly extending end of the lift member.
A hanging wall is formed, and the second cam portion of the biasing member contacts
And a pressed portion provided on the hanging wall.
The opening / closing device for a document pressure plate according to claim 1. 3. The pressed portion is the hanging wall itself.
The opening / closing device for a document pressure plate according to claim 2, wherein the opening / closing device is formed by bending . 4. The pressed portion is such that the lower end of the hanging wall is inside.
Is formed by curling toward the
The opening / closing device for a document pressure plate according to claim 3 . 5. The base member includes a cam member having a lift cam surface with which the first cam portion of the biasing member abuts,
The opening / closing device for the original pressing plate according to any one of claims 1 to 4, wherein the lift cam surface, the contact surface of the first cam portion, or both of them are finely roughened so as to retain lubricating grease. 6. A grounding member having a spring force, one end of which is fixed to one of the base member and the swinging member, and the other end of which is always in sliding contact with the other, is provided. The device for opening and closing the original pressure plate as described in.