JP3627438B2 - Opening / closing mechanism of document holding cover - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cover opening / closing mechanism for pressing a document placed on the reading unit of an image reading apparatus that places the document stationary on a reading unit and reads the stationary document.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an image reading apparatus that places a document such as a book stationary on a reading unit and reads the stationary document, a so-called flatbed type image reading apparatus, the document is pressed from above the document placed on the reading unit. The presser cover was provided so that it could be opened and closed. As a mechanism for opening and closing the press cover, a base support member attached to the base of the reading unit and a cover support member fixed to the press cover are pivoted, and the base support member and the cover support member When the presser cover is closed, it is biased in the closing direction, and when the presser cover is open, it is biased in the open direction so that the presser cover is opened or closed. A mechanism for holding each of these is known.
[0003]
[Problems to be solved by the invention]
However, in the press cover on which the document supply tray and the document discharge tray for continuous document feeding of the image reading apparatus are mounted, the weight of the press cover is considerably heavy. In order to stably maintain the state, a spring having a considerably large urging force has been used for the urging rod of the opening / closing mechanism.
For this reason, when the presser cover is opened and kept stationary, a large impact is generated by the biasing force of the spring. Further, if the spring biasing force is weakened to reduce this impact, the open state is unstable.
Therefore, there is a demand for an opening / closing mechanism that stably holds the open state and reduces the impact when the presser cover is opened and stopped in the open state.
[0004]
[Means for Solving the Problems]
The present invention uses the following means in order to solve the above problems in the opening / closing mechanism of the document pressing cover. That is, the machine frame and an original pressing of example cover attaching openably to the machine frame the document pressing cover document placed presses from above on the mounting table having a mounting portion for mounting a document of different thickness In the opening / closing mechanism, the cover-side support member to which the document pressing cover is attached is attached to the base-side support member that is attached to the base so as to be rotatable up and down, and the base-side support member and the cover After the document support cover is completely closed, the fulcrum is exceeded before the document support cover is completely closed , and the document support cover is urged in the closing direction. An elastic compression spring that biases the document pressing cover in the opening direction and an impact absorbing member that absorbs an impact when the document pressing cover is stationary in the open state are arranged.
[0005]
The shock absorbing member is provided on each of the machine base side support member and the cover side support member, and is configured by members that come into contact with each other when the document pressing cover is stationary in the open state.
[0006]
In addition, at least one member of the impact absorbing member provided on each of the machine base side support member and the cover side support member is configured by an elastic member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an opening / closing mechanism for a document pressing cover according to the present invention, and is a partial side sectional view showing a state in which the pressing cover is opened. FIG. 3 is a partial cross-sectional side view showing a state in which a thick original on the loading unit is pressed by a pressing cover, and FIG. 4 is an upper view of a stationary original in which the opening / closing mechanism of the original pressing cover of the present invention is applied. FIG. 5 is a partial side view showing the inside of the image reading unit of the image recording apparatus, and FIG. 6 is an image recording provided with a document pressing cover equipped with a continuous document feeding unit. It is a perspective view of an apparatus.
[0008]
First, as an application example of the document pressing cover opening / closing mechanism of the present invention, an image recording apparatus in which an image reading unit for a stationary document is formed at the top will be described with reference to FIGS. As a case structure of the entire apparatus, a reading case A ′ and a recording case 10 are arranged vertically. The image reading unit is formed on the upper part of the image recording apparatus, and a transparent stationary document placing surface B ′ for placing a document such as a book stationary is disposed on the upper surface of the image reading unit. Yes.
Then, on the side of the stationary document placement surface B ′, a document pressing cover C ′ is attached to the reading case A ′ via an opening / closing mechanism so as to be freely opened and closed. The document placed on the stationary document placement surface B ′ is pressed from above.
[0009]
In the reading case A ′, as shown in FIG. 5, a photoelectric conversion unit 13 having a lens 13a and a photoelectric converter 13b is fixed on the bottom surface thereof, and a first light source 11a and a first reflecting mirror 11b are provided. The scanning body 11 and the second scanning body 12 having the second reflecting mirror 12a and the third reflecting mirror 12b are conveyed below the stationary document placing surface B ′, and the stationary document is placed by the light source 11a. The placement surface B ′ is irradiated, and an image of the document D ′ placed thereon is reflected through the first reflecting mirror 11b, the second reflecting mirror 12a, and the third reflecting mirror 12b, and the photoelectric conversion is performed. The image is formed on the lens 13a of the unit 13 and converted into an electronic signal by the optical converter 13b.
[0010]
A feeding document reading unit 14 is disposed on the upper side of the reading case A ′ adjacent to the stationary document placing surface B ′, and a continuous document feeding unit 15 is disposed above the feeding document reading unit 14. In addition, a discharge tray 18 is disposed on the upper surface of the document pressing cover C ', and a document supply tray 17 on which a plurality of documents can be placed in a stacked manner is disposed above the discharge tray 18, and the sheets are fed continuously one by one. The document can be read. In this case, the first scanning body 11 and the second scanning body 12 are kept stationary below the feeding document reading unit 14.
[0011]
Based on the image information read by the image reading unit or the received facsimile information, recording is performed on a recording sheet by a recording unit formed in the recording case 10.
[0012]
When the presser cover opening / closing mechanism of the present invention shown in FIGS. 1 to 3 is applied to the image recording apparatus as described above, the machine base A is the reading case A ′ and the document placement portion B is the stationary document. The placement surface B ′, the pressing cover C are replaced with the document pressing cover C ′, and the document D is replaced with the document D ′. Based on this premise, the document holding cover opening / closing mechanism according to the present invention will be described with reference to FIGS.
[0013]
A machine base side support member 6 is fixed to the side of the mounting portion B in the machine base A, and a sliding support member 7 is fitted into the machine base side support member 6 so as to be slidable up and down. The directly attached cover-side support member 8 is pivotally supported on the sliding support member 7 at a pivot point P3, and the biasing rod 4 is wound around the compression spring 5 as a spring member. The base end 4 a is pivotally supported closer to the mounting part B than the pivot point P 3 of the sliding support member 7, and the distal end 4 b is pivoted to the distal end portion of the cover side support member 3.
A long slot 6a for guide is formed in the machine-side support member 6, and the position adjusting pin 9 is engaged with the sliding support member 7 through the long slot 6a for guide. Yes.
[0014]
Further, the upper end portion of the rear surface of the sliding support member 7 is bent forward to form a contact portion 7a. An elastic member 21 is disposed on the inner side surface of the lower portion of the rear surface of the cover side support member 8. The elastic member 21 is made of, for example, rubber or synthetic resin, and is fixed to the inner side surface of the rear surface of the cover side support member 8 using bolts 22 or the like.
The lower end of the elastic member 21 and the upper surface of the contact portion 7a are in contact with each other when the pressing cover C is opened, and the position of the pressing cover C in the opened state is determined.
[0015]
FIG. 1 shows a state in which the pressing cover C is opened, and FIG. 2 shows that there is no document on the placement portion B or an extremely thin document D is placed, and the pressing cover C is placed on the placement portion. A closed state is shown on B. In the state where the presser cover C is opened, the compression spring 5 is biased in the extending direction, and therefore the cover-side support member 8 is biased in the direction in which the presser cover C is opened by the compression spring 5. The pressing cover C is stationary at the position where the elastic member 21 and the contact portion 7a contact each other, and stably holds the open state. Further, when the cover C is closed from the state in which the pressing cover C is opened, the cover C is rotated downward against the urging force in the direction in which the compression spring 5 opens. Then, just before the pressing cover C is completely closed, the urging force by the compression spring 5 exceeds the fulcrum, and when the pressing cover C is closed, the compression spring 5 urges the cover C in the closing direction. It becomes.
[0016]
That is, when the presser cover C is open, the base end 4a of the biasing rod 4 is below the line connecting the center of the tip 4b of the biasing rod 4 and the center of the pivot point P3. The cover-side support member 8 is biased in the direction in which the pressing cover C is opened by the biasing force, and when the pressing cover C is closed, the cover-side support member 8 is above the line connecting the center of the tip 4b and the center of the pivot point P3. Since the base end 4 a of the biasing rod 4 is present, the cover-side support member 8 is biased in the direction in which the pressing cover C is closed by the biasing force of the compression spring 5.
[0017]
With the above configuration, when the presser cover C is closed, the cover C is urged downward to stably hold the closed state. When the presser cover C is opened from this closed state, If the cover C is lifted up a little, the urging force of the compression spring 5 exceeds the fulcrum and urges the cover C to open, so that the pressing cover C is automatically opened.
Then, at the position where the elastic member 21 and the contact portion 7a are in contact with each other, the presser cover C is stationary and stably held in the open state. When the elastic member 21 and the contact portion 7a come into contact with each other, the elastic member 21 absorbs the impact of the contact, so that the impact can be reduced.
[0018]
Further, as shown in FIG. 5, when the document D having a certain thickness is placed on the placement portion B, the sliding support member 7 slides upward in the machine side support member 6. As a result, the position of the pivot point P3 is increased, that is, the base end of the cover side support member 8 can be increased, so that the cover side support member 8 can be leveled, and a pressing cover integrated therewith In C, the document D can be reliably pressed down.
[0019]
The document pressing cover opening / closing mechanism configured as described above has a large urging force of the compression spring 5 wound around the urging rod 4, and the contact portion of the cover-side support member 8 to the sliding support member 7. The elastic member 21 is attached to the cover-side support member 8, and the elastic member 21 attached to the cover-side support member 8 comes into contact with the contact portion 7a of the slide support member 7 when the presser cover C is opened and kept stationary. Since the shock is absorbed, the shock when the pressing cover C is stopped in the open state can be surely mitigated.
Further, the elastic member 21 is formed to have a hardness that can stably hold the pressing cover C open and stationary.
[0020]
As shown in FIG. 6, when applied to an image recording apparatus, the continuous document feeding unit 15 is attached to the pressing cover C ′, and is configured to open and close integrally with the pressing cover C ′. Even when the weight of the presser cover C ′ is further increased, the elastic member 21 is formed to a hardness that can stably hold the presser cover C ′ open and stationary, and the presser cover C ′. It is configured so that the impact when the arm is opened and kept stationary can be reduced.
As a result, the effect of reliably mitigating the impact when the pressing cover C is stationary in the open state and the effect of stably holding the pressing cover C open and stationary are produced in the same manner.
[0021]
【The invention's effect】
The present invention has the following effects in the opening and closing mechanism of the document pressing cover, and has the following effects. First, as described in claim 1, a machine base having a placement part for placing documents of various thicknesses and a document pressing cover for pressing the document placed on the placement part from above can be opened and closed on the machine base. in the document pressing of example cover opening and closing mechanism for attaching the cover-side support member fitted with the document pressing cover, together with the mounted for vertical pivoting relative to the machine base side supporting member mounted to said machine base, said machine base Between the side support member and the cover side support member, the fulcrum is exceeded before the document pressing cover is completely closed, and the document pressing cover is urged in the closing direction, and the closed document pressing cover is opened. and telescopic compression spring which biases the direction of opening the document pressing cover after traversal fulcrum, and a shock absorbing member that absorbs a shock when the document pressing cover rests in the open state Therefore, the elastic member abuts against the abutting part of the sliding support member to absorb the impact, and the impact when the presser cover is stationary in the open state is reliably reduced by using a simple member. We were able to.
In addition, when opening the holding cover in the closed state , the compression spring can automatically open the holding cover over the fulcrum by lifting the cover slightly, and the holding cover is open and stationary. Could be held stably.
[0022]
Further, according to a second aspect of the present invention, the shock absorbing member is provided on each of the machine base side support member and the cover side support member, and is configured by members that come into contact with each other when the document pressing cover is stationary in the open state. since the are,
The position of the pressing cover in the opened state is determined by these impact absorbing members, and the opened state is stably held at the maximum upward rotation point at which the pressing cover rests. Further, when the members provided on the machine base side support member and the cover side support member are in contact with each other, the impact of the contact is absorbed, so that this impact can be mitigated.
[0023]
Further, as in claim 3, at least one member of the shock absorbing member provided on each of the machine base side support member and the cover side support member is constituted by an elastic member.
By using a simple member, the impact when the presser cover is kept stationary can be reliably mitigated, and by using a simple member, the state where the presser cover is open and stationary can be stabilized. And was able to hold.
[Brief description of the drawings]
FIG. 1 is a side partial cross-sectional view showing a state in which a pressing cover C is opened, which is an opening / closing mechanism for a document pressing cover according to the present invention.
FIG. 2 is a partial side cross-sectional view showing a state of being similarly closed on the mounting portion B.
FIG. 3 is a partial cross-sectional side view showing a state where a thick original on the placement portion B is pressed by a pressing cover.
FIG. 4 is a perspective view of an image recording apparatus having an image reading unit for a stationary document on an upper portion to which the document pressing cover opening / closing mechanism of the present invention is applied.
FIG. 5 is a partial side view showing the inside of the image reading unit of the image recording apparatus.
FIG. 6 is a perspective view of an image recording apparatus including a document pressing cover on which a continuous document feeding unit is mounted.
[Explanation of symbols]
A Machine base B Place C Holding cover D Document P3 Pivoting point 4 Energizing rod 5 Compression spring 6 Machine side support member 7 Sliding support member 7a Abutting part 8 Cover side support member 16 Continuous document feeder 17 Document Supply tray 18 Document discharge tray 21 Elastic member 22 Bolt

Claims (3)

A machine base having a mounting portion for mounting a document of different thickness, open attaching opening and closing of the document pressing of example covers the document placed on the mounting table in the document pressing machine base cover presses from above In the mechanism,
The cover side support member to which the document pressing cover is attached is attached to the machine side support member attached to the machine base so as to be vertically rotatable,
Between the machine-side support member and the cover-side support member, the document pressing cover is urged in a direction to close the document pressing cover by closing the document pressing cover before the document pressing cover is completely closed and closed. An elastic compression spring that urges the document pressing cover in the opening direction after opening the fulcrum, and an impact absorbing member that absorbs an impact when the document pressing cover is stationary in an open state,
An opening / closing mechanism for a document pressing cover, characterized in that The shock absorbing member is provided on each of the machine-side support member and the cover-side support member, and is configured by members that come into contact with each other when the document pressing cover is stationary in an open state. An opening / closing mechanism for the document pressing cover according to Item 1. 3. The document pressing cover opening / closing mechanism according to claim 2, wherein at least one of the shock absorbing members provided on the machine base side support member and the cover side support member is formed of an elastic member.

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