JPH026440Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improved technique for a document holding device installed in an electrostatic photocopier or the like.

[Prior Art] FIG. 6 shows a conventional document holding device. In the figure, reference numeral 1 denotes a body frame on which a contact glass 2 is attached. On the upper surface of this body frame 1, the contact glass 2 is attached. A mounting member 4 is provided along the vicinity of one side edge.

3 is a document presser that can be opened and closed, and is a flexible document presser sheet 3c whose surface on the contact glass side is white.
, a soft member 3b such as a sponge attached to the upper surface of the sheet 3c, and a sheet pressing member 3a attached to the upper surface of the soft member 3b, and one side edge of the document presser 3. is immovably attached to the attachment member 4 via a pin 5.

Reference numeral 6 denotes a hard document presser holding member that holds the free end side of the document presser 3, one end of which is pivotably attached to a hinge 7 provided near the mounting member 4.

A support member 8 is provided on the free end side of the document presser holding member 6 and is movable in a direction extending between the opening/closing base side and the free end side of the document presser sheet 3c. A sheet pressing member 3a of the presser foot 3 is continuously provided.

Reference numeral 9 denotes a lamp for exposing the original document, which is provided below the contact glass 2.

[The problem that the idea attempts to solve]

In the document holding device having such a configuration, the document holding sheet 3c on the side closer to the lamp 9 thermally expands as the lamp 9 generates heat during exposure.
The document presser 3 is now bent upward,
Alternatively, when the sheet pressing member 3a receives external heat such as sunlight, the sheet pressing member 3a thermally expands and the document pressing member 3a
Due to the difference in the amount of expansion and contraction due to thermal expansion between the sheet pressing member 3a and the original holding sheet 3c, the original holding sheet 3, which should be flat, takes on a wavy curved surface. The adhesion of the document to the glass 2 is reduced, and this bending of the document presser 3 poses a major obstacle to obtaining clear images.

SUMMARY OF THE INVENTION An object of the present invention is to provide a document holding device suitable for obtaining clear images that prevents the document holding device from bending due to the difference in expansion and contraction due to thermal expansion.

[Means to solve the problem]

In order to achieve the above object, the present invention separates the document holding sheet and the sheet pressing member from each other,
and at least one of the opening/closing base side or the free end side of the original holding sheet with respect to the mounting member and the original holding member, and the free end side of the sheet pressing member with respect to the original holding member, The opening/closing base side of the sheet pressing member is attached to the opening/closing base side and the free end side of the original holding sheet with respect to the mounting member, and the opening/closing base side of the sheet pressing member is attached to the opening/closing base side and the free end side of the original holding sheet. It is unique in that it is attached so that it cannot move in the direction that spans the direction.

[Effect]

According to the above characteristic structure, the document presser sheet and the sheet pressing member thermally expand independently without interfering with each other, thereby preventing the document presser from warping or bending due to differences in expansion and contraction of thermal expansion.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the specific structure of a document holding device according to the present invention, and FIG. 2 shows an electrophotographic copying machine A equipped with the document holding device.

In the figure, 21 is a fuselage frame on which the contact glass 22 is attached, and 11 is a mounting member with a crank-shaped cross section, which is attached to the contact glass 22.
It is provided on the upper surface of the fuselage frame 21 along the vicinity of one side edge.

Reference numeral 10 denotes a document holder that can be opened and closed and covers the entire surface of the contact glass 22, and one side edge of the document holder 10 is attached to the mounting member 11 via a plurality of pins 16.

13 is the document presser 10 via the support member 12.
is a hard original holding member that holds the free end side of the contact glass 22, and is located near the center of the mounting member 11 in the longitudinal direction (hereinafter referred to as the left-right direction X-Y for convenience) along one side edge of the contact glass 22. It is pivotally connected to a provided hinge 14 so as to be swingable.

Reference numeral 23 denotes a lamp for exposing an original, which is provided below the contact glass 22.

Next, the document presser 10 and the support member 12
The specific structure of will be explained.

First, the original presser 10 presses the contact glass 2.
2, a flexible original holding sheet 10c whose surface corresponding to 2 is white; a soft member 10b such as a sponge attached to the upper surface of the sheet 10c; Soft member 1
The sheet pressing member 10a is separated from the sheet pressing member 10a in a state of edge cutting, and as shown in FIG. A plurality of elongated holes 10a' extending in the left-right direction X-Y and having substantially the same diameter as the diameter are formed at predetermined intervals in the left-right direction X-Y.

On the other hand, on the opening/closing base side of the soft member 10b,
A long hole 10 formed in the sheet pressing member 10a
Corresponding to a′, for example, a plastic tongue piece 1
5 is attached to the tongue piece 15, and the direction extending from the opening/closing base side and the free end side of the document holding sheet 10c (hereinafter, for convenience, the front-rear direction U) is attached to the tongue piece 15.
The elongated hole 15' (referred to as -V) has a width in the short axis direction larger than the diameter of the pin 16.
The pin 16 is inserted into these elongated holes 10a' and 15'.

The sheet pressing member 10a is configured to be slightly movable in the left-right direction X-Y with respect to the mounting member 11, but not movable in the front-back direction UV. is integrally formed with the original holding sheet 10c and is configured to be movable in the front and back as well as in the left and right directions UV and XY with respect to the mounting member 11.

Further, as shown in FIG. 3B, on the free end side of the sheet pressing member 10a, a plurality of elongated holes 10a'' in the front-rear direction UV are formed at predetermined intervals in the left-right direction X-Y. There is.

Next, the support member 12 moves the document presser holding member 1
A communication member 12a is slidably held with respect to a guide member 13a in the front-rear direction UV provided on the free end side of the sheet pressing member 10a, and a U-shaped member 12a is arranged to bypass the free end side of the sheet pressing member 10a. holding member 12b and the long hole 10 on the free end side of the sheet pressing member 10a.
The long hole 10 has a diameter slightly smaller than the short axis width of a″.
It consists of a pin 12c that is inserted into the U
The free end side of the soft member 10b stuck to the document holding sheet 10c is connected to the lower surface of the character-shaped holding member 12b via, for example, double-sided tape.

The free end side of the sheet pressing member 10a is configured to be movable in the front and rear as well as the left and right directions UV and XY with respect to the support member 12, and
The soft member 10b is integrated with the support member 12 and is configured to be movable only in the front-rear direction UV.

That is, the seat pressing member 10a has its opening/closing base side facing the mounting member 11 in the front-rear direction U-
The sheet pressing member 10a is configured to be immovable in the V direction but movable in the left-right direction X-Y, and
The free end side of the support member 12 is configured to be movable back and forth as well as in the left and right directions UV and XY with respect to the support member 12.

On the other hand, the soft member 10b is attached to the document holding sheet 1.
0c, the opening/closing base side thereof is in the longitudinal and lateral directions U-V, relative to the mounting member 11,
It is configured to be movable in X-Y, and the free end side is connected to the document presser holding member 1 via the support member 12.
3, and the free end side of the document holding sheet 10c is configured to be movable in the left-right direction X-Y by deforming the soft member 10b. It is being done.

According to the above configuration, when the document presser 10 receives heat due to lighting of the lamp 23 during exposure or heat due to direct sunlight, the sheet pressing member 10
Although a difference in expansion and contraction occurs due to thermal expansion between the sheet pressing member 10a and the original holding sheet 10c, the sheet pressing member 10a and the original holding sheet 10c are separated from each other, and the opening/closing base side of the sheet pressing member 10a is It is attached to the mounting member 11 so as not to be movable in the front-rear direction UV, and the opening/closing base side and the free end side of the original holding sheet 10c, and the above-mentioned Since the free end sides of the sheet pressing members 10a are respectively attached so as to be movable in the front-rear direction UV, the difference in expansion and contraction caused by the thermal expansion is absorbed at each attachment part, and the difference in expansion and contraction caused by the difference in the amount of expansion and contraction as in the conventional case is absorbed. The document presser 1 can be pressed without causing undulation of the document presser 10.
0 can always be kept flat, and by extension, the document can be pressed uniformly against the contact glass surface at all times, making it possible to copy clear images.

In addition, by configuring at least one of the opening/closing base side and the free end side of the original holding sheet 10c to be movable in the front-rear direction UV with respect to the mounting member 11 and the original holding member 13, the above-mentioned heat can be removed. It is possible to absorb the difference in the amount of expansion and contraction due to expansion.

Also, the left and right direction X due to the heat of the document presser 10
- Regarding the expansion and contraction of Y, the sheet pressing member 10
The opening/closing base side and the free end side of the soft member 10b are configured to be movable in the left-right direction X-Y with respect to the mounting member 11 and the supporting member 12, and the opening/closing base side of the soft member 10b is configured to be movable in the left-right direction X-Y with respect to the mounting member 11 and the support member 12. On the other hand, the sheet pressing member is movable in the left-right direction X-Y, and the free end side of the document holding sheet 10c is movable in the left-right direction The document holding sheet 10a and the original holding sheet 10c do not interfere with each other in terms of expansion and contraction due to heat.

As shown in FIG. 4, with the free end side of the document presser holding member 13 slightly lifted, the opening/closing base side of the sheet pressing member 10a moves in the front-rear direction UV with respect to the mounting member 11. In addition, in a portion Q near the free end side of the document presser 10, the end of the sheet pressing member 10a abuts the curved portion of the U-shaped holding member 12b integrated with the soft member 10b. In addition, the pressing force due to the weight of the original holding sheet 10c, the soft member 10b, and the sheet pressing member 10a, and the weight and stiffness of the sheet pressing member 10a are combined,
Since the document holding sheet 10c is pressed by the sheet pressing member 10a at a portion P close to its opening/closing base side, the opening/closing base side of the document holding sheet 10c is movable in the front-rear direction UV with respect to the mounting member 11. Although it is installed
Misalignment with respect to the original or the contact glass 22 does not occur.

Further, the support member 12 is attached to the original holding sheet 10.
Since the support member 12 is configured to be immovable in the left-right direction X-Y on the free end side with respect to
There is no wobbling, and the opening/closing operation of the document presser 10 can be performed stably and smoothly.

Furthermore, since the free end side of the sheet pressing member 10a is held by the document presser holding member 13 via the rigid U-shaped holding member 12b, the sheet pressing member 10a is separated from the document presser holding member 13. No parts hang downward.

In addition, in the above embodiment, the U-shaped holding member 12b
The end portion of the sheet pressing member 10a is configured to come into contact with the curved portion of the sheet pressing member 10a, and the pin 12c is configured to come into contact with the opening/closing base side of the elongated hole 10a'' of the sheet pressing member 10a. Also good.

Further, in the above embodiment, the document holding sheet 10
A tongue piece 15 is provided on the soft member 10b integrated with the soft member 10b, and a long hole 15' is formed in this tongue piece 15. It may be engaged with the member 11,
Furthermore, the thickness of the document holding sheet 10c may be increased and the soft member 10b may be omitted.

FIG. 5 shows another embodiment of the structure for holding the document presser 10 on the free end side of the document presser holding member 13. As shown in FIG.

In this case, a U-shaped holding member 12b is formed so as to detour the free end side of the document presser 10, and a long hole 10 on the free end side of the sheet pressing member 10a is formed.
A long hole 10c' is formed in the left-right direction X-Y direction on the free end side of the document holding sheet 10c facing the document presser sheet 10c, and a pin 12c is inserted through these long holes 10a'', 10c'. Document holding sheet 1 is placed against member 12.
The free end side of 0c is movable in the left and right direction.

According to such a configuration, the U-shaped holding member 12b
There is an advantage that it is not necessary to connect the original holding sheet 10c to the document holding sheet 10c using, for example, double-sided tape.

[Effect of idea]

As explained above, in the present invention, a mounting member is provided along the vicinity of one side edge of the contact glass, and each document presser is composed of a flexible document presser sheet and a sheet pressing member for pressing the sheet. A document holding device comprising a hard document presser holding member that is attached to the attachment member so as to be openable and closable and that holds the free end side of the document presser, and is pivotably pivoted near the attachment member, The document presser sheet and the sheet pressing member are separated from each other, and at least one of the opening/closing base side or the free end side of the document presser sheet with respect to the mounting member and the document presser holding member, and the document presser holding member The free end side of the sheet pressing member is attached movably in a direction spanning the opening/closing base side and the free end side of the original holding sheet, respectively, and the opening/closing base side of the sheet pressing member is attached to the mounting member. Since the original holding sheet is attached so as to be immovable in the direction spanning the opening/closing base side and the free end side, the sheet pressing member and the original holding sheet do not interfere with each other due to expansion and contraction due to heat, and therefore, The undulation of the document holder due to the difference in the amount of expansion and contraction as in the conventional structure no longer occurs, and since the document holder always maintains a flat state, the document is always evenly pressed against the contact glass surface, resulting in a sharp image. It has now become possible to provide a document holding device that can copy images.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the document holding device, FIG. 2 is a perspective view of an electrostatographic copying machine equipped with the document holding device of the present invention, and FIG. 3A is a partial sectional view of the opening/closing base side of the document holding device. , FIG. 3B is a partial sectional view of the free end side of the document holding device, FIG. 4 is a sectional view of the document holding device for explaining the operation, and FIG. 5 shows another embodiment of the holding structure on the free end side of the document holding device. FIG. FIG. 6 is a sectional view of a conventional document holding device. DESCRIPTION OF SYMBOLS 10... Document presser, 10a... Sheet pressing member, 10c... Document presser sheet, 11... Mounting member, 22... Contact glass, 13... Hard document presser holding member.

Claims (1)

[Scope of utility model registration request] A mounting member is provided along the vicinity of one side edge of the contact glass, and a document presser, each consisting of a flexible document presser sheet and a sheet pressing member for pressing the sheet, is attached to the attachment member so as to be openable and closable;
and a document holding device comprising a hard document presser holding member that holds the free end side of the document presser and pivotably pivoted near the mounting member, the document presser sheet and the sheet pressing member are separated from each other,
and at least one of the opening/closing base side or the free end side of the original holding sheet with respect to the mounting member and the original holding member, and the free end side of the sheet pressing member with respect to the original holding member, The opening/closing base side of the sheet pressing member is attached to the opening/closing base side and the free end side of the original holding sheet with respect to the mounting member, and the opening/closing base side of the sheet pressing member is attached to the opening/closing base side and the free end side of the original holding sheet. A document holding device characterized in that it is attached so as to be immovable in a direction spanning the direction.