JPH02299367A - Optical original reader - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an optical document reading device.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG.
Hold the original lot placed on the top surface of the
There is an optical document reading device that reads an image of a document by moving an optical unit (not shown) facing the lower surface of the contact glass 100 in the sub-scanning direction A.

Problems to be Solved by the Invention In the optical document reading device described above, the document presser 10
2 in the opening direction and place the edge of the original 101 on the scale 103 and set the original 101 on the contact glass lOO, or as shown in FIG. Manuscript to
Place the original 101 on the contact glass 1 by touching the edge of the ot.
The original lot is set on the original lot with the original presser 102.
When pressing the document 101, the document 101 may move and its side edges may not be parallel to the side edges of the contact glass 100.

Further, 106 in FIG. 14 is a guide shaft that guides the optical unit in the sub-scanning direction, but it is difficult to align the document abutting plate 105 with a straight line perpendicular to the guide shaft 106 as shown in FIG. , may be tilted by an angle θ due to manufacturing, and in this case too, the edge of the original 101 is not parallel to the side edge of the contact glass lOO. FIG. 16 is a plan view showing the posture of the original 101, where the solid line shows the normal state and the imaginary line shows the original 101 tilted at an angle θ. This condition cannot be known unless the read image is output (for example, copied) and viewed. When resetting the original 101, the working conditions are exactly the same, so the same phenomenon as when setting the original for the first time may occur.In the end, the original 101 may have to be reset several times, making the operation inconvenient. It is. In addition, when reading lines in the main scanning direction of a lot of documents, the document 1
01 is tilted, the document 1 is tilted as shown in FIG.
01 in the main scanning direction is inclined, and when read data is output, the image deteriorates as shown in FIG. 18.

In this way, even if the scale 103 and the document abutting plate 105 are installed accurately, the document 101 may be tilted when the document presser 102 is lowered. Although there is a method of converting image information into regular information by rotating the image by θ, such a method requires a large capacity memory and has the drawback of increasing costs.

Means for Solving the Problems In an optical document reading device in which a document placed on a transparent contact glass is held down by a document presser that can freely rise and fall, and an optical unit is moved in the sub-scanning direction along the contact glass, the contact A fulcrum portion was provided to support the glass and the document holder rotatably in the plane direction of both.

If the scanning line in the main scanning direction of the original is not perpendicular to the sub-scanning direction, release the original holder by rotating the contact glass holding the original and the original holder around the fulcrum. The orientation of the original can be corrected accurately without any problems.

Embodiment A first embodiment of the present invention will be explained based on FIGS. 1 and 2. 1 is a housing, and this housing 1 is formed by combining a bottom cover 2 and a top cover 3.

The top surface of this top cover 3 is largely open in the center,
A transparent contact glass 5 on which a document 4 is placed and a document presser 6 are provided so as to cover the periphery of the open portion. One side of the contact glass 5 and the document holder 6 are connected by a screw 7. Further, on the upper surface of the top cover 3, a fulcrum shaft 8, which is a fulcrum that rotatably holds the center of one side of the contact glass 5 and the document holder 6, has an axis perpendicular to the plane of the contact glass 5. It is erected. Further, a linear bending portion 9 is formed along one side of the document presser 6. Furthermore, the left side of the rotating free end side of the contact glass 5 and the top cover 3
A spring 10 is stretched between the contact glass 5 and an eccentric cam 11 that comes into contact with the left side of the contact glass 5.

This eccentric cam 11 is fixed together with a gear 13 to a rotating shaft 12 rotatably supported by the bottom cover 2, and a motor 15 that can freely rotate in forward and reverse directions and drives a gear 14 meshed with the gear 13 is attached to the bottom cover 2. installed.

In such a configuration, the original 4 is set on the contact glass 5 by bending the bending portion 9 and raising the original presser 6 upward, and then the original 4 is set on the contact glass 5 by the original presser 6.
hold down. In this state, by moving the optical unit (not shown) inside the housing 1 in the sub-scanning direction, the image of the document 4 is read by the optical unit.

When this read image is output in the form of a copy, for example, it can be seen whether the reading line in the main scanning direction is parallel to a straight line perpendicular to the sub-scanning direction or inclined. If it is inclined, the motor 15 to rotate the eccentric cam 11. As a result, the contact glass 5, which is rotated by the biasing force of the spring 10, comes into contact with the eccentric cam 11, which stops at an arbitrary position, and comes to rest. At this time, the original presser 6 is coupled to the contact glass 5 by the screw 7, and therefore rotates integrally with the contact glass 5. Therefore, the document 4, the contact glass 5, and the document presser 6 can be rotated together, and the side edges of the document 4 can be made parallel to the sub-scanning direction without raising the document presser 6.

Next, a second embodiment of the present invention will be described based on FIGS. 3 and 4. Components that are the same as those in the embodiment described above are designated by the same reference numerals, and description thereof will be omitted (the same applies hereinafter).

In this embodiment, one corner of a contact glass 5 and a document holder 6, which are connected to each other by a screw 7, is rotatably supported by a fulcrum shaft 8, and a gear is attached to a corner of the contact glass 5 with this fulcrum shaft 8 as a radial center. 16, and a gear 17 meshed with this gear 16 is connected to a motor 15 and rotatably provided on the upper surface of the top cover 3.

Therefore, by rotating the gear 17 in the normal or reverse direction using the motor 15, the same objective as in the embodiment described above can be achieved.

Furthermore, FIG. 5 shows a third embodiment of the present invention.

A document abutting plate 18 and a glass holder 19 are fixed to one longitudinal end of the contact glass 5, and a glass holder 21 having a protrusion 20 is fixed to the other end. These fixing means are, for example, adhesives. A glass stay 23 having an opening 22 formed in the center is provided. This glass stay 23 is fixed inside the housing l, and one longitudinal end of the glass stay 23 is attached to the glass holder 1.
A fulcrum shaft 8 that rotatably supports the fulcrum shaft 9 is provided upright, and a screw holder 24 and a spring holder 25 are attached to the other end. The screw holder 24 has a knob 2 at the end.
The spring holder 25 has a sliding rod 28 which is biased toward the screw 27 by a spring 29 and is slidably held in the spring holder 25. The protrusion 20 of the glass holder 21 is held between the ends of the screw 27 and the sliding rod 28. The knob 26 is projected to the outside of the housing l.

In such a configuration, when the image of the original 4 is read and the reading line in the main scanning direction is inclined with respect to a straight line perpendicular to the sub-scanning direction, gripping the knob 26 and rotating the screw 27 will cause the line to be read in the main scanning direction. Depending on the direction of rotation, the screw 27 and the sliding rod 28 are displaced in the same axial direction, thereby displacing the glass holder 21, thereby allowing the contact glass 5 to rotate together with the document 4 about the fulcrum shaft 8. .

Furthermore, a fourth embodiment of the present invention will be described based on FIGS. 6 to 12. Figures 6 and 7 are partial longitudinal side views, and as is clear from these figures, the top cover 3
A lid 30 is held on the top surface of the lid 30 via a support shaft 31 so as to be able to rise and fall freely. The lid 30 is provided with a document presser 34 consisting of a bat mounting plate 32 and a pad 33 fixed to the bat mounting plate 32. The document presser 34 is urged toward the support shaft 31 by a spring 35, and is slidably and rotatably supported by the lid 30. This support structure will be described later. Opening 3a of top cover 3
The contact glass 5 attached to the contact glass 5 has a document abutting plate 36 on the top surface of one end. A rubber 37 that contacts the contact glass 5 and the original 4 is fixed to one end edge of the document abutment plate 36, and protrusions 38 are formed on both sides of the other edge. Further, presser plates 39 that press both sides of the upper surface of the document abutting plate 36 are screwed to the top cover 3, and arc-shaped holes 41 that engage with the bins 40 protruding from these presser plates 39 are provided on the document abutting plate 36. is formed. Furthermore, the top cover 3 has a pair of left and right gears 42.
are fixed to operating shafts 43 that rotate with horizontal axes, and a pair of left and right racks 44 meshed with these gears 42 are urged upward and supported by the protrusion 38 so as to be vertically movable. Projections 45 for pressing the rack 44 are formed on both sides of the lower surface of the lid 30.

Next, a support structure for the document presser 34 is shown in FIG. A triangular hole 46 is formed in the bat mounting plate 32, and a fulcrum shaft 47, which is a fulcrum portion, projects downward from the triangular hole 46 and is erected in the lid 30.
are fitted, and a retaining ring 49 is secured. Then, the spring 35 is attached to the butt mounting plate 32.
By pulling the center of the fulcrum shaft 47, the fulcrum shaft 47 is elastically abutted against the two sides of the V-shape of the triangular hole 46, and the triangular hole 46 is moved along the straight line on which the biasing force of the spring 35 acts.
Since the butt mounting plate 32 is formed in a bilaterally symmetrical shape, normally both side edges of the butt mounting plate 32 are parallel to the sub-scanning direction, and the end edges are maintained parallel to the main scanning direction.

9 and 10 show the document abutting plate 36, and as is clear from these figures, the projecting piece 38 is formed with a square hole 50 into which the rack 38 is fitted. A guide shaft 51 that guides the rack 44 in a vertically movable manner.
are erected, and a spring 5'2 for urging the rack 44 upward is wound around these guide shafts 51. Also,
The arcuate hole 41 is formed on a circumference having a radius around the fulcrum portion 54 which is the center of the document abutting plate 36 . Further, the document abutment plate 36 is moved by the support shaft 3 by springs 53 stretched on both sides thereof and on both sides of the top cover 3.
1 side, and as a result, a part of the top cover 3 (
It is in contact with one side 3ba) of the opening that holds the contact glass 5 (see FIG. 6). Note that a knob (not shown) protruding from both outer sides of the housing 1 is attached to the outer end of the operating shaft 43.

In such a configuration, as shown in FIG. 6, when the lid 30 is closed, the rack 44 is pushed down by the protrusion 45 and engaged with the gear 42 (see FIG. 12). Then, when the image of the document 4 is read and the reading line in the main scanning direction is tilted with respect to the straight line perpendicular to the sub-scanning direction, grip the knob and turn the operating shaft 43 to rotate both or one of the left and right gears 42. When rotated in either direction, the rack 44
moves, so the original abutting plate 36 rotates together with the contact glass 5 using the fulcrum 54, and the original presser 34, which abuts the edge of the original abutting plate 36 with the edge of the pad 37, also springs about the fulcrum shaft 47. It rotates by a biasing force of 35. Therefore, since the contact glass 5 and the document holder 34 rotate while holding the document 4, the lid 3
The curvature of the original 4 can be corrected without opening the original 4.

Then, when the lid 30 is raised to set the next document 4, the rack 44 is released from the protrusion 45 and moves upward by the biasing force of the spring 52 and away from the gear 42, as shown in FIG. (Refer to FIG. 11) As a result, the contact glass 5 comes into contact with one side 3b of the opening of the top cover 3 while rotating in the return direction about the fulcrum part 54 by the biasing force of the spring 53 together with the original abutting plate 36. .

Also, since the bat 33 separates from the document 4, the document presser 3
4 also returns to a state in which both sides are parallel to the sub-scanning direction due to the biasing force of the spring 35.

Effects of the Invention Since the present invention is constructed as described above, when the reading line of the original in the main scanning direction is not perpendicular to the sub-scanning direction, the contact glass holding the original and the original holder are moved around the fulcrum part. By rotating the document holder, it is possible to accurately correct the posture of the document without releasing the document holder. Furthermore, it is possible to correct the position of the document accurately without releasing the document holder. Furthermore, it is possible to correct errors in the mounting accuracy of the scale or document abutment plate against the contact glass, or to prevent errors in the normal sub-scanning direction Even if there are assembling variations such as errors in the moving direction of the optical unit relative to the original, it is possible to correct the curvature of the document, which has the effect of facilitating assembly and adjustment work.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a partially cutaway exploded perspective view, FIG. 2 is a plan view showing the rotational movement of the contact glass, and FIG. 3 and 4 show a second embodiment of the present invention, where FIG. 3 is an exploded perspective view, FIG. 4 is a plan view showing the rotational movement of the contact glass, and FIG. 5 is a second embodiment of the present invention. An exploded perspective view showing a third embodiment,
6 to 12 show a fourth embodiment of the present invention, in which FIG. 6 is a partially sectional and enlarged side view showing the state in which the original is set, and FIG. Fig. 8 is a partially exploded perspective view showing the supporting structure of the original holder, and Fig. 9 shows the original abutment plate and rack. FIG. 10 is an enlarged perspective view of one side of the document abutting plate; FIGS. 11 and 12 are partial side views showing the vertical movement of the rack; FIG. 13 18 to 18 show conventional examples. FIG. 13 is a perspective view, FIGS. 14 and 15 are plan views of a contact glass, FIG. 16 is a plan view of an original, and FIG. 17 is a view of a tilted original. FIG. 18 is an explanatory diagram showing a part of the image. FIG. 18 is an explanatory diagram showing a state in which a read image of a tilted original is output. 4... Original, 5... Contact glass, 6... Original holder, 8... Fulcrum part, 34... Original holder, 54...
...Fully point Ji, I Figure]ZF, %6 ring] Figure 7

Claims (1)

[Claims] In an optical document reading device in which a document placed on a transparent contact glass is held down by a document presser that can freely rise and fall, and an optical unit is moved in a sub-scanning direction along the contact glass, the contact glass and the document presser are connected to each other. An optical document reading device characterized in that a fulcrum portion is provided to support the two components rotatably in a plane direction.