JP3037545B2 - Document input device frame structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of a document input device (image scanner), and more particularly to a document input device capable of both document fixing and document moving reading, in which a mechanical frame and a base frame are integrated with a resin material. The present invention relates to a frame structure of a document input device which ensures the required accuracy of image reading with a resin frame formed as described above.

[0002]

2. Description of the Related Art As shown in a front view of FIG. 6 and a vertical sectional view of FIG.
And was formed by. The top plate 4 on which the glass plate 3 on which the original is placed is attached to the mechanical frame 1, and the reading unit 5 for reading the original is slidably attached to a carrier shaft 6 provided in the mechanical frame 1. The glass plate 3 on which a document is placed is also supported by a driven rail 7 provided on the mechanical frame 1.
And the reading unit 5 is kept parallel.

[0003]

As described above, the frame structure of the conventional document input device is structured such that the top plate 4 to which the document placing glass plate 3 is attached and the reading unit 5 for reading the document are separated. As shown in FIG. 9, the degree of parallelism between the surface of the glass plate 3 and the reading unit 5 and the perpendicularity between the reading unit 5 and the carrier shaft 6 must be guaranteed within the required accuracy as shown in FIG. Therefore, it is necessary to provide an adjustment structure or to form a mechanical frame in which the side plate 8 and the frame rod 9 called a channel shown in the conventional mechanical frame structure explanatory diagram of FIG. .

As a result, the cost of the frame of the document input device has been high, and the adjustment process in the manufacturing process has been difficult. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a frame structure of a document input device which is easy to manufacture and which can ensure the required accuracy of image reading with a resin frame. The purpose is.

[0005]

In order to solve the above-mentioned object, a frame structure of a document input device according to the present invention comprises a base frame constituting an outer frame, a mechanical frame installed on the base frame, and a mechanical frame. In the frame structure of a document input device having a reading unit guided by a carrier shaft and a driven rail provided on a frame, and a top plate having a glass plate for document placement in a central opening, A frame formed by integrating a frame and a mechanical frame into a resin molded frame, the carrier shaft and the driven rail are disposed on the resin molded frame, and a top plate provided with a glass plate at the central opening is provided. Folded side plates are formed on both sides, and both sides of the bent side plates are engaged with the carrier shaft in the main scanning direction Y in which the reading unit moves. A metal top plate provided with an engaging portion for positioning in the angular sub-scanning direction X and the document reading direction Z is fixed to the resin molding frame by engaging with a carrier shaft. The paper feed unit is provided on the top plate.

[0006] The driven rail may be fixed to the glass plate, and the reading unit may be formed with an engaging portion for engaging with the driven rail.

[0007]

The base frame and the mechanical frame are integrated into a resin-molded frame, and the document is read in the sub-scanning direction X perpendicular to the main scanning direction Y in which the reading unit moves by engaging with the carrier shaft provided on the resin-molded frame. With the metal top plate provided with the engaging portion for positioning in the direction Z, required accuracy such as the degree of parallelism between the document surface and the reading unit is guaranteed, and the manufacturing is facilitated.

[0008]

FIG. 1 is an exploded perspective view showing an embodiment of a main part of the present invention. In FIG. 1, reference numeral 11 denotes a resin molded frame, and a base 12 and a frame 13 are integrally formed. The resin molded frame 11 in which the base 12 and the frame 13 are integrated corresponds to the base frame 2 and the mechanical frame 1 shown in FIG.

As shown in the drawing, two holes 14 are formed in the frame 13 of the resin molded frame 11, and the driven rail 7 is fixed inside the frame 13 of the resin molded frame 11. The carrier shaft 6 is mounted in the hole 14 formed in the frame 13 of the resin molding frame 11.

An original placing glass plate 3 is attached to the lower end surface of a metal top plate 4 having bent side plates 15 at both ends and having a central portion opened by, for example, a double-sided tape or the like. The top plate 4 is fixed to the frame 13 of the resin molded frame 11 with screws. At the time of fixing the top plate 4, the notch 16 shown in FIG. 2 provided in each bent side plate 15 is fitted into the carrier shaft 6, and the top plate 4 traces the carrier shaft 6, that is, slides. It is a structure attached to. A reading unit 5 for reading a document is slidably mounted on a carrier shaft 6.

Since the top plate 4 is formed of a completely connected metal strength member except for the opening provided at the center thereof, the required accuracy shown in FIG. 3 and the perpendicularity between the reading unit 5 and the carrier shaft 6 can be easily assured.

At the position of one end on the top plate 4, an automatic paper feed unit 18 is installed as shown in the external perspective view of the original input device using the present invention in FIG. In FIG. 4, a document supplied from a paper feed tray 19 is conveyed into the automatic paper feeding unit 18 and the document is read by the automatic paper feeding unit 18. Then, the read document is discharged to the discharge tray 20.

The automatic paper feed unit 18 at the time of moving and reading the original reads the original as follows. That is, as shown in FIG. 3, one document is separated and conveyed by the separation pad 21 and the big roller 22, and the conveyance rollers 23, 2
The document is sent to the top plate 4 where the reading unit 5 is located via the reading unit 4. Since the glass plate 3 is provided at the center of the top plate 4, the conveyed document is read by the reading unit 5 through the glass plate 3.

At this time, the distance between the glass plate 3 from which the conveyed document is read and the reading unit 5, that is, the optical path length is always constant, and the top plate 4 is regulated by the carrier shaft 6. The image reading accuracy is almost the same as that in the case of the moving original fixed, and the required accuracy shown in FIG. 9, that is, the parallelism between the surface of the original mounting glass plate 3 and the reading unit 5 and the reading unit 5 and the carrier shaft 6 can be easily guaranteed.

FIG. 5 is an explanatory view of the structure of a top plate according to another embodiment of the present invention. In the figure, a driven rail 25 is fixed to one side of the glass plate 3 as shown in the figure, and an engagement portion 26 that engages with the driven rail 25 is formed in the reading unit 5. As described with reference to FIGS. 1 and 2, the carrier shaft 6 is slidably mounted on the reading unit 5.

In this case, the reading unit 5 is
5 moves along the glass plate 3 so that the glass plate 3 serves as a position reference in the document reading direction Y, and the image reading accuracy is far greater than that of the frame 13 of FIG. It will be improved.

[0017]

As described above, according to the present invention, the case of claim 1 has the following effects. By integrating the conventional mechanical frame and base frame with a resin molded frame, significant cost reduction can be achieved. Since the top plate traces (slids) the carrier shaft (reading line), it is easy to guarantee the required accuracy for skew and offset of the document. By fitting the integrated top plate onto the carrier shaft, no adjustment work is required, leading to a stable manufacturing process. Since the top plate always follows the carrier axis, it is less likely to be affected by disturbance such as a floor surface. By mounting the automatic sheet feeding unit on the top plate, the relative position with respect to the original rotating side can be assured, so that the skew and offset deviation of the image between the original fixed reading and the original moving reading are reduced. Significant weight reduction is possible due to the integral resin molding of the mechanical frame and base frame.

The second aspect has the following effect in addition to the effect of the first aspect. By mounting the driven rail on the top plate,
It is easier to guarantee the accuracy in the document reading direction Y than in the case of Therefore, it is less likely to be affected by disturbance such as a floor surface. Since the precision in the height direction of the resin molded frame can be reduced, the cost of the resin molded frame can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of one embodiment of a main part of the present invention.

FIG. 2 is an explanatory view showing the insertion of a carrier shaft.

FIG. 3 is a side view of an embodiment illustrating a portion for moving and reading an original;

FIG. 4 is an external perspective view of a document input device in which the present invention is used.

FIG. 5 is an explanatory view of a configuration of a top plate according to another embodiment of the present invention.

FIG. 6 is an explanatory front view of a frame of a document fixing section of a conventional document input device.

FIG. 7 is a longitudinal sectional view thereof.

FIG. 8 is an explanatory view of a conventional mechanical frame structure.

FIG. 9 is an explanatory diagram of required accuracy of the document input device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 glass plate 4 top plate 5 reading unit 6 carrier shaft 7 driven rail 11 resin molded frame 12 base 13 frame 15 side plate 16 notch 18 automatic paper feed unit 25 driven rail 26 engaging portion

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/00

Claims (2)

(57) [Claims] 1. A base frame constituting an outer frame, a mechanical frame installed on the base frame, a reading unit guided by a carrier shaft and a driven rail arranged on the mechanical frame, and a central opening. In a frame structure of a document input device having a top plate having a document mounting glass plate, a resin molded frame in which the base frame and the mechanical frame are integrated, and the carrier shaft and the carrier shaft are attached to the resin molded frame. A top plate provided with a driven rail and having a glass plate at the central opening, wherein bent side plates are formed on both sides of the top plate, and both sides of the bent side plate are connected to the carrier shaft. A metal unit provided with an engaging portion for positioning in a sub-scanning direction X perpendicular to the main scanning direction Y and a document reading direction Z in which the reading unit moves. A frame structure of a document input device, wherein a top plate is fixed to said resin molded frame by engaging with a carrier shaft, and an automatic paper feed unit for reading and moving the document is provided on said top plate. 2. A base frame constituting an outer frame, a mechanical frame installed on the base frame, a reading unit guided by a carrier shaft and a driven rail arranged on the mechanical frame, and a central opening. In a frame structure of a document input device having a top plate having a document mounting glass plate, a resin molded frame in which the base frame and the mechanical frame are integrated, and the carrier shaft is attached to the resin molded frame. A top plate having a glass plate at the central opening, wherein bent side plates are formed on both sides of the top plate, and both sides of the bent side plate are engaged with the carrier shaft and read. The metal top plate provided with an engaging portion for positioning in the sub-scanning direction X and the document reading direction Z perpendicular to the main scanning direction Y in which the unit moves is The glass molding plate is engaged with and fixed to the carrier frame, the driven rail is attached to the glass plate, and the reading unit is formed with an engaging portion to be engaged with the driven rail. A frame structure of the document input device, wherein a paper unit is provided on the top plate.