JP2653902B2 - Document cassette - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a document cassette for holding a read document from which image information is read by an image reading device.

[Prior Art] In the fields of printing and plate making, an image scanning reading and reproducing system for electrically processing image information carried on an original to create a film master for the purpose of streamlining work processes, improving image quality, etc. Used.

In an image reading apparatus constituting this system, a read document positioned and accommodated in a document cassette is conveyed to a reading section, and the reading section performs main scanning while sub-scanning and conveying the document cassette, thereby two-dimensionally reading image information. Has been done.

That is, at least one of the read originals, which is surrounded by the frame, is held between the transparent support plates, and the reading unit transmits reflected light or transmitted light from the read originals to the CC.
Image information is read by photoelectric conversion by a photoelectric conversion element such as D.

[Problems to be Solved by the Invention] When a document cassette is inserted into the image reading apparatus from a different direction or in an inverted state, it cannot be detected easily and reliably. For this reason, there is a problem that image information is read in a state where the front and back of the read document are different or the position thereof is shifted, and an accurate reading operation is not performed.

The present invention is intended to solve this kind of problem,
An object of the present invention is to provide a document cassette which can easily and surely detect erroneous loading of a document cassette containing a document to be read and has a simple configuration.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a frame surrounding a read original, penetrating from one surface to the other surface, and selectively setting a light non-transmitting state. A plurality of identification holes, and a second signal that passes through at least one of the identification holes by passing the first signal from the one surface to the other surface and passing the first signal therethrough. And a detection hole for penetrating from the one surface to the other surface,
The signal passes and any of the identification holes
And a confirmation hole for detecting that the read original is not in a desired posture when a signal does not pass.

[Operation] In the document cassette of the present invention as described above, when the document cassette is loaded in a desired posture, the first signal passes through the detection hole and the second signal passes through the identification hole. On the other hand, if the original cassette is erroneously loaded, the first signal passes through the confirmation hole and the second signal does not pass through the identification hole. Therefore, it is possible to easily and reliably detect whether or not the original cassette is loaded in a desired posture.

Embodiment An embodiment of the document cassette according to the present invention will be described below in detail with reference to the accompanying drawings.

1 and 2, reference numeral 10 denotes a document cassette according to the present embodiment. The document cassette 10 has a substantially rectangular shape, a frame 12 surrounding the document S to be read, a support glass plate 16 and a cover glass plate disposed in a rectangular opening 14 formed in the center of the frame 12. 18 and this frame
12, identification holes 20a to 20n that penetrate from one surface to the other surface and are selectively made non-transparent, and penetrate from the one surface to the other surface, When a signal (to be described later) passes, the identification holes 20a to 2
0n, and a detection hole 22 for detecting a second signal (to be described later) that has passed through at least one of the first and second surfaces. Confirmation holes 24a to 24c for detecting that the read original S is not in a desired posture when the second signal does not pass through any of the identification holes 20a to 20n.

V-shaped grooves 26a and 26b are formed on both sides of the frame 12 along the transport direction (the direction of the arrow X).
An identification hole 20a is provided at one end side where the cover glass plate 18 is supported.
20n, a detection hole 22 and a confirmation hole 24a are formed, and confirmation holes 24b and 24c are formed on the other end side. The detection hole 22, the confirmation hole 24c, and the confirmation hole 24a
Reference numeral 24b is located on the same line in the transport direction of the document cassette 10 (the direction of the arrow X) and is separated from the center line O of the document cassette 10 by the same distance H (see FIG. 2).

On the other end side of the frame 12, grooves 27a and 27b are provided, and a stopper member 28 is provided between the grooves 27a and 27b so as to be able to advance and retreat, and the stopper member 28 is fixed to the cover glass plate 18. Engage with the locking portion 30.

The identification holes 20a to 20n are used to identify the type of the document S to be read and the number of the document cassette 10, and a label is used to selectively set the identification holes 20a to 20n in a light non-transmission state. 32 is used.

Next, an image reading apparatus into which the above-described original cassette 10 is loaded will be described.

In FIG. 3, reference numeral 40 indicates an image reading device,
A cassette attaching / detaching portion 44 is provided at one upper end side of a housing 42 constituting the image reading device 40, and is held by the cassette detecting sensor 46, the original cassette 10, and the original cassette 10 near the cassette attaching / detaching portion 44. An identification mechanism 48 for identifying the type of the read original S and an identification mechanism driving sensor 50 are provided.

As shown in FIG. 4, the identification mechanism 48 includes a light emitting unit 52 and a light receiving unit
Has 54. The light emitting unit 52 and the light receiving unit 54
It includes an LED 1 and a phototransistor PT1 arranged corresponding to the ten detection holes 22, and LEDs 2a to 2n and phototransistors PT2a to 2n arranged corresponding to the identification holes 20a to 20n.

As shown in FIG. 3, the transport mechanism is provided near the identification mechanism 48.
One end of the transfer mechanism 60 is provided, and the other end of the transport mechanism 60 extends above a rotary table described later. The transport mechanism 60 includes a plurality of guide rollers 62 having an arcuate cross section and engaging with the V-shaped grooves 26a and 26b of the document cassette 10, and a plurality of transport rollers 64 abutting on the upper surface of the frame 12 of the document cassette 10. The transport roller 64 is rotationally driven by a rotational drive source 66.

A document table 70 is provided below the transport mechanism 60 via a sub-scanning mechanism 72 so as to be able to advance and retreat in the sub-scanning direction (the direction of arrow X). The sub-scanning mechanism 72 includes a rotary drive source 74, and displaces the document table 70 in the direction of arrow X by a ball screw 76 connected to the rotary drive source 74.

In the document table 70, the document cassette 10 is trimmed,
That is, a trimming mechanism 78 is provided for performing a forward / backward displacement in a direction orthogonal to the sub-scanning direction (the arrow X direction). The trimming mechanism 78 includes a rotary drive source 80 attached to the document table 70.
The ball screw 82 connected to the rotary drive source 80 is fitted to a nut member (not shown) provided on the trim base 84.

The trim base 84 is provided with a rotation mechanism 86 for rotating the document cassette 10 by a predetermined angle, and a positioning mechanism 90 for positioning and holding the document cassette 10 on a rotation table 88 constituting the rotation mechanism 86.

The positioning mechanism 90 includes a rotation drive source 92 fixed to the lower surface side of the trim base 84, and rotates the locking plate 96 via a cam plate 94 that is engaged with a rotation shaft of the rotation drive source 92. The document cassette 10 is positioned and fixed.

A light source 98 constituting the transmission illumination mechanism is indicated by an arrow X in the housing 42.
The light source 98 extends below the light source 98 in the main scanning direction substantially orthogonal to the direction.
An image reading unit 100 that photoelectrically reads the image is provided. The image reading unit 100 includes an imaging lens 104 that can move forward and backward in the optical axis direction under the driving action of a rotary drive source 102, and a photoelectric conversion that can move forward and backward with respect to the imaging lens 104 under the driving action of a rotary drive source 106. Part 1
08 and. This photoelectric conversion unit 108 includes CCDs 110a to 110c.
Each of the CCDs 110a to 110c photoelectrically reads the color image information carried on the read original S as image information corresponding to each of R, G, and B colors.

Next, the operation of the thus configured document cassette and the image reading apparatus in which the document cassette is loaded will be described.

First, in FIG. 1, after a desired original S to be read is placed on the support glass plate 16, the cover glass plate 18 is rotated to engage the locking portion 30 with the stopper member 28.

When the original cassette 10 is inserted into the image reading device 40 from the cassette attaching / detaching portion 44, the cassette detection sensor 46 is driven, whereby the original cassette 10 is transported by the transport roller 64 under the driving action of the rotary drive source 66. Loading is started.
Next, when the leading end of the document cassette 10 passes through the identification mechanism 48 and reaches the identification mechanism driving sensor 50, the identification mechanism 48
Starts the operation of identifying the original cassette 10 by.

That is, the illumination light (second signal) is emitted from the LEDs 2a to 2n of the light emitting unit 52 constituting the identification mechanism 48 to the identification holes 20a to 20n of the document cassette 10, and the identification holes 20a to 20n are emitted.
Among the phototransistors PT2a to PT2n, the illumination light that has passed through the hole in which the label 32 is not provided reaches a predetermined one of the phototransistors PT2a to PT2n.

At that time, the illumination light (first signal) emitted from LED1
By passing through the detection hole 22 of the document cassette 10 and reaching the phototransistor PT1, the phototransistor P
Latch signals from T2a to 2n. As a result, the operation of confirming the type of the document S to be read and confirming the number of the document cassette 10 is assured.

Next, guide rollers 62 constituting the transport mechanism 60 are engaged with the V-shaped grooves 26a and 26b of the document cassette 10, and the transport rollers 64 are rotated in contact with the upper surface of the frame 12, whereby the document cassette is rotated. 10 is transported to the turntable 88.

Then, the rotation drive source 92 constituting the positioning mechanism 90 is driven, and the locking plate 96 is pressed against the end face of the document cassette 10 via the cam plate 94, whereby positioning is performed. Further, the rotating mechanism 86 is driven as necessary to adjust the angular position of the read document S held in the document cassette 10. Further, in order to perform trimming of the read original S, the trim base 84 is displaced in a direction substantially orthogonal to the sub-scanning direction (arrow X direction) under the driving action of a rotary drive source 80 constituting a trimming mechanism 78 as necessary. The trimming operation of the read original S is performed mechanically.

After the document cassette 10 is positioned with respect to the platen 70,
The rotation drive source 74 constituting the sub-scanning mechanism 72 is driven, the document table 70 is conveyed in the sub-scanning direction (the direction of the arrow X) under the rotation of the ball screw 76, and the light source 98 is energized. Therefore, the illumination light L derived from the light source 98 is transmitted through the read original S in the main scanning direction, so that the read original S
Is taken out as an optical signal, and the image information as the optical signal is applied to each of the CCDs 110a to 110c via a predetermined imaging lens 104 arranged on the optical axis. Thus, the color image information as the optical signal is photoelectrically read in correspondence with each of R, G, and B colors. During this time, the original table 70 is being conveyed in the sub-scanning direction in the direction of arrow X, and the read original S is two-dimensionally illuminated by the illumination light L to extract its color image information.
All data will be read by a to 110c.

After the reading operation of the read original S is completed, the positioning mechanism 90
Is released, and the document cassette 10 is again drawn out of the cassette attaching / detaching portion 44 under the driving action of the rotary drive source 66 constituting the transport mechanism 60.

In this case, in the present embodiment, since the confirmation holes 24a to 24c are provided in the frame 12 corresponding to the detection holes 22, it is possible to easily and reliably detect the erroneous loading of the document cassette 10. Can be.

That is, when the original cassette 10 is loaded into the image reading device 40 from the cassette attaching / detaching portion 44 in an inverted state, the LED 1 and the LEDs 2a to 2n of the light emitting portion 52 constituting the identification mechanism 48 and the phototransistors PT1 and Illumination light L is applied to the PTs 2a to 2n. Here, the illumination light (first signal) reaches the phototransistor PT1 from the LED1 through the confirmation hole 24a, but the illumination light does not irradiate any of the phototransistors PT2a to 2n from the LEDs 2a to 2n. .

When the document cassette 10 is loaded into the image reading device 40 with its front and back reversed, that is, in the direction of the arrow Y in FIG. 1, the phototransistor P is moved from the LED 1 through the confirmation hole 24b.
When the illumination light (first signal) arrives at T1 and is further inverted and directed in the direction of arrow Y and loaded into the image reading device 40, the illumination light (LED1) is transmitted from the LED1 to the phototransistor PT1 via the confirmation hole 24c. The first signal arrives.

Therefore, when the original cassette 10 is loaded into the image reading device 40 in a position other than the desired posture, the phototransistors PT2a to PT2n
Are not irradiated with the illumination light (second signal), and an effect that the erroneous loading of the original cassette 10 can be detected automatically and reliably is obtained. As a result, the color image information carried on the read original S is read with high precision, and an efficient image reading operation is performed.

If confirmation holes are formed on both sides of the frame 12, misloading can be automatically detected even when the document cassette 10 is loaded in the direction of arrow Z in FIG. .

[Effects of the Invention] As described above, the original cassette according to the present invention has the following effects and advantages.

When the original cassette is loaded in a desired posture, the first
While the signal passes through the detection hole and the second signal passes through the identification hole, if the original cassette is incorrectly loaded, the first signal passes through the confirmation hole and the second signal passes through the confirmation hole. It does not pass through any of the identification holes. Therefore, it is possible to automatically and reliably detect whether or not the original cassette is loaded in a desired posture, thereby performing an efficient image reading operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of a document cassette according to the present invention, FIG. 2 is a plan view of the document cassette, FIG. 3 is a vertical sectional view of an image reading apparatus for loading the document cassette, and FIG. FIG. 3 is an explanatory diagram of a configuration of an identification mechanism of the reading device. 10 Document cassette 12 Frame 18 Cover glass plate 20a to 20n Identification hole 22 Detection hole 24a to 24n Confirmation hole 40 Image reading device 48 Identification mechanism 52: Light emitting unit 54: Light receiving unit

Claims (1)

(57) [Claims] 1. A plurality of identification holes that penetrate from one surface to the other surface and are selectively made non-light-transmitting in a frame surrounding a document to be read; And a detection hole for holding a second signal that has passed through at least one of the identification holes by passing the first signal through the surface, and a surface from the one surface to the other surface. And a confirmation hole for detecting that the read original is not in a desired posture when the first signal passes therethrough and the second signal does not pass through any of the identification holes. A document cassette, comprising: