JPH01291237A - Copying machine with document size detecting function - 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 This invention relates to a copying machine having a function of detecting the size of a document.

11 A copying machine having a function of detecting the document size is disclosed in, for example, Japanese Patent Application Laid-Open No. 62'-265642.

However, in this type of copying machine, a photosensor detects the size of the original using scattered reflected light from the original placed on the original glass. This has the following drawbacks.

■ Accurate document detection may not be possible depending on the color and shading of the document.

■ If the original cover is completely closed, the photo sensor will mistakenly detect the bottom surface of the original cover and the original.

■ Since the original cover is left open, detection errors are likely to occur due to external light.

■ The document itself may have colors and shading that cause a document detection error. For example, if it is black, the reflectance is low and it is difficult to detect.

Also, if it is red, it cannot be detected by the LED.

Furthermore, even if the surface of the document is white, a detection error will occur.

Korikai! SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine that has a function of reliably detecting the size of a document regardless of its color, shading, etc.

11 rows” [ The invention is summarized in the claims.

・Hands for doing The copying machine of the present invention also includes Image Skillena.

Please refer to FIGS. 1-3.

The document placement section 2 places documents 3 of various sizes.

The document holding section 1 overlaps the document placing section 2 and presses down the document 3.

Multiple sets of light emitting parts and light receiving parts are provided. The light-emitting section is disposed on either the document placing section 2 or the document holding section 1, and emits light toward the other of the document placing section 2 and the document holding section 1. In the embodiment shown in FIGS. 1 to 3, the light emitting section 4 is provided in the document holding section "1".

The light receiving section 5 is arranged on the other side and receives the light emitted from the light emitting section 4. In the embodiment shown in FIGS. 1 to 3, the light-receiving section 5 is provided in the document placement section 2. In the embodiment shown in FIGS. A plurality of sets of the light emitting section 4 and the light receiving section 5 are arranged near the ends of documents 3 of various sizes placed on the document placement section 2.

The presence or absence of the original 3 is determined by shining light near the edge of the one-plate original 3 and the intensity of the light entering the light receiving section 3 to detect the original size.

Branch aLILL Please refer to FIGS. 1 and 2.

The copying machine with an original size detection function according to the present invention includes an original holding part 1, an original placing part 2, a light receiving part 5, and a light emitting part 4.

The document placement section 2 has, for example, a transparent document surface glass 12 . A document 3 is placed on the document placement section 2, and the document holding section 1 overlaps with the document 3. The manuscript 3 is, for example, B shown in FIG.
5. B4゜A4. Includes A3 size originals 38 to 3d.

The light receiving section 5 is provided below the document surface glass 12 of the document placing section 2 . The light emitting section 4 is provided in the document holding section 1. When the light emitting section 4 is provided on the document holding section 1 side in this way,
Since the light emitted from the light emitting section 4 is emitted downward, the light from the light emitting section 4 does not directly enter the operator's eyes.

FIG. 3 shows an example of the arrangement of the light receiving section 5 and the light emitting section 4.

The light receiving unit 5 includes four light receiving sensors 5 such as photosensors.
a"-5d. The light emitting section 4 has four light emitting diodes 4a to 4d. When the document holding section 1 is closed and holding down the document 3 as shown in FIG. Light receiving sensor 5
A to 5d are arranged corresponding to the light emitting diodes 48 to 4d, respectively. The light emitting diodes 4a to 4d emit light to the corresponding light receiving sensors 5a to 5d, respectively.

As shown in FIG. 3, the light receiving sensor 5a and the light emitting diode 4a are arranged to detect the vicinity of the edge 3a-1 of a B5 size document. The light receiving sensor 51] and the light emitting diode 4b are arranged to detect the vicinity of the edge 3b-1 of an A4 size document.

The light receiving sensor 5C and the light emitting diode 40 are arranged so as to detect an area of 3 cm1 near the edge of a B4 size document. The light receiving sensor 5d and the light emitting diode 4d are arranged to detect the vicinity of the edge 3d-1 of an A3 size document. That is, the light receiving sensors 5a to 5d are located below the edge of each document.

Please refer to FIG.

When the amount of light received by the light receiving sensors 5a to 5d becomes less than a predetermined amount of light, a light emitting diode 14. a~4d
The light-receiving sensors 5a to 5d are configured to send detection signals to the determination device 30 as if the light had hit them. Further, the switch 20 is configured to detect that the document holding section 1 is closed as shown in FIG. 2 and send a detection signal to the determination device 30. This switch 20 is, for example, a touch sensor.

The determination device 30 can output no command to the document size display section 40, paper selection section 50, and magnification setting section 60 based on the detection signal of the combination switch 20 together with the detection signals of the light receiving sensors 5a to 5d.

JL Please refer to FIGS. 3 and 5.

The determining device 30 determines the document size based on a combination of detection signals from the light receiving sensors that do not receive a predetermined amount of emitted light among the light receiving sensors 5a to 5d.

For example, in FIG. 3, when a B5 size original 3a is placed and the original holding unit 1 is closed, the light emitting diode 4a
The light hits the vicinity of the edge 3a-1 of the original 3a. The light from the light emitting diode 4a passes through the vicinity of the edge 3a-1 of the document 3a and is received by the light receiving sensor 5a.

When the document 3a is thick, the light from the light emitting diode 4a is not received by the light receiving sensor 5a. ) At this time, the detection signal of the light receiving sensor 4a is sent to the determination device 30. Since the original holding unit 1 is closed, the switch 20 is turned on and a detection signal is sent from the switch 20 to the determination device 30.

In this state, the determination device 30 detects the size of the document 3a. Then, in response to the command from the determination device 30, the original size display section 40 displays the original size B5, the paper selection section 50 selects the B5 paper, and the magnification setting section 60 sets a predetermined magnification.

When a predetermined number of copies have been made, the document retainer 1 is opened and the switch 20 is turned off. This cancels the size display, paper selection, and magnification setting.

-〇- Next, when an A4 size original 3b is placed instead of the original 3a and the original holding unit 1 is closed, the light from the light emitting diode 41) hits the vicinity of the edge 3b-1 of the original 3b. The light from the light emitting diode 4b passes through the vicinity of the edge 3b-1 of the original 3b and is received by the light receiving sensor 5b. Similarly, the light from the light emitting diode 4a also passes through the document 3b and is received by the light receiving sensor 5a.

(If the document 3b is thick, the light from the light emitting diodes 4a, 4b is not received by the light receiving sensors 5a, 5b.) At this time, the detection signal is transmitted from the light receiving sensors 5b, 5a to the determination device 30.
sent to.

In this case, the determination device 30 determines that A4
This allows the size of the original document 3b to be detected. The subsequent determinations are the same as those for the B5 size document 3a.

Next, when an 84 size original 3C is placed, a detection signal is similarly sent to the light receiving sensor 5c.

5a to the determination device [30. In this case, the determination device 30 can detect the 84-size original 3C from the combination of the detection signals from the light receiving sensors 5C and 5a and the detection signal from the switch 20. The subsequent determinations are the same as those for the B5 size document 3a.

Next, when an A3 size document 3d is placed, detection signals are sent to the determination device 30 from the light receiving sensors 5a to 5d.

In this case, the determination device 30 can detect the A3 size document 3d from the combination of detection signals from the light receiving sensors 5a to 5d and the detection signal from the switch 20.

The subsequent determinations are the same as those for the B5 size document 3a.

Support mJLL FIG. 6 shows a second embodiment.

A light emitting section 104 is provided in the document holding section 101 .

The original platen 102 has an original glass 112 and a light receiving section 10.
5 is provided.

The light-receiving sensors 105a to 105d of the light-receiving unit 105 detect a B5-sized original 3a and an A4-sized original 3b, respectively.
, B4 size original 3c and A3 size original 3d
They are located near the ends 3a-1, 3b-1, 3cm1, 3d-1. Light emitting diode 1048 of light emitting section 104
104d correspond to the light receiving sensors 105a to 105d when the original holding unit 101 is closed.

By the way, in the embodiments shown in FIGS. 3 and 6, the light emitting section 4
．． 104 may be provided on the document placement section, and the light receiving section 5.105 may be provided on the document holding section.

Note that this invention can also be applied to image scanners and the like.

l Gloss 11 As explained above, according to the present invention, ■ Since the vicinity of the edge of the document is detected using transmitted light, the color of the document itself,
Originals can be detected without being affected by shading.

■ Documents can be detected with the document holding lid closed, so they are not affected by external light.

[Brief explanation of the drawing]

Embodiment 1 of the present invention is shown in FIG.
The figure shows the state in which the original holding unit is closed, Figure 3 is a perspective view of the copying machine, Figure 4 is a block diagram of the processing system, Figure 5 is a flowchart showing the operation, and Figure 6 is a diagram of the copying machine. FIG. 3 is a perspective view showing Example 2. 1・・・・・・・・・・・・・・・・・・・・・・・・
・・・Manuscript holding part 2・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・Manuscript placement part 3・・・・・・・・・
・・・・・・・・・・・・・・・・・・Manuscript 3a-1
~3d-1... Near the edge of the document 4...
・・・・・・・・・・・・・・・・Light emitting part 4a~4
d・・・・・・・・・・・・・・・Light-emitting diode 5・
・・・・・・・・・・・・・・・・・・・・・・・・
・Light-receiving parts 5a to 5d・・・・・・・・・・・・・・・Light-receiving sensor Attorney Patent attorney 1) Side
Tetsuko i Figure 6

Claims (1)

[Scope of Claims] A document placement section for placing documents of various sizes; and a document holding section that overlaps the document placement section and holds down the document, the document placement section and the document holding section. a light emitting section disposed on either one of the document placement section and the document holding section and emitting light toward the other of the document holding section; and a light emitting section disposed on the other side that receives the light emitted from the light emitting section. a plurality of sets of light-receiving units are disposed, and the plurality of sets of light-emitting units and light-receiving units are disposed corresponding to the vicinity of edges of documents of various sizes placed on the document placement unit. A copying machine with an original size detection function.