JPS6010235A - Copying machine - Google Patents

Abstract

PURPOSE:To display automatically an original size by measuring the size of an original while the original is fed from an initial position to a reference position for copying by an original feeder. CONSTITUTION:A photodiode 22 detects the light emitted from a light emitting diode 21 and reflected from an original 13 and generates an original presence or absence signal 23 of an H level when there is no original. The signal 23 of an L level is generated when the original 13 is conveyed to the initial position. An original feed signal 37 of an H level is generated by a feed assignment signal 35 and a motor driving circuit 29 for conveying the original 13 drives a step motor 32 and at the same time a logical circuit 24 instructs the counting of the clock 43 of a clock generator 42 to a counter which ends counting when the photodiode detects the rear end of the original 13. The original size display lamps 51-54 on an operation panel 36 are selectively lighted by the result of counting during this time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a copying machine equipped with a document feeding device.

[Prior Art] Copying machines equipped with a document feeder have been commercialized in order to save the effort of setting a document at a prescribed position on a platen.

FIG. 1 shows the appearance of such a copying machine. A document feeding device 12 is arranged on the top surface of the main body 11 of the copying machine so as to cover the platen glass. The operator manually inserts the original 13 into the original insertion slot 14 of the original feeding device 12 from the right side when facing the copying machine.

As shown in FIG. 2, a document detection sensor 15 is arranged near the document insertion device 14, and when it detects manual insertion of a document, the leading edge of the document is sent to a predetermined initial position of the document feeder 12. When the print start button in the operation panel 16 arranged on the main body 11.11 side is pressed, the document 13 is fed until its leading edge reaches the copying reference position B on the platen glass 17, and then stopped. Copying is performed according to the copy setting conditions set by .

Here, the copy setting conditions refer to the number of copies per original, selection of copy paper size, etc.

At the stage when the trailing edge of the first document is sent to the copy reference position I3 and moves to -C, the document detection center t15 detects the trailing edge of this document. At this point, a message "Copy not possible" is displayed on the operation panel 15, and the next document can be manually fed. This second document is fed to the copy reference position B of the platen glass last 3 at the stage when the copying of the first document is completed and the document is discharged to the document discharge tray 18. Soshi-C
The copy operation is automatically performed using the same copy setting conditions as the previous copy.

Thereafter, in the same manner, the operator simply manually feeds the documents 13 one after another, and the copying operation continues. The copy paper after copying is discharged onto the copy paper discharge tray 19.

In this way, with this copying machine, when copying multiple originals in succession, if they are the same size, copies can be made under the same conditions by just one operation of the print start button, etc. It has this feature. However, on the other hand, if you accidentally manually feed a document with a different width, the copy will be made at the same size reduction ratio on copy paper with the same width as the previous copy, resulting in a copy with part of the document missing. There were seven drawbacks.

[Purpose of the invention]

In view of these circumstances, it is an object of the present invention to provide a copying machine that can detect and display the size of a document fed into a document feeder.

[Structure of the invention]

In the present invention, after a document manually fed into the document feeder is fed to a predetermined initial position, the platen is placed at a copy reference position B.
A copying machine that feeds the document further up to the point where it makes a copy is equipped with a measuring means that measures the time required for the document to be conveyed between these positions A and B, and this measurement result is used to correspond to the length of the document (=
a document size determining means for determining the size of the document based on the size of the document;
A document size display stage for displaying the noise in a predetermined portion of the determined document is then fed into the document feeder to allow an operator to recognize the size of the document.

〔Example〕

The present invention will be described in detail with reference to Examples below.

FIG. 3 shows the main parts of the copying machine of this embodiment. The sensor 15 in the document feeding device is composed of a light emitting diode 21 and a photodiode 22, and can detect the document I3 by detecting the reflected light of the document 13 passing near these. The document presence/absence signal 23 outputted from the collector side of the photodiode 22 is a signal that is at H (high) level when no document is present, and is at L (low) level when there is a document.

The document presence/absence signal 23 is sent to the logic circuit 24 and the motor control circuit 2.
5 and a copy instruction lamp drive circuit 26, respectively.

Assume that the first document 13 is now manually fed into the document feeder. At this time, the document presence/absence signal 23 changes to L level. The mortar control circuit 25 starts operation at 81 o'clock from this point using a built-in timer, and generates the -C motor drive signal 28 for a predetermined period of time. The motor drive circuit 29 generates a drive pulse 3I and drives the step motor 32 while the motor drive signal 28 is being supplied. The step motor 32 rotates a feeder (not shown) in the document feeder. As a result, the leading edge of the document 13 is conveyed to the initial position Δ shown in FIG. 2, and then stopped.

The motor control circuit 25 ends the timing operation at this point,
A timing end signal 33 of 1 level is output.

The time measurement end signal 33 becomes one input of another logic circuit 34. A feed instruction signal 35 is supplied to the other input terminal of the logic circuit 34 from a control circuit (not shown). When the mepelator presses a print start button (not shown) in the operation panel 36, a feed instruction signal 35 of level 1 (level 1) is generated, and the logic circuit 3 that takes the AND
A document feed signal 37 with a level of 4 to 1 is output. The document feed signal 37 is supplied to the other input terminal of the motor control circuit 25 and the logic circuit 24.

As a result, the motor control circuit 25 again outputs the motor drive signal 2.
8, and when the leading edge of the original 13 reaches the copying reference position B (the 21st position), the original 13 is controlled for 1 general feeding n;U.

At this time, the original 13 is transported at a constant speed of I OOmm /sec.

On the other hand, the logic circuit 2/I outputs the count instruction signal 39 of 1-level from the time when the supply of the original feed signal 37 of the I level is started. The counter 41 receives a clock 4 at a frequency of 100 Hz from a clock generator 42.
3 manually, and the number of clocks during the period in which the counting instruction signal 39 is outputted is 31. word 4 number result 44
is supplied to the decoder 45 as address information of a predetermined number of bits.

The decoder 45 is constituted by a read-only memory, and when the counter 41 completes one count, it reads the with data 46 corresponding to the address information. In the read-only memory, the size of the original is written in correspondence with the length of the original 13 in the feeding direction, as shown in the following table, in correspondence with the result 44 of the first count.

(Margin below) Table 1 The read size data 46 is the size display drive circuit 4
8. The size display drive circuit/l 8 turns on one of the display lamps 51 to 54 arranged on the operation panel 36 according to the contents of the size data 46 shown in Table 1. The -C indicator lamp 54 is a lamp that displays a warning when the original 13 is longer than the platen glass 17 (FIG. 2).

When a document width that is 5'C different from the desired width is displayed on the operation panel 36, the operator presses the clear key located in this panel to set the width to 0. Then, the copy setting conditions are canceled, and the operator can set new conditions such as the reduction ratio. If the print start button is then pressed, the set document will be copied under the new copy setting conditions. Of course, depending on the copying machine, it is also possible to automatically change the reduction ratio when the size of the document is inappropriate in relation to the size of the copy paper.

Before the operator presses the stop key (not shown) without pressing the clear key, the -C original discharge signal 55 is supplied from the control circuit to the motor control circuit 25, and the original 13 is not copied. Evacuation takes place.

When the desired document size is displayed on the operation panel 36, the document 13 is automatically copied after a predetermined time has elapsed. Second, it is discharged.

By the way, when the trailing edge of the original 13 is detected by the original detection sensor 15 while it is moving to the copying base f=position I3, the copy display drive circuit 26 turns on the copy-ready display lamp 56 on the operation panel 26. Do a dot illusion. As a result, a lamp will be displayed with the explanation "Unable to copy". The operator manually feeds the next document at this stage. The manually fed document is fed to the initial position A and then stopped.

Then, the document is sent to the copy reference position B at the timing when the previous document is ejected to the ejection tray 18. At this time, the size of this document is determined. The copying operation continues 1:J in the same manner.

In the second embodiment described above, the same sensor is used as the sensor for detecting the insertion of the document and the sensor for determining the width of the document, but it is of course possible to use separate sensors for each. . J In the second embodiment, a sensor that detects reflected light was used, but the sensor that detects transmitted light from the original is not used.
Cb is good.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to determine the size of the original sent to the original feeding device13.Therefore, various controls such as automatic setting of magnification and t are automatically performed, thereby improving the efficiency of IV operations. Be able to do it 1.

[Brief explanation of the drawing]

FIG. 1 is an external view of a copying machine equipped with a document feeder, FIG. 2 is an explanatory diagram illustrating each stop position of a document in the document feeder of this copier, and FIG. 3 is an example of the present invention. 1 is a block diagram showing main parts of a copying machine according to an embodiment. FIG. 12...Document feeder, 13...Document, 15...Document detection sensor, 36...Operation panel, 41...Counter, 42...Tarlock generator, 45...Decoder, 48...Size display drive circuit, 51-54...
...Display lamp, Δ...Initial position, B...Copy reference position. Applicant Fujiguchi Tsukusu Co., Ltd. Representative Patent Attorney Ume Yamauchi R [

Claims (1)

[Claims] In a copying machine equipped with a document feeding device, the document inserted into one end of the device is first fed to a predetermined initial position, and then the document is fed at a predetermined speed to a predetermined copying reference position within the device, and then a copying process is executed. a measuring means for measuring the time required for conveying the document from the initial position to the copying reference position; a document size determining means for determining the size of the document by associating the measurement result of the one-measurement means with the length of the document;
A copying machine comprising: document size display means for displaying the determined size of the document.