JPS60166965A - Copying machine - Google Patents

Abstract

PURPOSE:To perform copying to one kind of copying paper from originals having different sizes at an adequate reducing scale by setting the reducing scale from the relation between the length of the original identified from the result of measuring the time until the original fed to an intended position is fed to a reference position for copying and the size of the copying paper. CONSTITUTION:The size of copying paper is displayed via size detectors 27, 28 for copying paper and a tray selecting circuit 29. Depression of a key and the size data of the copying paper are supplied to a reducing scale setting circuit 35. When the operator inserts manually an original to the machine, the output 23 from a sensor 15 falls to an L level and an original motor control circuit 25 starts clocking operation. An original motor driving circuit 39 and a step motor are stopped when the original is fed to a prescribed position A by said circuit and motor. The original is again brought to a reference position B via the circuit 25 by the signal from a logical circuit 44 upon depression of a start button. The required time between A and B is fed from a counter 51 to the circuit 35 by which the reducing scale is calculated and is fed to a control circuit 59 for moving the position of a lens and a control circuit 61 for the speed of a photosensitive body, by which the copying at the adequate reducing scale is performed.

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]

2. Description of the Related Art Copying machines equipped with a document feeder have been commercialized to save the effort of setting a document at a specified position on a platen.

Figure 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 slot 14, and when it detects manual insertion of a document, the leading edge of the document is sent to a predetermined initial position A of the document feeder 12. When the print start button in the operation panel 16 disposed on the main body 1f-1 is pressed, the leading edge of the original 13 reaches the copy reference position B of the platen glass 17.
After the copy is sent until it reaches , it stops, and copying is performed under the copy setting conditions preset by the operation panel 16.

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 original is being sent to the copy reference position B, the original detection sensor 15 detects 1'+af after this original. At this point, the message "Ready to copy" is displayed on the operation panel 15, and the next original can be inserted.The copying of the first original is completed for this second original. When the document is discharged to the document output tray 18, it is fed to the copy reference position (3) on the platen glass 13.The copying operation is then automatically performed under the same copy setting conditions as the previous copy. The copying operation continues simply by the operator manually feeding the original documents 13 one after another.The copy paper after copying is ejected to the copy paper output tray 19-1-.In this way, in this copying machine, multiple sheets are When making continuous copies of originals, if they are of the same size, the advantage is that copies can be made under the same conditions by just one operation of the print start button, etc.However, on the other hand, if the originals of different sizes If you accidentally insert the
As a result of copying on copy paper of the same size as the previous copy with the same rise reduction ratio, part of the original is missing. In order to prevent such a situation, conventionally, originals of the same rise were copied all at once. However, when such a copying form is adopted, it may not be possible to copy the pages in order. Particularly when a sorter is used to make a large number of copies, there is a problem in that a lot of time is spent replacing copy sheets, making it impossible to take full advantage of the benefits of mechanization.

[Purpose of the invention]

In view of these circumstances, the present invention provides a document feeding device? To provide a copying machine capable of creating a copy image at an appropriate reduction +, t-t on one type of copy paper with uniform → noise even if originals of different sizes are sent to , i. is its purpose.

[Structure of the invention]

In the present invention, after a document that is manually fed into the document feeder is fed to a predetermined initial position, the document is further fed to the copying reference position B of the platen and then transported between these positions △ and 11 to the copying machine that performs copying. a measuring means for measuring the time required for the document to be processed; a document size determining means for determining the size of the document by associating the result of the measurement 111 with the length of the document; A reduction ratio setting means is provided for setting the reduction ratio in relation to the size of the copy paper to be printed.

Even if originals of different sizes are sent to the original feeding device, the reduction ratio can be changed accordingly.

〔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 is configured to be able to detect the document 13 by detecting the reflected light of the document 13 passing near these. Original presence/absence signal 23 output from the collector side of the photodiode 22
is a signal that becomes H (high) level when there is no original, and becomes I (low) level when there is an original.

The document presence/absence signal 23 is supplied to the logic circuit 2/I, the I+1 document motor control circuit 25, and the copy instruction lamp drive circuit 26, respectively.

This copying machine is equipped with two types of cassette trays (not shown) containing copy sheets of different sizes. Two copy paper size checks fli 'a:'j27.
28 detects the blade size of the copy paper in each tray based on the position of a magnet placed on the side wall of the cassette tray, and outputs size detection signals 31 and 32 to the tray selection circuit 29.

In the tray selection circuit 21], the size detection signal 31.32
Based on this, the copy paper size is displayed on an operation panel (not shown). Then, when the operator presses a key (not shown) for cassette tray selection 4R, the cassette tray is selected by the l-ray selection signal 33 generated thereby. The size of the selected copy paper is supplied as copy paper size data 34 at a set reduction ratio of f/3:15.

Assume that in such a copying machine, an operator selects a cassette tray and then manually feeds the first document into the document feeder. At this time, the document presence/absence signal 23 changes to L level. The original motor control circuit 25 starts a timing operation from this point on using a built-in timer. Then, a document motor drive signal 38 is generated at lη at a predetermined period of time.

While the original motor drive signal 38 is being supplied, the original motor drive circuit 39 generates a drive pulse 4I to drive the original step motor 42.

The document step motor 42 rotates a feed roller (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 original motor control circuit 25 terminates the timing operation at this point and outputs a timing completion signal 43 of l-level. The end signal 43 becomes one input of another logic circuit 44.

The other input terminal of this logic circuit 44 is supplied with a feed instruction signal /15 from a control circuit (not shown). When the operator presses a print start button (not shown), an H level feed instruction signal 45 is generated, and a logical product logic circuit 44 outputs an l-level original feed signal 47. Ii'JC manuscript feed signal 47 is connected to the manuscript motor control circuit 25 and the logic circuit 2/
1 and the other input terminal of 1.

The original motor control circuit 25 thereby starts outputting the original motor drive signal 38 again, and controls the conveyance of the originals 1' and 3 until their leading edges reach the copy reference position B (FIG. 2). At this time, the original 13 is conveyed at a constant speed of 10 mm/sec.

On the other hand, the logic circuit 24 outputs the word count instruction signal 49 at the H level from the time when the supply of the document feed signal 47 at the It level is started. The counter 51 receives a clock 53 having a frequency of 10011z from the clock generator 52, and counts the number of clocks during the period in which the count instruction signal 49 is output. The counting result 54 is supplied to the decoder 55 as address information of a predetermined number of bits.

The decoder 55 is constituted by a read-only memory, and reads out the document size data 56 corresponding to the address information when the counter 51 completes the number of words. In the read-only memory, the size of one original is written in correspondence with the count result 54, which is arranged according to the length of the original 13 in the feeding direction, as shown in the following table.

The document size data 56 read from the first table is supplied to the reduction ratio setting circuit 35. The reduction ratio setting circuit 35 includes a read-only memory. This read-only memory stores the copy paper size data 34 as the first address information, the original size data 56 as the lower address information, and the settings for the copying machine's reduction ratio as shown in the table below. is written.

The second table reduction magnification setting circuit 35 uses these size data 34.56
The setting value 58 of the reduction ratio is read out based on. For example, if the operator selects paper with a 34-edge blade size as the copy paper,
When a 3-size original is manually fed, the setting value is set to 58, and an 85% reduction is read out. The set value 58 is the original motor control circuit 25 and the lens position movement control circuit 59.
and a photoreceptor movement speed control circuit 61, respectively.

The original motor control circuit 25 controls the original 13 when the data indicated by "=" in the second table is read out as the set value 58.
without waiting for it to be copied.
(see figure). At this time, the operation panel displays
A display drive circuit (not shown) displays the message ``The original size is inappropriate and cannot be copied.'' In this case, copying work for that manuscript is abandoned. That is, the lens position movement control circuit 59 and the photoreceptor movement speed control circuit 61 do not perform any control operation.

In other cases, that is, when specific data representing the reduction ratio is read out as the set value 58, the lens position movement control circuit 59 moves the lenses, mirrors, etc. of the optical system of the copying machine to predetermined positions. , to set the reduction ratio.

When the setting of the reduction ratio is completed, the original set in the document feeder is copied under the predetermined copy setting conditions. At this time, the photoconductor movement speed control circuit 61 controls The moving speed of a photoreceptor (not shown) is changed to set the reduction ratio in the direction in which the copy paper is fed.

Of course, in a platen moving type copying machine, the moving speed of the platen instead of the photoreceptor is set to a predetermined value.

When the copying of the first document 13 is completed in this way, the document motor control circuit 25 is supplied with the document ejection signal 63. be done.

By the way, when the trailing edge of the original 13 is detected by the original detection sensor 1115 while moving to the copy base (position B), the copy display drive circuit 26 turns on the copy ready indicator lamp 64. °You can copy°
The explanatory text '' will be displayed on the lamp. The operator manually feeds the next document at this stage. The manually fed document is fed to the initial position and then stopped. Then, at the timing when the previous original is ejected to the ejection tray 18, it will be fed into the copy], (semi-position. The copying operation of the original continues in the same manner at the optimum reduction ratio for copying paper of the same size.

In the embodiments described above, the same sensor serves both as a sensor for detecting the insertion of a document and a sensor for determining the size of the document, but it goes without saying that separate sensors may be used for each. Further, in the embodiment, a sensor that detects reflected light is used, but a sensor that detects transmitted light of an original may also be used.

〔Effect of the invention〕

As described above, according to the present invention, originals of various sizes can be copied onto one desired type of copy paper at an appropriate reduction ratio. Therefore, there is an advantage that filing of copy sheets becomes easy.

[Brief explanation of the drawing]

Figure 1 is an external view of a copying machine equipped with a document feeder;
Reference numeral 71 is an explanatory diagram for explaining the 0 position of each original document in the document feeder of this copying machine, and FIG. 3 is a block diagram showing the main parts of the copying machine in one embodiment of the present invention. 12...Document feeder, 13...Document, 15...Document detection sensor, 29...Tray selection circuit, 35...Reduction ratio Setting circuit, 5I...Counter, 52...Tarlock generation 2g1 55...Decoder, Δ...Initial position, B...Copy reference position .・Applicant: Fuji Xerox Co., Ltd. Agent
Patent Attorney Ume Hi Yamauchi (Fig. 1, Fig. 2, Fig. 3)

Claims (1)

[Claims] A document feeding device is provided, and the document inserted into one end of this device is first fed to a predetermined initial position, and then this ′! In a copying machine that executes a copying process after feeding a document at a predetermined speed to a prescribed copy reference position in a storage A, a measuring means for measuring the time required for conveying a document from the initial position to a copy reference position; A document size determination device that determines the size of the document by associating the measurement result of the device with the length of the document, and a reduction ratio that sets the reduction ratio based on the relationship between the determined size of the document and the size of the copy paper on which copying is to be performed. A copying machine comprising: magnification setting means.