JPS58153964A - Reading method of original size in copying machine - Google Patents

Abstract

PURPOSE:To recognize the original size correctly, by detecting the width together with the length of the original. CONSTITUTION:The original is inserted from an insertion entrance 10 so that its center is placed in the position of an insertion detecting sensor 3. The width of the original is detected by width sensors 4-7. The length of the original is detected on a basis of the quantity by which an original feeding roller 34 is rotated from the time, when the original reaches a sensor 17 out of jam detecting sensors 16-27, to the time when the trailing edge of the original passes through the insertion detecting sensor 3. Pulses generating by the rotation of an encoder 35 attached to a driving motor M are counted to measure the length. If the detected result of the original in width and length are matched to an original sheet having a definite size, a size selection miss is displayed and is reported to the operator, and the original is copied onto only one copy paper even in the multiple copy mode to prevent a waste of copy papers due to miscopy.

Description

[Detailed description of the invention] The present invention relates to a method for reading and compiling a document size.

Conventionally, in the method of detecting the document site using tt-sensers, the common method has been to provide the sensors at symmetrical positions to the document insertion slot at intervals that allow each size to be classified, and to measure the width of the document. An example is shown in FIG. Figure IE1 is a top view of the document insertion slot, and reference number 1 is the document, the leading end of which is in contact with the abutment r-)2. A sensor 3 for detecting the insertion of a document is placed near the center C abutment r-) of the document insertion slot, and a pair of ^4t size detection sensors are located at symmetrical positions on both sides of the sensor 3. /14.4
', A! st size detection seven sensor 5.5', A2 size detection sensor/? 6.6', ^1 size detection center t7.7' is arranged. In this way, the reason why the sensors for detecting each size are provided symmetrically on both the left and right sides of the document insertion detection sensor 3 is that the I This rounding prevents mistakes when reading the size. If you select the special K11l size detection, you may select an inappropriate reduction ratio for the actual original size, or select an inappropriate copy paper feed tray, and create multiple copies. The purpose is to prevent this inconvenience, as it is possible for the original to become wrapped around the original when it enters the circulation path. However, this conventional document size detection method requires a large number of sensors, which poses a problem in terms of cost.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such conventional problems and to provide an inexpensive method for copying original documents without requiring a large number of sensors.

Rounding 1 to achieve this purpose Manuscript nizing glare 9 of the present invention
Method: Detecting the width of the original at the original insertion slot, detecting the length of the original while transporting the original, and confirming the original width detection according to a table of original lengths for nine original widths set in advance. It is characterized by the following characteristics: That is, in the present invention, the relationship between the document width and the document length is
Focusing on the 1:1 ratio determined by LLC, both document width and document length are detected, and by making them correspond, it is possible to check for errors in document width detection.

In this way, according to Honryu@, not only the document width but also the document length is detected, so document width detection does not need to be highly accurate in the past, It is only necessary to provide a seven-sensor sensor, and the original length detection line can be easily performed using a conventional paper jam sensor, resulting in a quick shutdown of the entire copying machine.

The present invention will be explained in more detail below with reference to the drawings. FIG. 2 shows the arrangement of the document width detection sensor used in carrying out the present invention, and is a top view of the document insertion section, similar to FIG. 1.

In this figure, the same reference numerals are used for the same elements as in FIG. As you can see from this diagram, K.

The document width detection sensor +4.5.6.7 is located approximately in the center of the document insertion section, and is located only on the right side of the document insertion detection center t3. The number is a fraction of the number of document width detection sensors shown in IIE 111.

The WtS diagram is a schematic diagram of the document conveyance device O, in which a document is inserted through a document insertion opening 10 and conveyed along a document conveyance path 11. A ninth pair of feed rollers 12 and 12' are arranged in the document insertion opening 10 to feed the document into the document conveyance device, one of which is driven by a motor 13. A document center mr-) 14 is arranged in the document insertion section 10, and
Then, the original is inserted into this original center (r-) 14 with the leading edge of the original **. This insertion of the original is performed by the original insertion detection sensor 3 (see No. 211). Is this manuscript so that it can be retracted downward from the solenoid ISK?
When the is retracted downward, the document conveyance operation starts. Paper jam detection sensors 16 and 17 are installed at appropriate locations in the document transport path 10.
．． 18.19.20%21.22.23.24,! ! 5
．． 26.27 are located. Makuko OII document transport device.

If the circulation path is to be changed, the circulation path can be changed depending on the size of the paper, so the circulation path is indicated by reference numbers 28.29, 30, 31.3! Reference numeral 33 indicates the derateno section, where the light is irradiated and projected onto a photoreceptor (not shown) through the path indicated by the seven light beams. Reference number 3
Reference numeral 4 denotes a document conveyance roller, and this document conveyance roller is driven by a motor MK.

Next, a method for detecting the length of a document in such an apparatus will be described. To detect this document length,
An X document insertion detection sensor 3 and a suitable paper jam detection sensor 17 are used. Axis Ka encoder 3 of document transport motor M
5 is connected].

The output of the encoder 3s is divided by a frequency divider 36, and the divided 9Δ pulses are inputted as an interrupt signal to the CPU (central processing unit) of the controller 37 of the copying machine. When this interrupt signal is input, a document length detection program is started in the CPU. That is, the counter necessary for document control is set to fK+IK when the above interrupt occurs, and the length detection timer is incremented by 1 every time the counter counts 20. In such a program, when the leading edge of the original reaches the sensor 17 and the length detection timer is activated at 9 and 1i, the trailing edge of the original O passes through the sensor 3 and the value of this length detection timer is read during running. Get the length information of the original manuscript. Strict 1
Ktj The actual sad information echoes the value of this timer.
The length of the transport path between the sensor 3 and the sensor 17 is the visible length.

-The length of the manuscript that changes to the value of 4 can be easily found from the variation of 7-1. Immediately after completing this document length detection program, check the document width detection! Rodaram begins. That is, when the original passes through the dragon t3, the upper mejlpeng-detection check program is started.

This 1lIII width information is given to the original width detection sensor (see No. 211) K), and the original size is determined based on this width information. Generally, if the document size is known, its length can be known, and this length is then matched with the document length determined by the document length detection program. In this case, this motiawase K has some umbrella case, but it is ku-se. This is because there is some error in the manuscript size. 1. From the width information above, the length of the large manuscript size is determined by the width information above. If the length information obtained is different from the original length, the internal information of the nine set count given by the copier operator is forced into the 1-sheet mode, and a 1-sheet copy is created. The document is ejected from the document conveying device.At this time, a display indicating "I Original Size Wrong" is flashed at the stage where the copying machine is shutting down, in order to notify the operator of the error in the document width information.

This flashing allows the operator to detect that the document has been inserted incorrectly and to insert the document again.

In this way, the single document size reading method is characterized by matching the document width information with the length information, so long document width detection is possible even if the accuracy is not high. , thus reducing the overall cost of the copier. Moreover, if the document size is erroneously detected by this document width detection, the operator is immediately notified, so there is no need to make a large number of unnecessary copies, and thus cost and time savings can be achieved.

[Brief explanation of the drawing]

11th! 1 is a copy showing the arrangement of document width detection sensors according to the conventional document width detection type document size detection method. FIG. 3 is a schematic plan view of the document insertion section of the machine. FIG. 2 is a schematic plan view of a document insertion section of a copying machine showing the arrangement of document width detection sensors according to the document size method of the present invention. FIG. 5 is a schematic side view showing an example of a document conveying device to which the document size reading method of the present invention is applied. 1...-1)III%z, 14-...Tsu! In”
-), 5-rx document insertion detection P-), 4.4', 8
．． 5', 11.6'. 7.7I... Original width detection sensor, 10... Original insertion slot, 16.17.18, 19.2G, 21.2! . z3.24.25. ! @, 27...Paper jam detection sensor, -...Transport roller status motor, aS...Encoder t, SS...minute 1m111.37...Controller, 38...CPU.

Claims (1)

[Claims] The document width is detected in the document insertion slot of a copying machine. A document size reduction method characterized in that the length of the document is detected while the document is being conveyed, and the detection of the document width is confirmed based on a table of the document length with respect to a preset document width.