SORTING APPARATUS

Abstract: The sorting apparatus comprises first detecting means (5) detecting time intervals between copy papers, second detecting means (6) detecting exchange of a first manus­ cript to a second manuscript, sorting number detecting and memorizing means (7, 8) memorizing a sorting number, and sorting instruction means (9) for instructing sorting means (2) to sort the copy papers with regard to the se­ cond and subsequent manuscripts on the basis of said sor­ ting number.

Description: 1. Field of the Invention The present invention relates to a sorting apparatus for sorting copy papers discharged from an image forming apparatus of a copying machine, a printing machine and so on, the sorting apparatus detecting exchange of a manuscript on the basis of discharge time interval of the copy papers. 2. Description of the Related Art Hitherto, in an off-line type sorting apparatus, to which signals of the copying machine are not supplied, the copying machine copies and discharges the copy papers to the sorting apparatus at time intervals as shown in FIG.1. That is, FIG.1 shows such case that 5 pieces of copy papers are sorted for a first manuscript and the first manuscript is exchanged, and further 5 pieces of copy papers are sorted for a second manuscript. In the FIG.1, T₁ indicates the discharge time interval of the sorted copy papers for the first manuscript. T₂ indicates the exchange time interval of the first manuscript to the second manuscript. T₃ indicates the discharge time interval of the sorted copy papers for the second manuscript. Then as shown in FIG.1, the time interval T₂ is designed to be larger than the time intervals T₁, T₃ so that the sorting apparatus can detect the manuscript exchange. Thus the sorting apparatus detects the number of the sorting copy papers for one manuscript (hereinafter abbreviated as sorting number) on the basis of time interval T₂ and memorizes the sorting number and further sorts for subsequent( second, third,···) manuscript by utilizing the sorting number. However the sorting apparatus is designed in a manner that even after the sorting number is detected and memorized by utilizing the first manuscript and even when the sorting is executed for the second manuscript and after, the manuscript exchange time interval T₂ is designed to be larger than the time intervals T₁, T₃ by the copying machine, and thereby the subsequent manuscript exchange is detected by the sorting apparatus by both the sorting number and the time interval T₂. The reason why the manuscript exchange time interval T₂ is designed to be larger than the time intervals T₁, T₃ for the subsequent manuscript is below-mentioned. The copying machine happens to copy papers of over the memorized number for the same one manuscript with regard to the subsequent manuscript. On such case, the sorting apparatus shoud consider the case as a sorting-over-error and should discharge the superfluous copy papers into a lowest bin tray. This is the above-mentioned reason. In other words, with regard to the sorting of the subsequent manuscript, when the manuscript exchange time interval T₂ is not larger than the time intervals T₁,T₃, the sorting apparatus cannot detect the sorting-over-error. However in such conventional sorting apparatus, total copying operation time of the copying machine is long, since the manuscript exchange time intervals T₂ of the subsequent manuscript is larger than the time interval T₁, T₃. Summary of the Invention An object of the present invention is to provide a sorting apparatus of a copying apparatus capable of copying in a high speed. This object is achieved according to the invention by the features of claim 1. Brief Description of the Drawings Fig. 1 is a timing chart showing a discharge time interval of copy papers of a conventional copying machine. Fig. 2 is a block diagram showing an embodiment of a sorting apparatus according to the present invention. Fig. 3 is a side sectional view showing another embodiment of the sorting apparatus according to the present invention. Fig. 4 is a flow chart showing the operation of the embodiment of the sorting apparatus according to the present invention. Fig. 5 is a timing chart showing a discharge time interval of copy papers of a copying machine of the embodiment of the sorting apparatus according to the present invention. Description of the Preferred Embodiments The present invention hereunder is described further with reference to the drawings which show the embodiments thereof. Fig. 2 is a block diagram showing an embodiment of the sorting apparatus according to the present invention. An image forming apparatus 1, for example, copying machine or printing apparatus, is such an apparatus for copying a manuscript down into paper 4. A sorting means 2 is a machanism of the sorting apparatus, for taking in the copy paper 4 discharged from the image forming apparatus 1 and for sorting the copy papers 4. A paper sensor 3 is a device, for example, a conventional touch-type or an optical-type sensor, for detecting the transferring of the copy paper 4 from the image forming apparatus 1 to the sorting means 2. A time interval detecting means 5 is means for detecting time interval T₁,T₂,T₃,···between the successively transferred copy papers 4 on the basis of an output signal of the paper sensor 3. The time inteval T₁,T₂,T₃,··· is detected on the basis of the timing when the paper sensor 3 detects a front edge of the paper 4 or the timing when the paper sensor 3 detects a rear edge of the paper 4. Or the time interval T₁,T₂,T₃,··· is detected on the basis of a time interval between the timing of the detecting of the rear edge of a former paper 4 and the timing of the detecting of the front edge of a latter paper 4. A manuscript exchange detecting means 6 is means for detecting exchange of the manuscript in the image forming apparatus 1 on the basis of the time interval T₁,T₂,T₂,··· detected by the time interval detecting means 5. That is, as shown in FIG.5, when the first manuscript is copied, the time interval T₁ is relatively short. On the contrary, when the first manuscript is exchanged to second manuscript, the time interval T₂ is larger than the time interval T₁. Therefore, the manuscript exchange can be detected by comparing the time interval T₁,T₂. The image forming apparatus 1 copies and discharges the copy paper at such time interval T₁,T₂. For realizing such time interval T₁, T₂, for example, the image forming apparatus 1 has such sort key that the image forming apparatus 1 makes distinction between the first manuscript and the second and after manuscripts by the sort key operation. Or such image forming apparatus 1 having a manuscript automatic feeding device, can make distinction between the first manuscript and the second and after manuscripts by using signals from the manuscript automatic feeding device ,thereby realizing the time interval T₁,T₂. A sorting number detecting means 7 is means for detecting sorting number of copy papers on the basis of both the manuscript exchange detected by the manuscript exchange detecting means 6 and the output signal of the paper sensor 3. That is, utilizing the output signal of the paper sensor 3, the sorting number detecting means 7 starts to count the copy paper pieces when the first copy paper 4 is discharged, and issues the counted number as the sorting number when the manuscript exchange is detected by the manuscript exchange detecting means 6. FIG.5 shows such embodiments that number is 5. A memorizing means 8 is means, for example, RAM( random access memory) for memorizing the sorting number detected by the sorting number detecting means 7. A sorting instructing means 9 is means for instructing the sorting means 2 to sort the discharged copy papers with the sorting number memorized on the memorizing means 8 with regard to the second and after manuscripts. Then the sorting means 2 sorts the subsequent copy papers on the basis of the sorting number regardless of the time interval length. The image forming apparatus 1 copies and discharges the copy papers at such short time interval of T₃,T₀,T₄···. FIG.3 is a side sectional view showing an embodiment of the sorting apparatus utilizing the micro-computer according to the present invention. The image forming apparatus 1 has a discharging roller 166 built-in for discharging the copy paper 4. Near the discharging roller 166, upper stream ( which is judged on the basis of the flow of the copy paper 4 ) parts of an upper guide 100 and an under guide 80 are disposed forming gap. The down stream parts of the upper guide 100 and under guide 80 fronts on upper stream edges of bin trays 56A∼56E. The central part of the upper guide 100 is cut through forming hole 100a and the central part of the under guide 80 is cut through forming hole 80a which is facing the hole 100a. A pin of the paper sensor 3 passes through upward the holes 100a,80a. When the copy paper 4 transfers between the upper guide 100 and the under guide 80, the copy paper 4 run against the pin, thereby to drive an optical switch of the paper sensor 3. Therefore, the paper sensor 3 can count the number of times of transferring of the copy papers 4. The upstream-side edges 64A∼64E of the bin trays 56A∼ 56E go up and go down one by one in order as shown by two dots chain line. As the upstream-side edges 64A∼64E go up and down in order, large space X is produced in order at the upstream-side of the bin trays 56A∼56E, thereby to respectively take into the copy paper 4 discharged from the image forming apparatus 1. A cam member 88 is means for making the bin trays 56A∼ 56E go downward and go upward in order. That is, the cam member 88 is rotated by a bin tray drive means 10, thereby to make the bin trays 56A∼56E go upward in the order of the bin tray 56a, the bin tray 56B, the bin tray 56C, the bin tray 56D and the bin tray 56E, and to make the bin trays 56A∼56E go downward in the order of the bin tray 56E, the bin tray 56D, the bin tray 56C, the bin tray 56B and the bin tray 56A, ( see Japanease patent appl.no.sho 62-300,077 ). The bin tray drive means 10 is connected to a CPU (central processing unit) 13 through an interface 11. The paper sensor 3 is connected to the CPU 13 through an interface 12. A timer 15 is a time counter. The CPU 13 is means for realizing these functions of the time interval detecting means 5, the manuscript exchange detecting means 6, the sorting number detecting means 7, the sorting instructing means 9 and so on, by utilizing the RAM means 8, the timer 15 and so on. A ROM means 14 is a read-only memory memorizing such computer program to realize the above-mentioned functions of the CPU 13. Then, the operation of the above-mentioned embodiments is described referring to the flowchart of FIG.3. First the first manuscript is set on a manuscript set plate of the image forming apparatus 1 and the sorting number, for example, 5 is set by ten key etc. Next, a first copy paper 4 is discharged from the discharge roller 166 and is supplied to the gap of the upper guide 100 and the under guide 80 when a copy start key is pressed. The paper sensor 3 detects the first copy paper 4, when the copy paper 4 is passed through the gap( step S1). The copy paper 4 is discharged on the bin tray 56A from the downstream edge of the guides 80,100. The image forming apparatus 1 and the sorting apparatus are off-line type, and therefore the image forming apparatus 1 discharges the remaining copy papers of 4 pieces in order regardless of the operation of the sorting apparatus 1. The sorting means 2 sorts the remaining copy papers 4 to the bin trays 56B∼56E until the manuscript is exchanged. When the copy of the first manuscript is finished, the first manuscript is exchanged to a second manuscript and the image forming apparatus 1 copies the second manuscript. The time interval detecting means 5 detects the time interval( as shown in FIG.5 ) between the discharged copy papers 4 by the output signal of the paper sensor 3 ( step S2). The manuscript exchange detecting means 6 knows the exchange by detecting the large time interval T₂ corresponding to the first manuscript exchange by comparing the time intervals detected by the time interval detecting means 5( step S3). Then the sorting number detecting means 7 counts the piece number of the discharged copy papers 4 on the basis of the output of the paper sensor 3 and knows the manuscript exchange by the output of the manuscript exchange detecting means 6, and thereby to detect the copy number( 5 pieces) of the first manuscript, namely, the sorting number( step S4). The memorizing means 8 memorizes the sorting number(step S 5). Then the sorting number detecting means 7 resets the counted value to 0. The sorting instructing means 9 instructs the bin tray drive means 10 of the sorting means 2 to sort according to the sorting number( 5 pieces) memorized in the memorizing means 8(step S6). The sorting means 2 sorts the subsequent copy papers of the second, third, forth, ···manuscripts on the bases of the sorting number(5 pieces) to the bin trays 56A∼56E. Thus the sorting apparatus of the present invention sorts the copy papers for the second manuscript and after by utilizing the sorting number, and therefore the image forming apparatus 1 does not need the large time interval for informing the manuscript exchange for the second manuscript and after(see the short time interval T₀ of FIG.5). As a result, the total copy operation time can be shortened by utilizing the sorting apparatus of the image forming apparatus of the present invention. Further the sorting apparatus of the present invention can be applied to not only the sorting means having the movable bin trays but also the sorting means having fixed bin trays.

Claims: A sorting apparatus comprising: a sorting means (2) for sorting one by one image media (4) discharged from an image forming apparatus (1); a paper sensor (3) for detecting said discharged image media; a time interval detecting means (5) for detecting each time interval at least between image media of a first manuscript and between a first manuscript and a second manuscript on the basis of the output of said paper sensor (3); a manuscript exchange detecting means (6) for detecting an exchange of a first manuscript of said image forming apparatus (1) on the basis of the time interval detected by said time interval detecting means; a sorting number detecting means (7) for detecting a sorting number on the basis of both said detected exchange of the manuscript and the output of said paper sensor; and a memorizing means (8) for memorizing the detected sorting number; characterized by a sorting instructing means (9) for instructing said sorting means (2) to sort the image media with regard to the second and subsequent manuscripts on the basis of said memorized sorting number. A sorting apparatus according to claim 1, wherein said image forming apparatus (1) discharges said image media (4) at a large time interval (T₂) for exchange of a first manuscript, and at a short time interval (T₀) for exchange of subsequent manuscripts, said large time interval (T₂) being larger than the time interval (T₁, T₃, T₄) between said image media and said short time interval (T₀) being nearly equal to the time interval (T₁, T₃, T₄) between said image media.

Inventors: SIBANAKA, MITSUGU
Applicants: MITA INDUSTRIAL CO., LTD.
Application year: 1989
Main classification: B65H29
IPC codes: B65H39, G03G15