JPH024493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper conveyance detection device for a copying machine or the like.

In particular, the present invention relates to an improvement in a paper conveyance detection device for paper sheets (copy paper) such as slips made up of multiple sheets bound together.

In general, delivery slips and purchase slips used in shops, department stores, etc. consist of documents for submission to recipients, for pasting products, for copies, and others, and are often made up of 5 to 7 sheets per set.

When copying a large number of original documents with product names, customers, addresses, etc. written on such documents,
Slips are fed into the paper transport path inside the copying machine, but in this case, if double feeding occurs, not only will the required number of sheets in one set be missing, but the order in which the slips are transported will be out of order, and the desired copies will not be made. This caused a significant inconvenience due to discrepancies in content.

Many double feed detection devices have been proposed in the past, but it is difficult to say that their reliability is fully satisfactory when dealing with extremely thin paper, or with extremely high or low transparency. .

The present invention provides a method for applying a method to one of a set of at least two sheets arranged in accordance with the processing order of the sheets, from the leading end of the sheet to the downstream side in the conveying direction of the sheet. a specified sheet of paper on which identification means such as marks, holes, notches, etc. are provided at predetermined intervals toward An information input means such as a control switch for inputting the standard transport time to the identification means in advance; a storage means such as a RAM for storing information from the information input means; and a memory means for detecting the leading edge of the paper sheet. Sensors such as a leading edge detection sensor and an identification sensor that detects identification means for the specific paper conveyed in accordance with the processing order, and a timer such as a timer that measures the standard conveyance time from the leading edge of the specific paper to the identification means. and determining means for determining whether there is an abnormality in the conveyance of paper sheets conveyed before the specific paper based on information input by the information input means, signals from the sensor and the timing means.

When the conveyance of paper sheets is interrupted, the measured value of the time measuring means is held, and when the conveyance is restarted, this measured value is added and calculated. An object of the present invention is to provide a paper conveyance detection device that accurately detects conveyance abnormalities with a simple mechanism by detecting the presence or absence of conveyance abnormalities by measuring the time from the leading edge of the paper to the detection of the identification means. That is.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is an explanatory diagram showing a paper conveyance path of a copying machine.

In the figure, 1 is a paper feed tray containing copy paper, 2 is a paper feed roller, 3 is a conveyance roller, and 4 is a paper feed tray containing copy paper.
is the registration roller. An arrow 5 indicates a paper conveyance path, and the paper travels along this paper conveyance path 5, and the image is transferred by the transfer drum 6. A conveyance sensor S ₁ and an identification sensor S ₂ , which will be described later, are provided between the conveyance roller 3 and the registration roller 4. The sensors S ₁ and S ₂ indicated by marks are known paper sensors.

FIG. 2 is an explanatory diagram showing the positional relationship between the transport sensor S ₁ , the identification sensor S ₂ , and the specific paper P.

In this case, the identification means for the specific paper P is constituted by the hole 7. Although the hole 7 is constant in the y direction,
In the x direction, the area from the leading edge to the trailing edge of the specific paper P is divided into several blocks (1, 2, . . . 1-1, 1), and the position is specified depending on which one of the blocks corresponds to. Then, it is determined whether or not the hole 7 is detected at this predetermined block position. Therefore, holes for other purposes may be formed in other locations.

In the figure, the direction of the arrow indicates the direction in which the copy paper is conveyed.

The copy paper is transported in the direction of the arrow in accordance with the processing order, and this specific paper P reaches the positions of the transport sensor S ₁ and the identification sensor S ₂ at a predetermined time.

The conveyance sensor S ₁ and the identification sensor S ₂ are arranged perpendicular to the conveyance direction, that is, parallel to the y-axis.

On the other hand, since the identification sensor _S2 must detect the hole 7 as described above, it is provided on the extension line of the hole 7 in the x-axis direction.

When the conveyance sensor _S1 detects the leading edge of the specific paper P, the timer starts counting. Under normal conveyance conditions, this hole 7 is the identification sensor S ₂
The time it takes to reach the reference time is counted as a reference time, and is stored in a storage unit, which will be described later. The output of the identification sensor _S2 is checked at this reference time, and if the hole 7 is detected, it means that the conveyance is normal, and conversely, if the hole 7 is not detected, it means that the conveyance is abnormal. In this case identification sensor S ₂
If it is a transmission type, when detecting the hole 7, it will detect the change of the output signal from low level to high level, and conversely, if it is reflective type, it will detect the change from high level to low level. The hole 7 is detected based on the change in the output. Here, the timer is configured to hold a count value when the conveyance of the specific paper P is interrupted by the registration roller 4, and to add to this count value when the conveyance starts again. In this way, conveyance abnormality can be detected regardless of conveyance interruption. FIG. 3 is a block diagram of a detection circuit according to the present invention.

In the figure, 8 is a control switch.
The CPU outputs the transport sensor S ₁ , identification sensor S ₂ , and transport clutch signal 9 through the I/O port 10.
(Central control unit) 11 is used to input information. 12 is ROM, 13 is RAM both
It is connected to the CPU 11 via a data bus and an address bus. 14 is a timer external to the CPU 11, and 15 is an error signal output from the I/O port 10, which is a transport abnormality detection output.

The control switch 8 controls the number of sheets of copy paper in one set arranged in processing order, the number of sheets of specific paper P,
The above-mentioned reference time (which can also be called position information of the hole 7), which is the normal conveyance time for the distance from the leading edge of the specific paper to the hole 7, is read into the CPU 11 as a binary signal.

In such a system configuration, after turning on the power,
The CPU 11, which has read the various information mentioned above from the control switch 8, waits for information from the conveyance sensor _S1 . This conveyance sensor _S1 outputs a detection signal not only when detecting the leading edge of the specific paper P but also when detecting the leading edge of other copy papers.As mentioned above, since the number information of the specific paper P is stored, It is sufficient to capture the output of the conveyance sensor _S1 when the leading edge of the copy paper of this number is detected.

When the conveyance sensor _S1 detects the leading edge of the specific paper P and turns on, the timer 14 is reset and starts counting. Then, when this count value reaches a value corresponding to the aforementioned reference time, the output of the identification sensor _S2 can be read at this timing.

If the identification sensor S ₂ detects the hole 7 at this timing (as described above, the detection output in this case will be high level if it is a transmissive type, and low level if it is a reflective type), then the detection output of the copy paper will be It is determined that the processing order is correct and the conveyance speed is normal.

If at this check timing, the identification sensor
If S ₂ does not detect hole 7, it means that double feeding has occurred, or even if double feeding has not occurred, there is an abnormality in the conveyance speed, so in this case, error signal 15 is output. It is. Further, even if the conveyance is temporarily interrupted to synchronize the image and the paper, the incrementing of the timer 14 is also stopped at the same time as the conveyance clutch signal 9 is turned off. Interruptions in transport therefore have no effect. FIG. 4 is a timing chart showing this series of operations.

The information input in STEP 1 refers to the various types of information described above by the control switch 8. Further, S ₁ ON in STEP 2 is an ON output when the number-th copy paper of the specific paper P reaches the conveyance sensor S ₁ . This output occurs and
If the conveyance clutch is turned on in STEP 3, the timer 14 starts counting in STEP 4, as described above. Then, in STEP 5, an error check for conveyance abnormality is made, that is, it is determined whether or not the hole 7 is detected at the reference time timing mentioned above. If there is a conveyance abnormality, an error signal 14 is outputted in STEP 6.

As described above, the present invention consists of 1
When detecting the conveyance status of a set of paper sheets, it is determined whether the number of a specific paper P is correct by detecting the identification means provided on the specific paper, and even the position of the identification means on the specific paper is determined. Since it is detected, even if similar holes, marks, etc. are attached to this specific paper for other purposes, it has the function of being able to distinguish between them.

In addition, in the present invention, by detecting the conveyance state of only a specific paper among a plurality of paper sheets, the paper sheets that were conveyed before the specific paper, that is, between the previous specific paper and the current specific paper, can be detected. Since it is possible to judge all at once whether there is an abnormality in the conveyance of paper sheets,
It is not necessary to provide identification means such as a mark on each sheet, and the work of attaching identification means is omitted as much as possible.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a paper conveyance path in a copying machine, Fig. 2 is an explanatory diagram showing an arrangement of sensors according to the present invention, Fig. 3 is a system block diagram according to the present invention, and Fig. 4 is an explanatory diagram showing the same operation. It is a flowchart. 7... Hole as identification means, 8... Control switch, 9... Transport clutch signal, 11...
CPU, 13...RAM, 14...Timer, P...
Specific paper, S ₁ ... Conveyance sensor, S ₂ ... Identification sensor.

Claims (1)

[Scope of Claims] 1. One of a set of at least two sheets arranged in accordance with the processing order of the sheets.
a specified sheet of paper, on which an identification means is provided at a predetermined distance from the leading end of the sheet toward the downstream side in the transport direction; and at least one of the specified sheets of the set of sheets. Information input means for inputting in advance the number of sheets and the transport time from the leading edge of the particular paper to the identification means; a storage means for storing information from the information input means; and the leading edge of the paper sheet and the processing order. a sensor for detecting the identification means of the specific paper conveyed according to the method; a timer for measuring the transportation time from the leading edge of the specific paper to the identification means; and information input by the information input means; A determination means for determining an abnormality in the conveyance of paper sheets conveyed before a specific paper based on a signal from a sensor and a timing means, and when conveyance of paper sheets is interrupted, the measurement value of the said timekeeping means is provided. is held and when transport starts again, this measured value is added and calculated, and this timer measures the time from the leading edge of the specific paper until the identification means is detected, thereby detecting transport abnormalities. A paper conveyance detection device characterized by detecting the presence or absence of. 2. In the paper conveyance detection device according to claim 1, the sensors include a leading edge detection sensor that detects the leading edge of a paper sheet and an identification detection sensor that detects a specific paper identification means. A paper conveyance detection device characterized by: