JPH0110672Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention uses a photoelectric sensor, etc., to measure the number of sheets of paper in a device for counting the number of sheets of paper, more specifically, a device that feeds sheets at intervals such as a printing machine or a copying machine. The present invention relates to a sheet number counting device that prevents duplicate counting when detecting and counting using a paper sheet number counting device.

(Background Art) Devices such as printing machines and copying machines that feed sheets at time intervals are provided with a sheet counting device that counts the number of sheets that have been sent.

There is a device that uses a photoelectric sensor as a paper detector in a paper counting device, but due to variations in the amount of light transmitted through the paper when the paper passes the detector,
There was a problem that a sheet of paper was counted more than once.

Even when a microswitch is used as a paper detector, a similar miscount may occur if the pressure applied to the microswitch is not continued to exceed a certain level while detecting paper. It is extremely difficult to adjust the detection pressure to accommodate thin paper.

(Purpose of the invention) The purpose of the invention is to count duplicates so that even if the paper detector outputs two or more outputs due to variations in paper as the paper passes, it will only count once for one sheet of paper. An object of the present invention is to provide a sheet number counting device that prevents the above problems.

(Structure of the invention) In order to achieve the above object, the paper sheet number counter device according to the present invention is a paper sheet number counter device that counts the number of sheets fed by a sheet feeding device at fixed time intervals. a paper detector that detects the presence of the paper and outputs a paper detection signal; a timing pulse generating means that detects a period in which the paper is not present in the detection section and generates a timing pulse; and paper from the paper detector. a paper detection memory circuit that detects the presence of the paper using a detection signal, outputs a paper detection memory signal, and holds the signal until a timing pulse is generated from the timing pulse generating means; It consists of a counter that is incremented by a detection storage signal.

According to the above structure, the object of the present invention can be completely achieved.

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIG. 1 is a circuit diagram showing an embodiment of a sheet counting device according to the present invention, and FIG. 2 is a time chart for explaining the operation of the embodiment.

The paper detector 1 is a detector for detecting the passage of the paper 2, and is composed of a photoelectric sensor 11, a buffer 12, a comparator 13, and the like. The photoelectric sensor 11 is, for example, a combination of a light emitting diode LED and a phototransistor PT.
The output of the photoelectric sensor 11 is passed through a buffer 12,
It is connected to the comparator 13. Therefore, the paper detector 1 outputs a high-level signal when the paper 2 is present in the detection section of the photoelectric sensor 11.

Paper 2 is paper from a printing machine, etc., and is sent in the direction indicated by the arrow.

The timing pulse generation circuit 3 is a circuit that mechanically, magnetically, or optically generates a timing pulse indicating that the paper 2 is not present in the detection section of the photoelectric sensor 11 in synchronization with the rotation of the cylinder of the printing press.

The paper detection storage circuit 4 is composed of first and second flip-flops 41 and 42.
The first flip-flop 41 has a reset priority function, and the second flip-flop 42 has a set priority function. First flip-flop 41
The output of the paper detector ₁ is connected to the set input S1 of the paper detector 1. The first flip-flop 41 is for storing the paper detection signal from the paper detector 1. The reset input _R1 of the first flip-flop 41 is connected to the output of the second flip-flop 42.
_Q2 is connected. A timing pulse from the timing pulse generation circuit ₂ is connected to the set input S2 of the second flip-flop 42.
The second flip-flop 42 detects from the timing pulse that the paper 2 is not detected, and flips the first flip-flop 42.
This is for resetting 1. The output _Q1 of the first flip-flop 41 is connected to the reset input _R2 of the second flip-flop 42, and the second flip-flop 42 is reset by the signal from the first flip-flop 41 detecting paper 2. . Output of first flip-flop 41
_Q1 is branched and connected to counter 5.

The counter 5 is an integration counter that is incremented by the rise of the paper detection storage signal from the paper detection storage circuit 4 and counts the number of sheets of paper 2.

Next, referring mainly to FIG. 2, the operation of the sheet number counter device according to the present invention will be explained.

At time _t0 , a signal indicating that the paper 2 is not detected is inputted to the set input _S2 of the second flip-flop 42 by a timing pulse from the timing pulse generation circuit 3 (see FIG. 2). d), the output of the second flip-flop 42;
_Q2 becomes high level (FIG. 2f), and the first flip-flop 41 is reset (FIG. 2b,
c).

At time _t1 , when the sheet detector 1 is blocked by the passage of the sheet 2, a high level signal is input to the set input _S1 of the first flip-flop 41 (FIG. 2a). The flip-flop 41 is set and a high level signal is output from the output _Q1 (FIG. 2c). Since a high level signal is input to the reset input R2 of the second flip-flop ₄₂ (FIG. 2e), the second flip-flop 42 is reset at the rising edge of that signal. Therefore, since the output of the second flip-flop 42 goes low (FIG. 2f), the reset input of the first flip-flop 41 goes low (FIG. 2b) and is not reset. After the first flip-flop 41 is set, it cannot be changed until the next reset signal goes high.

Therefore, even if the output of the paper detector 1 goes low at time _t2 and goes high again at time _t3 , the first flip-flop 3 remains set (see Figure 2c). ). In other words, the first
Even if the set input _S1 of the flip-flop 41 becomes low level midway through, the output _Q1 does not change. Since the counter 5 counts at the rising edge of the paper detection storage signal, it will not be incremented and counted twice in such a case.

At time _t4 , when the paper 2 passes the photoelectric sensor 11, the output of the paper detector 1 goes low, so the set input _S1 of the flip-flop 41 goes low (FIG. 2a).

At time _t5 , a timing pulse is generated from the timing pulse generating circuit 3 (FIG. 2d), the second flip-flop 42 is set, and the first flip-flop 41 is reset (FIG. 2f,
c). At the same time, the reset terminal of the second flip-flop 42 also becomes low level (FIG. 2e).

In this way, even if the paper detection signal is output twice or more due to erroneous detection by the paper detector 1 during the paper 2 detection, the timing pulse generation circuit 3 does not generate a timing pulse during that time, so the paper detection The memory circuit 4 remains in the set state, no extra count signal is generated, and the counter 5 can perform accurate counting.

(Effects of the invention) As explained in detail above, according to the invention,
To accurately count the number of sheets even if an erroneous detection signal is generated from a sheet detector. Therefore, delicate adjustment of the paper detector is no longer necessary when counting thin paper.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a sheet number counter device according to the present invention, and FIG. 2 is a time chart for explaining the operation of the embodiment. 1...Paper detector, 11...Photoelectric sensor, 12
...Buffer, 13...Comparator, 2...Paper, 3...Timing pulse generation circuit, 4...Paper detection storage circuit, 41, 42...Flip-flop, 6...Counter.

Claims (1)

[Scope of utility model registration request] A paper counter device that counts the number of paper sheets fed by a paper feeding device at regular intervals includes a paper detector that detects the presence of the paper in a detection section and outputs a paper detection signal; a timing pulse generating means that detects a period in which the paper is not present in the detection section and generates a timing pulse; and a timing pulse generator that detects the presence of the paper based on a paper detection signal from the paper detector and outputs a paper detection storage signal and generates the timing pulse. A paper sheet number counter device comprising: a paper detection memory circuit that holds a timing pulse signal from a generating means until the timing pulse is generated; and a counter that is incremented by a paper detection memory signal from the paper detection memory circuit. .