JPS5975368A - Tape reader - Google Patents

Abstract

PURPOSE:To detect the cut and the jam of a tape by measuring the time extending from the rise of a sprocket hole signal of the tape to the rise of the following sprocket hole signal to detect the time exceeding a prescribed time. CONSTITUTION:A processing device 13 starts counting by a counter provided on the inside, when it detects the rise of a sprocket signal from a photodetector corresponding to the sprocket hole of a photodetector group 8, through an input device 12, and when the rise of the following sprocket signal cannot be detected even when the count value reaches a prescribed value, it is decided that a tape is cut or jammed in a traversing system, and an alarm signal is outputted. After counting is started, when the output signals (a), (b) of an output device 11 becomes ''0'' and ''1'', respectively, the device is returned to the detection processing of the sprocket signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to improvements in tape leagues and further details.
relates to a tape league that can detect tape blockages and tape breaks.

Prior Art and Problems In tape leagues, the tape may break while reading the tape, or the tape may clog in the running system. By the way, in the conventional tape league, When the tape is running normally, the bin plunger is pushed by the tape and the contact operated by the bin plunger is turned on. When the tape breaks, the bin plunger is released and the contact is turned off. A C2 system has been proposed that uses a mechanical switch such as a switch to detect tape breakage, but at present no measures have been taken to detect tape jams. There is a need for a tape league that can also detect tape blockages.

OBJECTS OF THE INVENTION The present invention satisfies the above-mentioned needs, and its purpose is to make it possible to detect not only tape breaks but also tape blockages. Hereinafter, two examples will be described in detail.

Embodiment of the Invention FIG. 1 is a block diagram of an embodiment of the present invention, in which the present invention is applied to a capstan-driven tape league. Tape with sprocket holes and information holes, 2 is a capstan roller, 3 is a feed roller, 4 is a feed magnet, 5 is a brake magnet, 6 is a brake armature, 7 is a light emitting element, 8 is a sprocket hole and each information a light-receiving element group consisting of a plurality of light-receiving elements provided corresponding to the holes;
9 and 10 are transistors, 11 is an output device, 12 is an input device, and 16 is a microprocessor, etc. A processing device 16 includes transistors 9 and 10 when reading a tape.
Signals α and b, which contradict each other and become “1” and “0”, are applied to the base of the signal via the output device 11.

During the period when the signal α is "1", the transistor 9 is turned on, the feed magnet 4 is excited, and the feed roller 6 is pressed against the capstan roller 2, so that the tape 1 is fed in the direction of the arrow.

Further, during the period when the signal b is "1", the transistor 10 is turned on, the brake magnet 5 is excited,
Since the tape 1 is sandwiched between the brake magnet 5 and the brake armature 6, feeding of the tape 1 is stopped. The processing device 13 also performs a process of reading, via the input device 12, a signal from each light receiving element of the light receiving element group 8, which becomes "1" or '0' depending on the presence or absence of a sprocket hole or an information hole. .

The processing device 1'5 controls the feeding and stopping of the tape 1, the reading of information on the tape 1, and also monitors the running of the tape 1. FIG. 2 shows a flowchart of an example of tape running monitoring. .

The processing device 13 inputs the rising edge of the sprocket signal from the light receiving element corresponding to the sprocket hole of the light receiving element group 8 to the input device 12.
7, the count value of the internal counter is set to "0" and the count of one clock signal is started. After counting starts, if the signals α and b are not in the state of “0” and “1”, respectively, counting continues, and even if the count value of the counter reaches a predetermined value, the rise of the next sprocket signal cannot be detected. In other words, if the next rising edge of the sprocket signal cannot be detected even after a certain period of time (7'llJ, 2 seconds) has passed since the rising edge of the sprocket signal was detected, the tape has broken or the tape is running in the wrong direction. It determines that there is a blockage and outputs an alarm signal. This alarm signal lights up a warning light, sounds a warning buzzer, etc. Also, after the start of counting, when the signals α and b become “0” and “1”, respectively, the process returns to detecting the rising edge of the sprocket signal.If the sprocket signal α and the signal α are “1”, as shown in FIG. As shown in ζ2, C = "1" every certain period of time (usually about 2 mB136), so even if a certain period of time T has elapsed since the rising of the sprocket signal was detected, the rising of the next sprocket signal cannot be detected. If it cannot be detected, it is determined that the tape is cut or the tape is clogged, and an alarm signal is output to notify the operator of the abnormality.

In addition, if the next rise of the sprocket signal is detected before a certain period of time T has elapsed after detecting the rise of the sprocket signal, the counter is reset and the count value is set to ``0'', and the counter is reset to ``0'' as described above. Start counting the clock signal.

In the embodiment (=), a counter inside the processing device 13 is used to detect tape breakage, tape jam, and theft based on the count value of the counter, but this is not limited to this. It goes without saying that a counter having a similar function may be provided in the counter, and an abnormality may be detected based on the count value of the counter.Furthermore, a timer mechanism may be provided to perform the same operation as described above. is also possible.

Effects of the Invention As explained above, the present invention provides means for measuring the time from the rise of a sprocket signal to the rise of the next sprocket signal, and a tape reader based on the time measured by the means. Since it is equipped with a processing device that detects abnormalities in the tape, it has the advantage that it can detect not only tape breaks but also tape jams, which could not be detected conventionally.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the processing contents of the processing device, and FIG. 3 is a waveform diagram of sprocket signals. 1 is a paper tape, 2 is a capstan, 3 is a feed roller, 4 is a feed magnet, 5 is a brake magnet, 6 is a brake armature, 7 is a light emitting element, 8 is a group of light receiving elements, 9 and 10 are transistors, 11 is an input device,
12 is an output device, and 13 is a processing device. Patent applicant FANUC Corporation

Claims (1)

[Claims] In a tape league for reading information punched in a tape, a sprocket hole punched in the tape (= means for measuring the time from the rising edge of a corresponding sprocket signal to a rising edge of the next sprocket signal; Detecting that the measured time is longer than a predetermined time (Secondly, a tape league characterized by comprising a processing device for detecting an abnormality in the tape league.