JPS61227257A - Tape loading discriminating method - Google Patents

Abstract

PURPOSE:To discriminate the abnormal device of a tape easily and without fail by detecting repeatedly the winding diameter of the tape wound to the reel from a reel rotation detecting means and a tape travelling detecting means, counting the continuous number when the winding diameter of the same diameter, and calculating the difference between both winding diameters when the winding diameter is different. CONSTITUTION:At respective slit disks 9-11, detecting devices 13-15 to detect a slit 12 are arranged, the detecting device sandwiches respective slit disks, arranges a light emitting element and a photodetecting element in opposite to a pair each, detects the number of the slits 12 and detects the number of rotations of respective slit disks 9-11. A micro processor 18 repeatedly detects the winding diameter of the tape wound by the reel of at least either of a reel rotation detecting means to detect the rotation of respective reels composed of a detecting device 13 provided at a supply side reel 1 of a detecting device 14 provided at a winding side reel 2, and a tape travelling detecting means to detect the travelling of a tape 3 composed of a detecting device 15 provided at a roller 4, and the insertion of the tape is discriminated in accordance with the result.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applicable to, for example, open-reel tape recorders and VT
The present invention relates to a tape mounting determination method for determining whether or not a tape is normally loaded in a tape running device such as R.

[Background technology of the invention]

General (: In a tape running device, the tape is unwound from a supply reel and wound onto a take-up reel, and a tape running path between the supply reel and the take-up reel is equipped with a cap. Various components such as stuns, pinch rollers, tape guides, magnetic heads, etc. are arranged.A device is installed in the tape running device so that the tape runs through the parts arranged in this tape running path in a preset order. However, if the tape is not installed completely, abnormally high tension may be applied during operation, which may damage the tape or other parts.

As a conventional technique for determining whether or not the tape is properly installed, for example, Japanese Patent Application Laid-Open No. 143557/1983 discloses a technique for determining whether or not the tape is properly installed within the tape running path.

A timer low 2 is provided to detect whether or not the tape is running and the direction in which the tape is running. 1. By comparing the selected operation mode such as play mode, fast forward, etc. with the actual tape running speed and direction, the tape The installation status of the device is determined.

[Problem that the invention seeks to solve]

However, although this conventional method can determine whether or not the tape is correctly attached at the start of operation, if the tape starts to wrap around the timer roller or comes off the reel, There is a problem that abnormalities cannot be detected or that it takes time to detect them.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and is a tape attachment determination method that determines whether the tape is attached abnormally, such as when the tape is slipping or when the tape comes off while the tape is running. The purpose is to provide a method.

[Summary of the invention]

The outline of the present invention for achieving the above object includes a reel rotation detection means for detecting the rotation of a reel on which a tape is wound, and a tape running detection means for detecting the length of the tape that has run, The winding diameter of the tape wound on the reel is repeatedly detected from the means and the tape running detection means, and when the winding diameters of the same diameter are consecutive, the number of consecutive windings is counted, and when the winding diameters are different, the diameter of both windings is counted. The difference is calculated, and when the difference in the number of consecutive turns or the difference in the winding diameter exceeds a predetermined value, the attached state of the tape is determined to be abnormal.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The tape 3 is a side reel, and the roller 4 rotates once or twice as the tape 3 runs. The tape 3 is wound onto a supply reel 1 and a take-up reel 2 via a capstan 5 that determines the running speed of the tape 3. The supply reel 1 and the take-up reel 2 are each rotationally driven by a reel motor 6 , 7 , and the capstan 5 is rotationally driven by a capstan motor 8 . Coaxially rotating slit discs 9, 10.11 are respectively fixed to the rotation shaft of the reel motor 6.7 and the roller 4, and slit discs 9, 10.11 are spaced at equal intervals around the circumference of each disc 9, 10.11. A large number of detection slits 12 are formed.

Further, each slit disk 9, 10, 11 is provided with a detector 13, 14, 15 for detecting the slit 12, and this detector is provided with a pair of light emitting element and light receiving element, for example, with each slit disk sandwiched therebetween. The number of slits 12 is detected by arranging the slits 12 in pairs, and the number of rotations of each slit disk 9, 10.11 is detected.

Reference numeral 16 denotes an input control circuit which converts the rotational speed of each disc 9, 10, 11 outputted from the detectors 13, 14, 15 into an electrical signal and outputs it to a microprocessor to be described later. The input control circuit 16 (2) is also connected to other detectors, operation switches, etc. (not shown), and these signals are also output to the microprocessor.

17 is an output control circuit, which is connected to the reel motor 6.7, the capstan motor 8, and a plunger, motor, lamp, etc. (not shown).

The devices are driven according to the output of the microprocessor.

18 is a microprocessor, which includes reel rotation detection means for detecting the rotation of each reel, consisting of a detector 13 provided on the supply reel l or a detector 14 provided on the take-up reel 2; Tape running detection means for detecting the running of the tape 3 is comprised of a detector 15 provided on the roller 4.

The winding diameter of the tape wound on at least one of the reels is repeatedly detected, and depending on the result, it is determined whether the tape is attached.

The operation of the present invention with the above configuration will be explained using the flowcharts of FIGS. 2 and 3.

First, supply side reel 12 take-up side reel 2. and roller 4
The number of rotations is detected as a pulse proportional to the number of rotations by detectors 13, 14, and 15 attached to each. This pulse is sent to the microprocessor via input control circuit 16. The method of determining the winding diameter of the tape 3 wound on the reel from these detectors 13, 14, and 15 will be described later, but below we will explain how to determine the mounting state of the tape based on the winding diameter of one of the reels. do. Note that the diameter of one roll is equivalent whether detected on either the supply reel 1 or the take-up reel 2, so in this embodiment, the winding diameter of the supply reel 1 is detected.

While the tape is running, in step 20, gA of the tape 3 wound on the supply reel 1 is set as a variable R1, which is the winding diameter detected the first time, and in step 21, the second gA is set as a variable R1.
Set the winding diameter of the second turn as R2. Step 22 compares the winding diameters R1 and R2 of the first and second windings. R
1 and R2 are different, in step 23, R1
Count value RD of the same diameter counter to be added when and R2 are equal
Reset. On the other hand, when R1 and R2 are equal, in step 24, 1 is added to the count value RD of the same diameter counter. While the tape 3 is running, the winding diameter must change sequentially, and the winding diameter R1 detected repeatedly in this way
If and R2 are continuously equal, it means that the tape is not installed properly. Therefore, in step 25, when the added count value RD exceeds a preset value REF, it is determined that the tape is abnormally loaded, and in step 26, processing for abnormal loading of the tape 3 is performed. For example, the specific process is to stop the tape 3 from running and turn on a lamp indicating a mounting abnormality. This operation is performed via the output control circuit 17.

Further, if R1 and R2 are different in step 22, step 27 calculates the difference between R1 and R2, and compares whether or not this difference exceeds a preset value. That is, if the tape 3 is normally attached by VC, the values of IR and -R21 are small and continuous. but.

If the tape 3 is attached abnormally, the difference between R1 and R2 becomes discontinuous and may suddenly exceed DX4/. In this case, abnormality processing is performed in step 26. If the difference between the winding diameters R1 and R2 is within a predetermined value, it is assumed that the veN state of the tape 3 is normal, and step 28 is performed to determine the second winding diameter. The first new winding diameter is detected in step 21 as the first winding diameter. In this way, the detection of the first winding diameter is repeated, and the latest winding diameter is R2 and the previous winding diameter is R1. The mounting state of the tape 3 is then determined.

Next, detection of the winding diameters R1 and R2 (hereinafter referred to as B) will be explained.

First, in step 30, a reel counter that counts pulses output from the detector 13 provided on the supply reel 1 is reset. Step 31 resets a roller counter that counts pulses output from the detector 15 provided on the roller 4.

When a pulse is output from the detector 13 in step 32,
Step 34 is the reel count value RE of the reel counter]
Add 1 to 1i2L. Further, when a pulse is output from the detector 15 in step 33, 1 is added to the roller count value R of the roller counter in step 36. Step 3
5 is the reel count value RE.

Determine whether EL exceeds a preset value T,
If it exceeds, the roller count value R is output as the winding diameter. That is, in certain modes such as play mode and fast-forward mode, the rotation speed of the roller 4 is almost constant, but the rotation speed of the supply reel 1 is fast when the winding diameter is short and slow when it is long.

Therefore, by detecting the roller count value R for each predetermined reel count value T, this count value R can be made to correspond to the winding diameter. In this way, the winding diameter R can be detected from the pulses output by the detectors 13 and 15.

Note that the processing cycle from steps 32 to 35 is based on the detector 13.
Since the period is shorter than the expected shortest period of the pulses outputted from 15 and 15, accurate winding diameter R can be detected. Also,
The predetermined reel count value T can be appropriately set depending on the interval between the slits 12 of the slit disks 9 and 11, the diameter of the reel 1, and the diameter of the row 24. Furthermore, if the numerical value REF in step 25 is set to 10, for example, then step 20.21
If the winding diameters R1 and R2 detected as the same diameter are detected 10 times, it is determined that the tape mounting state is abnormal. In this case, if the numerical value REF'' is decreased by 4f, abnormal tape loading can be determined in a short time. Since it is not practical if the value is too high, the value of REF is set in accordance with the mechanical characteristics of the tape transport device.

Also, if you set the value in step 27 to 4, for example,
When the difference between the successively detected winding diameters R1 and R2 becomes 4 or more, the tape mounting is determined to be abnormal. In this case as well, the value of D is set according to the characteristics of the tape running device.

[Other Examples]

The present invention is not limited to the above embodiments.

Various modifications can be included within the scope of the invention. For example, in FIG. 82, steps 22 and 27 may be reversed in order. Further, the winding diameter may be detected by using the take-up reel 2 or by combining both reels 1 and 2.

〔Effect of the invention〕

As described in detail above, according to the present invention, the winding diameter of the tape wound on a reel is repeatedly detected, and the number of consecutive windings of the same diameter is detected, or the number of windings of the tape when the winding diameters are different. When the difference in diameter exceeds each predetermined value, it is determined that the tape installation is abnormal, so if the tape slips on the roller at the beginning of tape running, or if the tape comes off from the reel etc. during tape running. It is possible to provide a tape attachment determination method that can easily and reliably determine abnormal attachment of a tape such as the following.

[Brief explanation of drawings]

3 is a flowchart illustrating the operation of a microprocessor. 1... Supply side reel % 2... Take-up side reel, 3
...Tape, 4...Roller, 9,10.11.
...Slit disk% 12...slib), 13,1
4.15...Detector, 16...Input control circuit, 1
7...Output control circuit. 18...Microprocessor.

Claims (1)

[Claims] A reel rotation detection means for detecting the rotation of a reel on which a tape is wound, and a tape running detection means for detecting the length of the tape that has run; The winding diameter of the tape is repeatedly detected, and if the winding diameters of the same diameter are consecutive, the number of consecutive windings is counted. If the winding diameters are different, the difference between the two winding diameters is detected, and the number of consecutive windings or the winding diameter is counted. A tape attachment determination method characterized in that the tape attachment condition is determined to be abnormal when the difference exceeds each predetermined value.