JP3421506B2 - Tape braking control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a magnetic tape, and more particularly to a tape brake for fast-forwarding and rewinding a magnetic tape at high speed. Related to control technology. 2. Description of the Related Art Video tape recorders (hereinafter, VTRs)
In a device using a magnetic tape medium such as an audio tape recorder or an audio tape recorder, a cueing function and an editing function are often provided, and a tape fast forward (FF) and rewind (REW) operations are frequently performed. Done in Along with this, it has been required to increase the speed and reduce the noise of the FF and REW. In order to realize the high speed and the silent operation, a reel motor is used for each of the winding side and the supply side, and a drive circuit is mounted on each of them to independently control the start and stop of driving. Has been adopted. However, with such a mechanism, tape damage is likely to occur when stopping from a high-speed FF or REW state. [0005] For example, there is a reel control device used in the above-mentioned conventional VTR as shown in FIG. (1) is a magnetic tape, (2) is a supply side reel motor, and (3) is a take-up side reel motor. (4) a drive circuit for a supply-side reel motor;
(5) is a drive circuit for the take-up reel motor, and (6) is a control circuit that outputs a drive start command or a stop command for the two reel drive circuits independently. (9) is a brake drive circuit for applying a brake to both reel motors (2) and (3) in accordance with a stop command to stop. The following operations are performed by the reel control circuit when the operation is stopped from the FF state. During FF operation, the magnetic tape (1) is wound by the winding reel motor (3), and the supply reel motor (2) is slightly loaded so that the magnetic tape (1) does not slack. Is being braked. When stopping from this state,
The control circuit (6) outputs a circuit stop command (c) for the take-up reel motor (3) to the reel drive circuit (5), and the drive of the take-up reel motor (3) is completed. Further, at the same time or after a certain time after the rotation stop command (c), a rotation stop command (a) of the supply side reel motor (2) is output to the reel drive circuit (4), and the supply side reel motor (2) is controlled. Finish driving. A brake drive command (b) is output at the same time as or after a predetermined time after the rotation stop command (a), and both reel motors (2) and (3) are stopped. The same control is performed when the operation is stopped after the REW operation. That is, during the REW operation, the magnetic tape (1) is wound by the supply reel motor (2), and the winding reel motor (3) is wound by the magnetic tape (1).
It is braked so that a little load is applied so that it does not slack. When stopping from this state, the control circuit (6) outputs a circuit stop command (a) for the supply-side reel motor (2) to the reel drive circuit (4), and the supply-side reel motor (2) After the drive is completed, a rotation stop command (b) of the take-up reel motor (3) is output to the reel drive circuit (5) at the same time or after a certain time after the rotation stop command (a), and the take-up reel motor (3) Finish driving. A brake drive command (c) is output at the same time as or after a certain time after the rotation stop command (b), and both reel motors (2) and (3) are stopped. However, in such a control method,
The relationship between the tape winding diameters of the two reels is opposite, and the rotation speeds of the two reels are accordingly different, so that the tape tension in the stopped state is not constant due to the variation in the braking force, and the tape has a large Since tension may be applied, this causes tape damage. Further, two types of consumer digital VTRs, a standard cassette and a small cassette, are standardized, and those having different reel sizes are used. Therefore, when the size of the reel changes, the reel rotation speed and the operation state of the brake also change. Therefore, in the conventional method, there is a problem that the tape tension at the time of braking is different, and optimum tape-friendly braking control cannot be performed. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its technical object to eliminate tape damage that occurs when stopping from a high-speed FF or REW state. . According to the present invention, in order to solve the above-mentioned problems, a magnetic tape braking control device for running a high-speed tape comprises a drive circuit for driving a take-up reel and a tape tension. A tension detector for detecting, a braking device for applying a brake to the winding side and the supply side reel, and a control circuit for outputting a command to the driving circuit and the braking device, wherein the control circuit outputs a stop command to the driving circuit. Then, when the value of the tension detector falls below a predetermined value, a braking command is output to the braking device. Further, in the magnetic tape braking control device which performs high-speed tape running, a first drive circuit for driving the take-up reel, a second drive circuit for driving the supply-side reel, A first detection circuit for detecting the rotation speed, a second detection circuit for detecting the rotation speed of the supply reel, a tension detector for detecting the tension of the tape, and applying a brake to the take-up and supply reels A braking device, comprising a control circuit for outputting a command to the drive circuit and the braking device, when stopping from the tape fast-forward state, the control circuit outputs a stop command to the first drive circuit, After the output of the first or second detection circuit becomes equal to or less than a predetermined value, a stop command is output to the second drive circuit, and when the value of the tension detector becomes equal to or less than a predetermined value. And outputs a braking command to the serial braking device. In a magnetic tape braking control device that performs high-speed tape running, a first drive circuit for driving a take-up reel, a second drive circuit for driving a supply-side reel, A first detection circuit for detecting the rotation speed, a second detection circuit for detecting the rotation speed of the supply reel, a tension detector for detecting the tension of the tape, and applying a brake to the take-up and supply reels A braking device, and a control circuit that outputs a command to the driving circuit and the braking device. When stopping from the tape rewinding state, the control circuit outputs a stop command to the second drive circuit. After the output of the first or second detection circuit becomes equal to or less than a predetermined value, a stop command is output to the first drive circuit, and when the value of the tension detector becomes equal to or less than a predetermined value. And outputs a braking command to the serial braking device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 3,
An embodiment of the tape braking device according to the present invention will be described. (1) is a magnetic tape. (2) is a supply-side reel motor, around which the magnetic tape (1) is wound. (3) is a take-up side reel motor,
This is a reel for winding the magnetic tape (1). A supply-side reel motor driving circuit (4) is a motor driver for controlling a supply current to the supply-side reel motor (2). (5) is a take-up reel motor drive circuit, which is a motor driver for controlling the current supplied to the take-up reel motor (3). A control circuit (6) outputs a drive start command or a stop command independently to the supply-side reel motor drive circuit (4) and the take-up reel motor drive circuit (5). (7) is a supply side rotation speed detection circuit,
The speed is detected by obtaining a rotation pulse from a rotation sensor attached to the supply-side reel motor (2). (8) Speed detection is performed by obtaining a rotation pulse from a rotation sensor attached to the winding-side reel motor (3) and a winding-side rotation speed detection circuit. A brake drive circuit (9) brakes the supply-side reel motor (2) and the take-up reel motor (3). (10) is a tension value detection circuit,
A tension value is detected from a tension detector attached to the traveling system. The operation will be described below. First, when stopping from the FF operation state, the following is performed. During the FF operation, the magnetic tape (1) is wound by the winding reel motor (3). The supply side reel motor (2) is controlled so that a slight load is applied so that the magnetic tape (1) does not slack. When shifting to the stop state (for example, VTR
When the STOP button is pressed), the control circuit (6) outputs a rotation stop command (c) of the take-up reel motor (3) to the drive circuit (5), and the take-up reel motor (3) ) Is interrupted. As a result, the magnetic tape (1) continues to be wound by inertia, and the winding speed gradually decreases due to the load of the supply-side reel motor (2). In this state, when the speed is detected by the supply-side rotation speed detection circuit (7) or the winding-side rotation speed detection circuit (8) and becomes lower than a predetermined speed, a signal (d) or a signal is sent to the control circuit (6). (F) is output. A detection circuit (10) of a tension detector (not shown) detects a tape tension value during tape running, and when the detected tension value falls below a predetermined tension value, a signal (h) is sent to a control circuit (6). Is output. When the control circuit (6) detects the signal (d) or (f) and the signal (h), it immediately outputs the rotation stop command (a) of the supply side reel motor (2) to the reel drive circuit (4). Then, the drive of the supply-side reel motor (2) ends. A brake drive command (c) is output from the control circuit (6) at the same time or after a certain time after the rotation stop command (a), and a mechanical brake (for example, a pad) is applied to both reels (2) and (3). Brake). FIG. 3 shows the structure of the pad brake. The pad (11) is affixed to the tip of the link (12) and cuts into the peripheral surface of the reel base (16) by the force of the spring (13) to apply a braking force. To release the braking force, the link (12) is rotated by the movement of the iron core (15) of the solenoid (14) in the direction of arrow A, and the pad (11) is moved to the reel base (1).
Leave 6). Next, the case of stopping from the REW operation state will be described. In the case of the REW operation, the same control as in the case of the FF is performed. That is, during the REW operation, the magnetic tape (2) is wound around the supply reel motor (2), and the winding reel motor (3) is wound around the magnetic tape (1).
It is controlled so that a little load is applied so as not to sag. When stopping from this state, for example,
When the STOP button of the VTR is pressed), the control circuit (6) outputs a rotation stop command (a) of the supply-side reel motor (2) to the drive circuit (4) to drive the supply-side reel motor (2). Ends. At this point, the magnetic tape (1) continues to be wound by inertia, and the winding speed gradually decreases due to the load of the winding-side reel motor (3). This state is detected by the rotation speed detection circuit (7) or (8), and when the speed becomes lower than the set speed, a signal (d) or (f) is output to the control circuit (6). Separately from this, the detection circuit (1) of a tension detector (not shown) detects the tape tension value during tape running.
0), the signal (h) is output to the control circuit (6) when the tension value becomes equal to or less than the set tension value. When the control circuit (6) detects the signal (d) or (f) and the signal (h), it immediately sends a rotation stop command (c) of the take-up reel motor (3) to the reel drive circuit (5). Output, and the drive of the take-up reel motor (3) ends. A brake drive command (c) is output from the control circuit (6) at the same time as or after a certain time after the rotation stop command (b), and a mechanical brake (for example, a pad brake) is applied to both reels (2) and (3). ) Apply force. As described above, according to the tape controller of the present invention, the braking timing of the mechanical brake is determined by monitoring the rotation speed of the reel and the tape tension value. Is small and excessive tension is not applied to the tape by braking, so that damage to the tape can be prevented. Therefore, even if the reel is rotated at a speed higher than that of the conventional FF or REW reel, the braking control can be performed without damaging the tape. An apparatus using a magnetic tape such as a VTR can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a tape braking control device according to the present invention. FIG. 2 is a block diagram of a conventional tape braking control device. FIG. 3 is a configuration diagram of a pad brake according to the tape braking control device of the present invention. [Explanation of Codes] 1. magnetic tape 2. Supply side reel motor 3. Take-up reel motor 4. Supply reel motor drive circuit 5. Take-up side reel motor drive circuit Control circuit 7. 7. Supply-side rotation speed detection circuit Winding side rotation speed detection circuit 9. Brake drive circuit 10. 10. Tension value detection circuit Brake pad 12. Link 13. Spring 14. Solenoid 15. Iron core 16. Reel stand

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenji Yamanaka 2-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-62-141669 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 15/43

Claims (1)

(57) [Claim 1] In a braking control apparatus for a magnetic tape performing high-speed tape running, a reel motor for winding the magnetic tape around a reel, a reel motor driving circuit for driving the reel motor, A tension detector that detects the tension of the magnetic tape; a rotation speed detector that detects the rotation speed of the reel; a braking device that mechanically brakes the reel; and a reel motor drive circuit and the braking device. A control circuit for outputting a command, wherein when the rotation speed detector becomes equal to or less than a predetermined value and the detection value of the tension detector becomes equal to or less than a predetermined value, the control circuit issues a stop instruction to the reel motor drive circuit. A tape braking control device, which outputs a braking command to the braking device after outputting.