JPS61144746A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To stop a tape at an accurate position regardless of the rest of the tape on a reel by reversing a reel turntable by the number of its inertial turns and stopping the tape. CONSTITUTION:The 1st reverse counter 12 counts reel pulses after the 1st stop signal is generated. A detecting circuit which is not shown in a figure detects the output of a reel pulse generating circuit 6 not being generated for a certain period and a command for low-speed reversing is supplied to a capstan driving circuit 10 in response to the detection output. The 2nd reel pulse counter 13 counts the output of the circuit 6 during this reversing period and a relative operating element 14 detects the coincidence between the counted values of the counters 12 and 13. Then, a control signal generating circuit 9 is driven with its detection output to generate the 2nd stop signal which stops a motor 11 completely. Consequently, the tape is stopped at an accurate position regardless of the rest of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a tape drive system for a magnetic recording/reproducing apparatus, and particularly to a tape drive system for stopping a tape accurately at a predetermined position.

BACKGROUND OF THE INVENTION A conventional tape running stop device has a counter that sequentially counts the pulses generated as the reel table rotates, and a microcomputer detects when the counter value matches a predetermined value. etc., and issues a command to stop the rotation of the capstan motor, thereby stopping the rotation of the reel stand being rotated by the capstan motor.

Problems to be Solved by the Invention However, with the above configuration, the microcomputer issues a command to stop the capstan motor at the same time it detects that the counter value matches the set value, and even if an attempt is made to stop the rotation of the reel stand, However, since the reel stand rotates excessively due to inertia, there is a problem in that the rotation of the reel stand does not necessarily stop exactly at a predetermined position.

In view of the above problems, the present invention has been developed by rotating the reel in the opposite direction after the reel has been rotated due to inertia after receiving a command to stop the reel. It was designed so that it could be stopped.

Means for Solving the Problems In order to solve the above problems, the tape drive device of the present invention includes a counter that counts pulses generated as the reel base rotates, and a count value of the counter that is predetermined. means for generating a command signal to stop the rotation of the capstan motor when the command signal is generated, a first count value that counts the number of reel pulses until the reel stand completely stops after the generation of the command signal, and a rotation of the reel stand. After it has completely stopped, rotate the capstan motor to rotate the reel stand in the opposite direction.
It is characterized in that the rotation of the capstan motor is stopped when the second count value obtained by counting the reel pulses during that period coincides with the second count value.

Effect: With the above-described configuration, the present invention rotates the reel stand in the opposite direction by the amount that the reel stand rotates due to inertia, thereby making it possible to accurately stop the reel stand at a predetermined position. It becomes possible.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. Figure 1 is a time chart showing the timing of the signal that controls the rotation direction of the capstan motor and the reel pulse input to the microcomputer. In Figure 1, 1 is the signal that limits the rotation direction of the capstan motor. Capstan motor rotates forward at urHJ level, reverse 1rM at "L" level
It is in stationary mode at J level. Further, 2 is a reel pulse signal generated as the reel rotates, 3 is an input pulse to a first reel pulse counter in the microcomputer, and 4 is an input pulse to a second reel pulse counter in the microcomputer. FIG. 2 is a block diagram of the main parts of the present invention, and the part inside the dotted line is inside the microcomputer. FIG. 3 is a flowchart of the apparatus of the present invention, where RPCl is the number counted by the first reel pulse counter, and RPC2 is the number counted by the second reel pulse counter.

The operation will be explained below with reference to FIGS. 1 and 2.

First, a predetermined value is input into the setting circuit 5 using a keyboard or the like.

When the tape is driven in this state, the reel pulse generation circuit 6 generates pulses in accordance with the rotation of the reel stand.

These pulses are sequentially counted by a third counter 7, and when it is determined that the counted value matches the setting value of the setting circuit 6, a first comparison calculation circuit 8 is used to detect the stopper, the cap, and the cab scan drive control signal generation circuit. 9 and applies a first stop signal to the capstan motor drive circuit 1o.

However, as described above, the capstan motor 11 suddenly stops rotating in conjunction with the application of the stop signal, and in order to detect the number of rotations, the first rail pulse counter 12 detects the number of rotations after the first stop signal is generated. Count the glue pulses.

On the other hand, the complete stop of the reel stand is detected by means (not shown), such as detecting that the output of the reel pulse generating circuit 6 is not generated for a certain period of time, and this detected output is used to detect the cap. A command for reverse rotation at low speed is given to the stand drive circuit 10.

During this reversal period, the second reel pulse counter 13 counts the output of the reel pulse generation circuit 6, and performs a second comparison operation to determine that the counted values of the second and third reel pulse counters 12 and 13 match. This detection output drives the control signal generation circuit 9 to generate a second stop signal that completely stops the motor 11.

Effects of the Invention As described above, according to the present invention, the tape is stopped by rotating the tape in the opposite direction by the number of rotations due to the inertia of the reel stand, regardless of the amount of tape remaining on the reel. It is possible to stop the tape at a precise position.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of an embodiment of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a block diagram of the essential parts of the embodiment, and FIG. 3 is a flowchart of the embodiment. 6... Setting circuit, 6... Reel pulse generation circuit, 7... Counter, 8, 14...
... Comparison calculator, 9 ... Capstan drive control signal generation circuit, 10 ... Capstan motor drive circuit, 11 ... Capstan motor, 1
2.13...Reel pulse counter. Name of agent: Patent attorney Toshio Nakao and one other name
1I21 iKZ diagram

Claims (1)

[Claims] a pulse generating means that generates a pulse signal as the reel base rotates; and a first pulse generator that sequentially counts the pulse signal and stops the reel base when the counted value reaches a predetermined value. means for generating a stop command signal; counting means for counting the pulse signals after generation of the first stop command signal; and counter means for counting the pulse signals after generation of the first stop command signal; means for driving the reel stand in the opposite direction, and means for counting the pulses during driving in the opposite direction and generating a second stop command signal for stopping the reel stand when the pulses match the count value of the counting means. A magnetic recording and reproducing device consisting of.