JPH0479052A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To securely protect a tape by comparing an revolving speed of a drum with a predetermined revolving speed and stopping the drum motor in the case of a difference between these speeds. CONSTITUTION:When a cylinder drum 1 is rotated, this revolving speed is detected by a detecting means 11, and its result is impressed upon a control means 12. Now, if the tape 8 is under the state of sticking to the cylinder drum 1, the revolving speed of the cylinder drum 1 is lowered or stopped. Consequently, since the above revolving speed detected by the detecting means 11 is not conformed with the specified one, a drum motor driving means 9 is stopped in its drive by the control means 12, so that the revolution of the drum motor is stopped. Therefore, under such a state that the cylinder drum 1 or the tape 8 has a fingerprint or dew condensation and is stuck to each other, even when the cylinder drum 1 is to be rotated, a reel is braked, and the tape 8 is not drawn out. By this method, the tape is never wrapped around, and hence no damage is given to the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a digital audio tape recorder (DA
T) relates to magnetic recording and reproducing devices such as video tape recorders (VTRs).

Conventional Technology Generally speaking, in this type of magnetic recording/reproducing device, if fingerprints or dew adhere to the cylinder drum or tape, this will cause the cylinder drum and tape to adhere to each other, causing the tape to get caught up in the cylinder drum. There was a problem with the tape drive not being able to be used. For this reason, conventionally, in this type of magnetic recording/reproducing apparatus, when the tape is wound up, it is immediately detected and the rotation of the drum is stopped to prevent further winding.

However, in the above-mentioned conventional magnetic recording and reproducing apparatus, abnormality in the rotation of the tape reel or cylinder drum is detected only after the tape has been wound up.
By the time it was detected, a portion of the tape had already been rolled up.
There was a problem with the tape being damaged.

The present invention solves these conventional problems,
The purpose of this invention is to provide an excellent magnetic recording and reproducing device that detects the possibility of tape winding before it winds up in a cylinder drum, stops the cylinder drum at this point, and reliably protects the tape. That is.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a cylinder drum incorporating a magnetic head, a drum motor for rotating the cylinder drum, a reel motor for rotating a chief reel, and a cylinder drum for rotating the cylinder drum. a drum motor drive means for rotating and stopping the sole motor, a reel motor drive means for rotating and stopping the sole motor, a detection means for detecting the number of rotations of the drum motor, and a rotation of the drum motor detected by the detection means. and a predetermined number of rotations, and a control means for stopping the drum motor at a different location/base via a drum motor drive means.

According to the present invention, the brake is applied to the reel when the cylinder drum starts rotating, so if there are fingerprints or condensation on the cylinder drum or tape and they are stuck together, the tape will It has the function of detecting that an abnormality has occurred in the rotation of the cylinder drum and stopping the rotation of the drum, thereby preventing the tape from being pulled out.

Embodiment FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. 1st
In the figure, 1 is a cylinder tram equipped with recording and reproducing heads, and is rotated by a tram motor (not shown). Reference numerals 2 and 3 denote a tape supply reel and a tape take-up reel, which are rotated by a tape supply reel motor and a tape take-up reel motor (both not shown), respectively. 4 is a capstan which is pressed against the pinch roller 7 to run the tape 8 at a constant speed during recording and reproduction. 5.5
a is a loading post on the supply side, 6.6a is a loading post on the winding side, and when loading the tape, the tape 8 is moved from the position 15.15a116.16a shown by the dotted line in the direction of arrows A and H. and move. A pinch roller 7 is pressed against the capstan 4 during recording and reproduction. Reference numeral 9 denotes a drum motor drive means for rotating and stopping the drum motor. Reference numeral 10 denotes a reel motor drive means for rotating and stopping the tape supply reel motor and tape take-up reel motor. Reference numeral 11 denotes a detection means, which detects the number of rotations of the drum motor. Reference numeral 12 denotes a control means, which compares the rotation speed of the drum motor detected by the detection means 11 with a preset rotation speed (hereinafter referred to as a predetermined number), and if there is a difference between them, controls the drum motor drive means. 9, the drum motor is stopped.

Next, the operation of the above embodiment will be explained using the flowchart shown in FIG. 2 and the reproduction operation as an example. first,
When the tape cassent is inserted through the insertion port (not shown) (step a), the supply side loading post 5.5a and the winding side opening post 6.6a are accompanied by the tape 8.
Positions 15.15a and 16.16 indicated by dotted lines in Figure 1
Move from a in the directions of arrows A and B. Therefore, the tape 8 comes into contact with the side surface of the cylinder drum, and the tape loading operation is completed (step b). When the chief loading operation is completed, the reel motor drive means 10 electrically or mechanically brakes the tape supply reel motor and the tape take-up reel motor (step c), and in this state, the drum motor drive means 9 is driven. Then, the drum motor rotates, and the cylinder tram 1 also rotates (step d). Note that at this time, the brake may be applied only to the tape supply reel. When the cylinder drum 1 rotates, its rotational speed is detected by the detection means 11, and the result is applied to the control means 12. The control means 12 compares the rotation speed of the cylinder drum 1 with the predetermined number (step e). Here, if there is dew condensation or fingerprints on the cylinder drum 1 or the tape 8, and the tape 8 or the cylinder drum 1 is adhered to it, this becomes a load on the rotation of the cylinder drum 1. The rotation speed of
It doesn't rotate. Therefore, since the rotational speed detected by the detection means 11 does not match the predetermined number, the control means 12 stops the drum motor drive means 9,
Stop the rotation of the drum motor (step h). Then, processing such as injecting the tape cassette (step l) is performed, and the tape is taken out without damaging the tape. Further, if the number of rotations of the cylinder tram 1 is equal to the above-mentioned predetermined number, the operation is normal, so the brakes applied to the tape supply reel motor and the tape take-up reel motor are released by the reel motor drive means 10 ( step f), start playing the tape (step g);

According to this embodiment, if the cylinder drum 1 or the tape 8 has fingerprints or condensation and is stuck to each other, even if the cylinder drum 1 tries to start rotating, the reel will not be braked. Tape 8
This has the effect that the tape 8 is not pulled out and the tape 8 is only rolled up, so that the tape 8 is not damaged.

In this embodiment, the number of rotations of the cylinder drum 1 is compared with a predetermined number;
If a current value different from the current value passing through the drum motor in a normal state in which the drum motor is not bonded is detected, the processing from step h described above may be performed.

Further, in this embodiment, a motor is provided independently for each of the tape supply reel and the tape take-up reel, or the two reels may be driven by a single motor.

Effects of the Invention As is clear from the above embodiments, if the cylinder drum or tape has fingerprints or condensation and is stuck to each other, even if the cylinder drum starts to rotate, the reel will not be able to brake. , the tape is not pulled out, the tape does not wind up, and the tape is not damaged.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the main parts of an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of this embodiment. 1... Cylinder drum, 2... Tape supply reel, 3... Tape take-up reel, 4...
... Capstan, 5.5a ... Supply side loading post, 6.6a ... Winding side opening post, 7 ... Pinch roller, 8・
... Tape, 9 ... Drum motor drive means, 10 ... Reel motor supply means, 11 ...
. . . Detection means, 12 . . . Control means. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1 1/Ring drum

Claims (2)

[Claims] (1) A cylinder drum equipped with a magnetic head, means for applying a brake to at least one of a tape supply reel and a tape take-up reel when the tape loading operation is completed, and a means for applying a brake to at least one of the tape supply reel and the tape take-up reel when the tape loading operation is completed; means for driving the drum; means for detecting the rotational speed of the cylinder drum in this state; means for comparing the rotational speed with a predetermined rotational speed; and means for detecting the rotational speed of the cylinder drum when the results of the comparison do not match. and means for releasing the brake when the results of the comparison match. (2) The magnetic recording and reproducing apparatus according to claim 1, further comprising means for detecting a current value of a drum motor that rotates the cylinder drum, and means for comparing said current value with a predetermined current value.