JPH0349067A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a joint between a leader tape or a trailer tape and a magnetic tape from coming into contact with a magnetic head by providing leader tape and trailer tape detecting means, a magnetic tape rewinding means and control means. CONSTITUTION:Upon loading a tape, a trailer tape detecting circuit 41 and a leader tape detecting circuit 43 start to work, and when the leader tape is detected, a supply motor is driven while releasing it from a main brake, and the tape is taken up until the magnetic tape 2 is detected, resuming the loading. And, when the trailer tape is detected, a take-up motor is driven while releasing it from a main brake, and the tape is rewound until the magnetic tape is detected, resuming the loading. Consequently, the joint between the leader tape or the trailer tape and the magnetic tape 2 is prevented from flawing due to contact with the rotary magnetic head, and the device can be miniaturized by shortening the tape guide span.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is applicable to video tape recorders (VTRs) and rotary head type digital audio chips, which record and reproduce data by winding a magnetic tape around a rotating drum having a magnetic head. The present invention relates to a magnetic recording/reproducing device using a helical scan method, such as a recorder (R-DAT).

[Prior Art] FIG. 4 is an explanatory diagram showing an outline of a conventional magnetic recording/reproducing device.

In Fig. 4, 1 is a cassette half in which a magnetic tape is stored, 2 is a magnetic tape for recording and reproducing signals (hereinafter referred to as tape), and 3 is a cassette bar and a cassette bar.
71 is a tape guide post for regulating the position; 4 is a tension detection bin for tension control; 5 is a guide roller; 6 is a slant ball for three-dimensionally running the tape 2; 7 is a drum equipped with a rotating magnetic head. , 8 is a slant ball similar to slant ball 6, 9
is a guide roller similar to guide roller 5.

10 is a pinch roller that generates friction force to feed the tape 2; 11 is a capstan that controls the running speed of the tape 2; 12 is a tape guide post similar to the tape guide post 3; 13 is a tape guide post that is used during normal recording and playback. A stop supply reel 14 is a take-up reel for winding up the tape 2 during normal recording and playback. 8
．． In cassettes such as , VTR, VHS, and R-DAT, adhesive tape and trailer tape are provided at the beginning and end of the magnetic tape section, making it possible to detect the end of the magnetic tape. however,
During or after loading, there is a high possibility that the rotating magnetic head will come into contact with the gap between the leader tape or trailer tape and the magnetic tape, causing damage to the single rotation magnetic head. Therefore, the layout as shown in Figure 4 is recommended. For example, in R-DAT, a section of length 60□±5□ of the leader tape and trailer tape was avoided.

[Problems to be Solved by the Invention] In the conventional magnetic recording/reproducing device as described above, in order to prevent damage to the rotating magnetic head, the tape guide span is lengthened.
The spacing between the leader tape or trailer tape and the magnetic tape was such that it did not touch the rotating magnetic head, which was an obstacle to the compact size of the device.

The present invention has been made to solve such conventional problems, and it is possible to prevent the gap between the leader tape or trailer tape and the magnetic tape from being exposed to the rotating magnetic head,
Another object of the present invention is to provide a magnetic recording/reproducing device that can be made compact.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic recording and reproducing apparatus, a means for detecting a transfer tape and a trailer tape, and a magnetic tape wound on a supply reel or a take-up reel. and a control means for winding or rewinding the tape based on the result of the detection means at the start of tape loading.

[Function] With the above configuration, when the leader tape detection means detects a leader tape, the supply motor is driven to wind up the tape, and when the trailer tape detection means detects a trailer tape, the supply motor is driven to take up the tape. Since the tape is rewound by driving the motor, the joint between the leader tape or trailer tape and the magnetic tape is prevented from being exposed to the rotating magnetic head.

[Embodiment] FIG. 1 is an explanatory diagram showing a schematic configuration of the main parts of a magnetic recording/reproducing apparatus which is an embodiment of the present invention, and FIG. 2 is a flowchart showing an outline of the logic of a system control circuit of the present invention. be. FIG. 3 is a schematic diagram of the mechanism of the apparatus of the embodiment shown in FIG.

3, 15 is a main brake for braking the reel, 18 is a loading motor equipped with a pulley, and 17
18 is a rubber belt for transmitting the power of the loading motor 16; 18 is a pulley having a coaxial gear; 19
, 20.21 is a deceleration gear that decelerates the rotation of the loading motor, 22, 24, 25, 26, 32, 36° 37 is a gear train for power transmission, and 23.38 is a tape guide post. gear, 27.
31 is a spring that defines the loading pressure; 2;
8.29 and 33.34 are refractive link mechanisms for loading, 30 are skates that carry the slant bin 8 and guide roller 9, 35 are skates that carry the guide roller 5 and slant pin 6, 39 is a light emitting element, and 40.42 is this light emitting element. The optical path from 39, 41.43 is the respective optical path 40.4
These are a trailer tape detection circuit and a leader tape detection circuit, which detect the seam of the tape by receiving light from the tape with a light receiving element.

A specific example of means for detecting the leader tape and trailer tape will be described.

The magnetic tape is not transparent to the light from the light emitting element 39, but the leader tape and trailer tape connected to the ends (starting end and ending end) of this magnetic tape are transparent. Therefore, at the joint between the magnetic tape and the leader tape and trailer tape connected to its ends,
This can be determined by detecting the light from the light emitting element 39 with a trailer tape detection circuit 41 or a leader tape detection circuit 43 that forms a photocoupler.

The operation of one embodiment of the present invention will be explained below using the flowchart shown in FIG.

In FIG. 2, tape loading is started by inserting a cassette tape into the device (31), and at the same time, the trailer tape detection circuit 41 and leader tape detection circuit 43 shown in FIG. At this time, if it is determined that the tape is a magnetic tape, the main brake is released, the loading motor is rotated forward (S4), the loading is completed (SS), and the next step is to Preparation for recording/reproduction, etc. is made (S6).

However, when the leader tape is detected, the main brake is released (S7), the supply motor is driven (S8J), winding is performed until the magnetic tape is detected (S9), and loading is resumed (S4). Similarly, when the trailer tape is detected, release the main brake (510), drive the take-up reel (5:11), and rewind until the magnetic tape is detected.
S12), loading is resumed (S4).

[Effects of the Invention] As explained above, the present invention provides a means for detecting the tape and trailer tape, a means for rewinding the tape, and a means for controlling the whole. This has the effect of making the device more compact without requiring a rotating head.

[Brief explanation of drawings]

FIG. 1 shows a magnetic recording/reproducing system which is an embodiment of the present invention. FIG. 2 is a flowchart schematically showing the logic of the system control circuit of the present invention; FIG. 3 is a schematic diagram of the mechanism of the device of the embodiment shown in FIG. 1; FIG. 4 is an explanatory diagram showing an outline of a conventional magnetic recording/reproducing device. In the figure. Kase! )-8-F Magnetic tape 12: Tape guide post tension detection bin 9 Guide roller 6.8 Nislant ball 7 Second drum 10: Pinch roller +l: Cab stun 13: Sub reel 14: Take-up reel 15: Main brake 16 :Loading motor 17:Rubber belt 18:Fullies 19-2B, 32. Coro, 31. 8: Gear 2B, 2
9, 33, 34: Link 27, Koni: Springco 0, 35 Niskate

Claims (1)

[Claims] In a magnetic recording and reproducing device that records and reproduces data by spirally winding a magnetic tape around a drum equipped with a rotating magnetic head,
means for detecting leader tape and trailer tape; means for winding or unwinding the magnetic tape wound on the supply reel or take-up reel; and winding or rewinding of the tape based on the result of the detection means at the start of tape loading. What is claimed is: 1. A magnetic recording and reproducing device comprising a control means.