JPS589501B2 - Jikiroku Onsai Seisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device using magnetic tape,
The object of this invention is to accurately detect the start and end of a signal recorded on a magnetic tape, and to make it extremely effective when cutting and editing the magnetic tape.

Generally, when editing a magnetic tape, the magnetic tape must be accurately cut and spliced at the beginning and end of the signals recorded thereon.

Traditionally, when detecting the start and end of a signal recorded on a magnetic tape, the reels on the supply and take-up sides are manually operated to slide the magnetic tape against the playback head and detect the output from the playback head. By monitoring, the start and end of the signal is detected.

However, in this case, when the start and end of the signal recorded on the magnetic tape are detected, the positions of the start and end of the signal are above the gap of the playback head, so if you try to cut the magnetic tape with a knife or the like at this position, The reproducing head is also generally provided with a head force bar, which is extremely difficult to cut.

Even if it were possible to cut it, a knife or the like could damage the gap portion of the reproducing head, which was extremely inconvenient and required great care.

Another option is to mark the beginning and end of the signal with a pencil or other tool and cut the magnetic tape away from the playback head, but magnetic tape is generally made of synthetic resin and has an extremely smooth surface. Because it is formed in
There was no suitable writing instrument that could easily mark this, and in any case, it was extremely difficult to cut the magnetic tape accurately at the beginning and end of the signal.

The present invention eliminates the above-mentioned conventional drawbacks, and after detecting the start and end of a signal recorded on a magnetic tape, the magnetic tape is accurately run a predetermined distance and marked or cut at that position. It is configured so that it can be done.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic recording and reproducing apparatus of the present invention will be described below with reference to drawings of embodiments.

1 and 2 are a front view and a sectional side view of the main parts of an embodiment of the magnetic recording and reproducing apparatus of the present invention, in which 1 is a mounting board for a chassis, cabinet, etc., and 2 is a mounting board for this. A shaft 3 fixed to the mounting board 1 and consisting of a large diameter portion 2a, a medium diameter portion 2b, and a small diameter portion 2c is rotatably fitted to the medium diameter portion 2b of the shaft 2, and has a recess 3a in the center of the upper end surface. A rotary body 4 for guiding the tape, a washer 4 fitted to the small diameter portion 2c of the shaft 2 to prevent the roller 3 from moving in the axial direction, and 5 rotatably fitted to the small diameter portion 2c of the shaft 2 and always supported by a spring 6. A rotating body biased upward; 7 a locking device screwed onto the end surface of the small diameter portion 2c of the shaft 2; 8 interposed between the lower surface of the head of the locking device 7 and the top surface of the rotating body 5; 9 is a magnetic tape guided and run by the rotating body 3, 10 is a playback head, 11 is a head cover, and 12 is a tape position setting member provided at a distance l from the playback head 10. be.

Incidentally, the rotating bodies 3 and 5 have marks 13, 14, and 15 on their upper surfaces, respectively, as shown in FIG.

In the above embodiment, when editing a magnetic tape, the magnetic tape 9 is brought into sliding contact with the playback head 10, and the output from the playback head 10 is monitored to detect the beginning and end of the signal recorded on the magnetic tape 9. do.

At the time when the start and end of the signal recorded on the magnetic tape 9 are detected, the positions of the start and end of the signal recorded on the magnetic tape 9 are at the gap position of the reproducing head 10.

In this state, the rotating body 5' is rotated by hand so that one of the marks 14 and 15 provided on the rotating body 5 coincides with the mark 13 provided on the rotating body 3.

Then, the magnetic tape 9 is slowly run in the direction of the arrow.

When the magnetic tape 9 is run in the direction of the arrow, the rotating body 3 rotates in the direction of the arrow.

Suppose now that the magnetic tape 9 is run in the direction of the arrow until the mark 13 attached to the rotating body 3 matches the remaining one of the marks 14 and 15 attached to the rotating body 5. If the diameter is D, then the vehicle has traveled by πD×θ/360 (θ is the angle occupied by the line connecting the centers of the rotating bodies 3 and 5 and the marks 14 and 15).

Therefore, if we attach the marks 14 and 15 so that θ is 180 degrees and install the tape position setting member 12 so that the distance l between the playback head 10 and the tape position setting member 12 is πD, then When the magnetic tape 9 is run in the direction of the arrow until the 30 mark 13 matches the remaining marks on the rotating body 5, the starting end of the signal recorded on the magnetic tape 9,
The end position will be at the position of the tape position setting member 12.

Therefore, if the magnetic tape 9 is pressed against the tape position setting member 12 in this state, the magnetic tape 9 will be bent at a position facing the tape position setting member 12, and the start and end of the signal recorded on the magnetic tape 9 will be accurately displayed. It turns out.

In this way, according to the above embodiment, the start and end of the signal recorded on the magnetic tape 9 can be accurately displayed, and the magnetic tape can be easily edited by cutting it at these positions and using it. can.

In the embodiment, the tape position setting member is used to mark the start and end of a signal on the magnetic tape. It may be configured.

Further, in the embodiment, two marks are attached to the rotating body that is operated by hand, but the number of marks does not necessarily have to be two, and may be one or three or more.

As is clear from the above embodiments, the present invention comprises a rotating body for guiding a magnetic tape that rotates as the magnetic tape runs, and a second rotating body that is operated by hand and is placed opposite to this rotating body. It is pivotally mounted on a rotating shaft mounted on a mounting board, and each of these rotating bodies has at least one mark, so that the traveling distance of the magnetic tape can be accurately detected based on these marks. Yes, when editing a magnetic tape, the start and end of the signal recorded on the magnetic tape are accurately detected by the output of the playback head, and the positions of the start and end are brought a predetermined distance away from the playback head.
Here, it is possible to mark or cut accurately at the above-mentioned positions, and editing of the magnetic tape can be done extremely accurately and easily.

According to the present invention, a hand-operated rotating body is provided at the distal end side of the fixed shaft, and a friction member is interposed between the locking tool provided at the distal end of the fixed shaft and the rotating body, so that the rotation Because the body is pressed against the friction member, the rotating body that is operated by hand is in a so-called semi-fixed state, and prevents it from accidentally rotating in relation to the rotating body for guiding the magnetic tape. It is stable and can be constructed compactly.

[Brief explanation of drawings]

FIG. 1 is a front view of a main part of an embodiment of the magnetic recording and reproducing apparatus of the present invention, and FIG. 2 is a sectional side view of the main part. DESCRIPTION OF SYMBOLS 1...Mounting board, 2...Fixed shaft, 3...Rotating body for guiding magnetic tape, 4...Washer, 5...Rotating body, 6...Spring, 7...Tightening tool, 8...Friction member , 9... Magnetic tape, 10... Playback head, 11... Head force bar,
12... Tape position setting member, 13, 14, 15... Marker.

Claims (1)

[Claims] 1 A rotary body for guiding the magnetic tape that rotates as the magnetic tape runs and a rotary body that is operated by hand, which is provided separately, are pivotally mounted on a fixed shaft attached to the mounting board, and a small A friction member is interposed between the hand-operated rotating body and a locking tool attached to the tip of the fixed shaft, and the rotating body is connected to the friction member. A magnetic recording and reproducing device biased toward the locking tool through the magnetic recording and reproducing device.