JPS588063B2 - 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 the magnetic tape should be cut at this position using a knife, etc. However, the reproducing head is generally provided with a head cover, 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.

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 a mark is placed at that position. It is constructed so that it can be cut.

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 reproduction device of the present invention, in which 1 is a mounting board for a chassis, cabinet, etc., and 2 is this mounting board. A shaft 3 is fixedly fixed to the shaft 1 and has a large diameter portion 2a, a medium diameter portion 2b, and a small diameter portion 2c, and a tape guide 3 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 rotating body 4 is fitted to the small diameter portion 2c of the shaft 2 and prevents the roller 3 from moving in the axial direction; 5 is rotatably fitted to the small diameter portion 2c of the shaft 2 and is always pushed upward by a spring 6. 7 is a fastener threaded onto the end face of the small diameter portion 2c of the shaft 2, and 8 is interposed between the lower surface of the head of the fastener 7 and the upper surface of the rotor 5. A friction member 9 is a magnetic tape guided and run by the rotating body 3, 10 is a reproducing head, 11 is a head cover, and 12 is a tape position setting member provided at a distance I from the reproducing head 10.

Note that the rotating bodies 3 and 5 have marks 13, 14, and 15 on their upper surfaces, respectively, as shown in FIG.
By slidingly contacting the reproducing head 10 and monitoring the output from the reproducing head 10, the start and end of the signal recorded on the magnetic tape 9 is detected.

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 manually operated so that one of the marks 1415 provided on the rotating body 5 becomes the mark 1 provided on the rotating body 3.
Rotate it to match 3.

After that, 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.

Now, if 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, the magnetic tape 9 If the diameter is D, then the vehicle has traveled by πD×θ/360 (θ is the angle occupied by the line connecting the center of the rotating bodies 3 and 5 and the landmark 14.15).

Therefore, suppose now that the marks 14 and 15 are attached so that θ is 180°, and the tape position setting member 12 is installed so that the distance 1 between the playback head 10 and the tape position setting member 12 is 1/2πD. When the magnetic tape 9 is run in the direction of the arrow until the mark 13 on the rotating body 3 matches the remaining marks on the rotating body 5, the starting and ending positions of the signals recorded on the magnetic tape 9 are determined by the tape position setting member 12. It will come to the position of

Therefore, in this state, if the magnetic tape 9 located at the tape position setting member 12 is pressed toward the tape position setting member 12, the magnetic tape 9 will be bent at a position facing the tape position setting member 12, and the magnetic tape 9 will be bent. This will accurately display the beginning and end of the recorded signal.

If the distance l between the playback head 10 and the tape position setting member 12 is set to 1/2πD+α, it is possible to accurately display the position α away from the start and end of the signal on the magnetic tape 9. become able to.

As described above, according to the above embodiment, it is possible to accurately display the starting edge, the ending edge, or a position a certain distance away from the starting edge or ending edge of the signal recorded on the magnetic tape 9, and the magnetic tape 9 can be cut and used at this position. This makes it easier to edit magnetic tapes.

FIG. 3 is a sectional side view of main parts of another embodiment of the magnetic recording and reproducing device of the present invention, in which 16 is a mounting board, 17 is a hollow fixed shaft mounted on the mounting board 16, and 18 is a fixed a dish-shaped rotary plate rotatably fitted to the shaft 17; 19 a washer attached to the tip of the fixed shaft 17; 20 a spring interposed between the washer 19 and the rotary plate 18;
Reference numeral 21 denotes a rotating body for guiding a magnetic tape, in which a rotating shaft 22 is inserted into the center hole of the fixed shaft 17 and is rotatably pivotally mounted.

As in the embodiment shown in FIGS. 1 and 2, marks are placed on the rotating bodies 18 and 21 at positions close to each other.

FIG. 4 is a cross-sectional side view of still another embodiment of the magnetic recording and reproducing apparatus of the present invention, in which reference numeral 22 denotes a mounting board, 23
24 is a fixed shaft attached to the mounting board 22, and 23 is a fixed shaft.
a rotating body for guiding a magnetic tape rotatably mounted on the 2
5 is rotatably fitted to the tip of the fixed shaft 23 and is connected to the rotating body 2
26 is a washer that is fitted onto the fixed shaft 23 to prevent the rotor 24 from moving in the axial direction; 27 is the rotor 25 and the washer 26; It is a spring interposed between.

Incidentally, marks are attached to the upper end surfaces of the rotating bodies 24 and 25 as in the previous embodiment.

In this embodiment, the rotating body 25 is mounted so as to cover the outer circumference of the upper end surface of the rotating body 24, so that the magnetic tape does not enter between the rotating bodies 24 and 25 when the magnetic tape is mounted. It has the effect of preventing damage.

In the embodiment, the tape position setting member is used to mark the start and end of a signal on the magnetic tape, but it is also possible to configure the tape position setting member with a cutting blade and directly cut the magnetic tape. It may be configured as follows.

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

Further, in the embodiment, a mark is placed directly on the rotary body for guiding the magnetic tape, but a separate rotary body that interlocks with the rotary body may be provided, and the mark may be placed on this rotary body.

As is clear from the embodiments described above, the present invention includes a first rotating body that rotates as the magnetic tape runs, and a second rotating body that is pivotably mounted opposite to this rotating body and is operated by hand. , each of these rotating bodies is equipped with at least one mark so that the traveling distance of the magnetic tape can be accurately detected based on these marks, and when editing the magnetic tape, it is possible to accurately detect the travel distance of the magnetic tape by the output of the playback head. The start and end points of the signal recorded on the magnetic tape are accurately detected, the start and end points are brought a predetermined distance away from the playback head, and then the above positions are accurately marked or cut. This makes it possible to edit magnetic tapes extremely accurately and easily.

[Brief explanation of the drawing]

FIG. 1 is a front view of a main part of an embodiment of the magnetic recording and reproducing apparatus of the present invention, FIG. 2 is a cross-sectional side view of the same main part, and FIGS.
The figure is a sectional side view of a main part of another embodiment. 1,16.22...Mounting board, 2,17.23...Fixed shaft, 3,21.24...Rotating body for magnetic tape guide, 4,
19.26... Watscher, 5, 18.25... Rotating body, 6, 20.27... Spring, 7... Fastener, 8...
...Friction member, 9...Magnetic tape, 10...Reproduction head,
11...Head cover, 12...Tape position setting member,
13, 14, 15...marks.

Claims (1)

[Claims] 1. It has a first rotating body that rotates according to the running of the magnetic tape, and a second rotating body that is pivotally mounted opposite to this rotating body, and each of these rotating bodies has at least one mark. A magnetic recording and reproducing device, characterized in that the second rotating body is configured to be rotated manually regardless of the running of the magnetic tape.