JPS588064B2 - 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 beginning and end of a signal recorded on a magnetic tape, and to make it extremely effective when cutting and editing a 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.

Conventionally, when detecting the start and end of a signal recorded on magnetic tape, the reels on the supply side and take-up side are manually operated to bring the magnetic tape into sliding contact with the playback head, and the output from the playback head is detected. By monitoring the signals, the start and end of the signal is detected.

However, in this case, at the time 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, and therefore, the magnetic tape is cut using a knife or the like at this position. Even if you try to cut it, the reproducing head is generally provided with a head cover, which makes it extremely difficult to cut.

Even if it were possible to cut it, it would be extremely inconvenient to use a knife or the like to damage the gap portion of the reproducing head, requiring great care when cutting.

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 and 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 and reproducing apparatus of the present invention, in which 1 is a mounting board for a chassis, cabinet, etc., and 2 is this mounting board 1. Large diameter portion 2a, medium diameter portion 2b, and small diameter portion 2c fixed to
A shaft 3 is rotatably fitted to the medium diameter portion 2b of the shaft 2 and has a concave portion 3a in the center of the upper end face. A rotor 4 is fitted to the small diameter portion 2c of the shaft 2 and is a roller. 3 is a washer for preventing movement in the axial direction; 5 is an outer diameter portion 2c of the shaft 2;
A rotating body that is rotatably fitted into the body and constantly urged upward by a spring 6.

7 is a fastener screwed onto the end face of the small diameter portion 2c of the shaft 2; 8 is a friction member interposed between the lower surface of the head of the fastener 7 and the upper surface of the rotating body 5; 9 is 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 l from the reproducing head 10.

Incidentally, as shown in FIG. 1, marks 13, 14, and 15 are attached to the upper surfaces of the rotating bodies 3 and 5, respectively.

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 check the start and end of the signal recorded on the magnetic tape 9. To detect.

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, by manually operating the rotating body 5, one of the marks 14 and 15 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.

The mark 13 now attached to the rotating body 3 is the mark 1 attached to the rotating body 5
4.15, if the magnetic tape 9 is run in the direction of the arrow, the magnetic tape 9 will be πD×θ/360 (where θ is the diameter of the rotating body 3, Angle occupied by the line connecting the center of 5 and landmarks 14 and 15)
This means that only the vehicle was allowed to run.

Therefore, now marks 14 and 15 are attached so that θ is 180 degrees, and the playback head 10 and tape position setting member 12 are
If the tape position setting member 12 is installed so that the distance l from the rotating body 3 is 1/2πD, the starting edge of the signal recorded on the magnetic tape 9 will be , the end position is determined by the tape position setting member 12.
It will come to the position of

Therefore, in this state, if the magnetic tape 9 at the position of 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.

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. FIG. 3 is a cross-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 shaft. A dish-shaped rotary plate having a recess 18a on the upper surface rotatably fitted to the shaft 17; 19 is the fixed shaft 1;
7 is a washer attached to the tip, 20 is a washer
a spring 21 interposed between 19 and the rotating plate 18;
is a rotating body for guiding a magnetic tape, in which a rotating shaft 22 is inserted into a center hole of a fixed shaft 17 and is rotatably pivotally mounted.

The rotating bodies 18, 21 are marked in close proximity to each other, as in the embodiment shown in FIGS. 1 and 2.

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.

Furthermore, 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.
It 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 manually operated rotating body that is pivotally mounted opposite to this rotating body. At least one mark is attached to each of these rotating bodies, and the traveling distance of the magnetic tape can be accurately detected based on these marks.When editing the magnetic tape, the playback head is The output accurately detects the start and end of the signal recorded on the magnetic tape,
The starting and ending positions are brought a predetermined distance away from the playback head, and from here the positions can be marked and cut accurately, making editing of the magnetic tape extremely accurate and easy. It is something that can be done.

According to the present invention, since one rotating body is housed in a recess formed in the other rotating body, the overall cost is not so high, and the structure can be made compact and easy. It is also extremely advantageous.

[Brief explanation of drawings]

FIG. 1 is a front view of a main part of one embodiment of a magnetic recording and reproducing apparatus of the present invention, FIG. 2 is a sectional side view of the same main part, and FIG. 3 is a sectional side view of a main part of another embodiment. 1, 16... Mounting board, 2, 17... Fixed shaft, 3, 21
... Rotating body for magnetic tape guide, 3a, 18a ... recessed part,
4,19...Watscher, 5,18...Rotating body, 6,2
0... Spring, 7... Fastener, 8... Friction member, 9
... Magnetic tape, 10 ... Playback head, 11 ... Head cover, 12 ... Tape position setting member, 13, 14, 1
5... Mark.

Claims (1)

[Claims] 1. A rotating body that rotates as the magnetic tape runs and a manually operated rotating body are rotatably mounted on the same axis, and one rotating body is inserted into a recess formed on the top surface of the other rotating body. , at least one on each of the mutually adjacent portions of both rotating bodies.
A magnetic recording and reproducing device with consecutive marks.