JPS6333225B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette holding mechanism for a fixed head video tape recorder.

In fixed head video tape recorders, the cassette must be separable because the tape roll is rolled into contact with the capstan, and the cassette holder that supports the cassette is designed to hold the capstan between the tape roll after separating the cassette. However, when recording or reproducing, the cassette must be stably supported within the cassette holder.

Therefore, the present invention is configured to stably hold a cassette in a cassette holder by locating the center of rotation of the tape roll further back than the center of rotation of the capstan when the tape roll is brought into contact with the capstan. The purpose of the present invention is to propose a new and effective cassette holding mechanism for a fixed head type video tape recorder.

An embodiment of the present invention will be described below with reference to the drawings.

First, let us first explain the structure of the cassette of this embodiment.
This will be explained according to the drawings and FIG. The cassette of this embodiment has a structure in which the cassette case can be divided into two parts so that the tape roll can be brought into contact with the capstan when the cassette is installed, and a lock structure so that the cassette case can be integrated when the cassette is removed. There is. That is, each of the cassette cases 10a and 10b rotatably inserts and supports the tape hubs 11a and 11b so that the openings face each other, and a plate-shaped guide band 12 and a U-shaped cross section are arranged along the side walls of the openings. With the guide rail 13 slidably arranged and the cassette cases 10a, 10b integrated, the sliding movement of the guide band 12 and guide rail 13 is locked by a locking means to be described later. Further, the magnetic tape T wound around the tape hubs 11a and 11b has its magnetic surface facing inside, and the magnetic tape T connecting the tape rolls is guided by at least a pair of guide posts 14a and 14b in the guide rail 13. It is stretched parallel to one side wall of the cassette case. Furthermore, the top plate and bottom plate of the cassette cases 10a and 10b are provided with first step portions 15a and 15b that allow the guide rail 13 to slide, and a second step portion 16a that allows for the penetration of a capstan, which will be described later.
16b is formed, and a through hole 17 for entering a take-up pulley for winding up excess tape is formed in the bottom plate at the bottom of one tape hub 2b, and
The opening sides of 5a and 15b serve to prevent the guide rail 13 from coming off. In addition, figure number 18a in Figure 1,
18b is a second guide post that guides the magnetic tape T when the tape is mounted; 19a and 19b are guide defining notches that define the positions of eccentric posts (to be described later) that guide the magnetic tape T toward a fixed position when the tape is mounted. manifest.

Further, as shown in FIG. 1, the locking mechanisms provided at the corners of the cassette cases 10a and 10b are symmetrical in shape, and as shown in FIG. A lock lever 21 is pivotably supported on a lock lever shaft 20 which is integrally molded as a part of the lever 22.
The protrusion 21a of the lock lever 21 is urged downward into the guide groove 23 formed on the lower surface of the bottom plate of the cassette case, and the lock pin 21b at the tip is pushed into the guide band 12 or the guide rail 13. Engagement notch 2 formed at the end
4 is engaged. Therefore, when the cassette is inserted into the cassette holder, the protrusion 21a is pushed up by the protrusion inside the cassette holder, and the engagement notch 24 and the lock pin 21b are disengaged, and when the cassette is removed, the spring is removed. 22 causes the protrusion 21a to protrude into the guide groove 23, and the lock pin 21b engages with the engagement notch 24 to be in a locked state.

The configuration of the apparatus of this embodiment will be explained below.
FIG. 3 shows a side view of the same device immediately after the cassette is inserted, FIG. 4 shows a plan view of the same, and FIG. 5 shows a sectional view of the same central side. First, the support mechanism of the cassette holder of this embodiment consists of a pair of pivot blocks 30 on the base.
A pair of support arms 3 pivotally supported on each of a and 30b
A pair of guide shafts 32, 3 between 1a and 31b
3 and a motor support bracket 34 are screwed and fixed, cassette holders 35a and 35b are supported on the guide shafts 32 and 33 so as to be slidable in the direction of separation, and the cassette holders 35a and 35b are supported on the motor support bracket 34 so as to be slidable in the direction of separation. Rack 36a of 35b,
Cassette separation motors 38a and 38b which engage pinions 37a and 37b are attached to cassette holders 36b, and coil springs 39 for traction are stretched over the cassette holders 35a and 35b. The cassette insertion positions of the cassette holders 35a and 35b are determined by projections 40 formed on the bracket 34.

Therefore, with respect to the cassette holders 35a, 35b defined by the protrusion 40, the guide grooves 23a, 23b of the cassette are aligned with the protrusions 41a, 4 of the holder.
1b and insert the cassette, the cassette is pressed downward by the leaf springs 42a and 42b and reaches the fully inserted position shown in FIGS. The cassette separation motors 38a and 38b are driven by the cassette complete insertion detection means.
By driving the motors 38a, 38b, the racks 36a, 36b are moved to the pinions 35a, 35b.
The cassette holders 35a, 35 are engaged with each other.
b separates from each other while holding the cassette cases 10a and 10b respectively, and abuts both ends 34a and 34b of the bracket 34, so that the cassette cases 10
The distance between a and 10b is made sufficiently larger than the diameter of the capstan. When the cassettes are separated, the support arms 31a and 31b are rotated against the bias of the opening spring 43, and at the end of their rotation, they are guided by positioning blocks 44a and 44b on the base, and the cassette holder is 35a and 35b are brought to the cassette mounting position. Note that the support arms 31a, 31
The rotation of b can be performed not only manually but also electrically, and the motor is driven by a switch means that closes when the cassette is separated and opens when the support arms 31a and 31b reach the end of rotation. Therefore, the support arms 31a, 31
It is sufficient if b is linked. As mentioned above, when the support arms 31a, 31b reach the end of rotation, the locking means attached inside one of the support arms 31b is locked to the base, and the cassette holders 35a, 35 are locked.
The cassette is locked in the cassette mounting position b. That is, the lock member 46, which is supported by the support members 45, 45, urges the hook portion 46a outward by the leaf spring 47, and the support arms 31a, 31b
When the end of rotation is reached, the hook portion 4 is attached to the bottom surface of the base.
6a is engaged.

When the support arms 31a, 31b reach the end of rotation and the cassette is attached, the eccentric posts 48,
48 enters the guide defining notches 19a, 19b of the guide rail 13 and guides the magnetic tape to the fixing pin 49, after which the tape roll rolls into contact with the capstan 52. That is, the support arm 3
When the loading motor 50 is driven by the rotation end detection means 1a and 31b, the support plate 51 that supports the eccentric post 48 and forms the rack portion 51a rotates as the pinion 51 of the loading motor 50 rotates. and then move the fixation side to the side, and engage the eccentric posts 48a and 48b with the guide regulation notches 19a and 19b,
The cassette separation motors 38a, 38b are released from the driving state by means (not shown) for detecting the completion of tape mounting, and the cassette holders 35a, 35a are pulled by the coil spring 39. 35b and attach the tape rolls in the cassette cases 1a and 1b to the capstan 5.
2 and drives the tape winding motor 56 to rotate the tape winding hub 11b and wind up the excess tape. In this embodiment, the center of the tape roll, that is, the center of rotation of the tape hubs 11a, 11b, is in a rotational relationship that is located further back than the center of the capstan 52, and urges the cassette cases 10a, 10b in the insertion direction. The feature is that this prevents the cassette from coming off.

When the record button or play button is pressed after entering the recording/playback preparation state in the above-mentioned order, the capstan motor 53 is driven in one direction to run the magnetic tape T, and at the same time, the tape is wound. A separating motor interlocked with the cassette holder on the receiving side is driven in reverse to move the tape roll to the capstan 52.
It makes the rolling contact stronger and applies stronger rotational force to the tape winding body on the winding side. When the video signal is recorded or reproduced in such a state and the magnetic tape T reaches the start or end of its run, the capstan motor 53 is reversed by the operation of an appropriate start/end detection means (not shown). At the same time, the reverse drive relationship of the separation motor is reversed to reverse the running of the magnetic tape T, while the pulse motor 55 for screwing the rotary shaft 55a into the support disk 54 supporting the fixed head 49 is moved in a predetermined direction. By rotating the fixed head 49 by a predetermined amount, the fixed head 49 is displaced by one track, thereby changing the recording track or reproduction track. The device of this embodiment repeats the above-mentioned operation every time it detects the beginning and end of running of the magnetic tape.
A configuration is adopted in which the magnetic tape T is scanned in the longitudinal direction a predetermined number of times. In addition, in FIGS. 4 to 6, the support disk 54
Guide poles 57, 57, with one end screwed onto the
57 is a guide for preventing rotation of the support disk 54 and shifting the fixed head 49 only up and down.

Furthermore, in the present embodiment, if the drive state of the capstan motor 53 and the separation motor 38a or 38b is released by pressing the stop button or the end of recording or playback, and then the eject button is pressed, the operation starts. After the loading motor 50 is driven in the reverse direction, the eccentric posts 48a and 48b are retracted, and the separating motors 38a and 38b are driven and the cassette holders 35a and 35b are separated, the locking member 46 is When the engagement is released and the opening spring 43 is biased, the support arm 3
1a and 31b are rotated to the cassette open position. The cassette holders 35a and 35b, which have reached the cassette open position and are separated, are moved by the separation motor 38.
a, 38b and the coil spring 39, and excess tape generated due to the proximity of the cassette case is moved to one tape hub 11b by the drive of the tape winding motor 56.
A take-up pulley (not shown) in contact with the lower surface rotates to take up the magnetic tape T.
With the cassette cases 10a, 1
The cassette can be removed by abutting the 0b. Thereafter, the cassette holders 35a, 35b
When the cassette is removed, the locking mechanism inside the cassette holder becomes locked and prevents the cassette from being separated.

As described above, according to the structure of the present invention, since the center of rotation of the tape roll is located further back than the center of rotation of the capstan, the cassette can be stably supported on the cassette holder, which is highly effective. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a cassette according to the present invention;
Fig. 2 is a perspective view of the main part of the cassette locking mechanism, Fig. 3 is a right side view of an apparatus according to an embodiment of the present invention in a state in which the cassette is inserted, Fig. 4 is a plan view thereof, and Fig. 5 is a sectional view from the center side. , FIG. 6 shows a plan view of the same device in a state where the tape is loaded. Explanation of main drawing numbers, 10a, 10b...cassette case, 39...coil spring, 3
5a, 35b...cassette holder, 54...capstan, 49...fixed head.

Claims (1)

[Scope of Claims] 1. Separable cassette holders 35a, 35b, which are drawn together by springs 39 and form storage areas for the separable cassette cases 10a, 10b, are attached in connection with the insertion of the cassette cases 10a, 10b. The cassette case 10 is moved apart against the bias of the spring 39, and is attached to the capstan 52 located between the cassette cases 10a and 10b in conjunction with the installation of the cassette holders 35a and 35b.
The pair of tape rolls in a and 10b are brought into contact with each other by at least the biasing force of the spring 39, and the tape loop connecting the two tape rolls is brought into contact with the fixed head 49, which is related to the recording or reproducing operation. In a fixed head type video tape recorder in which the capstan 52 is driven by a fixed head type video tape recorder, when the pair of tape rolls are brought into contact with the capstan, a line connecting the centers of the pair of tape rolls is from the center of the capstan 52. A cassette holding mechanism for a fixed head type video tape recorder, characterized in that the capstan 52 is disposed at the back of the cassette holders 35a, 35b.