JPS58215757A - High speed reproducer in vtr - Google Patents

Abstract

PURPOSE:To prevent noise band without affecting the running and to operate with a simple driving mechanism, by operating a shifted pole and a tilted post at a tape departure side of a head drum and a guide post at a tape approach side respectively at high speed reproduction. CONSTITUTION:A review slide 15 is pulled right, a tilted post 9c of a review post arm gives a required inclination to a tape 1, the shift pole 2 pushes up a lower ridge of a tape 1 upward to shift a tape running path, and the guide post 12c of a review guide arm 12 presses down the tape 1 downward slightly to give a suitable tension in the review mode. The tape 1 is wound on the tilted guide pole 5 with this tension, and wound on the head drum 4 and passes through the tilted guide pole 3 and is pushed upward with the pole 2. The height of running of the tape 1 is regulated to the same height as the normal reproduction so that the pushing-up does not exert effect on the running of the tape 1.

Description

DETAILED DESCRIPTION OF THE INVENTION In particular, the present invention relates to a noiseless high-speed playback device for a helical scan rotary head type VTR.

Modern VTRs (video tape recorders) are now capable of high-density recording on videotape, so the recording time for one cassette is long, which makes it easier to quickly find the location you want to watch or skip unnecessary locations. To make this possible, tapes with so-called high-speed playback devices have come into use, allowing fast-forwarding and rewinding while the tape is loaded into the head drum.

However, the conventional high-speed playback device for VT2't had the disadvantage that several noise bands were generated on both +i because the video head inevitably crossed the recording trace of the tape during high-speed playback.

Therefore, in order to prevent the video head from crossing the tape recording trace during high-speed playback, the applicant first switched to high-speed playback mode and changed the tape running angle of the head drum 2 to avoid the tape recording trace. We proposed a high-speed playback device configured to match the scanning trace of the video head.

However, the proposed high-speed playback device for a VTR has problems such as a complicated mechanism for changing the running angle of the tape on the head drum.

The present invention solves the above problem, and operates the shift ball and the inclined post on the tape exit side of the head drum and the guide post on the tape entry side during high-speed playback, so that the peripheral surface of the head drum and the shift ball are actuated. The tape running path is shifted only in the vicinity of the drive mechanism, and the shift ball, inclined post, and guide post are controlled to operate by the power of a common drive source, thereby achieving high-speed playback in a VTR with a simplified drive mechanism. The purpose is to provide equipment.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a plan view and a front view, respectively, of an embodiment of a high-speed playback device for a VTR according to the present invention, and FIGS. 3 and 17 are a longitudinal side view and a longitudinal sectional front view of the essential parts of Figures 7 through 7 are a front view of the part and a plan view at different heights for explaining the operation at the time of review, respectively, and Figure 7 is an exploded view of an embodiment of the shift ball shift mechanism shown in Figure 1. The perspective view and FIGS. 9 to 77 respectively show a front view of the main part and a plan view at different heights for explaining the operation during cueing.

In Figures 1 and 2, video tape (hereinafter simply referred to as tape)
)/ is being played back at normal running speed, that is, in a normal playback state, and the tape l that has passed through the impedance slow 2 enters the head drum re-circumference stage via the shift ball 2 and the inclined guide ball 3, and the tape l passes through the head drum q. After making about half a turn around the phase, the ball separates from the head-drum connection and is sent to the audio head 7 via the inclined guide ball j1 shift pole 6. The video head r rotates along the circumferential surface of the head drum, scans along the recording trace of the tape l, and performs normal reproduction.

Here, on the tape entry side of the head drum reel, a review post arm 9 and a cue guide arm 10 are rotatably supported on shafts 7a and 7a, respectively.
, / (forced counterclockwise in FIG. 1 by 7'b. There is an inclined post 9c at the tip of the review post arm 9, and a guide boss at the tip of the cue guide arm 10.) It is planted. On the other hand, on the tape release side of the head drum unit, a cue post arm // and a review guide arm /, 2 are rotatably supported on a common shaft //a, and springs //b and /2b are respectively supported. The force is energized clockwise in FIG. An inclined post//C is installed at the tip of the cubost arm l/, and a guide post l-/2c is installed at the tip of the review guide arm 2.

/3 and /ψ are granger solenoid mechanisms for review and cue, respectively, and are energized (operated) during review operation and cue operation, respectively.

Hereinafter, the operations during the review operation and the queue operation will be explained together with the operations shown in FIG. 3 and the following.

First, when switching to review mode by button operation, the solenoid /Ja of the review plunger solenoid mechanism 13
is energized and excited, and the plunger 1b is attracted. As a result, the review slide /j is pulled to the right in FIG. 6, j, via the review lever /Jc. This review slide 13 includes a review boss arm 9, a shift ball λ, a review guide arm/
This is for driving 2.

In the review post arm 9, the reversing lever 16 shown in FIG. 2 can be rotated counterclockwise in the figure by displacement of the locking part /ja of the review slide /S shown in FIG. At this time, the reversing slide /7 connected to the reversing lever 76 can be displaced in the opposite direction to the review slide IS, and as a result, the restriction on the stop lever (pin q(L) is released, so the force of the spring b causes the first It rotates counterclockwise in the figure, and the inclined post qC is brought into contact with the tape 1, as shown in FIG.

The shift ball 2 is connected to the guide roller l shown in j and 6.
When the slide is pushed up by the cam groove is b K of the review slide/3, the lower end is pushed up by the shift mechanism 79, which will be described later, and the upper end comes into contact with the lower end of the stopper screw 20 shown in Fig. The motor is stopped and the shift state is entered. As shown in FIG. 1, in the shift mechanism, a 22ft shift lever is built into the frame 2/ having a guide roller ig, and locking pieces 72a of the three shift levers are attached to the frame 2/.
A torsion spring is interposed between the 2J frame 2/ and the shift levers 2, 2 so as to be engaged with the shift levers 2, 2.

Therefore, when the guide roller /l is pushed up from below and the frame body 2/ rotates around the shaft 241, the shift lever also rotates following the frame body 2/, and its tongue piece 72b shifts. Push up the F end of ball 2 from below.

The review guide arm 12 is activated by the spring / when the restriction on the stopper pin / 2 d is released due to the displacement of the locking part /, ffc of the review slide / J shown in FIG.
, lb rotate clockwise in FIG. 1, and as shown in FIG. 7, the guide post) /2 c comes into contact with the tape l.

In this way, the review slide /↑ is pulled to the right in the figure by the j-th point, so that the inclined post 9C of the review post arm 9 gives a centered slope to the tape l, and the shift ball 2 moves the tape l. Push the lower edge upwards to shift the tape path, and then push the review guide arm/
, 2 guide posts/, 2C apply appropriate tension while slightly pressing the tape 1 in the F direction. Therefore, the tape l entering the helmet trim l from the side of the review guide arm 12 is tightly wrapped around the inclined guide ball j due to the tension generated by the guide post/2c, and then wrapped around the head drum and another one. It passes the inclined guide ball 3 and is pushed upward by the shift ball λ. Then, a tilted boss is provided so that the push-up by the shift ball 2 does not affect the subsequent running of the tape l.
c, the running height of the tape l is regulated to approximately the same height as during normal playback.

Next, when you switch to cue by operating the button, cue plunger solenoid mechanism/reno solenoid/41. a
is energized and excited, and the granger/4b is attracted. As a result, the cue slide 23 is pulled to the left in the q-th and to-diagrams via the cue lever /ll'c.

As explained below, this cue slide sword is for driving the cue top arm//, the shift pole 6, and the cue guide arm tof.

The cue post arm // is moved by the stopper pin i by the displacement of the locking portion ΔC of the cue slide J shown in FIG. 1O.
When the restriction on id is released, the force of the spring /lb rotates clockwise in Fig. 1, and the inclined boss (//c) comes into contact with the tape l as shown in Fig. 1/. Ru.

First, when the guide roller λ shown in FIG. 10 is pushed up by the cam groove Δb of the cue slide 8, the lower end of the shift ball 6 is pushed up by a shift mechanism 27 having the same configuration as the shift mechanism it described above. and shifts the traveling path of the tape L upward.

The cue guide arm 10 is moved by the stopper pin/by the displacement of the locking portion 23c of the cue slide Δ shown in FIG.
(When the restriction on 7d is released, the guide post 10c rotates counterclockwise in FIG. 1 due to the force of the spring 10b, and the guide post 10c comes into contact with the tape l as shown in FIG. ii.

In this way, by pulling the cue slide 23 to the left in FIGS. 9 and 70, the cue post arm //
The inclined boss llc of the cue guide arm 10 gives the necessary inclination to the tape l, and the shift ball ≦ pushes up the lower edge of the tape l with upward pressure to shift the tape running path, and the guide post 10c of the cue guide arm 10 tf Apply appropriate tension while pressing slightly downward. Therefore, the tape l entering the head drum reel from the side of the cue guide arm 10 is tightly wrapped around the inclined guide pole 3 due to the tension generated by the guide post IOC, and then wraps around the head drum reel and passes another inclined guide ball j. It is pushed upward by shift pole B.

Then, in order to prevent the pushing up by the shift pole B from affecting the subsequent running of the tape L, the running height of the tape L is regulated to the same height during 11n and main playback by the inclined boss)//Q.

As explained above, the high-speed playback device for a VTR according to the present invention operates the shift ball and the inclined post on the tape exit side of the head drum, and the guide post on the tape entry side during high-speed playback, thereby operating the head drum. Since the tape running path is shifted only near the peripheral surface and the shift ball, even if the running angle of the tape changes due to high-speed playback, the running of the tape as a whole will not be adversely affected. In addition, since the shift ball, tilt post, and guide post are controlled to operate using the power of a common drive source, these members can be operated accurately with a simple drive mechanism, which is an excellent effect. .

[Brief explanation of the drawing]

1st. Figure J is a plan view and a front view of an embodiment of the high-speed playback device in a VTRK according to the present invention, and the third and wide views are the first and third views, respectively.
Longitudinal side and front views of the main parts of the figure, Figures S to 7
The figures are a front view of main parts and a plan view at different heights for explaining the operation at the time of review, and the second figure is an exploded perspective view of an embodiment of the shift ball shift mechanism shown in FIG. 9 to ii are a front view of the main part and a plan view at different heights, respectively, for explaining the operation during cueing. l...video tape, 2,6...shift ball, r...head drum, 9c, //c...slanted post,
I.Q.C. /2c...Guide post, /,? , ia... Granger medium solenoid mechanism, 13... Review slide, lte, 27... Shift mechanism, 8... Cue slide. Figure 1, 13. 11c Figure 3

Claims (1)

[Claims] A tape running around a head drum is played back by a video head that rotates along the circumference of the head drum, and during high-speed playback, the running angle of the tape on the head drum is changed. In a high-speed playback device for a VTR, which is different from normal playback and matches the scanning trace of the video head, which is the recording trace of the tape, to perform high-speed playback without noise, the tape entry side and tape exit side of the head drum are used. A pair of shift balls are provided on each side, and the one on the tape release side is activated during high-speed playback to shift the tape running path in the width direction of the tape. During high-speed playback, the tape is brought into contact with the tape during high-speed playback, and the running path of the tape shifted by the operation of the shift ball is normal during playback, except for the circumferential surface of the head drum and the vicinity of the shift ball. A guide post and a tilted post that are regulated on the tape entry side and tape exit side, respectively, so as to remain unchanged from time to time, a shift ball to which the tilted post and the guidepost correspond, and a control means that is controlled to be operated by the power of a common drive source. A high-speed playback device for a VTR consisting of