JPS6120065B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-speed playback device for a VTR,
In particular, it relates to a noiseless high-speed playback device for a helical scan rotary head type VTR.

Recent VTRs (video tape recorders) have become capable of high-density recording on videotape, so the recording time for one cassette is long, making it easier to quickly find the location you want to watch or skip over unnecessary locations. To make this possible, head drums equipped with so-called high-speed playback devices, which allow fast-forwarding and rewinding of tapes while they are loaded, have come to be used.

However, conventional high-speed playback devices for VTRs had the disadvantage that several noise bands appeared on the screen because the video head inevitably crossed the recording trace on the tape during high-speed playback.

Therefore, the applicant first switched to high-speed playback mode and changed the running angle of the tape on the head drum so that the video head would not cross the tape recording trace during high-speed playback. We proposed a high-speed playback device configured to match the scanning trace of the head.

However, the proposed high-speed playback device for VTRs had 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 a shift pole and an inclined post on the tape exit side of the head drum and a guide post on the tape entry side during high-speed playback, and operates the peripheral surface of the head drum and the vicinity of the shift pole. The drive mechanism is simplified by controlling the tape running path to be shifted only when the shift pole, tilt post, and guide post are operated by the power of a common drive source.
The purpose is to provide a high-speed playback device for VTR.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 are VTRs according to the present invention, respectively.
Figures 3 and 4 are a vertical side view and front view of the main parts of Figure 1, and Figures 5 to 7 illustrate the operation during review, respectively. FIG. 8 is an exploded perspective view of one embodiment of the shift mechanism of the shift pole shown in FIG. 4, and FIGS. A front view of a main part and a plan view at different heights are shown for explaining the operation of time.

In Figures 1 and 2, a video tape (hereinafter simply referred to as tape) 1 is being played back at a normal running speed, that is, in a normal playback state, and the tape 1, which has passed through an impedance roller, moves through a shift pole 2 and an inclined guide pole 3. enters the peripheral surface of the head drum 4 through the
After making about half a turn around the circumferential surface of the head drum 4, it is separated from the head drum 4 and sent to the audio head 7 via an inclined guide pole 5 and a shift pole 6. The video head 8 rotates along the circumference of the head drum 4 and scans along the recording trace of the tape 1.
Normal playback occurs.

Here, on the tape entry side of the head drum 4,
Review Post Arm 9 and Kyu Guide Arm 1
0 are rotatably supported on shafts 9a and 10a, respectively, and biased counterclockwise in FIG. 1 by springs 9b and 10b, respectively. Review post arm 9
An inclined post 9c is installed at the tip of the guide arm 10, and a guide post 10c is installed at the tip of the cue guide arm 10. On the other hand, on the tape release side of the head drum 4, a queue post arm 11 and a review guide arm 12 are rotatably supported on a common shaft 11a, and are rotated clockwise in FIG. 1 by springs 11b and 12b, respectively. It's backed up. An inclined post 11c is installed at the tip of the queue post arm 11, and a guide post 12c is installed at the tip of the review guide arm 12.

Numerals 13 and 14 are plunger solenoid mechanisms for review and cue, respectively, which are energized and activated during review and cue operations, 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 you switch to review by pressing the button,
The solenoid 13a of the review plunger solenoid mechanism 13 is energized and excited, and the plunger 13
b is attracted. As a result, review lever 13
c, the review slide 15 is pulled to the right in FIGS. 5 and 6. This review slide 15
As explained below, the review post arm 9, shift pole 2, review guide arm 12
It is for driving.

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 15a of the review slide 15 shown in FIG. As a result, the reversing slide 17 connected to the reversing lever 16 can be displaced in the opposite direction to the review slide 15.
Since the restriction on the stopper pin 9d is released, it is rotated counterclockwise in FIG. 1 by the force of the spring 9b, and the inclined post 9c is brought into contact with the tape 1 as shown in FIG.

In the shift pawl 2, the guide roller 18 shown in FIGS.
When pushed up by b, the lower end is pushed up by a shift mechanism 19, which will be described later, and the upper end abuts and locks on the lower end of the stopper screw 20 shown in FIG. 4, resulting in a shift state. . Shift mechanism 1
9 incorporates a shift lever 22 into a frame 21 having a guide roller 18, as shown in FIG.
A torsion spring 23 is interposed between the frame 21 and the shift lever 22 so that the locking piece 22a of the shift lever 22 is locked to the frame 21. Therefore, when the guide roller 18 is pushed up from below and the frame body 21 rotates around the shaft 24, the shift lever 22 also rotates following the frame body 21, and the tongue piece 22b of the shift lever 22 rotates around the shaft 24. Push up the bottom end from below.

When the restriction on the stopper pin 12d is released by the displacement of the locking portion 15c of the review slide 15 shown in FIG. 6, the review guide arm 12 is rotated clockwise in FIG. 1 by the force of the spring 12b. Then, as shown in FIG. 7, the guide post 12c comes into contact with the tape 1.

In this way, review slide 15 is the fifth and sixth slide.
By being pulled to the right in the figure, the inclined post 9c of the review post arm 9 gives the tape 1 the necessary inclination, and the shift pole 2 pushes the lower edge of the tape 1 upward to shift the running path of the tape. Furthermore, the guide post 12c of the review guide arm 12 slightly presses the tape 1 downward and provides appropriate tension. Therefore, the tape 1 entering the head drum 4 from the side of the review guide arm 12 is tightly wound around the inclined guide pole 5 by the tension generated by the guide post 12c, and then wrapped around the head drum 4 and then wrapped around the other inclined guide pole 3. Shift pole 2 past
is pushed upward by. Then, in order to prevent the pushing up by the shift pole 2 from affecting the subsequent running of the tape 1, the running height of the tape 1 is regulated by the inclined post 9c to approximately the same height as during normal reproduction.

Next, when switching to the cue mode by operating a button, the solenoid 14a of the cue plunger solenoid mechanism 14 is normally energized, and the plunger 14b is attracted. As a result, the cue slide 25 is pulled to the left in FIGS. 9 and 10 via the cue lever 14c. This cue slide 25 is for driving the cue post arm 11, the shift pole 6, and the cue guide arm 10, as will be explained below.

When the restriction on the stopper pin 11d is released by the displacement of the locking portion 25c of the cue slide 25 shown in FIG. 10, the cue post arm 11 is moved clockwise in FIG. 1 by the force of the spring 11b. As shown in FIG. 11, the inclined post 1
1c is brought into contact with the tape 1.

In the shift pawl 6, the guide roller 26 shown in FIGS.
When pushed up by the tape 1, the lower end is pushed up by a shift mechanism 27 having the same configuration as the shift mechanism 19 described above, and the running path of the tape 1 is shifted upward.

The cue guide arm 10 is moved counterclockwise in FIG. 1 by the force of the spring 10b when the restriction on the stopper pin 10d is released by the displacement of the locking portion 25c of the cue slide 25 shown in FIG. The shift post 10c rotates, and the shift post 10c comes into contact with the tape 1, as shown in FIG.

In this way, the queue slide 25 is
By being pulled to the left in the figure, the inclined post 11c of the cue post arm 11 gives the tape 1 the necessary inclination, and the shift pole 6 pushes the lower edge of the tape 1 upward to change the running path of the tape. Furthermore, the guide post 10c of the cue guide arm 10 presses the tape 1 downward slightly and provides appropriate tension. Therefore, the tape 1 entering the head drum 4 from the side of the cue guide arm 10 is tightly wound around the inclined guide pole 3 by the tension generated by the guide post 10c, and then wrapped around the head drum 4 and then wrapped around the other inclined guide pole. 5 and is pushed upward by the shift pole 6. Then, in order to prevent the pushing up by the shift pole 6 from affecting the subsequent running of the tape 1, the running height of the tape 1 is regulated by the inclined post 11c to approximately the same height as during normal reproduction.

As explained above, the high-speed playback device for a VTR according to the present invention moves the shift pole and inclined post on the tape exit side of the head drum during high-speed playback.
In addition, shift posts are activated on the tape entry side so that the tape running path is shifted only around the circumference of the head drum and near the shift pole, so the tape running angle changes with high-speed playback. However, this does not adversely affect the running of the entire tape, and since the shift pole, tilt post, and guide post are controlled to operate by the power of a common drive source, these members can be driven by a simple drive mechanism. It has excellent effects such as being able to operate accurately.

[Brief explanation of the drawing]

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, FIGS. 3 and 4 are a longitudinal side view and a longitudinal sectional front view of the main parts of FIG. Figures 7 to 7 are front views of main parts and plan views at different heights for explaining the operation during review, respectively, and Figure 8 is an exploded view of one embodiment of the shift mechanism of the shift pole shown in Figure 4. Perspective view,
9 to 11 are a front view of a main part and a plan view at different heights for explaining the operation during queueing. 1...Video tape, 2,6...Shift pole, 4
...Head drum, 9c, 11c...Slanted post, 1
0c, 12c... Guide post, 13, 14... Plunger solenoid mechanism, 15... Review slide, 19, 27... Shift mechanism, 25... Queue slide.

Claims (1)

[Claims] 1 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,
In a high-speed playback device for a VTR, the running angle of the tape on the head drum is made different from that during normal playback, so that the recording traces of the tape match the scanning traces of the video head, and high-speed playback without noise can be performed. A pair of shift poles are provided on the tape entry side and tape ejection side of the head drum, and the one on the tape ejection side is activated during high-speed playback to shift the tape running path in the width direction of the tape, and each of the shift poles. are set up in response to each
During normal playback, it is separated from the tape, and during high-speed playback, it is brought into contact with the tape, and the running path of the tape shifted by the operation of the shift pole is normally A guide post and a tilted post are regulated on the tape entry side and tape exit side so as to be the same as during playback, and a control means is configured to control the tilted post and the guide post so that they are operated by the power of a common drive source with the corresponding shift pole. High-speed playback device for VTR.