JPH0319077Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a video tape loading device for a VTR, and more particularly to unloading a video tape so that it is completely stored in a video cassette.

(Prior Art) Video tape loading in a conventional VTR video tape loading device is as shown in FIG. In FIG. 1, 1 is a video cassette, 2 and 3 are supply and take-up reel stands, 4 is a head drum, 5 is a loading post attached to a loading arm (not shown), 6 is a video tape, and 7 is a tape guide. , 8 is a capstan, 9 is a pinch roller, 10 is a magnetic head, and 11 is an impedance roller. 1st
The figure shows a completed loading state in which a video cassette 1 is loaded on the reel stand, a video tape 6 is pulled out from the video cassette 1 toward the head drum 4 by the loading post 5, and is set on the head drum 4. In the figure, a broken line indicates the loading post 5 during unloading, and a broken line arrow indicates the moving direction of the loading post 5. By the way, when unloading from such a loading state, in the prior art, the video tape 6 is also wound by simultaneously driving the supply reel stand 2 in the direction opposite to the arrow in the figure. In this case, the reel idler of the reel stand driving device is interposed between the supply reel stand 2 and the reel motor that drives it, but the reel idler slips due to dust and oil and the video tape 6 is not sufficiently wound. Therefore, the videotape 6
Unloading may be considered complete even though the video cassette 1 is still outside the video cassette 1. Video cassette 1 is loaded with unloading completed like this.
Ejecting or loading the videotape may damage it.

A specific example of a conventional technique for winding a videotape onto a supply reel stand in the unloading operation is disclosed in Japanese Patent Application Laid-Open No. 56-111157.
There is something described in the publication.

In the prior art disclosed in this publication, felt is provided between the sub-reel stand disk and the main reel stand disk, but during unloading,
If the coefficient of friction of this felt is greatly reduced by organic gas or oil, the felt will slip and the video tape will not be able to be wound onto the supply reel stand, resulting in a slack state in the middle.

In the conventional method described in this publication, the video tape is not wound onto the supply reel stand after unloading is completed, so the video cassette cannot be jigged or loaded while there is slack in the video tape after unloading. There was a risk that the videotape would be damaged.

(Purpose) The present invention differs from the conventional method in which the videotape winding operation by the supply reel stand is stopped after unloading is completed. To prevent a video tape from being damaged when ejecting or loading a video cassette by ensuring that it is wound up securely and sufficiently without slack in a video cassette.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. This example is a VHS type VTR.
(video tape recorder).
Further, the videotape loading device of this embodiment has a first
The structure of the figure is the same as before. FIG. 2 is a diagram showing the configuration of this embodiment. This embodiment includes a switch means 12 for detecting the completion of unloading based on the position of the loading post 5.
This switching means 12 is connected to a loading motor 13.
It has a movable contact 121 and individual contacts 122 and 123 that move according to the moving position of the loading post 5 driven by the motor. This switch means 1
2 forms a loading completion signal S1 when the movable contact 121 is located at the first individual contact 122, and forms an unloading completion signal S2 when the movable contact 121 is located at the second individual contact 123.
The control device 14 connects an eject lever 15 to a worm gear 1 for ejecting the video cassette 1.
A first drive signal S3 is sent to the eject motor 18 that is driven via the gear 16 and the gear 17, a second drive signal S4 is sent to the circuit 20 that drives and controls the reel motor 19, and a third drive signal is sent to the loading motor 13. S5, respectively.
21 is a reel idler, and a reel motor 19
and the drive control circuit 20 as well as the reel stand drive device 2
2. When unloading is completed, this control device 14 sends a second drive signal S4 to the reel stand drive device 22 (in this case, the signal is a signal S4' for driving the reel stand, and in particular, this signal S4' is referred to as a drive signal S4'. ) and drives it, and also forms and outputs a set signal S6 in response to the unloading completion signal S2 from the switch means 12, and outputs a second drive signal S4 (in response to the input of the count-up signal S7). The signal at this point is a signal S4'' for stopping the drive of the reel stand, and in particular, this signal S4'' is formed and output as a drive stop signal S4''. The output means 23 includes, for example, a plurality of light detection holes 24 formed in the take-up reel stand 3 according to the rotation speed of the take-up reel stand 3.
24. ．． ．． a photocoupler 25 that detects the
, a counter 27, and a flip-flop 28. In this output means 23, a counter 27
counts the number of output pulses from the waveform shaping circuit 26, and outputs a reset signal S8 to the flip-flop 28 when the count reaches a predetermined value. Flip-flop 28 is reset by this reset signal S8 and provides a count-up signal S7 to controller 14. Therefore, according to this embodiment, when the video tape 6 is unloaded from the loading position, the loading post 5 is housed in the video cassette 1 by the loading motor 13, and the supply reel stand 2 is also moved to the reel stand. The video tape is wound by being driven by the drive device 22. Then, when the movable contact 121 of the switch means 12 is switched from the individual contact 122 to the individual contact 123, the unloading completion signal S2 is given from the switch means 12 to the control device 14. The control device 14 applies a drive signal S4' to the reel stand driving device 22 to gradually rotate the reel motor 19 to drive the supply reel stand 2, and flip-flops the set signal S6 in response to the unloading completion signal S2. Give to 28. The output means 23 uses a waveform shaping circuit 26 to shape the rotational speed detection signal from the photocoupler 25, and then causes the counter 27 to start counting. When the count value of this counter 27 reaches a predetermined value, the flip-flop 28 receives a reset signal S8 from the counter 27.
It is reset by The flip-flop 28 thereby sends the count-up signal S7 to the control device 1.
Give to 4. The control device 14 uses this count-up signal S7 to control the circuit 20 of the reel stand driving device 22.
A drive stop signal S4'' is output. Therefore, even after the unloading completion signal S2 is given to the control device 14, the video tape 6 is wound up by the rotation of the supply reel stand 2 until the counter 27 counts up. Even if the reel idler 21 slips, there is no fear that the video tape 6 will be ejected or loaded again while remaining outside the video cassette 1. Incidentally, a timer signal S9 is given from the control device 14 to the counter 27 of the output means 23, and this timer signal S9
When the rotation detection signal is not applied to the counter 27 from the waveform shaping circuit 26 even after a predetermined period of time has elapsed since the rotation detection signal is applied to the counter 27, the control device 14 stops the reel motor 19 and stops the loading operation and the ejection of the video cassette 1. Operate in such a way that the operation is prohibited.

(Effects) As is clear from the above explanation, according to the present invention, the loading post, the switching means,
It has a control device, a reel stand drive device, and an output means, and when unloading, the video tape is moved to the video cassette side by the loading post, and the switching means indicates the completion of unloading of the video tape by the loading post. The control device outputs a drive signal to the reel stand drive device and a set signal to the output means in response to the unloading completion signal. The drive device drives the supply reel stand in response to the drive signal to wind the video tape outside the video cassette onto the supply reel stand, and the output means starts winding after receiving the set signal. When the number of revolutions of the take-up reel stand reaches a predetermined value, a count-up signal is output to the control device, and the control device also outputs a drive stop signal to the reel stand drive device in response to the count-up signal. The stand driving device is also configured to stop the drive of the supply reel stand in response to the drive stop signal, thereby stopping the videotape winding operation by the supply reel stand.
Even if the video tape is stored in the video cassette by the loading post and loading is completed, the supply reel base is further rotated until the take-up reel base rotates a predetermined amount from the completed state. Since the video tape is further wound on the supply reel stand, the video tape can be stored in the video cassette without slack, and as a result, the video tape can be ejected or reloaded without damaging the video tape. be able to.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a videotape loading device for a VTR, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. 1... Video cassette, 2... Supply reel stand,
3...Take-up reel stand, 4...Head drum,
5... Loading post, 6... Video tape, 12... Switch means, 13... Loading motor, 14... Control device, 19... Reel motor, 20... Drive control circuit, 21... Reel idler , 22... Reel stand driving device, 23... Output means, 25... Photo coupler, 26... Waveform shaping circuit, 27... Counter, 28... Flip-flop, S1... Loading completion signal, S2...
...Unloading completion signal, S3...First drive signal, S4...Second drive signal, S5...Third drive signal, S6...Set signal, S7...Count up signal, S8...Reset signal, S9 ...Timer signal.

Claims (1)

[Claims for Utility Model Registration] It has a loading post 5, a switch means 12, a control device 14, a reel stand driving device 22, and an output means 23, and the loading post 5 is driven by a loading motor 13. The video tape 6 in the video cassette 1 loaded on each of the supply reel stand 2 and take-up reel stand 3 is
is pulled out to the head drum 4 at the time of loading and set in the head drum 4, while
During unloading, it moves toward the video cassette 1, and the switch means 12 detects the completion of unloading based on the position of the loading post 5 and outputs an unloading completion signal S2, and the control device 14 Unloading completion signal S
2, the reel stand drive device 22 outputs a drive signal S4', and the output means 23 outputs a set signal S6. The reel stand 2 is driven to wind the video tape 6 outside the video cassette 1 onto the supply reel stand 2 side, and the output means 23 is configured to drive the take-up reel stand 3 after receiving the set signal S6. When the number of rotations reaches a predetermined value, a count-up signal S7 is sent to the control device 1.
The control device 14 also outputs a count up signal S7.
The drive stop signal S4'' is output to the reel stand driving device 22 in response to the drive stop signal S4'', and the reel stand driving device 22 also outputs the drive stop signal S4''.
4'', the drive of the supply reel stand 2 is stopped, and the winding operation of the video tape 6 by the supply reel stand 2 is stopped.