JPH02287948A - Video tape recorder - Google Patents

Abstract

PURPOSE:To easily select an FF/REW mode or a high-speed FF/REW mode by providing an intermediate gear which couples between a gear on a driving side and a relay gear on a supplying side or a relay gear on a taking-up side. CONSTITUTION:Change-over switches 30 and 34 which switch a first gear row consisting of the gear 23 on the driving side, a pendulum gear 44 and the relay gear 47 on the taking-up side or the relay gear 46 on the supplying side and a second gear row consisting of the gear 23 on the driving side, the intermediate gear 40 and the relay gear 47 on the taking-up side or the gear 46 on the supplying side are provided. Then, the speed reduction ratio of the second gear row is set lower than that of the first gear row and a reel base 4 on the taking-up side or a reel base 3 on the supplying side is rotated by the first gear row under the state that a tape is loaded at the time of the FF/REW mode. Besides, the reel base 4 or the reel base 3 is rotated by the second gear row under the state that the tape is returned in an unloading direction at the time of the high-speed FF/REW mode.

Description

DETAILED DESCRIPTION OF THE INVENTION The video tape recorder of the present invention will be explained according to the following items.

A. Industrial field of application B1 Overview of the invention C1 Prior art [Fig. 6 1 D1 Problem to be solved by the invention E0 Means for solving the problem F. Examples [Figs. 1 to 5] a. Video tape recorder [Fig. 1] b. Drive system [Fig. 1 to 5] C1 switching means [Fig. 2 to 5] d. Operation [Fig. 5] e4 Shaking prevention means [Fig. 2] ] 11 Actions f-1, play mode, reverse play mode [Figure 5 (C)] f-2, FF/REW mode [Figure 5 (B)] f-3, high speed REW mode [Figure 5 (A) )] G1 Effects of the Invention (A. Field of Industrial Application) The present invention relates to a novel videotape recorder. Specifically, the gear train from the drive side gear to the supply side reel stand (hereinafter referred to as the rS side reel stand) or the take-up side reel stand (hereinafter referred to as the ``T side reel stand'') must be devised. The tape can be forwarded or rewinded at two different speeds (the slower one is "fast forward or rewind", hereinafter referred to as rFF/REWJ).
The faster one is referred to as "high-speed fast forward or high-speed rewind,"
``Fast F F / RE W J.) Say J.

), the speed of tape forwarding or reversing can be adjusted to the operator's requirements, and the speed of shortening the required time or switching to another mode can be selected. This is what we are trying to provide.

(B. Summary of the Invention) The video tape recorder of the present invention has a drive side gear and a supply side relay gear (hereinafter referred to as "rS side relay gear") when in a predetermined mode.
) or a winding-side relay gear (hereinafter referred to as "T-side relay gear"), and an intermediate gear is provided that connects the drive-side gear, the pendulum gear, and the T-side relay gear or S A switching means is provided for switching between a first gear train consisting of a side relay gear, a second gear train consisting of a drive side gear, an intermediate gear, and a T side relay gear or an S side relay gear, The ratio is set lower than the reduction ratio of the first gear train, and the FF/FLEW
In the mode, the first gear train rotates the T-side reel stand or the S-side reel stand with the tape still being loaded, and in the high-speed FF/REW mode, the tape moves in the unloading direction. By rotating the T-side reel stand or the S-side reel stand from the second gear train in the returned state, the FF/REW mode can be easily established with a simple structure and without increasing the number of parts. Or high speed FF/R
The EW mode can be selected.

(C, Prior Art) [Figure 6] In recent years, in order to simplify the mechanism of video tape recorders, a motor that drives the capstan shaft and two
It is designed to be common to the motor that drives two reel stands.

FIG. 6 shows m video tape recorders in which one motor drives the capstan shaft and two reel stands.

b is the S side reel stand gear, C is the T side reel stand gear,
Both reel stand gears b and c are located on the upper surface side of the mechanical chassis d with an appropriate interval between them, and are rotatably supported by the mechanical chassis d.

Reference character e denotes a capstan shaft, and the output shaft of a capstan motor f attached to the lower surface of the mechanical chassis d passes through the mechanical chassis d upward to form a capstan shaft e.

A pinch roller g is opposed to the capstan @e and is pressed against the capstan shaft e.

h is a drive pulley fixed to the output shaft of the capstan motor f, and is located on the lower surface side of the mechanical chassis d.

Reference character i denotes a driven pulley, which is located on the lower surface side of the mechanical chassis d, approximately in the middle of the two reel stand gears b and c.

j is a driven gear, which is formed concentrically and integrally with the driven pulley i, and is located on the upper surface side of the mechanical chassis d.

k is a swinging lever, which is rotatably supported above the driven gear j and on the rotating shaft of the driven pulley i and the driven gear j; A pendulum gear I meshed with a gear j is rotatably supported.

Relay gears m and n are rotatably supported on the upper surface of the mechanical chassis d, and are always meshed with the S-side reel base gear b and the T-side reel base gear C, respectively.

0 is an endless belt that is stretched between a driving pulley h and a driven pulley i.

A rotary head drum p is rotatably supported on the upper surface of the core chassis d, and the tape r of the tape cassette q is wound at a predetermined winding angle by tape loading.

In addition, when the tape cassette q loaded in the video tape recorder a is in a predetermined mode, the tape r is pulled out from inside the tape cassette q by a loading mechanism (not shown) to perform tape loading, and when the tape r is in another mode, the tape cassette q is loaded. The tape is then returned to the tape cassette q by a loading mechanism.

For example, in the playback mode, the tape is loaded, and the pinch roller g is attached to the capstan shaft e.
is crimped, the capstan motor f is rotated counterclockwise when viewed from above, and the capstan shaft e and pinch roller g feed the tape r toward the T side and the slider base, and the driven gear j is rotated counterclockwise, the oscillating lever k is oscillated to the T-side gear C side, the pendulum gear 1 is engaged with the T-side relay gear n&:, and the rotation of the driven gear j is caused to oscillate. It is transmitted to the T-side thread stand C via the gear and T-side relay gear n, and the T-side thread stand C is rotated clockwise to wind up the tape r.

In addition, in the reverse playback mode, the capstan motor f is rotated clockwise with the tape loaded and the pinch roller g pressed against the capstan shaft e, and the pinch roller g is pressed against the capstan shaft e. The tape r is sent to the rotary head drum p side by the roller g, and the oscillating lever k is oscillated to the S side and the swing gear b side, and the pendulum gear dan is engaged with the S side relay gear m, and the swing lever k is swung to the S side. The thread base gear b is rotated counterclockwise to wind up the tape r.

Furthermore, in the FF/REW mode, the tape r is pulled back into the tape cassette q by the loading mechanism, the capstan motor f is rotated counterclockwise or clockwise, and the driven gear j is rotated counterclockwise. Or, rotate it clockwise to swing the swinging lever k to the T side - slide gear C side or the S side - slide gear b side, and move the pendulum gear p to the T side.
It is meshed with side relay gear n or S side relay gear m, and the rotation of driven gear j is controlled by a pendulum gear, through T side relay gear n or S side relay gear m. The transmission is transmitted to the wheel stand gear b, and the T side wheel stand C is rotated clockwise or S.
The tape r is wound by rotating the side reel stand counterclockwise.

In addition, in FF/REW mode, the capstan motor f
The voltage or current supplied thereto is controlled so that it is rotated at a higher speed than in the playback mode or reverse playback mode.

(D. Problems to be Solved by the Invention) However, in the video tape recorder a described above, since FF/REW is performed in a state where the tape is not loaded, 5. Although the winding speed of the tape r in FF/REW mode can be increased and the required time can be shortened, there is a problem that switching from FF/REW mode to playback mode or reverse playback mode is slow. .

That is, when switching from FF/REW mode to playback mode or reverse playback mode, it is necessary to pull out tape r from tape cassette q and form a predetermined tape path.
The transition to the playback mode or reverse playback mode is delayed by the time required for this.

It is also possible to perform FF/REW with tape r still loaded, but running it at high speed with tape r still loaded is
There was also the problem that the FF/REW speed could not be made very high because the tape r was used to scratching its surface.

(E. Means for Solving the Problems) Therefore, in order to solve the above problems, the video tape recorder of the present invention provides a first a second gear train consisting of a driving side gear, an intermediate gear, and a T-side relay gear or an S-side relay gear; In FF/REW mode, the first gear train rotates the T-side reel stand or the S-side reel stand with the tape still loaded, and the high-speed FF/REW mode In the REW mode, the second gear train rotates the T-side reel stand or the S-side reel stand with the tape returned in the unloading direction.

Therefore, according to the video tape recorder of the present invention, the tape can be fed or returned in two states: a state in which the tape remains loaded and a state in which the tape is returned in the unloading direction. In the FF/REW mode, which is performed while the tape is loaded, the tape running speed is not so high, but the time required to switch to playback mode or reverse playback mode can be shortened, and the tape is In the high-speed FF/REW mode performed while the tape is returned in the unloading direction, the time required for tape forwarding or returning can be shortened, and the mechanism for forming such a mode is not particularly complicated. It can be configured without having to do anything.

(F. Embodiment) [FIGS. 1 to 5] Details of the video tape recorder of the present invention will be explained below according to the illustrated embodiment.

(a, video tape recorder) [Figure 1] l is a video tape recorder, 2 is its mechanical chassis, on the top side of the mechanical chassis 2, in front of its center (in Figure 1, the downward direction is The direction facing upward is the front side, the direction facing upwards is the rear side, the direction facing the right side is the right side, and the direction facing the left side is the left side.In the following explanation, this direction will be used when referring to the direction.) An S-side reel stand 3 and a T-side reel stand 4 are arranged so as to be rotatable with respect to the mechanical chassis 2, spaced apart from each other in the left and right positions, and each reel stand 3
．． 4 are respectively formed with reel stand gears 3a and 4a.

Reference numeral 5 denotes a capstan motor disposed on the bottom side of the mechanical chassis 2 behind the T-side stool 4, and the output shaft of the capstan motor 5 passes through the mechanical chassis 2 and protrudes to the top side thereof. and is used as the capstan shaft 6.

7 is a pinch roller disposed on the upper surface side of the mechanical chassis 2 facing the capstan shaft 6;
is pressed against the capstan shaft 6 in order to run the tape at a constant speed when the video tape recorder 1 is in a mode for reproducing image signals or the like.

Reference numeral 8 denotes a drive boot located below the capstan motor 5 and fixed to its output shaft.

Reference numeral 9 denotes a tape cassette, and when it is installed in a predetermined position of the video tape recorder 1, the tape 10 is pulled out and wound around the rotating head drum 11 at a predetermined wrapping angle.
Further, predetermined tape paths are formed by various tape guides.

(b. Drive system) [Figures 1 to 5] Reference numeral 12 is located on the lower surface side of the mechanical chassis 2, between the S side reel stand 3 and the T side reel stand 4, and the mechanical This is a sub-plate attached to the chassis 2 with an appropriate spacing therebetween, and various gears are supported on the sub-plate 12.

Reference numeral 13 denotes a driven pulley, which is rotatably supported on the lower surface of the mechanical chassis 2 on the cargo side below the position where the T-side stool table 4 is located.
A spur gear 14 having a slightly smaller diameter than the driven pulley 13 is integrally formed on the upper surface of the driven pulley 13.

The driven pulley 13 and the drive pulley 8 are located at approximately the same height in the vertical direction, and an endless belt 15 is placed between them.
The stake has been passed.

(c, Switching means) [Figs. 2 to 5] Reference numeral 16 is a support shaft implanted in the right end of the sub-plate 12 so as to project upward, and the support shaft 15 has a rotatable and , axial,
That is, a mode switching gear 17 is supported so as to be movable in the vertical direction, and the mode switching gear 17 is made of a plane gear and is always meshed with the spur gear 14.

Further, a coil spring 18 externally fitted onto the support shaft 16 is interposed between the sub-plate 12 and the mode switching gear 17, and the mode switching gear 17 is biased with upward force.

Reference numeral 19 denotes a suppressor that suppresses the mote switching gear 17 at a position below the support shaft 16 against the elastic force of the coil spring 18, and the suppressor 19 is a flat member opening to the left when viewed from above. The arm portions 19a, 19a of the support piece 20.20, which is erected near the mode switching gear 17 of the sub-plate 12, has a U-shape, and has an axis extending in the front-rear direction at the upper end of the support piece 20.20. It is rotatably supported, and arm pieces 19c and 1 protrude rightward in the center of the base portion 19b.
9c is formed, and the tip thereof presses the vicinity of the rotation center of the mode switching gear 17 downwardly.
, 190', and furthermore, the arm 19 located at the rear
A pressed portion 19d that extends rearward and is pressed by a slider member to be described later is integrally formed on the lower edge of a.
A spring piece 19e extending downward from the left side edge of the pressed portion 19d and protruding downward through a window formed in the sub-plate 12 is integrally formed.

Further, in the pressing body 19, a tension spring 21 is tensioned between the spring tree piece 19e and a spring tree piece 12a which is on the left side of the spring tree piece 19e and protrudes from the lower surface of the sub-plate 12. The pressing portion 19c''19c' is given a rotational force in the direction of moving downward, thereby pressing the mode switching gear 17 downward, and the pressed portion 19d is moved by a slider member to be described later. When pressed to the right, the suppressor 19 is rotated counterclockwise when viewed from the front, and the downward pressure on the mode switching gear 17 by the press parts 19c' and 19c' is released, and accordingly, the mode switching gear 17 is released from the downward pressure. The switching gear 17 is moved upward by the elastic force of the coil spring 18.

Note that the position where the mode switching gear 17 is pressed downward by the pressing body 19 and held on the base end side of the support shaft 16 is referred to as the downward position, and the downward suppression by the pressing body 19 is released. The position where the spring 18 is pressed upward by the elastic force of the coil spring 18 and is held on the upper end side of the support shaft 16 is referred to as the upper position.

Reference numeral 22 denotes a support shaft that is implanted approximately in the center of the sub-plate 12 so as to project upward, and a drive-side gear body 23 is rotatably supported on the support shaft 22.

The drive side gear body 23 includes a lower gear 24 and an upper flat gear 24.
The limiter gear consists of a rotating sleeve body 25 projecting upward from the center of the upper surface, an upper flat gear 26 integrally formed at the upper end of the rotating sleeve body 25, and a limiter gear 27 rotatably fitted on the rotating sleeve body 25. A compression coil spring 28 is interposed between the limiter gear 27 and the upper spur gear 26, and a felt member (not shown) is interposed between the limiter gear 27 and the upper spur gear 24. In this case, the limiter gear 27, the upper spur gear 24, and the upper spur gear 26 rotate integrally, and as the load increases, the limiter gear 27 and the upper spur gear 24 rotate.
and the upper spur gear 26, and both gears 27, 24 and 2
There is a difference in rotation between the two.

The upper spur gear 26 of the drive side gear body 23 is formed thick, and most of it is positioned on the upper surface side of the mechanical chassis 2 through a window 2a formed therein.

Further, the upper spur gear 24 is in mesh with the mode switching gear 17 when it is in the lower position, and the limiter gear 27 is in mesh with the mode switching gear 17 when it is in the upper position. It is being done.

Reference numeral 29 denotes a support shaft that is planted in the left end of the sub-plate 22 so as to protrude upward, and its tip extends through the window 2b formed to the left of the window 2a of the mechanical chassis 2 to the upper surface side thereof. It is prominent.

30 is a push-up member which has a U-shape with a downward opening when viewed from the side and is used to move an intermediate gear up and down, which will be described later.
The push-up member 30 has both arm pieces 30a, 30a that rotate about an axis extending in the front-rear direction on a support piece 31.31 that is erected in front and back of the left side of the drive-side gear body 23 of the sub-plate 12. A push-up piece 3 is movably supported and protrudes to the left at a position closer to the cargo side than the center of the base portion 30b.
0c is formed integrally with the push-up piece 30c, and a long hole 30d extending in the left-right direction is formed in the push-up piece 30c.
The support shaft 29 is positioned so as to penetrate therethrough.

In the push-up member 30, a compression coil spring 32 is inserted between the lower surface of the push-up piece 30c and the sub-plate 12.
As a result, a clockwise rotational force is applied to the push-up member 3o when viewed from the front.

Further, the one arm piece 3 located at the rear of the push-up member 30
Stopper piece 30 protruding rightward from the lower right edge of 0a
e is prevented from rotating by coming into contact with the upper surface of the sub-plate 22, and the upper right edge of the one arm piece 30a is shaped like a step and is pressed by a slider member described later. 30f is formed.

Further, the upper end of the support shaft 29 is freely supported by a support plate 33 attached to the upper surface of the mechanical chassis 2 with an appropriate distance therebetween.

An intermediate gear, which will be described later, is rotatably and vertically movably supported on the support shaft 29 above the push-up piece 30c, and is rotated clockwise when viewed from the front by the elastic force of the coil spring 32. In this state, the intermediate gear is held at an upper position (hereinafter referred to as the "push-up position") by the push-up piece 30c, and when rotated counterclockwise by a slider member to be described later, the intermediate gear is The gear is held in a position moved downward (hereinafter referred to as "lowered position J").

34 is the lower surface side of the mechanical chassis 2, and is located between the S side reel stand 3 and the T side reel stand 4, and between these reel stands 3.
There is a slider member located at the rear of the line connecting the rotation centers of and 4, and supported by the mechanical chassis 2 so as to be slidable in the left and right direction. The connecting protrusion 34a is integrally formed, and its left edge serves as a first pressing portion 34b that presses the pressed portion 30f of the push-up member 30, and a position slightly to the left of the center thereof is a first pressing portion 34b. A pressing piece 34c protruding downward is integrally formed, and the pressing body 19 is attached to the lower edge of the pressing piece 34c.
A second pressing portion 34d is provided in a protruding manner opposite to the pressed portion 19d.

Further, the distance between the first suppressing part 34b and the second suppressing part 34d is the same as the distance between the pressed part 19d and the push-up member when the suppressing body 19 is pressing the mode switching gear 17 to the lower position. The distance between the intermediate gear 30 and the depressed portion 30f in a state where the coil spring 32 is pushing up an intermediate gear (to be described later) to the push-up position is equal to or slightly larger than the gap.

Reference numeral 35 denotes a cam gear rotatably supported on the lower side of the mechanical chassis 2 at the rear of the T-measure table 4. It is engaged with a worm 37 fixed to the output shaft of the attached mode setting arm 236, and a predetermined cam groove 35b is formed on its upper surface.

Reference numeral 38 denotes a swinging lever rotatably supported by a support shaft 39 protruding from a position to the left of the cam gear 35 on the lower surface side of the mechanical chassis 2; An end portion is supported by the support shaft 39, and an elongated hole 38a extending in the longitudinal direction is formed at the rotating end portion.
Further, a copying pin 38b protruding downward is integrally formed at a position slightly closer to the rotation fulcrum than the center portion.

The swing lever 38 has its follower pin 38b slidably engaged with the cam groove 35b of the cam gear 35, and the connecting protrusion 34a of the slider member 34 is slidably engaged with the elongated hole 38a. engaged.

(d, Operation) [Fig. 5] When the mode setting motor 36 is driven, the cam gear 35 is rotated via the ohm 37, and as a result, the copying pin 38b of the swing lever 38 is moved into the cam groove 35b. The swing lever 38 is rotated by following the shape of the slider 38, and further, the slider member 34 is slid in the left-right direction by rotating the swing lever 38.

The slider member 34 has its first suppressing portion 34b.
The push-up member 30 can be pushed up by any of the
The slider member 3 is set in a state in which the pressed portion 3Of or the pressed portion 19d of the pressing body 19 is not pressed (see FIG. 5(B)) (hereinafter referred to as "B position").
4 is moved to the left, the first pressing part 34b presses the pressed part 30f of the push-up member 30 to the left (see FIG. 5(A)) (hereinafter referred to as "A position"). To tell,)
Therefore, the push-up member 3o is rotated counterclockwise when viewed from the front, and the slider member 34 is
When moved to the right from the position, the second pressing portion 34d presses the pressed portion 19d of the pressing body 19 to the right (see FIG. 5(C)) (hereinafter referred to as “C position”).
Say. ), whereby the pressing body 19 is rotated counterclockwise when viewed from the front, and its pressing portion 19c 1
9c' is in a state where the downward pressure on the mode switching gear 17 is released.

Reference numeral 40 denotes an intermediate gear rotatably supported by a portion of a support shaft 29 implanted in the sub-plate 12 that protrudes upward from the mechanical chassis 2, and is movable in the vertical direction. A sleeve body 41 that protrudes downward is integrally formed in the center part, and the lower end surface of the sleeve body 41 is placed on the peripheral edge of the elongated hole 30d of the push-up piece 30c of the push-up member 30. A support is provided between the upper surface of the intermediate gear 40 and the lower surface of the support plate 33! A compression coil spring 42 externally fitted to d129 is inserted, and the intermediate gear 40
is being pushed downward.

The elastic force of the compression coil spring 42 is set to be weaker than the elastic force of the compression coil spring 32 externally fitted to the lower part of the support @ 29, and the intermediate gear 40 is in a state where it is not pressed by the slider member 34 (position B). or C position), the push-up value M is maintained.

Further, the intermediate gear 40 is always meshed with the upper child gear 26 of the drive side gear body 23, whether it is in the upward position or in the downward position.

43 is an oscillating lever rotatably supported by the support shaft 22 of the drive side gear body 23, the oscillating lever 43 is located above the upper secondary gear 26, and the oscillating lever 43 is located above the upper secondary gear 26, and the oscillating lever 43 is located above the upper secondary gear 26. A pendulum gear 44 meshed with 26 is rotatably supported.

That is, the support shaft 45 is vertically installed on the swing end of the swing lever 43, and the support! A pendulum gear 44 is rotatably supported on the 1Ih45, and the lower end of the support shaft 45 is connected to the mechanical chassis 2.
It protrudes to the lower surface side of the mechanical chassis 2 through a horizontally long rectangular window 2c formed substantially in the middle between the two reel stands 3 and 4.

46.47 is the reel stand gear 3a, 4 of each reel stand 3.4
These relay gears 46 and 47 are in mesh with each other separately and always in mesh with a, and these relay gears 46 and 47 sandwich the pendulum gear 44,
In addition, when the pendulum gear 44 is located approximately in the center position, it does not mesh with either of the relay gears 46, 47, and when it is biased to either side, it meshes with the relay gear 46 or 47 that is biased. It is rotatably supported on the upper surface of the mechanical chassis 2 at a certain position.

Further, a flat gear 48 having a smaller diameter is integrally and concentrically formed on the upper surface of the relay gear 46 on the S side, and meshes with the flat gear 48 when the intermediate gear 40 reaches its lowered position. ing.

(e. Oscillation prevention means) [Fig. 2] Reference numeral 49 denotes a vibration prevention means for preventing the vibration operation of the pendulum gear 44, and the vibration prevention means 49 is connected to the motor that drives it and the motor. It consists of a cam gear and a swing link that convert rotational motion of the swing link into a predetermined rotation, and a slider that converts the rotation of the swing link into a linear motion and presses the pendulum gear 44.

Reference numeral 50 denotes a cam gear consisting of a spur gear, and a cam groove 50a is formed on one surface of the cam gear. It is supported and rotated by the mode setting motor 36 via a gear train (not shown).

Reference numeral 51 denotes a swinging link having an abbreviated shape, the bending portion of which is rotatably supported on the lower surface of the mechanical chassis 2 at a position near the cam gear 50, so that it is rotated with respect to the mechanical chassis 2. The shorter arm 51a extends obliquely to the right rear from the center of swing, and its tip is located between the cam gear 50 and the mechanical chassis 2. Further, the longer arm 51b is positioned so as to extend substantially forward from the center of swing.

Further, a pin 51c protruding downward is integrally formed at the tip of the shorter arm 51a of the swing link 51.
1c is slidably engaged with the cam groove 50a of the cam gear 50, and a connecting pin 51d protruding downward is integrally formed at the end of the longer arm 51b, and the connecting pin 51d is connected to a slider described later. engaged.

Then, the cam gear 50 is rotated by the mode setting motor 36 via a gear train (not shown), and the cam groove 50a is rotated by the mode setting motor 36.
The pin 51c of the shorter arm 51a of the swing link 51, which is engaged with the cam groove 50a, moves along the cam groove 50a.
The swing link 51 swings, and the connecting pin 51d of the longer arm 51b swings substantially in the left-right direction.

Reference numeral 52 denotes a slider made of synthetic resin, which is supported on the lower surface near the front edge of the mechanical chassis 2 so as to be slidable in the left-right direction, and a slot 52a slightly elongated in the width direction is formed at one end of the slider. A connecting pin 51d provided on the longer arm 51b of the swing link 51 is slidably engaged with the elongated hole 52a, and the other end of the slider 52 is connected to the mechanical chassis 2.
The pendulum extends to the rectangular window 2c, and two suppressing pieces 53, 53 that protrude rearward are integrally formed at the other end, and between the two suppressing pieces 53, the pendulum The lower end of the support @45 of the gear 44 is located.

The slider 52 is slid to the left and right when the swing link 51 is swung by the mode setting motor 36, and the two pressing pieces 53 and 53 are used to push the support shaft 45 of the pendulum gear 44. is moved to control the neck vibration operation of the pendulum gear 44.

(f Effect) In the video tape recorder 1 described above, when each mode is selected, the mode setting motor 36 is driven, and the cam gear 35 or 50 is rotated to form a predetermined mode. .

(f-1, playback mode, reverse playback mode) [Figure 5 (C)
] When the playback mode or the reverse playback mode is selected, the slider member 34 is controlled by the cam gear 35 to move from the B position to the C position, and the second pressing portion 3
4d presses the pressed portion 19d of the pressing body 19 to the right, moving the pressing portion 19C'19C' upward, and in conjunction with this, the mode switching gear 17 is moved upward by the elastic force of the compression coil spring 18. Move to position. Then, the mode switching gear 17 that has been moved to the upper position meshes with the limiter gear 27 of the drive side gear body 23.

At the same time, in the case of the playback mode, the capstan motor 5 is rotated counterclockwise to move the tape 10 sandwiched between the capstan @ 6 and the pinch roller 7 to the T side and the slide table 4 side. At the same time, the drive pulley 8 - belt 15 - driven pulley 13 - spur gear 14 - mode switching gear 1
7-Limiter gear 27-The rotation of the upper flat gear 26 of the drive side gear body 23 is transmitted and the upper gear 26 is rotated counterclockwise, and the oscillating lever 43 is moved to the T-side wheel base 4 side. The T-side relay gear 47 and the pendulum gear 44 are engaged with each other, and the T-side thread table 4 is rotated clockwise to wind the tape 10 sent out by the pinch roller 7 and the capstan shaft 6. It is supposed to be taken.

In the playback mode and reverse playback mode, the pressing pieces 53 and 53 of the slider 52 are in a state where they do not press the support shaft 45 of the pendulum gear 44, and the pendulum gear 44 is
It is designed to oscillate in a predetermined direction in response to the direction of rotation of 3.

In addition, in the case of the reverse playback mode, the capstan motor 5 is rotated in the reverse direction, that is, in the clockwise direction, and the tape 10 is sent out to the S side reel stand 3 side. The gear rotates in the opposite direction and the pendulum gear 4
4 performs a neck vibration motion on the S-side reel stand 3 side, thereby rotating the S-side reel stand 3 in the direction in which the tape 10 is wound.

(f-2, FF/REW mode) [Figure 5 (B)] When the FF/REW mode is selected, the pinch roller 7 moves away from the capstan shaft 6, and the tape bus remains as it is, that is, With the tape still being loaded and the pinch roller 7 not moving from the capstan shaft 6, the slider member 34 is controlled by the cam gear 35 to be located at the B position, and its first pressing portion 34b
and the second pressing portion 34d do not press the corresponding push-up member 30, the pressed portion 30f of the pressing body 19, and the pressed portion 19d, thereby causing the mode switching gear 17 to be in the lower position. The intermediate gear 40 is also held in the pushed-up position.

The mode switching gear 17 meshes with the upper spur gear 24 of the drive side gear body 23, and the mode switching gear 17 meshes with the upper spur gear 24 of the drive side gear body 23.
6-pendulum gear 44-relay gear 46 or 47 mesh to form a first gear train, which rotates reel stand gear 3a or 4a in the winding direction of tape 10, resulting in FF/R
EW mode will be formed.

(f-3, high-speed REW mode) [Fig. 5 (A)] When the high-speed REW mode is selected, the slider member 34 is unloaded, that is, returned to the tape cassette 9. The first pressing portion 34 is controlled by the cam gear 35 to move to the A position.
b presses the pressed portion 30f of the push-up member 30 to the left, the push-up member 30 is rotated counterclockwise when viewed from the front, and its push-up piece 30c is moved downward. Then, the intermediate gear 40 placed on the push-up piece 30c of the push-up member 30 is moved to the lowered position by the downward movement of the push-up piece 30c of the push-up member 30 and the elastic force of the compression coil spring 42, and then Intermediate gear 4 moved to lowered position
0 is meshed with a spur gear 48 formed integrally with the S side relay gear 46.

Thus, a second gear train is constituted by the upper flat gear 26 of the drive side gear body 23, the intermediate gear 40, the flat gear 48, and the third side relay gear 46, and the S side reel stand gear 3a is used to wind the tape 10. This results in the formation of a high-speed REW moat.

At this time, the slider 52 supports the pendulum gear 44 @
45 is controlled by the cam gear 50 so as to hold it in the neutral position by the pressing piece 53 thereof. This is to prevent the pendulum gear 44 from meshing with the S-side relay gear 46 due to the swing lever 43 rotating following the rotation of the drive-side gear body 23.

In addition, in the high-speed REW motor, as described above, in the second gear train from the drive side gear body 23 to the S side relay gear 46, the S side relay gear 46 and thereby the small diameter spur gear 48 are connected to each other. are integrally formed, and this small diameter spur gear 4
8 is rotated by intermediate gear 4o, the reduction ratio is lower than that of the first gear train in FF/REW mode. Therefore, the capstan motor in each of FF/REW mode and high-speed REW mode Even if the number of rotations of the S-side reel stand 3 is the same, the S-side reel stand 3 can be rotated at a higher speed in the high-speed REW mode.

(G1 Effect of the Invention) As is clear from the above description, the video tape recorder of the present invention has a drive side gear disposed between the supply side reel stand and the take-up side reel stand, and the drive side A pendulum gear that constantly meshes with the gear and performs a neck vibration operation as the driving gear rotates, and a pendulum gear that meshes with the supply side reel table gear or take-up side reel table gear separately and performs a neck vibration operation. A video tape recorder comprising a supply side relay gear and a take-up side relay gear that mesh with the drive side relay gear and the take-up side relay gear, and an intermediate gear that meshes with the drive side gear and the supply side relay gear or the take-up side relay gear in a predetermined mode. A first gear train includes the drive side gear, the pendulum gear, and the take-up side relay gear or the supply side relay gear; and a second gear train includes the drive side gear, the intermediate gear, and the take-up side relay gear or the supply side relay gear. The gear train has a switching means for switching between the gear trains, and sets the reduction ratio of the second gear train lower than the reduction ratio of the first gear train, and when in fast forward mode or rewind mode,
With the tape still being loaded, the first gear train rotates the take-up reel stand or the supply reel stand;
In addition, when in high-speed fast forward mode or high-speed rewind mode, the second
It is characterized in that the take-up side reel stand or the supply side reel stand is rotated by the gear train.

Therefore, according to the video tape recorder of the present invention, the tape can be fed or returned in two states: a state in which the tape remains loaded and a state in which the tape is returned in the unloading direction. In the FF/REW mode, which is performed while the tape is loaded, the tape running speed is not so high, but the time required to switch to the playback mode or reverse playback mode can be shortened. In the high-speed FF/REW mode that is performed while the tape is returned in the unloading direction, the time required for tape feeding or returning can be shortened, and the mechanism for forming such a mode is particularly designed. It can be configured without complication.

In the above explanation, the tape is unloaded in high-speed REW mode, but it is not necessary to completely unload the tape. Even if you return the tape to an appropriate point in the unloading direction and run it at high speed, the tape will not be completely unloaded. High-speed F while forming a path that does not cause damage
The F/REW mode may also be used.

Further, in the above embodiment, only the high-speed REW mode is formed, but this can also be changed to a case where only the high-speed FF mode is formed, or a case where both the high-speed FF mode and the high-speed REW mode are formed. Of course it's a good thing.

In addition, the structures shown in the above embodiments are merely examples of embodiments of the present invention, and the technical scope of the present invention is not interpreted to be limited by these, and the present invention Various changes can be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

1 to 5 show an example of the implementation of the video tape recorder of the present invention, and FIG. 1 is a schematic plan view of the whole;
Figure 2 is an enlarged plan view of the main part, Figure 3 is the III of Figure 1.
FIG. 4 is an exploded perspective view of the main parts as seen diagonally from the rear, and FIGS. 5 (A) to (C) are schematic side views of the main parts. is the A position, (B
) indicates the B position, (C) indicates the C position, and the 6th
The figure is a plan view showing an example of a conventional video tape recorder. 40... Intermediate gear 5 44... Pendulum gear, 46...
- Supply side relay gear, 47... Explanation of take-up side relay gear code 1... Video tape recorder, 3... Supply side reel stand, 3a... Supply side reel stand gear, 4... Volume Take-up side reel stand, 4a... Take-up side reel stand gear, 23... Drive side gear,

Claims (1)

[Scope of Claims] A drive side gear disposed between a supply side reel stand and a take-up side reel stand, which constantly meshes with the drive side gear and performs a neck vibration operation as the drive side gear rotates. A pendulum gear, a supply side relay gear and a take-up side relay gear that are individually meshed with the supply side reel stand gear or the take-up side reel stand gear and selectively meshed with the pendulum gear subjected to neck vibration, and a predetermined A video tape recorder comprising an intermediate gear that meshes with a drive side gear and a supply side relay gear or a take-up side relay gear when in a mode, the drive side gear, a pendulum gear, and a take-up side relay gear or a supply side relay gear. a first gear train consisting of a side relay gear; and a second gear train consisting of a drive side gear, an intermediate gear, and a take-up side relay gear or a supply side relay gear; The reduction ratio is set lower than the reduction ratio of the first gear train, and when in fast forward mode or rewind mode, the first gear train moves the take-up reel stand or the supply reel while the tape is still loaded. When in high-speed fast forward mode or high-speed rewind mode, rotate the stand, and when in high-speed fast forward mode or high-speed rewind mode, the second
A video tape recorder characterized in that a take-up reel stand or a supply reel stand is rotated by a gear train.