CA1144130A - Tape winding mechanism for a video tape recorder - Google Patents
Tape winding mechanism for a video tape recorderInfo
- Publication number
- CA1144130A CA1144130A CA000350844A CA350844A CA1144130A CA 1144130 A CA1144130 A CA 1144130A CA 000350844 A CA000350844 A CA 000350844A CA 350844 A CA350844 A CA 350844A CA 1144130 A CA1144130 A CA 1144130A
- Authority
- CA
- Canada
- Prior art keywords
- tape
- gear
- loading
- pin
- rotary head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Automatic Tape Cassette Changers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a tape winding mechanism for a video tape recorder which winds a video tape onto a rotary head for video recording and regeneration. Generally video tape is wound slant-wise onto the rotary head, and accomplishes this by having the tape travel slant-wise with respect to the rotary head which is disposed vertically. The pinch roller draws the tape out of the cassette and winds the tape slant-wise onto the rotary head. The rotary head has at its peripheral surface a slant tape guide groove to accomplish the slant-wise winding onto the rotary head.
This invention relates to a tape winding mechanism for a video tape recorder which winds a video tape onto a rotary head for video recording and regeneration. Generally video tape is wound slant-wise onto the rotary head, and accomplishes this by having the tape travel slant-wise with respect to the rotary head which is disposed vertically. The pinch roller draws the tape out of the cassette and winds the tape slant-wise onto the rotary head. The rotary head has at its peripheral surface a slant tape guide groove to accomplish the slant-wise winding onto the rotary head.
Description
~144i30 This device relates to a tape winding mechanism for a vldeo tape recorder, which winds a tape out of a cassette and along the slant face of a tape guide groove formed on a rotary video recording/playback head.
According to the invention there is provided a tape winding mechanism for a video tape recorder, which is provided with a rotary head having at a peripheral surface thereof a slant tape-guide groove through which a video tape is wound for recording and playback of video signals; a loading gear ring being connected with a drive motor to be driven through a gear train to thereby turn in the direction of loading or unloading; a guide plate having a tapered face formed at the ring side corresponding to the slant face of said tape-guide groove at said rotary head and being fixedly positioned with respect to said loading gear ring; a pinch roller supported by said ring which, upon turning of said ring, draws said video tape out of a cassette and winds said tape onto said rotary head while moving vertically along the tapered face of said guide plate, so that said pinch roller may draw the tape out of said cassette and wind the tape along the slant face of said tape guide groove.
An embodiment of the device is shown in the drawings, in which:
Figure 1 is a plan view of an embodiment of the invention, Figures 2 through 4 are views illustrating a cassette, Figure 5 is a view useful in explaining the function of the tape anti-back-scrape device in playback condition, in which the cassette is mounted and the tape is underloading, Figure 6 is a view illustrating the gear train, Figure 7 is a sectional view of the first loading gear ring supported on the chassis by the supporting gear, Figure 8 through 11 show the switching condition of the gear train, in which Figure 8 is a view explaining the loading operation, 1~4~130 Figure 9 is a view for explaining the finished operation for loading, Figure 10 is a view for explaining the unloading operation, Figure 11 is a view for explaining the finished operation for unload-ing, Figures 12 and 13 are views for explaining the working condition of each mechanism while a plunger for press-contacting a pinch roller is in oper-ation or stop, Figures 14 and 15 are views illustrating a guide for the pinch roller, Figure 16 is a side view of the take-out pin, ~LJ _ 2 ~i44i~0 Figure 17 is a partial view showing the rapid feed condition7 Figure 18 is a partial view showing the rewinding condition, ~igure 19 is a view of a brake member, Figures 20 and 21 are views illustrating operation of a lever mechanism for control buttons, Figures 22 and 23 are views illustrating operation thereof, showing the playback locking condition, Figure 24 is a view of the locking mechanism for control buttons in not-operating condition, and Figures 25 and 26 are views illustrating operation of the locking mechanism in Figure 24.
An embodiment of the invention will be detailed with reference to the drawings. Figure 1 shows the whole mechanism not in operation, in wh-ch l is a group of control buttons, 2 is a feeder reel, 3 is a take-up reel, 4 is a pinch roller, 5 is a tape take-out pin, 6 is a rotary head, 7 is a voice control head, 8 is a whole width erasing head, 9 is a voice erasing head, 10 is a capstan, 11 is a flywheel, 12 is a first loading gear ring pivotally supporting the pinch roller 4, 13 is a second loading gear ring provided with the tape take-out pin 5, 14 is a plunger to press-contact the pinch roller 4 with the capstan 10, 15 is an idler for driving the take-up reel 3, 16 is a rapid feed transmission gear, 17 is a return transmission gear, 18 is a motor, 19 is a gear train for transmitting rotation of motor 18 to the first loading gear ring 12 and second loading gear ring 13, and 20 is an automatic stopping plunger. Detailed construction and relative function of each of the above will be described as follows.
A cassette 21 for video tape used in this embodiment is the smallest at present and is about 106mm wide, 68 mm long, and 12 mm thick. A magnetic ~ ! -li4~130 video tape 24 wound onto a pair of t~pe reels 22, 23 are housed within the cassel:te 21 as shown in a plan vi.ew of Figure 2, a bottom view of Figure 3, and a side view of Figure 4. The cassette 21 has at its tape take-out face of the front edge an opening-and-closing lid 25 pivoted at 26 thereto, the lid 25 being normally closed tight by a spring or the like. The cassette 21 also, as shown in Figures 3 and 5, is provided at the front bottom with a recess 27 accommodating therein the pinch roller 4 and a recess 28 accommodating the tape take-out pin 5. Figure 4 shows the cassette 4 set on a cassette mount base 29 located above the reels 2, 3. The cassette base 29, as shown in Figure 5, has cassette ].evel keeping pieces 30, 31, 32 and 33, the pieces 32, 33 forming abutments 34, 35 for the lid 25. ~hen the cassette 21 is set on the base 29 as shown in Figures 4 and 5, the lid 25 abuts at its foremost end against abutments 34, 35, thereby being kept as is opening at the front. At this time, the pinch roller 4 p$voted to the first loading gear ring 12 and the tape take-out pin 5 formed at the second loading gear ring 13 are position-ed within the recesses 27, 28. In order to pull-out the tape 24 shown by the solid line in Figure 5 and keeping it in loading condition (video recording or playback condition), the pinch roller 4 and take-out pin 5, as shown by the phantom line, are positioned at the rear of tape 24 within the recesses 27, 28 respectively. Then, the first and second loading gear rings 12 and 13 are rotated in opposite directions to move the pinch roller 4 and take-out pin 5 in the loading direction, thereby drawing out the tape 24. Hence, the tape 24 applies loading to electric elements, such as rotary head 6, voice control 7, whole width erasing head 8, and voice erasing head 9, and further press-con-tacts with the capstan 10 through the pinch roller 4, whereby Eeed rotation of capstan 10 by the motor 18 and winding-up of the take-up reel 3 through idle roller 15 carry out tape drive for video recording and playback.
Rotations of the first and second loading gear rings 12 and 13 necessary for the above loading by tape 24 are carried out by the gear train 19 connected properly to the motor 18.
In detail, a basic gear 36, as shown in Figure 6, is provided at the rotary shaft of motor 18 and connected to two gears 37, 38 in the relation-ship of being properly switched thereto, the gears 37, 38 being in neutral position. One gear 37 is rotatable in normal direction and connected to a larger gear 39, and the other gear 38 for reversing is connected to the larger gear 39 through an intermediate gear 40. Also, the gear 37 is pivoted to a swingable plate 43 of T-like shape and having pins 41, 42 at both opposite ends thereof, the plate 43 being pivoted at an intermedlate portion between both ends to a shaft 44 of larger gear 39, the pin 41 being biased by a spring 45 in a direction for connecting the gear 37 with the basic gear 36. The gear 38 is pivoted to one end of a rocking plate 47 of L-like shape and having at the other end a pin 46, the plate 47 being pivoted at its intermediate portion to the shaft 44 of larger gear 39 thereby biasing the pin 46 by a spring 48 in a direction for connecting the gear 38 with the basic gear 36. Thus, the two rocking plates 43, 47 are switched to transmit the normal and reverse rotat-ions to the larger gear 39. The larger gear 39 is integral with a pinion 49 whose rotation is transmitted to a speed change gear 50 and a pinion 51 in-tegral therewith.
On the other hand, the first loading gear ring 12 has at its inner periphery a geared groove and is suppported radially by support pinions 52, 53 and 54 in mesh with the geared groove. One support pinion 52 is ; integral with a gear 55 in mesh with the pinion 51 driven by the motor 18 through the gear 37 or 38, whereby normal or reverse rotation of motor 18 is transmitted to the first loading gear ring 12. Upon rotation of first loading li4'1i30 gear ring 12, another connecting gear 56 in mesh with the inner geared groove at the ring 12 is rotated. Then, reverse rotation of first loading gear ring 13 is transmitted through a pinion 57 integral with the gear 56 to the second loading gear ring 15 provided rotatably on the outer periphery of rotary head 6. Hence, the pinion 37 is switched to rotate the first and second loading gear rings 12 and 13 in opposite directions as shown by the arrows, Figure 5, thereby driving the pinch roller 4 and take-out-pin 5 out of the recesses 27, 28 following the rotations of rings 12, 13, thus drawing the tap& 24 out of the cassette 21 toward the opposite peripheral sides or rotary head 6. The pinch roller 4 press-contacts the tape 24 with the capstan 10 by means of the plunger 14 turned-on by a mechanism to be hereinafter described, at which time the tape 24 is put onto the pinch roller 4 side from the taken-out side by pin 5 successively through the whole width erasing head 8, rotary head 6, voice erasing head 9, voice control head 7, and capstan 10. In addition, the support gears 53, 54, which support the first loading gear ring 12 at the inner periphery thereof, are, as shown in Figure 7, fixed to gear shafts 59 rotatably supported to a press-fit member 58 fi~ed to a chassis C respectively.
A mechanism for stopping rotation at the finish of loading or un-loading by the first and second loading gear rings, comprises semicircular re-; 20 cesses 60, 61 ofdifferent depths provided at the outer periphery of ring 12, and two rollers 62, 63 insertable into the recesses 60, 61 respectively as sho~m in Figures 8 through 11. Stopping when loading is finished, as shown in Pigure 9, is carried out by the roller 63 fitting into the recess 61. In detail, the roller 63 is mounted rotatably on one end of a rocking plate 66 which is pivoted to a spindle 64 and biased by a spring 65 to always press-contact the roller 63 against the outer periphery of ring 12, the rocking plate 66 being angled to approach the ring 12 in the loading direction and to escape ~i~4130 from the ring 12 in the unloading direction. A V-shaped recess 67 is formed in the rocking plate 66, which engages with the pin 41 at one end of T-shaped rock:ing plate 43 provided at the normal rotation gear 37. When the roller 63 fits into the recess 61 from the outer periphery of ring 12 in the loading condition shown in Figure 8, the rocking plate 66 swings iD the direction of the arrow in Figure 9 and moves the pin 41 at rocking plate 43 through one side of V-shaped recess 67 against the spring 45 to thereby swing the rocking plate 43 around the shaft 44, thus disengaging the gear 37 from the basic gear 36. Hence, the ring 12, which is rotated in normal direction through the gear 37, stops its rotation in the loading direction.
The ring 12, when the unloading is finished, stops its rotation when the roller 62 fits into the recess 60. In detail, the roller 62 is provided rotatably at one end of a rocking plate 70 which is pivoted to a shaft 68 and biased by a spring 69 to always press-contact the roller 62 against the outer periphery of ring 12, the rocking plate 70 being angled to move the roller 62 toward the ring 12 with respect to the unloading direction and to escape from the ring 12 in the loading direction. Also, the rocking plate 70 has at its other end a hook 71 which corresponds to the pin 46 at L-shaped rocking plate 47 provided at the reverse gear 38. When the roller 62 in unloading condition shown in Figure 10, fits into the recess 60 from the outer periphery of ring 12, the rocking plate 70 turns in the direction of the arrow in Figure 11 to pull the pin 46 at rocking plate 47 to thereby turn the rock-ing plate 47 around the shaft 44, thus disengaging the gear 38 from the basic gear 36. Consequently, the ring 12 reversely rotated through the gear 38 stops its rotation in the unloading direction. The recess 60 is so position-ed that when the pinch roller 4 and take-out pin 5 in association therewith are positioned within the cavities 27, 28 at the cassette 21, the roller 62 'Cl ~
~14~i30 fits into the recess 60. The recess 61 is so positioned that when the pinch roller 4 and take-out pin 5 turn to reach the loading finished positions respectively~ the roller 63 fits into the recess 61.
Furthermore, the normal rotation gear 37 and reverse rotation gear 38 are mutually switched by a regeneration or playback button (PLAY) and video recording button (REC) in a group 1 of operating buttons of self-locking - type to be hereinaf~er described. The button (PLAY~ or (R~C) is operated to move a common slide plate 74 through slide plates 72, 73, the slide plate 74 being pulled by a spring 75 against the operating direction and having at the tip a cam 76. The cam 76, as shown in Figure 11, has cam faces 77, 78 differ-ent in level, the cam faces 77, 78 abutting against the pin 42 on the T-shaPed rocking plate 43 at normal rotation gear 37. When the cam face 77 restricts the pin 42 against the spring 45, in other words, in condition of not operat-ing the buttons 72, 73, the gear 37 disengages from the basic gear 36 to transmit no rotation to the rings 12, 13. However, when the button 72 or 73 is operated, the common slide plate 74 moves to abut the cam face 78 against the pin 42, whereby the T-shaped rocking plate 43 slightly turns because of the spring 45 and the normal rotation gear 37 meshes with the basic gear 36.
Hence, the motor 18 rotates both the rings 12, 13 through the transmission gear train to move the pinch roller 4 and take-out pin 5 in the loading direction.
At the other edge of common slide plate 74 are formed stepped cam faces 79,80, which abut against the pin 46 of L-shaped rocking plate 47 carrying the reverse rotation gear 38. When the cam face 79 restricts the pin 46 against the spring 48, in other words, in condition of operating the button (PLAY) or (REC), the gear 38 disengages from the basic gear 36. When the stop button (STOP) is operated or automatic stopping mechanism acts, in ~ A
li44~
condition of loading as shown in Figure 12, the playback button (PLAY) or video recording button (REC) is released through the self-locking mechanism in control button group 1, and simultaneously the common slide plate 74 returns because of the spring 75. Then, the pin 46 at L-shaped rocking plate 47 moves from the cam face 79 to the came face 80 and abuts thereagainst and the plate 47 slightly turns because of the spring 48 to mesh the reverse ro-tation gear 38 with the basic gear 36, thereby transmitting reverse rotation to the rings 12, 13 towards the unloading condition. In addition, when the unloading is finished to fit the roller 62 into the recess 60 as explained above, the pin 46 on the L-shaped plate 47, even when abutting against the cam face 80, is restricted by the hook 71 of rocking plate 70, whereby the reverse rotation gear 38 is not engaged with the basic gear 36, thus trans-mitting no rotation to the rings 12, 13.
Upon operation of the playback button (PLAY) or video recording button (REC)~ the normal rotation gear 37 engages with the basic gear 36 thro-ugh the cam face 76 at common slide plate 74 and associates with the rings 12, 13 to be in loading condition. When the loading is finished and the pinch roller 4 and take-out pin 5 move together with the tape 24 so as to reach the fixed position-as shown in Figure 12, the roller 63, as shown in Figure 9, ; 20 fits into the recess 61 on ring 12 to move the normal rotation gear 37 away from the basic gear 36 to thereby stop the loading. The rocking plate 66 carrying the roller 63 is provided with an actuator 82 for turning on a switch 81 to actuate the plunger 14, so that the plunger is actuated upon the stop-ping of loading. At the utmost end of plunger 14 is provided a pusher 83 ; turnable around its spindle 84, the pusher 83 urging the pinch roller 4 against the capstan 10 through a contact surface 85 and being connected in association with an elongate slide plate 86 through a connector 87, the slide plate 86 _g_ engaging or disengaging the idler 15 with or from the take-up reel 3 in order to transmit thereto rotation for playback or video recording. The loading starts from the condition shown in Figure 1 and the plunger 14 is actuated as shown in Figure 12, then the contact surface 85 pushes the pinch roller 4 spindle, thereby press-contacting roller 4 with the capstan 10 to convey the tape 4 sandwiching it therebetween.
A tongue 88 is provided on the pusher 83 and abuts against one end of connector 87. The connector 87 swings around its spindle 89 and connects at the other end with a raised part 90 of the elongate slide plate 86 and cooperates therewith. The idler 15 is provided on an arm 92 swingable around a spindle 91, the arm 92 being connected at its edge 93 to the other raised part 94 of slide plate 86 through a spring 95. Hence, when the plung-er 14 is turned-on, the idler 15 abuts against a smaller diameter portion 96 integral with the lower portion of take-up reel 3, following the movement of slide plate 86 in the direction of the arrow, thereby transmitting rotat-ion in the take-up direction to the reel 3 through a drive mechanism to be hereinafter described.
Next, when the playback or video recording is finished and the stop button (STOP) is operated, the plunger 14 is turned-off to release the pinch roller 4 from press-contact with the capstan 10. Ths pin 42 at the T-shaped rocking plate 43 carrying the normal rotation gear 37 which diseng-ages from the basic gear 36 when the roller 63 fits into the recess 61, abuts against the cam face 77 (Figures 8-11) at the common slide plate 74 which returns by the stop butt~n (STOP), thereby keeping the gear 37 disengaged from the basic gear 36. Simultaneously, the pin 46 of L-shaped rocking plate 47 carrying the reverse rotation gear 38 abuts against the cam face 80 of the common slide plate 74, because the roller 62 is positioned on the outer !
periphery of ring 12 (is not fitted into the recess 60) and the hook 71 on the rocking plate 70 is released from the pin 46. At this ti~e the reverse rotation gear 38 meshes with the basic gear 36 to put the ring 12 in unload-ing condition. However even when the plunger 14 is turned-off to put the ring in unloading condition, the tape 24 must be wound-up within the cassette 21. Hence, the elongate slide plate 86, as shown in Figure 13, is provided with a rocking plate 97 which restrains the plate 86 from returning even when the plunger 14 is turned-off, and which keeps the idler 15 in contact with the smaller diameter portion 96 of take-up reel 3. The rocking plate 97 is pivoted at its intermediate portion on a spindle 98, is inserted at one end between two raised portions 99, 100 formed on the elongate slide plate 86, and abuts at the other end against the pin 42 of L-shaped rocking plate 47. In thç unloading condition of meshing the reverse rotation gear 38 with the basic gear 36 as mentioned above, the pin 46 on rocking plate 47 urges the other end of rocking plate 97 to turn the plate 97 around the spindle 98 and the other end of plate 97 checks through the raised part 99 the slide plate 86 which tends to return by turn-off of plunger 14. As a result, even during the unloading, the idler 15 abuts against the smaller diameter portion 96 so as to allow the take-up reel 3 to wind up the tape 4.
Furthermore, a mechanism for placing the tape 4 on the rings 12, 13 will be detailed. The pinch roller 4, as shown in Figures 14 and 15, is pivoted on a spindle 103 at one end of arm 102 pivoted at its other end through a spindle 101 to a cylinder 113 fixed to the ring 12. A pin 104 is provided at the Eoremost end of arm 102. A small arm 10~ is pivoted at its one end to an intermediate portion of arm 102 through a spindle 105 and has at the other end a tapered roller 107. The arm 102 fixedly supports a spindle : ' . !
1~44130 101 which is mounted vertically movably to the cylinder 113 through a spring 108 and supports the pinch roller 4 to escape radially outwardly (in the arrow direction) from the ring 12. The tapered roller 107 similarly is form-ed to escape radially outwardly of the ring 12 through a spring 109. Also, a loading guide 110 properly fixed to the chassis C is provided in the load-ing track of pinch roller 4, so that the pinch roller 4 and tapered roller 107, which are biased radially outwardly of ring 12 through the springs 108, 109 in the escaping direction, abut against the guide roller 110 and are guided therewith from the starting point of loading to the terminus thereof.
In the loading track of pinch roller 4, a guide plate 112 having a tapered surface abutting against the upper portion of spindle 101 for fixing the arm 102, is fixed to a head base 113a carrying heads 7, 8 and 9. The tape 4, which is pulled out by pinch roller 4 simultaneously with the loading, is placed on and along a tape guide groove 115 which is slanted corresponding to a head gap 114 in the cylinder portion of rotary head 6. At this time, the upper end of spindle 101 is guided along the tapered lower surface of guide plate 112 corresponding to the guide groove llS, pinch roller 4 carrying the tape 4 moves downward against the spring 108 between the arm 102 and the cylinder 113, and the tape 4 is placed slantwise on the tape guide groove 115 at rotary head 6 from the side of take-out pin 5 moving relative to pinch roller 4, which is for the purpose of recording video signal slantwise on the tape 4. The tapered roller 107, which is provided on the small arm 106 pivo-ted to arm 102 at pinch roller 4, abuts against a pin 116 formed at the terminus of loading as shown in Figures 5 and 121 small arm 106 turns the spring 109, and tapered roller 107 carrying the tape 24 allows the tape to escape outwardly, so that the tape 24 may not back-scrape against the tape guided toward rotary head 6 and heads 7, 8.
~; ~
1144i30 The take-out pin 5, as shown in Figures 14 and 16, is pivoted on the upper end of spindle 11~ provided on an arm 117 extending ~rom the second loading ring 13, and has a rocking plate 120 pivoted to a spindle 119 fixed to the arm 117. The rocking plate 120 is pivoted to arm 117 through the spindle 119 slightly shifted toward the ring 13 side with respect to the take-out pin, and is provided outwardly from the pin 5 with a tape pin 124. The plate 120 is shaped to surround the spindle 118 outwardly thereof and toward the tape pin 124 side through a curved portion 123, and has at the outer end a projection 122 abutting against a pin 121 formed at the position where the pin 121 is opposite to the pin 116 at the terminus of loading. Also, the plate 120 allows the curved portion 123 to always abut against the periphery of spindle 118 at the take-out pin 5. When the pin 5 moves until the loading terminus, the projection 122 at the utmost end of rocking plate 120 abuts against pin 121, so that the plate 120 turns against the spring 124', whereby the pin 124 carrying the tape 24 leaves the take-out pin 5, thus preventing the tape 24 from back-scraping against the tape guided toward the rotary head 6 and head 8.
Hence, the tape 24, as shown.in Figure 5, is drawn out of the reels - 22 and 23 within the cassette 21 and loaded toward the tape reel 2 at take-up reel 3 from the tape reel 23 fit to the feed reel 2 shaft successively through the pin 124, take-out pin 5, whole width erasing head 8, rotary head 6, voice erasing head 9, voice control head 7, between capstan 10 and pinch roller 4, pin 104, pinch roller 4, and tapered roller 107.
; Next, the tape rapid feed and rewinding mechanism is shown in Figures 17 and 18. A rapid feed button (FF) is operated to be self-locked.
A rapid feed transmitting gear 16, which is pivoted to a slide plate 125 between the pair of reels 2 and 3, engages with a gear formed at the outer ..
i~4~i30 peri.phery of take-up reel 3 as shown in Figure 17, thereby rotating the take-up reel 3 in the winding-up direction through the gear 16 rotatable through a drive mechanism to be hereinafter described, the slide plate 125 being biased in the direction of restoration through a spring 127.
The rewind button (REW), when operated, is self--locked, and a rewinding transmitting gear 17, which is pivoted to a slide plate 128 between the pair of reels 2 and 3, engages with a gear at the outer periphery of feed reel 2 and with the rapid feed transmitting gear 16 as shown in Figure 18, thereby transmitting to the feed reel 2 through the rewinding gear 16 the rotation of rapid feed gear 16 rotatable through a drive mechanism to be here-inafter described, thus rotating the feed reel 2 in the rewinding direction, the slide plate 128 being biased in the return direction through a spring 130.
The rapid feed transmitting gear 16 and rewinding transmitting gear 17 move between the pair of reels 2 and 3, the gear 16 being coupled with the take-up reel 3, the gear 17 being coupled with the gear 16 and with the feed reel 2. Hence, pivot points of gears 16, 17 and locations of slide plates 125, 128 are set to carry out the above operations. The reels 2, 3 and gear 17 are made from synthetic resin and gear 16 is metallic, whereby the metallic gear 16 directly driven by the drive source is rotating to mesh with the gear of stationary reel 3 and gear 17 to thereby form a good gear train. The gear 17 on the slide plate 125, when the rewind button (REW) is pushed, slightly moves against the spring 127, and simultaneously the gear 17 is coupled with the gear of reel 2, thereby improving the connection bet-ween the gears 16 and 17.
The slide plates 125, 128 associate at the tips thereof with a brake member 131, which is of T-shape, has at both ends elastic members 132, 133 press-contacting with the smaller diameter portions 96? 96a (Figures 12 and 13) of reels 2, 3 respectively, and is slidable in the operating direction ~! _ 1~4~
through a slot 135 into which a pin 134 fixed to the chassis C is inserted.
A spring 138 wound at its center onto the pin 134 is retained at both ends to pins 136, 137 projecting from both ends of T-shaped member 131, thereby bias-ing the member 131 in the return direction (the braking direction). The bottom 139 of T-shaped member 131 abuts against the tips 140, 141 of slide plates 125, 128, so that when the slide plate 125 or 128 abuts against the bottom (when in rapid feed or rewinding), the member 131 slides against the spring 138 to move the elastic members 132, 133 apart from the smaller di-ameter portions 96, 96a at reels 2, 3, thereby releasing the reels 2, 3 from braked conditions.
An idle cutout 142 and a groove 143 are formed at a root of T-shaped member 131, so that a pin 144 on the chassis C may be properly switched between the cutout 142 and the notch 143. In detail, a raised part 145 is provided at one side edge of member 131 and cooperates with the raised part 150 formed halfway of the elongate slide plate 86, through two rocking plates 148, 149 swingable around spindles 146, 147 respectively as shown in Figure 13. Hence, during playback, video recording and unloading, the raised part 150 on the slide plate 86 in an active condition, pushes the raised part 145 on braking member 131 through the rocking plates 148, 149, whereby the member 131 rotates around the pin 134 in the arrow direction to contact the pin 144 with one wall of the cutout 142, at which time the elastic member 132 leaves the smaller diameter portion 96 and 133 abuts against the smaller diameter portion 96a. Thus, while braking the reel 2, the reel 3 is released to be rotatable by the idler 15 to thereby wind-up the tape 24 in tension.
Furthermore, another brake member 151, as sho~m in Figure 1, which is provided for the reel 2, is pivoted at its intermediate portion, is turn-able at one end through a tongue 152 toward the arm 117 carrying the take-out pin 5 to thereby release the reel 2 from braking, and has at the other end a tongue 153. The tongue 153 engages with one end of a cassette mounting case (a case pivoted to the chassis, housing the cassette and opening and closing on the cassette base 29) not shown, so that the brake member 151, when the unloading ends, turns to disengage the tongue 151 from the cassette mounting case to thereby keep the case openable. In other words, during loading, the member 151 is kept in the aforesaid engagement to lock the case not to open.
The group 1 of control buttons is of self-locking type, which will be described according to Figures 20 through 23. Bracket members 154, 155 are fixed on the chassis by means of screws. A single lever shaft 156 is horizontally mounted between the bracket members and pivotably supports at regular intervals operating levers 157, 158, 159, 160 and 161 for the rewind button (RE~), rapid feed button (FF), stop button (STOP), playback button (PLAY) and video recording button (REC). To the bracket members 154, 155 are pivoted retainers 162 each of L-shape as shown in Figure 21, a partially sectional view of the regeneration button (PLAY). A spring 163 is wound onto the pivot positon of the retainer 162 and is seated at one end on the bracket member 155 and engages at the other end with the lower surface of retainer 162, thereby always biasing the retainer 162 to be turnable clockwise. A
spring 164 is wound onto the lever shaft 156 and engages at one end with the playback lever 160 and at the other end with a proper spring seat 165, there-by biasing the playback lever 160 always towards the not-operating condition.
The playback lever 160 and other levers 157, 158, 159 and 161, as sho~n in Figure 21 have projections 166 integral with the levers respectively, so that when the respective levers 157 through 161 are active, the projection 166 abuts against the retainer 162 through a slide face 167 to keep each lever in operating condition, and when the levers are inactive, the retainer 162 3. ~
~i4'1~30 engages at its tip with a stopper 168 at the respective levers 157 through 161.
An actuator 169a is provided at the respective levers 157 through 161 and abuts against a leaf spring 169 provided at an operating end of each of the rewinding slide plate 128, rapid feed slide plate 125, playback slide plate 72 and video recording slide plate 73. When each of levers 157 to 161 is operated, the leaf spring 169 allows the respective slide plates 128, 125, 72 and 73 to slide and to be locked in operating condition. The reason for interposing these leaf springs 169 is to absorb a stroke difference because the actuator 169a is larger in stroke than the respective plates 128, 125, 72 and 73, thereby ansuring action of actuator 169a. In addition, the utmost end of lever 159 for the stopping button (STOP) (the utmost end corresponding to the actuator 169a) abuts against a stopper 170 not to engage the tip of retainer 162 with a projection (corresponding to the projection 166) at the chassis C, whereby the stopping lever (STOP) only is not locked.
When the playback slide plate 72 or video recording slide plate 73, is in operating condition, the rewinding slide plate 128 and rapid feed slide plate 125, i.e., rewinding button (R~) and rapid feed button (FF), are locked not to operate. Conversely, when the plate 128 or 125 is in operating condition, other slide plates 72, 73, i.e., playback button (PLAY) and video recording button (REC), are locked not to operate. In detail, projections 171, 172, 173 and 174, as shown in Figure 24, are prov-ided from the respect-ive plates 128, 125, 72 and 73 at its side of operating the respective levers 157, 158, 160, 161. While, a lock plate 179 having tapered faces 175, 176, 177 and 178 abutting against the projections 171 to 174 respectively is provided to be slidable through elongate slots 180, 181 and pins 182, 183 on the chassis in the direction of intercrossing the sliding direction of the ~44130 respective levers 157, 158, 160 and 161. Also, the lock plate 179 has at its central portion a projection 184 which keeps the plate 179 neutral and is positioned together with another pin 185a on the chassis within a U-shaped spring 186 wound onto a pin 185. Referring to Figure 25, for example, when the playback button (PLAY) actuates the lever 160, the projection 173 at slide plate 72 abuts against the tapered face 177 of lock plate 179 to move the plate 179 leftwards and bias it in the return direction through a spring 186. The video recording button (REC) is the same as the above. At this time, the projections 171, 172 abut against the stopping faces 187, 188 to restrain the levers 157, 158 from moving in the operating directions respect-ively. On the contrary, when the rapid feed button (FF) actuates the lever 158, the projection 172 at slide plate 125 abuts against the tapered face 176 at the lock plate 179 to thereby move the plate 179 rightwards and bias it in the return direction through the spring 186. At this time, the projections 173, 174 abut against the stop faces 189, 190 at lock plate 179 to thereby restrain the levers 160, 161 from moving in the operating directions respectively.
Furthermore, the feed reel 2, take-up reel 3 and capstan 10, as shown by the phantom line in Figure 1, are driven in such a manner than one pulley 191 is coupled with the fl~heel 11 through a belt 193, the other pulley 192 is coupled with a pulley 195 at the rapid feed gear 16 through a belt 194, and another pulley 196 at the gear 16 is coupled with a pulley 198 through a belt 197.
Furthermore, the automatic stopping mechanism actuates the plunger 20 to turn on electric elements (not shown) for detecting the finish of un-loading. The plunger 20 engages, as shown in Figures 20 through 23, an actu-ating arm 199 at its hook 200 with the foremost end of L-shaped retainer 162 at the video recording button (REC) sidc thereof, so that the plunger 20 is actuated to turn the retainer 162 against the spring 163 to thereby disengage tl-e retaincr 162 from the projection 166 at the lever, 157, 158, 160 or 161 of any button in operation.
Furthermore, the capstan lO and group of heads 7, 8 and 9, are set opposite to the pair of reels 2, 3 sandwiching the rotary head 6. Especially, in this embodiment, the axis of capstan lO, the axis 201 of rotary head 6, and the center between the pair of reels 2, 3, are aligned. The first loading gear ring 12 and second loading gear ring 13 are aligned at the axes thereof on the above straight line. Hence, the pinch roller 4 and take-out pin 5 are relatively loaded or unloaded to or from the capstan 10 and heads 7, 8 and 9 in the vicinity of the rotary head 6, thereby drawing out the tape nearly at random. Consequently, the mechanism necessary for loading is designed with ease and the tape cassette of small size is adopted to make the whole mechan-ism simple and compact.
According to the invention there is provided a tape winding mechanism for a video tape recorder, which is provided with a rotary head having at a peripheral surface thereof a slant tape-guide groove through which a video tape is wound for recording and playback of video signals; a loading gear ring being connected with a drive motor to be driven through a gear train to thereby turn in the direction of loading or unloading; a guide plate having a tapered face formed at the ring side corresponding to the slant face of said tape-guide groove at said rotary head and being fixedly positioned with respect to said loading gear ring; a pinch roller supported by said ring which, upon turning of said ring, draws said video tape out of a cassette and winds said tape onto said rotary head while moving vertically along the tapered face of said guide plate, so that said pinch roller may draw the tape out of said cassette and wind the tape along the slant face of said tape guide groove.
An embodiment of the device is shown in the drawings, in which:
Figure 1 is a plan view of an embodiment of the invention, Figures 2 through 4 are views illustrating a cassette, Figure 5 is a view useful in explaining the function of the tape anti-back-scrape device in playback condition, in which the cassette is mounted and the tape is underloading, Figure 6 is a view illustrating the gear train, Figure 7 is a sectional view of the first loading gear ring supported on the chassis by the supporting gear, Figure 8 through 11 show the switching condition of the gear train, in which Figure 8 is a view explaining the loading operation, 1~4~130 Figure 9 is a view for explaining the finished operation for loading, Figure 10 is a view for explaining the unloading operation, Figure 11 is a view for explaining the finished operation for unload-ing, Figures 12 and 13 are views for explaining the working condition of each mechanism while a plunger for press-contacting a pinch roller is in oper-ation or stop, Figures 14 and 15 are views illustrating a guide for the pinch roller, Figure 16 is a side view of the take-out pin, ~LJ _ 2 ~i44i~0 Figure 17 is a partial view showing the rapid feed condition7 Figure 18 is a partial view showing the rewinding condition, ~igure 19 is a view of a brake member, Figures 20 and 21 are views illustrating operation of a lever mechanism for control buttons, Figures 22 and 23 are views illustrating operation thereof, showing the playback locking condition, Figure 24 is a view of the locking mechanism for control buttons in not-operating condition, and Figures 25 and 26 are views illustrating operation of the locking mechanism in Figure 24.
An embodiment of the invention will be detailed with reference to the drawings. Figure 1 shows the whole mechanism not in operation, in wh-ch l is a group of control buttons, 2 is a feeder reel, 3 is a take-up reel, 4 is a pinch roller, 5 is a tape take-out pin, 6 is a rotary head, 7 is a voice control head, 8 is a whole width erasing head, 9 is a voice erasing head, 10 is a capstan, 11 is a flywheel, 12 is a first loading gear ring pivotally supporting the pinch roller 4, 13 is a second loading gear ring provided with the tape take-out pin 5, 14 is a plunger to press-contact the pinch roller 4 with the capstan 10, 15 is an idler for driving the take-up reel 3, 16 is a rapid feed transmission gear, 17 is a return transmission gear, 18 is a motor, 19 is a gear train for transmitting rotation of motor 18 to the first loading gear ring 12 and second loading gear ring 13, and 20 is an automatic stopping plunger. Detailed construction and relative function of each of the above will be described as follows.
A cassette 21 for video tape used in this embodiment is the smallest at present and is about 106mm wide, 68 mm long, and 12 mm thick. A magnetic ~ ! -li4~130 video tape 24 wound onto a pair of t~pe reels 22, 23 are housed within the cassel:te 21 as shown in a plan vi.ew of Figure 2, a bottom view of Figure 3, and a side view of Figure 4. The cassette 21 has at its tape take-out face of the front edge an opening-and-closing lid 25 pivoted at 26 thereto, the lid 25 being normally closed tight by a spring or the like. The cassette 21 also, as shown in Figures 3 and 5, is provided at the front bottom with a recess 27 accommodating therein the pinch roller 4 and a recess 28 accommodating the tape take-out pin 5. Figure 4 shows the cassette 4 set on a cassette mount base 29 located above the reels 2, 3. The cassette base 29, as shown in Figure 5, has cassette ].evel keeping pieces 30, 31, 32 and 33, the pieces 32, 33 forming abutments 34, 35 for the lid 25. ~hen the cassette 21 is set on the base 29 as shown in Figures 4 and 5, the lid 25 abuts at its foremost end against abutments 34, 35, thereby being kept as is opening at the front. At this time, the pinch roller 4 p$voted to the first loading gear ring 12 and the tape take-out pin 5 formed at the second loading gear ring 13 are position-ed within the recesses 27, 28. In order to pull-out the tape 24 shown by the solid line in Figure 5 and keeping it in loading condition (video recording or playback condition), the pinch roller 4 and take-out pin 5, as shown by the phantom line, are positioned at the rear of tape 24 within the recesses 27, 28 respectively. Then, the first and second loading gear rings 12 and 13 are rotated in opposite directions to move the pinch roller 4 and take-out pin 5 in the loading direction, thereby drawing out the tape 24. Hence, the tape 24 applies loading to electric elements, such as rotary head 6, voice control 7, whole width erasing head 8, and voice erasing head 9, and further press-con-tacts with the capstan 10 through the pinch roller 4, whereby Eeed rotation of capstan 10 by the motor 18 and winding-up of the take-up reel 3 through idle roller 15 carry out tape drive for video recording and playback.
Rotations of the first and second loading gear rings 12 and 13 necessary for the above loading by tape 24 are carried out by the gear train 19 connected properly to the motor 18.
In detail, a basic gear 36, as shown in Figure 6, is provided at the rotary shaft of motor 18 and connected to two gears 37, 38 in the relation-ship of being properly switched thereto, the gears 37, 38 being in neutral position. One gear 37 is rotatable in normal direction and connected to a larger gear 39, and the other gear 38 for reversing is connected to the larger gear 39 through an intermediate gear 40. Also, the gear 37 is pivoted to a swingable plate 43 of T-like shape and having pins 41, 42 at both opposite ends thereof, the plate 43 being pivoted at an intermedlate portion between both ends to a shaft 44 of larger gear 39, the pin 41 being biased by a spring 45 in a direction for connecting the gear 37 with the basic gear 36. The gear 38 is pivoted to one end of a rocking plate 47 of L-like shape and having at the other end a pin 46, the plate 47 being pivoted at its intermediate portion to the shaft 44 of larger gear 39 thereby biasing the pin 46 by a spring 48 in a direction for connecting the gear 38 with the basic gear 36. Thus, the two rocking plates 43, 47 are switched to transmit the normal and reverse rotat-ions to the larger gear 39. The larger gear 39 is integral with a pinion 49 whose rotation is transmitted to a speed change gear 50 and a pinion 51 in-tegral therewith.
On the other hand, the first loading gear ring 12 has at its inner periphery a geared groove and is suppported radially by support pinions 52, 53 and 54 in mesh with the geared groove. One support pinion 52 is ; integral with a gear 55 in mesh with the pinion 51 driven by the motor 18 through the gear 37 or 38, whereby normal or reverse rotation of motor 18 is transmitted to the first loading gear ring 12. Upon rotation of first loading li4'1i30 gear ring 12, another connecting gear 56 in mesh with the inner geared groove at the ring 12 is rotated. Then, reverse rotation of first loading gear ring 13 is transmitted through a pinion 57 integral with the gear 56 to the second loading gear ring 15 provided rotatably on the outer periphery of rotary head 6. Hence, the pinion 37 is switched to rotate the first and second loading gear rings 12 and 13 in opposite directions as shown by the arrows, Figure 5, thereby driving the pinch roller 4 and take-out-pin 5 out of the recesses 27, 28 following the rotations of rings 12, 13, thus drawing the tap& 24 out of the cassette 21 toward the opposite peripheral sides or rotary head 6. The pinch roller 4 press-contacts the tape 24 with the capstan 10 by means of the plunger 14 turned-on by a mechanism to be hereinafter described, at which time the tape 24 is put onto the pinch roller 4 side from the taken-out side by pin 5 successively through the whole width erasing head 8, rotary head 6, voice erasing head 9, voice control head 7, and capstan 10. In addition, the support gears 53, 54, which support the first loading gear ring 12 at the inner periphery thereof, are, as shown in Figure 7, fixed to gear shafts 59 rotatably supported to a press-fit member 58 fi~ed to a chassis C respectively.
A mechanism for stopping rotation at the finish of loading or un-loading by the first and second loading gear rings, comprises semicircular re-; 20 cesses 60, 61 ofdifferent depths provided at the outer periphery of ring 12, and two rollers 62, 63 insertable into the recesses 60, 61 respectively as sho~m in Figures 8 through 11. Stopping when loading is finished, as shown in Pigure 9, is carried out by the roller 63 fitting into the recess 61. In detail, the roller 63 is mounted rotatably on one end of a rocking plate 66 which is pivoted to a spindle 64 and biased by a spring 65 to always press-contact the roller 63 against the outer periphery of ring 12, the rocking plate 66 being angled to approach the ring 12 in the loading direction and to escape ~i~4130 from the ring 12 in the unloading direction. A V-shaped recess 67 is formed in the rocking plate 66, which engages with the pin 41 at one end of T-shaped rock:ing plate 43 provided at the normal rotation gear 37. When the roller 63 fits into the recess 61 from the outer periphery of ring 12 in the loading condition shown in Figure 8, the rocking plate 66 swings iD the direction of the arrow in Figure 9 and moves the pin 41 at rocking plate 43 through one side of V-shaped recess 67 against the spring 45 to thereby swing the rocking plate 43 around the shaft 44, thus disengaging the gear 37 from the basic gear 36. Hence, the ring 12, which is rotated in normal direction through the gear 37, stops its rotation in the loading direction.
The ring 12, when the unloading is finished, stops its rotation when the roller 62 fits into the recess 60. In detail, the roller 62 is provided rotatably at one end of a rocking plate 70 which is pivoted to a shaft 68 and biased by a spring 69 to always press-contact the roller 62 against the outer periphery of ring 12, the rocking plate 70 being angled to move the roller 62 toward the ring 12 with respect to the unloading direction and to escape from the ring 12 in the loading direction. Also, the rocking plate 70 has at its other end a hook 71 which corresponds to the pin 46 at L-shaped rocking plate 47 provided at the reverse gear 38. When the roller 62 in unloading condition shown in Figure 10, fits into the recess 60 from the outer periphery of ring 12, the rocking plate 70 turns in the direction of the arrow in Figure 11 to pull the pin 46 at rocking plate 47 to thereby turn the rock-ing plate 47 around the shaft 44, thus disengaging the gear 38 from the basic gear 36. Consequently, the ring 12 reversely rotated through the gear 38 stops its rotation in the unloading direction. The recess 60 is so position-ed that when the pinch roller 4 and take-out pin 5 in association therewith are positioned within the cavities 27, 28 at the cassette 21, the roller 62 'Cl ~
~14~i30 fits into the recess 60. The recess 61 is so positioned that when the pinch roller 4 and take-out pin 5 turn to reach the loading finished positions respectively~ the roller 63 fits into the recess 61.
Furthermore, the normal rotation gear 37 and reverse rotation gear 38 are mutually switched by a regeneration or playback button (PLAY) and video recording button (REC) in a group 1 of operating buttons of self-locking - type to be hereinaf~er described. The button (PLAY~ or (R~C) is operated to move a common slide plate 74 through slide plates 72, 73, the slide plate 74 being pulled by a spring 75 against the operating direction and having at the tip a cam 76. The cam 76, as shown in Figure 11, has cam faces 77, 78 differ-ent in level, the cam faces 77, 78 abutting against the pin 42 on the T-shaPed rocking plate 43 at normal rotation gear 37. When the cam face 77 restricts the pin 42 against the spring 45, in other words, in condition of not operat-ing the buttons 72, 73, the gear 37 disengages from the basic gear 36 to transmit no rotation to the rings 12, 13. However, when the button 72 or 73 is operated, the common slide plate 74 moves to abut the cam face 78 against the pin 42, whereby the T-shaped rocking plate 43 slightly turns because of the spring 45 and the normal rotation gear 37 meshes with the basic gear 36.
Hence, the motor 18 rotates both the rings 12, 13 through the transmission gear train to move the pinch roller 4 and take-out pin 5 in the loading direction.
At the other edge of common slide plate 74 are formed stepped cam faces 79,80, which abut against the pin 46 of L-shaped rocking plate 47 carrying the reverse rotation gear 38. When the cam face 79 restricts the pin 46 against the spring 48, in other words, in condition of operating the button (PLAY) or (REC), the gear 38 disengages from the basic gear 36. When the stop button (STOP) is operated or automatic stopping mechanism acts, in ~ A
li44~
condition of loading as shown in Figure 12, the playback button (PLAY) or video recording button (REC) is released through the self-locking mechanism in control button group 1, and simultaneously the common slide plate 74 returns because of the spring 75. Then, the pin 46 at L-shaped rocking plate 47 moves from the cam face 79 to the came face 80 and abuts thereagainst and the plate 47 slightly turns because of the spring 48 to mesh the reverse ro-tation gear 38 with the basic gear 36, thereby transmitting reverse rotation to the rings 12, 13 towards the unloading condition. In addition, when the unloading is finished to fit the roller 62 into the recess 60 as explained above, the pin 46 on the L-shaped plate 47, even when abutting against the cam face 80, is restricted by the hook 71 of rocking plate 70, whereby the reverse rotation gear 38 is not engaged with the basic gear 36, thus trans-mitting no rotation to the rings 12, 13.
Upon operation of the playback button (PLAY) or video recording button (REC)~ the normal rotation gear 37 engages with the basic gear 36 thro-ugh the cam face 76 at common slide plate 74 and associates with the rings 12, 13 to be in loading condition. When the loading is finished and the pinch roller 4 and take-out pin 5 move together with the tape 24 so as to reach the fixed position-as shown in Figure 12, the roller 63, as shown in Figure 9, ; 20 fits into the recess 61 on ring 12 to move the normal rotation gear 37 away from the basic gear 36 to thereby stop the loading. The rocking plate 66 carrying the roller 63 is provided with an actuator 82 for turning on a switch 81 to actuate the plunger 14, so that the plunger is actuated upon the stop-ping of loading. At the utmost end of plunger 14 is provided a pusher 83 ; turnable around its spindle 84, the pusher 83 urging the pinch roller 4 against the capstan 10 through a contact surface 85 and being connected in association with an elongate slide plate 86 through a connector 87, the slide plate 86 _g_ engaging or disengaging the idler 15 with or from the take-up reel 3 in order to transmit thereto rotation for playback or video recording. The loading starts from the condition shown in Figure 1 and the plunger 14 is actuated as shown in Figure 12, then the contact surface 85 pushes the pinch roller 4 spindle, thereby press-contacting roller 4 with the capstan 10 to convey the tape 4 sandwiching it therebetween.
A tongue 88 is provided on the pusher 83 and abuts against one end of connector 87. The connector 87 swings around its spindle 89 and connects at the other end with a raised part 90 of the elongate slide plate 86 and cooperates therewith. The idler 15 is provided on an arm 92 swingable around a spindle 91, the arm 92 being connected at its edge 93 to the other raised part 94 of slide plate 86 through a spring 95. Hence, when the plung-er 14 is turned-on, the idler 15 abuts against a smaller diameter portion 96 integral with the lower portion of take-up reel 3, following the movement of slide plate 86 in the direction of the arrow, thereby transmitting rotat-ion in the take-up direction to the reel 3 through a drive mechanism to be hereinafter described.
Next, when the playback or video recording is finished and the stop button (STOP) is operated, the plunger 14 is turned-off to release the pinch roller 4 from press-contact with the capstan 10. Ths pin 42 at the T-shaped rocking plate 43 carrying the normal rotation gear 37 which diseng-ages from the basic gear 36 when the roller 63 fits into the recess 61, abuts against the cam face 77 (Figures 8-11) at the common slide plate 74 which returns by the stop butt~n (STOP), thereby keeping the gear 37 disengaged from the basic gear 36. Simultaneously, the pin 46 of L-shaped rocking plate 47 carrying the reverse rotation gear 38 abuts against the cam face 80 of the common slide plate 74, because the roller 62 is positioned on the outer !
periphery of ring 12 (is not fitted into the recess 60) and the hook 71 on the rocking plate 70 is released from the pin 46. At this ti~e the reverse rotation gear 38 meshes with the basic gear 36 to put the ring 12 in unload-ing condition. However even when the plunger 14 is turned-off to put the ring in unloading condition, the tape 24 must be wound-up within the cassette 21. Hence, the elongate slide plate 86, as shown in Figure 13, is provided with a rocking plate 97 which restrains the plate 86 from returning even when the plunger 14 is turned-off, and which keeps the idler 15 in contact with the smaller diameter portion 96 of take-up reel 3. The rocking plate 97 is pivoted at its intermediate portion on a spindle 98, is inserted at one end between two raised portions 99, 100 formed on the elongate slide plate 86, and abuts at the other end against the pin 42 of L-shaped rocking plate 47. In thç unloading condition of meshing the reverse rotation gear 38 with the basic gear 36 as mentioned above, the pin 46 on rocking plate 47 urges the other end of rocking plate 97 to turn the plate 97 around the spindle 98 and the other end of plate 97 checks through the raised part 99 the slide plate 86 which tends to return by turn-off of plunger 14. As a result, even during the unloading, the idler 15 abuts against the smaller diameter portion 96 so as to allow the take-up reel 3 to wind up the tape 4.
Furthermore, a mechanism for placing the tape 4 on the rings 12, 13 will be detailed. The pinch roller 4, as shown in Figures 14 and 15, is pivoted on a spindle 103 at one end of arm 102 pivoted at its other end through a spindle 101 to a cylinder 113 fixed to the ring 12. A pin 104 is provided at the Eoremost end of arm 102. A small arm 10~ is pivoted at its one end to an intermediate portion of arm 102 through a spindle 105 and has at the other end a tapered roller 107. The arm 102 fixedly supports a spindle : ' . !
1~44130 101 which is mounted vertically movably to the cylinder 113 through a spring 108 and supports the pinch roller 4 to escape radially outwardly (in the arrow direction) from the ring 12. The tapered roller 107 similarly is form-ed to escape radially outwardly of the ring 12 through a spring 109. Also, a loading guide 110 properly fixed to the chassis C is provided in the load-ing track of pinch roller 4, so that the pinch roller 4 and tapered roller 107, which are biased radially outwardly of ring 12 through the springs 108, 109 in the escaping direction, abut against the guide roller 110 and are guided therewith from the starting point of loading to the terminus thereof.
In the loading track of pinch roller 4, a guide plate 112 having a tapered surface abutting against the upper portion of spindle 101 for fixing the arm 102, is fixed to a head base 113a carrying heads 7, 8 and 9. The tape 4, which is pulled out by pinch roller 4 simultaneously with the loading, is placed on and along a tape guide groove 115 which is slanted corresponding to a head gap 114 in the cylinder portion of rotary head 6. At this time, the upper end of spindle 101 is guided along the tapered lower surface of guide plate 112 corresponding to the guide groove llS, pinch roller 4 carrying the tape 4 moves downward against the spring 108 between the arm 102 and the cylinder 113, and the tape 4 is placed slantwise on the tape guide groove 115 at rotary head 6 from the side of take-out pin 5 moving relative to pinch roller 4, which is for the purpose of recording video signal slantwise on the tape 4. The tapered roller 107, which is provided on the small arm 106 pivo-ted to arm 102 at pinch roller 4, abuts against a pin 116 formed at the terminus of loading as shown in Figures 5 and 121 small arm 106 turns the spring 109, and tapered roller 107 carrying the tape 24 allows the tape to escape outwardly, so that the tape 24 may not back-scrape against the tape guided toward rotary head 6 and heads 7, 8.
~; ~
1144i30 The take-out pin 5, as shown in Figures 14 and 16, is pivoted on the upper end of spindle 11~ provided on an arm 117 extending ~rom the second loading ring 13, and has a rocking plate 120 pivoted to a spindle 119 fixed to the arm 117. The rocking plate 120 is pivoted to arm 117 through the spindle 119 slightly shifted toward the ring 13 side with respect to the take-out pin, and is provided outwardly from the pin 5 with a tape pin 124. The plate 120 is shaped to surround the spindle 118 outwardly thereof and toward the tape pin 124 side through a curved portion 123, and has at the outer end a projection 122 abutting against a pin 121 formed at the position where the pin 121 is opposite to the pin 116 at the terminus of loading. Also, the plate 120 allows the curved portion 123 to always abut against the periphery of spindle 118 at the take-out pin 5. When the pin 5 moves until the loading terminus, the projection 122 at the utmost end of rocking plate 120 abuts against pin 121, so that the plate 120 turns against the spring 124', whereby the pin 124 carrying the tape 24 leaves the take-out pin 5, thus preventing the tape 24 from back-scraping against the tape guided toward the rotary head 6 and head 8.
Hence, the tape 24, as shown.in Figure 5, is drawn out of the reels - 22 and 23 within the cassette 21 and loaded toward the tape reel 2 at take-up reel 3 from the tape reel 23 fit to the feed reel 2 shaft successively through the pin 124, take-out pin 5, whole width erasing head 8, rotary head 6, voice erasing head 9, voice control head 7, between capstan 10 and pinch roller 4, pin 104, pinch roller 4, and tapered roller 107.
; Next, the tape rapid feed and rewinding mechanism is shown in Figures 17 and 18. A rapid feed button (FF) is operated to be self-locked.
A rapid feed transmitting gear 16, which is pivoted to a slide plate 125 between the pair of reels 2 and 3, engages with a gear formed at the outer ..
i~4~i30 peri.phery of take-up reel 3 as shown in Figure 17, thereby rotating the take-up reel 3 in the winding-up direction through the gear 16 rotatable through a drive mechanism to be hereinafter described, the slide plate 125 being biased in the direction of restoration through a spring 127.
The rewind button (REW), when operated, is self--locked, and a rewinding transmitting gear 17, which is pivoted to a slide plate 128 between the pair of reels 2 and 3, engages with a gear at the outer periphery of feed reel 2 and with the rapid feed transmitting gear 16 as shown in Figure 18, thereby transmitting to the feed reel 2 through the rewinding gear 16 the rotation of rapid feed gear 16 rotatable through a drive mechanism to be here-inafter described, thus rotating the feed reel 2 in the rewinding direction, the slide plate 128 being biased in the return direction through a spring 130.
The rapid feed transmitting gear 16 and rewinding transmitting gear 17 move between the pair of reels 2 and 3, the gear 16 being coupled with the take-up reel 3, the gear 17 being coupled with the gear 16 and with the feed reel 2. Hence, pivot points of gears 16, 17 and locations of slide plates 125, 128 are set to carry out the above operations. The reels 2, 3 and gear 17 are made from synthetic resin and gear 16 is metallic, whereby the metallic gear 16 directly driven by the drive source is rotating to mesh with the gear of stationary reel 3 and gear 17 to thereby form a good gear train. The gear 17 on the slide plate 125, when the rewind button (REW) is pushed, slightly moves against the spring 127, and simultaneously the gear 17 is coupled with the gear of reel 2, thereby improving the connection bet-ween the gears 16 and 17.
The slide plates 125, 128 associate at the tips thereof with a brake member 131, which is of T-shape, has at both ends elastic members 132, 133 press-contacting with the smaller diameter portions 96? 96a (Figures 12 and 13) of reels 2, 3 respectively, and is slidable in the operating direction ~! _ 1~4~
through a slot 135 into which a pin 134 fixed to the chassis C is inserted.
A spring 138 wound at its center onto the pin 134 is retained at both ends to pins 136, 137 projecting from both ends of T-shaped member 131, thereby bias-ing the member 131 in the return direction (the braking direction). The bottom 139 of T-shaped member 131 abuts against the tips 140, 141 of slide plates 125, 128, so that when the slide plate 125 or 128 abuts against the bottom (when in rapid feed or rewinding), the member 131 slides against the spring 138 to move the elastic members 132, 133 apart from the smaller di-ameter portions 96, 96a at reels 2, 3, thereby releasing the reels 2, 3 from braked conditions.
An idle cutout 142 and a groove 143 are formed at a root of T-shaped member 131, so that a pin 144 on the chassis C may be properly switched between the cutout 142 and the notch 143. In detail, a raised part 145 is provided at one side edge of member 131 and cooperates with the raised part 150 formed halfway of the elongate slide plate 86, through two rocking plates 148, 149 swingable around spindles 146, 147 respectively as shown in Figure 13. Hence, during playback, video recording and unloading, the raised part 150 on the slide plate 86 in an active condition, pushes the raised part 145 on braking member 131 through the rocking plates 148, 149, whereby the member 131 rotates around the pin 134 in the arrow direction to contact the pin 144 with one wall of the cutout 142, at which time the elastic member 132 leaves the smaller diameter portion 96 and 133 abuts against the smaller diameter portion 96a. Thus, while braking the reel 2, the reel 3 is released to be rotatable by the idler 15 to thereby wind-up the tape 24 in tension.
Furthermore, another brake member 151, as sho~m in Figure 1, which is provided for the reel 2, is pivoted at its intermediate portion, is turn-able at one end through a tongue 152 toward the arm 117 carrying the take-out pin 5 to thereby release the reel 2 from braking, and has at the other end a tongue 153. The tongue 153 engages with one end of a cassette mounting case (a case pivoted to the chassis, housing the cassette and opening and closing on the cassette base 29) not shown, so that the brake member 151, when the unloading ends, turns to disengage the tongue 151 from the cassette mounting case to thereby keep the case openable. In other words, during loading, the member 151 is kept in the aforesaid engagement to lock the case not to open.
The group 1 of control buttons is of self-locking type, which will be described according to Figures 20 through 23. Bracket members 154, 155 are fixed on the chassis by means of screws. A single lever shaft 156 is horizontally mounted between the bracket members and pivotably supports at regular intervals operating levers 157, 158, 159, 160 and 161 for the rewind button (RE~), rapid feed button (FF), stop button (STOP), playback button (PLAY) and video recording button (REC). To the bracket members 154, 155 are pivoted retainers 162 each of L-shape as shown in Figure 21, a partially sectional view of the regeneration button (PLAY). A spring 163 is wound onto the pivot positon of the retainer 162 and is seated at one end on the bracket member 155 and engages at the other end with the lower surface of retainer 162, thereby always biasing the retainer 162 to be turnable clockwise. A
spring 164 is wound onto the lever shaft 156 and engages at one end with the playback lever 160 and at the other end with a proper spring seat 165, there-by biasing the playback lever 160 always towards the not-operating condition.
The playback lever 160 and other levers 157, 158, 159 and 161, as sho~n in Figure 21 have projections 166 integral with the levers respectively, so that when the respective levers 157 through 161 are active, the projection 166 abuts against the retainer 162 through a slide face 167 to keep each lever in operating condition, and when the levers are inactive, the retainer 162 3. ~
~i4'1~30 engages at its tip with a stopper 168 at the respective levers 157 through 161.
An actuator 169a is provided at the respective levers 157 through 161 and abuts against a leaf spring 169 provided at an operating end of each of the rewinding slide plate 128, rapid feed slide plate 125, playback slide plate 72 and video recording slide plate 73. When each of levers 157 to 161 is operated, the leaf spring 169 allows the respective slide plates 128, 125, 72 and 73 to slide and to be locked in operating condition. The reason for interposing these leaf springs 169 is to absorb a stroke difference because the actuator 169a is larger in stroke than the respective plates 128, 125, 72 and 73, thereby ansuring action of actuator 169a. In addition, the utmost end of lever 159 for the stopping button (STOP) (the utmost end corresponding to the actuator 169a) abuts against a stopper 170 not to engage the tip of retainer 162 with a projection (corresponding to the projection 166) at the chassis C, whereby the stopping lever (STOP) only is not locked.
When the playback slide plate 72 or video recording slide plate 73, is in operating condition, the rewinding slide plate 128 and rapid feed slide plate 125, i.e., rewinding button (R~) and rapid feed button (FF), are locked not to operate. Conversely, when the plate 128 or 125 is in operating condition, other slide plates 72, 73, i.e., playback button (PLAY) and video recording button (REC), are locked not to operate. In detail, projections 171, 172, 173 and 174, as shown in Figure 24, are prov-ided from the respect-ive plates 128, 125, 72 and 73 at its side of operating the respective levers 157, 158, 160, 161. While, a lock plate 179 having tapered faces 175, 176, 177 and 178 abutting against the projections 171 to 174 respectively is provided to be slidable through elongate slots 180, 181 and pins 182, 183 on the chassis in the direction of intercrossing the sliding direction of the ~44130 respective levers 157, 158, 160 and 161. Also, the lock plate 179 has at its central portion a projection 184 which keeps the plate 179 neutral and is positioned together with another pin 185a on the chassis within a U-shaped spring 186 wound onto a pin 185. Referring to Figure 25, for example, when the playback button (PLAY) actuates the lever 160, the projection 173 at slide plate 72 abuts against the tapered face 177 of lock plate 179 to move the plate 179 leftwards and bias it in the return direction through a spring 186. The video recording button (REC) is the same as the above. At this time, the projections 171, 172 abut against the stopping faces 187, 188 to restrain the levers 157, 158 from moving in the operating directions respect-ively. On the contrary, when the rapid feed button (FF) actuates the lever 158, the projection 172 at slide plate 125 abuts against the tapered face 176 at the lock plate 179 to thereby move the plate 179 rightwards and bias it in the return direction through the spring 186. At this time, the projections 173, 174 abut against the stop faces 189, 190 at lock plate 179 to thereby restrain the levers 160, 161 from moving in the operating directions respectively.
Furthermore, the feed reel 2, take-up reel 3 and capstan 10, as shown by the phantom line in Figure 1, are driven in such a manner than one pulley 191 is coupled with the fl~heel 11 through a belt 193, the other pulley 192 is coupled with a pulley 195 at the rapid feed gear 16 through a belt 194, and another pulley 196 at the gear 16 is coupled with a pulley 198 through a belt 197.
Furthermore, the automatic stopping mechanism actuates the plunger 20 to turn on electric elements (not shown) for detecting the finish of un-loading. The plunger 20 engages, as shown in Figures 20 through 23, an actu-ating arm 199 at its hook 200 with the foremost end of L-shaped retainer 162 at the video recording button (REC) sidc thereof, so that the plunger 20 is actuated to turn the retainer 162 against the spring 163 to thereby disengage tl-e retaincr 162 from the projection 166 at the lever, 157, 158, 160 or 161 of any button in operation.
Furthermore, the capstan lO and group of heads 7, 8 and 9, are set opposite to the pair of reels 2, 3 sandwiching the rotary head 6. Especially, in this embodiment, the axis of capstan lO, the axis 201 of rotary head 6, and the center between the pair of reels 2, 3, are aligned. The first loading gear ring 12 and second loading gear ring 13 are aligned at the axes thereof on the above straight line. Hence, the pinch roller 4 and take-out pin 5 are relatively loaded or unloaded to or from the capstan 10 and heads 7, 8 and 9 in the vicinity of the rotary head 6, thereby drawing out the tape nearly at random. Consequently, the mechanism necessary for loading is designed with ease and the tape cassette of small size is adopted to make the whole mechan-ism simple and compact.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tape winding mechanism for a video tape recorder, which is provided with a rotary head having at a peripheral sur-face thereof a slant tape-guide groove through which a video tape is wound for recording and playback of video signals; a loading gear ring being connected with a drive motor to be driven through a gear train to thereby turn in the direction of loading or unloading; a guide plate having a tapered face formed at the ring side corresponding to the slant face of said tape-guide groove at said rotary head and being fixedly positioned with respect to said loading gear ring; a pinch roller supported by said ring which, upon turning of said ring, draws said video tape out of a cassette and winds said tape onto said rotary head while moving vertically along the tapered face of said guide plate, so that said pinch roller may draw the tape out of said cassette and wind the tape along the slant face of said tape guide groove.
2. A tape winding mechanism as claimed in claim 1 including a tape take-out pin and means to move said pinch roller and take-out pin in respective arcuate paths in opposite directions from an unloaded position within the cassette to a loaded position to withdraw tape from the cassette and wrap a portion of tape around a portion of the circumference of the rotary head.
3. The device defined in claim 2 including a second loading gear ring mounted for rotation about an axis, said take-out pin being mounted on said second gear ring.
4. The device defined in claim 3, wherein the pinch roller means and take-out pin means comprise tape withdrawal members and are disposed away from the cassette beyond the far side of the rotary video transducer head means when in their loaded positions whereby the tape moves toward and away from the roller means and pin means in each case in two oppositely moving elon-gated paths, and tape guide means is provided to prevent surface contact between oppositely moving tape.
5. The device defined in claim 4, wherein said tape guide means comprises a vertical member mounted on a pivoted arm dis-posed inwardly in unloaded position and movable outwardly when in loaded position to carry tape in one of said two paths out of contact with tape in the other path.
6. The device defined in claim 5, wherein said tape guide means includes biassing means urging it inwardly, and stop means is provided to abut against said pivoted arm to move it outwardly at the loaded position.
7. The device defined in claim 5, wherein said vertical member comprises an inverted tapered roller.
8. The device defined in claim 7, wherein said pivoted arm includes means biassing said arm toward outward movement.
9. The device defined in claim 8, wherein circular guide means is provided outwardly of the arm carrying said tapered roller to prevent outward movement of the roller except adjacent the loaded position.
10. The device defined in claim 7, 8 or 9, wherein both of said tape withdrawal members include a vertical member mounted on a pivoted arm disposed inwardly in unloaded position and movable outwardly when approaching the loaded position, and stop pins to hold the arms outwardly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000350844A CA1144130A (en) | 1980-04-29 | 1980-04-29 | Tape winding mechanism for a video tape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000350844A CA1144130A (en) | 1980-04-29 | 1980-04-29 | Tape winding mechanism for a video tape recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1144130A true CA1144130A (en) | 1983-04-05 |
Family
ID=4116808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000350844A Expired CA1144130A (en) | 1980-04-29 | 1980-04-29 | Tape winding mechanism for a video tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1144130A (en) |
-
1980
- 1980-04-29 CA CA000350844A patent/CA1144130A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |