Abstract:
An apparatus for transmitting the turning force of a capstan flywheel for video cassette recorders by which the turning force of the capstan flywheel driven by a capstan motor is transmitted to the reel disk selectably at high speed and low speed. The apapratus includes a slider gear provided with a clutch gear slidably mounted to a shaft and located between the capstan flywheel having a geer portion and a connector gear. The shaft is moved up and down by mean of a slider lever which is interlocked with a clutch lever pivotally mounted by a pinch lever.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a video cassette recorder, and more particularly to an apparatus for transmitting the turning force of a capstan flywheel for video cassette recorders by which the turning force of the capstan flywheel driven by a capstan motor is transmitted to the reel disk selectively at high speed and low speed. 
     2. Description of the Prior Art 
     In the conventional video cassette recorders, as the turning force of the capstan flywheel is transmitted only by a belt without any distinction between high speed rotation for fast forward (FF) or rewind (REW) mode of the tape, and low speed rotation for play mode of the tape. This type of arrangement, however, has the disadvantage that the disadvantageous slip may occurr between the belt and the wheel, so that the loss of the turning force has occurred and thereby accuracy for transmitting the turning force is reduced. 
     Moreover, the above disadvantageous slip exerts a harmful influence upon the peripheral system, so that in practical use, it is very difficult to maintain the performance of the apparatus. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide an improvement in the apparatus of the above-described general type, such that the turning force of the capstan flywheel can be transmitted accurately by driving selectively at high speed and low speed respectively. 
     It is another object of the present invention to provide an improvement in the apparatus of the above type, such that when the reel disk is rotated at high speed, the turning force of the flywheel is to be rotated by way of the gear, so that the reduction of the turning force and the disadvantageous slip can be prevent. 
     It is still another object of the invention to provide an apparatus which is adapted to solve the difficulties on the selection of component parts by the accurate transmit of the turning force of the flywheel. 
     The above and other objects are achieved with an apparatus for transmitting the turning force of the capstan flywheel for video cassette recorders comprising a slider gear provided at its upper end with a clutch gear slidably mounted to a vertically moving shaft member and located between the capstan flywheel with the gear portion and a connector gear, the shaft member being moved up and down by means of a slider lever which is to be interlocked with a clutch lever pivotally mounted by a pinch lever. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will now be described by way of illutrative examples with reference to the accompanying drawings, in which: 
     FIG. 1 is a schematic plan view showing the embodiment according to the present invention; 
     FIG. 2 is a fragmentary sectional view taken along line A--A of FIG. 1; 
     FIG. 3A is a partially cutway view of the gear portion in the embodiment of FIG. 1; and 
     FIG. 3B is a schematic view of the portion for connecting the slider lever with the clutch lever of FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIG. 1 of the drawings, a capstan flywheel 3 is attached to a shaft in a deck and connected through a belt 22 in order to be rotated by means of a capstan motor. 
     To begin with, the turning force of the flywheel is transmitted to fixed connector gears 4 and 4&#39; or to a connector wheel 5. The turning force is transmitted from the connector gears 4 and 4&#39; or the connector wheel 5&#39; via fixed idlers 6 and 6&#39; to rotating idlers 7 and 7&#39;, and then transmitted to both of subreels 8 and 8&#39; respectively so that reel disks 9 and 9&#39; are rotated. 
     The wheel 3 is provided at its upper end with a gear portion 3&#39; while at its lower end with a pulley 3&#34; for fitting the idler belt. 
     A slider gear 11 is formed between the wheel 3 and the connector gears 4 and 4&#39;, and mounted slidably to a shaft 13 which is moved up and down by means of a slider lever 12 in order that the slider gear 11 and the slider lever 12 are moved up and down. 
     On the upper axial side of the slider gear 11, there is provided a clutch gear which is elastically connected to the slider gear by means of an elastic spring, the clutch gear 14 being slidably mounted to the shaft 13 to engage the connector gear 4, so that the gears 11 and 14 are rotated together. 
     By means of the slider lever 12, a lever pin 12&#39; engages with one end of a clutch lever 16 to be interlocked by the latter, the lever 16 being connected with an interlock pin via an elongated hole 16&#34; to enable rotation by a pinch lever 18 which is mounted in the deck 1, so that while a mode slider 17 is moved, the lever can be rotated. 
     In the embodiment as described above, since the connector gears 4 and 4&#39; and the upper and lower fixed idlers 6 and 6&#39; are attached slidably to the shaft and are to be ratated respectively. When the reel disk is intended to be rotated at high speed for fast forward (FF) and rewind (REW) modes of the tape, the slider gear 11 is lowered and engaged with the gear portion 3&#39; as shown in FIG. 2 and FIG. 3A. 
     At this moment, as the upper clutch gear is formed to be widened in its upper and lower width, the turning force of the wheel 13, which is rotated at high speed by means of the capstan motor 2, is transmitted to the connector gear 4 via the clutch gear 14 which is connected to the slider gear 11 by way of the gear portion 3&#39; and the slider gear 11, whereby the turning force is transmitted to the upper fixed idler 6 by means of the connector gear 4&#39; fixed therewith and thus rotates the upper rotating idler 7. 
     Accordingly, the rotating idler 7 is selectively contacted and engaged with the subreels 8 and 8&#39;. 
     More specifically, the rotating idler 7 engages with the subreel 8 during the rewind mode of the tape, while engages with the subreel 8&#39; during the fast forward mode, so that the corresponding reel disks 9 and 9&#39; are selectively rotated at high speed. 
     On the other hand, during the play mode of the tape, it is necessary to rotate the reel disk 9&#39; at low speed. At this time, a cam lever 21&#39; is rotated along the curved cam groove while the cam lever 21&#39; is rotated counter-clockwise, and thereby the mode slider 17 can be moved toward the right hand as the phantom line shown in FIG. 1. 
     In this manner, since the pinch lever 18 and the clutch lever 16 are rotated in turns as the phantom lines b and b&#39; shown in FIG. 1, one end 16&#39; of the clutch lever 16 pushes the lever pin 12&#39; along the arrow as shown in FIG. 3A. 
     Therefore, slider lever 12 is rotated as the phantom line C in FIG. 3, then the shaft 13 is moved upwardly by means of the shaft pin d, which is coupled with the elongated hole 16&#34;, so that the clutch gear 14 and the slider gear 11 attached thereto are moved upwardly together, and thus the slider gear 11 is separated from the capstan wheel 3. 
     The reduced turning force of the capstan flywheel 3 is transmitted to the connector wheel 5 by way of the idler belt 10 provided between the pulley 3&#34; and the connector wheel 5, and is then applied to the gear portion 3&#39; fixed to the connector wheel 5, causing the lower rotating idler 7&#39; to be rotated. 
     Accordingly, the lower rotating idler 7&#39; comes in contact with the subreel 8&#39; and engages therewith while rotating in accordance with its rotating direction so that the reel disk 9&#39; is rotated at low speed. Thus, the play mode is proceeded normally. Furthermore, when the reel disk 9&#39; is intended to be rotated again at high speed, the can gear 20 is reversely rotated, and thus the mode slider 17, the pinch lever 18, and the clutch lever 16 are moved inversely. Therefore, the slider gear 11 is lowered again and engaged with the gear portion 3&#39; of the capstan flywheel 3, so that the slider gear 11 is rotated at high speed. 
     According to the embodiment of the present invention as described above, the slider gear provided at its upper end with the clutch gear is slidably mounted to the shaft which is moved up and down by means of the slider lever provided between the capstan flywheel and the connector gear, in order to move vertically together with the shaft and thus the turning force is transmitted by the slider gear, resulting in that a disadvantageous slip is eliminated and the turnig force can be accurately transmitted with the loss thereof prevented. 
     While the present invention has been described and illustrated herein with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.