Carrier with thumb wind tape advance for videocassette

Abstract: A carrier for use with a magnetic tape cartridge is disclosed. The carrier includes a manual advance mechanism to advance the tape media onto the take-up reel located within the tape carrier.

Description: The present invention relates to magnetic tape cartridges and carriers for use in videotape machines. The tape cartridge is inserted into a carrier which adapts the cartridge to a standard videocassette format. Most home videotape machines use magnetic recording media supplied in the VHS videocassette format. The typical videocassette has a housing containing both a supply reel and a take-up reel. The magnetic tape is attached to the hubs of the two reels. The housing has several guide posts which cooperate to define the tape path for the videocassette. The tape path is protected by a door which is closed when the videocassette is outside of the machine. When the videocassette is inserted into the machine the tape transport mechanisms open the door to permit the magnetic media to engage the rotating heads of the machine. Although the traditional VHS format is popular it is not an efficient format for the storage of tape. The videocassette format includes an empty take up reel within the housing which reduces the density of information storage. The present invention addresses this problem with a single reel tape cartridge which does not include an empty reel. This cartridge may be inserted into a cooperating carrier. The carrier accepts the cartridge and adapts the cartridge to the VHS format. Such a two-piece videocassette is disclosed in EP-A- 0 398 671, state of the art by virtue of Article 54(3) EPC. SUMMARY OF THE INVENTION According to the present invention there is provided a two-piece videocassette having a tape cartridge, a supply reel located in said cartridge and having a gear flange for rotating said supply reel; a carrier adapted to receive said tape cartridge; a take-up reel located in said carrier, adapted for rotation within said carrier and having a gear flange for rotating said take-up reel; a drive gear ring adapted for manual actuation; a clapper gear mounted on a control arm; transfer gear means connected to said drive gear ring for coupling torque from said drive gear ring to said clapper gear and for transferring torque to said control arm, whereby said clapper gear is rotated into engagement with either of said gear flanges depending on the sense of rotation of said drive ring; said control arm coupled to said clapper gear to limit clapper gear travel; an idler gear located between said drive gear ring and said transfer gear means which matches tape movement direction with winding direction. Optional features of the invention are set out in claims 2 and 3 below. In the embodiment described, there is a specialised winding mechanism which is incorporated in the carrier portion of the two-piece videocassette. This mechanism is used to couple the tape on the supply reel to the takeup reel. The tape cartridge includes a supply of tape which terminates in a tape connector. This tape connector is coupled to a tether connector located within the carrier. The tether connector is connected to a leader or tether which is connected to the take-up reel located in the carrier. The insertion of the cartridge into the carrier completes the tape-tether interconnection. Once the cartridge is fully inserted into the carrier the operator will manually advance the interconnection to the take up reel to prepare the carrier for insertion into the videocassette machine. This operation is performed by the specialized winging mechanism. The winding mechanism is manually operated through a thumb key. The thumb key is attached to a gear train which rotates a clapper gear into engagement with either the take up reel or the supply reel depending on the direction of key rotation. By turning the thumb key, the tape-tether interconnection may be move from one side of the carrier to the other. Once the tape-tether interconnection is advanced onto the take up reel the videocassette may be safely inserted into the videocassette machine. BRIEF DESCRIPTION OF THE DRAWING In the drawing, in which like reference numerals indicate corresponding structures throughout the views: FIG. 1 is a perspective view of the carrier and the cartridge; FIG. 2 is a perspective view of the cartridge inserted into the carrier; FIG. 3A is a top view of assembly with the tape-tether interconnection located near the supply reel; FIG. 3B is a top view of the assembly with the tape-tether interconnection advanced to the take-up reel; FIG. 4A is a top view of the carrier; FIG. 4B is a side elevation of the carrier; FIG. 4C is a side elevation of the carrier; FIG. 5 is a perspective view of the carrier gear train. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the following detailed description of the preferred embodiment, reference is made to an illustrative embodiment of the invention. FIG. 1 depicts a cartridge 14 for insertion into a carrier 12. The insertion sequence begins by engaging ledge 34 of the cartridge with the cross support 36 of the carrier. Next, the cartridge is rotated into the home position depicted in FIG. 2. This insertion process causes a tape connector associated with the cartridge to engage a tether connector associated with a take-up reel. This tape-tether interconnection is show in phantom view as 16 in FIG. 3A and FIG.3B. The interconnection sequence is more fully described in commonly assigned, incorporated references. A manually operated mechanism is provided in the carrier to advance the tape-tether interconnection 16 from the "home position" (FIG 3A) on the supply reel side of the carrier to the "play position" (FIG.3B) on the take-up reel side of the carrier. It is preferred to operate this mechanism through a collapsible thumb key 22. In FIG. 1 the key is shown in the collapsed position while FIG.2 depicts the key in the operating position. In operation, the user will insert the cartridge into the carrier and then operate the thumb key to advance the interconnection 16 from the supply reel side to the take-up reel side of the carrier. Once the interconnection is on the take-up reel, the cartridge-carrier assembly may be introduced into the videocassette machine. To remove the cartridge, the cartridge-carrier assembly 10 is removed from the videocassette machine at the end of the rewind cycle. The rewind cycle leaves the interconnection on the take-up side of the carrier in the "play position". The user then elevates the thumb key 22 and rewinds the tape-tether interconnection 16 to the "home position" depicted in FIG. 3A. Once the interconnection is in the home position, thumb pressure through the aperture 45 will permit the user to rotate the cartridge out of the carrier. The thumb key 22 can apply torque to either the supply reel 19 or the take up reel 20. As shown in FIG. 3A and FIG. 4A the lower flange of the supply reel is a gear 21 while the lower flange of the take-up reel 20 is a gear 24. The clapper gear 25 engages either the supply gear 21 or the take-up gear 24 depending on the direction of thumb key rotation. Power from the thumb key is transmitted through a gear train which includes a thumb key ring gear 23. The ring gear engages an idle gear 26 shown in FIG. 4A and 4B, which insures that clockwise rotation of the key advances the interconnection toward the take-up reel and that counterclockwise rotation of the key rewinds the interconnector toward the home position. Power from the idler gear is transmitted to a pair of transfer gears 27 and 28. The upper transfer gear 27 engages the idle gear 26. This transfer gear 27 is attached the lower transfer gear 28 through a mating D shaft spline. The clapper gear 25 is mounted on an arm 29 which may pivot around the axis of the transfer gear assembly. This arm limits the rotational movement of the clapper gear (25) so as to limit tooth engagement and load. Rotation about this pivot will cause the clapper gear to engage either the supply gear 21 or the take up gear 24. A small amount of drag between the transfer gear assembly and the arm is required to apply torque to the arm 29 to cause it to rotate. This torque may be supplied by a wave washer 30 placed between the lower edge of the upper transfer gear and the arm. In operation the user may advance or rewind tape through the key activated clapper gear. However once the carrier has been inserted into the videotape machine the tape transport will insert a pin into the aperture 31 formed in the carrier as seen in fIg. 4C. The pin, which is not shown, contacts the conical interior surface of the clapper gear 25 and disengages it from the reel gear. This illustrative embodiment provides a convenient and effective method of preparing the carrier for insertion into a videocassette machine.

Claims: A two-piece videocassette having a tape cartridge (14); a supply reel located in said cartridge and having a gear flange (21) for rotating said supply reel; a carrier (12) adapted to receive said tape cartridge (14); a take-up reel (20) located in said carrier, adapted for rotation within said carrier, and having a gear flange (24) for rotating said take-up reel; a drive gear ring (23) adapted for manual actuation; a clapper gear (25) mounted on a control arm (29); transfer gear means (27) connected to said drive gear ring (23) for coupling torque from said drive gear ring (23) to said clapper gear and for transferring torque to said control arm, whereby said clapper gear is rotated into engagement with either of said gear flanges (21,24) depending on the sense of rotation of said drive ring; said control arm (29) coupled to said clapper gear (25) to limit clapper gear (25) travel; an idler gear (26) located between said drive gear ring (23) and said transfer gear means (27) which matches tape movement direction with winding direction. The videocassette of claim 1 wherein said control arm (29) is mounted for pivotal motion about a point concentric with the center of said transfer gear means (27, 28), the clapper gear (25) is rotatably mounted on said control arm (29) and meshed with a transfer gear (28) of said transfer gear means; and said transfer gear means further comprises:- drag means (30) for transferring torque from said transfer gear (27) to said idler gear (26) whereby rotation said transfer gear (27) causes said clapper gear (25) to rotate into engagement with said gear flange. The videocassette of claim 2 wherein said drag means comprises: a wave washer (30) located between a transfer gear (27,28) of said transfer gear means and said control arm (29).

Inventors: TURGEON THOMAS A C O MINNESOTA, TURGEON, THOMAS A., C/O MINNESOTA MINING AND
Applicants: MINNESOTA MINING & MFG, MINNESOTA MINING AND MANUFACTURING COMPANY
Application year: 1990
Main classification: G11B23
IPC codes: G11B23, G11B15, G11B25