Dynamic magnetic information storage or retrieval – Head – Head accessory
Patent
1991-01-07
1993-09-07
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Head accessory
360137, G11B 541
Patent
active
052434842
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cleaning cassette for cassette tape recorders comprising a cleaning member which upon placing the cassette in the tape recorder is brought into engagement with its recording/reproducing head and which is subjected to a reciprocating cleaning movement across the recording head by means of a pivot arm, one end of which is pivotal about a stationary axis while the other end is connected with the cleaning member, said pivot arm having a slot engaging an eccentric head connected through a transmission device with hub means for engagement with respective ones of the coil drive shafts of the tape recorder in such a manner that the cleaning member by rotation of an arbitrary one of the coil drive shafts of the tape recorder is subjected to said cleaning movement.
From DK patent No. 151,656 such a cleaning cassette is known in which the cleaning member is connected to both coil drives of the cassette by means of a gear-wheel arrangement including pinions communicating with respective coil drives and engaging an idle wheel connected with an eccentric cam device actuating a pivot arm with which the cleaning member is connected.
This design provides for obtaining a correct cleaning function irrespective of the orientation of the cleaning cassette when positioned in the tape recorder, but the transmission device suffers from the drawback that it establishes a direct driving connection from the first hub means to the second hub means of the cassette, thereby causing the motor of the tape recorder to perform, through the active coil drive shaft, not only the necessary motive power for the cleaning cassette but also a sufficient motive power for the indispensable co-rotation of the second coil drive shaft of the tape recorder and the transmission devices connected therewith.
In a device disclosed in EP patent No. 0,144,364 this drawback has been eliminated in that the reciprocating movement of the cleaning member is provided by means of a spring-biassed pivot arm actuated by a cam device connected with one of the hub means, while a second pivot arm is positioned between a holder for the cleaning member and a cam device connected with the second hub means in such a manner that the second pivot arm which is not directly connected with the holder of the cleaning member by engagement between the second hub means and the effective coil drive shaft of the tape recorder may impart a forward movement to the cleaning member against the spring bias force exerted on the first pivot arm, while the return movement is solely effected by the spring bias force.
Thereby a direct drive connection from the first to the second hub means of the cassette is avoided, but the design of the transmission device with two separate pivot arms in connection with the respective coil drives and a spring bias force acting solely on one of the pivot arms involves a comparatively work consuming mounting and thus also increases the production price of the cleaning cassette.
The object of the invention is to provide a cleaning cassette of the type concerned in which the functional advantage of the latter of the above mentioned known designs is maintained concurrently with obtaining a simpler mounting and a more sturdy design of the transmission device, thereby further compensating more easily for productional tolerances in the drive arrangement of the tape recorder.
This is obtained according to the invention in that the transmission device includes a first and a second pinion communicating with respective ones of said hub means, said first pinion being directly connected with a first transmission gear wheel and said second pinion being connected with a second transmission gear wheel via an idle wheel, which first and second transmission gear wheels are mutually independently rotatable about a common axis and which via their respective one-way coupling devices having the same coupling direction are connected with the same shaft pin rotatable about said common axis and carrying the eccentric head.
The invention will now be e
REFERENCES:
patent: 4272796 (1981-06-01), Van Kreuningen et al.
patent: 4594629 (1986-06-01), d'Arc
Moesgaard Anders
Moller Helge
Am Kemi A/S
Wolff John H.
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