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Browse Prior Art Database

Half Space and Full Space Mechanism

IP.com Disclosure Number: IPCOM000095139D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Dollenmayer, WL: AUTHOR

Abstract

The mechanism supplies either a half space movement of a magnetic head with respect to a record media or a full space movement, as required. In a, magnetic head 1 scans belt 2 for recording and reproducing signals. Head 1 is mounted on head carrier 3 adjacent leadscrew 4 that is threaded with a predetermined pitch such as 40 threads per inch. Carrier 3 is engaged with leadscrew 4 by rocker arm 5 having pawl extensions 5a and 5b. The latter are positioned a predetermined distance apart that corresponds to n + 1/2 teeth where n is an integer number of teeth on leadscrew 4. Rotation of leadscrew 4 imparts lateral movement of head 1 to the right, forward, or the left, reverse. Backspace solenoid 6 has armature 7 positioned adjacent extension 5c of arm 5 for actuating 5.

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Half Space and Full Space Mechanism

The mechanism supplies either a half space movement of a magnetic head with respect to a record media or a full space movement, as required. In a, magnetic head 1 scans belt 2 for recording and reproducing signals. Head 1 is mounted on head carrier 3 adjacent leadscrew 4 that is threaded with a predetermined pitch such as 40 threads per inch. Carrier 3 is engaged with leadscrew 4 by rocker arm 5 having pawl extensions 5a and 5b. The latter are positioned a predetermined distance apart that corresponds to n + 1/2 teeth where n is an integer number of teeth on leadscrew 4. Rotation of leadscrew 4 imparts lateral movement of head 1 to the right, forward, or the left, reverse. Backspace solenoid 6 has armature 7 positioned adjacent extension 5c of arm 5 for actuating 5. Coil spring 8 is attached at 9 to carrier 3 and maintains a constant tension to the left on carrier 3.

The normal position of arm 5 is shown in b with extension 5a engaged with leadscrew 4. A half space operation is performed by energizing solenoid 6. This disengages extension 5a of arm 5 from leadscrew 4 and engages extension 5b of arm 5 as in c. During the rocking of arm 5, spring 8 pulls the assembly to the left so that extension 5b engages leadscrew 4 one half tooth to the left which is equal to a half space on belt 2. Solenoid 6 is maintained energized so that extension 5b remains engaged with leadscrew 4. When solenoid 6 is de- energized, arm 5 rocks again to...