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Paper Tape Feed Indexing Mechanism

IP.com Disclosure Number: IPCOM000075955D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Pratt, WW: AUTHOR [+2]

Abstract

Described is a mechanism which is capable of providing rotary motion in a single direction, from both the forward and reverse motion of an electromagnet armature. The rotary motion is obtained by pulsing a drive magnet and utilizing the return motion by a loaded spring. The drive magnet 9 is pulsed causing armature 8 to rotate about its pivot in a counterclockwise direction. When the armature is sealed, the pawl carrier 7 is moved to the left and spring 10 is moved to a loaded position. As the carrier moves to the left, a drive pawl 5 rotates the index ratchet a distance equal to one half of a ratchet tooth. Due to the motion of the pawl carrier and the ratchet wheel, a drive pawl 6 falls behind ratchet tooth A in a position to rotate the ratchet wheel in the same direction one-half tooth on the return stroke.

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Paper Tape Feed Indexing Mechanism

Described is a mechanism which is capable of providing rotary motion in a single direction, from both the forward and reverse motion of an electromagnet armature. The rotary motion is obtained by pulsing a drive magnet and utilizing the return motion by a loaded spring. The drive magnet 9 is pulsed causing armature 8 to rotate about its pivot in a counterclockwise direction. When the armature is sealed, the pawl carrier 7 is moved to the left and spring 10 is moved to a loaded position. As the carrier moves to the left, a drive pawl 5 rotates the index ratchet a distance equal to one half of a ratchet tooth. Due to the motion of the pawl carrier and the ratchet wheel, a drive pawl 6 falls behind ratchet tooth A in a position to rotate the ratchet wheel in the same direction one-half tooth on the return stroke. Power for the return stroke is provided by loaded spring 10. On the return stroke, armature 8 is returned to its normal position where it is ready for the next indexing cycle.

Both the forward and the reverse motion of the armature equals one complete tooth rotation of the index ratchet. The ratchet wheel and the paper feed rolls are fastened rigidly to the drive shaft. A one-tooth rotation to the ratchet wheel equals one print-line space at the paper path. Drive pawls 5 and 6 are spring loaded which causes them to follow the ratchet tooth surfaces. Stops 11 and 12 are provided to limit the carrier travel in both the forwa...