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Speed Reducer

IP.com Disclosure Number: IPCOM000095910D
Original Publication Date: 1964-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Dollenmayer, WL: AUTHOR

Abstract

A speed reducer indicated at 1 is for a dictating machine drive. Magnetic belt 2, mounted on capstan 3, is driven from motor and clutch assembly 4 by reducer 1 that includes eccentric 5. Capstan 3 has end plugs 6 and 7. Motor and clutch assembly 4 is attached to shaft 8. Eccentric 5 is formed on the end of shaft 8. Eccentric 5 engages bearing 9 in the center of translating wheel 10. Wheel 10 is fixed to flexible rod 11 that has slotted shaft 12. Shaft 12 passes through end plug 6 and the slotted portion of shaft 12 mates with a similarly formed aperture 13 in frame 14.

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Speed Reducer

A speed reducer indicated at 1 is for a dictating machine drive. Magnetic belt 2, mounted on capstan 3, is driven from motor and clutch assembly 4 by reducer 1 that includes eccentric 5. Capstan 3 has end plugs 6 and 7. Motor and clutch assembly 4 is attached to shaft 8. Eccentric 5 is formed on the end of shaft 8. Eccentric 5 engages bearing 9 in the center of translating wheel 10. Wheel 10 is fixed to flexible rod 11 that has slotted shaft 12.

Shaft 12 passes through end plug 6 and the slotted portion of shaft 12 mates with a similarly formed aperture 13 in frame 14.

The lower drawing illustrates the method of obtaining speed reduction with the mechanism and shows the instantaneous relationship between the various components that exist at all instants of time.

The motor shaft, turning with a velocity of n(m) revolutions per minute, imparts a linear absolute velocity to the geometric center of the eccentric of v(1) = 2 Pi n(m)e in/sec, where e is the eccentricity measured between the geometric centers of the motor shaft (x-y axis) and the eccentric (x'-y axis).

Since the axis x'-y is also the geometric center of the translating wheel and since the translating wheel is not rotating with respect to an absolute coordinate system, the instantaneous absolute velocity of all points in the wheel is v(1).

Further, the instantaneous point of contact of the translating wheel with the inside diameter of the capstan is always along the y axis. The velocity vec...