Browse Prior Art Database

Encapsulated and Joined Inserts for a Tip Element

IP.com Disclosure Number: IPCOM000086586D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 37K

Publishing Venue

IBM

Related People

Johnson, OD: AUTHOR [+2]

Abstract

As taught partially in U.S. Patent 3,968,959, in one type of tip for an intermittent motion imparting device (IMBED), the elliptical motion produced at the free end of the tip is generated by the combination of axial and torsional driving motions at the base of the tip. The orientation and shape of this elliptical motion is influenced by the amplitude of and phase relationship between the motion inputs, by the physical properties of the elastomer material of which the tip is made, by the length and rotary inertia of the cross-section of the tip, and by the frequency at which the tip is driven. With this type of tip, the amplitude of the torsional driving motion and its phase relationship to the axial motion is controlled chiefly by the stiffness and degree of damping of the joint between the tip shaft and tip spring.

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Encapsulated and Joined Inserts for a Tip Element

As taught partially in U.S. Patent 3,968,959, in one type of tip for an intermittent motion imparting device (IMBED), the elliptical motion produced at the free end of the tip is generated by the combination of axial and torsional driving motions at the base of the tip. The orientation and shape of this elliptical motion is influenced by the amplitude of and phase relationship between the motion inputs, by the physical properties of the elastomer material of which the tip is made, by the length and rotary inertia of the cross-section of the tip, and by the frequency at which the tip is driven. With this type of tip, the amplitude of the torsional driving motion and its phase relationship to the axial motion is controlled chiefly by the stiffness and degree of damping of the joint between the tip shaft and tip spring. If the elastomer's attachment to the tip shaft is stiff relative to the elastomer's attachment to the tip leaf spring, only a small amount of torsional driving motion is produced and very little lateral motion of the tip occurs. If the elastomer's attachment to the tip shaft is weak relative to its attachment to the spring, then a large torsional motion is produced and the tip can undergo large lateral excursions.

ln IMID tips where there is no physical contact between the spring and shaft, stiffness of the joint, created by molding these parts into the elastomer material, is very sensitive to changes in the elastomer properties and the tolerances and positioning of the spring and shaft. The joint and spring illustrated above, greatly reduce the sensitivity to material and part tolerances, and eliminate the positioning problem. These features make IMID tips easier to manufacture and more uniform in performance, and provide more easily controllable parameters for changing tip performance.

As shown in Fig. 1, the joint consists of joining the spring and shaft mechanically before encap...