Abstract In a dispenser for a web of flexible sheet material, such dispenser having a chassis and a rotatable feed roller for feeding the web material out of the dispenser, such roller having a member mounted adjacent one end with such member having a cam follower eccentrically mounted thereon, a drive spring comprising an intermediate portion anchored to the dispenser chassis and first and second outwardly extending portions integrally affixed to opposite ends of such intermediate portion. The first outwardly extending portion abuts a portion of the dispenser chassis. The second outwardly extending portion cooperates with the cam follower for deflection thereby during rotation of the feed roller and provides a decreasing moment against rotation of the feed roller while maintaining substantially constant deflection of the spring during a portion of the feed roller rotation.
Inventors
👤 P Jespersen
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 17:14
CPC Classifications
B; B65; B65H; B65H35/00; B65H35/0006; B65H35/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In a dispenser for flexible sheet material, said dispenser having a chassis and a rotatable feed roller for feeding said material out of the dispenser, said feed roller having a member mounted adjacent one end thereof, said member having a cam follower eccentrically mounted thereon, a drive spring comprising: an intermediate portion anchored to said chassis; a first outwardly extending portion integrally affixed to one end of said intermediate portion and abutting a portion of said chassis; and a second outwardly extending portion integrally affixed to the opposite end of said intermediate portion and cooperating with said cam follower for deflection thereby during rotation of said feed roller and member, said second portion being configured to provide a decreasing moment against rotation of said feed roller while maintaining substantially constant deflection during a portion of said feed roller rotation.
Claim 2
Dependent Claim
139 words
In a dispenser for flexible sheet material, said dispenser having a chassis and a rotatable feed roller for feeding said material out of the dispenser, said feed roller having a member mounted adjacent one end thereof, said member having a cam follower eccentrically mounted thereon, a drive spring comprising: an intermediate portion anchored to said chassis; a first outwardly extending portion integrally affixed to one end of said intermediate portion and abutting a portion of said chassis; and a second outwardly extending portion integrally affixed to the opposite end of said intermediate portion and cooperating with said cam follower for deflection thereby during rotation of said feed roller and member, said second portion being configured to provide a decreasing moment against rotation of said feed roller while maintaining substantially constant deflection during a portion of said feed roller rotation.
Claim 3
Dependent Claim
70 words
A drive spring according to claim 1, wherein said second outwardly extending portion comprises a first section adjacent said intermediate portion and a second section remote from said intermediate portion, said second section defining an arc of substantially constant radius with said radius generally equal to the radial displacement of the radially outer surface of said cam follower from the axis of rotation of said feed roller and said member.
Claim 4
Dependent Claim
19 words
A drive spring according to claim 2, wherein said first section of said second outwardly extending portion is linear.
Claim 5
Dependent Claim
14 words
A drive spring according to claim 1, wherein said intermediate portion comprises a coil.
Claim 6
Dependent Claim
17 words
A drive spring according to claim 4, wherein said outwardly extending portions extend tangentially of said coil.