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Force Evening Spring Mechanism for Unrolling Strip Stock

IP.com Disclosure Number: IPCOM000080187D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Luecke, FS: AUTHOR

Abstract

This spring mechanism 10 is effective on a strip 12 of sheet material being unrolled from a supply roll 14. This mechanism comprises sheet material spring 16 and wire grasshopper spring 18, which is effective on the end of spring 16 for causing spring force from spring 16 on strip 12 to increase more slowly as spring 16 is deflected greater amounts by strip 12.

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Force Evening Spring Mechanism for Unrolling Strip Stock

This spring mechanism 10 is effective on a strip 12 of sheet material being unrolled from a supply roll 14. This mechanism comprises sheet material spring 16 and wire grasshopper spring 18, which is effective on the end of spring 16 for causing spring force from spring 16 on strip 12 to increase more slowly as spring 16 is deflected greater amounts by strip 12.

Reel 14 is a free-wheeling supply reel on which strip 12 is rolled, being rotatably mounted about center 14a. Strip 12 is drawn across spring mechanism 10 from reel 14 by feed rolls 20 and 22. Spring 16 has its upper end 16a molded into a stationary part 24 leaving its lower end 16b free to swing toward rolls 20 and 22, under the action of strip 12 as it is being unrolled from reel 14. Grasshopper spring 18 comprises a pair of upper arms 18a and 18b, a pair of helical portions 18c and 18d, and a pair of lower arms 18e and 18f connected by a connecting portion 18g. The ends of arms 18a and 18b are looped about a stationary pin 26, and connecting portion 18g extends through a plastic tube 28 about which the end 16b of spring 16 is looped.

Both springs 16 and 18 are shown in full lines in their unflexed positions. As strip 12 is initially drawn by rolls 20 and 22 over spring mechanism 10 from supply reel 14, spring 16 is flexed with its lower end 16b moving toward rolls 20 and 22 against the resilient action of spring 16; and, likewise, grasshopper spring 18 and particularly its helical-wound portions 18c and 18d are flexed, with spring portion 18g moving toward pin 26 and with spring 18 during this flexing action pivoting about pin 26. Thus, during this initial movement of springs 16 and 18, both springs 16 and 18 (spring 16 a...