Appeal No. 2002-1053 Page 13
Application No. 09/702,981
web. The roll 11 is carried by two boxes 12 which are mounted to slide in stationary
guides 13, up to a stop screw 14. The web tends to pull these boxes away from this
stop screw, and springs 15 are used for resisting the pull of the web and holding the roll
under spring tension to properly tension the web. These springs are seated at the
opposite end in another pair of boxes 16 which also can slide in the guides. These
boxes are held in adjusted position by screws 17.
The springs alone will not hold the tension roll 11 in perfect alignment. To
prevent their moving independently of each other, Wood provides each of the roll
carrying boxes 12 with a rack 18 permanently and fixedly secured thereto. With each
rack a pinion 19 meshes, and each of these pinions is secured on a cross shaft 20
which is free to turn. Therefore, it will be seen that both ends of the roll are obliged to
move equal distances, and the roll cannot get out of alignment after it is once properly
lined up by the adjustment of the boxes 16.
Wood teaches that due to the unevenness of the paper rolls it has occasionally
been found that the tension roll must be deliberately thrown out of alignment. For this
purpose the pinions 19 and racks 18 are provided with angular teeth cut of opposite
hands. Therefore when the shaft 20 is moved in an axial direction one rack will be
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Last modified: November 3, 2007