Patent GB-403229-A (GB)
Title: Improvements in means for supply webs
IPC: B65H19/18
Filed: 1933-01-04
Abstract: 403,229. Feeding webs. SCOTT, W. C., 418, East Front Street, Plainfield, New Jersey, U.S.A. Jan. 4, 1933, No. 271. [Class 100 (i).] In a web-supplying device of the kind having a plurality of web rolls supported on rotatable coreengaging means mounted on a rotatable reel, one of the webs being active, and in which the reel is rotated to bring a replenishing roll into feeding position so that its web may be joined to that of the active roll, there is provided actuating means carried by the reel adapted to rotate the replenishing roll and having controlling means responsive to the tension of the active web to render the actuating means operative when the strain on the united webs increases beyond a certain point. The active roll 2 and the replenishing rolls 3, 6 are carried by a reel 4 rotatably mounted on a shaft 5. The actuating means may comprise electric motors 9 carried by the reel 4 adjacent each roll and each driving its appropriate roll through a worm 10 and a gear 11 on the roll spindle. Two stationary contact sectors 12 on the shaft 5 are connected to a battery 13, and two brushes 14 engage these contacts when a roll such as the roll 3 is moving into feeding position, and an additional controlling contact is provided responsive to the tension of the web 7. This comprises a member 15 movably mounted on a pivot 16 and carrying a roller 17 round which the web passes, and which is urged downwards by a spring &c. One wire of the circuit of the motor 9 is connected to the arm 15 and the other to a contact 19, so that when the tension of the web increases due to the pull thereon of the replenishing roll, the motor circuit is closed and the replenishing roll is rotated about its axis until the rotation of the reel brings the roll to its final feeding position, when the brushes move off the contact sectors 12 and the circuit of the motor 9 is broken. The sectors 12 may be of greater length, so that the brushes engage therewith when the roll is in its final feeding position, in which case the motor 9 serves as a boosting motor to prevent the web tension becoming excessive. Brake mechanism 20 is provided and is controlled by the roller 17 through a roller 15g carried by the arm 15, which acts upon a pivoted spring-held lever 15e connected to the brake mechanism on the active roll by a rod 15i. An adjustable counterweight 15b and a dash-pot 15c are provided. The brake mechanism is adjusted to correct slackness of the web and the motor 9 serves to correct excessive tension. In a modification, the replenishing roll as it moves into contact with the active web raises a switch member in the form of an arm pivoted at one end to the machine frame and carrying at its other end a roller which rests on the web, and the arm when raised closes a contact in the circuit of the motor 9. In another modification, the web of the replenishing roll is placed on a pasting device and is raised by hand into contact with the active web, this movement closing a contact in the circuit of the motor 9. In both arrangements, the circuit also includes the additional contact device 15. In an all-mechanical equivalent, shown in Fig. 5, a bevel gear 28 is carried by the support 4 and this meshes with a plurality of bevel pinions 29, one for each roll. Each pinion is connected by a shaft 30 to a pinion 31 meshing with a bevel gear 32 on the roll. On each shaft 30 is a clutch 33 urged into its closed position by a spring 34 and opened by a cam 35, which is fast on the shaft 5 and is preferably so shaped that only the clutch of the roll moving into feeding position is closed. The gear 28 is driven from a shaft 36 which is driven through a clutch 36a controlled by the tension-regulating device 15.