Patent GB-397485-A (GB)
Title: Paper reel control apparatus
IPC: B65H23/06
Filed: 1931-12-23
Abstract: 397,485. Feeding webs. JAMES, H. V., Cintra, Watford Road, Radlett, Hertfordshire. Dec. 23, 1931, No. 35571. [Class 100 (i).] The regulating switchgear described in Specification 125,813, [Class 100 (i), Feeding and delivering webs &c.], is operated through the intermediary of belts or the like bearing against the periphery of a web-supplying reel, such that the switch is moved from one extreme of its traverse to the other to alter the value of the electrical energy actuating the braking means, so that the retarding effort of the electrodynamically or electromagnetically operated brake is automatically varied from a predetermined maximum to a minimum value as the diameter of the reel decreases. In the arrangement shown in Fig. 1, the belts 1, which serve as the braking means, are carried by pulleys on a shaft 3 and, at maximum reel diameter, the belts are unwound so that the shaft 3 is rotated and thereby rotates, through chain gear 4, the arm 7 of the regulator 6 to the position shown in which the maximum braking is developed. The control apparatus comprises two electric motors 8, 9, each coupled to one element of a three - element epicyclic gear 10 whilst the third element is coupled to the shaft 3 ; at normal running a switch arm 15 contacts at A and the field current of the motor 9 is controlled by a hand-operated resistance 14, thereby regulating the braking action of the belts 1 as described in Specifications 352,190 and 369,485. When the press is to be slowed down, the arm 15 makes contact at B introducing into the motor circuit an adjustable resistance 16 and a resistance 18 in the regulator 6, which thus control the speed of the motor 9. As the reel diameter decreases, the arm 7 returns towards the chain line position, the belts 1 being rewound on to their pulleys, thereby increasing the resistance in the field circuit of the motor 9, so that the current flowing through the field coils is reduced with a corresponding reduction in the retarding effort of the belts, which is thus dependent upon the reel diameter and the pre-determined value of the resistance 16. At stoppage of the press, the arm 15 contacts at C and the retarding effort is determined by a resistance 20 and the reel diameter. In a modified form, each reel spindle is provided with an electromagneticallyenergized friction brake 23, Fig. 2. During normal running a switch arm 15 contacts at A whereby the brake solenoid 23<1> of the active reel is controlled by an adjustable resistance 14, a fixed resistance 191, and those parts of the resistances 18, 19 of the regulator 6 which are in circuit. The resistances 18, 19 are varied as before according to the reel diameter, the arm 7 being driven from the shaft carrying the pulleys 27, which is operated in one direction by a spring, weight, or the like and is allowed to return as the belts 24 wind up on the pulleys 27, when having their slack taken up. When the press is slowed down, arm 15 contacts at B, whereby the braking effort is determined by the resistance 16 and the reel diameter. At stoppage the arm 15 contacts at C and a resistance 20 is introduced in place of the resistance 16. The belts 28 which are anchored at 25 form backings at splice-up, and the belts controlling the regulator 6 may be used for a like purpose.