Patent GB-939836-A (GB)
Title: Web winding apparatus
IPC: B65H19/22
Filed: 1962-04-18
Abstract: 939,836. Winding webs. A. B. DICK CO. April 18; 1962 [April 20, 1961], No. 15073/62. Class 100 (1). [Also in Groups XXIV and XXXIV] Web winding apparatus 40 forms part of a label printing machine, Fig. 1 (not shown). A paper web 22 is fed continuously into the machine from unreeling and splicing apparatus described in Specification 939,835. The web having been printed is fed through a punching unit 36 of known construction, which forms the holes 24, Fig. 2, through a loop storage elevator 38 and over a guide roller 39 to the web winding apparatus 40, Fig. 3. The winding apparatus 40 comprises six winding spindles 42 mounted on a rotatable indexing wheel 44, so that each spindle successively takes up six separate positions 1-6. The web is wound on to the driven spindle at the No. 2 position whilst the No. 1 spindle acts as a pulley. When a web roll has been wound to a desired size, the web is severed by a severing unit 46 adjacent the No. 1 spindle. The leading end of the web is then wound around the No. 1 spindle and the wheel 44 is indexed through 60 degrees. Spindles; supporting, driving, construction of.-Figs. 5, 10, 17. A gear motor 102, Fig. 5, drives the shaft 100 of the indexing wheel 44 through 6 to 1 ratio meshing gears 116, 118. Each revolution of the gear motor 102 is controlled by a cam 122 on its shaft 104 actuating a switch 120, Fig. 7 (not shown). A motor 130, Fig. 5, supplies the drive to the spindle 42 through meshing gears 132, 134, 142, 144, 150, Fig. 17. Each spindle 42 is rotatably mounted on a hollow shaft 98, Fig. 10, rotatably mounted on the indexing wheel 44. The continuously rotating gear 150 is rotatably mounted on the shaft 98. The shaft 98 is driven at the Nos. 6, 1 and 2 positions, and braked in the Nos. 3, 4 and 5 positions by the operation of a brake and clutch mechanism 152 (see Groups XXIV and XXXIV). The shaft 98 drives the spindle 42 through an overrun clutch 96 of known construction. Suction is applied to the spindle by a vacuum pump 236 through the hollow spindle 98 and ducts 248, 246 so that the running web is held to the spindle after being severed. A removable core or sleeve 66 is retained on the spindle by a spring-loaded detent plunger 68 and is provided with suction openings 252, which co-operate with suction ducts 248. Tensioning.-Fig. 3. The speed of the gear motor 102 is controlled by the position of the downwardly biased movable rollers 298, 300 of the loop storage elevator 38. The speed and tension of the web is kept constant by the gradual reduction of speed of the motor 102 as the diameter of a roll increases. The No. 1 spindle, acting as a pulley, maintains a constant speed allowed by the overrun clutch 96. Severing, attaching leading end of the web to spindle.-Figs. 11 and 14. The operation of the severing mechanism 46 is normally initiated by a signal from the printer of the label printing machine. Firstly a solenoid 218 swings a pressure roller 210, Fig. 14, to press the web 22 against the No. 1 spindle. Secondly, a second solenoid 230 swings a knife 222 to sever the web, when the suction openings 252 of the spindle 42, Fig. 11, are adjacent the web. Immediately following the severing, the wheel 44 is indexed through 60 degrees. As a completed roll moves from the No. 2 to the No. 3 position it is braked by a spring-pressed lever 60, Fig. 3, engaging the periphery of the web roll. Detectors.-Figs. 11, 12, 13, 14, 18 and 20. To ensure the proper positioning of the suction openings 252 with relation to the severing of the web, the solenoid 230 is energized by the operation of a mercury type switch 260, Fig. 14, which in turn is operable by magnets 262, Fig. 11, mounted in a disc 264 secured to the rear end of the spindle 42 so as to rotate therewith. A detector roller 270, Figs. 12, 13, senses the diameter of the web roll and prevents it from exceeding a specific diameter when the severing signal fails. The roller 270 is mounted on arms 272 biased by a spring 276 against the roll. The arms are provided with three cams 278, 280 and 282 which operate corresponding switches 284, 286 and 288. The cams are staggered so that the switches will be operated successively as the arms 272 are swung outwardly. The switch 278 operates when the web roll diameter reaches a predetermined minimum size. Switches 286 and 288 operate when the web roll diameter reaches either of two predetermined maximum sizes. When the spindle reaches the No. 5 position, the machine is stopped unless a sleeve or core 66 has been mounted on the spindle and a fully wound web roll 25 removed. If the spindle 42 at the No. 5 position is bare, a spring-biased arm 74 pivoted at 76 and provided with a detecting roller 78, swings inwardly beyond its normal position and operates a switch 82, Fig. 18, which stops the machine. The inward movement of the arm 74 is limited by the action of a second arm 84, Fig. 20, pivoted at 76 for movement with the arm 74, and provided with a roller 86 which engages the periphery of the indexing wheel 44 formed with a notch 90 opposite each spindle 42. This arrangement prevents the machine from stopping when the wheel 44 is indexed. If a web roll 25 is still on a spindle at the No. 5 position the arm 74 will swing outwardly and operate a second stopping switch 94 and prevent the web roll from being indexed beyond this position.