November 1. 1913.1 



THE INDIA RUBBER WORLD 



93 



New Machines and Appliances. 



KEYSTONE RUBBER SLITTER AND REWINDER. 



/~\NE of ilic iifwcr types of ni'ilicr-slitting machines is sliown 

 ^^ in the accompanying illustration. This apparatus, which is 

 known as the Keystone, is designed for cutting narrow widths 

 of material from wide rolls and rewinding these smaller rolls in 

 the one operation. It has found a \i ide use in slitting rubber in 

 various forms, as well as for cutting cloth for insulation purposes. 

 As seen in the illustration, the rewinding shafts are driven by 

 a chain and sprocket instead of liy a leather belt, in order to 

 eliminate slipping. For the purpose of maintaining a uniform 

 tension on the rewinding bar, a slipping friction is provided. 

 This causes the rolls to be wciund with a uniform hardness 

 which, however, is variable by means of an adjustment of the 

 rewinding tension. The cutting knives are ground in a slightly 

 cupped shape so that they will remain sharp as long as possible. 

 The macliinc is equipped with special thrust collars which pro- 

 vide a means of taking up any wear in the ends of the knife 

 shafts. This keeps the cutting edges close to.gether and makes 

 regrinding less frequent. A single set screw Imlds each cutter 

 in position and each knife can. thercfnre. be set very quickly for 



Keystone Slitting .and Rewinding Machine. 



the diflferent widths to be cut. Special cutters are made to cut 

 strips as narrow as three-eighths of an inch. 



There is provided a sliding rule which swings down 

 to the knives and results in a great saving of time when 

 setting the machine for different sizes of work. The re- 

 winding bars, which must be taken out each time a full-size roll 

 has been rewound, are held in their bearings by means of an 

 aatomatic latch cap, the mere lifting or lowering of which re- 

 leases the roll or locks it in place. [Charles Beck Co., 609 Chest- 

 nut street, Philadelphia, Pennsylvania.] 



AUTOMATIC 



MACHINE 

 MATIC 



FOR BUILDING 

 TIRES. 



PNEU- 



T T NTIL a comparatively short time ago motor vehicle tires 

 ^^ were built up by the slow and uncertain method of laying 

 on the fabric and rubber by hand, this process often resulting in 

 unevenly-stretched layers. Recently, however, a number of ma- 

 chines have appeared on the market for accomplishing this work 

 automatically. One of these, the subject of a recent United 

 States patent, is briefly described herewith. 



Referring to the drawing, A shows the base of the machine 

 frame, B the roll-carrying head, C the core ovi:r which the tire is 

 built u]). and D a pivoted arm which carries various tools for 

 linishing the tire during the building process. The core C is 

 fastened to the stub shaft H, mounted on a bracket /'. and is actu- 



AuT0.\i.\Tic Tire Building M.\chine. 



ated by a set of bevel gears (behind the core and not seen in 

 the drawing) through the spur gears G and H. This set of gears 

 is mounted on the tubular shaft K, which carries a change speed 

 gear set. By means of the worm L and the gear M attached to 

 the shaft .V, the core C may be made to assume any position 

 from the horizontal to the vertical. 



The head B carries a roll of friction cloth, layers of which 

 are stretched and laid on the core C as the first step in the con- 

 struction of a tire. This friction fabric is wound on a strip of 

 ordinary cloth in order to separate the layers as they are rolled 

 up and to prevent them from adhering. One of these rolls is 

 indicated at O, while P shows a roll on which the protecting 

 cloth is wound as the friction cloth is unwound, the weight of the 

 roll P being sufficient to drive it as it rests against the periphery 

 of the roll O. The drawing shows a strip of material passing 

 over the stretching and guiding rolls Q and R and the brake 

 roller S, and being wound on the core. As the fabric is wound 

 on the core it is stretched lengthwise by means of this brake 

 roller. It is absolutely essential that the fabric be laid on the 

 core evenly and that their center lines coincide. It often occurs 

 that the fabric is not wound evenly on the roll O, and as a result 

 it will not wind truly on the core unless some means is provided 

 to overcome the difficulty. To accomplish this result the heaJ 



