498 



THE INDIA RUBBER WORLD 



.\PRIL 1, 1921 



New Machines and Appliances 



PNEUMATIC TUBE STEAM SPLICER 



IT IS estimated tliat 95 per cent of inner tubes are spliced by the 

 well-known cold cure or acid method. This is due to the 

 fact that steam cure methods generally are not economical in 

 labor cost, although more rehaible in effect and eliminate all of 

 the serious objections incident to the cold-cure method. A 

 successful pneumatic steam tube splicer recently perfected is 

 shown in the illustrations. Fig. 1 is a sectional view showing 

 method of holding the inner tube and clamping the joint for 

 steam cure. The clamp contains an inflatable air bag for exert- 

 ing pressure on the joint under cure by the circulation of steam 

 in the annular space A. Fig. 2 is a cross-section through the 

 clamp and tube, showing the arrangement of the air bag, steam 



>hown. It consists of a corrugated roll wash mill and a mixing 

 mill. 



The mills and motor drive arc mounted on a single continuous 

 lied-plate for greater rigidity. The gears are all machine cut and 



Ix.NER Tube Ste.\m Splicer. 



space A and tube B 

 during the curing opera- 

 tion. 



It is claimed that the 

 splice need not exceed 

 from one-half to one 

 inch in length, thus 

 saving stock and ma- 

 terial. There is no over- 

 cure of the rubber at the 

 splice. The speed of 

 operation of this method 

 exceeds that of the acid 

 cure. An important 

 saving is effected in the matter of wrappers and by the elimina- 

 tion of acid fumes safe working conditions are secured as regards 

 the health of the employes. — The Pneumatic Tube Steam Splicer 

 Co., Baltimore, Maryland. 



THE YARWAY SEATLESS BLOW-OFF VALVE 

 Very ingenious is the celluloid sliding model of the Yarway 

 seatless blow-off valve, made by the Yarnall-Waring Co., Chestnut 

 Hill, Philadelphia, Pennsylvania. The valve is of the seatless 

 hollow piston type, without any projection upon which scale or 

 sediment can accumulate. The pressure is against the side of the 

 piston when the valve is closed, and means are provided for 

 setting up the packing when the valve is under pressure. There 

 is also visual indication of the location of the plunger in the body 

 at all times. The packing is automatically compressed when 

 closing the valve, and reinains stationary, being protected from 

 the blast of the blow down. 



Laboratory Mills 



c-ither machine is operated by independent clutch connections.- 

 The Banner Machine Co., Columbiana, Ohio. 



EXPERIMENTAL RUBBER MACHINERY 



A very useful combination of rubber-making machinery de- 

 signed f' r laboratory and experimental purposes is herewith 



MACHINE FOR WRAPPING COILS OF WIRE 



Small or medium sized coils of either insulated or bare wire 

 are quickly wrapped with this machine. The open-gap type 

 shuttle carries sufficient paper to wrap from 12 to 20 coils, de- 

 pending on their size. The paper plays out at one end through 

 a tension de- 

 vice and an 

 edge folder 

 applies it 

 with the 

 edge turned 

 under. At 

 the same 

 time a strip 

 of gummed 

 tape is also 

 applied. This 

 s t r engthens 

 the wrapping 

 and prevents 

 the layers 

 from slip- 

 ping. 



A set oi 

 gear chains , 

 i s provided ^ '^ 

 which per- 

 mits the 

 wrappings to 

 be done with 

 an advance 

 oi %, 1, and 



IJ^-inches per revolution of the shuttle, the speed of which is 

 300 r. p. m. The device handles coils with an inside diameter of 

 from S to 20 inches, and cross-sections of from 2 to 5 inches. 

 It is stated that the actual wrappin,? time of a coil of average 

 size is 10 seconds and that a regular output of 125 coils an hour 

 may be attained. 



The machine is provided with a motor, and a conveniently 

 located lever controls both the clutch and the brake. A novel 

 way of overcoming the difficulty of getting the various sized coils 

 exactly in the center of the shuttle in order to apply the paper 

 evenly, is through the use of the slanting runway at the left of 

 the machine. The correct position for the different sized coils is 

 secured by raising or lowering the bar, which in turn raises or 



Pierce Wire W'r.m'pinc Machine 



