November 1, 1920 



THE INDIA RUBBER WORLD 



107 



contact with the mandrel. Then the limit stop on the right-hand 

 side of the machine is set on the feed-screw. The tire is cut and 

 the open end is placed over the mandrel, projecting a distance 

 beyond the knife equal to the width of the sample desired. The 

 vise is adjusted and closed, holding the tire firmly around the 

 mandrel. The knife advances through the work to the limit set- 

 ting of the feed-screw. A small amount of water from the water 

 tank each minute insures easy cutting. 



Each machine is supplied with two mandrels, for 3-inch and 

 4>^-inch tires, and two circular cutting knives. 



The manufacturer announces that the sample section cutter is 

 not furnished with motor, but that a J'j-h.-p. motor running at 

 1800 r. p. m. geared down to give a speed of 60 r. p. m. to the 



The ventilator is of heavy galvanized iron. The sectional view 

 illustrates the ingenious way in which the damper is opened or 

 closed. A cord attached to the damper is run through a small 



Sample Section Tire Cutter 



rotating knife may be used with it. A belt shaft is constructed 

 to shift the belt on machines equipped with motors. — Peerless 

 Machine Company, Racine, Wisconsin. 



BURT VENTILATORS FOR RUBBER FACTORIES 



A decided improvement in ventilators is this new glass-top 

 style. It should be of interest to all rubber manufacturers, not 

 only as an aid in economically solving the ptoblem of correct 

 ventilation, but also as a means of securing better lighting facil- 

 ities. 



The ventilator is stationary and immovable. Impure air, steam 

 or gas from the building is automatically drawn up and fresh air 

 supplied without lowering the temperature inside too far for 

 comfort. There is no other expense attached to the equipment 

 outside of the original cost of the ventilators, which are simple 

 in design and noiseless. 



The damper is constructed in such a manner that the air shaft 

 always remains free and open. Back currents of air are elimi- 

 nated. At no time does the ventilator become clogged up with 

 ice, snow or other substances. It is said that during calm weather 

 any movement of the outer air is sufficient to cause an upward 

 flow of air in the air shaft, thus drawing out the hot air and 

 supplying fresh air. 



Another advantage of the glass-top ventilator is the fact that 

 the light cannot be shut off, even when the damper is closed. It 

 is further affirmed that where this combination ventilator and 

 skylight is used, no other form of skylight is necessary. 



Gi.ASs-Top Ventilator 

 Sectional View Outside View 



pulley suspended from the bar at the top. The damper itself is 

 a rounded piece of galvanized iron fitted inside of the outer walls 

 of the air shaft. — Burt Manufacturing Co., .■\krnn. Ohio. 



MACHINE FOR CUTTING HARD RUBBEJl COMBS 



Dressing combs of hard rubber are molded in presses, and 

 after vulcanization the teeth are cut on specially designed ma- 

 chines of the type shown in the illustration. 



This machine feeds 

 and stops automatically. 

 The weight draws the 

 comb down on the saw 

 that cuts the first tooth, 

 and a cam then raises 

 the comb from the saw 

 which is carried along 

 the space for one tooth 

 by a cam and rack. This 

 continues until all the 

 teeth have been sawed, 

 when the machine stops. 

 The rack and cam can be 

 taken out and others sub- 

 stituted if a different 

 number of teeth to the 

 inch are to be sawed. 



These machines are 

 usually operated i n 

 gangs, 15 machines be- 

 ing operated by one operator who can turn out under favorable 

 conditions 1,200 to 1,500 dressing combs a day. 



The machine for sawing teeth in fine combs also feeds and 

 stops automatically. It is similar to the dressing comb sawing 

 machine, except in size. — The College Point Mold & Engraving 

 Co.. 714 Seventh .A. venue, College Point, Long Island, New York. 



Dressing Comb Sawinc. Machine 



MACHINERY PATENTS 

 TIRE MOLD CONVEYING SYSTEM 



THIS invention comprises a system of conveyors and mold- 

 handling apparatus operating continuously, whereby the tire 

 molds are filled, moved in and out of the vulcanizers, and the 

 cured tires removed from the molds which are then cleaned and 

 refilled. Referring to the illustration, Fig. 1 is a plan view at the 

 plane of the vulcanizers, and Fig. 2 is a side elevation. 



Suspended on hooks, the uncured tires and cores are suc- 

 cessively delivered by the conveyor A to the loading station B, 

 where they are placed in the molds. At station C the upper 

 mold halves are lowered and registered with the lower halves, 

 when the molds are delivered to the heaters D. At the same 

 time molds are being discharged from the heaters and conveyed 



