NOVEMBKR 1, 1915.J 



THE INDIA RUBBER WORLD 



65 



New Machines and Appliances. 



A MOTOR-OPERATED SCREWDOWN FOR CALENDERS. 



CALENDER rolls require extremely accurate adjustment 

 and are quite heavy. The result is the use of a hand- 

 wheel screwdown mechanism which is geared very low 

 and operated for a considerable period of time if the rolls 

 are to be moved any distance. Whenever a calender is 

 changed from frictioning to sheeting, it is necessary to drop 



the bottom roll to lia\e it completely clear the sheet of rubber 

 which is delivered from the lower side of the middle roll. 



Because the hand-wheel operating the screwdown mech- 

 anism must be revolved so many times and is an extremely 

 tiresome job. calender operators drop the bottom roll barely 

 enough to clear the sheet. As a result, a very considerable 

 personal injury hazard is created, for there is a fair probability 

 of a careless operator getting his fingers caught between the 

 bottom and middle rolls. As a matter of fact, many accidents 

 have occurred which were directly due to the hand-wheel. 



The accompanying sketch on this page shows diagram- 

 niatically the manner of installing a motor screwdown mech- 

 anism. In this, the hand-wheel ordinarily employed is re- 

 moved and a sprocket wheel for silent chain drive substituted. 

 The motor screwdown mechanism is placed at one side and 

 operatively connected with the sprocket on the screwdown 

 shaft by a suitable length of silent chain. The usual clutch 

 for selecting top or bottom rolls is retained. Two control 

 pedals, one for opening, the other for closing the rolls, take 

 the place of the hand-wheel. The improvement is a notable 

 one and will at once be appreciated by all practical rubber men. 

 The old hand-wheel with its slow, laborious movement and the 

 ever present element of danger in its use, can now be con- 

 signed to the scrap pile. [The Cutler-Hammer Clutch Co., 

 Milwaukee, Wisconsin.] 



SOUTHWARK SOUS TIRE PRESS. 



This is a belt-driven 200-ton hydraulic press for forcing solid 

 tires on rims. 



One point of superiority is that the lower table is movable 

 and very much low- 

 er than usual, which 

 makes the handling 

 of the tires much 

 easier; while in prac- 

 tice, two men can 

 turn out much more 

 work than with the 

 older type of press. 

 .Another advantage 

 1^ that the ram 

 1^ brought down 

 through the idle 

 stroke vv i t h tank 

 pressure, therefore 

 no power is required 

 for doing actual 

 work. 



The machine is 

 controlled from a 

 patented operating 

 valve so designed 

 that at any time the 

 press is at rest — 

 either on the up or 

 down stroke — the 

 water is automatically by-passed. This feature eliminates the 

 safety valves against which the pump frequently had to operate 

 on other types of machines. [Southwark Foundry & Machine 

 Co., Philadelphia, Pa.] 



THE SCOTT FARRIC TESTER. 



This tester is known as the horizontal type and is designed 

 for heavy work. It has two heavy cast-iron frames holding 

 four solid steel bars V/i inches in diameter. 



Resistance to the pull on the sample is obtained by dead 



e no sprmgs 

 one-piece cas 



influence the test. The 

 rigidly fastened to the 



weight and there 

 recording head is 

 frame. The 

 main shaft m 

 tates in tu- 

 frictionle,^ 

 ball bearin.t;s 

 protected by 

 dust caps. On 

 this shaft is 

 affixed a large 

 metal drum 

 having a fin- 

 ished surface 

 4 inches in di- 

 ameter to re- 

 ceive a chain 

 connect ing 



with the he.id clamii. .\ttache<l rigidly to each side of this 

 drum are two hnishcd steel bars heavily riveted at their lower 

 ends to form one solid unit. These double bars carry the re- 

 sistance weights, which are iron and made in sections for con- 

 venience in handling. The capacity of the machine is deter- 

 mined bv the number of weights placed upon the levers. Two 



