Oi TOBER 1. 1916. 



THE INDIA RUBBER WORLD 



13 



New Machines and Appliances. 



RUBBER SHOE PATTERN ROOM. 



MA.NY problems relating to style, lit, construction and econ- 

 omy of stock are involved in designing and making ready 

 for the manufacture of a line of rubber boots or shoes. 

 Tliese problems come for solution to the pattern room. Such a 

 room is shown in the illustration of the pattern department of the 

 La Crosse Rubber Mills Co., La Crosse, Wisconsin. In addi- 

 tion to solving questions of design and construction, the pattern 

 room furnishes the many sheet metal patterns needed by the 

 factory in the manufacture of goods. These patterns are stand- 

 ardized and graded accurately to size and shape corresponding 

 to the parts they represent in the shoe. The number of such 

 patterns necessary in a factory is very large and subject to 

 constant change and renewal. 



Several features of pattern rnum work are clearly shown in 

 the picture. On the draw'ing board in the foreground the pal- 

 tern maker lays uut a complete set of patterns for a middle size 

 shoe, and cuts them from heavy paper. These serve as original 



Pattkux KociXi IX ."i RfBRER Shoe F.\ctory. 



standards, and by means of a size-grading machine, seen in the 

 background, they are reproduced in proper gradations for every 

 size of shoe desired. 



The graded sets of paper patterns are next transferred to 

 sheet metal for use by the rubber cutters. This is accomplished 

 by outlining the paper pattern on stout sheet tin and, by means 

 of heavy, hand-operated bench shears, cutting the tin to the 

 outline, as the operator in the foreground is doing. Careful 

 size marking and iilmg is necessary to render the standard paper 

 patterns always accessible, and provision for this may be seen 

 in the various tools and furniture shown in the cut. 



SOME GARVIN HARD RUBBER LATHES. 



Li the manufacture of fountain pen barrels and caps, pen and 

 pencil holders, syringe and atomizer parts, electrical switch 

 handles and many other hard rubber products, speed and turret 

 lathes are important. In the illustration, Fig. 1, are shown two 

 views of a 10-inch speed lathe commonly used in hard rubber 

 mills for turning, threading and chasing. The bench lathe is 

 «hown in the first view with the combination cutting hob and 

 leader that operates the chasing bar. In the second view- the 

 fame machine is shown with floor legs and the chasing bar at- 

 tachment removed. The lathe has hardened and ground spindles, 

 running in conical-shaped solid bronze boxes and is provided 



with a tight and loose pulley in. the spindle. It is driven from a 

 countershaft placed at the back of the lathe and connected to 

 the main line. 



The No. 2 screw cutting lathe, shown in Fig. 2, has a plain 

 turret-head, automatic collet, a bar feed, and is very similar to 



Fig. 1. — Hard Rubber SpEF.n Lathk. 



the No. 1 lathe, but is larger and capable of liandlmg hard rub- 

 lier rods up to 1 inch in diameter. It has tight and loose pul- 

 leys in the head instead of a cone pulley and the belt shifter ii 

 directly underneath the pulleys. The counter shaft is placed on 

 a Ijench directly back of the machine which is driven by straight 

 and cross belts. 



Another interesting hard rubber turret lathe is furnislied 

 witif short bench legs or floor legs as desired. This tool is de- 

 signed to handle a greater variety and quantity of work than the 

 lathes pre\inusly described. 'It has a power feed and an auto- 



Fig. 2. — No. 2 Hard Rubber Lathe. 



niatic turret, automatic collet and bar feed for liandling rubber 

 rods up to IJ^ inches in diameter. The slide rest, besides hav- 

 ing the hand lever operated cross motion, is provided with a 

 sidewise swiveling movement. [The Garvin Machine Co., New 

 York City.] 



