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THE INDIA RUBBER WORLD 



[September 1, 1917. 



New Machines and Appliances. 



THE BANBURY AUTOMATIC MIXER. 



iKOGRESSIV'K builders of rubber machinery are constantly 

 •■tuciying the rapid advancement of rubber mill practice with 

 the object of developing the nccesary machines that will meet 



t h e mechanical 



ri.-(iuirements of 

 present - day 

 metliods. That 

 fciK'h inventive 

 effort has been 

 productive i n 

 evolving a mix- 

 ing machine of 

 novel design 

 and proven effi- 

 ciency is shown 

 in the accom- 

 ]>anying illus- 

 iraiiuM. 



This machine 

 i^ adapted to 

 lircak down the 

 riiljber and mix 

 the compound- 

 ing ingredients 

 at the same 

 time; in fact, it 

 is capable of 

 I)crforming the 

 work usually 

 (lone on the 48- 

 ()0 and 84-inch, 

 two-roll mixing 

 mills. It is es- 

 sentially an enclosed machine, comjirising two revolving blade 

 shafts that rotate in individual cylindrically-shaped troughs, the 

 bottom of which forms a door through which the finished stock 

 is discharged. The stock is kept under pressure by a weight 

 that is controlled by the vertical shaft and ram located above 

 the feed hopper, thus assuring uniform feeding during the mix- 

 ing operation. The mixer may be driven by direct gearing 

 from the mill shaft or by individual motor drive, and in some 

 cases chain drive is preferred. 



In operation the rubber and compounding ingredients may be 

 dumped into the machine while it is running. However, with 

 some compounds it is preferable first to break down the rubber 

 and then add the ingredients, the subsequent action of the 

 machine being entirely automatic. When the batch is thorough- 

 ly mixed, the bottom door is opened and the load is automatical- 

 ly discharged, the mixer being ready for the next batch within 

 a fraction of a minute. 



Uniformity of product is the principal advantage claimed for 

 this machine as it will always do an equal amount of work for 

 the same number of revolutions, that is to say, for the same 

 time. It is the machine and not the operator that controls the 

 actual mixing operations. Another advantage due to the en- 

 closed construction of the machine is that of cleanliness when 

 compounds containing lampblack or gasblack are milled. 

 [Birmingham Iron Foundry, Derby, Connecticut.] 



SOUTHWAHK QUICK OPENING VULCANIZEH DOOR, 



The accompanying illustration shows a new vulcanizer door of 

 the quick opening type that possesses, in connection with 

 unusual facilities for easy handling, the quality of being explo- 



sion-proof. In the old type vulcanizer head provided with 

 swinging bolts, should a few of these bolts become loose, as of- 

 ten happens, the other bolts arc thrown out by the internal 

 pressure and the door opens violently, causing an explosion. 

 The locking mechanism of the Southwark door, however, is of 

 the breech-lock type and constructed so that when the cover is 

 shifted the taper on the lugs lifts the lid sufficiently to admit air, 

 thus preventing the possibility of an explosion. 



The door is opened quickly witli very little effort, by means of 

 a rack and pin- 

 ion mechanism 

 that is operat- 

 ed by one man 

 and shown in 

 the illustralidii, 

 Connec t i o n s 

 are provided in 

 the head for 

 attaching tem- 

 perature and 

 pressure gages. 



All castings 

 are made from 

 open heartli 

 steel and the 

 dished part of 

 the door is 

 boiler plate. 



Where vul- 

 canizer doors 

 of the swing- 

 ing bolt type 

 are used, this 

 style of door 

 can easily be 



installed by making a special locking ring which may be bolted 

 to the existing ring that is riveted to the shell. [Southwark 

 Foundry & Machine Co., Philadelphia, Pennsylvania.] 



THE HOLMES OVERFLOW TRIMMER. 



The labor expense connected with trimming the overflow from 

 mechanical rubber goods is an item of considerable importance 

 where large quantities of standard goods are made. The opera- 

 tion should be quickly and 

 accurately performed and in 

 this respect the trimmer 

 here shown is fully guaran- 

 teed by the makers. 



The machine is of the 

 foot - power, punch - press 

 type adapted to be mounted 

 on a bench or table. It is 

 especially designed for trim- 

 ming small mold work, 

 such as fuller balls, disks, 

 bumpers and articles of reg- 

 ular or irregular shapes. 

 Tlie question of accuracy in 

 trimming is definitely de- 

 use of punches and dies that are care- 

 to conform to the shape of the article to 

 he construction and simplicity of the press per- 

 mit the turning out of a maximum product by an operator of 

 ordinary skill and intelligence. [Holmes Brothers, 500 South 

 Peoria street, Chicago, Illinois.] 



termined by the 

 fully constructed 

 be trimmed. The 



