644 



THE INDIA RUBBER WORLD 



JlNE 1, 1921 



and must follow this impression at each revolution. The operation 

 of the machine is as follows : 



A roll of cloth that has been previously coated is placed in the 

 friction let-off bearings on the feed side of the calender, and the 

 end of the cloth passed between the engraved roll and the lower 

 paper-covered roll. This end is attached to a wind-up arrange- 

 ment and rolled as fast as calendered. 



Speaking of the paper rolls, when the machine is new the rolls 

 are ground or turned down smoothly. The pattern of the steel 

 roll is run into them by dampening the paper and running the 

 machine until the paper roll or rolls are well tracked. In this 



of rubber shoes whenever they are ornamented. The pebbled leg 

 sometimes found on rubber boots is embossed either on the paper 

 roll used in carriage cloth work, or on steel rolls fitted to an 



Le.mher Pebble Le.mher Gr.mn 



C.\RRiAGE Cloth Embossing 



way, with a small steel roll, a good impression may be obtained 

 on the tightest goods. 



TWO-ROLL EMBOSSING CALENDER 



A two-roll embosiing calender for producing carriage cloth 

 with a pebble or leather-grained pattern is shown in the illustra- 

 tion. The lower roll A is 15 inches in diameter by 60 inches long, 

 and is made with a cast-iron center built up to the required 

 diameter with layers of paper hydraulically compressed. The top 

 roll B is of the same size and is made of forged steel. The sur- 

 face of the roll is engraved with a pebbled or grained surface to 

 produce the desired pattern on the rubber surface of the cloth. 

 The upper roll is adjusted vertically by screws C at each end 

 and it is cored for steam and provided with steam connection D. 



ST.\xn.\RD Embossing C.\lenders 



upper calender. Upper ami soling calenders are either separate 

 machines or made in combination. 



There are several designs of combined soling and upper cal- 

 enders in use, but they are about the same in principle, varying 

 only in the way the rolls are arranged. 



Twc-RiiLi. Embossing Calender 



The large gear E is keyed to the shaft of the lower roll and is 

 driven from the usual spur pinion on the driving shaft under the 

 bed of the machine. 



RUBBER FOOTWEAR ElVtBOSSING 



Rubber shoe, boot and Iciiiiis soles are all emliosscd on calenders 

 fitted with specially engraved steel rolls. So also are the' uppers 



Sole and Heel Embossing 



A good standard type of machine is as follows : Three 12 by 

 30-inch chilled iron rolls are set horizontally in housings, and one 



10 by 30-inch steel roll is set against the upper chilled roll. 



."Ml of the rolls are bored out and arranged with stuffing 



bo.xes having goose necks connected with steam and water 



for controlling temperature. 

 The middle chilled roll is a drive roll and is driven from the 

 driving shaft underneath the machine. The lower chilled roll is 

 driven from the middle or drive roll with gears on the saine end 

 as the drive gear, giving a friction on the bottom roll of IK' to 1. 

 The top chilled roll is driven hy gears on the opposite end from 

 the drive gear at even speed. The engraved roll is also driven 

 at even speed from the even gear on the end of the top roll. The 

 arrangement of the engraved roll in the housings is especially 

 designed so that this roll can be easily removed and rolls of 

 different pattern substituted. 



It is well to have at least two speeds on an engraved upper or 

 sole calender, as in running heavy material a slow speed is neces- 

 sary to give best results. A good standard is 8 yards per minute 

 for slow speed and 12 yards per minute for high speed. The 

 machine described requires about 15 h.p. to operate. It is built 

 regularly in the following sizes : 8 by 18-inch, 10 by 18, 10 by 

 26, 12 by 30 and 12 by 36; but a good average size is 10 by 26 

 or 12 by 30. 



SHOE UPPER CALENDER 



In the Pearce shoe upper calender the arrangement of the rolls 

 is as follows : The rubber compound is fed at A between the 



