616 



THE INDIA RUBBER WORLD 



[August 1, 1914. 



RE-SURFACING PRINTERS' BLANKETS. 



/^KE of the largest items of expense in connection with 

 ^^ printers' and lithographers' presses has always been the 

 replacing of the rubber blankets. According to a new process, 

 patented by Gustave Kush, of New York City, old blankets may 

 be re-surfaced with a covering of new rubber, thus considerably 

 decreasing the expense of supplying blankets. 



Rubber iiress blankets made in the usual manner have a back- 

 ing of fabric and a covering of rubber vulcanized together at 

 the factory. If the rubber surface becomes creased, pitted or 

 otherwise worn, the blanket no longer meets the requirements 

 of perfect work, and must be discarded. In order that the rubber 



In order to catch and carry back the unmixed ingredients to 

 the roll A, an endless apron G" is carried upon rollers H, I and 

 /. The roller H is mounted upon two side arms K, which 

 swing around the axis of the roller /, so that the apron may be 

 raised in contact with the roll A, or lowered into a horizontal 

 position, as indicated by the dotted lines. When the apron is 

 raised it is driven by friction, and the ingredients caught by it 

 are carried to the top of the roll A, and again passed through 

 the mixer with the rubber. 



At the ends of the roll A are two blades L, shaped like plow- 

 shares. They may be raised and lowered by means of hand- 

 screws M. When lowered in contact with the roll A they con- 

 tinuously .scrape the rubber from the roll and turn it over, so 

 that fresh surfaces are exposed to take the compound- 

 ing ingredients falling from the hopper. By means of 

 this uninterrupted overturning of the gum, effected 

 mechanically and without manual assistance, it is said 

 that a homogeneous mi.xture can be olitained in a re- 

 markably short time. 



This mixer is the subject of United States patent 

 No. 1,100,768, granted to Andre Olicr, of Clermont- 

 Ferrand, France. 



Rush's Process of Rep.mring Printers' Bl.\nkets 



surface may be stripped from the faliric. the new lilanket has a 

 thin layer of unvulcanized rubber between the faliric and the 

 exterior vulcanized cover. In the accompanying drawing, the 

 blanket roll A has two grooves /?, in which the blanket is 

 clamped by bars C. When the blanket becomes worn, these 

 bars are removed, the blanket taken from the roll, and the outer 

 covering D stripped ofif. A new .sheet E of rubber of the 

 proper size is then cut and rolled smoothly, by means of a 

 hand roller F, over the surface of unvulcanized rubber C. The 

 blanket is then as good as new. and it is quickly replaced on 

 the roll, obviating the loss of time necessary with the older 

 method of taking down the roll and attaching 

 an cntirelv new blanket. 



A TENSION DEVICE FOR CALENDERS. 



IN the specifications of a recent patent is described 

 a device fur maintaining an even tension on a strip 

 of fabric passing from a sujiply roll to the calender, 

 or from one calender to another. Referring to the 

 accompanying drawings, which show an end elevation 

 and a side view of the apparatus, it comprises two 

 idler rolls A and B attached to the opposite sides of 

 the frame C. Between these two rolls is a third roll 

 D mounted in carriages E, which slide up and down between the 

 frame members. This sliding roller is raised and lowered by 

 means of cables E and G, attached to the carriages E, and passing 

 over sheaves H and 7. These cables are secured to a cross-head / 

 at the upper end of a piston rod A'. On the low-er end of this 

 rod is a piston, which reciprocates in a hydraulic cj'linder L. 

 Water enters the cylinder through a pipe .1/, and the pressure is 

 controlled by a regulator .V. 



The operation of the device is as follows: The fabric is car- 

 ried under the roll A over the sliding roll D, and under the 

 roll B. During the movement of the fabric over these rolls 



A MIXER THAT ELIMINATES 

 MANUAL LABOR. 



'XV/E illustrate herewith a new rubber mixer 

 T' which has an attachment for continu- 

 ously turning the rubber over as it passes be- 

 tween the rolls, thereby eliminating the manual 

 labor necessary with the usual type of two- 

 roll machine. This mixer also has an ad- 

 justable apron which catches the unmixed in- 

 gredients and carries them back to the upper 

 part of the rolls to be mixed with the rubber. 

 The two drawings of the machine show an 

 end view and a side elevation, both partly in 

 section. The machine has two horizontal rolls 

 A and B. the first of which is steam-heated. 

 Above the rolls is a hopper C, having a sufficient capacity to hold 

 all of the ingredients except the rubber, for one batch. At the 

 bottom of the hopper is a cylindrical distributor D, driven by a 

 chain E. This device distributes the powdered ingredients over 

 the rubber as it passes down between the rolls. The distributor 

 may be started or stopped by operating a clutch F. 



Olier's !Mixing M.^CHI^•E. 



the regulator N is set to maintain a pre-determined pressure on 

 the piston in the cylinder L. The result is to force the piston 

 down, to raise the sliding roll D, and to impose an even pressure 

 on the fabric passing over the rollers. For instance, if any 

 slackness occurs in the fabric while passing to the calender, the 

 roll D raises, and the pressure on the piston causes the surplus 



