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THE FILM 189
Study Fig. 61. The rewinder elements are of the Simplex type. A is the rewinder table top of fairly heavy lumber. C an iron shelf bracket, obtainable at any ten-cent store. D, iron switch box of the flush wall type containing a toggle type switch, single pole, Hush type. E is an extension measuring 3/16 inch in diameter by 1^4 inches long, threaded at one end and screwed into a hole at the end of the switch handle. It provides the necessary leverage to enable spring I to open the switch. F is a small coil spring 3/16 inch by 2 inches designed to act as a shock absorber. G is a round belt about y% inch in diameter. H is a pulley attached to the rewind rear or dead element shaft. It is 2>y2 inches in diameter and should have a fairly wide groove to enable proper operation of belt G. I is a coil spring y inch in diameter by 5 inches long. It should exert a five-pound pull when stretched. J is a box, or other support for box D. K is a pulley on the driving element of the rewinder, 8 inches in diameter. L is a two-step idler pulley, the small element 1% inches and the large one Al/2 inches in diameter at the bottom of the groove. All pulley diameters are measured at the bottom of their grooves. M is the motor pulley 1*4 inches in diameter with a speed of 1750 rpm.
Fig. 61 shows the reels in position for rewinding, the arrows indicating direction of rotation. The friction of belt G will exert a pull against spring I and stretch it. The switch is closed by moving the handle extension E back, the action stretching spring T. There must be enough friction between belt G and pulley H to keep the spring I stretched, the switch remaining in closed position as long as pulley H rotates.
When rewinding is completed the film pulls loose from reel A, whereupon it stops and so does pulley H; automatically spring I contracts, pulling switch handle E to position "off" ; as a consequence the motor circuit is broken and the whole thing stops.
Both rewinder shafts must be long enough to enable the proper mounting of pulleys H and K. It is quite easy to make longer shafts by securing a length of