90 TECHNOLOGY. 
motions, and carries the carriage back to the head-stock when the other motions 
have all ceased. This apparatus consists of the cam-shaft, d, and a friction- 
pulley, ¢, which has four parallel grooved cavities at equal.distances in its cir- 
cumference, in any one of which the leather-covered pulley d (jig. 10) may 
slide, when revolving opposite to the groove; the pulley dis moved by a cog- 
wheel, 2, upon the same axis, which is driven by a cog-wheel, 1, connected 
with the pulley c. When an edge of any one of the grooves of the pulley ¢ 
by the action of a spring is made to press against the leather-covered pulley 
d, the latter will turn the pulley ¢ by friction through a quadrant, till the 
shaft 6 is arrested by a catch, which prevents the further action of the spring, 
and makes the pulley d run in the concavity of the next groove. By disen- 
gaging the catch, the grooved pulley ¢ will turn through another quadrant, 
and so in succession, making four different motions in one complete stretch : 
3 is a pinion upon the shaft @, which drives, by means of the intermediate 
wheel 4, the cog-wheel 5 (fig. 9), which gives motion by means of the bevel- 
wheels 6 and 7 to the shaft connecting the front rollers of both sides of the 
machine. Upon the shaft / is also a pinion, 8, which engages with the cog- 
wheel, 9, on the:shaft g, carrying a drum, ©, which draws the carriage out 
by means of a rope. The rollers are stopped by moving the bevel-wheel 7 
out of gear with 6, uncoupling the wheel 8 with the shaft 7, and at the 
same time bringing the small bevel-wheel 10 into gear with the wheel 11, 
from which the drum £ now derives its motion. The wheel 10 is driven by 
a crossed band from a small pulley, on the shaft with the cog-wheels 5 and 6, 
to the pulley 7 on the shaft 2; by which means a slower motion is com- 
municated to the drum £ and carriage. From the front roller shaft motion 
is communicated in the usual manner to the other rollers, the carrier-shaft 
# serving for the rollers on both sides of the machine. 
F is a double spiral scroll upon a shaft running in the main frame 4; 
to“the smaller radii of the scrolls are attached ropes going round the spirals ; 
these ropes, after making a few turns round the drums = and 6, are severally 
attached thereto. Two other ropes are attached to the barrels © and 6, the 
other ends of which are attached to two small drums of the carriage H 
(fig. 8); the ratchet-wheels seen upon the shafts of these rollers are for the 
purpose of tightening the ropes as required. The spiral scroll r has nothing 
to do with the outward motion of the carriage; this is effected by the 
revolving drum r. When the latter is disengaged by throwing the bevel- 
wheel 10 out of gear with 11, the carriage stops until it is to be returned, 
at which juncture the pinion 12 is engaged with the bevel-wheel 13, which 
thus drives the shaft bearing the scroll r. This now moves the carriage, 
first with an increasing, and then with a decreasing speed, as it nears the 
roller-beam; the drawing-out ropes remaining fully stretched, since the 
scroll gives off as much rope in one direction as it takes up in another. 
The pinion 12 upon the shaft g, which revolves uninterruptedly (although not 
in gear with 13), is driven by the wheel 14 (jig. 10), which receives motion 
from the intermediate wheel 15 upon the shaft 7, which also carries the 
wheel 16 (jigs. 8 and 10). The wheel 16 gets its motion from the wheel 1, 
which drives also the friction-pulley d. | 
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