Figs. 90-92.
(172) A motion patented by Messrs. John Hetherington and Sons is illustrated in Figs. [90] and [91]. In Fig. [92] a side view of a carding engine is shown, with the motion applied to it. On the stud G, which usually carries the intermediate band pulleys, shown by the dotted line I, the boss F of the supporting frame A is fitted. The apparatus is shown in Fig. [90] in section, and consists of the supporting frame named, the boss A1 of which forms a bearing for the shaft B, with the eccentric B1 formed on it. On one end of the shaft the double grooved pulley C is fixed, by means of which it is revolved. An internal rack A2 is formed on the fixed frame A, and adjoining the latter is the compounded pulley D. D is also formed with an internal rack and a single grooved pulley, and revolves on the outer end of the shaft B, being kept in position by the nut and washer shown. There are thus two racks, each containing the same number of teeth, one fixed and the other free to revolve. Mounted on the eccentric B1 are two wheels E E1, the latter being smaller in diameter than the other, this arrangement being shown clearly in front view in Fig. [91]
(173) The action of this mechanism is as follows: The pulley C is driven by a band K passing over the pulley J on the main cylinder shaft H. In this way C is revolved, and the eccentric movement of the shaft B causes the wheel E1 to fall into gear with the rack A2. This gives a rotary motion to the wheels E E1, and the larger diameter of E causes it to revolve at a greater rate than E1. The revolution of B, in addition to setting up this rotary motion in the compound wheel E E1, also puts E into gear with the rack D1, and causes the latter to revolve. The motion of the pulley C is thus communicated to D, but the latter is revolved at a much slower velocity in the direction of the shaft. By proportioning the pulleys and wheels the necessary reduction in speed can be obtained. The revolution of D is communicated to the cylinder by the band L passing over the grooved pulley M.
Fig. 93.J.N.
Fig. 94.
(174) In the machine as made by Mr. Samuel Brooks, the motion is compounded with the barrow wheel detaching motion, as illustrated in Figs. [93] and [94]. On the same stud as the barrow wheel is a helical wheel C, which is driven from the former by a clutch, and which engages with a wheel D fastened on the lower end of a shaft placed at an angle of 97°. On the other end of the shaft a worm F is fixed, and gearing with the wheel G. During grinding the barrow wheel is disengaged by means of the lever in which the stud carrying the former is fixed, and the worm is thrown into gear. The speed of the cylinder is thus reduced to about one revolution, the necessary rotation of the wheel C being obtained from the pulley on the cylinder shaft. When it is desired to grind the cylinder the strap is thrown on to the pulley, and the necessary rotation given to the barrow wheel B and helical wheel C. The arrangement thus described is always in position, and does not require separately attaching to the machine, as is the case with most of the motions in use.
