Chapter LXIV: Section 74: Reversing Gear

For Reversing Gear of Steam Engines, see Section 79.

=1290. Reversible driving motion= by open and crossed belts, with two loose and one fast pulleys.

=1291. Reversible driving motion= by single belt, two fast pulleys and one loose ditto and bevil gear, one bevil pinion having a sleeve to which its fast pulley is keyed, the other bevil pinion being keyed to the shaft.

=1292. Reversible driving motion= by single belt, with quick and slow motions; a modification of the last.

=1293. By double clutch and bevil gear.=

=1294. Reversing friction cones or bevils.=

=1295. Three-wheel gear.= The driving wheel ~A~ can be put into gear either with the driven wheel ~C~ or idle wheel ~B~.

=1296. Double clutch and spur gear= reversing motion, with idle wheel.

=1297. Reversing pinions,= as used on the ordinary screw-cutting lathe. There are many varieties of this gear in use.

=1298. Application of single belt gear to= No. 1296.

=1299. Self-reversing gear,= with one belt, two fast and one loose pulleys. The large spur wheel is driven from the bevil gear, and carries the weighted lever past the vertical position by a stop on the face-plate or disc, when it falls over and reverses the belt fork. See No. 1026.

=1300. Self-reversing gear,= as applied to planing machines. The stops can be set at any required distance apart, to alter the length of travel of the machine bed. This plan requires a heavy table to carry the belt across the loose pulley to the other fast pulley.

=1301. Reversible belt-shifting hand gear.=

=1302. Right and left hand screw reversing traverse motion.= Each lever has a half nut, which can be put in gear with the screw to drive either way. See also No. 163.

=1303. Best form of fast and loose pulleys= for open and crossed belt reversing gear, as used in No. 1290; the fast pulley is rather larger in diameter than the two loose ones.

=1304. Single-belt reversing pulleys,= the reverse motion on the shaft being obtained by intercepting an idle wheel ~A~ between the epicycloidal wheel ~B~ and the shaft pinion ~C~, the middle pulley being the loose one; the idle wheel is carried by a fixed bracket and pin.

NOTE.--Reversible motion can be obtained direct from any steam engine
fitted with reversing motion. See Valve Motions, No. 1436, &c.

Segment Reversing Gear, No. 724.