72 ANNUAL OF SCIENTIFIC DISCOVERY. 



placed within, it can be compressed by a taper nut working in the 

 outside screw. A spring is used to open the clutch, when the nut is 

 relaxed, and, as it is attached by arms to the bed of the machine, this 

 clutch can be set to any ano;le. The bed of the machine is movable, 



~ 



so that the work can be shifted horizontally. 



t? 



CONVERTING ROTARY INTO RECIPROCATING RECTILINEAR 



MOTION. 



HENRY BAKER, of Catskill, N. Y., has taken measures to secure a 

 patent for a new method of converting rotary into reciprocating rec- 

 tilinear motion. The invention is more particularly designed for the 

 purpose of driving the bed of a printing press, or the bed of any part 

 of a machine to which it is desired to communicate a reciprocating 

 rectilinear motion from a revolving shaft, but it is also applicable in 

 almost any case where the said change of motion is required. The 

 motion is communicated in the first place from the revolving shaft to 

 one or tw r o wheels or pulleys, around which an endless belt or chain is 

 placed, the said wheels and belt being so arranged that the belt will 

 move in a direction parallel, or nearly so, with the desired reciprocat- 

 ing movement. To the bed or object which is to receive the recipro- 

 cating movement, there is attached a ring which lies near to the belt, 

 its inner diameter being about equal to that of the wheels or pulleys 

 on which the belt runs. Two pins slide freely through the periphery 

 of the ring on opposite sides, both pins being parallel with the band, 

 and made to project by springs a short distance into the ring. A stud 

 is attached to the endless band, and is made to project into the ring 

 close within its periphery, at right angles to the pins mentioned. As 

 the bind moves, this stud catches one or other of the pins, and pro- 

 pels the ring, and whatever is connected with it. One part of the 

 endless belt or chain, on one side of the wheels, moves in the opposite 

 direction to the other side, alternately, and the sliding pins are so 

 placed, that, when the $tu<I spoken of moves in one direction, it catches 

 with one, and when it moves in the other direction it catches with the 

 other, and the pins are drawn back from the ring. At the time the 

 stud on the running belt reaches either of the pulleys, it runs around 

 it on the belt and catches the other pin, and by its reversed movement 

 drives back the ring in the opposite direction to that in which it moved 

 before, and thus by an alternate reversal of the ring by the action of 

 the stud on the pins, there is a continual change of motion from rotary 

 to the reciprocating rectilinear, and there is also an intermittence of 

 the motion, which is very desirable in the working of some machines. 

 Scientific American. 



NEW COMPACT GEAR. 



THE Scientific American thus notices a new compact gear invented 

 by Messrs. Dibben and Bollman, of New York, and exhibited at the 

 Fair of the American Institute. This invention, exhibiting great 



