366 FILE 



lever r, every time that a tooth passes the inclined piano t, the click g, is made to 

 drive the ratchet wheel p, and thereby the advancing movement of the blank is effected 

 after each blow of the tilt hammer. 



There is a strong spring -11, attached to the upper side of the tilt hammer, its end 

 being confined Tinder an adjustable inclined plane v, mounted in the frame w, which 

 inclined plane can be raised or lowered by its adjusting screws as required, to pro- 

 duce more or less tension of the spring. 



A similar spring is placed on the under side of the tilt hammer, to raise and sustain 

 the cutter or tool clear of the bed after every blow, and, in conjunction with safety 

 holders or catchers, to counteract any vibration or tendency the spring u may have 

 to cause the hammer to reiterate the blow. 



The end of the lower spring acts on an inclined plane, mounted in the frame w, 

 which has an adjusting screw similar to u, to regulate the tension of the spring. 



In case the under spring should raise, that is, return the hammer, with sufficient 

 force or velocity to cause the top spring u, to reiterate the blow, the ends of the safety 

 holders or catchers are made to move under and witch the tail of the lever b, imnie.li- 

 atcly on its being raised by the under springs, which is effected by the following 

 means: The holders are mounted upon a plate or carriage 1, jig. 857, which turns 

 upon a small pin or axle mounted in the cars of a cross bar ; the xipper ends of the 

 holders are kept inclined towards the tail of the tilt hammer by means of a spring 

 fixed to the cross bar, and which acts upon one end of the plate or carriage. 



In order that the holders may be removed out of the way of the tail of the hammer 

 /;, when the tilt wheel is about to effect a blow, the tooth of the tilt wheel which 

 last acted upon the hammer comes in contact with an inclined plane fixed on 

 the plate or carriage 1, and, by depressing that end of the plate, causes the upper 

 ends of the holders to be withdrawn from under the tail of the hammer b. The 

 tilt wheel continuing to revolve, the next tooth advances, and depresses the tail of the 

 hammer, but, before it leaves the tail of the hammer, the tooth last in operation will 

 have quitted the inclined plane and allowed the spring to return the holders into their 

 former position. After the tooth has escaped from the tail of b, the hammer will im- 

 mediately descend and effect the blow or cut on the blank, and, as the tail of the 

 hammer rises, it will come in contact with the inclined planes at the upper ends of the 

 holders, and force them backwards ; and, as soon as the tail of the hammer has passed 

 the top of the holders, the spring will immediately force the holders forward under 

 the tail of the hammer, and prevent the hammer rising again until the next tooth 

 of the tilt wheel is about to depress the end of the hammer, when the same move- 

 ments of the parts will be repeated, and the machine will continue in operation until 

 a sufficient length of the blank of steel (progressively advanced under the hammer) 

 has been operated upon, when it will bo thrown out of gear by the following 

 means : 



Upon the sliding bar 6, there is placed an adjustable stop, against which the fore- 

 most end of tho slide 1 1, fig. 858, comes in contact as it is moved forward by the rack 

 n, and its pinion. The sliding bar 6, is connected at its left end to the bent lever S. 

 the other end of this lever being formed into a forked arm, which embraces a clutch 

 upon the main shaft, and, as the slide I continues to advance, it will come in contact 

 with a stop ; and when it has brought a sufficient length of the blank pieces of steel 

 under the operation of the cutting tool, tho slide /, in its progress, will have moved 

 that stop and the bar 6 forward, and that bar, by means of the bent lever 8, will with- 

 draw the clutch on the main shaft from locking into the boss of the fly- wheel, and 

 consequently stop the further progress of the machine; the rigger and fly-wheel 

 turning loosely upon the main shaft. 



The ctit file can now be removed from out of the clamps, and reversed to cut the 

 other side, or another blank piece put in its place ; and after throwing bark the pall 

 q of the ratchet wheel p, the slide /, and with it the fresh blank, may bo moved back 

 into the machine by turning the winch handle, on the axle of the ratchet wheel p, the 

 reverse way, which will turn the pinion backwards, and draw back tho rack n, without 

 affecting any other parts of the machine ; and on moving back tho bar G, by the 

 handle 11, placed on the stop, tho clutches will be thrown into gear again, and tho 

 machine proceed to cut tho next blank. 



"When tho blanks have been thus cut on one side, and are reversed in tho machine 

 to form the teeth upon tho other side, there should be a piece of lead placed 1> 

 tho blank and tho bed to protect tho fresh-cut teeth. 



It will be seen that the position of the stop upon the bar 6, will determine tho 

 length or extent of the blank piece of steel which shall be cut. or operated upon ; and 

 in order that the progressive movement of the blanks under tho cutting tool may be 

 made to suit different degrees of fineness or coarseness of the teeth (that is, the <ii>- 

 tanco between the cuts), thcro is an adjusting screw upon tho lever r, the head of 



