US506053A

US506053A - File-cutting machine

Info

Publication number: US506053A
Authority: US
Publication date: 1893-10-03
Anticipated expiration: 1910-10-03

Description

(-No Model.) 5 SheeLs-Sheet F. W. LOWE. FILE. GUTTING MACHINE.

'No. 506,058. Patented 001;. 3,1893.

7 WITNESSES:

INVENTOH ATTORNEYS.

(No Model.) 5 Sheefis-Sheet' 2. F. W. LOW E.

FILE CUTTING MACHINE.

PatntedOct; 3, 1893'.

[I 1 ATTORNEYS.

3 t e e h S S t e e h S 5 E 0 L n a d 0 M 0 m FILE CUTTING MACHINE.

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z 7 4 Z \wu 5 i ggm25$ e l w j 1 w OJ fl v 7///// &AMA MA I A-% N o M H N ma E S w w W ATTORNEYS.

5 Sheets-Sheet, 4.

(No Model.) I

F.- W. LOWE. TILE OUTTING MACHINE. No. 506,053, Patented Oct. 3.1893.

a %-1 B N -X I Y a t I cf 4 O INVENTOH m we ATTORNEYS.

(No Model.) v 5 sheetssheet 5. P. W. LOWE. FILE CUTTING MACHINE. No. 506,053. Patented Oct. 3, 1893.

A TTOHNE Y8.

NITED STATES PATENT OFFICE.

FREDERICK W. LOWE, OF PHILADELPHIA, PENNSYLVANIA.

FILE-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 506,053, dated October 3,1893.

' Application filed April 1,1893. Serial No. 468,719. (No model.)

To aZZ whom it may concern.-

Be it known that I, FREDERICK W. LOWE, of Frankford, in the city and county of Philadelphia and State of Pennsylvania, have invented a new and Improved File-Cutting Machine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved file cutting machine,which is simple and durable in construction, very efiective in operation, and arranged to enable the operator to easily and fully control the several moving devices to produce a proper cut on the file blank.

The invention consists of certain parts and details, and combinations of the same, as will be hereinafter described and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a rear side elevation of the same. Fig. 3 is a cross section of the same on the line 3-3 of Figs. 2 and 6. Fig. iis an enlarged cross section of the device for regulating the stroke of the hammer, the section being taken on the line F-4 of Fig. 2. Fig. 5 is a sectional plan view ofpart of the same on the line 5-5 of Fig. 4. Fig. 6 is a plan View of the improvement. Fig. 7 is a side elevation of the block frame and carriage with the file blank in position. Fig. 8 is a cross section of the same on the line 88 of Fig. 7. Fig. 9 is a similar view of the same on the line 9-9 of Fig. 7. Fig. 10 is an enlarged cross section of the hammer carrying the chisel, the presser foot and adjacent parts, the section being taken on the line 10-10 of Fig. 12. Fig. 11 is a similar view of the same on the line 11-11 of Fig. 12. Fig. 12 is a sectional plan view of same on the line l2-12 of Fig. 2. Fig. 13 is an end elevation of the chisel holder. Fig. 13 is a side view of part of the same looking in the direction of the arrow 13 in Fig. 13. Fig. 14 is a sectional plan view of the same on the line 14-14 of 1 Fig. 13. Fig. 15 is an end elevation of part of the intermittent feed mechanism for the carriage; and Fig. 16 is a like view of a modified form of the same.

011 the cap plate A of the column A, is held a swivel block B, in which is mounted to swing into any desired angular position the frame 0, carrying a carriage D, receiving an intermittent motion by a suitable mechanism from the main driving shaft E, ar-

ranged transversely and journaled in suitable bearings in the frame A provided with a base A secured to the cap plate A, at the rear of the swivel block B.

The main driving shaft E is provided with the usual fast and loose pulleys E, connected by a belt E with suitable machinery for imparting a continuous rotary motion to the shaft E. The latter is also provided near its rear end with a suitable fly wheel. On the front end of the main driving shaft E is secured a cam I adapted to reciprocate the hammerJ fitted to slide vertically in suitable guideways J 5 held on the frame A the lower end of the said hammer being provided with a chisel holder J 2 carrying the chisel J for cutting the file blank held on the top of the bed D, arranged on the upper surface of the carriage D.

The swivel block B is provided with a central bolt b which extends through the cap plate A and the projectionA and A formed on the under side of the cap plate A, as plainly shown in Fig. 3. Through the reduced projection A passes a key b also passing through the bolt b to secure the swivel block in place the under side of the flange B of the swivel block B, to hold the latter securely in place to prevent accidental side movement of the block when the machine is in operation.

The. upper surface of the swivel block B is conoaved as at b and on this surface fits the correspondingly-shaped bottom I) of a boss 0 forming part of the frame C and projecting downwardly therefrom, ems illustrated in Fig. 3. The frame 0 and the boss 0 fit between two vertically-extending arms 13 0f the swivel block B, and on opposite sides of the said frame are formed trunnions d engaging eye bolts d held in the upper forked end of the arms B and engaging apartition 0?, as plainly shown in Figs. 1 and 2, the nuts (1 for the bolts screwing against the under side of the partition d to securely hold the eye bolts in place. The axis of the trunnions d forms the center for the segmental contacting surfaces 1) and b, so that the frame 0 can be swung into any angular position, the frame turning on the trunnions d. \Vhen the frame is moved into the desired position it is locked in place byscrewing up the nuts (P, so as to exert a vertical downward pressure on the frame and its boss 0, to clamp the latter with its segmental bottom surface b' in contact with the top surface I) on the swivel block B. The trunnions d, together with the swivel bolt 6 are arranged in a vertical plane, passing through the hammer J and the chisel J, so that the several parts mentioned are in alignment with each other, and consequently, the blow of the chisel J will not tend to loosen the frame 0 when clamped to the swivel block B, as described.

From the arms B of the swivel block B extend horizontally the parallel side bars B connected with each other by a cross bar 13 at their outer ends, so as to form a guide for the frame 0 and a support for carrying part of the mechanism F, which serves to impart an intermittent motion to the carriage D held in the trough-like frame 0 fitted between the said side bars B and the arms B as plainly shown in the drawings. Itis understood that when the swivel block B is turned on the bolt 6 as a center, then the frame 0 moves with it, but has an independent adjustment for swinging it into a desired inclined position and locking it therein, as above described.

The intermittent feed mechanism F is arranged as follows: On the rear end of the main driving shaft E is secured a crank disk E on which is held adjustably, in a suitable slot e, the wrist pin f connected by a link E with the pawl carrying lever f (see Figs. 1, 2, 6 and 15) fulcrumed on the rear end of the cap plat-e A. On the arm f is held a spring pressed pawl f in mesh with a ratchet wheel f secured on a shaft a journaled in suitable bearings a held on the cap plate A.

0n the shaft a is movably arranged a bevel gear wheel a adapted to-be secured in place on the said shaft by a set screw or other suitable means and this bevel gear wheel a is in mesh with a bevel gear wheel a? secured on the lower end of a hub carrying on its upper end a second bevel gear wheel a and mounted to turn on a stud a secured on a bearing block a held adjustably on a rod a secured to the bearings a of the shaft a. The hearing block a besides carrying the stud a forms a bearing for the shaft (1 as will be readily understood by reference to Figs. 2 and 3. The block is secured in place on the rod a by a set screw or-other means. The

upper bevel gear wheel a is in mesh with a bevel gear Wheel o'adapted to be secured bya set screw or other means on a shaft 0 jou rnaled in suitable bearings c projecting frointhe rear bar 13 of the swivel block B. The bevel gear wheel a the block a carrying the double bevel gearwheel a, a and the bevel gear wheel 0 are held adjustable so as to enable the operator to shift the said gear wheels and block whenever the position of the swivel block B is changed to alter the angle of the cut made by the chisel J, it being understood that whenever the position of the swivel block B is changed the several gear wheels a 6,0,, and a, must be adjusted to remain in mesh. On the outer end of the shaft cis secured a gear wheel 0 in mesh with a like gear wheel a fastened on the outer end of a screw shaft 0 journaled at its outer end in a box 0 held in the cross bar B connecting the arms B with each other, as previously described. (See Fig. 3.) The other end 0 of the screw shaft 0 isjournaled in one side of the swivel block 13. The screw shaft 0 is adapted to be engaged by a half nut c mounted to slide on and turning with a shaft 0 journaled in the bar B and the swivel block B as plainly illustrated in Fig. 1. See also Figs. 3, 7 and 9. The forward end of this shaft 0 carries a handle 0 adapted to be taken hold of by the operator so as to turn the said shaft 0 to move the half nut c in or out of mesh with the screw shaft 0 The half nut c is fitted in a casing c mounted to slide loosely on the shaft '0 and the screw shaft 0 and on the top of this casing is arranged an arm 0 adapted to engage a follower D fitted to slide longitudinally in the bottom of the frame 0, the said follower being adapted to engage one end of the carriage D, as will be readily understood by reference to Fig. 3. Now, it will be seen that when the shaft E rotates, the crank arm E and link E impart a swinging motion to the pivoted arm fcarrying the pawl f so that an intermittent rotary motion is given to the shaft (1 by the pawl acting on the ratchetf. The intermittent rotary motion of the shaft a is transmitted by the gear wheel a to the gear wheel a. carrying on its hub the second bevel gear wheel a which is thus also rotated. The motion of the gear wheel a is transmitted to the bevel gear wheel 0 so that the shaft 0 receives an intermittent rotary motion and this motion is transmitted by the gear wheels 0 and c to the screw shaft 0 Now, when the half nut c is in mesh with the said screw shaft 0 at the time the latter has the intermittent rotary motion mentioned, then the casing c is shifted and consequenllyan intermittent slidin'g motion is given by the arm 0 to thefollower D and thus to the carriage D. The operator, by manipulating the handle o can, at anytime, throw the half nut c out of mesh with the screw shaft 0 so as to stop the intermittent motion given to the carriage D without stopping the main driving shaft E.

In order to impart a vertical reciprocating motion to the hammer J from the main driving shaft E the following device is provided: The cam I on the forward end of the main driving shaft E is engaged on its peripheral IIO engaged by a transversely arranged pin h? secured in the hub of the sprocket wheel h. The lower end of the sleeve h is mounted to turn in an arm 1' secured by aset screw 2' to the stem m of the hammer J. A fixed collar on the sleeve it engages the top of the arm 41 while a nut '6 screws on the lower end of the said sleeve h to abut against the under side of the said arm 1' so that on raising or lowering the latter the sleeve his likewise raised or lowered, without, however, disengaging the pin h On the head i of the screw 2' is secured a pin 11 arranged parallel to the screw and passing loosely through an aperture in the said arm t'. Thus, the screw '6 is prevented from turning in the sleeve h, but when the latter is rotated by rotating the sprocket wheel h, the screw 2' is raised or also passing over a second sprocket wheel it secured on a shaft 10 journaled in the bracket 9 and provided on its lower end with ahand wheel 10 under the control of the operator, so that the latter on turning the said hand wheel, can rotate the shaft 10 and the sprocket wheel in, whereby a like motion is transmitted to the sprocket wheel h by the sprocket chain is. The wheels k andk are held on the shaft 10 by nuts 70 When the chain It} is. turned, a rotary motion is given to the sleeve h by the pin h held in the hub of the said sprocket wheel, whereby the screw 2' is moved up or down to adjust the head 2' thereof, relative to the cam I, thus regulating the stroke of the hammer J. a

It will be seen that when the shaft E is rotated, the cam I moves the head i upward,

thus lifting the arm 11, the stem m and the hammer J until finally the head "i drops off the end of the cam in the recess 1 of the same to permit the hammer J to fall. The downward motion of the hammercan be increased or diminished by a spring 9 the tension of which can be increased or diminished by a mechanism presently to be described. On the upper reduced end m of the shaft m, is held loosely a collar g on which presses the lower end of the spring g engaging at its upper end the collar 9 forming the head for the screw rod g screwing in the bevel gear wheel 93 journaled in a bracket 9 secured to the frameA at the upper end thereof. On the head 9 is also secured a pin g extending parallel to the screw g and fitted to slide vertically in an aperture formed in the bracket g. Thus, the screw rod 9 is prevented from turning but when the bevel gear wheel 9 is rotated, the screw rod is raised or lowered so as to compress the spring 9 or to permit the same to uncoilto reduce the tension according to the direction in which the bevel gear wheel g is rotated. The gear wheel 9 is in mesh with a bevel gear Wheel 9 held on a shaft g journaled in suitable bearings on the bracket g and carrying at its outer end a bevel gear wheel 9 in mesh with a bevel gear wheel 9 secured on the upper. end of a shaft 9 journaled in suitable bearings in the brackets g and g. On the lower end of this shaft g is secured a hand wheel 9* under the control of the operator to enable the latter to conveniently turn the shaft 9 to rotate the shaft g by means of the gear wheels g and 9 The rotary motion of the shaft 9 causes the gear wheel 9 to turn as the latter is in mesh with the gear wheel 9 on the shaft. g Now, by turning the hand wheel 9 in one direction, the screw rod g carrying the head 9* is raised to decrease the tension of the spring 9 and when the hand wheel 9 is turned in the opposite direction, the screw rod is caused to move downward so that its head 9 compresses the spring 9 to increase the tension thereof. By this arrangement the blow of the hammer on its downward motion can be increased or diminished to regulate the depth of the cut made on the file blank by the chisel J.

The chisel holder J 3 carrying the chisel J is supported on the lower end of the hammer J and is yieldingly mounted as presently to be described, the said holder being shown in detail in Figs. 3, 10, 13, 13 and 14. The holder J 2 is provided with a recessed body 0 in which is fitted the shank of the chisel J secured in place by a set screw 0 screwing in a block J held in the horizontally-disposed slide J 4 forming part of the body portion 0, as plainly shown in Fig. 14. The upper end of the body portion is connected by pivots 0 with the heads 0 of bolts 0 extending upwardly through the hammer J, nuts 0 screwing on the upper end of the said bolts to hold The slide thelatter in place in the hammer. J is fitted in the guideways J which also form the guideways for, the hammer J. On loosening the bolt 0 from the chisel shank the block J can be removed from the slide J 4 so as to form an opening in the latter for the convenient removal of the chisel J in case the latter is to be sharpened or exchanged for a new or difierent one, as the case may be. Against the rear end of the body 0 and near the lower end of the same presses the free end of a spring 0 secured to the hammer in the rear wall of the recess containing the body 0. (See Fig. 10.) Thus,

the body 0 has a slight yielding motion laterally, it being understood that the body can swing from the pivots 0 In order to hold the file blank on the bed D a presser foot 0 is provided, arranged in an angular position, as indicated in Figs. 3 and 10, the said presser foot engaging the top of the file blank closest to the cutting edge of the chisel J. The presser foot 0 is sesured by ascrew or other means to the lower end of a presser bar G pivoted on a bolt m held vertically adjustable in a recess m formed in the arm A projecting from the frame A and carrying the hammer previously described.

In order to cover the recess m I provide a plate m fitted against one side of the arm A and on which screws the nut of the bolt m. The upper end of the presser bar G carries a bolt m engaging a segmental slot formed in a slide G fitted to slide vertically in suitable bearings formed on the arm A The slide G is pivotally connected by a bolt h with a lever G pivoted on a bolt k car-f ried by a bracket h held-vertically adjustable on the arm A of the frame A see Figs. 2 and 12. On the front end of the lever G hangs a rod .9 supporting a weight K to press the presser foot 0 with suflicient force on top of the file blankto hold the latter in place.

The downward motion of the lever G is limited by a stop bolt n screwing in a lug "n? forming part of a slide block l l fitted to slide in suitable bearings '0 formed in the arm A to one side of the hammer J, as plainly shown in Fig. 12. On the front of the slide block H is arranged a flange u adapted to be engaged by a cam t formed on the pivot end of the lever H fulcrumed on a bolt t fastened to the arm A. The cam t extends about at right angles to the lever H, of which it forms part, and when the said lever is in a vertical position, as illustrated in Fig. 11, then the cam 13' extends horizontally and permits the slide block H to pass into a lowermost position. When, however, the lever 11 is swung into a horizontal position as illustrated in Fig. 1, then the cam acts on the flange u and thus imparts an upward sliding motion to the slide block H which latter, by its bolt or set screw n, imparts an upward swinging motion to the lever G, so that the presser foot 0 is raised oi the file blank. At the same time, the hammer J is raised by an extension H on an arm l-I held adj ustably on the slide block H said extension engaging a lug m formed on the front face of the hammer J. In order to make the arm H adjustable, I provide the same with a vertically-disposed slot engaged by a bolt n screwing in the block H The file blank rests on the bed D and is adapted to engage with its shank an apertured lugr secured by a screw or other means tothe top of the carriage D. The shank is also adapted to engage pins placed on the bed D near the lower end thereof to engage the curved portion of the widest part of the shank so as to hold the file blank straight on the bed. The under side of the carriageD is curved and fits loosely in the correspondingly-shaped top of the frame C, as illustrated in the drawings particularly with reference to Figs. 8 and 9.

On the upper end of the carriage D is secured a handle D adapted to be taken hold of by the operator so as to turn the carriage D in the frame O according to the shape of the file blank supported on the bed D. It

is understood that this turning of the carriageD is necessaryin case semi-circular, circular or other curved forms of file blanks are to be cut.

The operation is as follows: When the several parts are in the position illustrated in Figs. 1, 2, 3 and 6, and a rotary motion is given to the main driving shaft E, then the cam I thereon imparts alifting motion to the hammer J to raise the cutting edge of the chisel 'J a suitable ,distance above the file blank supported on the bed D, the latter then being in a lowermost position. As soon as the head '5 drops ofi the abrupt end of the cam I then the hammer J slides downward with the force regulated by the tension of the spring g as previously explained. The hammerJ onits downward stroke forces the chisel J to make the cut on top of the file blank, it

the screw rod 0 so that a forward feed is given to the nut 0 the casing 0 and the arm a, whereby the follower D is pushed forward in the frame 0, and thusa like forward movement is given to the carriage D carrying on its bed D the file blank. Thus onthe next downward stroke of the hammer J the chisel J again makes a out, which is parallel to the cut previously made, and the above described operation is repeated until the end of thefile blank is reached. When it is desired to make the cross cut on the'file blank the operator adjusts the frame 0 to the right in the manner previously described, and at the same time adj usts the several gear wheels on the shafts a and c to retain the said gear wheels in mesh. At the same time the operator swings the handle a upward to disengage the nut c from the screw shaft 0 to permit of sliding the casing 0 back to its outermost position to permit a downward sliding of the carriage D and follower D to move the upper end of the file back under the chisel J, the latter, of course, being held in an uppermost position by the operator having previously moved the lever H, into a horizontal position as indicated inFig. 1, to hold the chisel and presser foot above the file blank. When the adjustment has been made, then the machine is again started and the above described operation is repeatedso that parallel cross cuts are made on the top of the file blank relative to the cuts previously made; see Fig. 6. In case a rounded file blank.

is to be out then the operator by the handle D turns the carriage D correspondingly, to cause the chisel to strike the file blank at the proper place. The intermediate feeding of the carriage D, however, is the same as above, and the bed is shaped to correspond with the shape of the blank to securely hold the latter in place.

It is understood that when a file has been cut and a new blank is to be inserted, the operator need not stop the driving shaft E, as by the lever H the presser foot and hammer can be set out of action for the time bemg, and the nut 0 can be disengaged to return the carriage D carrying the file blank to make the exchange of file blanks by manipulating the lever o When, however it is desired to stop the machine entirely for changing the position of the frame 0, as previously described, when making the second diagonal out, then the operator shifts a shipper rod 6 mounted to slide in suitable bearings and provided with a handle e as illustrated in Fig. 2. The shipper rod e then shifts the belt E from the fast pulley to the loose pulley on which it remains until the changes are made.

As illustrated in Figs. 3 and 15, a single cam I 'is used but I may employ a double cam I as illustrated in Fig. 16. In this case, I dispense with the mechanism connecting the shaft E with the shaft 0. and employ instead thereof, the pulleys M and N secured on the shafts E and a respectively. A belt 0 passes over the said pulleys to transmit the rotary motion of the shaft thereof to the shaft a continuously.

It is understood that with this improved file cutter, perfectly cut files are produced simulating to a great extent, the hand made file. The machine is capable of turning out a large number of files in a comparatively short time, and is perfectly under the control of the operator.

Ilaving thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. A file cutting machine comprising ahorizontally adjustable swivel block, having a concave upper face, aframe mounted to swing in the said swivel block, and having a convex pro ection on its lower face fitting the said concavity; the axis of the frame being the center of the are described by said convex and concave faces a carriage having anintermittent sliding motion in the said frame, and a reciprocating hammer adapted to carry the chisel and operating over the said carriage to produce cuts onthe file blank, substantially as shown and described.

2. A file cutting machine provided with a hammer having a reciprocating motion, and a chisel holder held on the said hammer and comprising a holder body adapted to receive the chisel and fitted in a recess in the hammer, and vertically extending bolts held in the said hammer and pivotally connected at their heads with the said holder body, sub: stantially as shown and described.

8. A file cutting machine provided with a hammer having a reciprocating motion, and a chisel holder held on the said hammer and comprising a holder body adapted to receive the chisel and fitted in a recess in the hammer, vertically extending bolts held in the said hammer and pivotally connected at their heads with the said holder body, and a spring held on the said hammer and pressing against the said pivoted holder body, substantially as shown and described.

4. A file cutting machine provided with a hammer having a reciprocating motion, and a chisel holder held on the said hammer and comprising a holder body adapted to receive the chis'el and fitted in a recess in the hammer, vertically extending bolts held in the said hammer and pivotally connected at their heads with the said holder body, a spring held on the said hammer and pressing against the said pivoted holder body, at its inner sidebelow its pivots, and a block held removably in the front open side of said holder body and carrying a set screw adapted to engage the chisel, substantially as shown and described.

5. In a file cutting machine, the combination with a swivel block provided with eyebolts, of a frame having trunnions mounted in the said eye-bolts, a carriage fitted to slide and to turnlin the said frame, a bed held on the said carriage and adapted to support the file blank, a follower fitted to slide in the said frame and engaging the said carriage at one end thereof, an arm held on a casing mounted to slide and engaging the said follower, a revoluble screw shaft, and a half nut held in the said casing and adapted to engage the said screw shaft, substantially as shown and described.

6. In a file cutting machine, the combination with a swivel block provided with eyebolts, of a frame having trunnions mounted luble screw shaft, a half nut held in the said casing and adapted to engage the said screw shaft, and means, substantially as shown and described, for swinging the said half nut into or out of contact with the said screw shaft, as set forth.

7. In a file cutting machine, the combination with a shaft, of a bevel gear wheel adjustable thereon, a block mounted to slide on the said shaft and adapted to be locked in place on a suitable rod, the said block carrying a pin, a double bevel gear wheel mounted to turn on the said block-pin and having one of its bevel gear wheels in mesh with the said first-named bevel gear wheel, a second,

single bevel gear wheel in mesh with the sec ond bevel gear wheel of the double bevel gear wheel, a second shaft on which the said second bevel gear wheel is held adjustably, and ascrew shaft geared with the said second shaft, substantially as shown and described.

8. In a file cutting machine, the combination with a shaft, of a bevel gear wheel adjustable thereon, a block mounted to slide on the said shaft and adapted to be locked in place on a suitable rod, the said block carrying a pin,a double bevel gear wheel mounted to turn on the said block pin and having one of its bevel gear wheels in mesh with the said first-named bevel gear Wheel, a second, single bevel gear wheel in mesh with the second bevel gear wheel of the double bevel gear wheel, a second shaft on which the said second bevel gear wheel is held adj ustably, a screw shaft geared with the said second shaft, and a swivel block provided with an extension frame carrying the said screw shaft and the said second shaft, substantially as shown and described.

9. In a file cutting machine, the combination with a shaft, of a bevel gear wheel adjustable thereon, a block mounted to slide on the said shaft and adapted to be locked in place on a suitable rod, the said block carrying a pin, a double bevel gear wheel mounted to turn on the said block pin and having one of its bevel gear wheels in mesh with the said first-named bevel gear wheel, asecond, single bevel gear wheelin mesh with the second bevel gear wheel of the double bevel gear wheel, a second shaft on which the said second bevel gear wheel is held adj ustably, a screw shaft ond shaft, and a carriage adapted to support.

the file blank, a frame pivoted to the said swivel block and in which the said carriage is fitted to slide, and a half nut engaging the said screw shaft and mounted in a casing and having an arm for shifting the said carriage, substantially as shown and described.

10. In a file cutting machine, the combination with a presser foot held on a pivoted presser bar, of a slide having a segmental slot near its upper end, an adjusting bolt held on the said presser bar, and extending through said segmental slot, a pivot connecting the slide and presser bar below said segmental slot and a lever pivotally connected with the said slide, substantially as shown and described.

11. In a file cutting machine, the combination with a presser foot held on a pivoted presser bar, of a slide having a segmental slot near its upper end engaged by a bolt held on the said presser bar, a pivot bolt connecting said presser bar and slide below said segmental slot and extending through a vertical slot in the frame a lever pivotally connected with the said slide, and a weight held on the said lever to hold the presser foot forcibly in contact with the file blank, substantially as shown and described.

12. In a file cutting machine, the combination with a hammer mounted to slide and provided with a stem, of aspring pressing on the said stem, a device, substantially as described, for regulating the tension of the said spring, an arm or bracket secured on the said stem, a sleeve mounted in the said bracket, a bolt screwing in the said sleeve and provided with a head adapted to be engaged by a cam, the said head being also provided with a pin loosely engaging the said bracket to prevent turning of the bolt, and means, substantially as described, for imparting a turning motion to the said sleeve to adjust the bolt head relative .to said cam, as set forth.

13. In a file cuttfug machine, the combination with a revoluble cam, of a bolt provided with a head adapted to be engaged by the said cam, a sleeve in which screws the said bolt, a bracket in which the said sleeve is mounted to turn, the said bracket being adapted to be fastened to a hammer stem, apin projecting from the said bolt head, and extending loosely through the said bracket, and a sprocket wheel mounted to turn and through which passes loosely the said sleeve, the said sprocket wheel carrying a pin engaging a slot in the said sleeve, substantially as shown and described.

14. In a file cutting machine, the combination with a revoluble cam, of a bolt provided with a head adapted to be'engaged bythe said cam, a sleeve in which screws'the said bolt, a bracket in which the said sleeve is mounted to turn, the said bracket being adapted to be fastened to a hammer stem, a pin projecting from the said bolt head and extending loosely through the said bracket, a sprocket wheel mounted to turn and through which passes loosely the said sleeve, the said sprocket wheel carrying a pin engaging a slot in the said sleeve, and means for revolving the said sprocket wheel,to cause vertical adj ustment of the said bolt and its head rela tive to the cam, substantially as shown and described.

15. In a file cutting machine, thecombination with a hammer having a reciprocating motion and provided with a chisel holder adapted to carry the chisel, of a slide block having a slotted vertically adjustable :arm and a flange, a set screw extending through said slot into the block, and a cam lever adapted to engage the said flange to raise the said block, to move the arm thereon into contact with a projection on the said hammer, sub stantially as shown and described.

16. In a file cutting machine, the combination with a hammer having a reciprocating motion and provided with a chisel holder adapted to carry the chisel, of a slide block having a slotted vertically adjustable arm and a flange, a set screw extending through said slot into the block, a cam lever adapted the said lever, and a Presser bar connected to engage the said flange to raise the said with the said slide and carrying a presser block, to move the arm thereon into contact foot, substantially as shown and described.

with a projection on the said hammer, a ver- FREDERICK W. LOWE. tical set screw held on the said slide block, a Witnesses: weighted lever adapted to rest on the said HARRY R. GLENN, set screw, a slide pivotally connected with E. DUDLEY.