US1103941A

US1103941A - Knife-grinder.

Info

Publication number: US1103941A
Application number: US83489414A
Authority: US
Inventors: Robert B Cochran
Original assignee: Morgans & Wilcox Manufacturing Co
Current assignee: Morgans & Wilcox Manufacturing Co
Priority date: 1914-04-28
Filing date: 1914-04-28
Publication date: 1914-07-21
Anticipated expiration: 1931-07-21

Description

R. B. GOGHRAN. KNIFE GRINDER. APPLIOATION FILED APR. 23,1914.

1,1 03,94 1 Patented Ju1y 21, 1914.

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R. B. COCHRAN. KNIFE GRINDER. APPLICATION FILED AP11.zs,1914.

1,1 03,94 1 Patented Jul-y 21, 1914.

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ROBERT IB. COCHRAN, 0F WASHINGTON, NEW.'IEIRSEY, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO MORO-ANS &; WILCOX MFG. COMPANY, 0F MIDDLETOWN, NEW YORK, A CORPORATION OF NEVI" YORK.

KNIFE GRIN DER. i

Reling of application Serial No. 491,571, led

To all whom it may concern Be it known that I, ROBERT B. Gooi-IRAN, a citizen of the United States, residing at lVashington, in the county of Warren and State of New Jersey, have invented a certain new and useful Improvement in Knife-` Grinders, of which the following is a specification.

The invention relates. to machines for grinding knives and is intended more particularly for service in grinding the knivesy The invention consists in certain novel form of the invention as adapted for operat-4 ing upon the knife of a papeicuttingy machine.

Figure 1 is aplan view of the machine in place on the table of a paper cutter. Fig. 2 is a corresponding front view, a portion of the table being shown in vertical section.

Fig. 3 is a plan view of a portion of the' table showing the groove and the engaging means therein. F ig.` 4 is an end view of the machine with the grinding disk inclined as in service, and showing a portion of the table in transverse section. The remaining figures are on a larger scale. Fig. 5 is a transverse vertical section through the machine and a portion of the knife and table. Fig. 6 is a side elevation of the carriage and its parts alone. Fig. 7 is a corresponding rear view. Fig'. 8 is a plan or top view of the same. Fig. 9 is a vertical section through the table and a portion of the machine, with certain parts of the latter in elevation, showing the means for holding the grinding disk at the desired angle.

specification of Letters Patent.

Patented July 21, 1914.

April 22, 1909. This application filed April 28, 1914. Serial No. 834,894.

Similar letters of reference indicate the same parts in all the figures.

The paper-cutting machine may be understood to be of yany ordinary or approved type having the usual table M, a vertically reciprocated knife M1 and groove m in which the edge of the knife is received at the termination of the cuttingstroke. The op-` erating and other parts, not shown, may be as usual.

The improved grinding machine has a bar A adapted to lie in the groove m and engage strongly therein by the wedging action of a block B grooved to match to a tapered or inclined feather or rib A1 on the bar. The latter carries a frame C having at each end a vertical flange or way C1 curved con- `cavely on its upper face to receive corresponding convex flanges D1 D1 yon a carrier D and permit the carrier to rotate within prescribed limits upon the curved ways C1 C1 in determining its angular position and phefparts carried thereon relatively to theni e.

Upward extensions VD2 from the carrier support a longitudinally extending bar D3 having on itsedges straight parallel ways D4 D4 and a rack D5 between such ways; the latter support and guide a traveling carriage F in which is loosely journaled a shaft G' carrying a pinion G1 in mesh with the rack D5 and on its inner overhung end an emery wheel N or other grinding disk. The carriage is reciprocated by the hand of the `operator upon a handle G2 on the upper face of the carriage, and as the pinion is in mesh with the relatively stationary rack D5 the. reciprocating motion rotates the grinding disk N alternately in opposite directions during the travel. By moving the carrier inthe curved ways C1 C1 the angle of the face vof the grinding disk against the knife may be varied to conform to the' bevel forming thecutting edge ofthe latter, and lwhen thus adjusted is held by clamps E E, one at each end, overlapped upon the curved upper yfaces .ofthe flanges Dl D1 and compressed thereon by bolts E1 El, thus inducing sufficient friction to hold the carrier re` liably. The curves of the ways C1 C1 are identical and each is an arc of a circle they lcenter of which is shown as lying in the 5,0 tached plane of the knife edge. Thisarrangement is preferable but may be varied.

vA hand lever l fulcrumed on the frame C at I1 is pivotally engaged at B1 with the 5 vblock B and affords conveniently presented means for engaging and disengaging the bar A and block B in the groove m in shifting the machine to a new position along the knife and in removing the machine at the completion of the grindingoperation. To permit, the frame C to be adjusted relatively.

to the groove m to insure parallelism of the ways D1 D1 with the knife, in case thewalls of the groove and face of the knife be not" 15. exactly parallel, the attachment of the frame to the bar A is made by means of bolts C3 Cs extending through open slots or notches 0 0,

inthe horizontal "flanges C2 C2 of the frame into the bosses A2 A2 at the endsv of the bar,

thus allowing Vthe frame to be shifted slightly upon the bar at either or both ends as may be required in securing absolute alinement.

The grinding Vdisk is held in yielding contact with the knife by a spring H on the carriage abutting at one vend against the head H2 ofa rod H1 and at .the other against a* web-F1 on the'carriage; the rod extendsv through the web and through a lever H3 and is' threaded to receive av thumb-nut fH5 by 1.3.0, whichthe tension of the springvmay be vatated and the swell of the cam thus made to` contact'with the inner face ofthe levenH3 4.5. and force it outwardly sufficiently to permit the disk to leave the knife. y n

At eachend of the rack D5 is a sliding abutment K mounted in ways ,7a It* and subjectl to the force of the springs K1' K11atatyone end to the under face of the abutments and at the other'to the under face of the longitudinal bar D1; the function`r of the abutments is to cushion the carriage at.

the ends of itsreciprocating' movements and 5.5 to Vprevent the carriage leaving .then ways D D4'. In the-operation of grindinga knife, the stick of wood usually em loyed to receive'the knife edge is removed fiom the groove m, 60. the cam J turned toretract the grinding disk, andthe machine placed on the table.

M with the locking lever I thrown to the right to move the block B toward the; narrow.

' end ofthe inclined rib A1 on the barA'; the latter with the block is then inserted in the .groove and the .lever thrown tothe left to insure strong frictional engagement therewith.l The clamps E E' are then loosened and the carrier turned on the curved ways C1 C1 to presentthe face of the disk at the 70 proper angle to the bevel ofthe knife; the

. clampsare again tightened and the carriage is then traversed along the face of the bevel and. 1f the'line of .travel is foundv to be Vnot parallel with the knife the proper adjustment of the frame C on the bar A is made by means `of thebolts C3 C1. The cam J is then turned to permit the spring H to act upon the shaft .Gr andthe carriage reciprocated with the` disk N in contact with the knifego until' lthe latter is suiiicientlyxground. If'- the knife be longer than vthe travel of the:

ydisk the lockingl lever is thrown tov loosen the bar A and block B andthe machine is then shifted and locked in position to treat a new portion of the knife. lhen the opera tion is completedpthe machine .is removed ywithout changingits adjustments and may `be re-lnstalled when 'required ready to serve on the same paper cutter without readjustment.' Y e Importance is attached to the features of fastening themachineto the cutter-bed by engagement with thegroove therein, and it will be understood thatother means than the mechanism shown may bexemployed for inducing the strong frictional engagement required. 1

Although the invention is described as applied in sharpening the knives of paper-cut 1 00 ting machines it will be understood that it` will serve in other grinding operations; to which it may be adapted. Gti er modifications may be made in the forms and proportions of the parts `withoutdeparting y,from the invention, and portions may be used` without the whole.`

l claim 1. In a grinding machine of thecharacter set forth adapted to operate upon a knife of a paper-cutting machine, asupporting frame. detachably .mounted over saidv machine, grinding mechanism mountedthereon, a bar pendent from such supporting frame and receivable within a groove on the cutting ma` 115 chine frame, and a cooperating member car- V ried by the grinding machine frame andalso. receivable within said groove, said members having a .wedging action and engageable with thel walls'of said groove lfor holding 12o the .grinding machine in. operative relation totheknife. n.

2. In a grinding machine, a frame, curved ways thereon, a carrier mountedV in said ways and. movablethereon to vary its ver-,125 tical angular positionprelatively thereto, a carriage. mounted. on said carrier 'andy mov? able longitudinally thereof, a, shaft jour-I ynaled in said carriage, a grinding disk on said shaft, a rack' on said. carriergfa-fpmion v130 on said shaft in mesh With said rack, and means for holding such machine in operative relation to a knife to be ground.

3. In a grinding machine, a frame, curved Ways thereon, a carrier mounted on said Ways and movable thereon to vary its vertical angular position relatively thereto, means for holding said carrier in such angular position, a carriage mounted on said carrier to reciprocate thereon, a shaft journaled in said carriage with freedom to move axially, a grinding disk on said shaft, a rack on said carrier, a pinion on said shaft in mesh with said rack, means for holding such machine in operative relation to a knife to be ground, and means for presenting said disk in yielding contact with such knife.

4. In a grinding machine, a frame, curved Ways thereon, a carrier mounted on said Ways and movable thereon to vary its vertical angular position relatively thereto, means for holding said carrier in such angular position, a carriage mounted on said carrier to reciprocate thereon, a shaft j ournaled in said carriage With freedom to move aXially, a grinding disk on said shaft, a rack on said carrier, a pinion on said shaft in mesh With said rack, means for holding such machine in operative relation to a knife to be ground, means for presenting said disk in yielding conta-ct With such knife, and adjustable means for varying the force of such yielding contact.

5. In a portable grinding machine adapted to operate upon the knife of a paper-cutting machine, a bar having aninclined face, a block having an oppositely inclined face, said bar and block adapted to be received in the groove of said paper-cutting machine, means for moving said bar and block relatively to each other to engage or disengage said groove, and grinding mechanism carried by said bar.

G. In a portable grinding machine, adapted to operate upon the knife of a paper-cutting machine, a bar having an inclined face, a block having an oppositely inclined face, said bar and block adapted to be received in the groove of said paper-cutting machine, means for moving said bar and block relatively to each other to engage or disengage said groove, a frame mounted on said bar, means for adjusting said frame horizontally relatively to said bar, a carrier on said `on said Ways, clamps for holding said carrier in the desired angular position, longitudinal Ways on said carrier, a carriage mounted on such carrier to be reciprocated along said longitudinal Ways, yielding abutments at the ends of said carrier to cushion the impact of said carriage, a shaft journaled in the latter, a rack on said carrier, a

pinion on said shaft in mesh With said rack, j

and a grinding disk on said shaft.

8. In a grinding machine of the character set forth, a carrier having Ways parallel with the knife to be ground, a carriage mounted on said Ways and arranged to be reciprocated thereon, a shaft journaled in said carriage with freedom to move axially therein, a grinding disk on said shaft, a rack on said carrier, a pinion on said shaft in mesh With said rack, a lever pivotally mounted on said carriage, a spring actingy upon said lever to force the latter against the end of said shaft, and means acting in opposition to the force of said spring to relieve said shaft from such spring pressure.

9. In va grinding machine of the character set forth, a bar adapted to engage the groove of a paper cutting machine, a frame supported on said bar, and adjusting means for .varying the horizontal angle of said frame relatively to said bar, curved Ways on said frame, a carrier mounted on such Ways and movable thereon to vary its vertical angle relatively thereto, means for holding said carrier in the desired position, a reciprocating carriage on said carrier, a shaft journaled in said carriage and rotated by such reciprocations, and a grinding disk on said shaft.

In testimony that I claim the invention above set forth I aiiix my signature, in presence of tvvo Witnesses.

N. F. SoUTHWoR'rH, IIARRY CHRISTINE.

Copies of this patent may be obtained for ive cents each, by addressing Athe Commissioner of Patents, Washington, D. C.