US1439889A - Cutlery-grinding machine - Google Patents

Description

F. PIHEMMING ET AL.

CUTLERY GRINDING MACHINE.

FILED SEPT 27.1921

Dec. 26, 1922.

Dec. 26, 1922.

NG ET- AL.

F. P. HEMMI CUTLERY GRINDING MACHINE.

3 SHEETS-SHEET 2- FILED SEPT. 27,1921.

I N VEN TORS A TTORNE Y.

Dec. 26, 1922.

F. P. HEMIVIING ET AL.

CUTLERY GRINDING MACHINE.

3 SHEETS-SHEET 3- FILED SEPT. 27,1921.

III [III llll l talented tilt-u,w 23h, ltiilz,

j 'uurrirn stares PATENT nings,

FRANK HEMIilIING- AND CARL HENRY HEMMING, OF NEW HAVEN, CONNECTICUT.

CUTLERY-GRINPING MTACHINE.

Application filed September 27, 1921. Serial N0. 503,578.

Tocll'whomizfmay concern: I

, Be it known that we, FRANK P. HEMMING and CARL H. IIEMMING, citizens of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and use ful Improvements in Cutlery-Grinding chines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains, to make and use the same.

This invention relates to certain improvements in cutlery grinding machines. In carrying out the invention, certain well known elements relating .to machines of this character are employed, such, for instance, as an emery wheel, preferably of the hollow or cup shaped type, rotatably mounted in close proximity to the blade to be ground, said blade being mounted on a holder attached to a reciprocating member having a quick idle movement in one direc tion, 'andaslow' return movement for grinding; also the employment of well. known planet gear mechanism to effect the slow and rapid movement of the reciprocating member.

One of the objects of the present inven-' ported carriage, said carriageadapted to:

have a movementto and from the grinding wheelv A coarse pitch screw is ournaled in the carriage carrying a nut adapted to,

engage with adjustable mechanism on the underside of the sliding plate to reciprocate said plate. At the termination oi? the quick idle travel of the sliding plate it is l1]'l})l-' live that it be brought firmly against a stop in order to positively locate the shoulder o'lv the knife blade with respect to the grinding wheel. For this purpose, the nut allowed an idle travel beyond the predetermined p p shaft 5 carrying the emery grinding wheel idle travel of the slide, and a reverse idle travel while the carriage is being moved toward the grinding wheel.

Another improved feature consists in assembling the planet gear mechanism within a pulley, and mounting the pulley on the shaft of the slide actuating screw to serve both as a driving pulley and a balance wheel to maintain a steady and continuous rotation of the screw. 1

Referring to the accompanying drawings wherein the same reference characters in dicate like parts throughout the several views:

, Figure 1 represents a plan view of the machine showing the carriage in its outer position with respect to the grinding wheel, and the sliding plate located at the termination of the idle travel, also sectional view of the handle lever;

Figure 2 is aside elevation of the ma chine looking in the direction of arrow a, Figure 1;

Figure 3 is a view of the machine looking in the direction of arrow 7), Figure 1.;

1F igure 4 is a plan view of the carriage with the sliding plate removed, also seetional view of the driving and loose pulleys mounted on the screw shaft, and sectional view of the handle lever;

Figure 5 is a detail elevation of the driv ing pulley and planet gear mechanism with the loose pulley removed;

Figure 6 is a broken view of the neck of the carriage andscrew shaft, and sectional view of the driving pulley with the loose pulley removed, showing the planet gear mechanism in position for a slow return movement of the sliding plate to grind;

Figure 7' is a detail inside view of the sliding plate;

Figure 8 is a sectional view of the sliding platoon line 8, 8, of Figure 7, and broken view of the sliding plateactuating screw, and i v 7 Figure 9 is a broken view of the slide actuating nut, part of the slide mechanism, full view of the follower and its siiipport showing the roller carried by the nut "forced to oneside to permit the return of the carriage,

The principal common features incidental to machines of this character comprise the bed 1., slide 2, adjusting screw 3 therefor, slide standards 4 in which is journaled the 6, and the tight and loose pulleys 7 and 7 8 is a plate adapted to be set at any angle with respect to the grinding wheel and is secured in any of its adjusted positions by means of the bolts 9 projecting from the bed 1.

The carriage 10 is provided with the foot 11 pivotally supported at one corner on the stud 121, Figure 3, of the base plate 8 and it projects through the huh 13, Figures 1 and 4, of the carriage foot 11.

The shaft ends 14, 15, of the screw 16 are journaled, Figure4, in the ends oi the carriage. The latter shaft carrying the driving pulley 17 with its internal planet gear mechanism and. adjacent-clutch mechanism, pi'esefntly tohe more fully described.

17% is. a loose pulley adjacent to pulley 17. 18 is a nut operatively mounted on the screw 16 having the lug 1-9'adapted to effect a longitudinal reciprocating movement of the sliding plate 20,1nounted on the oar-1 riage, by its contact with'the adjustahle r od 21, Figuresi and 8,,mounted. in the bracket 22, and the rod- 23 01% the bracket 24 located in alignment; {with the rod 21. 253isa sprang on rod? 23; adaptedv tohecompressedthrough;

the medium of the sleeve 26 when, the lug 19cOntacts with the end ofthe rod,g as

shown in Figure 8. Thewpositioir of rod 23 and sleeve 26. are adjustedby means of the j am nuts 27, 28 mounted on the endsof said rod. 29 is the knil elolade holder which may beof any desiredv constructionbest adapted to support the blade to he-gnound.

30 is a bracket projecting :fn'ofm the nut. 18, carrying the, lever-x31 pivoted thereto, and is normally held against the pi Ih'32, Figure 4, of the hraclret'hy the spring '33. 34 is a roll in the outer end oi th'e lever I adapted to. travel along the: face of the former 35 during the travel of the nut 18-. The former being reinov'ahly mounted. 1n

the standard 36 attached, Figures 1', 2, and;

8, to the stationary plate 8; 1 I

The pulley 17, Figures 4, 5, and 6, has the arm 37 journa-led 'on the shaft end 15 of screw 16', The gear 38 is fast-to.

the shaltaandthe gear 39, with itsclutch sleeve 40, is journaled on the shaft. 461: 2L11d 42 are short shafts anchored in. the pulley arm and on which are j ourn'ale'di the pinions 43, 44 45, and 46, meshing witlrgears- 38 l Vhen the clutch pins 47 of the and 39. v gear 39, and theclutch pins 48 01 the'pulley arm are engaged, Figure 4; and the clutch. this 49"oit the clutch sleeve are disei'i'gaged from the pin 1 50*o't the carriage extension 51;,the' gears anidpinions-Willbe locked, to the pulley and all rotate together for afast rotation of thescrew 16to'- 1111- part a rapid 4501 m idle travel of the I Wllten* thef clutch pli1is-49 are; locked to the stationary pin 50- ofthe oarria-ge, and; the. clutch pins1:47,,=48; disen sleeve-40, Figureojthe gear -39 will remain sta tlbn'ary, and i the rotation oi 'the' pulley- 171 wi 11- carry the-pin ions 43', 44, 45-, and46,

rod, is operatiively supported in the- standards 56, 57,;ofthe1carriage'foot 11. As'the lever 52 is located above the shipperrod 54,1 itiisv connected therewith through the medium of i the block 58 and the 'short I'OCl59L, v

Theopera'tion of the machine is as, f0llowscv 1 'At the terminationyof the forward idle travel; of the sliding plate 20,. the, lug 60, Figure 7, oil the plateshould be" forcibly brought against: the stop 61, Figure- 4, of

the carriage-10. 'Ihis; stop is. intended to locate the posit'ioni ot'the: shoulder; of a;

knife blade with respect to-the= corner of the grinding wheeL so' that the corner: of

the wheel will always engagea'said shoul der before the grindingoperation of the nest of. the blade begins. I

There are, however, several causes: operatingto pizevent thepositive contact of the lugg 60 with the stop" 61, suc hyfor. instance,

as. the lost motion due to the wear of the mechanism for actuatingthe reciprocating slide, or undue tlghtness; or lack of lulorication of the slide willcause' it to lag he hind and fall short of the proper halting point. i

To insure-positive engagement of the slide wlth the carriage stop, thenut 18* of the screw will continue its inwardwtravel beyond the prcdeteninined travel of the slide, and, n doing so, will compress the spring. 25, Figure 8, through; the medium of the lug 19 of. the; nut, as before mentioned. DUPlnglJlHS spring oompnession, the trip 62,

carried by thebracket 30- of the nutQFig ure 4, will engage the adjustablestop 630'11 rodi 54 to;reverse' said rod and engage the clutchpins 49, 50, 'ior apre'limin'airy slow idle reverse-travel of thenut. i

. This idle reverse movement of the not will bring theroll 34 first in Contact with the incline 64 oi the former- 35. As the roller ls-moved up thisincline, it crowds the carri e'e" 10* gradually towarchthie grinding wheel in the direction of'arrow 0, Figure 1, which graduahmovement of the carriage is essential Where a large amount of stock has to" be removed from a blade, as it en j ables the gnin'dingwheel to gradually Work its way to the proper "depth into the stock of the blade" without apparent injury to the sharp cornei o'l"the-wheel, result that could not be obtained were the carriage suddenly thrown its ultimate distance at once.

As soon as the roll 34 has reached the straight face 35 of the former, the idle travel of the nut will cease, and its lug 19 will contact with the rod 21 of the slide and carry said slide slowly back during the grinding operation, and when said grinding operation is completed, the trip 62 will contact with the adjustable stop 65 and halt the travel of the nut by the disengagement of the clutch pins l9, 50. Before this tripping is effected, the adjustable rod 66, Figure 9, of the carriage will contact with the roll carrying lever 31 and throw the roll out of vertical alignment with the bracket 30 so that the carriage may be returned against the adjustable stop screw 67 by the spring 68 located between the projection 69 of the stationary plate 8, and the projection 70 of the carriage foot 11, as shown more clearly in Figures 1 and 2. As grinding wheels vary in texture, it is iecessary that a soft or semispongy wheel remain in operation longer at the shoulder of the blade before the slide has started slowly back, than would be required of a wheel of harder texture. This idle travel of the nut is regulated in accordance with the texture of the grinding wheel by means of the adjusting rod 2]. of the slide. In other words, the distance between the inner end of the rod Ql and the lug 19 of the nut is increased or decreased to give a longer or shorter idle travel to the nut before its lug 19 contacts with said rod to effect the reverse movement of the sliding plate 20.

The face 55 of the former is shown as a straight surface, for the purpose of grinding the straight faces of cutlery blades, but it will be understood that any irregular shaped article can be ground on this machine by simply changing the contour of the former, to correspond to such irregular articles.

Having thus described our invention what we claim is 1. A. cutlery grinding machine comprising a grinding wheel, a pivotally supported carriage. a knife holder carrying sliding plate adapted to have a reciprocating movement on the carriage, a rotatable screw journaled in the carriage, a nut op 'atively mounted on the screw, means on the plate adapted to be engaged by the nut to reciprocate the plate, one of said means being adjustable to enable the nut to have a predetermined idle travel on the screw and means to effect a lat eral n'iovement of the'carriage toward the grinding wheel when the plate is at rest.

2. A. cutlery grinding machine comprising a grinding wheel, a pivotally supported carriage, a sliding plate adapted to have a re ciprocating movement on the carriage, means to effect a lateral movement of the carriage toward the grinding wheel, a rotatable screw ournaled 1n the carriage, a nut operatlvely mounted on the screw, means on the plate adapted to be engaged by the nut to reciprocate the plate, one of said means under spring tension topern'iit the nut to have an idle travel in one direction to insure the plate being brought against a positive stop, the other of said means being adjustable to permit the nut to have a predetermined idle travel in the opposite direction while the plate is at rest and during said lateral movement of the carriage.

A cutlery grinding machine comprising an abrasion wheel, a stationary support, a carriage pivotally mounted on the support and adapted to having a swinging movement to and from the abrasion wheel, a sliding plate mounted on the carriage, a knife holder on the plate, a screw journaled in the carriage, a traveling nut mounted on the screw, means on the plate adapted to be engaged by the nut to reciprocate the plate, a driving pulley mounted on the screw shaft, planet gear mechanism located within the pulley, said pulley and planet gear mechanism adapted to effect a rapid idle travel of the sliding plate in one direction, and a slow reverse travel in the opposite direction.

4. A cutlery grinding machine comprising a carriage, a plate mounted thereon, a knife holder on the plate, a rotatable screw journaled in the carriage, a nut having a reciprocating travel on the screw, means on the plate to be engaged by the nut to reciprocate the plate and also effect a predetermined idle travel of the nut in either direction when the plate is at rest.

5. A cutlery grinding machine comprising an abrasion wheel, a pivotally supported carriage, a sliding plate mounted on the carriage, a screw journaled in the carriage, means for rotating the screw, a nut mounted on the screw and having a reciprocating travel thereon, means on the plate to be engaged by the nut to reciprocate said plate and also effect an idle travel of the nut in either direction while the plate is halted, a former adjacent to the carriage having an incline face at one end thereof, means on the nut adapted to engage said incline and thus cause the carriage to be moved toward the abrasion wheel while the plate is halted, and means for returning the carriage at the conclusion of the grinding operation.

6. A cutlery grinding machine comprising an abrasion wheel, pivotally supported can riage, a reciprocating plate mounted thereon, a knife holder on the plate, a rotatable screw journaled in the carriage, a reciproeating nut mounted on the screw, nut engaging means on the plate whereby said plate is reciprocated and halted to allow the nut to have an idle travel in either direc tion, a stationary former having an incline returning the carriage after the grinding 0pfxce, a roll carried by the nut under spring eration. v tens-ion to engage saidinoline temove the car- In testimony whereof We affix our signa- 10 rialgeinto Contact with the abrasion Wheel tures.

5 While the plate is ha1ted,1neans fortempod rarily disengaging the roll'froln its operative 1?. engagement With the former, and means for CARL HENRY HEMMING.

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