USRE96E - Improvement in machinery for grinding tools - Google Patents

Description

` the line of the radii, or nearly so.

UNITED STATES PATENT OFFICEC WILLIAM HOVEY, OF VORCESTER, MASSACHUSETTS.

IMPROVEMENT IN MACHINERY FOR GRINDING TOOLS.

Specification forming part oi' Letters Patent No. 4,204, dated September 23, 1845; Reissue No. 96, dated June li), 1847.

To alt whom, it may concern.-

Be it known that I, WILLIAM HovEY, of VVorcester, inthe State of Massachusetts, have invented a new and useful machine for grinding the twisted or spiral cutters or knives used in the machine for cutting straw, and generally known as Hoveys Straw-Gutter, 0r any cylinder-knives which require a sharp chisel-edge that cut on a roller; and I do hereby declare that the following is a full, clear, and exact description of the principle or character which distinguishes my invention from all others before known, and of the manner of making, constructing, and using the saine, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is a perspective representation of the machine, and Fig. 2 a transverse vertical section of the same.

The same letters indicate like parts in all the iigures.

In the accompanying drawings, A represents the frameof themachine properly adapted to the operative parts. B is the grindingwheel, made of stone or any other substance, mounted on a shaft, a, running in appropriate boxes b b, and provided with a pulley to receive motion from any first mover. The spiral or twisted blades or cutters c (such as are used in my straw-cutter) are attached by Screws to a iiange on the stock or shaft e, corresponding in form to the arms to which they are attached in my straw-cutter, their plane `radiating from the axis, or nearly so, and, as

before stated, they cut by pressure applied in This stock e is hung by center pins to the forward part of a carriage, f, which traverses longitudinally and parallel with the axis of the grinding-wheel B on ways g g on another carriage, h, which slides on ways t' i on the frame A, and at right angles t9 the motion of the upper carriage, f. The traversing motion of the upper carriage, f, is given by a screw, 1r, having its bearings in the under carriage, k, that passes through a hole in the end of the upper carriage, j', the lower piece, Z, being provided with threads to take in the threads of the screw, and one end jointed to the end piece of the carriage, and the other provided with a jointed catch-link, n, so as to connect the carriage with the screw to traverse the cutter or knife when presented to the action of the grinder, and to disconnect it for the purpose of runningback the carriage. Motion is given to the screw by a belt, o, from a small pulley on the shaft of the grinder to a large one` q, on the screw, to reduce the motion. The spiral blade is kept up to the grinder as it travcrses by mean's of a gage-screw, r, that passes through an arm, s, attached to the under carriage, h, and in front of the grinding-surface of the grinder, so as to insure the reduction of the edge of the spiral or twisted knife to a line which, when applied to the stock of the straw-cutter, will generate a cylinder. The motion of the under carriage, It, from and toward the grinder is effected by a screw, t, which has its bearing in aboX, u, in the frame, and takes in a nut, n, at the bottom of the carriage, and is provided with a crank-handle for the purpose of increasing or decreasing thc Obliquity of the back to be ground, and to adapt it to the wear ofthe grinder; and the gage r is tapped in the arm s, that it may be regulated to the position given tothe knife by this carriage.

The nature of my invention consists in the addition and combination of certain parts or elements of machinery to produce a new and useful result-viz., the grinding or reducing to a sharp or chisel edge the knives or cutters such as are used on my straw-cutters, or any other cylinder-cutters that operate and cut on a roller by a pressure of the edges of the knives against the surface of the roller as they revolve in connection, as also the method of transferring them from the stock of the grinding-machine to the stock of the straw-cutter, or from one straw-cutter to another, if necessary, by means of which method 0r arrangement the cylinder-knives for Straw-cutters or any cylinder-cutters which cut 'on a roller become an independent article of merchandise, and can be sent separately to any part of the country and fitted to the cylinders of strawcutters having flanges or wings corresponding in size and form with the flange or wing ot' the stock of the grinding-machine. I class these parts or elements as follows: first, the main frame and grinder; second, the traversing carriages; third, the mechanical arrangements to give motion to the machine; fourth, the extra stock with flange; fifth, the adj ustable arm and gage-screw.

I do not claim the invention or combination of the first, second, or third parts or elements ot' machinery as eonihined in this machine, standing alone, as that hns heen used hel'ore for other purposes; but` the t'ourth and tit'tlh parts 0r elements ol' this eoinhinatiiln I do con- Sider suliieieutly new in their application in combination willi the Iirst, second, and third parts or elements as to produee the desired result and t0 constitute au entire new combination of the whole tive parts or elements oi' machinery.

I will here deserihe the stock fy as used and applied hy ine in this elunlllnatlon. and also the arni s willi thtI g;io stfiew r, which l fousider as new und important parts ot` the cour hination. 'lhe stoek f'. l nutke and apply as follows: l take one ot' the stoeks ol` the straweutter with all the wings or llane'es raston the Sante. 1 then ent otl'nll the wings or t'langes but one. ',lhisl leaveon t he stotlgwhieh tlunge,

oi' course, will he n duplicate ol' nl l the tlunges on the cylinder or stoel; otl the straw-cutter, and the hodyot' the stoek will he the saine. Vl apply this separate stot-k to niy whirling-niuehine usa part ofthe nniehinetortlupurpose of holding' the knives in :1` proper position to he ground to n sharp ehisel or bevel edge. l then attach by .screws or othorsuitalilc lusten ingone knite to the tare ol this lionne, projeeting i'roin said stock. and hy nir-ans olA a grinderand other parts eonillined tti isground to a sharp el1isel-edge,it' re|p|ired. sueh as are used i'or eutting straw` 5.o. hy rotting on a roller. \\'l|eu one kniI'e is thus ground. it is detached troni the linneo on the stock ol` the grinder, and transtlrred to one ot` the flanges otl the steek otl the straw-entier, and it there assumes the saine position that it did on the stock ol' thegrinder while hiring ground. Vly repeating that operation :di inyY knives are ground and transferred to the eyliiuler-stoeks ol' the straw'eutters. "llu iniportaumi olI this extra stock will lio olsvious when it is understood that :t single kuil'e rnnnot he ground in this machine it' attached to the stock ol` the strawfeutter, as tho llanges or wines would in terl'ere with theel-luder and prevent the hat'k ol` the knife t'roin continu' in ront-net with it so :is to give the propri' hevel to the cuttingedge. 'There is another great advantage derived troni this extra stoe'lt on which the knives are ground. lu consequence ol'the t'aee ol' the linneo whieh holds the knil'e heinga. duplicate ot' the t'ares ot' all the lluuges onthe stocks of the straw'rulter, they can he transferred t'roni the grinder ol' the stt':t\\cutter and from one straw-cutter to another, whirh inakes thein an article ol' merchandise independent ot' the other parts otthe straw-eut` ter. This stock c in all euses for grinding,` spiral knives inust roi-respond in size and t'orni with the stock ot the` stuur-cutters, and the face ofthe tiange n1 ust he an exaet (triplicate ofthe faces of all the flanges oty the straw-cutter. This extra steek," as l have teruied it, thus becomes a part ot' the griudinginaehine as much as the grindstone itsell'.

The gage-Serew fr and the arm .s are also eensiderd important parts ot' the combination. which ,l describe as follows: The arm sis made in the forni ol'l a gooseneck and attached to the outside ot' the bottom carriage, as shown in the drawings. It is s0 attached that it een he raised or lowered tio accommodate the size or diameter ot' any eylinderknile required to he ground. lhehack of the knives is pressed up hard agminsty the face ot` the grinder by means ot' this screw, in connection with the arm x and the gage screw r, both being` adjustahle. The point ol' the screw can he so applied as to press against the laee ot' the knife near its edge as it traverses longitudinally loet'ore the grinder, and will serve not only to e'ive thetwist tothe ground bevel of the knife corresponding` with the twisty ot' the faces, hut will hold it lirnt against the grinder as the edge traverses between the l'aee of the grinder and the point ot' the gage-screw r while in the operation ot' lgrinding. Vlt is important that this arin s should he nnule as strong and intiexihle as possible while the operation ot' grinding is performed. in order to prevent the knile iront yielding or giving hack t'roul the thee ol' the grinder while being ground, and preventing at the saine tiine the point Oi' the gaee'serew r troni moving or Iyielding laterally as the knit'e traverses lengthwise between the point ot' the sere Yand the face of the grinder. This arni nray he so shaped as to answer a similar purpose without using the gage-screw r. lt muy he pointed at the end where the screw is inserted` so as to press against the [nee ol' the kuit'o and hold itin contact with the grinder; or it inay loe made a permanent lixture and the grinder arranged so as to adjust its hearing on the back ot' the knil'e; hut in any event the gage that hears the knife against the erinder while heine ground must lnl inllexilrle, or as nearly so :is possible, to insure a cyliiulrical edge to a k nite when ground to a tial` llevel. it also important that the point ot' the gagesercw r or the point ot' the gage should he placed against;

the knife near the edge, and the grinder so titted that a narrow l'aee should he presented to eonlo i n Contact with the hack of' the knife. The point ol' the gage should he directly in l'ront ol' the narrow face ol' the grinder to iu- .sure a true and straight cylindrical edge to the knil'e. it is important that the bottoni rari-inge .should he kept tirin iu its proper position while the machine is inthe operation ot' grinding, and that the upper traversing carriage should be sutiieiently weighted to keep it troni yielding t`roin the grinder.

VWhat Vl. claim as my invention, and desire to secure lay Letters Patent, is-

lhe application ot' the stock v and the arn1 s, in combination with the other parts or eleineuts ot" machinery, substantially in the inanner described, and for the purposes above set` forth.

1Witnesses: XVILLIAM HVEY.

J. J. (tnniaNoUou, J. S. Snrru'.

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