US1413206A - Paper-cutting machine - Google Patents

Description

R. S. TYLER. PAPR CUTTING MACHINE. APPLlcATloN FILED Ams. 1919.

Patented Api'. 18, 1922.

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RALPH si TYLER, Or'eLfEvELANn-Hnierims, Cirio, AssIeNOR 'ro r1-IE CHANDLER ANI) Y PRICE COMPANYy OE CLEVELAND, OHIO, A CORPORATION or OHIO.

PAPER-CUTTING MACHINE.'

laisses.

Specification of Letters Iate'nt. Patented Apr; 1.8, 1922.

Application filed April 8, `1919. vSerial No. 288,556.

[o ZZ fr0/wrm t may concern.'

' Be it known that I, RALPH S, TYLER a citizen of the United States, and a resident of `Cleveland Heights Village, county of Cuyahoga, and 'State of Ohio, have invented a new and useful Improvement vin Paper- Cutting Machines, of which the following is a specification, the principle of. the invention being herein explained and the `best mode i-n which I have contemplated applying that principle, seas to distinguish 1t from Other inventions.. y

In machines of the class in hand, it has been found desirable, for `obvious reasons. to impart a transverse as well asa vertically reciprocable movement to `the knife which trims the stock, so as to impart a so--called shear stroke to such knife. This is Ordinarily accomplished by providing an inclined guideway in the frame in which the Vknife isthus vertically reciprocable, and "attach-ing tothe knife `or 'its carrier fa slide movable in said guideway, -so that as the knife is depressed, as in the cutting operation, itis simultaneously shifted longitudinally. In a machine thus constructed, however.V whe-re the vertical reciprocation of the knife or knife carrier is secured by connecting its respective ends with cranks Ona suitable crank shaft, the pull is 'all in a' downward direction, with the result that the slide block alternately tends to bear on the under side of the guideway and then on the upper side, as the knife cuts through the stock, particularly if the latter, as is usually the case, does not offer a uniform resistance.

The consequent chattering of the knife has proven :i serious operative difficulty in these machines which it is the object of the present invention to overcome by providing for the application of the power from the crank shaft to the knife in a direction more nearly parallel with the aforesaid guideway, thus eliminating the tendency to chatter. To the accomplishment of the foregoing and related objects, the invention, then, consists of the means hereinafter fully described and particularly pointed out 'in the claims, the annexed drawing and the following descriptionl setting forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle Of the invention may be used. Y

In said annexed drawing, the single figure there appearing is a front elevation, partly diagrammatic in character, of a power paper cutting machine embodying my present improvement.

The frame of the machine includes the usual table or bed 1 on which the stock, consisting of a pile of sheets of paper, is placed in order to trim the same. Vertically reciproca-bly held in suitable standards 2 that rise above said bed is the knife head or stock'f carrying the knife e. This stock also carries a resiliently supported presser bar or binder 5 which initially ,contacts with such stock on the downward stroke of the machine in order to hold the sheets in place pending contact of the knife therewith. Adjacent one of the standards 2 is provided a downwardly and outwardly inclined guideway 6y which slidably receives a block 7 .pivotally attached by means of a piii '8 to the knife head Or stock 3., as will be readily under.

stood, .since this is ya familiar construction.

Journaled Ain the frame below vthe bed 1 is a power driven 'crank shaft 9, the cranks 10 on the respective ends thereof being operatively connected with the respective ends of the head 3. At the right-hand end inthe Figure as shown the connections comprise a suitable rod 11, the ends of which are attached to the crank and head by universal oints .12 and 13 respectively, and in the prevailing .construction the connection at the left-handV end would be the same. In my present improved construction, however, instead ofdirectly connecting the rod 14 at the other end of the machine, i. e. that adjacent the inclined guideway 6, with the corresponding end of the knife head 3, I employ a toggle arrangement as illustrated, consisting of two links 16 and 17 pivotally connected together, said first named link being a universal joint 20 likewise serves to attach the other end of said rod to crank 10.

The mode of operation of my improved machine may now be briefly setv forth. With the knife carrier 3 in its upper posi- `iinately parallel with slideivayi 6.

tion, illustrated. in the drawing, the toggle links'l and 17 lie with their point of interconnection a trifle below a line connecting their points oi" pivotal .attachment to bracket 18 and said carrier, respectively.

rizficcordingly, when the shaft 9 is rotated to pull downwardly on the connecting rods l1 and 1li, simultaneously with the downward Y pull exerted through said first named rod on the carrier 3, the other rod, pulling on the Acarrier through. link 17, has the path of movement of its upper end constrained by link 16 so .as to pull in a direction'approxyThere ivill'be a slightly greater component oi.: the pulling- `torce exerted'in the upward rather vthan the downwarddirect-icm having regard v to the angle of inclinationo-f such guide- Way7 so that the slide 7 will be held against the upper face of the guideway, irrespective oi the resistance encountered by the kin-.te

in passing through. the stock.v InV otherl Words, there will be no tendency for such knife to chatter, due tothe fact-that the .slide kbears at one moment against the lower 'face of the guide way, and at the next vagainst the upper face. A smooth and uni- :Fornl 'eut-ting stroke is thus secured, insurf ingptlieeven .trimming oi they .s/tcck,l and y avoiding 'the displacement `of its component sheets i Other modes olf applying the vprinciple ci my invention VInay'be employed instead of ,the one explained7 change being .made as. re-

gards the mechanism herein disclosed, provided the means stated by any .oie the fol- 'plowingV claims or the equivalent of ysuch vstated means be employed.

.I thereforeparticularly point out anddistinctly claim as my invention 1; ln la machine of the class described, the

- combination of `iframe including la bed, a

knife carrier reciprocable relatively thereto-g an inclined guideway; a sliding element enhorizontal plane intersecting said guideiva'y.

at approximately its central point,v said link being' of a length to maintain a light'contiict ol. vsaid sliding' element yagainst the upper tace of the guideway during the 'full cuttingr `stroke of the.` knife to prevent chattering 2. In a machine of the class described, the combination of a vtrame including` a bedgknife carrier reciprocable*relatively tl'i'ereto;

an inclined guideivay a sliding` element en-A said gnideway for imparting a trains Versefmove'ment to said carrier when i'eciprocated and means"forreciprocating sai/tl carrier including' a crank shafn connecting rods between said shaft and the respective ends of said! carrier, one of said rodsfbeing directly attached to the'latter, the otherfoi' said 'rods' being connected Vwith said carrier througlij a 'pair ofi toggle-links,' respectively attached at 'their'outer ends'to said carrier and to the machine frame adj acent'said guide Way but beyond the end ofsaid carrier, said outer toggle-link being; of less length' thanits companion link and the point of interconnection of therod with the central pivot of. the toggle being at all times below a straight line Vdrawn throughv the outer pivots Vot said` tonfnle, so that during4 the cutting;d stroke et theV mechanism a light contact of the slidingYV element with the upper face of thel guideway will be uniformly maintained. Y

Signedby me,rthis 7th day otApril, 1919. RALPH S. TYLER. i

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