US1928029A - Veneer patch cutter - Google Patents

Description

Sept. 26, 1933. .1. PETERSON 1,928,029

VENEER PATCH CUTTER i f i/ W5 .ATTORNE S Sept. 26, 1933. J. PETERSON VENEER PATCH CUTTER Filed Nov. 4, 1931 3 Sheets-Sheet 2 IN VEN TOR Petcman 2&7

ATTORNEYS Patented Sept. 26,

-YENEIERPATCII-I CUTTER" My present invention relates to the art of'veneer workingequipment and more particularly to a veneer patch cutter.

' In the production of multi-thickness veneer sheet it isnecessary tocut out certain ,iniperfections; such as small knots, holes and more particularly pitch pockets. Having cutout'the' defective portions of a venee'r'sheet, it is then nec-' essary to inserta patch in place :of the portion removed. This is normally formed'like a small boat, other words, of considerable length, narrow, and having rather sharply tapered sides. The production of this patch, however, has been quite an expensive operation in the past and it -is to provide means for economically making these patches that I have provided my present machine, therefore.

The principal object of my Vide a veneer patch cutter which is characterized by semi-automatic operations; so'that a' large number of patches can be cut in the minimum time, thus assuring the cheapest possible production of the same. I

j Other and more specific" objectswill be ap-- parent from the following description taken in connection. with. the accompanying drawings,

wherein I Figure 'l' is a U showing a strip of material from-which a number of strips or patches'have alreadybeen cut.

Figure 2 is a perspectve view showing one 'of the patches.

' Figure 3-is a sectional view in elevation along the:lines 3--3 of Figure 1.

Figure 4 isa similar sectional view the linesiof 44 of Figure. l.

Figures '5 and 6 are views taken'along thelines 55 of Figure 1 and illustrate two separate phases in the operation of my machine.

Referring to the" drawings, throughout which like reference characters indicate like parts, number 8 designates the main" table of my machine. This may be supported in any convenient V manner as by legs or maybe formed as apart ofa bench for instance; disposed upon table 8 are two electric motors 10 and 12. These are pivotably supported upon a transverseaxis from.

the supporting brackets14 and 16 respectively at and .17 respectively. Fixedly'securedto the main shaft of the motor, are oneor more saws as 18 and 19,.and 20 and 21 respectively. These saws should preferably be of saucer-like shape.

or the so-called curved-out saws. The general disposition of the saws and their driving motors inventon is to protop plan view of my-fma'chine I wardly over the sheave of pulley -36, and then taken along y the counterweight provide a smoothnessjo'f, oper It is neces'saryinthe operationof my. sawsto have them alternately cut and then be raised" above thesurface of the'material-they'are cut- .25 in the table top and pivotably'secured to the i bracket 22 by the pivot arrangementshownat 26. At the lower end of bar 23, I'have provided aroller 28 which in turn is adapted to operatively engage'the cam 30. Cam 30 is-fixedly secured to the driven shaft 32, which in turn may be; drivenbyany suitable source of power'as for in stance, the chaindrive 34. p

It has beenfound desirable to position pivots 15 and 17 at such a distance from the sauce'rflike saws, that the saws will swing on a true radius.

This condition, howeven'in view of the large size motors necessary; places the pivot axis-quite a bit in front of the. center of mass on-the motors,

'and with the cam arrangement I have shown,-

downwardly until it is. secured to they counterweight 33. The counterweightfshould be 'o fs uchasize that it will not, apph SO, much 'up'ward forces on the motor as to prevent it dropping] downward under the influence of-gravity, and

withdrawing the sawsfrom the strip; p 'It' will beapparent I believe-that'springsjmay be substitutedfor the counterweight" system; a however, the inertia which mustbe overcome in ation whichI'have not been able to obtain with any spring arrangement; t is desirable to have ajduplicate counterweight for each motor. f

is'used to tilt the other moto'r,'and nojrm'ally both motors operating equipmentjis timedto' operate ,together 'as I have found it is'.the most satisfactory, there being less danger ofthefdriftmov ing'out' of place. Now to properly understand the operation ofv my machine, it mustibe' remembered thatstrip lo is thin veneer woodusually some-Q vwhat thicker than the sheetfof veneer itisfintended to patch. This-makes it possible tohave the patch extend outa little bit beyond' the 'surstood that an exact duplicate of this arrangement, J

face of a finished sheet,so that it may be dressed 42'and 44 respectively. When the final touch 42 and 44 have been completed the chip down to the surface of the big sheet; as the sheet goes through its final, sanding operation. It' should further be understood that saws 18 and 19 formthe touchel and-43 respectively, and that a littlelater saws20 and 21 form the touch .45 is then compl'eteas shown inFigure'Z.

-Now,=.itjis necessary to accurately .p' sition-and move, to successive positionsthe strips 40. This s I' accomplish by-the guide members i and and the pressing fingers 52, allof which are 'se'.

cured to the base;53. 'The pressing members 52 are provided to constantly force strips 49 over against the side guide 48; It has been found neci .essary to provide some means for. preventing .patchesj iS being lodged'withinthe multiple saws as 18 and 19 after the finalitouch has been made. To overcome these conditions I provide the guide member .50-which presses down ontopof strip 40 e and holds the patches e5frorn coming out of their positions; It'will beapparent, I believe, .that it;

is-nece'ssary to provide curved slots inbar 50,;so

; that the saws may Work tlirough the-bar "and engage strip elitethe'full depth reduired. 1 Now itrrnust be 1 remembered that thesesaws operateiat vcryihigh speed. Consequently it is very essential that strip 40 be heldsecurely during the sawing operation, and then bereleased so that it can be moved to the next successive Qposition required. The downwardly or holding pressure isprovidedqby two shoes 55 and 56,- which are; preferably made adjustable.

These shoes are fixedly secured to thefldow wardlyi'exe tending push rods 57, which inftnrn are secured to; the ,corn non operatingbar 58; j

6811' provide the guide 7 Bar 53v is prof-Y vided withja cam engagingsurface 59;;which is preferably removable so thatii 'nrough wearitbecomes wornitcan .be'easily replaced. The sur faceii is positioned to engage the. pressure Cath 60. Due to slight variations in thicknessof stripsioI prefer to provide the actual downward pres-r sure bymeans of a plurality of springsfdispos'ed for compression as 82. As. itis ne'cessaryto move strip 40. to successive positions I providethe strip engaging pawl-6 L which fizedlysecnred to, the

operating leverfiS. Lever eaiispivotably sup ported at G'Zjandhas secured to its' lower-end the operating bar 68.. BarfiSis -.positionedjtojen-.

a ec'arn which in turn is mounted upon and driven bythe shaft 32. To properly position bar W2 and I rhavefifurther arranged to provide thefletracting means by having the'tension spring Wiseou'red to guide 72 and also. tolever 66;- so disposed as to at all" times keep the cam engaging end of depressed 1 In -foperatinge iny-device botlr motors; are started, andi allowed o attain their operating.

againstthe carnjii... C cthodflofopefrttzoh speed. iistripat ii) introduced into the guide waythat is under paw -3 5 up against guide 48;

.;und erf59 and arrangedfor thepressers 523'to ell-'1 .gag'e the sides. p under bar S'J, the pawl 64 will thenplaoeltherstrip in proper position. 'Ihe sequence of. operation is exactly as iollows; Cam 50. operates "to raise shoes 55-. and 56' upwardlyso that no pressure is.

soon "as the bar is entered:

' provided on barfeo. The'next'operaticn;is;ior

sition indicated in Figure 6;

used by thismethod;

. of -,Werk;

V for automatically and saws.

3. -In veneer patch cutter, the j combination" cam' .70 and ;the' associated mechanism to move pawl64 toward the saws; This carriesstripeo .the distance between successive patch cuts.

When the operation of fpawl 64 has been com pleted, cam 60 revolves sufiiciently to allow the gravity restore the motors withtheir saws listed as indicated in Figure' fi This completes one cycle of operationand'after the. strip has passed through, soas to be engageable by bothsets ofsaws, two patches areproducedfon each rocking of the saWsandes'the entire mechanism'is driven at considerable speed; an unbelievable number of patches can be produced in a very short time. -j I I have indicated my machine with one 'or'two saws on a single shaft. It is possiblef howeverj to use inore, thantwogsaws if. conditions demand increased production. The angularity, however; of the *saws-..isisuch; that possibly three orfour saws would be the maximum1-which could be I There aremany features of construction which I I have notillustrated ..completely "as they will be.readilyapparentxto one skilled inthislclass Theforegoing description and the accompany-. a

ing drawings-fare believed to clearly disclose a be understood that thisdisclosure is merely. il1us-..

' trative, andthat such changes. .in the invention as .vmay be made are fairly within the scopeand "spirit of the following'claimszl 1 f Having thus .Ifully described my invention; what. I; claim as new and desireto secure by Letters 1. In a veneer mounted; thereon. of: means for 1 simultaneously retractingtheftiltable motor's andfsaws':

,2. In a veneer patch' cutter; :the combination preferred embodiment of my invention butfitywilt no v patch cutter,the1combination; witha pair of laterally offset,ltiltable motors, and oppositely arranged bow-shaped rotary saws.

tilting the motors at substantially the center'of' the sphericalcontour of the saws to operative-pe sition of the saws; and means" forautomatically with a. pair of laterally offset, tiltable motors, and j I oppositely arranged rbow-shaped rotaryr saws mountedthere'on' of a cam-shaft and cams there-' on, cam armsmounted onuthe motors andicam devices on said ar ns for co-;action'withithc..cams for tilting-the motors at substantially the centerv ofthe spherical contour offthe saws, and-means" retracting 1 tiltable motors arms pivotallyconnected. :with: said mo'to1's.;and-

; cam deviceson said arms for co action-Jwith the ,camsiortiiting .the motors at substantially the I center .oithe spherical-contour of the saws,- and a counterweight suspended from. each motor-for retracting said {motors and saws.

and oppositelyyarranged bow-shapedrotary saws V thereon, of a cam-shaft and cams thereonycami f J LI PETERSON.

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