US1653916A - Jointer - Google Patents

Description

Dec. 27, 1927. 1,653,916

F. s. LAsH- JOINTER Filed Nov, 23, 1925 Patented Dec. 27, 1927.

- g Lanai-e UNITED STATES I?1ii"fl`E-N"I` OFFICE.`

FRANK S. LASHQOF SAGINAW, MICHIGAN', ASSIGNR JACKSON & CHURCH C0., `0F

SAGINAW, MICHIGAN, CR-PEATION F MICHIGAN.

JOINTER.

Application filed November 23, 1925. Serial No. 70,850.

This invention relates to jointers and consists of an improvement on an old machine whereby certain disadvantages in operation are overcome, such `as jerky motion of the feed mechanism and gouging the iingers into the work, and certain new and `better results are obtained, such as smoothness of operation and longer working life of the feeding fingers.

0 The type of old machine to which `my improvement is 'applicable is that of the jointer shown in Herzog Patent No. 919,351. In this machine there is an automatic mechanism for feeding the work `to the revolving cutters, whereby danger incident to hand feeding is avoided. In that machine there is also provided mechanism which feeds the work with a slight pressure thereon so as not to bind or spring the board from its `natural shape, in order to produce a perfectly straight plain surface.

As is well known in the art7 the feed mechanism ofy the Herzog machine is mounted upon a frame and is adjustable therewith `toward and from the bed ofthe jointer to accommodate different thicknesses of work. This feed mechanism 4consists of an endless chain that engages sprockets on cross shafts at opposite ends of the frame.

The carrier is formed with parallel chain members engaging the sprockets and a series of cross bars connecting` the chain and spanning the bed of the machine from side to side, to these cross bars the work feeding devices are secured. These feeding devices consist of lingers or sharpened pins slidably mounted in the cross bar and yieldingly pressed downward by springs. The tension of these springs is only sufiicient 'to engage the points of the fingers with the upper surface of the board without springing the board from its natural shape, and the large number of fingers that are simultaneously engaged with the board exert sufficientdriving force to feed the work across the bed of the jointer. j

A machine of the kind to which my improvement is adapted to be applied may, as in the foregoing patent, be described as a jointer having an endless work carrier comprising a pair of parallel sprocket-supported chains, one at each side of the machine bed, a series of cross bars connecting said chains, and a plurality of fingers arranged longitudinally on each cross bar, and projecting` intofengagement with the work, each of said fingers comprising a vertical member proangles to the face of the work before the fingers are brought into contact with `the work.` y i In the accompanying `drawings I have illustrated `those features of the invention.

covered by the claims. Fig. l is ka side view broken away in part, showing an end of the work carrier with my improvement applied thereto. j

Fig. 2 is a side View, showing the connection `of my improvement with` a jointer of the old Herzog type.

As will be readily understood by those fzmiliar with the machine, or upon reference to the patent above referred to, the work carrier' includes frame l having mounted thereon at each side of the bed an endless chain 2 carried by driving sprockets 3 and driven sprockets 4, the direction lof travel of the chain being as shown by the arrow in Fig. 2.' The lower or working run of the chain runs upon a horizontal track 5 and is held down by an upper trackmember or guide rail 6.

As the chain is drawn forward by the action of driving sprockets 3, it is obvious that the slack pait of the chain runs ofi' from sprockets i and comes around upon the horizontal track 5 bringing the sharpened ends of fingers 7 into engagement with the work S at a point below and slightly in advance of the idle sprockets 4:.

It has frequently occurred that when there is sufficient slack in chain 2 after running ofi' the sprocket i itv would sag down beneath sprocket l so as to` let the fingers 7 come into contact with the surface of the board while the fingers had a pronounced rearwardly raked position, as indicated in' Fie'. l.

'Ilic result of lettering the finger points contact with the board with the fingers in an oblique position was to make the working points of the fingers to gouge into the board as soon as the chain was forced into its nor- In order to position thesuceessive chain members 2 so that their fingers `'l' will be approximately"perpendiculareto the `face of the board 8 before the` lingers can Contact with the board, even though the chain be slack as it runs ott sprocket 4. I provide on the track member @beneath the sprocket 4C and in advance of the track member 6, as shown in Fig. l, a guide block Shaving'a tiatiorwardly and downwardly inclined upper surface l0. rlhe blocks are wedge shaped pieces ot metal havingilat upper surfaces to forni runways `for ,supporting the links of the chains between the time of their leavingI the chain sprockets Il and their contacting with the horizontal track z. Each block is secured by countersunk bolts or otherwise to the horizontal track 5.` The slack of the chain allows each of its fingercarrying,` links to seat flat upon this `inclined surfacel() before the sharpened ends of iin` gers 'i' can come in contact with the work 8. This seating ot the iingencarrying links flatupon incline l() before the fingers can come into operation results in presenting the fingers to the work `while they are nearly at right angles to the plane of the work instead of at a draggingangle of inclination. The chain link rests upon the inclined face l0 of block 9, and as thechain travels for ward the link slides down the incline and its `the lirst time overcome diiiieulties in the operation `of these machines that haye long:r been known to exist, but for which no ade quate remedy has heretofore been devised.

Having thus described my invention, what I claim and desire to `ensure by Letters Patent is:

' In a jointer of the class descrillled ineluding a traveling carriercomprising chain supported flights having spring-pressed work-engaging' lingers, sprockets supporting said chain, a guide track beneath thelower run ot `said chain and `a guide member secured to said track beneath a sprocket, the upper tace of said guide member torfardly and downwardly inclined to provide a support for the slack part ott said chain" beneath the sprocket, whereby the lingers ot' successive flights are positioned substantially at right angles to the face ol the work belore said fingers `are brought into contact with the work, for thepurposes set foi-tir In testimony whereof, l ailix my simiature. FRANK LA Fill.

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