US2473541A - Roller pressure bar for veneer lathes - Google Patents

Description

June 21, 1949. 2,473,541

W. J. MILLER ROLLER PRESSURE BAR FOR VENEER LATHES Filed March 31, 1947 IN VEN TOR.

Patented June 21, 1949 ROLLER PRESSURE BAR FOR VENEER LATHES William J. Miller, Seat liott Bay Mill (30., Sea

of Washington tle, Wash, assignor to Elttle, Wash, a corporation Application March 31, 1947, Serial No. 738,456

2 Claims.

This invention relates to a roller pressure bar for a veneer lathe and the present invention is in the nature of an improvement on the double roller pressure bar disclosed in the prior patent application of myself and Alfred C. Johnson, Serial No. 623,706, filed October 26, 1945.

In the use of roller pressure bars of this type it is found that foreign matter in the nature of dirt, particles of wood and bark, pitch, sap and the like will get into the space around the rollers and interfere with the operation of these rollers.

An object of this invention is to improve the construction of roller pressure bars of this type by providing improved means for keeping the rollers clean and for discharging from the rollers small particles of foreign matter, such as dirt, bark, wood, pitch, sap and the like, that may get into said rollers.

A further object is to provide a double roller pressure bar having a log engaging pressure roller that bears against and has rolling contact with a driven backing roller, said two rollers having a cover member thereover that is provided with a plurality of spaced apart openings posi tioned above said two rollers so that foreign matter which gets into the space around said rollers will be discharged through said openings.

In the drawings Figure 1 is a fragmentary plan view of a double roller pressure bar constructed in accordance with this invention.

Fig. 2 is a view in cross section of the same taken substantially on broken line 2--2 of Fig. l and showing a fragment of a cap member in which the pressure bar is held.

Fig. 3 is a View in longitudinal section taken substantially on broken line 3-3 of Fig. 2, the cap member being omitted.

Like reference numerals designate like parts throughout the several views.

In Fig. 2 of the drawings 5 designates a fragment of the pressure cap of a veneer lathe. This cap 5 is provided, at its front edge and adjacent the position of a log 6 from which veneer is to be peeled, with an L-shaped notch 1 within which this pressure bar assembly is mounted.

This pressure bar assembly comprises a main supporting bar 8 adapted to rest in the L-shaped notch l and rigidly secured to the cap member 6 as by cap screws 9. The top side of the bar 8 is notched in stair step fashion, from its front edge rearwardly, to provide one shelf in on which a roller supporting plate ll, preferably of bronze, rests and another shelf l2 on which a strong heavy roller cap l3 rests. The cap I3 is rigidly secured to the bar 8 as by cap screws M. The

- ber I3 above the rollers 2| and 22.

bottom surface of the plate H preferably has a longitudinal groove l5 that fits over a lon itudinal rib It on the shelf ID to firmly anchor this plate I to the bar 8 and to prevent movement of said plate II. A similar interlocking groove l1 and rib l8 are provided between the main supporting bar 8 and roller cap [3.

A roller backing bar 19, preferably of bronze, rests on the roller supporting plate i l and is positioned against an upright wall 20 of the bar 8. The front side of the roller backing bar I9 is of concave shape to receive and support a drivenbacking roller 2!. A pressure roller 22 rests against the backing roller 2| and is held between the bottom plate II and rigid roller cap l3 and has its forward surface exposed for the purpose of engaging with a log. Preferably set screws 4 are threaded through the cap l3 and jam against the backing bar I9. These set screws 4 can be adjusted to vary the pressure of the cap member I3 on the rollers 2| and 22.

The upper surface of the roller supporting plate I l and the lower surface of the rigid roller cap i3 are provided respectively with longitudinally extending arcuate grooves 213 and 23 which receive the backing roller 2|.

The front edge portion of the cap l3 that covers the rollers 2| and 22 is rounded on top as shown in Fig. 2 and terminates in a relatively sharp downwardly curved lip 25 that rests on and engages with and helps to hold the pressure roller 22.

A plurality of escape openings 26 for foreign matter are provided at intervals in the cap mem- Preferably these openings 25 are formed by the use of a grinding wheel by grinding two oppositely disposed intersecting arcuate recesses on opposite sides of the cap member [3. This undercuts the cap l3 and leaves relatively wide openings directly above the rollers 2| and 22 for the escape of foreign matter. It has been found that openings of the shape and form shown operate efficiently in the discharge of foreign matter. Bearlng surfaces 2'! for the rollers 2| and 22 are provided between the openings 26. Pressure bars of this type are usually from eight to ten feet long and it has been found satisfactory to provide discharge openings 26 at spaced intervals of about three inches. The backing roller 2! is driven in the direction indicated by the arrow in Fig. 2 and the pressure roller 22 is oppositely driven by frictional engagement with the backing roller El and by contact with the rotating log 6 from which veneer is being removed as by roller having an exposed-peripheral portion adapted to engage a log from which veneer is to be removed; and a cover portion rigid with said bar extending over both of said rollers and having openings therein for the discharge of :foreign matter from the space around said rollers.

2. -Roller, pressure bar means for a veneer lathe comprising a roller carrying bar having a rolle receiving recess extending longitudinally thereof a driven backing roller carried by said bar; a pressure roller carried by said bar and havim peripheral contact with said backing roller am driven by said backing roller, the contacting por' tions of said two rollers. being continuously movable in an upward direction when in operation said pressure roller having an exposed peripheral portion adapted to engage with a log from which veneer is being removed; and a cover portion rigid with said bar and extending over both 01 said rollers, said cover portion having a plurality of spaced apart-openings positioned above the upwardly moving portions of said rollers for the discharge of foreign matter from the space around said rollers.

WILLIAM J. MILLER.

No references cited.

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