US1432792A - Cutter head for woodworking machines - Google Patents

Description

F. SCHIMMEL.

CUTTER HEAD FOR WOODWORKING MACHINES.

APPLICATION FILED MAY SI, 1921.

Patented Oct. 24, 1922.

Patented Get. 2%, 1%22.

race.

FRIDOIQIN SCHIMMEL, 0F FARIBAULE, EUNE@TA.

CUTTER E 18.5. I FQE WOQDWORKING' MACHINES.

Application filed may 81,

To all whom it may concern:

Be it known that 1, Famous SOHIMMEL, a citizen of the United States, residing at Faribault, in the county of Rice and State of Minnesota, have invented certain new and useful Improvements in Cutter Heads for Woodworkin Machines, and I do hereby declare the folfiwing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it a pertains to make and use the same.

y present invention provides an improved cutter head for use in wood-workin machines such as planers and sha ers, an generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

One of the chief objects of this invention is to provide a cutter head, the cutting action of the several knives of which will be continuous or substantially so, thereby producing a very smooth surface free from waves or irre ularities. I Another object is to provide eEicient knives that may be made at small cost and readily applied inspiral arrangement on the cutter head and which, moreover, when applied, may be readily sharpened. These objects and others are accomplished in the cutter head illustrated in the drawings, wherein like characters indicate like parts throughout the several views.

Referrmgto the drawings:

Fig. 1 is a plan view of the cutter head, some parts being broken away; and

Fig. 2 is a section on the line 2-2 of The body of the cutter head 3 is of substantially cylindrical form with spiral channels therein and it may be formed integral with or driven onto a mandrel 4, but

.the former construction is illustrated in the drawings. The body of said cutter head 3 is formed with spiral clamp channels or grooves 5 that diverge in cross section, leaving intervening spiralribs 3 with approximately parallel sides, which parallel sides, of course, have a spiral trend.

As an important feature, the knives 6 are thin tempered steel blades that are normally or naturally flat but are capable of springing and thereby fittin themselves to the slightly spiral sides of t e ribs 3, when subjected to pressure'from wed e-shaped clamping blocks 7. These clamping blocks 7, are so beveled that when they engage the blades 1921. Serial lilo. 473,683

6 at one side at inner and outer points marked 7, they will engage the face of the opposite rib 3' only at one point 7?, which Is at the center of the outer edge of said block. The bearing edges '2' are preferably cut away so that they bear only near the ends of the block. This gives the block a fourpoint bearing against the blade at one side and a one-point bearing against the rib 3* at theopposite side. Otherwise stated, the clamplng block can adapt itself to the blade and its bearing 7 will then find its proper point of bearing on the opposite rib 3 Screws 8, passed through perforations in the blocks 7 and screwed mto radial seats in the head 3, serve to detachably clamp the blocks 7 in position as stated. As these blocks are faced at suitable intervals alon the blades they will securely hold the same, cause said blades to be clamped tightly against the spiral surfaces of the ribs 3 and to assume the spiral form of the latter.

As is evident, the knife blades in thin normally flat form; may be easily made at comparatively small cost, whereas, heavy kn ves would have to be ground or cut to splral form and would be relatively very expensive. Moreover, the thin blades are capable of being easily sharpened, either before or after they are applied to the cutter head. They should be ground and sharpened while applied to the cutter head, and for this purpose, I have devised a highly efficient grinding tool, which is made the subject matter of a companion application, filed of even date herewith under Serial Number 4:7 3,682.

A cutter head with knives spirally applied as described will have a continuous cutting action, in that one knife will come into action before the knife just ahead of it has gone out of action, and this goes a long way towards insuring a smooth and waveless or otherwise irregular finished surface. Moreover, the knives are given a sort of a drawing action.

The above features, moreover, produce a cutter head that will require less power to operate it than a cutter head wherein the knives come into action intermittently.

In their outer faces, the spiral flanges 3 are formed immediately adjacent to the cutting edges of the blades 6, with channels 9. These channels 9 are formed with shoulders that extend parallel to the cutting edges of said blades and, hence, also follow spiral courses. These channels are important, first because they give clearance for the discharge of the cut chips and, second because their shoulders afford guides for a grinding tool, which, as already stated, is made the subject matter of a companion application, heretofore identified.

The statement made herein and in the claims that the cutter head has lon itudinal clamp channels and intervening anges is used in a broad and liberal sense to mean that they extend in a general direction from one end toward the other of the cutter head and re ardles of whether or not they are paralle to the axis of the cutter head or whether or not they follow s iral courses on the c lindrical surface of t e cutter head. It wi 1 be noted that the clamping blocks 7 are longitudinally spaced, with respect to each other, and the ends of the cutter head 3 to afford spaces into which may be inserted a suitable tool to engage the lower edges of the knives 6 and raise the same.

The cutter head described is especially adapted and particularly designed for use 1n connection with planers and other woodworking machines. The thin cutter blades are especially adapted for action on wood surfaces, whereas, for metal working, much heavier and difl'erently designed cutting edges or blades would be required.

What I claim is:

1. A cutter head comprising an approximately cylindrical body with longitudinal clam channels and intervening flanges, cutter blades clamped a ainst sai flanges, and clamps a plied in said channels, adjustably connecte to said body and operative to clamp said cutter blades in working positions, said clamps having longitudinally spaced contacts engageable with the cutter blades and also having single contacts located between said longitudinally spaced contacts and engageable with the flanges.

2. A cutter head comprising an approximately cylindrical body withlongitudinal clamp channels and intervening cutter blades clamped against sa1d flanges, and clamps applied in said channels, adjustably connected to said body and operative to clamp said cutter blades 1n workin posi tions, said clamps having longitudinal y and radially spaced contacts engageable with the cutter blades and also having single contacts located between said longitudinally and radially spaced contacts and engageable with the flanges.

' 3. A cutter head comprising an approximately cylindrical body with longitudinal clam channels and intervenin flanges, cutter b ades clamped against sai flanges, and

flanges,

contacts engageable with the cutter blades and also having sin le contacts located between said longitu inally spaced contacts and engageable with the flanges.

4:. A cutter head comprising an approximately cylindrical body with longitudlnal clam channels and intervenin flanges, cutter b ades clamped against sai flanges, and a plurality of longitudinally spaced clamps applied to said channels, adjustably connected to said body and operative to clamp said cutter blades in working position, said clamps having longitudinally and radially spaced contacts engageable with the cutter blades and also having single contacts located between said longitudinally and radially spaced contacts and engageable with the flanges.

5. A cutter head comprising an approximately cylindrical body with longitudinal spiral clamp channels and intervening spiral flanges, cutter blades clamped against said flanges, and a plurality of longitudinally spaced clamps applied in said channels, adjustably connected to said body and operative to clamp the cutter blades in working position, said clamps having longitudinally spaced contacts engageable with the cutter blades and also having single contacts located between said longitudinally spaced contacts and enga eable with the flanges.

6. A cutter hea comprising an approximately cylindrical body with longitudinal spiral clamp channels and intervening spiral flanges, cutter blades clamped against said flanges, and a plurality of longitudinally spaced clamps applied to said channels, adjustably connected to said body and opera tive to clamp said cutter blades in working position, said clamps having longitudinally and radially s aced contacts engageable with the cutter lades and also havin single contacts located between said f0 tudinall and radiall spaced contacts and engagea le with the anges.

7. A cutter head comprising an approximately cylindrical body with longitudinal spiral clamp channels and intervening spiral flanges, cutter blades clamped against said flanges, and a plurality of longitudinally spaced clamps applied in said channels, ad justably connected to said body and operative to clamp the cutter blades in working position, said clamps having longitudinally spaced contacts engageable with the cutter blades and also having single contacts located between said longitudinally spaced contacts and engageable with the flanges,

said cutter blades being thin and normally flat and adapted to be sprung to the spiral form of the flanges agalnst which they are seated by a pressure applied thereto from the clamps.

8. A cutter head comprising an approximately cylindrical body with longitudinal ngiclam channels and intervening flanges, cutter b ades clamped against said flanges, and clamps applied in said channels, adjustably connected to said body and operative to clamp said cutter blades in working posi-.

tion, said clam s being longitudinally spaced to permit t e insertion of a tool into the channels for engagement with the cutter blades to lift the same.

9. A cutter head comprising an approximately cylindrical body with longitudinal clamp, channels and intervening flanges, cutter blades clamped against said flanges, and clamps applied in said channels, ad ustably connected to said body and operative to clamp said cutter blades in working position, said clamps having longitudinally spaced contacts engageable with the cutter blades and also having single contacts located between said longitudinally spaced contacts and engageable with the flanges, said clamps terminating short of the ends of said channels to permit the insertion of a tool into the channels for engagement with the cutter blades for raisin the'same.

In testimony whereof I ax my signature.

FRIDOLIN SCHIMMEL.

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