US1430668A - Adjustable mounting for stationary knives of cutting machines - Google Patents

Description

P. S. MITTS AND W. J. WINSTON.

ADJUSTABLE MOUNTING FOR STATIONARY KNIVES 0F CUTTING MACHINES.

APPLICATION FILED JAN-9,1922.

Patented Oct. 3, 1922.

III!

IH Ill /MNVENTOR$ ATTORNE Y Patented Oct. 3, 1922..

v reo stares PHILIP S. MITIS AND WILLIAM J.

wrnsron, or saenvew,

MICHIGAN, ASSIGNORS T0 MITTS & MERRILL,-

SAGINAW, IVIIGHIGAN, A CORPORATION OF MICHIGAN.

ADJUSTABLE MOUNTING FOB STATIONARY KNIVES 013 Application filed January 9, 1922.

justable mounting for the stationary knives of cutting and shredding machines, and pertains more particularly to a knife adjustment for cutting machines of the kind which comprises a casing having a cylindrical drum revolvable within the casing and cutters or knives arranged around the periphery of the drum and carried thereby. Such cutting machines also usually have stationary or anvil knives mounted in the ,casingand arranged in parallel relation to the drum rim and spaced apart around the lower periphery of the drum.

Cutting machines of this type usually have the casing provided with an inlet hopper at one side of the drum axis and an outlet spout at the other side.

In operation, material to be shredded or cut into granular form is fed into the inlet hopper, and under the combined action of the rapidly revolving drum and of the successive stationary knives, the material is cut and recut while passing from the inlet hopper to the outlet spout, whence it is d1scharged as granulated or shredded material.

In cutting machines of the character above described it is essential for accurate and uniform cutting that the stationary knives be maintained in proper adjusted relatlon to the cutting edges of the knives on the revolvingdrum; that is to say, there must be no yield or movement of the stationary knives, and their working edgesmust be so gauged with relation to the knives on the drum that the stationary knives can be restored to their proper cutting position after having been taken out for sharpeningor dressing without danger of disturblng the proper alignment of the cutting edges of the stationary knives with respect to the cuttlng edges of the revolving knives. Furtherprovide means, easily accessible CUTTING MACHINES.

Serial No. 527,948.

more, it is essential that and clamping means shall the stationary knives, to prevent movement or chattering, and it is also desirable that the arrangement of the stationary knives with respect to the casing shall be such that the knives can be easily and quickly removed from the casing, dressed or repaired and'replaced in the casing with a minimum of labor and without resort to accurate gauging or measuring methods.

proper adjusting be provided for In cutting machines of the kind. to which our-present improvement is particularlyintended to be applied, the knives have-usually been mounted in the casing, and the casing, or that part of it in which the stationary knives are mounted, has been made removable so as to gain access to the knives for replacement and repair.

ur present improvement has for its object to provide means whereby the knife will be accurately gauged and held with its cutting edge 1n proper relation to the cutting edges of the revolving drum knives, also to from out side the casing and at the ends thereof, whereby to clamp the stationary knives in their said adjusted positions.

A still further object is to provide a mounting for the stationary knives, comprising endwise clamping devices that rigidly 'hold the knife against longitudinal movement and yet permit the knife to be easily and quickly removed from the machine, not by a removal of part of the casin as heretofore, but by withdrawing the kni e from the end of the casing, the knife being drawn out longitudinally.

With the foregoing and certain other objects in view, which will appear later in the specificationJour improvement consists in the devices described and claimed and the equivalents thereof.

In the drawings, Fig. tive view of a cutting our improvement.

Fig. 2 is an enlarged sectional detail on the line 22 of Fig. 1, showing the arrangement of clamping and adjusting devices as applied to one end of the stationary knife.

Fig. 3 is a part sectional diagrammatic detail of a knife, showing the sidewise clamping device and the tapered slot in the casing.

In the drawings, 1 indicates the usual cas- 1 is a front perspecmachme embodying Cir ' adjusting wall 19 of casing ing with the inlet hopper 2 at one side and the outlet spout 3 at the opposite side. Re volvably mounted in the casing 1 is a cylindrical drum 4: carrying on its periphery the usual cutting knives 5.

6, 6 designate the stationary kniveswhich extend parallel to the axis of the drum 4: and are spaced around the lower part of the periphery of the drum and casing and between the inlet hopper and the outlet spout 3, as shown in Fig. 1. J i

To provide quick and accurate adjusting means whereby the-stationary cutting edges of the cutting knives 6 may be adjusted in proper relationto. the drum knives 5, we

provide on the casing 1 a pair of lugs T, 7, between which is a knife-receiving slot 8, in which the stationary knife 6 is received by being inserted endwise from the side of the machine as previously described. Each of the lugs 7, 7V is tapped to receive an adjusting stop or bolt 10 with a set nut 11 or equivalent locking means, the heads of the adjustable stops 10 adapted to take against the front and rear edges of the knives 6, 6 respectively. The front or cutting edge is gauged by setting the inner adjusting bolts, and the knives are clamped against outward displacement by the outer set of adjusting bolts. 6 J

A bar 12 spans the space between the lugs 7, 7, its ends being removably fastened by bolts 13, or otherwise, to the lugs.

In the middle of the length of bar 12 is an bolt 14: having a set nut 15, the inner end of this adjusting bolt adapted to engage the end of the knife 6, there being one such bolt at each side of the machine. The knife is readily clamped against endwise movement, and the bolts 14 are locked, by means of the set nuts 15.

Thus, by means of the bolts 10 and 1 1, the stationary knives can be easily and quickly clamped in their exact adjusted positions with respect to the knives of the drum.

Referring now to Fig. 3, itwill be seen that the slot 8 1n the side wall of the casing 1 is made considerably wider than the thickness of the knife at that part farthest from the axisof the drum, and that a set bolt 16, threaded through a lug 17 on the casin is provided to clamp the stationary knife 6 sidewise against the wall 18 ofcasin r 1. The working edge of the knife is backed by the 1, to resist the cutting stress, which is applied against the knife in the direction of the arrow. Thus, when the bolt 16 is loosened,the knife is immediately released from walls 18 and 19 ready to drop .to the bottom of the slot 8 when the outer adjusting bolts 10 are loosened, and one of the bars 12 is removed. The knife may then be taken out of the machine, ground or dressed and returned to its correct position without the employment of skilled labor and without the necessity of accurately regauging the cutting edge of the knife with respect to the drum knives.

By the means above described we have produced a simple and relatively inexpensive knife-adjusting means for cutting and shredding machines: and the like, all of the adjusting parts beingv external to the machine and conveniently located soasto be accessible without removing part of the easlIl i J a d lxtremely accurate adjustment can .be easily effected without the necessity of taking accurate clearance measurements, I because .the setting of the inner setof stopslO determines the working position of the cutting edges of the stationary knives.

The stationary knives can moved by simply withdrawing them sidewisefrom the casing and as easily replaced.

Having thus described our invention, what be easily re- I we claim and desire to secure .by Letters Patent is: 1 I

1. In a cutting machine including a revolvable cylindrical knife-carrying drum, a

knives removably casing and stationary.

mounted therein, saidcasing formed with openings in the end walls thereof, the ends of said stationary knives projecting through said openings and outside of said walls, lugs on said walls adjacent said-openings,ad-

justable stops on said lugs adapted to engage .1

respectively the inner said stationary knives,

cured to said lugs and spanning said open ings, and an adjustable-stop carried by said:

against theyend, of

bar and adapted to abut said stationary knife.

and outer edges of a bar. removably se- 2. In a cutting machine including arevolvable cylindricalknife-carrying drum, a casing and stationary knives removabliy mounted therein, said casing formed with openings in the end walls thereof, the ends of said knives projecting through said;open-' ings and outside of said-walls, adjustable stops on said walls ends and the innerand outer, edges 'of said stationary knives, and a clamping boltfcaradapted to engage the ried by said wall and adapted to abut against,

the side of said'stationary'knife to force the knife against the wall of said opening. 11 I In testimony whereof, we affix our signatures.

. PHILIP S. MITTS.

WILLIAM J. INSTON.

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