US1446016A - Cutter head - Google Patents

Description

Feb. 20, 1923.

R. Ff MORITZ CUTTER HEAD Filed Oct 8, 1921 1 ATTORNEYS Patented Feb. 29, 1923.

mm m om ROBERT F. MORITZ, or caiannn, NEW JERSEY, essienon r0 seiaonr -M,

COMPANY, 013 CAMDEN,

Jansen-Mi oonrone'rron or new rfansnr,

; onr'rnn linen,

fippl ieation filed Getober 8,1921. Serial "as. 505,328."

To aZZ whom it may concern Be it known that I, ROBERT F. Monrrz,

a citizenuof the United States. and resident of Camden, in the county of Camden and State of New Jersey, have invented certain new and useful Improvements in Cutter Heads, of which the followingis a specification. n o This invention is an improvement in cutter heads adapted to be secured to a rotary shaft or other supporting element and r0- tated in juxtaposition to a cooperating cutter' or other element for slitting, trimming, or scoring sheet material. The invention relates particularly to the means employed for securing the cutter in position and permitting of its adjustment lengthwise of the shaft, and includes-an expansible and 'contractible split collar to carry thecu tter.

In constructions of this type heretofore employed, it has becircustomary tobore the split ringor collar to an internal diameter slightly larger than the external diameter of the shaft. so that when in non-flexed condition it could be vmoved freely along the shaft to the desired point and then coni'racted by bringing togetherthe free ends at the slit to grip the shaft. In" such construct-ions the collar does not fier: uniformly during); the contraction and thus tends to engage the shaft non-uniformly or at a few spaced points Furthermore, the collar when in normal or operative position is in distorted condition with. the metal under strain. After it has remained clamped in place for a considerable length of time the metal often becomes set and the releas ing of the connecting screw at the slit does not result in the return of the collar to ex panded or non-flexed position, In thatcase it is a difficult operation to force the collar open or drive it along the shaft in making;

an adjustment. Furthermore. the non-synr metrical contractio often brings thocutter blade slightly eccentric or springs it 01 produces nmlesirahle bending strains in it.

In carrying out my invention I form the collar aperture of substantially the same diameter as the shaft, so that with the parts in normal or unfiexed condition, the collar its the shaft friction tight and uniformly about the entire circumference.- "lhe connecting means en'iployed is'so designed that it acts to flex the collar by expanding i'tlo cured.

a larger diameter,.rather than contract-ind it; Thus the connecting means may be op 'ated to expand the collar to? a largerdiameter pern'iitting free longitudinal movement of the collar along the shaft; and then may be operated to relieve the collar of tensionand the collar will contract to tightly and umformly fit the'shaft. A further operation of the connecting member serves to" tightly clamp the collar in place and prevent any expansion '01- loosening. Thus the. collar when in normal clamped and operating position is not under anymaterial flexing strain, truly concentric with the shaft, is: held by uniform and. extensive surfacecontact with the shaftpand' does notremain in'a flexed condition vfor any appreciable time, so that the resilience is not destroyed.

In the accompanying drawings illustrated one embodiment of my intention. In'these drawings, 4 v Figure l is'anend' view,- i l 19;. Qis a transverse section oirthe'line, 22 of Fig 1, 1

l igs. 3 and l are sectional Ci'GtEIllS'OZ L a" larger scale, and I v Fig, 5 is a sectional detail similar to Fig.

3, but showing a slight modification.-

In my improved eonstruction'there is em ployed a'split ring or collar 10 to which. the circular cutter blade 11 is detachably se At the two free ends 12 and 13 of the split ring thereis normally a narrow gap or opening; due to the-thickness of the saw or other tool, in making thecut. These I two ends are. secured together by a screw 14; having threaded engagement with they end 12 and extending through an aperture in; a lug or transverse flange portion 15 of 1* have the other end, The aperture. is" slightly larger than the screw so as to form. aelear once. Thescrew is provided with ahead 16 and directly .iirthe rear of this. head thereprovided a stop or transversenhut merit-17'preventing onlimiting the endwise movement of the screw in respect to the end 13. -This aliiutment'may be secured inipo; sijtion after the screw has been put in place, and may be driven into slotsmto hold by friction, I or "may be" soldered "or ,.welded in place. The screw head is so formed that the screw may be rotated, any [suitable means being provided for this purpose." Prefcn ably the screw head has a. socket 18 into which the end of a suitable key may be extended. If the stop or abutment 1'? extend substantially across the entire screw head, then the abutment has an aperture 19 as shown in Fig. 3 and in alignment with the socket 18 so that the key may be inserted through the stop into the socket. In some constructions the stop may be acompalra tively low, as shown at 17 in Fig. 5, so that it covers only a portion of the screw head, and in that case it is not necessary to have any openingthrough it. The cutter is preferably secured to the split ring b screws 20, three being sufficient, and these are so spacedas to interfere tothe least possible extent with any expansion or contraction of the split ring. The internal diameter of the split ring is bored substantially the same as the external diameter of the shaft to which the ring is'to be applied. Before putting on the shaft, the screw 14 is rotated so that the head is forced against the stop 1'? andthe resulting reaction acts to separate'the ends 12 and 13 and expand the ring. In this expanded condition it may he slipped freely along the shaft to the desired position. By then retating the screw in the opposite direction the split ring or collar is permitted to re- .turn to normal position and to tightly fit the exterior of the shaft. By further turning the screw, the two ends 12 and 13 may be drawn'tit'htly together and the cutter head locked in place.

It will be, noted that in my improved construction the split ring when in normal. and operative position is not flexed or bent from normal, and snugly and uniformly fits the shaft. The only distortion or bending of the split ring is a temporary one occurring only during the adjustment of the cutter head,.instead of a practically continuous one, as in prior constructions. Furthermore, any bending; strains or warping of the cutter blade itself occurs only during adjustment, and the cutter blade is not subjected to bending or distorting strains when the collar is tightened and the parts are in position for use. 7

Although I have illustrated the innersurface or diameter of the ring; one continuous and substantially complete cylindrical surface it will of course be evident that this is not essential and that the internal surface of the ring which engages with the sliaft may be made up of a series of spaced surfaces, all with the same radius and center.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is I 1. A cutter head including a split ring having free ends and when in non-flexed position presenting an inner curved surface adapted "to snugly lit a supporting shaft, a. cutter blade secured to said ring and a screw carried by one of said free ends and adapted to spread said ends apart and forcibly expand the ring to facilitate the adjustment of the cutter head lengthwise of the shaft. 2. A cutter head including a split ring having free ends and when in non tlexed position presenting;- an inner curved surface adapted to snugly lit a supporting shaft, a cutter blade secured to said ring, and a screw carried by one ofsaid free ends and adapted to spread said ends apart and forcibly expand the ring to facilitate the adjustment of the cutter head lengthwise of the shaft,

' and also adapted to draw said ends together to lock the ring on the shaft.

' 3. A cutter -hcad including a split ring having; free ends and when in IlOI'lfflCXQCl position presenting an inner cylindrical snr-- face of the same diameter as the external surface of the supporting shaft; a cutter blade secured to said ring and a screw having threaded engagement with one end "and having a portion held against endwise movement in respect to the other of said-ends, whereby the rotation of the screw in one direction acts to forcibly expand the ring to facilitate the adjustment of the cutter head lengthwise of the shaftr 4;. A cutter head including a split ring having free ends, a cutter blade secured to said ring, and a screw having; threaded en g'agement with one of said ends and e:-;tend.- ing through an aperture in the other of said ends, and having a head larger than said aperture, and said last mentioned end having" a stop in the rear of the head whereby said screw when rotated inone direction may apply expandingpressure on said ring.

5. A cutter head including a split ring presenting; an internal cylindrical surface of a normal diametersubstantially the same as the external diameter of the supporting shaft. and means for expanding said ring to facilitate longitudinal adjustment of the cutter head along the shaft, including a screw having threaded engagement with one portion of said ring and held against lengthwise movement in respect to another por tion of said ring.

6. A cutter head including: an cxpansible and contractihle split ring which when in normal non-flexed condition presents an internal diametersubstantially equal to the external diameter of the supporting shaft whereby when in normal operative position the metal of the ring; isin substantially nonflexed condition, means for expandin the ring: to larger diameter by a flexing of the metal thereof to facilitate longitudinal adjustment of the cutter head, and acutter blade secured to said ring.

Signed at Camden in the county of Camden and State of New Jersey this 27th day of F eptember .s\. l). 1921 v

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