US2581470A - Cutter - Google Patents

Description

Jan. 8, 1952 w. P. DOOLEY 2,581,470

CUTTER Filed Aug. 25, 1947 l 7 /6/ l/ Hf L I I v INVENTOR. W/LL/AM P DOOLE) Patented Jan. 8, 1952 'pmrap STATE-S nrnsirrv OFFICE William P. Dooley, St. Albans, W. Va., minor to American Viscose Corporation, Wilmington, Del., a corporation of Delaware Application August 25, 1947, Serial no. 770,405

1 Claim. (cl. 164-38) l T This invention relates to a cutting device and is particularly concerned with maintaining a cut-' ment. Since it is characteristic of resilient means,

such as a helical spring, that the stress is proportional to the strain, it is clear that when such resilient means is backed up by a fixed ele-- ment and undergoes a large strain or deformation, either compression or extension, the force urging the members together may become excessivelyhigh and subject the parts to extreme wear.

. In accordance with the present invention, one of the cutter or shearing members is urged against the other by resilient means and such resilient means is backed up by floating means. which may for example be gravitationally urged against the resilient means. In this manner, the force applied through the resilient means is more evenly controlled and is relatively constant except for momentary fluctuations which may occur occasionally but even when such fluctuations occur, they do not cause such excessive stresses as heretofore since they are controlled by the inertia of the moving parts and particularly of the wfloating means which backs up the resilient means. Other objects andadvantages of the invention will be apparent from the drawing and the description thereof hereinafter.

tratively shown as a disc 3 mounted in a bearing 4 for rotation by means of a shaft 5 and a pulley 6. This. shear member is provided at the top with a generally concentric entrance I for the material to be out, which may take the form of endless filaments, or large or small bundles thereof, yarns, strands, cords, or even relatively thick strips of material of indefinite length. The entrance communicates with a radialpassage 8 terminating in an opening 9 in the periphery of the disc 3.

The cutter member comprises a knife I ll secured within a holder ll formed in the end of a projecting arm l2 extending from a bearing sleeve II which is secured to a post It by means of a set screw IS. The post it is mounted within a bearing sleeve 13 in a bracket ll, which bracket also has an arm l8 extending outwardly to support a bracket l3 which may be secured thereby by means of cap screws 20. To the other end of the post there is secured an arm or bracket 2i by means of a set screw 22. The outer end of the bracket 2| is provided with a socket or housing 23 which in turn is provided with a cap 24 threadedly secured thereon. Within the socket 23 a hollow sleeved member 25 is provided, about the sleeve of which a coil spring 26 is disposed. An element 21 is slidable within the recess of the socket and may be provided with two projecting splines 28 which fit within ways 23. The element 2'! bears against one end of the spring 26 and isadjustably secured to a rod 30 which extends freely through an opening 3| in the cap 24 and within the hollow portion of the sleeved fitting 25. The bearing element 21 may be moved from different adjusted positions by looseningthe set screw 32, rotating the rod 30 which has threaded engagement with the element 21 and retightening the set screw 32 when the desired adjustment is attained.

The bracket l9 may bemade in the form of a yoke as shown clearly in Figure 1 so that a lever 33 can be pivotally supported by the pin 34 extending into the two arms of the yoke I9 on each side of the lever 33. The rod 30 terminates in a rounded bearing portion 35 against which one face 33 of the lever 33 may bear. The lever 33 has a threaded portion 31 upon which a weight 38 may be secured as by means of the lock nuts '39 and 40.

In operation, the material to be cut is fed into the entrance 1 and passes out through the opening 9, while the disc 3 is rotated by means of the pulley 6. Such rotation may be at various speeds including such as will develop sufflcient centrifugal force within the material proceeding through the passage 8 as to thereby constitute the sole feeding force of the material through the device. On the other hand, rotation may be at somewhat lower speeds and in that case, the feeding of the material through the disc may be assisted by directinga blast of fluid, such as air or water, into the entrance I along with the material, as is conventional. Periodically, the material projecting outwardly from the disc is cut by the knife in as the opening 9 passes such knife. When the material strikes the knife it! it exerts a force tending to swing the knife away from the disc and the shock of this force is partially absorbed by the spring 26 and partially transmitted to the floating lever 33. However.

it will be 'noted that the force is always maintained within controlled limits as determined by the inertia characteristics ofthe mounting and particularly of the floating system of which the weight 38 is the most important part. While the spring 26 may undergo a momentary compres sion while the impact is transmitted to the floating system, it is quickly restorted to dynamic equilibrium in which the force exerted upon the knife and urging it against the shear member 3 is substantially the normal value, This results because of the movement allowed by the bearing member 21' backing up the spring so that the spring does not undergo as great a strain or deformation as it would ,have had to do were the member 2] held in flxedposition. It will also be noted that when the diameter of the disc 3 is reduced because of wear, it is unnecessary to re-adjust the knife mounting since the same force is exerted upon the knife regardless of its angular disposition about the post It. Even if, as a result of such wearing of the periphery, it

is necessary to adjust the setting of the knife I 0 within the holder II in order to maintain a desired angular relationship between the knife I0 and the'dlscl such adjustment can be made without necessitating a re-adjustment of the resilient means. ,Thus it is seen that the present invention avoids human error that could occur in re-adjusting the resilient 'tensioning means. I It is to be understood that-changes and variations may be made without departing from the spirit and scope of the invention as defined in the appended claim.

I claim:

. A cutting device for cutting continuous illamentary material to discbntinuous lengths comprising a disc-shaped shear member :having a channel extending therethrough to guide a strip element movably mounted on the arm. resilient means interconnecting the element and arm for resiliently transmitting force from the element to the arm, and a weighted lever for urging the element against the resilient means, said lever being pivotally mounted on an axis transverse of the axis of the shaft;

' 1 WILLIAM P. DOOLEY.

REFERENCES CITED The following references areof record in the flle of this patent:

UNITED s'rA'ras PATEN'IIS Number Name Date 910,325 Sill Jan. 19, 1909 1,798,806 Pfeiffer Mar. 31, 1931 2,424,555 'Curtis July 29, 1947

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