Cutting – Rotatable disc tool pair or tool and carrier – With means to permit replacement of tool
Reexamination Certificate
1999-06-29
2001-05-08
Rada, Rinaldi I. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
With means to permit replacement of tool
C083S665000, C083S698410
Reexamination Certificate
active
06227092
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to a quick disconnect for a rotary mounted slitting knife and more specifically, to an actuator for simultaneously releasing a plurality of knife clamping members to facilitate rapid replacement of a knife.
Typically, a slitting knife is bolted to a rotating member. When a knife needs to be replaced for sharpening, the bolts must be removed and the production line must be shut down for the period that it takes to change the knife. A typical knife mounting has mounting pilots and a bolt hole circle on a flange for receiving the knife.
The U.S. Patent to Tidland et al. (U.S. Pat. No. 5,058,475) and the U.S. Patent to Newton (U.S. Pat. No. 5,198,892) both disclose retaining rings having elongated slots with enlarged end portions for engagement with bolts threaded into the hub and extending through the slots. The clamping ring and slots of Tidland et al. are best seen in FIG. 10 whereas the clamping assembly of Newton is best seen in FIG. 1. However, both of these patents require the loosening of each individual bolt before the retaining plate can be rotated and removed to allow replacement of the cutting blade.
The U.S. Patent to Kobayashi (U.S. Pat. No. 5,048,388) discloses a rotary knife assembly wherein the rotary knife is fitted on a reduced diameter portion of a flange. A resilient member is mounted on the flange for urging the rotary knife toward the flange portion and there is a shifting mechanism mounted on the flange for shifting the rotary knife in a direction away from the flange against the urging force of the resilient member. In the embodiment shown in FIG. 10, a hydraulic piston and cylinder arrangement is provided for moving a plunger member 35 into and out of engagement with the rotary knife to move it against the resilient member. However, the piston and cylinder arrangement is not disclosed for use with studs for simultaneously moving a plurality of studs out of engagement with a retaining plate to permit replacement of the rotary knife.
SUMMARY OF THE INVENTION
The present invention is directed to a quick disconnect arrangement for a rotary mounted slitting knife which is adapted to be clamped to a rotatable hub by means of a plurality of headed studs. The knife is in the form of an annular element having a plurality of locking slots. Several knife mounting studs are secured to an annular actuating member. By placing the knife over the studs so that the studs extend through an enlarged portion of each slot and rotating the knife to bring the shank of each stud into the smaller end of the slots, the actuating member can be moved to clamp the knife in place. The studs are mounted on an actuating member which is shifted axially thereby facilitating a rapid changing operation for the knife.
Further features and advantages of the invention will become more clearly apparent from the following description of some preferred embodiments of a construction element according to the invention, given by way of non-limitative examples with reference to the accompanying drawings.
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patent: 4909113 (1990-03-01), Ischenko et al.
patent: 4934238 (1990-06-01), Lauffer
patent: 5048388 (1991-09-01), Kobayashi et al.
patent: 5058475 (1991-10-01), Tidland et al.
patent: 5061129 (1991-10-01), Baudermann
patent: 5107737 (1992-04-01), Tagliaferri
patent: 5174184 (1992-12-01), Meeks
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Ivel Leonard
Stidsen, Jr. Kenneth
Dienes Corporation
Hall Melissa L.
Rada Rinaldi I.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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