# US 9,518,359 B2 · Doctor blade holder systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,359 B2 - Document ID: US9518359B2 - Status: Granted - Kind: B2 - Application number: 14/534,959 - Filed: 2014-11-06 - Published: 2015-05-07 - Granted: 2016-12-13 - Earliest claimed: 2013-11-06 - Assignees: Kadant Inc. - Applicants: Kadant Inc. - Inventors: Allen Brauns; David Leeman; Robert Johnson - Web page: https://patentgrep.com/patent/US9518359B2 ## CPC - D21G 3/04: for drying cylinders - B31F 1/145: {Blade constructions} - D21G 3/005: {Doctor knifes} - D21G: CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES (winders or rewinders for finished products, means for adjustment of wrinkles or lateral extensions B65H) - B31F: MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making layered products not composed wholly of paper or cardboard B32B) ## Abstract The invention provides a doctor blade holder system that includes a doctor blade support structure, an adjustment profiling plate, and a series of adjustment mechanisms. The doctor blade support structure includes an elongated slot for receiving a doctor blade and a separate elongated slot to house mounting hardware. The adjustable profiling plate causes pressure to be applied to the working blade in a continuous manner along the length of the working blade, wherein the profiling plate is mounted to a holder mounting plate with a series of pairs of mounting structures allowing unconstrained flexure, or rotation, of the profiling plate with respect to holder mounting plate around two axes. The series of adjustment mechanisms attach to the holder mounting plate and acting on the profiling plate, wherein the adjustment mechanisms are capable of displacing the profiling plate in a bi-directional manner. ## Claims ### Claim 1 A doctor blade holder system, comprising: a. a doctor blade support structure that includes an elongated slot for receiving a doctor blade and a separate elongated slot to house mounting hardware; b. an adjustable profiling plate that causes pressure to be applied to a back-up blade, that in turn causes pressure to be applied to the working blade in a continuous manner along the length of the working blade, wherein the profiling plate is mounted to a holder mounting plate with a series of pairs of mounting structures allowing unconstrained flexure of the profiling plate with respect to holder mounting plate; and c. a series of adjustment mechanisms attached to the holder mounting plate and acting on the profiling plate, wherein the adjustment mechanisms are capable of displacing the profiling plate in a bi-directional manner. ### Claim 2 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure is directly connected to the holder mounting plate of the doctor beam. ### Claim 3 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure is directly connected to the profiling plate. ### Claim 4 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure is segmented. ### Claim 5 (depends on 4) The doctor blade holder system of claim 4, wherein a load-bridging element extends from one segment to the next and serves to align the facing ends of adjacent segments. ### Claim 6 (depends on 1) The doctor blade holder system of claim 1, wherein the profiling plate is segmented. ### Claim 7 (depends on 6) The doctor blade holder system of claim 6, wherein a load-bridging element extends from one segment to the next and serves to align the facing ends of adjacent segments. ### Claim 8 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure includes one or more integrated wear bars extending along the length of the doctor blade support structure, and wherein the wear bars are positioned to contact the doctor blade during its' insertion, removal and during operation. ### Claim 9 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure is coated with a hard coating to minimize wear due to contact with the working blade. ### Claim 10 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure is coated with a release type coating to minimize the build-up of process contaminants. ### Claim 11 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure is fitted with a doctor blade cartridge. ### Claim 12 (depends on 11) The doctor blade holder system of claim 11, wherein the spacer elements internal to the doctor blade cartridge can be fixed at various heights to accommodate a range of working blade widths. ### Claim 13 (depends on 11) The doctor blade holder system of claim 11, wherein the doctor blade cartridge contains load sensing and/or vibration sensing elements capable of sensing the static and/or dynamic load transmitted through the doctor blade. ### Claim 14 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure consists of one or more extruded aluminum elements. ### Claim 15 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure consists of one or more fiber reinforced plastic composite elements. ### Claim 16 (depends on 1) The doctor blade holder system of claim 1, wherein the doctor blade support structure contains load sensing and/or vibration sensing devices capable of sensing the static and/or dynamic load transmitted through the doctor blade. ### Claim 17 (depends on 1) The doctor blade holder of claim 1, wherein the back-up blade is made from a metallic material. ### Claim 18 (depends on 1) The doctor blade holder system of claim 1, wherein the back-up blade is made from a composite material. ### Claim 19 (depends on 1) The doctor blade holder system of claim 1, wherein the thickness of the back-up blade is 0.025 inch to 0.250 inch. ### Claim 20 (depends on 1) The doctor blade holder system of claim 1, wherein an equalizing tube is included and acts on the back-up blade to minimize the contact load variation between the back-up blade and working blade along the full length of the working blade. ### Claim 21 (depends on 20) The doctor blade holder system of claim 20, wherein the equalizing tube is filled with a viscous liquid. ### Claim 22 (depends on 20) The doctor blade holder system of claim 20, wherein the equalizing tube is of a solid, resilient material such as an elastomer. ### Claim 23 (depends on 1) The doctor blade holder system of claim 1, wherein a full-length clamping bar is included and is located in the elongated mounting slot of the doctor blade support structure. ### Claim 24 (depends on 1) The doctor blade holder system of claim 1, wherein a segmented clamping bar is included and is located in the elongated mounting slot of the doctor blade support structure. ### Claim 25 (depends on 1) The doctor blade holder system of claim 1, wherein a cap with internal threads is attached to the adjustment mechanisms and tightened to hold the adjustment mechanisms in the desired position, and which prevents process contaminants from interfering with the adjustment mechanism. ### Claim 26 (depends on 1) The doctor blade holder system as claimed in claim 1, wherein each of the pairs of the series of pairs of mounting structures, includes mounting structure elements, each mounting structure element of each pair having a mutually complementary curved surface that is adapted to move with respect to the curved surface of the other mounting structure element of each pair. ### Claim 27 (depends on 26) The doctor blade holder system as claimed in claim 26, wherein one mounting structure element of each pair of mounting structures is fixed to the profiling plate. ### Claim 28 (depends on 1) The doctor blade holder system as claimed in claim 1, wherein the profiling plate include one of a longitudinal fulcrum or ridge. ### Claim 29 A doctor blade holder system, comprising: a. a doctor blade support structure that includes an elongated slot for receiving a doctor blade and a separate elongated slot to house mounting hardware for attaching the doctor blade support structure to a holder mounting plate; b. a plurality of adjustment mechanisms attached to the holder mounting plate and acting on a profiling plate; where the adjustment mechanisms are capable of displacing the profiling plate relative to the holder mounting plate and wherein the profiling plate acts on a back-up blade to transfer force to the doctor blade; and c. a plurality of movable attachment mechanisms for attaching the doctor blade support structure to the holder mounting plate yet permit the profiling plate to move with respect to the holder mounting plate.