Doctor blades
OwnerAke A. Booseinventor
Life of this patent
Estimating the term…
Abstract
A composite doctor blade assembly includes a length of steel strip 21, forming the doctor blade, and a similar but narrower back-up blade 22. The strips 21, 22 are clamped between a resiliently flexible carrier strip 23 and an arched resilient strip 24 held together under tension by ties 25 passing through apertures 23a, 24a. To make the blade assembly longitudinally flexible, the apertures are elongated. The plate 23 is clamped in a holder between an intermediate element 11 and a bottom element 12 with the interposition of an interchangeable cylindrical packing element 13. The top element 14 is channel shaped to provide extra rigidity.
Claims12
A doctor blade assembly comprising a resiliently flexible carrier plate, said carrier plate having a rearward mounting portion by which it is adapted to be clampingly mounted and a free forward portion, arched presser plate means extending along the carrier plate with its concave side directed towards the carrier plate, said presser plate means overlying only said forward portion of said ccarrier plate, a resiliently flexible doctor blade strip of constant thickness clamped between the outer edges of the carrier plate and the presser plate means and a row of ties passing through apertures in the carrier plate and the presser plate means to hold the presser plate means in a stressed condition to clamp the doctor blade strip, the apertures in the carrier plate and presser plate means being elongated to permit lengthwise movement of the ties relative to the carrier plate and/or the presser plate means.
An assembly according to any one of the preceding claims wherein a resilient flexible backing strip, narrower than the doctor blade strip, is located between the presser plate means and the doctor blade strip.
A holder and doctor blade assembly, comprising a top channel-like element having front and rear downwardly projecting flanges bearing on an intermediate element in the form of a plate of width greater than the top element, a bottom element having a plate portion which underlies the underside of the intermediate element, the bottom element having an upstanding rear flange which is disposed behind the rear flange off the top element and a depending front flange positioned below a forward region of the intermediate element, a resiliently flexible carrier plate having a rear portion which is clampingly positioned between the intermediate member and the plate portion of the bottom element, said carrier plate having a front portion which projects outwardly a substantial distance beyond the forward edge of the intermediate element, means for clamping the three elements together with the rear portion of the carrier plate clamped between the forward portions of the intermediate and bottom elements, arched presser plate means opposing the front portion of the carrier plate with its concave side directed toward the carrier plate, a resiliently flexible doctor blade strip of constant thickness resiliently clamped between the forward portion of the carrier plate and the presser plate means adjacent the outer edges thereof, said doctor blade strip projecting forwardly beyond said outer edges, and a row of ties passing through apertures in the carrier plate and the presser plate means to hold the presser plate means in a stressed condition to resiliently clamp the doctor blade strip therebetween.
Dependencies are inferred from the claim text.