Roll doctor apparatus

Claim 2

In combination with a roll, a roll doctor apparatus comprising a. a carrier; b. a flexible support of generally channel section mounted on the carrier for pivoting relative to the latter about an axis parallel to the length of the channel, the carrier having an edge portion which is received within the channel and the support comprising a generally Z-shaped member of sheet metal which has first and second approximately parallel flanges separated by a web integral therewith, and a member of sheet metal secured to the second flange and providing a third flange which forms, with the first flange, the side walls of the channel, the base of the channel being formed by the web; c. a flexible doctor blade mounted on the support to project externally of the channel and away from the carrier; d. a tube which is interposed between the said edge portion of the carrier and a side wall of the channel, the walls of the channel being substantially continuous and covering completely the said tube and the external surfaces of the channel being provided by smooth unribbed surfaces; and e. means for introducing fluid into the tube to expand it so as to pivot the support relative to the carrier and cause the doctor blade to engage the roll.

Claim 3

An apparatus as claimed in claim 1 wherein a pivot shaft is mounted on the carrier and the first flange of the generally Z-shaped member of the support is formed with a transverse groove of curved cross section which embraces said shaft.

Claim 4

An apparatus as claimed in claim 1 wherein at least one of the flanges defining the side walls of the channel is shaped so that the end thereof remote from the doctor blade is disposed nearer to the carrier than the remainder of the flange.

Claim 5

In combination with a roll, a roll doctor apparatus comprising a. a carrier; b. a mounting for the carrier; c. a flexible support having two spaced approximately parallel flanges joined by a web which extends approximately at right angles to said flanges and, with the latter, forms a channel, and a further flange which projects from the web in a direction away from the channel, the carrier having an edge portion which extends away from the mounting and is received within the channel; d. pivot means between said edge portion of the carrier and said support whereby the latter is mounted on the carrier for pivoting relative thereto about an axis parallel to the length of the channel; e. a flexible doctor blade mounted on said further flange of the support and extending in a direction away from the channel; f. a tube which is interposed between the said edge portion of the carrier and a wall of the channel, the walls of the channel being substantially continuous and overlying completely the said tube and the external surfaces of the channel being provided by smooth unribbed surfaces; and g. means for introducing fluid into the tube to expand it so as to pivot the support relatively to the carrier and cause the doctor blade to engage the roll.

Claim 6

In combination with a roll, a roll doctor apparatus comprising a. a carrier; b. a mounting for the carrier; c. a flexible support having two spaced approximately parallel flanges joined by a web which extends approximately at right angles to said flanges and, with the latter, forms a channel, and a further flange which projects from the web in a direction away from the channel, the carrier having an edge portion which extends away from the mounting and is received within the channel; d. pivot means between said edge portion of the carrier and said support whereby the latter is mounted on the carrier for pivoting relative thereto about an axis parallel to the length of the channel; e. a flexible doctor blade mounted on said further flange of the support and extending in a direction away from the channel; f. a tube which is interposed between the said edge portion of the carrier and a wall of the channel, the walls of the channel being substantially continuous and overlying completely the said tube and the external surfaces of the channel being provided by smooth unribbed surfaces; and g. means for introducing fluid into the tube to expand it so as to pivot the support relatively to the carrier and cause the doctor blade to engage the roll.