Stud for a doctor blade holder in a fiber web machine and doctor blade assembly for a fiber web machine

A doctor blade assembly for a fiber web machine, the assembly comprising:

• a doctor blade holder and a rail structure with a plurality of consecutive studs, wherein the doctor blade holder is arranged movable to the rail structure with a plurality of consecutive studs having a body with a flange, the rail structure for mounting the doctor blade holder within a rail fixed to a doctor beam, the rail structure extending in a cross-machine direction and having a cross-machine direction extending channel, wherein the majority of the studs comprise:
• a body having an upwardly extending central section with a threaded bore and an integrally formed flange which extends outwardly from the central section, the flange being non-round for engagement by a tool, the threaded bore being configured to receive a fastener extending into a portion of the doctor blade holder to retain the doctor blade holder to the stud, such that the stud retains the doctor blade holder to the rail when inserted within the rail channel;
• and
• wherein at one end of the rail structure there is a slide bar equipped with a handle which extends outside the rail structure.

An assembly for the removable mounting of a doctor blade to a doctor back within a fiber web machine, the assembly comprising:

• a doctor blade holder having structure for retaining a doctor blade which extends in a cross-machine direction, the doctor blade holder having a plate with an underside and portions defining holes therein;
• a rail structure for fixed mounting to the doctor back, the rail structure having two opposed rail parts with portions defining a channel which extends in the cross direction, the rail structure rail parts having opposed lips which extend towards one another in the machine direction into the channel, wherein each rail part has an upwardly protruding outer member positioned outwardly of the rail part's lip, each outer member having an upper surface which engages the plate underside, and each lip having a lip upper surface which is spaced below the upper surface of the rail part outer member;
• a plurality of studs which connect the doctor blade holder to the rail structure and which extend downwardly into the channel of the rail structure, wherein each stud has a body with an upwardly extending central section with a top portion which extends into one of the plate holes, the central section having a threaded bore, wherein the top portion protrudes above a circumferential shoulder positioned above an integrally formed flange which extends outwardly from the central section, the flange being non-round for engagement by a tool, and a cylindrical rotating piece disposed on the body to rotate about the central section above the flange and between the lips of the rail structure, wherein the circumferential shoulder extends a first distance above the flange;
• fasteners extending through the doctor blade holder plate holes into each of the threaded bores of the studs to fasten the doctor blade holder to the studs;
• and
• wherein each rotating piece has a vertical height above the stud flange which is less than the first distance, thus a gap is defined between the rotating piece and the underside of the plate allowing the rotating piece to rotate freely.

An assembly for the removable mounting of a doctor blade to a doctor back within a fiber web machine, the assembly comprising:

• a doctor blade holder having structure for retaining a doctor blade which extends in a cross-machine direction;
• a rail structure for fixed mounting to the doctor back, the rail structure having portions defining a channel which extends in the cross direction, the rail structure having two opposed lips which extend towards one another in the machine direction into the channel;
• a plurality of studs fixed to the doctor blade holder and extending downwardly into the channel of the rail structure, wherein each stud has a body having an upwardly extending central section with a threaded bore and an integrally formed flange which extends outwardly from the central section, the flange being non-round for engagement by a tool, and a cylindrical rotating piece disposed on the body to rotate about the central section above the flange and between the lips of the rail structure;
• fasteners extending through the doctor blade holder into each of the threaded bores of the studs to fasten the doctor blade holder to the studs;
• and
• a slide bar having a handle with a through hole extending vertically, the slide bar being fixed beneath the doctor blade holder and having portions which extend into the channel of the rail structure, the handle extending outwardly of the rail structure.