Title of Invention

CHAMBERED DOCTOR BLADE ASSEMBLY FOR AN INK CLEANING UNIT OF A ROTARY PRINTING MACHINE

Abstract

Chambered doctor assembly for a fountain type inking unit of a rotary printing machine, comprising a doctor-blade carrier (1) which is provided with an ink channel (2) and to which two doctor blades (12) that can be set against an ink applicator roll are fixed parallel to each other and, together with the ink applicator roll, the doctor-blade carrier (1) and sealing pieces (7) of elastomeric material, which are held in their seats (6) at the ends of the said doctor-blade carrier (1) by claimping quick-action closures and rest an the doctor blades and on the ink applicator roll, bound a closed ink chamber, and lines for feeding ink into and out of the ink chamber, characterized in that the quick-action closures comprise pivotable latches (14).

Full Text

-1A- This invention relates to a doctor blade device for an ink cleaning unit of a rotary printing machine. The invention further involves a doctor blade device for an ink cleaning unit of a rotary printing machine consisting of a doctor blade support, provided with an ink channel, on which two parallel doctor blades that are adjustable in relation to a form [inking] roller are affixed and together with the form roller, the doctor blade support and packing pieces, which are made out of an elastomeric material and clamped adjacent to the doctor blade support, the doctor blades and form roller by the support - delimiting a closed ink compartment, and [also consisting of] lines for the transport of ink into and out of the ink compartment. In doctor blade devices of this type known in the art from DE 40 01 733 Al and DE 195 16 224 Al, the packing pieces are inserted in recesses of covers which are screwed to the end faces of the doctor blade supports. The elastomeric material packing pieces on the end faces, however, are wear parts that must frequently be replaced. In order to replace them, the covers on the end faces must be unscrewed and, after inserting new packing pieces on the doctor blade support, screwed back onto the doctor blade support, each time, requiring relatively costly maintenance work. The objective of the invention is to create a doctor blade device of the type specified in the introduction in which the packing pieces can be replaced quickly and easily. - 2 - According to the invention, this objective is accomplished with a doctor blade of the type specified in the introduction in which the packing pieces are held in their seats by clamping quick release closures. The quick release closures provided according to the invention can be opened and closed easily and quickly by hand, or with a simple tool, without unscrewing and screwing back on covers or retaining pieces, so that when a pieces wears out, it can be replaced more quickly and more easily. Appropriately, the quick release closures are made out of swinging latches. Each latch can be swivel-mounted on a pin at one of its ends on one side of each end face of the doctor blade support and have on its other end an open-ended slot cutout with which it can latch behind the head of a bolt located on the other side of the end face of the doctor blade support. In order to guarantee a good secure sealing of the packing pieces in their recesses, each latch can be pressed by a spring toward the end face of the doctor blade support. Recesses functioning as seats for the packing pieces are machined into the end face of the doctor blade support for this purpose. In another embodiment of the invention, intermediate plates are inserted between the outer sides of the packing pieces and the latches. These intermediate plates prevent the packing pieces made out of rubber or another elastomeric material from being damaged by the latch from its swinging -3- action. Appropriately, the intermediate plates have end faces that are shaped the same as the end faces of the packing pieces. The packing pieces can consist of molded parts with parallel sides which have roof-shaped inclined faces adjacent to the back sides of the doctor blades, and between them a cupped recess adjacent to the form roller. One embodiment of the invention is explained in greater detail with reference to accompanying drawings. In it is shown Fig.1 a perspective view of a doctor blade device with a packing piece pulled out, intermediate plates shown separately and latch in its opened position. Fig.2 an illustration corresponding to Fig.1 in which the packing piece is inserted into its seat. Fig.3 an illustration corresponding to Figures 1 and 2 in which the intermediate plate is moved toward its inserted position. Fig.4 an illustration corresponding to figures 1 through 3 in which the intermediate plate is inserted and Fig.5 an illustration corresponding to Figures 1 through 4 in which the latch is closed. The doctor blade device consists of a boot shaped doctor blade support 1, which is provided with an average length ink channel 2. The doctor blade support 1 is provided with roof-shaped inclined surfaces 3 on both sides of the ink channel 2 on which clamping pieces are clamped, which fasten the doctor blades 12 in the usual manner - 4- The doctor blade supports 1 are provided on their end faces 5 with recesses 6 that correspond to the shape of the bottom parts of the packing pieces 7. The packing pieces 7 are made out of molded pieces with parallel sides 8. On their sides opposite the parts embedded in the recesses 6, the packing pieces 7 have roof-shaped inclined surfaces 9 and between these a cupped recess 10, the curvature radius of which corresponds to the form roller (not shown). The roof-shaped inclined surfaces 9 of the packing pieces are adjacent to the bottom sides of the doctor blades 12 held with the clamping pieces 4. On one side of each end face, the doctor blade support has a bolt provided with a head 13, on which the latch 14, consisting of a somewhat trapezoidal shaped plate, is pivot-mounted through a hole. A ring 14 functioning as a support is affixed between the end face 5 and the latch 8 on the bolt. Relatively soft springs, which press the latch toward the end face 5, are inserted between the head 13 of the bolt and the latch 14. An additional bolt with a head 16 is screwed into the opposite side of each end face 5. These bolts have a shank part 17 between the end face 5 and the head 16, which functions as a support for the intermediate plate 18 like the ring 14. The intermediate plate has roof-shaped surfaces 19 and a cupped recess 20 on its upper edge, whereby its contours correspond to the end face sealing surfaces of the packing pieces 7. The plate 18 is provided with recesses 21 on its narrow sides, with which, in its inserted condition, it rests on the ring 14 and the shank part 17 that function as supports, as seen in Fig.4. After inserting the intermediate plate 18 in the manner seen in Fig.4, the -5- latch 14 is swung into its closed position, seen in Fig.5, in which it is hooked onto the shank of the bolt with its cut-out slot 24 in such away that it grips behind the head 16. In its closure position seen in Fig.5, the latch 14 lies adjacent to the intermediate plate 18 with spring pressure on it so that it secures each sealing piece 8 in its seat 6. The intermediate plate 18 is provided with a handle hole 25 for easier handling and removal. The latch 14 is provided with an outward bend 26 on its upper side for handling. - 6 - We Claim : 1. Chambered doctor assembly for an ink cleaning unit of a rotary printing machine, comprising a doctor-blade carrier (.1) which is provided with an ink channel (2) and do which two doctor blades (12) that can be set against an ink applicator roll are fixed parallel to each and together with the ink app1icator roll, the doctor-blade carrier (1) and sealing pieces (7) of elastomeric material, which are held in their seats (6) at the ends of the said doctor-blade carrier (1) by clamping quick-action closures and rest on the doctor blades and on the ink applicator roll, bound a closed ink chamber, and lines for feeding ink into and out of the ink chamber, characterised in that the quick-action closures comprise pivotable latches (14). 2. Chambered doctor assembly as claimed in claim 1, wherein each latch (14) is mounted at its one end on one side of the end (5) of the doctor-blade carrier (1) such that it can pivot about a pivot bolt and, at its other end, has a slot (24) which is like an elongated hold and runs into the open and with which it engages behind the head (16) of a bolt arranged on the other side of the end (5) of the doctor- blade carrier. - 7 - 3. Chambered doctor assembly as claimed in either of claims 1 and 2, wherein a latch (14) on the pivot bolt is pressed by a spring in the direction of the end (5) of the doctor-blade carrier (1) . 4. Chambered doctor assembly as claimed in one of claims 1 to 3, wherein recesses (6) forming seats for the sealing pieces (7) are machined into the ends (5) of the doctor-blade carrier (1). 5. Chambered doctor assembly as claimed in one of claims 1 to 4 wherein intermediate plates (18) are inserted in between the outer sides of the sealing pieces (7) and the latches (14). 6. Chambered doctor assembly as claimed in one of claims 1 to 5, wherein the sealing pieces (7) comprise mouldings with mutually parallel sides (8), which bear on the doctor blades (12) with end faces (9) beveled in a roof shape and between the said doctor blades (12), bear on the ink applicator roll with a shell-like recess (1). (S BANERJEE) of L S DAVAR & CO. Applicants Agent. Dated this 5th day of AUSUST , 1998. Chambered doctor assembly for a fountain type inking unit of a rotary printing machine, comprising a doctor-blade carrier (1) which is provided with an ink channel (2) and to which two doctor blades (12) that can be set against an ink applicator roll are fixed parallel to each other and, together with the ink applicator roll, the doctor-blade carrier (1) and sealing pieces (7) of elastomeric material, which are held in their seats (6) at the ends of the said doctor-blade carrier (1) by claimping quick-action closures and rest an the doctor blades and on the ink applicator roll, bound a closed ink chamber, and lines for feeding ink into and out of the ink chamber, characterized in that the quick-action closures comprise pivotable latches (14).

Documents:

01395-cal-1998 abstract.pdf

01395-cal-1998 claims.pdf

01395-cal-1998 correspondence.pdf

01395-cal-1998 desccription(complete).pdf

01395-cal-1998 drawings.pdf

01395-cal-1998 form-1.pdf

01395-cal-1998 form-2.pdf

01395-cal-1998 form-3.pdf

01395-cal-1998 form-5.pdf

01395-cal-1998 p.a.pdf

01395-cal-1998 priority document.pdf

1395-cal-1998-granted-abstract.pdf

1395-cal-1998-granted-claims.pdf

1395-cal-1998-granted-correspondence.pdf

1395-cal-1998-granted-description (complete).pdf

1395-cal-1998-granted-drawings.pdf

1395-cal-1998-granted-examination report.pdf

1395-cal-1998-granted-form 1.pdf

1395-cal-1998-granted-form 2.pdf

1395-cal-1998-granted-form 3.pdf

1395-cal-1998-granted-form 5.pdf

1395-cal-1998-granted-letter patent.pdf

1395-cal-1998-granted-pa.pdf

1395-cal-1998-granted-reply to examination report.pdf

1395-cal-1998-granted-specification.pdf

1395-cal-1998-granted-translated copy of priority document.pdf