WO1996015884A1 - A perforator wheel - Google Patents
A perforator wheel Download PDFInfo
- Publication number
- WO1996015884A1 WO1996015884A1 PCT/DK1995/000462 DK9500462W WO9615884A1 WO 1996015884 A1 WO1996015884 A1 WO 1996015884A1 DK 9500462 W DK9500462 W DK 9500462W WO 9615884 A1 WO9615884 A1 WO 9615884A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- teeth
- perforator
- wheel
- perforator wheel
- lateral faces
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
- B26F1/20—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material with tools carried by a rotating drum or similar support
Definitions
- the present invention relates to a perforator wheel for perforating thin materials, such as paper, and comprising a plurality of peripheral teeth interspaced by means of outer lateral faces bevelled so as to form a cutting edge.
- such perforator wheels are provided with a cutting edge along the periphery.
- the cutting edge is formed of a plurality of teeth interspaced by means of intermediate slots.
- a workpiece such as a sheet of paper
- said piece is fed in between the rotating perforator wheel and a support, usually a rotating roller.
- the cutting edge perforates the workpiece, the slots between the teeth forming non-slit portions on the workpiece between the comparatively longer slit portions.
- the workpiece is weakened along the line, in which the perforation was carried out.
- This weakening or perforation line is thus formed of a plurality of slit, narrow, elongated portions and intermediate, non-slit portions. Due to the weakening, the line of perforation may be used for severing the workpiece.
- the perforation line is narrow, i.e. the teeth need be sharp, and that the non-slit portions are short. It is thus commonly known to regrind the perforator wheel, when the cutting edges of the teeth are worn and no longer sharp.
- regrinding material are removed on both lateral faces of the symmetrical teeth, until said teeth are sharp once again. Having being been sharpened a few times, for instance three or four times, the height of the teeth is reduced to such a degree that continuous use of the perforator wheel results in complete severing of the workpiece instead of a perforation thereof.
- the known perforator wheels are thus discarded after three to four regrindings.
- US 3,978,753 discloses a perforator wheel formed as two mutually rotatable halves, whereby long cutting teeth and corresponding short slots are provided along the periphery.
- a perforator wheel is encumbered with the same short- comings as conventional perforator wheels, as said wheel also have to be discarded after three or four regrindings.
- the problem of accumulating residues also exists in these perforator wheels, the bottom of the slots being perpendicular to the plane of the cutting edges.
- the object if the present invention is thus to provide a perforator wheel of the above type, in which the shape of the teeth is such that more regrindings of the perforator wheel may be carried out than on the known perforator wheels, and in which the problem of the accumulating residues between the teeth is avoided.
- the perforator wheel according to the invention is characterised in that the length of the two lateral faces of the teeth is different from one another. This entails that the bottom of the slots between the teeth form an acute angle with the plane through the cutting edges of the teeth or in other words the bottom is not parallel to the axis of the perforator wheel. A perforator wheel is thus obtained, which only need be ground on the short face of the two lateral faces at sharpening, whereby more regrindings may be carried out than on known perforator wheels. This is a particular advantage in perforator wheels for the formation of so-called mini or micro perfora ⁇ tions, i.e.
- the first lateral face of teeth may be three and preferably essentially five times longer than the second lateral face.
- this embodi- ments has proved particularly advantageous.
- the bottom of the slots between the teeth are essentially parallel to the longest of the two lateral faces.
- a perforator wheel is hereby obtained, in which the radial tooth height is not altered at regrinding and in which the risk of residues from the paper accumulating in the slots between the teeth is minimized.
- the lateral faces may be rectilinear as seen in a radial cross-sectional view, whereby a perforator wheel, which is easy to sharpen, is obtained.
- the two opposing lateral faces may form an angle with each other at essentially 60°. In practice, integrity perforations are obtained at this angle.
- Fig. 1 is a partial, radial sectional view between the two teeth and a partial side view of a perforator wheel according to prior art.
- Fig. 2 illustrates the same view as in Fig. 1 of a perforator wheel according to the invention
- Fig. 3 is fractional view of the perforator wheel according to the invention seen from the left-hand side of Fig. 2.
- Fig. 1 illustrates a conventional perforator wheel 1 being provided with a plurality of teeth 2 having cutting edges 3 along the periphery.
- Each tooth 2 is provided with two faces of equal length and converging with each other in a radially outward direction.
- a slot 6 is provided between each pair of teeth 2a, 2b.
- Each slot has a bottom 7 being essentially perpendicular to a plane through the cutting edges 3 of the teeth, i.e. essentially parallel to the axis 9 of the perforator wheel.
- the perfora ⁇ tor wheel 1 is further provided with an axial through-going hole 8 adapted to receive an axle.
- Figs. 2 and 3 illustrate a perforator wheel 31 according to the invention in the same manner as the known perforator wheel 1 shown in Fig. 1.
- the perforator wheel is provided with teeth 32 forming the cutting edges 33.
- the teeth 32 have two lateral faces 34 and 35 converging in relation to each other in a radially outward direction.
- the lateral faces 34, 35 form an angle of essentially 30° to a plane comprising the cutting edges of the teeth.
- the length L34 of the first lateral face 34 is essentially longer than the length L35 of the second lateral face 35.
- a slot 36 is provided between each pair of teeth 32a, 32b. As it is evident from Fig. 2, the bottom 37 of the slot is essentially parallel to the longest face of the tooth 34. The height H 32 of the teeth is essentially 0.5 mm.
- the perforator wheel is further provided with a central, through-going hole 38.
- the perforator wheel 31 according to the invention is preferably made of a alloyed, hardened steel, such as UBH Arne .
- the perforator wheel according to the inven ⁇ tion is preferably used for paper, but may also be used for other materials, such a plastic.
- the perforator wheel may be provided with an optional number of teeth, said wheel usually having 25 to 94 teeth per inch.
- the edge life of the perforator wheel is generally about 500,000 A4 sheets.
- the known perforator wheel 1 is reground on both lateral faces 4, 5 and can be sharpened three to four times.
- the perforator wheel 31 according to the invention is only reground on the short lateral face 35.
- the perforator wheel according to the invention may be reground about twenty to twenty-five times.
- the tool life of a perforator wheel according to the invention is thus improved by five to six times relative to conventional perforator wheels.
- angles of the two lateral faces with the plane may thus differ through the cutting edges of teeth from one another and said faces may mutually form other angles than the said 60°.
- the long lateral face and the bottom of the slot need not be parallel to each other, but may form an angle with each other.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95938364A EP0793563A1 (en) | 1994-11-22 | 1995-11-22 | A perforator wheel |
AU39782/95A AU3978295A (en) | 1994-11-22 | 1995-11-22 | A perforator wheel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK132994A DK171435B1 (en) | 1994-11-22 | 1994-11-22 | A perforator |
DK1329/94 | 1994-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996015884A1 true WO1996015884A1 (en) | 1996-05-30 |
Family
ID=8103641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1995/000462 WO1996015884A1 (en) | 1994-11-22 | 1995-11-22 | A perforator wheel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0793563A1 (en) |
AU (1) | AU3978295A (en) |
DK (1) | DK171435B1 (en) |
WO (1) | WO1996015884A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1670620A2 (en) * | 2003-10-07 | 2006-06-21 | Douglas Machine, Inc. | Apparatus for perforating or slitting heat shrink film |
EP2894015A1 (en) * | 2013-12-24 | 2015-07-15 | ALS Automatic Logistic Solutions GmbH | Circular blade |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2424573A1 (en) * | 1973-05-25 | 1974-12-12 | Procter & Gamble | DEVICE FOR PERFORATING A RAIL-SHAPED MATERIAL |
US3978753A (en) * | 1976-01-12 | 1976-09-07 | Meaden Screw Products Company | Adjustable perforator wheel |
US3978752A (en) * | 1975-12-29 | 1976-09-07 | Meaden Screw Products Company | Intermittent perforator wheel |
CH592508A5 (en) * | 1974-12-14 | 1977-10-31 | Goebel Gmbh Maschf | |
WO1995005927A1 (en) * | 1993-08-25 | 1995-03-02 | Plastod S.P.A. | Device to punch plaster tapes |
-
1994
- 1994-11-22 DK DK132994A patent/DK171435B1/en not_active IP Right Cessation
-
1995
- 1995-11-22 EP EP95938364A patent/EP0793563A1/en not_active Ceased
- 1995-11-22 WO PCT/DK1995/000462 patent/WO1996015884A1/en not_active Application Discontinuation
- 1995-11-22 AU AU39782/95A patent/AU3978295A/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2424573A1 (en) * | 1973-05-25 | 1974-12-12 | Procter & Gamble | DEVICE FOR PERFORATING A RAIL-SHAPED MATERIAL |
CH592508A5 (en) * | 1974-12-14 | 1977-10-31 | Goebel Gmbh Maschf | |
US3978752A (en) * | 1975-12-29 | 1976-09-07 | Meaden Screw Products Company | Intermittent perforator wheel |
US3978753A (en) * | 1976-01-12 | 1976-09-07 | Meaden Screw Products Company | Adjustable perforator wheel |
WO1995005927A1 (en) * | 1993-08-25 | 1995-03-02 | Plastod S.P.A. | Device to punch plaster tapes |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1670620A2 (en) * | 2003-10-07 | 2006-06-21 | Douglas Machine, Inc. | Apparatus for perforating or slitting heat shrink film |
EP1670620A4 (en) * | 2003-10-07 | 2012-03-28 | Douglas Machine Inc | Apparatus for perforating or slitting heat shrink film |
EP1670620B1 (en) | 2003-10-07 | 2017-05-10 | Douglas Machine, Inc. | Apparatus for perforating or slitting heat shrink film |
EP2894015A1 (en) * | 2013-12-24 | 2015-07-15 | ALS Automatic Logistic Solutions GmbH | Circular blade |
Also Published As
Publication number | Publication date |
---|---|
DK171435B1 (en) | 1996-10-28 |
AU3978295A (en) | 1996-06-17 |
DK132994A (en) | 1996-05-23 |
EP0793563A1 (en) | 1997-09-10 |
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