EP1533039A2 - Rundes wellenförmiges Messer und Messerbaugruppe für Schredder - Google Patents

Rundes wellenförmiges Messer und Messerbaugruppe für Schredder Download PDF

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Publication number
EP1533039A2
EP1533039A2 EP04257244A EP04257244A EP1533039A2 EP 1533039 A2 EP1533039 A2 EP 1533039A2 EP 04257244 A EP04257244 A EP 04257244A EP 04257244 A EP04257244 A EP 04257244A EP 1533039 A2 EP1533039 A2 EP 1533039A2
Authority
EP
European Patent Office
Prior art keywords
blade
cambers
undulating
curvature
round
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04257244A
Other languages
English (en)
French (fr)
Other versions
EP1533039B1 (de
EP1533039A3 (de
Inventor
Simon Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michilin Prosperity Co Ltd
Original Assignee
Michilin Prosperity Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Michilin Prosperity Co Ltd filed Critical Michilin Prosperity Co Ltd
Publication of EP1533039A2 publication Critical patent/EP1533039A2/de
Publication of EP1533039A3 publication Critical patent/EP1533039A3/de
Application granted granted Critical
Publication of EP1533039B1 publication Critical patent/EP1533039B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C18/182—Disc-shaped knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0007—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/146—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with a rotor comprising a plurality of axially contiguous disc-like segments each having at least one radially extending cutting element

Definitions

  • the present invention relates to an improved cutting blade for a shredder, particularly to a round undulating blade that is integrally formed by punching a sheet metal in a punching die or a round undulating blade module that is integrally formed by die-casting.
  • the conventional shredders for cutting paper use a plurality of cutting blades and spacers engaging over a rotary cutter shaft, and the shearing force that two parallel and opposite rotary cutter shafts produce for transferring and cutting the paper-to-be-cut along a longitudinal direction into strips.
  • Shredders can be classed into two types, the stripe-cut shredders and crosscut shredders, according to the machine cutting style.
  • the former shredders arrange cutting blades to the rotating cutter shafts in a manner to cutting the paper in a longitudinal direction to form strips.
  • the later shredders include blades that include more than one cutting edge part, and each cutter is disposed helically along the rotary cutter shaft for first cutting paper along a horizontal direction into strips and then cutting paper along a longitudinal direction into approximate 4 mm ⁇ 40 mm paper chips.
  • the conventional blade is made by punching a sheet metal having a thickness of approximately 2 mm into a circular blade by a die.
  • the blade includes a polygonal central hole A1 through which a rotary shaft may pass.
  • the blade also includes cutting edges A2 that are spaced in about 120 degrees apart around the periphery. As shown, when two blades are arranged on the rotary shafts S in a back-to-back manner to combine into a set of blades A, the cutting edges of the two blades assume a V-like edge A3.
  • the opposite rotary shafts S' space the two blades apart by space rings (not shown) in a face-to-face manner to form a set of blade A'.
  • the opposing rotation of the periphery of the blades that is, flanks A4 and flanks A4 will cut the paper like scissors.
  • the opposing rotation of cutting edges A2 and the opposite flanks A4 will then cut the paper along a horizontal direction into 4 mm ⁇ 40 mm paper chips.
  • the blades are formed by a punch die, the die wear that increases with the time will reduce sharpness of the blade edges, which does not improve until replacing the die, to result in inconsistent quality. To ensure quality of the blades, it is necessary to shorten the service term of the die, which results in increment of the cost.
  • the thickness of the blade is the same as the width of paper to be cut. To ensure the strength of blades while cutting along the horizontal direction, the blades cannot be too thin, or else the blades tend to deform or fracture. Such a limitation attributes to the high material cost, which is less competitive as compared to the current market price.
  • the motor can supply a minimum power for cutting along the horizontal direction, that is, to reduce the power consumed by the motor.
  • the width of the paper cut by the conventional blades is 4 mm, the motor needs to output higher power to drive the blades and flanks moving in opposing directions to cut the paper along the horizontal direction smoothly.
  • this invention overcomes the shortcoming of the conventional blades.
  • It is a primary objective of the present invention is to provide a round undulating blade for shredders, that is integrally punched from a sheet metal in a die into a round undulating blade to effectively reduce the material cost and the weigh of the blade to thereby reduce the motor loading and power consumption.
  • It is a further objective of the present invention is to provide two sets of round undulating blade modules for shredders, each of which is constructed of a pair of integrally formed round undulating blades of round undulating blades that are arranged in a face-to-face and back-to-back manner, by die-casting, respectively.
  • It is another objective of the present invention is to provide a round undulating blade for shredders, that uses the varying curvatures of the round undulating blade to cut paper into paper chips each having a wider center tapering towards the ends, so as to reduce the power that that motor needs to output for cutting the two ends to thereby reduce the motor loading and the power consumption.
  • the present invention provides a round undulating blade for a shredder, the blade comprising: a periphery; an undulating blade flank, including at least two cambers having a first curvature and at least two cambers having a second curvature alternatively arranged with respect to the cambers having the first curvature; and hooked edges formed on the periphery of the cambers having the first curvature, wherein the undulating blade flank of the blade serves to cut paper along a longitudinal direction to form paper strips having double-tapering end, and the hooked edges serve to cut the strips along a horizontal direction into paper chips.
  • the present invention provides a round undulating blade module for a shredder, the blade module including two round undulating blades, each of the blades comprising: a periphery; an undulating blade flank, including at least two cambers having a first curvature and at least two cambers having a second curvature alternatively arranged with respect to the cambers having the first curvature; and hooked edges formed on the periphery of the cambers having the first curvature, wherein the undulating blades are arranged in such a manner that the cambers having the same curvature of each of the undulating blades face each other; and wherein the undulating blade flanks of the blades serve to cut paper along a longitudinal direction to form paper strips having double-tapering end, and the hooked edges serve to cut the strips along a horizontal direction into paper chips.
  • the round undulating blade for shredder is characterized in that the cambers are equally spaced or unequally distant from one another.
  • the round undulating blade for shredder is characterized in that the flank is formed with at least one rib protruding towards a direction opposing the curvature of the cambers at where the rib is formed.
  • the round undulating blade for shredder is characterized in that the at least one rib is formed on the cambers where no hooked edges are formed.
  • the round undulating blade for shredder is characterized in that the periphery of the blade is integrally formed into serration.
  • the round undulating blade for shredder is characterized in that the center of the blade is formed with a polygonal hole.
  • the round undulating blade for shredder is characterized in that the blade is made from a sheet metal punched integrally in a punching die.
  • the round undulating blade module for shredder is characterized in that the blade module is integrally formed by die-casting.
  • FIG. 3 to 6 where Figs. 3 and 4 illustrate the perspective and planar views of the present invention, respectively, and Figs. 5 and 6 are cross-sectional views taken from lines 5-5 and lines 6-6 in Fig. 4, respectively.
  • the above-mentioned views disclose a revolutionized cutting blade 1 for a shredder, which blade is able to provide an optimum sheet capacity based on the various types of shredders.
  • the present invention selects a sheet metal having a minimum thickness of about 0.3 mm as a raw material, the selected sheet metal is punched by a die into a blade including an undulating blade flank 12, formed into two cambers B' having a first curvature and two cambers B' having a second curvature alternatively arranged with respect to the cambers B having the first curvature.
  • the cambers B, B' are equally spaced apart from one another.
  • the cambers B, B' may also be equally spaced apart from each other, if needed.
  • the periphery 11, as shown in Fig. 3, of the blade is integrally formed into serration.
  • the periphery 11 of serration serves to pull the paper to be cut downwards along a longitudinal direction into strips.
  • the cambers B having the first curvature are integrally formed with hooked edges 13 on the periphery 11 thereof for cutting the strips along a horizontal direction into paper chips.
  • the cambers B' having the second curvature are not formed with any hooked edges.
  • a polygonal hole 16 is formed in a center of the blade 1, through which a rotary shaft may pass.
  • a blade is punched in a punching die to form an undulating blade flank 12 including two cambers B having a first curvature and two cambers B' having a second curvature alternatively arranged with respect to the cambers B having the first curvature, wherein the cambers B having the first curvature are integrally formed with hooked edges 13 on the periphery 11 thereof for cutting the strips along a horizontal direction into paper chips, and the cambers B' having the second curvature are not formed with any hooked edges.
  • Figs. 10-13 illustrate an embodiment of a round undulating blade 100 of the present invention having six cambers.
  • the round undulating blade 100 is punched in a punching die to form an undulating blade flank 112 including three cambers B having a first curvature and three cambers B' having a second curvature alternatively arranged with respect to the cambers B having the first curvature, as shown in Fig. 13, wherein the cambers B having the first curvature are integrally formed with hooked edges 113 on the periphery 111 thereof for cutting the strips along a horizontal direction into paper chips, and the cambers B' having the second curvature are not formed with any hooked edges.
  • the periphery 111, as shown in Fig. 10, of the blade is integrally formed into serration.
  • the periphery 111 of serration serves to pull the paper to be cut downwards along a longitudinal direction into strips.
  • Figs. 14-17 illustrate an embodiment of a round undulating blade 200 of the present invention having eight cambers.
  • the round undulating blade 200 is punched in a punching die to form an undulating blade flank 212 including four cambers B having a first curvature and four cambers B' having a second curvature alternatively arranged with respect to the cambers B having the first curvature (Figs. 16 and 17 only illustrate the cambers B), wherein the cambers B having the first curvature are integrally formed with hooked edges 213 on the periphery 211 thereof for cutting the strips along a horizontal direction into paper chips, and the cambers B' having the second curvature are not formed with any hooked edges.
  • the periphery 211 as shown in Fig. 14, of the blade is integrally formed into serration.
  • the periphery 211 of serration serves to pull the paper to be cut downwards along a longitudinal direction into strips.
  • the flank 12 may be formed with a plurality of ribs 50 protruding towards a direction opposing the curvature of the cambers, by punching, at where the ribs are formed, for enhancing anti-flexing capability of the blade 4.
  • the ribs 50 are formed on the cambers B' where no hooked edges are provided.
  • the ribs 50 may certainly be formed on the cambers B where the hooked edges 13 are provided
  • the standardized round undulating blades punched from a sheet metal by a die are arranged sequentially on a first and a second rotary shafts S, S' to be assembled into the rotary cutting tool that is most important for a shredder.
  • the round undulating blades are arranged in such a manner that the hooked edges 13 of two adjacent blades 1 are located at the same location, and the hooked edges 13 of the blades 1 on the first rotary shaft S interlace with the hooked edges 13 of the blades 1 on the second rotary shaft S'.
  • the two adjacent round undulating blades on the first rotary shaft S are arranged in such a manner where their cambers B having the hooked edges 13 face each other to form a first blade set; the two adjacent round undulating blades on the second rotary shaft S' are arranged in such a manner where their cambers B' without the hooked edges face each other to form a second blade set.
  • the first blade set and second blade set assembled by joining two round undulating blades to be mounted on the first rotary shaft S and second rotary shaft S', respectively, may be formed into an integral blade module by die-casting.
  • blade modules 60, 70 configured to each have the features of the first blade set or second blade set as described above, as shown in Fig. 18, may be die-cast from their respective dies.
  • the blade modules made by die-casting may accommodate heavy-duty shredders in exchange for their higher cost of manufacturing.
  • the first blade 21 and the second blade 22 on a first rotary shaft S are arranged in such a manner where their cambers B having the hooked edges 13 face each other to form a first blade set.
  • the flanks of the blades 21, 22 each include two cambers B having a first curvature and two cambers B' having a second curvature alternatively arranged with respect to the cambers B having the first curvature, the cambers B having the hooked edges 13 of the first blade 21 and second blade 22 join to contact each other while the cambers B' without the hooked edges of the first blade 21 and second blade 22 are separated from each other to assume an open space 23.
  • first blade 31 and the second blade 32 on the second rotary shaft S' are arranged in such a manner where their cambers B' without the hooked edges face each other to form a second blade set.
  • the flanks of the blades 31, 32 each include two cambers B having a first curvature and two cambers B' having a second curvature alternatively arranged with respect to the cambers B having the first curvature, the cambers B having the hooked edges 13 of the first blade 31 and second blade 32 are separated from each other to assume an open space 33, while cambers B having the hooked edges 13 of the second blade 32 and a first blade 31' of an adjoining second blade join to contact each other.
  • the standardized round undulating blades each including two cambers having a first curvature and two cambers having a second curvature alternatively arranged with respect to the cambers having the first curvature, enable the flanks of the corresponding blade sets to maintain a certain contact gap at all time by means of the varying curvatures of the blades.
  • the superposition of the blades arranged on different rotary shafts are constant. Such a constant superposition can ensure scissors like cutting effects between the flanks 12 when the two rotary shafts S, S' rotate in opposing directions (shown in Fig. 9).
  • the hooked edges 13 will cooperate with the flanks 12 on the cambers B' of the mating blades to cut off the paper strips.
  • the paper is fragmented into paper chips each having a wider center tapering towards the ends. Because of the two ends of the paper chip are the horizontal cutting positions, the narrower width of cross-section is, and the smaller output power is needed to cut along the horizontal direction.
  • the motor can supply a minimum power for cutting along the horizontal direction under a minimum load. The reduction in the motor load also reduces the power consumption and increases service-life of the motor.
  • the round undulating blade of the present invention may be punched from a sheet metal having a minimum thickness of about 0.3 mm, where the costs of the two materials are significantly different, and the reduced weight also helps to further reduce the power that the motor needs to supply to thereby increase the service life of the motor and reduce the power consumption.
  • the round undulating blade module made by die-casting may be easily manufactured. These characteristics all help to reduce the manufacturing cost and enhance the market competitiveness.
  • the present invention discloses a blade punched from a sheet metal, as well as a blade module that is die-cast to form blades.
  • each blade includes at least two cambers having a first curvature and at least two cambers having a second curvature alternatively arranged with respect to the cambers having the first curvature.
  • the periphery of the blade is integrally made into serration to serve as a flank for cutting paper along a longitudinal direction.
  • the periphery of the cambers having the first curvature is integrally formed with hooked edges for cutting the paper along a horizontal direction to form paper chips having double-tapering ends.
  • the revolutionized construction of the present invention reduces power consumption, material cost, and lessens motor load, so as to enhance the market competitiveness of the shredder.
EP20040257244 2003-11-24 2004-11-23 Rundes wellenförmiges Messer und Messerbaugruppe für Schredder Active EP1533039B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200320104395 2003-11-24
CNU2003201043957U CN2673503Y (zh) 2003-11-24 2003-11-24 碎纸机的圆形波浪式刀片及刀片模块

Publications (3)

Publication Number Publication Date
EP1533039A2 true EP1533039A2 (de) 2005-05-25
EP1533039A3 EP1533039A3 (de) 2005-10-05
EP1533039B1 EP1533039B1 (de) 2006-10-11

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Application Number Title Priority Date Filing Date
EP20040257244 Active EP1533039B1 (de) 2003-11-24 2004-11-23 Rundes wellenförmiges Messer und Messerbaugruppe für Schredder

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EP (1) EP1533039B1 (de)
CN (1) CN2673503Y (de)
DE (1) DE602004002747T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1658899A1 (de) * 2004-11-17 2006-05-24 Splendid Electronics (Shenzhen) Company Limited Messerpaare für Aktenvernichter
GB2435840A (en) * 2006-03-07 2007-09-12 Emily Lo A blade for a paper shredder
EP3278968A1 (de) * 2016-08-03 2018-02-07 SIB Strautmann Ingenieurbüro GmbH Rotor einer pressgutzuführeinheit einer presse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100181405A1 (en) * 2009-01-05 2010-07-22 Royal Appliance Mfg. Co.D/B/A Tti Floor Care North America Blade assembly for shredders of sheet-like material
CN104307611A (zh) * 2014-10-13 2015-01-28 东莞市微然机电科技有限公司 一种碎纸机刀片和刀棒

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5362000A (en) * 1992-10-27 1994-11-08 Hermann Schwelling Pre-comminuting and metering apparatus for paper shredders
US6168104B1 (en) * 1998-09-25 2001-01-02 Primax Electronics Ltd. Shredding module used in a paper shredder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5362000A (en) * 1992-10-27 1994-11-08 Hermann Schwelling Pre-comminuting and metering apparatus for paper shredders
US6168104B1 (en) * 1998-09-25 2001-01-02 Primax Electronics Ltd. Shredding module used in a paper shredder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1658899A1 (de) * 2004-11-17 2006-05-24 Splendid Electronics (Shenzhen) Company Limited Messerpaare für Aktenvernichter
GB2435840A (en) * 2006-03-07 2007-09-12 Emily Lo A blade for a paper shredder
GB2435840B (en) * 2006-03-07 2008-02-13 Emily Lo Blade for a paper shredder
EP3278968A1 (de) * 2016-08-03 2018-02-07 SIB Strautmann Ingenieurbüro GmbH Rotor einer pressgutzuführeinheit einer presse

Also Published As

Publication number Publication date
DE602004002747T2 (de) 2007-08-30
EP1533039B1 (de) 2006-10-11
CN2673503Y (zh) 2005-01-26
EP1533039A3 (de) 2005-10-05
DE602004002747D1 (de) 2006-11-23

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