US3797765A - Paper shredder - Google Patents

Paper shredder Download PDF

Info

Publication number
US3797765A
US3797765A US00251800A US3797765DA US3797765A US 3797765 A US3797765 A US 3797765A US 00251800 A US00251800 A US 00251800A US 3797765D A US3797765D A US 3797765DA US 3797765 A US3797765 A US 3797765A
Authority
US
United States
Prior art keywords
discs
roll
rolls
disc
shredding
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.)
Expired - Lifetime
Application number
US00251800A
Other languages
English (en)
Inventor
A Samuels
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.)
Speed O Print Business Machines Corp
Original Assignee
Speed O Print Business Machines Corp
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 Speed O Print Business Machines Corp filed Critical Speed O Print Business Machines Corp
Application granted granted Critical
Publication of US3797765A publication Critical patent/US3797765A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B02C18/0007—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
    • B02C18/0007—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents
    • B02C2018/0069—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents with stripping devices

Definitions

  • ABSTRACT A shredding device for paper and other material capable of being torn having a pair of oppositely rotating rolls, each with a plurality of circular discs thereon ax ially spaced apart along the length thereof is provided wherein the discs 'on one roll are received within the spaces between discs on the other roll and spaced from the faces thereof, and one circumferential edge of certain ones or all of said discs has a radius to cooperate with sharp circumferential edges on an adjacent disc thereby tearing and shredding the material.
  • Comb teeth are located in the spaces between adjacent discs and are floatingly mounted to prevent jamming of the material being shredded.
  • a further object is to provide a shredding device wherein at least one circumferential edge of the shredding discs on at least one of the rolls is rounded and thereby provided with a radius, and which is positioned in assembled relation with the other roll so that the edge with the radius is positioned adjacent the face of a disc on the other roll, the circumferential edge of which is sharp.
  • Another object of the invention is to provide a shredding device wherein spaced shredding discs on one roll are received between spaced shredding discs on a cooperating roll, and comb teeth are floatingly mounted between the discs of each roll, thereby to enable an increase in the thickness of material being shredded without jamming.
  • the invention comtemplates a pair of rolls, each having a plurality of shreddng discs spaced along the length thereof with each disc of one roll extending into the space between the discs on the other roll, with each disc having two circumferential edges around its periphery, and wherein at least one of such circumferential edges of each disc on at least one of the rolls has a radius.
  • the discs are arranged so that the circumferential edge having the radius on one disc is positioned adjacent the face of a disc on the other roll which has the circumferential edge which is sharp.
  • FIG. 1 is a plan view of a pair of rolls having shredding discs thereon and combs associated therewith in accordance with the present invention
  • FIG. 2 is a transverse sectional view taken substantially along the plane of line 2-2 of FIG. 1;
  • FIG. 3 is a fragmentary enlarged plan view of the shredding rolls illustrating one form of the invention and showing the comb teeth in section;
  • FIG. 4 is an enlarged fragmentary view similar to FIG. 3 but showing a modified form of the invention.
  • FIG. 5 is a view similar to FIGS. 3 and 4 but showing a still further modified form of the invention.
  • the roll 1 comprises an elongated shaft 3 which preferably has an axially extending enlarged portion 4 on which a plurality of shredding discs 5 are mounted. These discs 5 are spaced apart axially along the length of the shaft 3 resulting in the spaces 6.
  • the other roll 2 has a shaft 7 with an enlarged portion 8 thereon on which is mounted a plurality of shredding discs 9, also in spaced apart relation thereby providing the spaces 10 therebetween.
  • the discs 5 are positioned so that the peripheries thereof are received within the spaces 10 on the companion roll. Likewise the discs 9 are received in the spaces 6 on the other roll.
  • the outer peripheries of the two sets of rolls thereby overlap in a well known manner and as shown in FIG. 2.
  • the peripheral surfaces of both sets of discs are preferably provided with friction means so that when paper or other material capable of being stretched and torn is placed in between the rolls as indicated by the arrow 11 the discs will grasp the material and pull it downwardly between the rolls.
  • the friction surface may be provided by any one of a number of ways.
  • each peripheral surface can be provided with axially extending teeth or ribs, or it can be knurled, or a suitable friction substance can be applied thereto. Providing such shredding discs with a friction surface is not novel, and forms no part of the present invention, and, therefore, need not be illustrated nor described in any greater detail.
  • the discs on one roll are not only received in the spaces on the other roll, but also the two sets of discs are positioned in axially spaced apart relation. This is necessary to enable the material being shredded to have sufficient room to pass between the rolls when it is being subjected to the tearing and shredding process.
  • each disc on its peripheral surface has two circumferential edges.
  • the discs 5 are shown as having such circumferential edges 12 and 13.
  • the discs 9 are shown as having the circumferential edges 14 and 15.
  • each of the discs on one roll is spaced from both faces of the discs on the other roll between which it is located.
  • the discs 5 within the spaces 10 have their side faces spaced from the adjacent discs 9 so as to provide the spaces 16 and 17.
  • the spaces 16 and 17 are preferably on the order of .006 inches, although this distance may be varied within desirable limits.
  • a feature of the present invention is the rounding of at least one of the circumferential edges of some or all of the discs on one or both of the rolls thereby providing a radius.
  • the circumferential edge 12 of the discs 5 has a radius, whereas the opposite circumferential edge 13 is relatively sharp.
  • the circumferential edges 14 on the discs 9 have a radius, whereas the circumferential edges 15 are likewise relatively sharp.
  • the radius of the circumferential edges 12 and 14 is too small, then the adjacent space between that edge and the adjacent face of the next disc will be so small that no advantage will be gained by having an edge with a radius. It is likewise true that if the radius is too large, then the tearing and stretching ability of that side of the disc will be impaired. It has thus been determined in actual practice that the radius of these edges should not be greater than approximately 0.010 inches.
  • Shredders of this type heretofore known have been unable to accommodate more than a few sheets of thin paper at one time, and if more than such maximum number of sheets is placed within the rolls they will become jammed and the motor will stall. While the material most commonly used to be shredded will be paper, it is, of course, understood that other material capable of being stretched and torn may also be shredded in this apparatus. Paper is normally considered to have a thickness anywhere from 0.003 to 0.012 inches. In actual tests of the present machine as many as twelve sheets of paper having a thickness of 0.003 inches have been successfully shredded at one time. Another feature of the invention is the provision of combs associated with each of the rolls, the teeth of which are floatingly mounted and which are preferably made of a resilient material.
  • the teeth of the comb associated with roll 1 are indicated by the numeral 18, and similar teeth associated with the roll 2 are indicated by the numeral 19.
  • the configuration of these teeth may be seen by referring to FIG. 2.
  • the teeth 18 are mounted on the upper and lower supporting rods 20 and 21 suitably supported in the framework of the device.
  • the teeth 19 are similarly mounted on the upper and lower support rods 22 and 23.
  • each of the teeth 18 and 19 are provided with openings to receive the respective support rods, and such openings in the teeth have diameters slightly larger than the diameters of the rods upon which they are mounted.
  • the teeth 18 and 19 are free to move axially along their respective support rods, and they are likewise capable of a slight movement in a transverse direction toward the enlarged portions of their associated shafts 3 and 7.
  • teeth are necessary to prevent the material being shredded from jamming or being wound around one or the other roll during the shredding process.
  • the use of such combs for this purpose is not novel. but heretofore the teeth have been made of a relatively rigid or stiff material and have been rigidly supported so that if material in excess of the capacity of the device is inserted between the rolls such teeth have been known to break.
  • the teeth of the present invention are preferably formed ofa resilient material such as a suitable plastic, and this fact in combination with the loose mounting of the teeth on their respective support rods enables a freedom of movement of the individual teeth not heretofore possible, and enables a greater capacity while at the same time properly functioning to prevent jamming.
  • the basic concept of the present invention is capable of assuming alternative forms.
  • the basic concept is the provision of at least one circumferential edge of each disc on at least one roll with a radius. It is desirable to have the face of the disc which terminates at its circumferential edge in a radius adjacent the face of a disc on the other roll the face of which terminates in a circumferential edge which is not radius.
  • FIG. 4 shows an alternative form of the invention.
  • the shaft 7 having the enlarged portion 8 thereon is provided with the same discs 9 with spaces 10 therebetween and the one circumferential edge 14 thereof having a radius.
  • the discs 5a on the other roll do not have any circumferential edge with a radius.
  • Such edges 24 and 25 will be relatively sharp, but even in this case it will be noted that the faces 14a of the discs 9 which terminate in the circumferential edges 14 having a radius will be positioned adjacent the faces of the discs on the other roll which terminate in circumferential edges which are sharp or at least do not have a radius.
  • one of the rolls such as the roll 1 may still have the discs 5a, neither edge of which has a radius, but with the other roll having discs thereon wherein both of the circumferential edges 14b and MC both have a radius.
  • a further advantage, which results from the construction hereinabove described, wherein at least one of the circumferential edges of the discs on at least one of the rolls has a radius is to facilitate the assembly of the combs on that particular roll.
  • the comb teeth are rigidly mounted in a predetermined spaced apart relation this fact is of little consequence, but where such teeth are loosely mounted on their support rods the rounding of the circumferential edges as aforesaid materially aids in aligning the teeth with their respective spaces and in inserting the teeth therein.
  • a device for shredding paper and like material comprising:
  • a device for shredding paper and like material comprising:
  • each disc on each said roll having a radius which is a maximum of .010 inches and being positioned adjacent the face of a disc on the other roll, the circumferential edge of which is sharp.
  • a device for shredding paper and like material comprising:

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Unwinding Webs (AREA)
US00251800A 1972-05-09 1972-05-09 Paper shredder Expired - Lifetime US3797765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25180072A 1972-05-09 1972-05-09

Publications (1)

Publication Number Publication Date
US3797765A true US3797765A (en) 1974-03-19

Family

ID=22953468

Family Applications (1)

Application Number Title Priority Date Filing Date
US00251800A Expired - Lifetime US3797765A (en) 1972-05-09 1972-05-09 Paper shredder

Country Status (4)

Country Link
US (1) US3797765A (enExample)
DE (1) DE2238915A1 (enExample)
FR (1) FR2183761B3 (enExample)
GB (1) GB1372894A (enExample)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894697A (en) * 1974-04-19 1975-07-15 Pitney Bowes Inc Paper shredder
US4018392A (en) * 1975-12-22 1977-04-19 Wagner John W Shredding machine
US4364423A (en) * 1980-10-21 1982-12-21 Macmillan Bloedel Limited Rotating disc splitter
US4421149A (en) * 1978-03-13 1983-12-20 Macmillan Bloedel Limited Process for preparation of long wood strands
US4739939A (en) * 1987-04-10 1988-04-26 Blower Application Company Ripper teeth mounting structure
EP0184786A3 (en) * 1984-12-07 1988-07-27 Gao Gesellschaft Fur Automation Und Organisation Mbh Device for destroying bank notes
US4778114A (en) * 1987-04-10 1988-10-18 Blower Application Company Shredding apparatus
US5071080A (en) * 1990-02-27 1991-12-10 Fellowes Manufacturing Company Document shredding machine
US5096499A (en) * 1991-01-04 1992-03-17 Tilby Sydney E Slitting apparatus for sugarcane rind
US5232510A (en) * 1991-01-04 1993-08-03 Tilbey Sydney E Slitting apparatus for sugarcane rind
US5236139A (en) * 1992-08-10 1993-08-17 Ameri-Shred Industrial Corp. Wear adjustable shredder
WO1993016803A1 (en) * 1992-02-21 1993-09-02 Tilby Sydney E Improved slitting apparatus for sugarcane rind
US5295633A (en) * 1992-01-13 1994-03-22 Fellowes Manufacturing Company Document shredding machine with stripper and cutting mechanism therefore
US5636801A (en) * 1995-08-02 1997-06-10 Fellowes Mfg. Co. One piece molded stripper for shredders
US5655725A (en) * 1995-08-24 1997-08-12 Fellowes Manufacturing Co. Retaining plate for gearing
US5676321A (en) * 1995-04-03 1997-10-14 Fellowes Mfg. Co. Cutting disk
US5826809A (en) * 1997-04-30 1998-10-27 Fellowes Manufacturing Company Support for cutting cylinders in a paper shredder
US5829697A (en) * 1995-08-24 1998-11-03 Fellowes Manufacturing Company Support for cylinders in a paper shredder
USD412716S (en) 1998-06-30 1999-08-10 Fellowes Manufacturing Company Paper shredder
US5954280A (en) * 1998-05-12 1999-09-21 Fellowes Manufacturing Company Top blocker for a paper shredder
US5961059A (en) * 1997-04-30 1999-10-05 Fellowes Manufacturing Company Support for drive system in a paper shredder
RU2214331C1 (ru) * 2002-04-16 2003-10-20 Фролов Александр Григорьевич Устройство для измельчения отходов
US20080064457A1 (en) * 2006-09-11 2008-03-13 Lamont John S Straw Chopper
WO2011133865A1 (en) * 2010-04-22 2011-10-27 Forest Concepts, LLC Engineered plant biomass feedstock particles
CN103157537A (zh) * 2011-12-15 2013-06-19 沈锦海 破碎机的浮式梳片装置
US8481160B2 (en) 2010-04-22 2013-07-09 Forest Concepts, LLC Bimodal and multimodal plant biomass particle mixtures
US8497019B2 (en) 2010-04-22 2013-07-30 Forest Concepts, LLC Engineered plant biomass particles coated with bioactive agents
US8497020B2 (en) 2010-04-22 2013-07-30 Forest Concepts, LLC Precision wood particle feedstocks
US8496033B2 (en) 2010-04-22 2013-07-30 Forest Concepts, LLC Comminution process to produce engineered wood particles of uniform size and shape with disrupted grain structure from veneer
US8507093B2 (en) 2010-04-22 2013-08-13 Forest Concepts, LLC Comminution process to produce precision wood particles of uniform size and shape with disrupted grain structure from wood chips
US8734947B2 (en) 2010-04-22 2014-05-27 Forst Concepts, LLC Multipass comminution process to produce precision wood particles of uniform size and shape with disrupted grain structure from wood chips
US8758895B2 (en) 2010-04-22 2014-06-24 Forest Concepts, LLC Engineered plant biomass particles coated with biological agents
US20140299685A1 (en) * 2010-04-22 2014-10-09 Forest Concepts, LLC Multipass rotary shear comminution process to produce corn stover particles
US8871346B2 (en) 2010-04-22 2014-10-28 Forest Concepts, LLC Precision wood particle feedstocks with retained moisture contents of greater than 30% dry basis
US9061286B2 (en) 2010-04-22 2015-06-23 Forest Concepts, LLC Comminution process to produce precision wood particles of uniform size and shape with disrupted grain structure from wood chips
US9440237B2 (en) 2010-04-22 2016-09-13 Forest Concepts, LLC Corn stover biomass feedstocks with uniform particle size distribution profiles at retained field moisture contents
EP3542648B1 (de) 2018-03-22 2023-02-22 Körber Technologies GmbH Vorrichtung und verfahren zum herstellen eines strangs aus bahnmaterial

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104325697B (zh) * 2014-10-25 2017-09-15 蚌埠富源电子科技有限责任公司 一种纸箱成型机的剔纸装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1551875A (en) * 1923-04-18 1925-09-01 Hall Pirl Ward Mill for grinding rubber material
US2036207A (en) * 1933-07-11 1936-04-07 Globe Ticket Co Destroyer for tickets
US2547234A (en) * 1948-07-16 1951-04-03 Cube Steak Machine Co Meat tenderizing machine
US3062460A (en) * 1961-04-10 1962-11-06 Leroy R Bunney Bamboo chipper
US3222712A (en) * 1964-01-23 1965-12-14 Sir Steak Machinery Inc Meat tenderizing machine
US3396914A (en) * 1966-03-15 1968-08-13 Centriblast Corp Machine for disintegrating paper and other waste materials
US3630460A (en) * 1968-11-09 1971-12-28 Albert Goldhammer Paper shredder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1551875A (en) * 1923-04-18 1925-09-01 Hall Pirl Ward Mill for grinding rubber material
US2036207A (en) * 1933-07-11 1936-04-07 Globe Ticket Co Destroyer for tickets
US2547234A (en) * 1948-07-16 1951-04-03 Cube Steak Machine Co Meat tenderizing machine
US3062460A (en) * 1961-04-10 1962-11-06 Leroy R Bunney Bamboo chipper
US3222712A (en) * 1964-01-23 1965-12-14 Sir Steak Machinery Inc Meat tenderizing machine
US3396914A (en) * 1966-03-15 1968-08-13 Centriblast Corp Machine for disintegrating paper and other waste materials
US3630460A (en) * 1968-11-09 1971-12-28 Albert Goldhammer Paper shredder

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894697A (en) * 1974-04-19 1975-07-15 Pitney Bowes Inc Paper shredder
US4018392A (en) * 1975-12-22 1977-04-19 Wagner John W Shredding machine
US4421149A (en) * 1978-03-13 1983-12-20 Macmillan Bloedel Limited Process for preparation of long wood strands
US4364423A (en) * 1980-10-21 1982-12-21 Macmillan Bloedel Limited Rotating disc splitter
EP0184786A3 (en) * 1984-12-07 1988-07-27 Gao Gesellschaft Fur Automation Und Organisation Mbh Device for destroying bank notes
US4739939A (en) * 1987-04-10 1988-04-26 Blower Application Company Ripper teeth mounting structure
US4778114A (en) * 1987-04-10 1988-10-18 Blower Application Company Shredding apparatus
US5071080A (en) * 1990-02-27 1991-12-10 Fellowes Manufacturing Company Document shredding machine
US5096499A (en) * 1991-01-04 1992-03-17 Tilby Sydney E Slitting apparatus for sugarcane rind
US5232510A (en) * 1991-01-04 1993-08-03 Tilbey Sydney E Slitting apparatus for sugarcane rind
US5295633A (en) * 1992-01-13 1994-03-22 Fellowes Manufacturing Company Document shredding machine with stripper and cutting mechanism therefore
WO1993016803A1 (en) * 1992-02-21 1993-09-02 Tilby Sydney E Improved slitting apparatus for sugarcane rind
US5236139A (en) * 1992-08-10 1993-08-17 Ameri-Shred Industrial Corp. Wear adjustable shredder
US5676321A (en) * 1995-04-03 1997-10-14 Fellowes Mfg. Co. Cutting disk
US5636801A (en) * 1995-08-02 1997-06-10 Fellowes Mfg. Co. One piece molded stripper for shredders
US5655725A (en) * 1995-08-24 1997-08-12 Fellowes Manufacturing Co. Retaining plate for gearing
US5829697A (en) * 1995-08-24 1998-11-03 Fellowes Manufacturing Company Support for cylinders in a paper shredder
US5961059A (en) * 1997-04-30 1999-10-05 Fellowes Manufacturing Company Support for drive system in a paper shredder
US5826809A (en) * 1997-04-30 1998-10-27 Fellowes Manufacturing Company Support for cutting cylinders in a paper shredder
US5954280A (en) * 1998-05-12 1999-09-21 Fellowes Manufacturing Company Top blocker for a paper shredder
USD412716S (en) 1998-06-30 1999-08-10 Fellowes Manufacturing Company Paper shredder
RU2214331C1 (ru) * 2002-04-16 2003-10-20 Фролов Александр Григорьевич Устройство для измельчения отходов
US20080064457A1 (en) * 2006-09-11 2008-03-13 Lamont John S Straw Chopper
US7740198B2 (en) * 2006-09-11 2010-06-22 Lamont John S Straw chopper
US8496033B2 (en) 2010-04-22 2013-07-30 Forest Concepts, LLC Comminution process to produce engineered wood particles of uniform size and shape with disrupted grain structure from veneer
US8758895B2 (en) 2010-04-22 2014-06-24 Forest Concepts, LLC Engineered plant biomass particles coated with biological agents
US10105867B2 (en) 2010-04-22 2018-10-23 Forest Concepts, LLC Comminution process to produce engineered wood particles of uniform size and shape from cross-grain oriented wood chips
US8481160B2 (en) 2010-04-22 2013-07-09 Forest Concepts, LLC Bimodal and multimodal plant biomass particle mixtures
US8497019B2 (en) 2010-04-22 2013-07-30 Forest Concepts, LLC Engineered plant biomass particles coated with bioactive agents
US8497020B2 (en) 2010-04-22 2013-07-30 Forest Concepts, LLC Precision wood particle feedstocks
WO2011133865A1 (en) * 2010-04-22 2011-10-27 Forest Concepts, LLC Engineered plant biomass feedstock particles
US8507093B2 (en) 2010-04-22 2013-08-13 Forest Concepts, LLC Comminution process to produce precision wood particles of uniform size and shape with disrupted grain structure from wood chips
US8734947B2 (en) 2010-04-22 2014-05-27 Forst Concepts, LLC Multipass comminution process to produce precision wood particles of uniform size and shape with disrupted grain structure from wood chips
US8158256B2 (en) 2010-04-22 2012-04-17 Forest Concepts, LLC Engineered plant biomass feedstock particles
US20140299685A1 (en) * 2010-04-22 2014-10-09 Forest Concepts, LLC Multipass rotary shear comminution process to produce corn stover particles
US8871346B2 (en) 2010-04-22 2014-10-28 Forest Concepts, LLC Precision wood particle feedstocks with retained moisture contents of greater than 30% dry basis
US9005758B2 (en) * 2010-04-22 2015-04-14 Forest Concepts, LLC Multipass rotary shear comminution process to produce corn stover particles
US9061286B2 (en) 2010-04-22 2015-06-23 Forest Concepts, LLC Comminution process to produce precision wood particles of uniform size and shape with disrupted grain structure from wood chips
US9440237B2 (en) 2010-04-22 2016-09-13 Forest Concepts, LLC Corn stover biomass feedstocks with uniform particle size distribution profiles at retained field moisture contents
US9604387B2 (en) 2010-04-22 2017-03-28 Forest Concepts, LLC Comminution process to produce wood particles of uniform size and shape with disrupted grain structure from veneer
CN103157537A (zh) * 2011-12-15 2013-06-19 沈锦海 破碎机的浮式梳片装置
EP3542648B1 (de) 2018-03-22 2023-02-22 Körber Technologies GmbH Vorrichtung und verfahren zum herstellen eines strangs aus bahnmaterial

Also Published As

Publication number Publication date
DE2238915A1 (de) 1973-11-29
FR2183761B3 (enExample) 1976-04-16
FR2183761A1 (enExample) 1973-12-21
GB1372894A (en) 1974-11-06

Similar Documents

Publication Publication Date Title
US3797765A (en) Paper shredder
US3860180A (en) Method and apparatus for destroying documents
US3630460A (en) Paper shredder
US5163629A (en) Shredder cutting discs
US4944462A (en) Shredder
US4260115A (en) Document shredder
US4194698A (en) Shredder
ITMI940444A1 (it) Apparecchio sminuzzatore a rulli rotanti dotato di lamiere non forate ad arco coassiali ai rulli
US3033064A (en) Support and stripper for cutter head in a paper shredding machine
US3921920A (en) Machine for destroying documents
US3894697A (en) Paper shredder
US3333752A (en) Apparatus for destroying documents
US1980193A (en) Chip cutter
US4235382A (en) Method and apparatus for rechipping wood chips
US1673336A (en) Machine for shredding materials
GB2201905A (en) Stripping means for shredding machines or the like
DE1507485A1 (de) Vorrichtung zur Zerkleinerung von Materialien verschiedener Art
US3730363A (en) Cutting head for comminuting machines
US4184619A (en) Cutting device
US2182219A (en) Paper shredder
JP3025879B2 (ja) 熱成形装置におけるスクラップシートの処理機
JPH1034003A (ja) 古紙の処理装置
US20070181721A1 (en) Devices and methods for shredding media into different sizes
SU494481A1 (ru) Устройство дл разрывани полотна целлюлозы
CN216149951U (zh) 陶瓷纤维纸回收用撕碎机的刀具结构