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WO1992010339A1 - Formage de barres de protection pour massicots - Google Patents

Formage de barres de protection pour massicots Download PDF

Info

Publication number
WO1992010339A1
WO1992010339A1 PCT/CH1991/000220 CH9100220W WO9210339A1 WO 1992010339 A1 WO1992010339 A1 WO 1992010339A1 CH 9100220 W CH9100220 W CH 9100220W WO 9210339 A1 WO9210339 A1 WO 9210339A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
strip
protective strip
strip according
protective
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.)
Ceased
Application number
PCT/CH1991/000220
Other languages
German (de)
English (en)
Inventor
Paul BÜNZLI
Wolfgang Mohr
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.)
Polatech GmbH
Original Assignee
Polatech GmbH
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 Polatech GmbH filed Critical Polatech GmbH
Publication of WO1992010339A1 publication Critical patent/WO1992010339A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/20—Cutting beds

Definitions

  • the table was provided with an approximately 10 mm wide and 4.5 mm deep groove, into which a plastic strip was pressed.
  • the strips of the first type were snake-shaped, or more precisely sinus-shaped. When it is pressed into the groove, the snake shape is forced into a straight line, as a result of which pressing forces are exerted on both sides of the groove. The pressing forces clamp the protective strip in the groove.
  • These strips have decisive disadvantages. The strips are wearing parts. They have to be thrown away after four knife changes. Since they were made of PVC, a large amount of environmentally harmful PVC waste was generated.
  • the protective strips of the second type consisted practically only of a thin film, which was provided in the middle with a tube-like structure. So that this protective strip could be inserted into the groove of existing paper cutting machines, a metal strip was glued into the existing groove. This metal strip had a groove or depression in the middle which was shaped in such a way that the protective strip could be pressed in with the hose-like attachment. Due to the special shape of the groove, a snap effect was achieved, which allowed the protective strip to be inserted and removed easily. E ⁇ were also other Shape shapes that could achieve a certain snap effect are possible. The material used was no longer PVC, but a plastic not impact-resistant, such as polypropylene or high-molecular polyethylene.
  • the object of the invention is to create a protective strip which has such a shape that it can be easily produced from polypropylene or a similar material by means of an extruder.
  • the object is achieved according to the invention with the aid of the training features according to the characterizing part of patent claim 1.
  • FIG. 2 top view of the protective strip.
  • FIG. 3 side view of the protective strip
  • the cross section of the new protective strip corresponds approximately to a rectangle with a height of 4.45 mm and a width of 9.93 mm.
  • a hollow 2 runs in each case along the two narrow side surfaces 1 in the interior of the protective strip.
  • the cross section of the hollow 2 can be seen in FIG. 1.
  • the two narrow side surfaces 1 are not flat.
  • Two beads 3 each with a circular segment cross section run along the side faces 1.
  • the beads 3 are arranged symmetrically to the bisector 4 of the narrow sides 1. Including the bead height, the width of the protective strip is a few tenths of a millimeter more than 10 mm and is thus somewhat wider than the groove.
  • the narrow side walls 1 can be pressed inwards thanks to the longitudinal cavities 2, without the thickness of the strip changing in the process. Thanks to the elasticity of the polypropylene from which the protective strip is made, the pressed-in side walls 1 exert a counter pressure on the groove walls via the longitudinal beads 2, which clamps the protective strip in the groove.
  • the height of the protective strip is a few tenths of a millimeter less than the height of the groove. It is thereby achieved that the protective strip does not protrude beyond the working surface even in the case of changes in dimensions due to temperature fluctuations and changes in the relative humidity values. The dimensional changes due to changing temperature and humidity have been taken into account in the shaping, since polypropylene has substantially higher expansion coefficients than the metals from which the work tables are made.
  • the strip can be better manufactured using an extruder made of polypropylene or a similar material.
  • the polypropylene means that it is not necessary to offer several protective strips with different hardness.
  • a protective strip with a coordinated Shore hardness is sufficient for all known knife types.
  • the polypropylene waste can be disposed of in an environmentally friendly manner. In the production of the new protective strips, no additional post-processing is necessary.
  • the protective strip is only extruded. This ensures a high surface quality. The surface is no longer contaminated by hard abrasive stone particles that could damage the knife.
  • the new protective strip can be pressed directly into the existing groove without an additional metal strip having to be glued into the groove beforehand.
  • the new protective strip holds well in the groove, since the clamping pressure acts on the entire length of the protective strip and not only at individual points, as was the case with the snake-shaped PVC protective strips of the first type .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Buffer Packaging (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Une barre en matière plastique empêche la lame d'un massicot de toucher le dessus de la table de travail et protège donc celui-ci contre des endommagements. La nouveauté de l'invention réside dans la forme spéciale de la barre, qui permet de fabriquer celle-ci par extrusion à partir de polypropylène ou d'un matériau similaire, sans façonnages ultérieurs. La barre est comprimée dans la rainure existant dans les dessus de tables de travail usuelles et a approximativement la même section transversale rectangulaire que la rainure. Deux bourrelets longitudinaux (3) s'étendant sur les deux surfaces latérales étroites (1) de la barre rendent celle-ci légèrement plus large que la rainure, ce qui fait qu'elle est latéralement serrée lorsqu'elle est comprimée dans la rainure, sans que son épaisseur se modifie. La déformabilité requise est assurée grâce à deux cavités (2) ménagées dans la barre le long de ses faces latérales étroites (1).
PCT/CH1991/000220 1990-12-05 1991-10-24 Formage de barres de protection pour massicots Ceased WO1992010339A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3849/90-7 1990-12-05
CH384990A CH683161A5 (de) 1990-12-05 1990-12-05 Schutzleiste für Papierschneidmaschinen.

Publications (1)

Publication Number Publication Date
WO1992010339A1 true WO1992010339A1 (fr) 1992-06-25

Family

ID=4264800

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1991/000220 Ceased WO1992010339A1 (fr) 1990-12-05 1991-10-24 Formage de barres de protection pour massicots

Country Status (3)

Country Link
EP (1) EP0513255A1 (fr)
CH (1) CH683161A5 (fr)
WO (1) WO1992010339A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2151928A1 (de) * 1970-10-23 1972-04-27 Polygraph Leipzig Vorrichtung zum Querschneiden von Papier oder dergleichen Bahnen
EP0108356A1 (fr) * 1982-11-08 1984-05-16 Baldwin Technology Corporation Dispositif pour couper le papier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2151928A1 (de) * 1970-10-23 1972-04-27 Polygraph Leipzig Vorrichtung zum Querschneiden von Papier oder dergleichen Bahnen
EP0108356A1 (fr) * 1982-11-08 1984-05-16 Baldwin Technology Corporation Dispositif pour couper le papier

Also Published As

Publication number Publication date
EP0513255A1 (fr) 1992-11-19
CH683161A5 (de) 1994-01-31

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