EP1040016B1 - Pencil sharpener - Google Patents

Pencil sharpener Download PDF

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Publication number
EP1040016B1
EP1040016B1 EP98964450A EP98964450A EP1040016B1 EP 1040016 B1 EP1040016 B1 EP 1040016B1 EP 98964450 A EP98964450 A EP 98964450A EP 98964450 A EP98964450 A EP 98964450A EP 1040016 B1 EP1040016 B1 EP 1040016B1
Authority
EP
European Patent Office
Prior art keywords
chuck
clamping
retaining
tongues
housing
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
EP98964450A
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German (de)
French (fr)
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EP1040016A1 (en
Inventor
Thomas Schultheiss
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.)
Wilhelm Dahle Buero-Technik & Co KG GmbH
Original Assignee
Wilhelm Dahle Buero-Technik & Co KG GmbH
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Publication of EP1040016A1 publication Critical patent/EP1040016A1/en
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Publication of EP1040016B1 publication Critical patent/EP1040016B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00Sharpeners for pencils or leads
    • B43L23/02Sharpeners for pencils or leads with gearing
    • B43L23/04Sharpeners for pencils or leads with gearing with cranked handles

Definitions

  • the invention relates to a pencil sharpener with the features of the preamble of Claim 1. If here from a "pin" than from the chuck of the pointed machine too exciting workpiece, not only pencils or crayons, but also kohl pencils, mines or similar pen-shaped objects.
  • Pen sharpeners hold the pen in the chuck while the milling cutter in the area around the pen tip driven around it.
  • the rotary drive is done by motor or by hand.
  • the chuck is within an in Axial direction of the chuck housing on which the milling mechanism containing machine housing slidably guided in the axial direction.
  • the Chuck housing is against the spring tension in the axial direction Milling cutter acted in such a way that an automatic axial infeed of the pen tip against the rotating plane of the rotating milling cutters takes place.
  • the chuck of the known pointed machines is designed in many parts and therefore technically complex.
  • the retaining tongues are individually around axes that are fixed to the housing pivoted on the chuck housing. Your outer actuating ends are drive-wise with a separate, surrounding the chuck axis like a ring Holding frame connected, which is effective against one in its circumferential direction Torsion spring swiveling around the chuck axis within the chuck housing is stored. By swiveling the holding frame against the pressure of the torsion spring the holding ends of the holding tongues open the chuck and the pin is simple removable.
  • the torsion spring loading of the holding frame in the circumferential direction causes the holding ends of the holding tongues to pivot back automatically into their Clamping position in relation to an inserted pin or in a near-axis Closed position.
  • a similar chuck for a pencil sharpener is from DE-AS 1 063 934 known. Instead of a torsion spring, however, there are several in the circumferential direction extending coil springs are provided to act on the holding frame.
  • DE-PS 472 725 a further chuck for a pencil sharpening machine is known.
  • the chuck is formed by several levers that are fixed to the housing Axles are pivotally mounted and approximately tangential to an implementation for the pen are guided. In the area of the bushing, each lever carries a clamping jaw, which protrudes into the bushing when the chuck is in the closed position.
  • the levers reach with their outer ends into sections of a pivotable Chuck cover so that when turning the cover by spring force jaws held together are pulled apart approximately radially.
  • these known chucks are disadvantageously formed in many parts and thereby complex manufacturing technology.
  • the invention has for its object a pointed machine of the aforementioned Kind of simplify construction. This object is solved by claim 1. What about State of the art through a multi-part training with a rotary or Sliding mobility of these parts against each other is achieved Invention with only the holding frame and neither rotatable nor slidably fixed holding tongues. A separate, effective in the circumferential direction Torsion spring is not required because its effectiveness is replaced by the one specified in Art rod springs clamped on one side on the holding frame and their holding tongues Attachment to fixed stops of the chuck housing.
  • the use of polyoxymethylene (POM) as Material for the one-piece chuck according to claim 3 grants a long-term retention of the elasticity of the retaining tongues.
  • An arrangement according to claim 4 enables a particularly simple assembly of the Chuck, as this is not - as usual - under tension in the Chuck housing must be introduced.
  • Claim 8 allows a great design freedom for the holding frame, without the Freedom of shape, the spring behavior and the pivoting mobility of the To influence holding tongues. This is particularly advantageous because the retaining tabs on Holding frame fixed and in particular are made in one piece with it.
  • the spring characteristic of a retaining tongue can be easily according to claim 9 by the Dimensioning their cross-sectional area in the individual longitudinal areas of the retaining tongue to adjust.
  • claim 10 is an improvement in the grip of the holding ends Retaining tongues ensured.
  • Claim 12 and / or 13 allow a further Simplification of the manufacturing of the pointed machine.
  • chuck 1 and 2 comprises a chuck 1, which in a part designed as a trough-shaped outer shell 2
  • Chuck housing 2,3 is mounted about a chuck axis 4.
  • the chuck 1 and for clarity the outer shell 2 are individually in FIGS. 3 and 5 and in FIG Fig. 6 shown.
  • an inner shell 3, not shown in Fig. 1, the Chuck housing 2.3 completed approximately in the drawing plane.
  • the terms radial and axially are used in relation to the chuck axis 4.
  • the chuck 1 is supported on the inner wall 5 of the outer shell 2 attached axial projections 6, which in the peripheral region of a substantially Disc-shaped holding frame 7 of the chuck 1 rest. Transferred to the Contact surfaces of the axial projections 6 are in the peripheral region of the holding frame 7 this approximately rod-shaped retaining tongues 8 rectangular cross-section formed.
  • their Cross-sectional height i.e. its expansion in the axial direction tapers Retaining tongue 8 wedge-like, as can be seen from Fig. 6b.
  • the circumferentially Widened, radially inner holding ends 10 of the holding tongues 8 are in FIG. 1 shown - idle state of the chuck 1 closely spaced from each other. to The radially inward-facing surfaces of the Retaining tongues 8 are provided with retaining grooves 11.
  • the holding frame 7 is mounted by means of the axial projections 6 such that it is in one limited angular interval about the chuck axis 4 is pivotable.
  • the opening lever 13 is at the Outer shell 2 externally attached projection as counter support 14 in Swing direction with a distance opposite.
  • each retaining tongue 8 lies relaxed on one of the inner wall 5 of the Outer shell 2 protruding stop 15.
  • the stop 15 is positioned in such a way that he has the holding tongue 8 near the holding end 10 at the pivoting direction touching surface.
  • a pin to be sharpened can now be inserted both in the chuck housing 2, 3 and bushing 16 provided in the holding frame 7 is inserted into the chuck 1 become.
  • the chuck 1 pivots, driven by the restoring force of the curved retaining tongues 8, automatically in Back towards its closed position.
  • the inserted pin is removed from the striving holding ends 10 coaxial to the chuck axis 4 fixed and rotatable clamped with respect to the chuck 1.
  • the assembly process takes place, as indicated in FIG. 6: First, the chuck 1 inserted into the outer shell 2 along the dashed lines and according to FIG. 1. Then it is closed by the inner shell 3.
  • the inner shell 3 is in accordance with Fig. 7 designed substantially flat and carries a network of on its inner wall 17 Stiffening ribs 18.
  • the connection between the outer 2 and inner shell 3 is thereby produced via a snap connection 19 designed in a conventional manner.
  • the chuck housing 2, 3 is connected to an unillustrated, the machine housing containing the milling mechanism is guided axially displaceably.
  • This Axial guide 20 is integrally formed on the outer wall 21 of the inner shell 3.

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  • Drawing Aids And Blackboards (AREA)
  • Jigs For Machine Tools (AREA)
  • Clamps And Clips (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft eine Stiftspitzmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1. Wenn hier von einem "Stift" als vom Spannfutter der Spitzmaschine zu spannendem Werkstück die Rede ist, so sind darunter nicht nur Blei- oder Buntstifte, sondern auch Kajalstifte, Minen oder ähnliche stiftförmige Gegenstände gemeint.The invention relates to a pencil sharpener with the features of the preamble of Claim 1. If here from a "pin" than from the chuck of the pointed machine too exciting workpiece, not only pencils or crayons, but also kohl pencils, mines or similar pen-shaped objects.

Bei aus der DE-OS 2 015 683 sowie aus der US-PS 3,227,140 bekannten derartigen Stiftspitzmaschinen wird der Stift drehfest im Spannfutter gehalten, während die Fräser im Bereich der Stiftspitze um diese herum angetrieben umlaufen. Der Umlaufantrieb erfolgt motorisch oder auch von Hand. Das Spannfutter ist dabei innerhalb eines in Axialrichtung verschiebbaren Spannfuttergehäuses an dem die Fräsermechanik enthaltenden Maschinengehäuse in Axialrichtung verschiebbar geführt. Das Spannfuttergehäuse wird dabei durch eine Federspannung in Axialrichtung gegen die Fräser derart beaufschlagt, daß eine selbsttätige axiale Zustellung der Stiftspitze gegen die Rotationsebene der umlaufenden Fräser erfolgt.In such known from DE-OS 2 015 683 and from US-PS 3,227,140 Pen sharpeners hold the pen in the chuck while the milling cutter in the area around the pen tip driven around it. The rotary drive is done by motor or by hand. The chuck is within an in Axial direction of the chuck housing on which the milling mechanism containing machine housing slidably guided in the axial direction. The Chuck housing is against the spring tension in the axial direction Milling cutter acted in such a way that an automatic axial infeed of the pen tip against the rotating plane of the rotating milling cutters takes place.

Das Spannfutter der bekannten Spitzmaschinen ist vielteilig ausgebildet und dadurch fertigungstechnisch aufwendig. Die Haltezungen sind einzeln um gehäusefeste Achsen am Spannfuttergehäuse schwenkbar gelagert. Ihre äußeren Betätigungsenden sind antriebsmäßig mit einem gesonderten, die Spannfutterachse ringartig umgebenden Halterahmen verbunden, welcher gegen eine in dessen Umfangsrichtung wirksame Drehfeder um die Spannfutterachse schwenkbar innerhalb des Spannfuttergehäuses gelagert ist. Durch Schwenkung des Halterahmens gegen den Druck der Drehfeder öffnen die Halteenden der Haltezungen das Spannfutter und der Stift ist einfach entnehmbar. Die Drehfederbeaufschlagung des Halterahmens in Umfangsrichtung bewirkt eine selbsttätige Rückschwenkung der Halteenden der Haltezungen in ihre Klemmstellung gegenüber einem einliegenden Stift oder in eine achsnahe Schließstellung. The chuck of the known pointed machines is designed in many parts and therefore technically complex. The retaining tongues are individually around axes that are fixed to the housing pivoted on the chuck housing. Your outer actuating ends are drive-wise with a separate, surrounding the chuck axis like a ring Holding frame connected, which is effective against one in its circumferential direction Torsion spring swiveling around the chuck axis within the chuck housing is stored. By swiveling the holding frame against the pressure of the torsion spring the holding ends of the holding tongues open the chuck and the pin is simple removable. The torsion spring loading of the holding frame in the circumferential direction causes the holding ends of the holding tongues to pivot back automatically into their Clamping position in relation to an inserted pin or in a near-axis Closed position.

Ein ähnliches Spannfutter für eine Stiftspitzmaschine ist aus der DE-AS 1 063 934 bekannt. Anstelle einer Drehfeder sind hierbei jedoch mehrere in Umfangsrichtung verlaufende Schraubenfedern zur Beaufschlagung des Halterahmens vorgesehen. Aus der DE-PS 472 725 ist ein weiteres Spannfutter für eine Stiftspitzmaschine bekannt. Das Spannfutter wird hierbei durch mehrere Hebel gebildet, die um gehäusefeste Achsen schwenkbar gelagert sind und die etwa tangential zu einer Durchführung für den Stift geführt sind. Im Bereich der Durchführung trägt jeder Hebel eine Spannbacke, die in Schließstellung des Spannfutters in die Durchführung hineinragt. Die Hebel greifen dabei mit ihren äußeren Enden in Ausschnitte eines verschwenkbaren Spannfutterdeckels ein, so daß beim Drehen des Deckels die durch Federkraft zusammen gehaltenen Spannbacken etwa radial auseinander gezogen werden. Auch diese bekannten Spannfutter sind in nachteiliger Weise vielteilig ausgebildet und dadurch fertigungstechnisch aufwendig.A similar chuck for a pencil sharpener is from DE-AS 1 063 934 known. Instead of a torsion spring, however, there are several in the circumferential direction extending coil springs are provided to act on the holding frame. Out DE-PS 472 725 a further chuck for a pencil sharpening machine is known. The chuck is formed by several levers that are fixed to the housing Axles are pivotally mounted and approximately tangential to an implementation for the pen are guided. In the area of the bushing, each lever carries a clamping jaw, which protrudes into the bushing when the chuck is in the closed position. The levers reach with their outer ends into sections of a pivotable Chuck cover so that when turning the cover by spring force jaws held together are pulled apart approximately radially. Also these known chucks are disadvantageously formed in many parts and thereby complex manufacturing technology.

Der Erfindung liegt die Aufgabe zugrunde, eine Spitzmaschine der eingangs genannten Art baulich zu vereinfachen. Diese Aufgabe wird durch Anspruch 1 gelöst. Was beim Stand der Technik durch eine vielteilige Ausbildung mit einer Dreh- oder Schiebebeweglichkeit dieser Teile gegeneinander erreicht wird, bewerkstelligt die Erfindung mit lediglich dem Halterahmen und den daran weder drehbar noch verschiebbar fixierten Haltezungen. Einer gesonderten, in Umfangsrichtung wirksamen Drehfeder bedarf es nicht, weil deren Wirksamkeit ersetzt wird durch die nach Art einseitig eingespannter Stabfedern am Halterahmen fixierten Haltezungen und deren Anlage an ortsfesten Anschlägen des Spannfuttergehäuses.The invention has for its object a pointed machine of the aforementioned Kind of simplify construction. This object is solved by claim 1. What about State of the art through a multi-part training with a rotary or Sliding mobility of these parts against each other is achieved Invention with only the holding frame and neither rotatable nor slidably fixed holding tongues. A separate, effective in the circumferential direction Torsion spring is not required because its effectiveness is replaced by the one specified in Art rod springs clamped on one side on the holding frame and their holding tongues Attachment to fixed stops of the chuck housing.

Besonders vorteilhaft ist eine einstückige Ausbildung von Halterahmen und Haltezungen nach Anspruch 2. Die Verwendung von Polyoxymethylen (POM) als Material für das einstückig ausgebildete Spannfutter gemäß Anspruch 3 gewährt eine langfristig erhalten bleibende Elastizität der Haltezungen. A one-piece design of the holding frame and Retaining tongues according to claim 2. The use of polyoxymethylene (POM) as Material for the one-piece chuck according to claim 3 grants a long-term retention of the elasticity of the retaining tongues.

Eine Anordnung gemäß Anspruch 4 ermöglicht eine besonders einfache Montage des Spannfutters, da dieses nicht - wie herkömmlich - unter Vorspannung in das Spannfuttergehäuse eingebracht werden muß.An arrangement according to claim 4 enables a particularly simple assembly of the Chuck, as this is not - as usual - under tension in the Chuck housing must be introduced.

Mit den Ansprüchen 6 bzw. 7 wird eine einfache, einhändige Handhabung des Spannfutters erzielt.With claims 6 and 7, a simple, one-handed handling of the Chuck achieved.

Anspruch 8 ermöglicht für den Halterahmen eine große Gestaltungsfreiheit, ohne die Formgebungsfreiheit, das Federverhalten und die Schwenkbeweglichkeit der Haltezungen zu beeinflussen. Das ist besonders vorteilhaft, weil die Haltezungen am Halterahmen fixiert und insbesondere mit ihm einstückig hergestellt sind.Claim 8 allows a great design freedom for the holding frame, without the Freedom of shape, the spring behavior and the pivoting mobility of the To influence holding tongues. This is particularly advantageous because the retaining tabs on Holding frame fixed and in particular are made in one piece with it.

Die Federcharakteristik einer Haltezunge läßt sich einfach nach Anspruch 9 durch die Bemessung ihrer Querschnittfläche in den einzelnen Längsbereichen der Haltezunge einstellen. Dabei kann insbesondere der Verbindungsbereich zwischen der Haltezunge und dem Halterahmen vor einer hohen, materialschädigenden Torsionsspannung geschützt werden.The spring characteristic of a retaining tongue can be easily according to claim 9 by the Dimensioning their cross-sectional area in the individual longitudinal areas of the retaining tongue to adjust. In particular, the connection area between the retaining tongue and the holding frame against a high, material-damaging torsional stress to be protected.

Durch Anspruch 10 wird eine Verbesserung der Griffigkeit der Halteenden der Haltezungen sichergestellt. Anspruch 12 und/oder 13 ermöglichen eine weitere Fertigungsvereinfachung der Spitzmaschine.By claim 10 is an improvement in the grip of the holding ends Retaining tongues ensured. Claim 12 and / or 13 allow a further Simplification of the manufacturing of the pointed machine.

Ein Ausführungsbeispiel der Erfindung wird anhand der Figuren beschrieben. Es zeigen:

Fig. 1
eine Draufsicht auf die Innenseite der Außenschale des Spannfuttergehäuses mit in Ruhestellung einliegendem Halterahmen,
Fig. 2
eine Draufsicht analog Fig. 1 mit in die Öffnungsstellung des Spannfutters geschwenktem Halterahmen,
Fig. 3
eine Draufsicht analog Fig. 1 auf lediglich den Halterahmen mit seinen einstückig angeformten Haltezungen,
Fig. 4
einen vergrößerten Ausschnitt IV in Fig. 3, der den Ansatzbereich einer Haltezunge am Halterahmen darstellt,
Fig. 5
eine Draufsicht analog Fig. 1 und 2 auf die nackte Innenwand der Außenschale des Spannfuttergehäuses,
Fig. 6
eine Seitenansicht der Einzelteile des Spannfuttergehäuses in Explosionsdarstellung, nämlich
  • a) die Innenschale mit angeformter Axialführung,
  • b) das eigentliche Spannfutter aus Halterahmen und Spannzungen sowie
  • c) die Außenschale,
  • Fig. 7
    die Innenschale des Spannfuttergehäuses
  • a) mit angeformter Axialführung in Seitenansicht gemäß Pfeilrichtung Vlla
  • b) in Draufsicht auf deren Außenfläche gemäß Pfeilrichtung VIIb.
  • c) in Draufsicht auf deren dem Spannfutter zugewandte Innenfläche entsprechend Pfeil VIIc
  • An embodiment of the invention is described with reference to the figures. Show it:
    Fig. 1
    2 shows a plan view of the inside of the outer shell of the chuck housing with the holding frame lying in the rest position
    Fig. 2
    1 with the holding frame pivoted into the open position of the chuck,
    Fig. 3
    1 is a plan view analogous to FIG. 1 of only the holding frame with its holding tongues integrally formed thereon
    Fig. 4
    3 shows an enlarged section IV in FIG. 3, which represents the attachment area of a holding tongue on the holding frame,
    Fig. 5
    1 and 2 on the bare inner wall of the outer shell of the chuck housing,
    Fig. 6
    a side view of the individual parts of the chuck housing in an exploded view, namely
  • a) the inner shell with integrally formed axial guide,
  • b) the actual chuck from the holding frame and clamping tongues as well
  • c) the outer shell,
  • Fig. 7
    the inner shell of the chuck housing
  • a) with molded axial guide in side view according to the direction of arrow Vlla
  • b) in plan view of the outer surface according to the direction of arrow VIIb.
  • c) in plan view of the inner surface facing the chuck according to arrow VIIc
  • Die erfindungsgemäße Spitzmaschine umfaßt gemäß Fig. 1 und 2 ein Spannfutter 1, welches in einem als trogförmige Außenschale 2 ausgebildeten Teil eines Spannfuttergehäuses 2,3 um eine Spannfutterachse 4 gelagert ist. Das Spannfutter 1 und die Außenschale 2 sind zur Verdeutlichung einzeln in Fig. 3 bzw. Fig. 5 sowie in Fig. 6 abgebildet. Durch eine in Fig. 1 nicht dargestellte Innenschale 3 wird das Spannfuttergehäuse 2,3 etwa in der Zeichenebene abgeschlossen. Die Begriffe radial und axial werden jeweils bezogen auf die Spannfutterachse 4 verwendet.1 and 2 comprises a chuck 1, which in a part designed as a trough-shaped outer shell 2 Chuck housing 2,3 is mounted about a chuck axis 4. The chuck 1 and for clarity the outer shell 2 are individually in FIGS. 3 and 5 and in FIG Fig. 6 shown. By an inner shell 3, not shown in Fig. 1, the Chuck housing 2.3 completed approximately in the drawing plane. The terms radial and axially are used in relation to the chuck axis 4.

    Zur Lagerung des Spannfutters 1 dienen an der Innenwand 5 der Außenschale 2 angebrachte Axialvorsprünge 6, die im Umfangsbereich eines im wesentlichen kreisscheibenförmigen Halterahmens 7 des Spannfutters 1 anliegen. Versetzt zu den Anlageflächen der Axialvorsprünge 6 sind im Umfangsbereich des Halterahmens 7 an diesem annähernd stabförmige Haltezungen 8 rechteckigen Querschnitts angeformt. Dabei ist eine Haltezunge 8 mit einem Teil einer Seitenfläche auf eine Stirnfläche 9 des Halterahmens 7 mit geringem Abstand aufgesetzt und ragt davon ausgehend im wesentlichen radial in Richtung auf die Spannfutterachse 4. Bezüglich ihrer Querschnittshöhe, d.h. ihrer Ausdehnung in Axialrichtung verjüngt sich die Haltezunge 8 keilartig, wie aus Fig. 6b zu ersehen ist. Die in Umfangsrichtung verbreiterten, radial inneren Halteenden 10 der Haltezungen 8 sind im - in Fig. 1 dargestellten - Ruhezustand des Spannfutters 1 einander dicht beabstandet. Zur Erhöhung der Griffigkeit sind die radial nach innen weisenden Flächen der Haltezungen 8 mit Halterillen 11 versehen.The chuck 1 is supported on the inner wall 5 of the outer shell 2 attached axial projections 6, which in the peripheral region of a substantially Disc-shaped holding frame 7 of the chuck 1 rest. Transferred to the Contact surfaces of the axial projections 6 are in the peripheral region of the holding frame 7 this approximately rod-shaped retaining tongues 8 rectangular cross-section formed. Here, a retaining tongue 8 with part of a side surface on an end surface 9 of the Holding frame 7 placed at a short distance and protrudes therefrom in essentially radially in the direction of the chuck axis 4. Regarding their Cross-sectional height, i.e. its expansion in the axial direction tapers Retaining tongue 8 wedge-like, as can be seen from Fig. 6b. The circumferentially Widened, radially inner holding ends 10 of the holding tongues 8 are in FIG. 1 shown - idle state of the chuck 1 closely spaced from each other. to The radially inward-facing surfaces of the Retaining tongues 8 are provided with retaining grooves 11.

    Der Halterahmen 7 ist mittels der Axialvorsprünge 6 derart gelagert, daß er in einem begrenzten Winkelintervall um die Spannfutterachse 4 verschwenkbar ist. Die Extremstellungen des Halterahmens 7, die der Schließ- und der Offenstellung des Spannfutters 1 entsprechen, sind in Fig. 1 bzw. 2 dargestellt. Zur öffnenden Betätigung des Spannfutters 1 und der damit verbundenen Verschwenkung des Halterahmens 7 ist an diesem ein durch einen Schlitz 12 im Spannfuttergehäuse 2,3 ragender Öffnungshebel 13 angebracht. Die Länge des Schlitzes 12 begrenzt dabei den maximalen Schwenkweg des Halterahmens 7. Dem Öffnungshebel 13 steht ein an der Außenschale 2 außenseitig angebrachter Vorsprung als Gegenhalt 14 in Schwenkrichtung mit Abstand gegenüber.The holding frame 7 is mounted by means of the axial projections 6 such that it is in one limited angular interval about the chuck axis 4 is pivotable. The Extreme positions of the holding frame 7, the closed and open positions of the Chuck 1 correspond, are shown in Fig. 1 and 2, respectively. For opening operation of the chuck 1 and the associated pivoting of the holding frame 7 on this one projecting through a slot 12 in the chuck housing 2, 3 Opening lever 13 attached. The length of the slot 12 limits the maximum pivoting path of the holding frame 7. The opening lever 13 is at the Outer shell 2 externally attached projection as counter support 14 in Swing direction with a distance opposite.

    Im Ruhezustand liegt jede Haltezunge 8 entspannt an einem von der Innenwand 5 der Außenschale 2 abstehenden Anschlag 15 an. Der Anschlag 15 ist derart positioniert, daß er die Haltezunge 8 nahe des Halteendes 10 an der in Schwenkrichtung weisenden Fläche berührt. Bei Verschwenkung des Halterahmens 7 und der mit diesem verbundenen Haltezunge 8 wird die Haltezunge 8 durch den in den Schwenkweg hineinstehenden Anschlag 15 nach Art einer einseitig eingespannten Stabfeder elastisch verformt, wobei diese Verbiegung in einer der Ebene des Halterahmens 7 vorgelagerten Parallelebene erfolgt. Dadurch wird das Halteende 10 radial nach außen ausgelenkt, wie aus Fig. 2 zu ersehen ist. Das Spannfutter 1 befindet sich somit in seiner Offenstellung.In the idle state, each retaining tongue 8 lies relaxed on one of the inner wall 5 of the Outer shell 2 protruding stop 15. The stop 15 is positioned in such a way that he has the holding tongue 8 near the holding end 10 at the pivoting direction touching surface. When pivoting the holding frame 7 and with this connected retaining tongue 8, the retaining tongue 8 by the in the Stop 15 protruding in the manner of a one-sided clamped Rod spring deformed elastically, this bending in one of the plane of the Holding frame 7 upstream parallel plane. As a result, the holding end 10 deflected radially outwards, as can be seen from FIG. 2. The chuck 1 is located thus in its open position.

    Ein zu spitzender Stift kann nun durch eine sowohl im Spannfuttergehäuse 2,3 als auch im Halterahmen 7 vorgesehene Durchführung 16 in das Spannfutter 1 eingeschoben werden. Nach Loslassen des Öffnungshebels 13 schwenkt das Spannfutter 1, getrieben durch die Rückstellkraft der gebogenen Haltezungen 8, selbsttätig in Richtung seiner Schließstellung zurück. Dabei wird der eingeführte Stift von den zurückstrebenden Halteenden 10 koaxial zur Spannfutterachse 4 orts- und drehfest bezüglich des Spannfutters 1 eingespannt.A pin to be sharpened can now be inserted both in the chuck housing 2, 3 and bushing 16 provided in the holding frame 7 is inserted into the chuck 1 become. After releasing the opening lever 13, the chuck 1 pivots, driven by the restoring force of the curved retaining tongues 8, automatically in Back towards its closed position. The inserted pin is removed from the striving holding ends 10 coaxial to the chuck axis 4 fixed and rotatable clamped with respect to the chuck 1.

    Der Montagevorgang erfolgt, wie in Fig. 6 angedeutet: Zunächst wird das Spannfutter 1 entlang der gestrichelten Linien und gemäß Fig. 1 in die Außenschale 2 eingelegt. Danach wird diese durch die Innenschale 3 verschlossen. Die Innenschale 3 ist gemäß Fig. 7 im wesentlichen eben gestaltet und trägt auf ihrer Innenwand 17 ein Netz von Versteifungsrippen 18. Die Verbindung zwischen Außen- 2 und Innenschale 3 wird dabei über eine in herkömmlicher Weise gestaltete Schnappverbindung 19 hergestellt.The assembly process takes place, as indicated in FIG. 6: First, the chuck 1 inserted into the outer shell 2 along the dashed lines and according to FIG. 1. Then it is closed by the inner shell 3. The inner shell 3 is in accordance with Fig. 7 designed substantially flat and carries a network of on its inner wall 17 Stiffening ribs 18. The connection between the outer 2 and inner shell 3 is thereby produced via a snap connection 19 designed in a conventional manner.

    Das Spannfuttergehäuse 2,3 ist über eine Axialführung 20 an einem nicht dargestellten, die Fräsermechanik enthaltenden Maschinengehäuse axial verschiebbar geführt. Diese Axialführung 20 ist einstückig an die Außenwand 21 der Innenschale 3 angeformt. The chuck housing 2, 3 is connected to an unillustrated, the machine housing containing the milling mechanism is guided axially displaceably. This Axial guide 20 is integrally formed on the outer wall 21 of the inner shell 3.

    BezugszeichenlisteLIST OF REFERENCE NUMBERS

    11
    Spannfutterchuck
    22
    Außenschaleouter shell
    33
    Innenschaleinner shell
    44
    SpannfutterachseChuck axis
    55
    Innenwandinner wall
    66
    Axialvorsprungaxial projection
    77
    Halterahmenholding frame
    88th
    Haltezungeholding tongue
    99
    Stirnflächeface
    1010
    Halteendeholding end
    1111
    Halterilleretaining groove
    1212
    Schlitzslot
    1313
    Öffnungshebelopening lever
    1414
    Gegenhaltcounterhold
    1515
    Anschlagattack
    1616
    Durchführungexecution
    1717
    Innenwandinner wall
    1818
    Versteifungsrippestiffening rib
    1919
    Schnappverbindungsnap
    2020
    Axialführungaxial guidance
    2121
    Außenwandouter wall

    Claims (7)

    1. Pencil sharpener with clamping chuck (1) by means of which a pencil which is to be sharpened is clamped coaxially with a clamping-chuck axis (4) by means of radially retaining tongues (8) and which is mounted in a clamping-chuck housing (2, 3), it being possible for the tongues (8) of the clamping chuck (1) to be released from the pencil together by a pivoting movement counter to spring pressure, characterized in that the retaining tongues (8) are each fastened rigidly, at one end, on a retaining frame (7), which encloses the clamping-chuck axis (4), at a spacing therefrom, approximately annularly and can be pivoted about the clamping-chuck axis (4), and in that the clamping-chuck housing (2, 3) bears stops (15) which project axially into the pivot path of the retaining tongues (8) and, when the retaining frame (7) is pivoted in relation to the clamping-chuck housing (2, 3), bend the retaining tongues (8) elastically out of their clamping position, in the manner of bar springs which are clamped in at one end, such that their retaining ends (10) are deflected outwards and release the pencil.
    2. Pencil sharpener according to Claim 1, characterized in that the retaining tongues (8) and the retaining frame (7) are in one piece and consist of elastic plastic material.
    3. Pencil sharpener according to Claim 2, characterized in that the retaining frame (7) and the retaining tongues (8) consist of polyoxymethylene.
    4. Pencil sharpener according to one of Claims 1 to 3, characterized in that, in the rest state, the clamping chuck (1) is positioned, with the retaining tongues (8) relieved of stressing, in a pivot guide of the clamping-chuck housing (2, 3).
    5. Pencil sharpener according to one of Claims 1 to 4, characterized in that the retaining frame (7) forms approximately a circular ring and is mounted such that it can be rotated over a limited angle range about the clamping-chuck axis (4).
    6. Pencil sharpener according to one of Claims 1 to 5, characterized in that, for its pivoting actuation, the retaining frame (7) is provided with an opening lever (13) which projects essentially radially out of the clamping-chuck housing (1).
    7. Pencil sharpener according to Claim 6, characterized in that a housing protrusion which acts as a support (14) for the pivoting actuation is arranged on the outside of the clamping-chuck housing (2, 3), at a peripheral spacing from the opening lever (13).
    EP98964450A 1997-12-18 1998-11-26 Pencil sharpener Expired - Lifetime EP1040016B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19756399 1997-12-18
    DE19756399A DE19756399C1 (en) 1997-12-18 1997-12-18 Rod clamping chuck for machine finishing rod tip
    PCT/EP1998/007649 WO1999032306A1 (en) 1997-12-18 1998-11-26 Pencil sharpener

    Publications (2)

    Publication Number Publication Date
    EP1040016A1 EP1040016A1 (en) 2000-10-04
    EP1040016B1 true EP1040016B1 (en) 2002-09-18

    Family

    ID=7852441

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98964450A Expired - Lifetime EP1040016B1 (en) 1997-12-18 1998-11-26 Pencil sharpener

    Country Status (7)

    Country Link
    US (1) US6334475B1 (en)
    EP (1) EP1040016B1 (en)
    JP (1) JP4350304B2 (en)
    CN (1) CN1116992C (en)
    DE (1) DE19756399C1 (en)
    ES (1) ES2182393T3 (en)
    WO (1) WO1999032306A1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
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    TWI819427B (en) * 2021-12-06 2023-10-21 堡勝企業股份有限公司 Pen feeding mechanism and pencil sharpener having the same

    Families Citing this family (13)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US6886614B2 (en) 2002-05-16 2005-05-03 Hunt Holdings, Inc. Pencil sharpener
    DE10355194B4 (en) * 2003-11-26 2006-01-26 Dahle Bürotechnik Gmbh Pencil sharpener
    DE202007010551U1 (en) * 2007-07-28 2008-12-11 Dahle Bürotechnik Gmbh Pencil sharpener
    US8016004B2 (en) * 2008-10-01 2011-09-13 Anwar Farooq More silent and robust electric pencil sharpener
    US20130147104A1 (en) * 2010-08-30 2013-06-13 Carl Mfg. Co., Ltd. Pencil sharpener
    TW201542424A (en) * 2014-05-09 2015-11-16 Sdi Corp Automatic cover opening device
    CN104354507B (en) * 2014-10-21 2016-05-25 顺德工业(江苏)有限公司 The filings-blocking equipment of penknife pen-laying hole
    CN106738091B (en) * 2016-12-20 2019-01-15 重庆名风家俱有限公司 Sharpener
    CN110333365A (en) * 2019-07-24 2019-10-15 黄河科技学院 With the cup item of migration reaction cup in immunoassay detection
    CN112248697B (en) * 2020-10-15 2021-12-24 云阳县凤鸣镇凤鸣小学 Pencil sharpener for stationery
    DE102020132446A1 (en) * 2020-12-07 2022-06-09 Eisen Gmbh Device for sharpening at least one pencil
    US11273666B1 (en) * 2021-04-20 2022-03-15 Samir Moufawad Moufawad Pencil sharpener
    CN116766814B (en) * 2022-10-27 2024-09-20 得力集团有限公司 Pen clamping mechanism for pencil sharpener

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    DE472725C (en) * 1929-03-11 Weiss Johann Chuck for pen sharpening machines
    DE396839C (en) * 1923-05-03 1924-06-23 Emil Grantzow Chuck with drivers running in guide curves
    CH181271A (en) * 1935-03-20 1935-12-15 Injecta Ag Pencil sharpener.
    DE702445C (en) * 1938-09-02 1941-02-07 A W Faber Castell Bleistift Fa Jig for pencil sharpening machines
    DE808425C (en) * 1949-04-07 1951-07-16 Ernst Plank Fa Chuck for sharpening machines for pens
    DE1063934B (en) * 1959-03-13 1959-08-20 Faber Castell A W Clamping device for pencil sharpening machines
    US3227140A (en) * 1964-06-05 1966-01-04 Apsco Products Inc Pencil sharpener

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    TWI819427B (en) * 2021-12-06 2023-10-21 堡勝企業股份有限公司 Pen feeding mechanism and pencil sharpener having the same

    Also Published As

    Publication number Publication date
    ES2182393T3 (en) 2003-03-01
    WO1999032306A1 (en) 1999-07-01
    JP4350304B2 (en) 2009-10-21
    DE19756399C1 (en) 1999-01-14
    EP1040016A1 (en) 2000-10-04
    CN1116992C (en) 2003-08-06
    US6334475B1 (en) 2002-01-01
    CN1282297A (en) 2001-01-31
    JP2001526139A (en) 2001-12-18

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