EP3381708A1 - Pencil sharpener with guide member for removing chips - Google Patents

Abstract

A pencil sharpener (1) having a sharpener body (2), with at least one guide cone (7) arranged in the sharpener body (2) for guiding the pen tip (5) during the sharpening and with a cutting blade fixed tangentially to the guide cone (7) on the sharpener body (2) (3) for stock removal of the pen tip (5) such that the pen tip (5) at the front end with a tapered lead portion (24) without shell material and in the central longitudinal direction (20) of the pin (4) adjoining shell portion (26) a mine casing (23) of casing material embedding the mine (25) of the pin (4) with one in the region of the main cutting edge (12) of the cutting blade (3), to the pen tip (5) in the region of the parting line (27) in the transition region between the mine section (24) and shell section (26) acting, non-machining on the pen tip (5) acting guide element (16) such that the chips of the lead material in the mine section (24) and the chips of the jacket material in the jacket section (26) flow away from each other separately.

Description

The invention relates to a pencil sharpener.

The starting point for the invention is a pencil sharpener according to the preamble of claim 1. According to the prior art, such pencil sharpeners have a sharpener body and at least one guide cone arranged in the sharpener body. The guide cone is used to guide the penpoint tip of the pin to be pointed during the sharpening process. Furthermore, at the pencil sharpener in the region of the guide cone, a cutting knife set tangentially to the guide cone is fixed on the sharpener body for stock removal of the pen tip.

With such sharpeners, all the pins can be sharpened, in particular wood-edged or plastic-tipped pens. The pins have a mine as well as a mine casing embedding in the mine. The mine is thus initially completely surrounded by the mine jacket.

Due to the designed as a hollow cone guide cone on the sharpener body and arranged on the sharpener body tangentially to the guide cone cutting blade is created when stocking a pin end a tapered pen tip. In this case, the pen tip has a lead portion completely exposed from the jacket material of the lead jacket and a shell portion adjoining it in the center longitudinal direction of the pencil. In the area of the mantle section, the mine continues to be fixed in the mine jacket and enclose on all sides. However, the jacket material in the region of the jacket section is also partially ripped off so that the jacket section also tapers conically and, ideally, merges seamlessly into the mine section.

Since the mine and the mine mantle already exist because of their completely different technical function of different materials or materials, created during stockpiling of the pen tip also completely different shavings.

From the DE 32 04 927 C1 a container sharpener is known in which the abgespante lead material on the one hand and the abgespante casing material on the other hand are collected in different chip collecting spaces. For this purpose, a chip collecting space is arranged both above and below the plane formed by the cutting blade and its adjacent areas. The chip collecting space above the cutting knife serves to catch the mine shell material and the chip collecting space located below the cutting knife serves for the storage of the mined mine material. Both catchment areas are connected by slots designed in the manner of a sieve. When sharpening the abgespante mine material forms a trained in the manner of a helical chip long chip, which runs into the above the cutting blade arranged Spanauffangraum inside. In this way it is ensured that only shell material is actually collected in the chip collecting space arranged above the cutting blade. The much lighter and finer grain-like abgepante mine mining material falls either directly into the arranged below the cutting blade chip collecting space or passes together with the shell material in the above the cutting blade arranged chip collecting space and is then sieved as it were in the lower chip collecting space. In this case, it can not be ruled out that residues of the lead material remain in the chip collecting space provided for the casing material, so that the casing material does not ultimately remain sorted.

From JP H02-144 499 U a pencil sharpener with open-topped container is known. As can be seen from the drawing figures, the cutting blade in the local pencil sharpener is shaped in a special way in order to produce a crowned pen tip during sharpening. From the DE 10 2010 031 915 A1 Finally, a sharpener is known, which a paring knife to create a pen tip and a contour tool for introducing a paragraph between the pen tip and the pin shell having. A collecting container for abgespantes material is not discussed in this document.

In view of all these facts, the invention has for its object to make a pencil sharpener so that the costs incurred during the removal of the pen tip shavings of lead material on the one hand and of sheath material on the other hand each sorted sorted.

This object is achieved by the feature combination of claim 1 in an inventive manner. The dependent claims include in part advantageous and in part self-inventive developments of this invention.

The invention is based on the basic idea to arrange a guide element in the region of the main cutting edge of the cutting blade. This guide element acts exactly in the region of the dividing line in the transition region between the mine section and the jacket section on the pen tip. The guide element acts like a traffic island in the traffic flow, the separation of Spanabflussstromes of the lead material on the one hand and the mine jacket material on the other. As a result of this embodiment, the material separation between mine material and casing material takes place immediately at the point of action, ie at the point at which the chips actually arise. In this way it is effectively prevented that the abgespanten materials, so the resulting chips unintentionally mix. Rather, a separate removal of the chips, so the lead material on the one hand and the mine jacket material on the other hand effectively guaranteed.

This strictly separate disposal of mine material and mine jacket material is advantageous, for example, in those cases in which either the mine material or the mine jacket material is to be reused or reprocessed. Often, in such reprocessing processes, the variety unit is a mandatory prerequisite.

Finally, it is also conceivable, for example in the artistic or cosmetic field, that the lead material should be further processed separately from the pencil, because special, desired by the user effects can be achieved by applying the lead material without a pen, such as a brush or a similar tool, which require the varietal purity of the chips.

In an advantageous embodiment, the guide element along the main cutting edge of the cutting blade is longitudinally displaceable. In this way, pen tips with different lengths of mine sections can be realized with strict retention of the chip separation, namely the separation of shavings from mine material and chips from mine casing material. In this way, the application flexibility of the pen tip or its field of application is significantly increased. In addition or alternatively, the guide element can be made rotatable relative to the main cutting edge of the cutting blade.

In a further embodiment, it is provided to adapt the guide element either at the top or at the bottom of the cutting blade. In an alternative embodiment, the guide element is adapted to both sides of the cutting blade. In a special embodiment, the guide element can also wrap the cutting blade on both sides.

A further preferred embodiment consists in the design of the guide element as a Spanabflussfuge bridging guide rib.

In a further preferred embodiment, the guide element is fixed to the body edge opposite the body edge and the adjoining region of the body. In this case, the guide element, in an advantageous embodiment, in turn at least partially bridges the chip discharge gap formed between the main cutting edge and the body edge. Also in this embodiment, the guide element to the main cutting edge of the cutting blade can be designed longitudinally displaceable and / or against the main cutting edge of the cutting blade rotatable.

In a further embodiment of the invention, it may also be provided to arrange a plurality of guide elements distributed over the circumference of the pen tip.

Finally, it is proposed in a further embodiment to form the guide element in one piece on the sharpener body. Also, the guide projection may be formed as integrally formed both on the main cutting edge and on the body edge chip breaker edge.

In general, many different variants of the fixation of the guide element on the pencil sharpener are conceivable. In addition to the aforementioned one-piece Anformung the guide on the sharpener body and its releasable fixation on the sharpener body is also possible. Thus, the guide element can be fixed both on the sharpener body and on the cutting blade by means of a plug connection. It is also possible to screw the guide element on the pencil sharpener. For this purpose, the usually already existing fastening screw for the cutting blade on the sharpener body is particularly advantageous. Furthermore, it is also possible to adapt the guide element to a sharps container of a container tip. Also other accessories such as cleaning sticks or other attachments, such as those in the EP 1 070 601 A1 are described as a support plate, are for fixing the guide element conceivable and suitable.

In a further advantageous embodiment, the guide element is designed as a guide projection. It is advantageous to arrange this guide projection in the area of the chip removal joint, which is usually formed on the other hand between the main cutting edge of the cutting blade on the one hand and the body edge of the sharpener body opposite in the transverse direction of the cone. The guide projection can be configured as a wedge-shaped separating wedge.

This design is very well combined with a two-part chip collection container. This chip collecting container has two separate chip collecting chambers for the mined mine material on the one hand and the abgespante casing material on the other. The two Spanauffangkammern border along a common Dividing joint together. At the edge of one or both chip collecting chambers a guide projection is advantageously formed in the region of the parting line, which protrudes into the Spanabflußfuge formed between the main cutting edge of the cutting blade and opposite in the cone transverse direction of the body corpus chip removal with closed chip collecting container.

Fig. 1

eine Draufsicht auf ein Ausführungsbeispiel des Stiftspitzers gemäß der vorliegenden Erfindung,

Fig. 2

den Bereich des Stiftspitzers mit dem Leitelement gemäß dem Schnitt II-II in Fig. 1 als Detaildarstellung,

Fig. 3

die Seitenansicht aus der Blickrichtung gemäß Richtungspfeil III in Fig. 1,

Fig. 4

den Schnitt IV-IV aus Fig. 3,

Fig. 5

eine perspektivische Ansicht des in Fig. 4 gezeigten Schnitts,

Fig. 6

das Detail VI aus Fig. 1,

Fig. 7

eine perspektivische Darstellung einer Ausführungsform desStiftspitzers mit einem am Stiftspitzer adaptier baren Reinigungsstäbchen und mit einem am Reinigungsstäbchen fixierten Leitelement vor der Montage,

Fig. 8

den Stiftspitzer gemäß Fig. 7 mit am Spitzerkorpus fixiertem Reinigungsstäbchen in einer Montagezwischenstellung,

Fig. 9

den Stiftspitzer aus Fig. 8 in seiner Montageendstellung,

Fig. 10

das Detail X aus Fig. 9,

Fig. 11

eine Explosionsdarstellung eines Stiftspitzers mit einem in den Spitzerkorpus einsetzbaren Formwerkzeug zum Formen der Minenspitze und mit einem am Formwerkzeug angeformten Leitelement,

Fig. 12

den Stiftspitzer aus Fig. 11 mit eingesetztem Formwerkzeug,

Fig. 13

.eine perspektivische Darstellung eines Stiftspitzers mit einem zweigeteilten Spanauffangbehälter in Schließstellung,

Fig. 14

den Stiftspitzer aus Fig. 13 mit teilweise geöffnetem Spanauffangbehälter sowie

Fig. 15

eine Seitenansicht der die Trennfuge bildenden Seitenwand eines Spanauffangteil behälters.

Reference to the embodiment shown in the figures, the invention is explained in more detail. Show it:

Fig. 1

a top view of an embodiment of the pen nib according to the present invention,

Fig. 2

the area of the pen point with the guide element according to the section II-II in Fig. 1 as a detail,

Fig. 3

the side view from the viewing direction according to directional arrow III in Fig. 1 .

Fig. 4

the section IV-IV Fig. 3 .

Fig. 5

a perspective view of the in Fig. 4 shown section,

Fig. 6

the detail VI off Fig. 1 .

Fig. 7

a perspective view of an embodiment of the pencil sharpener with an adaptable on the pen sharpener cleaning sticks and with a cleaning rod fixed on the guide element before assembly,

Fig. 8

the pencil sharpener according to Fig. 7 with cleaning sticks fixed on the sharpener body in an assembly intermediate position,

Fig. 9

the pencil sharpener Fig. 8 in its final assembly position,

Fig. 10

the detail X out Fig. 9 .

Fig. 11

an exploded view of a pencil sharpener with an insertable into the sharpener mold forming tool for forming the lead tip and with an integrally formed on the mold guide element,

Fig. 12

the pencil sharpener Fig. 11 with inserted mold,

Fig. 13

.A perspective view of a pencil sharpener with a two-part chip collecting container in the closed position,

Fig. 14

the pencil sharpener Fig. 13 with partially opened chip collecting container as well

Fig. 15

a side view of the parting line forming side wall of a chip receiving part container.

The pencil sharpener 1 essentially consists of a sharpener body 2 and a cutting blade 3 screwed onto the upper side of the sharpener body 2 in the exemplary embodiment. In the illustration of FIG Fig. 1 the pin 4 to be sharpened is indicated schematically. The pin end of the pin 4 with the pin tip 5 resulting from the sharpening process is introduced through a cone insertion opening 6 into a guide cone 7 arranged in the sharpener body 2. The cone insertion opening 6 passes through a body side wall 8 for this purpose. The body side wall 8 runs perpendicular to the in Fig. 1 In the carcase cover surface 9, a knife seat 10 is formed for the cutting blade 3. The cutting blade 3 is fixed in the knife seat 10 by means of a fastening screw 11.

The cutting blade 3 in turn has a main cutting edge 12. The main cutting edge 12 forms the actual sharpener blade for stocking off the pen point 5 when sharpening the pen 4. The main cutting edge 12 extends tangentially to the sharpener cone 2. The main sheath 12 is in the transverse direction 13 of the corpus edge 14 opposite. The main cutting edge 12 and the body edge 14 are spaced in the cone-transverse direction 13 so that they define a Spanabflussfuge 15 between them. When sharpening the pen tip 5, the abgespanten chips flow through this Spanabflussfuge 15 on the effective as sharpener blade main cutting edge 12 and the in Fig. 1 visible top of the cutting blade 3 relative to the sharpener body 2 to the outside.

In the presentation of the Fig. 2 The guide element 16 is in this case with its fixed end 17 in the region of the body edge 14 and in the embodiment of the Fig. 1 and Fig. 2 Fixed to the left of the body edge 14 adjacent region of the body deck surface 9. The guide element 16 bridges - in Fig. 2 clearly visible - the Chipabflussfuge 15 in the cone transverse direction 13 and protrudes in Konusquerrichtung 13 over the main cutting edge 12 and the adjoining top surface of the cutting blade 3 addition. At its beyond the top surface of the cutting blade 3 in the cone transverse direction 13 free end 18 carries the guide element 16 a further guide fin 19th

The Fig. 4 shows the extending in its central longitudinal direction 20 pin 4, whose in Fig. 4 left end of the body side wall 8 passes through the Konuseinführöffnung 6 and is abgespant by a rotational movement in the direction of rotation 21 to the pen tip 5. In Fig. 4 The guide channel 22 serves as a sliding guide of the pin 4 in the region of the pen tip 5 distant, unspiked and non-machined outer sheath.

The pin 4 consists first of its mine jacket 23 and the mine 23 embedded in the mine jacket 23. The mine jacket 23 consists of jacket material and the mine 25 accordingly mine material.

The main cutting edge 12 of the cutting blade 3 shears off the pen tip 5 in such a way that a mine section 24 free of the lead jacket 23 and the lead jacket material is formed. In the middle longitudinal direction 20 in Fig. 4 In the transition region from the mine section 24 to the shell section 26 in the central longitudinal direction 20 of the pin 4, a dividing line 27 forms. In the region of this dividing line 27, the guide element 16 engages the pin tip 5. In this way, the guide member 16 separates the mined in the mine section 24 from the lead tip chips from the abgespanned by the shell portion 26 chips. Both the chips from the mine section 24 and the chips separated therefrom flow out of the sharpener body 2 through the chip removal joint 15.

From the representation of Fig. 6 It can be seen that the chips from the mine section 24 flow away from the sharpener body 2 in the lead discharge direction 28, while the chips shaved from the jacket section 26 escape from the sharpener body 2 as seen in the central longitudinal direction 20 in the opposite jacket drainage direction 29. For the sake of clarity, it should be noted that the central longitudinal direction 20 of the pin 4 corresponds to the central longitudinal direction 20 of the sharpener body 2 when the pin 4 - as in Fig. 4 and Fig. 5 shown - rests in the sharpener body 2 and in the guide cone 7 and in the guide channel 22.

In the presentation of the Fig. 7 in turn, a pin 4 is inserted into the guide cone 7 in the sharpener body 2 of the pencil sharpener 1. At the sharpener housing 2 hook-shaped receiving arms 30 are attached. These receiving arms 30 form a latching bearing for a cleaning rod 31. The cleaning rod 31 forms with the receiving arms 30 a snap connection and is verschnappbar on the sharpener body 2 of the pen tip 1. With the cleaning rod 31, the guide cone 7 and the Spanabflussfuge 15 can be cleaned. On the cleaning rod 31, the guide element 16 is integrally formed. The guide element 16 is transverse to the central longitudinal axis of the cleaning rod 31 in the transverse direction 13 of the cone. The guide element 16 carries at its in the final assembled state ( Fig. 9 and Fig. 10 The extension 32 protrudes with its concave recess 33 into the Chipabflussfuge 15 in that the recess 33 the pin in the region of the dividing line 27 between the mine section 24 and the shell section 25th affected. From the representation of Fig. 8 results in the mounting of serving as a carrier for the guide element 16 cleaning rod 31. The cleaning rod 31 is pushed between the opposing pairs of receiving arms 30 to the cleaning rod 31, the in Fig. 8 shown intermediate position occupies. The receiving arms 30 and the outer jacket of the substantially cylindrical cleaning rod 31 form a hinge bearing. The cleaning rod 31 is made of the in Fig. 8 shown position then turned so far to the right that guide element 16 in Fig. 9 and Fig. 10 achieved Montageendstellung shown, namely engages with its extension 32 in the Spanabflussfuge 15.

This in Fig. 11 Forming tool 34 consists of a molding template 35, which is rounded off in the exemplary embodiment, for shaping the lead tip of the lead 25 of the pin 4. The forming tool 34 also has a grip tab 36 for mounting and dismounting the forming tool 34 on the sharpener 1 or its sharpener body 2. Furthermore, in the embodiment of Fig. 11 to the left of the gripping tab 36 a support plate 37 is formed. From the support plate 37 is transverse to the guide element 16. The guide element 16 is thus supported by the support plate 37. Relative to the embodiment of the Fig. 11 For example, the molding tool 34 can be easily inserted from below into the sharpener body 2. For fixing the molding tool 34 in the sharpener body 2, a hook-like projection 38 is formed on the grip tab 36. In the in Fig. 12 As shown, this hook-like projection 38 engages behind the upper edge of a fastening rib 39 formed in the pin body 2. Thus, the molding tool 34 and the sharpener body 2 also form a snap connection for fixing the molding tool 34 in the sharpener 1.

In the final assembled state in turn protrudes the guide element 16 in the transverse direction 13 of the cone from the support plate 37 and in the cutting edge of the cutting blade 3 adjacent Spanabflussfuge 15 into it. The formation of the guide element 16 on the mold 34 corresponds to the formation of the guide element 16 on the cleaning rod 31. Also in the embodiment of the Fig. 11 and Fig. 12 used guide element thus has one in the final assembled state ( Fig. 12 ) protruding into the Chipabflussfuge 15 extension 32 with a concave recess 33.

Fig. 13 shows a further embodiment of the pencil sharpener 1 with its sharpener body 2 and with an attached to the top of Spitzerkorpuses 2 chip collecting container 40. The chip collecting container 40 is composed of two identical in the exemplary embodiment sub-containers 41, 41 'composed. The sub-containers 41, 41 'are mutually mirror-inverted placed on the sharpener body 2 and form between them a parting line 42.

The sub-containers 41, 41 'are formed substantially hollow cuboid. For this purpose, they each have a cover surface 43, two narrow side walls 44, an outer side wall 45 and an inner side wall 46. The cover surface 43 facing away from the bottom of the container part 41, 41 'is open. With their open bottoms, the sub-containers 41, 41 'are slipped over the top of the sharpener body 2 and over the Spanabflußfuge 15 and the adjacent cutting blade 3. The chips resulting from sharpening fall through the Spanabflußfuge 15 in the respective sub-containers 41, 41 '.

The sub-containers 41, 41 'are in the closed position of the pen tip 1 with their inner side walls 46 together. The inner side walls 46 thus form the parting line 42 running in the direction of the cone 13 between them. The parting line 42 bridges as it were the cutting blade 3 and the Spanabflußfuge 15 in the transverse direction 13 of the cone. The inner side walls 46 have approximately at their center in each case a bend 47. In the region of the bend 47, a guide element 16 designed as a guide projection is integrally formed on the edge of the inner side wall 46. This designed as a guide projection guide element 15 protrudes with attached chip collecting container 40 and the attached sub-containers 41, 41 'from above into the Spanabflußfuge 15. However, it is sufficient to form a guide element 16 only at one of the sub-containers 41, 41 '.

Finally, at the in the Fig. 13 and Fig. 14 invisible underside of the sharpener 1 another chip collecting container 40 may be arranged. Also is in Fig. 13 and Fig. 14 a cap 48 closing the guide cone 7 is visible.

With the invention, it is thus possible to dispose of the chips formed during sharpening in opposite directions of discharge, namely the lead discharge direction 28 and the jacket discharge direction 29 and thus to ensure a complete separation of the chips. In the embodiment according to the FIGS. 13 to 16 the separated chips are disposed of on the one hand in the sub-container 41 and the other in the sub-container 41 '. LIST OF REFERENCE NUMBERS 1 pencil sharpener 30 pickup 2 Spitzer body 31 Swab 3 cutting blade 32 extension 4 pen 33 concave recess 5 pen tip 34 mold 6 Konuseinführöffnung 35 form template 7 guide cone 36 grip tab 8th Body side wall 37 support plate 9 Body cover surface 38 head Start 10 knife seat 39 fixing rib 11 fixing screw 40 Clamping receptacle 12 main cutting edge 41.41 ' Part container 13 Cone transverse direction 42 parting line 14 cabinet edge 43 cover surface 15 Spanabflussfuge 44 Narrow side wall 16 vane 45 Outside wall 17 fixed end 46 Inside wall 18 free end 47 bend 19 guiding fin 48 cap 20 Means longitudinally 21 direction of rotation 22 guide channel 23 mine cloak 24 mine section 25 mine 26 shell section 27 parting line 28 Mine drainage direction 29 Coat outflow direction

Claims (10)

Pencil sharpeners (1) With a sharpener body (2), • With at least one in the sharpener body (2) arranged guide cone (7) for guiding the pen tip (5) during tipping and • with a tangential to the guide cone (7) on the sharpener body (2) fixed cutting blade (3) for stocking off the pen tip (5) such that the pen tip (5) at the front end a tapered lead portion (24) without shell material and an in Central longitudinal direction (20) of the pin (4) adjoining shell portion (26) having a mine (25) of the pin (4) embedding mine shell (23) of jacket material marked by
in the region of the main cutting edge (12) of the cutting blade (3) arranged on the pen tip (5) in the region of the dividing line (27) in the transition region between mine section (24) and shell section (26), non-cutting on the pen tip (5) acting guide element (16) such that the chips of the lead material in the lead portion (24) and the shavings of the cladding material in the shell portion (26) flow apart separated. A pencil sharpener (1) according to claim 1
marked by
a guide element (16) mounted on the cutting blade (3) and longitudinally displaceable and / or rotatable in the longitudinal direction of the main cutting edge (12) of the cutting blade (3). A pencil sharpener (1) according to claim 1 or 2
characterized by a Spanabflussfuge (15) bridging guide rib as a guide element (16). A pencil sharpener (1) according to claim 1
characterized, • that the guide element (16) on the main cutting edge (12) opposite the body edge (14) and the adjoining portion of the sharpener body (2) is fixed and • that the guide element (16) projects in the direction of the main cutting edge (12) in such a way that the guide element (16) at least partially bridges over the chip removal joint (15) formed between the main cutting edge (12) and a body edge (14). Pencil sharpener (1) according to claim 4
characterized,
that the guide element (16) is detachably fixed on the sharpener body (2). A pencil sharpener (1) according to claim 1
characterized,
in that the guide element (16) is fixed to a functional part which is detachably fixed to the sharpener body (2). Pencil sharpener (1) according to claim 6
marked by
a cleaning rod (31) as a functional part. Pencil sharpener (1) according to claim 6
marked by
a mold (34) as a functional part. A pencil sharpener (1) according to claim 1
marked by
a guide projection arranged as guide element (16) in the region of the chip removal joint (15) between the main cutting edge (12) of the cutting blade (3) and the body edge (14) of the sharpener body (2) opposite the cone transverse direction (13). Pencil sharpener according to claim 9
characterized
in that the guide projection is arranged on the parting line (47) of a chip collecting container (40) divided into two parts by the parting line (47).

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