DE10109167A1 - Pencil sharpener, for lead or cosmetic pencils, has housing with cutting device and holding device for pencil moved along predetermined path of movement in housing through automatic guiding device - Google Patents

Abstract

The pencil sharpener has a housing (10) with cutting device (12) and a holding device for the pencil (16). The holding device is housed at least in part in the housing and an automatic guiding device moves the holding device along a predetermined path of movement in the housing. The automatic guiding device has at least one guide element engaging in a guide path.

Description

The invention relates to a pencil sharpener for a Mi ne, such as pencils, crayons and especially Kos metallic pens and the like.

Already known sharpeners have a housing with an opening into which a pen to be sharpened can be inserted. One end of this pin contacts an angled cutting edge aligned with the longitudinal axis of the pin such that during a rotary movement or helical movement of the Pin around its longitudinal axis a tapered cutting surface surface at the end of the pin.

These known sharpener can be used to sharpen pens in the essential cylindrical lead are used in which a Carrier body encased this lead, which is usually made of wood is made and a circular or hexagonal cross cut has.

With many types of pens, but especially with cosmetics donate and the like there is a desire, not the tip to be conical. This is one of the reasons justifies that the material for these tips is very soft and that on the one hand you have good strength of the mine, on the other hand, a not too large contact area to apply the material of the tip.

The invention is therefore based on the object of an attack zer to create pens, which is technically is designed like this. In particular, the invention is the  The task is to use a sharpener to sharpen pens create through which pens with essentially any Cross section of the carrier body and the mine on reliable Way can be pointed.

The object is achieved by a sharpener according to claim 1.

Preferred developments of the invention are the subject of Dependent claims.

According to the invention, a pencil sharpener is proposed, which a cutting device, a holding device for the Pen, at least one housing and a positive guidance device tion.

According to the invention, the pin is in particular held by the holder direction added. The holding device engages in front preferably the pen on its outer circumference. The holding device device is arranged within the sharpener in such a way that a free end of the pen to be sharpened located outside the holding device so that it is the cutting can contact facility. Preferably the pin is in held rotatably within the holding device, so that a Ro prevented around an axis parallel to its longitudinal axis becomes. The pin to be sharpened is particularly preferred conclusively recorded in the holding device. Preferably the pin in the holding device is axially displaceable with respect its longitudinal axis mounted so that it is in the direction of the Schnei device can be moved.

The housing preferably has at least two housing parts on, of which a housing part is a cover. The housing parts are connected. In particular, the housing parts  welded together, especially with ultrasound welded, glued or screwed.

The positive guidance device has at least one guide element ment and at least one guideway in which the Füh tion element is forced when tip of the pin.

The guideway is in particular ge from a cam forms or has one. The is particularly preferred Guideway formed by a groove. It is preferred that the Guideway is formed by a profiling. Especially the guideway is preferably formed by a groove which has a constant or varying groove depth. One means a varying groove depth, or a positive guidance or the com Combination of these positive guides is special according to the invention prefers.

According to a particularly preferred embodiment of the invention a disk extends concentrically around the holding device device that can hold the pen, being on the outer circumference this disc has a groove with a variie along the circumference renden groove depth is provided so that at least one fixed with the guide pin connected to the housing engages in this groove and the position of the pin or the holding device opposite changed the housing according to a predetermined characteristic.

Egg is particularly preferred on one or both end faces ner concentrically extending around the holding device Disc grooves arranged, each in the housing engage firmly connected guide pins, these grooves are alike in terms of their course, or at least are alike distinguish by their course.  

The guideway or groove is a closed path. The The guide element is particularly preferably made of a guide pin formed, which is guided in particular in a groove.

Several differently shaped guideways are preferred intended.

Even the use of a guide groove has the advantage that the holding device when rotating about the axis in front certain way can be performed.

The use of two guide grooves on both sides the disc-like approach of the holding device are and in each case one firmly connected to the housing Intervening pin has the main advantage that the Path of movement of the pin compared to that fixed in the housing ordered knives can be chosen in any way.

In the case of an elliptical pen, this is preferably the case In the event that a guideway ensures that the pen is moved up and down while the other guideway be has the effect that the pin moves against the knife and away from the knife becomes. This creates a chisel-shaped edge that is straight especially with thick colored pencils or with cosmetic pencils is advantageous.

In particular, through a suitable selection of the leadership Care must be taken to ensure that the position of the mine at Knife is optimal, and in particular that the clearance angle, the is needed for a good cut, in the optimal Be is rich.

A sharpener according to the invention can be used in particular for pens are used, which is essentially a cross-section have any shaped mine. This mine can in particular  be non-rotationally symmetrical. Preferably the cross section of this mine is elliptical. The mines Carrier can also be essentially any cross Have cutting surface and in particular elliptical training det be.

In addition, a sharpener according to the invention, in particular the others according to the training of his compulsory guidance facility tung, for a variety of other forms of mine carrier, the especially one essentially along the mine axis extending wooden shell that extends around the mine stretches and thus protects them in particular, used become.

Two grooves on the respective forehead are particularly preferred provided areas, each for the management of a fixed in Serve mounted pin.

The cutting device is particularly preferred, in particular the cutting edge, firmly arranged opposite the housing. Be the cutting edge is particularly preferably firmly connected to the housing what, in particular by means of a screw connection or same is generated.

The pin is preferably rotatably fixed in the holding device added with respect to its longitudinal axis, the holding device device, including the pen, opposite the cutting device is arranged movably. The pin is preferably form-fitting sig recorded in the holding device. When sharpening the Pin is the holding device, and thus the pin against moved over the cutter.

The pin is preferably axially ver in the holding device slidably added so that it is in the direction of the cutting device  can be moved and by means of a rotary movement the cutting surface of the pin relative to the cutting device of the pin can be shaped.

According to a particularly preferred embodiment of the invention is the positive guidance device or the course of the groove, in which engages a pin, or the cam, such trained that the clearance angle when sharpening always between 2 ° and 10 °, preferably essentially between 3 ° and 5 °, is particularly preferably 3 °. The clearance angle is preferred kept constant when sharpening the pen. Is preferred also that the clearance angle within an interval of 1 ° at Pointing lies.

The sharpener preferably has a sealing device. This Sealing device seals in particular the guideways, see above that leadership behavior is not due to penetrating materials, such as chips or the like.

The sealing washer is in particular made of a material POM and / or polyamide or Derin or Hostaform, ge manufactures, where Derin and Hostaform are product names.

The sharpener has in particular a guideway, which Allows an elliptical pen with an ellipse ratio substantially from 1.3: 1 to 1.6: 1 at substantially constant clearance angle can be pointed. Especially preferably the ellipse ratio of the pin is essentially Lichen 1.45: 1. Other ellipse ratios are as well whose forms of the pen are also preferred according to the invention.

The sharpener preferably has a container which catches the chips that arise during sharpening. Such a thing for example designed as a collecting hood or chip collecting hood  Container essentially adjoins the cutting edge and is particularly transparent.

The guide disk between two flat surfaces is preferred performed, which is a movement of the guide disc in the axial Prevent direction, i.e. perpendicular to the flat surface.

Preferably an opening in the outer wall of the housing ses through which a pin is inserted into the housing for sharpening is led through a cover, particularly as a disc is formed, at least partially covered. This cover is spring-loaded against the housing from the inside of the housing pressed. The cover has a through opening, through which is the pen and possibly part of a guide tion device for this pen extends. The passage opening voltage is dimensioned such that it adheres to the wall this passage opening all around the mounting device or the pen. Thus the housing is in the range of Opening through which the pen is inserted when sharpening and in which it is perpendicular to its longitudinal axis when pointed is essentially covered. The cover is there Movable perpendicular to the longitudinal axis of the pin relative to the housing arranged and is thus possible by the spring in each of these Chen relative positions relative to the housing against the housing pressed.

The sharpener is preferably at least partially made of one high-quality plastic, such as POM. In particular are the guideway and / or the holding device and / or the Guide pin and / or the container from a (high quality) Made of plastic.

The cutting device, or the knife, is preferably made of made of hardened steel.

In the following the invention with reference to the figures, the Er should not restrict the invention, explained in more detail.

It shows:

Figure 1 shows a first exemplary embodiment of the invention in a schematic, partially sectioned view.

FIG. 2 shows a first sectional view of the illustration according to FIG. 1;

FIG. 3 shows a second sectional view of the illustration according to FIG. 1;

FIG. 4 shows the position of the knife blade in a first position of the pin;

FIG. 5 shows the position of the knife blade in a second position of the pin;

Fig. 6 the position of the knife blade in a third position of the pin;

FIG. 7 shows the position of the knife blade in a fourth position of the pin;

Figure 8 is a second exemplary embodiment of the invention in a schematic partially sectional view; FIG.

Fig. 9 is a sectional view taken along line 9-9 of Fig. 8;

FIG. 10 shows a side view from the direction of arrow 126 from FIG. 8; and

Fig. 11 is a sectional view taken along the line 11-11 of Fig. 10.

FIG. 12 is an exemplary embodiment of the invention in a schematic representation;

Fig. 13 is a sectional view seen from the line 13-13 in Fig. 12;

Fig. 14 is a sectional view seen from the line 14-14 in Fig. 12;

Fig. 15 is a sectional view seen from line 15-15 in Fig. 12;

Fig. 16 is a sectional view seen from the line 16-16 in Fig. 12;

Fig. 17 is a sectional view seen from the line 17-17 in Fig. 12;

Fig. 1 shows an exemplary embodiment of the sharpener 1 according to the invention, which is intended to provide essentially elliptical cosmetic pencils with a substantially chisel-shaped tip.

The sharpener has a housing which is identified overall by the reference number 10 . The housing has a substantially cylindrical portion 10 a, which is partially covered by an annular plate 10 b.

At this annular plate 10 b is a substantially conical taper 10 c is formed, to which a hardened steel cutting edge 12 is attached by means of a screw 11 made of hardened steel.

The knife edge is designed in a conventional manner, which means that it is essentially designed as a flat plate which has a cutting edge 12 b and a tip 12 c on the surface facing the cutting edge ( FIG. 4).

The inner cylindrical space 10 d of the housing 10 is closed with a housing cover 13 which is substantially circular in shape and which is fastened to the housing 10 with screws 13 a, which are inserted into threaded bores 10 e in the housing.

It should be noted that instead of this screw attachment also another connection between the housing cover and the housing can be done.

A holding device is arranged inside the housing, which is denoted overall by 14.

The holding device 14 consists of a first, the contour of the pin to be sharpened tubular holding part 14 a and a substantially disc-like part 14 b, which are preferably integrally connected to one another.

The holding device 14 is received in the cylindrical cavity 10 a of the housing 10 such that the holding device can rotate relative to the housing.

For this purpose, the housing cover 10 is provided with a bore 13 b, which is designed so that it allows an undisturbed rotation of the tubular extension 14 a.

As already stated, the tubular extension 14 a is designed so that at least the inner contour of the outer contour of a pin 16 is adapted with a longitudinal axis 18 .

The disk-shaped part 14 b of the holding device has a first end face 22 and a second end face 24 . A first groove 26 is provided in the first end face 22 and a second groove 28 in the second end face 24 . A first pin 30 , which is held firmly in the housing 10 , engages in the groove 26 and a pin 32 , which is firmly held in the housing cover 13 , engages in the second groove 28 .

The dimensions of the first and second grooves 26 , 28 and the first 30 and the second pin 32 are selected so that the pins can slide in the grooves.

There is also a sealing washer 34 , which preferably consists of a plastic and is provided between the disk-shaped part 14 b and the cover 13 . This groove serves for sealing and also facilitates the movement of the annular part 14 b.

On the disc-shaped extension 10 b, as can be clearly seen in FIG. 1, a substantially conical, cup-shaped loading container 36 is provided, which was placed on an extension of the circular disc ben-shaped part 10 b. This container is preferably made of plastic, particularly preferably made of transparent plastic.

Fig. 2 shows a partially sectioned view along the Li never 2-2 in Fig. 1. Here is clearly the shape of the groove 28 to know it.

Fig. 3 shows a further sectional view, from which the shape of the groove 26 passes out. The shape of the groove or the grooves is determined in particular by a back calculation from the desired rolling motion from the tip.

As can be seen in FIG. 3, the first groove 26 is essentially elliptical, the elliptical configuration essentially corresponding to the elliptical configuration of the corresponding opening of the tubular extension 14 a of the holding device. In other words, the curved path 26 is essentially elliptical-concentric to the elliptical contour of the pin 16 .

As can be seen in FIG. 2, the second groove is also essentially approximately elliptical, but, roughly speaking, the ellipse here is tilted at an angle of 45 °. One could also speak of a distorted ellipse.

The function of the sharpener according to the invention will now be described with reference to FIGS. 4 to 7:
Since the circular disc-shaped extension 14 b of the holding device 14 is held between the disc-shaped extension 10 b of the housing and the housing cover 13 , it cannot move in one direction along the axis 18 of the pin. In relation to the housing 10 , therefore, the disc-shaped extension 14 performs a flat movement. The movement of a body can be known as the sum of a translational movement with a rotation movement about the respective current axis of rotation. In the case of a planar movement, as in the present case, this results in a total of three degrees of freedom, namely two possibilities of movement in the X and Y planes (which are not shown and which would extend here perpendicular to the axis 18 ), and a rotational movement.

Since the two guide pins 30 and 32 are anchored firmly in the housing and the two guide grooves 26 and 28 are in turn arranged fixed in the circular projection 14 b, there are two fixed points for the movement of the disk-shaped part 14 b in relation to the housing 10 , so that only one degree of freedom remains.

This means that a rotation of the pin 16 leads to an exactly predetermined movement of the holding device 14 with respect to the housing 10 and thus also in relation to the knife edge 12 firmly connected therewith.

Blank to 7 see Fig. 4, as this movement is tet decor with dark.

The knife 12 is arranged such that it rests with a Freiwin angle 40 on the tip of the pin to be shaped. When the pin 16 is rotated, as can be seen from FIGS. 4 to 7, it is moved up and down along the direction of the arrow 50 or along the direction of the arrow 52 so that the clearance angle is maintained in all positions of the pin.

On the one hand, this ensures that the tip of the pen is exact the predetermined shape, in the present case a chisel-shaped Top achieved.

Furthermore, the constant clearance angle ensures that the cutting result is uniform and that no pressure is exerted vertically on the pin (as viewed in the direction of the illustration in FIGS. 4 to 7) during the cutting.

This becomes an exact compulsion in a technically simple manner control the position of the pen with respect to the knives cutting edge achieved.

It should be noted that the chisel-shaped tip is on an elliptical pen the preferred application of the present ing invention. The solution according to the invention allows it however, any shape that is characterized by the linear overlay two cam tracks at two fixed points, these are the pins, achieves to realize.  

Fig. 8 shows a second exemplary embodiment of the invention in a schematic representation.

The sharpener 1 has a housing 10 to which a cover 60 is detachably attached. The housing 10 has a thin-walled outer wall 62 . A first intermediate part 64 and a second intermediate part 66 are arranged within the thin-walled outer wall 62 within the housing 10 .

The first 64 and the second intermediate part 66 each have a substantially flat region 68 , 70 which extends substantially perpendicular to the longitudinal axis 72 of a channel 74 , which is arranged within the holding device 14 and for receiving a pin 16 to be sharpened serves.

The first 64 and the second intermediate part 66 are accommodated in the housing in a rotationally fixed manner with respect to the longitudinal axis 72 . The first 42 and the second intermediate part 66 each have a flange 76 , 78 , which extends in the outer region 80 , 82 from a plate 80 , 86 having the flat region 68 or 70 perpendicular to the flat region 68 , 70 . With their respective outer surfaces 88 , 90 facing away from the longitudinal axis 72 , the circumferential flanges 76 , 78 lie against the outer wall 62 . The end face 92 of the second intermediate part 96 facing away from the plate 86 is supported against the first intermediate part 64 . The plate 84 of the first intermediate part 64 and the plate 86 of the second intermediate part 66 each have an essentially circular opening 94 , 96 . In the area of the opening 94 of the first intermediate part 96 , an extension 98 with a cylindrical part 100 and a conical part 102 formed thereon extends from the plate 84 in the direction facing away from the second intermediate part 66, the cylindrical part 100 and the conical part 102 are each formed from hollow.

At the end facing away from the second intermediate part 66 , the conical part 102 has an opening 104 which connects the inside of the conical part 102 with the inside of the cover 60 . On the approach 98 a knife 12 is mounted at an angle to the longitudinal axis 72 by means of a screw 11 .

Between the first intermediate part 64 and the second intermediate part 66 , a cam 20 extends parallel to the planar areas 68 , 66 , which contacts the first 64 and the second intermediate part 66 and is rotatable with respect to the longitudinal axis 72 relative to the first intermediate part 64 and the second intermediate part 66 is arranged. The cam 20 has on its two end faces 22 , 24 , the first inter mediate part 64 or the second intermediate part 66 , each because circumferential grooves 26 , 28 , which are arranged asymmetrically with respect to a plane spanned by the cam 20 plane. In these grooves 26 , 28 each extend pins, which are attached to the first intermediate part 64 or to the second intermediate part 66 , so that the path of movement, which the curve 20 can execute relative to the first intermediate part 64 and the second intermediate part 66 , through that Interaction of the pins with the grooves 26 , 28 is determined. The cam disc 20 has a through opening 106 . On the cam 20 is formed around this through hole on the side facing away from the first intermediate part 64 a tubular extension 14 a, which extends through the opening 96 of the plate 86 of the second intermediate part 66 .

The plate 86 of the second intermediate part 66 further has, on its side facing away from the first intermediate part 64, a flange 108 which extends perpendicularly to the planar region 68 and is in particular circumferentially formed, and for supporting the spring element 110 which forms in particular as a spiral spring and is supported against the second intermediate part 66 , serves. With its second end 112 , the field element 110 is supported against a disk 114 with a circumferential flange 116 . This disc 114 has a through opening 118 adapted to the outer contour of the tubular extension 14 a, through which this tubular extension 14 a extends.

The disk 114 extends essentially perpendicular to the longitudinal axis 72 and is supported with its end face facing away from the field element 110 against the housing 10 . For this purpose, the housing 10 has in particular a tubular extension 122 which extends around the longitudinal axis 22 . The disc in this way covers an opening 124 which extends in the outer wall 62 of the housing 10 and has an opening surface which is larger than the area defined by the outer circumference of the tubular extension 14 a.

FIG. 9 shows a sectional illustration along the line 9-9 from FIG. 8.

FIG. 10 shows a side view from the direction of arrow 126 from FIG. 8.

In Fig. 10 is particularly clear that the disc 44 is arranged in the direction perpendicular to the longitudinal axis 72 ge compared to the housing 10 or the tubular extension 122 of the Ge housing 10 is arranged. The respective position of the disk 114 relative to the housing 10 is determined in particular by the respective relative position of the pin 16 or the tubular extension 14 a or the cam 20 relative to the housing 10 . The under the action of the field element 110 against the housing 10 pressed disk 114 follows the plane perpendicular to the longitudinal axis 72, in particular the movement of the tubular extension 14 a, since it bears with its through opening from the outside to the tubular extension. The field element 110 prevents the disk 114 from falling off the housing 10 and, on the other hand, enables flexible mobility of the disk 114 in accordance with the mobility of the tubular extension 14 a.

FIG. 11 shows a sectional view along the line 11-11 from FIG. 10.

Fig. 12 shows an exemplary embodiment of a sharpener according to the invention.

The sharpener 100 has a cap 102 , a housing 103 , a housing insert 108 and a rotary insert 110 .

Furthermore, a pin 116 with a longitudinal axis 118 is shown in FIG. 12, which extends into the sharpener 100 . This pin 116 is not part of the sharpener 100 itself.

The housing 103 is designed in several pieces and has a first housing part 104 and a second housing part 106 .

The first housing part 104 is inserted into the second housing part 106 and is supported with the outer surface 200 of its first wall section 202 on the inner surface 204 of the second housing part 106 .

On the radially inward inner surface 206 of the first wall section 202 , a second cam guide 122 b is provided, which can cooperate with a second cam 120 b.

Radially inside the first wall section 202 , a second wall section 208 is arranged, on the radially inner inner surface 210 of which a first cam guide 122 a is provided, which can cooperate with a first cam 120 a.

The first 202 and the second wall section 208 are connected via a third wall section 212 of the first housing part 104 , which extends substantially radially inward, has a projection 214 on which the cap 102 can be supported, and on its radially inner side En de 216 has a through opening 218 .

Is at the third wall section 212, substantially in the region of the through hole 218, cut a fourth Wandungsab integrally formed 220, which tapers in the third of this wall section 212 towards remote and in the interior 221, the tip 222 was added zen to Spit of the pin 116 becomes.

A knife edge 112 extends through a — preferably slot-like — passage opening — of the fourth wall section 220 and is detachably fastened to the fourth wall section 220 by means of a screw 111 .

The second housing part 106 is substantially cup-shaped and has a housing sleeve 160 , which is preferably an essentially elliptical wall area, such as a side cover wall 224 , which is integrally formed on the housing sleeve 160 and extends essentially radially inwards , This cover wall 224 has a through opening 226 through which the pin 116 can be inserted into the housing interior 228 .

From this cover wall 224 , a fifth 230 and a sixth wall section 232 near the through opening 226 extend into the housing interior 228 , the radially inner inner surfaces 234 , 236 of which extend essentially parallel to the longitudinal axis 118 of the guide sleeve 114 .

On the inner surface 234 , the eighth cam guide 122 h is arranged, which interacts with the eighth cam 120 h.

On the inner surface 236 , the seventh cam guide 122 g is arranged, which cooperates with the seventh cam 120 g.

The housing insert, which can basically be designed in one or more pieces, is designed in two pieces in the design according to FIG. 8 and inserted into the housing 103 with a slight press fit. The parting plane of the two parts of this housing insert 108 runs essentially through a central longitudinal axis 119 of the housing 103 , it being seen in particular that these parts of the housing insert 108 are arranged in a substantially symmetrical manner to this parting plane. The two parts of the housing insert 108 are supported against one another in the circumferential direction.

The two parts of the housing insert 108 , when put together accordingly, can in principle form an essentially closed outer surface or a non-closed, at least not completely closed, outer surface.

In the design according to FIG. 12, the two parts of the housing insert 108 , correspondingly put together, form an essentially non-closed or incompletely closed lateral surface. This is Figure in the design according to. 12 implemented such that these two parts of the Gehäuseeinsat zes 108 each having a substantially closed zusammenhän constricting wall section, which forms a break-free ge stalteten sheath portion extending parallel in Umangsrichtung substantially to the longitudinal axis 118 of the Gehäuseeinsat zes 108 extends and over a section in the circumferential direction. At this respective coherent and breakthrough freely designed jacket section of the two parts of the housing insert 108 each follow tab-like extensions that extend in the circumferential direction.

In the area of this tab-like extensions is extending the outer surface of the housing insert 108 in the direction of the longitudinal axis of the housing insert 108 is not - over the entire length of this insert 108th The tabs of the different parts of the housing insert 108 support each other in the circumferential direction. In the area of these tabs of the different parts of the housing insert 108 , the outer circumferential dimension in comparison with the inner circumferential dimension of the housing shell 160 is designed such that when the housing insert 108 is inserted into the housing 103, a slight interference fit is effected.

The housing insert 108 has a third cam guide 122 c, which interacts with a third cam 120 c, a fourth cam guide 122 d, which interacts with a fourth cam 120 d, a fifth cam guide 122 e, with a fifth cam 120 e cooperates, and a sixth cam guide 122 f, which cooperates with a sixth cam 120 f.

The rotary insert 110 also has a guide sleeve 114 with a non-rotationally symmetrical, in particular elliptically designed, jacket-like wall area 238 , with which the third 120c, fourth 120d, fifth 120e and sixth 120f cam plate is connected in one piece.

On the outer surface of this rotary insert 110 , cam disks 120 a, 120 b, 120 c, 120 d, 120 e, 120 f, 120 g, 120 h are arranged.

The first 120a and the eighth cam 120 are respectively che h of a portion of the radially outer Außenoberflä 240 of the jacket-like wall portion 238 of the Führungshül 114 formed se. From this outer surface 240 of the jacket-like wall region 238 , the disk-shaped cam plates 120 b, 120 c, 120 d, 120 e, 120 f, 120 g also extend in the radial direction, which - as indicated by way of example by the reference symbol - may have recesses 123 . The thickness of these disks is preferably between 1 mm and 10 mm, and particularly preferably essentially 3 mm. But other dimensions are preferred.

The first 120a, second 120b, third 120c, and the fourth cam 120 d are of a first group 242 allocated and the fourth 120e, the fifth 120f, the sixth 120g and they bente cam 120 h of a second group net zugeord 244th

The cams 120 a, 120 b, 120 c, 120 d of the first group 242 are, in this order, axially offset and arranged adjacent to one another, with - in the design according to FIG. 12 - two adjacent cams 120 a, 120 b , 120 c; 120 d of the cam disks 120 a, 120 b, 120 c, 120 d of the first group 242 essentially abut one another in the axial direction.

The cams 120 e, 120 f, 120 g, 120 h of the second group 244 are, in this order, axially offset and arranged next to one another, with - in the design according to FIG. 12 - two adjacent cams 120 e, 120 f, 120 g, 120 h of the cam disks 120 e, 120 f, 120 g, 120 h of the second group 244 essentially abut one another in the axial direction.

The first group 242 is arranged at a distance from the second group 244 in the axial direction.

The first group 242 is arranged substantially in the end portion 246 of the guide sleeve 114, which cut the fourth Wandungsab 220 of the first housing part facing 104, while the second group 244 in sections substantially in the fourth Wandungs 220 of the first housing part 104 Endbe remote rich 248 the guide sleeve 114 is arranged.

The cam disks 120 a, 120 b, 120 c, 120 d of the first group 242 interact with the cam disk guides 122 a, 122 b, 122 c, 122 d associated therewith in such a way that in each case the position of the rotary insert 110 in the circumferential direction is defined clearly and repeatably at any angle of rotation.

In a corresponding manner, the cam disks 120 e, 120 f, 120 g, 120 h of the second group 244 interact with the cam disk guides 122 e, 122 f, 122 g, 122 h assigned to them.

It should be noted that instead of the two groups 242 , 244 , one group or more than two groups can also be given. Furthermore, the number of a group associated curves discs are differently chosen to which a clearly set at each rotation angle of the rotary insert 110 a position substantially. For example, three cams can be provided with correspondingly assigned cam guides. It is further preferred that adjacent cams of a group are - at least partially - axially spaced apart from one another. Furthermore, the order of the cure venscheiben can be designed differently in the axial direction.

In a preferred embodiment , the cam disks assigned to the same group 242 , 244 differ in size.

Preferably, the cam disks 120 a, 120 b, 120 c, 120 d assigned to the first group 242 are arranged mirror-symmetrically to the cam disks 120 e, 120 f, 120 g, 120 h assigned to the second group 244 , with respect to a plane of symmetry that is aligned perpendicular to the longitudinal axis of the rotary insert 110 . If necessary, the entire rotary insert 110 is designed mirror-symmetrically with respect to this plane of symmetry.

The inner contour of the guide sleeve 114 is non-rotationally symmetrical, in particular elliptical, and preferably adapted to the outer contour of the pin 116 , which has an elliptical cross-sectional area perpendicular to its longitudinal axis.

The cap 102 can be releasably connected to the first housing part 104 . The design of the cap 102 is cylindrical in the vorlie application example. The cap 102 can - ge facing away from the housing - be designed closed and catch chips that arise during the tip.

FIG. 13 shows the sharpener 100 from the perspective of line 13-13 in FIG. 12.

Fig. 13 illustrates the elliptical design of the housing sleeve le 160 , which delimits an elliptical interior 106 a. Furthermore, the cylindrical configuration of the cap 102 can be seen in FIG. 13. B extending through the wall portion 220 provided in the fourth slot 112 into the interior 221 extending knife edge 112 which is releasably secured by a screw 111 on the fourth wall section 220 includes a cutting edge 112 on a.

Fig. 13 also illustrates the elliptical design of the opening section 104 a facing the second housing part 106 of the through opening 218 and the circular design of the opening cross section 104 b facing away from the second housing part 106 of this through opening 218 .

FIG. 14 shows the sharpener 100 from the view of line 14-14 in FIG. 12.

The housing insert 108 is inserted into the housing shell 160 with a slight interference fit, the two parts of this housing insert 108 being supported on one another by straps 250 , 252 , 254 , 256 extending in the circumferential direction.

Fig. 14 also shows the first cam guide 122 and a second cam guide 122 a. The first guide surface 258 a of the first cam guide 122 a and the second guide surface 258 b of the second cam guide 122 b are each flat and axially offset from one another and arranged parallel to one another.

The first cam 120 a contacts in at least one rotational position, as shown in FIG. 14, the first cam guide 122 a. Preferably, the first cam disc 120 a contacts the first cam guide 122 a in each rotational position.

FIG. 15 shows a view along the line 15-15 in FIG. 12.

The rotational position of the rotary insert 110 corresponds in the Dar position according to FIG. 15 to that shown in FIG. 14.

The sectional view of FIG. 15 is compared with the offset axially from FIG. 14.

As can be seen from the regions 260 and 262 in FIG. 15, in the axial position shown there, the parts 264 , 266 of the housing insert 108 are objected to in the circumferential direction.

The second, elliptical cam 120 b is in at least one rotational position, in particular in all rotary positions, on the second cam guide 122 b.

The first 120a and the second cam plate 120 are disposed b zueinan of such that their respective major Hauptach sen stand 124 a and 124 b perpendicular to each other.

Further, FIG. 15, the third and fourth curves 122c washer guide 122 d, each extending as a kind of intermediate wall from the outer wall 268 of the housing insert 108 inwards, in particular perpendicular to Längsach se 118th

The third guide surface 258 c of the third cam guide 122 c and the fourth guide surface 258 d of the fourth cam guide 122 d are each flat and axially offset from one another and arranged parallel to one another.

The third 258c and the fourth guide surface 258 are d fer ner perpendicular to the first 258a and the second surface 258 disposed Führungsflä b.

On the third cam guide 122 c, the third cam disk 120 c is at least in one rotational position, in particular in all rotational positions. The circumferential surface of the third cure disc has two curved regions which abut each other with their respective ends, so that two substantially tapered transition regions 270 , 272 are formed between the curved regions. These tips 270 , 272 lie opposite each other and are rotated counterclockwise by approximately 45 degrees with respect to the large main axis 124 a of the first cam plate 120 a and by approximately 45 degrees with respect to the large main axis 124 d of the second cam plate 120 b. The third cam plate 120 c is designed such that the curvature 123 a extending to the main axis 124 b of the second cam plate 120 b is somewhat rounder than the curvature 123 b which runs in the opposite direction. Furthermore, the third cam 120 c is point-symmetrical in the view plane perpendicular to the longitudinal axis 118 .

FIG. 16 shows a view along line 16-16 in FIG. 12.

In FIG. 16, the entire rotating insert 108 is rotated 90 degrees with respect to the position in FIGS. 14 and 15.

The fourth cam 120 d lies at least in one rotational position, in particular in all, on the fourth cam guide 122 d. The fourth cam 120 d is mirror-symmetrical to the third cam 120 c with respect to the major axis 124 b of the second cam 120 b.

FIG. 17 shows a view along line 17-17 in FIG. 12.

The third cam 120 c is asymmetrical. The sections 125 a to 125 d of the cam guides 120 a to 120 h of the cam guides 122 a to 122 h are essentially flat.

Through the cooperation of the cam disks 120 a to 120 d with the cam disk guides 122 a to 122 d, the guide sleeve 114 is held in every rotational position such that the tip of a pin received in the guide sleeve 114 is guided along the cutting edge 112 a.

Here, the terms left, right, below and above should be understood as follows: In the sectional plane perpendicular to the central longitudinal axis 119 , directions above and below are to be understood, which extend in a first direction. Under left and right are to be understood directional information that first in a second direction perpendicular to the first direction. The position of the knife edge 112 is defined as above. The first cam guide 122 a prevents contact with the first cam 120 a that the rotary insert 110 evades upwards. As Fig. 15 shows, the second cam plate 120 b axially venscheibe adjacent to the first course 120 a is a guide to show up; that is, it prevents the rotary insert 110 from moving downward. Fig. 16 shows the third cam plate 120 c and the cam plate guide 122 c. It is prevented that the rotary insert 110 dodges to the left or ensures that the rotary insert 110 is guided to the right. Fig. 17 shows the fourth cam 120 d and the fourth cam guide 122 d, which in their interaction enable a guide to the right. Seen from the first housing part 104 , in the rear part of the sharpener there is a corresponding arrangement of four cam disks 120 a to h and their four cam disk guides 122 g and 122 h (two cam disk guides cannot be seen), which ensures an even smoother running becomes; tilting in particular is prevented. The total of eight cams 120 a to 120 h and eight cam disk guides 122 a to 122 h thus enable the rotary insert 110 to move up and down when turning in the direction of arrow 150 and to the right and left in arrow direction 152 ( FIG. 17) , so that the pin rests on the cutting edge in every rotational angle position. The position of the rotary insert 110 is clearly defined by each angle of rotation.

In a preferred embodiment, the rotary insert 108 can move axially with the housing 103 opened only in a limited number of rotary positions, in particular for assembly. This can be one or two or three or four or more rotational positions, for example. In the remaining rotary positions, stops act in the axial direction, in particular in both orientations of the axial direction.

The stops can be designed, for example, in such a way that alternating, if necessary, cams in the axial direction to adjacent cam disk guides under axial load attacks.  

reference numeral

1

sharpener

10

casing

10

a cylindrical cavity of the housing

10

10

b Annular plate

10

c rejuvenation

10

d inner cylindrical space

10

e threaded holes
was approach of the circular disc-shaped part

10

b

11

screw

12

knife edge

12

b cutting edge

12

c Tip of the knife edge

13

housing cover

13

a screw

13

b hole

12

knife edge

14

holder

14

a tubular approach

14

b disc-like part

16

pen

18

longitudinal axis

20

cam

22

first face

24

second face

26

first groove

28

second groove

30

first pen

32

second pen

34

sealing washer

36

container

40

clearance angle

50

Direction of movement up and down

52

Direction of movement back and forth

60

cover

62

outer wall

64

first intermediate part

66

second intermediate part

68

plan area of

64

70

plan area of

66

72

longitudinal axis

74

channel

76

flange

78

flange

80

outer area of

84

82

outer area of

86

84

Plate by

64

86

Plate by

66

88

outer surface

90

outer surface

92

face

94

Opening in

84

96

Opening in

86

98

Approach of

84

100

cylindrical part of

98

102

conical part of

98

104

Opening in

102

106

Through opening

108

flange

110

array element

112

End of

110

.

114

disc

116

flange

118

Through opening

120

Front of

114

122

tubular neck

124

opening

100

sharpener

102

cap

103

casing

104

first housing part

104

a rear elliptical opening of the first housing part

106

second housing part

106

a inner elliptical space

108

housing insert

110

Rotator

111

screw

112

knife edge

112

a cutting edge

114

guide sleeve

114

a inner elliptical space of the guide sleeve

114

b outer surface of the guide sleeve

116

pen

118

longitudinal axis

119

central longitudinal axis

120

a first cam

120

b second cam

120

c third cam

120

d fourth cam

120

e fifth cam

120

f sixth cam

120

g seventh cam

120

h eighth cam

122

a first cam guide

122

b second cam guide

122

c third cam guide

122

d fourth cam guide

122

e fifth cam guide

122

f sixth cam guide

122

g seventh cam guide

122

h eighth cam guide

123

a Clockwise curve of the curve of the third cam from the tip

123

b Course of the curve line of the third cam disc counter-clockwise away from the tip

124

a major major axis of

120

a

124

b major major axis of

120

b

125

a first section of the cam disk guide facing the cam disk

125

b second section of the cam disk guide facing the cam disk

125

c third section of the cam guide facing the cam

125

d fourth section of the cam guide facing the cam

150

Direction of movement up and down

152

Direction of movement to the left and right

160

Metal case

200

External surface of wall section

202

202

first wall section of

104

204

Inner surface of

106

206

Inner surface of

202

208

second wall section of

104

210

Inner surface of

208

212

third wall section of

104

214

head Start

216

radially inner end of

212

218

Through opening in

212

220

fourth wall section of

104

221

Interior of

220

222

Top of

116

224

side cover wall from

106

226

Through opening in

224

228

housing interior

230

fifth wall section

232

sixth wall section

234

Interior surfaces of

230

236

Interior surfaces of

232

238

jacket-like wall area of

114

240

Outer surface of

238

242

first group

244

second group

246

End range of

114

248

End range of

114

250

Tab of

108

252

Tab of

108

254

Tab of

108

256

Tab of

108

258

a first guide surface of

122

a

258

b first guide surface of

122

b

258

c first guide surface of

122

c

258

d first guide surface of

122

d

260

Area

262

Area

264

part of

108

266

part of

108

268

Outer wall of

108

270

pointed transition area

272

pointed transition area

Claims (29)

1. Sharpener for pens ( 16 ), in particular for pens ( 16 ) with a rotationally asymmetrical lead or for pens ( 16 ), the lead of which is arranged within a mine carrier, the cross-sectional area of which is perpendicular to the longitudinal axis and is non-hexagonal and non- is circular, with
at least one housing ( 10 );
a cutter connected to this housing;
a holding device for the pin ( 16 ) which is at least partially accommodated in the housing; and
a positive guidance device which guides the holding device along a predetermined movement path in this housing. 2. Sharpener according to claim 1, characterized in that this positive guidance at least one guide element and we at least has a guideway in which this guide engaging element. 3. Pencil sharpener according to claim 2, characterized in that the Guide element is a guide pin. 4. Sharpener according to one of the preceding claims, characterized characterized in that the guideway is a groove.   5. Sharpener according to one of the preceding claims, characterized in that the shape of the guideway in wesentli Chen the outer contour of the cross-sectional area of the sectional area is equal, which generates the cutting device on the pin ( 16 ). 6. Sharpener according to one of the preceding claims, characterized by a guide disk which extends radially outward from the holding device and has at least a least a groove for receiving a guide element, which is fixedly arranged relative to the housing ( 10 ). 7. Pencil sharpener according to one of the preceding claims, characterized in that the cutting device is fixedly arranged relative to the housing ( 10 ). 8. Sharpener according to one of the preceding claims, characterized in that the pin ( 16 ) is rotatably received in the holding device relative to this holding device and the holding device is arranged movably with respect to the cutting device. 9. Sharpener according to one of the preceding claims, characterized in that the pin ( 16 ) in the holding device in the direction of the longitudinal axis of the pin is taken up axially. 10. Sharpener according to one of the preceding claims, characterized in that the pin ( 16 ) is guided relative to the cutting device by means of the positive guide device during sharpening such that the clearance angle is between 2 ° and 10 °. 11. Sharpener according to one of the preceding claims, characterized in that the clearance angle at the tip of the pin ( 16 ) is substantially constant. 12. Sharpener according to one of the preceding claims, characterized characterized by at least one sealing device for Ab sealing the guideways. 13. Pencil sharpener according to one of the preceding claims, characterized in that the pencil sharpener ( 1 ) is at least partially made of plastic. 14. Sharpener according to one of the preceding claims, characterized is characterized by at least one container for receiving Chips. 15. Sharpener according to one of the preceding claims, characterized characterized in that by means of this sharpener non-rota tion-symmetrical cut surfaces can be generated. 16. Sharpener according to one of the preceding claims, characterized characterized in that the guide disc between two Flat surfaces is performed, these flat surfaces being a loading Prevent movement of the guide disc in the axial direction. 17. Sharpener according to one of the preceding claims, characterized by a covering device ( 114 ) for at least partially covering an opening in the housing ( 10 ) through which the pin ( 16 ) can be inserted into the interior of the housing, this cover being spring-loaded on Housing ( 10 ) abuts. 18. Sharpener according to one of the preceding claims, characterized in that a rotary insert ( 110 ) is at least partially in a housing ( 106 ) and moves there on a predetermined path when rotated about the longitudinal axis. 19. Sharpener according to one of the preceding claims, characterized in that the rotary insert ( 110 ) has a guide sleeve ( 114 ) in which a pin ( 116 ) can move axially, with a rotation of the pin ( 116 ) around it Longitudinal axis ( 118 ) causes the rotating insert ( 110 ) to rotate with the guide sleeve ( 114 ). 20. Sharpener according to one of the preceding claims, characterized in that the rotary insert ( 110 ) has a guide sleeve ( 114 ) and discs firmly connected to it ( 120 a, 120 b, 120 c, 120 d, 120 e, 120 f , 120 g, 120 h). 21. Sharpener according to one of the preceding claims, characterized in that the rotary insert ( 110 ) has at least three cams. 22. Sharpener according to one of the preceding claims, characterized in that in the interior ( 106 a) of the housing ( 103 ) cam guides ( 122 a, 122 b, 122 c, 122 d, 122 e, 122 f, 122 g, 122 h) are provided, which interact with the cams (120a, 120b, 120c, 120d, 120e, 120f, 120g 120h). 23. Sharpener according to one of the preceding claims, characterized in that at least one of the cam disk guides ( 122 a, 122 b, 122 c, 122 d, 122 e, 122 f, 122 g, 122 h) one of the cam disks ( 120 a ) to ( 120 h) facing section ( 125 a, 125 b, 125 c, 125 d), which extends essentially straight or flat. 24. Sharpener according to one of the preceding claims, characterized in that at least one of the cams ben ( 120 a) to ( 120 h) is formed by part of the outer surface ( 114 b) of the guide sleeve ( 114 ). 25. Sharpener according to one of the preceding claims, characterized in that the cams ( 120 a) to ( 120 h) are elliptical or asymmetrical. 26. Sharpener according to one of the preceding claims, characterized in that at least three cams ben ( 120 a) to ( 120 h) and cam guides ( 122 a) to ( 122 h) face each other and at each rotation angle the position of the rotary insert ( 110 ) essentially define clearly. 27. Sharpener according to one of the preceding claims, characterized in that the rotary insert ( 110 ) at least two groups ( 242 , 244 ) of cams ( 120 a, 120 b, 120 c, 120 d; 120 e, 120 f, 120 g , 120 h), which have an axial distance from one another. 28. Sharpener according to one of the preceding claims, characterized in that the rotary insert ( 110 ) is axially displaceable at a maximum of three positions in the housing, the position being defined by an angular range which is preferably less than 10 degrees, or preferably less than 5 degrees , or preferably less than 3 degrees, or preferably less than 2 degrees or preferably less than 1 degree. 29. Sharpener according to one of the preceding claims, characterized in that the pen tip bears upon rotation about the longitudinal axis ( 118 ) at every rotary position on the cutting edge ( 112 a) of the knife cutting de ( 112 ).