EP2683271A1 - Procédé et dispositif pour la fabrication de brosses - Google Patents
Procédé et dispositif pour la fabrication de brossesInfo
- Publication number
- EP2683271A1 EP2683271A1 EP11767928.2A EP11767928A EP2683271A1 EP 2683271 A1 EP2683271 A1 EP 2683271A1 EP 11767928 A EP11767928 A EP 11767928A EP 2683271 A1 EP2683271 A1 EP 2683271A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- base part
- tufts
- bristle tufts
- bristle
- opening
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000001746 injection moulding Methods 0.000 claims description 26
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000002991 molded plastic Substances 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 abstract 1
- 230000032258 transport Effects 0.000 description 30
- 238000005520 cutting process Methods 0.000 description 18
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000004026 adhesive bonding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 description 3
- 241000904500 Oxyspora paniculata Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009732 tufting Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D3/00—Preparing, i.e. Manufacturing brush bodies
- A46D3/04—Machines for inserting or fixing bristles in bodies
- A46D3/045—Machines for inserting or fixing bristles in bodies for fixing bristles by fusing or gluing to a body
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D1/00—Bristles; Selection of materials for bristles
- A46D1/08—Preparing uniform tufts of bristles
Definitions
- the invention relates to a method and an apparatus for producing brushes.
- Various methods of making brushes are known.
- a brush body is provided with an array of holes ("hole pattern") corresponding to the desired arrangement of bristles.
- Bundles or tufts of bristles are then inserted into the holes of the brush body and anchored therein by means of impressed small metallic anchors or by means of loops.
- the bristle tufts are attached to a small brush head plate without the use of loops or anchors. and the carrier plate is then inserted into or attached to a brush body or handle.
- brush handles are made with a hole pattern that corresponds to the desired tuft pattern. Bristle tufts are then inserted into these holes and attached to the brush handles. The attachment ends of the tufts are then covered with a small plate.
- the present invention relates to a method and apparatus for making brushes based on this AFT method.
- the invention provides a method and a device that are simple and above all very fast and low maintenance.
- the method according to the invention is used in particular for the production of toothbrushes and provides the following steps: sequentially removing bristle tufts from a bristle supply in which the bristles are housed packed in parallel,
- a guide plate is provided with Umlenkkanälen, are pushed through the bristle tufts in the opening in the base part, and anchor-free fastening of the bristle tufts on the base part.
- tufts of bristle stock are removed in succession, that is to say sequentially, and transported to form a base part.
- This base part may be either a kind of plate, which is then connected to the brush body, or be a portion of the brush body itself.
- the front side of the base part is the side from which the bristles of the later brush protrude, whereas the back side is the usually closed, that is bristle-free, side.
- a guide plate is provided between the transport means and the back side of the base part which has deflection channels through which bristle tufts are pushed into the opening in the base part.
- the deflection channels and the openings can run obliquely and the tufts are anchored obliquely in the base part and / or several toward one another to a common opening in the base part to running channels are provided (which here, for example, a running in the direction of insertion channel with an obliquely extending deflection of a common opening in the base part can be assigned), so that a plurality of tufts are pushed into different, juxtaposed channels and via these in a common opening in the base part to form a common tuft and / or at least one deflection channel is provided which receives a plurality of tufts to to unite them into a common tuft, this deflection channel preferably has a plurality of adjacent inlets, from which unite the individual channels to a common deflection channel, and / or that at least one deflection channel has an inlet whose geometry is different from that of Ausla sses the deflection channel is different.
- the outlet of the deflection channel usually has the same geometry and size as the adjacent opening in the base part.
- One embodiment provides for the guide plate to be placed on the rear side of the base part and removed from the base part before it is fastened to the base part.
- the position of the base part is aligned with the stationary tool for pushing for each hole to be filled and thus moved.
- One possibility for this is to move the base part for the sequential piercing at least in two directions, in order to align the opening to be filled with the bristle tufts to be inserted. This method is, as immediately apparent, very easily adaptable to completely new tufts.
- the method can be adapted very quickly to new patterns if the base part is moved using a freely programmable, at least 2-axis positioning device, in particular a freely programmable, preferably 2-axis industrial robot.
- the bristle tufts are transported sequentially by a tuft picker to the final position, from which they are pushed axially into the opening to be filled.
- a tuft picker For the separation of the bristle tufts as well as for the transport, only one movement is required, which can be, for example, a circular arc movement or a linear movement of the tufts collector.
- the tuft picker does not necessarily have to move back and forth between the pickup position and the dispensing position. It would also be conceivable to provide a ring or circular tuft picker which rotates permanently in one direction.
- the bristles used are made of plastic.
- the back stuffing of the bristle tufts has the advantage that the tufts protrude so far from the base part as far as possible, thanks to a usually front stop, as desired, regardless of the length tolerances of the individual bristles.
- the bristle tufts is not clamped radially.
- clamping namely, the tuft end could widen in the gap, which would make it difficult to insert into the openings.
- Such a radial clamping force will occur in particular in so-called tenter.
- the base part usually has a small thickness and the length of the openings over which the tufts are held, also correspondingly low, provides an advantageous method step, that a guide member is positioned on the device side with through holes before inserting the tufts on the front of the base part ,
- the bristle tufts are inserted through the openings in the through holes in the guide part.
- the tufts protrude on the front even out of the guide part.
- the front-side guide member may be formed as a clamper for the tufts, for example, in that the through-holes have a cross-section sufficiently large in relation to the tufts inserted therein that the tuft or temples are press-fitted in the through-holes. Clamping the tufts prevents the tufts from being pulled out when the back guide plate is removed rearwardly from the base.
- the front ends of the tufts may contact a profiled pressure member during or after loading of the base member to provide a profiled brushing surface.
- the brush surface is the front side working surface of the brush formed by the bristle ends.
- This pressure part can either already be present during the plug and serve as a stop or pressed against the bristles after the plug, so that they rest against the pressure part and image the shape of the pressure part.
- the bristle tufts protruding from the back of the openings of the base part after the impact cut off.
- the tolerances of the individual bristle lengths are thereby fully compensated, because on the front can be done on the printing part a precise length adjustment, the back is then simply cut off.
- This cutting can be done by cutting tools or a heated tool, especially a so-called hot knife. There is a contact between the hot tool and the individual tufts, the life of the cutting tool is very high.
- the bristle tufts are attached on the back, for example by thermal fusion and / or gluing and / or embedding in a molded plastic compound. Of course, these attachment methods can also be combined with each other arbitrarily.
- the bristles stuffed into the base part are preferably pre-rounded or preprocessed in advance.
- the tufts are held radially only from the base part and, if present, the guide part. At the two ends no lateral fixation is provided, the ends are only frontally on the device and are thus fixed axially.
- the back of the bristle tufts and the base part is covered.
- This can be done, for example, that the brush body has a recess in the region of the back tuft ends, which is closed by a prefabricated or molded lid part.
- Another possibility of covering the bristle tufts on the back is to form a prefabricated cover part on its side facing the base part with molded-on projections, so-called sacrificial structures, which soften during the subsequent heating, in particular become liquid, in order then to strike against the base part or, more generally to be pressed against the brush body.
- the brush body can also be provided with such sacrificial structures in order, after its heating, to be connected to the possibly also heated base part.
- This lid part can be with protruding Cleaning projections in any form to be used as a tongue cleaner or the like.
- the base part is overmolded. If the base part is not already on the brush body at the same time, but rather a part to be fastened to the remainder of the brush body, the base part can be overmolded during production of the brush body.
- the encapsulation of the base part is not limited to this variant.
- a particularly advantageous embodiment of the invention provides that the bristle tufts are attached to the back anchorless, in particular by fusing and / or gluing and that the assembled base is then inserted from a Beborstungsstation in a cavity of a mold half of an injection mold and thereby with its edge on the edge of a from the associated cavity outgoing opening rests and the bristle tufts protrude into the opening.
- a brush section is molded onto the base part, which covers the bristle tufts.
- the bristle ends of the bristle tufts were first fused together, which was usually done in the hole plate equipped with the bristle tufts and produced in a complex manner. Subsequently, this perforated plate was transported in an injection mold to overmold the tufts.
- the bristled base part was always transported in the prior art, including the support plate in an injection molding tool or another station of an injection molding tool.
- the carrier plate served to support against the injection pressure during injection molding of the brush body (head and stem).
- the present invention provides that these provided with the hole pattern of the brush carrier plates when making the brush body no longer provide as support plates in the injection mold.
- an opening in the region of the cavity to be ejected is provided in a mold half of the injection molding tool, into which the plurality Protruding bristle tufts.
- the base part is located exclusively or almost exclusively only with its peripheral edge on the edge of the cavity extending from the opening and is preferably supported only at this edge. The base part is held on the edge in the cavity.
- the base part lies with its edge closed circumferentially on the likewise closed circumferential edge of the opening, so that a sealing effect is achieved.
- the entire production and the entire apparatus can manage with significantly less perforated plates.
- a plurality of cavities are provided in the mold half of the device according to the invention in order to increase the discharge rate of the entire device.
- the mold half with the at least one cavity can also, and this is preferably formed in several parts.
- a first and a second molded part if appropriate also further molded parts with in particular a plurality of juxtaposed cavities or rows of cavities, can be used.
- the cavity associated with a brush is then divided into several sections, for example into a section in the first and into a section in the second shaped part. These cavities merge into one another and form the total cavity of the mold half.
- the first molded part is separable from the second molded part and may be used as a means of transport or ejection tool for the one or more seated in it base parts.
- the first molded part can first be fitted with the bristled base parts, independently of the second molded part, and only then coupled to the second molded part, namely immediately before injection molding.
- the first molded part is very easy to produce due to the lack of hole pattern, many first molded parts can be manufactured and used relatively inexpensively, which significantly improves the cycle time and flexibility of the entire device.
- the so-called brush body could be injected in the injection molding tool, which can be designed in one or more parts.
- This brush body is usually the brush handle, the brush neck and a part of the brush head.
- the other part of the brush head is formed by the base part.
- the base part itself already has almost the entire head and essentially the entire handle or stem of the brush.
- this base part also forms a brush section and is then bristled and then overmoulded, at least in the back of the head or in the style area.
- elastomeric profile parts which have any cross-sectional shapes, can be injected or injected or fastened in openings. These profile parts are not bristles, but different profile parts with smaller or larger cross-sectional area than the usual bristles.
- the parts can also have a cross-sectional shape deviating from the circular shape. In particular, such profile parts are used to produce a gum massaging effect.
- the aforementioned other way to close the tuft-free openings is in the back molding of plastic.
- either only the tuft-free openings can be closed, or it can front side projecting profile parts are molded with simultaneously.
- the front-side guide part can serve as an injection mold.
- the bristle tufts are separated from the bristle supply to the side of the bristle longitudinal direction and, in particular, moved individually to the openings via the transport device.
- no transport tubes known in the prior art are used for the transport device, which dip into the supply in the longitudinal direction of the bristles and receive and clamp a tuft of bristles.
- high cycle times can be realized by the lateral removal, and on the other hand, the tufts are significantly less or not compressed at all, which improves their positioning when entering the openings.
- the method according to the invention is also used in particular in connection with brushes in which, in addition to the bristle tufts, at least one flexible element, preferably of TPE, projects from the brush head and is injection-molded onto the brush head.
- These soft-elastic elements may be positioned at the edge of the brush head and protrude or lie in the bristle field, i. be surrounded by bristle tufts.
- These soft-elastic elements have e.g. the function of achieving a gum massage when brushing your teeth.
- the soft elastic element is e.g. integral with a flexible section on the handle-to-head connection and / or even into the handle, so that bending elasticity or non-slip feel is achieved in these sections.
- the invention moreover also provides a device for producing brushes, in particular a so-called brush-making machine, which preferably uses the aforementioned method according to the invention.
- the apparatus comprises a magazine having a bristle stock in which bristles are packed in parallel, a bristle tuft picking unit sequentially picking bristle tufts from the bristle stock laterally to their longitudinal extent, transporting the individual bristle tufts to a stuffing station, the stuffing station comprising a holder for to be installed base parts of the brush, a guide plate between the transport device and the back of the supplied base part with deflection channels through which tufts of bristles are pushed into the opening in the base part, and means by which the tufts of bristles are pushed sequentially from the rear side through the guide plate into the base part.
- the variants of the embodiment of deflection channels described above can of course also be implemented in the device according to the invention, individually or in any desired combination.
- the device comprises a closed-loop receiving device, for example a receiving table, a chain, an index table or, more generally, a type of circle with receptacles for the base parts on which they are moved, to individual stations, e.g. to cut through the bristle tufts and attachment of the tufts and optionally closing the back of the open brush body or molding of the brush body.
- the removal device is integrated into the transport device.
- the transport device moves the tufts along a linear or curved path to the stuffing station.
- Such so-called tufts are shown in EP 0 972 465 B1.
- the device according to the invention preferably further comprises a tuft picker, which transports the tufts sequentially to the final position, from which they are pushed axially into the opening to be filled. A transfer after the separation of the bristle tufts on another device or a carrier that brings the tufts up to the position immediately before the impact, thus eliminating.
- the device according to the invention also comprises a station in which the base part for the sequential piercing is moved at least in two directions in order to align the opening to be filled with the bristle tufts to be filled, this station in particular having a freely programmable, preferably 2-axis industrial robot Has shift of the base part.
- the preferred embodiment provides for integrating a cutting device into the device with which the bristles protruding from the base part on the rear side are cut off.
- the cutting device is moved transversely to the bristles without any support.
- the bristles are cut off at the back by acting as a counter knife a device-side support plate through which the tufts protrude. This plate stabilizes the tufts and on the surface of the plate a knife is driven along, which cuts off the tufts.
- this type of cut is reliable, but leads to wear of the cutting device and is therefore maintenance and spare part intensive than the device according to the invention, in which no support plate is provided on the tool.
- this support-free cutting is preferably easy to implement by a heatable tool in which the hot tool contacts the bristles and cuts.
- the heatable tool is in particular formed with a current-carrying heating wire, which may be a round wire or a flat wire, wherein in experiments with the flat wire very good results have been achieved.
- the bristles are welded together in tufts or in total and / or glued and / or potted.
- FIGS. 1a to 1h show successive steps of the method according to the invention which are carried out in the device according to the invention
- FIG. 2 shows a schematic plan view of a station of the device according to the invention, in which bristle tufts are taken from a magazine,
- FIG. 3 shows a perspective view of the station according to FIG. 2 with some parts omitted
- FIG. 4 shows an enlarged detail view of FIG. 3
- FIG. 6 shows a schematic perspective view of another station of the device according to the invention, in which bristles are cut
- FIG. 7 shows a detail sectional view through the station of FIG. 6,
- FIGS. 8a to 8c show successive steps in the station according to FIG. 6 with another blade
- FIG. 9 shows a schematic top view of a device according to the invention
- FIG. 10 shows a perspective view of an injection molding tool as part of the device according to the invention.
- FIG. 11 shows a plan view of a molded part of the injection molding tool according to FIG. 10,
- FIG. 12 shows a plan view of bristled base parts, which are inserted into the molded part according to FIG. 11,
- FIG. 13 shows a bottom view of the molded part according to FIG. 12, which is provided with base parts
- FIG. 14 shows an alternative embodiment to FIG. 11, in which supporting projections additionally project into the opening of the molded part
- FIG. 15 shows a perspective plan view of a still unbebonded toothbrush according to a further embodiment, which has a soft-elastic element
- FIG. 16 shows a perspective rear view of the toothbrush of FIG. 15, in a bristled state
- FIG. 17 shows a perspective rear view of a variant slightly modified in comparison with the toothbrush according to FIG. 16, and FIG. 18 shows a modified device according to the invention.
- FIG. 1 shows several successive steps for producing brushes, here in the form of toothbrushes.
- the brush has a brush body 10 with a brush head, which in the following forms a base part 12.
- the base part 12 has numerous passage openings 14, which are filled with bristle tufts 16, which are fastened to the base part 12.
- a transport device 18 conveys individual bristle tufts 16, which are pushed by a device from the transport device 18 into the openings 14 from the rear side of the base part 12.
- the transport device 18 has a receiving opening 22 which is filled with a bristle tuft 16 and moved to the base part 12.
- the device 20 comprises a linearly movable plunger 24 which is inserted axially into the receiving opening 22 in order to push the bristle tufts 16 into the opening 14 of the base part 12 which is aligned with the receiving opening 22.
- the base part is moved along two axes and aligned with the opening to be filled 14 on the bristle tufts 16 to be introduced.
- the guide plate 17 On the back of the base part 12 is a guide plate 17, on which in turn the transport device 18 rests.
- the guide plate 17 is part of the corresponding Stopfstation and is automatically placed after supplying a toopfopfenden base member 12 on this.
- the guide plate has numerous channels, which on the rear side (facing the transport device 18) each have an inlet and on the front side (to the base part 12) have an outlet. Many of the channels are aligned exactly in the insertion direction (direction of movement of the plunger 24). However, some channels are designed as deflection channels 19, which move the tufts inserted into them transversely to the direction of insertion. Preferably, all inlets 21 have the same geometry and size, in particular a circular shape.
- deflecting channels 19 are shown, which extend obliquely to each other, two separate inlets 21 and two almost already merging outlets 23 have.
- the outlets 23 are associated with a common opening 14, and over the two mutually facing deflection channels 19 an oversized opening is equipped with two tufts, which then unite to form a common tuft.
- a channel oriented axially in the ejection direction can fill an oversized opening 14 in the base part 12 with an adjacent deflection channel 19 running obliquely toward it.
- the geometry of the oversized opening 14 is arbitrary, elongated openings or square or circular openings 14 may be provided as required. While in FIG. 1a, the openings 14 all extend in the ejection direction or parallel thereto, according to the enlarged detail, openings 14 also provided obliquely to the ejection direction can be provided, wherein the deflection channels 19 are aligned with them. These slanted apertures 14 allow the embedding of slanted tufts 16 in the base part 12.
- inlet and outlet 21 and 23, respectively have different geometries, e.g. For example, some outlets 23 have an oval or angular geometry, where the cross-sectional area may be the same as inlet 21.
- a device-side guide part 26 preferably in contact with the front side of the base part 12, is arranged, whose through-holes 28 are aligned with the openings 14 to be populated.
- a stop member 30 Spaced apart from the guide member 26 is a stop member 30.
- the bristle tufts 16 are so deep into the guide plate 17, the base member 12 and the guide member 26 from the back of the base member 12, that is, from the back of the brush 10, pushed that they front of the Guide member 16 protrude again and abut against the stop member 30.
- the guide plate 17 can be pulled off before reaching the state shown in Figure 1b or later again upwards.
- the guide member 26 may be formed as a clamping means for the tufts 16, for example by an additional, transversely to the insertion direction displaceable clamping piece, which pushes the tufts 16 laterally in their guides or by the through holes 28 in relation to the or in the tufts inserted into them have such a large cross-section that the tuft or tufts 16 are press fit into the through holes 28.
- the stop member 30 is removed. Instead, a pressure member 32 is moved from the front axially to the bristle tufts 16 upwards, so that it contacts all the bristle tufts 16. The top of the pressure member 32 is profiled to form a complementary brush surface (formed by the front ends of the bristle tufts 16).
- a counterpressure part 36 complementary to the pressure part can be provided on this rear side so that the bristle tufts 16 are axially between printing part 32 and counter-pressure member 36 may be fixed as free of play.
- one of the pressure parts 32, 36 either elastically or elastically mounted.
- the front ends of the bristle tufts 16 have an exact alignment with the base part 12.
- bristle tufts 16 are attached at the back. This attachment is done for example by welding.
- One way of welding is shown in Figure 1e, in which a hot plate 38 is pressed against the bristle tufts 16.
- the back ends of the thermoplastic bristles fuse together, preferably to form a continuous layer 40 (see FIG. 1f).
- the pressure part 32 preferably remains on the bristle tufts 16.
- the pressure part 32 can now be removed (FIG. 1 g), and subsequently a rear cover part 40 is applied to the rear side of the base part 12, at least in the region of one another welded ends of the bristle tufts 16, applied.
- This cover part 40 may be a prefabricated part.
- the lid member 40 may also be made by injection molding to the base member 12 or to the brush body.
- the aforementioned use of sacrificial structures on the lid or on the brush body can also be used.
- the guide member 26 it is preferable (not limiting) for the guide member 26 to be supported on the base member 12 to provide support and sealing.
- the guide member 26 it is preferable (not limiting) for the guide member 26 to be supported on the base member 12 to provide support and sealing.
- Figure 2 shows further details of a possible embodiment of the station of the device according to the invention, in which the bristle tufts 16 are separated and transported to the base part 12.
- the device has its own station with a magazine 42, in which a bristle supply 44 is housed.
- the bristles are aligned in magazine 42 parallel and ungrouped housed. They are pressed by adapted pressure means in the direction of the transport device 18.
- the transport device 18 includes in the present, also not limiting embodiment to be pivoted about a pivot axis 46 to be pivoted removal device 48 with a plate-shaped bundle pickup, in the illustrated embodiment, a so-called circular arc having a receiving opening 50 for a bristle tufts 16.
- the receiving opening 50 is open on the side facing the brush holder 44 side.
- the bundle pickup is pivoted to the right with reference to FIG. 2, the receiving opening 50 comes into contact with the bristle supply 44. Because of the prestressing of the bristle supply 44 in the direction of this receiving opening 50, so many bristles press into the receiving opening 50 that they are complete is filled.
- the separation of the bristle tufts 16 thus takes place laterally to the longitudinal extension of the bristles, which in the present case would be perpendicular to the plane of the drawing.
- the receiving opening 50 When the receiving opening 50 is filled with bristles, it is pivoted clockwise and moved to the position shown in Figure 2.
- a guide plate 52 which conforms to the shape of the plate 48, ensures that no bristles can fall out of the receiving opening 50.
- a linear method can also be used. From the transport device 18, the bristle tufts 16 are pushed directly into the base part 12 directly via the guide plate 17 without the interposition of a carrier plate or the like. It should be noted that the individual bristle tufts are sequentially removed from the magazine 42 and transported with the tuft picker to its final position before pushing. A transfer to subcarrier is avoided here.
- the base portion 12 has numerous openings 14 which must be successively filled with bristle tufts 16, the base portion 12 is moved in two directions X, Y. In order to be filled openings 14 are aligned with the receiving opening 50 and the next bristle tufts 16 to be injected.
- the corresponding station preferably has a so-called X-Y slide, on which the base parts 12 can be fastened and moved in one plane.
- a so-called XY carriage is a simple embodiment of a freely programmable, at least 2-axis positioning device, in particular a freely programmable 2-axis industrial robot.
- FIG. 3 shows the magazine 42 with the tuft supply 44 in perspective view. To clarify the entire station, several parts have been omitted, i.a. the guide plate 17.
- FIG. 3 further shows a bristle tuft 16, which is being pushed by the device 20 into an opening of the base part 12.
- a holder 54 positions and locks the guide member 26 to an alignment unit, such as an X-Y slide, over which alignment of the base member 12 with the receiving aperture 50 occurs.
- FIG. 4 shows that the bristle tufts 16 protrude from the guide part 26 after being pushed into the openings 14 of the base part 12. However, the bristle tufts 16 are also in front of the base part 12, either directly after the impact or after the start of the pressure part 32.
- the inlets 21 have the same cross-section as the receiving opening 50.
- a guide-free gap 60 can be present between the rear side of the guide plate 17 and the transport device 18 be (see Figure 4).
- it can possibly offer to make the inlets 21 slightly larger than the receiving opening 50, since the tuft 16 could spread slightly at its free end.
- the inlets 21 may generally be advantageous if the inlets 21 widen somewhat funnel-shaped toward the rear.
- the openings 14 are preferably provided on the back with a flared chamfer 62.
- the base part 12 has a depression 64 in the region of the openings 14 on the rear side. In this recess 64, the lid member 14 is introduced or molded.
- the transport device 18 is designed so that during the insertion of the bristles into the openings 14 in the transport device 18 exclusively axial pressure (that is, pressure in the bristle longitudinal direction) is exerted on the bristle tufts 16 to be introduced. That is, the wall around the receiving opening 50 is rigid, no radial clamping force is exerted on the bristles. The only clamping force is achieved by the bias in the bristle supply 44, which is forwarded so to speak in the receiving opening 50 when separating the bristles.
- FIG. 5 also shows a further variant of deflection channels.
- a plurality of deflection channels 19 and a centrally located thereto, aligned in the ejection direction channel are combined within the guide plate 17, to unite to a common deflection channel 19 'with a common outlet 23.
- the outlet 23 has an elongate shape to form a common, plate-shaped tuft 16.
- the outlet 23 preferably has a cross-sectional area which corresponds to X times the receiving opening 50, where X corresponds to the number of tufts 12 fed to the common opening 14.
- FIG. 6 shows an embodiment of such a heated tool 70, which comprises a current-carrying, hot wire. This wire is moved substantially parallel to the back of the base part 12, as close as possible to the base part 12 along and separates the protruding bristle ends. Bristles can also partly melt together.
- FIG. 7 shows the effects of heat on not yet cut bristle tufts 16, which fuse together.
- the already separated ends of remaining in the base part 12 bristle tufts 16 merge, which is advantageous for positioning and attachment.
- a cross-sectionally substantially circular wire is shown as a tool 70
- FIGS. 8a to 8c an alternative embodiment with a so-called flat wire can be seen.
- This also current-carrying, heated wire is placed like a knife obliquely to the bristles to be separated.
- the bristle tufts 16 are not laterally supported in the region of their interface.
- the tool 70 is not supported in the region of the base part 12, so that no wear occurs during cutting. The cutting takes place, so to speak, without support.
- the bristle tufts 16 are either held laterally only by the base part 12 (see FIGS. 8 a to 8 c) or by the base part 12 and the guide part 26. If, during cutting, the guide plate 17 should still be present, this contributes to the support. If cutting instead of cutting with a heated tool, the guide plate 17 could also be designed as a counter knife. In the axial direction, the bristle tufts 16 are positioned between the pressure part 32 and the counter-pressure part 36. This positioning should, but not in a limiting sense, be ensured even during cutting.
- the cutting is preferably carried out over the head, that is to say with the back side downwards (see, for example, FIG. 8).
- the severed ends 72 simply fall down.
- the fastening of the bristle tufts 16 on the base part 12 takes place, as stated, either by welding and / or by gluing and / or by casting, for example during the production of the cover part 40.
- the cover part 40 can in particular rear projecting cleaning projections 80 have to form a tongue cleaner.
- the supplied cover part 40 can be subsequently pressed or glued, even using the aforementioned sacrificial structures.
- openings 14 must be closed by a bristle tufts 16. It may, as already mentioned, even one or the other opening 14 remain unfilled. When later gluing or potting or injection molding, the corresponding opening 14 is then closed.
- FIG. 9 shows a device for producing the brushes according to the method described above. This device is designed as a tool, e.g. with a rotating table 100.
- each bristle tuft 16 is moved individually to the base part 12 (in this case the brush body 10) via the removal device 48 and the transport device 18, the brush body 10 being previously placed on the guide part 26.
- a magazine with empty guide parts 26 may be present and is not shown here for clarity.
- each individual bristle tuft 16 is stuffed into the associated opening 14 by moving the laterally held guide part 26 in the X and Y directions.
- the finished assembled base 12 is then moved to the tool table 100 and attached to this.
- the rotating tool table 100 transports one or more of the base parts 12 to a station in which, according to FIG. 1c, pressure and counter-pressure parts 32, 36 align the tufts. Thereafter, the tufts are cut off at the back by means of the tool 70. This cutting can take place in a subsequent station or in the station in which the pressure and counterpressure parts 32, 36 are applied for the first time.
- the bristle tufts 16 are fastened on the back, for example under the action of heat.
- lid part 40 is sprayed on.
- the finished brushes are removed and stacked, for example.
- the transport of the guide members 26 into the first station is not explicitly shown.
- FIGS. 10 to 13 show an injection molding tool which can be used as a further station in a device comprising several stations for producing brushes.
- the injection molding tool is shown stylized in FIG. 10 and comprises a multi-part lower mold half 140 and an upper mold half 142, which each have cavities which merge into one another in the closed state of the tool and form a cavity to be ejected.
- the lower mold half 140 comprises at least two parts, namely a first mold part 144, which is shown in more detail in FIGS. 11 and 13, and a second mold part 146.
- the mold parts 140, 142 comprise a plurality of cavities 156 arranged next to one another.
- the first molded part 144 has an opening 148 in the region of each cavity 46, which extends from the cavity 146 and which serves to receive the bristle tufts 16 of a base part 14.
- the rim 150 which is recessed and is part of the cavity 146, surrounds the respective opening 148.
- This edge 150 serves as a support and support surface for the bristled base part 12.
- the cavity 146 also has a neck portion 152 as a transition between the brush head and brush handle. As is shown in FIG. 10, this neck section 152 merges into the section 156 of the cavity in the second molding 146 which defines or receives the stem of the brush.
- only one opening 148 is provided for receiving all bristle tufts 16 of a base part 12. This makes the production of the first molding 144 particularly cost effective.
- the opening 148 is designed either as a complete passage opening or as a blind hole. In any case, it must be ensured that the opening 148 is deep enough so that the front ends of the bristle tufts 16 do not protrude from the opening and at an adjacent part such as the bottom of the recess 160 in the second mold part 146 or at the bottom of a blind hole-like opening queue. The bristle tufts 16 thus project freely downwards.
- the back not yet overmolded base parts 12 form according to the preferred embodiment of the head and stem of the brush. It is possible that in the head a bristled part is present, which is then encapsulated to form the stem. However, according to the preferred embodiment, the head and stem are integral, and the head has the openings 14 for receiving the bristle tufts 16.
- the bristled base part 12 is produced by the method steps according to FIGS. 1 a to 1 g and is released from the guide part 26 in a subsequent method step.
- the guide member 26 thus does not migrate together with the bristled base member 12 to the injection molding station.
- Either the bristled base member 12 is then transported by machine or by hand to the first mold part 144 and inserted there into the openings 148, or there is provided an intermediate storage between Beborstungsstation and injection molding in which bristled base members 12 are stored. After insertion into the injection-molded tool, the base part 12 lies in the cavities 146, 156. Subsequently, the upper mold half 142 is moved downwards in order to close the injection-molding tool.
- FIG. 12 also shows the back-side tufts 16 welded together.
- the base part 12 has the back of a trough-like depression, which is filled with closed injection molding tool by liquid plastic.
- the injected plastic closes the brush head on the back.
- portions of, for example, the stem may be overmolded or molded with a second component in this or in another method step.
- the base part 12 could consist only of the brush head or a part of the brush head, and the remaining partial areas would then be injection-molded in the injection molding tool
- the base part 12 is supported only at the edge of the opening 148.
- the bristle tufts 16 are not supported. This considerably simplifies the injection molding tool.
- the base part 12 lies with its edge closed circumferentially on the likewise closed circumferential edge 150 of the opening 148, so that a sealing effect is achieved.
- the first mold part 144 is removed with the brush body the injection mold and either transported to another injection molding station or fed as a finished brushes a camp.
- bridge-like support which extends between the bristle tufts 16 and the support is used.
- the opening 148 is sized so that all or at least several bristle tufts 16 protrude into the common or common opening.
- one or more soft elastic elements 180 for cleaning the teeth and for massage of the gums on the brush head are provided.
- these soft elastic protruding from the brush head elements 180 are not stuffed, but injected onto the base member 12, preferably before the plug.
- the one or more elements 180 extend forward next to the bristle tufts 16 and protrude from the base part 12.
- These soft-elastic elements 180 may be positioned at the edge of the brush head and may protrude or lie in the bristle field (see FIG. 15), i. be surrounded by bristle tufts 16.
- the brush body 10 is produced as a multi-component injection-molded part, in which a component, alone or in sections, forms the flexible element or elements 180.
- a component alone or in sections
- the material of the element 180 extends into the grip, where it forms a soft, grip-secure handle back.
- the soft material forms a larger portion and provides a kind of elastic joint.
- the variant according to FIG. 17 does not have a one-piece transition of the soft-elastic element 180 with the handle or the connection region 182.
- the sections formed here from the TFE material must therefore be sprayed via separate injection points.
- the back of the head is not yet shown closed.
- the head must be closed on its back, e.g. by injecting a further component or welding or gluing a lid.
- the soft-elastic elements are in particular of thermoplastic elastomer (TPE).
- the variant with the soft-elastic elements need not be limited to the manufacturing method and a device with the guide plate, as Figure 18 shows. It is also possible to manufacture these toothbrushes without the guide plate 17.
- the method is carried out without the guide plate 17 with deflection channels 19, in particular between the transport device 18 for feeding bristle tufts 16 and the openings in the base part 12, i. between the movable portion of the transport device 18 and the back of the base member 12, a guide-free gap 184 is provided, over which the bristle tufts 16 are inserted without guidance in the base part 12.
- the corresponding device according to the invention consequently does not provide a guide plate, but the other features mentioned previously and in the claims (individually or in combination).
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Brushes (AREA)
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011013621.5A DE102011013621B4 (de) | 2011-03-11 | 2011-03-11 | Verfahren und Vorrichtung zum Herstellen von Bürsten |
PCT/EP2011/004989 WO2012123004A1 (fr) | 2011-03-11 | 2011-10-06 | Procédé et dispositif pour la fabrication de brosses |
Publications (2)
Publication Number | Publication Date |
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EP2683271A1 true EP2683271A1 (fr) | 2014-01-15 |
EP2683271B1 EP2683271B1 (fr) | 2017-08-16 |
Family
ID=44789414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11767928.2A Active EP2683271B1 (fr) | 2011-03-11 | 2011-10-06 | Procédé et dispositif pour la fabrication de brosses |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2683271B1 (fr) |
CN (1) | CN103442616B (fr) |
DE (1) | DE102011013621B4 (fr) |
ES (1) | ES2647582T3 (fr) |
WO (1) | WO2012123004A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012008536B4 (de) | 2011-10-06 | 2023-06-15 | Gb Boucherie Nv | Verfahren zum Herstellen von Bürsten sowie Bürste |
DE102012010415B4 (de) | 2012-05-25 | 2023-06-15 | Gb Boucherie Nv | Verfahren zum Herstellen von Bürsten, Borstenträger sowie Bürste |
CN103876453A (zh) * | 2012-12-24 | 2014-06-25 | 王文林 | 弹性刷架更换刷头的牙刷及制造方法 |
EP3087864A1 (fr) * | 2015-04-29 | 2016-11-02 | M+C Schiffer GmbH | Procédé de production d'une brosse, en particulier brosse à dent et poignée associée |
DE102016107759A1 (de) * | 2015-07-13 | 2017-01-19 | Gb Boucherie Nv | Verfahren und Vorrichtung zum Herstellen einer Bürste |
EP3445205B1 (fr) | 2016-04-20 | 2022-02-09 | Trisa Holding AG | Produit de type brosse |
DE102019120756B3 (de) * | 2019-07-31 | 2020-11-12 | Gb Boucherie Nv | Borstenträger-Spannhalter |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3920769A1 (de) * | 1989-06-24 | 1991-01-10 | Fritz Rueb | Verfahren und vorrichtung zum herstellen von borstenfeldern oder borstenbuendeln |
DE4027288C2 (de) * | 1990-08-29 | 2001-08-09 | Coronet Werke Gmbh | Vorrichtung zur Erzeugung von Borstenbündeln und Verfahren zur Herstellung von Borstenwaren mittels der Vorrichtung |
ES2076604T3 (es) * | 1992-04-28 | 1995-11-01 | Boucherie Nv G B | Un metodo de producir cepillos de dientes. |
EP0972464B9 (fr) | 1998-07-14 | 2009-03-25 | Firma G.B. BOUCHERIE, naamloze vennootschap | Procédé de fabrication de brosses et machine de fabrication de brosses pour l'application de ce procédé |
BE1017018A3 (nl) * | 2006-02-02 | 2007-12-04 | Boucherie Nv G B | Werkwijze voor het vervaardigen van borstels. |
-
2011
- 2011-03-11 DE DE102011013621.5A patent/DE102011013621B4/de not_active Expired - Fee Related
- 2011-10-06 EP EP11767928.2A patent/EP2683271B1/fr active Active
- 2011-10-06 CN CN201180069189.4A patent/CN103442616B/zh active Active
- 2011-10-06 WO PCT/EP2011/004989 patent/WO2012123004A1/fr active Application Filing
- 2011-10-06 ES ES11767928.2T patent/ES2647582T3/es active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012123004A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102011013621B4 (de) | 2018-02-22 |
DE102011013621A1 (de) | 2012-09-13 |
CN103442616B (zh) | 2016-01-13 |
EP2683271B1 (fr) | 2017-08-16 |
ES2647582T3 (es) | 2017-12-22 |
WO2012123004A1 (fr) | 2012-09-20 |
CN103442616A (zh) | 2013-12-11 |
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