• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An apparatus and a process for manufacturing brushes, in particular toothbrushes, having a plurality of filaments joined to form hair bundles are described. At least one bundle carrier is present which has several holes for inserting hair bundles, the hole pattern of which corresponds to the bundle model of the brush to be produced. The filaments of bundles inserted into the bundle carrier (12) are welded together at the rear of the bundle carrier (12) by means of a welding device. This welding device is an ultrasonic welding device.
    公开号:BE1021282B1
    申请号:E2013/0140
    申请日:2013-03-05
    公开日:2015-10-20
    发明作者:Bart Gerard Boucherie
    申请人:Gb Boucherie Nv；
    IPC主号:
    专利说明:

    Device and process for manufacturing brushes, in particular toothbrushes
    The invention relates to a device and a process for manufacturing brushes, in particular toothbrushes, which have a plurality of filaments assembled into hair bundles, wherein at least one bundle carrier is present, which has a plurality of holes for the insertion of the hair bundle, the bundle model of the brush to be produced corresponds to a welding device which welds the filaments of bundles pushed into the bundle carrier together.
    Two different processes and devices for manufacturing brushes, in particular toothbrushes, form the basis thereof. The first method and the first device work with so-called anchors. These are small metal plates that anchor folded hair bundles in the brush head. The anchors are pressed into the brush head, so to speak, at the edge of the openings present in the brush head. The second process and the second device operate without anchor (for example, the so-called AFT process). Hereby the hair bundles are usually, but not necessarily, not folded and attached to the brush head without additional element. This can happen, for example, when a bundle carrier that has a hole pattern corresponding to the later bundle model of the finished brush is filled with hair bundles by plugging. At the rear of the bundle carrier, the filaments are then either welded together per individual bundle or for all bundles. This welding is usually done by pressing a hot stamp against the rear side against the filaments protruding from the bundle carrier. The bundle carrier is, for example, a holding plate which, after welding of the filaments, is fixed to the brush body by again welding, gluing or plug-in connections, etc. As an alternative, it can of course also be put directly into the brush head, which is already connected in one piece to the handle, the filaments being welded together at the rear of the brush head. Then, for example, a type of lid is sprayed, welded or glued to the rear of the brush head. Another possibility is to spray the filaments welded together, so that they are embedded in the sprayed brush head or the sprayed holding plate. According to this last possibility, the aforementioned bundle carrier can directly be a head insert of an injection molding tool (for example a so-called perforated plate), i.e. the bundle carrier does not form part of the final brush.
    It is the object of the invention to achieve an improved device and an improved process with which brushes can be made anchor-free.
    The invention establishes a device which can be used in all devices and processes proposed above, which operate according to the anchor-free principle.
    The device according to the invention of the type mentioned at the beginning has the feature that the welding device is an ultrasonic welding device.
    Via ultrasonic welding, the filaments of at least one hair bundle or, alternatively, filaments of nearby hair bundles, are welded together to form a unit.
    The advantage of the ultrasonic process is, among other things, that smaller amounts of energy are required and that the welding of the filaments takes place in a particularly 'pure' way, that is, without large quantities of liquid thermoplastic being formed.
    The welding device according to the invention preferably has a sonotrode, which rests against the filament ends at the rear, for welding them together. The sonotrode also moves relative to the filaments, so that friction occurs between the ends of the filaments and the surfaces of the sonotrode or a part coupled to the sonotrode and thus moving with the sonotrode. The filaments are then heated and welded together by friction.
    Of course it is also possible to move the bundle carrier and thereby drive the filaments relative to a fixed plate which is in contact with the filament ends, and thereby generate the friction.
    The welding device preferably has a sonotrode, which is moved back and forth during welding in a direction or plane, wherein the movement has a (non-zero) movement component that is transverse to the longitudinal axis of the filaments. Tests have shown that although a movement of the sonotrode in the longitudinal direction of the filaments leads to good welding results, the filaments are very strongly moved towards each other on account of the longitudinal movement within the bundle. The filaments welded to each other are therefore not neatly parallel and aligned next to each other after the welding process. In order not to have to carry out a post-processing, it is very advantageous if a reciprocating movement of the sonotrode relative to the filaments is provided which has a transverse component.
    This transverse component must be aligned at least 80 °, preferably even 90 °, relative to the longitudinal axis of the filaments during welding. The perpendicular alignment with respect to the longitudinal axis of the filaments has been found to be particularly advantageous here because no "disorder" is caused here in the alignment of the filaments of a hair bundle.
    The bundle carrier can be a holding plate which is a part of the finished brush (for example a so-called head plate, which can be connected to the head of the brush by, for example, welding, gluing, spraying, etc.) or, alternatively, is the entire brush body ( that means handle and brush head formed in one piece).
    Alternatively, the bundle carrier may also be a transport unit that holds the bundles in a mounting station or transports them into a mounting station where they are connected to a holding plate or a brush body. This joining can be done either by spraying filaments or bundles welded together or by placing the filaments or bundles welded together in the holding plate, which forms a segment of the later brush.
    As a further alternative, the bundle carrier can also be directly a wall of an injection molding tool or a part of this wall resp. a cavity or a partial cavity.
    The filaments or bundles enclosed in such a bundle carrier also protrude directly into the cavity or sub-cavity of the injection-molding tool, where they are then sprayed (with or without the use of another carrier) for the manufacture of the brush or part of the brush.
    In a further embodiment, the device according to the invention can furthermore comprise a punch for forming and curing the filament ends which are liquid by ultrasonic welding. As soon as the filament ends have been sufficiently liquefied by ultrasonic welding, the stamp is pressed out of the liquid thermoplastic to transform and cure the thermoplastic. By using the stamp, a kind of layer can be formed which is only formed by the material of the liquefied filament ends.
    The stamp can be a separate component or it can also be the sonotrode, which, preferably as soon as it is stationary, serves to cool the liquid thermoplastic material.
    The sonotrode can for instance also be provided with an active cooling device. This air and water cooling is activated after the filament ends are liquefied and provides a sudden cooling.
    The sonotrode may be roughened on its contact surfaces with the filament tips to increase friction.
    The amplitude of the movement of the sonotrode in the transverse direction should preferably be greater than the standard amplitude, which is available at the factory for sonotrodes. With a standard generator frequency of, for example, 36 kHz, the amplitude must be greater than 0.15 mm, with higher frequencies possibly a little lower.
    The invention furthermore provides a process for the production of brushes, in particular toothbrushes, which have a plurality of filaments assembled into hair bundles, the brush having openings which together form a hole pattern in which hair bundles are formed to form a bundle model. The process includes the following steps:
    Providing at least one bundle carrier, which has a plurality of holes for inserting hair bundles, the hole pattern forming the holes occupied by hair bundles corresponding to the bundle model of the brush to be produced,
    Retracting the bundle in the bundle carrier, and ultrasonic welding of the filaments of such bundles, which are pushed into the bundle carrier, the filaments being ultrasonically welded to each other at the rear of the bundle carrier.
    Further features and advantages of the invention appear from the following description and from the following drawings, to which reference is made. On the drawings: - Figure 1 shows a schematic cross-section through a first embodiment of the device according to the invention, for carrying out the process according to the invention, - Figure 2 shows a representation of the device in accordance with Figure 1 after ultrasonic welding, - Figure 3 shows the device according to Figure 1 when cooling, - Figure 4 shows a schematic cross-section through a second embodiment of the device according to the invention, for carrying out the process according to the invention, - Figure 5 shows a perspective view of a further embodiment of the device according to the invention, for carrying out the process according to the invention, - Figure 6 shows a cross-section through a toothbrush manufactured with the device according to the invention and with the process according to the invention, and - Figure 7 shows a cross-section through another with the device according to the invention and with the process according to the invention arid toothbrush.
    Figure 1 shows a device for manufacturing brushes, in particular toothbrushes, simplified in schematic cross-section.
    The invention comprises one or more stations in which the individual process steps for manufacturing brushes are carried out. The so-called thermoplastic filaments are removed in bundles 10 from a magazine and put in a bundle carrier 12. The bundle carrier 12 may, as in the available example, be a holding plate which forms part of the later toothbrush.
    This bundling of the bundle is done without folding the bundle, which means that each filament forms a hair.
    The bundle carrier 12 has a rear side 14, which is closed outwards in the finished state of the brush, as well as an opposite front side, from which the bundles 10 protrude.
    Inserting the hair bundle 10 into the bundle carrier 12, which has a hole field with a hole pattern that defines the later hair field with the corresponding bundle model, is done either by direct insertion of the hair bundle into the bundle carrier 12 or by prefabrication by means of a so-called hole plate 16, which constitutes a sort of transport warehouse or unit of the device.
    It is of course possible not to fill one or more holes with hair bundles, but to inject an elastic plastic part, which serves for example for the gum massage.
    If a hole plate 16 is present, it has a hole field with a hole pattern that fully or substantially corresponds to the bundle carrier 12. The hair bundles are inserted into the openings in the hole plate 16, and only then is the unit from filled hole plate 16 with hair bundle 10 and bundle carrier 12 brought together to slide the hair bundle into the bundle carrier 12.
    A positioning plate 18 can thereby help to position all ends of the filaments on the front side uniformly or in profile towards the front side of the bundle carrier 12.
    At the rear, the ends (20) of the filaments (hereinafter referred to as filament ends) face the bundle support 12, that is, they protrude from the holes assigned to them.
    An ultrasonic welding device 22 with a sonotrode 24 forms part of the device. The sonotrode 24 is lightly pressed against the filament ends 2 with a roughened contact surface and then moved back and forth transversely with respect to the longitudinal extension of the beam at ultrasonic speed. The back and forth movement of the sonotrode can thereby be linear or have a closed curve course. The back and forth movement of the sonotrode 24 has a movement component deviating from zero, which, as stated, extends transversely to the longitudinal extension or longitudinal axis of the filaments. This direction of movement 5 or the plane of movement is at least 80 °, but preferably 90 ° relative to the longitudinal axis of the filaments and / or is parallel to the rear side 14.
    Of course, during welding, a minimal extra movement of the sonotrode 24 in the filament direction can be added to the reciprocating movement.
    The filaments are heated and melted by the friction of the filament ends 20 with the corresponding contact surfaces of the sonotrode 24.
    At least the filament ends 20 of one bundle 10 are welded together by the movement, as shown in Figure 2, with the sonotrode 24 removed again.
    Depending on the axial pressing force of the sonotrode and / or the action time of the sonotrode and / or its movement amplitude, only the filament ends 20 of a bundle 10 or several neighboring bundles 10 or even all hairs of the brush can be welded together. In the embodiment according to Figure 2, only the filament ends 20 of a bundle 10 are welded together as a kind of drop.
    As soon as the filament ends 20 are fluid enough, the sonotrode 24 is removed again (Figure 2).
    A stamp 28 is then pressed against the liquid filament ends (see Figure 3), to transform and cure the liquid material.
    A kind of layer 30 is thus formed from thermoplastic, which is formed by the liquid filament ends.
    As an alternative to the formation according to figure 3, wherein a separate punch 28 is provided, the device can also be designed such that the sonotrode 24 simultaneously forms the punch, as shown in figure 4.
    The sonotrode 24 is here provided with an active cooling device 32. That is, a gas or liquid-conducting channel through the sonotrode 24 makes it possible to cool the sonotrode 24 immediately after welding the filament ends. This can be done, for example, without pulling the sonotrode off (Figure 2), whereby the sonotrode is simply kept in the transverse direction after transversal movement and welding. Due to limited heat development, this holding time can be kept very low compared to other melting or welding processes.
    The sonotrode can then, for example, also be actively pressed further in direction on the filament ends 20, so that the liquid thermoplastic material from the filament ends 20 is transformed into a layer 30 or flat-pressed drops. The cooling device is then activated during this additional movement or thereafter.
    Alternatively, after the filament ends 20 have been liquefied, the sonotrode 24 can also be raised and the cooling device 32 activated, so that only then will the sonotrode 24 be pressed against the liquid thermoplastic mass without longitudinal movement of the filaments in the longitudinal direction of the filaments.
    Figure 5 shows an industrial embodiment of the device according to the invention, with a carrier plate 42 on which a plurality of sonotrodes 24 are present. By means of guides 44, the carrier plate 42 can be moved in an additional direction relative to a plurality of bundle carriers 12, which are placed in a magazine 46. As an alternative to this, there is a sonotrode provided on the carrier plate 42, which is coupled to the parts indicated by 24 and moves it simultaneously, so that the surfaces coming into contact with the filament ends 20 can be designated as part or spur of the sonotrode 24.
    Figure 6 shows an embodiment of the finished toothbrush, wherein the bundle carrier 12 is already a one-part component of the sprayed brush body. This means that the bundle carrier 12 merges in one piece into the brush neck 48 and the stem (not shown).
    As an alternative to this, see Fig. 7, the bundle carrier 12 can also be designed as a holding plate, which is sprayed on after welding the filament ends 20 or is applied to the brush body by gluing or ultrasonic welding.
    Furthermore, it is also possible to design the bundle carrier 12 as a transport unit, so to speak, as a hole plate, which is not part of the later brush, but only serves as a prefabrication unit and transport magazine.
    Here, for example, with respect to Figure 1, the bundle carrier 12 is omitted. The hole plate 16 therefore serves as a bundle carrier. After welding the filament ends, the hole plate 16 is used as part of an injection mold so that it closes a hollow space of an injection molding tool together with a mold half to be produced. In this embodiment, the bundle ends 20 welded to each other are over-molded and, at the over-injection, either embedded in the entire brush body with handle or in a part thereof.
    权利要求:
    Claims (20)
    [1]
    CONCLUSIONS
    1. - Device for manufacturing brushes, in particular toothbrushes, which have a plurality of filaments assembled into hair bundles (10), wherein at least one bundle carrier (12) is present, which has a plurality of holes for the insertion of hair bundles, the hole pattern of which corresponds to the bundle model of the brush to be manufactured, and to a welding device which welds the filaments of bundles (12) inserted into the bundle carrier (12) together at the rear of the bundle carrier (12), characterized in that the welding device is an ultrasonic welding device (22).
    [2]
    Device according to claim 1, characterized in that the welding device (22) has a sonotrode (24) which rests against the filament ends (20) at the rear to melt it.
    [3]
    Device as claimed in claim 1 or 2, characterized in that the welding device (22) has a sonotrode (24) which is reciprocated during welding in a direction or in a plane, with a movement component which is transverse relative to the longitudinal axis of the filaments.
    [4]
    Device as claimed in claim 3, characterized in that the sonotrode (24) is moved back and forth in a direction or a plane during welding, which is at least 80 °, preferably 90 ° with respect to the longitudinal axis of the filaments.
    [5]
    Device according to one of claims 2 to 4, characterized in that the device is constructed in such a way that it not only welds the filaments of a bundle (10), but also the filaments of neighboring bundles (10) together .
    [6]
    Device according to one of claims 2 to 5, characterized in that the sonotrode (24) is constructed in such a way that it only makes contact with the rear filament ends that protrude at the rear of the bundle carrier (12).
    [7]
    Device according to one of the preceding claims, characterized in that the bundle support (12) is a holding plate which forms a part of the finished brush and wherein the welded filaments are not welded to the holding plate, or a transport unit which keeps the bundles of filaments in a mounting station or transports them there.
    [8]
    Device according to one of the preceding claims, characterized in that a stamp (28) for forming and curing the ultrasonic welding liquid ends (20) of the filaments is provided.
    [9]
    Device according to claim 8, characterized in that the stamp (28) is the sonotrode (24).
    [10]
    Device according to claim 9, characterized in that the sonotrode (24) is provided with an active cooling device (32).
    [11]
    Device according to one of the preceding claims, insofar as it relates to claim 2 or 3, characterized in that the amplitude of the movement of the sonotrode (24) in the transverse direction during welding is greater than 0.15 mm.
    [12]
    Device according to one of the preceding claims, characterized in that the contact surface moved by ultrasonics, against which the filament ends (20) rest, is roughened.
    [13]
    13. - Process for manufacturing brushes, in particular toothbrushes, which have a plurality of filaments assembled into hair bundles (10), the brush having openings which together form a hole pattern in which hair bundles for forming a bundle model are incorporated, with as a feature the following steps: providing at least one bundle carrier (12) which has a plurality of holes for inserting hair bundles, the hole pattern forming the holes occupied by hair bundles corresponding to the bundle model of the brush to be manufactured, sliding the bundle into the bundle carrier (12), and connecting the filaments at the rear of the bundle carrier (12) by ultrasonic welding of the filaments of bundles (10), which are inserted into the bundle carrier (12).
    [14]
    A method according to claim 13, characterized in that an ultrasonic welding sonotrode (24) is used, which is reciprocated during welding in a direction or in a plane, the movement having a movement component transversely relative to the longitudinal axis of the filaments.
    [15]
    Process according to claim 14, characterized in that the filaments protrude on the rear side of the holding plate (12) and that the protruding ends of the filaments are welded together and in that the sonotrode (24) only connects the filaments together.
    [16]
    Process according to one of Claims 13 to 15, characterized in that not only the filaments of each bundle (10), but also the filaments of neighboring bundles (10) are welded together.
    [17]
    A method according to any one of claims 13 to 16, characterized in that the bundle support (12) is a holding plate that forms part of the finished brush, or a transport unit that holds the bundles of filaments in a mounting station or transports it there.
    [18]
    Process according to one of claims 13 to 17, characterized in that the amplitude of the transverse direction of the sonotrode (24) during welding is greater than 0.15 mm.
    [19]
    Process according to one of claims 13 to 18, characterized in that after melting the filaments by ultrasonic welding with a stamp (28), the liquid ends (20) of the filaments are formed and cured.
    [20]
    The method according to any of claims 13 to 19, characterized in that the filaments welded together are rear-sprayed and by spraying at least one of part of a brush body is sprayed.
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    同族专利:
    公开号 | 公开日
    DE202012002332U1|2012-03-22|
    DE102013100194A1|2013-09-05|
    ITMI20130150A1|2013-09-06|
    CN103284459A|2013-09-11|
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    法律状态:
    2018-12-10| FG| Patent granted|Effective date: 20151020 |
    2018-12-10| MM| Lapsed because of non-payment of the annual fee|Effective date: 20180331 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE202012002332U|DE202012002332U1|2012-03-05|2012-03-05|Device for producing brushes, in particular toothbrushes|
    DE120023322|2012-03-05|
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