Classifications

• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D9/00—Machines for finishing brushes
  • A46D9/02—Cutting; Trimming
  • A46D9/025—Deflecting parts of the bristle field in order to trim the rest
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46B—BRUSHES
  • A46B9/00—Arrangements of the bristles in the brush body
  • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
  • A46B9/04—Arranged like in or for toothbrushes

Definitions

• the invention relates to a brush finishing device for removing protruding bristles from a bristle assembly, the bristles of which are attached to a bristle carrier and which together with the bristle carrier form at least part of a brush, the bristle assembly having a free end.
• the invention also relates to a method for removing protruding bristles from a bristle composite of a brush.
• bristles or entire bundles of bristles are attached to a bristle carrier. This can be done by means of an anchor or a loop, which is pressed into the wall or into the bottom of an opening in the bristle carrier, or without an anchor.
• an anchor or a loop which is pressed into the wall or into the bottom of an opening in the bristle carrier, or without an anchor.
• bristles are encapsulated at their fastening end or, after being pushed through an opening in the bristle carrier, they are welded or fused on the back.
• Yet another method consists in inserting a thickened fastening end of the bristle or the bristle bundle into a blind hole and narrowing this at the front in the area of the edge by reshaping the bristle carrier.
• the bristle composite is more soft at the end if numerous bristles intentionally protrude from others, which can protect the gums.
• the bristles within the bristle assembly end within a certain tolerance threshold, without all of them being exactly in one plane.
• This termination of all ends in one plane is also not technically possible, since there will always be manufacturing tolerances.
• Brush manufacturers therefore specify certain tolerances within which the ends of the bristles of a bristle assembly should or may be.
• a method is known from DE 3742 771 A in which protruding bristles are cut off, for example by first moving a stop plate close to the bristle composite and then using a knife to press the laterally protruding bristle against the stop plate and cut it off.
• This method is particularly suitable when the bristles bend outwards at the edge and protrude to the side.
• Another method consists in moving two clamping parts towards each other in the area of the ends of the composite and thus gripping the protruding bristle, as with tweezers.
• it is important that the two clamping parts are very close to the protruding bristle Coincidence, otherwise they would not grasp the protruding bristle, but this would only be pushed away and bent by one of the clamping parts.
• the object of the invention is therefore to find a brush reworking device and a method for reworking brushes which make manual reworking superfluous and with which protruding bristles can be removed from a bristle composite.
• a brush finishing device for removing protruding bristles from a bristle composite, the bristles of which are attached to a bristle carrier and with this form at least part of a brush, the bristle composite having a free end.
• the brush finishing device according to the invention comprises at least three parallel, in particular plate-like clamping parts, which have an end edge facing the free end, the end edge running in a wedge shape towards the end of the bristle assembly, and a drive device which can distance the clamping parts from one another and move their clamping sides towards one another to clamp protruding bristles between the clamping sides.
• the drive device can also move the clamping parts, which have moved towards one another, away from the bristle carrier in order to pull the protruding bristles out of the bristle carrier.
• the brush finishing device divides the bristle composite into numerous segments, that is to say at least into two segments due to the at least three plate-like clamping parts. This ensures that the bristles of the entire bristle composite are hardly bent or not bent at all when they finally migrate between their associated two clamping parts and are clamped there.
• the wedge-shaped end edge is also important because it ensures that the bristle composite is divided into these different segments and that no bristle rests against a flat face of a clamping part and is bent there. Rather, the bristles run parallel or almost parallel, without any significant bending, up to the area between the clamping parts.
• the free end of the bristle composite is determined by the free ends of its bristles.
• the clamping sides can preferably be aligned flat and parallel to one another in the contact area with the transferring bristles.
• the closing direction is preferably perpendicular to the clamping sides or the flat contact areas.
• the clamping parts can have grooves transversely to the pull-out direction, into which the strongly protruding bristle is then partially pressed during its elastic deformation, so that it can no longer slip relative to the clamping parts when it has to be pulled out.
• the gripping force can thus be increased without the risk of the protruding bristle tearing off.
• clamping parts have an indentation between the contact area and the opposite end in the clamping sides. This has the advantage that there is no contact between adjacent clamping parts in the central area where the indentation is present and the protruding bristles are always reliably clamped in the contact area. In particular, the force is applied to the plate-like clamping parts in the central area.
• the wedge shape preferably extends over the entire longitudinal edge of the plate and can taper to an edge.
• the wedge-shaped end edge can optionally have a height in the direction of the bristle carrier which is greater than 2 mm. This is sufficient to penetrate the bristle composite and divide it up.
• the clamping parts have, for example, a maximum thickness of a maximum of 2 mm.
• all clamping parts can have an identical geometry, but at least an identical geometry in the area of the terminating edge.
• the bristle carrier always has a front side facing the free end of its bristle assembly which protrudes from the bristle carrier.
• the clamping parts run perpendicular to this front side, more precisely perpendicular to the area of the front side in which the clamping parts are located and in which they could theoretically pull out protruding bristles.
• the brush finishing device according to the invention can namely also be used with round brushes or with brushes with a curved bristle carrier.
• the front side is not flat, so that the clamping parts may optimize the bristle composite in several cycles by pulling out bristles that protrude too far in the section to be machined in several cycles.
• the bristle carrier is rotated (in the case of a round brush) or clocked further, for example in the case of a curved hairbrush.
• the bristle carrier can have an elongated bristle field, as is the case, for example, with a toothbrush or a hairbrush.
• the clamping parts preferably run in the longitudinal direction of the bristle field, so that relatively few clamping parts are sufficient and at the same time the spacing of the clamping parts from one another (as long as they are not moved towards one another) is small. With a small spacing between the clamping parts, the accuracy with which the bristles can be clamped is increased.
• the bristles lying at the edge of the gap between two not yet moved together clamping parts are only bent slightly when the clamping parts are moved together and the free ends of the bristles protruding too far then get into the clamping area of the clamping parts.
• a plurality of groups of clamping parts to be reworked one after the other can be present, the clamping parts of the first group being oriented differently to those of the second group with respect to a bristle carrier to be reworked.
• the clamping parts of the second group are aligned at right angles to the clamping parts of the first group.
• the invention also relates to a method for removing protruding bristles from a group of bristles of a brush, the group of bristles having a free end.
• the procedure is characterized by the following steps: At least three parallel, spaced-apart clamping parts are moved against the free end of the bristle assembly, the clamping parts having a terminating edge facing the free end, which tapers towards the end of the terminating edge in a wedge shape, so that the bristle assembly is divided between the at least three clamping parts, the clamping parts so stay away from the bristle carrier so that only protruding bristles get into the area of the clamping sides of the clamping parts, the clamping parts are moved towards each other so that protruding bristles are clamped between clamping sides of adjacent clamping parts, and the clamping parts are removed from the bristle carrier and the protruding bristle is removed from the Bristle holder pulled out.
• the bristle composite can have a longitudinal direction with a view of the free end and the clamping parts can then be aligned in the longitudinal direction.
• the clamping parts in the area of the flat side are moved towards the bristle composite at a distance from one another.
• the movement can either take place on the free end, that is to say the clamping parts are moved towards the bristle composite essentially in the longitudinal direction of the bristles, or they are moved laterally in the region of the ends into the bristle composite.
• the spacing of the clamping parts from the bristle carrier is selected so that the correctly seated bristle ends protrude into the area of the wedge-shaped end edges, but not into the area of the clamped sides. This alignment ensures that the clamping parts subdivide the bristle composite into sections.
• the bristle ends of the bristle composite are preferably sharpened, here either chemically and / or mechanically.
• the wedge-shaped end edges and the number of clamping parts can be matched to the bristle ends so that the correctly seated bristle ends, that is, the bristle ends that are not excessively protruding, are not between the bristle ends End edges are clamped in such a way that they can be pulled out through the clamping parts.
• the wedge-shaped end edges and the number of clamping parts are matched to the bristle ends and the clamping parts are moved so far into the bristle assembly that the correctly seated bristle ends end between the end edges.
• the clamping parts thus divide the bristle composite into segments.
• So many clamping parts can be used in relation to the width of the bristle composite, which is to be processed in one step, that the bristle composite is divided into two, three, four, five or six or even more sections, that is, three, four, five , six, seven or more clamping parts.
• Another special feature of the present invention is that with the brush finishing device according to the invention and the method according to the invention, the geometry of the clamping parts does not have to be adapted to the image of the bristle assembly, also called the hole pattern. Due to the small width between two adjacent clamping parts, which are still spaced apart from one another, it does not matter whether several circular bristle bundles form the composite or several elongated bristle fields that cross one another or run parallel to one another, or other bundle patterns.
• the device according to the invention can rework on the so-called stuffing drum, which continues to cycle the bristle carriers, or it can be installed in the stuffing station as a reworking device after the stuffing device and the stuffing drum.
• the brush can optionally remain in the same holder that carried the bristle carrier in the stuffing device.
• Another variant provides that the reworking takes place, for example by attaching the bristle carriers to the stuffing drum, which rotates.
• the stuffing processes are then carried out in a certain position of the drum. After the tamping, the drum is then rotated further and the method according to the invention and the brush finishing device according to the invention can then work in this new position.
• the brush can of course be removed from the stuffing device or the entire stuffing station, for example fully automatically using a gripper or a robot / a programmable multi-axis handling device or by hand.
• the bristle carriers can, for example, remain attached to holders that sit on a chain or in a so-called tensioning device that holds the bristle carrier in the stuffing station.
• Another alternative is to provide the brush finishing device as a station which is located immediately after the tamping station.
• FIG. 1 is a perspective side view of a brush finishing device according to the invention in the open state
• Figure 2 the brush finishing device according to Figure 1 in the delivered state, in which it receives a bristle composite
• FIG. 3 shows the brush finishing device according to Figure 1 in the closed, that is, clamped state
• FIG. 4 shows the brush finishing device according to Figure 1 after pulling out a bristle protruding too far
• FIG. 5 is a front view of the brush finishing device in the state in the position according to Figure 1,
• FIG. 6 is a front view of the brush finishing device in the position according to Figure 2,
• FIG. 7 is a front view of the brush finishing device in the position according to Figure 3
• FIG. 8 shows a front view of the brush finishing device in the position according to FIG. 4, and
• FIG. 9 shows a combined brush tamping device with a brush finishing device according to the invention.
• FIG. 1 shows a brush reworking device 10 which reworks already finished or nearly finished brushes 12 by pulling bristles 14 of a bristle assembly 16 out of the bristle assembly 16 that protrude beyond a predetermined tolerance threshold.
• the brush 12 is a toothbrush, which, however, is only an example. Any type of brush can also be processed by the brush finishing device 10.
• the brush 12 comprises a bristle carrier 18 into which a plurality of bristle bundles 19 are inserted and fastened in the bristle carrier 18 in order to create a bristle composite 16.
• the bristle composite 16 is thus the sum of all attached bristles and bristle bundles 19.
• the bristle carrier can be part of the brush body (e.g. a plate) or the entire brush body. In any case, the bristle carrier becomes part of the finished brush.
• the bristle bundles 19 are either fastened without anchors or with an anchor in the bristle carrier 18, as already mentioned at the beginning.
• the type of fastening is not decisive for the functioning of the brush finishing device 10, because it functions with any type of fastening of the bristles to the bristle carrier 18.
• the bristle composite 16 has a free end 20 which is composed of the free ends of all the bristles of the bristle bundles 19.
• the free ends are those ends which are not fastened in the bristle carrier 18.
• the position of the free ends of the bristles is not always identical, that is to say the distance from a so-called front side 22 of the bristle carrier 18, where the bristle bundles 19 are attached, is unequal. Due to the manufacturing process, there is a certain tolerance within which the ends of the bristles lie. Also, the ends of the bristles do not have to lie within a plane or optimally form a plane; rather, it is sometimes deliberately desired to have the ends end slightly differently from the front side 22 so that they end individually and not grind along the teeth or gums as a common, relatively hard unit. This makes it easier for individual, further protruding bristles to penetrate into the interdental spaces.
• a bristle 14 is shown which lies clearly outside this tolerance field and protrudes from the end 20 of the bristle assembly 16, in particular protrudes by more than 1 mm. This singular, far protruding bristle 14 would make the brush 12 a reject product.
• this singular bristle 14 is released from the bristle composite and pulled out.
• the brush finishing device 10 comprises a plurality of thin, in particular a maximum of 1.5 mm thick clamping parts 24 - 34, which have opposite, flat clamping sides 36, which all run towards one another.
• the clamping parts 24 - 34 each have a terminating edge 38 facing the free end 20, which does not end flat in an end face, but rather tapers towards the end in a wedge shape, in particular tapers to an edge 40.
• All of the clamping parts 24 - 34 preferably have such an end edge 38 in the shape of a wedge.
• the wedge shape extends over the entire upper edge facing the brush 12.
• the wedge shape runs over the entire longitudinal extent, preferably also uniformly.
• the clamping parts 24 - 34 are mounted displaceably perpendicular to their clamping sides 36, for example by means of continuous rails or bolts.
• a drive device with at least a first drive 42 and a second drive 44 is provided, the drive 42 moving the clamping parts 24-34 towards and away from each other at right angles to their clamping sides 36 and the drive 44 can move the clamping parts 24 - 34, preferably parallel to the clamping sides 36 and in the longitudinal direction of the bristles of the bristle composite 16 (direction A) and / or parallel to the front side 22 in the area of the bristle bundles 19 to be processed and back in the opposite direction (direction B) can proceed.
• a drive device that moves in other directions can also be provided.
• the end edges 38 must be able to be moved towards and away from the area of the bristle composite 16 that is to be reworked.
• the clamping parts 24 - 34 are all slightly spaced from one another, so that gaps 46 arise in the area of opposing clamping sides 36.
• these gaps 46 can be of the same size.
• the drive 44 is the
• the end edges 38 penetrate the bristle composite 16, as shown in FIGS.
• the infeed depth is selected so that the ends of the correctly seated bristles and thus the end 20 of the bristle composite always lies in the area of the terminating edge 38 between two adjacent clamping parts 24-34. That is, the clamping parts 24-34 subdivide the bristle composite 16 into different sections. These different sections do not have to be formed by individual bundles of bristles 19; rather, the brush finishing device 10 with the clamping parts 24
• - 34 also subdivide a bundle 19 into several sections, depending on the position of the bundle 19 in relation to the clamping parts 24-34.
• the protruding bristle 14 is in any case between adjacent clamping sides 36 of two clamping parts 24-36, the area at the end of the
• Clamping sides 36 which comes into contact with the protruding bristles 12, is the so-called contact area 39, which begins at the respective end of the terminating edge 38, see FIGS. 1 and 2.
• the clamping parts 24 - 34 are moved towards one another by means of the drive 42, that is, at right angles to the clamping sides 36.
• the clamping sides 36 then lie against one another under pretension at least at opposite contact areas 39 at.
• the individual bristles can then slide laterally over the edges 40 into adjacent spaces between adjacent end edges 38.
• clamping sides 36 are always flat.
• they can also have one or more grooves 50 running transversely and parallel to the edges 40.
• the elastic, protruding bristle 14 is squeezed and can then spread out into the groove 50 so that it is better held between the clamping parts.
• the groove 50 is therefore preferably in no way sharp-edged in relation to the flat area of the clamping parts 24, but is rounded so that the bristle 14 is not sheared off.
• clamping parts 24 have an indentation 53 in the central area between the contact area 39 and an opposite end 51 (see area in FIG. 2) in the clamping sides 36, as is symbolically indicated in FIGS.
• the plate-like clamping parts 24-34 are thus somewhat thinner in the central area. This has the advantage that in the central area, where the indentation 53 is present, there is no contact between adjacent clamping parts and the protruding bristles are always reliably clamped in the contact area 39. In particular, the force F is applied to the plate-like clamping parts 24-34 in the central region.
• the contact area 39 and end 51 can each be flat and, optionally, also lie in a common plane.
• the wedge-shaped end edge 38 preferably has a flea h (see FIG. 8) which is between 1.5 and 3 mm, preferably greater than 2 mm. This covers all tolerances within the ends of the correctly embedded bristles.
• the brush finishing device 10 can also be used to remove an excessively protruding bristle 14, which is embedded, for example, in a bristle composite 16 in which the bristle bundles 19 run obliquely to one another or, as in electric toothbrushes, run in a kind of vortex.
• the clamping parts 24-34 naturally have an edge 40 and a terminating edge 38 which reproduces the desired sawtooth geometry.
• the post-processing will take place in several steps.
• the clamping parts 24 - 34 are moved towards one another in order to process a cylinder segment of this brush and pull out the bristles 14 protruding in this area, then the Brush reworking device is reopened and the brush is rotated so that a subsequent segment can be reworked.
• the brush finishing device 10 does not necessarily have to be removed from the bristle carrier 18, because due to the tapering end edges 38 there is no risk of the bristles grazing along when the bristle carrier 18 is rotated lying outside the brush finishing device 10 or that bristles 14 protrude excessively could not be clamped between clamping sides 36.
• the clamping parts 24 - 34 moved together here have an overall width which corresponds to the overall width of the bristle assembly 16. It should be noted, however, that due to the wedge shape in the form of an isosceles triangle, the outer clamping parts 24 and 34 each have a few bristles which cannot be clamped on the outer sides. In order to also grasp these bristles lying on the very outside (on the left and right in FIG. 7) and to be able to pull out any protruding bristles present there, the brush finishing device can, for example, post-process in two cycles. In a first cycle it is shifted slightly to the right in relation to the position in FIG. 7 and slightly to the left in a final, second cycle, so that the very outer bristles can always lie between the clamping parts 24-34.
• the clamping parts of the later reworking device 10 can, for example, be oriented obliquely to those of the first reworking device 10, for example also at right angles (see FIG. 9 with the two groups of
• Post-processing devices 10 each having the previously discussed clamping parts 24-34). Furthermore, it can be provided, for example, that the wedge-shaped End edges 38 do not run symmetrically in cross section with respect to an imaginary center line (equilateral triangle), as in the variants shown, but that at least for the very outer clamping parts 24 and 34 a flat side 36 (for the outer clamping parts 24, 34 the flat side 36 pointing outwards in each case ) runs up to the pointed edge 40 and then the bevel runs from the pointed edge to the opposite flat side 36.
• an imaginary center line equilateral triangle
• extensions 70 can be molded or attached to the clamping parts (see FIG. 8), which are then slightly angled so that elastic elements 72 are provided between the extensions of directly adjacent clamping parts 24-34 which can be pressed together so far that the clamping sides 36 can lie against one another, but which then cause the clamping parts 24 - 34 to move apart automatically when the drive 42 is retracted.
• the laterally protruding clamping parts lying against one another in pairs can also themselves have leaf-spring-like extensions 70 which can bear against one another. Thus, no additional elastic elements have to be provided between them.
• the clamping parts 24-34 move, as mentioned, essentially perpendicular to the front side 22 in the area of the processed bristle composite, before the clamping parts 24-34 are moved towards one another.
• the bristles of the bristle composite are then pushed apart.
• the brush finishing device 10 is not moved perpendicularly to the front side 22 from a position laterally displaced in relation to FIG. 2, but rather parallel in direction B to it.
• the clamping parts 24 - 34 are shifted further to the rear to the right in relation to FIG. 2 towards the rear end of the bristle carrier 18.
• the clamping parts 24 - 34 are then pushed forward and divide the bristle composite 16 or the bristle bundles 19 into segments until the position in FIG. 3 is reached.
• FIG. 9 a brush manufacturing device is shown, with a drum 60 rotating about an axis X, which has a plurality of clamping devices 62 for bristle carriers 18 on its circumference. In one position of the drum 60, here at 3 o'clock, that is to say on the right, the bristle carriers 18 are stuffed.
• This tamping is shown only by way of example, namely by means of a classic tamping device 64 which drives a bristle bundle 19 together with an anchor into the corresponding opening in the bristle carrier 18 via a movable tongue and folds the bristle bundle 19.
• the drum 60 is rotated further in the direction of the arrow.
• the finished stuffed brush is then reworked with the aid of the brush reworking device 10.
• a further group of clamping parts can optionally be present, the clamping parts of which are oriented differently to the bristle carrier 18 than those of the clamping parts 24 - 34 shown in FIG. 9 o'clock.
• This further group is shown here at 12 o'clock.
• Their clamping parts are different from those of the first group, e.g. 90 ° to them in relation to the bristle carrier 18 to be processed, so that the interfaces between the contacting contact parts 24 - 34 run differently to the bristle assembly 16.
• the cycle is then continued, and the reworked brush is removed and an unstuffed bristle carrier 18 is inserted again.

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ID=73543243

Family Applications (1)

Country Status (6)

Family Cites Families (3)

• 2019
  • 2019-11-27 DE DE102019132194.8A patent/DE102019132194A1/de not_active Withdrawn
• 2020
  • 2020-11-19 EP EP20811271.4A patent/EP4064933A1/de not_active Withdrawn
  • 2020-11-19 WO PCT/EP2020/082773 patent/WO2021105003A1/de unknown
  • 2020-11-19 JP JP2022530265A patent/JP2023503336A/ja active Pending
  • 2020-11-19 CN CN202080082435.9A patent/CN114745987A/zh active Pending
  • 2020-11-25 TW TW109141242A patent/TW202135702A/zh unknown

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