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.
• 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.
• 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 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.
• 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.
• FIG. 3 shows the brush finishing device according to Figure 1 in the closed, that is, clamped state
• FIG. 6 is a front view of the brush finishing device in the position according to Figure 2,
• 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 wedge shape extends over the entire upper edge facing the brush 12.

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• Brushes (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=73543243

Family Applications (1)

Country Status (6)

Citations (3)

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  • 2020-11-19 EP EP20811271.4A patent/EP4064933A1/de not_active Withdrawn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

Patent Citations (3)

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