EP3028602B1 - Brush tamping machine - Google Patents

Description

The invention relates to a brushing device for stuffing and fixing at least one bristle tuft by means of a loop in an opening of a brush body section according to the preamble of claim 1. Brushstop devices pick up bristle tufts and stuff them into an opening of a brush body section, with the bristle tufts being folded and folded Anchoring in the form of a loop of wire wraps the bristle tufts.

The pieces of wire may be either U-shaped bent or the piece of wire may have legs that are already bent so far that they touch or cross each other when they are pushed into the brush body portion. The term "brush body portion" includes both the entire brush body and only parts of the later finished brush body such as perforated plates, which are then connected to the remaining portion of the brush body, for example by molding or gluing or mechanical fastening.

In the FIGS. 1a to 1d the principle of a brushing device according to the prior art is shown schematically in successive steps. The stuffing tip, in which the parts described below are seated, has been omitted for simplicity. A along a guideway 10 back and forth movable tongue 12 is guided laterally, possibly also by a bending member 14 with lying laterally of the tongue 12 jaws. The tongue 12 is in FIG. 1a shown in the retracted position. Before the bending part 14, a wire is laterally inserted over a wire feed 15, which can come from a roll. In the trajectory in the direction of darn in front of the wire piece 16 is a so-called deformation pin 18, which protrudes in this state of the art in the plane of movement of the tongue 12, that is also in the trajectory 10 of the tongue 12 is positioned. When advancing the Bending part 14 is formed in this embodiment laterally on the bending part of a knife 20 at one edge, which cuts off a piece of wire 16 together with a counter knife 22. Upon further ancestor of the bending part 14, the opposite ends of the wire piece are bent around the deformation pin 18 (see FIG. 1b ), so that the wire piece 16 has a U-shape, whereby it can be even further bent later along the further movement path, so that the legs 24 of the wire piece 16 almost or already cross over.

Before the tongue 12 reaches the wire piece 16 in the ancestor, the deformation pin 18 is moved out of the plane formed by the tongue 12 and thus the trajectory 10 (see Figure 1c ), so that the tongue 12, the wire piece 16 move forward, it can grab a bristle tufts 26, this folds and in the folded state by a path in the Stopfspitze and then in the opening in the brush body portion abuts.

In FIG. 1 It can be seen that the supply of the wire piece 16 can only take place when the tongue 12 is retracted. In order to achieve the required high clock rates, the lateral feeding and bending of the piece of wire 16 and its cutting must be done extremely fast.

In order to enable the feeding and the deformation of the piece of wire 16 largely decoupled from the tongue movement, another principle has been developed, which in FIG. 2 is shown simplified and on which also the Bürstenstopfvorrichtung after the US 1,902,113 respectively. GB 367 586 A based. In this principle, the wire piece 16 is bent in a plane remote from the plane of the tongue 12 and from the trajectory 10, in particular an immediately adjacent parallel plane. In FIG. 2a it can be seen that the jaws coupled to a bending part 14 are located above the tongue 12 and that the wire piece 16 is likewise supplied laterally above the tongue 12. Also, the deformation pin 18 lies in this plane in which the forming of the wire piece 16 takes place.

One recognizes by means of the FIGS. 2a and 2b in that the tongue 12 is still in the extended position while the next wire piece 16 is already being fed laterally and during ( FIG. 2b ) provided with a recess bending part 14 is moved against the deformation pin 18 and the wire piece 16th deformed. Once the tongue 12 has moved back far enough ( Figure 2c ), the bent wire piece 16 is moved by a so-called scraper 30, which is symbolically represented here by arrows, in front of the tongue 12 and thus into the movement path 10 of the tongue 12. In this embodiment, the deformation pin 18 is not moved, but this is not meant to be limiting. The scraper 30 is adapted to the shape of the deformation pin 18 and surrounds it. The shape of the deformation pin and its thickness correspond to that of the wire piece 16. Subsequently, the tongue 12 can move the wire piece 16 to the bristle tuft 26, which is no longer shown here for the sake of simplicity.

Optionally, an intermediate part may be provided between the deformation pin 18 and the tongue 12, which is in particular stationarily positioned and which has an opening for temporarily receiving or temporarily guiding the wire piece 16 and from there the wire piece 16 continues in the direction of trajectory 10 from the wiper 30 is steered.

In FIG. 3 is the Bürstenstopfvorrichtung after the US 1,902,113 respectively. GB 367 586 A shown in longitudinal section, wherein the stuffing tip 32 can be seen with the guide channel 34 for the folded bristle tufts 26 and a feed opening 36 for the bristle tufts. It can be seen that the wall of the scraper 30 in the area around the deformation pin 18 is extremely thin. The intermediate part 38, here in the form of an intermediate plate, may possibly also be movable in order to release the opening for piercing the bent piece of wire 16 only temporarily. The situation in the area of the scraper 30 for this prior art is in FIG. 4 simplified in exploded view. The deformation pin 18 is designed here for example as a cuboid, which should not be understood to be limiting. The wire piece 16 is already bent around the deformation pin 18. The intermediate part 38 has a U-shape adapted to the cross-section of the wire piece 16 (seen in the direction of movement of the stripper 30), the slot width of the opening being only insignificantly greater than the thickness of the wire piece 16. Accordingly, the scraper 30 has an end 42 which has a cross section in plan view, which is also U-shaped and which is also adapted to the wire piece 16 in shape and cross section. The end 42 penetrates when moving the piece of wire 16 in the U-shaped opening 40 a. The scraper 30 contacts the Wire piece 16 along the end face of the end 42 substantially over the entire length of the wire piece 16 through. The disadvantage here is the very filigree geometry of the scraper 30 in the region of its end 42 due to the thin wall of the scraper in this area, but this area is at the same time highly loaded.

The object of the invention is to provide a Bürstenstopfvorrichtung that combines the advantages of this prior art with a lower manufacturing cost and longer life of the device.

This is achieved by a Bürstenstopfvorrichtung according to claim 1.

While in the prior art, the end 42 of the scraper with its end face forms a continuous contact surface for the wire piece 16, the invention proposes to attack on separate protrusions only at separate sections on the wire section, so that the scraper not as in the prior art with his Cross section of the wire shape and wire geometry follows. This makes it possible to design the scraper in the region of the projections thicker and thus to make more stable. In the area (s) between the protrusions which do not have a scraper function, which may not necessarily be the case, the piece of wire can be guided or placed in the intermediate part. Here there is no restriction by the scraper, which must have a certain minimum stability as in the prior art and for the space in the intermediate part, ie in the opening, had to be present in the prior art. The bending part and the scraper are separate parts. The bending part can be moved separately from the scraper and vice versa.

The scraper and the bending part are moved perpendicular to each other in the device according to the invention.

The scraper is also preferably moved perpendicular to the plane of the loop. The wire section will be bent into a U or a U with intersecting webs, ie with two legs and a gutter connecting them, the projections engaging the gutter and the free ends of the legs or, alternatively, only the legs. Hereinafter, such shaped wire sections will be referred to as "sling" for convenience.

The projections are positioned on exactly two opposite sides of the deformation pin and not, as in the prior art, surrounding the deformation pin on almost all sides. On the other sides or at least two other opposite sides of the deformation pin no scraper is provided, more precisely no section of the scraper. Here, according to the opening in the intermediate part can be relatively close to the outer edge of the wire piece to form a good guide.

The scraper has two fingers extending along opposite sides of the deformation pin which form the protrusions.

These fingers do not necessarily have to be single-fingered, they can be coupled together at their opposite end of the tongue, for example, one piece into each other. This means that the fingers are cantilevered in the area of the deformation pin on which the piece of wire rests.

The fingers may have a front side facing the wire whose area corresponds to at least 3 times, in particular at least 10 times, the cross-sectional area of the wire piece in the area of contact with the finger. In other words, looking towards the advancing movement of the scraper, the fingers have an end face which is substantially larger than the cross-sectional area of the wire in the contact area, so that the fingers are made extremely stable. In contrast, in the prior art, the end face of the U-shaped end of the scraper was only minimally larger than the cross-sectional area of the U-shaped piece of wire, which is why the scraper was also relatively unstable.

A further embodiment of the invention provides that the deformation pin has laterally projecting ribs which project laterally outwardly through the stripper. Thus, the deformation pin is stabilized, he has only a relatively short cantilevered end in the area that has contact with the piece of wire.

The scraper looks in a side view, viewed transversely to the direction of movement of the scraper, U-shaped, wherein the two legs of the "U" are formed by the fingers, which merge into one another on the back of the deformation pin.

The task is also solved in a Bürstenstopfvorrichtung of the type mentioned fact that the scraper on his the Wire section facing end side has a guide groove for the tongue. This idea can optionally be coupled with the idea mentioned first, but this is not necessarily the case. This design ensures, on the one hand, that the tongue actually contacts the piece of wire perfectly and not only contacts the edge, and moreover it is possible to widen the wiper or its fingers than the tongue, which makes the wiper more stable again.

The scraper contacts, for example with its front side, the wire pin only outside the guide groove at discrete locations.

The length of the guideway is increased again, if this has a along the guideway extending extension whose length corresponds to at least twice the leg length of the piece of wire. This extension improves the guiding stability of the tongue.

The opening in the intermediate part has, for example, a round or rectangular cross-section, there is consequently no projection in the intermediate part at the edge of the opening which projects into the interior of the opening, so that the opening would have to have a U-shape. The opening in the intermediate part is therefore not a negative of the geometry of the piece of wire (seen in the direction of movement of the scraper), but an envelope of the unit of wire piece and protrusions on the scraper.

Preferably, the deformation pin is stationary and not movable.

The movements of the moving parts can be done by one or more drives, with gears such as cams and rods can be interposed.

By the invention, in which the bending of the piece of wire takes place parallel to the tongue movement in another plane, the device according to the invention runs smoothly. Corresponding cams for the drive can be made less aggressive.

The position and / or the stroke of the scraper can or can be made adjustable. This makes it possible to adjust the position and movement of the scraper to the wire thickness and the thickness of the intermediate part. The wire can namely be of different thickness, depending on the brush, for example in the range of 0.5 to 2 mm. Thus, the position of the scraper in the delivery position must be adapted to the position of the tongue.

The preferred embodiment provides to make the position and / or the stroke of the scraper programmable adjustable, for example via a stepper motor or a servomotor, which is coupled to a controller. Alternatively, this can of course also be done mechanically.

• Figur 1 schematisch eine Bürstenstopfvorrichtung nach dem Stand der Technik,
• Figur 2 schematisch eine andere Bürstenstopfvorrichtung nach dem Stand der Technik,
• Figur 3 die Bürstenstopfvorrichtung nach der US 1 902 113 ,
• Figur 4 eine schematische Ansicht der Bürstenstopfvorrichtung nach Figur 3 im Bereich des Abstreifers und des Deformationsstifts,
• Figur 5 eine schematische Explosionsansicht der Bürstenstopfvorrichtung nach der Erfindung gemäß einer beispielhaften Ausführungsform im Bereich des Abstreifers und des Deformationsstifts bei zurückgezogenem Abstreifer,
• Figur 6 die Bürstenstopfvorrichtung nach Figur 5 bei nach vorne gefahrenem Abstreifer, und
• Figur 7 eine schematische Ansicht einer beispielhaften zweiten Ausführungsform der erfindungsgemäßen Bürstenstopfvorrichtung im Bereich des Deformationsstifts und des Abstreifers.

Further features and advantages of the invention will become apparent from the following description and from the following drawings, to which reference is made. In the drawings show:

• FIG. 1 schematically a brushing device according to the prior art,
• FIG. 2 schematically another brushing device according to the prior art,
• FIG. 3 the Bürstenstopfvorrichtung after the US 1,902,113 .
• FIG. 4 a schematic view of the Bürstenstopfvorrichtung after FIG. 3 in the area of the scraper and the deformation pin,
• FIG. 5 1 is a schematic exploded view of the brushing device according to the invention according to an exemplary embodiment in the region of the scraper and the deformation pin with the scraper retracted;
• FIG. 6 the brush stopper device after FIG. 5 with scraper moved forward, and
• FIG. 7 a schematic view of an exemplary second embodiment of the invention Bürstenstopfvorrichtung in the region of the deformation pin and the scraper.

It should be emphasized that the previously introduced reference numerals are also used in the brush darning device according to the invention, as long as they are identical or functionally identical parts.

The brush stuffing devices in the FIGS. 5 to 7 have substantially the same structure with respect to tongue, Stopfspitze, knife, etc. as in the US 1,902,113 described. In the following, therefore, only the differences will be discussed.

The deformation pin 18 has a pin-shaped end 50, the outer shape of the shape of the wire piece 16, as it should be bent later to a loop adapted. The pin-shaped end 50 extends over the area which is provided for the wire piece 16 and along which the wire piece 16 is moved by the scraper.

The wire feed 15 is again laterally in the direction of arrow A, the shearing and the forming of the wire is carried out as previously with reference to FIG. 2 explained and how in the US 1,902,113 described.

From the frontal, in FIG. 5 opposite to see pin-shaped end 50 has the deformation pin 18 laterally outwardly projecting ribs 52 which extend in opposite directions and have openings 54 for attachment. The deformation pin 18 is cut for example from a plate, so that only the end 50 has the pin shape, but otherwise a plate shape is provided.

The scraper 30 has, seen transversely to its direction of movement B (see FIG. 5 ), a U-shape, with two legs which are formed by cantilevered fingers 56 and which extend on opposite sides of the deformation pin 18. The fingers 56 can run along the preferably flat opposite sides of the deformation pin 18 at a small distance.

The two fingers 56 are coupled together by a web 58, wherein the entire scraper 30 may be formed from a workpiece. The web 58 preferably extends on the side of the deformation pin 18 facing away from the tongue.

The bending part 14 and the scraper 30 are separate parts. The bending part 14 can be moved separately from the scraper and vice versa.

The scraper 30 and the bent part 14 are moved perpendicular to each other in the device.

The scraper 30 is also preferably moved perpendicular to the plane of the loop.

The bending part 14 may in the embodiments of the invention as in the FIGS. 1 to 3 be educated.

As in FIG. 5 can be seen, one of the fingers 56 or both on the wire piece 16 facing end side along the trajectory 10 of the tongue 12 extending extension 60 have.

As FIG. 5 it can be seen, the scraper 56 is provided only on two opposite sides of the deformation pin 18, on two other opposite sides, here in the direction of arrow A, the scraper 30 is not present. He does not contact the wire piece 16 in these areas so.

By the two fingers 56 two spaced-apart projections are formed, which form separate contact points, on its front side, to the wire piece 16.

In the non-limiting embodiment shown, the wiper 30, here its fingers 56, has on its end facing the wire piece 16 a guide groove 62 for the tongue 12. This guide groove 62 acts when, as in FIG FIG. 6 , the scraper has moved in the direction of the tongue 12 and the wire piece 16 has stripped from the deformation pin 18.

The guide groove 62 results in two edges 64 (see FIG. 6 ), with which the end face touches the wire piece 16 at separate contact points.

In the embodiment of the FIGS. 5 and 6 are contact points 70 in the region of the upper finger 56 on the intermediate web 80, which connects the two legs 24 of the wire piece 12 with each other, provided, this area can also be understood as a transition region between the web 80 and leg 24.

Two further, also separate and remote contact points 74 are provided at the free ends 82 of the legs 24 on the lower finger 56.

Compared to FIG. 4 it can be seen that the wiper 30 is made significantly more stable.

The plane defined by the noose is in FIG. 6 the plane that contacts edges 64.

The scraper 30 presses in the position FIG. 6 the loop, ie the piece of wire 16, in the direction of intermediate part 38 and through an opening 40, which is no longer U-shaped here, but rectangular, alternatively round, adapted to the Außenumrandung (envelope) of the tongue 12 facing the ends of the fingers 56th and the piece of wire 16. The piece of wire 16 may be guided laterally, in the region of the legs 82, in the intermediate part 38. The end 50 may protrude almost or into the opening 40.

Of course, the intermediate part 38 may also have a guide groove 62, ie a continuation of the guide groove 62 of the wiper 30, at its end opposite the wiper 30.

To increase the stability of the scraper 30 is provided that each finger 56 a the wire piece 16 facing end face (see FIGS. 5 and 6 ), whose area corresponds to at least 3 times, in particular at least 10 times the cross-sectional area of the wire piece 16 in the direction of movement of the stripper 30, reference being here made to the cross-sectional area of the wire piece 16 in the contact area, ie the contact points 70, 74 with the Fingers 54 is taken.

The extension 60, which defines the guideway in the region of the lower finger 56, has a length (measured in the direction of the guideway axis) which corresponds at least to twice the length of a limb 24 of the piece of wire 16.

Preferably, this is not limited to the embodiments shown, the height of each finger 56 measured in the direction of movement of the tongue 12 is at least 50% of the length of a leg 24 of the piece of wire 16.

In FIG. 7 an alternative embodiment is shown, in which the fingers 56 are elongated plates, which in on the direction A, that is, insertion of the Wire piece 16, opposite sides of the deformation pin 18 are. At the other opposite sides, here the top and the bottom (where "top" and "bottom" refers only to the drawings), the fingers 56 and thus the projections formed by them are not present, so that there is no contact with the Wire piece 16 is provided. In this embodiment, the contact points 76 are therefore present only on the legs 24 of the wire piece 16. It is not the central web or at least not the entire central web 80 contacted, so that in this area the deformation pin 18 may optionally be performed outside the contact area with the wire piece 16 thickened. The dimensions and thicknesses of the fingers 56 are again made correspondingly large, the thickness of the plate-shaped fingers is at least 1.5 times the thickness of the wire, preferably at least 2.5 times, which is not to be understood as limiting.

In addition, the fingers protrude clearly beyond the legs 24 in the longitudinal direction in order to achieve greater stability.

In the illustrated device according to the invention, as in FIG. 2 , The wire piece in a plane parallel to the plane of the tongue 12, that is bent parallel to its guide track 10, so that the deformation of the wire piece 16 during the tongue movement and thus can be done relatively non-time critical.

Preferably, the deformation pin 18 is stationary, that is not designed to be displaceable.

In addition, as in FIG. 6 represented symbolically, the initial and final position of the scraper 30 and / or the stroke of the scraper 30 are adjusted and thus adapted to the thickness of the wire piece 16.

This is done via a controller 86 and a stepping or servomotor 88, which moves the scraper 30 linearly, for example via an interposed mechanism (eg, the lever 90, an eccentric, a spindle, a cam gear, etc.), whereby possibly the transmission / Lever can also be omitted.

The stroke and / or the start and end position of the scraper 30 can, as I said, be adjusted by the motor programmable control, but also quite conventionally by hand via a corresponding adjustment mechanism.

Claims (12)

1. A brush tufting device for tufting and fastening at least one bristle tuft (26) in an opening of a brush body section by means of a loop, comprising:

   a tufting tongue (12) adapted to be reciprocated along a movement path (10) and thrusting bristle tufts (26) along with the loop into the opening,

   a wire feeding means (15) for feeding wire pieces (16) which form loops having two legs (82) and an intermediate web (80) connecting them,

   a bending part (14) adapted to be reciprocated,

   a deformation pin (18) about which the bending part (14) bends the wire piece (16),

   a wiper (30) which is adapted to be reciprocated along the deformation pin (18) and which feeds the bent wire piece (16) to the tongue (12) through an opening in an intermediate part (38),

   the bending part (14) and the deformation pin (18) bending the wire piece (16) in a plane remote from the tongue (12), and the wiper (30) shifting the wire piece (16) laterally into the movement path (10) of the tongue (12),

   the wiper (30) having at least two projections spaced from each other, characterized in that the projections form points of contact (70, 74; 76) with the wire piece (16) which are separate from each other, and in that the wiper (30) has two fingers (56) extending along opposite sides of the deformation pin and forming the projections, the projections engaging the intermediate web (80) and the free ends of the legs (82) or only the legs (82), and the projections being positioned so as to be adjacent to two opposite sides of the deformation pin (18).
2. The brush tufting device according to claim 1, characterized in that two further opposite sides of the deformation pin (18) are free from the wiper (30).
3. The brush tufting device according to either of the preceding claims, characterized in that the fingers (56) are coupled to each other at their ends facing away from the tongue (12).
4. The brush tufting device according to any of the preceding claims, characterized in that the fingers (56) have a face side facing the wire piece (16) and having a surface area corresponding to at least 3 times, more particularly at least 10 times the cross-sectional area of the wire piece in the area of contact with the fingers (56).
5. The brush tufting device according to any of the preceding claims, characterized in that the deformation pin (18) has laterally projecting ribs (52) which protrude laterally outward through the wiper (30).
6. The brush tufting device according to any of the preceding claims, characterized in that on its face side facing the wire piece (16), the wiper (30) has a guide groove (62) for the tongue (12).
7. The brush tufting device according to any of the preceding claims, characterized in that the wiper (30) has an extension (60) extending along the guide path (10) and having a length corresponding to at least twice the length of the legs of the wire piece (16).
8. The brush tufting device according to any of the preceding claims, characterized in that the opening (40) in the intermediate part (38) has a round or angular cross-section.
9. The brush tufting device according to any of the preceding claims, characterized in that the initial and final positions of the wiper (30) and/or the stroke of the wiper (30) are adjustable by motor control.
10. The brush tufting device according to any of the preceding claims, characterized in that the bending part (14) and the wiper (30) are separate parts moving independently from each other.
11. The brush tufting device according to any of the preceding claims, characterized in that the wiper (30) and the bending part (14) can be moved perpendicularly to each other.
12. The brush tufting device according to any of the preceding claims, characterized in that the wiper (30) can be moved perpendicularly to the plane defined by the loop.

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