BE1018928A3 - MACHINE FOR MAKING BRUSHES FOR ROUND BRUSHES. - Google Patents

Abstract

A machine for manufacturing brushes (1) for round brushes (2) which have bristles (7) spirally wound between yarns (6) to a bristle feeder and at least two yarn twisting devices (3a , 3b) which can be positioned between an installation site (4) and at least one treatment and / or ejection site (5) and which can be driven for twisting.

Description

The invention relates to a machine for producing brushes for round brushes which have spiral wound fibers between wires, with a bristle feed device and a wire twisting device.

In the manufacture of round brushes, for example, brushes, interdental brushes or mascara brushes, the bristle filaments are positioned between two wires or both arms of a U-shaped folded wire and are clampingly connected to each other. these wires spinning them. To prevent the pile filaments from being expelled when the threads are turned, the spiral winding speed is limited and so the maximum possible processing speed is also limited.

EP 1 917 886 A1 discloses a method and a device for producing round brushes in which the treatment is carried out in several stations arranged one after the other. In a first step, a preliminary spiral winding in particular takes place at a reduced rotational speed to fix the pile filaments between the threads. Then the round brush is transferred to another workstation and twisting is completed at a higher speed.

As a result, the processing time can be shortened overall. Such a device is however comparatively expensive both in terms of manufacturing and in terms of adaptation to different types of brush.

This is why the problem is to provide a brush making machine of the type mentioned at the beginning which allows a simple and fast spiral winding of pile filaments between the threads and thus a reduced processing time.

The solution according to the invention to this problem consists in that at least two wire twisting devices are provided which can be positioned between a place of installation and at least one place of treatment and / or ejection and which can be driven for twisting.

After placement of the pile yarns and filaments in the first yarn twisting device, the spiral winding movement begins and after the spiral winding, the yarn twisting device is positioned in the processing location and / or subsequent ejection. Here, the round brush can be directly ejected or further treated, for example sheared, so that the length of the filaments can be adapted or the hairs are cut into a desired shape, for example conically or curved. Loss of time due to the movement of the round brush is thus avoided. In addition, no expensive transfer device is required for the round brush in which the pile filaments have previously been spirally wound.

While the round brush in the first wire twisting device is further processed and / or ejected, the wire and bristle filaments for another round brush can already be fed into the second wire twisting device which is then in the place of establishment. Likewise, the spiral winding of pile filaments on the round brush in the second wire twisting device can already begin during the treatment of the first round brush. Simple and fast processing is possible and the manufacturing time for round brushes is reduced.

In this case, it is particularly advantageous that the wire twisting devices can be driven for twisting during the positioning movement between the place of installation and a place of treatment and / or ejection. The spiral winding movement can begin directly after the threads and pile filaments are placed in the first twisting device and as soon as the pile filaments are sufficiently tight to prevent them from falling, the positioning movement to the next place of treatment or ejection begins. During this positioning, the twisting continues so that the spiral winding movement is completed when the wire twisting device reaches the processing and / or ejection location. As a result, the treatment time can be significantly reduced.

It is advantageous that the wire twisting devices are arranged on a rotatably mounted drum. Simple and precise positioning is possible. In addition, it is also possible to provide two wire twisting devices and a corresponding number of subsequent processing stations, which makes it possible to carry out further complex processing operations, in that the wire twisting devices are positioned on the one after the other in the individual workstations.

However, a preferred embodiment provides for two wire twisting devices to be mounted on a drum or similar support device rotatably mounted by 180 °. This support device pivots in one direction and the other by 180 ° instead of a continuous rotational movement.

After placing the yarn and pile material in one of the yarn twisting devices, the yarn twisted 180 ° to shear and, if appropriate, eject and then rotate the opposite direction of rotation. As a result, the supply lines, in particular the power lines for rotating the wire twisting devices and the support device itself, as well as the compressed air hoses for the clamping jaws of the wire twisting, can be connected in a simple manner to the support device. In this case, a 180 ° swivel is no problem for the supply lines, as opposed to a continuous rotational movement for which expensive compensation mechanisms would be necessary.

It is appropriate that the wire twisting devices respectively have two clips spaced from one another to hold the wires and that at least one of the tweezers of a wire twisting device is in rotational drive connection with a motor. This allows a simple and safe seizure of threads on one side and fast and targeted twisting of threads to a desired degree of twisting.

The spiral winding time can be further reduced when the two tweezers of a wire twisting device are respectively rotatably coupled to a motor for rotational movement in opposite directions.

For precise positioning, it is appropriate for the motors to be servomotors.

At the beginning of the spiral winding motion, when the pile filaments are not yet tightly held between the yarns, the spiral winding speed should not be too high, otherwise the filaments can be expelled. To shorten the overall spiral winding time, it is therefore advantageous for a control device to be associated with the motors each time in order to vary the speed. It is thus possible in a first step to work at a lower spiral winding speed until the pile filaments are clamped between the threads. As soon as it is no longer possible for the filaments to fall or slide, the spiral winding speed can be increased.

In this case, it is appropriate that the engine speed can be controlled in accordance with a predetermined or predetermined characteristic curve with a first increasing speed. For example, the rate may increase linearly or in an increasing curve until a maximum rate at which treatment can continue.

If the spiral winding is too fast, the wires could heat up and, as a result, damage the tightly packed filaments. This can be avoided by limiting the maximum speed. To raise the maximum permissible speed, it is advantageous to provide a cooling device for the wire twisting devices. This may include in particular an air blower and / or a spraying device for a cooling liquid. In the simplest case, the supply air can be ambient air, but it is also possible to blow cooled air to obtain a stronger cooling effect.

After having finished twisting the round brush and, if appropriate after the subsequent treatment, the round brush may, by opening darts, fall from the wire twisting device concerned. This can take place in the treatment and / or ejection place or also after pivoting the treated round brush into the place of placement.

If subsequent treatment of the round brush in another downstream treatment device is to be carried out and the round brush is therefore to be transferred to a defined position, a pick-up for the round brush can be provided in the place of establishment. The round brush may be transferred with this picking pinch to a defined position on a treatment device or also on a transport device.

To ensure that the round brushes fall safely and automatically, it is advantageous that the clamps respectively have two clamping jaws which are respectively arranged vertically in the rest position in the place of installation and at least one of treatment and / or ejection.

An exemplary embodiment of a brush making machine according to the invention will be explained in more detail above on the basis of the drawings.

In a strongly schematized way,

Fig. 1 shows a brush making machine with two wire twisting devices and a subsequent processing device,

Fig. 2 shows the progress of the work of the manufacture of brushes,

Fig. 3 and

Fig. 4 respectively show the characteristic curve for the speed of a servomotor driving a wire twisting device.

A brush making machine 1, shown schematically in FIG. 1, for round brushes 2 has two wire twisting devices 3a, 3b which are mounted on a support device not shown so as to be able to pivot (arrow). Pf1) between a place of installation 4 and a place of treatment 5.

At the place of introduction 4, the thread 6 and the pile filaments 7 (FIG. 2) are introduced into the wire twisting device 3a (FIG. 1) that is there. The two wire twisting devices 3a, 3b respectively have two tongs 8 spaced apart from each other with which the wire is held. The clamps 8 are respectively driven by a servomotor not shown, the two clamps 8 of a wire twisting device 3a, 3b rotating in the opposite direction along the arrows Pf2 and Pf3 in Figure 2.

The servomotors are actuated initially at a low speed to prevent expulsion of the individual pile filaments 7. As soon as the pile filaments 7 are securely tightened between the threads 6, the speed is increased and the torsion device of 3a thread rotates during the spiral winding movement about the pivot axis 10 to the treatment location 5. As soon as it is reached, the completed round brush 2 twisted can be treated by a grinding device 9 which is represented only in a strongly schematized way. After this finishing treatment, the round brush 2 can be ejected. For this purpose, the clamps 8 open and the round brush 2 falls or is removed by a not shown gripper.

The second wire twisting device 3b is pivoted towards the place of placement 4 while the first wire twisting device 3a is moved towards the place of treatment. 5. While a round brush 2 which has been twisted is processed at the treatment site, a new yarn 6 and pile filaments 7 are put into place in the other yarn twister 3b on the place of establishment and the spiral winding process begins at lower regime. Then, the support device with the two wire twisting devices 3a, 3b can again rotate in the opposite direction and the treatment cycle is repeated.

Figures 3 and 4 show possible characteristic curves for the speed of the servomotors. The regime n can over time t present, for example, according to Figure 3, a rapid rise with an increasing curve, a comparatively long section at a constant high speed and a rapidly decreasing zone of walking on the road to stop or have, according to Figure 4, a slow and linear rise zone with a short section in the maximum rpm zone before a sloping walking zone.

Due to the spiral winding of the pile filaments during the pivoting movement, the rotation of the two sides in opposite directions with the two servomotors as well as the increasing spiral winding speed, the manufacture of the round brushes can be significantly accelerated.

As a thread for holding the pile filaments 7 by clamping, it is possible to use either two separate yarns or, preferably and as shown in the figures, a substantially U-shaped or hairpin-shaped folded yarn.

Claims (13)

Brush making machine (1) for round brushes (2) having bristles (7) wound spirally between threads (6), with a bristle feeding device and a wire twisting device, characterized in that at least two bristle twisting devices (3a, 3b) are provided which can be positioned between a placing point (4) and at least one treatment and / or ejection point (5). and which can be driven for twisting. Brush making machine according to claim 1, characterized in that the wire twisting devices (3a, 3b) can be driven for twisting during the positioning movement between the placing point (4) and a place of treatment and / or ejection (5). 3. Brush making machine according to claim 1 or 2, characterized in that the wire twisting devices (3a, 3b) are arranged on a rotatably mounted drum. Brush making machine according to one of Claims 1 to 3, characterized in that two wire twisting devices (3a, 3b) are mounted on a drum or similar support device which can rotate by 180 °. Brush making machine according to one of Claims 1 to 4, characterized in that the wire twisting devices (3a, 3b) each have two clamps (8) spaced from one another to hold the wires (6) and in that at least one of the tweezers (8) of a wire twisting device (3a, 3b) is rotatably connected to a motor. Brush making machine according to one of claims 1 to 5, characterized in that the two grippers (8) of a wire twisting device (3a, 3b) are respectively rotatably connected with one another. a motor for a rotation movement in the opposite direction. Brush making machine according to one of Claims 1 to 6, characterized in that the motors are servomotors. 8. Machine for manufacturing brushes according to any one of claims 1 to 7, characterized in that a control device is each time associated with the motors to vary the speed. 9. Brush making machine according to any one of claims 1 to 8, characterized in that the speed of the motors can be controlled according to a predetermined characteristic curve or can be predetermined with a regime first increasing. Brush making machine according to one of Claims 1 to 9, characterized in that a cooling device is provided for the wire twisting devices (3a, 3b). 11. Brush making machine according to claim 10, characterized in that the cooling device has an air blower and / or a spraying device for a coolant. Brush making machine according to one of Claims 1 to 11, characterized in that a pick-up device is provided for the round brush (2) at the treatment and / or ejection point (5). ). 13. Machine for manufacturing brushes according to any one of claims 1 to 12, characterized in that the clamps (8) respectively have two clamping jaws which are respectively arranged vertically in the rest position in the place of implementation. place (4) and at least one of the treatment and / or ejection sites (5).