ES2650384T3 - Transport installation in a brush making machine and procedure for transporting brush parts - Google Patents

Abstract

Transport installation in a brush making machine, with a clamp (30) to be transported for several pieces of brush (28) to be processed successively or bristle housings (70) to be equipped with successive bristles and with a drive servo motor (36 ) for the movement of the fastener (30), to move brush parts (28) or bristle housings (70) towards one and from a processing position, being provided between the actuating servo motor (36) and the fastener (30 ) a step-by-step gear (34), characterized in that a control (100) coupled with the drive servo motor (36) is provided, which progressively starts and brakes the drive servo motor (36).

Description

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DESCRIPTION

Transport installation in a brush making machine and procedure for transporting brush parts

The invention relates to a transport installation in a brush making machine and a method for transporting brush parts.

These types of transport facilities are an autonomous component of a brush making machine and are used to move brush pieces to be processed in a processing position or to supply bristle housings, which are equipped with several bundles of bristles, to The brush parts.

An example of this type of transport installation is a rotating drum as part of a brush insertion machine. In a brush insertion machine of this type they are supplied to a brush piece (for example, to a brush body with a brush handle or to a support piece, in which the bristles are fixed) bristle bundles through A so-called insertion tool. An insertion tool of this type collects bristles as a bundle from a tank and inserts them into a corresponding hole in the brush piece, which has a so-called hole template. The extraction of bristle bundles from the tank and the insertion occur in steps. They are therefore inserted one after another beams of bristles in the brush piece, until all the holes are filled. The brush part in which the bristle arrangement has been completed is then removed by transport and a brush piece without bristles is transported to the processing station.

Modern insertion machines work today with cycle frequencies that until a few years ago still seemed unrealizable, up to 1,000 beams per minute, which are removed and inserted into the holes of the brush piece. This results in cycle frequencies of only 60 milliseconds for removal, supply and insertion of beams.

The transport installation must accompany this cycle frequency, this means that when a brush piece has been completed to be equipped with bristles, the brush piece must still be moved completely without bristles to the processing position within the time which is available for the provision of bristles for two beams that follow one another (cycle time). Only in this way is it ensured that the entire bristle laying machine can always work with the same cadence. This means that the time between two bundles of bristles supplied is always the same, giving the same if the two bundles of bristles supplied successively are supplied to the same brush piece or to different brush pieces as the cycle of the brush pieces continues. Since the brush parts have to be positioned very accurately, but the electric motor needs a certain time to start and brake, only a short time is available for the positioning of the brush piece together with the heavy support. In practice it has been seen that this time is approximately one third to seven eighths of the cadence. Another problem is the movement of the clamp in the so-called X and Y directions. Since the individual holes of a brush piece are provided with bristles in succession, either the insertion tool or the clamp must be moved in a plane , to align the next free hole with respect to the insertion tool. This time is also limited by the cycle time. With a speed of 1,000 insertion processes per minute, there is a time of 52 milliseconds for positioning the fastener together with a brush piece with respect to the insertion tool in the X and Y direction.

From document CH 260 055 A a brush making machine according to the order is known with a drive together with a drive disc and a stepper gear, the drive and the stepper gear being coupled, so that a movement is possible by steps.

From DE 197 02 281 A1 a device is known for processing work pieces, which are in transfer movement. The device comprises a drive servomotor, which is coupled with a stepper gear.

It is the task of the invention to achieve a transport installation with which high cycle frequencies can be achieved. Preferably, cycle frequencies of more than 1,000, as far as possible 1,200 and more insertion steps per minute, should be achieved with the transport system according to the invention.

The transport installation according to the invention in a brush making machine provides for this a support for several pieces of brush to be processed successively or bristle housings to be provided with successively bristles and a drive servo motor for the movement of the clamping, to move brush parts or bristle housings towards one and from a processing position, a step-by-step gear being provided between the drive servo motor and the clamp, with a control coupled with the drive servo motor starting and braking being provided the drive servo motor progressively.

A step-by-step gear of this type transforms a continuous turning movement into an intermittent progressive movement. In the case of an interleaved stepper gear of this type, the slow-acting servo motor can advance, for example, when the position for clamping has already been reached. In addition to this, the engine can

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start earlier before the fastener is set in motion by it. These loss times conditioned by the inertia of the motor and traction chain reduce the positioning time. Through the invention, these loss times are eliminated for the positioning of the fastener, so that there is more time left for the actual positioning. In this way, a positioning time of 52 milliseconds can be maintained with a cycle time of 1,200 cycles per minute. Within this time the next component has to be brought to the positioning position, and within this time the component continues to move in the positioning position by means of an X-Y movement from hole to hole, to arrange successively bristles in these holes. Instead of brush pieces, bristles can also be placed in bristle housings that serve as means of transport (for example, hole plates) and continue to move them forward. The invention provides that a servomotor is used for the drive. This facilitates the control and also gives rise to rapid starting and braking processes, which in combination with a step-by-step gear results in an optimized cadence. It is now possible in particular to load a servomotor up to its speed limit and take it with high speed to the stepper gear phase, in which the stepper gear does not transmit any rotation to the drive shaft.

The step-by-step gear can be further configured in such a way that by at least 120 °, preferably by at least 160 ° of the turning movement of the drive shaft does not give rise to any turning movement of the driving shaft of the transmitting mechanism and with it at this time it deals with a stop of the drive shaft.

The step-by-step gear is preferably configured in such a way that for each rotation of the drive shaft only one gradual movement of the drive shaft occurs.

According to the preferred embodiment, the stepper gear is a so-called Maltese cross gear.

The fastener may preferably be a rotating drum or a linear transport installation. In the case of the rotating drum, one or more brush pieces or brush housings are fixed and rotated on each side, different working steps being assigned to the rotating positions. In this way, a turning position can be provided for the fastening equipment with brush pieces or bristle housings that are still to be provided with bristles, a turning position forming the processing position and another turning position can be provided for the fixation of the bristle bundles by injection or gluing or for the removal of the bristle pieces.

A linear transport installation is also achievable, in which case, for example, fasteners are provided on a linear chain or table, which can move linearly and pass through the processing position.

The fastening is, as already explained, preferably part of a brush insertion machine and houses so-called brush pieces or bristle housings that are to be provided with bristles. These brush parts are either brush bodies, which also comprise the handles, or called support bodies, which have a template of holes such as the brush bodies, which are provided with bristles and then over-injected, to then become in part of the brush. The support body can, however, also be fixed after bristling a handle, sticking or welding with it. The support body is therefore a prefabricated piece that subsequently becomes part of the brush and temporarily carries the bristles that are fixed to it.

It should be stressed that the invention is suitable and is used both for so-called anchor fixations, as well as for fixations without bristle beam anchorage. The anchor fixation is a fixation in which a beam of bristles is bent in a U-shape and at its point of curvature it is fixed in the hole with a small metal insert, which serves as a fastener. The anchor plate penetrates the hole wall. In the case of the technique without anchoring, the bristle beam usually does not bend, but is inserted into the hole with a beam end in front, to then be fixed on the brush piece or support body by gluing, fusion, assembly , welding, overinjection or a combination of several of the mentioned procedures.

The invention also relates also to a brush insertion machine with a transport installation according to the present invention and an insertion tool, which limits the transport installation and inserts bristle beams into the brush piece or in The bristle housing.

The process according to the invention for transporting brush parts or bristle housings in a brush making machine is characterized by the following steps:

- a clamp is provided for several pieces of brush to be processed successively or bristle housings to be provided with bristles successively, the clamp pieces or the bristle housings being successively brought to their processing position and continuously supplied with brush pieces or Bristle housings to the restraint and withdrawing after processing,

- the clamp is advanced progressively by means of a drive servomotor by interleaving a feed mechanism, in particular a Maltese cross gear,

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- the drive servo motor being started again by a control in a progressive manner when the output shaft is still positioned rotatably and the drive servo motor being braked progressively by the control when the output shaft is positioned so spin resistant.

When the drive servo motor is restarted and at that time the drive shaft is still positioned rotatably resistant, the insertion time can be maintained, so to speak, long, and additionally the drive servo motor can accelerate in this phase, so that after insertion it will carry out with its already high turning speed, the continuation of the cycle. The same advantage also results in the braking of the drive servo motor, that is, the drive servo motor can still brake and rotate while the drive shaft is already stopped and the processing process can already begin.

Preferably, the clamp moves during insertion between individual cycles in a plane to align the holes to be filled with respect to the insertion tool.

The method according to the invention further provides that the brush pieces or the bristle housings are moved in such a way by means of fastening in an insertion machine that the delivery time of one brush piece to the next corresponds to the cycle time when inserting beams.

The method according to the invention also preferably provides that a cycle time of at least 1,100 beams of bristles to be inserted per minute is provided.

When the drive servo motor is restarted and at that time the drive shaft is still positioned rotatably, the time for insertion can be kept so to speak, shortly, and additionally the drive servo motor can accelerate in this phase. so that it carries out after the insertion with an already high turning speed, the advance of the cycle. The same advantage also results in braking the drive motor, that is, the drive motor can still rotate and brake, while the drive shaft is already stopped and the processing process has already begun.

Using the combined use of a servomotor and a step-by-step gear the cycle time of the transport system can be adjusted regardless of the duration of the movement of the clamp.

Other features and advantages of the invention result from the following description and the following drawings, to which reference is made. In the drawings they show:

- Figure 1, a schematic perspective top view of a brush insertion machine according to the invention with transport installation according to the invention as part of a brush making machine;

- figure 2, an enlarged view of the transport installation in the stepper gear area according to figure 1 as the cycle progresses;

- figure 3, an enlarged view of the transport installation according to figure 1, in which the drive shaft is stopped;

- Figure 4, a second embodiment of the brush insertion machine according to the invention;

- Figure 5, a third embodiment of the brush insertion machine according to the invention; Y

- Figure 6, a sectional view of a rotating drum with a clamp and a brush part according to a fourth embodiment of the brush insertion machine according to the invention.

In figure 1 a station of a brush making machine is shown schematically, in particular the so-called brush insertion machine. In this case it is a toothbrush manufacturing machine.

The insertion machine has several installations, namely a transport installation 10, an insertion tool 12, a beam separator 14 for bristle beams, as well as a reservoir 16, in which bristles 18 are housed vertically and in a disorderly manner . These bristles 18 are prestressed in the direction A towards the beam separator 14 in the form of a circular arc.

The beam separator 14 comprises a circular arc 20 that can be reversibly rotated that has a housing notch 22 for a bristle beam on its outer perimeter.

The insertion tool 12 is provided with a tip 24 that bends the U-shaped bristles 18 and is supplied through a carriage 26 in the Z direction towards brush parts 28 to be provided with bristles. Anchor plates not shown anchor the beams 18 on the brush piece 28.

The brush parts 28 are arranged in a holder 30 as part of a drum 32 that rotates progressively. The drum 32 is coupled through a stepper gear 34, in this case in the form of a

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Maltese cross gear, with an electric drive motor 36, which is configured as a servomotor. The drive motor 36 is controlled through a control 100 in a reliable and accurate manner and allows rapid start and brake processes.

The drum 32 with its only four fasteners 30 in the presented embodiment example can progressively progress at a rate of respectively 90 °. This results in four positions for the drum 32 and the brush parts 28 fixed thereto. In the upper position in Fig. 1 (12 o'clock position), brush pieces 28 without bristles are supplied either to the drum 32 and together with the clamp 30, on which they are attached or fastened to the clamp 30 fixedly fixed to the drum 32

In the position directed in the direction of rotation towards the insertion tool 12 (3 o'clock position) the brush piece 28 is inserted, in the 6 or 9 o'clock position the brush pieces 28 with bristles are removed from the installation of transport 10. This results in permanent equipment and evacuation of brush parts 28, which results in a rapid cycle time.

Hereinafter, the operation mode of the brush making machine according to Figure 1 is briefly explained. The beam separator 14 rotates in relation to the starting position of Figure 1, to the left, so that the notch of housing 22 is aligned with the outlet opening 38 of the reservoir 16 and the bristles are pushed into the notch 22. The bristle beam 18 formed by filling the notch 22 moves clockwise to the right via the separator of beams 14 that rotates, towards the tip 24, which until then had been moved somewhat backwards (in the negative Z direction). The beam 18 is then folded and inserted under pressure by means of the tip 24 with an anchor plate in an opening in the head of the brush piece 18. Because of this the insertion tool 24 retracts again. Meanwhile the circular arc 14 has already removed a new beam and is available for new equipment of the insertion tool 12.

In order for the next bundle of bristles 18 to be aligned with the next free hole assigned in the brush piece 18, the entire transport installation 10 or only the drum 32 or the insertion tool 12 is moved on a carriage XY 39 (see X and Y axes in Figure 1). This positioning through the X-Y 39 car lasts only approximately 52 milliseconds, although 1,200 beams per minute are supplied continuously.

As soon as the brush piece 28 is completed with bristles, the drum 32 continues to rotate and specifically within the cycle time of the insertion tool 12.

This continuation of extremely fast and exact cadence is caused mainly by the combination of stepper gear 34 and electric motor 36, in particular also by the servomotor.

In figures 2 and 3 the stepper gear can be seen more accurately. The drive shaft 40 of the motor 36 is in this case displaced laterally with respect to the output shaft 42, which is rotatably coupled with the drum 32. With the drive shaft 40 a cam disc 41 is coupled with a first section 44 in the form of a circular arc, which extends over more than 120 °, in the present example 180 °, and a second section 46. The second section 46 comprises two cavities 50 in particular concave, which extend towards a radial tooth 48. This tooth 48 is configured in such a way that it can be engaged between two adjacent axial projections 52 of several projections 52 (in this case four) to a disk 54, which is resistant to rotation together with the output shaft 42. The projections 52 are provided in the present example of bushings 56 rotatably housed, which have to reduce friction.

The protrusions 52 may in general be referred to as spike-shaped protrusions.

When the tooth 48 penetrates between two projections 52, it transmits a turning moment to the output shaft 42, as soon as it comes into contact with a projection 52 and displaces it. The projection 52 then moves to the anterior flank of the tooth 48, that is, along the concave cavity 50. As soon as the tooth 48 is no longer engaged with the projection 52 assigned, the output shaft 42 continues advanced at the rate of one step.

As can be seen above all in Figure 3, the tooth 48 protrudes radially outwardly more than section 44. As soon as the tooth 48 has continued to rotate the projection 52, with which it has been engaged, and no longer is hooked with it, the second section 44 engages with its perimeter surface 60 with two projections 52 arranged next to each other (see Figure 3.). In this position, in which two projections 52 come into contact with the surface 60, the output shaft 42 and the drum 32 are positioned rotatably. In this position, so to speak, a cycle has ended, and the bristles 18 move towards the brush pieces 28. The surface 60, so to speak, moves below the bushings 56, which rotate.

The stepper gear 34 thus holds the fasteners 30 fixed in their position and progressively transports them to the next processing position. The coordination of the length measured in angular degrees, of section 44, determines together with the number of revolutions of the engine 36 the residence time in the processing or resting position. By continuing to rotate the drive shaft 40, the tooth 48 is finally engaged with the lower right shoulder 52 in Figure 3 and rotates it at a clockwise cycle in a clockwise direction.

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The procedure for automatic transport of the brush parts 28 provides for the electric motor 36 to start and brake again. The electric motor 36 functions in this way as a stepper motor. In this way, any proportion of the cycle times of the insertion machine and of the transport installation can be realized, in particular when a brush piece has a plurality of bristle bundles.

The electric motor 36 configured as a servomotor enables rapid starting and braking procedures and a high number of revolutions, due to which a reduced positioning time itself is possible. By means of the intermediate switching of the step-by-step gear 44, the positioning time can be shortened as well as the accuracy of the transport installation can be increased.

The positioning time can be shortened in particular because the movement of the electric motor 36 is not transmitted to the drive shaft during the acceleration phase and / or the braking phase through the stepper gear 34. The stepper gear this allows the drive shaft to move during the entire positioning movement with the desired speed, preferably maximum.

The step-by-step gear 34 further blocks a movement of the drive shaft while a toothbrush is fully provided with bristles. In this way, unwanted movements of the electric motor 36 cannot be transmitted to the drive shaft during the equipment. In this way, the exact movement and position of the electric motor can be disregarded, for example when braking, without reducing the accuracy of the positioning.

The start occurs at a time when the tooth 48 has not yet engaged with the following extension 52, so that the acceleration time does not reduce the cycle time. Start-up occurs even while the insertion tool 12, more precisely said, the tip 24, is removed from the brush piece 28 fully equipped with bristles or, referring to the following embodiments, of the bristle housing 70, for accommodate the next beam 18.

In addition, braking and dragging occur in a phase in which the tooth 48 is no longer engaged with the projection 52 that has just moved, which is positive for the cycle time and the residence time in The processing position. The braking occurs preferentially when the output shaft 42 is positioned rotatably, that is, when the perimeter surface 60 acts as the force output side.

Due to the long residence time in the processing position, the processing movements in X and Y movement can also have a relatively long duration.

In figures 2 and 3, unlike the embodiment according to figure 1, there is also connected a decoupling installation 53 between the clamp 30 and the stepper gear 34, which transmits the turning moment, allows without However, a relative movement of the clamp 30 in relation to the fixed step-by-step gear 34 in the X and Y direction. In this way the carriage 39 has to move in this case only the drum 32 together with the clamps 30, not however the transmission mechanism 34 and engine 36. The decoupling installation 53 is for example a transmission shaft and / or a telescopic shaft.

The second embodiment of Figure 4 differs from the one mentioned above in that the fasteners 30 are on a chain or a linear table and are progressively transported in the X direction. The step-by-step gear 34 comprises a kind of sprocket 64 that engages between adjacent projections 52 and transports them in the X direction. The projections 32 are fixed components of the chain or linear table.

In the embodiment shown, the brush parts 28 are called brush bodies, that is, injected plastic parts, preferably already with the handle, which are then usually needed.

After removing the brush pieces with bristles, they can then continue to be processed. Alternatively, the bristle bundles 18 are glued or welded on the back side, when working without anchoring.

Instead of the brush bodies, they can also be transported and provided with bristles, but also insert support bodies in the fasteners. These support bodies are then integrated into a subsequent station, in which the brush body is injected, into the brush body. Or the support bodies are joined with prefabricated handles, in particular they are welded.

Another transport installation is shown in Fig. 5. In this embodiment called bristle housings 70, also called hole plates, are either part of the fastener 30 or are arranged in the fastener 30. The hole plates 70 have a hole template, which corresponds to the hole template of the brush piece 28. These hole plates 70 are equipped with bristles completely in the insertion machine and then move towards the assigned brush piece 28, to introduce in one step all the beams in the brush piece 28. In this way the hole plates 70 are temporary supports for a set of bristle bundles.

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Also these hole plates 70 progressively cycle through the transport installation. Instead of linear movement, this type of hole plates can naturally also be transported on a drum 32, as shown in Figure 1.

Hole plates 70 form bristle housings, which form temporary storage and transport pieces with the template of brush holes to be produced later.

Since in the rest position on the force output side all parts are positioned and fixedly held by the stepper gear 34, a high positioning accuracy of 0.005 to 0.01 mm results.

The servomotor 36, which by means of the step-by-step gear 34 can operate in dead gear or advance, is regulated in such a way that it can carry out its maximum acceleration, since the vibrations or the movement by inertia have no negative consequences for the time of repose.

A sectional view of an embodiment of a rotating drum 32 with a clamp 30 and a brush piece 28 is shown in figure 6. Instead of performing the 90 ° rotation in a single step, it is divided in this case in three individual steps: a rotation occurs first at a rate of 10 °, then at a rate of 70 ° and again at a rate of 10 °. In this way it is advantageously achieved that not all beams of bristles 18 are arranged parallel in rows, but that in the brush piece 28 they present, for example, beams of bristles arranged by the edge at an angle of 10 ° with with respect to the adjacent beam.

The step-by-step gear is therefore configured such that it inclines the brush part 28 or the hole plates 70 with respect to the supply direction Z of the supplied bristle brush 18, to be inserted into the brush part 28 or in the hole plate 70 beams of bristles 18 with inclined orientation.

Claims (13)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 60 65 REIVIN DI CATIONS 1. Installation of transport in a machine of manufacture of brushes, with a subjection (30) to transport for several pieces of brush (28) to process successively or housings of bristles (70) to equip with bristles successively and with a servo motor of drive (36) for the movement of the fastener (30), to move brush parts (28) or bristle housings (70) towards one and from a processing position, being provided between the actuating servo motor (36) and the fastener (30) a step-by-step gear (34), characterized in that a control (100) coupled with the drive servo motor (36) is provided, which progressively starts and brakes the drive servo motor (36). 2. Transport installation according to claim 1, characterized in that the stepper gear (34) is configured such that it does not give rise to at least 120 °, preferably at least 160 °, of the turning movement of the drive shaft ( 40) to no turning movement of the output shaft (42). 3. Transport installation according to one of the preceding claims, characterized in that the step-by-step gear (34) is configured such that for each rotation of the drive shaft (40) only one gradual movement of the output shaft ( 42). 4. Transport installation according to one of the preceding claims, characterized in that the stepper gear (34) is a Maltese cross gear. 5. Transport installation according to one of the preceding claims, characterized in that the clamp (30) is part of a rotating drum (32) or of a linear transport installation. 6. Transport installation according to one of the preceding claims, characterized in that the fastener (30) is part of a brush insertion machine and houses brush parts (28) to be equipped with bristles or bristle housings (70). 7. Brush insertion machine with a transport installation (10) according to one of the preceding claims, characterized in that the insertion tool (12) is provided so that it limits the transport installation (10) and inserts bundles of bristles (18) in brush pieces (28) or bristle housings (70). 8. Procedure for automatic transport of brush parts (28) or bristle housings (70) in a brush making machine, characterized by the following steps: - provide a clamp (30) for several brush pieces (28) to be processed successively or bristle housings (70) to be provided with bristles successively, the clamp pieces (28) or the bristle housings (70) holding the clamp successively to a processing position and continuously supplying brush pieces (28) or bristle housings (70) to the fastener (30) and withdrawing from it after processing, and - progressive movement of the fastener (30) by means of a drive servo motor (36) by interleaving a stepper gear (34), in particular a Maltese cross gear, - the drive servo motor (36) being started again by a control (100) in a progressive manner when the output shaft (42) is positioned rotatably and the drive servo motor (36) is braked by the control (100) progressively when the output shaft (42) is positioned rotatably. Method according to claim 8, characterized in that the brush parts (28) or the bristle housings (70) are moved by means of the clamping (30) in such an way in an insertion machine that the time of change of a piece of brush (28) or of a housing of bristles (70) to the following one corresponds at most with the cycle time when inserting beams (18). Method according to claim 8 or 9, characterized in that the stepper gear (34) positions the clamp (30) in the fixed position in the processing position. Method according to one of claims 8 to 10, characterized in that the actuating servo motor (36) starts again when the insertion tool that supplies the bristles (18) is removed from the brush piece (28) equipped with bristles. or of the bristle housing (70) equipped with bristles. 12. Method according to one of claims 8 to 11, characterized in that during the installation with bristles of a brush piece (28) or of a bristle housing (70), the stepper gear (34) adopts different angular positions for inserting bristle bundles (18) at different angles in the brush piece (28) or in the bristle housing (70). 13. Method according to one of claims 8 to 12, characterized in that the cycle time of the transport installation can be adjusted independently of the duration of the movement of the fastener (30). 8