Patent Application
20090101065
The invention relates to an apparatus for the flocking of articles, in particular of textile materials, mats, ceramics, plastics, paper, wood, metal or the like.
In the coating industry, in particular the flock industry, various plants are already in use which make it possible to apply flock material to an adhesive-wetted surface of an article. Preferably short fibres, in particular textile fibres, are employed as flock material. By means of an electrostatic charging of fibres received in a container, the flock material is expelled and applied to the article to be flocked. In particularly DE 196 22 230 A1 discloses a flocking apparatus consisting of a plurality of planting units which are assigned in each case to a pallet arranged on a pallet carrier. The pallet carriers are provided on a rotary drive which transports the article arranged on the pallet from processing station to processing station. Above the pallet, in addition to a plurality of printing units, a processing station with a flocking container is provided, which applies textile fibres to the article. The flocking apparatus provided for this purpose is also used for the manual flocking. In such apparatuses, only single-colour flocking is carried out.
Owing to modernization and the increase in flexibility for the production of flocking designs, there is now the requirement that different colours and fibre lengths and/or different flock materials have to be used and processed. For this purpose, it is necessary for a plurality of processing stations to be provided in succession. In each processing station, a flocking apparatus is provided which applies a predetermined part of a flocking design to the article. For each part of the flocking design, a stencil is provided in a stencil frame which is to be aligned with the pallet assigned to the flocking apparatus. On the stencil, at least one setting mark is provided which, in order to apply part-designs, is congruent in all the stencils when these are laid one above the other. As a result, the flocking designs to be applied successively are aligned so as to be directly contiguous to one another. For this purpose, an exact setting of the stencil frames having the respective flocking design is required. This makes it necessary to remove the flocking apparatus from the processing station and return it again several times, in order to make it possible to set the stencil frame after the removal of the flocking apparatus from the processing station. The handling of the flocking apparatus, because of its weight, is scarcely possible for an operator alone and requires additional assistance. Furthermore, such manual handling is time-consuming and inefficient.
The object on which the invention is based, therefore, is to provide an apparatus for the flocking of articles, in particular textile materials, which allows a rapid and exact setting of stencil frames in the case of the flocking design which involves one or more flocking operations.
This object is achieved, according to the invention, by means of the features of claim 1. Further advantageous refinements and developments are specified in the further claims.
The apparatus according to the invention makes it possible to have simple and rapid access to a stencil frame having a flocking design, in that the flocking device is lifted off at least partially upwards with respect to the stencil frame. For this purpose, an actuating device is provided which can be activated mechanically and thus makes it possible at least partially to lift off the flocking device with respect to a frame to which the stencil frame is fastened. This affords the operating personnel, without physical effort, with rapid access to the stencil frame, in order to align the latter for a flocking design exactly with a setting mark of a preceding stencil frame.
According to a preferred refinement of the invention, there is provision for the flocking device to be mounted pivotably about an axis of rotation which is arranged between the vertical axis of the central column and an outer frame portion of the frame carrier, so that the flocking device can be lifted off upwards to a frame portion which is outer radially to the axis of rotation. As a result, by means of a simple pivoting movement about the axis of rotation, a lift-off of the flocking device can be provided, so that good access is provided for setting the stencil frame which is fastened to the frame held by the frame carrier. Good access from outside is thereby made possible, so that the user is enabled to set the stencil frame outside the circular path formed by the rotary position of the pallet carriers, in that, after the flocking device has been lifted off, a simple inspection from outside and from above is made possible.
According to a first alternative embodiment of the apparatus, there is provision for the flocking device to be arranged pivotably about an axis of rotation provided on the frame and for the axis of rotation preferably to be oriented tangentially to the circular path, so that the flocking device can be lifted off upwards in the direction of the vertical axis. This, in turn, makes it possible that the stencil frame can be observed outside a working range of the apparatus for the flocking of articles. This direct tie-up of the flocking device via an axis of rotation on the frame makes it possible to have a structurally simple and weight-saving arrangement.
According to an alternative embodiment of the invention, there is provision for there to be provided on the frame or frame carrier a carrying arm which is pivotable about an axis of rotation and on which the flocking device is arranged and which is pivotable upwards about this axis of rotation, so that the stencil frame is easily accessible outside the working range of the pallet. The carrying arm is preferably arranged on a radially inner frame portion or frame carrier, so that the flocking device is lifted off with respect to the radially outer frame portion.
According to a preferred refinement of the alternative embodiment, the flocking device is provided releasably with respect to the carrying arm. A simple change of the flocking device on the carrying arm is thereby made possible, so that the flocking apparatus can be converted quickly to a new flocking design, in that, for example, a further flocking device with a differently coloured flock material or with another type of flock material and/or another fibre length can be fastened to the carrying arm.
According to a further preferred refinement of the invention, there is provision for the actuating device to comprise at least one working cylinder which acts, with respect to the axis of rotation about which the flocking device is pivotable, on the radially outer region of the flocking device or the carrying arm carrying the flocking device and which, on the opposite side, can be fastened to an articulation apparatus which is arranged on a lifting pillar of the central column. The advantage of this arrangement is that the previous construction of the apparatus for the flocking of articles can be preserved and, optionally, an additional mounting of an automatic or mechanically activatable actuating device for the simple lift-off of the flocking device with respect to the stencil frame is made possible. Alternatively to the working cylinder, further motor-activatable arrangements may be provided which allow a shortening of the distance between the articulation apparatus and a point of action on the flocking device or the carrying arm. For example, a rope winch or a chain drive may be provided. Furthermore, electromotive drives, rack drives or the like may also be used.
According to a further preferred refinement of the invention, there is provision for the articulation apparatus to have a ring arranged concentrically to the vertical axis and having a plurality of mounting plates to which a working cylinder can be fastened. The articulation apparatus is preferably carried by a lifting pillar of the central column. This articulation apparatus can be attached in a simple way in order to receive the working cylinder so that an actuating device is formed.
This articulation apparatus preferably comprises a mounting plate for each processing station, so that one or more flocking stations can be equipped with the actuating device as a function of the equipment requirements of the flocking machine.
According to a further advantageous refinement of the invention, there is provision for the carrying arm receiving the flocking device or the flocking device arranged pivotably on the frame to be pivotable out of the working position through at least 15°. This makes it possible to inspect the stencil frame from a region outside the working range of the pallet carrier. Furthermore, a visual check of the lower outlet side of the flocking device can become possible.
According to an alternative embodiment of the actuating device for at least partially lifting off the flocking device, there is provision for at least one working cylinder to act on the frame and with its opposite end to act on the flocking device or the carrying arm, in order to lift off the latter upwards. In this case, the carrying arm or the actuating device is pivoted about an axis of rotation which lies between a radially outer frame portion and the vertical axis of the central column and which is preferably formed on an inner frame portion of the frame which, in particular, is adjacent to the frame carrier.
The at least one working cylinder arranged on the frame acts preferably on a lever or lever mechanism which is arranged between the frame and the flocking device or the carrying arm receiving the flocking device. Additional lever assistance can thereby become possible, in order with low forces to allow an at least partially upward-directed lift-off of the flocking device.
According to a further advantageous refinement of the actuating device, at least two lifting cylinders arranged on the frame are provided, which lift off the flocking device with respect to the frame and hold the flocking device oriented parallel to the latter. For example, two lifting cylinders lying opposite one another may act on the frame, on the one hand, and on the flocking device, on the other hand, and carry out a raising and lowering movement.
According to a further advantageous refinement of the actuating device with at least two lifting cylinders, there is provision, additionally, for at least one guide to be provided, in order to avoid a tilting of the flocking device when only two lifting cylinders are used. Preferably, four lifting cylinders are provided, so that a parallel raising and lowering with respect to the stencil frame are made possible in each corner region or near each corner region.
According to a further advantageous refinement of the actuating device which comprises at least two lifting cylinders arranged on the frame, there is provision for the lifting cylinders to be telescopic. Thus, if the set-up height is low, a high lift-out height becomes possible, in order to achieve good access to the stencil frame.
Further advantageous refinements and developments are specified in the further claims. In the drawing:
Above the revolving stage 16 is provided a baseplate 21, on which frame carriers 22 are provided in the form of a star in a similar way to the pallet carriers 18 and in each case carry a frame 23 at their free outer ends. The frame 23 has holding elements 24 which are preferably provided with quick-action clamping elements, not illustrated in any more detail, in order to receive a stencil frame 26 of a stencil 25 having a flocking design in a quickly exchangeable way.
After a rotational movement for transferring the pallet 19 into a working position below the frame 23, the central column 14 executes a lifting movement, in order to transfer the article carried on the pallet 19 into a working position with respect to the stencil frame 26. Alternatively, the frame may also be lowered with respect to the pallet carrier.
On the frame 23 is arranged a rotary bearing 28 which receives a carrying arm 29 pivotably. This rotary bearing 28 is provided on the frame carrier 22 or an inner frame portion 31 which is arranged near the vertical axis 17 or is offset inwards with respect to a radially outer frame portion 32. This rotary bearing 28 may be formed by a flange plate 33 in which a shaft 34 is mounted pivotably. This rotary bearing 28 therefore has an axis of rotation 35 which is oriented tangentially to the circular path along which the pallet carriers 18 are guided when a plurality of processing positions predetermined in steps are assumed. The carrying arm 29 preferably extends along the frame 23 as far as the outer frame portion 32. On an underside of the carrying arm 29, a holding device 36 is provided which receives a flocking device 37. This holding device 36 preferably likewise comprises quick-action clamping elements, so that the flocking device 27 can be mounted and demounted quickly. A rapid and simple change of the flocking devices 37 can thereby be achieved, in order, for example, to make it possible to use a differently coloured flock material and/or another flock length and/or another type of flock material.
The flocking device 37 comprises a flocking container 38 which is preferably formed from transparent material, in particular transparent plastic. An electrically conductive fabric for the outlet of the flock material is provided on an underside of the flocking container 38. In the flocking container 38, one or more applicator elements, in particular applicator brushes, are assigned to the fabric 39 and can be moved to and fro above the fabric 39. Furthermore, in the flocking container 38, an electrode is provided which charges the flock material electrostatically for the expulsion of the latter.
Above the frame 23, a control unit 41 for the flocking device 37 is provided, in order to apply a high voltage during flocking and supply the electrode.
This processing station 12 comprises, further, an actuating device 43, in order to pivot the carrying arm 29 upwards about the axis of rotation 35, as illustrated in
The frame carrier 22 or the frame 23 comprises a supporting element 51 or a supporting angle 51 which in each case engage on or near the inner frame portion 31, these supporting elements being connected to an upper end of the lifting pillar 48 by means of struts 52, so that such a framework makes it possible to have a stable and rigid arrangement of the frame 23 with respect to the central column 14 of the apparatus 11. Furthermore, arranging the working cylinder 44 above the struts 52 makes it possible to generate a counterforce via the struts 52 during a lifting-off or lowering movement of the flocking device 47, so that a distortion-resistant and inherently stable arrangement is provided.
The articulation device 47, which may preferably likewise be a component of the actuating device 43, comprises a peripheral ring 56, on which a plurality of mounting plates 57 are arranged, in order to fasten the working cylinders 44 to them. Preferably, each mounting plate 57 is assigned to a processing station 12. This articulation device 47 is arranged above the lifting pillar 48. The previous set-up of a processing station can thereby, in principle, be preserved.
After adhesive has been applied to the article, the pallet 19 is lowered by means of the central column 14. The pallet 19 is clocked on into the next rotary position and is subsequently raised again. In this following processing station 12, a first flocking material is applied to the article. For this purpose, a high voltage is applied in the flocking container 38 and the applicator brushes are moved to and fro. The article is provided at a defined and exactly set distance 59 from the stencil frame 26 (
After the flock material has been applied in the first processing station 12, the partially flocked article is clocked on to a second processing station 12. A further flock material is applied in this processing station 12. This further flocking material may have a different fibre length, colour and/or type of material. Subsequently, as a function of the selected flocking design, one or more further processing stations 12 may be provided. After the completion of the flocking design, a processing station 12 is formed as a drying unit. Following this, a processing station 12 is provided in order to extract the flocked article from the pallet 19.
In the case of flocking designs with a plurality of processing steps because of the use of different colours, fibre lengths or flocking materials, it is necessary that the stencils must in each case be coordinated with one another, so that the part-designs can be applied exactly in order to ensure exact transitions of the individual flocking regions consisting of different flocking materials or colours. So that the setting of the stencil frame 26 or of the setting marks arranged on the stencil is made possible in a simple way, the flocking container 37 must be lifted off with respect to the frame 23, so that the setting mark on the stencil is visible. This setting mark must be set congruently to a setting mark of the stencil which is provided in the first processing station 12. Such setting operations usually have to be carried out several times for the exact set-up of a new flocking design, and therefore it is necessary for the flocking device 37 to be lifted off several times. By the actuating device 37 being configured according to the invention, simple handling is made possible. The upward pivoting of the flocking device 37 about the axis of rotation 35 affords rapid and easy access. At the same time, the flexibility of the apparatus 11 is maintained, since the flocking device 37 is received on the carrying arm 39 via the holding device 36 so as to be exchangeable in a simple way. The actuating device 37 can also make it easier to set up a flocking design by means of only one flocking operation in coordination with the application of an adhesive layer.
In so far as a flocking device 37 is not required in the processing station 12 in the case of a flocking design to be newly set up there may preferably be provision, further, for applying a magnetic foil to the fabric 39 on the flocking container 38, so that the flocking container 38 is closed from below and can remain in the processing station 12, without soiling occurring during the step-by-step clocking-on of the pallets 19 into the predetermined rotary positions by means of the central column 14. In so far as the processing station 12 is to be used again, such a magnetic foil is removed.
An alternative embodiment to the actuating device 37 illustrated in
An alternative embodiment of the actuating device 43 is provided in
A further alternative embodiment of an actuating device 43 is provided in
By raising and lowering the flocking container 38 in parallel, if two lifting cylinders lying opposite one another are used, a guide is preferably provided additionally, arranged parallel to these, in order to prevent tilting. Alternatively, instead of the additional at least one guide or even additionally, at least one further lifting cylinder may also be provided. So that a sufficient lift for lifting off the flocking container 38 with respect to the frame 23 is made possible, the lifting cylinders are preferably designed telescopically.
| Number | Date | Country | Kind |
|---|---|---|---|
| 20 2007 012 699.9 | Sep 2007 | DE | national |
| 20 2007 012 745.6 | Sep 2007 | DE | national |
