WO2011042141A1

WO2011042141A1 - Cutting device for a cigarette-rod machine in the tobacco-processing industry, and method for producing the cutting device

Info

Publication number: WO2011042141A1
Application number: PCT/EP2010/006041
Authority: WO
Inventors: Wolfgang Ackermann; Torsten Baustian; Bernhard Brinkmann; Dietmar Janz; Michael Lüneburg
Original assignee: Hauni Maschinenbau Ag
Priority date: 2009-10-09
Filing date: 2010-09-30
Publication date: 2011-04-14
Also published as: DE102009049657A1

Abstract

The invention relates to a cutting device (10) for a cigarette-rod machine in the tobacco-processing industry, comprising a blade carrier (11) with at least one blade holder (12), also comprising a drive (29) for driving the blade carrier (11) in rotation, wherein the blade carrier (11) and the drive (29) are assigned to a cutting head (13) which is designed such that it can be adjusted relative to a fixed-location pivoting table (14) which is adapted for fastening on an external frame (15) or the like of the cigarette-rod machine, additionally comprising a drive unit (16) for automatically adjusting the cutting head (13) relative to the pivoting table (14), and further comprising means (17) for fixing the position of the cutting head (13) in relation to the pivoting table (14), the cutting device being distinguished in that the drive unit (16) itself is the means (17) for fixing the position of the cutting head (13) in relation to the pivoting table (14), and a floating mount is provided between the cutting head (13) and the pivoting table (14). The invention also relates to a corresponding method for adjusting the cutting device on-line.

Description

Cutting device for an extrusion machine of the tobacco processing industry and method for adjusting the cutting device

description

The invention relates to a cutting device for a strand machine of the tobacco processing industry, comprising a knife carrier with at least one

Knife holder, a drive for rotatably driving the knife carrier, wherein the knife carrier and the drive are associated with a cutting head, relative to a fixed, for attachment to an external frame or the like

Strangmaschine adapted swivel table is adjustable, a

Drive unit for automatic adjustment of the cutting head relative to

Swing table, as well as means for fixing the position of the cutting head relative to the turntable. Furthermore, the invention relates to a method for adjusting a cutting head formed from a knife carrier and a drive with respect to a pivoting table in a cutting device of a tobacco industry rod maker comprising the steps of: releasing means for fixing the position of the cutting head relative to the rotary table, adjusting the position of

Cutting head relative to the pivoting table by means of a drive unit, fixing the position of the cutting head relative to the pivoting table by the means for

Fix.

Such cutting devices and methods are used in the tobacco processing industry. In particular, such cutting devices are in

Integrated stranding machines. In the stranding machines, the strands of tobacco, filter material or other stranded materials are cut into strand sections. However, there is a need to work with one

Stranding machine and in particular a cutting device to cut different lengths of the strand. In other words, each stranding machine and thus also each cutting device must be adjustable in such a way as to allow strand pieces or To cut strand sections of different lengths from the strand. Usually in this context one speaks of a format change which requires an adaptation of the position / position of the cutting device to the strand. In known cutting devices, the format change or the adjustment can be performed manually, for example by means of a spindle or the like or

be executed. By means of the spindle, the displacement angle of the cutting head is varied, so that the position of the cutting head changes to the strand. Other

Cutting devices have to automate the adjustment of the cutting head relative to the pivot table in particular for format adaptation to a drive unit. In all cases, however, the position of the cutting head to the pivoting table must be fixed in order to prevent an undesirable change in position, for example, by vibration, vibrations or the like, during cutting. To fix the setting or the adjusted position of the cutting head relative to the pivot table known mechanical clamping elements are used.

Usually two to four screws are used for fixation. The disadvantage, however, on the one hand, that the effort to loosen and fix again at a

Format change is very high. On the other hand, there is a risk that the position in the period between the adjustment or adjustment on the one hand and the fixing on the other hand changes again and / or fixing, so the determination of

Clamping elements, even for changing the exact position leads, which is unacceptable in view of the necessary accuracy of the position.

The invention is therefore based on the object, a structurally simple

To provide cutting device with a high positioning accuracy for the cutting head. Furthermore, the invention has for its object to propose a method for easy adjustment of the cutting device.

This object is achieved by a cutting device of the type mentioned above in that the drive unit itself the means for fixing the position of the

Cutting head opposite the pivoting table and between the cutting head and the pivot table a floating storage is provided. By the

Dual function of the drive unit, namely adjustment of the cutting head and fixing the same, can on additional locking elements and in particular also

Release means for releasing the lock can be dispensed with. As a result, an online adjustment of the cutting device during the operation of the same can be performed. This not only simplifies the structural design of the

Cutter. The adjustment is also time-optimized and leads to an increased positioning accuracy, since the inventive design is low backlash or play. In conjunction with the drive unit as a means for fixing the position of the

Cutting head opposite the swing table, the floating storage, which can also be referred to as non-contact storage, ensures that the cutting head on the one hand quickly and precisely adjustable and on the other hand, the set position is reliably fixed. With floating or non-contact storage such bearings are referred to, in which the two bearing elements, in the present case, the cutting head on the one hand and the turntable on the other hand, have no direct contact with each other.

An expedient development of the invention is characterized in that the cutting head comprises a carrier plate which is mounted floating on the pivoting table. With this training, the aforementioned advantages are further supported.

A particularly preferred embodiment of the invention is characterized in that the floating or floating bearing either magnetic or

hydrostatically formed. In particular, a hydrostatic bearing is particularly suitable for adjusting even extremely small angles, which further increases the adjustment accuracy. Furthermore, the hydrostatic bearing also serves as a damper, whereby the precision of the adjustment and fixation is improved. Even hydrostatic bearings can be used as a floating bearing.

Preferably, there is an equilibrium of forces within the bearing, such that a force FF for fixing the carrier plate relative to the swivel table toward one another and a further force Fv for lifting the carrier plate in the opposite direction acts. As a result, at any time and in any position, a stable position of the cutting head relative to the turntable feasible. This training in Combination with the drive unit, as an adjustment device and as

Fixing device is used, allows a direct force application by means of

preloaded output unit, so that a precise and easy adjustment and fixation is ensured.

A further preferred development of the invention is characterized in that the drive unit comprises a servomotor and a servo gear. This allows a particularly fine and exact adjustment. The position of the cutting head to the turntable can be kept very reliable by the gear ratio of the transmission and / or the motor current. The adjustment and

Fixing times between the format changes are by this invention

Training especially short.

Advantageously, the servo gearbox has a ratio of greater than 1: 5. This is the requirement for a high adjustment accuracy on the one hand and the backlash in the unpowered state of the servomotor on the other hand met in a particularly simple and reliable manner.

The object is also achieved by the aforementioned method in that the loosening, adjustment and fixing is performed on-line during operation of the cutting device. The resulting benefits were already in the

Related to the cutter described. To avoid

Repetitions are therefore referred to the corresponding passages. Further expedient and / or advantageous features and further developments of

Invention will become apparent from the dependent claims and the description. A particularly preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. 1 shows a schematic representation of a cutting device which is fastened to a frame of a stranding machine, 2 is a side view of a drive unit for the adjustment and fixation of the cutting head relative to the pivoting table,

Fig. 3 is a sectional view of the drive unit according to Figure 2 in section A-A, and

Fig. 4 is a schematic representation of the pivoting table on which the (not

shown) support plate of the cutting head is floatingly mounted.

The cutting device shown in the drawing is used for cutting strands of tobacco, filter material or other products of the tobacco-processing industry and is designed to adjust to different formats.

The cutting device 10 shown in Figure 1 is basically a single unit, but is preferably used in higher-level devices / machines, which is why external, not belonging to the cutting device 10

Elements / components are also described, but should not limit the protection. In the described embodiment, the cutting device 10 is associated with a stranding machine of the tobacco processing industry. The

Cutting device 10 comprises a knife carrier 1 1 with at least one

Knife holder 12. The knife carrier 1 1 is rotatably formed by means of a drive 29 drivable. The knife carrier 1 1 and the drive 29 are assigned to a cutting head 13. In other words, the blade carrier 1 1 and the drive 29 form the cutting head 13. The cutting head 13 is mounted on a pivot table 14 and formed relative to this adjustable. In the described embodiment, the pivot table 14 is fixedly mounted on or fixed to an external fixed frame 15. Alternatively, the swing table 14 may also be fixed to the external fixed frame 15 or the like via a support means (not shown). In order to enable this attachment, the pivot table 14 is adjusted and set up accordingly. Extern means in this context that the frame 15 is not part of the cutting device 10, but - as in

Example case - the strand machine is assigned. Instead of the frame 15 may also be a frame, a carrier, a housing wall or the like as an abutment or

Serve support surface. Furthermore, the cutting device 10 comprises a drive unit 16 for

automatic adjustment of the cutting head 13 relative to the pivoting table 14 about the axis A and a means 17 for fixing the position of the cutting head 13 relative to the pivoting table 14. According to the invention means 17 for fixing the position of the cutting head 13 is an integral part of the drive unit 16. In other words In addition to the formation of the drive unit 16 as a means 17 for fixing the position of the cutting head 13 of the cutting head 13 according to the invention levitating relative to or mounted on the pivot table 14. The combination of the drive unit 16 as a locking element and the non-contact manner of the bearing 18 allows easy adjustment of the position of the cutting head 13 and the highly accurate positioning and fixing of the same. The pivoting table 14 is below a support plate 19, which is part of the

Cutting head 13 is. Preferably, the support plate 19 and the pivot table 14 are each formed circular or disc-shaped. Other forms and forms are also possible. Specifically, the support plate 19 is rotatably supported relative to the fixed pivot table 14 on this, and that about a vertically oriented and perpendicular to the strand to be cut strand S (or the strands) standing axis A. For this, the support plate 19 is floating on the turntable 14 stored. Both the support plate 19 and the pivot table 14 are rotatable about a central (not explicitly shown) guide shaft or guided and centered by this. For this purpose, the support plate 19 and the pivot table 14 has a central bore 20. The floating storage can be realized in different ways. By way of example, magnetic or hydrostatic bearings 18 are mentioned. In this case, the hydrostatic bearing 18 is particularly preferred. However, a hydrodynamic bearing 18 can also be used. The principle of the hydrostatic bearing is evident in particular from FIG. The pivoting table 14 preferably has a plurality of recesses 21 or pockets in which either an overpressure or a negative pressure can be generated. The

Support plate 19 may be flat or on the pivoting table 14 side facing be formed corresponding to the pivot table 14. By a suitable medium, such as oil, a cushion is quasi between the (not shown in Figure 4) support plate 19 and the pivot table 14 is generated, on which the

Carrier plate 19 "floats." Regardless of the medium used to generate negative pressure and overpressure, there exists within the bearing 18 or, more precisely, between the carrier plate 19 and the pivoting table 14

Force equilibrium, such that on the one hand, a fixing force FF acts, in which the two serving as a bearing shells elements, namely the support plate 19 and the

Swing table 14, pressed against each other and / or pulled, and on the other hand, a further adjustment force F _v acts in which the support plate 19 and the pivot table 14 are pushed away from each other and / or pulled. By varying the forces Fp and Fy, different operating states can be created which support an adjustment or a fixation. Since hydrostatic bearings are basically known, reference is made to a more detailed description of the function and the corresponding

Training the bearing 18 including the associated lines, valves, etc. and the control and regulation omitted.

The drive unit 16 preferably comprises a servomotor 22 and a servo gearbox 23. The drive unit 16 may, however, also comprise only the servomotor 22.

Of course, other drive motors and / or gear can be used. The

Servo gear 23 can serve as a part of the drive unit 16 as a lock, wherein the gear ratio determines the degree of locking. In other words, the lock can be optimized with increasing transmission ratio. Preferably, the servo transmission 23 has a ratio of greater than 1: 5, and more preferably a ratio greater than 1: 100. As a result, a play-free locking or fixing of the set position of the support plate 19 to the pivoting table 14 can be achieved. In the event that a servo gear 23 is used with a transmission ratio of less than 1: 5 or on the

Servo gear 23 is completely omitted, which is of course also possible, the fixation of the position could be achieved in addition to or completely via the servo motor 22. In the drive-less state of the drive unit 16 and the servomotor 22, the then permanently applied (motor) current of the servomotor 22 acts as a fixation for the pivot table 14, so that the respective position is reliably held. In a further development of the cutting device 10 according to the invention, the drive unit 16 may further comprise a ball screw drive 24. In the described embodiment, the ball screw 24 comprises a

Ball screw 25 and one on the ball screw 25 movable back and forth pivot bearing block 26, which is designed as a movable bearing and is also referred to as a rider. There is also the possibility that the ball screw 25 is adjustable within the pivot bearing block 26, so that the unit

Drive motor or servomotor 22 (possibly servo gear 23), pivot bearing block 26 and ball screw 25 on the frame 15 to and from this is movable. The ball screw 25 is adapted for direct support or storage on the external frame 15 and set up and in the assembled state with a

Swivel bearing block 27 attached directly to the frame 15. In the pivot bearing block 27, the ball screw 25 is mounted. The pivot bearing block 27 is fixedly connected to the frame 15, for example by screws. The drive motor or servomotor 22 is freely suspended in one embodiment. In other embodiments, the drive motor or servo motor 22 may also be supported directly and directly on the frame 15. Optionally, the ball screw 25 is assigned a protective element 28. Preferably, the protective element 28 is a spring spiral. This is, for example, between the two pivot bearing blocks 26 and 27 attached. The ball screw 25 usually has a low slope (ie a kind

Fine thread), whereby the fixing effect of the drive unit 16 is further enhanced. Of course, other spindles are also used. The preferably hydrostatic bearing 18 is, as mentioned above, a

Control and / or regulating unit assigned. Thus, the storage between the support plate 19 and the pivot table 14 is automatically changed. This means that the bearing 18 is virtually on-line from the fixation in an adjustment and vice versa changeable. In other words, the on-line adjustment allows a length adjustment during operation of the cutting device 10. So that the adjustment movement of the drive unit 16 on the support plate 19 and on the cutting head 13 is transferable, a connecting element is provided, the drive unit 16 with the

Support plate 19 connects. This connecting element may be a rod which is attached to the one side fixed to the pivot bearing block 26 and is pivotally mounted on the opposite side to the support plate 19. There is also the possibility that the rod or any other suitable connecting element on the one hand firmly connected to the cutting head 13 or more precisely the support plate 19 and on the other hand rotatably or pivotally attached to the pivot bearing block 26. Other usual

Possibilities of producing an operative connection between the drive unit 16 and the cutting head 13 are also possible.

Claims

claims

1. Cutting device (10) for a strand machine of the tobacco processing industry, comprising a knife carrier (11) with at least one

Knife holder (12), a drive (29) for rotationally driving the

Knife carrier (11), wherein the knife carrier (11) and the drive (29) a

Cutting head (13) are assigned, relative to a fixed, to

Attachment to an external frame (15) or the like

Punching machine adapted tilting table (14) is adjustable, a drive unit (16) for automatically adjusting the cutting head (13) relative to the pivoting table (14), and means (17) for fixing the position of the

Cutting head (13) relative to the pivot table (14), characterized

characterized in that the drive unit (16) itself is the means (17) for fixing the position of the cutting head (13) relative to the pivoting table (14) and a floating support is provided between the cutting head (13) and the pivoting table (14).

Cutting device according to claim 1, characterized in that the cutting head (13) comprises a support plate (19) which is floatingly mounted on the pivoting table (14).

Cutting device according to claim 1 or 2, characterized in that the floating or floating bearing (18) is optionally formed magnetically or hydrostatically.

Cutting device according to one of claims 1 to 3, characterized

characterized in that within the bearing (18) a balance of forces exists, such that a force FF for fixing the support plate (19) relative to the pivot table (14) toward each other and another force Fy for lifting the support plate (19) in the opposite Direction works.

Cutting device according to one of claims 1 to 4, characterized

characterized in that the drive unit (16) comprises a servomotor (22) and a servo gearbox (23). Cutting device according to claim 5, characterized in that the servo gear (23) has a ratio of greater than 1: 5.

Cutting device according to one of claims 1 to 6, characterized

in that the drive unit (16) comprises a ball screw drive (24).

Cutting device according to claim 7, characterized in that the ball screw (24) has a ball screw (25) and one on the

Ball screw (25) reciprocally movable pivot bearing block (26).

Cutting device according to one of claims 1 to 8, characterized

in that the bearing (18) or the bearing prevailing in the bearing

Force ratio FF: FV between the cutting head (13) and the pivot table (14) is automatically changed.

Cutting device according to one of claims 1 to 9, characterized

characterized in that the drive unit (16) is connected via a connecting element with the carrier plate (19).

Method for adjusting a cutting head (13) formed from a knife carrier (1 1) and a drive (29) with respect to a pivoting table (14) in a cutting device (10) of a stranding machine of the tobacco-processing industry, comprising the steps of:

Releasing means (17) for fixing the position of the cutting head

(13) opposite the turntable (14),

Adjusting the position of the cutting head (13) relative to the pivoting table

(14) by means of a drive unit (16),

Fixing the position of the cutting head (13) relative to the

Pivoting table (14) by means (17) for fixing, characterized in that the loosening, adjustment and fixing on-line during the operation of the cutting device (10) is performed.