EP0521828B1 - Drive mechanism for a threading device in a rotary press - Google Patents

Description

The invention relates to a drive for a device for pulling material webs in rotary printing presses through a pulling element of finite length, according to the preamble of patent claim 1.

Such devices are known. For example, DE-A-22 41 127 shows a driven retracting element which consists of a roller chain of finite length and which can be moved in guides which consist of hollow profiles. The guides are firmly attached to the frame of the printing machine along the intended retraction paths. They have branches, switches, crossings and the like, with which the retraction path can be preset. The roller chain is moved by means of drive devices fixed to the machine frame. This means that a large number of such drive devices must be provided over the entire pull-in path, since the distance between the individual drive devices must be smaller than the longitudinal dimension of the roller chain.

Another such device is shown in DE-A-20 21 246. A motor vehicle, equipped with an electric drive motor, travels along a rack guide, a gear wheel driven by the electric drive motor being in engagement with the rack. This rack and pinion guide is also attached to the frame of the printing machine along the retraction paths and has switches, crossings and the like for presetting the retraction path. When operating with an external power source, the electricity fed via a power supply rail with which a pantograph, arranged on the motor vehicle, is in contact. The current feedback is probably via the rack guide. In the case of battery operation, the corresponding batteries are carried in an additional vehicle coupled to the motor vehicle.

This device has the disadvantage that only one motor vehicle is provided and a certain driving force is required that the dimensions of the motor vehicle become very large, so that a lot of space is required for the feeding system in the printing press, which in many cases is not already available and would have to be created additionally. Furthermore, there is a risk of the rack becoming dirty, which can lead to undesirable faults during the pulling-in process.

The object of the invention is to provide a drive for a device for pulling material web, which is arranged directly on the pull-in element, with which the required tensile force for pulling the material web into the rotary printing press can be easily applied, and that nevertheless Retractable element, seen in cross section, has very small dimensions. Furthermore, the power supply and the drive transmission should be designed so that faults due to contamination can be excluded.

According to the invention, the object is achieved by the features listed in the characterizing part of claim 1.

Advantageously, the guide rail is provided on both sides in its head region with tufts of bristles arranged transversely to the direction of travel of the retracting element, into which the ribs of the wheels on the drive shaft the electric motors are attached. This effectively creates a positive force transmission between the guide rail and the wheel, which has an elastic behavior due to the resilient bendability of the bristle tufts 34. This means that each wheel has its own intervention adjustment so that the drive units located one behind the other and in pairs do not interfere with each other.

Furthermore, the tufts of bristles in which the wheels of the drive motors engage are practically self-cleaning. Each time the retracting element is passed through, the bristle tufts are bent by the ribs of the wheels and then spring back into the original position, as a result of which dirt particles hanging on the bristle tufts are thrown away.

Thanks to the links arranged in series with the numerous drive motors, high traction can be applied with minimal cross-sectional dimensions.

Additional advantageous embodiments of the invention result from the further dependent claims.

• Fig. 1 eine Seitenansicht eines Ausschnittes des Einziehelementes mit vier einzelnen Gliedern;
• Fig. 2 eine Schnittdarstellung gemäss Linie II-II nach Fig. 5 durch ein mit Antriebsmotoren versehenes Glied des Einziehelementes;
• Fig. 3 eine Schnittdarstellung gemäss Linie III-III nach Fig. 5 durch ein Glied des Einziehelementes, ausgerüstet mit Stromabnehmer;
• Fig. 4 eine Schnittdarstellung gemäss Linie IV-IV nach Fig. 5 eines Gliedes des Einziehelementes, ausgerüstet mit einer Haltevorrichtung zur Aufnahme des Einziehbandes;
• Fig. 5 eine Draufsicht auf einige Glieder des Einziehelementes, entsprechend Fig. 1;
• Fig. 6 eine schematische Darstellung der Anordnung der Einzelglieder als gesamtes Einziehelement;
• Fig. 7 die Schaltungsanordnung, wie sie im Glied des Einziehelementes, ausgerüstet mit Stromabnehmer, ausgeführt ist;
• Fig. 8 die Schaltungsanordnung, wie sie im Glied des Einziehelementes, ausgerüstet mit Antriebsmotoren, ausgeführt ist;
• Fig. 9 eine schematische Darstellung der Stromzuführung in die Führungsschienen;
• Fig. 10 bis 12 die Darstellung einer Ausführungsvariante des Antriebs;
• Fig. 13 bis 15 die Darstellung einer weiteren Ausführungsvariante des Antriebs.

Embodiments of the invention are shown in the drawing and are explained in more detail below. Show it

• Figure 1 is a side view of a section of the retracting element with four individual links.
• FIG. 2 shows a sectional view along line II-II according to FIG. 5 through a link of the pull-in element provided with drive motors;
• Fig. 3 is a sectional view along line III-III of Figure 5 by a link of the retracting element, equipped with a pantograph.
• FIG. 4 shows a sectional view along line IV-IV according to FIG. 5 of a link of the drawing-in element, equipped with a holding device for receiving the drawing-in belt;
• Fig. 5 is a plan view of some links of the retracting element, corresponding to Fig. 1;
• Fig. 6 is a schematic representation of the arrangement of the individual links as a whole retraction element;
• Figure 7 shows the circuit arrangement as it is carried out in the link of the retracting element equipped with a pantograph.
• Figure 8 shows the circuit arrangement as it is carried out in the link of the retracting element equipped with drive motors.
• Fig. 9 is a schematic representation of the power supply in the guide rails;
• 10 to 12 show an embodiment of the drive;
• 13 to 15 the representation of a further embodiment variant of the drive.

As shown in FIG. 1, the pull-in element 1 consists of a plurality of links 2, 3, 4 arranged one behind the other. Each of the links 2, 3, 4 consists of a housing 5, 6, 7. In each housing 5, 6, 7 are arranged on the side facing the guide rail 8 guide rollers 9, 10, which are freely rotatably mounted on corresponding axes 11, which are fastened in each housing 5, 6, 7. Each of the guide rollers 9, 10 is symmetrically associated with a corresponding guide roller on the invisible side of the guide rail 8, which thereby form the interacting pairs of guide rollers 9, 10 for guiding the links 2, 3, 4 on the guide rail 8.

Each of the links 2, 3, 4 is connected to its adjacent link by a resilient connecting means so that the individual links can be deflected and twisted in all directions within the frame, as is necessary due to the predetermined path of the guide rails.

According to a first embodiment variant, as can be seen in FIG. 1, this connection is designed such that, seen in the direction of travel (arrow 12), a slit-shaped recess 13 is machined at the front and rear end of each housing 5, 6, 7, which is formed by two tabs 14 and 15 is limited.

Both tabs 14 and 15 are each provided with a bore into which a bolt 16 is inserted and held stationary.

One end of a coupling rod 18, which is provided with an opening 17, is articulated on these bolts 16. Two links 2, 3 or 4 are thus articulatedly connected to one another by a coupling rod 18. Both end openings 17 of the coupling rod 18 have a central region 19 which corresponds approximately to the diameter of the bolt 16, while the outer regions 20, 21 have a diameter which increases in size towards the outside.

A spring 22, which is attached to the bolt 16 and which is supported on the bracket 14, presses the coupling rod 18 against the flat inside of the bracket 15. The coupling rod 18 is cuboidal, which creates a defined support on the inside of the bracket 15 . This gives the entire retraction element 1 the tendency to be in the plane that is perpendicular to the pressure roller axes. Due to the design of the openings 17 of the coupling rod 18, the coupling rod 18 permits a deflection movement with respect to the coupled links 2, 3 or 4. As a result, the pull-in element 1 can also follow a curvature of the guide rail 8 which leads away from the plane which is perpendicular to the pressure roller axes.

In order to allow the pivoting movement described above, the slot-shaped recess 13 has a width b which corresponds to at least twice the height h of the coupling rod 18. To limit this pivoting movement, the spring 22 is guided in a sleeve 23, the lower open edge of which serves as a stop for the coupling rod 18.

According to a second embodiment variant, the resilient connecting means of two adjacent links consists of a spring bar. The spring rod is provided at both ends with a holder fixed thereon, which is fastened in the slot-shaped recess 13, which is formed by the two tabs 14 and 15, of the links 2, 3, 4 in a known manner. The spring bar has a circular cross section, which optimally ensures the desired deflections and twists.

As can be seen in the sectional view according to FIG. 2, the link 2 is designed to drive the pull-in element 1. For this purpose, an electric motor 24 and 25 is accommodated in the housing 5 on both sides of the guide rail 8. A gear 26 or 27 is coupled to each electric motor 24 and 25, from which a drive shaft 28 or 29 projects into the region of the guide rail 8. On each of these drive shafts 28 and 29, a wheel 31 provided with ribs 30 is rotatably attached. The arrangement of the electric motors 24 and 25 in the housing 5 is selected such that the corresponding wheel 31 comes to rest between the guide rollers 9 and 10 (FIG. 1).

The guide rail 8 has on its upper area a continuous longitudinal groove 32 in both sides, in which a correspondingly shaped part 33 of the guide roller 9 or 10 engages. At the level of the wheel 31, bristle tufts 34 are embedded on both sides in the guide rails 8 transversely thereto. The ribs 30 of the wheel 34 engage in these bristle tufts 34, thereby ensuring a quasi-positive force transmission between the drive and the guide rail 8 which has an elastic behavior due to the resilient bendability of the bristle tufts 34. The guide rollers 9, 10 have an incision 35 in the region of the bristle tufts 34 of the guide rail 8, while the lowermost part 36 serves as a support against lateral tilting. The guide rail 8 is fastened in a known manner in the frame of the printing press.

3 shows a sectional view through the link 3 of the pull-in element 1. The link 3 supplies the electric motors of the pull-in element 1 with energy. For this purpose, a current collector 37 is arranged centrally in the housing 6, as can also be seen from FIG. 1, which is pressed by a spring 38 against the current-carrying sliding part 39, which is arranged on the end face along the guide rail 8. The link 3 has identical guide rollers 9 and 10 as the link 2 of the pull-in element 1. On both sides of the housing 6, a diode 40 or 41 is attached. The operation of the power supply and the circuit will be described later.

Fig. 4 shows a sectional view through the Link 4 of the retraction element 1. This link 4 is equipped to receive the tape to which the beginning of the web of material to be drawn in can be attached. A pin 43 is rotatably held centrally in the housing 7 of the link 4. The part 44 of the pin 43 protruding from the housing 7 has a surface 45 on which the band 42 is held by means of screw 46. This can also be seen in FIG. 1. Corresponding to the clothes 2 and 3, this link 4 is also equipped with guide rollers 9, 10 which are in engagement with the guide rail 8.

5 shows a plan view of a part of the links 2, 3, 4 of the pull-in element 1, according to FIG. 1. In each of the links 2, 3, 4, the left half shows the view with the cover removed, while the right half with the cover screwed on Cover 47 is shown. The representation of the link 2 shows the symmetrically arranged electric motors 24 and 25. Link 3 shows the centrally arranged current collector 37 and the diodes 40 and 41 attached symmetrically to the guide rail 8 on the housing 6. In the view of the link 4 the fastening of the band 42 to the part 44 of the pin 43 is shown again. The individual links 2, 3, 4 are mutually articulated via the coupling rods 18.

The arrangement of the individual links 2, 3 and 4, which together form the pull-in element 1, is shown in FIG. 6. One link 2, equipped with drive motors, one link 3 with pantograph, and another link 2 with drive motors, coupled in series, form a group 48. In the direction of travel (arrow 49) from the front, seven such groups 48 are coupled to one another. Then the link 4, equipped with a hitch for the material web to be drawn in, inserted, after which another four groups 48 are coupled.

The power supply to the pull-in element 1 takes place via sliding parts 39 inserted in the guide rail 8. The arrangement of these sliding parts 39 is shown in FIG. 9. The positive current conductor 50 and the negative current conductor 51 are accommodated in the foot part of the guide rail 8. The sliding parts 39, which each extend only over a certain length in the guide rail 8, preferably 30 cm to 50 cm, are alternately connected to the positive current conductor 50 and the negative current conductor 51. The two current conductors 50 and 51 are connected to a supply device, not shown, for direct current with a voltage of 12 volts. The sliding parts 39 are at a mutual distance a, which is greater than the dimension of the pantograph 37 in the direction of travel, thereby preventing the circuit from being short-circuited.

In Fig. 7 the arrangement of the circuit is shown, as it is carried out in each link 3, equipped with current collector 37. The current collector 37 passes through sliding parts 39 alternately connected to the positive current conductor 50 or to the negative current conductor 51 while the material web is being drawn in. In order to keep the polarity at the connections 52 and 54 always negative, at the connections 53 and 55 always positive, between the connection connections 60 and 61 each have a diode 40 or 41 interposed, which are alternately blocked or transparent. If the current collector 37 is in contact with a negative sliding part 39, the diode 40 is permeable, the passage of the diode 41 is blocked. When the current collector 37 is in contact with a positive sliding part 39, the diode 41 is transparent, the passage of the diode 40 is locked.

According to the circuit shown in FIG. 8, with which each link 2 of the retracting element 1 is equipped, the two electric motors 24 and 25 are connected in parallel. The polarity of the connections 57 and 59 is always positive, the polarity of the connections 56 and 58 is always negative. The electric motors 24 and 25 are connected in such a way that they have an opposite direction of rotation. The current connection to the adjacent link 3 (FIG. 7) is made via two electrical lines, one of which connects the connections 55 and 57, while the other connects the connections 54 and 56.

All members 2 and 3 of the retracting element 1 are electrically connected to one another in this way. This means that all drive motors 24, 25 of the links 2 and all current collectors 37 of the links 3 of the pull-in element are electrically connected to one another and are connected in parallel. Since the length of the sliding parts 39 on the guide rail 8 is selected such that a number of the current collectors 37 of the pull-in element 1 always runs on positive sliding parts 39 and a number of current collectors 37 of the pull-in element 1 run on negative sliding parts 39, this ensures that the circuit is permanently closed.

Another embodiment variant of the drive, as shown in FIGS. 10 to 12, consists in that in the link 2, which is equipped with electric motors 24 and 25, the guide rollers 9, 10 instead of an incision 35 (FIG. 2) in this area are equipped with ribs 70 which correspond to the ribs 30 of the wheel 31 (FIG. 2). In this case, the guide rollers 9, 10 equipped with ribs 70 are driven by the electric motors 24 and 25 via gear drives 71, 72. The ribs 70 engage in the tufts of bristles 34 of the guide rail 8 and move the pull-in element 1 on the guide rails 8.

In a further embodiment of the operation, shown in FIGS. 13 to 15, the guide rollers 9, 10 of the link 2, which is equipped with electric motors 24 and 25, are equipped with friction linings. The guide rollers 9 and 10 are driven in the same way as in the embodiment variant according to FIGS. 10 to 12, namely via gear transmissions 71, 72. The friction linings consist of a caterpillar-shaped band 73, which each has two guide rollers 9 arranged on one side of the guide rail 8 , 10 wraps around. The caterpillar-shaped band 73 is pressed by the guide rollers 9, 10 against the guide rail 8, which in this case manages without tufts of bristles. The caterpillar tapes 73 are easily replaceable when they are badly worn.

With this illustrated power supply of the retraction element, the concept of the power transmission and the coupling and guiding of the individual links of the retraction element, a trouble-free retraction of the material web into the rotary printing press via turning bars and through Bay-Windows is guaranteed.

To preset the pull-in carriage by the rotary printing machine, the guide rail network is equipped with known switches, crossings, and the like, not shown, the position of which can be remote-controlled.

Claims (8)

1. Drive device for feeding fabric webs into rotary printing machines by way of a feed element of finite length consisting of a plurality of individual links pivotably connected together and having guide pulleys, by means of which the feed element can be moved away along a guide rail mounted outside the roller region on the frame of the rotary printing machine and equipped with branches for presetting the feed path, characterised by the following features:

   - at least two links (2) of the feed element (1) are equipped with at least one electric drive motor (24, 25) each which drives at least one wheel (31) or which drives the guide pulleys (9, 10) via a gear so that the feed element (1) moves away on guide rails (8);

   - at least two further links (3) of the feed element (1) are equipped with a centrally disposed, resiliently supporting current collector (37), which is in sliding contact with live slide members (39) mounted on the guide rail (8);

   - the slide members (39), which consist of rod-like profiles disposed consecutively and spaced apart from one another on the guide rail (8), are connected alternately to a positive current conductor (50) and to a negative current conductor (51);

   - all drive motors (24, 25) of the links (2) and all current collectors (37) of the links (3) of the feed element (1) are electrically connected together and in parallel;

   - between the connecting lead (60) with negative polarity and the current collectors (37) a respective diode (40) is connected, which is conductive if the current collector (37) is in contact with a negative current conductor (39);

   - between the connecting lead (61) with positive polarity and the current collectors (37) a respective diode (41) is connected, which is conductive if the current collector (37) is in contact with a positive current conductor (39);
2. Device according to claim 1, characterised in that the guide rail (8) is provided on either side of its top region with brushes (34) disposed transverse to the direction of travel of the feed element (1).
3. Device according to claim 2, characterised in that each electric drive motor (24, 25) is provided on its drive shaft (28) or (29) with a wheel (31) having fins (30) meshing with the brushes (34) of the guide rail (8).
4. Device according to claim 2, characterised in that the guide pulleys (9, 10) are equipped in the region of the brushes (34) with fins, which are in engagement with the brushes (34) and in that the guide pulleys (9, 10) are drivable by the electric drive motors (24, 25) via gears.
5. Device according to claim 1, characterised in that wheels (31) or guide pulleys (9, 10) driven by the electric drive motors (24, 25) which roll over the guide rails (8) and move the feed element (1) over the guide rails (8) are equipped with a friction lining.
6. Device according to claim 5, characterised in that the friction lining of the guide pulleys (9, 10) consists of a belt (73) in the form of a caterpillar track which passes round guide pulleys (9, 10) arranged two on one side of the guide rail (8).
7. Device according to one of claims 1 to 6, characterised in that a feed element (1) is composed of seven assemblies (48) pivotably connected together, a link (4) coupled thereto with a mounting (43, 44, 45, 46) for a belt for fixing the fabric web, and a further four assemblies (48) coupled thereto and pivotably connected together, one assembly (48) consisting of a link (2) with drive motors (24, 25), a link (3) coupled thereto with a current collector (37), and a link (2) coupled thereto having drive motors (24, 25).
8. Device according to one of claims 1 to 7, characterised in that the guide rails (8) consist of a non-conductive material, in particular plastics material.

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