EP0281790B1

EP0281790B1 - Device for continuously winding or unwinding flat products on or from a roll

Info

Publication number: EP0281790B1
Application number: EP88102139A
Authority: EP
Inventors: Walter Reist
Original assignee: Ferag AG
Current assignee: Ferag AG
Priority date: 1987-03-06
Filing date: 1988-02-13
Publication date: 1990-12-19
Anticipated expiration: 2008-02-13
Also published as: EP0391453A1; FI881030A; EP0391453B1; FI84335C; JPS63235249A; DE3861293D1; AU592038B2; AU1260588A; CA1306454C; SU1563588A3; FI84335B; US4898336A; AT59178T; JP2525637B2; DE3876635D1; AT83214T; CH679993A5; EP0281790A1; FI881030A0; FI881030D0

Description

The present invention relates to a device according to the preamble of claim 1. Such a device is known for example from CH-PS 559 691. In this device, a further supply spool and guide rollers for a second winding belt are arranged above the conveyor belts arranged in a stationary manner and above the flat structures and below these the winding belt feeding or taking away the winding belt. At the end of the conveyor belt arrangement, the two winding belts, which are practically as wide as the flat structures, form a conveyor gap in which the flat structures are clamped and, together with the winding belts, fed to the driven winding core, and wound up together with the winding belts.
This solution is disadvantageous not only because of the two winding tapes required, but also because the length of the conveyor gap existing between the conveyor belt arrangement and the winding core or the winding and formed only by the two winding tapes is limited. If the fabrics are comparatively heavy, there is a risk that the lower winding belt will sag in the area of the mentioned conveyor gap as a result of the inevitable expansion, so that the upper winding belt loses contact with the fabrics and thus, in particular, at a higher conveying speed for an orderly opening and closing Unwinding are no longer adequately managed. This disadvantage could be alleviated somewhat in that the lower winding tape in particular is put under considerable tensile stress, which reduces its sagging. However, this means that when the drive of the winding core is wound up, especially when the winding diameter increases, a torque that overcomes this tensile stress, i.e. has to deliver a considerably higher output at a given speed.
It is therefore an object of the invention to design a device of the type mentioned in the introduction in such a way that the disadvantages mentioned above are largely avoided.
This object is achieved by the proposed device in that it has the features specified in the characterizing part of patent claim 1.
With similar devices, it is known to lead the conveyor belt arrangement underneath the winding core or to the winding formed thereon or to lead away from it. In these devices, however, the storage of the winding core is arranged at a constant height. The consequence of this is that the conveyor belt arrangement is to be designed as a pivotable rocker which is able to cover the entire diameter range from the winding core up to the maximum winding diameter in the manner of a tonearm of a turntable, without the inclination of the conveyor belt arrangement assuming values which a Slipping of the sheet material fed in or out in the free circulation would result in the conveyor belt. Accordingly, in these previously known devices, the length of the rocker-type conveyor belt arrangement is to be dimensioned to a comparatively significant value, with the result that the space requirement of the devices with a bearing point arranged at a constant height for the winding core is relatively large and direct drive of the conveyor belt arrangement is practically inevitable.
This is not the case with the proposed device, because the point where the flat structures are fed to the roll or taken away from the roll is always in the region of the lowest point of the roll, i.e. at a practically constant height. The conveyor belt arrangement is not to be driven directly because it is indirectly carried along by the winding core or the winding located thereon.
Features of preferred embodiments are described in the dependent claims.
Further advantages of the proposed device result from the subsequent description of an exemplary embodiment with reference to the drawing. It shows:

1 is a schematic view of a device,
Fig. 2 is a view from the direction of arrow II of Figure 1, the left half corresponds approximately to a section AA and
Fig. 3 is a schematic representation of the drives of Fig. 1 and their control elements.

The device 10 shown in the drawing has a base 11 on which, on the one hand, two upright guide columns 12, 13 are anchored and, on the other hand, a conveyor belt arrangement 14, only shown schematically, is mounted. The deflection roller 15 of the conveyor belt arrangement 14 connects to a conveyor 16, of which only the end or the beginning (depending on whether winding or unwinding) is shown in FIGS. 1 and 3.
Between the two guide columns 12, 13, a carriage or carriage 18 is mounted, which is displaceably guided by rollers 17 and from which the drive members for an essentially hollow cylindrical winding core 19 protrude. These drive members comprise two drive wheels 20, 21 which drive the winding core 19 from the inside in a frictional engagement, and a freely rotatably mounted tensioning roller 22 which holds the winding core 19 in contact with the drive wheels 20, 21 EP OS 0161569 described in detail. However, it goes without saying that a differently designed drive for the winding core, which does not necessarily have to be hollow cylindrical, can also be provided.
A nut piece 23 (FIG. 2) is anchored on the carriage 18 and is penetrated by a threaded spindle 24 parallel to the guide columns 12, 13. The threaded spindle 24 is attached by means of a stationary motor 25, for example on the guide columns 12, 13, which is only indicated schematically drivable, so that the motor 25 of the carriage 18 can be moved and held practically continuously over the entire height of the guide columns 12, 13.
A motor 26 flanged to the carriage 18 is coupled to the drive wheel 21, while the drive wheel 20 is positively coupled to the drive wheel 21 via a chain drive 27.
The conveyor belt arrangement 14 is arranged in a frame 28, indicated only schematically in FIG. 1, which is pivotally mounted about the axis of the deflection roller 15 and carries a further deflection roller 29 at its end which appears on the right in FIG. 1. The two deflection rollers 15 and 29 are freely rotatably supported and looped around by a pair of comparatively slack conveyor belts 30, 31 (FIG. 2). Between the deflecting rollers 15 and 29 and between the conveyor belts 30, 31, a further deflecting roller 32 is freely rotatably mounted on the frame 28 in a manner not shown, which has a winding belt 34 pulled off a supply roller 33 or wound onto it and guided over the deflecting roller 29 brings to the height of the upper run of the conveyor belts 30, 31 and runs in the same direction with them.
The frame 28 and thus the conveyor belts 30, 31 and also the winding belt 34 are pushed upwards by means of a spring 35, for example a gas spring, so that the comparatively slack conveyor belts 30, 31 are pressed against the circumference of the winding W located on the winding core 19 and wrap it over a comparatively large arc length. If the winding W is driven via the winding core 19 in one or the other direction of rotation, the conveyor belts 30, 31 thus run along and the winding belt 34 is pulled off the supply roll 33 or wound onto it.
For this purpose, the supply roll 33 is positively coupled via a chain drive 36 to a torque-controlled machine 37, which will be returned in particular in connection with FIG. 3. It follows from the above description that the device is suitable for producing coils of the most varied diameters, and in addition finished coils W, regardless of their diameter, can be raised by means of the threaded spindle 24 to such an extent that they can be pulled through from the side opposite the carriage 18 ( 2 from the right) transport vehicle (for example by a forklift) can be removed from the drive wheels 20, 21 and the tensioning roller 22 and transported to an intermediate storage location. In Fig. 1 the bottom and top positions of the winding core 19 can be seen with dash-dotted circles. The direction of rotation of the winding W is indicated by the arrow 38 when winding and the arrow 39 indicates that when it is being unwound.
FIG. 3 largely corresponds to FIG. 1, but in this FIG. 3 a block diagram of the electrical circuit is superimposed. In this figure, the symbol M 1 corresponds to the motor 26, the symbol M 3 to the motor 25 and the symbol M 2 to the torque-controlled machine 37.
A transmitter 40, for example a tachometer generator, is coupled to the illustrated deflection roller of the conveyor 16, which generates a “target” signal relating to the speed and the conveying direction of the conveyor 16. This signal reaches a comparator and feed stage 42 via a line 41.
A transmitter 43 is also coupled to the deflection roller 32 for the winding tape 34, which generates an “actual” signal with respect to the actual peripheral speed and the direction of rotation of the winding W. This actual signal is fed to the comparator and feed stage 42 via a line 44. In accordance with the difference signal determined in the stage 42, this controls the motor 26 (M 1) via a feed line 45 in such a way that the rotational speed at which it drives the winding core 19 leads to a peripheral speed of the winding W, which with respect to the direction and speed of that of the Conveyor 16 corresponds. For this purpose, the motor 26 (M 1) can be a reversible DC machine or a frequency-controlled pole-changing asynchronous motor. The conveyor belt arrangement 14 is assigned two buttons 46, 47, for example light barriers, which detect the momentary installation of the upper run of the conveyor belts 30, 31. If the button 47 responds, the motor 25 (M 3) of the threaded spindle 24 is switched on via the line 48 in the sense of lifting the carriage 18 (and thus the roll W) and remains switched on (when winding up) until the button 46 appeals. When the roll W is unwound, the buttons 46, 47 swap their roles. The motor 25 (M 3) can, however, also be switched on and off via a switch 49, which is only indicated schematically and bridges the buttons 46, 47. A reversible and pole-changing asynchronous machine has proven to be expedient for the motor 25 (M 3). Via the switch 49, the motor 25 (M 3) is switched on when a finished roll has to be raised to the highest position for takeover by a transport vehicle (as mentioned) or when an empty roll core 19 has to be lowered so far that it touches the conveyor belt arrangement 14 .
The winding tape 34 is kept under as constant a tension as possible when winding the winding W. Therefore, the supply roll 33 is to be braked in accordance with its own diameter so that the winding tape receives the desired tension (and elongation) between the run-off point from the supply roll 33 and the run-up point on the roll W. The braking torque to be exerted on the supply roll 33 is of course dependent on its current diameter. Therefore, the supply roll 33 is assigned a diameter sensor 50 which controls the torque-controlled machine 37 (M 2) via a control line 51 and a control stage 52. This torque-controlled machine 37 (M 2) is expediently a torque-controlled servo DC machine which can be switched both as a motor (drive) and as a generator (brake).
When unwinding the winding W (arrow 39), the direction of rotation of the machine 37 (M 2) is reversed, so that it - possibly via a slip clutch (not shown) - the supply roll 33 approximately like this drives, like the receiving spool of a magnetic tape cassette, whereby the released wrapping tape 34 again gets full on the supply roll 33, while the flat structures Z reach the conveyor 16 via the conveyor belt arrangement 14.

Claims

1. A device continuously winding flat articles (Z), in particular printed items in overlapping array, to or from a reel (W) with a power-driven reel hub (19) adjustable in height, a feed roll (33) for a winding strip (34) wound on or off together with the flat articles (Z), a conveyor (16) to feed or remove the flat articles (Z) to be wound on or off, and a belt conveyor (14) arranged between the conveyor (16) and the reel hub (19) to lead in or away the flat articles (Z) and the winding strip (34), characterized in that the belt conveyor is designed as a freely revolving unit which partially wraps the reel hub (19), or the reel (W) on the hub, in undershot fashion, and under spring action, the drive elements (20, 21) for the reel hub (19) being mounted on a vertically guided travelling slide (18) which can be raised and lowered by means of lifting gear (24, 25) which can be governed by the present position of the belt conveyor (14).

2. A device according to Claim 1, characterized in that the belt conveyor (14) is mounted so as to be capable of pivoting about the return roller (15) nearer to the conveyor (16), and in that position sensors (46, 47), for example light barriers, are operatively associated with the belt conveyor (14) to detect its position and to switch the lifting gear (24, 25) on or off.

3. A device according to Claim 1 or 2, characterized in that the lifting gear has an essentially vertical threaded spindle (24), which can be driven by a motor (25), and which engages in a nut (23) secured to the slide (18).

4. A device according to one of Claims 1-3, characterized in that the drive elements (20, 21) for the reel hub (19) are coupled to a motor (26) flange connected to the slide (18).

5. A device according to Claim 3, characterized in that the motor (25) for the threaded spindle (24) is a reversible, pole-changeable asynchronous motor.

6. A device according to one of Claims 1-5, characterized in that the belt conveyor (14) has two conveyor belts (30, 31) laterally spaced apart, and in that a deflection roller (32) to guide the winding strip (34) to or from the reel is arranged in the region of the strands of the conveyor belts (30, 31) wrapping the reel hub (19) or the reel (W) on the hub and between the said conveyor belts.

7. A device according to Claim 2, characterized in that a switch (49) is provided for switching the lifting gear (24, 25) on and off independently of the actuation of the position sensors (46, 47).

8. A device according to Claim 6, characterized in that the deflection roller (32) for the winding strip (34) is freely rotatable.