EP0628942A1 - Method of scrolling an advertising sign in the form of a band and device therefor - Google Patents

Abstract

The invention relates to a method of unrolling advertisements arranged in the form of a band, optionally with use of deflection rollers, the band unrolling from a driven first reel and rolling up on to a driven second reel and vice versa. In order to compensate for the roll radii, it is provided that the two reels are driven at the same speed and the band is held between the two reels under resilient stressing applied by at least one of the reels. In the case of a corresponding device for unrolling advertisements arranged in the form of a band, having a first driven reel (2) and a second driven reel (3) for receiving the band (1) and optionally having deflection rollers (42, 43), each driven reel exhibiting a rotatably mounted cylinder jacket (5), for receiving a band roll and a rotatably mounted driven shaft (4), it is provided that, in the case of at least one reel (2), the shaft (4) is connected to the associated cylinder jacket (5) via at least one spring device (8) which is prestressed in the rolling-up direction. <IMAGE>

Description

The invention relates to a method for unrolling advertisements arranged in the form of a tape, the tape possibly unrolling from a driven first roller and rolling onto a driven second roller and vice versa using deflection rollers.

Such a method is known from EP-B1 333 820. There is a note that the rollers are driven using motors that are controlled by a computer.

From FR-PS 1353043 a method is known in which the rollers are driven by motors, each of which is assigned a direction of rotation and which are connected to the rollers via electrical couplings. If the tape is rolled up on a roll, the associated motor is excited and the corresponding clutch is actuated, while the roll from which it is unwound is separated from its motor via the assigned coupling, so that the unwinding roll can run freely. In this way, the changing different winding radii when rolling up and down are compensated.

It is the object of the present invention to create a method of the generic type in which the compensation takes place and only one drive motor is used.

This object is achieved in that the drive of both rollers takes place at the same speed and the belt between the two rollers is held under a spring-elastic pretension applied by at least one of the rollers.

When carrying out the method according to the invention, the shafts of the two rollers can be coupled in a slip-free manner by means of a drive element, in particular a toothed belt, and it is sufficient that this system is moved by means of a single motor acting on one of the shafts or on the drive element itself. By holding the band section between the two rollers under a resilient pretension, the different circumferential speeds of the rollers occurring at the same rotational speed of the shafts when the roller is being wound and unrolled on the rollers can be compensated. At the same time, the belt section between the rollers is kept taut so that the advertisement formed on the belt section itself or the display elastically attached as a separate advertisement on the belt section can be read undisturbed when the belt section is stopped between the rollers for a predetermined period of time.

Although it is possible that the pretension directed towards the rollers is applied by only one of the two rollers, it is possible that this pretension is also applied proportionately by both rollers.

The invention is also directed to a device for unrolling advertisements arranged in the form of a tape with a first driven roller and a second driven roller for receiving the tape and possibly with deflection rollers, each of the driven rollers having a rotatably mounted cylinder jacket for receiving a tape roll and has a rotatably mounted driven shaft.

In the prior art according to EP B1 333820 and FR-PS 1353043, the cylinder jacket is rotatably connected to the rotatably mounted shaft for each roller.

In order to generate the pretension to be applied by at least one roll, the invention provides that, in the case of at least one roll, the shaft is connected to the associated cylinder jacket by at least one spring device which is prestressed in the winding direction.

A particularly simple construction is achieved if the cylinder jacket is rotatably supported by means of two bearing pieces arranged at its two ends on a shaft which engages in the cylinder jacket and is rotatably supported at least on one side in a device frame, and the cylinder jacket with the shaft via a shaft surrounding and in the cylinder jacket arranged single or multi-part spiral spring tension is connected, one end of which is connected directly or indirectly to the shaft and the other end at a predetermined distance from one end to the cylinder jacket.

Preferably, in order to avoid the shaft being supported in flight, the one bearing piece for the rotary mounting of the cylinder jacket is also rotatably mounted in the device frame. In the configuration of the spring device as an internal spiral spring balancer, it is possible that the spiral spring balancer is constructed in a modular manner to adapt to the length of the cylinder jacket and consists of at least two end spring brackets coupled to the shaft or the cylinder jacket and at least one intermediate spring bracket rotatably mounted on the shaft between the end spring retainers there, the one spring between the one end spring holder and the central spring holder and the other spring between the central spring holder and the other end spring holder is suspended.

Since a thin shaft can advantageously be used for the rotary mounting of the roller provided with the spring device, it is expedient if guide sleeves and / or guide ball bearings are arranged for guiding or supporting the springs between the springs and the shaft, which are set when the desired preload is set and / or change in spring tension during operation prevent the display device from applying the spring to the shaft itself.

It may be advantageous if both rollers are designed as compensation rollers in which the cylinder jacket is connected to the shaft via a spring device. In this way, the required pretension can be applied by both rollers if necessary.

The two rollers can preferably be driven at the same speed in that a motor, preferably a geared motor, is arranged on the shaft of a roller and the two shafts are coupled to one another via a rotating drive member.

Figur 1

eine perspektivische Darstellung zur Erläuterung der Grundidee der Erfindung,

Figur 2

einen Längsschnitt durch eine Kompensationsrolle,

Figur 3

einen Schnitt durch eine Rolle ohne Kompensation,

Figur 4

eine schematische Darstellung einer Vorrichtung mit 2 Kompensationsrollen,

Figur 5

eine schematische perspektivische Darstellung einer Anordnung vergleichbar Figur 1, jedoch mit 2 Umlenkrollen,

Figur 6

schematische Darstellungen zur Erläuterung der unterschiedlichen Umfangsgeschwindigkeiten und Wirkung der federelastischen Vorspannung

Gemäß Figur 1 wird ein Anzeigenband 1 von einer Rolle 2 auf eine Rolle 3 aufgewickelt und umgekehrt. Das Auf- und Abwickeln erfolgt diskontinuierlich, so daß der zwischen den beiden Rollen 2 und 3 während einer vorgegebenen Zeit stillstehende Bandbereich von Betrachtern in Ruhe betrachtet werden kann.The invention will now be explained in more detail with reference to the accompanying figures. It shows:

Figure 1

2 shows a perspective illustration to explain the basic idea of the invention,

Figure 2

a longitudinal section through a compensation roller,

Figure 3

a cut through a roll without compensation,

Figure 4

1 shows a schematic representation of a device with 2 compensation rollers,

Figure 5

2 shows a schematic perspective illustration of an arrangement comparable to FIG. 1, but with 2 deflection rollers,

Figure 6

schematic representations to explain the different peripheral speeds and effect of the elastic preload

According to FIG. 1, an advertising tape 1 is wound up from a roll 2 onto a roll 3 and vice versa. The winding and unwinding is carried out discontinuously, so that the band area which is stationary between the two rolls 2 and 3 for a predetermined time can be viewed by viewers in peace.

The roller 2 consists of a shaft 4 rotatably mounted in a device frame (not shown) and a cylinder jacket 5 rotatably mounted on the shaft 4, which has guide disks 6 and 7 at both ends. Between the shaft 4 and the cylinder jacket 5, a spiral spring cable 8 is arranged, one end of which is connected to the shaft and the other end of which is connected to the cylinder jacket 5. The spiral spring tension is under a predetermined prestress and seeks to pull the band in the direction of the arrow P shown in FIG. 1.

The cylinder 3 consists of a cylinder jacket 10 connected in a rotationally fixed manner to a rotatably mounted one-part or multi-part shaft 9. On the shafts 4 and 9, gear wheels 11 and 12 are arranged, around which a toothed belt 13 is guided. On the shaft 11, a motor 14 is arranged connected to the device frame, not shown. The drive motor can also be arranged on the shaft 9 or engage in the toothed belt 13 separately from the shafts.

A preferred construction of the roller 2 is shown in FIG.

The shaft 4 is rotatably supported at its upper end in a bearing 15 in a device frame 16 and engages in the cylinder jacket 6 from above. The upper end of the cylinder jacket is rotatably supported on the shaft by means of a ball bearing 18 via a bearing piece 17 connected to it in a rotationally fixed manner. The lower end of the cylinder jacket is via a further bearing piece 19 and a ball bearing 20 is mounted on the lower end of the shaft 4 which does not completely penetrate the cylinder jacket 5. The bearing piece 19 in turn is rotatably supported by a further ball bearing 20 'on a bearing bolt 21 screwed to the device frame 16.

At a distance from the bearing bush 19, a lower end spring holder 22 is connected in a rotationally fixed manner to the shaft 4, which is provided at its end facing away from the bearing piece 19 with a guide projection 22a, over which a guide sleeve 23 is pushed, which is also on the shaft at its upper end 4 is supported. The support shown is via a ball bearing. Here, however, essentially only a non-rotatable support is required, since there is no relative rotation between shaft 4 and sleeve 23.

At a distance from the free end of the guide sleeve 23, an intermediate spring holder 24 is rotatably arranged on the shaft 4 by means of a ball bearing 25 and held in position by a snap ring 26. The intermediate spring holder 24 also has a guide projection 24a for receiving a guide sleeve 27, the upper end of which is rotatably supported on the shaft 4 by means of a ball bearing 28. The guide sleeve 27 ends at a distance from the inner end face of the bearing piece 17.

An axial bore 22b is provided in the end spring holder 22 for receiving the axially angled end of a spiral spring 29, the other axially angled end of which engages in an axial bore 24b of the intermediate spring holder 24. An axial bore 24c is preferably provided radially opposite the bore 24b, into which the axially angled end of a further spiral spring 30 engages, the other axially angled end of which engages in an axial bore 17a of the guide piece 17. The circles in FIG. 2 in the vicinity of the receiving bores for the axial spring ends indicate that the spring ends can be fixed in the axial bores by means of screws.

The horizontal dash-dotted lines in FIG. 2 indicate that more than one intermediate spring holder and more than two spiral springs can be used.

The fixing of the end spring holder 22 on the shaft 4 and the fixing of the cylinder jacket 5 on the bearing piece 17 are carried out by the screws 31 and 32 shown in the figure. The fixing is carried out in such a way that the spring tension 8 constructed from the springs 29 and 30 is in the desired position Biasing direction has a predetermined bias, ie the springs are biased in the tensioning direction by several rotations of one end of the spring balancer relative to the other end.

In the roller 3 shown in Figure 3, the cylinder jacket 10 is rotatably supported by means of a bearing piece 33 having a shaft end 9 and a ball bearing 34 at one end in the device frame, while the other end via a bearing piece 35, a ball bearing 36 and one with the Device frame 16 screwed bearing pin 37 is rotatably mounted.

In the embodiment according to FIG. 4, it is indicated schematically that not only one roller is designed as a compensation roller, but both rollers can be configured as compensation rollers 38 and 39, each with its own compensation spring balancer 40 and 41, respectively. In the figure, the compensation spring balancers are only shown with half the length, since, for example, they can each contribute half to the build-up of the pretension, as is shown schematically by the arrows P / 2 in FIG.

FIG. 5 differs from FIG. 4 only in that the rollers 2 and 3 are connected upstream in the case of rotatable deflection rollers 42 and 43, as in the prior art.

The mode of operation of the method and the device according to the invention will be briefly explained with reference to FIGS. 6a, 6b and 6c:
Both shafts 4 and 9 rotate clockwise under the influence of the toothed belt 13. 6a there is a winding of larger diameter on shaft 4 and a winding of smaller diameter on shaft 9. Because of the same speed of rotation of the shafts, the instantaneous peripheral speed of the winding on shaft 4 is greater than the instantaneous peripheral speed of the winding on shaft 9. In other words, less length of tape is unwound per unit of time than the winding on shaft 4 can record according to its peripheral speed. The elastic pretension applied by means of the spring device and represented by the dotted arrow P in FIG. 6a, which attempts to pull the winding on the shaft 4 in the direction of rotation, enables the winding on the shaft 4 to "lag" with respect to the shaft and compensates for it high peripheral speed, the spring tension P is increased.

In the phase according to FIG. 6b, in which the windings are just the same size, no compensation is required.

FIG. 6c shows the start of unwinding when the large roll is on the right shaft 9. Both shafts 4 and 9 rotate at the same speed. The peripheral speed of the right winding is greater than the peripheral speed of the winding located on the shaft 4, ie the winding on the shaft 4 can absorb less tape than is offered by the winding on the shaft 9. However, since the spring-elastic device 8 is located between the shaft 4 and the winding, the winding can “lead” under the spring-elastic pretension of the rotary movement of the shaft 4. The tension P of the spring balancer is reduced.

During the winding from one shaft to the other, the spring tension changes from a predetermined maximum value to a minimum value and vice versa. However, the direction of the spring tension always remains the same, so that the band section between the windings on shaft 4 or shaft 9 always remains tensioned.

Since the springs could already contact the shaft 4 in the prestressed state and / or when the spring tension changes, the guide sleeves 23 and 27 are provided to support the springs. In order to prevent the springs from being placed in the free spaces between the free ends of the guide sleeves 23 and 27 and the intermediate spring holder 24 or the bearing piece 17, guide ball bearings 23a and 27a rotating with the shaft are also arranged there.

Claims (8)

Method for rolling advertisements arranged in the form of a tape, whereby the tape rolls off a driven first roller and rolls onto a driven second roller and vice versa, if necessary using deflection rollers, characterized in that both rollers are driven at the same speed and that Band between the two rollers is held under a spring elastic bias applied by at least one of the rollers. Method according to claim 1, characterized in that the pretensioning is applied by only one of the two rollers or in part by both rollers. Device for unrolling advertisements arranged in the form of a tape with a first driven roller and a second driven roller for receiving the tape and possibly with deflection rollers, each driven roller having a rotatably mounted cylinder jacket for receiving a tape roll and a rotatably mounted driven shaft, characterized in that, in the case of at least one roller (2; 40, 41), the shaft (4) is connected to the associated cylinder jacket (5) via at least one spring device (8) pretensioned in the winding direction. Device according to claim 3, characterized in that the cylinder jacket (5) is rotatably supported by two bearing pieces (17; 19) arranged at its two ends on a shaft (4) which engages in the cylinder jacket and is rotatably supported on at least one side in a device frame, and the cylinder jacket with the shaft (4) over a one-part or multi-part spiral spring tension (8) surrounding the shaft and arranged in the cylinder jacket is connected, one end (22) of which is connected to the shaft (4) and the other end (17) of which is at a predetermined distance from one end (22) of the Cylinder jacket (5) is directly or indirectly connected. Device according to claim 3 or 4, characterized in that a bearing piece (19) for the rotary mounting of the cylinder jacket (5) is also rotatably mounted in the device frame (16). Device according to at least one of claims 3 to 5, characterized in that the spiral spring tension is constructed in a modular manner (29, 30) to adapt to the length of the cylinder jacket and consists of at least two end spring holders (19, 17) and are firmly coupled to the shaft or the cylinder jacket at least one intermediate spring holder (24) rotatably mounted on the shaft between the end spring holders, one spring (29) being suspended between the one end spring holder and the central intermediate spring holder and the other spring (30) between the central spring holder and the other end spring holder. Device according to at least one of claims 3 - 6, characterized in that guide sleeves (23, 27) and / or guide ball bearings (23a, 27a) on the shaft for guiding or supporting the springs (29, 30) on the shaft (4) 4 are arranged. Device according to at least one of claims 3 to 7, characterized in that both rollers (38, 39) are designed as compensation rollers, in which the cylinder jacket is connected to the shaft via a spring device (40, 41).

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