EP0968492B1 - Device for driving a large dimension film, in particular advertising posters supported by an unwinding strip, screen and advertising vehicle comprising same - Google Patents

Abstract

The invention concerns a device for driving a large dimension film, in particular advertising posters supported by an unwinding strip, between a drive roll (29) and a receiving roll (30), only one of the rolls is driven by an electric motor, the other being driven by coupling means including a flange connected to the motor roll, said flange driving the second roll via a spring.

Description

The present invention relates to large film training area dimensions such as advertising posters supported by a moving strip. By large dimensions we will hear dimensions of the order of the meter and more, as opposed to the mechanisms for training small films such as as motion pictures or tapes magnetic recordings, which fall under a very distant technical field, and outside knowledge of a person skilled in the art specific to the present invention.

We also know by patent European EP487791 a scrolling sign in which the opposite ends of a strip are wrapped around a first and a second roller so that the strip can run one linearly in front of a display area in winding on either of the rollers under the control of an electric motor. Engine electric is a reversible electric motor mounted inside the first roller. A spring at constant force spirally wound is arranged to the inside of the second roll to stretch the tape between the rollers.

We also know by demand international patent WO 94/20945 a device for training a large film, including advertising posters, supported by a moving strip, between a motorized roller and a take-up roller, only one of the rollers is driven by an electric motor, the other roller being driven by a means of coupling to the roller motorized by means of a spring.

The invention relates in its acceptation the most general training of a great film dimension, in particular of advertising posters, supported by a moving strip, between a motor roller and a take-up roller one only rollers is driven by a motor electric integrated inside one of the rollers, the other roller being driven by a means of coupling to the roller motorized by through a spring characterized in that one of the rollers has a pulse sensor delivering a signal to a control circuit of the motorized roller rotation speed for control the acceleration and deceleration of the film scrolling.

Advantageously, the flange of the means of coupling is driven by a toothed belt.

According to a preferred embodiment, the outside diameter D1 of the rollers is significantly higher than D2-D1 where D2 denotes the outside diameter of the entire wound film on one of the rollers.

The drive motor is integrated into the inside of one of the rollers.

The upper roller has a pulse sensor delivering a signal to a speed control circuit of the motorized roller to control acceleration and the deceleration of the film's progression.

According to a particular variant, the film has metallic bands indicating the start of a sequence when passing in front of a Inductive sensor.

According to another variant, the device has a control circuit memorizing the drive engine command file.

• les figures 1 et 2 représentent des vues selon deux plans de coupe perpendiculaire du dispositif selon un exemple de réalisation de l'invention.

The invention will be better understood on reading the description which follows, concerning a nonlimiting example of embodiment of the invention, and referring to the appended drawings where:

• Figures 1 and 2 show views along two perpendicular sectional planes of the device according to an exemplary embodiment of the invention.

The device consists of two rollers, a drive roller (29) and a roller receiver (30). These rollers (29, 30) are formed by aluminum tubes with an outside diameter of 166 millimeters, and a length of the order of 10 foot.

An electric motor (1) comprising a known type of reducer is housed inside the motor tube (29). The axis of the motor drives the motor roller (29) via a cylindrical flange (9), with an outside diameter substantially equal to the inside diameter of the roller motor (29), a screw ensuring the blocking of this flange (9) relative to the drive roller (29).

The motor body (1) is supported by a fixing bearing (5) fixed to the frame by a fixing flange (6).

A toothed drive pulley (4) is fixed on a flange (2) secured to the end of the motor roller (29) via a screw blocking (3).

The opposite end of the drive roller (29) is closed by a flange (10) having a axis (11) cooperating with a bearing (14) mounted on a support (18) ensuring the connection with the frame.

An inductive sensor (16) is arranged at the look of the flange (10). It is fixed on the support (18) via a socket (17). This sensor detects the passage of marks metal provided on a coded disc (12) shown from the front in Figure 2.

This sensor delivers signals representative of the position and speed of rotation of the upper roller. These signals are exploited, not to enslave the speed of rotation of the lower roller, but to control single engine acceleration or deceleration depending on the position of the film driven by the device.

The take-up roller (30) is fixed on the frame at one of its ends by through a flange (31) having a axis (111) cooperating by a bearing (114) with the support (19) for connection to the frame. The other end also has a flange (32) integral with the roller (30) via a radial screw.

A receiving gear (37) is driven by a toothed belt (39) transmitting the movement of the drive roller. A spiral spring (34) is wound around an axis of reception (33). This spring is secured by one the ends of the flange (38) integral with the take-up roller (30), the other end of this spring being integral with receiving toothed wheel (37).

The functioning of this mechanism is the following: the toothed belt (39) drives the receiving gear (37) the torque is transmitted to the roller through the spring hairspring (34). This spring provides on the one hand the adequate tension of the film which is driven from the drive roller (29) to the take-up roller (30). It also has a compensation function the angular difference between the drive roller (29) and a take-up roller (30) which occurs during film scrolling. For example, for a film supporting 11 posters 2 meters high, and with a thickness of 0.185 millimeter, driven between a drive roller (29) and a take-up roller (30) with a diameter of 166 millimeters, the angular deviation between the start of scrolling and the end of scrolling is 0.9 turns. This angular deviation is easily caught by a spiral spring multispire, formed by the winding of a fifteen turns of steel wire on a mandrel.

A tensioning mechanism ensures tension of the toothed belt. This tensioning mechanism is consisting of a roller (41) with a diameter of 50 millimeters supported by a pivoting lever (41) with respect to a central axis. The roller (41) is pushed against the toothed belt by a spring (42).

In addition, two rolls of one 80 mm diameter ensure the lateral positioning of the visible surface of the movie. These rollers are arranged above and below of the poster visible through a window practiced in the frame, and repels the film in a constant plane, independent of diameter winding and unwinding.

The invention is described in what precedes by way of nonlimiting example. It is understood that a person skilled in the art is capable of realize different variants of the invention without however, outside the scope of the patent, in in particular, the film may consist of a succession of posters, either printed on a support single, either constituted by an estate posters linked by their side bands.

Claims (8)

1. Driving system of large-size films, especially of advertising posters, supported by a scrolling strip, operating between a driving roller (29) and a winding roller (30). The roller driven by an electric motor is the one that integrates it. The other roller is coupled to the driving roller through a spring and driven by the coupler device. The characteristic is that one of the rollers includes a pulse sensor that emits a signal to a rotation speed control circuit of the driving roller to control the acceleration and deceleration of the film scrolling.
2. Driving system of large-size films, especially of advertising posters, supported by a scrolling strip, according to claim 1. The characteristic is that the coupler device flange is driven by a synchronous belt.
3. Driving system of large-size films, especially of advertising posters, supported by a scrolling strip, according to any claim hereabove. The characteristic is that the outside diameter of the rollers D1 is far superior to D2 - D1 considering that D2 is the outside diameter of one roller when the film is entirely wound.
4. Driving system of large-size films, especially of advertising posters, supported by a scrolling strip, according to any claim hereabove. The characteristic is that the outside diameters of rollers are 166 millimetres.
5. Driving system of large-size films, especially of advertising posters, supported by a scrolling strip, according to any claim hereabove. The characteristic is that the film presents metal bands that indicate the beginning of the sequence when passing before an induction sensor.
6. Driving system of large-size films, especially of advertising posters, supported by a scrolling strip, according to any claim hereabove. The characteristic is that it includes a control circuit that stores the driving motor control file.
7. Billboard including a driving system of large-size films according to at least one of claims 1 to 7.
8. Advertising vehicle composed of a power-driven chassis supporting a board including a driving system of large-size films according to at least one of claims 1 to 7.

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