Apparatus for treating an endless material.

The invention relates to a device for treating a continuous product such as a textile web, in particular broad-washing machine, with a plurality of upper guide rollers of which at least one is provided with a drive, a plurality of lower guide rollers and an input side arranged, pneumatically or hydraulically adjustable, the setting the desired fabric tension causing dancer roller, at least one of the deflection rollers is provided with means for measuring the force exerted by the product on this power and (the) drive (s) of the upper roller (s) is controlled depending on the measured force ( will).

From DE-OS 34 19 487 a device of the aforementioned kind is known, in which a textile web or the like is guided via a plurality of upper and lower guide rollers, wherein at least some of the upper guide rollers are provided with drives. Further, a dancing roller is provided, which effects the desired fabric tension. The drives are controlled via a signal corresponding to the difference between the forces exerted on the textile web on two of the rolls.

Thus, the existing in two different places goods voltage is measured in the previously known method and used to control the drives.

The control behavior of this known device is insufficient.

The invention is based on the aforementioned device form such that it is in better control behavior the task.

This object is achieved in that an outlet side arranged, non-driven guide roller is provided with the means for measuring the force exerted by the goods on this force and a control means for controlling the (the) drive (drive) of the roller (s) by comparing a pneumatic loading of the dancer roller corresponding setpoint is provided with the measured at the output side deflecting roller through the central force.

A preferred embodiment is characterized in that the control device a nominal value input, to which a pneumatic and hydraulic pressure with which the dancer roller is applied, directly abuts corresponding signal, and a feedback input, to which an on of the goods the output side deflecting applied pressure applied corresponding signal has.

It can be provided that the control device is a thyristor power supply.

A first embodiment is characterized in that the adjustment of the pressure with which the dancer roller is acted upon, via an adjustable pressure reducer, a pressure / current converter via a matching amplifier generates the first target value Engang the control device supplied signal.

An alternative embodiment is characterized in contrast, is characterized in that the adjustment of the pressure with which the dancer roller is acted upon, via a fitting at the set value input potentiometer, a matching amplifier and a current / pressure transducer are provided.

In both cases, it may be provided that all the upper guide rollers are provided with variable-speed drives.

It is further proposed that the means are designed as force-sensing.

Further features and advantages of the invention will be apparent from the drawing, are shown schematically in the embodiments of the invention. In which:<ul><li>Fig. 1 shows a first embodiment of the invention, and</li><li>Fig. 2 shows a second embodiment of the invention.</li></ul>

The device consists of a plurality of received in a housing 54 upper guide rollers 10, 12, 14, which are each driven by drives 16, 18, 20, and non-driven lower rollers 22, 24, 26, 28, 30 and one between the input-side lower rollers 22, 24 arranged pendulum roller 32 (to the extent corresponding to the apparatus largely the previously known from DE-OS 34 19 487 apparatus).

In both embodiments, the last of the lower guide rollers 30 is provided with Kraftmeßlagern 34, whose output signal is supplied to a feedback signal input 40 of a control device 36th This embodied as thyristor power supply control device 36 acts on the drive 16, 18, 20 of the upper guide rollers 10, 12, 14 (although in the illustrated embodiments, all three upper guide rollers is provided with separate drives, it is also sufficient if only one or two upper rollers 10, 12, 14 is driven, or are driven).

In the embodiment shown in Fig. 1, a manually adjustable pressure regulator 42 is provided which acts on the pendulum roller 32. Via a pressure / current converter 44, the pressure with which the dancer roller 32 is acted upon, converted into an electrical signal which is applied via a matching amplifier 46 to a setpoint signal input 38 of the control device 36th

The embodiment of Fig. 2 differs from that of FIG. 1 in that here the voltage applied to the setpoint signal input 38 to manually dial value is determined by a potentiometer 48, wherein said electrical signal via a matching amplifier 50 and a current / pressure transducer 52 is applied to the dancer roller 32nd

The over the prior art improved control performance of the device based on the fact that no two actual values ​​are compared with each other, but the radiation emitted by the controlled system control quantity (namely, the force at the last of the deflecting rollers 30) is compared with a predetermined desired value. The input manually entered will be given for this purpose at the same time on fine actuator compensator roller 32 and the control system consisting of the thyristor supply unit 36, the drive 16, 18, 20 and the force means 34th

The provision of a pressure / current converter 44 and a current / pressure transducer 52 and the adjustment amplifier 46 or 50 is based on that dancer roller 32 and the thyristor power supply of its input variables difference Licher form, namely the one hand, pneumatically or hydraulically and on the other hand electrically need.

The features disclosed in the foregoing description, in the drawing and in the claims the invention may be substantially different embodiments for the realization of the invention both individually and in any combination.

LIST OF REFERENCE NUMBERS

10 deflecting 12 deflecting 14 deflecting 16 drive 18 drive 20 drive 22 deflecting 24 deflecting 26 deflecting 28 deflecting 30 deflecting 32 pendulum roller 34 measuring means 36 control device 38 setpoint input 40 actual value input 42 Pressure reducer 44 Pressure / current converter 46 matching amplifier 48 potentiometer 50 matching amplifier 52 current / pressure transducer 54 housing