DE8615787U1 - Unwinding device - Google Patents

Description

Wolff Walsrode AG 3030 Walsrode-Bomlits

Str / bo / c

Unwinding device

The present innovation relates to an unwinding device for highly elastic tapes or thread, which consists of a drive unit for the controlled unwinding of the highly elastic material and a position control unit, comprising a displacement transducer for the tapes or threads, with the help of which via the position control and the one coupled with it Drive control the unwinding speed of the tapes or threads is regulated.

There is a need for devices for unwinding highly elastic materials, in particular highly elastic tapes or threads with a tension-free as possible regulated speed, preferably equal to the processing speed of highly elastic materials to avoid overstretching them. Farther the device should have no mechanical or electrical connection with the processing machine of the elastic material to be independent of mechanical and electric adjustment carbines one at a time functional unwinding device available too to have.

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This is achieved with the new unwinding device for highly elastic materials, preferably tapes or Threads made of elastomeric plastics * which are characterized by this is that it is made up of

1, a drive unit, consisting of the roller (1) with wound elastic material (la), the with its own weight minus an adjustable counterweight on the drive roller (2), preferably Al roll, which is via a gear (4) and a variable-speed motor (3) with a the drive control (5) which regulates the drive speed, which is specified by the setpoint is and

2. a position control unit, consisting of two pulleys (6 and 7), a displacement encoder (8) arranged between them and one arranged between them Guide roller (8b) for guiding the elastic material, whereby the roller (8b) is arranged in a predetermined position of a possible route, and one with the Position control connected to the position encoder (9), which is coupled to the drive control

In Figure 1, the roll-off device according to the innovation is shown schematically.

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In Figure 2, the drive unit, in Figure 3 ^ control unit with inductive displacement encoder and in Fig, the position control unit shown with optical displacement encoder.

In Figure 1 it is shown in detail how the

* "driving role with the help of a drive control (5), the with appropriately known control loops is set out; (such as a DC drive or a variable speed drive Three-phase drive with 2 directions of rotation and torque) including a variable-speed drive

* 5 Motor (3) and an attached gearbox (4) to which the Drive roller (2) is coupled, which drives the roller (I) * with the highly elastic material to be unrolled. This roll of material is on a foldable, one-sided mounted axle (Ib) and rests with its own weight minus an adjustable counterweight the drive roller (2), this drive roller is made using the drive control to a preset by the setpoint The speed that corresponds to the processing speed is maintained. So that the unrolling of the elastic material as possible without overstretching, i.e. as free of tension as possible, and thus the rolling speed is equal to the processing speed can be held, the elastic material (la) is over the pulley (6) and over the guide

"*" roll (8b) of a preferably inductive displacement encoder before it is passed over the deflecting roller (7) from the Feed rollers (10a, 10b) are conveyed to the processing machine. This one preferably used

inductive displacement encoder consists of a cylinder (8c) and 35

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a Taüchankör (8a) j the at its upper end ^ small plastic roller (8b) as a guide wears, over which the elastic ribbon or the thread to be led. With the help of the position control (9), the roller, and

so that the elastic material, preferably in the middle * ® of a possible path (the so-called zero position)

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set. At the beginning, the ribbon is manually fed from the roll (1) via the deflection roller (6) and the transfer roller (8b) via the second deflection roller (7) into the processing machine. The total weight of the plunger armature and the roller (8b), which may be present, is small, but it is sufficient to provide the necessary tension to unroll the elastic material, ie sufficient tension to continuously detach it from the roller. This value of the position encoder in the zero position is passed on via the position control as a setpoint to the drive control coupled with it. To now largely to be attained a constant processing speed draft-free and avoid any overstretching of the elastic Mate "· rials by a sudden increase in Verarbeitsgeschwindigkeit, any change in the situation is the displacement transducer from the zero position as a change of Sollwei- tes from the position control immediately to the coupled Drive control passed on, which - according to the change - controls the drive speed of the drive roller and thus the unwinding speed of the elastic material according to the processing speed, so that the displacement encoder returns to the zero position.

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m returns. The low weight of the encoder also has

I'm your advantage that any sudden change in the

I working speed to not overstretch the too

I processing material leads because of the Weggeber

I its low weight easily out of the zero position

I can be accelerated before irreversible expansion

i | * ^ tion of the material occurs,

I In Figure 2, the drive unit is detailed, ordered starting from the roll (1) with the elastic to be unrolled

I material (la) that is stored on a foldable, one-sided

? * ® device axis (Ib) is clamped on, and the drive roller ΐ

(2), which are equipped with an attached gear (4) and a

J with a connected variable-speed motor (3) and a

I speedometer (3a) is connected, shown. The drive mechanism

I direction rests on the base plate (14), in the case of unfavorable

j. *** Stability conditions, possibly due to

a strongly fluctuating processing speed, can

κ a basic setpoint for the roll control with the help of the

jS Anlegetachos (11) from the processing machine with the help

I the application roller (13), the gear coupling (12) over the

I * ° Anlegetacho (11) - applied to a pull-in roller of the Vei-

v: processing machine - can be specified. The fine control

i then takes place via the position control.

1 Figure 3 represents the displacement encoder (8) as an inductive displacement encoder

i and the pulleys (6) and (7). The inductive path

give consists of the plunger (8a), at the end of which the plastic roller (8b) acts as a guide roller with the elastic material (la) carried over it, and the cylinder (8c) together. The whole arrangement is on one with the help of clamping bars (15) Stand (16) attached to a base plate (14),

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The position control (9) takes place with the help of known level circles.

It is also possible to change the position of the guide roller in the To concomitantly with the help of an optical device

troll
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Figure 4 shows the displacement encoder (8) and the pulleys (6) and (7) as an optical displacement encoder. There is the optical Transmitter from a light transmitter (8e) and a light receiver (8f). Between the transmitter (8e) and receiver (8f) there is a light ray field (8g) as well as that Guide lines (8b) with the elastic over it Material (la). The transmitter (8e) and receiver (8f) are with mounting brackets (17) on a base plate (14) assembled. The pulleys (6? And (7) are on one

* ® retaining plate (18), which in turn is clamped to a stand (16). With this type of displacement transducer, too, the position of the guide roller (8b) is in the middle of a possible path with the aid of the position control

so-called zero position held,
25th

The device according to the innovation for unwinding highly elastic threads or tapes not only has the advantage that the material can be unrolled with a small, defined tension without the risk of overstretching, but rather

3G that you can do it without any mechanical or electrical Connection to subsequent processing machines can be operated, the device is a compact unit that can be easily transported and is ready for use at any time via an electrical plug connection is.

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Claims (2)

♦ · κι protection claims 1. Unwinding device for highly elastic materials, preferably tapes or threads made of elastomeric materials Plastics, characterized in that they is built from
10 1. a drive unit, consisting of the roller (1) with wound elastic material (la) with their own weight minus an adjustable counterweight on the * Drive roller (2), which lies over a Gear (4) and a variable speed motor (3) with a die -by the setpoint specified - drive speed regulating Drive control (5) is connected, and 20 2. a position control unit, consisting of two pulleys (6 and 7), one in between arranged displacement sensor (8) and a guide roller (8b) arranged in between for the * "elastic material (la), with the roll (8b) is arranged in a predetermined position of a possible route, and one Position control (?) connected to the position encoder · which is coupled to the drive control. 30th Unwinding device according to claim 1, characterized in that that inductive or optical displacement transducers are used as displacement transducers WW 5 243 t i