SU1542887A1 - Arrangement for regulating tension of continuous material - Google Patents

Description

The invention relates to a device for rewinding roll materials and can be applied in the textile, chemical industries, in particular for rewinding thin

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membrane materials. The purpose of the invention is to improve the accuracy of regulation. When the tension force of the material changes, the probe 11 under the action of the coil spring 13 rotates around the axis 4, the nut 8 unscrews the sleeve 7, which, moving along the axis 4, additionally compresses the spring 6, thereby increasing the braking torque. To increase the sensitivity of the device, the thread of the screw pair is made micrometer step. The probe 11 is attached to the nut 8 by a clamp at such a distance from the axis 4 of the bobbin holder so that the nut 8 starts to turn on the sleeve 7 with the minimum allowable change in the tension of the web of roll material 3. 1 hp, f-ly

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The invention relates to devices for rewinding roll materials and can be applied in the textile, chemical industries, in particular for rewinding membrane materials.

The purpose of the invention is to improve the accuracy of regulation.

FIG. 1 shows a device, a vertical section; in fig. 2 view A in FIG. 1 (turned); in fig. 3 is a diagram of the decomposition of forces at the point of contact of the probe with the material.

A device for regulating the tension of long materials (Fig. 1) contains a bobbin holder 1 with a bobbin 2 of rolled material 3 installed therein. On the axis 4 of the bobbin holder there is a friction clutch 5 with means for changing the force of pressing its disks, including a spring 6 and a screw pair in the form of a sleeve 7 and nuts 8. On the axis of the bobbin holder there is an adjusting nut 9, which through the washer 10 interacts with the nut 8 of the screw pair, and the sleeve 7 of the screw pair interacts with the spring 6. On the nut of the screw pair there is a probe 11, which ystvuet web with the web material. The probe is fixed on the nut with the possibility of permutation with the help of the clamp 12. On the screw pair there is a flat spiral spring 13 of low rigidity which is fixed at one end to the hub 7 of the screw pair and the other 'on the probe 11.

The device works as follows.

Before working with the adjusting nut 9, a pre-compression of the spring 6 is created, which, acting on the friction clutch 5, creates a preliminary braking torque. During unwinding, the web material 3 is in a stretched state. Under the action of the coil spring 13, the probe 11 presses on the rolled material with an effort P

• 3. The web of roll material 3, when unwinding, bends at the point of interaction with the probe 11 with respect to the ideal trajectory of the web movement. The two folded sides of the web form an angle with / between them. The ratio between the tension force

P canvases unwinding material 3, as well as the force pressing P the probe 11

on the canvas and corner oh! , on which the web of web material 3 bends, is expressed by the dependence

2 cos - The schematic decomposition of forces at the point of contact of the probe with the material is shown in FIG. 3 <. From this dependence, it follows that when the tension force P of the web of roll material 3 is changed, the angle of the web deflection changes and the probe 11 rotates about axis 4 under the action of the spiral spring 13. The angle that the probe 11 rotates around axis 4 is small and the stiffness of the spiral spring 13 is small therefore, the magnitude of the force P in this case fluctuates in very small limits, the force P can be taken as a constant value. Since the mass of the probe 11 is small, the forces of inertia when moving the probe are small and do not have a significant impact on the operation of the device.

If, during operation, the tension of the web of the rolled material 3 is weakened, then the force H decreases. According to the above dependence I, the angle </ decreases as well as the additional sag of the web of the rolled material. The probe 11, mounted on the nut 8 screw pair, under the action of the coil spring 13 rotates around the axis 4. Nut 8 unscrews the sleeve 7, which, moving along the axis 4, additionally compresses the spring 6, thereby increasing the braking torque. This increases the force E and the angle o (, the trajectory of the unwound web of rolled material returns to its previous position.

To increase the sensitivity of the device, i.e., the ability to respond to the slightest changes in the web tension, the thread of the screw pair is made in micrometric steps, and the probe 11 is attached to the nut 8 by the clamp 12 at such a distance from the axis 4. of the bobbin holder so that the nut 8 begins to rotate on the sleeve 7 with the minimum allowable change in the tension of the web of roll material 3.

The proposed device has a comparative simplicity, manufacturability, low cost,

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as it consists of a small number of parts. In addition, it has less inertia and high speed compared to devices where the tension is controlled by the weight of its individual elements, since the mass of moving parts (probe) is small and does not affect the operation of the device.

Claims (2)

Claim 1. An apparatus for controlling the tension of a lengthy material, comprising a friction clutch mounted on an axis of a bobbin holder with a means for changing the force of pressing of disks made in the form of a screw 1542887 ⁶ the pair, the screw of which is spring-loaded to the discs and is made in the form of a sleeve installed slidably along the axis of the bobbin holder, and a spiral spring, characterized in that, in order to increase the control accuracy, it has a probe for contacting with the material installed on the nut of the screw pair and connected with one end of the coil spring, while the other end is attached to the hub of the screw pair. 2. Device by π. 1, this is due to the fact that the thread of the screw pair is made micrometric, and the probe is attached to the nut with the possibility of permutation. VIZ A