SU933592A1 - Tensioning device - Google Patents

Description

(54) STRETCH DEVICE

one

The invention relates to devices for adjusting the tension of the webs and can be used to stabilize the tension of the paper tape in the printing technique.

Known Tension regulator of paper web containing actuator, actuator speed sensor, pneumatic cylinder, reduction pneumatic valve connected to pneumatic cylinder, web tension sensor, floating roller connected through a lever with pneumatic cylinder stem and control unit, rolled a brake connected through the control unit to the web tension sensor and to the drive speed sensor, and guide rollers. The floating roller performs three functions: control of the roll brake, creation of a reserve of the web to compensate for the mismatch of the speeds of the machine and the roll, damping of high-frequency oscillations of tension, or 1.

A disadvantage of the known device is that it does not provide tension control for the paper-like web with automatic change of rolls, which is characterized by an increased amplitude of oscillation of the web tension, as a result of which a web break is possible.

The purpose of the invention is to increase the reliability of automatic roll change.

The goal is achieved by the fact that the tensioning device contains an actuator, an actuator speed sensor, two cylinders and two pressure reducing valves connected with them, a web tension sensor, floating rollers, two levers, a control unit, a roll brake connected through the unit

 control to the fabric tension sensor and to the drive speed sensor, the first floating roller is connected through the first lever with the rod of the first pneumatic cylinder and with the belt tension sensor, and two

j other floating rollers are connected through the second lever to the stem of the second pneumatic cylinder and to the regulator of the second reducing pneumatic valve.

The drawing shows a diagram of a tension device.

Claims (1)

20 Roll star 1 bears on its rays a new roll 2 and the remainder of an unwinding roll 3. On the roll axes, electromagnetic powder brakes 4 are located, controlled by a floating roller 5 through the selsyn b and control unit 7. To correct the tension system when changing The speed of the machine is provided by a tachogenerator 8 associated with a printing aggater. The floating roller 5 is connected by means of levers 9 with a tension adjuster made in the form of a pneumatic cylinder 10 that balances the tension of the paper web 11. The pressure regulator 12 changes the degree of web tension, if necessary. The pressure regulator 13 to which air is supplied through the regulator 12 is connected with oscillating levers 14, carrying paper rolls 15 and 16. To balance the effect of web tension, the pneumatic cylinder 17 is installed on the levers 14, the air in which is supplied from the regulator 13. Diameter Indra 17 and characteristic pressure regulator 13 are chosen so that the average position of levers 14 the pressure in the cylinder 17 corresponds to the nominal tensioned paper web on the far right position it is somewhat leaching, and in the extreme left - lower. This is necessary to return the levers 14 to the middle position after eliminating the disturbance. The stability of the support arms 18 is ensured by a parallel mechanism with the mechanism 19. The device operates in the following manner. When the paper web on roll 3 ends, the melting roller 5 is in a position close to the leftmost one; the braking moment on the roll axis is minimal, the levers 14 with rollers 15 and 16 are in a position close to the middle one, since it is just married. The rotation of the roll star 1 is turned on, the new roll 2 takes up its original position and is accelerated by the acceleration mechanism 20 to the speed of the maschine. The gluing mechanism 21 presses the web running down from the remainder of the roll 3 to the surface of the new roll with the adhesive envelope applied, and gluing occurs. If at the time of gluing the speed of the new roll differs from the speed of the machine, the floating roller 5 moves, compensating for this inaccuracy and correcting the braking torque of the roll brake. In the case when the approach of the floating roller 5 to the stop, the speeds of the maschine and the new roll are not yet comparable, in comparison with the abutment. the jerk of the web moves the levers 14, the coig; retirement speed mismatch. Thereby, the tension level varies somewhat, but the paper web remains intact. At the end of the automatic gluing cycle, the levers 14 return to the middle position as the tension recovers. The application of the invention allows to increase the reliability of automatic gluing and speed of the mash during this operation. In addition, the accuracy of stabilization of web tension will increase, especially in transient modes of operation of the machine, the cooldown will decrease during an emergency stop of the machine and the amplitude of high-frequency oscillations of the paper web tension will decrease. Claims Presently, a predominantly paper field device comprising an actuator, an actuator speed sensor, a pneumatic cylinder, a reducing pneumatic valve connected to the pneumatic cylinder, a web tension sensor, a floating roller connected through a lever to the pneumatic cylinder and the web tension sensor, control unit , rolled brake, connected through the control unit to the web tension sensor and to the drive speed sensor, and guide rollers, characterized in that, in order to increase the reliability of operation After reloading the web, it has an additional pneumatic cylinder, a reducing pneumatic valve connected to each other, and an additional lever, and the guide rollers are mounted so that they can move under the tension of the web and connected via an additional lever to the additional pneumatic cylinder and the regulator of the additional reducing pneumatic valve. . Sources of information taken into account during the examination 1. USSR author's certificate No. 642250, cl. B 65 N 25/22, 1976.