RU1806080C - Device for automatic cutting of strips from rolled materials - Google Patents

Abstract

The invention relates to a means of automating production processes that ensure dosed cutting of rolled materials into segments of a given length, and can be used, for example, for cutting blanks for protective casings of heat-insulating coatings of pipelines. The invention consists in that the device is additionally equipped with a direction indicator, a preliminary adjuster stop command feed mechanism, the second pair of emitter-receiver, while the input of the direction indicator is connected to a linear displacement sensor, and the output with an inertial correction unit, the controller of the preliminary command for stopping the feed mechanism is connected to the input of the unit unit. Actuator controls. 2 C.p. f-ly, 3 ill. ate

Description

FIELD OF THE INVENTION This invention relates to means for automating production processes, which allow dosed cutting of web materials into segments of a given length.

The purpose of the invention is to increase the accuracy of cutting strips in the length.

Fig. 1 is a schematic diagram of a device for automatically cutting strips of web material; figure 2 is a diagram of a directional determinant; Fig. 3 is a diagram of an actuator control unit.

A device for automatically cutting strips of rolled material (Fig. 1) comprises an unwinder 1, a material feeding mechanism 2, a cutting device 3, a linear displacement sensor 4, a block

actuators 5, an actuator control unit 6, the inputs of which are connected to the outputs of the sheet number sensor 7, the sheet length gauge 8, the inertial correction unit 9 and the preliminary stop command adjuster 10, and the outputs are connected to the actuator block 5, the inertial correction unit 9 and a linear displacement transducer 11, the second input of which is connected to a linear displacement transducer 4, and the output is connected to an inertial correction unit 9.

The direction determiner 12 (Fig. 2) contains a trigger 13, a high-frequency generator 14, shift registers 1.5 and 16, equivalence circuits 17 and 18, inverters 19 and 20, and circuits I 21 and 22,

00 about

(About 0

8

w

Direction finder 12 (FIG. 2) comprises a trigger 13, a high-frequency generator 14, shift registers 15 and 16, equivalence circuits 17 and 18, inverters 19 and 20, and circuits I 21 and 22. The direction finder 12 is connected; at the input with a linear displacement sensor 4, at the output, with an inertial correction unit 9.

The actuator control unit 6 (FIG. 3) contains a first coincidence circuit 23 connected by inputs to a sheet length sensor 8 and a preliminary stop command unit 10 and an inertial correction unit 9, and an output with a delay circuit 24 and an interface circuit 26 with actuators The output of the delay circuit 24 is connected to the linear displacement transducer 10 and the interface circuit 26.

The device operates as follows ..

After the start of the material supply mechanism 2 and the start of material supply to the cutting device from the linear displacement sensor 4, sequences of counting pulses arrive at the inputs of the direction determiner 12 and the linear displacement transducer 11, moreover, the signal from the sensor is shifted one relative to the other by 4 the magnitude of which is described previously, and the sign changes depending on the direction of movement. Voltage plots for forward and reverse motion are shown in Figs. 3 and 4, respectively. When the input signal at the input of the shift register 15 or 16 changes, the pulses of the generator 14 at the beginning write it to the first output and at this moment the circuits 17 ... 22 analyze this state and, depending on the direction of the material’s movement, confirm the state of the trigger 13 with a constant direction of motion or throw a trigger, if - direction. When the change is recorded in the second bit of registers 15 or 16, trigger 13 remains in its previous state.

The pulses from the linear displacement transducer 11 proportional to the length of the sheet are fed to the inertial correction unit 9. where they are summed (added or subtracted) in the counter taking into account the signal from the direction determiner 12, at the time of comparing the counter codes of the inertial correction unit 9 and the preliminary command setter 10, the comparison circuit gives a signal to issue a preliminary command to turn off the rollers, which will be transmitted to the actuator 5, but due to inertia

the roller of the material sheet will continue to move, but the difference between the setter 8 of the sheet length and the setter 19 of the preliminary command to turn off the material feeding mechanism 2 is set constant and in magnitude smaller than the inertia movement of the material. Thus, the counter of the inertial correction unit 9 after turning off the feeding mechanism 2 will continue to receive counting pulses. When comparing the code of the setter for the length of sheets 8 and the counter code of the inertial correction unit 9 in the comparison circuit 23 of the actuator control unit 6, a stop signal for the material supply 2 (the brake is applied) appears and the cutting device 3 is turned on, while the inertia of the supply 2 is and the magnitude of the length of inertia of the sheet after executing the stop command will be much less than without the preliminary command to turn off the feed, respectively, combining the sheet cutting boundary due to inertia In the next cycles, it will be more accurate, and the summation of the counting pulses in the counter of the inertial correction unit 9, taking into account the signal of the determinant of direction 12, when the material moves in the opposite direction from the specified ..-

Claims (3)

The claims . 1. A device for automatically cutting strips of rolled material, comprising an uncoiler, a material feeding mechanism, a cutting device, an actuator control unit, sheet number and sheet length sensors, respectively connected to the first and second inputs of the control unit, a linear displacement sensor including a pair of emitter -a receiver and connected via a converter to the first input of the inertial correction block of linear displacement, the output connected to the third input of the control unit, The second and third outputs of which are respectively connected to the inputs of the inverter and the inertial correction unit, characterized in that, in order to increase the accuracy of cutting the stripes along the length, it comprises a unit for determining the direction of movement and a dial of a preliminary command to stop the feed mechanism, and the inputs of the unit for determining the direction displacements are connected to the output of the linear displacement sensor, and the output is connected to the third input of the inertial correction unit, and the preliminary command adjuster is connected to the fourth input row control unit, wherein the sensor comprises a linear movement of the second pair of emitter-receiver is mounted relative to the first pair at an angle equal. /) Dr-P +, where p is the angle between the axes of the first and second pairs of the emitter-receiver; tap is the angle between two adjacent tooth beginnings of the displacement sensor; n is any integer determined only by the design of the sensor. 2, The device according to. Claim 1, with the proviso that the motion direction determination unit comprises a high frequency generator, a trigger, two channels, each of which contains a shift register, an equivalence circuit, an inverter and an And circuit, moreover, the first inputs of the shift registers are connected to the output of the high-frequency generator, and the second inputs are the inputs of the determinant, the second output of the shift register of the first channel is connected to the second input of the equivalence circuit of the second channel, and the second output of the shift register of the second channel ala - to the second input of the equivalence circuit of the first channel, the outputs of the equivalence circuits of the first and second channels are respectively connected to the second inputs of the AND circuits of the second and first channels, and the outputs are connected to the inputs of the trigger, the output of which is the output of the determinant. 3. The device according to claim 1, with the proviso that the control unit comprises a first and second matching circuit, a delay circuit and a coupling circuit connected in series, the first input of the second matching circuit is the first input control unit, the first. second and third input of the second matching circuit is respectively the second, third and fourth input of the control unit, the second input of the second matching circuit is connected to the first input of the delay circuit, with the output of the second matching circuit, and the output of the second matching circuit is connected to second in odes of the delay circuit and the pairing circuit, respectively, wherein the output of the pairing circuit is the first output of the control unit, the output of the first matching circuit is the second output of the control unit, the third output of which is the output of the delay circuit. # /. / / s / 7 Riga 2 1 / 3 2 / AND