Apparatus for controlling conveyance between rollers

Patent metadata

Field	Value
Publication number	US-10029873-B2
Application number	US-201415104900-A
Country	US
Kind code	B2
Filing date	Nov 17, 2014
Priority date	Dec 17, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

An apparatus for controlling conveyance between rollers includes: a tension-control-amount-detector; a speed-shaft-speed-controller; a tension-shaft-speed-controller; a synchronous-speed-command-generation-unit synchronizing the speed-shaft speed command with a tension-shaft reference speed command; a tension-control-calculation-unit outputting a tension-control correction value based on proportional compensation based on a proportional gain, and integral compensation based on an integral gain; an adjustment-execution-command-generation-unit outputting an adjustment execution command during an automatic adjustment period; a binary-output-unit outputting one of positive and negative values of the additional-value amplitude as an additional value in adjustment during the automatic adjustment period; a tension-shaft-speed-command-generation-unit outputting a tension-shaft speed command based on the tension-shaft reference speed command, the tension-control correction value and the additional value in adjustment; and a gain-calculation-unit calculating a proportional gain and an integral gain based on a period and an amplitude of the tension control deviation for the automatic adjustment period.

First claim

The invention claimed is:

1. An apparatus for controlling conveyance between rollers that conveys a conveyed material using a speed shaft roller driven by a speed shaft motor and a tension shaft roller driven by a tension shaft motor while applying tension to the conveyed material between the speed shaft roller and the tension shaft roller, the apparatus comprising:
a tension control-amount detector to detect and output a tension control amount that is a variable that changes according to tension fluctuation of the conveyed material and is controlled so as to become a desired value;
a speed-shaft speed controller to execute control on the speed shaft motor so that a speed at which the speed shaft roller conveys the conveyed material is equal to a speed of a speed-shaft speed command;
a tension-shaft speed controller to execute control on the tension shaft motor so that a speed at which the tension shaft roller conveys the conveyed material is equal to a speed of a tension-shaft speed command;
a synchronous-speed-command generation unit to generate the speed-shaft speed command and a tension-shaft reference speed command that is to be a reference of the tension-shaft speed command in synchronization with each other in change;
a tension-control calculation unit to output a tension-control correction value based on proportional compensation obtained by multiplying a tension control deviation that is a deviation between a set tension-control command value and the tension control amount, by a proportional gain, and integral compensation obtained by integration with multiplying the tension control deviation by an integral gain;
an adjustment-execution-command generation unit to output an adjustment execution command that becomes ON during a preset automatic adjustment period, based on an instruction input from outside;
a binary output unit to output an additional value in adjustment having an amplitude whose magnitude is a preset additional-value amplitude and having a positive or negative sign determined based on the tension control deviation, during the automatic adjustment period;
a tension-shaft speed-command generation unit to receive the tension-shaft reference speed command, the tension-control correction value and the additional value in adjustment, and output the tension-shaft speed command based on addition or selection thereof; and
a gain calculation unit to calculate the proportional gain and the integral gain based on a measurement result of an oscillation period and an amplitude of the tension control deviation, during the automatic adjustment period,
wherein the adjustment-execution-command generation unit outputs an adjustment execution command being ON, when both or either one of the speed-shaft speed command and the tension-shaft reference speed command of the synchronous-speed-command generation unit is zero, and
the binary output unit changes the additional-value amplitude with passage of time and sets the additional-value amplitude so that the additional-value amplitude in a period from a time point when an output of the adjustment-execution-command generation unit becomes ON until a time point when a sign of the tension control deviation first changes is smaller than an additional-value amplitude after the time point when the sign of the tension control deviation first changes.

2. The apparatus for controlling conveyance between rollers according to claim 1 , further comprising an output-amplitude setting unit to receive a tension-amplitude set value from outside, wherein
the binary output unit includes:
an output-amplitude measurement unit to calculate and output a tension deviation amplitude that is an amplitude of the tension control deviation;
an output-amplitude comparison unit to compare magnitudes of the tension deviation amplitude and the tension-amplitude set value with each other;
an amplitude determination unit to update and output the additional-value amplitude so as to increase from an initial value while the tension deviation amplitude is smaller than the tension-amplitude set value, based on an output of the output-amplitude comparison unit; and
a binary-output determination unit to output a value obtained by selecting one of two values being a positive value and a negative value having a magnitude of the additional-value amplitude, based on the tension control deviation, as the additional value in adjustment.

3. An apparatus for controlling conveyance between rollers that conveys a conveyed material using a speed shaft roller driven by a speed shaft motor and a tension shaft roller driven by a tension shaft motor while applying tension to the conveyed material between the speed shaft roller and the tension shaft roller, the apparatus comprising:
a tension control-amount detector to detect and output a tension control amount that is a variable that changes according to tension fluctuation of the conveyed material and is controlled so as to become a desired value;
a speed-shaft speed controller to execute control on the speed shaft motor so that a speed at which the speed shaft roller conveys the conveyed material is equal to a speed of a speed-shaft speed command;
a tension-shaft speed controller to execute control on the tension shaft motor so that a speed at which the tension shaft roller conveys the conveyed material is equal to a speed of a tension-shaft speed command;
a synchronous-speed-command generation unit to generate the speed-shaft speed command and a tension-shaft reference speed command that is to be a reference of the tension-shaft speed command in synchronization with each other in change;
a tension-control calculation unit to output a tension-control correction value based on proportional compensation obtained by multiplying a tension control deviation that is a deviation between a set tension-control command value and the tension control amount, by a proportional gain, and integral compensation obtained by integration with multiplying the tension control deviation by an integral gain;
an adjustment-execution-command generation unit to output an adjustment execution command that becomes ON during a preset automatic adjustment period, based on an instruction input from outside;
a binary output unit to output an additional value in adjustment having an amplitude whose magnitude is a preset additional-value amplitude and having a positive or negative sign determined based on the tension control deviation, during the automatic adjustment period;
a tension-shaft speed-command generation unit to receive the tension-shaft reference speed command, the tension-control correction value and the additional value in adjustment, and output the tension-shaft speed command based on addition or selection thereof;
a gain calculation unit to calculate the proportional gain and the integral gain based on a measurement result of an oscillation period and an amplitude of the tension control deviation, during the automatic adjustment period; and
an additional-value-amplitude setting unit to receive the additional-value amplitude from outside, wherein
the synchronous-speed-command generation unit outputs the speed-shaft speed command and the tension-shaft reference speed command as zero, at a time of initial startup and in an OFF period until the adjustment execution command is changed to ON, and immediately after the adjustment execution command is changed from ON to OFF, and outputs the tension-shaft reference speed command and the speed-shaft speed command having a magnitude equal to or larger than the additional-value amplitude during the automatic adjustment period.

Assignees

• Mitsubishi Electric Corp

Inventors

• Ikeda Hidetoshi
• Kimura Masaya
• Saito Akio
• Marushita Yoshihiro

Classifications

• B65H23/1806

  in reel-to-reel type web winding and unwinding mechanism, e.g. mechanism acting on web-roll spindle · CPC title

• B65H2220/02

  indicating an entity which is controlled, adjusted or changed by a control process, i.e. output · CPC title

• B65H18/145 Primary

  Reel-to-reel type web winding and unwinding mechanisms · CPC title

• B65H2557/264

  with key characteristics based on closed loop control · CPC title

• B65H2220/01

  indicating an entity as a function of which control, adjustment or change is performed, i.e. input · CPC title