US 5,054,304 AGranted

Sheet stock feed line with deceleration and acceleration

AssigneeNusco Kabushiki Kaisha

InventorsShigeki Hayashi, Shigeru Kusaka

Life of this patent

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Abstract

A sheet stock feed line in which sheet stock is leveled and fed by a leveler to a feeder and each time the feeder feeds the sheet stock by a predetermined length, the feed by the feeder is stopped for working the sheet stock. While the feed by the feeder is stopped, the leveler feeds the sheet stock at a very low feed rate to form a loop of the sheet stock between the leveler and the feeder. When the loops reaches a predetermined size, the feeder resumes the feed of the sheet stock and the leveler is controlled so that its feed amount follows that by the feeder.

Claims8

Dependent claims

A sheet stock feed line comprising:

first feed means for feeding sheet stock;
first drive control means for controlling the operation of said first feed means;
second feed means for receiving sheet stock fed by said first fed means and for feeding said sheet stock to a tool for working;
second drive control means for controlling said second feed means and operative to decelerate said second feed means to a halt each time the length of said sheet stock fed by said second feed means reaches a preset length so that said sheet stock can be worked by said tool during said halt, said second drive control means being operative thereafter to accelerate said second feed means to resume the feeding of said sheet stock by said second feed means;
said first drive control means including loop amount measuring means for measuring, as a loop amount, the difference between the amounts of sheet stock fed by said first and second feed means;
first velocity reference generating means which generates, based on the feed rate by said second feed means, a first velocity reference signal for controlling said first feed means so that while said second feed means feed said sheet stock, said loop amount of said sheet stock is reduced to substantially zero and the feed rate by said first feed means follows the feed rate by said second feed means;
second velocity reference generating means for generating a second velocity reference signal based on a predetermined creep velocity;
and changeover means for selectively applying said first and second velocity reference generating means to said first feed means;
said first drive control means being operative, even while said second feed means is halted, to continue the feeding of said sheet stock by said first feed means at said creep velocity corresponding to said second velocity reference signal so as to cause a loop in said sheet stock to sag down between said first and second feed means, and said first drive control means being operative, after working of said sheet stock by said tool, to accelerate the feeding of said sheet stock by said first feed means in accordance with said first velocity reference signal so as to cause the amount of sheet stock fed by said second feed means to follow the amount of sheet stock fed by said second feed means in synchronization with the resumption of its feed, thereby minimizing the sag in said loop of sheet stock.

6 more elements

Dependencies are inferred from the claim text.

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Abstract

A sheet stock feed line comprising:

first feed means for feeding sheet stock;
first drive control means for controlling the operation of said first feed means;
second feed means for receiving sheet stock fed by said first fed means and for feeding said sheet stock to a tool for working;
second drive control means for controlling said second feed means and operative to decelerate said second feed means to a halt each time the length of said sheet stock fed by said second feed means reaches a preset length so that said sheet stock can be worked by said tool during said halt, said second drive control means being operative thereafter to accelerate said second feed means to resume the feeding of said sheet stock by said second feed means;
said first drive control means including loop amount measuring means for measuring, as a loop amount, the difference between the amounts of sheet stock fed by said first and second feed means;
first velocity reference generating means which generates, based on the feed rate by said second feed means, a first velocity reference signal for controlling said first feed means so that while said second feed means feed said sheet stock, said loop amount of said sheet stock is reduced to substantially zero and the feed rate by said first feed means follows the feed rate by said second feed means;
second velocity reference generating means for generating a second velocity reference signal based on a predetermined creep velocity;
and changeover means for selectively applying said first and second velocity reference generating means to said first feed means;
said first drive control means being operative, even while said second feed means is halted, to continue the feeding of said sheet stock by said first feed means at said creep velocity corresponding to said second velocity reference signal so as to cause a loop in said sheet stock to sag down between said first and second feed means, and said first drive control means being operative, after working of said sheet stock by said tool, to accelerate the feeding of said sheet stock by said first feed means in accordance with said first velocity reference signal so as to cause the amount of sheet stock fed by said second feed means to follow the amount of sheet stock fed by said second feed means in synchronization with the resumption of its feed, thereby minimizing the sag in said loop of sheet stock.

6 more elements