US 12,318,966 B2
Powdery-material feeding device
Shinsuke Fushimi, Kyoto (JP); Hideyuki Nishimura, Kyoto (JP); and Yuuya Kawai, Kyoto (JP)
Assigned to KIKUSUI SEISAKUSHO LTD., Kyoto (JP)
Filed by KIKUSUI SEISAKUSHO LTD., Kyoto (JP)
Filed on Dec. 22, 2022, as Appl. No. 18/087,048.
Claims priority of application No. 2022-001843 (JP), filed on Jan. 7, 2022.
Prior Publication US 2023/0219263 A1, Jul. 13, 2023
Int. Cl. B29C 31/06 (2006.01); B29C 43/34 (2006.01); B29C 43/58 (2006.01); B30B 11/00 (2006.01); B30B 11/08 (2006.01); B30B 15/26 (2006.01); B30B 15/30 (2006.01); G05D 7/06 (2006.01)
CPC B29C 31/06 (2013.01) [B29C 43/34 (2013.01); B29C 43/58 (2013.01); B30B 11/005 (2013.01); B30B 11/08 (2013.01); B30B 15/26 (2013.01); B30B 15/302 (2013.01); G05D 7/0605 (2013.01); B29C 2043/5875 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A powdery-material feeding device, co p sing:
a transfer member configured to deliver a powdery material to be discharged;
a motor configured to drive the transfer member; and
a controller configured to control the motor,
wherein
the controller selectively conducts
constantly keeping-control of constantly keeping rotational speed of the motor, current or voltage applied to the motor without any change as a manipulated variable for a predetermined period even upon an increase or a decrease in discharge flow rate of the powdery material, or
feedback-control of repetitively obtaining a difference between the discharge flow rate of the powdery material and a target value of the discharge flow rate of the powdery material at predetermined cycles and adjusting, by increasing or decreasing, the manipulated variable at each of the predetermined cycles in order to reduce the difference,
the controller conducts the constantly keeping-control immediately after the motor starts,
the controller shifts to the feedback-control when the difference between the discharge flow rate of the powdery material and the target value of the discharge flow rate of the powdery material has an absolute value less than a threshold after the period for the constantly keeping-control elapses, and
the controller conducts constantly keeping-control again without shifting to the feedback-control when the absolute value of the difference between the discharge flow rate of the powdery material and the target value of the discharge flow rate of the powdery material is more than the threshold after the period for the constantly keeping-control elapses, and the manipulated variable during the repeated constantly keeping-control is changed in accordance with the difference between the discharge flow rate of the powdery material and the target value of the discharge flow rate of the powdery material after elapse of the period for latest constantly keeping-control.