US 4,131,803 AGranted

Apparatus for detecting defects in sheet material

AssigneesToyo Boseki Kabushiki Kaisha, Kasuga Denki, Inc.

InventorsShigeru Takematsu, Tohji Yoshida, Yukio Ikushima, Kunio Takeuchi, Arao Kakinaka, Koichi Matsunaga, Mamoru Shimakura, Yoji Komura

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Abstract

An apparatus for detecting a defect in a sheet like material, comprising: a photodetector provided opposite to a textile sheet in the vicinity of the weaving line of a weaving machine, and a prime mover for slidably driving said photodetector in the lateral direction throughout the width of the weaved textile sheet, characterized in that normally the said prime mover is adapted to convert the moving direction whenever the photodetector reaches either side edge of the weaved textile sheet but is further adapted to reverse the moving direction whenever the photodetector detects a defect in the weaved textile sheet, whereby said photodetector is caused to detect repeatedly the same defect and the weaving machine is controlled to stop the weaving operation whenever the photodetector detects the same defect more times than a predetermined number of times.

Claims8

Dependent claims

An apparatus for detecting a defect in a sheet like material, comprising;

means provided opposite to the surface of said sheet like material for detecting a defect on said sheet like material,
means for causing relative movement of said defect detecting means with respect to said sheet like material in a given direction of said sheet like material for scanning said sheet like material by said defect detecting means throughout a first relatively large distance in said given direction,
means responsive to a defect detected output from said defect detecting means for controlling said relative movement causing means for scanning said screen like material by said defect detecting means throughout a second relatively small distance in said given direction including the detected defect,
said relative movement causing means comprises guide means provided in said given direction of said sheet like material for slidably supporting said defect detecting means for movement in said given direction of said sheet like material,
means for driving said defect detecting means along said guide means,
said relative movement causing means comprises a flexible electric wire provided in said guide means for electrical connection to said defect detecting means,
wire cover means in said guide means for covering said flexible electric wire, and
said electric wire comprises a flexible spiral coil wire.

5 more elements

Dependencies are inferred from the claim text.