Title:
緯糸測長ドラム上の緯糸検出装置
Document Type and Number:
Japanese Patent JP4101351
Kind Code:
B2
Abstract:
A feeler for monitoring a thread reserve in weft feeders, comprising a light-emitting device constituted by a light source (21) which directs light rays (R) onto a thread (F) wound in spaced turns on the drum (11) of the feeder (10), and a receiver means (27-28-40), which collects the light rays and converts them into electrical signals that indicate the presence or absence of turns of thread. A first focused optical transmission system forms a first pointlike luminous image (A) of the light source (21) on the turn being monitored and, in the absence of the turn, a second pointlike luminous image (B) of the light source located on a screen surface (23) which is arranged below the turns. A second focused optical projection system (26) selectively projects the first or second luminous image (A-B), along respective differentiated optical paths (CO1-CO2), onto at least one optical sensor (27-28-40) which emits discriminated signals that correspond to the length of the corresponding optical paths.
Inventors:
Pietro Zenoni
Application Number:
JP10646598A
Publication Date:
June 18, 2008
Filing Date:
April 16, 1998
Export Citation:
Assignee:
LGL Electronics SP
International Classes:
D03D47/36; B65H51/22; G01N21/89; B65H63/00; G01N21/892
Domestic Patent References:
| JP61245342A | ||||
| JP2134191A | ||||
| JP2106182U |
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Yasuhiko Murayama
Shinya Mitsuhiro
Takashi Watanabe
Yasuhiko Murayama
Shinya Mitsuhiro