糸枠 is read as いとわく (itowaku) and means reel.
いとわく
itowaku
いといがわしずおかこうぞうせん
Itoigawa-Shizuoka Tectonic Line
しか
price of silk thread
いとへんけいき
textile boom
いとをはる
to stretch a string
いとくりぐるま
spinning wheel
わく
time slot (in a broadcasting schedule)
かたわく
mold
きこくしじょわく
(school) admission category for students who have lived abroad
にゅうがくわく
school admission category
ていいんわく
quota (for applicants, personnel, etc.)
さんかわく
limit on participation
はっちゃくわく
airport slot