PROBLEM TO BE SOLVED: To extend an adjustment range of a feed-out amount of a feed-out mechanism while avoiding the use of a large feed-out amount adjustment mechanism.SOLUTION: A feed-out transmission mechanism 30 transmitting power to a feed-out drive shaft 29 extended across plural feed-out mechanisms includes: a first conversion part 49 converting rotation power to reciprocating oscillation motion； and a second conversion part 50 converting the reciprocating oscillation motion to normal rotation motion of the feed-out drive shaft 29. The second conversion part 50 is provided on right/left one end part of a machine body together with a feed-out amount adjustment mechanism 31 adjusting a feed-out amount of the respective feed-out mechanisms collectively. The second conversion part 50 includes: a first link mechanism 58 transmitting forward direction oscillation motion from the first conversion part 49 to the feed-out drive shaft 29； and a second link mechanism 59 transmitting backward oscillation motion from the first conversion part 49 to the feed-out drive shaft 29. The second link mechanism 59 provided on a lateral outer side of the machine body includes a switch part 64 switching the second link mechanism 59 between a link state and a link cancellation state. A cover 77, which covers the feed-out amount adjustment mechanism 31 and the second conversion part 50 while causing the switch part 64 to be opened laterally outward.【課題】繰出量調節機構の大型化を招かずに繰出機構の繰り出し量調節範囲を広くする。【解決手段】複数の繰出機構にわたる繰出駆動軸２９に伝動する繰出用伝動機構３０に、回転動力を往復揺動運動に変換する第１変換部４９と、往復揺動運動を繰出駆動軸２９の正回転運動に変換する第２変換部５０とを備え、第２変換部５０を、各繰出機構の繰り出し量を一括して調節する繰出量調節機構３１とともに機体の左右一側端部に配備し、第２変換部５０に、第１変換部４９からの往方向の揺動運動を繰出駆動軸２９に伝える第１リンク機構５８と、第１変換部４９からの復方向の揺動運動を繰出駆動軸２９に伝える第２リンク機構５９とを備え、機体横外側に配備する第２リンク機構５９に、第２リンク機構５９を連係状態と連係解除状態とに切り替える切替部６４を備え、切替部６４を横外方に開放する状態で繰出量調節機構３１と第２変換部５０とを覆うカバー７７を備える。【選択図】図９
