Fastener tape supply unit of fastener stringer continuous manufacturing apparatus

A fastener tape supply unit of a continuous manufacturing apparatus for a fastener stringer for successively attaching engaging elements for a slide fastener to a fastener tape supplied intermittently at a predetermined pitch to an engaging element implantation portion, wherein the engaging elements are obtained by cutting a metallic linear material having a substantially Y shaped section supplied intermittently at right angle and forming it into a mountain-like shape, the fastener tape supply unit comprising:

• a supply source of the fastener tape;
• a feed roller portion for feeding the fastener tape positively and continuously from the supply source;
• a dancer roller which is hung by the fastener tape fed continuously between the feed roller portion and the engaging element implantation portion and moves up and down corresponding to changes in tape tension;
• an intermittent feeding portion which is disposed in a downstream of the fastener tape of the engaging element implantation portion and feeds the fastener tape intermittently;
• detecting means for detecting a move upper limit position and a move lower limit position of the dancer roller;
• and
• a control portion for, when the detecting means detects that the dancer roller reaches the move upper limit position and the move lower limit position or when the detecting means detects that the dancer roller escapes from a range defined by the move upper limit position and the move lower limit position, controlling a tape feeding amount of the feed roller portion so as to always keep the dancer roller within the range based on a detection signal.