A cocoon feeder for use in the catcher of a cocoon reeling automatic machine, comprising a cacoon guiding passage disposed between a fore can and a reeling can of the automatic machine; a pipe arranged at an angle relative to said guide passage and communicated therewith by its one end portion; a cocoon pusher accommodated in said pipe so that it can reciprocate an electromagnet imparting a reciprocation motion to said cocoon pusher; said cocoon pusher made as a hermetically sealed hollow slide block made of a nonmagnetic material and accommodating the armature of said electromagnet; a coil of said electromagnet, mounted concentrically on said pipe; said pipe which is additionally communicated by its section end portion with said guide passage.
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