To easily detach a take-up unit forming device of a yarn tension adjusting device or a yarn splicing device and easily change specifications in a structure of the take-up unit of an automatic winder.

One connection parts 3a, 4a of a connector for electric wiring and a connector for air piping are disposed at the predetermined positions of the mounting part 1a of a take-up unit support body 1. The other connection parts 3b, 4b of the connectors and a connection means 10 for mounting the connection parts on the mounting part 1a of the take-up unit support body 1 are disposed at the mounting member 2a of the take-up unit forming device 2. The arrangement of the connection parts 3a, 4a of the connectors at the mounting part 1a of the take-up unit support body 1 and the arrangement of the connection parts 3b, 4b of the connectors at the mounting member 2a of the take-up unit forming device 2 are differentiated for each type of the take-up unit forming device 2. The assembling of the take-up unit and the take-up unit forming device can be simplified, the maintenance and inspections and the change of the specifications can also be facilitated, and the take-up unit forming device is prevented from being erroneously mounted.

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