| 摘要 |
PURPOSE:To enable a recording head and a head arm to be connected or separated from each other extremely easily and securely, by detachably fitting the head to the head arm through first and second fastening member. CONSTITUTION:A heat sink 15 formed of a metal having favorable thermal conductivity has a projection 15a at a predetermined position on a back surface thereof. The projection 15a is provided with a fitting hole 15b as a first fastening member, both side surfaces of the projection 15a constitute guide surfaces 15c, and a bottom surface 15d of the projection 15a constitutes a positioning surface. A cover 23 is fixed by a small screws 24 to the back surface of a head arm 13 on which a connector 21a is provided. The cover 23 is provided with a hole 27, and a fitting member 25 is fitted in the hole 27 through a push spring 26 to constitute a second fastening member. The fitting member 25 is retracted to the side of the cover 23 against the push spring 26, and the guide surfaces 15c of the projection 15a of a recording head 14 are brought into contact with and fitted to both side surfaces 20 of a notched groove. When the positioning surface 15d of the projection 15a and a bottom surface 30 of the groove make contact with and are engaged with each other, a terminal row 20b and the connector 21a make contact with and are engaged with each other. When a knob 28 is rotated while energizing the fitting member 25 by the push spring 26, the fitting member 25 is screw-engaged with the fitting hole 15b to fix the head 14 to the head arm 13. |
