1. A disk recording and reproduction apparatus for performing recording andor reproduction with pickup while rotating a disk recording medium, said disk recording and reproduction apparatus comprising:
an installation means for enabling installation of either a cartridge type disk recording medium or bare disk type recording medium;
a clamping means for clamping said bare disk type recording medium; and
a drive means for moving said clamping means to a non-operating position when said cartridge type disk recording medium has been installed;
wherein said clamping means has a movable retractor an said installation means pulls said retractor out of said clamping means at a final stroke to eject said cartridge.
2. A disk recording and reproduction apparatus according to claim 1, wherein said cartridge moves said clamping means to a non-operating position by the driving force of said installation means when said cartridge type disk recording medium has been installed.
3. A disk recording and reproduction apparatus according to claim 2, wherein when said cartridge has been ejected, the resilient recovery force of an elastic member is utilized to return said clamping means to the operating position.
4. A disk recording and reproduction apparatus according to claim 8, wherein said installation means has an engaging means with a limiter function, and said retractor is pulled out from said clamping means by said engaging means.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A zero set scale for measuring linear travel of a machine table or spindle, the scale comprised of:
(a) a support member;
(b) two opposed rollers mounted on said support member;
(c) a continuous belt having a numerical scale thereon, mounted on said support rollers, said rollers spaced apart sufficient to apply slight tension to said belt, said numerical scale extending in opposite directions from a zero point;
(d) an indicator mounted in cooperation with said belt to permit said scale to be set to said zero point or required measurement; and
(e) fastener means for mounting said zero set scale to a machine.
2. The scale in accordance with claim 1 wherein said continuous belt is fabricated from a metal.
3. The scale in accordance with claim 1 wherein said continuous belt is fabricated from a steel.
4. The scale in accordance with claim 1 wherein said rollers are comprised of a rubberous material.
5. The scale in accordance with claim 1 wherein one of said rollers comprises means for rotating said belt.