US 5,884,546 A · Punch unit

Abstract

A punch unit includes a punch driver having a punch connected to it. A guide bushing receives the punch for guiding its axial displacement. A compression spring urges the punch driver rearwardly, away from the guide bushing. An intermediate member located between the guide bushing and the compression spring includes a collar, a holding member positioned concentrically inside the collar and releasable retaining means. The collar is rotatable relative to the holding member such that rotation in a first direction moves the retaining means into a locked position in which the guide bushing is prevented from moving longitudinally out of said holding member and rotation of the collar in a second direction opposite to the first direction moves the retaining means into an unlocked position in which the guide bushing is removable from the holding member. An indexing pin, also located in the intermediate member, releasably engages selected detent seats in the guide bushing to establish the rotational position of the guide bushing and hence also the punch length.

Claims20

Dependent claims

A punch unit comprising:

a punch driver having front and back ends;
a punch head positioned on said back end of the punch driver;
a punch having a back end connected to said front end of said punch driver;
a guide bushing receiving said punch for guiding axial displacement of said punch;
means for preventing rotation of said punch relative to said guide bushing during punching;
a compression means for urging the punch driver rearwardly away from said guide bushing;
and
an intermediate member between the guide bushing and the compression means, said intermediate member comprising a collar and a holding member positioned inside said collar, said holding member including releasable retaining means for releasably retaining the guide bushing, said collar being rotatable relative to said holding member such that rotation in a first direction moves said retaining means into a locked position wherein said guide bushing is prevented from moving out of said holding member and rotation of said collar in a second direction opposite to said first direction moves said retaining means into an unlocked position wherein said guide bushing is removable from said holding member.

5 more elements

A punch unit comprising:

a punch driver having front and back ends;
a punch head positioned on said back end of the punch driver;
a punch having a back end connected to said front end of said punch driver;
a guide bushing receiving said punch for guiding axial displacement of said punch;
means for preventing rotation of said punch relative to said guide bushing during punching;
a compression means urging the punch driver rearwardly away from said guide bushing;
an intermediate member positioned between the guide bushing and the compression means, said intermediate member including releasable retaining means movable between a locked position wherein said guide bushing is prevented from moving out of said intermediate member and an unlocked position wherein said guide bushing is removable from said intermediate member, said releasable retaining means allowing relative rotation of said guide bushing with respect to said intermediate member in the locked position;
and
indexing means for controlling relative rotation of said guide bushing with respect to said intermediate member, said indexing means being movable between a secured position in which rotation between said guide bushing and said intermediate member is prevented and a released position wherein said guide bushing and said intermediate member are rotatable relative to one another.

6 more elements

Dependencies are inferred from the claim text.

Punch unit

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Punch unit

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Abstract

Claims20