Apparatus for producing a printing image by means of a laser
First Claim
1. An apparatus useful for producing a printing image on a printing medium held by a cylinder by a laser, the cylinder having an axis, the apparatus comprising:
- a crossmember;
a laser writing head positioned on the crossmember so as to be displaceable parallel to the axis of the cylinder;
a first protective switch configured and arranged to detect the presence of a cylinder, the first protective switch being fixedly positioned on the crossmember;
two switching strips on the crossmember which strips expose a laser writing head displacement region therebetween having a width of the printing image; and
a second protective switch attached to the laser writing head configured and arranged to switch off the laser when the laser is situated outside the laser writing head displacement region;
wherein the two switching strips and the second protective switch are mutually configured and arranged so that the second protective switch interacts with the two switching strips.
1 Assignment
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Accused Products
Abstract
In an apparatus for producing a printing image on a printing medium held by a cylinder (1) by a laser, the laser writing head (7) of which is positioned on a crossmember (3) so as to be displaceable parallel to the axis of the cylinder (1), a space-saving functionally reliable embodiment is attained by the fact that a protective switch (10) which detects the presence of a cylinder (1) is provided fixedly on the crossmember (3) and the crossmember (3) bears switching strips (5, 6) which expose a laser writing head displacement region (b) between them having the width of the printing image (8) and interact with a further protective switch (11) attached to the laser writing head (7) for switching off the laser when it is situated outside the laser writing head displacement region (b).
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Citations
8 Claims
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1. An apparatus useful for producing a printing image on a printing medium held by a cylinder by a laser, the cylinder having an axis, the apparatus comprising:
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a crossmember;
a laser writing head positioned on the crossmember so as to be displaceable parallel to the axis of the cylinder;
a first protective switch configured and arranged to detect the presence of a cylinder, the first protective switch being fixedly positioned on the crossmember;
two switching strips on the crossmember which strips expose a laser writing head displacement region therebetween having a width of the printing image; and
a second protective switch attached to the laser writing head configured and arranged to switch off the laser when the laser is situated outside the laser writing head displacement region;
wherein the two switching strips and the second protective switch are mutually configured and arranged so that the second protective switch interacts with the two switching strips. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for producing a printing image on a printing medium comprising:
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a cylinder for holding said printing medium, said cylinder having an axis;
a crossmember;
a laser comprising a laser writing head positioned on the crossmember so as to be displaceable parallel to said axis of said cylinder;
a first protective switch positioned on said crossmember for detecting the presence of said cylinder;
two switching strips on said crossmember for exposing a laser writing head displacement region therebetween having a width of the printing image; and
a second protective switch attached to said laser writing head configured and arranged to switch off said laser when said laser is situated outside said laser writing head displacement region;
wherein said second protective switch interacts with said switching strips.
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Specification