Device for detecting a moving object
First Claim
1. A device for detecting the presence of a moving object comprising:
- light source means disposed in the vicinity of a side of a transporting path of said object,light receiving means disposed at an opposite side of said light source means with respect to said transporting path,reflecting means disposed between said light source means and said light receiving means having facing and spaced apart reflecting surfaces to provide a straight-line light path connecting said light source means and said light receiving means, said object being transportable along the transporting path between the reflecting surfaces of said reflecting means, anda non-transparent member disposed in said straight-line path for preventing the light of said light source means from directly reaching said light receiving means and permitting only the light repetitively reflected between the reflecting surfaces of said reflecting means to reach said light receiving means.
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Accused Products
Abstract
A device for detecting the presence of a moving object, especially in a rotary camera, copier or printer, comprises transport rolls for the object. A pair of reflector members are disposed in opposed relationship so as to define an object transport passage therebetween. The opposed surfaces of the reflector members provide light reflecting surfaces. A light source and a non-transparent member are disposed at or adjacent one end of the reflector members for emitting light into the gap between the reflector members, and a light receiving element is disposed at or adjacent the other end of the reflector members for receiving a light beam passed thereto under repetitive reflections between the reflector members. The non-transparent member prevents the light from the light source from directly reaching the light receiving element. The light reflected between the reflector members may be intercepted by an object transported therebetween, thus detecting the presence of the moving object.
8 Citations
19 Claims
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1. A device for detecting the presence of a moving object comprising:
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light source means disposed in the vicinity of a side of a transporting path of said object, light receiving means disposed at an opposite side of said light source means with respect to said transporting path, reflecting means disposed between said light source means and said light receiving means having facing and spaced apart reflecting surfaces to provide a straight-line light path connecting said light source means and said light receiving means, said object being transportable along the transporting path between the reflecting surfaces of said reflecting means, and a non-transparent member disposed in said straight-line path for preventing the light of said light source means from directly reaching said light receiving means and permitting only the light repetitively reflected between the reflecting surfaces of said reflecting means to reach said light receiving means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for detecting the presence of a moving sheet comprising:
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means for transporting a sheet along a path, light source means disposed on one side of said transporting path of said sheet, detecting means disposed on the opposite side of said transporting path of said sheet, reflecting means having a pair of opposite and spaced apart reflecting surfaces, said light source means and said detecting means being disposed facing each other across the reflecting surfaces of said reflecting means and said sheet being transportable between said reflecting surfaces, and light interrupting means disposed between said light source means and said detecting means for interrupting the light directly headed for said detecting means from said light source means and permitting only the light repetitively reflected between the reflecting surfaces of said reflecting means to reach said light receiving means.
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18. A device for detecting the presence of a moving object comprising:
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a pair of guide members spaced apart from each other and having reflecting surfaces on facing surfaces, said guide members defining a guide path of said moving object, light source means disposed on one side of said guide path, light receiving means disposed on the opposite side of said guide path and facing said light source means across the reflecting surfaces of said pair of guide members, and interrupting means disposed in front of said light source means for interrupting the light from said light source means from directly reaching said light receiving means and permitting only the light repetitively reflected between the reflecting surfaces of said guide members to reach said light receiving means.
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19. A device for detecting the presence of a moving object comprising:
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first reflecting means at one side of a transporting path of the moving object; second reflecting means at the other side of the transporting path of the moving object; light source means disposed in the vicinity of one end of said first reflecting means; and detecting means disposed in the vicinity of the other end of said first reflecting means; said first and second reflecting means having respective reflecting surfaces which are curved in the same direction to prevent light from said light source means from directly reaching said detecting means but allowing the light which has been repeatedly reflected between said reflecting surfaces to reach said detecting means.
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Specification