US 5,181,801 AGranted

Device for actuating a tilting lever used in sensing sheet-type recording media

AssigneeMannesmann Aktiengesellschaft

InventorEgon Durler

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Abstract

A device for actuating a tilting lever used in sensing sheet-type recording media includes a tilting lever having first and second arms and being swingably mounted about a pivot axis attached to a frame, from a first reference position to a second reference position. A first permanent magnet cooperates with a magnetized contact region on the first tilting-lever arm and is arranged to rest against the magnetized contact region when the first arm is in the first reference position. A second permanent magnet cooperates with a further magnetized contact region on the second arm and is arranged to rest against the further contact region when the second arm is in the second reference position. The respective distances from the first and second permanent magnets to the pivot axis is selected such that unequal torques of sufficiently large magnitude exist between the permanent magnets and their associated arms such that the tilting lever can be displaced from at least one of the reference positions by a slight driving force and abruptly shifted to the other reference position.

Claims10

Dependent claims

A device for actuating a tilting lever used in sensing a sheet-type recording medium, comprising:

a frame;
a tilting lever having first and second arms extending in a longitudinal direction of said tilting lever and a pivot axis attached to said frame, said tilting lever being swingably mounted about said pivot axis between a first reference position and a second reference position;
means directing the sheet-type recording medium in a path which intersects said tilting lever in one of its first or second positions;
a first permanent magnet having a magnetic force cooperating with a first magnetized contact region on said first tilting-lever arm and arranged to rest against said magnetized contact region when said first tilting-lever arm is in said first reference position;
and
a second permanent magnet having a magnetic force cooperating with a second magnetized contact region on said second tilting-lever arm and arranged to rest against said second contact region when said second tilting-lever arm is in said second reference position,
wherein the respective distances from said first and second permanent magnets to said pivot axis in longitudinal direction of said tilting lever are selected such that unequal torques of sufficiently large magnitude exist between said first and second permanent magnets and said first and second tilting-lever arms, respectively, such that said tilting lever can be displaced from at least one of said first and second reference positions in responce to a driving force exerted by the sheet-type recording medium on said tilting lever and then shifted to said other reference position.

4 more elements

A device for actuating a tilting lever used in sensing a sheet-type recording medium, comprising:

a print head carriage of a printer, comprising a path for feeding the recording medium and having a sensor;
a tilting lever having first and second arms and a pivot arms, said tilting lever being mounted on said print head carriage and swingably attached to a plane parallel to a central plane of motion of said print head carriage and having one of said tilting-lever arms extending into said path of said recording medium, having a first reference position and a second reference position;
a first permanent magnet having a magnetic force cooperating with a first magnetized contact region on said first tilting-lever arm and arranged to rest against said magnetized contact region when said first tilting-lever arm is in said first reference position;
and
a second permanent magnet having a magnetic force cooperating with a second magnetized contact region on said second tilting-lever arm and arranged to rest against said second contact region when said second tilting-lever arm is in said second reference position,
wherein the respective distances from said first and second permanent magnets to said pivot axis is selected such that unequal torques of sufficiently large magnitude exist between said first and second permanent magnets and said first and second tilting-lever arms, respectively, such that said tilting lever can be displaced from at least one of said first and second reference positions by a driving force exerted by said recording medium on said tilting lever and then shifted to said other reference position and said sensor produces an output indicative of said tilting lever being in said first reference position or said second reference position.

3 more elements

Dependencies are inferred from the claim text.