Husqvarna Ab

Singer Sourcing Limited LLC

Kent Askenmalm

Patrik Jägenstedt

Stefan Grufman

Björn Mannefred

Fredrik Kallström

Stefan Stark

Jonas Holgersson

Jonas Rangsjö

Bertil Friman

Jonas Agerhall

Rolf Wahlström

Göran Calás

Göran Calås

A robotic work tool system () for defining a working area () in which a robotic work tool () is subsequently intended to operate. The robotic work tool system () comprises a robotic work tool (), at least one controller () and at least one memory (). The robotic work tool () comprises at least one sensor unit () configured to collect sensed input data while the robotic work tool () is driven around the working area () to preliminarily define a perimeter around the working area (). The at least one controller () is configured to establish a preliminary working area perimeter (). The at least one memory () is configured to store a perimeter adjustment function and instructions that cause the at least one controller () to adjust the perimeter of the working area () by applying the stored perimeter adjustment function to the established preliminary working area perimeter () and thereby produce an adjusted working area perimeter (). The perimeter adjustment function is based on the collected sensed input data corresponding to terrain features.

Robotic work tool system and method for defining a working area

A variable timing system for a sewing machine is provided comprising a shuttle hook having a hook tip, a first helical gear mounted on the shuttle hook, a lower shaft configured to rotate the shuttle hook in synchronization with a needle bar, and a second helical gear mounted on the lower shaft and capable of engaging with the first helical gear. In accordance with embodiments, at least one of the helical gears is axially movable. The variable timing system may comprise a control device configured to generate a control signal representative of a current sewing situation. A drive force mechanism may receive the control signal and in response, transmit axial movement to the axially moveable helical gear to move the gear into proper position relative to a threaded needle of the sewing machine.

Variable timing system of a sewing machine and method for selectively adjusting a timing of such a system

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Huskvarna, Sweden

Kent Askenmalm