Electronic thread monitoring device for gripper shuttle weaving machines
AssigneeGebruder Loepfe AG
InventorsErich Loepfe, Erich Weidmann
Life of this patent
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Abstract
The invention is concerned with an electronic weft or filling thread monitoring device on a gripper shuttle weaving machine provided with means for moving the gripper shuttle, at the end of the shuttle insertion, back from a stop position to a yarn releasing position, and simultaneously tensioning the thread. The monitoring device comprises thread sensing means responsive to thread travel as well as to thread tensioning and provides machine stopping signals when neither continuous thread travel nor thread tensioning occurs in predetermined, machine-controlled monitoring intervals.
Claims6
In a gripper shuttle weaving machine provided with means for picking the gripper shuttle, means for receiving and stopping the gripper shuttle at the end of each filling thread insertion, means for returning the gripper shuttle from a stop position into a defined thread releasing position, and means for tensioning the filling thread during the returning interval of the gripper shuttle, the improvement which comprises:
- an electronic thread monitoring device comprising means arranged at the picking side of the weaving machine for sensing the filling thread and producing a first signal indicative of thread travel and a second signal indicative of thread tensioning;
- sensing means comprising at least one transducer system generating a first high frequency signal indicative of thread travel and a second low frequency signal indicative of thread tensioning during said returning interval;
- means actuated by the weaving machine for generating a first timing pulse within the filling thread insertion interval, and a second timing pulse within said returning interval;
- and
- gating means controlled by said first and second signals and first and second timing pulses, for generating a stop signal when no first or second signal exists during the first and second timing pulses, respectively.
In a gripper shuttle weaving machine provided with means for picking the gripper shuttle, means for receiving and stopping the gripper shuttle at the end of each filling thread insertion, means for returning the gripper shuttle from a stop position into a defined thread releasing position, means for tensioning the filling thread during the returning interval of the gripper shuttle, thread braking means disposed upstream of the picking means, the weft tensioning means being disposed between the thread braking means and the picking means, the improvement which comprises:
- an electronic thread monitoring device comprising
- thread sensing means located between said thread braking means and filling thread tensioning means for sensing the filling thread and producing a first signal indicative of thread travel and a second signal indicative of thread tensioning;
- means actuated by the weaving machine for generating a first timing pulse within the filling thread insertion interval, and a second timing pulse within said returning interval;
- and
- gating means controlled by said first and second signals and first and second timing pulses, for generating a stop signal when no first or second signal exists during the first and second timing pulses, respectively.
Dependencies are inferred from the claim text.