US 5,653,268 AGranted

Modulator mechanism for a rotary dobby in a loom

AssigneeStaubli AG

InventorMartin Burkert

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Abstract

A modulator mechanism for a rotary dobby, the input side of the modulator mechanism being connected to a drive which rotates at an essentially constant angular velocity and the output side thereof providing an output which is applied to a main shaft controlling heald shafts and which is temporally modulated inch a way that a delay of the movements of the heald shafts their maximum displacement positions is caused. To permit a sufficiently large shed rest angle for aft insertion in the case of fabrics having a very large width, a substantially enlarged shed rest angle is provided by a rotatable cam body, which is connected to the drive, and by at least one cam body follower in the form of an articulated lever, which, when the cam body rotates, carries out an oscillating pivoting movement modulated in accordance with the cam shape of the cam body, the pivoting movement being transmitted to the main shaft.

Claims12

Dependent claims

A modulator mechanism for a rotary dobby, the mechanism having an input for connection with a continuous rotary loom drive, and an output for connection with a main shaft for controlling movement of heald frames in the dobby between extreme stroke positions, so that continuous rotary movement of the loom drive is modulated to control the movement of the heald frames by the main shaft, the mechanism further comprising:

at least one rotatable curved body means drivable by the continuous rotary drive, the curved body means having a curve-shaped surface;
at least one follower means modulated by the curved body means and including a pivoted lever driven though an oscillating pivotal movement upon the follower means being modulated in accordance with the curve-shaped surface of the curve body means;
transmission means coupled to the lever for converting the pivotal movement of the lever into an oscillating rotary movement of the main shaft of the rotary dobby;
and
a crankshaft drive for connecting the main shaft of the rotary dobby and the heald frames, the oscillating pivotal movement of the pivoted lever by the curve-shaped surface of the curved body means, the transmission means, and the crankshaft drive combining to cause movement of the heald frames by the main shaft that is delayed in the extreme stroke positions of the heald frames.

2 more elements

A modulator mechanism for a rotary dobby, the mechanism having an input for connection with a continuous rotary loom drive, and an output for connection with a main shaft for controlling movement of heald frames in the dobby between extreme stroke positions, so that continuous rotary movement of the loom drive is modulated in a manner that the movement of the heald frames by the main shaft is delayed in the extreme stroke positions, the mechanism further comprising:

at least one rotatable curved body means drivable by the continuous rotary drive, the curved body means having a curve-shaped surface;
at least one follower means modulated by the curved body means and including a pivoted lever driven though an oscillating pivotal movement upon the follower means being modulated in accordance with the curve-shaped surface of the curve body means;
transmission means coupled to the lever for converting the pivotal movement of the lever into an oscillating rotary movement of the main shaft of the rotary dobby;
and
an additional rotating drive device, independent of the continuous rotary loom drive, for rotating the main shaft.

2 more elements

Dependencies are inferred from the claim text.