Pulling mechanism for controlling the heald frames of a loom and loom comprising such a mechanism

A pulling mechanism for controlling the heald frames of a loom equipped with a shedding machine, the pulling mechanism comprising, for each heald frame:

• a set of connecting rods,
• oscillating levers, coupled to the rod assembly and configured to return a movement of an exit arm or crank of the shedding machine to the heald frame so as to drive this heald frame in a alternating motion along a frame axis between an up and a down position,
• wherein the oscillating levers are associated with the heald frame and comprise a first oscillating lever and a second oscillating lever, of which:
• the first oscillating lever is pivotally mounted in relation to the loom about a first pivot axis, orthogonal to a frame plane,
• the second oscillating lever is pivotally mounted in relation to the loom about a second pivot axis, parallel to the first pivot axis,
• wherein the rod assembly comprises:
• a primary connecting rod, configured to be connected to the exit arm or crank about a first joint, which makes a pivotal connection about an rotational axis parallel to the first pivot axis,
• a first actuating rod, configured to be connected to a first end of the heald frame and intended to drive the heald frame in movement along the frame axis,
• a second actuating rod, configured to be connected to a second end of the heald frame and intended to drive the heald frame in movement along the frame axis,
• at least one connecting rod, which connects the first oscillating lever to the second oscillating lever and is intended to drive the second oscillating lever,
• wherein the first oscillating lever:
• is connected to the primary connecting rod about a second joint that makes a pivot connection about an rotational axis parallel to the first pivot axis,
• is intended to drive the first actuating rod via a third joint and to drive the connecting rod via a fourth joint, the third joint and the fourth joint each making a pivotal connection about a respective rotational axis parallel to the first pivotal axis,
• wherein the second oscillating lever:
• is articulated to the connecting rod about a fifth joint,
• is intended to drive the second actuating rod via a sixth joint, the fifth joint and the sixth joint each making a pivotal connection about a respective rotational axis parallel to the first pivotal axis,
• wherein the pulling mechanism comprises at least one measuring portion, equipped with a target, the target being configured to interact with a sensor,
• wherein each measuring portion is provided on a peripheral wall of one of the elements selected from:
• the first oscillating lever,
• the second oscillating lever,
• a third oscillating lever or a stabilizer of the pulling mechanism, the third oscillating lever or the stabilizer each being mounted so as to pivot in relation to the loom about a third pivot axis parallel to the first pivot axis and being articulated to the connecting rod,
• and wherein the target is reversibly mounted on the measuring portion.