Binding-twine controlling device for a round-baling press.

摘要

1. A binding control apparatus for cylindrical bale presses of the type comprising a twine guide member (7) which is displaceable transversely with respect to the press with a reciprocating movement during the binding operation, in particular in front of the intake orifice for the crop products, and an electrical means (11) for displacing said member, said electrical means being supplied with power from an electrical current source by a first circuit (A) for actuating said electrical means for displacing the twine guide member in one direction and by a second circuit (B) for actuating said displacing means in the other direction in order to be able to produce the desired reciprocating movement of said twine guide member, characterised in that it comprises first and second relays (18, 36), the contact elements of which are respectively provided in said first and second circuits (A, B), electrical circuits which can be supplied with power from the electrical current source for selective energisation of said relays, a main control switch (14) of momentary closure type, a first contact-making means (16) which is normally closed when the twine guide member (7) is at a first end of its travel, said main switch and said first contact-making means being disposed in the energisation circuit of the first relay (18) so as to close said first relay and to provide for the supply of power to the means (11) for displacing said member in the first direction when said main switch (14) is closed, by way of said first relay (18), to initiate binding of the bale, means for opening said first contact-making means (16) when the twine guide member (7) reaches the other end of its travel, a second contact-making means (27) which is closed when said twine guide member reaches said other end of its travel, a third relay (31) which is energised upon closure of said second contact-making means (27) and the contact element of which is disposed in the energisation circuit of said second relay (36), so as to close said second relay upon closure of said second contact-making means and permit the supply of power to the second circuit (B), thus causing displacement of the twine guide member in the other direction under the action of the electrical displacing means, means for opening the energisation circuit of said third relay (31) when the twine guide member has returned to the first end of its travel, and means for self-holding of the first and third relays (18, 31) in the closed position during the binding operation and displacement of the twine guide member.