Presses – Binding – With automatic or material-triggered control
Patent
1996-03-11
1998-05-05
Gerrity, Stephen F.
Presses
Binding
With automatic or material-triggered control
100 26, 100 31, 53589, B65B 1328, B65B 1306
Patent
active
057461201
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for tying objects with wire, for example bales of fiber material.
BACKGROUND OF THE INVENTION
Pulp bales can either be individually tied into bales, or this can be done in the form of stacked units comprising a certain number of bales, normally six or eight. Such a unit load will generally have a weight of between one and two tons. The strength of the wire connection which is used to bind together the unit load, therefore, is very important from the point of view of safety, particularly since several persons can stand close to the load when it is being lifted by means of such wires. The equipment used for twisting the knot in a tied loop, as well as the knot itself, therefore, is subject to very comprehensive safety regulations and accurate safety control.
The tying device generally comprises a unit for feeding the wire through an openable wire guide rail around the object. The feed unit is also used for tightening the wire. A twisting member is also generally utilized, which comprises a unit for locking the end of the wire, a unit for twisting a wire knot, a cutting unit, and a unit for pushing out the knot.
The wire guide rail extends about the object to be tied and guides the wire while it is being fed. The wire is then fed through the twisting member about the object to be tied. When the free end of the wire thus arrives at the twisting member for the second time, the wire is stopped and retained in the locking unit, whereafter it is tightened by reversing the feed unit. The wire guide rail is thus opened after the wire has been fed around the object, and the wire is then drawn around the object to be tied, the knot is twisted, the wire is cut and pushed out of the twisting member.
These various units are normally driven and controlled hydraulically by motors and cylinders. It has been found, however, that this drive system fails to work with the desired degree of precision during the tying process. Ample margins are, therefore, required to ensure its proper functioning, especially during the wire feeding, wire tightening and twisting steps. This also implies that the wire can be subjected to such stresses during tying, that the wire must be designed thicker than would be required for merely holding the tied objects together. The hydraulic motors, furthermore, require relatively complicated and bulky hydraulic assemblies, which creates the risk of functional disorder and high service costs.
SUMMARY OF THE INVENTION
According to the present invention, these and other objects have now been achieved by the invention of apparatus for tying objects with wire having an end which comprises feed means for feeding and tightening the wire around the object, feed drive means for driving the feed means, the feed drive means comprising a first electric servomotor, whereby the first electric servomotor can be rotated through a first predetermined number of revolutions for feeding and tightening the wire around the object, a guide rail adjustable between opened and closed conditions for guiding the wire around the object, whereby the guide rail can guide the wire around the object when in its closed condition and the wire can be tightened around the object when the guide rail is in its opened condition, locking means for locking the wire around the object after the end of the wire has been fed entirely around the object, wire twisting means for twisting the end of the wire into a knot, wire twisting drive means for driving the wire twisting means, the wire twisting drive means comprising a second electric servomotor whereby the second electric servomotor can be rotated through a second predetermined number of revolutions for twisting the end of the wire into a knot, and wire cutting means for cutting the wire after the knot has been formed.
In accordance with one embodiment of the apparatus of the present invention, the apparatus includes wire indicator means for indicating the position of the end of the wire proximate to the locking means.
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Gerrity Stephen F.
Sunds Defibrator Industries AB
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