EP0005444B1 - Winding head - Google Patents

Description

The invention relates to a winding head, in particular for unwrapping bales in connection with a cutting device, consisting of a cylindrical wire receiving part, which has a receiving slot at its working end for gripping the wire and is arranged between two wire guide slots, and a device for axially pushing off the wound wire from the wire receiving part.

A known winding head of the type mentioned, which is known from US Pat. No. 3,513,522, consists essentially of a rod with a full profile and has an axially parallel slot running through di-i Stanqe at its working end. The rod is guided axially displaceably on a plane running above the bale to be wired parallel to the contact surface of the bale. When the wires surrounding the bale have been cut using the cutting device, the parallel ones become. severed wires combined with a receiving device downstream of the cutting device and lifted from the bale. Only then is the winding head moved in the axial direction until it reaches over the lifted, severed wires with its receiving slot. Then the winding head is rotated and winds up the wire ends until a tight wire winding is formed. Then the winding head moves back to its starting position and strips off the wound wire ends. Such a device is relatively complex, since it requires an additional device for gathering the severed wire sections and for lifting them from the bale.

The invention has for its object to provide a winding head that can take up and wind up wire ends without the aid of further devices and, in particular when used for unwrapping bales without the aid of a separate lifting device, can directly grip the wires still resting on the bale.

According to the invention, this object is achieved in that the wire receiving part is a tubular inner cylinder, that the wire receiving opening provided at the working end of the wire receiving part is formed by at least two helical slots extending from the working end of the tubular inner cylinder and penetrating the cylinder wall, that the tubular inner cylinder is at a distance is surrounded by an outer cylinder, which has at least two helical slots that also extend from its working end and run counter to the slots of the tubular inner cylinder, and that the two cylinders are rotatable relative to one another.

When using the winding head according to the invention in a bale de-wiring device, the winding head is preferably arranged in such a way that it can engage on the side of the bale opposite the cutting device. After the wire has been cut on the opposite side, either the winding head is moved against the bale or the bale is moved against the winding head in such a way that the working end of the winding head rests directly on the wire to be cut. When the two cylinders belonging to the winding head are rotated relative to one another, the wire winds up on the tubular inner cylinder so that it is pulled off the bale and a small, tight wire coil is formed, which can be easily collected and transported away. To collect the wire windings, there can be a collecting container below the winding head, in which the winding is ejected from the winding head when the cylinders rotate in opposite directions. The two cylinders of the winding head which are rotatable relative to one another are preferably arranged axially parallel to one another, so that the space between the two cylinders which forms the receiving space for the wire winding has a constant cross section over its entire length and counteracts jamming of the wire.

The outer cylinder of the winding head is preferably fixed, while the tubular inner cylinder can be rotated in both directions. In this construction, the tubular inner cylinder grips the wire in its helical slots, pulls it into the cylinder to the end of the slots, and then winds it around its outer circumference, while the slots of the outer cylinder serve to place the wire in the space between the two cylinders.

The tubular inner cylinder is preferably seated on a shaft of a motor, preferably an electric geared motor with a slow output speed. However, a hydraulic motor can also be provided, for example. The motor is preferably designed so that it is adjustable in such a way that its shaft assumes a certain position relative to the wire to be picked up when at a standstill. This has the advantage that the wire is received more securely and easily by the slots of the tubular inner cylinder. If, as is preferably the case, the tubular inner cylinder has two receiving slots, the motor is adjusted so that the input ends of the slots are just above the wire.

To ensure easier gripping of the wire by the inner cylinder, can the working end of the tubular inner cylinder protrudes a little beyond the working end of the outer cylinder.

The slots of the tubular inner cylinder expediently extend further backward from the working end than those of the outer cylinder, so that the wire can be drawn well into the space between the two cylinders and wound up securely.

The two slots provided in each cylinder can be inclined at an angle of approximately 30 to 50 ° to the cylinder axis and can be extended towards the working ends of the cylinders. The expansions of the slots are expediently formed on one side on the blunt sides that lie opposite the tips provided on the end of the cylinder. As a result, the tips that lead the wire into the slots are retained, while the flattened, flared opposite area creates a free space, so that the cylinders can be better guided to and receive the wire. The slot extensions worked out on one side preferably extend close to the front tips of the next slot.

The tubular inner cylinder is preferably arranged eccentrically to the outer cylinder, whereby a very tight, firm winding is created, the dimensions of which are determined by the narrowest point of the space between the two cylinders.

Ejecting the wire coil. normally takes place in that the tubular inner cylinder is rotated in opposite directions, so that the winding, which is supported on the inner diameter of the outer cylinder, is unscrewed from the intermediate space. However, since the end winding is intended to be used for a wide variety of wires, it can happen, for example, that the wire remains on the tubular inner cylinder in the case of wires which are easily plastically deformable or do not have sufficient rigidity. To support the ejection process, an additional ejector can therefore be arranged in the free cross section between the outer surface of the tubular inner cylinder and the inner surface of the outer cylinder. This can consist of a ring which fills the free cross section between the two cylinders and which is displaceable in the axial direction relative to the cylinders.

The winding head can be moved in the transverse direction to the wires to be accommodated and can be displaced in the axial direction, so that the relatively heavy bales do not have to be displaced during the wire removal. To find the wires, the winding head can be combined with an automatically working wire finder, which interrupts the transverse displacement as soon as it is over the wire and triggers the winding process.

• Fig. 1 eine Ansicht des Wickelkopfs in Richtung auf sein Arbeitsende, Fig. 2 einen Schnitt entlang der Linie 11-11 aus Fig. 1, Fig. 3 eine Ansicht des Vorderteils des Wickelkopfs in perspektivischer Darstellung, Fig. 4 eine Abwicklung des Innenzylinders und Fig. 5 eine Abwicklung des Außenzylinders.

The invention is illustrated in the drawing, for example, and described in detail below with reference to the drawing. Show it:

• Fig. 1 is a view of the winding head towards its end of work, Fig. 2 is a section along the line 11-11 of Fig. 1, Fig. 3 is a perspective view of the front part of the winding head, Fig. 4 is a development of the inner cylinder and Fig. 5 is a development of the outer cylinder.

According to the drawing, the winding head 1 consists essentially of a tubular inner cylinder 2, an outer cylinder 3 surrounding it at a distance and an electric gear motor 4 for driving the internal cylinder 2.

The tubular inner cylinder 2 is provided with two helical slots 6 and 7 extending from its working end 5 and recessed in the cylinder wall, which are arranged offset by 180 ° to one another.

As can be seen from the development of the tubular inner cylinder 2 shown in FIG. 4, the slots 6 and 7 are arranged inclined by approximately 30 to 40 ° to the cylinder axis and are provided with unilateral extensions 8 at the front end 5. The extensions 8 of the slots are formed on the blunt slot side, which lie opposite the tips 9 provided on the front working end 5 and extend to the tip of the following slot. At the working end 5 of the tubular inner cylinder, the slots consequently extend over a circular arc of almost 180 °, so that the front end is formed only by the two tips 9.

The part of the tubular inner cylinder 2 opposite the working end 5 is designed as a push-on sleeve 10 which engages positively over the drive shaft 11 of the motor 4. In the direction of rotation, the push-on sleeve 10 is carried along by a spring 13 seated on the drive shaft 11 and engaging in a groove 12, and in the axial direction the sleeve is held by a screw 14 screwed into the end face of the drive shaft 11, the head 15 of which is attached to an inner shoulder 16 inner bore of the tubular inner cylinder 2 is present.

The outer cylinder 3 surrounding the tubular inner cylinder 2 at a distance is arranged in a stationary manner. Via a flange 17, which is arranged on the end of the outer cylinder 3 facing away from the working end 18, the latter is fastened to a holding flange 19, which is connected to the end plate 21 of a frame 22 via a support sleeve 20 which surrounds the drive shaft 11 at a distance Motor 4 is attached, is connected. The axes of the tubular inner cylinder 2 and the outer cylinder 3 are spaced parallel to each other in a horizontal plane, so that the tubular inner cylinder 2 is arranged eccentrically to the outer cylinder 3.

The outer cylinder 3, like the tubular inner cylinder 2, is provided with two helical slots 23 and 24 extending from its working end 18, which run in opposite directions to the slots 6 and 7 of the tubular inner cylinder 2. The slots 23 and 24 are inclined approximately 40 to 45 ° to the cylinder axis and have unilateral extensions 25 at the working end, which lie opposite the tips 26 and extend to the respective tip of the following slot.

The ends 27 of the slots 23 and 24 opposite the working end 18 end in a plane which is closer to the working end than the plane which extends through the earths 28 of the slots 6 and 7 of the tubular inner cylinder 2.

The working end 5 of the tubular inner cylinder 2 protrudes a bit from the working end 18 of the outer cylinder 3, so that the tips 9 of the tubular inner cylinder 2 take the wire to be wound up first and pull it into the space 29 between the two cylinders 2 and 3. The coiled wire is ejected by rotating the tubular inner cylinder 2 in opposite directions, as a result of which the resulting wire coil is practically unscrewed from the intermediate space 29. To support the ejection, an ejector 30 is provided in the intermediate space 29. This consists of an axially displaceable ring 31, which fills the entire cross section of the intermediate space 29 between the outside of the tubular inner cylinder 2 and the inside of the outer cylinder 3 and can be shifted to the working end 5 of the tubular inner cylinder 2. The ring 31 is seated on a guide tube 32 which is axially displaceably guided in the support sleeve 20 and which can be displaced with the aid of a power actuating device, for example a pneumatic or hydraulic cylinder 33. The cylinder 33, which is attached to the end plate 21 of the frame 22, transmits a force to a transmission fork 34, which is connected via a joint 35 to the upper end of the end plate 21 and whose legs 36 and 37 engage around the support sleeve. On the guide tube 32, which carries the ejector 30, two lateral pins 39, which extend through the longitudinal slots 38 provided in the support sleeve 20, are fastened and pass through elongated holes 40 provided in the legs 36 and 37 of the transmission fork 34. By shifting the lifting rod 41 of the cylinder 33, the transmission fork 34 is pivoted about its joint 35, whereby the tube 32 provided with the ejector 30 is carried along in the axial direction.

The function of the winding head is as follows:

First, the entire winding head 1 is displaced transversely to the wire 42 of the bale 43 to be cut. With the help of a wire finder, for example an inductive proximity switch, the wire is detected and the winding head is locked as soon as the working end 5 of the tubular inner cylinder 2 is above the wire. The motor 4 is adjusted so that the opposite tips 9 of the tubular inner cylinder come to lie on both sides of the wire 42. Then the entire winding head 1 is moved against the bale 43, the tips 9 of the tubular inner cylinder 2 being pressed a little into the bale 43. Then the tubular inner cylinder 2 is rotated, the tips 9 gripping the wire 42 and pulling through the slots 6 and 7 into the space 29 between the outer cylinder 3 and the tubular inner cylinder 2. The slots 23 and 24 of the outer cylinder 3 serve to guide the wire ends entering the intermediate space 29.

When the wire piece 42 is completely wound up, the tubular cylinder 2 is rotated in the opposite direction, whereby the resulting coil is unscrewed from the winding head. Prior to this, either the winding head 1 is moved back from the bale 43 or the bale 43 is transported further, so that the wire winding can fall out of the winding head 1 into a collecting container (not shown in the drawing). The ejection process can also be supported by actuating the power cylinder 33, as a result of which the ejector presses towards the working ends and, if necessary, pushes the winding out of the intermediate space 29.

Claims (13)

1. Wind-up head, in particular for unwiring bales in conjunction with a cutting apparatus, comprising a cylindrical wire receiving portion which has at its work end a receiving slit for gripping the wire and is arranged between two wire guide slits, as well as means for axially shifting the wound-up wire off the wire receiving portion, characterized in that the wire receiving portion is a tubular internal cylinder (2), that the wire receiving opening provided at the work end (5) of the wire receiving portion is defined by at least two helical slits (6, 7) penetrating the cylinder wall and starting from the work end (5) of the tubular internal cylinder (2), that the tubular internal cylinder (2) is surrounded at a distance by an external cylinder (3) which has at least two helical slits likewise starting from its work end (18) and extending at an opposite hand to the slits of the tubular internal hollow cylinder, and that the two cylinders (2, 3) are rotatable relative to one another.

2. Wind-up head as set forth in claim 1, characterized in that the cylinders (2, 3) are arranged axially parallel to one another.

3. Wind-up head as set forth in claim 1 or 2, characterized in that the external cylinder (3) is stationary, while the tubular internal cylinder (2) is rotatable in both directions.

4. Wind-up head as set forth in claim 3, characterized in that the tubular internal cylinder (2) is drivable by a motor (4) and that the motor (4) is adjustable such that its shaft (11) during standstill assumes a predetermined position relative to the wire (42) to be received.

5. Wind-up head as set forth in one of claims 1 to 4, characterized in that the work end (5) of the tubular internal cylinder (2) projects a distance beyond the work end (18) of the external cylinder (3).

6. Wind-up head as set forth in one of claims 1 to 5, characterized in that the slits (6, 7) of the tubular internal cylinder (2) extend further rearwardly from the work end (5) than those of the external cylinder (3) do.

7. Wind-up head as set forth in one of claims 1 to 6, characterized in that each cylinder (2, 3) has two slits (6, 7; 23, 24) which are inclined at an angle of about 30 to 50° relative to the respective cylinder axis and that the slits (6, 7; 23, 24) flare toward the work ends (5, 18) of the cylinders (2, 3).

8. Wind-up head as set forth in claim 7, characterized in that the enlargements (8, 25) of the slits (6, 7 or 23, 24 resp.) are formed unilaterally at the blunt sides which oppose the points (9 or 26 resp.) provided at the facial cylinder end and extend short of the facial points of the adjacent slit.

9. Wind-up head as set forth in one of claims 1 to 8, characterized in that the tubular internal cylinder (2) is arranged eccentrically in the external cylinder (3).

10. Wind-up head as set forth in one of claims 1 to 9, characterized in that an ejector (30) is arranged in the interspace (29) between the external surface of the tubular internal cylinder (2) and the internal surface of the external cylinder (3).

11. Wind-up head as set forth in claim 10, characterized in that the ejector (30) is an annulus (31) filling the interspace (29) between the two cylinders (2, 3) said annulus being shiftable relative to the cylinders in axial direction.

12. Wind-up head as set forth in one of claims 1 to 11, characterized in that it is movable in direction transverse of the wires (42) to be received and is shiftable in axial direction and that it has an automatically operating wire detector which interrupts the transverse shifting of the wind-up head (1) as soon as it is positioned above the wire (42).

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