DD282837A5 - BINDING DEVICE FOR BALE PRESSES - Google Patents

Abstract

The inventive binding device for balers relates to agricultural machinery. In the thread guide of the binding device, a switchable designed thread brake and a downstream elastic, preferably spring-loaded clamping device is arranged. The tensioning device is associated with the thread for applying a defined thread tension on the braked Fadenstueck between the switched-thread brake and the thread holder of the Knüppapparates. The braking and tensioning device is switched on and off depending on the rotation angle of the Knuepferwelle and the position of the binding needle so dasz the braking device during the bale forming and the upward movement of the binding needle off and then until the termination of the binding of the node at the beginning of the formation of the new Ballens is switched on. Fig. 1 {baler; Binding apparatus; Two string ties; Bobbin thread; Brake and tensioning device; switching capability; Yarn tension; Thread holder}

Description

For this 3 pages drawings

Field of application of the invention

The invention relates to a binding device for balers, especially for large balers.

Zie ^{1 of} the invention

The invention has the object to provide a binding device in which the burden of the knotter when binding the node to the end of the bale forming and that of the binding needle drive over the prior art significantly reduced.

Characteristic of the known state of the art

In balers with large baling chamber sections which produce very dense bales, it is preferable to use the two-knot binding in which the threads are drawn from two separate rolls and knotted together at the beginning and end of baling.

For secure binding and removal of the nodes from the node hook while a certain minimum thread tension is required. This yarn tension is currently applied with approximately constant-acting braking devices (see also GB- ^p S 2141664) and spring-loaded clamping lever preferably on the lower thread.

These devices all have the disadvantage that the yarn brake au ^f must be set to a precisely prescribed braking force. This must be so large that is stretched by the withdrawn via the binding needle thread of the spring-loaded thread tensioner, which in turn applies the necessary for tying the node at the beginning of bale forming thread tension on the knotter. This setting places high demands on the operator as well as on the quality and uniformity of the binding thread used. In addition, by the applied thread tension of the knotter when tying the node to the end of the bale forming, if already a sufficient thread tension is already present, additionally burdened, resulting in unnecessary drive torque peaks and increased wear. Due to the high yarn tension and the binding needle when crossing the press channel is very heavily loaded, which in turn requires very stiff and thus heavy binding needles. These heavy Bir.densdeln and the high thread tension, which enters with the Bindenadelradius in the drive torque, also require a large power requirement dea Bindonadelantriebes.

Explanation of the essence of the invention

The invention has for its object to provide a binding device in which the thread tension when binding deö node reduced to the end of Ballenformuny and is provided at binding of the node at the beginning of the formation of the new bale in sufficient height. In addition, the setting of the brake should be easy to implement. According to the invention this is achieved, in the lower thread a switchable braking device and between the braking device and the binding needle tip a spring-loaded Spanneinrichtu; ; are assigned, in the Ru> - situation with dissolved braking device, the clamping device is applied to a stop below! protrudes into the pivot circle of Bindenao carrier. The control of the braking device via a cam mechanism and a linkage of the t'nüpfe · .relle. The braking device consists of two offset elements, one of which is loaded by a! Ider and rests against a stop and the other is connected to the linkage.

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During bale forming, the thread brake allows the thread to pass through almost unhindered. The tensioning device remains in its initial position. The state of the yarn brake is also maintained, while the binding needle passes through the pressing channel. The thread is thus placed around the bale with a low tension, and the knot at the end of bale formation is tied with a low thread tension . During the upward movement of the binding needle Blndenadelträgcr detects the projecting into his Schwlenl.kreis thread tensioning device and takes it up with. The spring of the clamping device is biased. After the binding needle has reached its highest position, the yarn brake is activated via a driven by the knotter shaft cam mechanism and a linkage. In this case, a connected to the linkage element is moved against a staggered opposite spring-loaded element and thereby clamped the thread between the two elements.

di; Braking force must assume a certain minimum value, which is above the force of the clamping device. The upper value can vary widely, but must be less than the holding force of the yarn holder of the knotter. During the Bindenadelrückhubes the tensioning device is released from Bindenadelträger and brings on the thread piece between the braking device and the thread holder of the knotting a defined thread tension, which is needed for secure binding of the node at the beginning of the formation of the new bale. Once this binding process is completed, the thread brake is released again, thus ensuring a nearly unhindered withdrawal of the thread from the roll. The thread tension required to securely tie the knot at the beginning of the formation of the new bale is achieved by adjusting the spring force of the tensioner.

Ausführungsbn! Game

Reference to an exemplary embodiment, the invention will be explained in more detail below. Show

Fig. 1: rest position of the brake and tensioning device

Fig. 2: Position of the brake and tensioning device during the upward movement of the binding needle

Fig.3: Position of the brake and tensioning device during the binding of the second node

Fig.4: Brake device in dissolved state

Fig. 5: braking device in switched-on state.

At the press channel 1 a baler a Bindenadelträger 2 is pivotally mounted with binding needle 3 in a known manner. Below the Preßkanales 1 are the thread brake 5, a guide roller 6 and a clamping machine 7, which is loaded by the spring 9 and rests in its initial position on the stop 8. With the Knüpferwello a control cam 10 is rotatably connected, which actuates a lever 11. This is connected by means of a linkage 12 with the yarn brake 5. In the initial position (FIG. 1), the needle rocker 2 is in its rear position. The thread 4 runs from the thread roll via thread guide elements, not shown, through the thread brake 5, via the guide roller 6, the Ansch'ag 8 adjacent, loaded by the spring 9 tension lever 7 and the tip of the binding needle 3 in the compression channel 1. The lever 11 is located on the control cam 10 in its lower position. The yarn brake 5 is released and ensures an unimpeded withdrawal of the thread 4. In the upward movement of the binding needle 3 shown in FIG. 2, the binding needle carrier 2 ergreih the tensioning lever 7 and also pivots it upwards. This is released by this thread, which in conjunction with the dissolved yarn brake 5, the unloaded pivoting up the binding needle 3 and thus a relatively loose laying around the thread 4 to the bale located in the compression channel 1 ensures, which in turn a lower load on the knotter when tying of the knot to the end of the bale forming means.

When the binding needle 3 has reached its upper position, the lever 11 is brought by the control cam 10 in its upper position. About the rod 12 dabe ¹ the yarn brake 5 is tensioned, whereby a strong braking of the yarn 4 is achieved. During the downward movement of the binding needle 3 (FIG. 3), the binding needle carrier 2 releases the tension lever 7 again and this is tensioned by the spring 9 in the direction of the stop 8. Constructively, the position of the stop 8 is to be determined so that the thread loop lying around the tensioning lever 7 is taut before the tensioning lever 7 abuts against the stop 8 and thus by the spring 9 a defined thread tension is applied, the secure binding of the node at the beginning of Forming the new bale ensures ~. After completion of the binding of this node, the control cam 10 releases the lever 11, which pivots back into its lower position and thus on the linkage 12, the yarn brake 5 triggers. This releases the thread 4 and the tensioning lever 7 is pulled by the spring 9 against the stop 8, whereby again the starting position is established. 4 and 5, the execution of the yarn brake is shown. 4 shows the disconnected thread brake. The opposing elements 13, 14 offset by the distance s are displaceably mounted in the holes 15, 16. The element 13 is pressed by a spring 17 against a stop 18. The element 14 is held by an actuator 12 so that the thread 4 can be pulled almost freely between the Elerr.onten 14,15. In the switched-on state of the brake (FIG. 5), the thread 4 is clamped in the narrow gap between the element 14 displaced by the actuating element 12 in relation to the element 7 which deflects against the spring force. The braking force is determined by the gap width, the thread 4 to be clamped and by the force of the spring 17.

Claims (3)

1. binding device for balers, in which the threads are withdrawn from two separate roles and knotted each other at the beginning and end of the bale forming, the needle drive shaft and the knotter shaft performs two revolutions, characterized in that the lower thread (4) has a switchable Brake device (5) and between the brake device (5) and the binding needle tip are associated with a spring-loaded clamping device (7), wherein in the rest position with dissolved braking device (5), the clamping device (7) against a stop (8) and in the pivoting circle of Bindenadelträgers protruding. 2. Binding device according to claim 1, characterized in that for driving the braking device (5), a cam mechanism (10,11), a linkage (12) and a knotter shaft are connected. 3. Binding device according to claim 1, characterized in that the braking device (5) consists of two mutually offset elements (13,14), of which the one element (13) is loaded by a spring (17) and abuts a stop (15) and the other element (14) is connected to the linkage (12).