NL8601609A - Pivoting cutter for loading cart straw feed channel - is triangular with retraction resisted by plunger on ramped edge - Google Patents

Abstract

The pivoting blade cutters (4) on a straw cutting machine operate in the feed channel (1) of a loading carriage. The cutters (4) are of an approximate triangular shape, pivot about an axis (b) through their bottom (4a) and only move aside in the presence of foreign objects. Once they have moved aside their cutting action is reduced. The cutters (4) penetrate the channel from one side and act with components of the feeding mechanism. the components penetrate on the opposite side of the channel. A top apex (4c) leads the movement of the cutter through a guide grid (3) and a coplanar passage between two parallel plates (11) gives further guidance. The path taken by the cutter is controlled by a stud (14) in a curved slot (13), and retraction is resisted by a spring loaded cam (17 to 20) acting on a ramped (16b) and notched (16)a) edge. Alternatively the slot (13) may be inclined and the stud (14) able to move against a spring.

Description

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VO 8213

Loading trolley with a cutting device for culm and leaf material.

The invention relates to a loading wagon with a cutting device for blade and blade material, in which knives are assigned to transport teeth which engage in the transport channel of the loading wagon, the blades of which from the side of the transport channel opposite the transport teeth 5 are inclined against the conveying direction thereof, the knives being hung separately and at the end thereof facing opposite to the material conveying direction on a hinge located outside the transport channel against the resilience of a co-acting with the knife back above the hinge and the knives in the spring-holding spring-holding device are arranged pivotally at least partly outside the transport channel.

With cutting devices of this kind, when hard objects, such as stones, which may be present in the blade or blade material, are hit, a diversion of the knives is intended so that the cutting edges of the knives are not damaged.

In a device of the type mentioned in the opening paragraph, known from German Gebrauchsmuster 6912666, the spring device consists of a spring-loaded latch hinged to the transport channel, which in the working position cooperates with an oblique latch at the bottom of the latch. pin attached to the back of the knife.

When the blades are overloaded, the pins press against the inclined running surfaces of the latches, the latches move out of the latch position, and then slide back again further increasing the spring pressure along the bottom edge. Conversely, upon termination of the overload condition, the latch pushes the knives back into the working position by pressing the pin.

A drawback here is that the knives can also pivot back when the transport cutting pressures are increasing, for example when the knives become blunt, and then only cut partially or not at all. The material that has not been cut or is only partly cut cannot subsequently be discharged from it as well with loading wagons and also presents difficulties during storage, for example during silage and / or feeding.

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The object of the invention is a loading wagon with a cutting device of the type mentioned in the preamble, wherein the knives remain in the cutting position during normal cutting and only swing back when they come into contact with foreign objects - and only as long as they are in contact with them.

For this purpose the loading wagon has the feature that the hinge is designed in such a way that the knives can be displaced approximately in the cutting or transport direction and the spring device together with the knife suspension is designed as a knife support active over the entire sliding and pivoting path, such that in the cutting position of the knives, it acts as a latch of adapted shape under the pressure of the spring and / or the cutting pressure of the conveying material, which pivoting movement of the knives only in the direction of its movement in the direction opposite to that of the hinge the material flow.

15 During loading, the knives are primarily held in the locking position by the transport and cutting pressure of the material, only at higher pressure from foreign bodies which cannot be cut by the knives, the knives can move against the material flow and through this shift out of the locked position and swing back. It is clear that this idea can be realized in several ways.

For example, in front of the knife suspension, there can always be a guide slot in the knives, in which a stud bolt assigned to it stationary, anchored in the knife handle, engages, the guide slot describing an arc corresponding with the pivot radius of the respective knife about the hinge and in a bent portion forms a cam member extending against the main conveying direction.

To illustrate the invention, some exemplary embodiments will now be described, with reference to the drawing. In the drawing: Fig. 1 shows a cross section of a cutting device arranged in the transport channel of a loading wagon; fig. 2 shows a top view of the device according to fig. 1; Fig. 3 shows a view corresponding to fig. 1 of a second exemplary embodiment of the cutting device; and 860 1 6 0.9 -3- Fig. 4 shows a top view of the device according to Fig. 3.

In the embodiment according to Figs. 1 and 2, knives 45 are arranged side by side in a transport channel 1 of a loading wagon, which channel is bounded by an inner channel plate 2 and an outer channel plate 3. The knives are inserted at their lower top 4a in slots 5 of a cross beam 6 and penetrate the transport channel 1 obliquely from bottom to top with their cut 4b. With their top cutting point 4c they dive into slots or crevices 8 in the outer channel wall 3, through which teeth 9 of an unsealed transport device 10 extend into the transport channel 1. The teeth 9 engage with two fingers 9a and 9b - see fig. 2 - the knives in their passage in the direction of the arrow a. At the top of the knife ridges 4b, a cross beam 10 is arranged on the inner channel wall 2, at the bottom of which supporting supports 11 and 12 are connected, which form the blade half and the sheath 15, respectively, in which the blades 4 are fixed. The carrying supports 11 and 12 are provided with piercing holes (not shown) for a plug bolt 14. With these bolts the knives 4 are attached to a guide groove 13, which runs according to a pivoting arc, in a pivoting manner. The top 4a and the slit 5 form the hinge.

A notch 16 is arranged on the top of the knife back 4d, against which the bent end 17 of at least one spiral spring 18 mounted on one of the cross beams 10 can be pressed and the knives 4 in the working position, while at the bottom tip 25 occupy the position shown by solid lines in the piercing slot 5.

According to the invention a downwardly bent latch 9 connects to the guide gap 13. Under the pressure of the spring ends 17 and the transport pressure acting in the direction of the arrow a, the knives 30 are retained in shape in the latch 19 and cannot swing back.

As soon as foreign bodies, such as for instance stones or teeth from harvesting machines collide with the cutting edge 4b, the knives can only swing back into the striped position when the foreign bodies 35 press against the upper blade half, whereby the resultant 8601609

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-4- moment that the knives move against the transport direction - arrow a - in the slots or slits 8 in the striped position. The plug pin or bolt 14 then enters the guide slot 13 and the knives can now pivot back. In those evasive positions, the knives allow foreign bodies to pass.

If the knives 4 have to be removed in order to be sharpened or replaced, the plug bolts 14 are removed and the spring ends 17 retracted.

In the embodiment according to Figs. 3 and 4, the knives 10 24, in contrast to the above-described exemplary embodiment, are held pivotally and vertically movable by means of vertical slots 25 and bolts 26. Slots 27 in this exemplary embodiment are provided with a deflected locking bearing 28 for a bolt 30 which can be inserted into a blade half 29 and are held in the cutting position (full position) by compression springs 31 engaging a rear knife extension 24a.

The latter support on a piston 33 arranged on a cross beam 32.

This embodiment can advantageously be used where the spring device cannot be arranged above the knives.

20 8601609

Claims (5)

1. Loading wagon with a cutting device for blade and sheet material, in which knives are assigned to conveyor belts engaging in the transport channel of the loading wagon, the blades of which, from the side of the transporting channel opposite the conveyor belts, are obliquely against the direction of transport thereof the knives are hung separately and at the end thereof directed opposite the material transport direction on a hinge located outside the transport channel against the spring force of a spring device co-acting with the knife back above the hinge and at least holding the knives in the cutting 10 'position are pivotally disposed outside the transport channel, characterized in that the hinge (4a, 5? 25, 26} is designed such that the knives (4; 24) are displaceable approximately in the cutting or transporting direction and the spring device (16 -18; 24a, 31) together with the blade suspension 15 (13, 14, 19; 27, 28, 30) as a Knife support over the entire sliding and swiveling path is designed in such a way that it is in the cutting position of the knives (4; 24) under pressure of the spring (18; 31} and / or the cutting pressure of the transport material acting as a latch of adapted shape, which pivots the blades (4; 24) only after their displacement in the hinge (4a, 5; 25, 26) in a direction opposite to the material flow. Loading wagon according to claim 1, characterized in that for the knife suspension in the knives (4, 24) there is always a guiding slot (13; 27) in which a stationary assigned to it is anchored in the knife handle (11, 12}). the stud (14; 28) engages, the guide slot (13; 27) describing an arc corresponding to the pivot radius of the respective blade (4; 24) about the hinge (4a, 5; 25, 26) and in a bent portion a cam member (19; 28) extending against the main conveying direction. Loading wagon according to claim 1 or 2, characterized in that the hinge is designed as a bolt-slot connection (25, 26) or as a plug connection (4a, 5). 8601609. £ V Λ -6- Loading wagon according to any one of the preceding claims, characterized in that the knives (24) are always provided on their ridges with a downwardly directed projection (bent part 24a), which is always in the free end of a collar ( 33) of a beam 5 (32) supported compression spring (31) engages. Loading wagon according to claim 1, characterized in that the knives (4) are always provided on their ridges (4d) with a notch (16), in which in each case a coil spring (18) mounted on a cross beam (10) with engages at least one deflected portion (17). 10 8601609