DE1582568C - Knife sharpening device on chopping machines - Google Patents

Description

_so claim:

Knife sharpening device on forage harvesters with a rotating knife drum and a

* Counter knife mounted in the chopper housing and one driven by the chopping machine

Grinding wheel that can be moved on a shaft mounted on swivel arms parallel to the drum axis is arranged, characterized in that that for grinding the counter knife (4) on the chopping machine in that of the drum

(1) facing away from the swivel area of the grinding wheel (8) a clamping device (23, 24, 25) i for the counter knife is arranged.

1 sheet of drawings

Claims (1)

. The invention relates to a knife sharpening device on chopping machines with a rotating knife drum and one mounted in the chopper housing Counter knife and a grinding wheel driven by the chopping machine, which is on a parallel to the drum axis mounted on swivel arms shaft is displaceable. . Grinding devices of this type are known in chopping machines. They enable the knife too grind without removing them from the machine. As is well known, need to get the cutting action of the machine to maintain, not only the knife, but also the shearbar at certain time intervals be sanded. In the known chopping machines, the counter knife is after Expansion ground on a stationary grinding machine. Since this is mostly hands-free, i. H. without corresponding Jig, happens, is also the grinding quality and the evenness of the cutting edge of the counter knife according to what is. of course on the way the chopper works and the quality of the chop has a detrimental effect. The object of the invention is to provide the known knife sharpening device on chopping machines so that the counter knife is also ground can be. This object is achieved in that for grinding the counter knife on the The chopping machine has a clamping device in the swivel area of the grinding wheel facing away from the drum is arranged for the counter knife. The counter knife can be clamped in this clamping device and with the knife sharpening device located on the chopping machine in a short time Time and be sanded evenly. The invention is described below with reference to the exemplary embodiment shown in the drawing explained in more detail: Fig. 1 shows the knife sharpening device in a Position when grinding the drum knives; F i g. 2 shows a section AA of the grinding device according to FIG. 1; F i g. 3 shows the knife grinding device in a position when grinding the counter blade, In the machine shown in the drawing, on which the grinding device according to the invention is arranged is, it is a drum chopper, the drum 1 rotatable on a mobile or stationary machine frame 2 is mounted and equipped with the knives 3. The knives brush against one Counter knife 4 past which you chop the material pushed forward over the counter knife. The drum 1 is firmly connected to its shaft 5, which its power drive from any suitable Energy source, e.g. in the case of a forage harvester, from the tractor's PTO shaft. Parallel to the drum shaft 5 is arms 6 pivotably mounted on both sides of the machine frame a shaft 7 rotatably mounted on which a grinding wheel S is arranged. The grinding wheel 8 is with the shaft 7 via a groove 9 provided in the shaft and a spring 10 in a rotationally fixed manner. The length of the Groove 9 corresponds at least to the width of the drum 1, so that the grinding wheel 8 in this area is displaceable on the shaft 7. One in the machine frame 2 is used to move the grinding wheel 8 guided displacement rod 11 which is connected to a claw 12 surrounding the grinding wheel 8. Of the levers 6, which support the shaft 7 and are pivotable about their pins 13, one is designed as a double lever, at the other end 14 of which a threaded spindle 15 engages, which is mounted in a bearing 16 and can be operated with a rotary knob 17 provided at the end. If the threaded spindle 15 is rotated, the shaft 7 pivots with the Grinding wheel 8 around the bearing pin 13. To enable pivoting, are in the walls of the machine frame 2 elongated holes 18 are provided. The shaft 7 is driven by a V-belt drive 19 from the drum shaft 5. The V-belt drive 19 is under the effect a spring 20 standing tension roller 21 tensioned. By pivoting the tension roller 21 out of her In the clamping position, the drive of the shaft 7 can be switched off. But you can also use the V-belt drive 19 belonging V-belt pulley 27 loosely store on the drum shaft 5 and with a the shaft 5 arranged on and off driver ring 22 or some other coupling the Establish or interrupt drive connection. In the pivoting area of the grinding wheel 8 facing away from the drum 1 is on both sides of the machine frame 2 each one consisting of a U-shaped bracket 23 and clamping screws 24 provided therein, 25 existing clamping device arranged. This clamping device is used to clamp the shearbar 4 for grinding. The shear bar 4 can thus in the simplest way after loosening it in Operating position holding screws 26 pulled out of the chopper housing and used for grinding are inserted into the clamping device 23, 24, 25. By turning the spindle 15 with which the grinding wheel 8 is in the grinding position on the to be ground Knife is employed, the grinding wheel in the in F i g. 3 position shown for grinding the Shear bar 4 can be swiveled. When the grinding is finished, the grinding wheel 8 is in a central position pivoted between drum 4 and clamping device 23,24,25 and the drive 19 is switched off.