FR2482821A1 - CUTTING DEVICE FOR A HARVESTING MACHINE - Google Patents

Abstract

A CUTTING DEVICE FOR A HARVESTING MACHINE INCLUDES TWO 1, 2-TOOTH AND OVERLAPPING ROTATING CUTTING DISCS. TO PREVENT THE TEETH 6, 7 FROM SEIZING HARD OBJECTS, THEY SHALL HAVE A SHAPE SUCH AS, DURING THE ROTATION OF THE DISCS THEIR SIDES 8, 9 SITUATED FURTHER IN THE DIRECTION OF ROTATION 3, 4 OF THE DISCS NE ARE NOT TAKEN IN A PERPENDICULAR POSITION TO THE RIGHT 14, CONNECTING THE CENTERS OF THE DISCS TO ONE HIM, BEFORE THE POINTS 10, 11 GO THROUGH THE INTERSECTION OF THE TRAJECTORIES FOLLOWED BY THE POINTS OF THE TEETH OF THE TWO DISCS, SUCH AS THE SIDES 8, 9 TEETH TEND TO PUSH HARD OBJECTS.

Description

Cutting device for a harvesting machine.

  The present invention relates to a cutting device for a harvesting machine, in particular a corn harvester, which cutting device comprises two rotary and circular cutting disks which are toothed and overlapped. The object of the invention is to create a device for

  cut of this kind which eliminates the risk of seeing stones

  res or other hard objects get caught between the teeth of

  sharp discs, which would damage the discs

  ques edged or their drive members; this object is achieved according to the invention by the fact that for each tooth the angle formed by the side of the tooth located furthest forward (in the direction of rotation) and the tangent, through the tip of the tooth , the circular path of this tooth point is less than or equal to the angle formed by a

radius of the toothed disc passing through the intersection of the paths

circular roofs of the tips of the teeth of the two discs

  teeth and the straight line connecting the centers of rotation

tion of the two toothed discs.

  This arrangement of the cutting discs makes it possible to obtain

note that during rotation the sides of the teeth furthest forward in the direction of rotation do not reach a position such that the angle formed by one side of the teeth of a cutting disc and one side of the teeth of the other cutting disc is zero before the cutting discs begin to overlap. Therefore these sides of

teeth of the cutting discs will essentially have

dance to repel hard objects, thus avoiding any risk

than serious damage to the cutting discs.

In a cutting device of this kind we will use

often a tooth shape where the sides of the tooth are in-

curved and such an embodiment must also re-

meet the conditions set out above, reason for the-

which it is determined according to the present invention that the theoretical tip of the tooth is located at the intersection of a radius passing through the top of the tooth and

  and tangent, to the side of the tooth most furthest a-

  in the direction of rotation, which makes the greatest angle

  with the tangent, at the level of said vertex, to the path actually

  killed by the theoretical tooth tip.

  The invention is described in more detail below with reference to the accompanying drawing in which:

  Figure 1 shows overlapping parts

  toothed discs of a cutting device

before the invention; and

  Figure 2 shows part of a form of reaction

particular reading of a toothed disc for a device

cutting like this.

Figure 1 shows parts partially overlapping two cutting discs 1 and 2 arranged

to turn in the direction indicated by arrows 3 and 4.

  Mounted in a harvesting machine, this cutting device is intended to advance in the direction indicated by the arrow 5

to cut the crop.

Discs 1 and 2 are provided with

teeth 6 and 7 whose respective sides 8 and 9, which are

  the most forward wind in the direction of rotation, are rec-

  tilines. The tips of the teeth are designated respectively-

  ment by 10 and 11 and a tangent to the path taken by the tooth points 10 is designated by 12 while a

  radius of the toothed disc 1 passing through the intersection of the

  courses carried out by - tooth points 10 and It is designated by 13. A straight line connecting the centers

  of the two toothed discs 1 and 2 is designated by 14 and the an-

gle o (formed by this straight line and the radius 13 is, in the embodiment shown, exactly equal to the angle

  / 3 formed by the tooth side 8 and the tangent 12. This signifies

fie that the two sides of tooth 8a and 9a meet just when they are parallel to each other. If the angle / 3 is made smaller than the angle c, the sides of tooth 8a and 9a

will diverge when they reach the position shown.

Figure 2 shows a part of a toothed disc 15 having teeth 16 whose sides 17, located furthest forward in the direction of rotation, are curved. When it comes to making such toothed discs in accordance with the rule set out above, a theoretical tooth tip 18 is determined to be the intersection of a radius 19 passing through the top 20 of the tooth, and the tangent 21, to the side of tooth 17, which makes the greatest angle with a tangent 22 to the path 23 made by the tooth tip

theoretical 18.

24 & 2821

Claims (1)

CLAIMS I - Cutting device for a harvesting machine, in particular a corn harvester, which device comprises two cutting discs. rotary and circular (1,2) which are toothed and overlap, characterized in that for each tooth (6, 7) the angle / 3 formed by the side (8,   9) of the tooth, located furthest forward in the direction of ro- tation (3, 4), and the tangent (12), through the tip (10) of the tooth, to the circular path of this tooth tip is less than or equal to the angle "formed by a radius (13 ) of the toothed disc passing through the intersection of the circles of   movement of the points (10) of the teeth of the two discs   tees and the straight line (14) connecting the centers of ro tation of the two toothed discs.   2 - Cutting device according to claim 1, the c8tés of the teeth being curved, characterized in that the theoretical tip (18) of the tooth (16) is located at the intersection of a radius (19) passing through the top (20) of the tooth (16), and of the tangent (21), to the side (17) of the tooth which is located. the most forward in the direction of rotation, which makes the greatest angle with the tangent (22), at the level of said vertex, at the course (23) made by the point of theoretical tooth (18).