DE68122C - Auxiliary sieve for threshing machines - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In the previously used adjusting devices on threshing machines, the short straw and the chaff coming from the threshing drum and the straw shakers are put together on one and the same sieve, the so-called. Chaff sieve (caving riddle) , which serves to remove the short straw with empty ear heads, thistle heads or the like from the side of the machine, while broken heads with seeds in them, as well as isolated short pieces of straw, coffee and grain go through the sieve to open a row of sieves following one another to be further separated from one another. The first following, so-called. "Coffee sieve" (chaff riddle), which is erroneously called "chaff sieve", separates the coffee from the machine, and the following "grain sieve" (coping riddle) serves to let the grain pass through while the occasional short ones Straw parts of ears, poppy heads etc. (copings) can be removed from the side of the machine. The last following " dust riddle " then has to separate the dust from the grain.

It has now been shown in practice that the actual chaffing sieve (caving riddle), which alone is supposed to sieve off the material coming together from the drum and the straw shakers, does not have enough sieve surface to meet the requirements placed on it; this is especially the case in hot countries, when the straw is broken up by the threshing drum and a great deal of chaff is produced as a result, so that the chaff sieve is overfilled and grains of grain are lost with the chaff.

In order to remedy this inconvenience and to bring about a better separation of the cereal grains from the chaff, an auxiliary sieve is attached according to the present invention below the straw shaker and above the known chaff sieve (caving riddle) , which has the purpose of relieving the usual chaff sieve, namely in the Make sure that this auxiliary sieve separates a large part of the chaff which would otherwise end up on the ordinary chaff sieve and removes it from the machine, so that only that part of the chaff which falls through this auxiliary sieve as well as the chaff coming from the drum is opened the ordinary chaff sieve arrives.

The auxiliary screen can expediently be connected to the upper or lower vibrating screen stand, but the same can also be connected to or through the straw walkers a special drive can be set in motion. Depending on the ■ arrangement of the drive if the movement of this auxiliary screen is different, preferably the same receives one reciprocating motion.

1 and 2 of the drawing illustrate a threshing machine with drum A, threshing concave B, the straw shakers C and the usual sieve D. Between these and the straw shakers C , the auxiliary sieve E is arranged. That from the auxiliary sieve E

Short straw delivered can either fall at F into the long straw coming from the straw walkers C, as indicated in the drawing, or an opening H can be attached through which it falls into the chaff coming from the main sieve JD.

The short straw, the chaff, as well as the grains which fall through the straw shaker C do not get directly onto the main sieve D, but first onto the auxiliary sieve E, through which a large part of the short straw and the chaff is conveyed out of the machine , while only a small part with ears and grains falls through and reaches sieve D. So this only receives directly from the concave, but from the straw walkers already pre-cleaned threshed material.

Since the auxiliary sieve removes a large part of the straw from the machine, less material reaches the ordinary sieve D for processing, and this can therefore more easily remove the grains from the chaff. ;

Claims (1)

Patent claim: A threshing machine, characterized by a switched between the straw walkers C and the main screen D, suitable for moving auxiliary wire E which is to relieve the main screen, the falling through the straw walkers part of grain and straw receives' and purified supplying the main screen, while those grains and straw parts, which come directly from the concave, go directly to the main sieve. For this purpose ι sheet of drawings.