< Topic >Depending upon the size of the grain of the farmland, the screen where it is not necessary to exchange the screen where size of the mesh differs every time is offered.SolutionsCoarsely the eye and the medium eye, collecting the screen where size of the mesh such as detail differs to 3 formation, it makes one screen 4. The farmland classified by size of the grain remains in oversize of each stratum, it is not necessary to exchange the screen where the mesh differs one by one. It inserts bridge 5 and, sets from opening and 6 it is something in order to support each network equipped drawer where the mu mesh differs densely, total 6 it is installed on left and right. Because of this the fact that the drawer bends easily at the weight which receives the farmland and/or becomes deformed is prevented. As for the material it is desirable for everything to be formed also for rust prevention with the stainless steel.< Choice figure >Drawing 2【課題】用土の粒の大きさによって、網目の大きさの異なるフルイをその都度交換する必要のないフルイを提供する。【解決手段】粗目、中目、細目といった網目の大きさの異なるフルイを3層にまとめて一つのフルイ4にする。用土は粒の大きさ別に各層の網上に留まり、網目の異なるフルイをいちいち交換する必要がない。桟5は、差入れ口6からはめこむ網目の異なる各網付き引き出しを支えるためのものであり、左右に合計6本設置されている。これにより用土を受けた重量で引き出しが容易にたわんだり変形したりするのを防ぐ。素材は全てがサビ防止のためにもステンレスで形成されることが望ましい。【選択図】図2
