Working Principle and components of Mower
i. Frame: – The frame provides space for gears, clutch and bearings. The leaver for lifting the cutting bar is attached to the frame.
ii. Power transmitting unit: – for
- Animal drawn: – it consists of axle, gears, crank wheel, crankshaft and pitman
- Tractor drawn: – pulley connected with PTO shaft with universal joint.
iii. Cutting bar: – It is an assembly comprising of fingers, knife guides, wearing plates and shoes. It works like a knife. The knife section makes reciprocating motion and cuts the plants. The knife stops at the center of the guard on each stroke. There are ledger plates provided with the knife guard, on which the knife moves.
iv. Shoes: – A shoe on each end of the cutter bar is always provided to regulate the height of cut above the ground.
v. Ledger plate: – It is a hardened metal inserted in a guard over which knife sections move to give a scissor like cutting action.
vi. Wearing plate: – It is a hardened steel plate attached to the finger bar to form a bearing surface for the back of the knife.
vii. Knife: – It is the reciprocating part of the cutter bar, comprising of knife head (portion of knife connected to pitman), knife back (strip which knife sections are riveted and knife head is attached) and knife sections (flat plate with two cutting edges).
viii. Grass board: – It is provided at the cutter end of the mower which causes the cut plants to fall towards the cut material.
ix. Pitman: – It is pinned to the crankshaft with the help of a pin. It transmits reciprocating motion to a knife head.