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The present invention relates to a discharge stopper unit for a mowing machine having a mower deck. The discharge stopper unit has a discharge stopper adapted to block a discharge opening in the mower deck and an arm connected to the discharge stopper. Preferably, the arm has a biasing member which

The present invention relates to a discharge stopper unit for a mowing machine having a mower deck. The discharge stopper unit has a discharge stopper adapted to block a discharge opening in the mower deck and an arm connected to the discharge stopper. Preferably, the arm has a biasing member which produces a securing force on the discharge stopper.

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1. A discharge stopper unit for a mowing machine having a mower deck which defines a discharge opening, the discharge stopper unit comprising:a discharge stopper adapted to block the discharge opening; and an arm having a first end and a second end, the first end pivotally connected to the discharge

1. A discharge stopper unit for a mowing machine having a mower deck which defines a discharge opening, the discharge stopper unit comprising:a discharge stopper adapted to block the discharge opening; and an arm having a first end and a second end, the first end pivotally connected to the discharge stopper and the second end removably engagable with a portion of the mowing machine, the discharge stopper and the arm movable between: (a) a first position for stopping discharge wherein the discharge stopper is engaged with the mower deck and the second end of the arm is engaged with the portion of the mowing machine; and (b) a second position for enabling flow of discharge wherein the discharge stopper and the arm are disengaged from the mowing machine. 2. The discharge stopper unit of claim 1, wherein the arm is so positioned that the arm extends into a discharge chute of the mowing machine when the discharge stopper and the arm have the first position, the arm having a position substantially parallel to a longitudinal axis of the discharge chute.3. The discharge stopper unit of claim 1, wherein the arm is a spring-loaded arm which biases the discharge stopper against the mower deck when the discharge stopper and the arm have the first position.4. The discharge stopper unit of claim 1, wherein the arm has at least one biasing member adapted to produce a force biasing the discharge stopper against the mower deck when the discharge stopper and the arm have the first position.5. The discharge stopper unit of claim 1, wherein the second end of the arm has an engaging member adapted to engage with the portion of the mowing machine.6. A discharge stopper unit for a mowing machine having a mower deck which defines a discharge opening, the discharge stopper unit comprising:a discharge stopper adapted to block the discharge opening; and an arm having a biasing member operatively engaged with an extension member, the extension member having a first end pivotally connected to the discharge stopper and a second end, the second end having an engaging member removably engagable with a portion of the mowing machine, the discharge stopper and the arm movable between: (a) a first position for stopping discharge wherein: (i) the discharge stopper is engaged with mower deck; (ii) the second end of the arm is engaged with the portion of the mowing machine; and (iii) the biasing member biases the discharge stopper against the mower deck; and (b) a second position for enabling flow of discharge wherein the discharge stopper and the arm are disengaged from the mowing machine. 7. The discharge stopper unit of claim 6, wherein the first end of the extension member is hingedly connected to the discharge stopper.8. The discharge stopper unit of claim 6, wherein the biasing member includes at least one spring.9. The discharge stopper unit of claim 6, wherein the engaging member has at least one guide member.10. The discharge stopper unit of claim 6, wherein the engaging member has a fastening member.11. The discharge stopper unit of claim 6, wherein the discharge stopper has at least one guide member to facilitate guidance of the discharge stopper into the first position.12. A mower assembly for a mowing machine, comprising:a mower deck which defines a discharge opening; a discharge chute in communication with the discharge opening; a discharge stopper; and an arm connected to the discharge stopper, the arm having a first end and a second end, the first end pivotally coupled to the discharge stopper, the discharge stopper and the arm movable between: (a) a first position for stopping discharge wherein: (i) a portion of the arm has a position inside the discharge chute, said position being substantially parallel to a longitudinal axis of the discharge chute; (ii) the discharge stopper is engaged with the mower deck; and (iii) the second end of the arm is engaged with a portion of the mowing machine; and (b) a second position for enabling flow of discharge wherein the discharge stopper and the arm are disengaged from the mowing machine. 13. The mower assembly of claim 12, wherein the arm is hingedly connected to the discharge stopper.14. The mower assembly of claim 12, wherein the arm has at least one biasing member adapted to produce a force biasing the discharge stopper against the mower deck when the discharge stopper and the arm have the first position.15. The mower assembly of claim 12, wherein the arm has an engaging member adapted to engage with the portion of the mowing machine.16. The mower assembly of claim 15, wherein the engaging member has at least one guide member.17. The mower assembly of claim 15, wherein the engaging member has a fastening member.18. The mower assembly of claim 12, wherein the mower deck is a rear discharge mower deck.19. The mower assembly of claim 12, wherein the mower deck has a discharge wall which defines the discharge opening.20. The mower assembly of claim 19, wherein the discharge wall has at least one guide member to facilitate guidance of the discharge stopper into the first position.21. The mower assembly of claim 20, wherein the discharge stopper has at least one guide member which co-acts with the guide member of the discharge wall to facilitate guidance of the discharge stopper into the first position.22. A mowing machine comprising:a frame; a power unit supported by the frame; a drive mechanism coupled to the power unit; a plurality of wheels rotatably connected to the frame; and a mower assembly supported by the frame, the mower assembly having a mower deck which defines a discharge opening, a discharge chute in communication with the discharge opening, a discharge stopper, and an arm connected to the discharge stopper, the arm having a first end and a second end, the first end pivotally coupled to the discharge stopper, the discharge stopper and the arm movable between: (a) a first position for stopping discharge wherein: (i) a portion of the arm has a position inside the discharge chute, said position being substantially parallel to a longitudinal axis of the discharge chute; (ii) the discharge stopper is engaged with the mower deck; and (iii) the second-end of the arm is engaged with a portion of the mower deck; and (b) a second position for enabling flow of discharge wherein the discharge stopper and the arm are disengaged from the mowing machine. 23. The mowing machine of claim 22, wherein the arm is hingedly connected to the discharge stopper.24. The mowing machine of claim 22, wherein the arm has at least one biasing member adapted to produce a force biasing the discharge stopper against the mower deck when the discharge stopper and the arm have the first position.25. The mowing machine of claim 22, wherein the second end of the arm has an engaging member adapted to engage with the portion of the mowing machine.26. The mowing machine of claim 22, wherein the mower deck is a rear discharge mower deck having a position which is adjustable relative to the frame.27. A method of stopping material from discharging from a discharge opening defined by a mower deck of a mowing machine, the mowing machine including a discharge chute having a first end in communication with the discharge opening and a second end, the method comprising the steps of:(a) grasping an arm pivotally coupled to a discharge stopper; (b) lifting the arm and the discharge stopper from a first position; (c) inserting the discharge stopper into the discharge chute; (d) using the arm to move the discharge stopper from the second end to the first end of the discharge chute; (e) positioning the discharge stopper on the mower deck so as to block the discharge opening; (f) pushing the arm in a direction of the discharge stopper; (g) engaging the arm with a support member coupled to the mowing machine; and (h) releasing the arm thereby biasing the discharge stopper against the mower deck. 28. The method of claim 27, wherein step (f) includes the step of compressing at least one spring which co-acts with the arm.29. The method of claim 27, wherein step (h) includes the step of enabling an extension of at least one spring which co-acts with the arm.30. The mowing machine of claim 22, wherein the portion of the mowing machine includes a support member coupled to the frame.31. A discharge stopper unit for a mowing machine having a mower deck including at least one discharge wall which defines a discharge opening, the mowing machine further including an elongated discharge chute in communication with the discharge opening, the discharge chute having a first chute end and a second chute end positioned along a longitudinal axis, the discharge stopper unit comprising:an arm having a first arm end, a second arm end and an extension member positioned between the first arm end and the second arm end, the extension member having a length sufficient to enable the first arm end to have a position adjacent to the first chute end and the second arm end to have a position adjacent to the second chute end while the extension member has a position inside the discharge chute substantially parallel to the longitudinal axis; and a discharge stopper pivotally coupled to the first arm end, the discharge stopper including at least one guide member having at least one surface adapted to slidably engage with the discharge wall of the mower deck wherein the guide member is operable to guide positioning of the discharge stopper on the mower deck. 32. The discharge stopper unit of claim 31, wherein the arm has a length which is equal to or greater than a length of the discharge chute.33. The discharge stopper unit of claim 31, wherein the guide member is integral with the discharge stopper.34. The discharge stopper unit of claim 31, wherein the discharge stopper has a plurality of guide members each of which has at least one surface adapted to slidably engage at least one of a plurality of guide walls connected to the discharge wall.