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A developer supply cartridge detachably mountable to a main assembly of an image forming apparatus includes: a developer accommodating portion; a shutter portion movable between a closed position and an open position; and a movable portion for moving the shutter portion. The movable portion is movab

A developer supply cartridge detachably mountable to a main assembly of an image forming apparatus includes: a developer accommodating portion; a shutter portion movable between a closed position and an open position; and a movable portion for moving the shutter portion. The movable portion is movable between a first position where the shutter portion is positioned in the closed position. The movable portion performs a preventing operation for preventing movement thereof to the first position by engagement thereof with an engaging portion, provided in the main assembly side, when the movable portion is positioned in the second position during movement of the developer supply cartridge to the main assembly.

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1. A developer supply cartridge detachably mountable to a main assembly of an image forming apparatus for forming an image on a recording material by developer, said developer supply cartridge comprising: an accommodating portion, provided with a supply opening for permitting discharge of developer,

1. A developer supply cartridge detachably mountable to a main assembly of an image forming apparatus for forming an image on a recording material by developer, said developer supply cartridge comprising: an accommodating portion, provided with a supply opening for permitting discharge of developer, for accommodating the developer;a shutter portion movable between a closed position where the supply opening is closed from an outside of said accommodating portion and an open position where the supply opening is open to the outside; anda movable portion for moving said shutter portion, wherein said movable portion is movable between a first position where said shutter portion is positioned in the closed position and a second position where said shutter portion is positioned in the open position, andwherein said movable portion in the first position is engaged with an engaging portion so that said movable portion is moved with the movement of said developer supply cartridge and then said movable portion is positioned in the second position when said developer supply cartridge reaches a mounting position, the mounting position being a position where said developer supply cartridge is mounted to the main assembly,wherein said movable portion performs a preventing operation for preventing movement thereof to the first position when said movable portion is positioned in the second position during mounting of said developer supply cartridge to the main assembly, andwherein, said movable portion is moved from the second position to a preventing position in the preventing operation, the preventing position being a position where said shutter portion is positioned in the open position and said movable portion is located at a position different from the second position. 2. A developer supply cartridge according to claim 1, wherein when said movable portion moves to the preventing position and then, when said developer supply cartridge reaches the mounting position, said movable portion returns from the preventing position to the second position. 3. A developer supply cartridge according to claim 1, wherein said movable portion includes a force receiving portion for receiving a force from the engaging portion in contact with the engaging portion during the mounting of said developer supply cartridge to the main assembly, and wherein said movable portion is moved from the second position to the preventing position by the force applied from the engaging portion to said force receiving portion when said movable portion is positioned in the second position during the mounting of said developer supply cartridge to the main assembly. 4. A developer supply cartridge according to claim 3, further comprising urging means for urging said movable portion so as to move from the preventing position to the second position, wherein said movable portion is moved from the second position to the preventing position, in a state in which an urging force of said urging means is applied to said movable portion, by the force applied from the engaging portion to said force receiving portion, and is returned from the preventing position to the second position when said developer supply cartridge reaches the mounting position. 5. A developer supply cartridge according to claim 3, wherein said force receiving portion in an inclined surface inclined with respect to a movement direction of said developer supply cartridge, and said force receiving portion receives a force from the engaging portion for moving said movable portion from the second position to the preventing position by movement of said developer supply cartridge. 6. A developer supply cartridge according to claim 1, wherein said movable portion is moved to the second position by engagement with the engaging portion when said movable portion is positioned between the first position and the second position during the mounting of said developer supply cartridge to the main assembly. 7. A developer supply cartridge according to claim 1, wherein said shutter portion is a rotatable member and has a shape such that said rotatable member is capable of blocking the supply opening from the outside in a rotational phase in the closed position and is capable of opening the supply opening to the outside in a rotational phase in the open position. 8. A developer supply cartridge according to claim 7, wherein said shutter portion is provided with a through hole formed so as to permit communication between the supply opening and the outside in the rotational phase in the open position. 9. A developer supply cartridge according to claim 1, further comprising driving means for driving a shutter mechanism for opening and closing a receiving opening of a developer accommodating portion of a process cartridge mounted to the main assembly. 10. A developer supply cartridge according to claim 9, wherein said driving means drives the shutter mechanism so that the receiving opening is placed in an open state before movement of said shutter portion is started. 11. A developer supply cartridge according to claim 1, wherein said movable portion is moved by engagement with the engaging portion provided to a process cartridge mounted to the main assembly. 12. A developer supply cartridge according to claim 1, wherein said movable portion is provided by engagement with the engaging portion provided to the main assembly. 13. A developer supply cartridge detachably mountable to a process cartridge, detachably mountable to a main assembly of an image forming apparatus, for performing an image forming process for forming an image on a recording material by developer, said developer supply cartridge comprising: an accommodating portion, provided with a supply opening for permitting discharge of developer, for accommodating the developer;a shutter portion movable between a closed position where the supply opening is blocked from an outside of said accommodating portion and an open position where the supply opening is open to the outside; anda movable portion for moving said shutter portion, wherein said movable portion is movable between a first position where said shutter portion is positioned in the closed position and a second position where said shutter portion is positioned in the open position, and wherein during movement of said developer supply cartridge to a mounting position when said developer supply cartridge is mounted to the process cartridge, said movable portion is moved with the movement of said developer supply cartridge by engagement thereof with an engaging portion provided to the process cartridge so that said movable portion is engaged with the engaging portion in the first position to start movement thereof and is positioned in the second position when said developer supply cartridge reaches the mounting position,wherein said movable portion performs a preventing operation for preventing movement thereof to the first position by engagement thereof with the engaging portion when said movable portion is positioned in the second position during mounting of said developer supply cartridge to the process cartridge, andwherein, when said movable portion is positioned in the second position during the mounting of said developer supply cartridge to the main assembly, until said developer supply cartridge reaches the mounting position said movable portion prevents the movement thereof to the first position by movement thereof from the second position to a preventing position by the engagement thereof with the engaging portion. 14. A process cartridge, detachably mountable to a main assembly of an image forming apparatus, for performing an image forming process for forming an image on a recording material by a developer, said process cartridge comprising: a developer supply cartridge according to claim 13 detachably mounted thereto. 15. An image forming apparatus for forming an image on a recording material by a developer, comprising: a developer supply cartridge according to claim 1. 16. An image forming apparatus according to claim 15, further comprising a process cartridge, detachably mountable to the main assembly, for performing an image forming process for forming an image on a recording material by the developer. 17. A developer supply cartridge detachably mountable to a main assembly of an image forming apparatus, said developer supply cartridge comprising: an accommodating portion, provided with a supply opening for permitting discharge of developer, for accommodating the developer;a shutter portion movable between a closed position where the supply opening is blocked from an outside of said accommodating portion and an open position where the supply opening is open to the outside; anda movable portion, having first and second projected portions, for moving said shutter portion,wherein when said developer supply cartridge is mounted to the main assembly and said first projected portion engages with an engaging portion provided in a main assembly side, said first projected portion is moved so that said shutter portion is moved from said closed position to said open position, andwherein, if said second projected portion engages with the engaging portion, said second projected portion slides while contacting the engaging portion so that said movable portion performs a preventing operation for preventing movement thereof. 18. A developer supply cartridge according to claim 1, wherein said movable portion includes first and second projected portions. 19. A developer supply cartridge according to claim 13, wherein said movable portion includes first and second projected portions. 20. A developer supply cartridge according to claim 18, wherein said movable portion includes first and second projected portions. 21. A developer supply cartridge according to claim 19, wherein said second projected portion includes a tapered portion. 22. A developer supply cartridge according to claim 17, wherein said second projected portion includes a tapered portion. 23. A developer supply cartridge according to claim 18, wherein said second projected portion includes a tapered portion. 24. A developer supply cartridge according to claim 19, wherein said second projected portion slides while contacting the engaging portion.