Patent ID: 11897279
Assignee: RICOH COMPANY, LTD.
Field: Other consumer goods (Other fields)
Classification: CPC B  G | IPC B  G

Claim 8:
9. An image forming system comprising:
an image forming apparatus configured to form an image on a medium; and
an envelope processing apparatus configured to enclose the medium sent from the image forming apparatus into an envelope conveyed to an enclosing position,
the envelope processing apparatus comprising,
a conveyance roller configured to convey the envelope to the enclosing position,
a first envelope length calculator configured to calculate a first envelope length of the envelope in an envelope conveyance direction in which the envelope is conveyed in a close state in which a flap of the envelope closes,
a flap opener configured to open the flap while the conveyance roller conveys the envelope,
a second envelope length calculator configured to calculate a second envelope length of the envelope in the envelope conveyance direction in an open state in which the flap opens,
a first envelope detector configured to detect a leading end of the envelope in the envelope conveyance direction at a first detection time and detect a trailing end of the envelope in the envelope conveyance direction in the close state at a second detection time,
a second envelope detector configured to detect the leading end of the envelope in the envelope conveyance direction at a third detection time and detect the trailing end of the envelope in the envelope conveyance direction in the open state at a fourth detection time,
the first envelope length calculator is further configured to calculate the first envelope length based on a time difference between the first detection time and the second detection time and a conveyance speed of the envelope at which the envelope is conveyed,
the second envelope length calculator is further configured to calculate the second envelope length based on a time difference between the third detection time and the fourth detection time and the conveyance speed of the envelope, and
a controller configured to,
calculate a flap length of the flap in the envelope conveyance direction based on the first envelope length and the second envelope length, and
control enclosing of the medium into the envelope based on the flap length.