US 2011/0236111 A1Published application

Image forming system, image forming apparatus, transportation amount adjusting method and computer readable medium

AssigneeFuji Xerox Co., Ltd.

InventorDaisuke FUJII

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Abstract

An image forming system includes: first and second image forming units that respectively form images on first and second surfaces of a recording medium formed into a belt shape while transporting the recording medium spanning the first and second image forming units; first and second transportation controllers that control a pre-transportation operation performed from a transportation start of the recording medium to arrival at a predetermined transportation speed, and a post-transportation operation including return transportation of the recording medium to an upstream side in a transporting direction performed from a start of a transportation stop to a stop of the recording medium; and a recording medium amount setting unit that adjusts transportation amounts of the recording medium in the pre-transportation and post-transportation operations, and thereby sets a recording medium amount existing between the first and second image forming units to a predetermined recording medium amount after the transportation stop.

Claims13

Dependent claims

An image forming system comprising:

a first image forming unit that forms an image on a first surface of a recording medium formed into a belt shape;
a second image forming unit that is arranged on a downstream side with respect to the first image forming unit in a transporting direction of the recording medium, and that forms an image on a second surface of the recording medium while transporting the recording medium spanning the first image forming unit and the second image forming unit;
a first transportation controller that controls a transportation operation of the recording medium including a pre-transportation operation and a post-transportation operation in the first image forming unit, the pre-transportation operation being performed from a transportation start of the recording medium to a time point after arrival at a predetermined transportation speed, the post-transportation operation including return transportation of the recording medium to an upstream side in the transporting direction performed from a start of a transportation stop to a stop of the recording medium;
a second transportation controller that controls a transportation operation of the recording medium including a pre-transportation operation and a post-transportation operation in the second image forming unit, the pre-transportation operation being performed from a transportation start of the recording medium to a time point after arrival at a predetermined transportation speed, the post-transportation operation including return transportation of the recording medium to the upstream side in the transporting direction performed from a start of a transportation stop to a stop of the recording medium;
and
a recording medium amount setting unit that adjusts at least any one of a transportation amount of the recording medium in the pre-transportation operation and the post-transportation operation controlled by the first transportation controller and a transportation amount of the recording medium in the pre-transportation operation and the post-transportation operation controlled by the second transportation controller, and thereby sets a recording medium amount to a predetermined recording medium amount after the transportation stop of the recording medium, the recording medium amount being set to exist between the first image forming unit and the second image forming unit.

3 more elements

An image forming apparatus comprising:

a transportation unit that transports a recording medium formed into a belt shape, the recording medium spanning the image forming apparatus and a second image forming apparatus forming an image on one surface of the recording medium, the second image forming apparatus performing a transportation operation including a pre-transportation operation and a post-transportation operation, the pre-transportation operation being performed from a transportation start of the recording medium to a time point after arrival at a predetermined transportation speed, the post-transportation operation including return transportation of the recording medium to an upstream side in a transporting direction performed from a start of a transportation stop to a stop of the recording medium;
an image forming function unit that forms an image on the other surface of the recording medium transported by the transportation unit;
and
a transportation controller that controls a transportation operation of the recording medium including a pre-transportation operation and a post-transportation operation, the pre-transportation operation being performed from a transportation start of the recording medium by the transportation unit to a time point after arrival at a predetermined transportation speed, the post-transportation operation including return transportation of the recording medium to the upstream side in the transporting direction performed from a start of a transportation stop to a stop of the recording medium, wherein
the transportation controller adjusts at least any one of a transportation amount of the recording medium in the pre-transportation operation and the post-transportation operation in the second image forming apparatus and a transportation amount of the recording medium in the pre-transportation operation and the post-transportation operation in the image forming apparatus, and thereby sets a recording medium amount to a predetermined recording medium amount after the transportation stop of the recording medium, the recording medium amount being set to exist between the second image forming apparatus and the image forming apparatus.

2 more elements

A transportation amount adjusting method comprising:

controlling a transportation operation, of a recording medium formed into a belt shape, including a pre-transportation operation and a post-transportation operation in at least any one of a first image forming apparatus and a second image forming apparatus, the first image forming apparatus forming an image on a first surface of the recording medium, the second image forming apparatus forming an image on a second surface of the recording medium on a downstream side with respect to the first image forming apparatus in a transporting direction of the recording medium while transporting the recording medium spanning the first image forming apparatus and the second image forming apparatus, the pre-transportation operation being performed from a transportation start of the recording medium to a time point after arrival at a predetermined transportation speed, the post-transportation operation including return transportation of the recording medium to an upstream side in the transporting direction performed from a start of a transportation stop to a stop of the recording medium;
adjusting a transportation amount of the recording medium in the post-transportation operation to the upstream side in the transporting direction in at least any one of the first image forming apparatus and the second image forming apparatus, so that a recording medium amount to be set to exist between the first image forming apparatus and the second image forming apparatus is set to a predetermined recording medium amount;
and
adjusting a transportation amount of the recording medium in the pre-transportation operation to the downstream side in the transporting direction in at least any one of the first image forming apparatus and the second image forming apparatus, so as to coincide with the transportation amount of the recording medium in the post-transportation operation to the upstream side in the transporting direction.

1 more element

A non-transitory computer readable medium storing a program that causes a computer to execute a process for adjusting a transportation amount, the process comprising:

controlling a transportation operation, of a recording medium formed into a belt shape, including a pre-transportation operation and a post-transportation operation in at least any one of a first image forming apparatus and a second image forming apparatus, the first image forming apparatus forming an image on a first surface of the recording medium, the second image forming apparatus forming an image on a second surface of the recording medium on a downstream side with respect to the first image forming apparatus in a transporting direction of the recording medium while transporting the recording medium spanning the first image forming apparatus and the second image forming apparatus, the pre-transportation operation being performed from a transportation start of the recording medium to a time point after arrival at a predetermined transportation speed, the post-transportation operation including return transportation of the recording medium to an upstream side in the transporting direction performed from a start of a transportation stop to a stop of the recording medium;
adjusting a transportation amount of the recording medium in the post-transportation operation to the upstream side in the transporting direction in at least any one of the first image forming apparatus and the second image forming apparatus, so that a recording medium amount to be set to exist between the first image forming apparatus and the second image forming apparatus is set to a predetermined recording medium amount;
and
adjusting a transportation amount of the recording medium in the pre-transportation operation to the downstream side in the transporting direction in at least any one of the first image forming apparatus and the second image forming apparatus, so as to coincide with the transportation amount of the recording medium in the post-transportation operation to the upstream side in the transporting direction.

1 more element

Dependencies are inferred from the claim text.