Medium processing apparatus and image forming system incorporating same

A medium processing apparatus comprising:

• a liquid applier including a liquid applier mover to move a liquid application member relative to a part of at least one medium of a bundle of media in one direction to cause the liquid application member to contact with or separate from the part of the at least one medium in a liquid application process,
• the liquid applier configured to:
• apply a liquid to a liquid application region in the part of the at least one medium;
• and
• apply the liquid to the liquid application region overlapped with at least a part of a post-processing region;
• a post-processing device configured to perform a given process on the post-processing region in the part of the at least one medium having the liquid application region on which the liquid is applied by the liquid applier;
• and
• circuitry configured to cause the liquid applier mover to change an amount of movement of the liquid application member to the part of the at least one medium in the one direction to adjust a size of the liquid application region formed on the part of the at least one medium.

A medium processing apparatus comprising:

• a liquid applier configured to apply a liquid to a liquid application region in a part of at least one medium of a bundle of media;
• and
• a post-processing device to perform a given process on a post-processing region in the part of the at least one medium having the liquid application region on which the liquid is applied by the liquid applier,
• wherein the liquid applier is configured to cause a liquid application member to contact a downstream part of the post-processing region in a turning direction of the at least one medium to form the liquid application region having a part overlapped with the downstream part of the post-processing region.