POST-PROCESSING DEVICE AND IMAGE FORMING SYSTEM

• Main Authors: KADOTA NORIYUKI, ENDO TAKAHIRO, NAKAHARA YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 14.09.2022
• Subjects: CONVEYING; CUTTING; CUTTING-OUT; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING,CUTTING-OUT, STAMPING-OUT OR SEVERING; HAND CUTTING TOOLS; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; PACKING; PERFORATING; PERFORMING OPERATIONS; PUNCHING; SEVERING; SEVERING BY MEANS OTHER THAN CUTTING; STAMPING-OUT; STORING; TRANSPORTING

To punch a sheet at a prescribed position regardless of a deviation of a diameter of a conveyance roller in a post-processing device provided with punching means for punching the currently conveyed sheet.SOLUTION: A period sensor for detecting a rotation period of an upstream roller is provided. A post-processing control unit adjusts a rotational speed ((iii) timings t4, t11, t12, etc.) of a conveyance motor so as to roughly match the peripheral speed of the upstream roller with the speed component of a punch unit at a punching position in a tangential direction on the basis of the rotation period ((i) rounded numerals 1-4, etc.) of the upstream roller detected by the period sensor.SELECTED DRAWING: Figure 5 【課題】搬送されているシートに穿孔する穿孔手段を備えた後処理装置において、搬送ローラの径のずれによらずシートの所定位置に穿孔すること。【解決手段】上流ローラの回転周期を検知する周期センサを備え、後処理制御部は、周期センサにより検知した上流ローラの回転周期（（ｉ）の丸数字１～丸数字４等）に基づいて、上流ローラの周速度とパンチユニットの穿孔位置における接線方向の速度成分とが略一致するように、搬送用モータの回転速度の調整を行う（（ｉｉｉ）のタイミングｔ４、ｔ１１、ｔ１２等）。【選択図】図５