In accordance with an embodiment, a sheet processing apparatus, containing a controller that acquires a predetermined data associated with a physical quantity of one of a driving motor or a driven member driven by the motor based on a predetermined signal, compare the predetermined data with a threshold value, and determine whether to transmit a request for increasing a discharge interval of a sheet based on the comparative result.

In accordance with an embodiment, a post-processing apparatus comprises a memory that stores a threshold value and a first accumulated data of a physical quantity of one of a motor or a driven member driven by the motor; and a controller that acquires a predetermined data associated with a physical quantity of one of the driving motor or the driven member driven by the motor, acquires a second accumulated data by adding the predetermined data to the first accumulated data read from the memory, compares the second accumulated data with the threshold value, and transmits a request for increasing a discharge interval of the sheet if the second accumulated data is greater than the threshold value.

In a first punching mode, a control portion displaces a support member from a first-path-side end side to a second-path-side end side, and causes a first punching portion on the first-path-side end side to operate in a state where the support member has reached a first target position. In a second punching mode, the control portion displaces the support member from the second-path-side end side to the first-path-side end side, and causes a second punching portion on the second-path-side end side to operate in a state where the support member has reached a second target position. The first and second target positions are based on positions of the support member at points of time when edges on the first-path-side end side and the second-path-side end side are detected by the first sheet sensor and the second sheet sensor, respectively.

Printing and perforating machine comprising a perforating mechanism (1) and a printing mechanism (30), the perforating mechanism (1) comprising a perforating element (2, 7) provided with piercing elements (5); and a support element (4, 8) that defines with the perforating element (2, 7) a space for the passage of a sheet material (3), forming holes on the sheet material (3) when it passes through this space. With this machine, the perforation of the sheet material is carried out during the printing process thereof, preferably a digital printing, in a synchronized way, eliminating time and handling for loading and unloading the roll of sheet material in a conventional sheet material perforating machine.

A recording material post-processing device includes: a recording material receiving unit that receives a recording material on which an image is formed from an image forming apparatus, the apparatus including an image forming unit that forms an image on a recording material to be transported, and a detection unit that detects a position of the recording material, on which the image is to be formed by the image forming unit, in a direction intersecting a transport direction of the recording material; a post-processing unit that performs post processing on the recording material received via the recording material receiving unit from the image forming apparatus; and a moving unit that moves the post-processing unit in the direction intersecting the transport direction of the recording material based on information related to the position of the recording material detected by the detection unit of the image forming apparatus.

A punching device includes: a punching member opens a punch hole on a sheet material on a die plate by penetrating a die hole provided to the die plate; a discharging member discharges static electricity charged on a punching chip generated by opening of the punch hole when the punching chip is guided to fall on the discharging member arranged on a lower side of the die hole and brought into contact with the discharging member; and a pressing member that presses the punching chip on the discharging member against the discharging member.

A punching unit includes a punching blade, a holder, a biasing member, an eccentric cam, and a punching guide. The eccentric cam contacts the holder, and rotates against a biasing force of the biasing member to move the holder in a punching direction in which the punching blade approaches the sheet. The punching guide extends in a moving direction of the punching blade in which the punching blade moves with respect to the sheet, and guides movement of the punching blade. The eccentric cam, when moving the holder in the punching direction, passes by a side of the punching guide in a manner overlapping with the punching guide as seen from a rotation axis direction of the eccentric cam.

A punching station for arranging one or more penetration elements in or through an edge portion of a relief plate precursor or for arranging one or more perforations in the edge portion. The punching station includes a punching means comprising one or more penetration elements or perforating elements, the punching means configured for arranging the one or more penetration elements or perforating elements through or in an edge portion of the relief plate precursor. An abutment means is aligned with the punching means and configured for forming an abutment for the edge of the relief plate precursor. A detection means is configured to detect at two or more locations along the abutment means whether the edge portion of the relief plate precursor is correctly positioned against the abutment means. A signalling means is configured to communicate a signal in function of the detection by the detection means.

A punching station for arranging one or more penetration elements in or through an edge portion of a relief plate precursor or for arranging one or more perforations in the edge portion. The punching station includes a punching means comprising one or more penetration elements or perforating elements, the punching means configured for arranging the one or more penetration elements or perforating elements through or in an edge portion of the relief plate precursor. An abutment means is aligned with the punching means and configured for forming an abutment for the edge of the relief plate precursor. A detection means is configured to detect at two or more locations along the abutment means whether the edge portion of the relief plate precursor is correctly positioned against the abutment means. A signalling means is configured to communicate a signal in function of the detection by the detection means.