An image forming apparatus includes a discharge rollers pair, a sheet pressing member and a discharge tray. The sheet pressing member includes a first rotational shaft, a detection piece and a corrugation piece. The corrugation piece protrudes in a radial direction different from a protruding direction of the detection piece from the first rotational shaft. When the detection piece is turned at a first angle into a first posture, the corrugation piece is changed into a contact posture where the corrugation piece comes into contact with the sheet to apply stiffness on the sheet. When the detection piece is turned at a second angle into a second posture, the corrugation piece is changed into a retracting posture where the corrugation piece separates from the sheet.

An image forming apparatus includes a discharge rollers pair, a sheet pressing member and a discharge tray. The sheet pressing member includes a first rotational shaft, a detection piece and a corrugation piece. The corrugation piece protrudes in a radial direction different from a protruding direction of the detection piece from the first rotational shaft. When the detection piece is turned at a first angle into a first posture, the corrugation piece is changed into a contact posture where the corrugation piece comes into contact with the sheet to apply stiffness on the sheet. When the detection piece is turned at a second angle into a second posture, the corrugation piece is changed into a retracting posture where the corrugation piece separates from the sheet.

A printing device, a printing machine, and a box making machine are provided with printing cylinders on which printing plates can be mounted, ink supply rolls that are placed on the upstream or downstream sides of the printing cylinders in a sheet-conveying direction and that can be in contact with the printing cylinders, ink supply units that can supply ink to the ink supply rolls, first covers that cover the upper parts of the printing cylinders in the vertical direction and that can be opened and closed, and footholds that cover the vertically upper parts of the ink supply rolls and that can be operated by an operator.

A printing device, a printing machine, and a box making machine are provided with printing cylinders on which printing plates can be mounted, ink supply rolls that are placed on the upstream or downstream sides of the printing cylinders in a sheet-conveying direction and that can be in contact with the printing cylinders, ink supply units that can supply ink to the ink supply rolls, first covers that cover the upper parts of the printing cylinders in the vertical direction and that can be opened and closed, and footholds that cover the vertically upper parts of the ink supply rolls and that can be operated by an operator.

A medium transport device includes a roller transporting a medium, such as recording paper; a first layer covering a surface of the roller facing the medium; a second layer laminated on the first layer; and convex portions provided between the first layer and the second layer, and the convex portions are formed from inorganic particles. The first layer binds the convex portions to the roller, and the second layer covers the convex portions for protection.

A printing apparatus includes a transport unit including a roller that transports a recording sheet in a transport direction, a transport motor that rotates the roller, and a driving circuit that drives the transport motor, a head that performs printing on the recording sheet, a cutter that cuts the recording sheet, and a control unit. The control unit puts the transport motor into a hold state by the driving circuit when the recording sheet is cut by the cutter, and puts the transport motor into a short brake state by the driving circuit after the recording sheet is cut by the cutter.

A printing apparatus includes a transport unit including a roller that transports a recording sheet in a transport direction, a transport motor that rotates the roller, and a driving circuit that drives the transport motor, a head that performs printing on the recording sheet, a cutter that cuts the recording sheet, and a control unit. The control unit puts the transport motor into a hold state by the driving circuit when the recording sheet is cut by the cutter, and puts the transport motor into a short brake state by the driving circuit after the recording sheet is cut by the cutter.

A printing machine with a cold foil roller includes a printing plate roller, an ink roller set, a transfer roller, a material catching roller and a hollow roller inside a chassis. The hollow roller contains a wheel wall, a driving motor, an infeed wheel and an outfeed. The driving motor is connected to a control element, and the outfeed wheel has a cold foil with an end wound from a side inside the hollow roller to the outside and attached from an outer surface of the wheel wall to the other side inside the hollow roller and then fixed to the infeed wheel. The driving motor is provided for transmitting the infeed wheel to send/receive cold foil, and the driving motor rotates with the hollow roller asynchronously to avoid wasting the cold foil caused by the synchronous operation of the driving motor and the hollow roller.

A printing machine with a cold foil roller includes a printing plate roller, an ink roller set, a transfer roller, a material catching roller and a hollow roller inside a chassis. The hollow roller contains a wheel wall, a driving motor, an infeed wheel and an outfeed. The driving motor is connected to a control element, and the outfeed wheel has a cold foil with an end wound from a side inside the hollow roller to the outside and attached from an outer surface of the wheel wall to the other side inside the hollow roller and then fixed to the infeed wheel. The driving motor is provided for transmitting the infeed wheel to send/receive cold foil, and the driving motor rotates with the hollow roller asynchronously to avoid wasting the cold foil caused by the synchronous operation of the driving motor and the hollow roller.

A printing device, a printing machine, and a box making machine are provided with printing cylinders on which printing plates can be mounted, ink supply rolls that are placed on the upstream or downstream sides of the printing cylinders in a sheet-conveying direction and that can be in contact with the printing cylinders, ink supply units that can supply ink to the ink supply rolls, first covers that cover the upper parts of the printing cylinders in the vertical direction and that can be opened and closed, and footholds that cover the vertically upper parts of the ink supply rolls and that can be operated by an operator.