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.

Embodiments of the present invention provide improvements to printers including the use of engineered structures to limit bending, flexing, and/or twisting during impacts and the use of impact absorbing materials to prevent cracks and breaks. Design features and materials add to the rigidity of the printer design to prevent twisting and flexing during impacts and add to the strength of the printer design in typical breakage areas. For example, embodiments provide improvements that strengthen traditional break areas by the use of improved materials and design optimization to distribute impact forces. Embodiments allow the printer to maintain an operational status following a drop test and/or a tumble test.

A liquid ejecting device that includes a main body at which a liquid ejecting unit is mounted, a liquid supply device configured to be movable independently of the main body and supply liquid to the liquid ejecting unit, a main body side engaging portion configured to engage with the liquid supply device, and a liquid supply device side engaging portion configured to engage with the main body, wherein one of the main body side engaging portion and the liquid supply device side engaging portion includes an insertion portion formed of a conductive member and movable in a vertical direction, another includes an accommodating portion for accommodating the insertion portion, and the accommodating portion is provided with a contact member formed of a conductive member, and configured to accommodate the insertion portion in a state in which the contact member and the insertion portion are in contact with each other.

A liquid ejecting device that includes a main body at which a liquid ejecting unit is mounted, a liquid supply device configured to be movable independently of the main body and supply liquid to the liquid ejecting unit, a main body side engaging portion configured to engage with the liquid supply device, and a liquid supply device side engaging portion configured to engage with the main body, wherein one of the main body side engaging portion and the liquid supply device side engaging portion includes an insertion portion formed of a conductive member and movable in a vertical direction, another includes an accommodating portion for accommodating the insertion portion, and the accommodating portion is provided with a contact member formed of a conductive member, and configured to accommodate the insertion portion in a state in which the contact member and the insertion portion are in contact with each other.

A liquid ejection device is a liquid ejection device being coupled to a mounting unit on which a liquid accommodation body configured to accommodate a liquid is mounted, the liquid ejection device including an ejection unit configured to eject the liquid, a device flow path extending from the ejection unit, and a reception unit configured to receive the liquid, wherein the device flow path includes a coupling unit to be coupled to the mounting unit, and the reception unit is positioned vertically below the coupling unit.

A liquid ejection device is a liquid ejection device being coupled to a mounting unit on which a liquid accommodation body configured to accommodate a liquid is mounted, the liquid ejection device including an ejection unit configured to eject the liquid, a device flow path extending from the ejection unit, and a reception unit configured to receive the liquid, wherein the device flow path includes a coupling unit to be coupled to the mounting unit, and the reception unit is positioned vertically below the coupling unit.

A sheet drying apparatus includes a conveyance portion, a drying portion, a main body frame accommodating the conveyance portion and the drying portion, an exterior cover attached to the main body frame, an inner cover, a locking mechanism, a temperature sensor, and a control portion. The drying portion is arranged opposite the conveyance portion and heats and dries a sheet on which an image has been formed with ink containing moisture. The inner cover can be opened and closed between the exterior cover and the drying portion. The locking mechanism locks the inner cover in a closed state. The temperature sensor senses the temperature in the drying portion. The control portion makes the locking mechanism lock the inner cover in the closed state until the temperature in the drying portion sensed by the temperature sensor falls below a first temperature.

An example image forming apparatus includes a sensor to sense an opening or a closing of a component to access a consumable in the image forming apparatus, a processor, and a memory to store instructions that may be executed by the processor. By executing the instructions, the processor is to confirm an opening/closing history of the component based on a signal sensed by the sensor, as a preset event occurs in the image forming apparatus, and skip performance of an authentication operation on the consumable in a case where the opening/closing history of the component is not detected.

An example image forming apparatus includes a sensor to sense an opening or a closing of a component to access a consumable in the image forming apparatus, a processor, and a memory to store instructions that may be executed by the processor. By executing the instructions, the processor is to confirm an opening/closing history of the component based on a signal sensed by the sensor, as a preset event occurs in the image forming apparatus, and skip performance of an authentication operation on the consumable in a case where the opening/closing history of the component is not detected.