Abstract: Computer-implemented systems and methods for dynamically managing printing service from a multi-display device are disclosed to include a first and second software interface and at least one printer. The processors are instructed to establish and maintain a printing task queue storing printing tasks for each of the at least one printer, receive a printing task from the first software interface associated with a first timestamp, determine a printer for the printing task, disable write access to the printing task queue of the printer from the second software interface, add the first printing task to the printing task queue of the printer; re-enabling the write access to the printing task queue of the printer from the second software interface, and printing a current printing task from the printer, the current printing task is a printing task in the printing task queue of the printer with an earliest timestamp.

Abstract: Computer-implemented systems and methods for dynamically controlling a multi-display device such as a point-of-sale (POS) device are disclosed and may be configured to receive a first input; in response to receiving the first input, enable a first input mode by replacing one or more first input elements with one or more second input elements for display on at least one of a first touch display or a second touch display; receive a second input associated with at least one of the first touch display or the second touch display; determine whether the first input mode is enabled; and based on determining whether the first input mode is enabled, deny the second input.

Abstract: The present application provides a cover body mechanism, wherein the cover body mechanism comprises a first cover body, a handle, a second cover body, a connecting base and a sealing ring, wherein a bottom of the first cover body is provided with a groove; wherein the connecting end is movably accommodated in the groove through the second channel opening and connected with the groove through a second rotating shaft; wherein the connecting ring is sleeved with an upper side of the second cover body, an upper end of the connecting arm is movably accommodated in the groove through the first channel opening and is connected with the connecting end through a first rotating shaft; wherein the sealing ring is capable of deforming outward and expanding with the rise of the second cover body, so as to be sealingly contact to an inner side wall of a storage cavity in the sealed tank body.