Device for feeding constant pressure fluid

DETAILED DESCRIPTION An object of the present invention is to provide a device for feeding a fluid under substantially constant pressure to a utilization element such as ink jet printing head, wherein the fluid is supplied to the feeding device through a conduit from a fluid source.
According to a first aspect of the invention, the feeding device comprises a pair of first and second identical chambers respectively connected to first and second sections of the conduit, a connecting channel for connecting the first and second chambers, and a passageway through which the connecting channel is in communication with the utilization element, wherein the transverse cross section of the connecting channel is smaller than the transverse cross section of the first and second chambers.
Preferably, the transverse cross section of the connecting channel is equal to or smaller than 1/3 of the transverse cross section of the first and second chambers.
According to a second aspect of the invention, an arrangement for use in a nonimpact printer is provided which comprises a reciprocally movable nonimpact printer head for ejecting fluid to a writing surface in response to an electrical signal applied thereto, a flexible conduit having first and second sections one of which is connected to a source of fluid, and a device movable with the printing head and formed with a pair of first and second identical fluid chambers respectively connected to the first and second sections of the conduit, a connecting channel for connecting the first and second chambers fluidic communication therebetween, the transverse cross section of the connecting channel being smaller than the transverse cross section of the first and second chambers, and a passageway through which the fluid in the connecting channel is supplied to the printing head.