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    • 8. 发明授权
    • Vacuum drums for printing, and duplex printers
    • 用于打印的真空鼓和双面打印机
    • US06682191B2
    • 2004-01-27
    • US10219230
    • 2002-08-15
    • Stephen TempleKeith P. ButlerHoward J. ManningMichael J. Dixon
    • Stephen TempleKeith P. ButlerHoward J. ManningMichael J. Dixon
    • B41J201
    • B41J13/226B65H5/226B65H2406/332B65H2406/3632B65H2406/41
    • A vacuum drum assembly for a printing machine has a drum with an array of passageways distributed along its length and around its periphery. The passageways permit air to flow from outside the drum to inside the drum in response to reduced air pressure inside the drum. The assembly also has an array of valve members, each valve member being movable between a closed position in which that valve member restricts at least one of the passageways and an open position in which the restriction of that passageway or those passageways is reduced. The assembly is arranged such that, when a partial area of the drum is wrapped with a sheet of material, at least some of the valves for the passageways adjacent the edges of that area are open, and the valves for the passageways which are not covered by the sheet and are not adjacent the edges of that area are closed.
    • 用于印刷机的真空鼓组件具有沿着其长度并围绕其周边分布的通道阵列的滚筒。 通道响应于滚筒内的减小的空气压力,允许空气从鼓外部流动到滚筒内部。 组件还具有阀构件阵列,每个阀构件可在关闭位置之间移动,在该关闭位置中,该阀构件限制通道中的至少一个和限制该通道或那些通道的打开位置。 组件布置成使得当滚筒的部分区域被一片材料包裹时,用于与该区域的边缘相邻的通道的至少一些阀是打开的,并且用于未被覆盖的通道的阀 通过片材并且不邻近该区域的边缘被关闭。