公开(公告)号：US20110062652A1

公开(公告)日：2011-03-17

申请号：US12559934

申请日：2009-09-15

Applicant: ROBERT A. CLARK

Inventor： ROBERT A. CLARK

IPC: B65H3/14 ,  B65H7/14

CPC classification number: B65H3/128 ,  B65H7/16 ,  B65H2515/342 ,  B65H2801/06 ,  B65H2220/03

Abstract: This invention provides a simple vacuum level switch to be used inside the feedhead's vacuum plenum to detect when the vacuum level exceeds a predefined threshold. This switch is composed of an opening in the plenum that is covered by a cap which is in turn spring-loaded against the opening. The mechanical properties of the spring are such that the cap is pushed away from the opening by ambient air pressure at the point when the vacuum threshold has been reached during sheet acquisition. A Hall Effect or optical sensor is used to detect this motion and the corresponding signal is sent to the feeder controller. This enables more intelligent control of the feeder while also providing an inexpensive method for tracking sheet acquisition times.

Abstract translation: 本发明提供一种简单的真空液位开关，用于进料头的真空室内使用，以检测何时真空度超过预定阈值。 该开关由通气孔盖的开口组成，该开口被盖帽覆盖，该盖子又弹簧加载在开口上。 弹簧的机械性能使得在片材采集期间达到真空阈值的时刻，通过环境空气压力将盖子从开口推开。 使用霍尔效应或光学传感器来检测该运动，并将相应的信号发送到馈线控制器。 这使得能够更智能地控制馈线，同时还提供了用于跟踪片材采集时间的便宜方法。