| 摘要 |
A recorder of the type for recording one or more records of the value of one or more conditions under measurement such as temperature, pressure, flow or the like upon a strip chart. A pen, pens, a stylus, stylii, or a printwheel in the case of multipoint recorders, is utilized to make a record of a condition or conditions on the chart; the recording element being moved across the chart to a position corresponding to the value of a condition. The chart is generally driven at a constant speed by means of a chart drive roll having a plurality of radially extending pins also referred to as sprocket teeth. In some instances in place of the drive roll there is a back-up plate having one or more sprocket wheels suitably displaced with respect to perforations in a chart. Such charts include adjacent at least one edge thereof a row of holes in a marginal area of the chart whereby driving engagement between the chart and the teeth or pins of the driving means cooperate to draw the chart from a supply roll passed the record applying means. The chart is thereafter drawn across a chart back-up plate by a reroll mechanism. In recorders of this type the reroll mechanism is driven slightly faster than the chart drive means either by utilizing a single motor and a chain or belt type of connection or by a separate motor. In the preferred form of applicants' invention the reroll is driven intermittently in a manner to prevent the holes in the chart from creeping off the pins of the drive means and/or jamming and/or tearing of the chart. Additionally, the intermittent reroll action permits edge guiding of the rerolled chart by the reroll flange to be fully effective.
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