Abstract 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.
Inventors
👤 T Highley
👤 A Paschkis
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-06 17:06
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A strip chart recorder having a chart, a chart supply station, means to draw the chart from the supply station, marking means for the application of a record to the chart, and chart reroll means including a reroll guide for rerolling the chart after application of a record thereto, the improvement comprising, a motor for actuation of said chart reroll means with the speed of said motor being adequate normally to maintain tension in the chart between said means to draw the chart from the supply station and said chart reroll means, and means cyclically to interrupt rotation of said motor and actuation of said chart reroll means periodically to relieve the tension in said chart between said reroll means and said means to draw the chart from the supply station thereby to prevent the chart from becoming disengaged from the means to draw the chart from said supply station, and permit edge guiding of the rerolled chart by said reroll guide to be fully effective.
Claim 2
Dependent Claim
166 words
A strip chart recorder having a chart, a chart supply station, means to draw the chart from the supply station, marking means for the application of a record to the chart, and chart reroll means including a reroll guide for rerolling the chart after application of a record thereto, the improvement comprising, a motor for actuation of said chart reroll means with the speed of said motor being adequate normally to maintain tension in the chart between said means to draw the chart from the supply station and said chart reroll means, and means cyclically to interrupt rotation of said motor and actuation of said chart reroll means periodically to relieve the tension in said chart between said reroll means and said means to draw the chart from the supply station thereby to prevent the chart from becoming disengaged from the means to draw the chart from said supply station, and permit edge guiding of the rerolled chart by said reroll guide to be fully effective.
Claim 3
Dependent Claim
65 words
A recorder according to claim 1 wherein said means cyclically to interrupt rotation of said motor and actuation of said chart reroll means comprises a detour bar supported by a spring, said detour bar spanning the width of said chart and supporting it at an angle so that the frictional forces pulling said detour bar downwardly increase by an amount sufficient to stall said motor.
Claim 4
Dependent Claim
74 words
A recorder according to claim 1 wherein said means cyclically to interrupt rotation of said motor and actuation of said chart reroll means comprises an edge of a chart back-up plate over which said chart is drawn prior to reception of said chart by said reroll means, said edge having a coating of friction material to retard passage of the chart upon application of tension thereto with a force sufficient to stall said motor.
Claim 5
Dependent Claim
86 words
A recorder according to claim 1 including a half-wave unfiltered power supply energizable from an A.C. source and wherein said motor is a D.C. motor intermittently energized by cyclically produced D.C. pulses from said power supply thereby to effect intermittent rotation of said chart reroll means for cyclic relief of tension between said reroll means and said means to draw the chart from the supply upon continued operation of said means to draw the chart from the supply station when said chart reroll means is stopped.