Recorder having pen arm drive members

Claim 2

A recording meter of the type having a drive mechanism, including a servomotor, for converting input of data into rotation of a drive pulley, comprising: a pen arm disposed to pivot on a rotating shaft and equipped with a recording element at its movable end; means for feeding a recording chart relative to the recording element under the pen arm in the direction from the rotating shaft to the movable end of the recording pen arm, the recording chart having a measuring scale disposed across the chart feed direction; idler guide pulley means; and two pen arm driving members, one of which is stretchable and the other of which is nonstretchable, each having one end fastened to the drive pulley rotated by the servomotor after being wound on the outer circumference of the movable end of said pen arm by said idler pulley means, for driving said pen arm, from both sides with said driving members, wherein the nonstretchable driving member is wound or unwound on the drive pulley by the servomotor to cause the stretchable driving member to follow the movement of the nonstretchable driving member and wherein the pen arm is thus deflected in proportion to the rotating angle of the servomotor.

Claim 3

The recording meter as claimed in claim 1 wherein one of said driving members is a steel band; and the other of said driving members is a stranded band associated with resilient means in the form of a coil spring.

Claim 4

A recording meter as claimed in claim 1 wherein one of said driving members is a metal band and wherein said recording meter further comprises: a driving member attachment means mounted on said recording element, said attachment means being partly arc-shaped, said metal band being fastened to said attachment means to diverge tangentially from the arc-shaped portion thereof whereby the point of mutual attachment never coincides with the point of tangency.

Claim 5

A recording meter as claimed in claim 1 wherein said recording element and said pen arm are relatively rotatably coupled to each other, and wherein an adjustment member having an eccentric stud is associated with said recording element and said pen arm to rotatably change the position of said recording element relative to said pen arm in order to effect adjustment of said recording element.

Claim 6

A recording meter of the type having a drive mechanism, including a servomotor, for converting input of data into rotation of a drive pulley comprising: a pen arm disposed to pivot on a rotating shaft and equipped with a recording element at its movable end; means for feeding a recording chart fed relative to the recording element under the pen arm in the direction from the rotating shaft to the movable end of the recording pen arm, the recording chart having a measuring scale with uniform graduation in the direction perpendicular to the chart feed direction; idler pulley means, and two driving members, one of which is nonstretchable, attached to said pen arm on the side of full-scale deflection and the other of said driving members which is stretchable and attached to the side of said pen arm opposite said nonstretchable driving member, each of said driving members having one end fastened to the drive pulley rotated by the servomotor after being wound on the outer circumference of the drive pulley in opposite directions and each of said driving members having the other end guided to opposite sides of the movable end of said pen arm by said idler pulley means for driving said pen arm from both sides with said drive members, wherein the scale error resulting from the relationship between the measuring scale and the pen arm deflection angle is substantially compensated for by the drive error resulting from the relationship between the displacement of the nonstretchable driving member and the pen arm deflection angle.

Claim 7

A recording meter of the type having a drive mechanism, including a servomotor, for converting input of data into rotation of a drive pulley comprising: a pen arm disposed to pivot on a rotating shaft and equipped with a recording element at its movable end; means for feeding a recording chart fed relative to the recording element under the pen arm in the direction from the rotating shaft to the movable end of the recording pen arm, the recording chart having a measuring scale with uniform graduation in the direction perpendicular to the chart feed direction; idler pulley means, and two driving members, one of which is nonstretchable, attached to said pen arm on the side of full-scale deflection and the other of said driving members which is stretchable and attached to the side of said pen arm opposite said nonstretchable driving member, each of said driving members having one end fastened to the drive pulley rotated by the servomotor after being wound on the outer circumference of the drive pulley in opposite directions and each of said driving members having the other end guided to opposite sides of the movable end of said pen arm by said idler pulley means for driving said pen arm from both sides with said drive members, wherein the scale error resulting from the relationship between the measuring scale and the pen arm deflection angle is substantially compensated for by the drive error resulting from the relationship between the displacement of the nonstretchable driving member and the pen arm deflection angle.

Claim 8

A recording meter as claimed in claim 5 wherein the relationship, 2L1 L2, is established where L1 and L2 equal respectively the displacements made by the nonstretchable driving member when the pen arm is deflected from zero- to one half-scale and from zero- to the full-scale.

Claim 9

A recording meter for recording data on a chart and adapted to dampen the effects of external vibration and shock, comprising: a pen arm having first and second ends; means pivotally mounting said pen arm at said first end for deflection through an angle; a recording element mounted at said pen arm second end; means for feeding the recording chart under said recording element; pen arm driving member means including flexible extensible and flexible inextensible driving members for driving said pen arm, said extensible driving member being coupled to said pen arm opposite said inextensible driving member at said second pen arm end, each of said driving members being arranged to follow said pen arm when pulled through an angle of pivoted deflection by the other of said drive members; drive means having a drive pulley to which said extensible and said inextensible driving members are both connected for unwinding one driving member while winding the other driving member, said drive means being adapted to convert input of data into rotation of said drive pulley; and idler pulley means for guiding said extensible and said inextensible driving members respectively from said drive means to opposite sides of said pen arm; said drive means, said idler pulley means and said driving member means cooperating to convert rotational movement of said drive pulley into angular deflection of said pen arm.

Claim 10

A recording meter for recording data on a chart and adapted to dampen the effects of external vibration and shock, comprising: a pen arm having first and second ends; means pivotally mounting said pen arm at said first end for deflection through an angle; a recording element mounted at said pen arm second end; means for feeding the recording chart under said recording element; pen arm driving member means including flexible extensible and flexible inextensible driving members for driving said pen arm, said extensible driving member being coupled to said pen arm opposite said inextensible driving member at said second pen arm end, each of said driving members being arranged to follow said pen arm when pulled through an angle of pivoted deflection by the other of said drive members; drive means having a drive pulley to which said extensible and said inextensible driving members are both connected for unwinding one driving member while winding the other driving member, said drive means being adapted to convert input of data into rotation of said drive pulley; and idler pulley means for guiding said extensible and said inextensible driving members respectively from said drive means to opposite sides of said pen arm; said drive means, said idler pulley means and said driving member means cooperating to convert rotational movement of said drive pulley into angular deflection of said pen arm.

Claim 11

The recording meter for recording observable data on a chart as claimed in claim 7, wherein: said inextensible driving member is a metal band; and said extensible driving member is a metal cable associated with a resilient, extensible member in the form of a coil spring.

Claim 12

The recording meter for recording observable data on a chart as claimed in claim 7 wherein: said recording arm is equipped with an inextensible driving member attachment means, said attachment means being arc-shaped, and said inextensible driving member being fastened to said attachment means to diverge tangentially therefrom, whereby the point of mutual attachment never coincides with the point of tangency.

Claim 13

The recording meter for recording observable data on a chart as claimed in claim 7 wherein: said pen arm is equipped with adjustment means for adjusting said recording element, said adjustment means comprising: a recording element frame mounted on said pen arm; a rotatable member coupled to said frame by a fulcrum stud, said inextensible driving member being connected to said rotatable member; means for selectively variably rotating said rotatable member with respect to said frame to change and adjust the effective length of said inextensible driving member; and lock means for relatively securing said rotatable member and said frame when adjustment is complete.

Claim 14

The recording meter for recording observable data on a chart as claimed in claim 7 wherein: said drive means, said idle pulley means and said driving member means are arranged for effecting one-half scale deflection of said pen arm when a given linear displacement of said inextensibe driving member is effected and for effecting full-scale deflection of said pen arm when twice that given linear inextensibLe driving member displacement is effected, thereby compensating the linear scale error with the pen arm drive error.