Carpet seaming apparatus

Details Carpet seaming apparatus Carpet seaming apparatus

G - Physics

05

F

309/1, 327/1

G05F 1/40 (2006.01) B29C 65/34 (2006.01) H02M 5/44 (2006.01) H05B 3/56 (2006.01) H02M 7/48 (2006.01)

Patent

CA 1221742

ABSTRACT Apparatus for controlling the current flow through metal foil heating elements in carpet joining tape comprises an oscillator which produces a high frequency output to drive a power amplifier so that the output voltage to be applied to the heating element is at a frequency proportional to or the same as the oscillator frequency. The output current (Rms value) is controlled by controlling the pulse width using a pulse width modulator which either increases or reduces the output pulse width in accordance with a comparison of the sensed output current against a reference derived from a control circuit. The reference voltage is dependent on the operating mode of the apparatus selected by switches or switch and counter.

462721

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