US 3,938,437 AGranted

Variable speed unwind controller drum

AssigneeHarris-Intertype Corporation

InventorDinesh Gulabrai Punater

Life of this patent

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Abstract

The unwind controller drum for metering web material into a web processing machine is positively driven by a positive, fixed-ratio drive train. Several drive ratios are selectively available, each differing only slightly from another to provide minute changes in the drive ratio from the drive to the unwind drum. The changes in drive speed are generally less than .05% to provide positively determined, finite adjustment of the rate that the web material is metered into the web processing equipment.

Claims12

Dependent claims

In a web infeed system for a rotary printing press having

a printing couple including a pair of cylinders adapted to print the web under pressure and drive the web through a nip formed by said cylinders,
drive means for driving said printing couple,
a web supply roll,
means supporting said supply roll for paying out the web on demand related to the requirements of said printing couple, and
a metering drum intermediate said web supply and said printing couple for unwinding the web from said supply and feeding it to said nip,
the improvement comprising:
drive train means connected to said metering drum with direct gearing from said printing couple drive means at independently selectable different speeds the outputs of which differ in relation to the input speed from said drive means generally within .05% of one another, said drive train means including:
a. an imput drive gear driven by said drive means,
b. a metering drum drive gear connected to rotate said metering drum,
c. one of said input and metering drum drive gears being a first drive gear and the other being a second drive gear,
d. a first idler set having at least two gears and being mounted adjacent said first drive gear with a first gear of said first idler set meshed with said first drive gear,
e. a second idler set having at least two gears and being mounted with a first gear thereof meshed with a second gear of said first idler set,
f. a third idler set having at least two gears and being mounted with a first gear thereof meshed with said second gear of said first idler set, said third idler set being free of driving contact with said second idler set,
g. means mounting said second drive gear adjacent the second gears of said second and third idler sets,
h. means for alternatively meshing said second drive gear with one or the other of the second gears of said second and third idler sets, and
i. one of said first and second idler sets providing a speed increasing ratio and the other a speed decreasing ratio to provide a net speed change which is the product of their ratios and is an increase or decrease of generally less than 0.5%.

13 more elements

Dependencies are inferred from the claim text.

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Abstract

In a web infeed system for a rotary printing press having

a printing couple including a pair of cylinders adapted to print the web under pressure and drive the web through a nip formed by said cylinders,
drive means for driving said printing couple,
a web supply roll,
means supporting said supply roll for paying out the web on demand related to the requirements of said printing couple, and
a metering drum intermediate said web supply and said printing couple for unwinding the web from said supply and feeding it to said nip,
the improvement comprising:
drive train means connected to said metering drum with direct gearing from said printing couple drive means at independently selectable different speeds the outputs of which differ in relation to the input speed from said drive means generally within .05% of one another, said drive train means including:
a. an imput drive gear driven by said drive means,
b. a metering drum drive gear connected to rotate said metering drum,
c. one of said input and metering drum drive gears being a first drive gear and the other being a second drive gear,
d. a first idler set having at least two gears and being mounted adjacent said first drive gear with a first gear of said first idler set meshed with said first drive gear,
e. a second idler set having at least two gears and being mounted with a first gear thereof meshed with a second gear of said first idler set,
f. a third idler set having at least two gears and being mounted with a first gear thereof meshed with said second gear of said first idler set, said third idler set being free of driving contact with said second idler set,
g. means mounting said second drive gear adjacent the second gears of said second and third idler sets,
h. means for alternatively meshing said second drive gear with one or the other of the second gears of said second and third idler sets, and
i. one of said first and second idler sets providing a speed increasing ratio and the other a speed decreasing ratio to provide a net speed change which is the product of their ratios and is an increase or decrease of generally less than 0.5%.

13 more elements