A process for initiating a premature roll change of a web to be unwound from a roll wound on a spool, the process including the steps of measuring temperature at an end of the roll in a zone up to 150 mm away from a surface of the spool in a radial direction during a time that the roll has between 100% and 60% of its fully wound weight, using a non-contact measuring device, determining a radial distance from the spool surface when a temperature difference.gtoreq.0.5.degree. C. is found between t...

A device for winding and unwinding a web of material and including two separated uprights, in each of which is mounted a horizontal chuck onto which the core tube can be introduced. To prevent the core tube from corrugating or tearing, there is a mechanism (15-17) that supports the reel (8) at the bottom during winding and unwinding and that can move along with the reel.

Press for cutting a material in the form of a sheet comprising a horizontal work-table, a moving bridge located above the worktable over the whole length of the latter and capable of sliding horizontally so as to either overhang the said table or free it by being moved aside therefrom, a press-plate supported by a carriage mounted under the said bridge and movable in horizontal translation in a direction perpendicular to the direction of displacement of the bridge itself, the said plate being mo...

Azeotropes are formed between 1,1-dichloroethane and 1,1,2-trichloro-1,2,2-trifluoroethane which boils at about 115.5.degree. F. at 760 mm. mercury pressure. The azeotrope is useful in solvent degreasing applications.

A photographic light-sensitive material, especially for the silver dyestuff bleaching process is provided, which contains on a support in at least one layer, at least one dyestuff of the formula ##SPC1## In which R.sub.1, R.sub.2, D and E are organic radicals, R.sub.1 and R.sub.2 being in the 3-, 4- or 5-positions to the --CO--group, K is an acyl radical and m, n and p each equals 1 or 2. These dyestuffs are resistant to diffusion, form stable aqueous solutions, can be easily bleached, are fast ...

The present invention provides a family of dark quenchers, termed Black Hole Quenchers ("BHQs"), that are efficient quenchers of excited state energy but which are themselves substantially non-fluorescent. Also provided are methods of using the BHQs, probes incorporating the BHQs and methods of using the probes.

Copper complex formazan compounds useful as dyestuffs and having fiber-reactive dyestuff properties, which are capable of providing fast, deep dyeings and prints on fiber materials, preferably of cellulose and polyamide fibers, have the following structural formula ##STR1## in which m and n are 1 or 2, A is a benzene ring or a naphthalene ring, either of which is necessarily substituted by the sulfo group in the ortho-position relative to the N-atom and which can optionally be further substitute...

A hoist limiting system (15) comprising a frame (16), a hoist drum (17) supported by the frame and rotatable about a hoist axis (x-x), a hoist driver (19) supported by the frame and configured to rotate the hoist drum in opposite upward (30) and downward (31) directions about the hoist axis, a hoist line (18) in engagement with the hoist drum such that the hoist line winds in the upward or downward direction in response to rotation of the hoist drum, at least one gear (20) mechanically coupling ...

An apparatus for signaling rotation of a winch in which a rotating gear internal in the winch turns an optical disc with alternating segments of distinguishing features. The disc is then in turn read by an optical sensor that can generate a pulsed output signal based on the travel of the alternating segments on the disc. The output signal of the optical sensor is then conditioned to drive a solenoid that is placed in a control lever of the winch. The optical disc and the optical sensor are part ...

A method and apparatus for indicating when only a given minimum preset number of winding layers are present on a drum of a winch. An optical sensor system is included in a space in a hollow housing to count the number of revolutions of the drum and the direction of rotation to produce an alarm signal when only the minimum number of winding layers remains on the drum.