US 4,360,938 AGranted

Machine for lasting heel seat portions of shoes

AssigneeUSM Corporation

InventorsBrian J. M. Murphy, Leslie A. Withers, Malcolm Salway-Waller

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Abstract

In tack seat lasting machines, variation of the tack (nail) pattern is achieved by varying the wiper inwiping movement, itself dependent upon their lengthwise movement. Such variation also alters the "back tack" position (i.e. relationship between the heel band backseam region and corresponding region of the wipers). In accordance with the invention, the nail pattern is varied by an operator-set reference potentiometer (198) by matching with its signal that of a linear potentiometer (190) which controls operation of wiper-operating motor (72, 74). The back tack position is controlled by a motor (105) according to an operator setting of a reference potentiometer (208). The combined signal from the reference potentiometers (198, 208) is compared with a control signal of a linear potentiometer (202) associated with the heel band, the motor (105) being operated until the compared signals match. Thus any variation of the nail pattern, by re-setting potentiometer (198), also causes motor (105) to operate to adjust the heel band position accordingly, thus maintaining the back tack position as set by the potentiometer (208).

Claims7

Dependent claims

A machine for lasting heel seat portions of shoes, comprising a shoe support for supporting, bottom uppermost, a shoe comprising an upper carried on a last and an insole held against the last bottom, a heel band for clampingly engaging the heel end of a shoe supported by the shoe support, a wiper assembly for causing lasting marginal portions of the upper, at the heel seat region thereof, to be wiped over and pressed against corresponding marginal portions of the insole--said assembly comprising two wiper plates, first drive means for effecting movement of the wiper plates relative to the shoe bottom in a direction extending lengthwise of the shoe bottom, and cam means for effecting inwiping movement of the wiper plates, as lengthwise movement thereof is effected as aforesaid--and fastener inserting means by which, while the lasting marginal portions of the upper are being pressed against corresponding marginal portions of the insole as aforesaid, fasteners can be driven, through apertures formed in the wiper plates, adjacent leading edge portions of each thereof, thus to secure said marginal portions together;

said machine also comprising second drive means for moving the heel band relative to the shoe support in a direction extending lengthwise of the shoe bottom, and control means by which the operator can set the position to which the wiper plates are moved by the first drive means (constituting a fastener inserting position), the arrangement being such that the setting by the operator of the fastener inserting position of the wiper plates is effective to cause the second drive means to operate in such a manner that the relationship between the backseam region of the heel band and a corresponding region of the wiper plates is retained.

Dependencies are inferred from the claim text.