Patent ID: 8535032
Filing Date: 2013-09-17
Classification: B29C

Abstract:
1. A film stretcher that transports a film material in a predetermined transport direction while holding an end of the film material in a width direction of the film material to stretch the film material in the width direction, comprising: a holding unit that includes a stretching roll having an annular groove formed on an outer periphery of the stretching roll and a holding wire material that is fitted in the annular groove over a predetermined rotation angle range of the annular groove in a circular arc shape so that the end of the film material in the width direction of the film material is pinched, wherein the stretching roll is inclined so as to open toward a downstream side in the transport direction of the film material; wherein the holding unit transports the film material in the transport direction while pinching the film material using the stretching roll and the holding wire material, whereby the film material is stretched in the width direction; wherein the holding wire material is an endless holding wire material that is wound around a plurality of transport rolls of which rotation axes are arranged along a concentric circle of the stretching roll at a predetermined angular interval; and wherein the plurality of transport rolls are arranged so that outer peripheral surfaces of the respective transport rolls face the annular groove with the end of the film material in the width direction of the film material interposed therebetween.