A product cutting method performs a cutting step of forming a product cutting line in a sheet material, and forming tongue piece portions, which are adjacent to an outer periphery of a product together with being connected to the sheet material, and are capable of being displaced with respect to the sheet material in a thickness direction of the sheet material by forming auxiliary cutting lines continuous with the product cutting line in end members of the sheet material, and an extracting step of taking out the product from the end members by applying a vacuum suction to an extracting device.

A device for releasing sections from a material web has a vacuum cutting cylinder and a counter cylinder for cutting the sections. The device also has a vacuum transfer roll for removing the sections from the vacuum cutting cylinder and a conveyor belt, onto which the sections are capable of being deposited from the vacuum transfer roll.

Embodiments relate to a jelly roll winding unit (1) and winding method for a secondary battery and, more particularly, to a jelly roll winding unit (1) and winding method for a secondary battery seeking to prevent sagging in the width direction by constantly supporting the bottom of a jelly roll (J) during the work of wrapping the jelly roll (J) with a separator (B) and easily guides the folding line of the separator (B) as needed.