A tubular bag machine comprising: - a tubular bag assembly unit including a longitudinal sealing unit (1 a) and a transversal sealing unit (1 b) configured to produce tubular bags with products or product groups received therein from a foil web that runs in a longitudinal direction, - a product feed device, in particular a product band for supplying the products or product groups to be packaged, - a feed chain unit including a contact surface for the products and a feed chain extending in a longitudinal direction, in particular an endless feed chain including carriers arranged on the feed chain with a longitudinal offset for moving the products forward along a feed path, - at least one control for controlling the entire tubular bag machine, characterized in that - the carriers are attached at the feed chain in a disengageable manner and are at least partially disengageable from the feed chain that is mounted in the tubular bag machine and which are attachable at different longitudinal positions at the feed chain, - plural pickers that are offset along the feed chain in the longitudinal direction upstream from the tubular bag assembly unit so that the feed chain as well as the product band is arranged in an operating portion of the tubular bag assembly unit, and - the control is configured to control a running speed of the foil web on the one hand side and on the other hand side a running speed of the feed chain independently from each other or as a function of each other and to control the running speed of the feed chain as a function of a number of products arriving in a transposing portion of pickers per unit time. - a tubular bag assembly unit including a longitudinal sealing unit (1 a) and a transversal sealing unit (1 b) configured to produce tubular bags with products or product groups received therein from a foil web that runs in a longitudinal direction, - a product feed device, in particular a product band for supplying the products or product groups to be packaged, - a feed chain unit including a contact surface for the products and a feed chain extending in a longitudinal direction, in particular an endless feed chain including carriers arranged on the feed chain with a longitudinal offset for moving the products forward along a feed path, - at least one control for controlling the entire tubular bag machine, characterized in that - the carriers are attached at the feed chain in a disengageable manner and are at least partially disengageable from the feed chain that is mounted in the tubular bag machine and which are attachable at different longitudinal positions at the feed chain, - plural pickers that are offset along the feed chain in the longitudinal direction upstream from the tubular bag assembly unit so that the feed chain as well as the product band is arranged in an operating portion of the tubular bag assembly unit, and - the control is configured to control a running speed of the foil web on the one hand side and on the other hand side a running speed of the feed chain independently from each other or as a function of each other and to control the running speed of the feed chain as a function of a number of products arriving in a transposing portion of pickers per unit time.