Abstract: A sewing machine includes a contact area for two superimposed material webs, which have edges and which are to be sewn together by the sewing machine, wherein, in order to align the edges of the material webs to each other, there is a bottom guide element under the contact area for the bottom material web and a top guide element for the top material web above the contact area, wherein the guide elements are each rotatably mounted about a rotation axis. The rotation axes of the guide elements are arranged extending perpendicular to the contact area.

Abstract: A hot air adhesive bonding device includes an adhesive bonding area for adhesively bonding two materials, of which one is provided with an adhesive that can be activated with supplied hot air, and a hot air device including an air heating device and an air application device directed at the material provided with the activatable adhesive in the adhesive bonding area, wherein the air application device exhibits an air chamber. The air heating device is designed as part of the air application device situated in the adhesive bonding area, and a wall of the air chamber that faces the material provided with adhesive is designed to allow thermal radiation to pass through.