Abstract: A drive system for driving an automatic welding machine for joining the edges of sealing sheets, comprising pressing/advancing rollers located vertically opposite one another and driven by a shared drive motor, downstream of which a transmission gear mechanism is connected, and an upper pressing/advancing roller is disposed rotatably about a roller rotational axis on a tensioning arm of the automatic welding machine, which is pivotable about a tensioning arm axis, and a lower pressing/advancing roller is disposed rotatably about a roller rotational axis on a frame of the automatic welding machine, which is supported by at least two drive rollers, wherein the drive motor and the transmission gear mechanism are rigidly attached to the frame, and the drive motor comprises a motor armature including a protruding rotational shaft, and the transmission gear mechanism comprises a rotatable protruding input shaft and output shaft.

Abstract: A drive system for driving an automatic welding machine for joining the edges of sealing sheets, comprising pressing/advancing rollers located vertically opposite one another and driven by a shared drive motor, downstream of which a transmission gear mechanism is connected, and an upper pressing/advancing roller is disposed rotatably about a roller rotational axis on a tensioning arm of the automatic welding machine, which is pivotable about a tensioning arm axis, and a lower pressing/advancing roller is disposed rotatably about a roller rotational axis on a frame of the automatic welding machine, which is supported by at least two drive rollers, wherein the drive motor and the transmission gear mechanism are rigidly attached to the frame, and the drive motor comprises a motor armature including a protruding rotational shaft, and the transmission gear mechanism comprises a rotatable protruding input shaft and output shaft.

Abstract: A hot-wedge welding device for overlap welding plastic webs, comprising a hot wedge, a pressure device for pressing the plastic webs against the hot wedge which comprises a respective pressure unit associated with one of the hot-wedge flat sides, and further comprising two mutually opposing pressure rollers. The hot wedge is pivotably mounted on a bearing shaft by way of a bearing bushing, which extends between the two hot-wedge flat sides parallel to the hot-wedge front edge at a distance therefrom. The hot wedge is mounted to have defined degrees of freedom with respect to the bearing shaft in the longitudinal direction and in the transverse direction of the bearing bushing, which in addition to the rotational movement of the hot wedge about the transverse axis thereof, also allow a tilting movement of the hot wedge about the longitudinal axis thereof and a vertical displacement of the hot wedge.

Abstract: A hot-wedge welding device for overlap welding plastic webs, comprising a hot wedge, a pressure device for pressing the plastic webs against the hot wedge which comprises a respective pressure unit associated with one of the hot-wedge flat sides, and further comprising two mutually opposing pressure rollers. The hot wedge is pivotably mounted on a bearing shaft by way of a bearing bushing, which extends between the two hot-wedge flat sides parallel to the hot-wedge front edge at a distance therefrom. The hot wedge is mounted to have defined degrees of freedom with respect to the bearing shaft in the longitudinal direction and in the transverse direction of the bearing bushing, which in addition to the rotational movement of the hot wedge about the transverse axis thereof, also allow a tilting movement of the hot wedge about the longitudinal axis thereof and a vertical displacement of the hot wedge.

Abstract: A hot air welding nozzle for a hot air welding device for welding overlapping webs of sealing material. The hot air welding nozzle includes a connection for a hot air supply, a top and a bottom heat plate forming an air space, and at least one rear outlet between the top and bottom heat plate on a facing side that is oriented in a direction opposite to the moving direction of the hot air welding device, with at least one front outlet relative to the moving direction of the hot air welding device, and with air guides that extend beyond the facing sides of the heat plates, at least on the inner side.

Abstract: A welding machine for joining overlapping webs of sealing material, with a powered chassis supported by rolls, with a heating system for local heating of the webs of sealing material that is mounted laterally to the chassis (4) and can be placed between the webs of sealing material in edge regions, with at least a first pressure roll installed on the chassis for pressing together the webs of sealing material to be joined by means of heat, where a second pressure roll serving as a replacement pressure roll is placed in the chassis, whose weight rests on the drive shaft and which can be exchanged without tools for the first pressure roll that is coupled to the drive shaft of the welding machine and presses together the bitumen webs to be joined. In addition, the pressure roll (3) may have at least one contact surface made of hard metallic material; and a stripper element is provided whose free end contacts the contact surface or is in close proximity to the same.

Abstract: A hot air welding nozzle for a hot air welding device for welding overlapping webs of sealing material, in particular webs of bitumen. The hot air welding nozzle includes a connection for a hot air supply, a top and a bottom heat plate forming an air space, and at least one rear outlet between the top and bottom heat plate on a facing side that is oriented in a direction opposite to the moving direction of the hot air welding device, with at least one front outlet relative to the moving direction of the hot air welding device, and with air guides that extend beyond the facing sides of the heat plates, at least on the inner side, i.e. the side facing away from the connection for a hot air supply. With the hot air welding nozzle designed as proposed by the invention, and/or a hot air welding device of appropriate design, it is now possible to weld webs of sealing material, in particular webs of sealing material made of bitumen, considerably faster due to the long pre-heating zone.

Abstract: A welding machine for joining overlapping webs of sealing material, with a powered chassis supported by rolls, with a heating system for local heating of the webs of sealing material that is mounted laterally to the chassis (4) and can be placed between the webs of sealing material in edge regions, with at least a first pressure roll installed on the chassis for pressing together the webs of sealing material to be joined by means of heat, where a second pressure roll serving as a replacement pressure roll is placed in the chassis, whose weight rests on the drive shaft and which can be exchanged without tools for the first pressure roll that is coupled to the drive shaft of the welding machine and presses together the bitumen webs to be joined. In addition, the pressure roll (3) may have at least one contact surface made of hard metallic material; and a stripper element is provided whose free end contacts the contact surface or is in close proximity to the same.

Abstract: An air heater is provided with a connecting case for the power supply and the air to be heated, as well as a heating element attached to the connecting case by means of a carrier. In the connecting housing, the carrier is connected via a plug connection with the connection board for transmitting the heating current. For this purpose, a receptacle angle bracket is provided that can be inserted into the connecting housing and locked in place. The receptacle angle bracket has cylindrical sleeves serving as electrically insulating bushings for the contact pins on the carrier. In order to tap reference voltages for the control device, the contact pins of the plug connection can be connected with the contact tracks of the connection board of the control device by means of rubber-elastic conductive connecting elements.

Abstract: An air heater is provided with a connecting case for the power supply and the air to be heated, as well as a heating element attached to the connecting case by means of a carrier. In the connecting housing, the carrier is connected via a plug connection with the connection board for transmitting the heating current. For this purpose, a receptacle angle bracket is provided that can be inserted into the connecting housing and locked in place. The receptacle angle bracket has cylindrical sleeves serving as electrically insulating bushings for the contact pins on the carrier. In order to tap reference voltages for the control device, the contact pins of the plug connection can be connected with the contact tracks of the connection board of the control device by means of rubber-elastic conductive connecting elements.