supported by the supports 17 17 for movement in the vertical direction and the transverse sealing means 18 is mounted on the upper vertical rod 16b the lower vertical rod 16 may also be attached to the transverse rod 13 at the side of the support shaft 14 not shown opposite the engagement point of the crank pin 12 when a bag packed product is produced using the above device the conditions and speed of sealing are set by changing the ascending and descending speeds of transverse sealing means 18 through a change in the rotational speed of the cranking disc 11 the ascending speed is set higher by positioning the crank pin 12 at a radially outer location on the disc 11 and is set lower by positioning the crank pin 12 at a radially inner location on the disc 11 on the other hand the ascending descending stroke of the transverse sealing means 18 can be changed by moving the pivot 15 for example moving the pivot 15 closer to the support shaft 14 makes the stroke smaller while moving it in the opposite direction makes the stroke larger the descending speed is lower in the former and higher in the latter in this way the crank pin 12 and pivot 15 are positioned as required and the rotation of the cranking disc 11 is set to a required speed so that the ascending descending stroke of the transverse sealing.