A packer machine to produce a rigid pack of smoking articles comprising: a wrap obtained by folding a wrapping sheet around a group of smoking articles, and an outer container obtained by folding a blank and a collar around the wrap; the packer machine comprises: a forming conveyor, which moves a plurality of first pockets along a forming path; a hopper, which is arranged in front of the forming conveyor and along the forming path and is provided with at least one output mouth, from which the group of smoking articles can be pulled out; a wrapping conveyor, which is arranged downstream of the forming conveyor and is designed to move the group of smoking articles and the wrapping sheet along a first wrapping path which is straight and horizontal so as to fold the wrapping sheet around the group of smoking articles and, hence, form the wrap; a first wrapping drum, which is arranged downstream of the wrapping conveyor, supports at least one second pocket designed to contain the wrap and the collar, and is mounted so as to rotate around a first horizontal rotation axis in order to move the second pocket along a second wrapping path which is circular; a second wrapping drum, which is arranged downstream of the first wrapping drum, supports at least one third pocket designed to contain the wrap, the collar and the blank, and is mounted so as to rotate around a second horizontal rotation axis, which is parallel to the first rotation axis, in order to move the third pocket along a third wrapping path, which is circular and perpendicular to the first wrapping path; and a transfer conveyor, which is interposed between the wrapping conveyor and the first wrapping drum and transfers the wrap from the wrapping conveyor towards the first wrapping drum along a transfer path; the packer machine is characterized in that: the first rotation axis is parallel to the first wrapping path and, therefore, the second wrapping path is perpendicular to the first wrapping path; and the transfer path is perpendicular to the first wrapping path and is perpendicular to the first rotation axis. a forming conveyor, which moves a plurality of first pockets along a forming path; a hopper, which is arranged in front of the forming conveyor and along the forming path and is provided with at least one output mouth, from which the group of smoking articles can be pulled out; a wrapping conveyor, which is arranged downstream of the forming conveyor and is designed to move the group of smoking articles and the wrapping sheet along a first wrapping path which is straight and horizontal so as to fold the wrapping sheet around the group of smoking articles and, hence, form the wrap; a first wrapping drum, which is arranged downstream of the wrapping conveyor, supports at least one second pocket designed to contain the wrap and the collar, and is mounted so as to rotate around a first horizontal rotation axis in order to move the second pocket along a second wrapping path which is circular; a second wrapping drum, which is arranged downstream of the first wrapping drum, supports at least one third pocket designed to contain the wrap, the collar and the blank, and is mounted so as to rotate around a second horizontal rotation axis, which is parallel to the first rotation axis, in order to move the third pocket along a third wrapping path, which is circular and perpendicular to the first wrapping path; and a transfer conveyor, which is interposed between the wrapping conveyor and the first wrapping drum and transfers the wrap from the wrapping conveyor towards the first wrapping drum along a transfer path; the packer machine is characterized in that: the first rotation axis is parallel to the first wrapping path and, therefore, the second wrapping path is perpendicular to the first wrapping path; and the transfer path is perpendicular to the first wrapping path and is perpendicular to the first rotation axis. the first rotation axis is parallel to the first wrapping path and, therefore, the second wrapping path is perpendicular to the first wrapping path; and the transfer path is perpendicular to the first wrapping path and is perpendicular to the first rotation axis.