A packer machine to produce a pack ; the packer machine comprises: a protection case ; a wrapping line , which is provided with a plurality of movable wrapping devices ; at least one first actuator , which is designed to cause the movable wrapping devices to move; an insertion station (S 1), which is arranged along the wrapping line and where the wrapping line receives one single wrapping material to be folded; an input station (S2), which is separate from the wrapping line and has a loading opening obtained in the protection case ; a transfer unit , which is designed to receive wrapping material groups in the input station (S2) and to direct the wrapping material towards the wrapping line ; and at least one second actuator , which is independent of the first actuator and is designed to move the transfer unit ; wherein the protection case encloses the input station (S2), i.e. prevents the direct access from the outside to the input station (S2); the packer machine is characterized in that it comprises: a sensor device , which is designed to detect the presence of a body in the loading opening of the input station (S2); and a control unit , which is configured to stop, when the packer machine is working, the sole second actuator , thus allowing the first actuator to normally operate, if the sensor device detects the presence of a body in the loading opening and to automatically restart the second actuator if the sensor device stops detecting the presence of a body in the loading opening . a protection case ; a wrapping line , which is provided with a plurality of movable wrapping devices ; at least one first actuator , which is designed to cause the movable wrapping devices to move; an insertion station (S 1), which is arranged along the wrapping line and where the wrapping line receives one single wrapping material to be folded; an input station (S2), which is separate from the wrapping line and has a loading opening obtained in the protection case ; a transfer unit , which is designed to receive wrapping material groups in the input station (S2) and to direct the wrapping material towards the wrapping line ; and at least one second actuator , which is independent of the first actuator and is designed to move the transfer unit ; wherein the protection case encloses the input station (S2), i.e. prevents the direct access from the outside to the input station (S2); the packer machine is characterized in that it comprises: a sensor device , which is designed to detect the presence of a body in the loading opening of the input station (S2); and a control unit , which is configured to stop, when the packer machine is working, the sole second actuator , thus allowing the first actuator to normally operate, if the sensor device detects the presence of a body in the loading opening and to automatically restart the second actuator if the sensor device stops detecting the presence of a body in the loading opening . a sensor device , which is designed to detect the presence of a body in the loading opening of the input station (S2); and a control unit , which is configured to stop, when the packer machine is working, the sole second actuator , thus allowing the first actuator to normally operate, if the sensor device detects the presence of a body in the loading opening and to automatically restart the second actuator if the sensor device stops detecting the presence of a body in the loading opening . <EOS>