An apparatus and method for forming a stack with advertising material compilations respectively consisting of an envelope with inserts therein, and having a common, leading folded edge. The apparatus includes a feed conveyor, a transfer conveyor and a stacking device. The transfer conveyor comprises a central wheel that rotates around a first rotational axis, a carrier wheel that rotates around a second rotational axis oriented parallel to the first rotational axis, and a number of pivoting arms with respectively one gripper. The second rotational axis is arranged below a horizontal plane extending through the first rotational axis. The grippers are respectively positioned on the pivoting arm to rotate around an axis. The grippers take over the advertising material compilations in a takeover region from the feed conveyor, transfer the adverting compilations in a transfer region to the stacking device which extends into the transfer region and deposit these on the stacking device.

A mounting member to be mounted on a member that moves in a traveling direction includes: a rectangular sheet member; and an attachment portion having a first surface bonded to one end portion of a reverse surface of a downstream side portion of the sheet member in the traveling direction, the attachment portion being detachably attached to an attachment-receiving portion and having a surface facing a direction different from a direction of the first surface and bonded to the sheet member.

A mounting member to be mounted on a member that moves in a traveling direction includes: a rectangular sheet member; and an attachment portion having a first surface bonded to one end portion of a reverse surface of a downstream side portion of the sheet member in the traveling direction, the attachment portion being detachably attached to an attachment-receiving portion and having a surface facing a direction different from a direction of the first surface and bonded to the sheet member.