A sheet conveyance unit includes a sheet inlet port, an inlet guide, and a guide switching mechanism. The inlet guide has an upper guide and a lower guide below the upper guide. The guide switching mechanism switches a position of the inlet guide between a conveyance position at which the upper guide and the lower guide face each other with a first distance and a separation position at which the upper guide and the lower guide are spaced from each other by a second distance greater than the first distance. To connect the sheet conveyance unit to the sheet discharge unit, the inlet guide is disposed to the separation position before the discharge guide is inserted between the upper guide and the lower guide, and is disposed to the conveyance position after the discharge guide is inserted between the upper guide and the lower guide.

A sheet conveyance unit includes a sheet inlet port, an inlet guide, and a guide switching mechanism. The inlet guide has an upper guide and a lower guide below the upper guide. The guide switching mechanism switches a position of the inlet guide between a conveyance position at which the upper guide and the lower guide face each other with a first distance and a separation position at which the upper guide and the lower guide are spaced from each other by a second distance greater than the first distance. To connect the sheet conveyance unit to the sheet discharge unit, the inlet guide is disposed to the separation position before the discharge guide is inserted between the upper guide and the lower guide, and is disposed to the conveyance position after the discharge guide is inserted between the upper guide and the lower guide.

A filament feeding device (100) for use in 3D-printing comprising a first feeding wheel (110) configured to rotate with a first rotational shaft (112) and a second feeding wheel (120) configured to rotate with a second rotational shaft (122). The first and second feeding wheels (110, 120) are separated by a separation distance so as to allow feeding of a filament material received between said first and second filament wheels (110, 120). The filament feeding device further comprises an adjuster element (130) movable between a first distinct position (130a) setting said separation distance to a first predetermined distance, and into a second distinct position (130b) setting said separation distance to a second predetermined distance, and wherein said second predetermined separation distance is larger than said first predetermined separation distance. Further, a 3D-printer comprising such a filament feeding device is herein disclosed.

A device and a method are for stacking value documents. The device includes a stacker unit for receiving the value documents and a conveyor unit for conveying the value documents into the stacker unit. The stacker unit has a rotatable stacker wheel for receiving the value documents, wherein the rotatable stacker wheel has a plurality of deflectable stacker wheel segments which are provided along the circumference of the rotatable stacker wheel in a mutually spaced manner. Each of the deflectable stacker wheel segments defines a respective receiving region for receiving at least one of the value documents. The device additionally has a deflecting unit which is designed to deflect each stacker wheel segment individually to thus modify the size of the respective receiving region associated with the stacker wheel segment.