of the container to install a new container 22 on the device 2 it is merely necessary to slide its guide portions 23 into the recesses of the legs of frame 16 from the open side of the latter until the container is properly in place on the frame then the closure 24 is moved to open position so that toner can drop through the open side of the container into the trough when the need arises to remove the container 22 before it is empty i e to perform maintenance on the device 2 or to replace the container with another one which supplies a different type of toner the closure 24 is moved back to its closure position in which it blocks the open side of the container thereafter the frame 16 with the container 22 is slightly raised by pivoting in the direction of the arrow a until the lower side of container 22 i e the closure 24 moves out of contact with toner still located in the trough 12 the container 22 can then be pulled out of the frame 16 without any danger that it might take along some of the toner from trough 12 and cause soiling of any parts of the machine a replacement container or the same container is installed in reverse sequence and with the frame 16 in the aforementioned slightly lifted position subsequent to such installation the frame 16 is returned to its operating position fig1 and the closure moved to open position it will be seen that this arrangement makes it possible to withdrawn and install partially filled containers of toner at will without.