side of the in line trough 4 as shown in fig7 to 10 thereby making only the article turning toward the required direction pass through but letting the other works fall down the feature of this invention lies in the fact that the selection of articles can be done by making use of the unbalance between the left and right barycenters for the purpose of making the works move forward in the horizontal state so that the works are enable to be transferred through the easy and accurate detection of the very trifling difference between the upper and lower surfaces as illustrated in the figures the article transfer section shown in fig1 is provided with a brim 49 a little lower than the thickness of the article w whereby it permits passage of articles only one article even when the more than two articles come thereto one over another and furthermore it has the ability also to transfer articles of about 0 2 m m the articles which pass through the article transfer section b unhindered reach the front part of the in line trough 4 under the protection of the cover 47 when they are transferred to a fixed trough 16 or an in line feeder being connected to some assembly machine not shown the distance between the fixed trough 16 and the in line trough 4 is sufficient to be about 0 5 u02dc 3 m m though it depends on the frequency of vibration or the shape of the work but if the border between the two is made oblique as shown in the figure it becomes possible to make the transfer.