is in turn slidingly attached to the tie bar 32 of the machine frame by means of the long holes 30 and the attachment screws 31 the following is a description through fig8 and 9 of the moving mechanism for the depressor 15 of fig5 the piston cylinder unit 17 shown in fig5 is attached to the holder 18 which is in turn attached to the sliding piece 20 the sliding piece 20 is installed in the same manner as the same sliding piece of fig6 and 7 so that the description for fig6 and 7 can serve for its attachment and movement the moving mechanism for longitudinal shifting of the depressor 15 has already been discussed above in connection with fig5 fig1 shows the device with an offset rake capable of being set to an operating position 31 and to inactive position 32 whereby the left portion of fig1 is essentially the same as fig2 i e fig1 also shows the depressor 10 in the intermediate position 12 and in the depressing position 13 the offset rake 7 is rotatably and linkingly connected via axle 33 to a bearing arm 34 and is extehded beyond axle 33 into the extension arm 35 at the end of which the ram 37 of the piston cylinder unit 38 begins at axle 36 the piston cylinder unit 38 is attached to the bearing arm 34 via support 39 as the ram 37 is pushed out or pulled in the extension arm 35 is swivelled causing.