for a flat raise cam member a straight slot for a flat welt guard cam member and a pair of two legged angular slots for an angular main cam member as shown section block 10 is provided with slots 20 20 39 and 20 34 for the flat raise cam members and slots 22 22 39 and 22 34 for the flat welt cam members slots 24 and 26 24 39 and 26 39 24 34 and 26 39 are provided for the angular main cam members raise cam members 28 28 39 and 28 34 are shown in slots 20 20 39 and 20 34 and welt cam members 30 30 39 and 30 34 in slots 22 22 39 and 22 34 respectively main cam members 32 32 39 and 32 34 are shown in angular slots 26 26 39 and 24 34 respectively the other angular slots 24 24 39 and 26 34 being empty the raise cam members and welt cam members are disposable in either of two positions in the cam section block an active position wherein they may engage needle butts and a retracted position wherein they are withdrawn from the path of needle butts the angular main cams are disposable in an active.