Automatically controlled thermo-cementing and folding machine

A thermo-cementing and folding machine comprising

• a main drive shaft,
• folding instrumentalities arranged at an operating locality of the machine and including a creaser foot over which a marginal portion of a workpiece can be turned,
• workpiece feeding means operable in timed relation with rotation of the main drive shaft for intermittently feeding a predefined length of the workpiece through the operating locality, and
• means for varying the predefined length of workpiece being fed, without varying the speed of rotation of the main drive shaft, and
• adhesive supply means by which adhesive can be supplied, through a passage in the creaser foot, to the marginal portion of the workpiece being turned thereover wherein the adhesive supply means comprises a gear pump driven by an n.c. motor in response to drive signals which are supplied thereto in timed relation with the rotation of the main drive shaft, but the incidence of which is modified according to the operational state of the means for varying the predefined length of workpiece being fed whereby the rate at which adhesive is supplied to the workpiece marginal portion can be modified in response to variation in the predefined length of workpiece being fed.