A grinding pin (53) for notch grinding is provided. The grinding pin comprises a cylindrical region of formable grinding material and in which is formed a groove (18) for forming a notch. The length of the cylindrical region is such that further grooves (20) can be formed therein as each groove becomes too worn to form a notch.

An electrical machine comprises a four-pole stator 2 provided with a field winding 10 and an armature winding 11, each of the windings 10, 11 being split into two coils 22, 23 or 24, 25 closely coupled and wound so that diametrically opposite portions of both coils are disposed within diametrically opposite stator slots. A two-pole rotor (not shown) without windings is rotatable within the stator 2, and a circuit is provided for energising the armature coils 24 and 25 when direct current is supp...

A press station for a forming machine for forming articles from paper has a chamber consisting of two halves. The two halves of the chamber are able to be closed together and the chamber can be evacuated through a main vacuum manifold in order to bring the upper die mounted on a first platen into pressing contact with a fragile moulding positioned on a second platen in order to form the required article.

A method and apparatus are proposed for cleaning the ink chamber (27) of the ink rail (11) of a printing machine ink supply system and from whch ink is delivered to an ink roller through a multiplicity of side-by-side stepped feed holes (29) in the rail (11) , the method and apparatus utilising a plug (41) freely slidable within the chamber (27) and adapted to purge the chamber (27) of ink present in advance of the plug (41) on its movement longitudinally of the chamber. In analogous manner the ...

A torque machine, for making or breaking screw-threaded joints between lengths of pipe, includes a rotatable head having an aperture into which a length of pipe is introduced, the rotatable head including a number of tongs which are spaced apart around the aperture and can be moved inwardly to grip the length of pipe. A separate jaw collar is provided for location between the tongs and the pipe, the collar comprising a number of part-annular sectors which are connected by springs or elastic link...

A hopper for a weighing machine which has a tubular body and a closing valve which is comprised of several plates which are pivotably mounted around the bottom of the hopper for movement in a plane transverse to the axis of the hopper. The plates are simultaneously driven between open and closed positions by a common belt or chain so that the closing forces of the plates are balanced. The belt is coupled to a driving mechanism through a lever mounted on the hopper which disconnects from the driv...

A splitter for splitting stone, concrete, wood and the like comprising a frame (21), a first splitter blade (24) moveable relative to the frame (21), a second splitter blade (23), and hydraulically actuatable means (26, 27) for pulling the first splitter blade (24) towards the second splitter blade (23) to effect said splitting. The hydraulically actuatable means (26, 27) preferably acts on end portions of the first blade (24) to provide increased leverage for the splitting operation. The first ...

A mailing machine including a scanner for detecting data marks printed on documents to be mailed for conveying control information to the machine, for example in the manner known as the "Optical Mark Recognition" system. The machine includes a memory buffer for storing data concerning the marks if the user inputs data indicating that the reference or "gate" mark is at the end of the group of marks. The data may then be read from the buffer in the reverse order. Thus, the data marks may be printe...

For improving characteristic uprising at the right-hand side of head-flow rate characteristic of a turbo machine, as well as for suppressing increase of vibration and/or noises thereof, a plurality of first grooves 24 in direction of gradient in pressure of fluid are formed on an inner flow surface of a casing, for connecting an inlet side of blades of an impeller and an area on the inner flow surface of the casing where the impeller blades reside in, over an inner circumference of the casing. A...

A turbo machine comprising: an impeller having a plurality of blades therewith; a casing having a flow surface defined therein and being positioned with the impeller therein; and a plurality of grooves being formed in the flow surface of the casing, for connecting between an inlet side of said impeller and an area on the flow surface of the casing in which the blades of said impeller reside, on a periphery thereof, wherein an index of determining a form of the grooves is obtained by a following ...