Abstract: A process for sewing the edge of a woven material to prevent fraying, by sewing alternately at least two stitches along the edge of the material and at least two stitches parallel to the edge of the material but spaced from the edge, with zigzag connecting stitches joining the two rows, where the stitches along the edge and the connecting stitches are sewn in a direction opposite to the stitches parallel to and spaced from the edge.

Abstract: A missile security mechanism comprises a sliding rod having two axially spaced-apart grooves, a socket slidably mounted on the rod and having hooks able to engage in one of these grooves then the other, and an inertia-block in the form of a sleeve surrounding and locking the hooks in the groove in which they are engaged. The inertia-block is displaceable by inertia against the action of a biasing spring to free the hooks. A second spring biases the rod towards the socket, the rod being held by a pawl which is movable to free the rod in response to a given displacement of the inertia-block.

Abstract: A portable sewing machine comprises a frame formed of a base, a column, an upper arm, a head and flaps detachably hinged to edges of the upper face of the base. The machine stands on a part of the base adjacent the column and the base has an overhanging free end part enabling the sewing of tubular articles when the flaps are removed.

Abstract: An electronic firing device of a missile, enabling precise setting of a time delay from several milliseconds up to an hour or more, comprises an energy accumulator formed by a capacitor associated with an energy receiving coil charging the capacitor from an external signal. This signal has a low frequency energy-supply component and a high frequency signal having a series of pulse trains defining a decimal number up to, for example, 10.sup.7. The high frequency signal passes via a coded selective filter supplying, to a memory, a coded value defining a time delay. An oscillator triggered by a security switch supplies clock signals which are divided to provide 1 millisecond pulses counted in a coding circuit in the same code as the memory. This coding circuit and the memory are connected to a comparator which supplies a firing signal when the count reaches the memorized value.

Abstract: A pre-assembled sub-assembly of a plate carrying a needle bar on an oscillable cradle is mounted in a head at the free end of the upper arm of a zig-zag sewing machine. The upper edge of the plate is pivotally suspended from and slidable along a transverse bar. The plate is angularly fixed with the bore of a member on the needle bar in alignment with and receiving a gudgeon of a crank rod driven by the principal shaft of the machine, and is fixed on the bar to align the needle bar for cooperation of the needle with a shuttle hook.

Abstract: A zig-zag sewing machine has a series of cams juxtaposed on a drive shaft for controlling oscillation of a needle-bar cradle. Cam selection is achieved by a manual selector having two cam profiles, one of which controls a lever to space a feeler apart from the cams at the moment when the other cam profile controls another lever to move the feeler parallel to the drive shaft to change the cam with which the feeler cooperates.

Abstract: An information transmitting system by means of a coded magnetic signal permitting adjusting the options in a fuze. A primary winding magnetically induces a coded current in a secondary winding located within a housing. A conductive short-circuit ring is located between both windings for concentrating the magnetic flux within the receiving winding, and thus reducing the magnetic losses.

Abstract: An electronic firing device for a pyrotechnic charge in a projectile comprises a programmable unijunction transistor controlled by the discharge of a firing capacitor to fire an electric fuse. An oscillator supplies a pulsed output signal via a charging circuit to intermittently charge the capacitor in steps. The oscillator output signal is also supplied as a clock signal to a delay device controlling conduction of the transistor to fire the fuse after a given delay following an impact.

Abstract: A sewing machine has an upper arm and a lower free arm carried by a column and two longitudinal supports disposed on either side of the free arm and connected to the base of the column. At least one of the supports is slidable laterally outwards from a position closing off the free arm to a position allowing access to the free arm under the action of a biasing spring, but is retained in the withdrawn position by a catch cooperating with an abutment on a transverse guide rod fixed on the support.

Abstract: An electric firing device for a pyrotechnic charge in a projectile comprises a pulse generator, a pulse-activable firing control element, and means controlling the application of pulses to this element. Said means comprise an electromagnetic transducer including a primary winding receiving pulses from the generator, a secondary winding connected to said element and a ferromagnetic core coupling the windings. The core and windings are movable relative to one another, for example by mounting the windings in an inertia block, to vary the coupling and control firing upon impact.

Abstract: A bobbin carrier of a sewing machine is suspended in a surrounding plate solely by several radial pins bridging the space between the carrier and the plate and which can be successively temporarily retracted from the space by a rotating cam. A hook turning with the cam takes up thread from a needle and drives it about the bobbin carrier, in synchronization with retraction of the pins, for the formation of a stitch with a thread fed from a bobbin in the carrier.

Abstract: A method for making a buttonhole in a piece of material using a zigzag stitch sewing machine wherein the lips of the buttonhole are formed by the alternate stitching of opposite fractions of the desired length of the two lips, the stitching always being carried out in the same direction, and this process being repeated until the desired length is achieved. The material is moved in the reverse direction in the period between the finishing of one fraction of two opposite fractions and the starting of the other. The method is almost entirely automatic, all movements being regulated by interchangeable cams on the machine, and operator supervision is minimal.

Abstract: A time fuse for a non-spinning projectile has a pivoted catch connecting a fuse setting member to a setting disc whereby rotation of the member rotates the disc to wind a clockwork spring. A plunger is locked in a housing in the setting member by a movable ball or spring held by a spring-urged inertia block. When the fuse is set, the plunger acts on the catch to disconnect the disc and member upon displacement of the inertia block in response to axial acceleration of the projectile in a piece of ordnance.

Abstract: A mechanism for controlling the direction and amplitude of a cloth feeder in a sewing machine comprises a cam keyed on a spindle having a control button, said cam acting on an actuating arm of a control shaft of which the angular position determines the direction and amplitude of the feeder. By turning the control button, the cam angularly sets the actuating arm and hence the stitch length. When the button is turned to a given angular position, a cam profile thereon axially displaces a sliding rod to push a sliding pinion and bring a cam profile of the pinion into contact with an eccentric protuberance of the cam. The pinion is driven by the main shaft of the machine so that in said given position of the button it axially reciprocates the cam and hence automatically modulates the direction and amplitude of the cloth feeder to execute a special stitch.