摘要:
AN APPARATUS FOR FORMING A UNITARY ARTICLE, SUCH AS A PRINTING DISK, FROM POWDERED METAL WHEREIN AT LEAST ONE GIVEN FACE OF THE ARTICLE IS REQUIRED TO HAVE A PREFERRED GRAIN DENSITY. A DIE, COMPLEMENTARY IN AREA AND CONFIGURATION TO THE GIVEN FACE, IS PROVIDED FOR FORMING THE GIVEN FACE OF SAID PREFERRED GRAIN DENSITY. THE FACE-FORMING DIE IS MOUNTED WITHIN AN APERTURE IN THE INNER WALL OF A MOLDING CAVITY WHEREIN THE APERTURE HAS AN OUTLET ON THE CAVITY AND IS DIMENSIONALLY GREATER THAN THE FACEFORMING DIE. A SPACE IS PROVIDED ABOUT THE FACE-FORMING DIE FOR THE ACCUMULATION OF A DISPOSABLE PORTION OF COMPACTED POWDERED METAL OF LESS THAN SAID PREFERRED GRAIN DENSITY, THE SPACE BEING PARTIALLY BOUNDED BY SURFACES AROUND SAID FACE-FORMING DIE AND SLOPING AWAY THEREFROM TO THE WALLS OF THE APERTURE. POWDERED METAL IS PLACED IN THE MOLD AND FORCED AGAINST THE FACE-FORMING DIE AND INTO THE PROVIDED SPACE, THEREBY FORMING A UNITARY ARTICLE HAVING A PREFERRED GRAIN DENSITY AT ONE OR MORE GIVEN FACE WHILE SIMULTANEOUSLY PROVIDING FOR THE ACCUMULATION OF THE DISPOSABLE PORTION OF LESS DENSE METAL WHICH MAY BE REMOVED IN SUBSEQUENT OPERATIONS. THE MOLDED ARTICLE IS SINTERED TO RELIEVE WORK-HARDENING AND THEN RESTRUCK TO INSURE SAID PREFERRED GRAIN DENSITY AND TO IMPROVE FACIAL DEFINITION. THE RESTRUCK ARTICLE MAY BE SUBJECTED TO FURTHER HEAT-TREATING OPERATIONS DEPENDING ON THE DESIRED PHYSICAL CHARACTERISTICS REQUIRED OF THE FINISHED ARTICLE.
摘要:
A logic circuit comprising a signal amplifier, a negative feedback connection from the output to the input of the amplifier, a plurality of input terminals, and a plurality of unilateral conductors coupling the respective input terminals to the amplifier so the amplifier output signal is a logical function of binary signals applied to the input terminals. The amplifier is biased to remain unsaturated in response to the binary signal swing at the input terminals, and the negative feedback connection is designed to introduce negligible delay. In an AND gate, the amplifier is a multi-emitter transistor and the unilateral conductors are the emitter-to-base junctions of the transistor. In an OR gate, the amplifier is a transistor and the unilateral conductors are emitter-follower transistor stages coupling the respective input terminals to the emitter of the transistor amplifier.
摘要:
Apparatus for imparting various rotational motions to a driven member in which a constantly rotating driving member transmits a predetermined angular velocity to the driven member by means of a frictional coupling. The angular velocity of the driven member is varied by overcoming the driving torque applied to the driven member by the frictional coupling. Means cooperating with the driving and driven members serve, respectively, to brake and to reverse the rotational motion of the driven member.
摘要:
A display panel comprises a plurality of gas-filled cells arranged in rows and columns and including electrode means for firing said cells in a predetermined pattern. The panel also includes a mask having a pattern of openings and overlaying the cells so that the glow of selected cells glowing through selected ones of said openings provides a display of a character.
摘要:
A torque coupling mechanism having a driving member engageable by engaging means that is pivotally connected to a driven member for rotation of the driven member in one normal direction. An engagement sustaining means maintains the engaging means in engagement with the driving member when the coupling mechanism is subjected to a torque tending to rotate the driven member in an opposite direction from normal rotation.
摘要:
Apparatus for printing characters with an impact intensity varying according to the surface area of the character being printed. Included in the apparatus is a cyclically movable character bearing member, such as a rotary print wheel or drum or an endless belt and one or more print hammers cooperable with the member forming a printing couple for printing characters. An electromagnetic field produced by a solenoid initiates the flight of the hammer against a document which may be moved relatively thereto as the printing operation is performed. The current through the solenoid coil is limited by resisters of different values which are controlled by electrical gates for selectively varying the amount of current supplied to the coil for driving the hammer. The timing of the printing is kept in synchronization with the document movement by means of an electromechanical clock capable of dividing each character position into an equal number of zones. During the operation of the printing apparatus, the sequence of accessing the digits to be printed, positioning the print wheel, and firing the hammer continues as the document moves through the apparatus. Associated with the print wheel and jointly rotatable therewith is a disk having a plurality of coded positions represented by apertures therein each position representing a printing character position on the print wheel.
摘要:
A floating frame, holding a pair of inclined combs, accepts a printed circuit board and the individual conductors of a multiconductor cable. The frame is movable horizontally by a micrometer adjustment device and vertically by torque limit knobs to align and clamp the conductors of the cable into a bonding position on the circuit board after the combs have individually engaged the conductors of the cable.
摘要:
A clutch mechanism for reciprocatingly engaging a driven member with a driving member wherein the driven member is biased in one rotational direction and alternately driven over a predetermined arc in the opposite direction. The respective angular positions of engagement and disengagement of the driven member with the driving member are determined by angularly displaced restraining means that actuate an engagement control member carried with the driving and driven members.
摘要:
There is described a control for accessing the main memory of a digital computer from a processor or a number of input/output control units on a time-sharing basis where the processor operates at a clock rate twice the speed of the input/output control devices. A buffering arrangement is provided which permits overlapping of the servicing of the input/output devices and the servicing of the processor which permits the processor to access memory between each input/output device memory access while still permitting the input/output devices to be serviced on a continuous basis.
摘要:
The overlay of information from the computer memory to a peripheral memory and its return to the computer memory are facilitated by a unique format for original and copy descriptors. The copy descriptors have a first field that designates either a base address or the location of its original, and a second field that designates an index. The original descriptors have a field that designates the base address. The copy descriptors are automatically generated from their originals. When a copy descriptor is retrieved, the first and second fields are added to form the absolute address if the first field is the base address. If the first field is an original descriptor location, the base address of the original descriptor and the index of the copy descriptor are added to form the absolute address. Upon overlay, the copy descriptors to be updated are sensed by comparing their base value with the base value of the array to be overlaid. They are updated by substituting the original descriptor location for the base address and the original descriptors are updated by substituting the peripheral memory address for the base address. Upon return of the overlaid information to the computer memory, only the original descriptor must be updated.