Abstract: A recorder using a carbon backed "self-developing" dry silver recording medium which is guided over a recording and developing path includes a pair of rollers one of which is connected to a ground potential and the other to a positive potential with the electrically conducting carbon coated side of the recording medium arranged to contact both of the rollers to enable electrical current to pass through the carbon backing to generate the heat required to develop the recording thereon. A third roller is arranged to contact the recording medium on the recording side and to press the carbon coated side against a second location on the ground roller to provide a second current conducting path between the positive potential roller and the ground roller. The electrical current is controlled in accordance with the speed of the recording medium to insure a proper developing time relationship at different recording medium speeds.

Abstract: A fluid valving system for a chromatographic analyzer apparatus has an analyzer oven with a sampling valve and fluid sample storage loop therein while switching valves for directing a sample to be analyzed, a carrier gas and a wash solvent through the sample loop and the sampling valve are located externally to the oven. A timer is used to operate the switching valves and the sampling valve in a desired sequence which includes directing the wash solvent through the storage loop and sample lines while maintaining a flow of carrier gas through a chromatographic column connected to the sampling valve.

Abstract: There is shown a digital output circuit wherein digital data from a computer based controller is applied as input signals to a set of holding latches which are, in turn, enabled by control circuitry such as by response to address signals. The digital data stored in the several holding latches are applied as input signals to a corresponding number of relay driver circuits. The relay driver circuits are, in one aspect of the invention, coupled to selectively operate output control relays in accordance with the data signals applied to the driver circuits therefor. In another form, the driver circuits are connected directly to an output circuit without the intervention of relays. Selective control is provided for establishing the relay output signal in a latched or holding mode or in a controlled time momentary closure mode. In the momentary closure mode the time is established by a data controlled counter.

Abstract: The beam of a line scan fiber optics cathode ray tube is intensity modulated and is repeatedly swept along the fiber optics strip of the tube by a horizontal deflection coil to place on a transversely moving record sheet recorded gray scale images which are representative of received data signals. A sheet velocity sensor, a frequency to voltage converter, and a differentiator produce a voltage signal proportional to short term sheet velocity errors, and an integrator converts that signal into a signal which represents the time integral of each of such errors. The integral signal controls a vertical deflection coil for the tube so that each of the sheet velocity errors is accompanied by a movement of the cathode ray tube beam in the vertical direction, and hence along the path of sheet travel. This vertical beam movement maintains the instantaneous relative velocity between the sheet and the beam substantially constant notwithstanding the short term sheet velocity errors.

Abstract: A multipoint recorder has a multicolor ink cartridge arranged to be selectively aligned with a recording head having a plurality of selectively energizable recording elements whereby a color from the multicolor ink cartridge is selected for printing by the recording elements. A fixed color operation of the recorder enables a recording to be made in a single color by maintaining a preselected alignment of the recording head and a desired color in the multicolor ink cartridge. Alternatively, the color of the recording can be selectively altered at any time to produce a multicolor recording by selecting a corresponding color from the multicolor ink cartridge for each recording.

Abstract: A recording head for a multipoint recorder including a drum bearing a number of stylii regularly spaced around the drum periphery and rotatably mounted on an axle in a moving carriage sliding along a bearing bar mounted in the chassis of the recorder, means for rotational driving said drum means for temporarily displacing the drum in the direction of the strip chart and means for translational displacement of the carriage along the bearing bar with the means for rotational driving the stylii bearing drum has a Geneva cross rigidly connected to the drum and driven by a pin on a member wedged in a longitudinal nut in the bearing bar which is rotationally driven by a motor gear system mounted on the chassis of the device and that the means for causing the displacement of said recording head are formed by a cam rigidly connected to a gear wheel which meshes with a gear wheel of said pin bearing member whereby the cam is cooperating with an abutment of a housing supporting the stylii bearing drum and mounted on sa

Abstract: A digital frequency-lock circuit has a binary rate multiplier connected between a fixed frequency oscillator and an output terminal to modify the oscillator output signal in accordance with a digital word. An up/down counter is arranged to supply the digital word to the rate multiplier in accordance with a count stored in the counter. The frequency of the rate multiplier output is compared with an input signal frequency during a cycle of the input signal to maintain a predetermined relationship between the compared frequencies.

Abstract: A recording apparatus includes a modular cutter assembly. The cutter assembly includes a rotary cutter blade which is spring biased into uniform engagement with a fixed complementary blade. An actuating lever for the cutter blade also includes the additional feature of serving as a guide platen between the cutter and the subsequent drive means for a record member. Further as the actuating lever is operated to actuate the cutter blade, a soft loop is formed in the record member to accommodate the brief halt in the record member feed at the cutter position and a continuous feed of the record member by the subsequent drive means. The modular cutter assembly is so positioned in the drive system as to allow the system to be self threading and further so positioned as to be conveniently accessible to an operator of the apparatus.

Abstract: There has been provided, in accordance with the present invention, a recording system for light sensitive recording medium in which a latent image is developed by heating the photographic emulsion by means of a current passing through a conductive coating on the back of the record member. The record member is exposed to a light pattern to impose a latent image over a predetermined sheet length of recording medium. The recording medium is driven past the exposure station by a driving roller, a roller which may be the driving roller engaging the conductive back surface of the recording medium being grounded. The medium is driven past a shear mechanism to a clamp device. The clamp device grips the forward end of the record medium and serves as an electrode to pass an electrical current through the conductive back surface to the grounded roller to develop the latent image. The shear mechanism is then actuated to sever the sheet lengths. The clamp device then releases the severed sheets.

Abstract: A differential pressure to electrical signal transmitter has a pair of flat barrier diaphragms and a central control diaphragm located between the barrier diaphragms. First chambers between one of the barrier diaphragms and the control diaphragm, and a first length of capillary tubing connected between the first chambers and one chamber of a remotely located sensor capsule, are filled with a first incompressible fill liquid. Second chambers between the other barrier diaphragm and the control diaphragm, and a second length of capillary tubing connected between the second chambers and another chamber of the sensor capsule, are filled with a second incompressible fill liquid. The fill liquids are made to pump up their respective flat barrier diaphragms to cause the latter to have a dome shape and hence to be free from "oil canning." A chamber on the outside of one barrier diaphragm is pressurized with a first fluid, and a chamber on the outside of the other barrier diaphragm is pressurized with a second fluid.

Abstract: A magnetic record reproducing system preamplifier includes an inductive choke in the emitter circuit of a first stage transistor amplifier whereby to provide a frequency responsive variable input impedance whereby to maintain a proper impedance relationship between the inductive transducer and the input impedance of the first stage amplifier. A second stage transistor amplifier is connected to the output of the first stage amplifier in cascode relationship, reducing the effective voltage gain of the first stage to substantially zero. The choke in the input circuit of the first stage amplifier acts as a degenerative feedback at higher frequencies, effectively reducing the bias current through the first stage transistor. The base emitter capacitance of the first stage transistor tends to resonate with the inductance of the transducer. The effective degenerative feedback at that first stage transistor tends to push that resonant frequency beyond the desired or useful frequency band of the system.

Abstract: A method and apparatus for accommodating various sizes of molding die inserts in an injection molding machine using a pair of injection die insert support frames to hold either injection molding die inserts fitting directly into corresponding recesses in confronting faces of the die insert support frames or second injection molding die inserts combined with respective injection die insert adaptors fitting into the recesses in the die insert support frames. An adjustable stop for the confronting faces of the die supports is provided in a confronting face of one of the die insert support frames to maintain a uniform parting line between the die insert support frames and the die inserts by providing a selectively elevatable contact surface above the parting line facing surface of the one die insert support frame.

Abstract: A recording apparatus has accommodations for receiving and retaining a spindle for a roll or spool of recording media. The spindle is characterized in that it has a shoulder at one end constituting a stop guide for a roll of recording medium of a first width. The spindle is also provided with a retractable stop member which, when extended, comprises a stop guide for a roll of recording medium of a predetermined narrower width. The spindle is contoured to firmly engage the core of a roll of recording medium at about the mid point of the width dimension. The selected stop guides provide means for effectively centering either of the two widths of recording medium with respect to the spindle and, hence, the recording apparatus.

Abstract: A power limiting circuit for controlling recording electrode energizing power in an electrographic recorder having a plurality of electrographic recording electrodes has a voltage and current monitor circuit for detecting the changes in voltage and current being supplied to electrographic recording electrodes. The monitor circuit is used to maintain the current and voltage levels at predetermined reference levels by inhibiting the firing of preselected ones of the recording electrodes in a first and a second inhibit mode of operation. In the first inhibit mode, the firing of the even numbered electrodes is inhibited to maintain the predetermined power levels being supplied to the recording electrodes. The inhibiting operation is extended in the second inhibit mode to inhibit the odd numbered electrodes as well as the even numbered electrodes in alternate recording lines for a further limiting of electrode energization power to the recording head.

Abstract: A variable reference signal generating circuit concurrently generating a high and a low reference signal and an analogue signal comparator having hysteresis are used to compare an input signal with the high and low reference signals to determine the relative level of the input signal with respect to the limits defined by the high and low reference signals. The signal comparators are switching comparators with hysteresis which switch their outputs between high and low levels in response to the detection of a change in a relative magnitude between the input signal and the reference signals. For an input close to the switching threshold of a comparator, the comparator may maintain an output level indicative of a prior relationship between the input signal and the reference signal while the input signal has actually changed to a magnitude which should be represented by a change in the comparator output level.

Abstract: An analog output control circuit provides an arrangement whereby digital data from the control computer is supplied simultaneously to a number of output boards along with address data for selecting a particular one of the several boards. Logic control means is provided for responding to an address code for enabling the selected board. Additional control logic is provided for responding to control signals from the computer for selecting a particular one of the several output units included on the output circuit board. Control logic is also provided to prevent the output units from being changed in the absence of logic control or power supply.

Abstract: A poll command is sent by a central station to a plurality of remote stations connected along a data highway system. Upon receipt of the poll command, a remote station which desires to transmit data to the central station, responds with a reply pulse in a specific time position following the poll command. The position of the reply pulse is measured relative to the end of the poll command from the central station. Upon transmission of the poll command by the central station, a counter is started at the central station to count clock pulses arranged to occur at the end of each possible reply pulse position. Upon receipt of a reply pulse from a remote station, the count in the counter, which represents the binary address of the replying station, is stored in a memory and a memory address counter is incremented to control the storing of successive binary addresses in consecutive memory locations.

Abstract: A multi-input signal comparator and indicator circuit for comparing a plurality of signal levels with a reference level and an indicator circuit arranged to respond to a comparator output signal for indicating an error in any of the comparator input signals. A high and a low comparator is used for each input signal to provide a "window" comparison while separate indicators provide a readout of high and low errors.

Abstract: An improved multiplexer circuit features an addressing arrangement for effecting the selection, first, of the particular multiplexing module, then of an individual input from among the several inputs to the module. To this end, a latch assembly is provided for storing the address of the individual input to the module. Gating structure is provided, responsive to an address code for enabling the latch assembly to store the applied address code. An output switch is connected in the output circuit of the multiplexer module and operatively controlled by the selecting circuit to block any spurious output from the multiplexer module when the particular multiplexer is not selected.

Abstract: A square-wave signal generator circuit for generating a rectangular waveform signal particularly for application to the field coil of an electromagnetic flow meter. A coil excitation current from a direct current source is switched to provide a current flow in alternate directions through the field coil. During the transient time of the coil excitation current following the switching operation, a higher output voltage from the source is used to shorten the current rise and fall times while a lower voltage from the source is used during a steady state time of the excitation current to minimize power losses. A switching circuit using a switching transistor is used to select the higher voltage while a back-biased diode is used to immediately introduce the lower voltage when the excitation current has reached a steady state.