Abstract: The method of obtaining the leather resides in the treatment of cattle hides and includes the following successively performed operations: pretreating a raw hide, splitting it longitudinally to the thickness of 2.0 to 2.5 mm of the leather tissue, flushing the thus obtained grain split in an aqueous solution containing surface-active agents and ferments, pickling, tanning, shaving, greasing, drying, rolling, stretching and grinding. All the above operations are performed with the hair remaining on the unfinished leather.As a result of the disclosed treatment there is obtained the leather with hair and with the suede finish of the flesh side. The leather is suitable for production of warm shoes, with the hair inside and no lining.

Abstract: A device for chemically treating leather and the like has a housing and a rotary drum. The housing has an opening opposite an open end of the drum. A double-walled door closes the opening and its interior communicates with a channel in the housing and with the interior of the drum, respectively.

Abstract: A pair of combination locks is employed to hold the lid of a luggage case cked closed, with a left-hand lock operating as a mirror image of a right-hand lock. Principal parts of the locks, including improved dial-indexing springs (but not the dials) are interchangeable. The dial-indexing springs cooperate with the dials of left-hand and right-hand locks in the same manner, so that all of the dials have the same action.

Abstract: A key retaining loop to be removably inserted in a key case is disclosed, the improvement consisting in the provision, on the legs of the openable loop, of wings, engaging snappingly a recess formed in a sleeve to be fastened to the key case. An alternative embodiment has the legs of the loop screw-threaded for engaging the internal tapping of the sleeve aforesaid.Simplicity and reliability of use are thus achieved.

Abstract: A power tool in the form of a fluid pressure cylinder utilizing multiple movable pistons coupled for contemporaneous pressure-responsive working movement, as well as for return to no-load position. Individual pressure buildup on each pressure chamber is controlled by pre-selected imput and exhaust orifice sizes for each chamber, which also permit better control of lubricant dispersal to the successively more remote chambers.

Abstract: A method for the determination of thermal properties by arbitrary heating, comprising the steps of measuring temperature responses at several points on a given sample, calculating Laplace integrals of the temperature responses and subjecting the integrals to the Laplace transformed heat conduction equation and thereby determining the thermal properties such as thermal conductivity, thermal diffusivity and thermal capacity.

Abstract: Apparatus and a method are disclosed for measuring the softening temperature of a specimen of a thermoplastic material such as glass. Pressure is applied through a rod to the specimen as the specimen is heated to at least its softening temperature. When the rod penetrates a predetermined distance into the softened specimen, the temperature of the specimen is measured.

Abstract: An electrically conductive metal is arranged within a passage for sodium having leaked, and the temperature change of the electrically conductive metal attributed to the heat of vaporization of which the sodium mist deprives the electrically conductive metal upon contact with the latter and subsequent vaporization is detected. The temperature change of the electrically conductive metal is detected in the form of a change in the current or voltage conducting property, and current corresponding to the temperature change is fed back to the electrically conductive metal. The change of the conducting property is taken out as a pulse signal, and a value proportional to the weight of a sodium mist particle is detected from the magnitude of the signal. Further, a value proportional to the weight of the whole mist is detected by the pulse height analysis. The leakage of the sodium is decided by comparing the value of the weight of the whole mist with a predetermined value.

Abstract: A smoothness absorbency tester for testing the porosity characteristic of an elongated porous strip of material. A movable surface is provided on a frame and is adapted to support thereon the strip to be tested. A drive mechanism is provided for driving the movable surface. A blade is provided on the frame and is supported for movement toward and away from the movable surface. The blade defines an upwardly opening reservoir with one wall of the reservoir being defined by the aforesaid movable surface having the strip of material supported thereon. A liquid dispensing device is provided for dispensing a liquid of a predetermined viscosity into the reservoir so that the liquid contacts the strip of material. The blade means prevents a run-off of the liquid in the direction of movement of the strip of material and thereby holds the liquid in the reservoir to be absorbed by the strip of material moving relative to the blade.

Abstract: A multi-axis load cell including a housing having a circular opening, a hub member having three radially extending arms is supported within the housing by a plurality of spring members and has a cylindrical portion located in the circular opening. A ring member forms a part of the housing and is provided with three circumferentially spaced posts each of which supports a screw connected to a spring member. The screw in each post is adapted to apply a radial force to the associated spring so as to achieve concentric positioning of the cylindrical portion relative to the circular opening. The housing also carries an adjustable force applier that engages the ring member for rotating the latter for achieving mechanical zero adjustment of arms formed on the hub member.

Abstract: Apparatus for monitoring weather conditions to determine when these can enable the commencement of an infection of mildew, comprising a temperature sensor producing an output signal if the temperature is above a predetermined threshold, a first rainfall sensor producing an output signal when it is not raining, and a second rainfall sensor producing an output signal when a predetermined amount of rain has fallen in a given time; coincidence of the output signals from these sensors is timed and if the coincidence lasts for a predetermined length of time a latch is set indicating that a primary mildew infection can have started. Further progress of the primary infection is monitored using other temperature and humidity sensors. For monitoring secondary mildew infections the second rainfall sensor is replaced by switching in one having a much lower threshold of rainfall, and the coincidence timing interval is changed.

Abstract: A fuel-gauging system has a capacitive sensor that is mounted in a fuel tank and supplied with an alternating electric signal from an oscillator. The oscillator output is supplied to a diode-pump circuit that produces a D.C. voltage proportional to the product of the amplitude and the frequency of the oscillator output. The D.C. voltage is supplied to the input of a comparator that receives a constant voltage at its other input. The comparator produces a D.C. output voltage, dependent on the difference between its inputs, which is supplied to an input of the oscillator, the oscillator being arranged such that the amplitude of its output voltage is dependent upon the amplitude of the input voltage. In this way, the product of the amplitude and frequency of the oscillator output is maintained substantially constant.

Abstract: A viewing tube extension for an infrared radiation pyrometer includes a tube having a heater therein. The heater has a passageway so that the pyrometer sights a glass ribbon moving through a forming chamber of a flat glass making apparatus. Vapors from the heating chamber moving into the tube are maintained above their dew point as a purge gas moves the vapors out of the tube.

Abstract: A gas sample conditioning apparatus is disclosed which is adapted for receiving pyrolysis gases from a hydrocarbon cracking furnace and providing a conditioned gas sample for on-stream process analyzers or the like.

Abstract: Methods and apparatus for the nondestructive testing of cement slurry samples as a function of time are disclosed. A sample placed in a temperature and pressure controlled autoclave is coupled to transducer means under computer control. Ultrasonic energy is propagated through the sample and the transit time is measured. A predetermined relationship relating transit time to compressive strength is employed and enables the determination of compressive strength. The measurements are repetitively performed on up to eight samples simultaneously and the time history of the development of compressive strength is recorded.

Abstract: A method and apparatus for inspection and control of threaded joint tightening processes by registering over the main part of the tightening process the momentary values of the torque delivered to the joint and the angular displacement of the joint and by comparing these values in a control unit with limit values of a narrow check range and a wider control range. Indicating lamps are arranged to be initiated in response to the check and control range limits being passed. In addition to the indicating lamps being initiated an output signal from the control unit may be used for discontinuing the tightening process as the control range limits are passed.By utilizing a computer for supervising the tightening process it is possible not only to store torque and rotation values registered during the process and make a later comparison with the predetermined limits but also to arrange those limits in non linear control and check ranges for use in plastic deformation tightening applications.

Abstract: A method of determining the volume flow of a fluid through a conduit usable with a single crystal, whereby at least one of the fluid and the conduit have energy-scattering interfaces. The method in one embodiment includes transmitting a known, uniform sound field through the fluid which illuminates the entire cross-sectional area of the conduit, obtaining the Doppler signal from the received signal such that the sampling region is normal to the direction of propagation of the sound field; and obtaining the integral of the power over this surface. A known volume of fluid totally within the conduit is then sampled for the reference power return therefrom and this reference power return is divided into the first moment of the power to produce a signal proportional to the volume flow of the fluid through the conduit.

Abstract: A gyroscope comprises a rotor driven by a motor shaft through the intermediary of an intermediate ring connected to the motor and to the rotor by torsion bars at 90.degree. with respect to each other and precession motors for applying to the rotor, precession torques in planes containing the axis of rotation of the drive shaft. Precession motors are fixed electromagnets exerting a force of attraction on the rotor. A system for supplying current to the electromagnets is provided, reacting to a control by an electrical control signal, this system having a response such that the attraction torque exerted by a pair of diametrically opposed electromagnets is a linear function of a parameter of the signal for controlling the current applied to the electromagnets.The gyroscope may have an elastic suspension and be intended to rotate at high speed.

Abstract: A ground wheel drive apparatus for producing rotational power to drive seed planters, fertilizer applicators or other devices of the type carried on a farm machine. The apparatus includes a fixed frame for mounting on the toolbar of the farm machine and that frame has a transverse drive shaft journaled thereon. A trailing frame is pivotably carried on the transverse drive shaft and has a ground engaging wheel journaled on its extending end. One end of the transverse drive shaft is coupled to the ground engaging wheel and the other end is coupled to the devices on the farm machine so that rotation of the wheel drives the transverse shaft which in turn drives the devices on the farm machine.

Abstract: A derailleur in which a movable member is freely movable in its forward movement in a given range with respect to a base member without being subjected to action of a return spring, whereby when a control wire is pulled by a control lever, the stroke of the pull-operation, over the free rotation range, allows the movable member to move forward and the movable member, at the terminus of its forward movement, is movable forward freely within the given range such that it may be pulled by the tension of a bicycle chain engaging with a sprocket to complete a partially completed shifting operation.

Abstract: The mechanism comprises at least one driving shaft and at least one driven shaft. A first pulley is keyed to rotate with the driving shaft and has a cheek which is fixed in translation and a cheek which is movable in translation relative to the first cheek. A second pulley is keyed to rotate with the driven shaft and has a cheek which is fixed in translation and a cheek which is movable in translation relative to the fixed cheek. A device is provided for controlling the displacement of the movable cheek of the first pulley. A transmission device extends around the first pulley and the second pulley. Radial elements adapted to be engaged in corresponding recesses in the transmission device are keyed to rotate with the driving shaft and the driven shaft between the cheeks of the first pulley and second pulley.

Abstract: Gear tooth profiles are disclosed that afford a higher torque capacity than that of previously disclosed fine-pitch gearing. To offset the weakness in bending of fine teeth, the transmitted force is divided among two to five times as many teeth as in conventional gearing, by using very low pressure angles, and the tooth interference that would occur between meshed involute teeth of equally small pressure angle is avoided by using profiles of shorter relative radius of curvature. The tooth flexibility needed to offset tooth separation at the ends of the line of action and to insure an equitable division of the load among the maximum number of teeth is obtained by deepening the dedenda. The resulting tooth form increases torque capacity by maximizing the transverse contact ratio and minimizes operating noise by increasing the axial contact ratio.

Abstract: The disclosed mechanical arm comprises a base having mounted thereon a plurality of pivotally connected links, each having its own individual motor operatively connected through driving kinematic chains with said links, and a tensioning mechanism including a tensioning member and kinematic chains connecting said tensioning member with the links; said tensioning mechanism being provided with differential gears in a number equalling that of said driving kinematic chains tensioned by said tensioning member, one output of each said differential gears being connected to said individual motor, and two other outputs thereof being connected to the preceding and successive ones of said differential gears; the two unoccupied outputs of the terminal ones of said differential gears being connected, respectively, to said base and said tensioning member.The invention is primarily intended for automation of main and auxiliary operations in various industries, e.g. for handling of production tools and equipment.

Abstract: A shift mechanism for the gears of a transmission is disclosed having a pivotally mounted member. The pivotally mounted member defines an aperture. A shift lever is rotatably positioned in the aperture of the member. A shaft is positioned in adjacent, spaced apart relationship to the member. A shift finger is pivotally and slideably positioned on the shaft. A first bracket is connected to the shift lever. The first bracket is adapted for drivingly engaging a portion of the shift finger and sliding the shift finger on the shaft, whereby the shift finger is moved to select a different gear. A second bracket is connected to the member. The second bracket is adapted for drivingly engaging a portion of the shift finger on the shaft, whereby the shift finger engages the selected gear.

Abstract: The hand control mechanism has the ability to receive two alternative modes of input for the given mode of output. The mechanism includes a handled lever extending into a housing rotatably mounted to a frame, and a bell crank rotatably mounted to said housing. The handled lever can be moved longitudinally to a first or second position. The first position communicates the lever to a plurality of gears such that rotating the lever about its longitudinal axis rotates the bell crank about the housing. Placing the lever in the second position the bell crank is restrained from rotating free of the housing which can be rotated directly by the lever, rotation of the bell crank being the assigned mode of output.

Abstract: A control device for a bicycle derailleur cooperates with a control lever to control the derailleur through a control wire and absorb a change in length in the wire. The control device includes a positioning plate which serves to position the lever and is supported relatively rotatably under resistance greater than strength of a return spring at the derailleur, with respect to one of the lever and a fixing member supporting the lever, and is made freely rotatable with respect to the other, so that during operation of the lever for changing the bicycle speed the positioning plate, when subjected to a wire tension over a predetermined value, is secured to the lever or fixing member and, when subjected to a tension less than the predetermined value, is allowed to be freely rotatable, thereby automatically absorbing a change of length in the wire.

Abstract: A multi-stage gear crank for a bicycle has chain detaching means facilitating disengagement of a driving chain from the teeth of sprockets, the detaching means being provided at teeth positioned in the vicinity of the upper and lower dead points of a larger diameter sprocket corresponding to the crank arms respectively, whereby the chain is adapted to be switched to a smaller diameter sprocket from the larger diameter sprocket at the upper dead point thereof.

Abstract: A hydromechanical drive comprises an input shaft connected to the input side of a hydrostatic transmission having an output side and comprising a pair of hydraulically interconnected hydraulic machines one of which is of variable volume to vary the transmission ratios between its input and output sides. A cam-type summing transmission has one input element connected to the output side of the hydrostatic transmission, another input element connected to the input shaft of the drive, and an output element connected to the output shaft of the drive. A brake is connected to the output side of the hydrostatic transmission for retarding same and thereby reducing the load on the hydrostatic transmission. This brake may be of the torque-converter type that applies increasing resistance to rotation as rotation speed increases.

Abstract: A control system for a power shifted transmission with a hydraulic actuated friction clutch incorporating hydraulic valves controlled by an electronic system responsive to a torque signal from an input or output shaft in the transmission, and including a torque level controlled by a computer stage in the electronic control.

Abstract: A socket wrench of improved design which not only provides for interchangeability but also for easy removal of the socket member. The ratchet and socket openings are provided in separate annular coaxial members. The ratchet wheel is adapted to loosely receive a removable socket insert. The periphery of the ratchet wheel is provided with a plurality of ball bearings which are mounted in openings which face inwardly toward the socket insert. The socket insert is provided with receiving structure for the ball bearings. A spring wraps around a portion of the periphery of the ratchet wheel and normally biases the ball bearings into locking engagement with the socket insert. The spring is provided with a portion spaced from the ratchet wheel which is actuatable to release the spring tension on the ball bearings, thus permitting the socket insert to freely drop out of the ratchet wheel.

Abstract: Apparatus for internally peeling metal tubes includes a peeling head rotatable about a longitudinal axis. An elongated cutter holder having opposite end portions is mounted on the head and extends generally parallel to the longitudinal axis of the head. One end portion of the cutter holder is mounted to the head by a pivot connection for providing swinging movement of the holder toward and away from the longitudinal axis of the head. Both of the end portions of the cutter holder are also adjustable outwardly and inwardly relative to the longitudinal axis of the head.

Abstract: Portable cutting apparatus is disclosed for turning either the outer peripheral surface of a cylindrical workpiece, such as a journal, or the annular end face of a tubular workpiece, such as the flanged mouth of a retort or the like. A hollow drum, which is rotatably driven around a fixed shaft, carries a change speed gear box for reciprocating a tool holder also carried by the drum. The tool holder is an interchangeable attachment for the drum and depending on the attachment used, the tool is movable in planes either normal to or concentric about the axis of rotation of the drum. The gear box is geared to the fixed shaft and therefore driven by rotation of the drum.

Abstract: A trailer mounted wood cutter and loader for cutting tree length material or logs into pulpwood, saw logs, and the like. The wood cutter and loader includes a framework supporting a plurality of conveying and feeding chains having outwardly extending concave log engaging latches thereon for receiving a tree length log and moving it transversely to feed the logs under a plurality of overhead saws with the cut lengths of logs free falling unto a loading conveyor. A spring loaded latch assembly is associated with the saws to catch or engage the tree length material prior to the saws engaging the tree length material. The chain mounted latches combined with the spring loaded latches and a slight upward incline of the conveying and feeding chains co-operate to prevent kickback of the cut length logs and to prevent binding of the logs in relation to the saws.

Abstract: A device attachable to a table saw mitre gauge, the device including a flat plate that adjustably bolts to the gauge so as to give a longer surface against which work is held and the flat plate supports an adjustable block against which an end of the work can be abutted for controlling a length of the work that is being sawed.

Abstract: A digital technique for triangular musical waveform generation is disclosed. A musical scale value corresponding to a selected note is repetitively added to produce an ascending series of non-consecutive numbers which is stored in a latch. A carry output from the limited modulus latch is used to switch a flip-flop which then enables an inverter to reverse the slope of the number series. Alternating reversals produce a rising and falling numerical staircase of controllable slope. This can be directly converted into a smooth triangular waveform, or alternatively it can be used as a series of memory addresses for table look-up purposes. The triangular waveform may be symmetrical, or it may have a controlled degree of asymmetry. Duplicate triangular waveforms with a small frequency mismatch may be used to produce a chorus effect. Or plural triangular waveforms with octavely related frequencies may be used as footages related to a single note, again with a slight frequency mismatch for chorus purposes.

Abstract: An improved thread tapping form is used to form an internal thread convolution in a member. The thread tapping form includes a plurality of projections which are disposed on a shank having a circular cross sectional configuration. Each of the thread forming projections includes a leading section which parts the material of the member to initiate formation of the flanks of the internal thread convolution. A side section of each thread forming projection presses against the flanks of the internal thread convolution to further form the flanks. A trailing section of each projection supports the side and leading sections of the projection.

Abstract: A removable anchor assembly has an elongated hollow tube including integral upper and lower portions with at least the lower portion exhibiting resilience to lateral deflection of segments of the walls thereof. The lower portion normally changes in a diameter progressively from near the junction with the upper portion, and the upper portion generally has predetermined internal and external diameters. Longitudinal slots are spaced around the lower portion, and a laterally facing ridge on the lower portion has a normal diameter related to the exterior diameter of the upper portion. A rigid plug is movable through the upper portion and has a diameter functionally the same as that of the internal tube diameter at the upper end of the lower portion. The plug is insertable within the lower portion to wedge the walls thereof outwardly and expand the ridge diameter to an enlarged amount.

Abstract: A multi-barrel rotary machine gun comprising a stationary internal shaft around which a drum carrying a plurality of barrels is rotatably arranged, a bolt assembly and locking mechanism is associated with each barrel, and the movement of each bolt assembly and its operation is dictated by a slot in the drum and a cam groove on the shaft.

Abstract: In order to use cases for firearms of various materials such: aluminum, (which is inexpensive), brass, iron and to facilitate use of greater pressure while insuring reliable operation of the gun, this invention proposes the use of divided holders fixed in the chamber (dies which are adjustable). These holders, after discharge of the cartridge, move back along with the case and the bolt, a very short distance, spread out, loosening the case. The case moves farther along with the bolt, and is ejected in regular manner. The bolt introduces the next cartridge into the chamber, etc.

Abstract: A fluid pressure operated servomotor such as a vacuum booster including a power piston having a differential pressure acting thereacross, an input rod for actuating a valve mechanism mounted in the power piston, a reaction lever disposed between the power piston and an output rod for transmitting a force to the output rod and transmitting a reaction force to the input rod. A return spring for urging the power piston in the return direction acts through the reaction lever on the power piston, whereby the reaction force is not transmitted to the input rod until the force transmitted to the output rod exceeds a predetermined value.

Abstract: There is disclosed a hydrostatic motor provided with radially arranged hydraulic cylinders provided with radial pistons composed of pairs of pistons with different diameters fitted one into the other. The motor is selectively operable in either of two operating conditions, in a first of which the large and small pistons move as a unit in a heavy duty operation, and in a second of which only the small pistons move in a low duty operation. The motor includes a rotor and a stator, duct means arranged in the stator for the supply of pressure fluid to the pistons, a change-over unit within the motor, and a fluid distributor unit housed in the stator. The motor of the invention employs virtually the same distributing circuits during its operation in both its heavy duty and its low duty modes of operation.

Abstract: A vacuum motor includes a cylindrical housing with a mount plate at one end and an end wall at its other end terminating in a guide tube. A stem, adapted for connection to an intermittently actuated vacuum source projects into and is secured to the mount plate and is adapted for securing to a support. A cylinder is nested within the housing open at one end and at its other end is axially recessed to define with the mount plate a first vacuum chamber communicating with the stem bore. A hollow reciprocal piston open at one end is sealed within the cylinder a and terminates in a tubular piston rod which projects outwardly of the guide tube adapted for connection to a load to be moved a predetermined distance. The interior of the piston defines with the cylinder a power air chamber communicating with the piston rod and atmosphere. The piston defines with the housing end wall a second vacuum chamber which is in communication with the first vacuum chamber.

Abstract: An apparatus to control the air flow in an automobile comprises a box which is provided beneath a seat and has openings respectively formed in the upper wall and the front wall thereof, a fan which is mounted to the rear wall of the box and of which the rotation can be reversed, a switching plate which is provided in the box in such a way as to selectively close the opening formed in the upper wall and the opening formed in the front wall, and a means to drive the switching plate so as to selectively open either one of said openings in synchronism with the switching of the rotation of the fan, thereby the air is forcibly upwardly passed through the seat or the hot air from a heater or the cold air from a cooler provided in front of the seat is forcibly sent rearwardly through said box.

Abstract: Disclosed is an apparatus for conveying gases into or out of a specific area while at the same time providing illumination for the area. A lamp housing is adjustably mounted in a cap which is attached to the free end of a gas conveying pipe. The cap widens from a relatively small cross section area to a substantially larger cross section area with the lamp housing movable at least between a position in which it completely blocks flow through the small cross-sectional area of the cap and a position which, while still completely within the confines of the cap, permits the flow of gas therethrough. Specific embodiments of the invention include one in which the adjustable mount is controllable from outside the cap permitting ease of gas flow adjustment therethrough. Because the lamp housing is entirely contained within the cap, it is protected from inadvertent damage during careless handling in its vicinity.

Abstract: A ceiling air outlet for a climate control system having a first outflow channel for receiving air and delivering it in a substantially horizontal direction from an outlet surface, a second outflow channel for receiving air and delivering it in a substantially vertically downward direction from the outlet surface, the first and second outflow channels having at their inlet ends a common air supply channel, and a damper mounted in the connecting region of the first and second overflow channels and the supply channel for automatically regulating the air flow into one of the outflow channels in response to the volume flow of air, the damper closing the outflow channel in response to lower volume flow of air and opening the outflow channel in response to higher volume flow of air, whereby the speed of the air delivered from the outlet surface is maintained at an adequate level.

Abstract: Process for reclaiming paint or a like material, which during the essentially horizontal spraying thereof does not land on the object to be treated, for reclaiming the respective part of the paint use being made of an approximately vertical wall, of which the upper edge is somewhat closer to the object to be treated than the lower edge, between the object and the wall an air stream being generated, which is directed essentially from top to bottom and which at its lowest point, under the lower edge of the wall, is bent off above a liquid bath, from which bath liquid is aspired, which at the upper edge of the reclaiming wall is brought thereon and runs down the wall, back into the liquid bath.

Abstract: A rotary baling machine for forming large cylindrical bales of cut crop material, such as hay which uses a conveyor belt and an oppositely moving containing belt means arranged to rotate the hay and form the bale in a baling compartment as the machine moves over the crop being harvested. The endless containing belt means surrounds the bale as it progressively increases in size and acts to compact the crop being baled to thereby form a bale of proper density. This containing belt means is trained over suitable elongated rollers which extend across the machine and thereby acts to rotatably drive the rollers. Power means are also provided, such as chain and sprocket means to also power drive the rollers. An overrunning sprocket is provided on at least one of the rollers so that possible over-loading or slack in the containing belt means which is caused by differential belt driving speeds, is eliminated.

Abstract: A truncated cone shaped guide extends downwardly from the imprinter of a conventional price marking stamp for guiding and locating the imprinter upon the top surface of a bottle cap.

Abstract: A postal meter includes a postal meter assembly adapted to be driven from a base, for in turn driving the drum of a settable printing mechanism. The meter has an electronic accounting system with a register, and means setting the register during the printing cycle. A mechanical latch is positioned to stop rotation of the gear assembly at a home position if an electronic accounting has not occurred during the previous printing cycle. The gear assembly further includes a cam surface for driving the mechanical latch to this position following initiation of a printing cycle. A detent has a tooth selectively engageable with a pair of notches on the lever corresponding to the two lever positions, the detent being displaced in one case by a cam surface of the gear assembly and in the second case by a lever system responsive to the operation of the accounting system.

Abstract: From the variables print hammer magnet voltage, print hammer magnet temperature, impact force, and a value derivable from the actual print time, a control voltage, which correspondingly delays an early trigger pulse by means of a variable delay element, is determined in an "open" control loop. The variables are analogously combined by adding, subtracting, and multiplying the analogue values, and by subsequently forming a weighted sum.