Abstract: A rinsing tank constructed to allow low volume water flow from an ingress point at one end of the tank to an outlet. Weirs are provided in the path of water flow to normally dam scum driven by the water flow yet allow passage of water. The rinsing water is, therefore, free of scum over a major part of its surface to permit immersion into and withdrawal from clear water of parts to be rinsed. Immersion of parts raises the water level in the tanks whereby scum dammed by the weirs can rise and pass over the weirs to the tank outlet.

Abstract: A tabular stop assembly having two sets of uniformly spaced tab stops for use with a typewriter with a dual pitch escapement wherein individual stops of each set are formed on each of an array of uniformly spaced C-shaped tabs which are mounted for rotative movement relative to a tab rack to first and second set positions corresponding to a selected escapement pitch.

Abstract: A fabric ribbon cassette wherein an endless folded fabric ribbon is drawn across the printing point of a typewriter or like machine by feed gears which are couplable to and driven by machine mounted feed gears which are also designed to feed cassette supported single pass or multistrike carbon ribbons.

Abstract: A conical compression spring having the characteristics of a cylindrical spring of much greater free length. The spring is characterized by wire whose diameter diminishes from base to apex end and by coils whose pitch diminishes from base to apex end such that the ratio of mean coil diameter to wire diameter is constant from coil to coil. Further, each coil diameter is preferably dimensioned to fit within the next larger coil permitting a spring to be designed which exhibits a small solid compressed height.

Abstract: A traveler for use on vertical textile yarn spinning or twisting rings. The traveler comprises two parts. A ring contacting part bears against the spinning ring as the traveler travels around the ring and a yarn contacting part engages the yarn as it passes from the feed rolls to the bobbin on which the spun yarn is wound. The ring contacting part is joined to the heat-conductive, yarn contacting part so that a substantial portion of its surface is exposed to the atmosphere. As the traveler spins around the ring, heat generated in the area where the yarn frictionally engages the yarn contacting part is conducted away from this area and is dissipated into the atmosphere due to the motion of the air past the exposed surface of the yarn contacting part. The yarn contacting area is thereby cooled.

Abstract: An error correction system for a typewriter in which a silent type action with a blank type face is operatively connected and synchronized to initiate a backspace action and elevate and feed an error correction ribbon in advance of the striking of the blank type face against the space wherein an error was printed. Thus, to obliterate an error and type in a correct character, an operator need only perform two operations; depress the error key and the correct character key. Further, in accordance with the invention, the error key may be further depressed to a repeat position whereby a series of characters may be obliterated automatically.

Abstract: A high-production, precision machine tool has means for varying the feed rate of the tool during the actual machining of each workpiece. The means comprise a plurality of program cams disposed on the camshaft of the machine tool for selecting the appropriate feed rate at the desired time during the machining operation. The camshaft is rotated by a permanent magnet D.C. motor, and as the camshaft rotates, the program cams, in turn, trip a plurality of switches to gate one of several predetermined voltage signals representative of the desired motor speeds to a comparator which compares the gated signal with the output of a tachometer measuring the actual motor speed. The difference, a voltage signal representative of the correction to be made to the motor, is applied to a silicon controlled rectifier firing circuit which selectively fires an SCR network, generating a shaped pulse to provide a controlled voltage input to the motor, thereby selectively controlling its speed.

Abstract: A normally engaged toothed cone clutch mechanism to allow disengagement of the platen of a typwriter from a line indexing ratchet wheel to enable rotation of the platen independently of the ratchet wheel includes a clutch member and a connection between the clutch member and the ratchet wheel. The connection takes the form of a spring washer secured to the clutch member and pins extending axially from the ratchet wheel toward the clutch member. The spring washer is formed to embrace and grip the pins to transmit rotary motion of the ratchet wheel to the clutch member without play yet allow axial sliding movement of the clutch member to disengaged position while maintaining its connection to the ratchet wheel.

Abstract: An improved printing ribbon for use between a writing electrode and a permeable counterelectrode across which a pulse of predetermined magnitude and duration is applied. The material of the ribbon is such that it experiences multiple electric breakdowns causing it to be propelled through the permeable counterelectrode onto a record sheet held adjacent the permeable counterelectrode outside the sandwich. In a preferred embodiment, the ribbon is provided with a metallized coating which serves as the permeable counterelectrode.

Abstract: A typewriter mechanism responsive to an operator-controlled key automatically inserts a sheet of paper between the platen and paper bail in preparation for printing by raising the bail as the platen-entrained paper advances with the platen and then restoring the bail when the paper has passed between the platen and the bail.

Abstract: A jam release control for a typewriter provided with a motor driven power train to rotate a power roll. The train includes a normally engaged clutch which can be momentarily disengaged by an operator when the power train is jammed thereby allowing the motor to come up to speed and develop torque as will overcome a jam incident to reengagement of the clutch.

Abstract: A single-element type carrier printing mechanism is provided with an element movable to block tangential deflection of the type carrier at printing impact with the platen, is normally disengaged from frictional contact with the type carrier during rotational positioning of the type carrier. The deflection blocking element includes a blocking arm pivotally mounted for free rotation relative to the type carrier, provided with an abutment adapted to act against a blocking surface formed on the type carrier. The blocking arm is also provided with teeth for detent engagement with a tilt detent device which moves the blocking arm from its normally disengaged position into engagement with the blocking surface to prevent impact deflection.

Abstract: A roll fed copier is provided with mechanism responsive to depression of a copy button to start or turn on power to the machine and thereby initiate the feed of copy paper from a supply roll and to cock a sprng-powered knife which is tripped by linkage operated by an adjustable copy length control on the movable original carrying platen. Additional mechanism is also provided to break the power lines to the machines if the copy button is not actuated for a predetermined interval.

Abstract: Disclosed herein is a thermoelectric printing method and apparatus pertaining to the technology which avoids the mechanical impact of printing elements upon an ink ribbon, as used in office machines or the like. In accordance with the method, an electrically insulating support of substantially two-dimensional perforated sheet material having two major surfaces, preferably glass fiber or nylon mesh material, is impregnated, in accordance with one embodiment, with electrically conductive printing ink, and, in accordance with another embodiment, with conductive ink in the form of pigment particles suspended in a dielectric binder. Then, by applying potential gradients or character signals across electrodes, sandwiching the support, one of which is permeable, ink is caused to transfer through the permeable electrode to paper or other recording material located outside the sandwich adjacent the permeable electrode.

Abstract: A textile spinning ring for use with a traveler having a yarn-engaging loop extending above a C-shaped ring-engaging traveler body, has means for preventing the yarn from becoming hooked under the traveler body rather than under the loop when the traveler is pieced-up in preparation for spinning. An annular flange configured to conform with the shape of the traveler extends inwardly from the body of the annular ring, the flange presenting a profile lower than the profile of the ring body. A low-profile bridge connects the flange with the ring body, and forms a recess which contains the ends of the traveler body. The flange, bridge and ring body are further configured and dimensioned so that the upper surface of the traveler body is substantially flush with the upper surface of the ring body when the traveler is resting on the flange.

Abstract: A top loading ribbon cartridge having a threaded ribbon guide for directing ribbon in the cartridge out of and back into the cartridge which is mountable on one side of a machine printing point. The threaded ribbon guide is movable relative to the cartridge from a retracted position away from the printing point to an extended position to expose ribbon in front of the printing point incident to typing actions. The movement of the ribbon guide is in a lateral direction which permits the mounting of a similar cartridge on the opposite side of the printing point which may contain error correction ribbon or ribbon of a different color in readiness for operation under operator control.

Abstract: A single element type carrier having type characters with different printing areas is impacted against a recording medium with different impact intensities substantially corresponding to the different printing areas to effect uniform printing. The type carrier is driven in a printing movement by a resiliently biased member which imparts an impacting force to the type carrier as the member moves along a path in response to the rotational movement of a cam. To control the impacting force imparted to the type carrier, one of a plurality of stop abutments is selectively positionable in the path of the resiliently biased member to control the length of movement along the path during which the member imparts an impacting force to the type carrier.

Abstract: A pilgrim step indexing mechanism provided with oppositely facing toothed ratchet wheels of the same pitch is associated with a single indexing pawl and an associated detent spring which not only detentably holds the ratchet wheels but also biases the indexing pawl to engage the ratchet wheels. The indexing pawl has two teeth one of which engages one of the ratchet wheels during a reverse stroke of the pawl to reverse feed both ratchets one increment and during a forward stroke of the pawl to advance both ratchets two increments. The ratchet wheels may be connected with a platen of a printer whereby a line of printwork, after printing, will be positioned two line spaces above the printing line for easy viewing.

Abstract: A device for installing an inking ribbon in the ribbon fork of a typing machine comprising a housing having spool locating means for receiving and locating a ribbon pay-off and take-up spool, a guide in the housing for cooperating with locating means on the typing machine for locating the said spools in their correct positions on the typing machine when the device is installed in position thereon, the housing having guide surfaces for folding the ribbon on its path from the pay-off spool to the take-up spool so that a portion of the ribbon is folded in such a manner that it can be introduced into guide hooks on the ribbon fork on the typing machine when the device is in position therein without the need for the installer to manually feed the ribbon through the ribbon fork.