Abstract: The cleaning device includes a squeeze-bottle with a spout and a brush extending from the spout. A flow restrictor prevents cleaning fluid from being dispersed from the spout to the brush until the bottle is squeezed. The flow restrictor is formed simply by inserting the twisted wire handle of the brush into a tube forming the outlet of the spout. The length of the tube and the twisted wire can be selected to give the desired amount of flow restriction. The device is particularly well adapted for use in cleaning solder flux and other undesirable substances from printed circuit boards after they have been assembled. The cleaning device is relatively compact, inexpensive to make, and simple to use.

Abstract: Wire for repairing or changing circuit elements such as printed circuits, has heat-resistant insulation surrounded by a hot-melt adhesive. The wire is attached to the surface of printed circuit boards easily by applying a hot iron to the adhesive layer on the wire and melting the adhesive which then adheres to the board surface. The coating is applied by passing insulated wire vertically through a length of molten adhesive and then through a die. Printed circuit board modifications can be made quickly and easily and at a relatively low cost.

Abstract: Wire for repairing or changing circuit elements such as printed circuits has heat-resistant insulation surrounded by a hot-melt adhesive. The wire is attached to the surfaces of printed circuit boards easily by applying a hot iron to the adhesive layer on the wire and melting the adhesive which then adheres to the board surface. The hot iron has a tip with a groove in it so that when the iron tip is pressed onto the wire, the tip embraces the wire to melt the adhesive quickly and to make the bond relatively quickly. The coating is applied by passing insulated wire vertically through a length of molten adhesive and then through a die. A cleaner/holder device is used for cleaning the tip of a hot iron used for melting adhesive, or a soldering iron, and for holding the hot iron when it is not in use. The preferred cleaner is anti-combustion treated absorbent cotton string wound on a spool which is mounted in the holder, or adhesive tape with a soft clutch backing.

Abstract: In an automatic wire cutting machine a stepper motor driven knurled roller is positioned between two wire guide channels to drive a wire toward a cutting station. The length of wire to be cut is set in a length counter. Drive cycles, during which the wire is driven a predetermined distance, are counted in the length counter. Then, the stepping motor is disabled and cutting blade is energized. This system prevents operation of the cutting blade solenoid at less than an acceptable duty cycle with short lengths of wire. Due to the particular displacement of the wire with each step of the stepping motor, the system is readily converted from English to metric units.

Abstract: A plurality of circuit boards having male pin connectors are connected to a mother board having female pin receptor connectors, each circuit board being supported by a pair of grooved edge guide means. After the circuit boards are inserted into the device, a cover having a resilient foam pad on the inside surface thereof is closed wherein the foam pad resiliently presses against the upper edges of the circuit boards to hold them into position and maintain good electrical integrity with respect to the aforesaid connectors at the bottom portions of the circuit boards. Edge connectors may be plugged into the sides of the boards for further electrical access, and the heights of the edge guide means are high enough so that lower portions of the edge connectors are blocked and held in position by upper portions of the edge guides to prevent the edge connectors from being dislodged or loosened from the sides of the circuit boards.

Abstract: A plurality of outwardly and radially extending font segment support arms are coupled to a central hub which is rotated to sequentially present the letters formed upon the segments to an optical imaging station which selectively projects optical images of the letters upon a photosensitive medium. Vertical shoulder portions are precision machined upon outer portions of the radially extending support members for precisely positioning the arcuate character tracks on the segments with respect to the imaging station. Horizontal plates are affixed to the radially extending support members to support the segments against gravity and centrifugal force is employed to precisely seat the segments against the vertically oriented shoulder portions upon rotation of the hub.

Abstract: For variable letter sizes being photographically recorded in a second generation phototypesetter, it is desired to increase generated quantities of light flux produced by the flash lamp operating in conjunction with a font disc where larger letter sizes are thereby imaged upon the photosensitive medium, and conversely, to reduce such flux where smaller characters are to be projected. The disclosed system employs a digital letter size code for controlling the amount of charge inserted into a storage capacitor via a digital to analog converter and multivibrator. When the flash lamp is triggered at the appropriate time to selectively illuminate a given character, the energy associated with the stored charge is employed to energize the lamp.

Abstract: An optical sensor is positioned at the output of a variable magnification optical system which focuses differing character size images upon a photosensitive medium. A reference voltage, which is a function of the proper exposure for a particular photosensitive medium, is compared with the photosensor voltage. The system automatically tests for the correct light flux before each size change by projecting a reference image through the optical system at the photosensor, such image having a relatively low intensity level, so that no output signal is produced by the above-mentioned comparator. The intensity of the reference image is iteratively increased until such output signal is produced by the comparator, thereby to maintain the light intensity at the last level attained, until a character size change is effected, wherein the comparison process is repeated.