Abstract:
A method of cleaning and flushing a fast-set material spray gun 10 is disclosed which uses, in the preferred embodiment, a mixture of approximately 62.5% DMSO, 32.5% DBE and 5% water. This mixture 12 is non-toxic when atomized and lowers the freezing point of the liquid to below 10° F. Because the solvent is mixed with the purge air and expelled from the gun in atomized form, it is important that a non-toxic solvent be utilized and also important that the freezing point of the mixture be low enough to allow use in colder climates without freezing.
Abstract:
A plural component spray gun (1) is designed for spraying quick setting materials such as foams, polyurea and the like. Towards this end, the gun (1) is designed so as to be easily serviceable with a minimum of tools. For example, the side seal cartridges (18) and (20) may be installed and removed without tools by removing the retaining ring (9) and then extracting them from the fluid housing (11). Those cartridges (18) and (20) are easily disassembled and cleaned. Similarly, the fluid housing (11) may be removed from the handle/body (1) by unscrewing the lock ring (7) by hand.
Abstract:
A plural component spray gun (10) is designed for spraying quick setting materials such as foams and the like. A mix module (14) plastic material provides at least twice the life with ½ the wear of currently marketed mix modules and is made of poly ether ether ketone reinforced with graphite and PTFE lubricants.
Abstract:
A spray gun is easily convertible between a number of configurations. A removable fluid insert may be placed in interchangeable (airspray and HVLP) spray heads with the fluid insert being either a pressure fed device which depends downwardly from the front end of the gun into a pressurized cup or via a connection to a pressurized fluid source or may have an upwardly directed insert which will take fluid from a gravity cup. A simple air swivel also adds ergonomic benefits.
Abstract:
A shuttle-actuated singulation apparatus (10) for use in handling integrated circuit devices (16). A shuttle (39), acting to isolate or singulate an individual integrated circuit device (16) for transfer to a test apparatus, is included. A shuttle assembly (30) is carried by a splined shaft (34) for rotational movement of shuttle (39) carried thereby. The assembly (30), additionally, is moved laterally by means of a drive cable (36). Rotation of a shuttle barrel (32) and associated upward pivoting of shuttle projectiles (42) carried by barrel (32) effects engagement of a bell crank (70) which, in turn, engages a belt drive mount (82) carrying a drive belt (80). The drive belt (80), thereafter, is engaged with an integrated circuit device (16) to impel the device (16) out of a track (12) in which it is received. The engagement of the shuttle projectiles (42) with a shoulder (72) of the bell crank (70) pivots the belt drive mount (82), thereby overcoming belt drive mount biasing spring (90) which normally retains the belt drive mount (82) in its original position. A stop (60) associate with each track (12) is also engaged by upward rotation of the shuttle projectiles (42). Engagement of the stop (60) by projectiles (42) overcomes stop biasing spring (62) to allow the belt drive (80) to push an integrated circuit device (16) out of the track (12) and into the shuttle assembly (30). The shuttle assembly (30) is then moved laterally to a position in alignment with a chute (18) and shuttle (39) rotated to a second position where the integrated circuit device (16) is expelled from the shuttle by means of a spring (48) into the common test site chute (18).
Abstract:
A paper feed system for a photographic printer which includes a motor driven takeup spool which pulls paper from a supply reel across a paper deck to the takeup spool. An encoder is turned by the paper, and provides encoder pulses which indicate incremental rotation of the encoder, and thus incremental movement of the paper. Prior to each paper feed cycle, a slow-down count is subtracted from a total feed length count to provide a high speed count. The motor is initially operated at high speed until the encoder has produced pulses equal to the high speed count. The motor is then switched to the low speed for the remaining portion of the paper feed corresponding to the slow-down count. During each paper feed cycle, the encoder pulses during the high speed portion of the paper feed are monitored to provide an indication of the average velocity of the paper during the high speed feed. The slow-down count for each paper feed cycle is a function of the average velocity from the previous paper feed cycle. As the takeup roll fills (i.e. its diameter increases), the paper velocity increases, and the slow-down count is increased to allow the paper the necessary time to equilibrate at the low speed prior to stopping the motor.
Abstract:
The neghold assembly of the present invention is used in photographic printers which do not have an automatic film advance system. The neghold assembly includes a transport base, a top insert holder, first and second aperture insert plates which are held in the transport base and the top insert holder, and a handle which is connected to the top insert holder. The first and second aperture insert plates are a set which have mating apertures which correspond to the desired film size. When a different size film is to be used, another set of first and second aperture insert plates having the appropriate size apertures are inserted.
Abstract:
A plural component spray gun (1) is designed for spraying quick setting materials such as foams, polyurea and the like. Towards this end, the gun (1) is designed so as to be easily serviceable with a minimum of tools. For example, the side seal cartridges (18) and (20) may be installed and removed without tools by removing the retaining ring (9) and then extracting them from the fluid housing (11). Those cartridges (18) and (20) are easily disassembled and cleaned. Similarly, the fluid housing (11) may be removed from the handle/body (1) by unscrewing the lock ring (7) by hand.
Abstract:
A serialization process presents an efficient method of creating serial numbers on a ceramic-like semiconductor wafer by forming a non-rigid photomask that incorporates character specifications for the serial numbers. The non-rigid photomask is retained in a rigid, optically transparent photomask holder that enables the photomask to be handled as a rigid structure. Upon preparation of the wafer, the serial numbers are created onto wafer dies using a combined process involving photolithography, and a reactive ion etching process with a selective etch rate. The serialization process enables a rapid creation of serial numbers, with the selective RIE process substantially increasing the optical contrast of the characters without the need for deep trenches and without generation of excessive debris.