摘要:
A heating element for an infrared heater is made from an elongat e strip (1) of sheet metal such as nickel chrome. The strip (1) has a constant or varying cross-sectional area along its length, for example by having a non-uniform width, in order to provide an electrically resistive heating effect which varies along the length of the element. The strip (1) spans end mountings (2) and is energised by a voltage below 50 volts to provide long wave and medium wave infrared emission.
摘要:
A clamp (10) having a pneumatic cylinder (28) with an actuating rod (30) connected to one end of a drive arm (32) which has its other end attached to a crankshaft (19) which in turn has crankpins (20,22) eccentrically mounted thereon to drive inner and outer clamp arms (24,26) between retracted and advanced positions corresponding to open and closed positions of the clamp. The length of the drive arm (32), the extent to which the crankpins (20,22) are offset from the crankshaft (19), the specific portion of a quadrant through which the crankpins are rotated, and the distance between the application of the force to the clamp arms and the axes about which the clamp arms pivot all provide a significant mechanical advantage and an extremely large clamping force from relatively low pressure compressed air supplied to the pneumatic cylinder (28).
摘要:
A leadframe (L/F) processing apparatus includes a leadframe loading unit (1) placed along a loading transport passage of a leadframe for supplying a leadframe which has not undergone lead processing, a lead processing unit (2) coupled to the leadframe loading unit and having a plurality of sets of processing presses (41, 42, 43, 44), a leadframe unloading unit (3) coupled to the lead processing unit for removing a leadframe which has undergone the lead processing, and press pitch adjusting means (5) for freely adjusting press pitch (P) of a plurality of sets of processing presses in the direction of the leadframe loading transport passage. The processing apparatus accordingly makes it possible to easily and surely make adjustment with high precision to the pitch of a plurality of sets of processing presses provided to the lead processing unit according to the pitch of works on the leadframe without proficiency in manipulation.
摘要:
A thermal transfer printer comprises two parallel and adjacent print engines (1a, 1b), with each engine comprising a platen roller (4), a donor ribbon extending from a supply spool (10a, 10b) to a take-up spool (11a, 11b), and receiver supply rolls (5a, 5b) to hold a supply of receiver sheet. Drive means (11a, 11b; 26a, 26b) transport the donor ribbon and receiver sheet through the engine during printing independently from the drive means of the other engine. A printhead (3) has a row of heaters extending across both engines, with a first set (3a) of heaters positioned to operate with the first engine (1a) and a second set (3b) of heaters positioned to operate with the second engine (1b). Control means coordinate activation of the engines selectively with application of the image signal to the heater set which is operable with that selected engine. Both engines can be operated independently, enabling the printer to be set up for independent or dual printing.
摘要:
An autoclave type sterilization device which includes an autoclave sterilization chamber with an electrical heating arrangement mounted thereon. This electrical heating arrangement employs one or more positive temperature coefficient (PTC) thermistors as heating elements. These heating elements are in direct thermal and electrical contact on opposing sides, which are coated with a conductive metal such as aluminum, with electrodes to supply electrical current. These electrodes are, in turn, in direct thermal contact on their outward-facing sides with respect to the heating elements with plates which are formed of a thermally conductive and electrically insulating ceramic material such as AL 2 O 3 , and the plates are in direct thermal contact on their outward-facing sides with respect to the heating elements with heat radiation units which include heat transfer portions which are fabricated to engage and are in direct thermal contact with a portion of the wall of the autoclave chamber. The heating elements are positioned by an electrically and thermally insulating frame made of heat-resistant material which serves, together with the heat radiation units, to fully enclose the heating elements. The heat radiation units further are in thermal and mechanical contact with each other which, together with the abovementioned enclosure of the heating elements, protects them from thermal gradients due to unbalanced heat transfer or exposure to air or gas flow and hence, from the known "pinch effect."
摘要:
A cassette for a thermal transfer dye ribbon comprises a casing (1) containing bearing means (10) having rotably mounted thereon a cylindrical member (15) having on its periphery a mark (16) carrying information capable of being detected by a sensor on rotation of the member (15) and means operatively engageable with a drive source which is disposed outside the casing to cause rotation of the member.
摘要:
Apparatus for water treatment comprises a container with a removable lid member (6) providing access to a water treatment chamber (4). A filter medium, such as open-cell foam (26) is located within the chamber for filtration of water. The lid member (6) is adapted to engage the water treatment chamber (4) to provide a substantially water tight container, such that water may be passed through the filter medium at elevated pressure. An ultra violet emitter (42) is accommodated in a central flow tube (43) which is surrounded by the filter medium, to provide a compact pressurised apparatus.
摘要:
A gel for analysis of DNA samples by electrophoresis is accommodated in the channels of a wall structure (1) formed by an extruded plastics material such as that known as Correx. For electrophoresis treatment with the plastics wall structure (1) maintained vertical in an electrophoresis tank, the sample for analysis may be added to the open top of a channel partially filled with gel (6). The wall structure (1) may have a transverse removable strip (14) giving access to the gel-filled channels, for electrophoresis with the wall structure (1) horizontal.