Model 353637E is a gantry with overhead ways and a moving bond head that brings the bonding function to the work and leaves the material handling process flow under customer control. It uses the full 2400B Series software to locate and bond automatically fine wire connections arrayed over a large, stationary work piece. There is no limit to the size of the work as this machine is entirely above the bond plane. The area traversed for bonding is five and three-eights by nine and one-half inches for all bond methods.

This Model Series differs from its companions, 3500E and 3700E, in that it is User-convertible to combine the functions of both. Series 3500E is already convertible as Model 3536E to perform wedge bonding with both angled and vertical feed: Now Model 353637E of this Series adds conversion to ball bonding. Since the wedge bond head is non-rotating, limiting the two wedge bonding methods to front-to-back applications or to work pre-rotation, ball bonding can restore the ability to proceed in all directions.

The wedge-wedge bonding method accepts aluminum wire, or gold wire with work piece heat. The primary wire feed method through angled clamps can be converted by exchange of clamp assemblies to vertical-feed wedge bonding for deep-walled work packages. This machine is intended to bond groups of parallel wires on work pieces pre-aligned for front-to-back bonding. Quality expectation is high with missing wire detection that functions without work contact, and with on-screen presentation of bond progress via a second, side-view camera.

The ball bonding method uses gold wire, requires work piece heat, and adds negative EFO ball termination. Missing ball detection and visual inspection again enhance quality control.

Bonding proceeds along a programmed path to all targets across the bond area; locating each target by Pattern Recognition and correcting for placement error. Programming of the work path makes use of the fully developed and richly featured software from West Bond’s Model 2400B running under Windows. Interface is by keypad, mouse, and large LCD color display.

Tool transport mechanism is constructed of three axes, straight-line and orthogonal, all driven by stepper motors in micro-step mode under program control. The long "X" and "Y" axes are moved via lead screw, and the "Z", by a linear spiral cam. A fourth motor drives the Patten Recognition camera assembly in "Z" direction for focus; and a fifth, sets force for each bond by varying the initial compression of a force counterbalance spring. A sixth motor on the wedge bond head is programmed to move either angled or vertical wire feed-clamps about the forward pivot to terminate and feed wire. The same vertical feed clamps are actuated on the ball bond head by the "Z" motor at stroke end. The transducer and clamp assemblies on both heads are mounted on a four-bar linkage that does not bear the weight of any motor. Wire is drawn from a spool by the clamps and is fed to the tool for wedge bonding, and to the torch for ball bonding.

All movement ways are hardened and ground vees with crossed rollers. The lead screws are positioned outside the ways, so to be accessed for maintenance without disassembly. Fine accuracy is assured by closed-loop feedback to the motor controls from an optical encoder system with glass scales and laser sensors mounted within the X- and Y-Axes.

Range for all bond methods is determined by the placement of the alignment camera forward of the tool, where it is required for wedge bonding.

Note that nominal work elevation is 5.000 inches above the table surface, and that in all configurations the tool descends at maximum range to 4.875 inches, an over travel of 0.125 inch. The adjustable work platform has a vertical range of 0.625 inch to set actual work contact elevation.

Actuation of all clamp motion is through a follower on the four-bar mechanism that rides on a motor driven cam mounted independently. Appropriate clamp motion settings for each method are configured in software and are retained in system memory. Motions toward the tool are spring-driven, while the more powerful motor drives away from the tool – to ease concerns during set-up.

Wire Clamps are air-opened and spring-closed, and have self-contained closure pivots. A forward pivot about an axis located to serve both overhead and angled-feed generates the clamp motions along their lines of feed action. To change between vertical-feed

and angled-feed, it is necessary only to exchange the small clamp assemblies and to change the wire drag means. Alignment of clamps to the tool is facilitated by individual adjustments along three axes.

Rigid bearing mounts, rather than taper loading, fix the strut bar of this assembly so that any required bond force can be applied. Bond Force is set to program values by a motor with spiral cam that adjusts the initial compression of the force spring. This force is opposed by a constant spring that serves to hold closed firing switch contacts until bond contact. Radiant tool heat with panel mounted, constant current control is included.

The bond head transducer and wire clamps depend from the "Z" axis slide by a four-bar linkage to keep the tool vertical and extendable to any position that tunes ultrasonically, and to reduce mass on the bond. In standard arrangement, a 0.750-in. capillary, dropped 0.656-in. below center, provides clearance of 0.406-in. above the work plane for work piece package walls.

Overhead wire clamps, air-opened and spring-closed, are standard throughout the D- and E-Series. They are actuated during the lift stroke to feed a wire length for balling. The negative EFO torch is driven at the home position to form the ball: Therefore, for ball bonding, it is this position that defines the bond stroke rather than the lower work position, and work elevation must be adjusted to control stroke length.

Bond Force is set to program values by a motor with spiral cam that adjusts the initial compression of the force spring. This force is opposed by a constant spring that serves to hold closed firing switch contacts until bond contact.

The ball bond tool assemblies of this series are built around K~Sine Transducer No. K~24-C operated at 63 kHz for low frequency, and Transducer No. K~34-C operated at 110 kHz for high frequency models, designated by the appended –30. Radiant tool heat with constant current control is included.

The mechanism of this series was designed to mount above a customer's work handling system, to be confined entirely above the work plane, and so not to require any base or work platform: Custom mounting brackets can be designed to join to customer’s mechanism. This configuration is designated by the appended "X", as Model 353637EX. For tabletop application, the standard model of this Series, Model 353637E, is without any work holder or temperature controller. The floor-standing configuration becomes Model 353637E-90 by the addition of Feature –90, Frame. In any configuration, the Industrial Computer CPU Chassis and West·Bond’s Power Supply Chassis are housed as separate components.

A motorized Wire De-spooler, Assy No 10055, for 2-inch spools, and which also includes side-view Television Camera Assy No 10110 with Polaris Model No. MB-1250 Camera, is mounted on the Y-Axis.

ESD protected Olympus Model SZ51-60 Microscope with 15X eyepieces and the new LED illuminator "Luxuray" are included. No other microscope has equivalent clearance to the bond head. This microscope is mounted on a folded linkage that allows it to be positioned to view most of the bond area.

The separate power supply enclosure holds motor and logic electrical power supplies, and also K~Sine Part No 6795, four Watts, dual channel ultrasonic power supply. Settings of power and time program values are sent via an eight-bit interface.

Protection against Electrostatic Discharge is implemented by finishing exposed tool assemblies and other moving parts by Electro less Nickel plating, which is conductive; and all exposed painted parts with a powder-coated paint that is dissipative.

• Model No. 353730E-90. This machine for 110 kHz, including Feature –90, Floor-Standing Frame.
• Model No. 353730EX. This machine for 110 kHz, but less Base, Adjustable Platform and Work Holder.

Compressed air, regulated to 50 psig, is required. Connection is via 1/4-inch tubing.

Electrical service required is 50-60 Hz, single phase, either 115 VAC or 230 VAC; however, input must be configured at the factory for 230 VAC. A fuse and three-prong power cord connector are provided for 115 VAC: For 230 VAC, these must be changed to conform to local requirements.

Machine dimensions are shown on the drawings below.

Weight is 410 lb. uncrated, or 450 lb. crated.