Solder dross removal apparatus

• US 5,087,356 A
• Filed: 05/16/1990
• Issued: 02/11/1992
• Est. Priority Date: 05/16/1990
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Webb, Winston S.
• Primary Examiner(s): Dawson, Robert A.
• Assistant Examiner(s): REIFSNYDER, DAVID A
• Application Number:
  US07/524,110
• Time in Patent Office: 636 Days
• Field of Search: 210/143, 210/523, 210/525, 210/528, 210/531, 210/923, 266/78, 266/228, 266/92, 15/250.17, 228/56.2, 228/34, 318/444
• US Class Current: 210/143
• CPC Class Codes: B23K 3/08 Auxiliary devices therefor cleaning pipes or tubes or systems of pipes or tubes, e.g. before soldering, B08B9/02

Abstract

An automatic dross removal apparatus (10) is disclosed for removing dross from the surface of a solder bath (22) in an automated electric component handling system. A rotatable wiper blade (14) is positioned adjacent the solder bath (22) which skims the dross off of the surface prior to the dipping of a robot conveyed component into the bath. An electronic control circuit (34) causes a motor (32) to rotate the wiper arm (14) one full rotational cycle each time a pulse is received from a robot controller (44) as a component approaches the solder bath (22).

Claims

1. Apparatus for removal of dross from a top surface of a bath comprising:

a) a pot containing a bath;

b) a rotatable wiper means positioned adjacent said pot so that said wiper means will skim the surface of said bath as the wiper means rotates;

c) motor means attached to said rotatable wiper means to rotate the same;

d) switch means disposed adjacent said rotatable wiper means and operable by said rotatable wiper means to disconnect power to said motor means once every revolution of said wiper means; and

e) means to override said switch means and supply power to said motor means in response to an element approaching said pot to be dipped therein.

2. The apparatus of claim 1 wherein said means to override further comprises:

a transistor switch disposed in a ground line for said motor means; and

,

an OR gate having an output connected to a base of said transistor switch, a first input connected to an output of said switch means disposed adjacent said rotatable wiper means, and a second input connected to a means for generating a pulse in response to an element approaching said pot to be dipped therein.

3. The apparatus of claim 2 wherein said bath is a said solder bath and said means to override operates in response to an electronic component approaching said pot to be dipped therein by an automated component handling system.

4. An apparatus for removal of dross from a top surface of a solder bath comprising:

a) a pot containing a solder bath;

b) a rotatable wiper means positioned adjacent said pot to skim the surface of said bath as the wiper means rotates;

c) motor means attached to said rotatable wiper means to rotate the same; and

,

d) a motor control circuit for said motor means including;

i) means to actuate said motor means in response to a signal pulse received from a robot controller indicating that an electrical component to be dipped in said solder bath is approaching said solder bath; and

ii) means to deactuate said motor means automatically after said rotatable wiper means has skimmed the surface of said bath once.

5. The apparatus of claim 4 wherein said means to deactuate said motor means comprises:

switch means disposed adjacent said rotatable wiper means and operable by said rotatable wiper means to disconnect power to said motor means once every revolution of said wiper means.

6. The apparatus of claim 5 wherein said means to actuate said motor means comprises:

a transistor switch disposed in a power line for said motor means; and

,

an OR gate having an output connected to a base of said transistor switch, a first input connected to an output of said switch means disposed adjacent said rotatable wiper means, and a second input connected to said robot controller for receiving a signal pulse in response to an electronic component approaching said solder bath to be dipped therein.