Pick-station and feed apparatus in pick-and-place machine

• US 4,601,382 A
• Filed: 01/31/1984
• Issued: 07/22/1986
• Est. Priority Date: 01/31/1984
• Status: Expired due to Fees

• Current Assignee: Excellon Automation Co.
• Original Assignee: Excellon Industries
• Inventors: Roberts, William E., Nelson, Alfred M.
• Primary Examiner(s): Spar, Robert J.
• Assistant Examiner(s): Holmes, Jonathan D.
• Application Number:
  US06/575,559
• Time in Patent Office: 903 Days
• Field of Search: 414/131, 198/432, 198/474, 198/755, 198/690, 198/433, 198/421, 198/381, 198/619, 198/446, 198/463.5, 198/690.1, 221/212, 209/904, 209/907, 209/539, 193/32, 193/40, 271/226, 271/229, 271/193
• US Class Current: 198/432
• CPC Class Codes: H05K 13/028 Simultaneously loading a plurality of loose objects, e.g. by means of vibrations, pressure differences, magnetic fields
• CPC Class Codes: H05K 13/043 Feeding one by one by other means than belts

Abstract

A pick-and-place machine having magnetic elements which hold down the chips at the pick stations, thus preventing shingling, and also hold such chips at the pick stations adjacent a stop element. The magnetic elements create magnetic forces in two directions relative to chip elements having magnetizable terminal portions. The magnetic elements are provided in combination with feed apparatus that is adapted to stop, when the associated groove is full of chips, rather than causing the machine to jam.

Claims

1. In a pick-and-place machine that feeds chips in a row toward a pick station, said chips having magnetizable portions, a feeding and positioning apparatus for both positioning each chip at said station and preventing shingling of the chip at said station, said assembly comprising:

(a) means to feed chips in a row to a pick station from which said chips may be removed to a point of use,

(b) stop means formed of a magnetizable material at said pick station for stopping the forward chip thereat, and

(c) means for establishing a magnetic circuit adjacent said pick station in one path through said stop means and through the magnetizable portions of said forward chip for magnetically holding said forward chip in abutment with said stop means, and in another path for magnetically holding down at least the rear of said forward chip to prevent shingling, said means for establishing a magnetic field including a permanent magnet disposed adjacent said pick station and having a first pole piece in the vicinity of the rear of said forward chip and a second pole piece in magnetic circuit relationship with said stop means, said magnet being spaced below said stop means so that there is an air space to aid in shaping the magnetic circuit.

2. The invention as claimed in claim 1, in which means (a) includes means to define a groove for said row of chips, in which means are provided to vibrate the walls of said groove to effect vibratory feeding of the chips therein toward said pick station.

3. The invention as claimed in claim 2, in which means are provided to load said groove from a magazine of chips, said loading means being substantially jam-proof, said loading means exerting, when said groove is full of chips, a low force directed toward said pick station.

4. In a pick-and-place machine that feeds chips in a row toward a pick station, said chips having magnetizable portions, a combination stop and magnetic assembly for both positioning each chip at said station and preventing shingling of the chip at said station, said assembly comprising:

(a) stop means provided at said pick station for stopping the forward chip thereat, and

(b) a permanent magnet disposed adjacent said pick station, a first pole piece extending from one pole piece of said magnet to the vicinity of the rear of the forward chip, and a second pole piece including stop means formed of a magnetizable material extending from the other pole of said magnet to a region in advance of said forward chip, said magnet being spaced below said stop means so that there is an air space to aid in shaping a magnetic circuit through the magnetizable portions of said forward chip to;

1. magnetically hold down at least the rear of said forward chip to prevent shingling, and

2. magnetically hold said forward chip in abutment with said stop means.

5. The invention as claimed in claim 4, in which said first pole piece has a relatively sharp edge which concentrates the magnetic field in said magnetic circuit at a region relatively closely adjacent the rear of said forward chip.

6. The invention as claimed in claim 4, and further comprising a vibratory support to effect feeding of chips in a row toward said pick station, and in which said stop means (a) is fixedly mounted on said support.

7. A substantially jam-proof, compact pick-and-place machine that does not require logic circuits, said machine comprising:

(a) a support means defining parallel grooves,

(b) means to effect vibration of said support means to feed chips along said grooves from the rear end of said support means to pick stations at the forward end thereof,

(c) means to effect at least sufficient covering of said grooves to prevent substantial upward movement of the chips therein, said means terminating adjacent said pick stations so that said pick stations are not covered,

(d) means to load said groove with chips,

(e) stop means provided at said pick station for stopping the forward chip thereat, and

(f) a permanent magnet disposed adjacent said pick station, a first pole piece extending from one pole of said magnet to the vicinity of the rear of the forward chip, and a second pole piece including stop means formed of a magnetizable material extending from the other pole of said magnet to a region in advance of said forward chip, said magnet being spaced below said stop means so that there is an air space to aid in shaping a magnetic circuit through the magnetizable portions of said forward chip to;

9. The invention as claimed in claim 7, in which said means to load said grooves with chips comprises a row of magazines extending upwardly from said rear end of said support means in registry with said grooves, each of said magazines having a stack of chips therein, and further comprises means to unload said magazines into said grooves in substantially jam-proof manner, said unloading means comprising drive members, each of said drive members having a first position at which a stack of chips in the associated magazine is supported by the drive member against downward movement caused by gravity, each of said drive members having a second position not beneath the stack of chips in the associated magazine, but instead rearwardly adjacent a rearward chip which has dropped out of said magazine as a result of movement of said drive member, and in which means are provided to bias said drive members forwardly from said second position to said first position with a predetermined low force which is insufficient to effect jamming of the drive mechanism and is insufficient to cause shingling of the magnetically-influenced chips at the associated feed station.

8. magnetically hold down at least the rear of said forward chip to prevent shingling, andmagnetically hold said forward chip in abutment with said stop means.