Pick and place machine

• US 5,564,888 A
• Filed: 09/27/1993
• Issued: 10/15/1996
• Est. Priority Date: 09/27/1993
• Status: Expired due to Fees

• Current Assignee: Carl V. Doan
• Original Assignee: Carl V. Doan
• Inventors: Doan, Carl V.
• Primary Examiner(s): Underwood, Donald W.
• Application Number:
  US08/126,986
• Time in Patent Office: 1,114 Days
• Field of Search: 414/733, 414/730, 414/782, 414/753, 414/783,752, 414/751,749, 414/738
• US Class Current: 414/751.1
• CPC Class Codes: B65G 47/902 provided with drive systems incorporating rotary and rectilinear movements
• CPC Class Codes: B65G 47/914 provided with drive systems incorporating rotary and rectilinear movements

Abstract

An improved pick and place machine works together with a part holding device to pick and lift a part out of a first station, shift to a second station, descend and release the part. An unique linkage system converts simple reciprocating motion from a fluid cylinder or the like into an inverted U-shape motion, providing a smooth, controlled acceleration, deceleration motion for the holding device. The machine has a carriage which is held upright by a sliding lever and which having a box shape, rum outside of a body enabling the part holding device to be mounted on the carriage.

Claims

1. A pick and place machine operable to pick up and lift a part out of a first station, move a predetermined distance, descend to place and release the part at a second station, comprising:

a. a top link (10) having two ends which reciprocates within predetermined stroke limits

b. a right upper link (12) having two ends and pivotally mounted at one end to one end of said top link (10)

c. a right lower link (14) having two ends pivotally mounted at one end to the other end of said right upper link (12) at an axis R

d. a left upper link (11) having two ends and pivotally mounted at one end to the other end of said top link (10)

e. a left lower link 13 having two ends and pivotally mounted at one end to the other end of said left upper link (11) at an axis L

f. a first follower (27) connected to said left lower link (13) and said left upper link (11) in the proximity of the axis L

g. a second follower (26) connected to said right lower link (14) and said fight upper link (12) in the proximity of the axis R

h. a first cam track (33) with a generally straight portion

i. said first follower (27) follows said first cam track (33)

j. said second follower (26) follows said first cam track (33)

k. a second cam track (34) having initial and terminal straight vertical portions interconnected by an approximately horizontal portion

l. a third follower (25) follows said second cam track (34)

m. a body (28)

n. a guided carriage

o. said third follower (25) connected to said guided carriage

p. said guided carriage slidable mounted on said body (28), and an orthogonal guidance means connected between the carriage and the body, whereby said carriage can translate, in an X Y plane but is prevented from tilting at any axis, and with a motion path determined by said second cam track (34) by means of said third follower (25)

q. the other end of said right lower link (14) pivotally mounted onto said guided carriage

r. the other end of said left lower link (13) pivotally mounted onto said guided carriage

s. said guided carriage includes a part holding means thereon, and actuation means to respectively grasp and release said part in said first and said second station in response to the movement of said guided carriage

t. an actuator means connected to the top link reciprocates the top link and moves the followers in the tracks.

2. The machine of claim 1, wherein said body is constructed of a front plate 1, a rear plate 2 and two spacers 3 and 35 positioned between the plates.

3. The machine of claim 1, wherein said orthogonal guidance means comprising:

a. a shaft attach to said body by an attaching means

b. a lever mounted slidable along and swingable about said shaft, whereby it is constrained from tiring about a Z axis

c. a link joining said lever and said guided carriage

d. said carriage slidable on said body, whereby it is constrained form tilting about X and Y axes comprising the XY plane, said lever and said link further constrain said carriage from tilting about the Z axis, while the carriage is still slidable in the XY plane.

4. The machine of claim 1, wherein said cam track 34 is in the form of an inverted U-shape.

5. A pick and place machine operable to pick up and lift a part out of a first station, swing a predetermined angle, descend down and place and release the part at a second station, comprising:

a. a top link (10) having two ends which reciprocates within predetermined stroke limits

b. a right upper link (12) having two ends and pivotally mounted at one end to one end of said top link (10)

c a right lower link (14) having two ends pivotally mounted at one end to the other end of said right upper link (12) at an axis R

d. a left upper link (11) having two ends and pivotally mounted at one end to the other end of said top link (10)

e. a left lower link (13) having two ends and pivotally mounted at one end to the other end of said left upper link (11) at an axis L

f. a first follower (27) connected to said left lower link (13) and said left upper link (11) in the proximity of the axis L

g. a second follower (26) connected to said right lower link (14) and said right upper link (12) in the proximity of the axis R

h. a first cam track (33) with a generally straight portion

i. said first follower (27) follows said first cam track (33)

j. said second follower (26) follows said first cam track (33)

k. a second cam track (34) having initial and terminal straight portions which form an angle interconnected by curves portion

l. a third follower (25) follows said second cam track (34)

m. a body

n. a guided carriage

o. said third follower (25) connected to said guided carriage

p. said guided carriage slidable and pivotable mounted on said body, and a non-linear guidance means connected between the carriage and the body, whereby said carriage can swing about a fixed axis FA, slidable toward/away from said fixed axis but constrained from tilting on any other axis, and with a motion path determined by said second cam track (34) by means of said third follower (25)

q. the other end of said fight lower link (14) pivotally mounted to said guided carriage

r. the other end of said left lower link (13) pivotally mounted to said guided carriage

s. said guided carriage includes a part holding means thereon, and actuation means to respectively grasp and release said part in said first and said second station in response to the movement of said guided carriage

t. an actuator means connected to the top link reciprocates the top link and moves the followers in the tracks.

6. The machine of claim 5, wherein said non-linear guidance means comprising:

a. a pivot lever pivotally and suitably mounted to said body by an attaching means

b. said carriage suitably mounted to said lever.

7. A linkage system to convert single axis motion into generally inverted motion, suitable to be used in pick and place machine, comprising:

a. a top link (10) having two ends which reciprocates within predetermined stroke limits

b. a right upper link (12) having two ends and pivotally mounted at one end to one end of said top link (10)

c. a right lower link (14) having two ends pivotally mounted at one end to the other end of said right upper link (12) at an axis R

d. a left upper link (11) having two ends and pivotally mounted at one end to the other end of said top link (10)

e. a left lower link (13) having two ends and pivotally mounted at one end to the other end of said left upper link (11) at an axis L

f. a first follower (27) connected to said left lower link (13) and said left upper link (11) in the proximity of the axis L

g. a second follower (26) connected to said right lower link (14) and said right upper link (12) in the proximity of the axis R

h. a first cam track (33) with a generally straight portion

i. said first follower (27) follows said first cam track (33)

j. said second follower (26) follows said first cam track (33)

k. a second cam track (34) having initial and terminal straight vertical portions interconnected by an approximately horizontal portion

l. a third follower (25) follows said second cam track (34)

m. the other end of said right lower link (14) pivotally mounted onto said third follower (25)

n. the other end of said left lower link (13) pivotally mounted onto said third follower (25)

o. output is attainable at said third follower (25)

p. an actuator means connected to the top link reciprocates the top link and moves the followers in the tracks.

8. The linkage system of claim 7, wherein said second cam track (34) is in the form of an inverted U-shape.