Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Patent
1998-12-18
2000-12-19
Cherry, Johnny D.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
29743, B25J 1506, B65G 4791
Patent
active
061618861
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a component mounting head to which nozzle members for holding, e.g., electronic components to be mounted to circuit boards are freely attached/detached.
BACKGROUND ART
A conventional component mounting head will be described with reference to the drawings.
FIG. 8 shows a perspective view of the whole of a mounting apparatus. Nozzle members 2 for holding with suction electronic components to be mounted to circuit boards are attached at a front end part of a component mounting head 1. Each nozzle member 2 can be attached/detached to the component mounting head 1 in a one-touch operation. A nozzle station 3 provides nozzle members 2 in conformity with components to be mounted.
As mentioned above, while the nozzle members 2 can be freely attached/detached to the component mounting head 1, for this free attachment/detachment, three types (1)--(3) of component mounting head 1 have been proposed.
The structure of a mounting head and a nozzle member in a prior example (1) will be first described with reference to FIGS. 4 and 5.
In FIG. 4, a fitting part 4a of a nozzle member 4 is formed cylindrical and having an air path 11 thereinside. The fitting part 4a is detachably fitted at a front end part in a vacuum rod 5 along an axial direction of the vacuum rod 5. The nozzle member 4 fitted in the vacuum rod 5 is urged downward in the drawing by an urging force of a compression spring 17 stored in parallel to the axial direction in the vacuum rod 5 via a pusher 10. As indicated in FIG. 4, both a contact face 10a of the pusher 10 and a contact face 4b of the fitting part 4a are planar, so that the pusher 10 and fitting part 4a are held in facing contact with each other. The air path 11 is formed in the vacuum rod 5 and fitting part 4a to introduce the air of a negative pressure. A plug 407 is press-fitted at the contact face 4b to shut a hole used when the air path 11 is provided in the fitting part 4a.
The nozzle member 4 urged downward as in the drawing is retained in the vacuum rod 5 by a structure described below. Recess parts 401a, 401b of a suitable length are formed in an axial direction of the nozzle member 4 in an outer circumferential surface of the fitting part 4a. The recessed parts are separated approximately 180.degree. in the circumferential direction of the fitting part 4a. Steel balls 12a, 12b are pressed into the recessed parts 401a, 401b by means of compression springs 13a, 13b exerting an urging force in a direction orthogonal to the axial direction of the nozzle member 4. As shown in FIG. 5, when the steel ball 12a pressed into the recessed part 401a by the compression spring 13a contacts a side wall 403 of the recessed part 401a, a circumferentially rotational force in a counterclockwise direction is applied to the nozzle member 4. Meanwhile, when the steel ball 12b is pressed against a bottom face 402 of the recessed part 401b by the urging force of the compression spring 13b, the circumferential rotation of the nozzle member 4 by the above-described rotational force is restricted. In this construction, the nozzle member 4 is prevented from rotating in the circumferential direction unexpectedly. Moreover, since the steel balls 12a, 12b contact axial end parts 404, 404 of the recessed parts 401a, 401b , the nozzle member 4 is restricted from moving downward in the drawing and is maintained in the vacuum rod 5.
The structure of a mounting head and a nozzle member in a prior example (2) will be discussed with reference to FIG. 6.
A fitting part 14a of a nozzle member 14 is formed cylindrical, with an air path 11 formed thereinside. The fitting part 14a is fitted detachably at a front end part in a vacuum rod 15 along an axial direction of the vacuum rod 15. A torsion coil spring 19 is stored along the axial direction in the vacuum rod 15 so as to urge the nozzle member 14 in a circumferential direction of the nozzle member 14. A cylindrical shank 18 is set along the axial direction in the vacuum rod 15 between the torsion coil spring 19 and nozzle
REFERENCES:
patent: 3921971 (1975-11-01), Vollrath
patent: 4703965 (1987-11-01), Lee et al.
patent: 4705311 (1987-11-01), Ragard
patent: 4729713 (1988-03-01), Takaichi et al.
patent: 4860438 (1989-08-01), Chen
patent: 4950011 (1990-08-01), Borcea et al.
patent: 5755471 (1998-05-01), Bjorklund et al.
Furuya Hiroshi
Narikiyo Kazuhiko
Okuda Osamu
Uchida Kanji
Cherry Johnny D.
Matsushita Electric - Industrial Co., Ltd.
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