Glue head

Details Glue head Glue head

1998-05-11

2000-03-07

Shaver, Kevin

Dispensing

Resilient wall

Wall deflecting means

222333, 222504, 239DIG1, 239591, B65D 8854, B67D 300, B05B 100

Patent

active

060328320

ABSTRACT:
A glue head delivers lines or spots of glue onto a substrate, such as packaging materials, with precision positioning of the glue pattern, with short and balanced on/off compensation times essentially independent of glue pressure, and at high nozzle velocity. Pressurized glue advances into a plenum of the glue head preferably in a horizontal direction, then into a short and low-volume exit tube and through a nozzle, flowing in a direction perpendicular to the inflow direction. Flow to the nozzle is closed by a diaphragm valve comprising flexible elastomeric material which seats against the upstream end of the exit tube. An important feature is that glue actuator pressure is balanced, and smooth operation and glue delivery are achieved, by a rocker arm above the glue valve which, when the valve is closed by pushing the elastomeric material against the glue delivery tube, releases pressure on the glue at an upstream point in the glue plenum. The rocker arm works by opposed action at two bores into the plenum; when the valve is opened, the diaphragm at the upstream bore is pushed inwardly, and when the valve is closed the upstream bore diaphragm is allowed to push outwardly. This balances pressure on the rocker arm, so that only a light spring urges the valve toward closed and solenoid opening force is very light, and also provides volume compensation, balance and smoother operation without hydraulic hammering.

REFERENCES:
patent: 4852800 (1989-08-01), Murdock
patent: 4962871 (1990-10-01), Reeves
patent: 5405050 (1995-04-01), Walsh
patent: 5433351 (1995-07-01), Okuyama et al.
patent: 5479352 (1995-12-01), Smith
patent: 5620142 (1997-04-01), Elkas
patent: 5875922 (1999-03-01), Chastine et al.
Pafra Limited brochure, Direct Injection Glue Gun, 2 pp.
Pafra Limited brochure, Direct Injection 24 Glue Gun, 2 pp.
Pafra Limited brochure, Series 22MB glue gun, 2 pp.
Pafra Limited brochure, Series 88 glue gun, 2 pp.
Pafra Limited brochure, Series 86 gluing stations, 2 pp.
Pafra Limited brochure, Series 87 gluing stations, 2 pp.
hhs Leimauftrags-Systeme brochure, Glue Application systems, 2 pp.
hhs Vario-Jet system, Vario valves, 1 pg.
MPC 16 Business Form Gluing System, 1 pg.
Valco Cinn., Ltd., Pneumatically operated Glue vol. . . . , 1 pg. brochure.
Valco Cinn., 712/724 Glue Valve, 2 pg. brochure.

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