초록 ▼

A can lid forming apparatus includes means for attaching a can opening key. A proximity field sensor is mounted in a doming die of the apparatus and generates a pulse logic signal as a can lid with a staked key is formed by the doming tool. A timing disc rotates in synchronism with each cycle of the

A can lid forming apparatus includes means for attaching a can opening key. A proximity field sensor is mounted in a doming die of the apparatus and generates a pulse logic signal as a can lid with a staked key is formed by the doming tool. A timing disc rotates in synchronism with each cycle of the tool and generates a pair of logic signals. A key monitor circuit is connected to respond to the signals to establish a latch, check latch and reset latch sequence for each cycle of the tooling. If the latch is not set, an appropriate output signal is generated indicating a key is missing from the lid. If the latch is not reset after being set, indicating a build-up of aluminum fines or the like on the probe, an appropriate signal is generated by a preconditioned probe monitoring curcuit. The latter is connected to respond to the pulse logic signal and the reset signal to continuously check on the generation of the output pulse of the probe and produce a stop or alarm output if the logic pulse signal is not formed; indicating a sensor malfunction of the absence of the key.

대표청구항 ▼

In a can lid forming apparatus having a cyclically operated tooling means for sequential forming of a series of metal keyed lids each having an outer metal key means, monitoring means for checking the presence of the key means, comprising a key sensor located within the tooling means and establishin

In a can lid forming apparatus having a cyclically operated tooling means for sequential forming of a series of metal keyed lids each having an outer metal key means, monitoring means for checking the presence of the key means, comprising a key sensor located within the tooling means and establishing a sensing field within the tooling means to produce a first output in the absence of the key means and a second output in the presence of the key means, said tooling means being operable to locate the key means in said sensing field during a sense portion of each cycle of the tooling means whereby a pulse signal is generated during each lid forming cycle, a check sensor means operable to generate a hold signal during the forming cycle of the tooling means including said sense portion of each cycle and a check signal at a selected non-sense portion of the forming cycle, latch means connected to said sensor and latched in response to said second output of said key sensor, and control means connected to said latch means and to said check sensor and providing an indication of the presence of the key means only in response to sequential operation of the latch means and the check means, a reset means connected to reset said latch means and including a reset sensor coupled to the tooling means and located to produce a reset signal at a predetermined position of the tooling means following the check signal of the check sensor, and a sensor state monitor means connected to continuously monitor the establishing of said first and second outputs and to generate an output signal in response to said second output during a selected non-sense protion of the forming cycle.