| 主权项 |
1. A machine for manufacturing from pre-forms each comprising a thin sheet of flexible material which has a pre-determined outline shape corner protectors for rectangularly-shaped frames, said machine comprising;
a. a work table which has a flat work surface, b. a first actuator for advancing a pre-form to a work station on said work surface of said work table, c. a second actuator for advancing a hold-down retainer bar over said pre-form, d. a pair of left and right, laterally opposed forming cylinders elevatable vertically underneath left and right sides of said pre-form by third and fourth actuators to thus bend vertically upwards left and right sections of said pre-form, e. a fifth, right rear oblique actuator for bending laterally inwardly between a rear vertical part of said right upright section of said pre-form, f. an adhesive applicator for applying an adhesive blob to one of a reverse side of a rear vertical part of said left upright section and an obverse side of said bent vertical rear part of said right upright section of said pre-form, g. a sixth, left rear oblique actuator for bending laterally rightward said rear vertical part of said left upright section of said pre-form and pressing said adhesive blob between obverse and reverse faces of said rear parts of said right and left upright section of said pre-form, h. a seventh, right front oblique actuator for bending laterally to the left and downwardly a right-had spring flap section from said right-hand upright section of said pre-form, i. an eighth, left front oblique actuator for bending laterally to the right and downwardly a left-hand spring flap section from said left-hand upright section of said pre-form, j. an ejector mechanism for ejecting from said work station a finished corner protector, and k. a pre-programmed controller for issuing control signals to said actuators to cyclically repeat steps defined in paragraphs (b) through (j). |
