Device for dispensing plastic fasteners

1. A device for dispensing an individual plastic fastener from a supply of fastener stock, the fastener stock being shaped to include a pair of continuous side rails to which are coupled a plurality of equidistantly spaced cross-links, the individual fastener comprising a pair of shortened cross-bars that are interconnected by at least one flexible filament, the device comprising:

(a) a head assembly adapted to receive the supply of fastener stock, sever an individual fastener from the supply fastener stock and eject the individual fastener during a single stroke of its actuation cycle, wherein the head assembly can be disposed between a first setting configured to dispense a single fastener from the supply of fastener stock and a second setting configured to dispense a double fastener from the supply of fastener stock, the double fastener comprising a pair of shortened cross-bars that are interconnected by at least two flexible filaments,

(b) a stepper motor for driving the head assembly through each head assembly actuation cycle, and

(c) an electronic controller programmed to regulate the number of strokes completed by the head assembly during each head assembly actuation cycle, the electronic controller being programmed to include single stroke, multiple stroke, and continuous mode actuation cycle settings.

2. The device as claimed in claim 1 wherein the controller regulates the application of power to the stepper motor.

3. The device as claimed in claim 1 wherein the controller is programmed to count the number of strokes executed by the head assembly during a period of time.

4. The device as claimed in claim 1 further comprising an externally accessible data port in electrical connection with the controller.

5. The device as claimed in claim 1 wherein the controller provides means for incorporating an optional delay between successive strokes of the head assembly actuation cycle when the controller is disposed in either its multiple or continuous stroke mode actuation cycle setting.

6. The device as claimed in claim 5 wherein the length of the optional delay between successive strokes is adjustable.

7. The device as claimed in claim 1 wherein the controller provides means for varying the speed in which the head assembly completes each stroke of its actuation cycle.

8. The device as claimed in claim 1 wherein the device is adapted to receive alternating current (AC) power from an input power source that falls within the range of approximately 90 volts and 250 volts.

9. The device as claimed in claim 8 further comprising a DC power switching supply in electrical connection with the controller, the DC power switching supply converting the AC power from the input power source to a designated direct current (DC) power level prior to its application to the stepper motor.

10. The device as claimed in claim 1 wherein the head assembly comprises,

(a) a head slidably coupled to a fixed mount, the head being driven by the stepper motor,

(b) a pair of hollowed needles fixedly coupled to the head, each of the pair of hollowed needles being shaped to define a longitudinal bore and a narrow longitudinal slot in communication with the longitudinal bore,

(c) a feed mechanism for advancing each side rail of the supply of fastener stock into direct axial alignment behind the longitudinal bore of a corresponding hollowed needle;

(d) a severing mechanism for separating an individual fastener from the supply of ladder stock, and

(e) an ejection mechanism for ejecting each cross-bar of the individual fastener axially through the longitudinal bore of a corresponding hollowed needle.

11. The device as claimed in claim 10 wherein each needle is mounted in a corresponding needle holder, the pair of needles being arranged such that the longitudinal slots for the pair of needles are disposed in-line with one another.

12. The device as claimed in claim 10 wherein the severing mechanism comprises:

(a) a flattened knife blade slidably mounted on the fixed mount; and

(b) a spring assembly for continuously urging the flattened knife blade in planar contact against the fixed mount.

13. The device as claimed in claim 12 wherein the spring assembly includes:

(a) a lever which is coupled to the head and which extends through an opening formed in the flattened knife blade;

(b) an enlarged stop formed onto the free end of the lever; and

(c) a spring axially mounted on the lever, the spring continuously urging the flattened knife blade in contact against the fixed mount.

14. The device as claimed in claim 1 further comprising a user interface in electrical connection with the controller, wherein operation of the controller is regulated using the user interface.

15. The device as claimed in claim 14 wherein the user interface includes a digital display panel and one or more control buttons.

16. The device as claimed in claim 1 further comprising an exterior housing which includes a recess that is sized and shaped to receive at least a portion of a reel of the supply of continuously connected fastener stock.

17. The combination of:

(a) a length of continuously connected fastener stock; and

(b) a device for dispensing an individual plastic fastener from the supply of fastener stock, the device comprising:

(i) a head assembly adapted to receive the supply of fastener stock, sever an individual fastener from the supply fastener stock and eject the individual fastener during a single stroke of its actuation cycle, wherein the head assembly can be disposed between a first setting configured to dispense a single fastener from the supply of fastener stock and a second setting configured to dispense a double fastener from the supply of fastener stock, the double fastener comprising a pair of shortened cross-bars that are interconnected by at least two flexible filaments.

(ii) a stepper motor for driving the head assembly through each head assembly actuation cycle, and

(iii) (c) an electronic controller programmed to regulate the number of strokes completed by the head assembly during each head assembly actuation cycle, the electronic controller being programmed to include single stroke, multiple stroke, and continuous mode actuation cycle settings.

18. The combination as claimed in claim 17 wherein the fastener stock comprises a pair of continuous side rails to which are coupled a plurality of equidistantly spaced cross-links.

19. A one-piece plastic fastener for use with a fastener dispensing device, the one-piece plastic fastener comprising:

(a) a first cross-bar of uniform transverse cross-section along the entirety of its length;

(b) a second cross-bar;

(c) a flexible filament extending transversely between the first and second cross-bars, the flexible filament comprising a first end formed onto the first cross-bar and a second end formed onto the second cross-bar;

(d) wherein the first end of the filament is branched so as to connect to the first cross-bar at two or more separate points of contact.

20. The fastener as claimed in claim 19 wherein the first end of the filament is bifurcated.

21. A one-piece plastic fastener for use with a fastener dispensing device, the one-piece plastic fastener comprising:

(a) a first cross-bar of uniform transverse cross-section along the entirety of its length;

(b) a second cross-bar;

(c) a flexible filament extending transversely between the first and second cross-bars, the flexible filament comprising a first end formed onto the first cross-bar and a second end formed onto the second cross-bar;

(d) wherein the first end of the filament is branched so as to connect to the first cross-bar at two or more separate points of contact;

(e) wherein the second end of the filament is branched so as to connect to the second cross-bar at two or more separate points of contact.

22. A device for dispensing an individual plastic fastener from a supply of fastener stock, the fastener stock being shaped to include a pair of continuous side rails to which are coupled a plurality of equidistantly spaced cross-links, the individual fastener comprising a pair of shortened cross-bars that are interconnected by at least one flexible filament, the device comprising:

(a) a head assembly adapted to receive the supply of fastener stock, sever an individual fastener from the supply fastener stock and eject the individual fastener during a single stroke of its actuation cycle, wherein the head assembly can be disposed between a first setting configured to dispense a single fastener from the supply of fastener stock and a second setting configured to dispense a double fastener from the supply of fastener stock, the double fastener comprising a pair of shortened cross-bars that are interconnected by at least two flexible filaments, (b) a stepper motor for driving the head assembly through each head assembly actuation cycle, and (c) an electronic controller for regulating both of the following stepper motor operations: the variable stroke speed that the stepper motor drives the head assembly through each head assembly actuation cycle and the number of strokes that the stepper motor drives the head assembly through each head assembly actuation cycle.