Carriage coupling device

Abstract

A positioning carriage is coupled to a fence structure by a rigid sheet having one or more bends around an axis parallel to the direction of fence structure movement.

Description

FIELD OF THE INVENTION

[0003] The invention relates to devices for controlling linear movement of an object such as a fence on a table saw. In particular, the invention involves an assembly for rigidly connecting a positioning carriage to a fence structure on a table saw.

BACKGROUND OF THE INVENTION

[0004] Significant effort and attention has been directed over the years at automating material handling and manufacturing. Ultimately, material processing equipment must be cost effective to manufacture and use. Therefore, innovation is needed to produce manufacturing equipment that is affordable, in view of its intended use, without sacrificing or comprising precision, accuracy, and overall functional performance.

[0005] Table saws may be equipped with a movable fence to allow an operator to set desired cut dimensions. Table saw fences typically are movable along a rail that is bolted along one side of the table saw. An operator may slide the fence back and forth along the rail and then lock the fence in place by means of a locking handle. Many such table saws are sold in a design that requires manual adjustment of the fence.

[0006] Sometimes it is desirable to use a table saw in an automated or semi-automated capacity. Digital positioning systems are available for adding on to a table saw that has a manually operable fence. Aftermarket automated fence positioning systems may be cumbersome to install. Some positioning systems are not flexible enough to be easily mounted on different table saw configurations. Thus, an object of the invention is to provide an automated fence positioning system that is easy to install and to adapt to different table saw designs.

[0007] Another object of the invention is to produce a table saw control system that is less expensive to produce compared to prior control systems, without compromising speed, precision, and specifications.

SUMMARY OF THE INVENTION

[0008] The invention provides automated fence positioning systems that quickly and accurately reposition a fence in the course of executing a pre-determined sequence of cuts on a table saw. An exemplary aspect of the invention utilizes a partially folded rigid sheet structure to connect a positioning carriage to a rip fence structure.

BRIEF DESCRIPTION OF THE FIGURES

[0009] FIG. 1 is a perspective view of an automated fence positioning system.

[0010] FIG. 2 is a partial cross-sectional view of the system shown in FIG. 1.

[0011] FIG. 3 is a close-up view of a coupling device shown in FIG. 2.

[0012] FIG. 4 is a partially exploded view of a rail section and a carriage device configured to move inside the rail.

DESCRIPTIONS OF EXAMPLES OF THE INVENTION

[0013] One aspect of the invention involves an assembly for rigidly connecting a positioning carriage to a fence structure. For example, a partially folded sheet member connects a positioning carriage to a fence or associated support structure. A preferred example of a coupling device implemented on a rip saw is described below with reference to FIGS. 1-4.

[0014] FIG. 1 shows a perspective view of an exemplary fence control system 20. Fence 22 is provided on a table saw to index a piece of material for cutting relative to saw blade 24. Fence 22 is connected to fence support member 26 which is slidably connected to fence positioning rail 30. Fence positioning rail 30 is coupled to positioning guide rail 34 via clamps or linkage devices 36a and 36b. Carriage coupling device 40 rigidly connects fence support member 26 to a carriage (shown in FIGS. 2-4) which moves inside positioning guide rail 34. Screw member 42 is driven by belt and pulley assembly 44 and a motor inside housing 46 to move the carriage along with carriage coupling device 40, fence support member, and fence 22 to properly position materials for cutting.

[0015] FIG. 2 is a cross-sectional view through the assembly of FIG. 1 showing the linkage between internal carriage 50 and carriage coupling device 40. A close-up view of the linkage is shown in FIG. 3. Carriage 50 has a cylindrical portion that has internal threads complimenting threads on screw shaft 42. The cylindrical portion of carriage 50 is contained entirely inside positioning guide rail 34. Carriage 50 also has a flange portion 51 that extends through slot 52 and runs substantially the entire length of positioning guide rail 34. Flange portion 51 includes three T-slots. One T-slot has anti-friction surface material 54 so that carriage 50 can move with a low coefficient of friction relative to T-structure 55 on positioning guide rail 34. Two other T-slots are provided. T-slot 56a receives one or more bolts for securing fence structure coupling device 40. T-slot 56b receives one or more bolts for securing interlock plate member 57a. Interlock device 57b is mounted on plate member 57a, and operates to prevent operation of the machine while the carriage is moving. The T-slot configuration shown in FIG. 3 provides a rigid, sturdy connection between carriage 50 and carriage coupling device 40, thus enabling carriage 50 to move smoothly on a single rail or guide structure 55 without contacting any other internal surface inside positioning guide rail 34. Therefore, the positioning system can operate with minimal friction making the device more efficient to operate and less expensive to produce compared to prior positioning systems. Alternative slot arrangements may be used. Other types of fastening devices, for example, bolts with nuts, soldered or welded connections, etc. may also be used.

[0016] In FIG. 4, a portion of positioning guide rail 34 receives carriage 50. Carriage 50 includes cylindrical portion 60 connected to flange portion 51. Flange portion 51 includes three T-slots 64, 66, and 68 for receiving T-structures or bolts, as discussed above and shown in FIG. 3. Collar members 72a and 72b are secured at opposite ends of carriage 50, and are provided with internal threads 74 complimenting external threads on screw 42.

[0017] The specific embodiments disclosed and illustrated herein should not be considered as limiting the scope of the invention. Numerous variations are possible without falling outside the scope of the appended claims. For example, the invention may be implemented in numerous different machine configurations with varying levels of automation. The invention may also be used to process many different kinds of materials including, but not limited to, wood, wood composites, polymeric materials such as PVC, polystyrene, polypropylene, polyethylene, fiberglass, textiles, etc. In addition to cutting, the invention may be used to carry out other processing steps such as bonding, sewing, heating, UV curing, painting or graphics application, etc. The subject matter of the invention includes all novel and nonobvious combinations and subcombinations of the various elements, features, functions, and/or properties disclosed herein.

Claims

1. A linear positioning system for guiding a rip fence structure on a table saw comprising a rail assembly, a carriage configured to move back and forth along the rail assembly, and a partially folded coupler sheet rigidly connecting the carriage to the fence structure.

2. The system of claim 1 wherein the carriage moves in a processing direction parallel to the direction of fence structure movement, the coupler having plural planer portions oriented parallel to the processing direction.

3. The system of claim 1, wherein the coupler has a top planer portion secured to a top side of the fence structure.

4. The system of claim 1, wherein the coupler has an opening through which a handle extends for manipulating an interlock that prevents simultaneous operation of the saw when the fence structure is moving.

5. The system of claim 4 further comprising an actuator connectable to the handle, and a plate member, the actuator being mounted on the plate member, the plate member being rigidly secured to the carriage.

6. The system of claim 5 wherein the coupler has plural planer portions, and the plate member has a main planer portion oriented perpendicular to the planer portions of the coupler.

7. The system of claim 1, wherein the rail assembly includes a substantially cylindrical housing containing a threaded rod, the carriage having complementing threads so the carriage moves along the rail assembly as the threaded rod rotates.

8. The system of claim 1, wherein the carriage has a T-shaped groove for receiving one or more bolt members fastening the coupler to the carriage.

9. The system of claim 5, wherein the actuator includes a hydraulic or pneumatic cylinder for driving the handle between locked and unlocked positions.

10. A linear positioning system for guiding a rip fence structure on a table saw comprising a rail assembly, a carriage configured to move back and forth along the rail assembly, and a coupler rigidly connecting the carriage to the fence structure, the coupler being formed of a metal sheet with one or more partial folds around an axis parallel to the direction of fence structure movement.

11. The system of claim 10, wherein the coupler is secured to the fence structure at least at two points.

12. The system of claim 10, wherein the coupler is secured to the carriage at least at two points.

13. The system of claim 11, wherein the two points define a line that is not perpendicular to the direction of fence structure movement.

14. The system of claim 13, wherein the two points define a line generally parallel to the direction of fence structure movement.

15. The system of claim 12, wherein the two points define a line that is not perpendicular to the direction of fence structure movement.

16. The system of claim 15, wherein the two points define a line that is generally parallel to the direction of fence structure movement.

17. The system of claim 10, wherein the coupler is secured to the fence structure at a first set of at least two points, and the coupler is secured to the carriage at a second set of at least two points, each of the first and second sets of points being substantially parallel to the direction of fence structure movement.

18. A linear positioning system for guiding a rip fence structure on a table saw comprising a rail assembly, a carriage configured to move back and forth along the rail assembly, and a coupler rigidly connecting the carriage to the fence structure, the coupler being formed of a metal sheet with one or more partial folds around an axis parallel to the direction of fence structure movement, the coupler being secured to the fence structure at a first set of at least two points, and the coupler being secured to the carriage at a second set of at least two points, each of the first and second sets of points being substantially parallel to the direction of fence structure movement.