Carriage and rail assembly for a linear positioning system
A carriage and rail assembly for a linear positioning system includes a carriage mounted on a threaded screw member at least partially enclosed in a cylindrical housing.
This application claims priority under 35 U.S.C. § 119 and applicable foreign and international law of U.S. Provisional Patent Application Ser. Nos. 60/405,067 and 60/405,069 filed Aug. 20, 2002, each of which is hereby incorporated by reference in its entirety for all purposes.
This application incorporates by reference in its entirety the following U.S. patent applications and patents: U.S. patent application Ser. No. 09/578,806 filed May 24, 2000 entitled “Automated Fence Control Coupling System”; U.S. patent application Ser. No. 09/861,231 filed May 17, 2001 entitled “System and Method of Marking Materials for Automated Processing”; U.S. patent application Ser. No. 10/104,492 filed Mar. 22, 2002 entitled “Automated Fence Control Coupling System”; U.S. Provisional Patent Application Ser. No. 60/405,068 filed Aug. 20, 2002 entitled “Process Management System and Method”; and U.S. Pat. Nos. 491,307; 2,315,458; 2,731,989; 2,740,437; 2,852,049; 3,994,484; 4,111,088; 4,434,693; 4,658,687; 4,791,757; 4,805,505; 4,901,992; 5,251,142; 5,443,554; 5,444,635; 5,460,070; 5,524,514; and 6,216,574.
FIELD OF THE INVENTIONThe invention relates to devices for controlling linear movement of an object such as a fence on a table saw. In particular, an aspect of the invention involves movement of a positioning carriage along a guide rail, and related assemblies.
BACKGROUND OF THE INVENTIONSignificant 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.
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.
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.
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 accuracy criteria.
SUMMARY OF THE INVENTIONThe invention provides automated fence positioning systems that quickly and accurately reposition a fence in the course of executing a pre-determined cut or sequence of cuts on a table saw. An aspect of the invention utilizes a screw member substantially enclosed in a cylindrical housing. The housing has a longitudinal opening and a guide rail structure adjacent the opening. A carriage is mounted on the screw member and configured to travel back and forth along the guide rail structure. The carriage is rigidly coupled to a fence structure so that rotation of the screw member results in translation of the carriage and associated fence structure.
BRIEF DESCRIPTION OF THE FIGURES
Examples of the invention include numerous aspects and permutations. A preferred rail and carriage assembly implemented on a rip fence is described below with reference to
In
In operation, cylindrical portion 60 is contained in housing 34 where it moves along screw 42 as it rotates. Flange portion 51 extends through longitudinal opening 80 so that T-slots 64, 66, and 68 are positioned outside housing 34 to receive rail structure 55, bolts securing fence structure coupling device 40, and bolts securing plate member 57a, respectively.
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 including a threaded rod substantially enclosed in a cylindrical housing having a longitudinal opening adjacent a T-shaped track,
- a carriage configured to move back and forth along the rail assembly, the carriage having a threaded portion mounted on the rod, and a flange portion extending through the opening to the outside of the housing, the flange portion having a first T-slot configured to permit smooth sliding of the carriage on the T-shaped track of the housing, and
- a rigid coupling device connecting the carriage to the fence structure so that movement of the carriage along the threaded rod causes corresponding movement of the fence structure.
2. The system of claim 1, wherein the only contact between the rail assembly and carriage is along the T-shaped track.
3. The system of claim 1, wherein the flange portion has a second T-slot for attaching the coupling device to the carriage.
4. The system of claim 3, wherein the coupling device is attached to the carriage at least at two points.
5. The system of claim 4, wherein the two points define a line substantially parallel to the direction of fence structure movement.
6. The system of claim 3, wherein the flange portion has a third T-slot for attaching an interlock device capable of preventing operation of the saw when the carriage is moving.
7. The system of claim 1, wherein the housing has one or more external longitudinal T-slots for attaching the housing to other structures.
8. The system of claim 1, wherein the first T-slot has low friction material on an inner side of the slot for minimizing friction between the T-shaped rail and first T-slot.
9. A linear positioning system for guiding a rip fence structure on a table saw comprising
- a rail assembly including a threaded rod substantially enclosed in a cylindrical housing having a longitudinal opening,
- a carriage configured to move back and forth along the rail assembly, the carriage having a threaded portion mounted on the rod, and a flange portion extending through the opening to the outside of the housing, and
- a rigid coupling device connecting the carriage to the fence structure so that movement of the carriage along the threaded rod causes corresponding movement of the fence structure.
10. The system of claim 9, wherein the housing has a T-shaped rail adjacent the opening.
11. The system of claim 9, wherein the flange portion of the carriage has a first T-slot configured to permit smooth sliding of the carriage on the T-shaped track of the housing.
12. The system of claim 11, wherein the flange portion has a second T-slot for attaching the coupling device to the carriage.
13. The system of claim 9, wherein the coupling device is attached to the carriage at least at two points.
14. The system of claim 13, wherein the two points define a line substantially parallel to the direction of fence structure movement.
15. The system of claim 11, wherein the T-slot has low friction material on an inner side of the slot for minimizing friction between the T-shaped rail and first T-slot.
16. A linear positioning system for guiding a rip fence structure on a table saw comprising
- a rail assembly including a threaded rod substantially enclosed in a cylindrical housing having a longitudinal opening adjacent a T-shaped track,
- a carriage configured to move back and forth along the rail assembly, the carriage having a threaded portion mounted on the rod, and a flange portion extending through the opening to the outside of the housing, the flange portion having a T-slot configured to permit smooth sliding of the carriage on the T-shaped track of the housing, wherein the only contact between the rail assembly and carriage is along the T-shaped track, and
- a rigid coupling device connecting the carriage to the fence structure so that movement of the carriage along the threaded rod causes corresponding movement of the fence structure.
Type: Application
Filed: Aug 15, 2003
Publication Date: Apr 27, 2006
Inventor: Spencer Dick (Portland, OR)
Application Number: 10/642,350
International Classification: B26D 7/06 (20060101);