TWI675712B - Power tool with pyrotechnic lockout - Google Patents

Abstract

A power tool assembly includes: a workpiece support surface; and a latch that can be moved from a first position where a steering arm assembly does not extend above the workpiece support surface to a forming device on the workpiece A first latch position extending from a second position above the support surface to the steering arm assembly movable from the first position to a second latch position from the second position; an actuator A housing configured to receive the actuator device; and a reaction plug configured to selectively sit with the actuator housing, the reaction plug configured to act as an actuator When the device is installed in the actuator housing and the reaction plug is moved from an unseat position to a fully seated position, the reaction plug forces the actuator device to move the latch from the first latch The latch position is moved to the second latch position.

Description

Power tool with pyrotechnic latch

This application claims U.S. Provisional Application No. 62 / 132,004 titled "TABLE SAW WITH DROPPING BLADE" filed on March 12, 2015 and entitled "SYSTEM AND METHOD FOR CONTROL OF A" filed on March 12, 2015 "DROP ARM IN A TABLE SAW" has the priority of US Provisional Application No. 62 / 131,977, the disclosure of each of which is incorporated herein by reference in its entirety.

The present invention relates to power tools, and more particularly, to power tools with exposed forming devices.

Many power tools have been produced to facilitate forming a workpiece into a desired shape. One such power tool is a table saw. A wide range of table saws can be used for multiple purposes. Some table saws, such as cabinet table saws, are very heavy and relatively immovable. Other table saws, sometimes called site table saws, are relatively light. The site table saw is therefore portable so that workers can position the table saw at the work site. In making a table saw light enough to be movable, some accuracy is typically sacrificed. However, the convenience of having a table saw at a work site makes a site table saw very desirable in applications such as general construction projects.

All table saws, including cabinet table saws and site table saws, present safety concerns because the table saw blades are typically very sharp and move at high rates. So, for example, cut off fingers and deep Serious injuries to a wound can occur almost instantaneously. In response to the danger inherent in high-speed moving exposed saw blades, many different safety systems have been developed for table saws. One such safety system is a blade protection. The blade protector removably encloses the blade, thereby providing a physical barrier that must be moved before the rotating blade is exposed. Although the blade protector is effective in preventing some injuries, the blade protector can be removed by the user for convenience of the table saw, or because the blade protector is not compatible for use with a particular forming device. By way of example, the blade protection is typically not compatible with baseboard saw blades and must typically be removed when performing non-cut through.

Table saw safety systems have also been developed which are intended to brake the saw blade when a user's hand approaches or touches the saw blade. Various braking devices have been developed, including braking devices that are physically inserted into the teeth of the saw blade. However, after actuation of this type of braking device, the saw blade is typically destroyed due to the braking member. In addition, the brake members are typically destroyed. Therefore, whenever the safety device is activated, a lot of resources must be consumed to replace the saw blade and the brake member. Another disadvantage of this type of safety device is that the forming device must be toothed. In addition, if the spare saw blade and brake member are not at hand, the user must travel to the warehouse to obtain a replacement. Therefore, this type of security system can be expensive and inconvenient.

Another type of table saw uses a safety control system that moves the blade below the table level in response to a sense of unsafe conditions. One such system discloses U.S. Patent No. 8,286,537, issued on October 16, 2012. The '537 patent discloses a power tool including: a workpiece support surface; and a swing arm assembly that can extend along a first swing arm position extending above the workpiece support surface along a portion of a forming device supported by the swing arm assembly and The part of the forming device does not move in a swing path between the positions of the second swing arm extending above the workpiece support surface; and a latch pin which can be in a first position where the latch pin engages with the swing arm assembly With latch not with swing The arm assembly moves between the second positions engaged.

In general, the power tools in the '537 patent operate in a known manner until unsafe conditions are sensed by a safety control system. In response to the sensed unsafe condition, the safety control system controls the pressure operated actuator to force the latch pin from the first position to the second position and force the swing arm assembly away from the first swing arm position and toward the second Swing arm position.

In order to transfer power from the motor assembly to the mandrel when the steering arm assembly is used as a safety measure, a belt is used. The belt is typically required to exhibit increased strength in order to prevent stretching that adversely affects the operation of the tool. One common method of providing the required strength is to incorporate a metal or similar material into the belt. These belts exhibit electrical conductivity when providing the required strength. However, in some safety control systems, it is necessary to electrically isolate the mandrel from surrounding components and conductive belts prevent this isolation.

In view of the foregoing, it would be advantageous to provide a power tool with a belt electrically isolated from the mandrel. It would be further advantageous if galvanic isolation could be achieved when providing a mechanism for the alignment of the system.

In a specific example, a power tool assembly includes: a workpiece support surface; and a steering arm assembly that can extend above the workpiece support surface along a portion of a forming device supported by the steering arm assembly. A fall path movement between a first steering arm assembly position and a second steering arm assembly position where the portion of the forming device does not extend above the workpiece support surface; a latch which can be moved on the steering arm The assembly cannot move from the second steering arm assembly position to a first latch position of the first steering arm assembly position, and the steering arm assembly can be moved from the second steering arm assembly to the first One of the steering arm assembly positions to move between the second latch positions; an actuator housing configured to house the actuator device; and a reaction plug, which Configured to be selectively seated with the actuator housing, the reaction plug is configured such that when the actuator device is installed in the actuator housing and the reaction plug is from an unoccupied position When moved to a fully seated position, the reaction plug forces the actuator device to move the latch from the first latch position to the second latch position.

In one or more specific examples, the power tool assembly includes a biasing device configured to bias the latch toward the first latch position.

In one or more specific examples, the biasing device and the latch are configured such that when the reaction plug is moved from a fully seated position to a non-seated position, the biasing device applies force to the lock The register is opposed to the actuator device positioned inside the actuator housing, thereby moving the actuator device in a direction outward from the actuator housing.

In one or more specific examples, the actuator housing includes a slit on a motor side of the actuator housing configured to receive a portion of an actuator sleeve therein, and the actuator Movement of the actuator device in the direction outward from the actuator housing causes a portion of the actuator sleeve outside the actuator housing to be raised above a fingerboard portion of the actuator housing .

In one or more specific examples, the reaction plug is configured to threadably engage the actuator housing.

In one or more specific examples, the latch includes: a latch pin receiving area configured to receive a latch pin of the steering arm assembly; and a lower portion, which is located at Under the latch pin storage area, the lower portion is configured such that when the latch is in the second latch position, the lower portion is located in the drop path so that the steering arm assembly is from the first The movement of the two steering arm assembly positions toward the first steering arm assembly position causes the latch pins to contact the lower portion, thereby moving away from the second latch in a direction away from the first latch position. position Move the latch.

In one or more specific examples, the lower portion is configured such that when the latch is in the first latch position, the lower portion is located in the drop path so that the steering arm assembly is from the second The movement of the steering arm assembly position toward the first steering arm assembly position causes the latch pin to contact the lower portion, thereby preventing the steering arm assembly from further moving toward the first steering arm assembly position.

In one or more specific examples, the actuator device includes a pyrotechnic device.

In one or more specific examples, the power tool assembly includes a control system configured to actuate the actuator in response to a sensed unsafe condition.

In one or more specific examples, the power tool assembly includes: an electrical connector configured to connect to a plug of the starting device; and a connection wire including a permanent attachment at one end to One of the electrical connectors has a first end and is permanently attached to a second end of the control system.

In one or more specific examples, the connection wire extends through an opening in the reaction plug, and the electrical connector is sized such that the electrical connector cannot move through the opening.

In one or more specific examples, a method of operating a power tool assembly having a steering arm assembly that can be moved along a portion of a forming device supported by the steering arm assembly. A fall path movement between a position of a first steering arm assembly extending above a workpiece support surface and a position of a second steering arm assembly where the portion of the forming device does not extend above the workpiece support surface, the method includes: The actuator device is inserted into the actuator housing; a reaction plug is moved, and the reaction plug is configured to move from an unoccupied position to a fully seated position into which the actuator device is inserted and the actuator housing Selectively sit together; make the The actuator device moves a latch from the steering arm assembly from the second steering arm assembly position to the first steering arm by moving the reaction plug from the unseat position to the fully seated position. A first latch position of the assembly position is moved to the steering arm assembly is movable from the second steering arm assembly position to a second latch position of the first steering arm assembly position; and After the reaction plug is moved from the non-seated position to the fully seated position, the steering arm assembly is moved from the second steering arm assembly position to the first steering arm assembly position.

In one or more specific examples, forcing the actuator device to move the latch includes forcing the actuator device with a biasing device configured to bias the latch toward the first position. A bias is created to offset the latch.

In one or more specific examples, inserting the actuator device into the actuator housing includes inserting a portion of an actuator sleeve supporting the actuator device to a motor side of the actuator housing Inside a slit.

In one or more specific examples, moving the reaction plug from the unseat position to the fully seated position includes allowing a portion of the actuator sleeve outside the actuator housing to rest within the actuator housing. A position above a fingerboard portion moves downward.

In one or more specific examples, moving the reaction plug from the unseat position to the fully seated position includes threadingly engaging the actuator housing with the reaction plug.

In one or more specific examples, moving the steering arm assembly from the second steering arm assembly position to the first steering arm assembly position includes applying a latch to one of the steering arm assemblies. The pins move against the lower part of the latch in the second latch position, and move the second latch position in a direction away from the first latch position. A latch, and moving from the second latch position in the direction away from the first latch position After the latch, the latch pin is moved to a latch pin storage area of one of the latches.

102‧‧‧table saw

104‧‧‧ Wheeled Pedestal

106‧‧‧ base cover

108‧‧‧ Workpiece support surface

110‧‧‧Support surface extension

112‧‧‧Support surface extension

114‧‧‧ Fence

116‧‧‧ Splitter or separator

117‧‧‧ recoil claw

118‧‧‧Saw blade

120‧‧‧Saw blade protection

122‧‧‧ throat plate

124‧‧‧ Human Machine Interface (HMI) Unit

130‧‧‧ Angle indicator

132‧‧‧Slope adjustment lock

133‧‧‧Bevel clamp

134‧‧‧Slope

136‧‧‧height adjustment wheel

138‧‧‧ helical gear

140‧‧‧Threaded Rod

142‧‧‧height adjustment stand

144‧‧‧height adjustment lever

146‧‧‧height adjustment tube

148‧‧‧ opening

150‧‧‧ opening

152‧‧‧Threaded bush

153‧‧‧ Powder metallurgy bush

154‧‧‧ Powder metallurgy grooved bushing

160‧‧‧Motor Assembly

162‧‧‧Belt

164‧‧‧Offset drive shaft

166‧‧‧Motor end pulley

168‧‧‧ Power shaft

170‧‧‧ Gear

172‧‧‧Screw

174‧‧‧Mounting slot

176‧‧‧motor gear cover

178‧‧‧Motor mounted rotating shaft

180‧‧‧rotation axis

182‧‧‧Lifting screw

183‧‧‧rotation axis

184‧‧‧board

186‧‧‧board

188‧‧‧arrow

190‧‧‧arrow

192‧‧‧From the pulley

194‧‧‧steering arm assembly

196‧‧‧belt tension access port

198‧‧‧belt protection cover

200‧‧‧ orbital axis

201‧‧‧ Steering arm track axis

202‧‧‧Rotary shaft

203‧‧‧track bracket

204‧‧‧ Orbital shaft hole

205‧‧‧Alignment hole

206‧‧‧Anti-rotation groove

207‧‧‧Positioner pin

208‧‧‧Anti-rotation pin

210‧‧‧Screw

211‧‧‧ axis

212‧‧‧center axis

213‧‧‧Shoulder Screw

214‧‧‧ align pins

215‧‧‧bearing

216‧‧‧Track pin

217‧‧‧hole

218‧‧‧hole

219‧‧‧hole

220‧‧‧ fixed screw

221‧‧‧hole

222‧‧‧Shoulder

224‧‧‧Circular shaft lower part

226‧‧‧Circular shaft upper part

228‧‧‧ inside

230‧‧‧ angle

232‧‧‧Track bolt

234‧‧‧Inner bearing wall

236‧‧‧ Bracket

240‧‧‧ mandrel

242‧‧‧ Steering arm frame

244‧‧‧Spring Well

246‧‧‧Spring

248‧‧‧ flange

250‧‧‧ mandrel lock

252‧‧‧Start arm

254‧‧‧Locked ramp

256‧‧‧ mandrel groove

258‧‧‧Shoulder screw

260‧‧‧Guide groove

262‧‧‧Capacitive Coupling Board (CCP)

264‧‧‧ connector tab

266‧‧‧Screw

268‧‧‧CCP bracket

269‧‧‧Fixed Screw

270‧‧‧Lifting lips

271‧‧‧Long convex

272‧‧‧ orbit

273‧‧‧well

274‧‧‧ rebound wall shelf

275‧‧‧ rebound wall shelf

276‧‧‧pad

278‧‧‧ align pins

280‧‧‧ Hemispherical Impact Pin

282‧‧‧ latch pin

300‧‧‧ Latch

302‧‧‧pin

304‧‧‧ latch pin storage area

306‧‧‧fork tip

308‧‧‧Spring

310‧‧‧ Pills

312‧‧‧ pills

314‧‧‧Sleeve

320‧‧‧bridge

322‧‧‧Firework cover

324‧‧‧ Internal threaded chamber

326‧‧‧Mounting plate

328‧‧‧finger board

330‧‧‧Slit

332‧‧‧ round end

334‧‧‧throat opening

336‧‧‧ mandrel nut

338‧‧‧fall plane

340‧‧‧gravity

342‧‧‧Alignment cover

344‧‧‧finger ribs

346‧‧‧bolt

348‧‧‧pin

350‧‧‧ Fireworks Assembly

352‧‧‧electrical connector

354‧‧‧Connecting wires

356‧‧‧Reaction plug

358‧‧‧ opening

360‧‧‧ Lower part of latch

362‧‧‧ rib

364‧‧‧Locked ramp

366‧‧‧ cover axis

374‧‧‧ surface

376‧‧‧ rib

378‧‧‧ rib

380‧‧‧ rib

382‧‧‧ rib

384‧‧‧ lower surface

386‧‧‧ opening

388‧‧‧ axis

390‧‧‧ axis

392‧‧‧ axis

394‧‧‧ axis

396‧‧‧Location

400‧‧‧ springback latch assembly

402‧‧‧Lower latch

404‧‧‧ Upper latch

406‧‧‧pin

408‧‧‧ rebound surface

410‧‧‧Spring

412‧‧‧spring

414‧‧‧Bolt

416‧‧‧Reset leverage

418‧‧‧lip of lower latch

420‧‧‧ rib

422‧‧‧ rib

424‧‧‧ rib

426‧‧‧ rib

428‧‧‧ rib

430‧‧‧ opening

432‧‧‧ opening

450‧‧‧Saw control unit assembly

452‧‧‧Printed Circuit Board (PCB)

454‧‧‧Exterior cover

456‧‧‧Inner cover

458‧‧‧USB port

460‧‧‧ coaxial cable

462‧‧‧center conductor

464‧‧‧Shield

466‧‧‧ insulator

468‧‧‧outer plastic coating

470‧‧‧Location

472‧‧‧Location

474‧‧‧Location

476‧‧‧Location

478‧‧‧ stripped area

480‧‧‧ protective cover

482‧‧‧protective cover

484‧‧‧height adjustment lever

486‧‧‧ non-conductive front plate

488‧‧‧ Miter cut trunnion

490‧‧‧ trunnion block

492‧‧‧Plastic trunnion insert

496‧‧‧ powder metallurgy bracket

498‧‧‧Threaded Rod Bracket

500‧‧‧plastic bearing housing

501‧‧‧bearing

502‧‧‧Saw blade side

504‧‧‧Pulley side

506‧‧‧bearing unit

508‧‧‧plastic overmolded parts

510‧‧‧ rear bearing

512‧‧‧Saw blade washer

514‧‧‧Saw blade washer

520‧‧‧ core

522‧‧‧ intermediate core

524‧‧‧Shell

526‧‧‧Gasket

528‧‧‧Inner gasket lip

530‧‧‧Locking nut

532‧‧‧hole

534‧‧‧outer surface

536‧‧‧outer core surface

538‧‧‧Inner surface

540‧‧‧Dovetail Spline

542‧‧‧angle

580‧‧‧non-conductive intermediate core

582‧‧‧ core

584‧‧‧shell

586‧‧‧shell

588‧‧‧bearing

590‧‧‧bearing

592‧‧‧bearing

594‧‧‧bearing

596‧‧‧ Cover

610‧‧‧radial vent

612‧‧‧fan

620‧‧‧track

622‧‧‧track

624‧‧‧Isolated components

626‧‧‧Isolated components

628‧‧‧Isolated components

640‧‧‧ Insert storage area

642‧‧‧ Insert

646‧‧‧ protrusion

648‧‧‧ protrusion

650‧‧‧ knob

652‧‧‧Main part

654‧‧‧Stem

656‧‧‧ knob well

658‧‧‧spring assembly

660‧‧‧ finger hole

662‧‧‧lock cam

664‧‧‧lift cam

666‧‧‧Cam ramp

668‧‧‧ Knob recess

670‧‧‧arrow

674‧‧‧Narrow section

676‧‧‧notch

678‧‧‧arrow

680‧‧‧Saw blade wrench

700‧‧‧ Cover

702‧‧‧Access point

704‧‧‧Status indicator

706‧‧‧LED

708‧‧‧Printed Circuit Board (PCB)

710‧‧‧NFC antenna

712‧‧‧Support

714‧‧‧ spacer

716‧‧‧clip

718‧‧‧well

719‧‧‧ opening or aisle

720‧‧‧ diffuser

722‧‧‧lens

730‧‧‧ Dust port

732‧‧‧ Dust port access slot

734‧‧‧ Dust cover

736‧‧‧protective plastic or rubber plug

738‧‧‧ cover

740‧‧‧Anti-damage screw

The accompanying drawings illustrate various specific examples of the invention, and together with the description serve to explain the principles of the invention.

FIG. 1 depicts a top perspective view of a table saw mounted to a wheeled stand; FIG. 2 depicts a side view of the right side of the table saw of FIG. 1 with the cover, swash plate, and workpiece removed with a height adjustment stand at the upper position Plan view; FIG. 3 depicts a side plan view of the left side of the table saw of FIG. 1 with the cover, workpiece support surface, and inclined plate removed; FIG. 4 depicts the height adjustment stand, steering arm assembly, and motor assembly of the table saw of FIG. 1 Fig. 5 depicts a top perspective view of the height adjustment stand of Fig. 4 together with rods and tubes for guiding the movement of the height adjustment stand; Fig. 6 depicts a side cross-sectional view of the motor assembly of Fig. 4; 7 depicts a plan view of the motor assembly of FIG. 4 from the left side of the table saw; FIG. 8 depicts the motor assembly of FIG. 4 from the left side of the table saw after the motor assembly has been rotated to provide the desired tension to the belt of FIG. 4 FIG. 9 depicts a side plan view of the orbital portion of the height adjustment stand of FIG. 4; FIG. 10 depicts an exploded view of the orbital portion of FIG. 9; FIG. 11 depicts a partial exploded view of an illustrative specific example of the orbital portion; Another illustrative specific example of a rail bracket A top perspective view; FIG. 12A depicts a top plan view of the rail bracket of FIG. 12; 13 depicts a cross-sectional view of the track assembly of FIG. 10 supporting the steering arm assembly; FIG. 14 depicts a bottom perspective cross-sectional view of the track assembly of FIG. 13; FIG. 15A depicts an exploded view of the steering arm assembly of FIG. 4; FIG. 15B depicts a side perspective view of the steering arm assembly of FIG. 4; FIG. 15C depicts a side plan view of the steering arm assembly of FIG. 4; and FIG. 16 depicts the right side of the table saw of FIG. 1 with the cover and workpiece support surface removed 17 is a perspective view of a height adjustment stand having a pyrotechnic assembly and a latch assembly mounted to the height adjustment stand of FIG. 4; FIG. 18 is a perspective view of the sleeve of FIG. 17; FIG. 20 depicts a perspective view of the pyrotechnic enclosure of FIG. 17; FIG. 21 depicts a top plan view of a portion of the table saw of FIG. 1 with a throat plate removed; and FIG. 22 depicts a common location showing the location shared by the center of gravity and the ribs of the steering arm frame Figure 4 shows a side cross-sectional view of the steering arm frame; Figure 23 depicts a side perspective view of a pyrotechnic cover mounted to a height adjustment stand; Figure 24 depicts an exploded view of the pyrotechnic assembly of Figure 17; Figure 25 depicts an electrical connector The top plan view of the pellets in Figure 17; Figure 26 FIG. 29 depicts the pellets of FIG. 17 moving the latch assembly of FIG. 17 when the reaction plug of FIG. 24 is screwed into the pyrotechnic enclosure; FIG. 30 to FIG. 31 depict the behavior when the reaction plug is removed. The latch assembly of FIG. 17 in which the pellets are biased outward from the pyrotechnic cover during operation; FIG. 32 depicts a side plan view of the steering arm assembly of FIG. 4 indicating the axis of each component; FIG. 33 depicts a side plan view of the table saw of FIG. 1 when the steering arm assembly has fallen against the surface when the height adjustment arm is in the upper position; FIG. 34 depicts where the steering arm assembly is latched and the height adjustment frame is in FIG. 35 depicts a side plan view of the table saw of FIG. 1 in a lower position; FIG. 35 depicts a side plan view of the table saw of FIG. 1 in which the height adjustment frame is in a lower position against the surface to cause the steering arm assembly to fall; Top perspective views of a rebound latch assembly mounted to a height adjustment stand; Figures 37 to 39 depict left, top and right plan views of a height adjustment stand showing ribs to provide increased strength; Figures 40 to 41 depict A perspective view of a bevel frame showing ribs to provide increased strength; FIG. 42 depicts a saw control unit assembly mounted to the bevel frame; FIG. 43 depicts an exploded view of the saw control unit assembly and bevel frame of FIG. 42; and FIG. 44 depicts Fig. 42 is an exploded view of the saw control unit assembly, steering arm assembly and bevel frame; Fig. 45 depicts a side perspective view of the bevel frame showing coaxial wiring for providing communication with various components; Fig. 46 depicts the Various groups Shield and center conductor of coaxial wiring for electrical communication; Figure 47 depicts a perspective view of the connection between the center conductor and the CCP; Figure 48 depicts a perspective view of the coaxial wiring shifted from its normal position, where the connection The protective cover has been removed to show the beveled frame attached to the exposed shield of the beveled frame; Figures 49 to 50 depict the stripped portion to cover the stripped coaxial cable and also provide communication between the coaxial cable and other components protection cap; FIG. 51 depicts a side perspective view of the table saw of FIG. 1 with the outer cover removed to show the way the component communicates with the shield of the coaxial wiring; FIG. 52 depicts a pivot to show the electrical isolation between the workpiece support surface and the bevel frame An exploded view of the trunnion of the sloping frame; Figure 53 is a cross-sectional view showing the mandrel and the rest of the steering arm assembly and the mandrel that electrically isolates the belt; Figure 54 is a diagram that provides the electrical isolation between the belt and the mandrel Figure 53 is an exploded view of the pulley; Figure 54A is a side plan view of the housing of Figure 54 showing a dovetail spline; Figure 55 depicts a motor showing a radial guide vent that directs carbon dust away from one or more of the components A perspective view of the assembly; FIG. 56 depicts a partial exploded view of the throat plate and the workpiece support surface of FIG. 1; FIG. 57 depicts a perspective view of the throat plate engaged by the knob with the workpiece support surface removed; Top perspective view of the knob; Figure 59 depicts a side plan view of the front of the throat plate; Figure 60 depicts a partial perspective view of the steering arm assembly, where the spindle lock of Figure 15B engages the pyrotechnic cover to maintain the steering arm assembly in the warp Under latching conditions; Figure 61 depicts Partial top perspective view of the table saw of FIG. 1 with the throat plate removed to allow resetting of the steering arm assembly; FIG. 62 depicts a side perspective view of the HMI unit of FIG. 1; FIG. 63 depicts the internal components of the HMI unit of FIG. 62 Fig. 64 depicts a plan view of the table saw of Fig. 1 with the inclined plane at zero degrees; Fig. 65 depicts a plan view of the table saw of Fig. 1 with the inclined plane at a forty-five degree inclined plane such that Via the dust port access slot of the table saw cover, the USB port of the saw control unit assembly is visible; and Figures 66 to 67 depict protective covers that can be used to protect the USB port of Figure 65 from improper access.

Throughout the views, corresponding reference numerals indicate corresponding parts. Throughout the views, similar reference numerals indicate similar parts.

Although the power tool described herein is susceptible to various modifications and alternative forms, specific specific examples thereof have been shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that there is no intention to limit power tools to the particular form of disclosure. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the scope of the accompanying patent application.

Referring to FIG. 1, a table saw assembly 100 is shown. The table saw assembly 100 includes a table saw 102 mounted to one of the wheeled bases 104. The table saw 102 includes a base cover 106 and a workpiece support surface 108. Support surface extensions 110 and 112 are provided to assist in supporting larger workpieces. A fence 114 is provided to guide the workpiece along the workpiece support surface 108.

A cleaver or separator 116 is positioned adjacent the saw blade 118, which extends from within the base housing 106 above the workpiece support surface 108. The blade guard 120 and the recoil pawl 117 may be attached to the separator 116. The saw blade 118 extends through a slot in the throat plate 122. A human machine interface (HMI) unit 124 is provided at a front portion of the table saw 102.

An angle indicator 130 located adjacent to the HMI unit 124 indicates the angle of the saw blade 118 with respect to the workpiece support surface 108. The bevel adjustment lock 132 can be used to establish the angle of the saw blade 118 with respect to the workpiece support surface 108 by pivoting the bevel frame 134 (shown in FIG. 2) within the base housing 106. Then clamp the bevel frame 134 to the bevel adjustment lock 132 and the bevel clamp 133 (see Figure 3). As further depicted in FIG. 3, a height adjustment wheel 136 is used to adjust the height of the saw blade 118 above the workpiece support surface 108 (not shown in FIG. 3). The rotation of the height adjustment wheel 136 rotates the helical gear 138 that meshes with the threaded rod 140. Therefore, depending on the direction of the rotation height adjusting wheel 136, the threaded rod 140 is forced to rotate clockwise or counterclockwise.

The threaded rod 140 engages the height adjustment frame 142 in a threaded manner. In a specific example, the threaded rod 140 engages the threaded bushing 152 of the height adjustment bracket 142. Therefore, when the threaded rod 140 is rotated, the height adjustment bracket 142 is forced to move upward and downward. The rotation of the height adjustment frame 142 is prevented by the height adjustment rod 144 and the height adjustment tube 146 fixedly attached to the bevel frame 134. The height adjustment rod 144 and the height adjustment tube 146 extend through the openings 148 and 150 in the height adjustment frame 142, respectively (which are shown in FIG. 4).

In order to reduce the weight of the table saw 102, a lightweight material (for example, aluminum) is used in the manufacture of the height adjustment frame 142. Although effective for reducing weight, aluminum is typically not strong enough to withstand various forces (described more fully below) applied to the height adjustment stand 142 without deformation or damage. Therefore, the powder metallurgy bushing 153 shown more clearly in FIG. 5 is provided in the opening 150. The bushing 153 distributes the force equally along the opening 150, thereby reducing the possibility of damage to the mouth of the opening 150, in particular, which may cause an improper looseness between the height adjustment bracket 142 and the height adjustment tube 146. open".

Similarly, a powder metallurgy slotted bushing 154 is provided over the mouth of the opening 148 to protect the opening 148 from damage from the height adjustment rod 144. In other specific examples, one or more of the bushings 153/154 are replaced by a linear bearing or a split guide gasket. In some specific examples, the bevel frame 134 is protected by the combination of a damping bush at a position supporting the height adjustment rod 144 and / or the height adjustment tube 146.

Returning to FIG. 4, the motor assembly 160 is supported by the height adjustment bracket 142. The motor assembly 160 drives the belt 162 via an offset drive shaft 164 and a pulley 166 shown more clearly in FIG. 6. In one embodiment, the belt is made from a conductive material. The offset transmission shaft 164 is offset by the gear 170 automatic power shaft 168. The motor assembly 160 is attached to the height adjustment frame 142 in a manner that allows the belt 162 to be tensioned without the need for a linear tensioner (as explained with reference to FIG. 7).

As shown in FIG. 7, the motor assembly 160 is attached to the height adjustment bracket 142 by four screws 172 inserted through respective mounting grooves 174 in the motor gear housing 176. The mounting groove 174 is oriented to define a motor mounting rotation shaft 178 under the rotation shaft 180 of the power shaft 168, and the rotation shaft of the power shaft is below the offset shaft 164. Thus, rotation of the lifting screw 182 in one direction with the plate 184 fixedly attached to the height adjustment bracket 142 causes the lifting screw 182 to push the plate 186 attached to the motor gear housing 176. In a specific example, the plate 184 is formed as a part of the height adjustment frame 142 or integrated into the height adjustment frame 142 as a single unit. Therefore, instead, the lifting screw 182 meshes with the height adjustment frame 142 in a threaded manner. Since the plate 186 impacted by the lifting screw 182 is located above the motor mounting rotation shaft 178, the motor assembly 160 is rotated from the position in FIG. 7 to the position in FIG. 8 in the direction of arrow 188.

Returning to FIG. 4, the above-mentioned movement of the motor assembly 160 moves the pulley 166 attached to the offset drive shaft 164 away from the pulley 192 rotatably supported by the steering arm assembly 194 in the direction of arrow 190. Therefore, the belt 162 is placed under tension. Therefore, the motor assembly 160 may be placed in the position of FIG. 7 for initial assembly, and then pivoted toward the position depicted in FIG. 8 to a position providing the desired tension of the belt 162. This configuration requires less linear stroke than a linear adjustment mechanism to achieve the same tension in a confined space. In other specific examples, a spring-loaded actuator replaces the lifting screw 182 to maintain tension of the belt over time.

The tension of the belt 162 is verified using a belt tension meter inserted through a belt tension access port 196 (see FIG. 4) in the upper surface of the belt protection cover 198. The positioning of the access port 196 on the upper surface of the belt protection cover 198 allows the belt 162 to be accessed from above the table saw 102. This allows the belt tension to be set more easily, while maintaining the structural requirements for the height adjustment stand, without turning the saw upside down to access the belt 162. Although depicted as a circular opening, the access port 196 in other specific examples has a different geometric shape, and in some specific examples, has a removable plug or an access door.

Continuing with FIG. 4, the steering arm assembly 194 is movably connected to the height adjustment frame 142 by a rail shaft 200 that defines a steering arm rail axis 201. Use the track bracket 203 described further with reference to FIGS. 9 to 10 to control the position of the steering arm track axis 201 at the rotation axis 202 (which is also the rotation axis of the pulley 166) located at the offset drive shaft 164 (see FIG. 6) and Between the rotating shafts 183 of the pulley 192.

The track bracket 203 includes a track shaft hole 204 through which the track shaft 200 is inserted. The track bracket 203 further includes an alignment hole 205 and an anti-rotation groove 206 that respectively receive the positioning pin 207 and the anti-rotation pin 208 extending from the height adjustment bracket 142. The rail bracket 203 is connected to the height adjustment bracket 142 by two screws 210.

The axis 211 of the anti-rotation groove 206 is aligned to intersect the center axis 212 of the alignment hole 205. Therefore, when the locator pin 207 and the anti-rotation pin 208 are respectively positioned in the alignment hole 205 and the anti-rotation groove 206, the anti-rotation pin 208 and the anti-rotation groove 206 provide accurate angular positions for alignment. Steering arm track axis 201.

The combination of the track bracket 203 with the anti-rotation groove 206 and the anti-rotation pin 208 realizes the use of lightweight materials, while providing increased accuracy when positioning the saw blade 118. In some In the body example, two shoulder screws 213 (see FIG. 11) or alignment pins 214 (FIG. 12) received in corresponding holes (not shown) on the height adjustment bracket 142 are used to achieve accurate positioning of the track bracket. The alignment of the saw blade 118 is further provided by merging the inner surface 228 of the rail bracket 203 with an angle 230 about 0.65 ° about a plane parallel to the falling plane (see below and FIG. 21). This angled inner surface provides increased accuracy when positioning the saw blade 118 through various beveled angles, even when the belt 162 is under increased tension.

The added accuracy in positioning the saw blade 118 is further provided by the manner in which the steering arm assembly 194 is movably connected to the height adjustment bracket 142. Specifically, as shown in FIG. 13, the track shaft 200 is movably supported in the steering arm frame 242 of the steering arm assembly 194 by two bearings 215. The track bolt 232 engages the track shaft 200 in a threaded manner and the inner bearing wall 234 of the bracket 236 spaced from the steering arm frame 242 abuts against the compression bearing 215.

The rail pins 216 extend through the aligned holes 217, 218, and 219. The hole 218 extends through the track shaft 200. The hole 217 extends through the upper portion of the track bracket 203, and the hole 219 extends through the lower portion of the track bracket 203. The rail shaft 200 is thus orbitally fixed with respect to the rail bracket 203. Two fixing screws 220 extend through holes 221 in the lower portion of the track bracket 203 and anchor the track shaft 200 against the two shoulders 222 of the track shaft hole 204 depicted in FIG. 14.

The shoulder portion 222 is formed in the track shaft hole 204 by forming the lower round portion 224 of the track shaft hole 204 and the upper round portion 226 of the track shaft hole 204. The diameter of the lower circular portion 224 is substantially the same as the diameter of the track shaft 200. The upper circular portion 226 has the same or different diameter as the lower circular portion 224 in different embodiments. However, the starting point of the upper circular portion 226 is offset from the starting point of the lower circular portion 224 in a direction opposite to the position of the fixed screw 220.

Therefore, the upper circular portion 226 provides sufficient clearance for the sliding fit between the track shaft 200 and the track shaft hole 204. At the same time, the interface between the upper circular portion 226 and the lower circular portion 224 forms a shoulder portion 222 extending along the entire length of the track shaft hole 204. Therefore, when the fixed screw 220 is installed, the fixed screw 220 exerts a force on the rail shaft 200 to abut against the shoulder 222, thereby forming a "three-point" lock between each of the fixed screws and the shoulder.

In some specific examples, the shoulder is replaced by two ball bearings that are pressed into the steering arm frame 242 using a bearing outer race. The orbital shaft 200 is then inserted with one side of the orbital shaft engaging the inner race of one of the bearings. Then, inside the track shaft, the track bolt is screwed from the opposite direction of the track shaft to engage the inner race of other bearings. The track shaft and bolt assembly move the inner races of the two bearings towards each other. In the case where the outer race is fixed in the steering arm and the inner race is pulled together, the internal clearance is minimized, thereby reducing or eliminating side-to-side movement due to the internal clearance of the bearing.

15A to 15C, the steering arm assembly 194 is further described in detail. As noted above, the slave pulley 192 meshes with the belt 162 and is rotatably supported by the steering arm assembly 194. More specifically, the slave pulley 192 is rotatably supported by a mandrel 240 configured to rotatably support the saw blade 118 (see FIG. 1). The mandrel 240 is rotatably supported in the steering arm frame 242.

The steering arm frame 242 further includes a spring well 244 that accommodates one of the springs 246 (FIG. 15B). The spring 246 is operatively connected to the flange 248 of the spindle lock 250. The mandrel locking member 250 includes a starting arm 252 and a locking ramp 254 positioned above the steering arm frame 242. The mandrel 240 extends through the mandrel groove 256, and the two shoulder screws 258 extend through the guide groove 260 and engage the steering arm frame 242 in a threaded manner.

The steering arm assembly 194 includes one of the connector tabs 264 extending from it. 接 板 (CCP) 262. The CCP is mounted to the CCP bracket 268 using a screw, and five screws, which are the same or different types of screws 266, are illustrated, and the CCP bracket is mounted to the steering arm frame 242 using three fixed screws 269. The CCP bracket 268 includes one of the raised lips 270 configured to provide electrical isolation between the CCP and the saw blade. Although a single piece of CCP bracket 268 is depicted in the specific example of Figure 15a, multiple modules that are not connected to each other in some specific examples are used to form brackets in other specific examples.

CCP 262 is part of a capacitive sensing system (discussed further below) and is manufactured from a conductive material. As depicted more clearly in Figure 15C, CCP 262 is not symmetrically shaped. Conversely, the center of mass of the CCP 262 is shifted toward the track 272 of the steering arm frame 242. This shape provides sufficient capacitance while reducing the inertia of the steering arm assembly 194. In a specific example, the modified surface layer treatment for CCP 262 is a non-conductive coating. Acceptable coatings include manganese phosphate for steel CCP, and anodizing for aluminum CCP. This thin non-conductive covering provides isolation in the event of accidental contact between the saw blade and the conductive portion of the CCP during heavy cutting due to the saw blade deflection.

The CCP bracket 268 is manufactured from a non-conductive material. In a specific example, a plastic having a low dielectric constant that is not affected by water is used in order to minimize the change in capacitance of the system. The CCP bracket 268 is inserted into the steering arm and manually adjusted to a proper distance from the saw blade, and then is locked in place by a fixed screw 269 (see FIG. 15A, only two of which are shown).

Specifically, the screw 266 is used to mount the CCP 262 to the CCP bracket 268 by engaging the ridge 271 in a threaded manner. Optionally, in addition to the screw 266, a fastening element such as a nut (not shown) may be used to mount the CCP 262 to the CCP bracket 268. In another specific example, the CCP bracket 268 is overmolded to the CCP 262 as a single unit. So no longer needed Fastening element. The ridge 271 is then inserted into the well 273 formed in the steering arm frame, and adjusted to set the CCP 262 to the desired position. Next, a fixed screw 269 is inserted through a hole in the well 273 to engage the ridge 271.

The ridge 271 electrically isolates the screw 266 and the CCP 262 from the steering arm frame 242. The raised lip 270 of the CCP bracket 268 surrounds the CCP 262 along the outer edge to protect the CCP 262 from accidental contact with the saw blade during heavy cutting.

Continuing with FIG. 15C, the rail 272 includes a rebound ledge 274/275 (see also FIG. 15A), and a pad 276 is mounted to the lower surface of the steering arm frame 242. As best viewed in FIG. 15B, the steering arm assembly 194 further includes two alignment pins 278, a hemispherical impact pin 280, and a latch pin 282 supported by the steering arm frame 242.

Referring now to FIG. 16, the steering arm assembly 194 is maintained in the latched position by the latch 300. The latch 300 is movably connected to the pyrotechnic cover 322 by a pin 302. The latch 300 (also shown in FIG. 17) includes a latch pin receiving area 304 that engages the latch pin 282 in the latched position. The latch 300 further includes two prongs 306. The latch 300 is biased by a spring 308 such that the prong 306 is biased into contact with the pellet 310.

The pellet 310 is paired with a sleeve 314 shown in FIG. 18 and another pellet 312. The bridge 320 engages two pellets 310/312 in the sleeve 314.

A sleeve 314 mounted in a pyrotechnic enclosure 322 (also referred to as an actuator enclosure) is shown in FIG. 17. The pyrotechnic or actuator housing 322 (also shown in FIGS. 19-20) includes an internally threaded chamber 324, a mounting plate 326, and a finger plate 328. The locking ramp 364 is located at an upper portion of the finger plate 328. The slit 330 extends along one side of the internally threaded cavity 324 and terminates at a rounded end portion 332. This configuration allows optimal positioning of the pellets in action, as further illustrated in the figure 21 and FIG. 22 are explained.

FIG. 21 depicts a partial top plan view of a table saw 102 with a throat plate 122 removed through a throat plate opening 334. Visible through the throat opening 334 is a mandrel nut 336 and a saw blade 118 mounted to the mandrel 240. A portion of the steering arm assembly 194 and the height adjustment frame 142 is also visible through the throat opening 334. Also depicted in FIG. 21 is a drop plane 338. The drop plane 338 is a plane aligned with it, wherein the pellets 310 are connected with the steering arm assembly interface, and when the saw control system is activated, the steering arm assembly moves along the plane in a substantially parallel manner, as described below. Explain fully. FIG. 22 depicts a cross-sectional view of the steering arm assembly 194 taken parallel to the drop plane 338 of FIG. 21.

Figures 21 and 22 therefore show that the steering arm assembly 194 is configured so that the center of gravity 340 of the steering arm assembly 194 lies on a falling plane 338, closest to or adjacent to the falling plane, so that the force from the pellet to the hemisphere impact The transfer of the pins 280 takes place as close as possible to the drop plane 338.

Therefore, the pyrotechnic enclosure 322 is configured such that the active pellets are substantially centered in the drop plane 338. This results in reduced stress for the system and reduced fall time for the steering arm assembly 194. In addition, the non-acting pellets (the pellets 312 in the configuration of FIG. 21) are positioned within the active pellets, while the sleeve 314 is maintained in a position that is easily accessible through the throat opening 334. This configuration ensures that the non-active pellets do not interfere with the movement of the steering arm assembly 194.

In order to further improve the alignment of the pellets with the hemispherical impact pins 280 during the action, the alignment cover 342 is mounted to the pyrotechnic cover 322, as shown in FIG. 17. The alignment cover 342 houses hardened steel alignment pins 278 (FIG. 15B), thereby reducing deflection of the saw blade under load and ensuring proper alignment between the pellets and the hemispherical impact pins 280 during operation. 194 in the steering arm assembly The center-providing pin 278 further provides enhanced stability of the steering arm frame 242 against side loads or torsional loads that abut the rail shaft 200 (FIG. 4). Using hardened steel pins as alignment pins extending from aluminum, the steering arm frame 242 achieves this benefit while allowing lightweight / low-inertia steering arm frame 242.

Although two pins 278 are shown in FIG. 15B, in other specific examples, only one is used. However, in another specific example, one or more protrusions or surfaces are used in the system. In addition, in some specific examples, the alignment cover is positioned in the steering arm assembly 194, and hardened steel pins extend from the pyrotechnic cover 322. In another specific example, the alignment features are integrated into the latch 300 and / or the pellet.

The slit 330 in the outer cover 322 receives the bridge 320 of the sleeve 314. The slit 330 thus allows the incorporation of spare pellets into the sleeve 314. However, the slit 330 weakens the pyrotechnic cover 322. Therefore, support is required at both the forward position and the rearward position with respect to the slit 330 to prevent the failure of the pyrotechnic cover 322. When the rear mounting plate 326 is tightly bolted to the height adjustment bracket 142 with two bolts 346 and a pin 348 (shown in FIG. 23), the forward portion of the pyrotechnic cover 322 will cause unacceptably high stress Even in the case where a rounded end portion 332 suppressing cracking at the end of the slit 330 is provided. It is for this reason that a finger board 328 is used.

As depicted in FIG. 17, the forward portion of the pyrotechnic cover 322 is supported by contact between the finger plate 328 and the finger rib 344 on the height adjustment bracket 142. The finger plate 328 thus transfers the force in the direction of the high temperature point (under the pyrotechnic cover 322), but does not limit the pyrotechnic cover 322 in any other degree of freedom, which greatly reduces the stress level in this section and allows self-affordability The pyrotechnic cover 322 is made of a lightweight material. In this specific example, three fingers are provided. In other specific examples, more or less fingers are provided.

The revealed pyrotechnic system offers many additional features. By way of example, the smoke of Figure 24 The fire assembly 350 includes two pellets 310/312. Although the saw control system in some examples provides electrical inspection to ensure that unused pellets are connected, the safety control system in some examples is not configured to ensure that the connected pellets are properly installed in the fireworks In the housing 322 and thus aligned with the hemispherical impact pin 280. However, the pyrotechnic assembly 350 shown in FIG. 24 is configured to ensure that the user does not mistakenly connect the wrong pellets.

FIG. 24 depicts a pyrotechnic assembly 350 including a pyrotechnic cover 322, a sleeve 314, and pellets 310/312, which have been described above. The pyrotechnic assembly 350 further includes an electrical connector 352, a connection wire 354, and a reaction plug 356.

Typically, the pellets 310/312 and the sleeve 314 are provided as a single unit. In addition, the table saw 102 is provided with a connection wire 354 inserted through the opening 358 of the reaction plug 356 as shown most clearly in FIG. 25. One end of the connection wire 354 is permanently attached to the saw control unit, and the other end is attached to the electrical connector 352.

The pyrotechnic assembly 350 is assembled by providing pellets 310/312 in the sleeve 314. The pellets 310/312 and the sleeve 314 are inserted into the pyrotechnic cover 322. For the new unit, align any of the pellets 310/312 with the housing axis 366 and insert into the internally threaded chamber 324. If the unit has been previously used, the unused pellets are inserted into the internally threaded chamber 324.

Next, the electrical connector 352 is inserted into the plug of the pellet 310/312. The reaction plug 356 is then threaded into the internally threaded chamber 324. Because the electrical connector 352 is larger than the opening 358 (see FIG. 25), if the electrical connector 352 is connected to the pellets located in the internally threaded chamber 324, only the reaction plug 356 can be screwed into the internally threaded chamber Room 324. The combination of the electrical connector 352 and the mating connector on the pellets thus enables the combination of the mechanical / electrical locks as described above.

In other specific examples, the reaction plug 356 and the electrical connector 352 may be replaced by a snap-on lid or a flashlight-like lid. In addition, the electrical connector 352 may be omitted in these specific examples and replaced by a simple pigtail connector.

The reaction plug 356 further assists the locking function of ensuring that the sleeve 314 is fully seated within the pyrotechnic housing 322. As shown in Figure 26, the spring 308 biases the latch 300 in a clockwise direction. When the reaction plug 356 is not sufficiently threaded into the internally threaded chamber 324 (as depicted in FIG. 26), the prongs 306 force the pellets 312 upwards within the internally threaded chamber 324 and the latch 300 Rotate clockwise to a position where the lower surface of the lower portion 360 of the latch 300 is located in the falling path of the latch pin 282. Therefore, the counterclockwise orbital movement of the steering arm assembly 194 is restricted by the contact between any part of the steering arm assembly and the lower part 360. Therefore, the latch pin 282 cannot be stored in the latch pin storage area 304.

By rotating the reaction plug 356 in one direction to further engage the internally threaded chamber 324, a force is applied to the reaction plug 356 to abut against the sleeve 314 or the pellet 310, thereby applying force to the pellet 310 or the sleeve 314 to Opposite the fork tip 306. This forces the spring 308 to compress and rotate the latch in a counterclockwise direction, resulting in the configuration of FIG. 27. In FIG. 27, the counterclockwise orbital movement of the steering arm assembly 194 is still constrained by the contact between the latch pin 282 and the lower surface of the lower portion 360.

The continued rotation of the reaction plug 356 allows the sleeve 314 to be fully seated in the internally threaded chamber 324, thereby further rotating the latch 300 to the configuration of FIG. 28. In FIG. 28, the latch 300 has been rotated so that the side surface of the lower portion 360 is within the falling path of the latch pin 282. Therefore, by causing the steering arm assembly 194 to orbit in the counterclockwise direction, the latch pin 282 presses the side surface of the lower portion 360, so that when the latch pin 282 follows the lower portion 360 When the side surface slides upward, the spring 308 is further compressed and the latch 300 is rotated in the counterclockwise direction.

The steering arm assembly 194 continues to run counterclockwise orbit and moves the latch pin 282 above the side surface of the lower portion 360. Therefore, the spring 308 causes the latch 300 to rotate in a clockwise direction, resulting in the configuration of FIG. 29. In FIG. 29, the latch 300 has been rotated in a clockwise direction, so that the latch pin 282 is received in the latch pin storage area 304.

Therefore, if the reaction plug 356 is not sufficiently threaded into the pyrotechnic housing 322, the latch 300 provides a mechanical "lockout" and the steering arm assembly 194 cannot be raised to the cut / latched position. Although described with respect to pyrotechnic devices, the reaction plug 356 can be used with any desired type of actuator to provide both mechanical and electrical latching capabilities.

The reaction plug 356 is typically configured so that it can be easily turned by hand. In one specific example, the reaction plug 356 includes a rib 362 configured to allow tightening / releasing (see Figure 24). The rib 362 is further configured to allow the reaction plug 356 to be tightened / loosened by an adjustable wrench (not shown). In some specific examples, the reaction plug is a hexagonal plug that can be replaced by a standard hexagonal wrench. In another specific example, a locking feature is provided separate from the reaction plug that requires tools to allow rotation of the reaction plug. By way of example, the locking feature may be a spring-loaded component (ball bearing, spring tab) that is operated by advancing a locking tab that requires a screwdriver or similar tool to release. In other specific examples, holes and extruded pins are used with the circular reaction plug, which requires a special wrench to tighten and loosen the reaction plug.

Biasing the latch 300 into the active pellet by the spring 308 also assists in the removal of the sleeve 314, as explained initially with reference to FIG. 30. FIG. 30 depicts a sleeve 314 fully seated within the pyrotechnic enclosure 322. To remove the sleeve 314, the reaction plug 356 is removed. Because with the active pills The offset latch 300 is offset, so the removal of the reaction plug 356 allows the sleeve 314 to be pushed up to the position depicted in FIG. 31. The user may then grip the upper portion of the sleeve 314 above the inactive pellet instead of pulling the sleeve 314 using the connection wire 354.

Referring back to FIG. 16, when the shot 310 is activated by the saw control system, the shot 310 applies a force to the steering arm assembly 194 via the hemispherical impact pin 280. This force is transferred to the latch pin 282 (see FIG. 29). The latch pin applies a force to the latch 300 to compress the spring 308 and move the latch pin receiving portion 304 of the latch 300 out. Drop path of latch pin 282. The steering arm assembly 194 then orbits in a clockwise direction, thereby moving the saw blade 118 (see FIG. 2) mounted to the spindle 240 under the workpiece support surface 108.

As discussed above, the position of the steering arm rail axis 201 is controlled to be located between the rotation shaft 202 of the offset drive shaft 164 and the rotation shaft of the slave pulley 192. This arrangement provides an increased falling speed of the steering arm assembly 194 and prevents damage or stretching of the belt that would degrade powertrain efficiency, as explained further with reference to FIGS. 6, 15A, and 32. FIG. 32 shows the steering arm track axis 201, the rotation axis 202 of the offset drive shaft 164, and the rotation axis 183 of the slave pulley 192. Since the pulley 166 is mounted to the height adjustment bracket 142 and is mounted on the steering arm assembly 194 from the pulley 192, the tension of the belt 162 as described above moves the pulley 166 away from the steering arm track axis 201 (leftward in FIG. 32 ). As a result, during the fall of the steering arm, it moves from the pulley 192 toward the pulley 166. Therefore, the axis 183 moves closer to the axis 202. This reduction in distance causes the belt to loosen, which results in faster fall times.

The impact portion of the steering arm assembly 194 is absorbed by the contact between the pad 276 and the surface 374, as shown in FIG. 33. The pad 276 is mounted on the steering arm assembly 194 using any desired mounting method (such as glue, fasteners, splints, etc.). Position the pad 276 on the steering arm Forms 194 allow pads having a smaller geometric size than when pads are mounted on surface 374.

For example, FIG. 33 depicts the position of the impact between the steering arm assembly 194 and the surface 374 when the height adjustment frame 142 is initially in a fully raised position as depicted in FIG. 2. When the height adjustment bracket 142 is in the lowest position as depicted in FIG. 34, the steering arm assembly 194 contacts the surface 374 at a lower position, as depicted in FIG. 35. Therefore, covering the surface 374 contacted by the steering arm assembly 194 will cost more material than the portion covering the contact surface 374 of the steering arm assembly 194. Therefore, installing a pad 276 on the steering arm assembly 194 reduces the amount of pad material required.

The configuration of the steering arm frame 242 is therefore partially selected to provide the desired surface for the contact surface 374. Returning to FIG. 22, the configuration of the steering arm frame 242 is further selected to reduce the weight of the steering arm frame 242. As depicted in FIG. 22, a number of ribs 376/378/380/382 extend from the lower surface 384 to an opening 386 that receives the mandrel 240. The ribs 376/378/380/382 provide strength that allows the use of less material and / or allows the use of lighter materials. In the case of a steering arm assembly 194, this translates into a reduced moment of inertia, thereby providing a more rapid reduction of the steering arm assembly in response to a sensed unsafe condition.

Once the pad 276 contacts the surface 374, the ribs 376/378/380/382 also reduce the rebound force of the steering arm assembly 194. As shown in Figure 22, the ribs 376/378/380/382 each define a respective axis 388/390/392/394. The axis 388/390/392/394 intersects at location 396, which coincides with the center of gravity 340, is closest to, and is closest to, the center of gravity. This configuration reduces the rebound energy and allows a reduction in the amount or weight of the material.

The above configuration is typically insufficient for the dissipation of all rebound energy of the steering arm assembly 194. Therefore, a bounce latch assembly 400 is provided, as shown in FIG. 36. Springback lock The register assembly 400 includes a lower latch 402 and an upper latch 404 that are independently and movably connected to the track bracket 203 by pins 406. In some embodiments, pin 406 is sized longer than necessary to provide tolerance. A wave washer (not shown) may be used between the head of pin 406 and latch 404 to allow for tolerances while providing the desired tension to the system.

The lower latch 402 and the upper latch 404 are biased by two springs 410 and 412 to contact the rebound surface 408 of the steering arm frame 242, respectively. The springs 410/412 are anchored to the rail bracket 203 by bolts 414. The rebound latch assembly 400 further includes a reset lever 416 that extends from the lower latch 402 to a position above the track bracket 203.

During orbital operation of the steering arm assembly 194 in response to the sensed unsafe condition, the rebound surface 408 orbited in a clockwise direction (as viewed in FIG. 36). When the rebound surface 408 orbits, the rebound ledge 275 (see FIG. 15A) orbits past the lower latch 402. Therefore, the spring 410 biases the lower latch 402 into contact with the rebound surface 408 at a position inward of the rebound ledge 275 at the outermost access. Subsequently, the steering arm assembly 194 contacts the surface 374, as described above. When the steering arm assembly 194 rebounds away from the surface 374, the lower latch 402 becomes in contact with the rebound ledge 275, thereby preventing the steering arm assembly 194 from moving further upward (counterclockwise).

The rebound ledge 274 (see FIG. 15A) and the upper latch 404 operate similarly. The main difference is that in order for the bounce ledge 274 to orbit under the upper latch 404, more clockwise orbit of the bounce surface 408 is required. This occurs, for example, when positioning the height adjustment bracket 142 toward its highest position, such as the height depicted in FIG. 16. Therefore, at higher positions, rebound protection is provided by the rebound wall shelf 274 and the upper latch 404, and at lower heights (such as the height depicted in FIG. 34), rebound protection is latched by the rebound wall shelf 275 and lower器 402。 Provided.

When the user wishes to return the steering arm assembly 194 to the latched position, the user pushes a reset lever 416 that moves the lower latch 402 away from the rebound surface 408. In addition, the lip 418 of the lower latch 402 contacts the upper latch 404, thereby moving the upper latch 404 away from the rebound surface 408. The steering arm assembly 194 may then be raised to a latched position held by the latch 300.

The aforementioned use of the ribs that reduce the weight of the steering arm assembly 194 also reduces the total weight of the table saw 102, thereby making the table saw 102 more portable. For the same purpose, ribs are used in other areas of the table saw. For example, FIGS. 37 to 39 depict various views of the height adjustment bracket 142. A large number of ribs 420 are provided to accommodate large impact forces from the pellets 310/312.

Similarly, the bevel frame 134 includes ribs 422/424/426/428, along with other structural features as depicted in FIGS. 40-41. Also shown in FIGS. 40 to 41 are openings 430 and 432. The ribs 424 and 428 provide structural support to the surface 374 impacted by the steering arm assembly 194 as discussed above. The ribs 422 and 426 and other structural features provide support that allows the openings 430 and 432 to be received. An opening 430 is required to allow installation of the motor assembly 160 (FIG. 4), while an opening 432 is provided to enhance the operation of the saw control unit, as will be discussed in further detail below. In addition, the removal of the material forming the opening 432 reduces the weight of the saw.

Therefore, in one specific example, ribs are used throughout the table saw 102 to keep the table saw 102 light and portable without damaging the structure. However, selective areas and components of the table saw 102 are provided in the form of stronger materials to ensure that the table saw 102 functions optimally, even after multiple pyrotechnics are activated. For example, the falling impact force is transferred via the steering arm, the track bracket, and into the height adjustment lever. Therefore, the area of the track bracket 203 (FIG. 10) and the bevel / height adjustment frame around the height adjustment rod is typically formed of a stronger and / or heavier material. Similarly, in some specific examples The quasi-cover 342 (FIG. 17), the pyrotechnic cover, and the latch 300 are manufactured from stronger materials, such as by using powder metallurgy, zinc die-casting, or the like.

Because many structural components are made of lightweight materials, the forces from pyrotechnic use and from the containment of the steering arm assembly 194 are not hindered. When positioning sensitive components, the power of transfer must therefore be considered. One such sensitive component is housed in the saw control unit assembly 450 of FIG. 42 mounted to the ramp frame 134. The saw control unit assembly 450 includes electronic components for controlling the table saw assembly 100. These electronic components include memory with program instructions stored therein that, when executed by the processor of the saw control unit assembly 450, control the safety control system.

As shown in FIG. 43, the saw control unit assembly 450 includes a printed circuit board (PCB) 452 mounted to one of the external housings 454. The outer cover 454 is in turn mounted to the inner cover 456. The saw control unit assembly 450 is then mounted to the bevel frame 134. The inner cover 456 and the outer cover 454 electrically isolate the PCB 452 from the bevel frame 134. USB port 458 (see Figure 42) provides electronic access to PCB 452.

The foregoing configuration of the saw control unit assembly 450 provides damping of force from pyrotechnic use and from the steering arm assembly 194. However, some of the power may still be transferred to PCB 452. Therefore, if the PCB 452 is mounted perpendicular to any of these force vectors, a large shock / vibration load will be applied to the PCB 452, which may cause damage to the PCB 452. Therefore, as best viewed in FIG. 44, the PCB 452 is mounted at an angle of about 15 degrees with respect to the plane of the force applied to the pellet and the impact on the surface 374.

If the PCB 452 is mounted in close proximity and parallel to a conductive subject that is carrying a signal (such as a bevel mount, discussed in further detail below), the signal can be capacitively coupled to the PCB 452 and cause other signals that we do not like Noise. Therefore, the bevel frame 134 and the saw control unit The meta assembly 450 is configured so that there is no parallel metal surface to couple noise to the PCB 452. It is for this reason that the opening 432 is provided in the bevel frame 134.

Although it is convenient to mount the PCB 452 on the bevel mount 134 for the purpose of wire wiring as discussed further below, in some specific examples, the PCB 452 is mounted on a plastic substrate or below the workpiece support surface. In these specific examples, the transfer of force and signal coupling is reduced, but the wiring of the wires is typically not optimal. Mounting the PCB 452 to the underside of the workpiece support surface has the additional advantage of using the workpiece support surface as a heat sink for a heat generating component (such as a bidirectional triode) for the PCB 452. In another specific example, a component such as a heat-generating second PCB different from the PCB 452 is mounted to the underside of the workpiece support surface and uses the workpiece support surface as a heat sink.

As noted above, for the convenience of wire wiring, the positioning of the saw control unit assembly 450 is selected in a specific example. Wire wiring for a specific example is depicted in FIG. 45. In FIG. 45, the PCB 452 is connected to the CCP 262 by a coaxial cable 460. The coaxial cable 460 shown in FIG. 46 includes a center conductor 462 insulated by an insulator 466 and a shield 464. An outer plastic coating 468 protects and insulates the shield 464. As best shown in Figure 47, the center conductor 462 of the coaxial cable 460 is connected to the connector tab 264 of the CCP 262 to provide a reliable connection that can withstand the impact load of a pyrotechnic ignition event.

Returning to FIG. 45, the coaxial cable 460 is connected to the height adjustment bracket 142 at the position 470 and provides sufficient slack in the coaxial cable 460 between the position 470 and the connector tab 264 to allow the steering arm assembly 194 to move without Detach the coaxial cable 460 from the connector tab 264.

The coaxial cable 460 is further connected to the bevel frame 134 at positions 472 and 474, and to the height adjustment frame 142 at position 476. Coaxial cable between positions 474 and 476 Sufficient slack is provided in 460 to allow movement of the height adjustment frame 142 with respect to the bevel frame 134.

In various locations, the plastic coating 468 is peeled to expose the shield 464. By way of example, FIG. 48 depicts a stripped area 478 associated with location 474. The stripped area 478 is placed in direct contact with the bevel frame 134 at position 474. Typically, a protective cover 480 (see FIG. 49) is then attached to the stripped area 478 to protect the stripped area 478 and ensure good contact between the shroud 464 and the underlying metal component.

Depending on the position of the connection, a double screw protective cover such as the protective cover 480 or a single screw protective cover such as the protective cover 482 of FIG. 50 may be used. In some embodiments, one or more of the protective covers are formed from plastic, while in other embodiments, one or more of the protective covers are formed from metal to provide increased connectivity. Alternatively, the coaxial cable shield 464 may be soldered directly to other components or surfaces.

In some specific examples, the connection-only position with a protective cover 480/482 is removed. Therefore, in some specific examples, the cable is stripped at positions 472 and 476 in FIG. 45, but the cable is not stripped at position 474.

Therefore, the shield 464 can be connected to multiple points without termination, and the coaxial cable shield 464 is also connected to the metal component in such a way as to provide protection to the coaxial cable 460, in which the outer plastic coating 468 is peeled off. Off. This ensures an uninterrupted shroud connection to all metal parts in the down frame assembly. The coaxial cable 460 is thus used to connect the shield to the bevel frame 134, the height adjustment frame 142, the chopper 116, and associated components, and the like.

A shroud connection to the angle indicator 130 (FIG. 1) is also provided by position 472. As discussed above, the location 472 is in electrical communication with the ramp 134 and is also shown in FIG. 51. The bevel frame 134 is in electrical communication with the bevel clamp 133. Finally, when the bevel frame 134 is adjusted by the bevel adjustment lock 132 When locked, the bevel clamp 133 is pressed to electrically communicate with the angle indicator 130. Accordingly, the angle indicator 130 is placed in electrical communication with the shroud 464.

The angle indicator 130 is electrically isolated from the workpiece support surface 108 by a non-conductive front plate 486. This allows the workpiece support surface 108 to be maintained at "neutral" when the angle indicator 130 is at the "shield". In other specific examples, electrical isolation is provided by a plastic isolator as a table connection, by using an all-plastic front plate or a plastic front plate with small inserts for bevel clamping, or by using a lock with bevel locking Full metal front plate of non-conductive isolator for parts and workpiece support surfaces. If desired, the workpiece support surface 108 may be connected to ground to reduce interference from the static electricity to the sensing system. Static electricity from saw blades and components connected to the shield can be improved by connecting their components to ground via a high resistance cable.

Because the bevel frame 134 is suspended from the workpiece support surface 108, the support mechanism must also be insulated. As shown in FIG. 52, the bevel mount 134 includes a pair of beveled trunnions 488 (only one can be seen in FIG. 52) that is pivotally supported by a pair of trunnion blocks 490 attached to the workpiece support surface 108 . The trunnion block 490 is insulated from the chamfered trunnion 488 by a pair of plastic trunnion inserts 492.

In some specific examples, the angle indicator 130 is connected to the shroud, alternatively or in addition, via a bevel mount 134 or a height adjustment mount 142. By way of example, FIG. 45 shows the bevel frame 134 connected to the "shield" at positions 472 and 476. Electrical communication with positions 472 and 476 may be provided via a powder metallurgy bracket 496 (see FIG. 51) in electrical communication with height adjustment rod 484 and / or via a threaded rod bracket 498 in electrical communication with height adjustment rod 484. Therefore, while the PM bracket 496/498 provides additional strength that allows other parts of the table saw 102 to be made of lightweight metal, it can also provide good electrical communication between components.

As indicated above, the height adjustment bracket 142 is connected to the shroud 464. Steering arm frame 242 It is in electrical communication with the height adjustment bracket 142 via the rail bracket 203. Therefore, the mandrel 240 and the saw blade 118 are electrically isolated from the steering arm frame 242. As shown in FIG. 53, the mandrel 240 and the steering arm frame 242 are electrically isolated by a plastic bearing housing 500 that supports the bearing 501 of the saw blade side 502 of the mandrel 240. The pulley side 504 of the mandrel 240 is supported by a bearing unit 506. The steering arm frame 242 includes a plastic overmolded part 508 that supports the rear bearing 510. Therefore, the saw blade 118 and the spindle 240, the spindle nut 336, and the blade washer 512/514 are each electrically isolated from the steering arm frame 242. In an alternative embodiment, the bearing 510 is isolated by a component (not shown), which can be incorporated into the rear bearing 510 by press-fitting, adhesive, overmolding, or other techniques. As an example, the bearing may be manufactured from a non-conductive material such as a ceramic material.

The mandrel 240 is further electrically isolated from the conductive belt 162 (FIG. 15A) by a pulley 192. As depicted in FIGS. 53 and 54, the pulley 192 includes an inner core 520, an intermediate core 522, and an outer shell 524. A washer 526 is provided between the mandrel 240 and the washer lip 528 from within the pulley 192. In another specific example, more than one gasket can be used in the system. The lock nut 530 maintains the pulley 192 on the mandrel 240.

The shim 526 provides a correct alignment between the pulley 192 and the pulley 166. A motor end pulley 166 is attached to the motor assembly 160. The driven pulley 192 is attached to the steering arm assembly 194. Due to the increased tolerance, the two pulleys 192/166 can be offset. Therefore, in this specific example, one of the pulleys is fixed and the other is adjustable. Although a shim is used in the specific example of FIG. 53, in other specific examples, the shim is replaced by a sliding collar or a collar that can be adjusted by turning on an external thread. In addition, specific examples include adjustable collars, movable collars with lifting screws in pulleys, inclined planes on pulleys and shafts, c-rings instead of lock nuts, adjustable multiple pieces of pulleys, or based on actual shafts The offset measurement results are obtained by using pulleys of different sizes.

Returning to FIG. 54, the inner core 520 is wear-resistant and can be made from a conductive material. The inner core 520 includes a hole 532 configured to couple with the mandrel 240, such as by thread engagement. Other engagement methods may also be used, such as splines, keys, press-fit connections, or the like. The housing 524 is also wear resistant and can be made from a conductive material. The housing 524 includes an outer surface 534 configured to engage one of the belts 162.

The intermediate core 522 is formed from a non-conductive material, which in one specific example is an insert molded plastic. The outer surface 536 of the inner core 520 and the inner surface 538 of the outer casing 524 include features that prevent the intermediate core 522 from sliding about the inner core 520 or the outer casing 524. Features include, but are not limited to, embossing, splines, dovetails, protruding structures, anti-sliding structures, locking structures, or the like.

As depicted in FIG. 54A, the housing 524 in this particular example includes a dovetail-shaped spline 540. The outside exhibits an angle 542 of about 6 °. This provides increased locking, which is beneficial when materials that exhibit different thermal expansion and contraction characteristics are used. Therefore, when the intermediate core 522 is formed, the complementary dovetail structure is formed in the intermediate shell as depicted in FIG. 54. Therefore, the outer and inner components of the pulley define a plurality of dovetail connections therebetween.

In other specific examples, all plastic pulleys, anodized aluminum pulleys, or plastic overmolded pulleys are used to provide electrical isolation between the mandrel 240 and the belt 162.

In some specific examples, a non-conductive belt is used instead of the conductive belt 162. In this specific example, a conductive pulley is available for a non-conductive belt. In another specific example, a conductive belt may be used for both a conductive pulley and a non-conductive pulley.

The motor assembly 160 shown in FIG. 6 is thus isolated from the spindle 240 by a pulley 192. As depicted in FIG. 6, the motor assembly 160 is further manufactured by a pulley similar to the pulley 192 166 is isolated with a non-conductive intermediate core 580 between the inner core 582 and the outer shell 584.

Although the motor assembly 160 is thus electrically isolated from the spindle 240 and the saw blade 118, the motor can generate electromagnetic interference. Therefore, the motor assembly 160 is configured to reduce potential transmission of interference electromagnetic energy. As depicted in FIG. 6, the power shaft 168 is radially supported within the housing 586 by bearings 588. The other end of the power shaft 168 is radially supported in the motor gear housing 176 by a bearing 590. The offset drive shaft 164 containing the gear 170 is supported radially in the motor gear housing 176 by a bearing 592. The bearing 594 is supported by the cover plate 596. The cover plate 596 is attached to the motor gear housing 176 and encloses the gear 170 and positions the gear 170 to be driven by the armature pinion.

If all of the aforementioned components are made of metal, the motor assembly 160 will act like an antenna and transmit noise that can interfere with the sensing system. Specifically, the offset drive shaft 164 (also referred to as a gear shaft) and bearings 588, 590, 592, and 594 all transmit noise, and if coupled to, for example, a motor gear housing 176, a motor housing 586, or a cover plate 596 Large components, the noise will be transmitted near the sensing system (if their components are made of metal). In order to reduce interference with the sensing system, the motor gear housing 176, the housing 586, and the cover plate 596 are therefore made of plastic, thereby significantly reducing the noise transmitted by the motor assembly 160. In an alternative specific example, a non-metallic barrier is positioned between the shaft / bearing and the cover / gear housing.

In addition to interference from electrical noise, the motor assembly 160 also generates carbon dust that can interfere with the operation of sensing systems including the CCP 262. For example, carbon dust from universal motor brushes can accumulate on components and can form a conductive path that will affect the sensing system. Therefore, unlike a typical motor housing, the motor gear housing 176 is provided with a number of radial vents 610 (as shown in Figure 55). The radial vent 610 splits the cooling air axially driven by the fan 612 (see FIG. 6) and radially splits the air. Therefore, apply force to the fan drive in a direction away from electrically isolated components including CCP 262 Any carbon entrained in the air, thereby reducing the possibility of carbon dust accumulating between isolated components.

In some specific examples, additional reduction of electrical noise interference is achieved by incorporating electronically rectified motors instead of AC universal motors. Electronically rectified motors provide a more consistent level of noise that is easier to mitigate and reduce the noise that is generated. Other noise reduction features include the merger of ceramic bearings instead of plastic bearing isolators, such as the local isolation of saw blades by the use of non-conductive saw blade washers, the isolation of gear-to-pulley shafts from thermosets or thermoplastics, and non-conductive coupling The shaft on the shaft, the non-conducting mandrel or the aluminum gear housing with isolated bearings.

The fence 114 of FIG. 1 is also configured to reduce potential interference with the sensing system. Specifically, the fence 114 is removably and removably attached to a rail 620/622 mounted to the workpiece support surface 108. The fence 114 is in electrical communication with the workpiece support surface 108 as appropriate. Because the fence 114 is movable, the fence may be in contact with the saw blade 118 or the chopper 116 (or an associated pawl). In order to reduce the possibility of unintentional contact that can affect the sensing system, the sides and top of the main portion of the fence 114 are formed with isolation components 624, 626, 628, respectively. This allows the internal components and the end portions of the fence 114 to be formed from metal.

In one specific example, one or more of the isolation components 624, 626, 628 can be removed and reinstalled by a user to allow the use of a custom fixture or fixture with a tool. In another specific example, a single isolation component is used. An isolation component can be "U" shaped to cover all three surfaces or only one side of the fence.

In another specific example, the main part of the fence is overmolded with an insulation material. In some specific examples, the cleaver and associated claws are isolated from the shield signal, or are formed from a non-conductive material. In some specific examples, the isolation assembly 628 is omitted and the recoil pawl is provided with a "locking" feature, similar to that shared with an overhead protection member locked to prevent contact with the top of the fence. The same characteristics. In another specific example, the isolation assembly 628 is omitted, and the fence is configured to extend only across the workpiece support surface 108 to a position where it cannot contact the recoil pawl.

The throat plate 122 of FIG. 1 is also configured to reduce electrical interference, as explained with reference to FIG. 56. The throat plate 122 includes an insert receiving area 640 in which one of the inserts 642 is mounted. The throat plate 122 is configured to fit within a throat plate opening 334 in an upper surface of the workpiece support surface 108. The throat plate 122 is removably mounted to the workpiece support by first inserting two tabs 646/648 in a groove (not shown) in the workpiece support surface 108 or under the lip (not shown) of the workpiece support surface 108 Surface 108. The knob 650 is then rotated to lock the throat plate 122 in place.

The knob 650 has a main body portion 652 and a valve stem 654. The body portion 652 is rotatably positioned in a knob well 656 in the workpiece support surface 108. The valve stem 654 extends through a hole (not shown) in the knob well 656 to the underside of the workpiece support surface 108. The spring assembly 658 is positioned below the workpiece support surface 108 and on the valve stem 654 (see FIG. 57), so that the main body portion 652 and the bottom of the knob well 656 are biased.

Turning to FIG. 58, the main body portion 652 of the knob 650 includes two finger holes 660, a locking cam 662, and a lifting cam 664. The finger holes 660 provide an area for the user to make full use of in order to rotate the knob 650. In other specific examples, other geometries are provided to allow a user to get the most out of it. In some specific examples, the main body portion includes a coupling feature that allows a tool such as a screwdriver, internal hexagon wrench, or other tool to engage the knob 650 when rotation of the knob 650 is required.

The cams 662 and 664 selectively engage the cam ramp 666 in the knob recess 668 of the throat plate 122 shown in FIG. 59. By turning the knob 650 in a clockwise direction, the cam 664 is lifted under the cam ramp 666 to force the throat plate 122 upward to allow use This makes it easier to grasp and remove the throat plate 122. The knob 650 rotates the lock cam 662 on the top of the cam ramp 666 in a counterclockwise rotation, thereby locking the throat plate in place.

In a specific example, the knob 650 and the throat plate 122 are made of plastic to prevent interference with the sensing system. In areas subject to increased wear, metal inserts such as insert 642 may be used to provide increased wear resistance. These metal inserts are insulated from the workpiece support surface 108 by a plastic throat plate 122.

Removal of the throat plate 122 is typically required in order to facilitate changes in the saw blade 118. Therefore, the user only rotates the knob 650 in a clockwise direction to force the throat plate 122 upward (as described above) and then remove the throat plate to expose the mandrel nut 336 (as depicted in FIG. 21). Because the steering arm assembly 194 is supported only by the latch 300 (see FIG. 29), it may be possible for a user to inadvertently remove the steering arm assembly 194 when loosening or tightening the spindle nut 336. For example, when a mandrel nut is turned in a tightening direction using a saw blade wrench, a torque is generated, and the torque acts on the steering arm rotation 272 in a direction that is in opposition to the supporting force of the latch spring 308, and can be Cause de-latching. The mandrel lock 250 is used to prevent this unlatching, as described below.

Referring to FIG. 15B, once the throat plate 122 is removed, the user pushes the activation arm 252 in the direction of the arrow 670. Referring now to FIG. 21, as the actuating arm 252 is pushed in the direction of arrow 670 of FIG. 15B, the flange 248 compresses the spring 246 and exerts a force on the spindle lock 250 in the direction of arrow 672. The mandrel lock 250 is thus slid along the shoulder screw 258 and the mandrel 240 by means of the guide groove 260 and the mandrel groove 256.

As the mandrel lock 250 moves to the left (as depicted in Figure 15B), the narrow portion 674 of the mandrel slot 256 moves into the notch 676 in the mandrel 240, thereby locking the mandrel, which allows the user to rotate the heart Shaft nut 336 (see Figure 21).

In addition, the locking ramp 254 is positioned on the locking ramp 364 as depicted in FIG. 60. Since the locking ramp 364 is part of the pyrotechnic cover 332 mounted to the height adjustment bracket 142, the steering arm assembly 194 cannot be latched from the latch 300, even when the spindle nut 336 is tightened. In alternative specific examples, the spindle lock is interfaced with other components attached to the height adjustment bracket 142 or a portion of the height adjustment bracket.

The removal of the throat plate 122 further allows the user to reset the steering arm assembly 194 in the event that the steering arm assembly 194 is delatched from the latch 300 as a result of the saw control unit or other de-latching. As shown in FIG. 61, the steering arm assembly 194 can be reset by first pushing the reset lever 416 in the direction of arrow 678. This moves the upper latch 404 and the lower latch 402 (as described above with reference to FIG. 36). (Described), thereby allowing the steering arm assembly 194 to orbit up. The user then positions the saw blade wrench 680 around the spindle nut 336 or spindle 240 to pull the steering arm assembly 194 back to the latched position, as described above with respect to FIGS. 26-29.

In some specific examples, the steering arm assembly 194 is raised using a push rod or some other extraction tool. In another specific example, a handle is provided on the steering arm assembly itself. In still other specific examples, the steering arm assembly 194 is automatically raised, such as by using energy stored during movement of the steering arm assembly 194 after de-latching. In some of the specific examples, some of the energy from the movement of the steering arm assembly is stored in a spring positioned at the surface 374.

The HMI unit 124 of FIG. 1 is shown in more detail in FIG. 62. The HMI unit 124 includes a housing 700, an access point 702 (a near field communication (NFC) access point described herein), and a number of status indicators 704. Other types of communication protocols, such as Bluetooth, zigbee, Wi-Fi, data protocols, mobile protocols, ultra-wideband (UWB) protocols, or any frequency band are possible. The cover 700 protects other components of the HMI unit 124 while providing access to the components of the HMI unit 124 User access. The NFC access point 702 is a location where an electronic device such as a smart phone can be located for transmitting data from the transceiver of the HMI unit 124 to the smart phone. To this end, the user's smartphone has an application including a communication protocol. The user can use the NFC access point 702 to obtain the current status of the table saw 102 and the unique identification information of the table saw. The application can then be used to obtain maintenance recommendations, reset procedures or troubleshooting procedures, and to provide registration for table saws. The app can further lock or unlock the system. For example, the application is used to lock or unlock one or more of the bypass switch and the motor power switch using a personal identification number or code.

The status indicator 704 is used to provide the user with a desired alarm or status indicator. In some specific examples, the status indicator 704 indicates available power, safety systems in the bypass, safety or system errors that can be corrected by the user, and safety or system errors that can be corrected by the service center. In various specific examples, more or less status indicators 704 are provided. The configuration of the HMI unit 124 implements a viewing status indicator 704 even under bright daylight, as discussed further with reference to FIG. 63.

As shown in FIG. 63, the status indicator 704 is illuminated by four LEDs 706 on a printed circuit board (PCB) 708. In some specific examples, the LEDs 706 are each provided as a colored LED having a color different from the others of the LEDs. An NFC antenna 710 is also provided on the PCB 708. The PCB 708 is supported by a support 712 attached to the housing 700. The spacer 714 is attached to the support 712 by a number of clips 716. The spacer 714 includes a number of wells 718 that include openings (not shown) at the lower portion of the well 718 that receive each of the LEDs 706. The spacer 714 provides a proper distance between the LED and the diffuser 720, and a proper distance between the NFC antenna 710 and the smart phone access point 702. The well 718 of the spacer 714 also prevents light seepage between different colored LEDs 706. The well 718 of the spacer 714 further includes one or more openings or Aisle 719. These aisles transport the dust away from the LED 706 by the channel, thereby preventing the LED 706 from being covered.

The diffuser 720 includes a number of lenses 722, each lens being associated with a respective one of the wells 718. The diffuser 720 maintains LED brightness while diffusing light to look uniform across exposed surfaces. The diffuser 720 is made of a material resistant to scratches and chipping.

Although some components of the table saw 102 are thus configured to provide ease of access or use, user access to or use of some components is not required. By way of example, the PCB 452 must be accessible electronically by the service technician during the assembly of the table saw 102 and in some cases, but should not be accessed by the user. Therefore, the USB port 458 is positioned to provide access for technicians while restricting access to users, as discussed initially with reference to FIG. 64.

In FIG. 64, the table saw 102 is depicted as having a zero bevel. Therefore, the dust port 730 is positioned adjacent to a lower end portion of the dust port receiving groove 732 in the base cover 106. The dust port 730 is part of a dust shield 734 attached to the bevel frame 134 (not visible in FIG. 64). In this position, the external cover 454 and the USB port 458 of FIG. 42 are not visible to the user.

FIG. 65 depicts a rear view of the table saw 103 when the table saw 102 is positioned at a forty-five degree bevel (the dust shield 734 is not depicted in this view). At this position, the external cover 454 and the USB port 458 can be viewed through the dust port access slot 732. Therefore, the USB port 458 can be accessed by a service technician. However, since the user is not expected to look frequently through the dust port access slot 732 at the angle depicted in FIG. 65, the user will generally not see the USB port 458. Therefore, the USB port 458 is blocked from the user in most situations.

In some specific examples, access to the USB port 458 is further protected, such as by providing a protective plastic or rubber plug 736 (Figure 66) or using a tamper resistant screw 740 (Figure 67) Tighten the lid 738. In some specific examples, the outer cover 454 must be removed to provide access to the PCB 452.

Although the invention has been illustrated and described in detail in the drawings and foregoing description, it should be regarded as illustrative and not restrictive in its features. It should be understood that only preferred specific examples have been presented, and all changes, modifications, and further applications within the spirit of the present invention need protection.

Claims (11)

A power tool assembly comprising: a workpiece support surface; and a steering arm assembly that can extend along a portion of a forming device supported by the steering arm assembly above the workpiece support surface. A drop path movement between the position of the arm assembly and a position of the second steering arm assembly where the portion of the forming device does not extend above the workpiece support surface; a latch which can A first latch position of the second steering arm assembly position moving to the first steering arm assembly position and the steering arm assembly is movable from the second steering arm assembly to the first steering arm assembly One of the positions to move between second latch positions; an actuator housing configured to receive the actuator device; and a reaction plug configured to selectively seat the actuator housing Together, the reaction plug is configured such that when the actuator device is installed in the actuator housing and the reaction plug is moved from an unoccupied position to a fully seated position, the reaction plug Force the actuator device to lock the Moves to the second position of the latch from the first latch position. For example, the power tool assembly of the first patent application scope further includes: a biasing device configured to bias the latch toward the first latch position. For example, the power tool assembly of the second patent application range, wherein the biasing device and the latch are configured so that when the reaction plug is moved from a fully seated position to a non-seated position, the biasing device A force is applied to the latch to oppose the actuator device positioned inside the actuator housing, thereby moving the actuator device in a direction outward from the actuator housing. For example, the power tool assembly of claim 3, wherein the actuator housing includes a slit on a motor side of the actuator housing configured to receive an actuator sleeve therein. A portion, and the movement of the actuator device in the direction outward from the actuator housing causes a portion of the actuator sleeve outside the actuator housing to be raised above the actuator Fingerboard part of one of the covers. For example, the power tool assembly of the scope of application for patent No. 3, wherein the reaction plug is configured to engage the actuator housing in a threaded manner. For example, the power tool assembly of the first patent application range, wherein the latch includes: a latch pin storage area configured to receive a latch pin of the steering arm assembly; and A lower portion, which is located under the latch pin storage area, and the lower portion is configured such that when the latch is in the second latch position, the lower portion is located in the drop path so that the steering arm The movement of the assembly from the position of the second steering arm assembly toward the position of the first steering arm assembly causes the latch pin to contact the lower portion, thereby moving away from the first latch position in a direction away from the first latch position. The second latch position moves the latch. For example, the power tool assembly of the sixth scope of the patent application, wherein the lower part is configured such that when the latch is in the first latch position, the lower part is located in the drop path so that the steering arm assembly The movement from the position of the second steering arm assembly toward the position of the first steering arm assembly causes the latch pin to contact the lower portion, thereby preventing the steering arm assembly from facing the first steering arm assembly position. It moves further. For example, the power tool assembly according to item 7 of the patent application, wherein the actuator device includes a pyrotechnic device. For example, the power tool assembly of the eighth patent application scope further includes: a control system configured to actuate the pyrotechnic device in response to a sensed unsafe condition. For example, the power tool assembly according to item 9 of the patent application scope, further comprising: an electrical connector configured to be connected to a plug of the starting device; and a connecting wire including a permanent attachment at one end Connected to a first end of the electrical connector and permanently attached to a second end of the control system. For example, the power tool assembly of the scope of application for patent No. 10, wherein: the connecting wire extends through an opening in the reaction plug; and the electrical connector is sized so that the electrical connector cannot move through the opening.