Abstract: A power tool having an integrated control system includes a workpiece supporting surface, a cutting instrument extendable above the workpiece supporting surface, a guard assembly securable above the workpiece supporting surface for covering at least a portion of the cutting instrument, a motor coupled with the cutting instrument, and a power switch operable for starting the motor for driving the cutting instrument. The power tool includes a control system in communication with the guard assembly for determining if the guard assembly is installed. Before the motor is started, the control system automatically disables the motor if it determines that the guard assembly is not installed. The control system includes a bypass switch for enabling starting of the motor when the guard assembly is not installed.

Abstract: A dust collection nozzle extends from the front of a fixing cover parallel to a base below an upper end of an electric motor. Heavy and large cutting dust can be immediately collected from an area relatively close to a cutting position of a portable cutting device cutting a workpiece immediately after dust is generated due to the cutting, which can in turn improve dust collection efficiency of a dust collection device to which the dust collection nozzle is attached.

Abstract: A corrugated paperboard sheet processing apparatus for processing a corrugated paperboard sheet being conveyed. The apparatus includes a threaded shaft and a support assembly supported by the threaded shaft. The apparatus further includes a processing module supported by the support assembly. The processing module includes a width-direction movement motor for rotating a rotor provided in the support assembly, a processing tool for performing a given processing on the corrugated paperboard sheet, a processing tool drive device for driving the processing tool to perform the given processing, and an up-down movement motor for moving the processing tool in the up-down direction. The processing module is formed to define itself as independent and separable from the support assembly.

Abstract: A power table saw has a saw blade driven by a motor with power selectively supplied to the motor by actuation of a switch. A riving knife is selectively positioned in an extended position and a retracted position relative to the blade. A blade guard is removably mounted to the riving knife above the blade. A sensible element on the riving knife can be detected by a first sensor when the riving knife is retracted, the first sensor has a non-null state when the sensible element is adjacent the first sensor and a null state otherwise. A second sensor has a null state when the blade guard is detected and a non-null state otherwise. A controller determines the states of the sensors and disengages power to the motor when the switch is actuated when the states of the sensors are different.

Abstract: An anti-kickback device includes a riving knife mounted rearwardly of a saw blade of a table saw machine and having a retaining hole. An elongate mount has a cavity and an insert groove to receive the plate body such that the retaining hole is located in the cavity. A fastening unit includes a post which is received in the cavity, which straddles a top surface of the knife, and which has a radial bore registered with the retaining hole, a detent body disposed in the radial bore and movable to extend into or to be clear of the retaining hole to thereby permit the mount to be secured to or detached from the knife, a tubular actuator which has an inner cam surface configured to move the detent body, and an operating member manually operable to move the actuator.

Abstract: A detachable protective device for a table saw includes a cutter board having first and second recesses. The second recess includes a receiving portion having a first width and a neck having a second width smaller than the first width. A base is mounted to the cutter board and includes first and second holes. A pivot is mounted in the first hole and is releasably engaged with the first recess. A locking member includes a pivotal portion pivotably received in the second hole. The pivotal portion has a maximal width larger than the second width and not larger than the first width and has a minimal width not larger than the second width. The pivotal portion is retained in the second recess when the locking member is in the locking position. The pivotal portion can disengage from the second recess when the locking member is in the release position.

Abstract: A cutting machine can include a cutting machine body that is movably supported above a table and capable of vertical movement, the cutting machine body can be positioned at an upward waiting position and a lower end position. The cutting machine body can include an auxiliary cover positioned around a portion of a blade and including a projection. When in the upward waiting position the auxiliary cover is not able to move upward because of the position of the projection, and in the lower end position the auxiliary cover is able to move upward.

Abstract: A geotextile cutting apparatus having a lifting arm and cutting disk capable of cutting uniform width strips of geotextile material in the field. The uniform width strips of the geotextile material are then collected on a bobbin held and rotated by powered spindles on a variable width yoke of a collection apparatus, thus collecting the previously cut uniform width of geotextile material into compact rolls. The method of collecting geotextile material in the field having the steps including, cutting the material into uniform strips with a lifting arm having a cutting disk and then collecting those uniform strips on a rotating bobbin held and turned by rotating spindles on a variable width yoke.

Abstract: A cutting tool includes a tool unit having a rotary circular blade, a movable cover mounted to the tool unit and having a cover body movable in a moving direction to cover and uncover a part of the rotary circular blade by the cover body, and a position adjusting mechanism configured to adjust the position of the cover body of the movable cover in an adjusting direction different from the moving direction.

Abstract: A table saw guard assembly for guarding a blade on a table saw is provided. The table saw guard assembly includes a support structure and a hood assembly including at least one of a front curtain, first side curtain, second side curtain and top curtain, wherein each of said curtains are independently moveable and/or removable from the hood assembly. Furthermore, a table saw guard assembly is provided including a quick release mechanism for connecting the hood assembly to the support structure.

Abstract: Table saw blade guards, splitter assemblies, attachments, accessories, and table saws including the same. The splitter assemblies include a splitter and a blade guard that is coupled to the splitter. The blade guards include a top guard. In some embodiments, the top guard is configured to be a hold-down guard. In some embodiments, the top guard is pivotally coupled to the splitter. In some embodiments, the top guard is adjustably coupled to the splitter. In some embodiments, the top guard is secured in a fixed orientation relative to the splitter. In some embodiments, the top guard includes a portion that is secured in a fixed orientation to the splitter and a portion that is pivotal relative to the splitter.

Abstract: The combined dual bevel miter and radial arm saw device provides the advantages of both a radial arm saw and a miter saw. The device thereby provides for cross cuts, rip cuts and angle cuts, all simultaneously if desired.

Abstract: A safety structure for rotary paper trimmer comprises a carriage, a cartridge, a blade holder, a locking means, an unlocking means, a biasing means and an actuating means. The blade holder is received inside the cartridge for holding a cutting blade and slides downward to expose a cutting edge of the cutting blade outside the cartridge during cutting operation. By means of the cooperation among the locking means, the unlocking means, the biasing means and the actuating means, the cutting edge is ensured to be concealed completely inside the cartridge when the cartridge is removed from the carriage and when the carriage cover is not pressed by the user, therefore preventing the cutting edge from injuring the user when the rotary paper trimmer is not in use.

Abstract: A table saw is disclosed. The table saw includes a table top including an opening configured to receive a saw blade, a blade case positioned under the table top, the blade case including an interior portion with the saw blade partially positioned within the interior portion, the blade case configured to move relative to the table top, a motor coupled to the saw blade and configured to move relative to the table top, the saw motor configured to rotate the blade about a blade axis, and at least one moveable guard member positioned between the table top and the blade case, the at least one moveable guard member providing an obstruction to the interior portion of the blade case, and the at least one moveable guard member configured to pivot about a pivot axis when the motor is moved up or down or tilted relative to the table top, wherein the pivot axis is substantially perpendicular to the blade axis.

Abstract: A power miter saw of the type which has an upper fixed blade guard and a lower swinging blade guard for covering the lower reach of an installed blade when the saw is in its rest position and for exposing the lower reach of the saw blade when moved to its operational position, the saw comprising an adjustable length elongated linkage mechanism interconnecting a frame support and the lower blade guard for moving the lower blade guard in response to movement of the saw between the rest and operational positions, such that the lower blade guard covers the lower reach of the blade when the saw is in its rest position and uncovers the blade when the saw is moved to its operational position, the linkage mechanism permitting the exposure of a blade arbor to facilitate changing of the blade.

Abstract: Table saws and table saws designed to implement safety systems that detect contact between a person and a dangerous portion of the saw are disclosed. Table saw components, mounting systems for table saws, and table saw attachments are also disclosed. One embodiment may include a first clamp surface, a second clamp surface spaced apart from the first clamp surface so that a base portion of a riving knife or splitter can be placed between the clamp surfaces with the opposing sides of the base portion generally parallel to the first and second clamp surfaces.

Abstract: A blade guard for a circular saw blade. The blade guard includes at least two pieces coupled together. The blade guard also includes at least one bottom plate having a slot formed therein for accommodating the circular saw blade and at least one top cover. Additionally, the blade guard includes a plurality of fastening rods for coupling the bottom plate with the top cover, the plurality of fastening rods further configured to secure the at least two pieces to the at least one bottom plate and the at least one top cover.

Abstract: A safety guard assembly for use on a handheld power saw is disclosed. The assembly includes a safety guard, a locking mechanism, and a weight. The safety guard is swingably mounted on the hood of the saw. The locking mechanism allows the guard to be swung to an open position and locked in position. In a kick-back situation, the locking mechanism quickly releases. The weight forces the guard to swing rapidly down over the guard, thereby providing protection from the saw blade.

Abstract: An apparatus for machining a weld tab on an article. In one embodiment, the apparatus includes: a base member including at least one rolling element for contacting an underlying surface, the base member having a leading end and a trailing end; a cutting apparatus operably connected to the base member, the cutting apparatus including: a cutting member positioned proximate the leading end of the base member, the cutting member sized to coincide with a size of the weld tab; and a handle member proximate the trailing end and operably connected to the cutting member, the handle member for modifying a position of the cutting member relative to the base member.

Abstract: A covering device for a cutting machine includes a fixing cover provided on a base and covering a disc-shaped rotary tool provided at an end of the cutting machine. The fixing cover includes a tiltable body coupled to the fixing cover such that the tiltable body can be tilted in an up-down direction. The amount by which the rotary tool projects downward from the base can be changed by changes of the tilt position of the tiltable body with respect to the fixing cover. The fixing cover further includes a variable member having a plurality of abutment portions that are brought into abutment with the tiltable body along with a downward tilt of the tiltable body, and allows the tilt position to be selected from different tilt positions in accordance with an operation to select from the plurality of abutment portions.

Abstract: A power tool in one embodiment includes a latch hold mechanism, a swing arm pivotable about a pivot along a swing arm path, at least one alignment plate positioned adjacent to a portion of the swing arm when the swing arm is in a first position, a latch pin movable between a first latch pin position whereat the swing arm is biased against the at least one alignment plate and a second latch pin position whereat the swing arm is not biased by the latch pin, an actuating device configured to transfer a force to the swing arm resulting in a bias on the latch pin in a direction toward the second latch pin position, and a control system configured to control the actuating device to transfer a force to the swing arm when the swing arm is maintained at the first swing arm position.

Abstract: A power tool in one embodiment is a table saw which includes a swing arm assembly movable along a swing path, an actuator configured to force the swing arm assembly away from a first swing arm position and toward a second swing arm position, and a riving knife positioned outwardly of the swing arm assembly when the swing arm assembly is in the first swing arm position, the riving knife including a channel with a first end portion and a second end portion, a first curved channel portion with a first center of curvature and located between the first end portion and the second end portion, and a second curved channel portion with a second center of curvature and located between the first end portion and the second end portion, wherein the first center of curvature is not coincident with the second center of curvature.

Abstract: Drive unit with a rotating saw blade which is hinged inside of a protective hood, for connection to a robot, shaped by an enclosure that can be connected to the robot in which a shaft is positioned, by means of which the saw can be powered under intermediate connection to a gearbox. The saw blade is held between two firmly connected internal rings which are arranged on both sides of the saw blade and contain it, as well as being connected to each other. The rings are rotatably mounted within non-rotating external rings that are connected to the protective hood. The device that is formed by the saw blade, the internal rings and the external rings is fastened in a removable way to a drive hub that is powered by the gearbox.

Abstract: Throat plates for table saws and table saws including the same are disclosed. In some embodiments, the throat plates and/or saws include at least one securement mechanism adapted to secure and prevent inadvertent removal of the throat plate from the throat of the saw. In some embodiments, at least one of the securement mechanisms also provides a height adjustment mechanism and/or prevents vertical removal of the throat plate. In some embodiments, the throat plate includes an accessory mounting port that provides a portal for accessories, including safety accessories, to extend through the plate from beneath the table of the saw. In some embodiments, the port extends from the plate's outer perimeter to divide the plate's rear end portion into a pair of spaced-apart members. In some embodiments, these members are independently secured to the table saw and retained apart from each other by one or more of the securement mechanisms.

Abstract: A table saw includes a base assembly, a table assembly supported by the base assembly, a saw assembly having a blade extending through the table assembly, and a riving knife assembly connected to the saw assembly. The riving knife assembly has a removable riving knife, and a riving knife locking mechanism for locking the riving knife in the riving knife assembly. A handle is mounted to the base assembly or the table assembly, and is connected to the riving knife locking mechanism for releasing the riving knife without using additional tools.

Abstract: A protective cover structure of a desk sawing machine includes a chopper board, a cover, two first side boards and two second side boards. The cover is disposed at an upper end of the chopper board. The two first side boards respectively disposed at two sides of the cover. One end of each of the first side boards is pivotally connected to the cover. The two second side boards respectively connected to another end of each of the first side boards. The first side boards and the second side boards can be operated independently to enhance shelter. The desk sawing machine can keep off the sawdust when cutting, providing a protective effect to the equipment and the user.

Abstract: A saw blade protector for a cutting device having a table for placing thereon a workpiece, a saw blade protruding from an upper surface of the table, and a riving knife disposed in front of the saw blade in a moving direction of the workpiece for cutting the workpiece and positioned in line with the saw blade. The saw blade protector includes a guard plate constructed to cover the saw blade, a holding frame constructed to be mounted on an upper portion of the riving knife and to be able to support the guard plate, and an adjusting device constructed to be able to adjust a position of the holding frame relative to the upper surface of the table.

Abstract: A guard member for a rotary blade of a tabletop cutting machine is attached with a fixing device. The fixing device may be loosened, for example, during a maintenance operation. The fixing device can be prevented from falling out of the table cutting machine through the use of a fall-out preventing device.

Abstract: A support structure for a splitter of a cutting tool includes a lock device and a moving device. The lock device can lock and unlock the splitter at a storage position. The moving device can move the splitter from the storage position to an ejected position, in which a part of the splitter extends above an upper surface of a table of the cutting tool, when the lock device unlocks the splitter at the storage position.

Abstract: A food product slicer knife includes a circular knife body with a peripheral cutting edge. A central opening passes through the knife body and includes a pair of diametrically opposed outwardly extending slots. The knife body also includes at least one set of diametrically opposed drive pin receiving openings spaced outwardly of the central opening and circumferentially offset from the diametrically opposed outwardly extending slots. A tool assembly is adapted to facilitate knife installation and removal and holds the knife when removed from a slicer. A food product slicer includes a knife mount hub adapted to cooperate with the knife to hold the knife on the slicer during operation.

Abstract: In at least one form of the invention, a clamp can be used to attach a saw accessory to a saw. In various embodiments, the clamp can comprise first and second clamping members, an actuator, and a controller. In various embodiments, the saw accessory can be disposed between the first and second clamping members where at least one of the first and second clamping members can be moved by the actuator in order to clamp the saw accessory therebetween. In at least one such embodiment, the controller can be in electrical and/or fluid communication with the actuator to activate the actuator. In various embodiments, the controller can be activated by an operator from a location proximate to the operator but remote from a blade of the saw.

Abstract: A table saw is disclosed. The table saw includes a table top including an opening configured to receive a saw blade, a blade case positioned under the table top, the blade case including an interior portion with the saw blade partially positioned within the interior portion, the blade case configured to move relative to the table top, a motor coupled to the saw blade and configured to move relative to the table top, the saw motor configured to rotate the blade about a blade axis, and at least one moveable guard member positioned between the table top and the blade case, the at least one moveable guard member providing an obstruction to the interior portion of the blade case, and the at least one moveable guard member configured to pivot about a pivot axis when the motor is moved up or down or tilted relative to the table top, wherein the pivot axis is substantially perpendicular to the blade axis.

Abstract: A quick release device for a saw blade guard assembly in a circular saw includes a mounting block having two spaced sidewalls, a mounting groove defined between the two sidewalls for receiving a spreader, and two through holes respectively defined through the sidewalls and in communication with the mounting groove and a locating hole. At least one movable engagement member is movably disposed in the through hole of the mounting block. A locking member having two spaced locking blocks mounts onto the mounting block. Each of the locking blocks has a retaining wall portion for engaging the at least one movable engagement member and forcing the at least one movable engagement member to be held in the locating hole of the spreader.

Abstract: A miter saw is disclosed having a base, a blade supported by the base, a detection system adapted to detect a dangerous condition between a person and the blade, and a reaction system associated with the detection system to cause a predetermined action to take place upon detection of the dangerous condition. The blade is rotatable, and moves into a cutting zone to cut a workpiece. The predetermined action may be to retract the blade from the cutting zone.

Abstract: Embodiments are directed to a modular saw guard system for a power saw having a top and a vertically adjustable blade, the system comprises a riving knife mechanism, a blade guard mechanism that is releasably mounted to the riving knife mechanism when the riving knife mechanism is at least in its extended position, the blade guard mechanism generally covering the blade and being adjustable to enable a work piece to be moved into cutting position by the blade and a kickback prevention mechanism that is releasably mounted to the riving knife mechanism when the riving knife mechanism is at least in its extended position, the kickback prevention mechanism being configured to engage a work piece as it is being cut by the blade and apply resistance to prevent the work piece from being expelled in the reverse direction.

Abstract: A saw assembly for a table saw includes a bracket, a driving unit swingingly connected with the bracket, a saw blade coupled to a driving shaft of the driving unit, which extends through an inclined guide slot of the bracket, an elevating unit mounted with the bracket and connected with the driving unit, and a shield pivotally mounted between the driving unit and the saw blade. When the driving unit is lifted or lowered by the actuation of the elevating unit, the saw blade can be moved upwards or downwards along the inclined guide slot of the bracket, and the shield can be rotated to keep the inclined slot of the bracket covered, thereby preventing a maintenance worker's hand from getting injured by the saw blade, and allowing the sawing chips of a workpiece to be collected effectively.

Abstract: The present invention discloses a guard assembly for a saw blade, which includes an inner guard portion and an outer guard portion. The inner and outer guard portions define a containing space therebetween. A circular saw blade includes two parallel sides and a rotating axis perpendicular to the two sides. At least a portion of the saw blade is located within the containing space. The outer guard portion is pivotally connected with the inner guard portion about a pivotal axis which is substantially parallel to each side of the blade. The improved guard assembly, which can be opened laterally, is convenient to change the saw blade and to clean the inner of the guard.

Abstract: In at least one form of the invention, a clamp can be used to attach a saw accessory to a saw. In various embodiments, the clamp can comprise first and second clamping members, an actuator, and a controller. In various embodiments, the saw accessory can be disposed between the first and second clamping members where at least one of the first and second clamping members can be moved by the actuator in order to clamp the saw accessory therebetween. In at least one such embodiment, the controller can be in electrical and/or fluid communication with the actuator to activate the actuator. In various embodiments, the controller can be activated by an operator from a location proximate to the operator but remote from a blade of the saw.

Abstract: Table saw blade guards with lateral guards, blade guard assemblies, and table saws including the same. The blade guards include at least one lateral guard that restricts access to a lateral side, or face, of the saw's blade, and may include a top guard. The lateral guard is selectively moved, such as responsive to engagement by a workpiece, between a non-cutting position and a plurality of cutting positions. In some embodiments, the lateral guard is a collapsing lateral guard that has a reduced perimetrical area and/or reduced vertical dimension relative to the saw's work surface when in a cutting position compared to the non-cutting position. In some embodiments, the lateral guard collapses toward the top guard when moved from its non-cutting position to a cutting position. In some embodiments, the lateral guard does not, or does not appreciably, project above the top guard even when in its maximum cutting position.

Abstract: The invention is based on a machine tool, in particular a circular power saw, for machining a workpiece, having a covering (10) for guarding a user against machining residues of the workpiece that occur in operation and having an adjustable residue guide (12, 14) for carrying away at least some of the machining residues through an outlet opening in a defined direction in accordance with the position of the residue guide (12, 14). It is proposed that the residue guide is adjustable in such a way that in one position of the residue guide (12, 14), at least some of the machining residues are carried onward inside the covering (10).

Abstract: A device for mounting a cover of a cutting blade to a riving knife may have an engaging member for releasably engaging at least a part of the riving knife from both sides, in a direction of thickness of the riving knife. The engaging member is manually operable without any additional tools. A device for mounting a riving knife to a table saw may include a manually operable lock member and a biasing member. The biasing member is arranged and constructed to normally bias the lock member towards a lock position. The riving knife may be divided into a first knife portion and a second knife portion. A positioning device may position the first knife portion and the second knife portion substantially within a single plate.

Abstract: A protective cover structure of a desk sawing machine includes a chopper board, a cover, two first side boards and two second side boards. The cover is disposed at an upper end of the chopper board. The two first side boards respectively disposed at two sides of the cover. One end of each of the first side boards is pivotally connected to the cover. The two second side boards respectively connected to another end of each of the first side boards. The first side boards and the second side boards can be operated independently to enhance shelter. The desk sawing machine can keep off the sawdust when cutting, providing a protective effect to the equipment and the user.

Abstract: Throat plates for table saws and table saws including the same are disclosed. In some embodiments, the throat plates and/or saws include at least one securement mechanism adapted to secure and prevent inadvertent removal of the throat plate from the throat of the saw. In some embodiments, at least one of the securement mechanisms also provides a height adjustment mechanism and/or prevents vertical removal of the throat plate. In some embodiments, the throat plate includes an accessory mounting port that provides a portal for accessories, including safety accessories, to extend through the plate from beneath the table of the saw. In some embodiments, the port extends from the plate's outer perimeter to divide the plate's rear end portion into a pair of spaced-apart members. In some embodiments, these members are independently secured to the table saw and retained apart from each other by one or more of the securement mechanisms.

Abstract: One aspect of the present invention includes a ripsaw stabilizing device that has a moveable carrier arm subassembly, a hold-down subassembly, a hold-down support engaged to the moveable carrier arm subassembly and a force applying subassembly engaged to the hold-down subassembly and the hold-down support that applies downward force such that downward force is applied to a piece of material being cut on both sides of the blade. Another aspect of the present invention includes a method for making a glue-line quality cut without further processing of the material being cut and without the use of a sacrificial material. Yet another aspect of the present invention includes a ripsaw including one or more ripsaw stabilizing devices of the present invention.

Abstract: A saw includes a rotatable cutting blade having a first side, a second side, an outer edge and a front end region, a motor for driving the cutting blade, and a blade guard covering at least a portion of the blade. The saw has an air deflector assembly positioned in proximity to the front edge region of the cutting blade, the air deflector assembly having a first deflector device positioned substantially adjacent to, but spaced apart from, the first side of the rotatable cutting blade, and a second deflector device. The second deflector device is movable between an operating position whereby the second deflector device is positioned substantially adjacent to, but spaced apart from, the second side of the blade, and a non-operating position wherein the second deflector device is spaced apart from the blade by a greater distance than in the operating position.

Abstract: A table saw guard has opposed rubber fingers extending from opposite supports. The fingers meet near slots in a saw table along a saw slot and provide visual and tactile warning of approaching the saw blade. The fingers bend as a board is pushed into contact with a saw. Friction between the bent fingers and the board resist unwanted bounce-back of the board while being sawed.

Abstract: Embodiments of the invention are directed a guard system for a table saw having a top surface with an opening through which a blade extends for cutting a work piece, the forward reach of the cutting edge of the blade engaging the work piece in a downward cutting direction, the system comprising an upper guard mounted to the table saw and configured to enclose the blade to shield a user from contacting the blade, the upper guard having an outlet adjacent the rearward reach of the blade for connection to a vacuum source, an inlet adjacent to the forward reach of the blade and to the table top surface and an interior channel communicating the inlet to the outlet.

Abstract: A cutting device includes a lock device for locking and unlocking a cover against a cover support. The cover includes a first cover removably mounted to the cover support and a second cover removably mounted to the first cover. The lock device is operable in a first mode, a second mode and a third mode. The first mode prevents the first cover from being removed from the cover support and prevents the second cover from being removed from the first cover. The second mode permits the first cover from being removed from the cover support but prevents the second cover from being removed from the first cover. The third mode permits the second cover to be removed from the first cover.

Abstract: A laser guide for rotating tools comprises a first housing portion and a second housing portion. A seal is provided between the first housing portion and the second housing portion. A lens is located in the first housing portion or second housing portion. A seal is provided between the lens and the first housing portion. A method of testing a laser guide comprising applying a pressure to an internal chamber of the laser guide. Monitoring the laser guide for pressure gains or losses in the chamber.

Abstract: A woodworking machine comprises a base including a lateral wall, a coupled wall having an end coupled to the lateral wall and a working surface provided on a top surface of the lateral wall and having a slot and an indicator, with a thing desired to be cut being placed on the working surface; an active adjustment unit inserted through the lateral and coupled walls; a driven adjustment unit inserted through the coupled wall and engaged with the active adjustment unit; a sensing device connected to the driven adjustment unit and able to sense an adjusted displacement distance of the driven adjustment unit and further convert the displacement distance to a signal and transfer the signal to the indicator; an actuating device where the driven adjustment unit is mounted on; and a saw connected to the actuating device and exposing from the slot.