Abstract: An electric power tool has an electric motor disposed in a main body and a power supply circuit electrically connected to the electric motor by wires to supply electric power to the electric motor. A switch is disposed in the power supply circuit so as to electrically open and close the power supply circuit. A movable member is supported by the main body, a detector is disposed in the main body to detect a movement of the movable member and the switch is configured to electrically open the power supply circuit when the detector detects the movement of the movable member. The wires connected to the electric motor are not connected to the detector so that the length of the wires is shortened.

Abstract: A method and system are provided for automatically portioning workpieces, such as food products, into both shape and other user-defined specification(s). Workpieces are portioned both to shape and weight, such as to a weight-specific uniform shape, by adjusting (e.g., scaling up and down or slightly modifying) a desired template shape until the desired weight is achieved depending on the varying thickness of each workpiece. For example, from a thicker workpiece, a smaller-sized piece having a predefined shape and weight is portioned, while from a thinner workpiece, a larger-sized piece having the same predefined shape and weight is portioned. The system permits a user to scan in and edit a desired (reference) shape to be used as a template in the portioning process.

Abstract: A workpiece cutting method utilizing a band-saw machine, includes the following steps of: guiding tooth tips of an endless band-saw blade provided on the band-saw machine in a direction of a workpiece by a band-saw blade guiding apparatus; and applying vibrations to the band-saw blade in a cutting direction to the workpiece so as to perform cutting of the workpiece by a vibration applying unit provided on the band-saw blade guiding apparatus.

Abstract: The present invention provides cutting methods and cutting apparatus that can precisely cut workpieces in complicated shapes with high aspect ratios regardless of materials of the workpieces. The present invention is cutting methods and cutting apparatus using a wire saw wherein cutting processing is performed for a workpiece by extending a cutting wire on a cutting arm that rotates around a wire's center axis or a real cutting position relative to a fixed section and rotating the cutting arm such that a cutting direction of the wire matches a support direction of a total stiffness that supports the wire.

Abstract: A workpiece cutting method utilizing a band-saw machine, includes the following steps of: guiding tooth tips of an endless band-saw blade provided on the band-saw machine in a direction of a workpiece by a band-saw blade guiding apparatus; and applying vibrations to the band-saw blade in a cutting direction to the workpiece so as to perform cutting of the workpiece by a vibration applying unit provided on the band-saw blade guiding apparatus.

Abstract: The present invention discloses a vibration cutting device and a method for vibration cutting. The vibration cutting device comprises at least one first oscillating heat, a controller, by means of which the first oscillating head can be selectively electrically excited in order to carry out oscillations within a frequency range below the kilohertz range, and a cutting tool disposed between a first and a second fixture, while the first fixture is connected to the first oscillating head such that mechanical oscillations of the first oscillating head can be transferred to the cutting tool.

Abstract: In a method and a system for determining the feeding speed when bandsaw cutting a workpiece, the tooth pitch TP of the bandsaw blade is determined in a first unit depending on the shape and dimensions of the workpiece. In a second unit feeding depth per tooth is determined depending on properties of the workpiece material and the width of the bandsaw blade. The bandsaw blade velocity BS is determined in a third unit from the width W of the workpiece and the hardness of the workpiece material, whereafter the cutting time T is determined in a first calculating unit from the height H of the workpiece, the feeding depth per tooth, the tooth pitch TP and the blade velocity BS. In a second calculating unit the feeding speed MH for the bandsaw blade is then determined by the equation MH=H/T. A computer program, when executed on a computer, performs this determination of the feeding speed when cutting a workpiece with a bandsaw from supplied input data.

Abstract: A method and arrangement for adjusting a feed rate of a crosscut saw (1), in particular, in a harvesting head of a forest machine during the crosscutting of wood (9) in the apparatus. A feed force (F) of the crosscut saw and/or a rotating rate (vchain) of a cutter chain (5) revolving around a guide bar (4) are thus controlled. The control is implemented such that first the feed rate (vfeed) of the crosscut saw (1) is measured at given intervals. By adjusting thereafter the feed force of the actuator (2) controlling the crosscut saw and/or the rotating rate (vchain) of the cutter chain (5) and by determining the effect of the performed adjustment on the feed rate of the crosscut saw any change (?v) in the feed rate and the most advantageous adjustment measure to be performed next is concluded.

Abstract: A horizontal band saw includes a base assembly, a sawing mechanism and a bevel cutting adjustment device. The base assembly includes a frame and a conveyer. The frame has a transverse passage. The conveyer is mounted in the transverse passage of the frame. The sawing mechanism is pivotally mounted on the frame and includes a housing. The housing is pivotally mounted on the frame and has a bottom and a cutting window above the conveyer. The bevel cutting adjustment device is mounted on the frame, connects to the bottom of the housing and is used to pivot the sawing mechanism relative to the conveyer so that the horizontal band saw can make a bevel cut in a workpiece.

Abstract: A band saw with a complex coordination of a tilting motion and a translational motion between the workpiece and the band saw blade, so that a curved cut is made in the workpiece. The geometric parameters of the cut can be continuously adjusted. This makes it possible to optimize a contact length of the saw blade in the workpiece, which is an important factor in the cutting process. It is thus possible to saw workpieces made of stone and similar materials that are typically difficult to cut. The cut and the contact length of the saw blade can be tailored individually to each workpiece to be sawed. Thus, workpieces of different geometrical dimensions and different material properties, in particular with different material hardnesses, can be processed using the band saw according to the invention without having to undertake significant changes.

Abstract: A positioned sensing device measures and/or calculates the lateral position and movement of a saw blade. These measured and calculated values are used to automatically alter the work-feed rate and/or saw blade rim speed either up or down as sawing conditions change within the work piece or between different work pieces.

Abstract: A rotatable saw unit for optimized log breakdown includes a saw unit immediately downstream of an infeed conveyor and cooperating with the infeed conveyor for sawing a workpiece as the workpiece is translated by the infeed conveyor into the saw unit. The saw unit includes at least one saw aligned for sawing of the workpiece parallel to a longitudinal infeed axis. An optimizing processor determines an optimized sawing orientation relative to the longitudinal infeed axis. A saw unit positioner'selectively rotates the saw unit about a saw unit rotation axis so as to rotate the at least one saw into the optimized sawing orientation prior to sawing of the workpiece.

Abstract: A method and arrangement for adjusting a feed rate of a crosscut saw (1), in particular, in a harvesting head of a forest machine during the crosscutting of wood (9) in the apparatus. A feed force (F) of the crosscut saw and/or a rotating rate (vchain) of a cutter chain (5) revolving around a guide bar (4) are thus controlled. The control is implemented such that first the feed rate (vfeed) of the crosscut saw (1) is measured at given intervals. By adjusting thereafter the feed force of the actuator (2) controlling the crosscut saw and/or the rotating rate (vchain) of the cutter chain (5) and by determining the effect of the performed adjustment on the feed rate of the crosscut saw any change (&dgr;v) in the feed rate and the most advantageous adjustment measure to be performed next is concluded.

Abstract: A positioned sensing device measures and/or calculates the lateral position and movement of a saw blade. These measured and calculated values are used to automatically alter the work-feed rate and/or saw blade rim speed either up or down as sawing conditions change within the work piece or between different work pieces.

Abstract: A vertically movable foam sponge cutting apparatus includes a vertical cutting device disposed on a blade strip frame. The vertical cutting device can be moved left and right in a vertical state. In addition, the vertical cutting device includes an ascending/descending device which is controllably movable up and down to change the rigidity of the blade strip in a cutting operation area. A foam sponge is cut along vertical cutting lines on a working bench. Therefore, a greater cutting function is achieved and the power consumption is lowered.

Abstract: A positioned sensing device measures and/or calculates the lateral position and movement of a saw blade. These measured and calculated values are used to automatically alter the work-feed rate and/or saw blade rim speed either up or down as sawing conditions change within the work piece or between different work pieces.

Abstract: A positioned sensing device measures and/or calculates the lateral position and movement of a saw blade. These measured and calculated values are used to automatically alter the work-feed rate and/or saw blade rim speed either up or down as sawing conditions change within the work piece or between different work pieces.

Abstract: A horizontal band saw device for cutting lengthwise along boards passed therethrough enables increased cutting capacity of such boards and includes a head with both a first board conveyor passing therethrough and a second board conveyor passing therethrough. The head includes an inlet end, an outlet end, a board receiving passage, and a movable band saw blade, the board receiving passage having the movable band saw blade passing from a first side to a second side thereof. The first board conveyor extends through the board receiving passage of the head and beneath the band saw blade. The second board conveyor extends through the board receiving passage of the head and beneath the band saw blade, the second board conveyor being spaced from the first board conveyor.

Abstract: An improved monitoring system for a band saw has at least one position sensor, a controller, and a computer including a data storage device and a display monitor linked to the controller. The system may be used with new and existing models of band saws to provide real-time data relating to feed rate and band speed during the time the saw blade is in cutting engagement with a workpiece. A machine operator utilizes the data to optimize the operation of the band saw as it proceeds through a series of cutting operations.

Abstract: A foam sponge cutting machine with vertical blade strap, including a blade strap rack, a machine body and a blade rotating set. The blade rotating set is disposed on the guide rails of the upper and lower transverse beams of the blade strap rack, whereby the blade strap clamped by the blade rotating set can be kept vertical and moved left and right. The machine body is disposed with a working bench for linearly back and forth moving a work piece placed thereon. By means of numeral controlling method, the positions of the work piece and the blade strap on a plane can be adjusted so as to cut the foam sponge by various irregular or curved lines.

Abstract: Saw mill apparatus and method are disclosed which provide improved cutting of logs. The saw mill apparatus supports and advances a log towards the saw mill's saw assembly and cuts the log longitudinally by a pair of parallel band saws. Blade guides are mounted to the blades of each of the band saws and are movable along the blades toward and away from the log being cut. The diameter of the log is sensed at plural longitudinal positions thereof and the blade guides are displaced along the band saw blades in response to each of the sensed diameters so that the blade guides are continuously positioned in close proximity to the log while it is being cut.

Abstract: An improved method of automatic sawing employs a programmable automatic saw and a remotely located computer which provides additional control for the saw or a group of saws. The saw is equipped with a programmable controller that is capable of storing a series of jobs. The programmable controller allows an operator to run one saw job while contemporaneously programming another saw job. A third person, such an engineer or supervisor, may be programming an additional job or ranges of jobs for the saw while the operator is running and programming other jobs. The improved system provides control for a group of saws thereby assisting in the distribution of work flow, enabling efficient use of materials and improving inventory controls.

Abstract: A pivoting carriage and saw which is characterized in a preferred embodiment by a carriage capable of receiving curved logs and pivotally mounted on a linear-operated trolley for engaging the logs with a pivoting band saw and cutting a selected non-linear path through the curved logs. In a most preferred embodiment the band saw is pivotally mounted adjacent to the trolley carriage and log and a computerized control system is coupled to fluid-operated cylinders mounted on log-adjusting knees on the carriage and on other fluid-operated cylinders provided on the carriage itself and on the band saw and used to select and control desired cutting paths through the logs.

Abstract: A band saw having a controller responsive to sensing signals as to operating parameters of the saw to generate a material distribution profile during a first cut of a piece of bar stock is disclosed. During subsequent cuts, the controller for the band saw operates control circuits for blade cutting force, blade feed rate and blade speed to maintain a desired, usually constant, material cutting rate of the bar stock, notwithstanding changes in bar stock cross section and changes in band saw geometry during the cut. A method is disclosed in which operating parameters are sensed, a distribution profile generated, and the profile employed during subsequent cuts to control the operating parameters for optimum cutting efficiency.

Abstract: The present invention relates to a band saw machine having the capability to produce finished piece parts by employing a rotatable collet and an index vise to rotate and longitudinally position the piece part, a band saw blade positioned in a blade twist assembly capable of making straight, angular, and arcuate cuts on the work piece, and a motor means to move the saw blade perpendicular to the work piece, all under the direction of a pre-programmed computer control.

Abstract: The present invention relates to a band saw machine having the capability to produce finished piece parts by employing a rotatable collet and an index vise to rotate and longitudinally position the piece part, a band saw blade positioned in a blade twist assembly capable of making straight, angular, and arcuate cuts on the work piece, and a motor means to move the saw blade perpendicular to the work piece, all under the direction of a pre-programmed computer control.

Abstract: A mechanical hand for processing edges of a curved plate is attached to the hand supporting member of a robot arm and in use is moved along the edges of the curved plate, which is made of glass, ceramics, metal or the like. The mechanical hand has a fixed bracket fixed to the hand supporting member; a movable bracket supported by the fixed bracket so as to be capable of tilting around a point of processing which is determined to be on the axial line of the robot arm and which corresponds to part of the edges of the curved plate; a processing tool mounted on the movable bracket to face the part of the edges of the curved plate at the point of processing; and a driving means for causing the movable bracket to tilt so that the posture of the processing tool coincides with a surface of the edges to be processed of the curved plate at the point of processing.

Abstract: Band saw apparatus is disclosed which includes cutting enhancement apparatus formed for tilting of the cutting stretch of the band saw blade to vary the force per unit area of the cutting edge of the blade on the workpiece. The cutting enhancement apparatus which tilts the blade at both guide assemblies is shown. The saw carriage is movably mounted to the remainder of the saw to be substantially free to rebound or move away from the workpiece during tilting of the blade to avoid digging in or shearing off of the blade teeth and to permit close spacing of the blade guides next to the workpiece. The saw includes a feed control system having both an orifice control circuit and a support force control circuit. A method is disclosed which is comprised of using the support force circuit to vary the rate of cutting during the cut to prevent overloading of the blade and/or stalling of the machine. Sensors feedback signals which adjust the support force circuit to control feeding.

Abstract: A system is disclosed for selecting a band saw blade for a particular product to be cut on a selected band saw. Specifically, a schedule of predetermined parameters for operating most known types of band saws is entered into a microprocessor. The identity of the specific band saw and product to be cut it also entered. The microprocessor provides recommendations as to the optimum band saw blade for cutting the product. An additional feature of the invention is a system for providing a cost per-piece analysis of the product being cut, using both the present blade and the recommended blade. Further, a library of band saw problems and their recommend solution is provided. Finally, a product cross-reference schedule is provided in order to identify appropriate blades for a plurality of band saw brands.

Abstract: A method of automatic sawing employs an automatic sawing machine having an automatic workpiece shuttle, shuttle and stationary vises, an automatic saw blade feed, one or more incremental motion encoders and a programmable microcomputer. The microcomputer is capable of storing a series of sawing jobs. Each job has a number of sawing steps. Each step in turn defines a sawed workpiece length and (in an embodiment employing a saw blade tilting mechanism) a sawing angle, both of which parameters may be different from those of other steps. The microcomputer receives signals from the motion encoders to determine shuttle and (in a tilt embodiment) tilt position and uses these positions to control shuttle, (in the tilt embodiment) tilt, and vise operation. The microcomputer also corrects each workpiece length with a saw kerf and pivot point correction factor, both modified for sawing angle.

Abstract: Band saw apparatus is disclosed which includes a drive assembly formed for support and guided movement of a saw blade for cutting of a workpiece, an endless band saw blade mounted to the drive assembly, and reciprocation apparatus formed for reciprocation of the blade toward and away away from the workpiece to enable see-sawing of the blade and variation of the force per unit area of the cutting edge of the blade on the workpiece while maintaining the same total force on the blade. To enhance toward and efficiency of cutting the blade drive assembly is mounted to the remainder of the saw to be substantially free to rebound or move away from the workpiece during reciprocation to avoid digging in or shearing off of the blade teeth and to permit close spacing of the blade guides next to the workpiece. The saw includes a control circuit for controlling the rate of movement of the saw arm away from and toward the workpiece to enable timing of saw arm rebound to blade displacement.

Abstract: A crooked cut detecting system consisting fundamentally of a sensor for sensing irregularities developed on a cut end of a material from which a section was cut away by a sawing machine, an arithmetic means for deriving as a developed crookedness the difference between the maximum and minimum values of the above irregularities, and a comparator to compare the developed crookedness with a standard value defining a maximum allowable crookedness. The operations of the above fundamental constituents are computerized so as to be incorporated in the operation of an ordinary automatic sawing machine, whereby successive irregular cutting operations of an automatic sawing machine can be eliminated.

Abstract: A stone saw comprises a revolving sawing rope, a backing roller supporting the revolving sawing rope at each end of a sawing portion on one side of the sawing rope axis against cutting pressure exerted upon the sawing rope, the cutting pressure causing radial wear on the backing rollers, a feed drive for feeding the sawing rope in a revolving direction over the backing rollers, and housings supporting the backing rollers and pivotally adjustable about the sawing rope axis in dependence on the revolving direction of the sawing rope, the backing rollers being mounted in the housings transversely adjustably to the axes thereof and to the sawing rope axis. A clearance sensor is associated with, and radially spaced from, the backing roller for detecting the clearance between the sensor and the backing roller, the distance varying with the radial wear of the backing roller, the clearance sensor emitting a control signal corresponding to the detected clearance.

Abstract: An automatic routing device for sheets made of plastic material utilized especially in compound panes has a cutting head with a band having a sharp edge in the form of a band saw blade. The cutting head is mounted to a structure allowing the cutting head to move along three orthogonal cartesian axes and to rotate along two orthogonal rotation axes. An electronic and numeric command and control device is provided to control the head.

Abstract: Apparatus and methods for producing uniform pieces of meat or other product when cut or sawn from a non-uniform thickness lump. A band saw or the like is adjustable in position to produce different depths of cut piece under the control of signals produced by a control unit. The control employs a keypad for entering numerically the target weight for the cut pieces and an assumed density value for the product. A display unit displays the numerical values entered. A weighing device checks the weight of each cut piece (or batch multiple cut pieces) to produce the actual weight (or average weight) of the cut piece(s) and the control unit compares the actual or average value with the expected value of weight and adjusts the density value if required. The area of the end face of the product is measured by sampling the height of the end face of the product as it passes a sensor.

Abstract: A band saw machine which comprises a generally elongated frame structure including an endless band saw trained between and adapted to travel over a pair of spaced guide wheels and having cutting and return reaches therebetween, a positioning mechanism for fixedly supporting a stock to be cut, and a rocking mechanism including a pair of spaced reciprocating drives for rocking the endless band saw through a predetermined angle in the opposite directions generally about the stock to be cut, with the opposite ends of the frame structure alternately upwardly and downwardly shifted. The frame structure is supported for movement relative to the positioning mechanism between inoperative and cutting positions in a direction generally perpendicular to the stock. The rocking mechanism is operable at least during the cutting operation performed by the cutting reach of the endless band saw.

Abstract: Band saw apparatus are disclosed which include a drive assembly formed for support and guided movement of a saw blade for cutting of a workpiece, an endless band saw mounted to the drive assembly, and reciprocation apparatus formed for reciprocation of the blade toward and away from the workpiece to enable variation of the force per unit area of the cutting edge of the blade on the workpiece. In the preferred form blade reciprocation is provided by a pair of spaced apart guide assemblies each including independently operable fluid piston-cylinder assemblies coupled to a lever carrying guide blocks which engage the back edge of the saw blade. The guide blocks can be reciprocated by the fluid piston-cylinder assemblies in synchronism or out-of-phase to vary the amplitude, frequency and duration of displacement independently of blade speed and at two locations along a length of the blade so as to produce oscillation as well as simple reciprocation.

Abstract: The present invention relates generally to bandsaw machines having a flexible bandsaw blade trained around a plurality of wheels to perform cutting operations and, more particularly, pertains to a method and apparatus for controlling the feeding of the bandsaw blade into a workpiece such that the bandsaw blade is fed intermittently into the workpiece so as to prevent the blade from deflecting off the workpiece and causing work hardening of the workpiece. An alternative embodiment of the invention provides feeding the workpiece into the bandsaw blade in an intermittent fashion.

Abstract: Method and machine for cutting by automatic band saw wherein the workpiece is machined in such a manner that the machining tracks of the workpiece describe circular arcs and the cutting edge of the band saw contacts only part of the workpiece to prevent generation of loadings between the teeth of the saw. The oscillating body in which the band saw is housed is held capably of performing oscillating and tilting motions in the left and right and upward-and-downward motions and the band saw descends, performing oscillating and tilting motions, or the latter performs alternately the oscillating and tilting motions with the descending motions repeatedly, to cut the workpiece. Either a crank mechanism or a hydraulic cylinder is used for driving the oscillating and tilting motions, and a hydraulic cylinder and a cam mechanism are used for driving the upward and downward motions.

Abstract: A metal-sawing machine includes a rocking system whereby the saw blade is enabled to rock in a cutting plane in which the work is cut, wherein the rocking motion is controlled so as to conform to the cutting stroke, which is determined in accordance with the shape and size of the work. The machine ensures that the rocking motion of the saw blade fully participates in cutting the work unlike the known metal-sawing machines in which the rocking motion is partially wasted in cutting "air".

Abstract: An apparatus for detecting lateral deviations of a bandsaw blade has a follower which is in contact with and follows lateral movement of the blade. A sensing circuit, which is connected to the follower, generates deviation signals representing movement of the follower. A control circuit which is responsive to the deviation signals stops the bandsaw when the lateral movement of the blade has deviated beyond established limits.

Abstract: Apparatus for duplicating on the end of a piece of molding, the surface contour of said molding, comprising adjustable holding means for a piece of molding, a band saw for cutting said molding piece transversely, means for holding a sample of said molding oriented substantially 90.degree. from said piece, tracing means operatively connected to said saw for tracing the surface contour of said sample, and means for moving said tracing means and said saw together in sawing through said piece of molding.