Abstract: A band saw machine is adapted for cutting a lumber, and includes frame body unit, a transport unit, a hold-down unit, a cutting unit and a drive unit. The transport unit includes an endless conveyor belt extending in a front-rear direction through the frame body unit for transporting the lumber. The hold-down unit includes an endless hold-down belt extending in the front-rear direction through the frame body unit. The endless conveyor belt and the endless hold-down belt are driven by the drive unit to rotate synchronously to carry the lumber to be cut by the cutting unit.

Abstract: A construction site status monitoring device is provided including processing circuitry configured to receive sensor data from a sensor associated with a construction device including a working element, determine a presence of a density gradient in a working material based on the sensor data, and cause an automatic response relative to operation of he working element based on the determination of the presence of the density gradient.

Abstract: A horizontal band-saw has a base, a conveyor assembly, multiple band-saw assemblies and multiple auxiliary pressing assemblies. The base has multiple crossbars and multiple stanchions. The conveyor assembly is mounted on the base and has two parallel conveyor belts and a guide panel. The band-saw assemblies are mounted on the base across the conveyor belts and each band-saw assembly has a casing, a drive device, two drive wheels and a band saw. Each casing is mounted on a top of the base and has an adjusting device. Each drive device is mounted on a corresponding casing. The drive wheels are mounted in a corresponding casing. The band saw is mounted around the drive wheels. The auxiliary pressing assemblies are mounted on the base adjacent respectively to the band-saw assemblies and each auxiliary pressing assembly has a front auxiliary assembly and a rear auxiliary assembly.

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: In a cutting-off method, when a workpiece is to be cut off by use of an endless band saw blade suspended between a driving wheel and a driven wheel, the workpiece is cut off by imparting to the driving wheel a forced oscillation so that a phase of an oscillation of the driving wheel along its rotational direction is substantially inverted with respect to a phase of an oscillation of the driven wheel along its rotational direction. In addition, pulses can be applied to a driving motor for rotationally driving the driving wheel in order to cause the driving wheel to oscillate along its rotational direction.

Abstract: A bread slicer that has a knife frame, a damper and a variable rate control. The knife frame is movable between first and second positions. The damper is coupled to the knife frame and is configured to affect the rate of movement of the knife frame. The variable rate control assembly has an actuator coupled with the damper to selectively affect the rate of movement of the knife frame.

Abstract: An automatic carton slitting machines includes a transmission means for moving cartons, a sensing and positioning means for detecting and positioning the cartons at locations desired, a slitting means for slitting the carton and a control unit for coordinate and control the operations of all other means. The cutter means includes two spaced cutter sets each has a motor driven rotating saw cutter with adjustable slitting angle. One of the cutter sets is movable by a cutter set moving means for changing spacing distance between the cutter sets to process carton of different width. The cutter means also has a frame lifting means to adjust cutter sets height for processing cartons of different height. Through coordinating the transmission means, cutter set moving means and frame lifting means may coordinate their motion so that the cutter sets may move in three dimensions against the carton for automatically cleaving cartons of different size.

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: A band-saw for sawing metal parts such as bars has a work unit which is capable of displacement in the vertical direction above the workpiece support table. The work unit has two distinct lateral portions located on each side of two vertical guide sleeves and serving as supports for a vertical driving wheel and a vertical guide wheel of the saw-blades, the work run of which is placed horizontally above the location of the workpiece. Two vertical columns forming part of the moving unit are slidably mounted within the two vertical sleeves, the lower ends of which are fixed on the horizontal table. The ends of the vertical columns are rigidly fixed to two horizontal cross-members which are located respectively at the top and at the bottom and which connect together the two lateral portions of the moving work unit so as to form a closed frame.

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: A band-sawing machine is provided opposite to the intended workpiece location with a movable work unit comprising the saw-band and its drive mechanism. The rate of travel of said movable work unit is reduced by a hydraulic circuit provided with a device for regulating the rate of flow. In addition, the hydraulic circuit includes a valve which is capable of limiting or even of interrupting the flow of fluid. The operation of the valve is controlled by a means responsive to an increase in the resistance set up in opposition to the driving tension of the saw-band. The arrangement is such that an increase in said resistance produces a limitation of the flow rate within the hydraulic braking circuit and consequently a reduction in the rate of travel of the movable work unit.

Abstract: Mechanism for controlling the rate of travel of a saw as the saw operates and travels upon a radial arm. A housing contains fluid and an axially movable piston and piston rod. A wheel is operably joined to the piston rod and is connected to the piston rod so that the piston rod moves axially as the wheel rotates. A cable is wound upon the wheel and extends from the wheel and is connected to the saw. As the saw is moved upon the radial arm the cable rotates the wheel, and the wheel forces axial movement of the piston rod and the piston. Movement of the piston forces movement of fluid within the housing. The pressure of the fluid controls the rate of axial movement of the piston and the piston rod and controls the rate of rotary movement of the wheel. Thus, the rate of travel of the cable and the rate of travel of the saw are controlled by the rate at which the piston travels as the piston moves fluid within the housing.

Abstract: A horizontal bandsaw has a main vise positioned slightly to the rear of the cutting location for gripping the workpiece during cutting, a material feed vise positioned to the rear of the main vise for feeding material into the cutting location, and a front vise positioned to the front of the cutting location. The front vise can move to a position to the rear of the cutting location to retrieve a small remnant of uncut material. The three vises each have a movable and a fixed jaw. A lower limit guide is provided on the main vise movable jaw which adjusts the descent of the cutting tool to the width of the workpiece. The fixed jaws are provided with means located within the operating area of the jaws for a slight advance or retraction of the contact face, to firmly grip the workpiece or to retract the contact face so as to prevent frictional contact with the workpiece. The movable jaws have a hydraulic cylinder built into a sliding tube for providing reciprocating motion.

Abstract: A method and apparatus for controlling the cutting of bandsaw machines includes continuous feeding of the bandsaw blade relative to the workpiece by alternating the speed at which the bandsaw blade is fed relative to the workpiece between fast and slow, so that the bandsaw blade is continuously periodically fed relative to the workpiece alternately fast and slow. In a first embodiment, the bandsaw blade is fed into the workpiece and a continuously operating control motor is used to control a flow valve to alternate the speed at which the bandsaw blade is fed into the workpiece. In a second embodiment, the workpiece is fed into the bandsaw blade and a continuously operating control motor is used to control a flow control valve to alternate the speed at which the workpiece is fed into the bandsaw blade.

Abstract: A cutting machine has a plurality of switches, each switch corresponding to a predetermined cutting speed for each of one of the various groups of materials to be cut, the materials having different machinablility qualities. One of a plurality of constant voltage output means are connected with one of each of the plurality of switches for changing the speed of the cutting tool responsive to the constant voltage output means.

Abstract: A band saw and an assembly having an interchangeable casing bearing the saw blade, the saw comprising a leading wheel and at least one led wheel on which the blade is mounted; one of the wheels can be moved by tensioning means between a blade-tensioning position and an action-taking position in which the assembly comprising the casing and the blade can be interchanged.

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: A method for controlling the feeding of a band saw blade in a horizontal band saw machine so that the band saw blade is fed at a uniform optimum cutting rate. A control system is provided for controlling the feeding speed and the driving speed of the band saw blade in such a manner that the ratio of the feeding speed to the driving speed is kept constant during a cutting operation and the ratio of cutting resistance to driving speed is maintained constant to provide a constant cutting power.

Abstract: A metal cutting band saw equipped with blade twisting guides and pivotal, scissors-like mounting which enables the saw to be used as a cut-off or mitering tool, is configured to provide for maximum depth of cut by locating the blade guide mounting bar in a position which does not restrict clearance distance to less than the separation distance between the blade runs.

Abstract: A method and apparatus for controlling the feeding of a bandsaw blade in a horizontal bandsaw machine so that the bandsaw blade operates at a uniform optimum cutting rate. The cutting rate of the bandsaw blade is maintained constant by controlling the feeding speed of the blade into material being cut as a function of (1) the cross-sectional cut length at a time interval and (2) the feeding position of the bandsaw blade into the material.

Abstract: A horizontal bandsaw machine provided with a detecting means for detecting the cross-sectional length of the workpiece being cut during a cutting operation and an actuating means which is controlled by the detecting means to move either or each of the guide means for guiding the bandsaw blade toward and away from the other.

Abstract: A method and apparatus for controlling the feeding of a band saw blade involves detecting the wear of the blade or changes in cutting resistance as a result of such wear during a cutting operation and controlling the feeding of the band saw blade in accordance with the detected wear or cutting resistance resulting from such wear.

Abstract: A method and apparatus for controlling the feeding of a bandsaw blade in a horizontal bandsaw machine so that the bandsaw blade is fed at a uniform optimum cutting rate. A control system is provided for controlling the feeding speed and the driven speed of the bandsaw blade in such a manner that the ratio of the feeding speed to the driven speed is kept constant during a cutting operation.

Abstract: A band saw machine is provided with a cutting head that carries the endless saw blade. The cutting head can be swung from a vertical cutting plane into a horizontal cutting plane. Limits can be made in the feeding stroke of the cut and the return travel. A workpiece feeding and clamping vice is rotated about a horizontal axis. The combined positioning capability of the band saw blade and the workpiece vice allows difficult compound angular cuts to be made in the workpiece. The endless run of the blade is angled upwardly and outwardly away from the workpiece to provide additional clearance for cutting deep workpieces. Powered feed rolls advance the workpiece against a gauging stop to determine a predetermined length to be cut. The vice is then closed to hold the workpiece during cutting. Supplemental supports hold the rearward end of the workpiece during feeding and cutting. Blade guides are spaced for accomodating both small and large width blades.

Abstract: A feed control for a horizontal bandsaw machine has a hydraulic motor assembly which includes a piston dividing a hydraulic cylinder into upper and lower chambers. The cylinder is pivotally secured to the base of the machine, and the piston is pivotally secured to the saw head of the machine by an elongated piston rod. Hydraulic fluid is simultaneously introduced into one end of the motor assembly and withdrawn from the other end to positively regulate the position of the piston within the cylinder. A first pressure control device regulates the hydraulic pressure in the upper chamber of the motor assembly, and a second pressure control device regulates the hydraulic pressure in the lower chamber of the motor assembly. By regulating the pressure differential between the upper and the lower chambers, the rate of movement of the piston, and thus of the saw head, can be precisely regulated and thus optimized to insure cutting accuracy and minimize wear on the saw blade.

Abstract: A portable sawmill includes a log supporting mechanism for holding a substantially horizontal log. A chain saw with a substantially horizontal effective cutting edge at least as long as the log is supported at only one end by a saw mounting assembly with the cutting edge generally parallel to the axis of the log. The saw mounting assembly is adapted for lateral movement relative to the log, as well as upward and downward movement, so that the saw can be positioned beneath a portion of the log and moved upwardly through the log to cut wood slabs. The saw is pivoted to the saw mounting assembly so that the angle between the effective cutting edge and the axis of the log can be adjusted to produce elongated wood fibers during cutting. A pivoting mechanism is provided for rotating the log between cuts so that slabs tapered from one side to the other can be cut.

Abstract: A hydraulic system for controlling the cutting feed speed of a saw frame of a sawing machine, such as a band-sawing machine, includes an improved control valve on the discharge line enabling the fluid to draw off from the hydraulic cylinder, the control valve being capable of amplifying changes of pressure in the cylinder occurring in response to changes of cutting resistance to the saw blade, thereby securing a proper control over the cutting feed speed of the saw frame irrespective of the size and weight of the saw frame.

Abstract: In a horizontal bandsaw machine of the type having a base with a worktable for supporting a material, and a cutting head assembly carrying a cutting blade which is operable at varying speeds and which is arranged to perform a cutting operation on the material, the cutting head assembly being movable in one direction away from the material by a fluid-actuated mechanism fed by a pump from a fluid reservoir, and being movable in the opposite direction by means of gravity when feeding the cutting blade into the material, a control system for controlling the movement of the cutting head assembly in the aforesaid opposite direction, comprising a plurality of control valves and associated conduits for returning hydraulic fluid from the fluid actuated mechanism to the reservoir during movement of the cutting assembly in its opposite direction, the control valves being responsive in part to changes in the operating speed of the cutting blade.

Abstract: A method of controlling the cutting feed speed of a saw frame of a band-sawing machine or a similar machine, whereby the change of cutting resistance to the saw blade is detected as a change in pressure of an oil pressure cylinder supporting the saw frame and by transforming such change into a voltage change by means of a piezoelectric element, the flow rate of a flow control valve provided in the pressure oil discharge circuit of the oil pressure cylinder is controlled by said detected voltage or the like and thereby the cutting feed speed is changed in response to the change of cutting resistance so as to maintain the cutting resistance to the saw frame at an optimum.

Abstract: A method of controlling the cutting feed speed of a saw frame of a band-sawing machine or a similar machine, whereby the change of cutting resistance to the saw blade is detected by sensing the change of load on the back of the saw blade or the change of pressure of an oil pressure cylinder supporting the saw frame and by transforming such change into a voltage change or amperage change by means of a piezo-electric element, the flow rate of a flow control valve provided at the pressure oil discharge circuit of the oil pressure cylinder being controlled by said detected voltage or the like and thereby the cutting feed speed being changed in response to the change of cutting resistance so as to maintain the cutting resistance to the saw frame at an optimum value.