Abstract: A grinding machine (10) for double-sided grinding of tooth flanks, in particular hard-metal tipped circular saw blades (14) is described. The grinding machine comprises two grinding units (16, 18) each with a grinding body, a first drive to move at least one of the two grinding units (16, 18) along a first axis (x1, x2) running perpendicular to a plane containing the saw blade (14) and also a second drive (36) to move at least one of the two grinding units (16, 18) along a second axis (z) running parallel to axes of rotation of the grinding bodies. Furthermore a third drive (38) is provided to move at least one of the two grinding units (16, 18) along a third axis (y) running parallel to the first (x1, x2) and the second (y) axis. A control method according to the invention for the grinding machine (10) provides that a tangential clearance angle of a tooth is varied along a tooth flank during the grinding of the tooth.

Abstract: A saw blade positioning device has two drive mechanisms and two guidance devices, which are preferably oriented at right angles in respect to each other. If a first guidance device is oriented in the radial direction of the circular saw blade by the linear guides, and the other guidance device in the circumferential direction, a desired advancement curve of the engagement member, independently of the saw blade diameter, is achieved respectively by means of the same control, or respectively the same control pulses, and of the drive mechanisms, in every radial position of the first guidance device. A mechanically robust basic structure results in addition, which makes a precise positioning possible.

Abstract: A grinding machine, preferably for sharpening circular saw-blades, has a machine frame that supports a device for supporting the saw blade, for fixedly clamping the blade, and for advancing the saw-blade tooth-by-tooth. The grinding attachment has two independent operating spindles or, which are preferably oriented perpendicular to one another, and support separate drives. The grinding attachment is mounted to pivot and be adjusted in three spatial directions. In a selected pivoting position, one of these spatial directions (Z direction) is oriented radially with respect to the saw blade. In this position, the axis of rotation of one spindle is oriented in the circumferential direction, and the axis of rotation of the other spindle is oriented in the radial direction. A grinding attachment of this type permits the hollow-grinding of tooth faces with grinding pencils that have a small diameter. A separate, high-speed motor serves to drive the grinding pencil.

Abstract: A computer-controlled band saw sharpener employing electrically powered, X and Y axis drivers, each having a reciprocating element. The X-axis driver actuates a feed finger mechanism, to index the saw in repetitive, stepped fashion, while each tooth is successively ground. In concert with the X-axis driver, the Y axis driver repetitively lowers and raises a grinding head, provided with a rotary grinding wheel. Both the X and Y axis drivers include servomotors to rotate the shaft of an elongated ball screw. A carrier box houses a non-rotatable ball screw nut. The nut travels back and forth along the ball screw shaft in accordance with its direction and extent of rotation. Drive arms for the feed finger mechanism and the grinding head mechanism are bolted at their lower ends to a threaded bushing in the nut carrier box. The computerized controller is programmable, to produce virtually any desired tooth shape in the saw.

Abstract: A saw blade sharpening machine includes a receiving and positioning chuck assembly for setting a saw blade in a grinding position in a plane corresponding to a main saw blade plane; and a grinding device which has a first and a second grinding head for grinding opposite tooth flanks of a saw tooth of the saw blade and an arrangement for moving the first and second grinding heads independently from one another towards and away from the saw blade plane in a direction perpendicularly thereto.

Abstract: A pivot body (22) mounted on a machine bed (20) so as to be capable of swinging defines a lift axis (D) which extends transversely of its own pivot axis (A) and along which a reciprocating slide (24) is movable. Infeed of a saddle (26) on the reciprocating slide (24) can be effected along a spindle axis (E) transversely of the lift axis (D). A tool spindle (28) adapted to receive a tool (30) is supported on the saddle (26) so as to be driven in rotation about the spindle axis (E). Furthermore, a workpiece slide (42) is guided for traversing movement on the machine bed (20) and, together with a workpiece support (44), it defines a central plane (G) extending at right angles to the pivot axis (A). An advance finger (58) is adapted to be engaged intermittently with a respective one of the cutting teeth (12) of a workpiece (10) in order to advance the same.

Abstract: The apparatus comprises a saw blade holder (24), a grinding slide (30) which carries a profiled grinding wheel (38) and is movable to and fro in a strokewise manner with respect to the saw blade holder (24), and a feed slide (40) by means of which a saw blade (10) in the saw blade holder (24) can be advanced in a stepwise manner. A dressing template (50) is arranged at the apparatus in a normally inoperative position and can be moved in intervals into an operative position in which the grinding wheel (38) is dressed by plunging into the dressing template (50). The feed slide (40) can be put out of operation during the dressing intervals. The stroke of the grinding slide (30) is adjustable prior to the next plunging motion into the saw blade (10) corresponding to the radius decrease of the grinding wheel (38) effected by dressing. This simplifies the dressing operation of the grinding wheel (38) and shortens the time required for each dressing operation.

Abstract: The apparatus comprises a saw blade holder (24), a grinding slide (30) which carries a profiled grinding wheel (38) and is movable to and fro in a strokewise manner with respect to the saw blade holder (24), and a feed slide (40). At the feed slide (40) a feed finger (48) can be moved from an inoperative position into a driving position in which it engages after a return motion of the feed slide (40) behind a tooth (12) of a saw blade (10) driving same during the next feed motion. The feed finger (48) can be rendered stationary in its inoperative position during dressing intervals. A dressing tool (50) is arranged at the feed slide (40) in such a manner that it can be moved in the dressing intervals from an inoperative position into a dressing position.

Abstract: An indexing system for use in a bandsaw sharpening machine which includes at least one grinding wheel for engaging the teeth of a bandsaw blade. An indexing block slideably disposed with respect to the bandsaw blade end has a pawl for engaging the blade to push it in a forward direction while friction pads inside the block frictionally engage the sides of the bandsaw blade. A wire link reciprocally moves the indexing block with a forward stroke pushing a tooth past an index finger. The index finger drops into the path of the tooth after the forward stroke and a reverse stroke is initiated pulling the block and blade back against the finger so as to hold the blade stationary as the wire link retracts the indexing block. The friction pads allow the block to slide along the blade to its initial position to ready it for the next forward stroke.

Abstract: A sharpener frame is supported relative to a floor and has a front side. A first portion of a band saw is supported at the front side of the frame. A second portion of the band saw is also supported relative to the frame, parallel with the first portion of the band saw, and also at the front side of the frame in one of two locations. Each location is on a different side of the first supported portion of the band saw. A clamp for the band saw tooth being sharpened includes a pair of plates having upper edges generally conforming to the profile of a saw tooth for clamping a substantial portion of the tooth in a fixed position relative to the frame during sharpening. The plates are released after sharpening for positioning a different tooth between the plates. A coolant supply system moves a liquid coolant through channels in the plates that have outlets adjacent to the tooth edge for cooling the tooth during sharpening.

Abstract: A device for grinding saw blades, both hand saws and circular saws so that a predetermined tooth profile is obtained, utilizes a grinding head that moves in one plane and moves the saw in a second plane. The device comprises a saw blade mount, an indexing system for indexing a saw tooth to move in a first plane, a grinding head to grind a saw tooth, a grinding head travel arrangement to move the grinding head in a second plane, the second plane being at an angle of about 35.degree. from the perpendicular of the first plane, and a control system for controlling movement of the saw blade in the first plane and the grinding head in the second plane to ensure a predetermined saw tooth profile is ground.

Abstract: A disc-shaped rotatable grinding wheel has association with a saw chain holder such that in the support of a chain thereon oppositely facing cutter elements can be ground at the same point on the grinding wheel. The saw chain holder has a pivotal mounting for positioning the saw chain at the same point on the wheel for the oppositely facing cutter elements. Various adjustments are included in the structure for positioning the chain in place and for limiting the position of grinding structure.

Abstract: A gimbal-like device having an arbor for holding a circular saw blade mounted on an angled arm which is attached to a carrier plate which is pivotable about one axis and rotatable about another axis with the carrier mounted on a turntable for swinging the fixture about a third axis whereby the saw blade can be located at various angular positions for grinding or sharpening the teeth of the blade by a planar grinder such as a surface on a vertical grinding or sharpening wheel.

Abstract: A saw blade (10) is supported on a saw blade carriage (14) adapted to be adjusted by an adjusting drive means (18) along a carriage guide means (16) and cooperating with a distance measuring means (26,28,30). A sensor means (34) is disposed in the path of movement of the saw blade (10) and emits signals in response to the position of a front edge portion of the saw blade (10) extending transversely of the carriage guide means (16). The adjusting drive means (18) is controlled by these signals and stopped at a predetermined nominal position of the front edge portion of the saw blade (10). In this manner the saw blade (10) positioning is effected automatically and the positioning accomplished permits a conclusion to be drawn with respect to the diameter of the saw blade (10) so that no separate measurement thereof is required.

Abstract: A saw grinding device which provides a blade securing rotatable platform which mounts on a horizontal surface such as a table disposed beneath an overhead armature saw device wherein the platform is provided with an edge gauge and peripheral stop device.

Abstract: An apparatus for profile-forming saw teeth, a carriage to which a saw blade to be toothed is affixed for feeding longitudinally and transversely with respect to a cutter blade. The carriage is horizontally rotatable about a cutting position of a cutter blade as a center of rotation and a tooth angle changing mechanism gradually moves the carriage to a predetermined angle at feed positions according to the timing of the longitudinal and transverse feed mechanism, thereby shaping saw teeth.

Abstract: An apparatus for forming a saw blade or saw band by forming saw teeth in a solid stock moving continuously in a longitudinal direction includes a grinding wheel mounted for rotation about an axis which is inclined at an acute angle to and which diverges from the direction of movement of the stock. The grinding wheel has a generally frusto-conical configuration and an outer periphery defined by first and second axially distinct helical grinding ribs having different contours.

Abstract: An automatic saw chain grinder includes a saw chain support mounted for reciprocative movement on a support carriage. A spring urges the carriage in one direction to move a cutter tooth of a supported saw chain into a grinding wheel against the residual pressure of fluid in a first single-acting hydraulic cylinder. Pressurization of the cylinder moves the carriage in the opposite direction away from the grinding wheel. The grinding wheel is spring-biased toward an active, grinding position and moved away from such position by a second single-acting hydraulic cylinder. The first and second cylinders are sized and the respective springs of the carriage and grinder selected such that upon pressurization of the common hydraulic circuit for such cylinders, the carriage retracts the cutter tooth away from the grinding wheel before the grinding wheel retracts from the grinding position.

Abstract: A holder for a circular saw blade to permit sharpening of the blade on a sharpener. The holder comprises a bed to receive the saw blade. The blade can be positioned on the bed. There is a slot in the bed and a table. A further slot is formed in the table. A bolt or the like extends through the slots to releasably attach the table and the bed to allow pivoting of the bed relative to the table. The angle of presentation of the blade on the holder to the sharpener is controlled. The holder is simple to operate and easily adjusted.

Abstract: Apparatus for automatically profile-forming saw teeth wherein the apparatus includes a carriage on which a saw blade to be toothed is securely fixed and an intermittent longitudinal drive is adjustable to set a distance between one saw tooth and an adjacent saw tooth of a template or saw blade used as a pattern which is attached to the carriage. An input shaft of a clutch/brake mechanism is provided to operate a longitudinal feed mechanism by pendular motion whereby longitudinal advancement of the carriage is achieved. Upon determining the desired longitudinal feed, the carriage is stopped and fed transversely toward a cutter by means of a transverse feed cam to cut new saw teeth or to recut teeth on an existing saw blade.

Abstract: A wheelhead in a grinding machine for sharpening the teeth of band saws is disclosed. The base of the wheelhead has horizontal guideways, whereon a support carrying a grinding wheel is mounted, and a flat portion inclined at 45.degree. to the horizontal and serving as a guide for displacement of a dressing tool holder movably mounted on the support (9) on the side thereof opposite to the saw-teeth sharpening area. In addition, the wheelhead is provided with a device for holding the saw in the process of grinding off its weld. This device is mounted on the dressing tool holder in the operating area of the dressing tool. A saw-teeth sharpener furnished with the wheelhead being claimed provides for both sharpening the teeth of a band saw and grinding off its weld.

Abstract: Apparatus employing a reciprocating feed of a band saw to an abrasive wheel and a pitch feed of the saw to the abrasive wheel. The saw is positioned so that during a part of the pitch feed the portion of the tooth back edge adjacent to the tooth tip comes into contact with one shaped surface of a supporting element, whereby the saw is retarded and at the same time this portion of the tooth edge is strengthened and planished. During the remaining part of the pitch feed, the portion of the tooth front edge adjacent to the tooth tip makes contact with the other shaped surface of the supporting element, whereby this portion of the tooth front edge is strengthened and planished. In the machine, as viewed in the direction of the pitch feed, two shaped surfaces are disposed in relation to each other so as to form a wedge.

Abstract: Machine for treating saw blades, in particular for sharpening teeth of circular saw blades, comprising a bearing unit for centrally mounting a circular saw blade of any diametrical dimension, a feed device for stepwise turning the saw blade by a tooth-pitch or multiple thereof, and a treating device for sharpening the teeth of a saw blade arranged to work in timed relationship with the device. The feed device and treating device being arranged diametrically opposite from each other with respect to the bearing unit. The feed device and bearing unit being arranged on common guide members for selective displacement in a ratio of 2:1 along a line extending diametrically to the saw blade to be treated to accommodate different size blades.