Abstract: A tubular workpiece notching machine usable for general grinding operations has a worktable (1) whose base plate (10) is pivotally mounted to the frame (6) of the notching machine around a pivotal orthogonal axis (Y—Y) in such a manner that the worktable (1) is movable from a first working position in which the machine vice (2) co-operates with the shaping pulley (3) in recessing ends of tubular workpiece by grinding, to a second working position in which the shaping pulley (3) is used for generally grinding a workpiece. Connecting elements are provided for removably anchoring the base plate (10) of the worktable (1) to the frame (6) in the first working position.

Abstract: An apparatus for sharpening the teeth of a circular saw comprises a rocking arm with a pawl to engage and actuate the teeth of an indexing ratchet wheel which is mounted coaxially with the circular saw for synchronous clockwise indexing, and a grinding wheel capable of intermittently moving forward to contact and grind the saw teeth. A cam mechanism controls the rocking arm so that the land of each saw tooth first contacts the grinding wheel when the grinding wheel moves forward, prior to the contacting of the root and the cutting edge thereof with the grinding wheel when the grinding wheel is about to reach its frontmost position. The saw tooth starts to stop temporarily for a short time when the grinding wheel is about to contact the root and the cutting edge. The problems of damages caused by impacts and/or excessive contact pressure are therefore alleviated.

Abstract: A circular saw sharpener comprising a base mounted on a work table at the top, a bracket pivoted thereto at the top which bracket has a L-shaped frame pivoted thereto at the top for holding a motor and a grinding wheel, a guide arrangement mounted on said bracket at the bottom for guiding the circular saw blade to be sharpened, a feed mechanism mounted on said base and controlled by a hand lever to carry the circular saw blade to be sharpened toward said grinding wheel for grinding. The level position of the circular saw blade to be sharpened can be adjusted by an adjusting knob. The angular position of the sand wheel can be adjusted by a lock screw, to fit the inclination of the teeth on the circular saw blade to be sharpened.

Abstract: To gain access to the cutting edge of a saw tooth in the direction of both the back and the front face of a tooth in a single grinding process, the grinding tools (27,37) are adjustable in relation to both their respective pivoted arms (2,3) and with them relative to the machine frame (11,12). Only the primary pivoted arm (2) is driven up and down by a drive (43), pivoting the secondary arm (3) with it by a drive joint (6). Because the pivot axes of pivoted arms (2,3) are not parallel, a universal coupling (6) must be used. This drive joint (6) is offset relative to the pivot axles (32) upwardly from the saw-blade guide (13) in the plane (14) of the saw-blade. Thereby with an otherwise identical device wide or larger-diameter saw blades can be ground.

Abstract: An automatic dual sidegrinder for a circular saw includes precision adjustments for the tangential grinding angle, the radial grinding angle, and provides a high speed automatic regrinding operation. The tangential angle adjustment is made by a torsion bar that presses against a rotatable index finger stop. The torsion bar is moved by a screw bearing against it mounted in a fixture attached to the frame. The radial angle adjustment is made by turning cams mounted on bolts bored into a frame which are situated in slots cut into movable plates which support rotary grinding spindles. The cams rotate the plates, changing slightly the radial angle of attack of the grinding wheels. The speed of the saw is doubled by indexing the saw on the completion of both a forward and rearward longitudinal stroke of the grinding wheels. The drive motor for the longitudinal motion of the wheels has an output cam shaft with oppositely opposed flats.

Abstract: A machine for grinding the depth gauges of saw chain cutter links includes a saw chain carrier mounted for movement toward and away from a power grinding element. As the carrier moves a cutter link toward the grinding element, the cutter tooth of such link moves beneath indexing structure which includes a shield plate which then moves with the carrier toward the grinding element. Upon continued movement, the shield plate contacts an indexing roller which forces the plate down against the top of the tooth. After the plate bottoms against the tooth, the plate forces the indexing roller upwardly. The roller, being linked to the grinding element, lifts the grinding element to its grinding position for grinding the depth gauge of such link. An alternative embodiment includes a brake activated by the carrier to hold the grinding element in its grinding position after the cutter tooth passes beneath the indexing roller.

Abstract: A grinding machine for grinding the cutters of cutter links. A cam-acting chain positioner is operable to force a cutter link downwardly against a support for the link. To grind a cutter, the chain positioner is actuated to move the cutter and the support for the cutter in a direction causing the edge of a grinding wheel to come against the cutting edge of the cutter. The mechanism is such that the grinding wheel protrudes farther into the gullet of the cutter link with greater movement of the support in a direction producing grinding of the cutter.

Abstract: An upstanding support is provided and a rotary grinding head is journaled from the upper end of the support for rotation about a vertical axis. A horizontally disposed support arm is pivotally mounted from the support at one end portion for swinging about a vertical axis and the other free end portion of the support arm has a grooved support wheel journaled therefrom for rotation about a horizontal axis extending transversely of the support arm. The grooved support wheel may have a saw chain trained thereover and the grooved support wheel, during oscillation of the support arm, is swingable into registry with diametrically opposite side portions of the rotary grinding head. Also, a chain tooth engaging and positioning member is supported from each of the opposite side portions of the support arm adjacent the grooved support wheel and swingable into and out of an operative position.

Abstract: A machine for grinding the depth gauges of saw chain cutter links includes a saw chain carrier mounted for movement toward and away from a power grinding element. As the carrier moves a cutter link toward the grinding element, the cutter tooth of such link moves beneath a shield plate which then moves with the carrier toward the grinding element. Upon continued movement, the shield plate contacts an indexing roller which forces the plate down against the top of the tooth. After the plate bottoms against the tooth, the plate forces the indexing roller upwardly. The roller, being linked to the grinding element, lifts the grinding element to its grinding position for grinding the depth gauge of such link.

Abstract: Grinding apparatus which includes a clamp for holding an article to be ground. The clamp is swung, in orbital fashion, to move the clamp from a position located under a lower edge portion of a grinding wheel located on one side of the wheel's rotation axis, to a position located under a lower edge portion of the grinding wheel located on the opposite side of the wheel's rotation axis. In the sharpening of saw chain, the clamp is used in holding chain during the sharpening of cutter links of one hand when occupying one position, and is used in holding chain during the sharpening of cutter links of opposite hand when occupying its outer position.

Abstract: A saw chain grinding machine has a disc-shaped grinding wheel mounted for rotation in a fixed position on the base of a grinding machine. A saw chain holder is mounted at one end of a support arm extending across and beneath the wheel, with the opposite end of the support arm being mounted on the base for swinging movement about a pivot axis parallel to the axis of rotation of the grinding wheel. Swinging movement of the support arm causes a corresponding swinging movement of the saw chain holder along the periphery of the wheel. A stop fixed to the machine base limits swinging movement of the support arm in one direction to determine a grinding position for the saw chain holder along the periphery of the wheel. The support arm is adjustable lengthwise for moving the holder and thus a saw chain cutter element toward and away from the wheel in a line extending generally toward the axis of rotation of the wheel when the arm is in grinding position against its stop.

Abstract: Apparatus for grinding depth gauges in a saw chain. The chain is composed of plural cutter links, each having a depth gauge and a cutter blade. The apparatus includes a stationary grinding wheel and a platform on which a selected cutter link is mounted, for shifting therewith toward and away from the wheel. A guide member mounted adjacent the wheel is positioned to contact the cutter blade of the selected link, to limit the closest approach between the wheel and the associated depth gauge. The latter is ground thereby to a selected depth relative to the associated cutter blade. Also disclosed is mechanism for positioning each of a succession of such links at a preselected position on the platform.

Abstract: A mount is provided and includes structure for supporting a saw chain with a tooth thereof in predetermined position relative to the mount. A support is also provided and a rotary grinding wheel is journaled from the support. Parallelogram linkage structure operatively connects the support end of the mount for relative swinging thereof to bring the periphery of the grinding wheel, and said tooth, into engagement with each other along a path of relative movement extending substantially radially of the wheel and with the axis of rotation of the wheel spaced to one side of a plane in which the tooth is disposed.

Abstract: A support plate is provided and includes a pair of intersecting adjacent side marginal edges disposed at generally 100.degree. to 120.degree. relative to each other and provided with endwise outwardly opening grooves formed therein communicated with each other at adjacent ends. The plate includes a transverse bore formed therethrough whereby the plate may be oscillatably supported from a swingable arm of a saw chain sharpener for movement of the plate toward and away from the rotary grinding wheel of the sharpener. Adjustment structure is supported from the plate for adjustably limiting angular displacement of the plate in one direction relative to the corresponding swing arm. The grooves formed in the plate are provided to guidingly and slidingly receive the guide lugs of an associated saw chain and the plate includes adjustable abutment structure engageable with successive saw chain teeth to limit shifting of an associated saw chain relative to the plate along the grooves.

Abstract: A support is provided from which a drivable rotary grinding wheel is journaled for rotation about a first predetermined axis. A mount is also provided and is supported from the support from guided back and forth shifting relative thereto toward and away from the outer periphery of the grinding wheel along a predetermined path extending at least generally radially of the axis of rotation of the grinding wheel. The support means also supports the mount for limited oscillation of the mount about a second axis generally paralleling the first mentioned axis and the mount includes structure operative to support a length of saw chain therefrom.

Abstract: A first mounting structure is provided and supported atop a support standard. The mounting structure has a motor driven rotary grinding wheel journaled therefrom and a second structure defining a support arm has one end thereof oscillatably supported from the mounting structure for swinging movement of the other end of the support arm about an axis generally paralleling but spaced from the axis of rotation of the grinding wheel. The other end of the support arm includes a mount for supporting a chain saw chain therefrom with a selected tooth of the chain in predetermined indexed position and the support arm is swingable into and out of positions with the selected indexed tooth properly engaged with the periphery of the grinding wheel for sharpening the tooth.

Abstract: A grinding machine for sharpening circular saw blade teeth. The machine includes an arbor for supporting a circular saw blade at a pre-selected position relative to a grinding disc. The grinding disc is mounted to a parallelogram linkage that has a tracing pin fixed thereto. Movement of the tracing pin over the surface of a sawtooth-shaped template causes corresponding movement of the grinding disc against a selected sawtooth. Also included is a tooth indexing mechanism whereby precise spacing of the circular saw teeth is obtained. This is accomplished by a tooth spacing pattern mounted to the arbor and by an indexing pawl that facilitates rotation of the arbor in precise increments equal to desired spacing for the teeth of the blade being operated on. The arbor is pivotably mounted relative to the grinding disc to enable bevel grinding of the tooth surfaces.