Abstract: An indexing device for successively positioning a tool element relative to an apparatus adapted to perform a series of operational tasks on said tool element comprises a base, a reciprocally movable support mounted on the base, a fixing member adjustably mounted on the support for fixing the tool element thereto, a pivotable arm mounted to the base and extending between the support and the apparatus, an indexing abutment mounted on the arm and positioned thereon to contact a part of the tool element. The support is moved in a first direction to bring the tool element in a task performing position with the apparatus. The movable support has a pusher to contact the arm and to cause pivotal movement of the arm when the support is moved in this first direction whereby the arm and the abutment are moved away from the task performing position. Thereafter, the arm is returned to a subsequent task performing position when the support is moved in a second direction opposite the first direction.

Abstract: The portable band saw sharpener includes a frame for receiving a saw blade that is to be sharpened. A hand-operated motor is pivotally mounted to the frame for driving a grinding wheel, which engages the teeth of the saw blade. A hand-operated structure releasably holds the saw blade in place during the sharpening of the saw teeth, and the motor is guided along a path matching the contour of the saw blade teeth by a cam and an interchangeable cam track, which may be adjusted for saws of various contours and dimensions. The portable band saw sharpener is adjustable, hand-operated and portable.

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 band saw profiling machine includes an indexing mechanism having a feed finger mechanically linked to a caliper finger for reciprocating movement therewith. The caliper finger is urged toward the feed finger during an indexing movement of the indexing mechanism to measure the spacing between adjacent teeth of a band saw blade on-the-fly and concurrently with advancement and sharpening of the saw blade. The tooth spacing measurement is then used in the band saw sharpening machine to provide feedback for a subsequent indexing movement of the indexing mechanism, to accurately position the band saw blade for sharpening of a row of teeth. A control unit of the sharpening machine accepts input of shape factors from an operator that define the pattern of motion of the indexing mechanism, the grinding wheel, or both, for sharpening of irregular tooth shapes.

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: 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: 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 saw blade sharpening apparatus for sharpening an elongated blade having a plurality of aligned cutting teeth. The apparatus includes a grinder mechanism to sharpen the teeth. The grinder includes a body and a rotating grindstone, the grindstone having an axis aligned with the blade. The rotating grindstone continuously circulates in a rotational pattern to move the grindstone across the surface of one of the teeth to grind the entire surface of the tooth. At the same time, the rotating grindstone advances the blade linearly from the tooth being ground to the next tooth in succession.

Abstract: A sharpening apparatus (10) is disclosed. The apparatus (10) has a pivot arm (18) for pivotal movement about shaft (21) extending transversely of the apparatus.

Abstract: An arrangement in automatic saw chain grinders of the kind which includes a mechanism (30, 47) for feeding the cutter links (36) of a saw chain (22) to be ground to a predetermined grinding location on a chain support (14), and also a movable grinding machine (18, 19) for grinding the cutting edge (53) of a cutter link (36) present in the grinding location. The grinding location is defined by a chain feed and/or stop finger (46) against which the rear edge (40) of the cutter link (36) abuts in the grinding location. The feed mechanism (30, 47) includes a rotating or indexing saw-chain drive which is driven by an electric motor (32).

Abstract: A grinding machine for sharpening toothed saws includes a saw blade holder for rotatably holding a saw. A pneumatic or hydraulic ram drives a cam back and forth in one of a number of preselected grooves in a rotatable cam plate for driving a pawl in an arcuate path for rotating the saw blade. Each saw tooth is thus advanced, one tooth at a time, through a grinding position in which a rotating grindstone sharpens the face or top of the saw tooth. The position of the grinder head arm is adjustable through an arc of about 105.degree. to permit top and face grinding without turning over the grindstone or the spindle arm on which the grindstone is mounted. The head arm is tiltably mounted on a heavy plate and releasably secured to the periphery of the plate for stability.

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 chain of a chain saw whose teeth are to be sharpened is mounted in a track (4) of a support table so that it can be indexed to a central cutting station whereupon a ram (12) will be acuated to reduce the width of the track (4) and grip the chain. A cutting device will then be lowered into contact with a tooth on the chain so as to sharpen that tooth. When the ram (12) is moved to the open condition the chain is indexed forward again by rotating a pusher arm (8) about a pin (9) while the pin carried on its own arm is driven in a forward direction. This causes an angled forked plate (10) to engage behind a tooth facing in one direction only (of the two possible directions). As the pusher (8) is moved back again a pin (29) rides up over a latch (30) onto the top face of the cam (31) so that the plate (10) can ride over the top of subsequent teeth carried by the chain.

Abstract: A saw blade supported on a slip-on arbor has a pitch which is greater than the maximum possible stroke of the feeding means. For this reason each individual tooth of the saw blade is pushed in two successive forward strokes, first into an intermediate position by a secondary pawl and then into a working position by a principal pawl. During the advance caused by the secondary pawl the latter is supported at a stop which is formed at a drag lever. The drag lever is pivotable about the slip-on arbor and comprises a guide engaged by a pin. The stop thus moves back and forth on a circular arc about the slip-on arbor causing the secondary pawl to engage a certain location of the tooth face of a tooth it is advancing.

Abstract: A controllable linear drive means (32) is pivotable about a first pivot axis (B) in parallel with the axis (A) of a saw blade (10). A pawl carrier (22) which carries a feed pawl (26) is reciprocable by the linear drive means (32) in circumferential direction of the saw blade (10). The pawl carrier (22) is supported by a guide rod (46) which is pivotable about a second pivot axis (D) parallel to the first pivot axis (B) and is of adjustable effective length. A guide body (18) which comprises a radial guide means (20) with respect to the first pivot axis (B) is pivotable together with the linear drive means (32) associated with the guide body, about the first pivot axis (B). The pawl carrier (22) is guided along the radial guide means (20). The feed pawl (26) is fixed rigidly at the pawl carrier (22). The guide rod (46) is a member pivoted at the guide body (18) and forming part of a second controllable linear drive means (42). The apparatus is suitable for saw blades (10) of very different sizes.

Abstract: An attachment is provided for allowing a chain saw sharpener to be used for filing the depth gauge portions of the cutting links on the saw chain. The sharpener is of the type comprising a sharpener body in the form of an inverted U-shaped channel-defining member adapted to be placed over the bar of a chain saw, and a rotary burr with an abradant end portion which is receivable in a selected one of two horizontal guide bores provided in the sharpener body. The depth gauge attachment comprises an elongated gauge bar and means for removably affixing the gauge bar within the upper portion of the sharpener body channel so that the gauge bar occupies only a portion of the channel length.

Abstract: The invention relates to apparatus for machining circular saw blades and more particularly to the transport means for conveying workpieces to the machining stations of the apparatus. In accordance with the invention, the storage capability of the apparatus is accomplished by subdividing the conveying means into a work path leading through the machining stations; a return path leading through a feeding and discharging station; two branch paths wherein an endless conveyor is arranged only along the work path and associated with the branch paths there are shifting means capable of shifting a work piece carriage from the branch path to the return path; and that on the return path, work piece carriages are maintained at smaller distances than those of the endless conveyor whereby the storage capacity of the apparatus is increased. The apparatus is also adjustable to feed a plurality of different saw diameters for machining.

Abstract: Saw-advancing apparatus in a grinder for circular saws which includes a pad brought into engagement with the edge of the saw by extension of a fluid-operated ram. The pad and ram are swung as a unit to produce rotation of a saw engaged by the pad.

Abstract: A method and apparatus for automatically facing saws is described in which a saw blade is held over a spindle by a pair of electromagnets. A pawl engages successive gullets between saw blade teeth in order to index the saw blade. A grinding head mounted on a carrier then moves into engagement with the indexed saw blade until the carrier reaches a limit. Separate hydraulic actuators are used for the pawl and the grinding head carrier so that a sequence of operation can be maintained. The apparatus is adjustable and a counter is provided to automate the sequencing operation. By indexing the saw blade with the pawl, using the electromagnets to hold the saw blade and automatically sequencing the operation, saw blades with irregular tooth patterns and strobe saws having deep-cut rakers extending toward the center of the blade can be automatically faced. A sequence programmer, responsive to a plurality of sensors, controls sequencing of operations of the pawl and grinding head.

Abstract: Apparatus for converting a manually operated machine for grinding saw blades into automatic operation; including a first hydraulic cylinder for connection to the grinding wheel carriage assembly for reciprocation thereof, a second hydraulic cylinder for connection to a saw blade for incremental rotation thereof, and an electromechanical control circuit for sequencing the operation of the cylinders to automatically position and grind each of a plurality of teeth on a saw blade.

Abstract: A machine for sharpening circular saw blades includes a pneumatically operated indexing mechanism, with the indexing mechanism being responsive to the position of a grinding mechanism which moves perpendicular to the plane of the saw blade to engage the cutting surface of a tooth.

Abstract: A band saw teeth working machine comprises a framework having mounted thereon: a device for clamping a band saw by the side surfaces thereof, having abutments for the apices of the teeth of the band saw and for the back edge thereof, a mechanism for advancing the band saw stepwise in accordance with its pitch and a tool for working the teeth of the saw. The machine includes an auxiliary device for clamping the band saw by the side surfaces thereof, mounted on the stepwise-advancing mechanism, arranged in front of the band saw clamping device in the direction of the advance of the band saw being worked upon, adjacent to this last-mentioned device. The provision of this auxiliary device enables to operate the same machine for setting and notching the teeth of the band saw.

Abstract: According to this invention, two band saw grinder units are constructed in paired relationship, spaced apart, and arranged to receive two band saw bands suspended from overhead supports which will permit the bands to move up and down for the grinding operation instead of horizontal as in the prior art. The grinder units are controlled and powered from a central mechanism located in the area between the units, while the bands are supported in an area outward from the area occupied by the central control mechanism, avoiding conflicting occupancy of the various parts. Novel construction and improved means for adjusting the linkage required for accurate grinding of one or two blades at a time are outstanding features of the invention.

Abstract: A feed device for machines which act on saw teeth, to sharpen the teeth, position the teeth, add hard metal plates to the teeth or the like, which accommodate wide pitch distances between saw teeth and variations in pitch distances between the teeth of the saw. The feed device includes a first reciprocal feed pawl which advances the saw a preset distance on each stroke and a second reciprocal feed pawl which additionally advances the saw to accommodate wide pitch distances between saw teeth and variations in saw tooth pitch patterns.

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.