Abstract: An auxiliary blade tensioning device for a scroll saw 10 permits quick selective adjustment of the tension of the blade 20. A scroll saw 10 utilizing the blade tensioning device of the invention preferably includes a pair of arms 14 and 16 mounted on a frame 12 for cooperative support of a saw blade 20 and reciprocation by a power assembly 18. The uppermost, articulated arm 14 is coupled with a camming mechanism 22 for quick, selective tensioning of a replacement saw blade 20.

Abstract: A scroll saw has a base including integral walls forming a gear casing, a frame assembly mounted on the base, and lower and upper oscillating arm members pivotally mounted on the frame assembly. The gear casing houses gear and counterweight assemblies for driving and counterbalancing the oscillating motion of the lower and upper arm members. A saw blade is removably mounted between corresponding free ends of the lower and upper reciprocating arm members. The ends of the saw blade are prepositioned between a pair of blade holders, and the entire assembly of blade and blade holders is then attached as a unit to the free ends of the arm members. Blade tension is adjusted by means of a tensioning system that indexes blade tension to rotation of a tension knob. The saw further includes a nonflexible tube which functions as a combination airblaster and blade guard for directing an air stream into a cutting area to remove sawdust and other debris while preventing accidental contact with the saw blade.

Abstract: The invention pertains to a saw, in particular to a jig saw or scroll saw, with a saw blade which is driven by a force acting on a parallelogram of rods. A saw blade is attached to a connecting shank which joins two longitudinal side arms. The two longitudinal side arms are designed to move in their longitudinal direction. On at least one of the two longitudinal side arms a guide element in the form of, for example, a turning roller, is positively guided against a stationary guide surface which is at an angle, preferablye an acute angle, to the connecting shank. As a result of this positive guidance, the backward movement of the saw blade from the cut edge during the return stroke is reduced to a desired value. Thus a jig saw of small size, but with a large stroke, can be realized in which the saw blade is guided parallel to the cut edge at all times but is moved back by a small amount from the cut edge during the return stroke.

Abstract: A method and apparatus for cutting a workpiece, such as a panel, in particular a sandwich panel, in which an elongate milling cutter 21 is mounted in axially spaced bearings 18, 19. A workpiece is supported on a support 11 and a relative cutting sweep movement between the supported workpiece and the elongate cutter is caused to take place in at least one direction transverse to the axis of the cutter, whereby the cut is made in that transverse direction.

Abstract: An improved scroll saw blade holder includes a one-piece body having a base and a pair of arms which extend transversely from the base and define an open area therebetween. A slot is provided in the base extending entirely through the base into the open area and extending only partially through the base in a direction generally perpendicular to a plane of the body so that the body remains integral in the base at the slot. A clip is provided on the body and includes a positioning plate which is received in the slot. The positioning plate is located adjoining a set screw in a threaded bore extending from the slot to one side of the body. A portion of a scroll saw blade is received and clamped in the slot between the positioning plate and a side of the slot opposite the threaded bore with the set screw. Scroll saw blades with or without mounting pins may be accommodated.

Abstract: The machine tool comprises a frame (1, 2, 3) with two fixing elements (22 and 39) for fastening a scroll saw blade. The fixing element (22) is driven by an electrical motor (5) in a vertical reciprocating movement. The two fixing elements (22 and 39) are linked to each other by a metallic ribbon (45) passing on pulleys (46 to 50). The position of the pulley (47) can be changed by means of a cam (53) acting on an arm (52) so as to stretch the ribbon (45) to the desired value.

Abstract: A scroll saw blade holding system comprises at least an upper scroll saw arm with a notched, forked end, a pair of plate members held together by a screw for clamping an end of a scroll saw blade, and a pivot pin, extending through the plate members and shaped to rest within the notch in the scroll saw arm. The pin preferably includes a longitudinally-extending, knife edge pivot point which allows the plate members and blade to pivot relative to the scroll saw arm. Also in a preferred embodiment, a blade retaining assembly is included and comprises a bracket attached to the saw arm and a lock knob and bolt positioned above the plate members for retaining the pin within the notch.

Abstract: A vertical gang saw produces an ovoidal sawing curve when the frame has at each corner attached feet that are engaged in slide bars which themselves are attached by an extremity to the body of the machine. The lower and upper slide bars undergo a synchronized swing movement that is transmitted by small drive rods. The lower drive rods are driven by an eccentric gear moved vertically. The upper drive rods are driven by an oscillating pinion with a double cam.

Abstract: The drive mechanism for the oscillating tool has a transmission device comprising a band, rope or the like oscillating longitudinally under tension. This transmission device is driven by a connecting rod driven by an eccentric pin which is drivable with an electric motor. To reduce manufacturing expenses and lengthen service life as well as provide a higher operating performance, the connecting rod is pivotally connected to rocker member, with whose free end the transmission device, e.g. a band, extending transverse to it, is connected. To accomplish this the free end of the rocker member is provided with a clamping device for the transmission device and a coupling bolt on which an eye of the connecting rod is engaged.

Abstract: The improved saw blade suspension device permits adjustment at an angle between (1) 0.degree.-90.degree.; (2) 90.degree.-180.degree.; and (3) 180.degree.-270.degree.. This constitutes a substantial improvement because it permits adjustment according to different directions of the saw blade, and according to each operator who may be left-handed or right-handed. Two clamping sheets are used and only one pin is required for each clamping sheet. The device comprises an upper body and a lower body (1), the upper and lower body having a pair of ears (12), the upper and lower body having at one end a portion (13), holes (14, 15, 16 and 17) located in the front, right side, left side and the rear, a steel pin (11) inserted in the ears (12) through apertures (121, 122). The saw blade (3) is inserted in the holes (14, 17) or holes (15 and 16) and is locked by screws (19), into two holes (18) each of which is located at one end of the body (1).

Abstract: The present invention is related to a stepless transmission scroll sawing machine with saw blade fastening and micro-inch adjusting device and the related positioning device and, more particularly to a scroll sawing machine which includes a carbon brush motor controlled by means of a control circuit to drive an eccentric plate to carry the saw blade control arms to make an up-and-down reciprocating motion so as to perform sawing process, wherein a saw blade fastening and micro-inch adjusting device is set to fasten up the saw blade and to adjust the tension of the saw blade according to the material to be processed, and wherein a positioning device is mounted on the upper arm to press on the material to be processed to facilitate the performing of sawing process and to prevent the saw blade from breaking.

Abstract: A blade positioner for a scroll saw is disclosed which permits adjustment of the saw blade relative to the pivoting beams or arms of the scroll saw so that the plane movement of the blade is coincident with the blade direction, particularly in the event that the ends of the arms are somewhat misaligned with respect to the plane of travel of the arms due to inaccuracies of the arm pivot bearing locations. Also disclosed is an anti-rattle spring interposed between the work table and work table support so as to minimize rattle of the work table relative to the support in all directions.

Abstract: A scroll saw blade clamp and blade alignment tool to facilitate blade changes while assuring proper positioning and alignment of the blade. The blade clamp is for the upper end of the blade and includes a pair of clamp bars, one of which is pivoted to the upper saw arm. A locking screw clamps the bars together for clamping of the blade, and a strategically located pin prevents relative rotation of the clamp bars and also serves as a blade guide to properly locate the blade while it is being clamped in place. The alignment device takes the form of a flat bar provided with a recess for holding the lower blade clamp. A groove in the bar is centered on the recess to properly align a saw blade received in the groove.

Abstract: A novel mounting assembly for use with a universal woodworking tool support system is the subject of the invention. First and second straight elongated support stanchions are received by tubular members of the universal tool support system. A scroll saw is mounted on top of these two straight stanchions. A drive train includes an eccentric drive for reciprocating the scroll saw arms and a concentric mass between the eccentric drive and the output of the prime mover is part of the universal tool support system. The concentric mass together with the straight support stanchions greatly reduces the vibrations which are transmitted through the drive train to the scroll saw framework.

Abstract: The present invention relates to a saw blade holder for precision saws. Precision saws are designed to hold a saw blade between two parallel arms. Upper and lower blade holders mount the saw blade on the arms. The present invention relates to the lower blade holder and comprises two clamping elements which are designed to threadably engage and fit inside of a slotted tubular member. The blade passes through the slot in the tubular member and is clamped between the two clamping elements. The tubular member is comprised of a finely divided metal which has been shaped into the desired configuration utilizing a lubricant which is embedded throughout the thickness of the tubular sleeve. This lubricant is released over the lifetime of the tubular member so as to continually lubricate the wear points thus reducing wear and the adverse effects associated therewith.

Abstract: A hydraulic gang saw frame is provided with an elastic sealing sheet covering the entire top side of hydraulic cylinder and piston units for stretching saw blades. The pistons pass through openings in center portion of the sealing sheet and are firmly connected through latter. The preferred portion of the sheet covers at least three lateral sides of the frame. The elastic deformation of the sheet is such as to permit full strokes of the pistons.

Abstract: A precision woodworking saw having a variable speed drive mechanism which drives a saw blade carried on a reciprocating C arm. An electric motor has a drive shaft carrying a split drive pulley which drives a split driven pulley through a V-belt. The driven pulley is mounted on a driven shaft which reciprocates the C arm through an eccentric drive arm. The pulley sections of the split pulleys are movable toward and away from one another to vary the pitch of each pulley and its effective diameter. An adjustment knob can be turned to adjust both pulleys simultaneously to vary the speed ratio between the driven shaft and drive shaft as desired to control the speed at which the saw blade is driven.

Abstract: A precision saw is the subject of the present invention. A framework mounts a planar member and presents a work surface having an opening for receiving a saw blade. A C-member is coupled with the framework and has upper and lower arms extending parallel to and above and below the work surface. The planar member is mounted for pivotal movement by a pivot rod positioned at a point in a horizontal plane located substantially at the center of the bight of the member. A saw blade extends between the upper and lower arms for cutting a work piece and a drive system is provided for moving the C-member in a generally vertical plane about the single pivot point.

Abstract: A hacksaw machine comprises an upper and a lower horizontal bracket, a swinging arm in each one of the brackets and a driving mechanism for pivoting the lower swinging arm. A saw-blade connects the front ends of the swinging arms. The lower swinging arm is twice as long as the upper arm. Both swinging arm are tensioned in opposite directions by springs respectively which are adjustably fastened at the brackets. The swinging mechanism is independent on the lengths of the brackets.

Abstract: To floatingly support a saw blade in a frame, the frame is formed, at its free ends, with forked elements; clamping elements are clamped to the saw. The engagement between the forked element (the blade fitting between the gap in the fork) and the clamping element is by means of a depression-projection fulcrum engagement, so that the clamping element, to which the saw blade is attached, can rock or tilt with respect to the forked element, attached to the frame, thus avoiding holding stresses on the saw blade which lead to breakage of the blade at the attachment or clamping points.