Abstract: The permanent magnet is mounted within the coil in engagement with the magnetic frame so when the coil is energized by a pulse of DC voltage of polarity giving a coil flux aiding the magnet the plunger is actuated against the bias of the spring to move the plunger close enough to the magnet to be retained. A pluse of opposite polarity gives a coil flux opposing the magnet flux so the holding force is less than the spring force and the plunger is moved to its inactive position.

Abstract: An electrically driven portable surface treating machine such as a sander, polisher, buffer, and the like, having an oscillatable platen driven from a motor shaft and which creates dust during use, is provided with a dust collection fan on the motor shaft in a fan housing portion of the tool housing and an exhaust outlet or port which can selectively be fitted with dust collection means, such as a filter bag. The oscillatable platen is enclosed within a shroud or skirt and the interior of the shroud or skirt is ducted to the inlet of the dust collection fan housing portion. Between the shroud and the fan, there is provided a selective shutter arrangement which may be selectively opened and closed by the machine operator to enable the machine to be operated in either a "dustless" or a "non-dustless" configuration or mode of operation.

Abstract: A variable pull-off mechanism for a sewing machine is provided with a thread pull-off disc on a rotatably mounted shaft which is concentric with the drive shaft of a vertical axis looptaker. The disc is formed with thread catching edges which engage and pull-off thread from a bobbin as the disc is oscillated between a fixed and a controllable position in accordance with the operation of a servomotor responsive to various control signals.

Abstract: An interlock mechanism for a sewing machine cabinet of the drop head type that prevents the inadvertent unlatching of the sewing machine support platform prior to pivoting hinged panels out of the way thereby preventing damage to the sewing machine and panels.

Abstract: A furniture construction is disclosed in which a self-supporting framework of identical and interchangeable frame members engages and maintains interchangeable exterior prefinished panel pieces, shelves, and drawer guides by means of identical and interchangeable fastening means which engage only the frame members and thus do not mar or deform the panel pieces, shelves, drawers, or the like.

Abstract: A novel chain stitch sewing mechanism is disclosed in which thread loops which are retained for enchainment with thread loops introduced by subsequent needle penetration are released only in response to the action of the thread seized and manipulated during said subsequent needle penetration. A chain stitch conversion device for a conventional lock stitch sewing machine operating on this principle is disclosed. Also disclosed is a novel combination of a chain stitch forming mechanism with a sewing machine skip stitch mechanism.

Abstract: An electronically controlled multiple pattern sewing machine is provided with the capability of sewing a repetitive sequence of patterns. The sewing machine operator selects, one by one, the patterns desired to be sewn and these are stored in a temporary memory in the order of their selection. In addition, each of the patterns may be modified such as by providing double feed, bight mirror, feed mirror, bight override and/or feed override. The arrangement also allows the operator to replace a previously selected pattern in a string with a different pattern at the same place in the string.

Abstract: An electronically controlled multiple pattern sewing machine is provided with an arrangement which senses when the buttonhole paddle and buttonhole presser foot are not properly positioned at the time a buttonhole pattern is selected to be sewn. Under these circumstances, an alarm is activated and stitches are not formed even though the operator may attempt to sew.

Abstract: An electronically controlled sewing machine sews the mirror image of a pattern in the feeding direction by using for the first needle penetration the bight data of the first stitch of the pattern and feeds using the feed data of the last stitch of the pattern. Then the second needle penetration uses the bight data of the last stitch of the pattern, followed by feeding using the feed data of the next to last stitch of the pattern. This continues until the pattern is completed with the feed data of the first stitch.

Abstract: A thread tensioning device for a sewing machine is provided with a rigid beam which pivots on an adjustable fulcrum in engagement with a mounting plate. The device includes an adjustable tension selector movable along the plate and beam for varying the tension on needle thread disposed between the plate and beam.

Abstract: A monogram sewing system comprising a monogram sewing machine capable of needle feeding as well as underbed feed dog feeding of the work piece, an articulated presser foot, and a work holding frame for constraining feeding motion of the work piece to translatory motion.

Abstract: A zig zag sewing machine, wherein a needle bar having a basting position beyond its zig zagging range, is provided with a presser foot having therein an elongate opening which is defined to permit one needle of a twin needle device to pass therethrough without striking the foot upon descent of the needle bar of the machine from a basting position, and which has a beveled edge to interfere at one end of the opening with the other needle and deflect such other needle so that it can pass through the opening.

Abstract: A table support of die-cast and machined generally wedge-shaped configuration is suspended from the machine base by four screws and positioned by four leveling screws adjacent the suspension screws. The table support provides two parallel, spaced apart flat, inclined ramps or ways along which the in-feed table is moved by a height adjustment screw. The in-feed table is also of die-cast and machined generally wedge-shaped configuration and is held to the table support by a pair of extension coil springs having looped ends that are inserted into holes provided in the table and table support castings, respectively, so that the assembly is of generally rectangular block shape of variable height. In assembly, the springs are assembled in a relatively unstressed position and the table and table support moved relative one another by pushing the table up the ramps or ways on the table support to stretch and tension the springs to tighten the table and table support together.