Abstract: A desk and spaced panels at the edge of the desk forming a half-wall are combined to make the space within the wall available for the storage of wires and equipment associated with devices in use on or adjacent the desk. The half-wall extends above the desk top, and has a slot traversed by the wires leading out to the devices. Brackets that also traverse the slot can be used to support the devices well above the desk surface. The inner panels forming the half-wall are adapted to support shelves under the desk. The brackets also can be mounted in a desk wherein the spaced panels at the surface of the desk, with the slot being formed in a horizontal surface in the desk. The brackets have adjustable support feet and can have cylindrical accessory supports.

Abstract: This invention describes a computer workstation which places the monitor below and behind the keyboard. The shelf for holding the monitor is rotatable independently of movement of a shelf for holding the keyboard. A plurality of shelves are also provided for additional equipment and supplies. In one embodiment, the workstation has separate paper supply and used paper holding shelves. In another embodiment, these shelves are combined.

Abstract: A high-accuracy traveling table apparatus comprises a workpiece fixing device and a laser mirror for position measurement provided on a table capable of traveling at least in the direction of one axis. The table comprises a mount to which the workpiece fixing device and the laser mirror are fixed and at least one partially coupling member for partially coupling the mount to the table so as to prevent transmission of a distortion of the table to the mount.

Abstract: A high-accuracy traveling table apparatus comprises a workpiece fixing device and a laser mirror for position measurement provided on a table capable of travelling at least in the direction of one axis. The table comprises a mount to which the workpiece fixing device and the laser mirror are fixed and at least one partially coupling member for partially coupling the mount to the table so as to prevent transmission of a distortion of the table to the mount.

Abstract: In a movement guiding device, two parallel stationary guides are fixed to a surface plate and plural hydrostatic gas or bearing members are provided for the surface plate and the stationary guides. A Y stage is moved in a Y-axis direction under the influence of these bearing members. Additional hydrostatic gas or air bearing members are provided in relation to the surface plate and the Y stage so as to support an X stage for movement in an X-axis direction orthogonal to the Y-axis direction. Guide of the Y stage in the X-axis direction is made by the stationary guides on the surface plate, while guide thereof in a Z-axis direction perpendicular to an X-Y plane is made by the surface plate. Guide of the X stage in the Y-axis direction is made by the Y stage, while the guide thereof in the Z-axis direction is made by the surface plate, similar to the Y stage. With such structure, any vibration, rolling, or otherwise, of the Y stage is not transmitted to the X stage. Thus, high-precision guide is attainable.

Abstract: An improved drawer assembly which may be secured underneath a desk top or the like, the drawer assembly being capable of supporting a computer keyboard or the like for movement between storage and working locations and which will permit the keyboard to be in various positions of vertical and tilting adjustment, which positions of adjustment will be maintained as the keyboard drawer is moved between storage and working positions.

Abstract: A mechanism for moving a table means lengthwise and crosswise of the table has two mutually orthogonal pairs of table carried parallel guide faces adapted to be mounted on the table, a support base, two pairs of guide members having two mutually orthogonal pairs of parallel guide faces in spaced opposed relation to corresponding pairs of said table carried guide faces, the guide members being movably mounted on the support base for movement in a direction for moving parallel guide faces of the respective pairs in a direction perpendicular to the length of the guide faces, two pairs of parallel straight motion guide bearing mechanisms mounted between opposed pairs of guide faces for lengthwise movably supporting the table on the guide members, and a driving device engaged with at least one guide member of each pair of guide members for moving the one guide member in a direction to move the guide face thereof in the perpendicular direction.

Abstract: An article transfer apparatus includes a power driven shuttle carriage mounted for movement along a first linear path between opposite end limits. An article holder assembly includes a base mounted on the carriage for movement relative to the carriage along a second linear path normal to the first linear path between opposite end limits. The holder base mounts a sleeve slidable along an elongate guide rod whose opposite ends may be independently positioned transversely of the first linear path. The guide rod may thus be located to extend parallel to or to be inclined relative to the first path to accordingly enable the sleeve position the holder on this second linear path or to move the holder base transversely of the carriage driving movement of the carriage along the the first path.

Abstract: The invention relates to a work-station arrangement, in which a number of components can be secured on a longitudinal girder. The longitudinal girder has substantially a rectangular hollow profile, at the corners of which are provided longitudinal grooves, which preferably widen toward the inside of the longitudinal girder. Furthermore, a central carrier pipe is provided, which is constructed integrally with the longitudinal girder through bracings. A fastening groove can be provided at least on one side of the girder, which groove has tooth systems on its walls for threadedly receiving screws. The components have hook-shaped holding elements attached thereto and insertable into the longitudinal grooves for securing the components to the girder.

Abstract: A linear feed mechanism includes a track member, a moving member movably supported on the track member through a linear motion bearing mechanism, and the moving member is moved relative to the track member by a threaded ball screw shaft. There is a smooth elongated semicircular groove in one face of the track member, a corresponding spirally threaded semicircular groove in the moving member and these two semicircular grooves jointly define a substantially circular through hole.

Abstract: A high-accuracy traveling table apparatus comprises a workpiece fixing device and a laser mirror for position measurement provided on a table capable of traveling at least in the direction of one axis. The table comprises a mount to which the workpiece fixing device and the laser mirror are fixed and at least one partially coupling member for partially coupling the mount to the table so as to prevent transmission of a distortion of the table to the mount.

Abstract: An adjustable keyboard support is disclosed constituted by a rear housing that pivotally supports one end of a parallel link mechanism. A front housing is carried by the other end of the parallel link mechanism, and pivotally supports a keyboard mounting plate. The parallel link mechanism permits upward and downward movement of the keyboard mounting plate without change in the tilt of that plate. A gas cylinder mechanism coupled to the front housing changes the vertical position of the same, and a slide plate adjustment mechanism provides forward and backward movement of the keyboard mounting plate.

Abstract: An electronics oriented desk comprising a board fixed to leg portions, a rail disposed relatively slidable over an upper end and a lower edge of the board in a direction parallel to upper and lower edges and being orthogonal to the upper and lower edges and a scanner disposed over a predetermined range on the rail in opposition to the surface of the board, whereby in case the document is laid on the board, and the rail is shifted relatively in a direction crossing the board manually or by motor drive, the document on the board is produced as the electronic data by the scanner.

Abstract: A computer support device includes a housing and a keyboard drawer unit which is slidably supported on the inside of the housing for movement from a stored position to an extended position. The drawer unit contains a forward recessed section of sufficient size to accommodate a computer keyboard. The drawer unit also contains a rearward section which includes a recessed portion for storage as well as a switch assembly portion and a passageway for a keyboard power cord. The switch assembly portion includes a plurality of switches for control of the power supply to a computer and a host of peripheral devices. A power strip which includes devices for protection against electrical disturbances is connected to the drawer unit's switch assembly by a flexible power cord.

Abstract: An adjustable drawer assembly is disclosed comprising first and second arm members (28,30) having inward ends pivotally journaled to a housing member (4), and a carriage plate (20) for transporting the arms from a storage position within the housing to an operable position in front of the housing. Distal ends of the first and second arms include meshing teeth (44,73) for locking the arms together whereby preventing downward pivotal movement of the arms relative to the housing. A third arm member (78) is provided in support of to a keyboard support surface (104). The third arm is pivotally connected to the second arm member, whereby enabling the keyboard support surface to pivot into alternative angular attitudes. Meshing gear racks (42,90) are provided on the second and third arm members for inhibiting pivotal motion, and actuation means (92) is provided for simultaneously releasing the meshing teeth racks whereby enabling coincidental vertical and angular repositionment of the keyboard support surface.

Abstract: A computer input device removably mounted to a keyboard is disclosed. A bar, which may be slightly longer than the width of the keyboard, is slidably mounted beneath the keyboard. The bar is slidable from a first position in which one end of the bar extends beyond the side of the keyboard to a second position in which the other end of the bar extends beyond the other side of the keyboard. An input device, such as a trackball, is removably attached, for example, by hook and loop fasteners, to the end of the bar which extends beyond the side of the keyboard. To move the device to the other side of the keyboard, the device is lifted off the end of the bar, the bar is slid under the keyboard until the other end extends beyond the other side of the keyboard, and the device is attached on the other end of the bar. The removable mount of the present invention thus accommodates left and right side mounting, eases the switching from side to side, and takes up minimum space.

Abstract: A support table for a desk top computer, which is positionable in the front seat of the automobile, adjacent the driver's seat, the apparatus comprising a horizontal support surface, so as to support a computer such as a desk top computer, a frame, supporting the surface; a pair of rear leg members, positionable along the rear wall of the frame, the lower ends of the leg members resting on the "passenger seat" of the automobile, and a pair of front leg members, along the front edge of the frame, the front leg members extending downward to rest on the floor of the automobile, the relative height of the front and rear leg members so as to provide a substantially horizontal support surface for the computer; and further including a slidable tray as a portion of the support surface upon which the computer sets.

Abstract: A keyboard support assembly for a computer work stand is disclosed comprising a subplate (74) having a profiled opening (98, 100) along each side, and a keyboard support plate (78) residing on top of the subplate. A pair of pivotal locking devices (138) are attached to the underside of the keyboard support plate to depend into the subplate profiled openings, and to selectively engage against an underside of the subplate as the keyboard support plate is slideably re-positioned thereon. The locking devices (138) include gear teeth 140 which engage with a gear rack segment 102 along the subplate underside.

Abstract: A supporting apparatus for a semiconductor noncrystal rod comprises a movable ring adapted to move freely in horizontal directions unless it is engaged with the monocrystal rod, a lock means to prevent the movable ring from horizontally moving, and a drive means to elevate the movable ring.

Abstract: This invention relates to an elongated support unit for use in cooperating sets such as matched pairs. The unit has a frame having one or more substantially horizontal stages, one above the other, below its top. Each stage is equipped with a movable platform that can be drawn forward and retracted. The platform is disposed to share a load with at least one corresponding platform of another unit of the set. A set of the units can be adapted particularly well to carrying a CRT, computer, and/or printer across their tops and a keyboard borne on cooperating movable platforms therebelow.

Abstract: A clip-clinching device for a coil-spring unit includes an arch having a pair of laterally spaced upstanding poles and a horizontal bar connecting upper end portions of the poles. First and second carriers are positioned on the horizontal bar and are movable therealong. First and second members are respectively provided on the first and second carriers and are movable in the vertical direction. First and second clip-clinching tools having projecting tongues at which a jaw is defined are respectively mounted to the first and second members. A base member positioned under the horizontal bar supports a movable coil-spring unit transfer device for movement along a line perpendicular to the horizontal bar.

Abstract: A coupling assembly is provided to adjustably mount the table legs to a table top. The coupling assembly includes a pivotally mounted body having a pair of angularly offset recesses which are adapted to cooperate with a spring biased lever in order to securely lock the table leg in either its extended, supporting position or its collapsed storage position. Further, the body is provided with an elongate guideway along which the table leg may be laterally adjusted.

Abstract: In an actuator, a carriage coupled to an item to be displaced with a translatory movement comprises a follower element which defines contact surfaces engaged against the flanks of the thread of a micrometric screw. The contact surfaces co-operate with the thread of the screw only over a small angular portion thereof. The follower element of the carriage is held on the thread of the screw by resilient thrust means acting on the carriage so as to urge it pivotally about an axis (X--X) which is parallel to its direction of translatory movement, being prevented from moving in all the other degrees of freedom. The actuator is especially adapted for use in translator devices in which the level of precision is of the order of a micrometer.

Abstract: A rolling bench for storing plants in greenhouses and other applications. The rolling bench has a platform stop supported on a base for edgewise movement beyond opposite sides of and restrained against tilting relative to the base by means of an improved roller glide system. This improved roller glide system has parallel rollers disposed between and in rolling contact with the base and top and spacers for retaining the rollers in spaced relation, such that during edgewise adjustment of the top, the rollers undergo rolling movement relative to the base and top along the direction line of movement of the top with the rollers retained in proper spaced relation to rollably support the top throughout a full range of movement.

Abstract: A mounting structure is disclosed including two pairs of spaced apart parallel rails with a longitudinal slot separating each of the pair. A trackway is formed under each pair of rails and a slider is slidable in the trackway and may be connected to a third rail orthogonally mounted on the pairs of rails, by means of a bolt passing through the slider and engaging a nut in a T-shaped slot in the third rail.

Abstract: An adjustable pocket printing platen is disclosed for use with the printing platen of a prior art type of silk screen printing machine. The adjustable pocket printing platen includes a frame having a pair of spaced, transverse rails having end flanges positioned to bottomly underly the marginal edges of the machine platen. Thumb screws extend through the bottom flanges to lock the pocket printing platen to the machine platen in any longitudinally adjusted position. A small platen transversely rides along the transverse rails and is sized to receive and support the pocket of a garment thereupon. Set screws extend through marginal edges of the small platen to lock the platen to the transverse rails in any desired transversely adjusted position. The top surface of the small platen extends above the top surface of the machine platen to receive the printing screen when it is lowered to apply a screened design to a garment pocket.

Abstract: A work top is height adjustable and may tilt about a horizontal axis near the front edge. The work top may be mounted on an open office beam system or an office screen or partition in cantilever fashion or it may be a free standing unit. The work top is mounted for horizontal sliding movement and tilting on a horizontally extending undercarriage. The undercarriage includes an inclined strut journalled for sliding movement in a normally fixed inclined strut. A cable reeving system interconnects the work top and fixed inclined strut to maintain the work top in the same horizontal position regardless of its elevation. One or more tension springs, the tension of which may be adjusted, interconnect the under carriage and work top to counterbalance the weight of the work top and what may be positioned thereon such as a computer. A releasable latch locks the work top to the under carriage so that the work top may be locked in its height adjusted position.

Abstract: A housing adapted to be mounted beneath the top of a table and a shelf sized to fit substantially within the housing are operatively connected by a pair of telescoping rails which guide movement of the shelf between a retracted position in which the shelf is substantially within the housing and an extended position in which the shelf has a substantial portion thereof outside the housing. The rails pivot about an axis to change the height of the shelf with respect to the top of the table and the entire assembly includes a mechanism for securing the shelf in the extended position. The housing includes a vertically stepped slot in which a pin secured to the rails is movable to hold the shelf at predetermined heights with respect to the top of the table corresponding to the steps of the vertically stepped slot.

Abstract: A roller-equipped platform movably supported upon a tabletop having a straight, accessible rear edge, the platform including a straight depending flange received in a guide channel defined by the rear edge of the tabletop and a guide track secured to that rear edge. Stop elements at opposite ends of the track limit the extent of sideways movement of the platform upon the tabletop.

Abstract: An anagraphic stand comprises a base frame, a camera support structure and a mobile stage. The stage is driven relative to the camera by octhogonally-mounted linear drive means attached to the base and by a gear-reduced rotary drive means. All of the drive means are electronically converted microstepping devices and the drive structure is specially adapted to provide smooth, vibration-free motion.

Abstract: An extensible table comprises a rigid panel defining the working plane of the table in a condition of minimum extension thereof and at least one structure for extending the panel including a frame connected to the panels so as to be slidable in a direction parallel to the plane of the panel and movable between an extreme retracted position within the panel and an extreme extended position in which the frame projects from one side of the panel.

Abstract: A workstation for computer-aided design comprises an L-shaped main support frame having a monitor support panel which is both tiltable and slidable fore and aft. Connected between the horizontal elements of the L-shaped support frame is a secondary support frame carrying a digitizer support and a keyboard support. The keyboard support is forward and below the level of the digitizer support. The digitizer support is slidable fore and aft on the secondary frame, and the secondary frame itself is slidable fore and aft, and forwardly tiltable, relative to the main support frame. The main support frame rests on nylon feet, which are slidable on a table top. A centrally located foam pad is connected to the main support frame through a swivel mechanism, and is in compression and in frictional engagement with the table top, so that the workstation can be swivelled about a vertical axis, but translational movement is prevented.

Abstract: A table comprises a floor engaging base section including a top structural member having an upwardly facing horizontally disposed surface and a downwardly facing horizontally disposed surface. The structural member is in spaced relation above the supporting floor and has a slot formed therein. A top member has an upwardly facing horizontally disposed supporting surface and a second downwardly facing surface disposed in facing relation to the upwardly facing surface of the top structural member of the base section. Guide means extend downwardly from the top member through the slot formed in the top structural member of the base section for attaching the top member to the base section to permit movement of the top member relative to the base section along the path defined by the slot.

Abstract: In addition to providing fine adjustment for precise two-coordinate positioning of a specimen, a microscope stage has a handle for rapid displacement of the stage when the fine adjustment is disconnected. This handle is secured to the underside of the cross-slide (6) of the stage, and in a laterally central position of the stage; the handle also extends through a cut-out in the stage carrier, thereby defining the range of movement of the stage. The arrangement of the handle is ergonomically favorable and reduces the danger of contamination of the specimen. In addition, a rotatable sleeve on the handle enables fine and precise adjustment of the angular orientation of a chucked specimen, with respect to the microscope.

Abstract: A slide mechanism for use in transporting a stereoscope along a horizontal support arm of a photogrammetric instrument includes a member slidably mounted to a pair of support tracks cantilevered to the support arm. A clamping mechanism is used to lock the slide member in a first predetermined position on the support tracks and is unlockable to enable the slide mechanism to be moved along the support tracks to a second position.

Abstract: A direct-acting table mechanism in which tables are driven without any contact by use of a hydrostatic fluid for thrust-transmitting the tables in their sliding direction. The tables are hydrostatically supported on hydrostatic guides on a bed, and differential pressures are supplied to the hydrostatically supporting portions to control the attitude of the tables. This table mechanism is of high degree of accuracy uninfluenced by errors in the feed screw system, high rigidity and thus permits highly stable fine feed.

Abstract: An optical positioning stage arranged for the precise movement of light optical components composed of a pair of plates having rail receiving grooves, a pair of rails joining the plates and attached thereto by an adhesive, and a mounting table slideably disposed between the rails and the plates. The mechanical configuration of the unit allows multiple combinations to provide movement in all three dimensions.

Abstract: An extendable shelf for a display rack permits the shelf to be pulled out to permit stocking and product rotation and permits it to be used in different sizes. A wire shelf is formed of inhingedly connected sections with their outermost and innermost ends connected to sheet metal side supports. The side supports are also constructed in sections which are telescopically mounted so that the side supports may be pulled out or pushed in causing the sections of the wire shelving to lie flat or hinge up to provide different depths of shelf. An upstanding member contacts product on the shelf to pull the product forward when the shelf is pulled out, thus allowing restocking of fresh product at the rear of the shelf.

Abstract: A mechanism is disclosed for use in supporting a keyboard in a desired adjustable position relative to a CRT unit at a work station. The mechanism is adapted for attachment to the downwardly facing surface of a suitable horizontal support arranged at various levels or distances from a floor; and is characterized as being capable of mounting a keyboard for horizontally directed movements between storage or retracted and use or extended positions and for vertically directed movements into maximum upper and lower use positions in opposite directions from an intermediate or reference position normally assumed by the keyboard when in its storage position, wherein means are provided to automatically move the keyboard from its upper position into its intermediate position incident to movement of the keyboard horizontally towards its storage position.

Abstract: An office furniture desk arrangement for providing a CRT work station, in which the desk includes a desk top that along the front of the desk defines a broad and flat work surfacing that extends between the sides of the desk under which a computer keyboard may be retractably mounted, and that along the back of the desk extends a relatively narrow trackway that also extends essentially between the sides of the desk, the upper surfacing of which is in substantial coplanar relation with the desk work surfacing. Underlying the desk top trackway is an easily excessed horizontal trough for concealing electrical wiring, with the trackway shiftably mounting a carriage for movement therealong that includes a rear casing that is roller equipped for riding along the trackway cantilever mounted fashion, and a front casing that is disposed over the desk top work surfacing and is connected to the rear casing for hand adjustment movement by the desk user toward and away from the desk user at the front of the desk.

Abstract: An electrical discharge machining apparatus having an improved bed which provides improved control over the gap between a machining head and a workpiece by reducing the amount of deformation produced in the bed when the table and saddle are moved. The bed is constituted by an upper plate and side plates, with saddle guide rails being disposed on the upper plate, a saddle movably mounted on the saddle guide rails, table guide rails mounted on the saddle, and a workpiece-supporting table movably mounted on the saddle guide rails. In accordance with one embodiment of the invention, the saddle guide rails are positioned at the edges of the upper plate, directly above the side plates of the bed. In another embodiment, reinforcing members are provided under the upper plate, extending parallel to and directly under respective ones of guide rails.

Abstract: A positioning apparatus for accurately positioning an object such as a work has a guide track secured to the associated frame by a plurality of tightening devices each having a tightening force adjusting member. The guide track is also pressed laterally against a vertical face portion formed on the associated frame by means of a plurality of pressing plates which are affixed to the frame by other tightening devices each having a pressing force adjusting member. Both the tightening devices securely holds the guide track on the frame while allowing relative movement therebetween caused by a difference in the amount of thermal expansion.

Abstract: An extendible merchandise shelving display embodies an elongated, stationary shelf support which extends laterally from and is connected to at least one vertical support. An elongated, movable shelf support extends alongside and is slidably connected to the stationary shelf support. The movable shelf support is adapted for sliding movement relative to the stationary shelf support selectively to an extended position spaced from the vertical support and to a retracted position adjacent the vertical support. Cooperating locking members are carried by the movable and stationary shelf supports in position to engage each other and limit sliding movement of the movable shelf support while in its extended and retracted positions.

Abstract: The disclosed guide device utilizes no rigidly mounted external guide elements. However, a guide element freely slidable on an air cushion on a flat base can be lowered from the interior of a slide element (by removal of the air cushion) onto the base. Once the guide element has been lowered, it is fixed by subpressure onto the base and takes over the function of a rigidly mounted guide. The guide element, which was previously freely slidable on the base, is now exactly positionable along the guide of the guided element. If the displacement path is to be increased, then the slide piece element is fixed by subpressure on the base, the guide element is again acted upon with compressed air and driven within the slide piece in a displacement direction and at the end of the interior space is again fixed to the base. Now the slide piece is again released and can on its air cushion be further positioned exactly in the displacement direction. This stepwise movement is limited only by the size of the base.

Abstract: An extendable shelf for a display rack permits the shelf to be pulled out to permit stocking and product rotation and permits it to be used in different sizes. A wire shelf is formed of hingedly connected sections with their sides connected to telescoping sheet metal side support brackets. The side support brackets are constructed and mounted so that they may be positioned to extend vertically either above or below plane of the wire shelving to selectively form side edges of the shelf. The rearmost section of the shelf when pivoted out of the plane of the shelf and held by a detent may contact product on the shelf to pull the product forward when the shelf is pulled out. This will allow restocking of fresh product at the rearmost section of the shelf when it is again pivoted down to the plane of the shelf.

Abstract: A slide table comprising a table top slidably mounted on a pair of guide rails and having a plurality of recesses in the top surface of the table top to receive dowel pins that serve as a fence. Clamps for holding work pieces may be screwed into tee-nuts that are fixed in the table top. Slide collars are provided on the bottom of the table top, which collars partially encircle the guide rails and allows for lengthwise sliding movement of the table top on the guide rails while severely restricting vertical and lateral movement of the table top relative to the guide rails. The guide rails are attachable to the base of a radial arm power saw, and the ends of the guide rails are supported on adjustable height legs. Work pieces are positioned against the fence pins and tightly clamped to the table top. An operator feeds work to a saw by pushing or pulling on handles that are attached to the table top.

Abstract: A latch and detent mechanism for use with a sliding tray 12 mounted in a cabinet 10 is disclosed. The mechanism includes a stationary detent bar 18 having one or more detent slots 22, a latch bar 20 that is pivotably coupled to the sliding tray with a finger 46 at one end for engaging a detent slot to lock the tray in position and a handle 14 at the other end for disengaging the finger to unlock the tray, and biasing means 54 for urging the finger toward the detent slot.

Abstract: A full length, partially rimmed, interior shelf of a corner base cabinet is so shaped and controlled that it makes a 90.degree. turn as it is drawn out through the cabinet door on a retractable guidance and support system to an extended position where it can be readily loaded or unloaded and returned to its original position.

Abstract: Apparatus is disclosed for automatically sonicating microtiter trays and arrays of test tubes, vials, and other small sample containers. An inverted cuphorn on an ultrasonic transducer introduces sonic energy through an extended fluid bath, on a one-by-one basis, into sample containers partially immersed therein. Stepped or continuous movement sample container positioning is by an x-y positioning table driven by reversible motors under the direction of an electromechanical controller. The dwell time of each sample container in the sonic energy field is selectable.

Abstract: A radiotransparent table for supporting a patient in an X-radiography zone slides in linear bearings on a standard. The table is motor driven through a cable or like linkage anchored at the head and foot of the table and passing over the motor drive roll and an idler roll located on the stand between the drive roll and zone so that substantially the full length of the table can be moved to the radiography zone. The head and foot anchors are unobstructed in movement toward the drive roll. Preferably there are two symmetrical sets of rolls, anchors and linkages at opposite sides of the table applying neutralizing torques to the table.