Abstract: A system for transporting a carrier vehicle using linear motors comprising a linear motor housing shaped to hold one or more linear motors includes a rectangular top plate. A left side plate is connected adjacent to a first longitudinal edge of the rectangular top plate and a right side plate is connected adjacent to a second longitudinal edge of the rectangular top plate. The linear motor housing further includes a plurality of coupling components operable to couple the linear motor housing to one or more adjacent linear motor housings in a manner that facilitates continuous propulsion of the carrier vehicle across the rectangular top plate of the linear motor housing and rectangular top plates corresponding to the one or more adjacent linear motor housings.

Abstract: Disclosed is a method of producing a microporous polymer membrane, comprising: providing a polymer material; melting the polymer material; forming a precursor film by cooling and crystallizing the molten polymer material using an air knife; extending the precursor film; annealing the extended precursor film, primary stretching the annealed precursor film; forming a preliminary membrane by subjecting the primary stretched film to secondary stretching at a high temperature, and forming a microporous polymer membrane by heat setting the preliminary membrane. A microporous polymer membrane produced by the method is also provided.

Abstract: In manufacture of a polyimide film, self-supporting film is heated with both ends in a width direction held and carried by the tenter apparatus. The tenter apparatus has a guide member placed on each side of a carry path for the self-supporting film and a pair of tenter chains each moved along the guide member and each including a film holding mechanism for holding an edge portion of the self-supporting film. The tenter chain has a rotating body supported rotatably around a shaft member extending in a direction in parallel with a carry face of the self-supporting film and perpendicular to a longitudinal direction of the guide member for movably supporting the tenter chain. The shaft member is directly or indirectly fixed to a member identical to a member to which the film holding mechanism is fixed.

Abstract: A method is disclosed of directing bias tows of a fabric to be wrapped around a form to create a fabric preform. The fabric includes at least a first set of bias tows that are generally parallel with one another and a second set of bias tows that are generally parallel with one another but that are not parallel with the first set of bias tows. An edge strip is attached to ends of the first set of bias tows at a first lateral edge of the fabric relative to a feed direction of the fabric onto the form. The edge strip is moved to direct the first set of bias tows. The fabric is wrapped around the form by rotating the fabric and form relative to one another about the central axis of the form to create the fabric preform.

Abstract: Disclosed is a fabric for an airbag including a polyester fiber, and particularly to a polyester fabric for an airbag of which toughness is 3.5 to 6.0 kJ/m3 and tearing strength measured according to the ASTM D 2261 TONGUE method is 18 to 30 kgf, wherein the fabric includes polyester fiber of which toughness is 70 to 95 J/m3, a method of preparing the same, and an airbag for a car including the same.

Abstract: A modular tenter frame for guiding a pair of chains with pins through a predetermined path to transport an open width tubular knit web through a drying oven and/or a steaming station to a compressive treating station to improve quality of the open width tubular knit web. The frame includes a rail section. The rail section guides an associated chain with the pins through the predetermined path to transport the open width tubular knit web through the drying oven and/or the steaming station to the compressive treating station to improve the quality of the open width tubular knit web. The rail section has a pair of recessed tracks being longitudinal, facing in a same direction, being spaced-apart from each other by a space therebetween defined by a web, and receiving the chains.

Abstract: A modular tenter frame for guiding a pair of chains with pins through a predetermined path to transport an open width tubular knit web through a drying oven and/or a steaming station to a compressive treating station to improve quality of the open width tubular knit web. The frame includes a rail section. The rail section guides an associated chain with the pins through the predetermined path to transport the open width tubular knit web through the drying oven and/or the steaming station to the compressive treating station to improve the quality of the open width tubular knit web. The rail section has a pair of recessed tracks being longitudinal, facing in a same direction, being spaced-apart from each other by a space therebetween defined by a web, and receiving the chains.

Abstract: The invention relates to drawing systems using a series of jaws for the support, transport and drawing of the film (2), which are supported and guided by rails and driven by endless chains (3), connecting the jaws between the above. Each chain (3) is driven by two toothed wheels (6,7) of large diameter (D), one wheel (6) located at the beginning of the forward run (4) and the other wheel (7) located at the rear end of the return run (5) of the chain (3). Each wheel (6,7) is provided with motorised rotational drive means, said means being synchronised with each other. Such a drive device finds application in high speed drawing machines.

Abstract: A tenter system designed to be used for simultaneously treatment of two base fabrics for felts for paper machines, or similar products, an upper fabric (3) and a lower fabric (4), comprising a pair of tenter frames (6) for the upper fabric and a pair of tenter frames (7) for the lower fabric being adapted to grip respectively the upper and lower fabric along both edges of the fabrics through the heat treatment zone (5), and to maintain specified stretch in the direction transversally to the direction of fabric movement by allowing the two pairs of tenter frames (6, 7) to move in the transversal direction independently of each other, thereby allowing independent change of width of the two fabrics in the transversal direction.

Abstract: A clip has a frame and a flapper. Two dry bearings are inserted into a hole formed in the flapper. Then an attaching shaft is inserted from one of the holes in the frame to the other through the dry bearings, so as to swingably attaching the flapper to the frame. DAIDAYNE DDK 01 of DAIDO METAL Corp. is used as the dry bearing. A first and a second clip covers are provided to cover the clips. Fresh air feeding pipes are connected to the first and second clip covers. Fresh air is fed from the fresh air feeding pipes toward the clips through air outlets provided in the first and second clip covers.

Abstract: A fabric conveying guide rail has a G-shaped saddle locked to where below a conveying guide rail; screw holes being laterally drilled on both outer walls of the recess formed to the web of the saddle; a sleeve being positioned with tabs and slots of a setting nut to lock up the saddle; a guide screw being screwed into the nut; two saddles being mounted in symmetry on a laterally structured square tube; the setting nut being locked horizontally to the recess to define a space between the saddle and the top of the setting nut for insertion of a separation plate that is moved by adjusting the width of the guide screw to prevent the fabric from being contaminated by the guide screw.

Abstract: A joint is provided for articulately interconnecting the adjacent ends of rail assemblies in a tenter frame. The rail assemblies are arranged consecutively along a guide path, and have parallel guide channels for the advancing and returning legs of continuous chains carrying the clamps that grip the edges of the webs being transversely stretched. The joint includes flexible bands arranged to define intermediate channels connecting the guide channels of the rail assemblies. The flexible bands are resiliently deflected in response to articulation of the rail assemblies to thereby arcuately configure the outer medicate channels.

Abstract: A stentering machine having a horizontal drying zone and a vertical pretreatment zone for a web of material spread out between stentering chains is described. The stentering chains are brought from the vertical position into a horizontal position in a deflection zone. In order to achieve the result, in the case of a stentering chain with deflection about axes that stand vertical to the surface of the web of material, that the chain can be guided through the deflection zone with tilting of the linking pins, without damage to the pin bearings, the deflection pins are configured to be crowned elements. The deflection bolt bearings are shaped to correspond to the crowning of the pins.

Abstract: A stentering machine having a horizontal drying zone and a vertical pretreatment zone for a strip of material held spread out between tension chains configured as slide chains is described. The tension chains are brought from the vertical into the horizontal position in a deflection zone. In order to achieve the result that the slide pads that carry the tension chain, in each instance, make area contact with the related support guideways both in the horizontal, level region and in the curved region of the guide rails, the slide surfaces of the supporting slide pads that are affixed to the chain are divided into three consecutive zones, in the transport direction, namely a level edge zone, a curved center zone, and a second level edge zone.

Abstract: A stentering machine having a drying zone and a pretreatment zone for coating a web of material on both sides and drying it is described. One aim consists of deflecting a web of material coated in the vertical position and stretched out in width, in order to introduce it into a conventional flat tenter frame, without damaging the coating. According to the invention, the web of material is needled into a pair of stentering chains having a predetermined chain pitch, and deflected from the vertical into the horizontal position on such a large arc that the difference between the sum of the chain pitches that form the arc chords and the arc length itself becomes small enough to be ignored.

Abstract: A stentering machine having a drying zone and a pretreatment zone for coating a web of material on both sides and drying it is described. One aim consists of deflecting a web of material coated in the vertical position and stretched out in width, in order to introduce it into a conventional flat stentering frame, without damaging the coating. According to the invention, the web of material is needled into a pair of stentering chains having a predetermined chain pitch, and deflected from the vertical into the horizontal position on such a large arc that the difference between the sum of the chain pitches that form the arc chords and the arc length itself becomes small enough to be ignored.

Abstract: A tenter system designed to be used for simultaneously treatment of two base fabrics for felts for paper machines, or similar products, an upper fabric (3) and a lower fabric (4), comprising a pair of tenter frames (6) for the upper fabric and a pair of tenter frames (7) for the lower fabric being adapted to grip respectively the upper and lower fabric along both edges of the fabrics through the heat treatment zone (5), and to maintain specified stretch in the direction transversally to the direction of fabric movement by allowing the two pairs of tenter frames (6, 7) to move in the said transversal direction independently of each other, thereby allowing independent change of width of the two fabrics in said transversal direction.

Abstract: A method and apparatus continuously monitor the functional condition of the successive bearings of the tenter clips or claws of a tenter chain as the bearings roll along a contact surface of the endless guide rail of a tentering machine. A sensing arrangement is integrated into the guide rail in the area of the contact surface thereof. The sensing arrangement senses a physical value indicative of the presence and condition of the respective bearing passing by the sensing arrangement. The sensing arrangement may include a pressurized air outlet and an adjacent pressure measuring channel connected to a pressure sensor to sense the back pressure created by a passing bearing. The sensing arrangement may alternatively include an electromagnetic eddy current sensor, or an optoelectronic light beam sensor.

Abstract: A film production process having a film tentering step and a recovering step, characterized by detecting the side edge positions of the film running toward the recovering step, transferring the film running direction based on the detected information, and controlling the clamp start position of the film arriving at a tenter in the tentering step by clamp means, in the transverse direction of the film. A film production process having a film tentering step, characterized by controlling the clamp start position of a film arriving at a tenter by clamp means, in the range from 5 mm to 1,000 mm from the tip of the film in the longitudinal direction of the film.

Abstract: An improved apparatus for adapting speed, in particular for nippers (1) which can be made to travel along a rail arrangement (3), is distinguished by the following featuresa rotating and electrically conductive eddy-current body (17), preferably designed in the form of an eddy-current wheel or an eddy-current cylinder, is provided,the guide rail arrangement (3) runs at least over and away from a partial region of the eddy-current body (17) with a tangential component,on the carriages (1) which can be made to travel along the guide rail arrangement (3) there is provided or can be excited at least one magnet (7a, 7b), which is arranged on the side facing the eddy-current body (17) and, in the region of the eddy-current body (17), can be moved over and away from the eddy-current body (17), with an air gap being formed.

Abstract: Disclosed are an apparatus and method for simultaneously biaxially stretching a film (e.g., a continuous web of film). The apparatus includes upper and lower rails, for guiding a pair of endless links that each has link units for grasping side edges of the film. The endless links have upper and bottom rollers for being guided by (e.g., rolling on) the rails. The upper and bottom rollers are guided respectively by the upper and lower rails in different zones of the apparatus, the endless links being lifted and guided by the upper rail in one zone and being supported and guided by the lower rail in another zone. Since rolling, rather than sliding, friction occurs during movement of the endless links, amount of lubricant needed is decreased and dirt in the system due to large amounts of lubricant used, can be reduced.

Abstract: A guide rail for supporting the guide rollers of tenter clamps, in a tentering machine such as a film stretching machine, includes a plurality of spring steel bands clamped to a support member of the tentering machine by a clamping block and clamping bolt. To ensure that the guide rollers remain constantly in contact with the guide rail, the guide rail is elastically yieldable in the thickness direction to compensate for any tolerances or deviations in the arrangement or running operation of the guide rollers. At least one of the spring steel bands of the guide rail is spring-elastically deflectable in a thickness direction perpendicular to the lengthwise extension of the guide rail. In one embodiment, at least one of the spring steel bands is pre-curved to provide the necessary elastic spring characteristic.

Abstract: An improved transport device comprises a novel guide rail (3). Carriages (5) can be moved along the guide rail (3), which carriages comprise guide elements (25a, 25b; 25c, 25d) for this purpose, which elements are supported on rail guiding surfaces (17a, 17b; 17c, 17d) of the guide rail (3). The guide rail is held in a prestressed and/or damped manner with variable guide elements (25a, 25b; 25c, 25d) comprising, for example, sliding pieces or running rollers at the respective spacing of the ?sic!. As a result, the spacing distance between the rail guiding surfaces (17a, 17b; 17c, 17d) can automatically be adjusted to the variable, in each case given, spacing of the guide elements (25a, 25b; 25c, 25d).

Abstract: Spring steel tapes are shaped with tape edge sections extending alongside a central tape section having a constant thickness, so that the thickness of the tape edge sections diminishes from the central section to the edges. Such tapes are combined in tape packages to form guide rails for tentering clamps, whereby a continuous contact between tentering clamp guide rollers and the guide rails is assured.

Abstract: A new low-profile tentering system for a tenter machine is realized according to the present invention by a tenter frame including low-profile rail assemblies for carrying an endless carrier. A series of attachment blocks of the endless carrier have tentering connectors to provide for transporting a sheet material under widthwise tension in a longitudinal path through the tenter machine.Each rail assembly has guideways for supporting and carrying an endless carrier within the guideways. The tentering system of this invention uniquely uses a plurality spherical bearing balls for transporting the endless carrier within slots of the guideways. The endless carrier includes an endless belt or endless chain connecting a series of attachment blocks for holding the bearing balls in a position so that they can freely rotate within the guideways. Tentering connectors are carried by the attachment blocks of the endless carrier for supporting spaced apart edges of the sheet material.

Abstract: Tenter frame apparatus includes an endless chain for carrying tenter clips (A) on one side of a monorail (B) for positioning a web (W) for transport on a single pair of longitudinally aligned bearings (C) carried in horizontal alignment with the web (W), and for guidance on a stationary track (D) by a wear strip (E) first opposed wear pads (F) opposite the bearings and second opposed wear pads (G) at the top of the monorail. Since the bearings (C) do not engage drive sprockets at turnarounds impact and high loads are avoided. In some applications wear strips may be substituted for the bearings (C).

Abstract: An improved device for producing longitudinally and/or transversely drawn-out foil webs, in particular foil webs simultaneously drawn-out along two axes, is characterized in that the actual clamping means that hold the edges of the foil are held and anchored, together with the nipper carriage that carries them, by means of an overlying bridge so as to leave a gap under the bridge in the cross view. A shielding wall projects upwards into the gap. The top edge of the wall ends above the plane of the foil web.

Abstract: A tenter clip is fastened on a double-T web support of a film stretching machine and has a flexible, vertically clamped guide strip, against which horizontal running rollers bear. Each of these running rollers is equipped with a covering for dust protection. The tenter clip comprises a clamping body and a rolling part. The three horizontal running rollers and the vertical running roller of the clamping body are covered by a protective hood, the shape of which is matched to the geometry of the running rollers.

Abstract: An improved transport device for a moving material web, in particular a stretching system for plastic film webs which is in particular suitable for high circulating speeds, is distinguished by the fact that a guide rail system (3) comprising at least one guide rail (3', 3") and along which tenter elements (1) can be moved by means of a linear motor drive (5), is integrally incorporated in the relevant linear motor (5', 5"). The respective tenter element (1) is supported with respect to the guide rail system (3) by means of a sliding bearing or a combined sliding and roller bearing.

Abstract: An improved transport device for a moving material web, in particular a stretching system for plastic film webs, comprises tenter elements (1) which can be moved along a guide rail system (3) on both sides of the material web (11). In this case, on both sides of the moving material web (11), a linear motor (5', 5") and a guide rail (3', 3") are provided, preferably in each case at least above and below the moving material web (11). The sequence of the guide rails located above, in relation to the linear motor, is opposite with respect to the moving material web, to the linear motors located below and the guide rail located below. In an alternative preferred embodiment, a maximum vertical and a maximum horizontal distance (a, b) are provided between a point of intersection (S) at the clamping point of the material web (11), which distance is selected such that the tenter mounting is stressed as little as possible.

Abstract: Woven or knit fabric is pre-tentered (stretched) prior to hydroenhancement treatment to a predetermined width in excess of the desired finished width of the fabric. The pre-tentering width is selected so that the expected shrinkage caused by the hydroenhancing process reduces the width of the enhanced fabric to slightly less than the desired finished width. The fabric is post-tentered hydroenhancing process only by a slight amount to the exact desired finished width. Since only a slight increase in width is required, there is very little loss in cover of the enhanced fabric. Post-tentering to a slight increase in width will also provide a slight tension for holding the fabric in the tenter clips and prevent the fabric from dragging in the tenter.

Abstract: Tenter frame apparatus includes an endless chain for carrying tenter clips (A) on one side of a monorail (B) for positioning a web (W) for transport on a single pair of longitudinally aligned bearings (C) carried in horizontal alignment with the web (W), and for guidance on a stationary track (D) by a wear strip (E), first opposed wear pads (F) opposite the bearings, and second opposed wear pads (G) at the top of the monorail.

Abstract: A thermoplastic film web is subjected to a defined shrinking in a treatment apparatus with two mirror-symmetrically arranged tentering chains. For this purpose, each chain is equipped with tentering clamps that have a variable on-center spacing or pitch in the travel direction of the tentering chains, and which additionally are position adjustable in a direction other than the travel direction. The entire clamp body or clamp elements may be position variable in a direction other than the travel direction. In operation, the pitch is first reduced in the inlet and/or heating zone of the treatment apparatus. Simultaneously, the clamping position of the individual clamps or clamping element is changed, e.g. by tilting or lifting. The clamp position change takes up extra film web length resulting from the pitch change, whereby the film web assumes throughout its width a corrugated configuration. Then, the film web is cross-stretched.

Abstract: A thermoplastic film stretching apparatus includes a first and a second separate transport chain system including the respective guide tracks and tentering clamps. The tentering clamps are guided without the conventional chain plate connections. The first chain transport system performs the tentering clamp transport from the inlet of the system to the setting zone of the system, where the tentering clamps are released by the first transport chain system and taken over by the second transport chain system. The transport of the tentering clamps by the second system through the setting zone, the cooling zone, and along the way to the outlet zone of the film stretcher, takes place with a smaller transport speed than that of the first transport system. The speed difference between the first and second transport chains is the measure for the film shrinkage to be imposed onto the thermoplastic film.

Abstract: Conventional clips must be manufactured with high precision and run the risk of becoming stiff in the course of time or even to become inoperative in extreme cases due to sediments in their pivoting mechanism. In order to obtain a clip which remains operational in spite of sediments and the danger of clogging and which is furthermore easy to assemble and disassemble, the clip lever is supported with a first bearing part on another bearing part on the side of the clip body, forming a kind of rocking bearing. The rocking bearing can in particular be composed of a knife-edge or rolling bearing. This clip is particularly useful for plastics stretching machines.

Abstract: A tentering machine having a compliant drive link allows for a considerable rate of stretch in a tentered fabric, web or film without the distortion or bowing frequently observed with the tentering machines of the prior art. The tentering machine includes two conveyor tracks adjacent to and facing one another, each conveyor track having a number of fabric edge holders slidingly directable thereabout. A fabric, web or film, grasped on opposite edges by the fabric edge holders, is conveyed thereby through the tentering machine in the space between the two conveyor tracks. Widthwise stretching occurs where the conveyor tracks of the tentering machine have sections on each side of the fabric which diverge from one another, while the two conveyor tracks may be parallel to each other on the two sides of the fabric in applications where prevention of shrinkage is of interest. The fabric edge holders on each conveyor track are run at a substantially common speed by drive chains.

Abstract: A tentering system having a pair of spaced tenter rails defining a first end, a second end and a tentering path, and moveable material securement members carried by the tenter rails is disclosed. The tentering system may include first material guides at the first end of the tenter rails and second material guides at the second end of the tenter rails, and at least one drive motor for alternately and selectively driving the securement members in the first and second directions. In addition or in the alternative, a pair of direct drive motors is provided at the first end of the tenter rails, each of the direct drive motors including a clutch moveable between a drive position and a neutral position, and clutch actuating means to selectively and positively move the clutch from the neutral position to the drive position. In addition or in the alternative, first and second pairs of direct drive motors are provided at the first and second ends of the tenter rails, respectively.

Abstract: A tentering chain has a continuously adjustable chain pitch for the simultaneous biaxial treatment of film webs. Tenter bodies conventionally equipped with clamps or hooks for gripping an edge of the film web are carried by the tentering chain. Guide rails operate the tenter clamps. Neighboring tenter bodies are interconnected by chain links. Each chain link is connected by a hinging connection at each end to the respective tenter body. At least one of the two hinging connections of a chain link is adjustable by a hinging bolt having an eccentric section or sections and a circular section or sections. The adjustable eccentric hinging bolts are mounted for rotation in the tenter bodies and the eccentric section engages the respective end of the chain link. For this purpose the chain link has a bore in which the eccentric section is received.

Abstract: An assembly for a stretching frame has a rectangular cross section rail, a multiplicity of carriages displaceable along the rail and formed with shanks which have offset pairs of rollers engaging the surface of the rail perpendicular and parallel to the plane, and couplings on the shanks located substantially in the median plane between the surfaces of the rail perpendicular to the frame for engagement by respective transport devices.

Abstract: The present invention provides a conveyor chain for textile processing machines in which a lubricant supply is safeguarded at all times in the event of maximum mechanical stressing. The conveyor chain is connected to a center clip body 1 by a pin 2, the pin 2 being surrounded by a link bushing 11 which has a transverse bore 27 for the lubricant supply of an antifriction bearing 10 surrounding the link bushing by lubricant ducts 23, 25 being defined within the pin 2; and at least one side bar 13 is supported on the link bushing 11. The link bushing 11 is coupled to the side bar 13 in a manner to preclude rotation of the link bushing. Between a roller element 20 and the link bushing 11, an internal ring 19 is provided and staggered axially relative to the transverse bore 27, and the antifriction bearing is bounded in an axial direction by at least one cover plate 15.

Abstract: A tenter frame is illustrated wherein a chain is fabricated by press fitting a pin receiving bushing constructed of Vespel and the like into a steel bushing and then boring a pin receiving opening therein and utilizing wear strips constructed of Vespel in a dovetail configuration opposite the tenter chain providing a lubrication free tenter wherein the chain may be tensioned without excessive stretching. Also illustrated are lubrication-free tenter-clip jaw pivot bushings.

Abstract: The invention relates to a conveyor chain for machines for tensioning lengths of material, with pairs of outer fishplates and pairs of inner fishplates flexibly connected by chain joint bolts and with support members for grippers or needle plates. The pairs of inner fishplates are supported by means of joint sleeves on the chain joint bolts, needle bearings are arranged between the joint sleeves and the chain joint bolts and ball bearings are provided on the outer peripheral surfaces of these chain joint bolts. These ball bearings are constructed like roller bearings with particularly thick outer races, and the outermost outer fishplates rest with a bore clearance on the chain joint bolts. This conveyor chain is distinguished by a simple and stable construction which requires little maintenance.

Abstract: A tenter frame is illustrated wherein a chain is fabricated by press fitting a pin receiving bushing constructed of Vespel and the like into a steel bushing and then boring a pin receiving opening therein and utilizing wear strips constructed of Vespel in a dovetail configuration opposite the tenter chain providing a lubrication free tenter wherein the chain may be tensioned without excessive stretching.

Abstract: After leaving the hot lye bath (2) the fabric web (1) is immediately cooled down in a cooling zone (C) and only then passed to a residence zone (5) in which the lye acts on the fabric. Stretcing of the fabric web is then effected in a widthwise stretching zone (E), wherein it is again heated, preferably by a feed of hot weak lye. That combination of method steps provides optimum mercerizing effects with careful removal of shrinkage of the fabric.

Abstract: The present tenter frame chain includes a plurality of links, each link including upper and lower interconnected loadbearing plates, and a low friction slide block sandwich between the upper and lower interconnected plates. The slde block is formed of material having a lower coefficient of friction than the interconnected loadbearing plates and includes a vertically disposed bearing surface located laterally outwardly beyond the lateral extent of one side of the upper and lower interconnected loadbearing plates. The vertically disposed bearing surface of the slide block contacts the bearing surface of the guide rail to reduce the frictional rubbing movement of the tenter chain against the vertically disposed bearing surface of each of the tenter chain guide rails as the tenter chain moves therealong.

Abstract: A thermoplastic material web is stretched transverse to the machine direction along a stretch course which widens exponentially in the stretching zone, an improved stretching apparatus being used to effect such stretching.

Abstract: A chain conveyor of a fabric web stretching machine includes input and output sides of the machine, an endless roller chain having a forward and rearward running parts, chain links, chain bolts absorbing longitudinal chain forces, stretching devices disposed at each of the chain links, a guide rail disposed at the forward running part forming a support for horizontally directed transverse forces to be exerted on the fabric web, chain wheels disposed at the input and output sides of the machine forming transitions between the forward and backward running parts each having teeth engaging in the chain at respective longitudinal ends of the guide rail, a transverse force roller being associated with each of the stretching devices for transferring transverse forces, roller bearings on which the transverse force rollers are supported about a vertical axis coaxial to a respective one of the chain bolts, the transverse force rollers abutting an outer surface of the guide rail facing away from the fabric web, the toot

Abstract: The links (1) of a chain such as a tentering chain are respectively connected to each other by pins (6). In order to secure the pin against rotating and against axial shifting, an end of the pin (6) protruding beyond an outer surface of a lug (2) of the chain link (1) is provided with a radial bore (7) into which one prong (8) of a two pronged spring clip element (9) is inserted. The other prong (10) of the spring clip element (9) partially encircles the protruding end of the pin (6). A shoulder (14) projects from the outer surface of the lug (2) and a groove (13) extends into said shoulder so that a bottom (12) of the groove (13) forms a stop surface perpendicular to the lug plane. One end (15) of the one prong (8) and a transition part (11) between the two prongs (8, 10) rest against the stop surface for securely holding the spring clip element in place.

Abstract: Stenter apparatus for stretching film comprises stenter frame clip chain assemblies adapted to grip opposite edges of the film. Each chain assembly includes a plurality of chain clip units (5) which are movable on a double track rail system (3, 4). Each clip unit (5) carries a series of rollers wherein rollers (10a, 10b) with a horizontal axis run on an edge of a track (4) for chain weight support while a plurality of vertical axis rollers (7a, 7b, 8, 9, 12) engage side surfaces of the track assembly to resist horizontal loading. A further roller (11) serves to prevent uplift of the chain assembly. The clip units (5) are linked by articulating link means comprising spaced link plates (21, 22) pivotally carried by link pins (23) in the clip units, each link pin additionally serving to support a drive roller (15). A film clip (6) is located on each chain clip unit (5) and above the articulating link means. Preferably the tracks (3, 4 ) are spaced vertically.