Abstract: A link device for stretching a sheet material consists of pantograph-like link member units having a sub-link held substantially at a right angle to the running direction and rollers fitted to said sub-link. Due to the low running resistance of the rollers and the pantograph-like structure composed of long and short links, an endless guide-rail can be introduced in the stretching apparatus for a sheet material and the running of the chain can be stabilized, thereby resulting in a high-speed stable stretching operation. Reduction of the running resistance makes it easy to adjust the stretching ratios according to the desired stretching conditions.

Abstract: The guide track for a tentering chain carrying roller-supported tenter clips or clamps has two band-shaped flexible parallel guide rails extending horizontally along the edge of a material web, but protruding in an upright or on-edge manner perpendicular to the material web. The tenter clips have running rollers arranged in the material tentering plane and contacting respective opposite vertical surfaces of the guide rail arranged closer to the material web for taking up horizontal forces. The tenter clip reaches around the two guide rails in a C-shape so that an upper support roller contacts the upper edge of the guide rail lying closer to the material web for supporting the weight of the tenter clip and so that a lower support roller contacts the lower edge of the other guide rail for taking up any tipping or tilting moments of the tenter clip.

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 invention relates to a tensioning chain provided with grippers in which the gripper body is made from cast spheroidal graphite or high-grade cast steel, the arms for pivot mounting of the gripper flap run at an angle upwards, the angle between the two arms of the gripper flap is kept small and the ratio of length to diameter of the link pins is between 1:0.9 and 1:1.5. Such a gripper is distinguished in particular by a particularly low overall height.

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.

Abstract: A tenter frame clip wherein the metal-to-metal contact between the clamping arm and the clip body is cushioned by elastomeric material. The cushioning material can be located on the clip body at the point of contact with the arm, or on a rocker member hinged to the arm and located beneath a strike plate attached to the body.

Abstract: Web-stretching apparatus wherein the web, gripped by web-gripping devices mounted to carriages which run on guide rails, is stretched by increasing the distance between adjacent gripping devices by altering the degree of extension of an articulated chain to which the carriages are attached.

Abstract: This invention relates to an improvement in a clip-chain track for tenter clips, with roller guidance in tenter frames for sheet material, composed of a clip-chain support with rod-like, endless and jointless guide rails of small cross-section mounted pairwise to the clip-chain support on both sides of the tensioning plane of the tenter chain, and with tensioning clip rollers resting by their running surfaces against the guide rails, the improvement comprising vertical spindle means connected to a clip body of the tenter clips and mounting separate support rollers and running rollers on both sides of a tensioning plane of a sheet material in two separate transverse planes of the spindle means, with the support rollers absorbing vertical forces and having slanted running surfaces of opposite inclinations, and separate support rails mounted on one side of their associated support rollers and running rails mounted on the other side of their associated running rollers in the transverse planes at the clip-chain su

Abstract: This invention relates to the bases of tentering clips pivotally connected to form an endless tentering chain and specifically to a structure wherein the sprocket rollers and the stress rollers are located upon the same shaft in vertical alignment.

Abstract: This invention relates to an apparatus for cleaning the clamping surfaces of tenter hook or clip tables and small flaps of tenter hooks or clips during the operation of a tenter hook or clip chain, which comprises a carrier member secured to a tenter hook or clip chain/guide path, an axle vertically positioned with respect to said path, a brush mounting unit supported by said axle and having upwardly and downwardly directed rows of brushes, said brush mounting unit being pivotal on said axle and flexibly connected with the carrier member by a resilient member and, in a position of rest thereof, being positioned so as to be pivoted away from the tenter hook or clip, said brush mounting unit, in the operating position thereof, being pivoted against the tenter hooks or clips in the open position thereof, and whereby the upper row of brushes scrapes and brushes clamping surfaces of the small flaps, and the lower row of brushes scrapes and brushes clamping surfaces of the tenter hook or clip tables.

Abstract: A tenter clip comprising a material gripping element and a base element which are connected to each other by screw means and the gripping element is held in proper alignment with the base element by means of pintles which serve the dual function of connecting the base element to adjacent links of the tenter chain and also for maintaining the gripper element in proper alignment with said base element.

Abstract: This invention relates to the base of tentering clips pivotally connected to form an endless tentering chain and specifically to a structure wherein three rollers are placed in tandem on opposite sides of the base and wherein the roller shaft is also the pivotal connection between adjacent clips.