Patent GB-1136709-A (GB)
Title: Improvements in or relating to tenter frames
Inventor: GAGEUR FRITZ
IPC: D06C3/02
Filed: 1967-06-19
Abstract: 1,136,709. Tenter frames for stretching film webs. LINDAUER DORNIER G.m.b.H. 19 June, 1967 [25 Aug., 1966], No. 28080/67. Addition to 1,080,915. Heading B5B. [Also in Division D1] The tenter frame of the parent Specification (wherein a flexible jointless and vertically extending guide rail constitutes bearing surfaces for rollers mounted on clips, for gripping the edges of a travelling film web to be stretched, which rollers counteract horizontal forces acting on the clips and which rollers are disposed on each side of the rail with small clearances) is modified in that the guide rail is supported from the side thereof remote from the travelling film web to be stretched in such a manner that, both above and below such support, running surfaces for the horizontal running rollers of the clips are provided substantially symmetrically of the plane of the web. In the embodiment of the modified apparatus shown in Figs. 1 to 3, a chain track carrier 16 is located with the clip chain in a housing 38. The vertical guide rail 14 is mounted by means of bolts 36 and nuts 15 in a web 35 or on individual spaced supports 35 extending from the rear wall of the housing 38 towards the path of the travelling film web to be stretched. As in the parent Specification, the guide rail 14 comprises a bank of flexible, continuous strips of spring steel. The axis of the guide rail holding bolts 36 is at the same level as the clip platen 5 which cooperates with the clip or gripper 3 pivotally mounted on the pin 6 which is fixedly mounted on the arms 2 of the clip-carrying body 1. The clip body 1 is provided on its side facing away from the film web with upper arms 7 carrying the rollers 8 and 9 and lower arms 7<SP>1</SP> carrying rollers 8<SP>1</SP> and 9<SP>1</SP>. The rollers 8 and 9 run on the tracks of the portion of the guide rail 14 above the level of the support member 35 and the rollers 81 and 9<SP>1</SP> on the tracks of the portion of the guide rail 14 below the support member 35. The rollers 8 and 8<SP>1</SP> are on the side of the guide rail facing the film web being stretched and the rollers 9 and 9<SP>1</SP> on the other side, two rollers 9 being opposite the roller 8 and two rollers 9<SP>1</SP> opposite the roller 8<SP>1</SP>. Between the sets of upper rollers and lower rollers running on the guide rail and at the level of the guide rail support member 35 is located the member which connects the individual clips in an endless chain. Each clip has two chain rollers 11 connected within the clip by means of roller bushes and a pair of connecting links 12, 12<SP>1</SP>. The connection to the next clips of the chain is made by a further pair of connecting links 13, 13<SP>1</SP>. The lower connecting link 13<SP>1</SP> has a tongue 37 which is bent downwardly (Fig. 3) and is provided with a vertical roller 10 which runs on the track 26 (Figs. 1 and 2) and carries the weight of the clip chain. As shown in Fig. 2, the tongues of the lower connecting links 13<SP>1</SP> are arranged alternately on the side of the chain facing the film being stretched and on the other side of the chain. The tongue 37<SP>1</SP> is provided with a roller 10<SP>1</SP> which also carries the weight of the clip chain and runs on a longitudinal track (not shown) parallel with the track 26.