Patent GB-1124824-A (GB)
Title: Apparatus for folding a moving strip of flexible material
IPC: B29C53/04
Filed: 1965-09-01
Abstract: 1,124,824. Folding fabrics. PIRELLI S.p.A. 1 Sept., 1965 [2 Sept., 1964], No. 37265/65. Heading D1S. Apparatus for longitudinaHy folding a moving strip 187 of fabric comprises means to move the strip 187 forwards in the direction of its length and at least one disc 90 co-operating with an annular air tube 94 whose mid-circumferential plane coincides with that of the disc 90. Preferably, the fabric is a rubberized weftless tyre cord fabric to be used as a reinforcing structure in pneumatic tyres for motor vehicles. Pieces of bias-cut cord fabric are spliced on a table 1, Figs. 1 and 2 (both not shown), stored in scrays 2, 3, passed to a centering device 4 and folded at a station 5. The fabric may then be wound up at a station 9 or passed through another storage unit 6. a second centering device 7, longitudinally folded a second time at a station 8 and then wound up at the station 9. After being spliced, the fabric 187 passes over idler rollers 48. 49. 50, Fig. 3 (not shown), over a roller 40 driven by a motor 26 into the scray 2 from which it passes over a roller 41 driven by a motor 27 and over an idler roller 51 into the scray 3. If splicing is interrupted, a photoelectric cell 15 stops the motor 26 which may be reactuated by a foot control lever 16 through a microswitch 18. In the stray 2 if the level of the strip 187 descends below a photoelectric cell and light source 53 the motor 26 is stopped and if the strip 187 rises above the level of a photoelectric cell and light source 52 the motor 27 supplying the scray 3 is stopped. The fabric passes between adjustable guides 63. 64, Fig. 5 (not shown), and over a rotatably mounted hollow roller 61, see also Fig. 7, under a roller 70. over a roller 71 and through the nip between a thin disc 72 and a rubber-covered roller 76 rotatably mounted on a shaft 79 fast with the upper end of a hollow cylinder 80. Fig. 9 (not shown), inserted in a second hollow cylinder 81 integral with a bar 75 on which the disc 72 is mounted. A spring 86 urges the disc 72 and the roller 76 together. A screw 86 is provided so that the roller 76 can be temporarily moved away from the disc 72. The shirts of the strip 187 projecting at the sides of the disc 172 are partially bent downward by the roller 76. The fabric then passes between two discs 90. 91, aligned with the disc 72. and the annular air tube 94. The discs 72, 90, 91 are connected together by a belt 95, of textile or metallic cord, encased within peripheral grooves in the discs. The air tube 94 is rotatably mounted on a shaft 98, Figs. 10 and 11 (both not shown), and may be moved away from the discs 90, 91 by clockwise rotation of a handle 104 to a position 104', Fig. 7, to engage a pawl 107, Fig. 11, in a notch 106 in a sector 105. The air tube 94 pushes the downwardly inclined skirts of the fabric 187 towards the faces of the discs 90, 91. The fabric 187 then passes between a pair of vertical idler rollers 114, 115, whose height is smaller than the width of the folded fabric 187. The roller 115 may be moved away from the roller 114, against the action of a compression spring 138. Fig. 14 (not shown), by clockwise rotation of a lever 130. Figs. 12 and 13 (both not shown). The rollers 114, 115 press the two skirts of the fabric. together adjacent to the fold so that they stick together. The fabric then passes between vertical idler rollers 141. 142 whose height is at least equal to the whole width of the folded fabric. The roller 142 may be moved away from the roller 141 by clockwise rotation of a lever 155, Figs. 12 and 13 (both not shown), against the action of a spring (not shown). The rollers 141, 142 press the whole of the skirts of the fabric together so that they completely stick together. The folded fabric then passes under a roller 161 and between rollers 167, 168 to be wound on the roller 168. The roller 167 is driven by a motor 166. During the initial threading of the fabric 187 through the machine the roller 168 is moved away from the roller 167 by clockwise rotation of a lever 174. If it is desired to make a second fold, the once-folded strip 187 is passed over the roller 161, under a roller 177, between rollers 178, 179, through the scray 6 and the centering device 7 to the folding station 8 similar to the station 5, and is then wound on the roll 168.