Patent GB-915896-A (GB)
Title: A device for tying two thread ends
IPC: B65H69/04
Filed: 1960-05-24
Abstract: 915,896. Knot-tying devices. MESSA, D. May 24, 1960 [March 10, 1960], No. 18291/60. Class 112. In a device adapted to tie a barrel knot, i.e. one of the form shown in Fig. 10, in the ends of threads 70, 71, the threads are spaced at opposite sides of a fixed member and are bent around respective fixed pins located at the opposite ends of and spaced from the fixed member, the thread ends being held by members which are disposed at opposite ends of the fixed member and are adapted to rotate and to move along the axis of rotation, whereby the two sets of windings of the knot are commenced at locations immediately inward of the pins and are formed progressively towards the fixed member. The device comprises a frame 1 from the ends of which rise heads 2, 3 in which coaxial sleeves 8, 9 are rotatably and slidably mounted. Slots 4, 5 in the tops of the heads can communicate with corresponding longitudinal slots in the sleeves. Coaxial with the sleeves are fixed members 14, 15 formed at their inner ends with upstanding pins 12, 13. A shaft 38, journalled between the lower parts of the heads, can be rotated by a crank 39, and carries gears 50, 53 coupled by respective trains of gearing to the sleeves. The arrangement is such that for one revolution of shaft 38, one sleeve rotates n revolutions and the other sleeve n + 1 revolutions in the opposite direction. Crank 39 is normally held by a spring catch 115 which is manually depressed to release the crank and re-engages the latter after this has made one revolution. Circumferential grooves 103, 104 in the sleeves are engaged by the upper ends of arms 105, 106 which are pivoted at their lower ends on fixed pins 107, 108. Rollers 109, 110 on the arms are biased by springs 111, 112 against face cams 113, 114 on shaft 38, whereby, during one revolution of the latter the sleeves are moved inwardly and return to their original positions. Arms 20, 21 projecting radially from the sleeves carry spring-biased thread clamps 16, 17. Mounted fixedly between the pins 12, 13 is a plate 28 on either side of which is a movable thread-cutting blade 33, 34 pivoted on a bar 36, 37. Mounted slidably on the latter outwardly of blades 33, 34 are blades 29, 30 which are prevented from rotating by a pin 35. The blades are pressed inwardly by springs 31, 32. Blades 29, 30 carry spring clamps 62, 63. The blades 33, 34 are connected to pivoted arms 44, 45 which carry rollers 46, 47 engaged in cam grooves 40, 41 on shaft 38. Spring clamps 6, 7 are carried outwardly of sleeve 8, 9 on arms 133, 134 carrying rollers 135, 136 which are engaged in cam slots 137, 138 formed in fixed plates 139, 140. Arms 133, 134 are pivoted to arms 124, 125 which are pivoted intermediately at 126, 127 to a fixed plate 120, and are interconnected by a pin-andslot connection 130. Springs 128, 129, acting on arms 124, 125, bias the rollers 135, 136 to the bottoms of the slots 137, 138. An arm 121, also pivoted at 126, is provided at one end with a handle and abuts arm 125 at its other end. In use, the thread 70 is passed through clamp 6, through slot 4 into sleeve 8, between clamp 63 and blade 30, around pin 13, through clamp 17, through a fixed thread guide 23, and between scissor blades 25, 27, the movable blade 27 of which is then operated to trim the thread end. The thread 71 is similarly passed through clamp 7, through slot 5 into sleeve 8, between clamp 62 and blade 29, around pin 12, through clamp 16, through a fixed thread-guide 22, and between scissor blades 24, 26 the movable blade 26 of which is then operated to trim the thread end. Crank 39 is then rotated, when the clamps 16, 17 carry the thread ends held therein around the other threads the desired number of times before the blades 33, 34 open to grip the thread ends. In closing, the blades 33, 34 draw the latter through the clamps 16, 17, and after severing the thread ends clamp these against the plate 28. Arm 121 is then operated, when clamps 6, 7 move upwardly and outwardly to shift the threads out of the sleeves and clamps and to tighten the knot.