Patent GB-254374-A (GB)
Title: Improvements in and relating to embroidery machines
IPC: D05B21/00
Filed: 1925-01-08
Abstract: 254,374. Gahlert, F. J., and Bretschneider, M. Jan. 8, 1925. Embroidery machines. - The jacquard needles are carried by pairs of separately slidable plates having slots therein which engage and communicate movement alternatively in opposite directions to pairs of levers, pivotally mounted on a shaft and actuating sun - wheels freely mounted on the shaft which in turn actuate levercarried planet wheels geared to a terminal gear member by which the summation of the movements produced by the various jacquard needles is transmitted to a work-frame. The pairs of plates 2, 3 carrying the jacquard needles 6, 7 have upwardly and downwardly inclined slots 9, 10 in which engages a stud 12 projecting from a lever 16, 17 freely mounted on a shaft 8. There is a set of holes in the jacquard card for each pair of needles which holes are so arranged that at any actuating movement either the needle 6, or the needle 7 or else both needles enter a hole thus effecting a positive or negetive or no movement of the lever. When one of the needles enters a hole, the other one being engaged by the cord and forced back, the slot in the plate of the latter causes the movement of the stud 12 which also acts to lock the first plate against movement by engagement with the flared entrance of its slot. The lever 16, 17, and a lever 19, 20 carry pairs of planet wheels meshing with pairs of sun wheels 25, 25<1>, 26, 26<1> mounted freely on the shaft and together with a pair of locking levers 15, 18, Fig. 2, are actuated by similar pairs of needle-carrying plates. The movements of the sun wheels are transmitted through differential gearing 33-35 to a pinion 38 meshing with a rack 39 producing one of the two component motions of the work-frame. The sun-wheels 25, 25<1> are adapted to be clutched together by teeth 48, 48<1> actuated by a clutchlever 45. The various mechanisms of the machine are actuated by a shaft 51 on which is fixed a pulley 53. A cam pair 55, 56 is mounted loosely on the shaft and is clutched thereto by a spring locking-pin 57. A link 66 actuated by a cam track 61 is connected to a cross-piece 76 joining two sliding rods 67, 67<1> mounted on which are lever 45 is actuated by a cam-track 50 and is provided with arcuate extensions 46, 46<1> which engage pattern-card guide-plates 78, 79 having holes therein for the jacquard needles. The clutchlever 45 is actuated by a cam-track 50 and is provided with arcuate extensions 46, 46<1> which engage slots 47, 47<1> of the teeth 48, 48<1> and act as cams to move them in guides 49, 49<1> mounted on the levers 15, 18. The form of the arcuate extensions allows the lever to operate the clutch teeth in spite of the displacement of the guides 49, 49<1> owing to the movement of the levers 15, 18 by jacquard needles. A link 70' connects the lever 45 to a pair of levers 72, 73<1> connected to a frame 84 by a pivot 83 about which it may be turned after a locking pin 86 has been moved out of engagement with a lug 85. The frame 84 carries pins 87, 87<1> which engage slots 88 in the plates 78. 79 and lift the plates together with the card, the frame making its return movement when the plates and card are moved forward to actuate the needles. Cam-actuated levers 44<1>, 74<111> are provided which carry locking teeth 42, 41 moved to lock the sun wheels 26, 26<1> and 25, 25<1> respectively during the actual stitch-formation. Sets a, b of jacquard mechanism, each of the construction described, are combined as shown in Fig. 7 to produce the movements of the work-frame 90, the movements of the end pinions of the sets being communicated to racks 39, 39<1> formed on bars 89, 89<1> carrying guides 93 and 94. 95 respectively, in which can move the bars 97, 98 of a member supporting the frame 90. The bars 97, 98 being at right-angles, the two rectangular components of displacement are conveyed to the work frame. A set of work frames for embroidery machines may be actuated in parallel by connecting the work frames to a bar of a parallel linkage actuated bv the jacquard mechanism. A work frame is adjustably mounted on the supporting rod 98 by means of a slotted arcuate bar 115 engaged by screw studs 117, 117' entering luge in the frame 90 and having a clamp screw connection 114 with the rod 98.