Patent GB-272749-A (GB)
Title: Improvement in a mattress roll forming and stitching machine
IPC: D05B73/12
Filed: 1926-10-20
Abstract: 272,749. Droll, J. W. Oct. 20, 1926. Sewing padded edges of mattresses.-A mattress-roll forming and stitching machine comprises a frame 1, Fig. 1, mounted by means of rollers to traverse tracks round a table 2. A frame 9 is vertically adjustable by screw gearing actuated by a handle 16 on the frame 1 and carries a head 7 pivotally and adjustably mounted at 19 The actuating-cams for the mechanism are mounted on a shaft 22. The mechanism for packing the stuffing into a mattress cover comprises a pair of needles f<1>, Fig. 7, slidable in guides f<2> which are mounted to slide in arcuate guides f<3>. The needles are moved in the guides f<2> to penetrate the work by links f<4> and geared arms f<6> moved by a lever f<9> having a cam follower f<11>. After the work-penetrating movement the guides f<2> are moved around the guides f<3>, to produce the packing movement of the needles, by a cam-actuated linkage including members f<12>, f<13>, f<14>, f<16>, f<17>, Figs. 7 and 8, Plungers f<21> hold the work for the serving operation and these are operated by racks and pinions f<22>, f<23> a linkage f<26>, f<29> and a roller f<32> engaging a slot in a member f<34> moving with the camactuated lever f<18>, the timing being such that the blocks engage the roll formed by the needles and hold it in place when the needles are withdrawn. Grippers f<36> facilitate the action of the needles by engaging the mattress and compressing it, and these are actuated by a link f<38> connected to a needle-actuating arm f<6>. Single-thread lock-stitching; needles, vibrating' laterally.-The roll held by the plungers f<21> is actuated by a jogging hook needle s<1> which forms in consequence in co-operation with a bobbin s<46> in a rotatable hook body s<36> a single thread lock stitch. The needle is vibrated along a guide s<3> by link connections s<6>, s<4> with a member s
 sliding on a block s<9> and having a roll s<11> engaging the cam track 24. The needle is jogged between alternate strokes by a cam-actuated lever s<12> which displaces a carrier s<17> connected to the forward end of the guide s<3> which is pivotally mounted at the rear. The needle has an open eye s<19>, Fig. 12, and is mounted on a hollow shank s<22>, Fig. 15, secured to the carrier by a spring plunger catch. A plunger s<27> in the .shank s<22> carries a stem s<28> extending along a groove s<29> in the under side of the needle and is normally held by a spring s<31> so that the stem closes the needle eye. When the needle approaches the limit of its forward movement, a rod s<352> extending from a slidable member s<33> on the carrier into the interior of the shank is caused by engagement of the member s<33> with a fixed part of the frame to force back the plunger so that the eye is uncovered. The bobbin s<46> is mounted in a casing s<39> non-rotatably mounted within the rotatable sleeve s<36> which forms the hook body. The thread s<47> from the bobbin passes round a sheave s<48> rotatably mounted on the casing s<39> and periodically released by the withdrawal of a locking pin from one of a set of apertures s<52 >to allow thread to be drawn off. The hook s<36> has a series of gear slots in which engage the teeth of a gear wheel s<63>, Fig. 24, geared to a rack s<71> reciprocated by linkage connections s<72> - - s<77>, Fig. 6, actuated by the cam track 26. A take-up device mounted adjacent the shuttle consists of a disc s<78> having a hook s<81> which enters a slot s<57> and engages the thread extending across it, as shown in Fig. 20, and carries a loop of thread round a pair of sheaves s<82> mounted on the disc. The disc is operated in timed relation to the shuttle by a rack s<83> engaging a pinion s<84> and actuated from the main cam through a linkage. The rack s<83> also engages a lever which effects the release of the thread-locking sheave to allow thread to be drawn from the bobbin. A threading device for the needle consists of a member s<94>, Fig. 26, having a notch for the thread and mounted in a slot s<96> in the outer plunger f<21>. The member s<94> is lifted to bring the thread into the needle eye by a rud actuated from the main cam. In operation, the needle is advanced through openings in the plungers #<21@>, the eye is opened and the thread inserted and the needle is withdrawn, pulling thread irom the bobbin over the sheaves s<82>. At the end of its backward stroke, the guide s<3> is shifted and the needle in moving forward again leaves a loop of thread round a retaining hook s<104>, Figs. 26 and 29, while a loop left from the preceding stitch slips off and is drawn tight against the mattress. At the second advance, the needle enters the shuttle housing and as its eye is opened the thread is caught by a hook s<107>, Fig. 19, and passed round the shuttle, the loop caught on the sheaves s<82> being given up by the counter clockwise rotation of the disc s<78>. when the thread is engaged by the shuttle hook and withdrawn from the needle, the limb which is not engaged is caught in a notch s<109> and held while the hook completes its rotation. As it does so, the take-up s<78> is again rotated clockwise to take up the slack loop and the needle has been so far withdrawn as to allow the loop retained on the hook s<104> to slip off so that both loops are drawn up and the stitch completed; the sheave s<48> is at this time locked to prevent the withdrawal of thread from the bobbin. A bobbinshifting device is provided to allow the thread to slip past the projections which retain the bobbin against rotation and this comprises a rod s<112>, Fig. 14, operated by a linkage from the cam mechanism. After the forming of the stitch, the shuttle s<36> is rotated in clockwise direction to normal starting position and the disc s<78> is rotated to draw the stitch tight. The machine is moved along the side of the table 2 between stitching operations by a gear wheel d<1> meshing with a rack d<2> and driven by a pinion elongated to allow vertical adjustment and connected by a flexible joint to a shaft d<6>, Fig. 35. The shaft, d<6> is supported from a shaft d<9> by a, bearing d<8> and is driven by a bevel gear d<7>, d<11>. the gear wheel d<11> being secured to a driving disc d<12>. The. disc d<12> has a series of notches which are engaged by a pawl d<16> mounted on an oscillating arm d<13> fast on the shaft. d<9>. Gear wheels d<18>. d<19> are alternatively coupled with the shaft d<9> by a sliding feather device and are actuated by a reciprocating rack carried by a slide d<29> which slidably engages a block d<32> mounted on the shaft 22. The slide d<29> is reciprocated by a cam 28. The pawl is moved into and out of engagement with the notches in the disc d<12> by an oscillating member d<3@> actuated by the cam 28 and having cam surfaces d<39>, d<41> which engage a roller d<42> on the pawl. Long or short stitches are obtained by locking either the wheel d<18> or the wheel d<19> to the shaft. A locking pin is provided to prevent the machine being carried too far by its momentum. A clutch is provided to allow the intermittent driving mechanism to be disconnected. The machine is actuated by a motor 31 belt-geared to a sleeve 34, Fig. 37, rotatable on a shaft 36 on which a bevel gear 44, Figs. 37 and 39, is fixed. The gear 44 meshes with a gear 46 on a sleeve 47 splined on a shaft 48 geared to a shaft 51, on which is a gear meshing with teeth 56 on the periphery of the main cam. The shaft 36 is normally driven from the sleeve 34 through a clutch bodv 43 feathered on the shaft and engaged with the end of the sleeve through clutch surfaces 57, 58. When speed is to be reduced in rounding the corners of the table, the clutch is shifted automatically to engage a clutch surface 62 on a sleeve carrying a gear wheel 38. The drive is then through a gear wheel 37 on the sleeve 34, gear wheels 39, 41, the gear wheel 38. and the clutch body 43. In order to ensure the change from one gear to the other without any cessation in movement, the clutch surface 61 which engages the surface 62 is formed on a block 59 which is slidably held by a spring 63 in the hollow clutch body. The shift of the clutch at the corners of the table is effected bv a lever 64. 68 the end of which lies in the field of movement of a rod 69 mounted on the forward castor of the machine and is engaged thereby when the castor swivels in rounding the corner of the table. In order to counteract the tendency of the mattress to be dragged along by the stitching thread. a shaper f<10>, Figs. 1 and 4, for the roll is provided with a slidable yoke 73. having rearwardly directed teeth, which is moved oppositely to the direction of the machine bv an arm 74 connected to the yoke by a link and having a curved cam arm 77 which is engaged by a roller on the extension 81 of the arm d<13> carrying the pawl d<16>. Specification 189,278 is referred to.