Patent GB-190821815-A (GB)
Title: Improvements in and relating to Blindstitch Felling Machines.
Inventor: ARBETTER WOLF
Filed: 1908-10-15
Granted: 1909-01-07
Abstract: 21,815. Arbetter, W. June 2, [date applied for under Section 91 of Patents &c. Act, 1907]. Blind-stitching machines; feed; presser-feet; work-supports.-Relates to a machine for felling with blind stitches, of the general type described in Specification No. 19,080, A.D. 1906, and consists essentially in the provision of an above-work feeding- point acting to feed the upper ply positively and so compensate for the irregular retarding action of the presser-foot. The work is held up to an unyielding presser-foot D, fixed to the machine frame, by an upwardlypressed work-support E, E<5> sliding in vertical guides. The feed-dog F slides horizontally upon a vertical slide F<5> which moves in guides formed in the work-support frame E<5>. The slide F<5> is moved up and down by a cam F<10> on a shaft mounted in the worksupport frame and driven from a lower driving shaft mounted in the fixed machine frame, by an intermediate wobbler-shaft. The feed-dog is moved horizontally relatively to the slide F<5> by a lever H<3> connected to the dog by a long link H. The levershaft H<4> is operated from a cam on the lower driving-shaft through a slotted lever and pitman. The feeding-point P is integral with a stock P<2> which slides in vertical guides in an horizontal slide P<3>. It is moved vertically by a cam P<7> which rotates between ears P<6> on the stock, and the slide P<3> is moved horizontally in one direction by a spring P<18> and in the other by a cam P<13>. The cams P<7>, P<13> are carried by a shaft P<8> which is rocked by the rod P<16>. The upper end of this rod embraces an eccentric on the shaft A and a pin on the lower end works in a slot in the lever <p15>. A fixed pin P<18> enters a slot in the rod to form a sliding and rocking fulcrum. The eccentric is normally coupled by two pins P<31>, P<32> to a sleeve P<25> splined to the shaft A. To throw the feeding- point out of gear, the sleeve is moved to-the left by the forked lever P<28>, and it can then be retained in its highest position by a pin <p40> which is moved downwards to enter a bole P<41> in the eccentric strap. Underneath that portion of the work engaged by the feeding-point is a small smooth pressing-surface R attached to the feed-dog and pressed upwards by a leaf-spring R<2>. The presserfoot, Fig. 9, is bevelled at D<13> to permit the feeding-point to crowd the upper ply of fabric beneath the presser-foot. The bender stock L<2> is slidingly mounted in lugs L<3> on a fixed plate E<80>, which also serves to hold the work-support in its guides. It is moved upwards to bend the work at every alternate stitch by a lever L<5> which is rocked by a lever on the same shaft L<6>. The shaft carries also a third lever, and a spring acting on the end of this holds the second mentioned lever in contact with a suitable cam on the end of a shaft which makes one revolution for two reciprocations of the needle. The presser-foot carries at its heel portion the guide D' for the edge of the upper ply, and the part which presses upon the upper ply has a bevelled extension D<12>. Needle-driving.-The needle spindle is mounted in a swivelling bracket B<8> and is driven as described in the above-mentioned Specification. The bracket B<8> and its vertical trunnion B<10> are oscillated by connexion with a lever T' operated by a cam C<4>. The lever T' is slotted and carries a sliding piece on which a pin T<4> is projected into a slot in the lever fixed to the trunnion B<10>. To vary the amplitude of the oscillation, the sliding piece is moved in its slot by a screw.