Patent GB-191020885-A (GB)
Title: Improvements in Machines for Rounding or Trimming Boot and Shoe Outer Soles or for other purposes.
Inventor: DENNE MARK THOMAS
IPC: A43D27/00
Filed: 1910-09-07
Granted: 1911-12-07
Abstract: 20,885. Denne, M. F. Sept. 7. Boot - sole sewing machines; fair - stitching; feed.-Relates to sewing and other machines of the type in which there is relative movement between the tool and work in a direction transverse or angular to the line of work feed at a speed which changes from X to Y when operating on one piece of work, and from Y to X when operating on the next piece of work, such reversal being effected by an automatic adjustment of the mechanism which controls the speed of relative transverse or other movement. Fig. 11 shows a diagrammatic view of the invention as applied to a machine for trimming the soles of lasted shoes to a " Baltimore " edge. The shoe is held with its crease in engagement with a guide G, which is raised or lowered to move the work in a direction transverse to the normal feed line F by a cam C adapted to be rotated in opposite directions at different speeds. The direction of rotation of the cam is determined by the movement of a knee-lever K to the right or left of its normal position, such movement being limited by adjustable stops S, S<1>. Assuming that a left boot M is being trimmed, the trimming operation commences at the point i, and, when the point e is reached, the operator moves the knee-lever over to the left as far as the stop S, causing the cam C to rotate in the direction a at such a speed that the guide G receives a quick downward movement, with the result that there is a quick increase in the width of the sole extension. When the point E is reached, the operator moves the knee-lever to the right as far as the stop S', with the result that the cam is reversed and driven at a lower speed in the direction b, causing the guide G to rise at such a rate that a gradual decrease in the sole extension is pro-, duced. When the point e<1> has been reached, the knee-lever K is returned to its normal position, and the remainder of the sole is trimmed to a predetermined minimum width. Meanwhile, however, the positions of the stops S, S<1> have automatically been interchanged, the new positions being indicated at S<3>, S<4> so that, when thÚ right boot M<1> is trimmed, movement of the knee-lever to the left causes the cam to be rotated, first at its slower speed, to give a gradual increase in the sole extension to the point E, and, when the knee-lever is moved to the right, the cam is reversed and rotated at its higher speed, to give a quick decrease in the sole extension from E to e. If desired, any width of the sole extension up to the limit of the stops S, S<1> may be produced by manipulating the knee-lever K. The invention is described in detail as applied to a rough-rounding and channelling machine of the type described in Specification 29,108/04, [Class 17, Boots &c.], the usual movements being imparted to the trimming-knife 10, Fig. 1, channelling-knife 13, feed-roll 14, and cutting-block 11 from cams on the main shaft 1. The crease-guide 12 is carried by vertically - slidable rods 15 connected by a cross-bar 18, which is held by a spring 18<a> in contact with a cam groove in a disk 17; the groove extends from a shoulder 17<a>, Fig. 3, to a point 17b, but the amount operative can be varied by an adjustable stop 19. The disk 17 is mounted on a sleeve-like projection of a ratchet-wheel 21, from which it is driven frictionally so that it may be stopped without interfering with the rotation of the ratchet-wheel. This ratchet-wheel is adapted to be engaged and actuated by one or other of pawl teeth on a block 24, pivotally carried by a lever 23 loosely mounted on the spindle 22 of the ratchet - wheel. The lever 23, Fig. 1, is slotted to receive a crank-pin 25 formed on a block 31<a>, which is furnished with a tongue 30 engaging a diametrical slot in the end of the shaft 1. The block 31<a> is fixed to a slide 26 located between guides on a disk 27, Figs. 1 and 7, which is furnished with a hub 27<a> rotatably mounted in a horizontal slide 28. By moving the slide 28, the amount of throw of the pawl - carrying lever 23, and consequently the speed of the ratchet-wheel 21 and cam-disk 17 is varied. To move the slide 28, it is formed with rack teeth 28<a> in gear with a toothed segment 28<c>, Fig. 2, forming part of an arm 31 pivoted about a stud 29<a>, and adapted to be actuated through a rod 31<b> by a knee-lever &c. A lever 33, Fig. 3, fixed to the stud 29<a> is formed with an arm 33<a> carrying a roll 34, which rides in a groove in the back of the pawl block 24, so that, as the arm 31 is actuated to move the slide 28 to the right or left to vary the speed of the cam disk 17, so the corresponding pawl is moved into engagement with the ratchet-wheel 21 to change the direction of rotation of the cam disk. The up and down movements of the arm are limited by the contact of its pivotal connexion 31* with the rod 31<b> with stops 36, 37 adjustably mounted on a friction slide 38 movable across a disk 39, which is adapted to be driven frictionally by gearing 70, 70<a>, 70<b> from the cam shaft 1. The disk is normally held stationary by a spring - pressed plunger 40 adapted to engage one or other of diametricallyopposite notches 41, 41<a> in the disk, the arrangement being such that the disk is not released until the pivot 31* has engaged both the stops 36, 37 in turn; after it has engaged the stop 37, the slide 38 releases the plunger 40, and the disk 39 rotates through half a revolution to interchange the positions of the stops, and is again locked. The slide 38 is provided with indicators, Fig. 2, to show for which boot the machine is set, and, if desired, with a scale of sizes. The Specification also describes means of actuating the knives, and a method of feeding the work, which are similar to those described in the above-mentioned Specification.