Patent GB-108720-A (GB)
Title: Improvements in or relating to Machines for Marking Buttonhole, Button or other Fastener Locations on Boot or Shoe Uppers.
IPC: A43D8/26
Filed: 1916-08-17
Abstract: 108,720. British United Shoe Machinery Co., (United Shoe Machinery Co.). Aug. 17, 1916. Marking work for sewing.-A machine for marking buttonhole, button, or other fastener locations on parts of boot and shoe appers is provided with a series of relatively-adjustable marking members which effect marking by heating the material locally to cauterization; preferably, the marking is effected by a series of pairs of opposed electrically heated elements formed to produce by cauterization a series of relatively short thin lines upon the opposite sides of the work. The invention is described with reference tc a machine of the type described in' Specification 19857/14. The marking elements are carried by a series of relatively adjustable pairs of arms 60, 78, Fig. 4, normally separated at their forwarc. ends by a spring 82 and adapted to be closed together to effect marking by a head 6, Fig. 1, actuated from a shaft 8, which is driven by gearing including a one-revolution clutch from a continuously running counter shaft 30 conveniently driven from a motor 36. The rear of the lower arm 60 of each pair is mounted on a base 62, Fig 4, rising from a channelled plate 64 engaging a flanged stud 54 on a curved raised surface 56 of the machine bed 2, while the forward end of the arm is carried in a frame 66 resting on a concentrically curved raised surface of the bed 2 and carrying an adjustable stop 68 to limit the approach of the arms 60. 78. The frame 66 is formed w th a rib 70 carrying a wire guard 72 for the upper marking element, and at its forward end supports, adjustably a post 74 to which is pivoted a combined work-supporting table and guard 76. This table is apertured in line with the lower marking element and is forked at its rear end to bridge the rib 70 and locsely engaged spaced legs 92 depending from the upper arm 78, which is mounted at its rear end in a bracket 80 pivoted to the base 62; certain of the tables 76 carry adjustable angle plates 96 to provide edge gauges for the work. Each arm 60. 78 comprises a hollow tube closed at its rear end hy a flanged insulating plug 100, which is bored to receive a threaded sleeve 102, through which extends a conductor rod 104, and is recessed on its rear face to receive a connector clip 106 on an insulated wire 108 extending from the rear end of the lower arm 60 of the next adjacent marker element. The clip bridges the rod 104 and is held in contact with the sleeve 102 and the rod by an insulating cap 110 carrying a threaded sleeve 112 which screws over the end of the rod. An insulated wire 114 extends through a bore in the plug 100 opposite the clip and leads the current from the upper to the lower arm. The forward end of the tube 78 is closed by a flanged insulating plug 116 which is recessed on its outer face to receive a contact ring 118, to which the wire 114 is electrically connected. The plug is bored centrally to receive and clear the forward end of the rod 104, which, preferably after passing through an insulating washer 119 mounted within the ring 118, paeses through a burner plug 120 of insulating material and is then engaged by a contact sleeve 128 carried by an insulating nut 130. The plug 120 is positioned by a dowel pin extending from the plug 116 and its opposite faces are recessed to receive detachable contact plates 122, 124 carrying a loop 126 of relatively fine resistance wire. The rod 104 passes through these plates with clearance, but when the nut 130 is tightened the rod is connected electrically through its sleeve 128 with the outer plate 122, so that the current will flow through the wire 126 to the plate 124 and so through the ring 118 and wire 114 to the next pair of marking elements, which are thus all connected in series. The wire loops 126 are maintained at a uniform minimum heat when not marking, and this heat. is increased automatically during marking to compensate for the loss of heat due to the burning action. For this purpose the markers are included in a circuit containing a rheostat having adjustable resistance, with a shunt circuit including connexions to a resistance cut-out on the rheostat and a switch normally open to break this shunt circuit but automatically closed by the operation of the machine for marking. The rheostat comprises a casing 144 containing a ribbon 147, spirally wound with interposed insulating material, such as mica, and arranged between, but insulated from, an upper and lower series of spaced grid bars 146. Between and above the upper grid bars is arranged a rock shaft 168 the journals 170 of which are carried by, but insulated from, lead spring arms 172 supported by the grid bars .and normally acting to press the shaft towards the ribbon 147. The shaft has mounted on it sleeves 174 carrying complemental spiral contact ribs 176, the shaft being rotated to vary the points of contact by gearing actuated by turning a knob on a spindle 184, Figs. 6 and 7, extending through the top of the casing 144; preferably, a pointer 188 moving over a dial 190 indicates the amount of the resistance. cut out when the shaft is adjusted to predetermine the minimum heat for the wire loops 126. A second stud shaft 192 is similarly supported, from a grid bar 146 and carries near is outer end a, sleeve 198 having a spiral rib 202 to contact with the outer coils of the ribbon 147 ; this shaft is adapted to be rotated by gearing actuated by turning a knob on a spindle 208, which carries a pointer 212, Fig. 7, moving over a dial plate 214. The casing 144 is provided at .one side with service terminals 150, 152, Fig. 6 and at the opposite sides with heating circuit terminals 154, 156, 158. 160. The terminals 150, 154 are directly connected by a wire 162, while the outer end 164 of the ribbon is connected by a wire 166 to the outlet terminal 156. The terminal 158 is connected with the inner end of the sleeve 198 by a wire 200 secured to the inner spring-supported journal of the shaft 192. The second service terminal 152 is connected by a wire 216 to the inner end of the ribbon 147, and adjacent to this point of connexion wires 218 connect the wire 216 to the spring-supported journals 170 of the shaft 168. When the motor 36, Fig. 1, is used to drive the shaft 30 the wire 216 is also extended across the rheostat to the terminal 160. Fig. 8 indicates the connexions diagrammatically, the motor and heating circuits being shown in light and heavy lines respectively. The automatic switch previously referred to is included in the shunt circuit with the spiral rib 202 and the terminal 158. It comprises spaced insulated metal disks 220, Figs. 1 and 8, carried by the shafs 8 and cut away on their peripheries to form an air gap 222, and four spaced contact fingers 224, which are mounted on an insulating block on the machine bed 2 and extend over and normally tend to engage the disks. The inner fingers are connected by a bridge piece 226, the right end finger, Fig. 8, is connected by a wire 228 with the termiral 158, and the lefthand finger is connected by a wire 230 in shunt with the main heating circuit. When the machine is at rest the fingers 224 extend into the air gap 222, and the current passes from the service 'terminal 152 through the wire 216 to the contact point of the spiral rib 176, and from there through the outer end of the ribbon 147 and the wire 166 to the terminal 156; from there it passes through the marking elements and back to the terminal 154 and so bv way of the wire 162 to the other service terminal 150. When the machine is started the fingers 224 immediately engage the disks 200 and the current new leaves the rheostat by way of the contact point of the spiral rib 202 with the ribbon, then through the wire 200 to the terminal 158 ; from this by the wire 228 to the end finger 224, then through the switch and the wire 230 to the marking elements and back to the terminal 154 and so to the service terminal 150. The circuit through the switch is closed prior to marking, and is broken again after marking and before the shaft 8 is arrested.