Patent GB-484344-A (GB)
Title: Pouncing machine
IPC: A42C1/08
Filed: 1937-03-12
Abstract: 484,344. Hats &c. DORAN BROS., Inc. March 12, 1937, No. 7333. Convention date, June 22, 1936. [Class 63] A machine for pouncing or finishing hat bodies is characterized by a reciprocable pad over which an abrasive strip may be automatically fed, the reciprocation of the pad being effected by finely balanced mechanism within the tool support driven by a motor mounted therein, thus damping vibration. The hat support is very similar to that described in Specification 462,413 in which hydraulic mechanism effects relative movement between the tool and hat supports. The machine comprises a column 10, Fig. 1, a motor housing 12 and a head 13 on which a hat body 16 is mounted. A shaft 13a and chuck 14 are adjustable for blocks of different depths as described in the above Specification. The shaft 13 is driven by a clutch 20 from a motor 21 which also drives an oil pump 22 by belt and pulleys, 23, 24. The pump 22 supplies pressure oil to an hydraulic piston in a cylinder 35. A rod 60 is connected to a rack 62 which operates a stud 64 carrying the pouncing mechanism. A collar 65 is secured to the stud 64 so as to be rotatable therewith and carries a bracket 65a with arms 65b. A resilient strip 235 is secured to each arm with extensions 67b carrying a member on which the pouncing tool assembly 27 becomes resiliently mounted. The assembly is secured to a support 238 and pivotal movement about the pin 66 causes movement towards and away from the hatblock. Mounted on a shaft 74, Fig. 4, is a main crank disc 78 and smaller side discs 79, 80 driven by a motor 87. Balancing rods 100, 101, preferably of bronze are connected to the outer discs. A rod 102 for reciprocating the pouncing tool is connected to the central disc. The rod 102 is preferably hollow and made of 97¢ per cent magnesium with 2¢ per cent aluminium, and coated with hard steel within bushings so as to stand hard wear. A pad supporting rod 109 is mounted in ballbearings 110, 111 to facilitate swivelling of a pad frame 115. A paper roll support 27c is mounted on a ball-bearing 113 and carries a pin 120 supporting a roll of sand-paper 121 which is held by a blade 125 from too ready unrolling. Sand-paper passes over rollers 129, 134, 135 and is yieldingly clamped by a spring 137 against a guide strip 140. The sand-paper passes over a guide 141 to a pouncing pad 142 preferably of sponge rubber and thence to toothed feed drums 144, 145 suitably driven. The pressure of the pouncing tool needs to be varied during travel and for this purpose an arm 146, Fig. 1, is rotatably mounted on a roller 147. A cam 149 is adjustably secured to the top of a housing 26a. On a bracket 151 is mounted a leaf spring 152 permitting the tool assembly to pivot towards the hat body. When the roller 147 rides up the cam 149 the arm 146 is pivoted counterclockwise tensioning the spring 152 and causing the tool to pivot away from the hat body. Preferably the cam 149 is so designed that after the tool passes the apex of the hat body upon its return stroke the arm 146 is pivoted upwardly at a faster rate so as to remove the tool from the hat body. In order to urge the pad into contact with the ha,t body there is a coiled spring 153, Fig. 2, preferably disposed in a drum 154 to which it is anchored and to a supporting pin 66. To effect the pressure of the pad against the hat body a rod 155, Fig. 1, threaded at 155a is mounted in a bracket 156 with a portion borne in a spring supporting bracket 151. A hand wheel 157 is disposed between the hub of this wheel and bracket 151. The spring 159 forces the cup 158 against the hub 157 constituting a friction brake. A pointer 161 registers the value of the spring 152. By manipulating the wheel 157 a nut 160 is moved to vary the effective pressure of tension relief spring 152. Upon manipulation of a hand wheel 164 a drum 154 tensions a coil spring 153, the tension being shown on a scale 167. By setting wheels 157, 164 an accurate judgment of the pressure of the pad is obtained. The tool assembly 27 is given rotary motion by an hydraulic cylinder 35. The oil pump 22 has an intake from a reservoir (not shown)..An oil outlet pipe 29, Fig. 1, is connected to a metering valve 30. A direction control valve 31 is connected to the valve 30 by a pipe 32 and pipes 33, 34 connect with opposite ends of cylinder 35. An exhaust 36 connects with the oil reservoir. A relief valve 38 connects by a pipe 39 to the reservoir. The control valve 31 has therein a plunger moved vertically by a rod 40 actuated by a hand lever 41 pivotally mounted on a housing 12. Lever 41, conveniently a bell-crank, is returnable by a spring 46. Oil under pressure is directed through pipe 34 to left end of cylinder 35 causing left to right movement of rack 62. An adjustable abutment 168 on rod 60 engages one end 169a of a bell-crank 169 causing upward movement of the arm 169b and reversing rod 170. At the end of the stroke of the rod 60, the rod 170 is raised to engage lever 47 so as to disengage detent from shoulder 40a of plunger 40. A spring (not shown) in reversing valve 31 forces valve plunger upwardly to change direction of oil flow, causing reverse movement of rack 62 and tool assembly. To assure earlier reverse, a hand lever 172 secured to a bell-crank 173 is pivotally mounted on the upper part of section 11 so as to engage lever 47 and cause reverse of oil flow. Rate of feed of the pouncing tool is secured by a cam 174 on the rack 62. A roller 175 on an arm 169a of lever 169 causes pivoting according to contour of the cam. A dial 50, Fig. 7, has a speed adjusting screw 51 with a head 51a. A pointer 52 indicates the position of the head. Fluid under pressure flows through pipe 29 into chamber 30a of metering valve. An outlet port 30b is provided with a spring actuated piston 53 which has a tapered groove 53a and a stem 53b abutting a push rod 54. The outer end of push rod 54 is adjacent head 51a of screw 51, and accordingly the head 51a abuts the end of rod 54 sooner or later during the pivoting of the bell-crank 169. Thus it is possible to provide a dwell at the end of the forward feeding motion of the pouncing tool as the valve 30 can be substantially closed. Also depending on the position of the cam 174 and lever 169, the orifice in the metering valve can be set to effect the feed rate of the tool. In order to assist in balancing the oscillation of the tool, the roll of sand-paper 121, Fig. 4, is mounted stationary from the pad frame. Lubrication is by splash from the bottom of the crank case 27a. To effect a regular feed of sand-paper there is an operating rod 177, Figs. 1 and 5, secured to one end of a stud 66. The lower end of the feed rod has a cam piece 179, Fig. 5. A spring 183 constantly urges guide sleeve 182 upwardly against a collar 181. On the left of the shaft 185 there is a pawl lifting arm 188 with a roller 189 mounted thereon. A slot 190, Fig. 2, is preferably formed in the paper roll support and in this slot is a slidng arm 191 with a shoe 192. A cover plate 193 holds the sliding arm in assembled position. When the arm 191 is forced upwardly, a ratchet wheel 198 is rotated clockwise, one notch per engagement. Ratchet wheel 198 is mounted on a shaft 199, Fig. 5, bearing a pinion 200 connected to one end of a toothed feed drum 144. Every time rod 177 is pushed upwardly sand-paper is fed from roll 121. To stop rotation of hat block 15, Fig. 2, and reciprocation of the pad, a shut off mechanism comprises a shaft 204 and lever 205. A rod 210 is secured at one end to the lever 205 and at the other to a bell-crank 211 operating a rod 212 connected to lever arms 214, 215 and so to a clutch rod 218 operating the clutch 20. The rod 224 is connected by bell-crank 225 to an operating lever 226. The bell-crank is secured to one end of a shaft 42 pivotally mounted in the motor housing 12, and has at its other end a dog 42a, Fig. 1, extending inwardly under the arm 41a of a bell-crank lever. Thus movement of the lever 41, Fig. 1, to the right will cause arm 41a to engage dog 42a, and through shaft 42 the lever 225, Fig. 2, will move in unison. The lever 226 can be operated independently to rotate the hat without engaging the pad when it is required to dust the hat after pouncing. Pivotally secured to the rod 224 is a rod 228 for operating a mercury switch 229 preferably hooked up in series with a main switch 230 to the motor 87. Thus circuit may be broken by moving switch arm 228. It is desirable to cause feeding of pouncing paper only once during one cycle of operation.