Patent GB-399222-A (GB)
Title: Apparatus for attaching metal strip to sheets of wood, composition boarding, or the like
IPC: B01D1/18
Filed: 1932-04-02
Abstract: 399,222. Nailing. KAMPER, A. M., 182, Ewell Road, Surbiton, Surrey. April 2, 1932, Nos. 9524 and 18295. [Class 89 (iii).] An apparatus for attaching a metal strip to a sheet of wood, composition boarding, &c, by causing parts of the metal strip to penetrate the wood &c. applied, in the example described, to the assembling of a container, such as a box, packing case, crate, or drum, comprises a series of feed rollers for drawing channel metal strips into the machine and feeding them between rolling-in rollers which secure them to the boards, a plurality of endless chain conveyers for transferring the boards in sequence from a pair of board hoppers to the rolling-in rollers, movable stops controlling the admission of boards and channel strips to the rolling-in rollers, and, associated therewith, guide and auxiliary pressure rollers which maintain the boards and channel strips in desired relationship as they are fed between the rolling-in rollers. The apparatus includes a fixed framework, comprising sides 1, 2 and ends 3, 4, Figs. 1 and 2. Adjacent the side 2 is fitted an inner side 5 slidable transversely on rods 7 by screws 6, the means for feeding in the strips being mounted on members 1, 5 respectively so that the gauge between pairs of strips can be adjusted. Strip feeding. Strip is fed into the machine by a first series of feed rollers 8 .. 11, Figs. 1 and 2, mounted adjacent the movable frame 5, and 8b .. 11b, mounted adjacent the frame side member 1, the first three pairs of rollers being mounted on transverse shafts 81, 9<1>, 101 carried in bosses 16a, 16b, 17a, 17b, 18a, 18b in the fixed side frames and in bosses 16, 17, 18 in the movable frame 5, while rollers 11, 11b are keyed to a shaft 111 journalled in bearings 19a, 19, 19b. The rollers 8 .. 11 can slide on their shafts so that they remain a fixed distance from the movable frame 5. The strips are held on these rollers by loaded idler wheels 12 journalled on radius rods 12<1> pivoted on pins 12<11> fixed to frame members, these idler wheels engaging inside the channel of the strip. The rollers 8 .. 11 and 8b .. 11b are chain driven from the rollers 11, 11b. From these rollers the strips pass to a second series of feed rollers 29, 30, 31 and 29b, 30b, 31b on shafts 291, 301, 31<1>. Rollers 30, 31 are chain driven from roller 29 which is fixed to a sprocket 46 journalled on a sleeve 40 keyed on the shaft 29<1> so that it forms one element of a clutch, the arrangement being that shaft 29<1> is journalled at 42 in the movable frame 5 and retained by lock nuts 43, a spring 44 compressed between lock nuts 45 secured to the sleeve 40 and the side of sprocket 46 serving to urge roller 29 into frictional engagement with a shoulder on sleeve 40. The sprocket and roller thus normally rotate with shaft 29<1> but can override when the resistance exceeds a predetermined amount. Roller 29b is driven through a similar clutch. Shaft 29<1> carries sprockets 62, 63 geared to shaft 11<1> and to a driving shaft 60 from which the machine is actuated. Rollers 29, 30, 31 are chain geared together. Rollers 29b, 30b, 31b are similarly arranged. Each clutch driven roller co-operates with a spring-loaded wheel 52. Panel-board feeding. A hopper 70, Figs. 1 and 19, containing front and back panel boards is mounted on standards 71b secured on the members 2, 1 and united by rods 72, 73, a standard 71, Fig. 3, sliding on rods 72, 73 and mounted on the movable member 5 serving as further support. Rods 76b with spring-pivoted lower ends 77b project down across the front of the hopper, and are vertically adjustable to allow boards of varying thickness to be fed beneath the spring rods 77b. A second similar hopper 70<1> is provided for lid and bottom panels. The boards are transferred by four pairs of conveyers, one chain of each pair being adjacent the movable frame 5 and the second adjacent the fixed frame 1. Conveyers 82, 82b, 84, 84b, Fig. 3, are driven by a shaft 86 connected by sprocket 96 and chain 97 to a sprocket 98 on the driving shaft 60, the actuation from shaft 86 being by means of a sleeve 95, Fig. 22, slidably keyed on the shaft 86 and journalled on a bearing 88 on the slidable frame 5, friction discs 102, 103 and sprockets 90, 92 being held pressed against the end 94 of sleeve 95 so that the chains 82, 84 may slip if the load exceeds a predetermined amount. Conveyers 83, 83b, 85, 85b are driven by a shaft 87 connected by sprocket 99 and chain 100 to a sprocket 101 on the driving shaft 60, the drive from shaft 87 to chains 83, 85 being through a slidable clutch similar to that described with reference to shaft 86. A pair of uniformly spaced dogs 82<1>, 83<1>, Fig. 19, is attached to each conveyer chain which withdraws boards from the hoppers and slide them along troughs into rolling-in rollers, boards from hopper 70 passing beneath those of hopper 70<1> which are raised by a spring rail 80b, the boards when free from the hoppers being pressed by spring rails 32b. Admission of boards and strips to rolling in rollers. The leading board and the strips are stopped by three stops 139, Fig. 7, mounted on a shaft 135 forming part of a stop mechanism. This mechanism is actuated from a shaft 115 journalled in the frame and connected by a chain 117, Fig. 2, and sprockets 116, 118 to shaft 29<1>, sprocket 116 forming the driving element of a clutch, the hub 116<1>, Fig. 9, of sprocket 116 being journalled on a sleeve 190 keyed to shaft 115 and having a flanged end 1901. A semicircular keyway 191 in sleeve 190 houses a rotatable key 192 integral with a projecting arm 193 and journalled in flange 190<1>. Arm 193 is urged clockwise by a spring 194, housed in the flange 190<1>. Recesses 195 in the bore of hub 1161 are arranged so that when key 192 is opposite a recess 195, the key is rotated by Spring 194 so that a shoulder 1921 engages a recess and locks the sleeve to the sprocket, so that the shaft 115 is then positively driven. If arm 193 meets an obstruction it is rotated so as to displace key 192 so that sleeve 190 and shaft 115 may stop while hub 1161 continues to rotate. Arm 193 can be engaged by either of two bell cranks 120, 122, Fig. 7, connected by a link 124. A casting 141, Figs. 6 and 7, bolted to the frame 1 and supporting shaft 135 carries two slides 142, 143, of which the upper 142 carries a pin 144 on which is journalled a flanged auxiliary pressure roller 145 adapted to bear on the upper side of a board B. The lower slide 143 carries a pin 146 on which is journalled a grooved auxiliary pressure roller 147 adapted to locate a strip S in the transverse direction. Eccentrics 148, 149, Fig. 6, keyed to shaft 115 and connected to pins 144, 146 by rods 150, 151, cause rollers 145, 147 to be far enough apart to allow a board B to be placed between them when bell crank 120 is in contact with arm 193. When shaft 115 turns through 180 the rollers approach and force the board into engagement with the strip. Similar rollers are situated on the other side of the machine. An insulated contact 155, Fig. 7, on the casting 141 co-operates with a movable contact 156 on an arm 157 pivoted on a pin 158 on the casting 141, the arm 157 engaging the upper surface of the board when in position between the rollers, thus keeping the contacts open, while when no board is there the arm 157 drops and closes the contacts 155, 156. A relay switch 129 controls a solenoid 125 which controls the bell cranks 120, 121. The edge of the board is positioned laterally by a pair of sliding bolts 162, Fig. 12, carrying a guide rail 164 and actuated from a shaft 165 by a handle 166 so that the width of the groove between the board and the outer limit of the U -strip can be varied. The other lateral edge of the board is similarly positioned. The rolling-in rollers 186, 186<1>, Figs. 2 and 15, are mounted in housings 170, 170b, on the frame members 5, 1, and are driven from a shaft 171 through a sprocket 172 and chain 173 from the main driving shaft 60. Shaft 171 is slidably keyed to a gear wheel 175 meshing with a pinion 176 on a shaft 177 keyed to a wheel 178 which bends over the points of the teeth after they have been forced through the board. Pinion 176 meshes with an idler wheel 179 carried by a shaft 180, shafts 177, 180 being journalled in a slide 181, which is urged downwards by springs 182. The idler 179 meshes with a gear 183 fixed on a shaft 184 journalled in a spring-loaded slide 185 and carrying the upper rolling-in roller 186. The lower rolling-in roller 186 is rigid with a gear 183<1> actuated from gear 175 through gears 1751, 1761, 1791 183<1> journalled direct in the housing gear 186<1> being fixed to a shaft 177<1> carrying a wheel co-operating with wheel 178. The upper roller has a groove to give clearance to the points of the strip teeth and the peripheral speed of the rollers and tooth-bending wheels is lower than the linear speed of the conveyers and the peripheral speed of the strip-feeding rollers. When the leading board and the strips have all reached the stops 139 the circuit through contacts 152<1>, Fig. 10, carried by the stops is completed, and cam 127 holding a switch 128 closed, the relay switch 189 is energized, and this energizes solenoid 125. Bell crank 120 is then withdrawn from contact with arm 193 and shaft 115 begins to rotate clockwise drawing the auxiliary rollers together and forcing the strip teeth partly into the leading board. The rotation of cam 127 opens switch 128 and de-energizes solenoid 125 so that bell crank 122 moves back into the path of arm 193 and stops shaft 115 after it has turned through 180. Cam 127 now closes two switches 129, 129<1> completing the circuit of a solenoid 138, Fig. 7, which withdraws a tooth 137 and permits stop shaft 135 to be rotated by the pressure of the strips which are then fed forward to the rolling-in rollers. The speed of the rolling-in rollers is such that the conveyer clutches slip and keeps the succeeding boards