US2781516A - Strapping machine - Google Patents

Strapping machine Download PDF

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US2781516A
US2781516A US452556A US45255654A US2781516A US 2781516 A US2781516 A US 2781516A US 452556 A US452556 A US 452556A US 45255654 A US45255654 A US 45255654A US 2781516 A US2781516 A US 2781516A
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strap
nailing
strapping
microswitch
air
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US452556A
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Morris M Eisenberg
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/34—Manufacture or reconditioning of specific semi-finished or finished articles of cases, trunks, or boxes, of wood or equivalent material which cannot satisfactorily be bent without softening ; Manufacture of cleats therefor
    • B27M3/36—Machines or devices for attaching blanks together, e.g. for making wire-bound boxes

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  • This invention relates to a machine for strapping boxes and more particularly to a machine for automatically applying and nailing metal strapping to a box.
  • Still other machines were designed for nailing metal strapping around the ends of boxes, but these machines utilized the nails not so much to fasten the overlapped ends of the strapping together as to fasten the strapping to the boxes on all sides thereof. No provision was made for automatically feeding the strapping completely around 'the box and the entire operation was manual in the sense that the operator had to place the box on one edge, actuate the nailing mechanism, turn the box to a second edge, actuate the nailing mechanism, and so on until the operator completely rotated the box and nailed strapping to each edge thereof.
  • a simple and inexpensive means for converting a standard nailing machine into a machine for applying and nailing strapping to boxes is utilized in conjunction with a reversible source of motive power which may be stalled without any deleterious 2,781,516 Patented Feb. 19, 1957 eects and without excessive consumption of power.
  • This combination makes it possible to eliminate the complicated and complex multi-wheel drive and clutching arrangements of previous machines and makes possible a simple and inexpensive guide means for the strapping.
  • the strap is fed completely about the box, the free end thereof is held by an extremely simple holding mechanism, the strap is tensioned and then nailed at the overlapped portion only in an entirely automatic sequence. Complicated strap tensioning arrangements are avoided and the operating table and nailing mechanism are provided by the existent standard nailing machine.
  • lt is another object of this invention to provide a means for feeding strap around a box and then tensioning such strap by means of the same prime mover, which may be stalled without -damage thereto and without excessive power consumption.
  • Figure 1 is a side elevational view, partly in section, of a' strapping and nailing machine according to this invention
  • Figure 2 is another side elevational view, partly in section, of the strapping and nailing machine of Figure 1;
  • Figure 3 is a horizontal section taken on the line 3 3 of Figure l;
  • Figure 4 is a detailed sectional view of the tape cutting mechanism
  • Figure 5 is a cross section of the cutting knife and anvil of Figure 4.
  • Figure 6 is a detailed plan View partly in section of the finger strap guide control means
  • Figure 7 is a side elevation of the finger strap guide Y control means of Figure 6;
  • Figure 8 is a detailed elevation partly in section of the hold rdown pin assembly
  • Figure 9 is a detailed view, partly in section, of the means of attachment of the hold down pin actuating air cylinder
  • a .Figure l0 is a detail view, partly in section, of one of the controls for the motors.
  • Figure 11 is a diagrammatic View of the wiring of the various controls in the device.
  • the strapping and nailing machine of this invention is assembled by modifying a standard nailing machine such as, for example, the type shown in the patent to Paxton, Fatent No. 2,232,725, issued February 25, 1941, and consequently the drawings do not show welll known details of the nailing machine. Detailed information on such machines may be obtained by reference to the aforementioned patent or to other similar patents.
  • Figure 1 aA conventional nailing .machine 10 having a box or work feed conveyor 12, work table 14 and work removal conveyor 16.
  • the work table is provided with a pair of work ejection conveyor chains 18 and 20 for removing the completed Work from the table and is also provided with a pair of work stop arms 22 ⁇ and 24.
  • These arms 22 and 24 are pivoted at the points 26 and 28 and will swing freely toward the operator and the incoming box, but will move in the opposite direction with the box only to a predetermined point whereupon the arm 22 actuates a lever 30 to momentarily depress a microswitch 32.
  • the arms are prevented from moving further by means of a conventional locking mechanism on the nailing machine which releases upon the impact of the nailing operation to allow the swinging arms 22 and 24 to release the box.
  • the arms are spring urged towards the work table by means of suitable springs such as springs 36 and 38.
  • the pivots 26 and 28, the lever 30, the microswitch 32, and the springs 36 and 38 are supported on and fastened to a pair of supports carried by the table 14, such as T- sections 40 and 42, best seen in Figure 2.
  • the support 42 is further provided with an off-set bracket 44 for receiving the lever 30, while one end of each of the supports 40 and 42 is also provided with a collar 46 and 47 for supporting the swinging arms 22 and 24.
  • the table 14 is raised by means of a pair of air cylinders 48 and 50, best seen in Figure 2, which are supplied with air through conduits 52 and 54 which are connected to a solenoid actuated valve 56.
  • the cylinders 48 and 50 are provided with pistons 58 and 60 which are fastened to a supporting beam 62 which extends transversely of and supports the table 14.
  • air pressure is admitted to the cylinders 48 and and the table 14 is raised.
  • a depending bracket 64 is attached to a triangular brace 66 on the bottom portion of the table 14.
  • the bracket 64 carries an actuating rod 68 perpendicular thereto, see Figure 2, and this rod engages the actuating Iever 70 of an air valve 72.
  • the actuating lever 70 is pivoted to the valve 72 by means of a pair of arms 74 and a pivot pin 76 and is urged upwardly against the bar 68 by means of a spring 78.
  • the valve 72 is provided with an air inlet conduit and outlet conduit 82, the inlet conduit being connected to a supply of compressed air and the outlet being connected to the hold down pin actuating cylinder to be presently described.
  • the depending bracket 64 is also provided on one side thereof with a nodule 84 which momentarily depresses a lever 85 pivoted at 87 to depress the actuating button 86 on a microswitch 88.
  • the other under side of the table 14 is provided with a second depending bracket 90 which is attached to a triangular brace 92.
  • the bracket 90 is provided with an elongated flat cam 94, Figures l and 2, which depresses the actuating buttons on three microswitches 96, 98 and 100 as the table rises.
  • the lower end of the bracket 90 also depresses the actuating button of a further microswitch 102 as long as the table is in a lowered position.
  • the conventional nailing machines to which the device of this invention may be attached are normally ⁇ provided with a pair of transverse support beams 104 and 106 and four vertical support elements 108, 110, 112 and a fourth that cannot be seen in the drawings. These vertical elements in turn support a further pair of horizontal beams 114 and 116.
  • a pair of continuous closed path strapping guides 118 and 120 are adjustably susof brackets 122 and 124 and bolts 126 and 128.
  • the bolts 126 and 128 are received in elongated holes which run lengthwise of the beams 114 and 116, and thus the continuous strapping guides 118 and 120 may be moved towards and away from each other to accommodate any size of box desired or any strapping spacing desired.
  • the strapping guides are further braced by means of spacing rods 130 and 132 which pass through L-shaped brackets 134, 136, 138 and 140 which are secured to the strapping guides by any suitable means such as by welding.
  • a pair of lock nuts 142 and 144 provides for adjustable fastening of the rods 130 and 132 in the brackets 134, 136, 138 and 140.
  • the strapping guides are provided with a plurality of resilient box guide fingers which extend both inwardly and outwardly thereof for maintaining the boxes in the proper position.
  • the strapping guide 118 has :attached inwardly thereof box guide ngers 146 and 148 and has attached outwardly thereof box guide finger 150.
  • the other strapping guide 120 has box guide fingers 152 and 154 attached inwardly thereof and guide finger 156 extending outwardly thereof.
  • the continuous strapping guide consists of a fiat rigid strip 158 as an upper portion, and of an arcuate strip 160 joining the ends of the strip 158 to form a closed lower portion.
  • the lower portion is subdivided into a pair of three sided vertical channels 162 and 164 and a horizontalchannel 166. These channels are formed by fastening, as by welding, guide plates 168 and 170 to the rising portions of the arcuate strip 160 and by fastening similar plates 172 and 174 to the lowermost portion of the arcuate strip 160, as may be seen in Figure 3.
  • the upper strip 15S has a series of apertures therein for receiving the nails, the strap, an actuating lever, and the hold down pin.
  • the upper strip 158 is shown as having a plurality of holes 176 and 178 for receiving the nails and a plurality of conventional nailing chucks 180, 182, 184 and 186 are mounted directly over the strip 158.
  • Each nailing chuck is provided with a conventional nailing punch 188 and with a conventional tiexible tube 190 which extends upwardly to the nail receiving tunnels which are not shown.
  • the nail punches 188 are actuated by means of a plurality of nail driving beams 192, 194, 196 and 198 which are attached to a reciprocating cross head 200, as is best seen in Figure 2.
  • the cross head 200 is slidably mounted on the upper ends of the side standards of the nailing machine in vertical slots in a conventional manner as described in the afore cited Paxton patent.
  • a strap guide conduit 208 Attached to the anvil block 204 and mating with the aperture 206 is a strap guide conduit 208 which extends vertically upwardly and then horizontally to guide the strap through the aperture 206 in the anvil block 204 and thence through the aperture 202 in the upper strip 158.
  • the strap 210 passes through these two apertures it strikes the finger strap guide 212 which extends horizontally into its path in a slightly cocked position.
  • the strap As the strap is fed to the left of aperture 202 in Figure 4 it is guided toward the vertical section 162 of the continuous strapping guide by means of a similar finger strap guide 214. The strap then follows the inside of the arcuate strip 160 and emerges from vertical section 164 to again strike the under surface of the top strip 158.
  • a further nger strap guide 216 guides the end of the strap into a strap control lever 218 which extends through an aperture 220 in the top strip 158.
  • the strap control lever 218 is pivoted at 222 to the upper surface of the top strip 1,58 and its upper end engages the control button on a microswitch 224 which is operative to stop the feed of strap.
  • the end of the tape 210 drifts past the strap control lever 213 after the tape feed is cut off to secure the desired overlap.
  • the top strip 158 is also provided with an aperture 226 for receivnig the hold down pin 228.
  • the hold down pin 22-3 passes through a sleeve 233 which is secured to the strip 158 in any suitable manner, such as welding, and the pin 226 is urged upwardly by mean-s of a spring 232 which reacts against the top of the sleeve 23S and against the underside of a head 234 on the pin 228.
  • the hold down pin 223 is depressed as the box is raised by the table 14 in a manner presently to be explained and urges the free end of the strap 210 downwardly into engagement with the top of the box to permit tensioning of the strap.
  • the anvil block 204 to which the strap guide conduit 23S is attached has in its exposed side a vertical slot 236 having inwardly angled side walls 23S and 240 as is best seen in Figure 5.
  • a guillotine type knife 242 is received in the slot 236 and is held therein by means of the angled sides 23S and 240.
  • the knife 242 is attached by means of a bolt 244 to an actuating rod 246 which is supported in three apertured brackets 24S, 250 and 252 which are carried by the vertical portion of the strap lguide conduit 26S.
  • a tension spring 254 is attached to the top of the rod 246 and is suspended from a support bar 256 which passes over the beams 104 and 106 of the nailing machine to maintain the guillotine knife in a normally raised condition.
  • the rod 246 is further provided with a collar 253 which is locked thereon by means of a set screw 260.
  • Engageable with the collar S is a stud 262 which is fastened by any suitable means, such as by welding, to the nailing beam 194.
  • the stud 262 strikes a second collar 263, which is secured to the rod 246 by means of a set screw 265, and forces the rod 246 and knife 242 sharply upward.
  • the knife is then retained in this raised position by means of the spring 254.
  • the strap 210 is thus cut during the nailing stroke, while it is under tension, and the power to the motors is removed substantially simultaneously.
  • the prime movers for feeding the strap 210 preferably consist of a pair of air i of input pipes 280, 281 and 232, 233 which in turn are connected to a pair of solenoid actuated valves 284 and 286.
  • One input pipe on each air motor is adapted to run it in a forward direction while the other input pipe is adapted to run it in a reverse direction under the control of the solenoid actuated valves 284 and 236.
  • the valves 284 and 286 are serially connected to a pair of pressure regulators 288 and 290, an air oiler 292, an air filter 294 and a main valve 296 which leads to the 'source of compressed air supply.
  • the air motors 264. and 266 have air exhaust pipes 298 and 300 and shafts 302 and 304.
  • the shafts 302 and 304 are connected by means of couplings 306 and 308 and stud shafts 310 and 312 to a pair of tape drive wheels 314, best seen in Figure 2.
  • the stud shafts 310 and 312 are supported on brackets 316 and 318 by means of bearings 320 and 322.
  • the drive wheels 314, as seen in Figure 2 may be knurled wheels which engage with an idler wheel 324 which may be spring urged toward the drive wheels. The strapping is then frictionally driven between the two wheels.
  • the strapping guide conduit 208 terminates a short distance from the drive wheel 314.
  • the ⁇ .strap is supplied from a suitable strapping reel 328 pivoted at 330 and passes beneath a suitable slack remover 325, which may 332 conveniently constitute a Weighted bar 326 pivoted at 332.
  • the strap 210 is fed from the reel 328 into the strapping guide conduit 208, through the anvil block aperture 206, through the upper strip aperture 202, over nger strap guides 212, 214, through the arcuate portion of the continuous 'strapping guide, under the hold down pin 223, over the finger strap guide 216, into the lever 218, and thence beneath the bight of the tape a1- ready in the continuous strapping guide to form the overlap.
  • the hold down pin 228 is actuated by means of an air cylinder 331 which is fastened by means of a Z-shaped bracket 333 to the strapping conduit 203 as may best be seen in Figures 8 and 9.
  • an air cylinder 331 which is fastened by means of a Z-shaped bracket 333 to the strapping conduit 203 as may best be seen in Figures 8 and 9.
  • the head 234 of the hold down pin 228 is engaged by the underside of a lever 334 which is pivoted on a pair of brackets 336 carried on a support bar 338 bolted to the vertical brackets 122 and 124.
  • the air cylinder 331 has air pressure applied thereto its piston 340 will force the lever 334 downwardly and will thus depress the hold down pin 223 so that its lower extremity passes through the aperture 226 in the strip 158 to enter the continuous strapping guide.
  • the finger strap guides comprise a series of fingers 212, 214, 216, 217 and 219 on a backing bar 342.
  • the finger strap guides 212, 214, 216, 217 and 219 pass through suitable slots 243 in a pair of support bars 245 which are carried by the upper strips 15S- as may best be seen in Figures 6 and 8.
  • the backing bars 342 have levers 346 and 348 pivoted at opposite ends thereof and the ends of the levers 346 and 343 are joined at common pivots 350 and 352 which are carried by a longitudinal bar 354.
  • An upwardly extending bracket 356 is carried by the longitudinal bar 354 and has secured thereto by means of lock nuts 358 and 360 the piston 362 of a iinger strap guide actuating cylinder 364.
  • the piston 362 is urged outwardly by means of a spring 363.
  • the actuating cylinder 364 is controlled by means of a solenoid actuated valve 366 and is suspended by means of brackets 367 from a beam 368 fastened to the beams 114 and 116.
  • a pair of microswitches 376 and 372 is provided on the beam 363 and these are so arranged as to be engaged by the upper portion of the bracket 356 when the piston 362 is in its extended and return positions respectively.
  • the cross head 209 actuates a pair of microswitches 374 and 376 on its downward or nailing stroke.
  • the microswitch 374 is mounted on the support element 108, Figure 1
  • the microswitch 376 is mounted on the support element 112.
  • the microswitch 376 is actuated by means of a lever 378which is pivoted at 380 to a bracket 382 fastened to the support element 112.
  • a coil spring 384 urges the lever 378 into tight frictional engagement with the washer 379 so that considerable force is needed to move lever 378.
  • the lever thus remains in either an upward or downward position until it is acted upon by some external means as is presently described.
  • a nodule or stud 386 is provided on the cross head 261) for urging the left end of lever 378 downwardly at the bottom of the nailing stroke. This downward movement of the left end of lever 378 opens the microswitch 376 to cut the air supply to the air motors 264 and 266 in a manner presently to be described.
  • Microswitch 376 is later reclosed by means of a retaining bar 388 which slidably passes through the table 14 and terminates in a bent over portion 394. The upper end of the retaining bar 388 terminates in a bent over portion 390 which passes through the lever 378.
  • the nailing machine is provided with a conventional nailing pedal 480 which, according to the invention, is actuated by means of an air cylinder 402 which is in turn controlled by means of a solenoid actuated valve 404.
  • FIG. ll there is shown a diagrammatic picturization of the wiring of the various microswitches and solenoids which control the strapping machine of this invention.
  • the air motors 264 and 266 are connected by means of air supply pipes 280, 281 and 282, 233 to the solenoid valves 284 and 286 respectively.
  • the solenoid valves are of the type which open the air valve when the current is on and close the air valve when the current is ott and are further of the two-way type in that they are operable either to feed air supply through conduits 281 and 282 to rotate the air motors in a forward direction or through conduits 283 and 284 to operate the motors in a reverse direction.
  • the motors are operated in a forward direction upon the energization of connections 406 and 488 which are connected together and to a common connection 410.
  • the connection 410 in turn is connected to a switch 412 in a timer 414 and the other side of the switch 412 is connected by means of a lead 416 to the microswitches 224 and 372 which join one line 418 of a source of current supply.
  • a pair of terminals 42() and 422 for operating the air motors 264 and 266 in the reverse direc- V tion for retracting strapping are connected through microswitches 96 and 98 to a common connection 424.
  • the lead 424 goes through the microswitch 376 to the supply line 418.
  • Each of the microswitches 96 and 98 is paralleled by a manual switch 426 and 428 which make it possible to manually operate the air motors 264 and 266 in a reverse direction to manually retract strapping from the guides 118 and 120.
  • the common connections 430 and 432 of solenoids 234 and 286 are connected through manual switches 434 8 and 436 to the other supply line 440.
  • energization of the leads 420 and 422 will cause the air motors 264 and 266 to feed strapping into the guides 11S and 120 while energization of the connections 406 and 488 will cause the air motors to retract strapping from the guides.
  • the timer 414 is provided with a running winding 442 which is connected to the lead 416 and to a lead 444 which connects to the supply lead 440.
  • the timer 414 is thus energized as long as microswitches 372 and 224 are closed and the switch 412 is closed for the predetermined time set on the timer.
  • the solenoid 404 which controls the air supply to the piston 402 for actuating the nailing pedal 400 is connected by means of lead 444 to supply :line 448 and by means of a lead 446 to the microswitch 108.
  • the microswitch 160 is in turn connected by means of lead 448 to the microswitch 376 and thence to the supply line 418.
  • the nailing pedal 400 is of the conventional type utilized on nailing machines and will cause the nailing machine to continue to nail as long as it is depressed. A nailing operation is consequently instituted When both microswitches 100 and 376 are in an on position and is terminated when switch 376 is opened by the nailing stroke so that only one nailing operation takes place.
  • the table lifting cylinders 48 and 50 receive their air supply from a solenoid actuated valve 56. While the solenoid valves 284 and 286 were of the type which open while the current is on and automatically close when the current is cut olf, the solenoid valve 56 is of a different type which opens with a pulse of current and remains open even though this current is removed. The valve is subsequently closed by means of a pulse of current to a second winding which can only be elective if the current to the first winding has first been removed.
  • the solenoid 56 thus has a pair of opening terminals 45t! and 452 and a pair of closing terminals 456 and 458. One opening terminal 450 is connected through lead 454 to the supply line 440 and the other opening terminal 452 is connected to microswitch 370 and thence to microswitch 102 and to supply line 418.
  • the winding for closing the valves has a pair of terminals 456 and 458, one of which is connected through lead 460 to the supply line 440 and the other of which is connected through lead 462 to microswitch 374 and thence to supply line 418.
  • the valve is thus opened to cause lifting of the table when both microswitches 102 and 370 are closed and this circuit is opened to prepare the valve for lowering of the table when microswitch 102 opens in a manner to be presently described.
  • the lowering operation is caused by a pulse of power to the terminals 456 and 458 through the microswitch 374 as that switch is momentarily closed by the cross head 200 at the bottom of the nailing stroke.
  • the pistons 331 which depress the hold down pins are connected by means of conduits 361 and 362 to the conduit 82 which leads to the valve 72.
  • An inlet conduit 80 supplies air to the valve 72 which is mechanically operated by the bar 68 on the bracket 64.
  • the solenoid actuated valve 366 which controls the finger strap guide cylinder 364 is of the same type as solenoid 56, in that the valve opens upon receiving a pulse of current and remains open until a pulse of current in a further winding causes it to close.
  • the piston 362 is held in a distended position by the spring 363 as long as the solenoid valve is closed.
  • the solenoid 366 is provided with a pair of leads 470 and 472 for closing the Valve 366 and allowing the spring 363 to distend the piston 362.
  • the terminals 470 and 472 are connected respectively to solenoid microswitch 32 and thence to supply line 418 and to lead 474 and thence to supply line 440.
  • the solenoid winding for opening the valve 366 is provided With a pair of terminals 476 and 478 which are respectively connected to the microswitch 88 and thence to supply line 418 and to lead 480 and thence to supply line 440.
  • momentary closure of microswitch 32v by means of a cam section 482 on arm 24 causes the solenoid actuated valve 366 to close while momentary energization of microswitch 88 by means of nub 84 on bracket 64 causes the valve to open to retract the piston 362 and to move the finger strap guides into position.
  • the operation of the strapping machine is as follows: Assume that the machine is standing at an at-rest position with strapping in the guide 120 but with no box inserted. As a box is pushed into the guides 118 and 120 by the: operator it strikes the arms 22 and 24 forcing them outwardly and causing the cam section 482 on arm 24 to momentarily turn microswitch 32 on to thereby send a pulse of power to the closing winding (terminals 470 and 472) of solenoid actuated valve 366. This causes the valve 366 to close and allows the spring 363 to extend the piston 362 to remove the finger strap guides 212, 214, 216, 217 and 219 from the strapping guides 118 and 120.
  • the bracket 356 strikes the button on microswitch 370 to close that switch in the raising circuit of solenoid actuated valve 56 (terminals 458 and 452).
  • the table at this time is in its lowered position thereby depressing the button on microswitch 102 and closing that switch (as may be seen in Figure l) to complete a circuit to the opening winding on solenoid actuated valve 56 through lead 454 to terminal 450 and from terminal 452 through microswitches 370 and 102.
  • microswitches 96, 98, 100 to be closed by means of the cam 94, as may be seen in Figures 1 and 2.
  • the microswitches 96 and 98 located beneath the table V14, Figures 1 and 2 are in the circuits of the reverse or strap retracting windings of the solenoid actuated valves 284 and 286 and are connected in series with lever actuated microswitch 376, Figure 10.
  • Microswitch 376 is closed due to the actions of the retaining bar 388 in lowering the right end of the lever 378 during the previous fall of the table.
  • Microswitch 100 also in series with microswitch 376, controls the current to the solenoid actuated valve 404 to admit air to the cylinder 402 to depress the nailing pedal 400 thereby causing the nailing machine to nail. Depression of nailing pedal 400 causes the nailing beams 192, 194, 196 and 198 to first rise and then come downwardly in the conventional manner. During the time that the nailing bars are rising, the air motors 264 and 266 complete the strap tensioning operation so that the strap is completely tensioned by the time that the nailing beams commence their downward stroke. Where the 10 source of motive power is not vsufficiently fast to complete the tensioning operation with this short period of time it may be necessary to utilize a timer to delay the nailing stroke until after the tensioning is complete.
  • the lug 262 on nailing beam 194 engages the collar 258 on rod 246 to force the guillotine knife 242 downwardly over the anvil block 204 to sever the strap 210.
  • the downward motion of the nailing beams 192 through 198 is caused by the cross head 200 and as the cross head itself moves downwardly it closes microswitch 374, best seen in Figure l, to send a momentary pulse of power to the valve closing winding (terminals 456 and 458) of solenoid actuated valve 56 to remove the supply of air to the lifting cylinders 48 and 58 and to allow the table 14 to rapidly drop.
  • the downward movement of the cross head 200 also causes the lug'386, best seen in Figure 10, to depress the left end of lever 378 causing the right end of the lever to rise and open the microswitch 376.
  • This breaks the supply of current to the solenoid 404 controlling the nailing pedal actuating cylinder 402, and also breaks the supply of current to the reverse windings of the solenoids 284 and 286 so that the air motors 264 and 266 come to rest.
  • the size of the lug 386 and the spacing of the lever 378 from the lug 386 must be properly proportioned so that the air to the air motors is cut off prior to the time that the guillotine knife 242 severs the strap 210, in order to prevent the air motors from snatching the severed strap out of the guides.
  • Momentarily breaking the power to the solenoid 404 actuating the nailing pedal cylinder 402 prevents the nailing machine from cycling more than once.
  • the downward motion of the cross head 200 momentarily closes microswitch 374 sending a flash of current to the solenoid S6 to cause a rapid dropping of the table 14.
  • the table 14 drops it engages the bent portion 294 of retaining bar 388 to pull the right end of lever 378 downwardly to allow microswitch 376 to close until the next downward movement of the nailing head 200 on the next nailing cycle.
  • the dropping table also causes nub 84, Figure l, to strike lever to momentarily close microswitch 88 to send a pulse of current to the solenoid actuated valve 366 (terminals 476 and 478) to cause the piston 362 to move inwardly thereby moving the finger strap guides 342 into position in the strapping guides 118 and 120.
  • the bracket 356 engages microswitch 372 which is in series with microswitch 224 and is connected in one lead to the timer 414.
  • the microswitch 224 is normally in a closed position and is opened by means of lever 218 when the free end of the strap 210 strikes the lever 218 upon completing its circle around the guides 118 and 120.
  • the microswitch 372 is closed by means of the finger strap guides moving into position, the microswitch 224 is also closed since there is no strap in the guides 118 and 120. This energizes the timer 414 closing the timer switch 412 and this supplies power to the forward or feed-windings (terminals 406 and 408) of the solenoid actuated valves 284 and 286 for the air motors 264 and 266.
  • the momentum of the motors causes the free end of the strapping 210 to move past the lever 218 so that the desired overlap of strapping is obtained.
  • the timer 414 is utilized as a safety device to take care of the situation which might occur were the strapping to jump the tracks 118 and 120 and not trip the lever 218 and microswitch 224. In this circumstance the air motors would continue to feed strapping until a workman noticed that something was wrong.
  • the timer 414 maintains the switch 412 in a closed position for a preset period of time which isso adjusted as to allow the strapping to hit the lever 218. Thus, if the strapping does jump the track the timer 414 will stop the air motors 264 and 266 shortly after the end of the strapping reaches the position adjacent the lever 218.
  • the strapping machine is now in its original position and is ready to receive another box to institute another cycle of operation.
  • a strapping machine the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, feeding means for feeding a length of strap into the frame with overlapping portions, said feeding means including a drive Wheel continuously rotationally locked to an air motor, means for clamping said strap against said object to allow tensioning of said strap, means for reversing said air motor to tension said strap and to cause said air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the air supply to said air motor, said drive wheel remaining in continuous driving engagement with said strap through an entire cycle of operation.
  • a strapping machine the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, said feeding means including a source of motive power capable of stalling Without overheating, means for causing said supporting means to rise, means for clamping said strap against said object to allow tensioning of said strap, saidA clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to cause said source of motive power to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the energy supply to said source of motive power.
  • a strapping machine the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions and including an air motor, means for causing said supporting means to rise, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to causesaid air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the air supply to said air motor.
  • a strapping machine the combination of; means for supporting the object to be strapped, an unbroken strap guide frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, said feeding means including an air motor, means for causing said supporting means to rise incident to insertion of an object into said frame, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to cause said air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the air Supply to said air motor.
  • a strapping machine the combination of; means for supporting the object to be strapped, an unbroken frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, nger strap guides movable into and out of said frame, means for moving said finger strap guides, means for feeding a length of strap into the frame with overlapped portions incident to movement of said finger strap guides into said frame, said feeding means including an air motor, means causing said nger strap guides to be withdrawn from said frame incident to insertion of an object into said frame, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to cause said air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap and to cut the air supply to said air motor, means operable incident to nailing to cause said supporting means to fall, means operable incident to said fall of said
  • a strapping machine the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, means for causing said supporting means to rise, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap, means for nailing said overlapping portions to said objects, and means operable incident to said nailing to sever said strap.
  • a strapping machine the combination of; means for supporting the object to be strapped, an unbroken strap guide frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, means for causing said supporting means to rise incident to insertion of an object into said frame, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said -supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap, means for nailing said overlapping portions to said object, and means operable incident to said nailing to sever said strap.

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Description

Feb. 19, 1957 M. M. EISENBERG 2,781,516
STRAPPING MACHINE Filed Aug. 27. 1954 4 sheets-sheet 1 INVENTOR Monms M. ElsENBERe ATTORNEES' Feb. 19, 1957 M, M E|SENBERG 2,781,516
STRAPPING MACHINE Filed Aug. 27, 1954 4 Sheets-Sheet 3 3a f6 f4 F-.
/36 H4 I #70 ,4 7 I INVENTOR MoRRls M ElsENBERG- United States Patent O "ice ,i
STRAPPING MACHINE Morris M. Eisenberg, Clarence, Mo.
Application August 27, 1954, Serial No. 452,556
8 Claims. (Cl. 1-123) This invention relates to a machine for strapping boxes and more particularly to a machine for automatically applying and nailing metal strapping to a box.
The art of applying metal strapping to boxes, particularly the ends or" boxes, is extremely old and has been the subject of rather extensive developmental work. Numerous rather complex machines have been devised for automatically applying strapping and then sealing such strapping primarily by means of some type of clip, seal or tie which securely clamps together the overlapped ends of the strap independently of the box itself. Other machines utilize wire binders rather than metal strapping and provide tying means for forming various types of twists or ties in the wire to secure the ends together.
Still other machines were designed for nailing metal strapping around the ends of boxes, but these machines utilized the nails not so much to fasten the overlapped ends of the strapping together as to fasten the strapping to the boxes on all sides thereof. No provision was made for automatically feeding the strapping completely around 'the box and the entire operation was manual in the sense that the operator had to place the box on one edge, actuate the nailing mechanism, turn the box to a second edge, actuate the nailing mechanism, and so on until the operator completely rotated the box and nailed strapping to each edge thereof.
The previously available machines were all developed for a specific predetermined job and utilized a large amount of rather complex machinery. Conventional electric motors ere used almost universally for driving the machine and a large number of driving wheels were utilized for feeding and then withdrawing and tensioning the strap. The use of this type of motive power and strap drive required the use of numerous clutches of various types in the tension mechanism, while the use ot' seals, clips and ties for securing the strap necessitated the development of rather complicated clamping or holding mechanisms for retaining the loose end of the strap during the tensioning operation.
ln tne usual prior art machine the source of motive power, usually an electric motor, operated continuously while the machine was in use, with feed of the trap being controlled either by clutches or by movement of the strap driving wheel, and with tensioning of the strap taking place through a clutch. In addition those machines which did provide for automatically feeding the strapping entirely around the box utilized strapping guides with gaps therein at the position of sealing mechanism and because of such construction necessarily employed rather complex strap guiding means at such gap. Most controls were of the cam type which necessarily had to be designed into the original machine.
According to the present invention there is provided a simple and inexpensive means for converting a standard nailing machine into a machine for applying and nailing strapping to boxes. A continuous unbroken strap guide is utilized in conjunction with a reversible source of motive power which may be stalled without any deleterious 2,781,516 Patented Feb. 19, 1957 eects and without excessive consumption of power. This combination makes it possible to eliminate the complicated and complex multi-wheel drive and clutching arrangements of previous machines and makes possible a simple and inexpensive guide means for the strapping.
According to the invention the strap is fed completely about the box, the free end thereof is held by an extremely simple holding mechanism, the strap is tensioned and then nailed at the overlapped portion only in an entirely automatic sequence. Complicated strap tensioning arrangements are avoided and the operating table and nailing mechanism are provided by the existent standard nailing machine.
It is accordingly a primary object of the present invention to provide a simple and inexpensive machine for applying strapping around a box and for nailing the overlapping portions of such strapping to the box.
It is another object of this invention to provi-de such a strapping means by modifying a standard nailing inachine.
lt is another object of this invention to provide a means for feeding strap around a box and then tensioning such strap by means of the same prime mover, which may be stalled without -damage thereto and without excessive power consumption.
It is another object of this invention to provide a method and means for applying and nailing strapping to boxes utilizing a continuous strapping guide which completely encircles the box to be strapped.
It is another object of thisy invention to provide a means and method for applying and nailing strapping to a box utilizing a simplified plunger type holding mechanism for the strap tensioning operation.
Further objects and advantages of the invention will become apparent upon reference to the following specification, claims and drawings wherein:
Figure 1 is a side elevational view, partly in section, of a' strapping and nailing machine according to this invention;
Figure 2 is another side elevational view, partly in section, of the strapping and nailing machine of Figure 1;
Figure 3 is a horizontal section taken on the line 3 3 of Figure l;
Figure 4 is a detailed sectional view of the tape cutting mechanism;
Figure 5 is a cross section of the cutting knife and anvil of Figure 4;
Figure 6 is a detailed plan View partly in section of the finger strap guide control means;
Figure 7 is a side elevation of the finger strap guide Y control means of Figure 6;
Figure 8 is a detailed elevation partly in section of the hold rdown pin assembly;
Figure 9 is a detailed view, partly in section, of the means of attachment of the hold down pin actuating air cylinder;
A .Figure l0 is a detail view, partly in section, of one of the controls for the motors; and
Figure 11 is a diagrammatic View of the wiring of the various controls in the device.
The strapping and nailing machine of this invention is assembled by modifying a standard nailing machine such as, for example, the type shown in the patent to Paxton, Fatent No. 2,232,725, issued February 25, 1941, and consequently the drawings do not show welll known details of the nailing machine. Detailed information on such machines may be obtained by reference to the aforementioned patent or to other similar patents.
Turning more particularly to the drawings there is shown in Figure 1 aA conventional nailing .machine 10 having a box or work feed conveyor 12, work table 14 and work removal conveyor 16. The work table is provided with a pair of work ejection conveyor chains 18 and 20 for removing the completed Work from the table and is also provided with a pair of work stop arms 22 `and 24. These arms 22 and 24 are pivoted at the points 26 and 28 and will swing freely toward the operator and the incoming box, but will move in the opposite direction with the box only to a predetermined point whereupon the arm 22 actuates a lever 30 to momentarily depress a microswitch 32.
The arms are prevented from moving further by means of a conventional locking mechanism on the nailing machine which releases upon the impact of the nailing operation to allow the swinging arms 22 and 24 to release the box. The arms are spring urged towards the work table by means of suitable springs such as springs 36 and 38. The pivots 26 and 28, the lever 30, the microswitch 32, and the springs 36 and 38 are supported on and fastened to a pair of supports carried by the table 14, such as T- sections 40 and 42, best seen in Figure 2. The support 42 is further provided with an off-set bracket 44 for receiving the lever 30, while one end of each of the supports 40 and 42 is also provided with a collar 46 and 47 for supporting the swinging arms 22 and 24.
According to the invention the table 14 is raised by means of a pair of air cylinders 48 and 50, best seen in Figure 2, which are supplied with air through conduits 52 and 54 which are connected to a solenoid actuated valve 56. The cylinders 48 and 50 are provided with pistons 58 and 60 which are fastened to a supporting beam 62 which extends transversely of and supports the table 14. Upon energization of the proper winding of the solenoid 56 air pressure is admitted to the cylinders 48 and and the table 14 is raised.
As the table 14 rises it actuates several control mechanisms as follows. Thus a depending bracket 64, best seen in Figure 1, is attached to a triangular brace 66 on the bottom portion of the table 14. The bracket 64 carries an actuating rod 68 perpendicular thereto, see Figure 2, and this rod engages the actuating Iever 70 of an air valve 72. The actuating lever 70 is pivoted to the valve 72 by means of a pair of arms 74 and a pivot pin 76 and is urged upwardly against the bar 68 by means of a spring 78. The valve 72 is provided with an air inlet conduit and outlet conduit 82, the inlet conduit being connected to a supply of compressed air and the outlet being connected to the hold down pin actuating cylinder to be presently described.
The depending bracket 64 is also provided on one side thereof with a nodule 84 which momentarily depresses a lever 85 pivoted at 87 to depress the actuating button 86 on a microswitch 88.
The other under side of the table 14 is provided with a second depending bracket 90 which is attached to a triangular brace 92. The bracket 90 is provided with an elongated flat cam 94, Figures l and 2, which depresses the actuating buttons on three microswitches 96, 98 and 100 as the table rises. The lower end of the bracket 90 also depresses the actuating button of a further microswitch 102 as long as the table is in a lowered position.
It will thus be seen that as the table 14 rises the air valve 72 is opened to provide a supply of air to the hold down pin operating cylinder, the microswitch 102 is opened, the microswitches 96, 98 and 100 are closed, but the microswitch 88 is not -aiected inasmuch as lever 85 is raised up and away from microswitch 88 by nodule 84. Microswitch 88 thus remains open.
The conventional nailing machines to which the device of this invention may be attached are normally `provided with a pair of transverse support beams 104 and 106 and four vertical support elements 108, 110, 112 and a fourth that cannot be seen in the drawings. These vertical elements in turn support a further pair of horizontal beams 114 and 116.
According to the invention a pair of continuous closed path strapping guides 118 and 120 are adjustably susof brackets 122 and 124 and bolts 126 and 128. The bolts 126 and 128 are received in elongated holes which run lengthwise of the beams 114 and 116, and thus the continuous strapping guides 118 and 120 may be moved towards and away from each other to accommodate any size of box desired or any strapping spacing desired.
The strapping guides are further braced by means of spacing rods 130 and 132 which pass through L-shaped brackets 134, 136, 138 and 140 which are secured to the strapping guides by any suitable means such as by welding. A pair of lock nuts 142 and 144 provides for adjustable fastening of the rods 130 and 132 in the brackets 134, 136, 138 and 140.
The strapping guides are provided with a plurality of resilient box guide fingers which extend both inwardly and outwardly thereof for maintaining the boxes in the proper position. Thus, referring to Figures l and 3, the strapping guide 118 has :attached inwardly thereof box guide ngers 146 and 148 and has attached outwardly thereof box guide finger 150. The other strapping guide 120 has box guide fingers 152 and 154 attached inwardly thereof and guide finger 156 extending outwardly thereof.
Referring more particularly to Figures 2, 3 and 4, it will be seen that the continuous strapping guide consists of a fiat rigid strip 158 as an upper portion, and of an arcuate strip 160 joining the ends of the strip 158 to form a closed lower portion. The lower portion is subdivided into a pair of three sided vertical channels 162 and 164 and a horizontalchannel 166. These channels are formed by fastening, as by welding, guide plates 168 and 170 to the rising portions of the arcuate strip 160 and by fastening similar plates 172 and 174 to the lowermost portion of the arcuate strip 160, as may be seen in Figure 3.
The upper strip 15S has a series of apertures therein for receiving the nails, the strap, an actuating lever, and the hold down pin. Thus referring to Figure 4 the upper strip 158 is shown as having a plurality of holes 176 and 178 for receiving the nails and a plurality of conventional nailing chucks 180, 182, 184 and 186 are mounted directly over the strip 158. Each nailing chuck is provided with a conventional nailing punch 188 and with a conventional tiexible tube 190 which extends upwardly to the nail receiving tunnels which are not shown.
The nail punches 188 are actuated by means of a plurality of nail driving beams 192, 194, 196 and 198 which are attached to a reciprocating cross head 200, as is best seen in Figure 2. The cross head 200 is slidably mounted on the upper ends of the side standards of the nailing machine in vertical slots in a conventional manner as described in the afore cited Paxton patent.
Referring again to Figure 4 it will be seen that approximately mid-way in the upper strip 158 there is provided an elongated aperture 202 adjacent which there is mounted an anvil block 204 having a strap feed aperture 206 therethrough. Attached to the anvil block 204 and mating with the aperture 206 is a strap guide conduit 208 which extends vertically upwardly and then horizontally to guide the strap through the aperture 206 in the anvil block 204 and thence through the aperture 202 in the upper strip 158. As the strap 210 passes through these two apertures it strikes the finger strap guide 212 which extends horizontally into its path in a slightly cocked position. As the strap is fed to the left of aperture 202 in Figure 4 it is guided toward the vertical section 162 of the continuous strapping guide by means of a similar finger strap guide 214. The strap then follows the inside of the arcuate strip 160 and emerges from vertical section 164 to again strike the under surface of the top strip 158.
A further nger strap guide 216 guides the end of the strap into a strap control lever 218 which extends through an aperture 220 in the top strip 158. The strap control lever 218 is pivoted at 222 to the upper surface of the top strip 1,58 and its upper end engages the control button on a microswitch 224 which is operative to stop the feed of strap. As will be explained in more detail hereinafter the end of the tape 210 drifts past the strap control lever 213 after the tape feed is cut off to secure the desired overlap.
The top strip 158 is also provided with an aperture 226 for receivnig the hold down pin 228. The hold down pin 22-3 passes through a sleeve 233 which is secured to the strip 158 in any suitable manner, such as welding, and the pin 226 is urged upwardly by mean-s of a spring 232 which reacts against the top of the sleeve 23S and against the underside of a head 234 on the pin 228. The hold down pin 223 is depressed as the box is raised by the table 14 in a manner presently to be explained and urges the free end of the strap 210 downwardly into engagement with the top of the box to permit tensioning of the strap.
The anvil block 204 to which the strap guide conduit 23S is attached has in its exposed side a vertical slot 236 having inwardly angled side walls 23S and 240 as is best seen in Figure 5. A guillotine type knife 242 is received in the slot 236 and is held therein by means of the angled sides 23S and 240. The knife 242 is attached by means of a bolt 244 to an actuating rod 246 which is supported in three apertured brackets 24S, 250 and 252 which are carried by the vertical portion of the strap lguide conduit 26S. A tension spring 254 is attached to the top of the rod 246 and is suspended from a support bar 256 which passes over the beams 104 and 106 of the nailing machine to maintain the guillotine knife in a normally raised condition. The rod 246 is further provided with a collar 253 which is locked thereon by means of a set screw 260. Engageable with the collar S is a stud 262 which is fastened by any suitable means, such as by welding, to the nailing beam 194.
It will be apparent from reference to Figure 4 that when the nailing beam 194 strikes downwardly in its normal nailing operation the stud 262 will force the collar 253, bar 246 and guillotine knife 242 sharply downwardly to shear the strap 210 at the anvil block 204. The position of the collar 258 with respect to the stud 262 is so adjusted that the knife severs the strap passing through the anvil block 204 but does not sever the strap below the strip 158. Thus the knife 242 never touches the surface of the box to be stopped.
After the nailing beam 194 has completed its downward stroke and rises, the stud 262 strikes a second collar 263, which is secured to the rod 246 by means of a set screw 265, and forces the rod 246 and knife 242 sharply upward. The knife is then retained in this raised position by means of the spring 254. The strap 210 is thus cut during the nailing stroke, while it is under tension, and the power to the motors is removed substantially simultaneously.
According to the invention the prime movers for feeding the strap 210 preferably consist of a pair of air i of input pipes 280, 281 and 232, 233 which in turn are connected to a pair of solenoid actuated valves 284 and 286. One input pipe on each air motor is adapted to run it in a forward direction while the other input pipe is adapted to run it in a reverse direction under the control of the solenoid actuated valves 284 and 236. The valves 284 and 286 are serially connected to a pair of pressure regulators 288 and 290, an air oiler 292, an air filter 294 and a main valve 296 which leads to the 'source of compressed air supply.
The air motors 264. and 266 have air exhaust pipes 298 and 300 and shafts 302 and 304. The shafts 302 and 304 are connected by means of couplings 306 and 308 and stud shafts 310 and 312 to a pair of tape drive wheels 314, best seen in Figure 2. The stud shafts 310 and 312 are supported on brackets 316 and 318 by means of bearings 320 and 322. The drive wheels 314, as seen in Figure 2, may be knurled wheels which engage with an idler wheel 324 which may be spring urged toward the drive wheels. The strapping is then frictionally driven between the two wheels.
The strapping guide conduit 208 terminates a short distance from the drive wheel 314. The `.strap is supplied from a suitable strapping reel 328 pivoted at 330 and passes beneath a suitable slack remover 325, which may 332 conveniently constitute a Weighted bar 326 pivoted at 332.
When the air motors 264 and 266 are energized to feed forwardly, the strap 210 is fed from the reel 328 into the strapping guide conduit 208, through the anvil block aperture 206, through the upper strip aperture 202, over nger strap guides 212, 214, through the arcuate portion of the continuous 'strapping guide, under the hold down pin 223, over the finger strap guide 216, into the lever 218, and thence beneath the bight of the tape a1- ready in the continuous strapping guide to form the overlap.
The hold down pin 228 is actuated by means of an air cylinder 331 which is fastened by means of a Z-shaped bracket 333 to the strapping conduit 203 as may best be seen in Figures 8 and 9. Referring particularly to Figure 8 it will be seen that the head 234 of the hold down pin 228 is engaged by the underside of a lever 334 which is pivoted on a pair of brackets 336 carried on a support bar 338 bolted to the vertical brackets 122 and 124. It will be obvious that when the air cylinder 331 has air pressure applied thereto its piston 340 will force the lever 334 downwardly and will thus depress the hold down pin 223 so that its lower extremity passes through the aperture 226 in the strip 158 to enter the continuous strapping guide.
Referring to Figures 6, 7 and 8 it will be seen that the finger strap guides comprise a series of fingers 212, 214, 216, 217 and 219 on a backing bar 342. The finger strap guides 212, 214, 216, 217 and 219 pass through suitable slots 243 in a pair of support bars 245 which are carried by the upper strips 15S- as may best be seen in Figures 6 and 8. The backing bars 342 have levers 346 and 348 pivoted at opposite ends thereof and the ends of the levers 346 and 343 are joined at common pivots 350 and 352 which are carried by a longitudinal bar 354.
An upwardly extending bracket 356 is carried by the longitudinal bar 354 and has secured thereto by means of lock nuts 358 and 360 the piston 362 of a iinger strap guide actuating cylinder 364. The piston 362 is urged outwardly by means of a spring 363. The actuating cylinder 364 is controlled by means of a solenoid actuated valve 366 and is suspended by means of brackets 367 from a beam 368 fastened to the beams 114 and 116. A pair of microswitches 376 and 372 is provided on the beam 363 and these are so arranged as to be engaged by the upper portion of the bracket 356 when the piston 362 is in its extended and return positions respectively. By reference to Figure 6 it will be seen when the piston 362 is in its extended position the finger strap guides 212,
214, 216, 217 and 219 are in their retracted positions while, when the piston 362 is in its return position, the finger strap guides are in their extended or inserted position.
As may be seen in Figures l and 2, the cross head 209 actuates a pair of microswitches 374 and 376 on its downward or nailing stroke. Thus the microswitch 374 is mounted on the support element 108, Figure 1, while the microswitch 376 is mounted on the support element 112.
As may be seen in Figure 10, the microswitch 376 is actuated by means of a lever 378which is pivoted at 380 to a bracket 382 fastened to the support element 112. A coil spring 384 urges the lever 378 into tight frictional engagement with the washer 379 so that considerable force is needed to move lever 378. The lever thus remains in either an upward or downward position until it is acted upon by some external means as is presently described.
A nodule or stud 386 is provided on the cross head 261) for urging the left end of lever 378 downwardly at the bottom of the nailing stroke. This downward movement of the left end of lever 378 opens the microswitch 376 to cut the air supply to the air motors 264 and 266 in a manner presently to be described. Microswitch 376 is later reclosed by means of a retaining bar 388 which slidably passes through the table 14 and terminates in a bent over portion 394. The upper end of the retaining bar 388 terminates in a bent over portion 390 which passes through the lever 378.
As long as the cross head 200 is in its at-rest position and the table 14 is in its raised position the left end of lever 378 is in its upward position as a` result of the action of the retaining bar 388 on the previous drop of the table 14. Microswitch 376 is thus in a closed position. When the cross head 200 goes through its nailing cycle and is raised and then depressed, the lug 386 strikes the left end of lever 378 at the bottom of the nailing cycle and opens the switch 376. In a manner to be presently explained the table 14 then drops and the retaining rod 388 pulls the right end of lever 378 downwardly to allow microswitch 376 to close and remain closed in readiness for another nailing cycle. The length of retaining bar 388 is so adjusted that the right end of lever 378 is allowed to remain in its raised position until table 14 has dropped suiciently so that cam 94 no longer depresses microswitches 96, 98 and 100.
As may be seen in Figure l the nailing machine is provided with a conventional nailing pedal 480 which, according to the invention, is actuated by means of an air cylinder 402 which is in turn controlled by means of a solenoid actuated valve 404.
Referring now to Figure ll there is shown a diagrammatic picturization of the wiring of the various microswitches and solenoids which control the strapping machine of this invention. There it Will be seen that the air motors 264 and 266 are connected by means of air supply pipes 280, 281 and 282, 233 to the solenoid valves 284 and 286 respectively. The solenoid valves are of the type which open the air valve when the current is on and close the air valve when the current is ott and are further of the two-way type in that they are operable either to feed air supply through conduits 281 and 282 to rotate the air motors in a forward direction or through conduits 283 and 284 to operate the motors in a reverse direction.
The motors are operated in a forward direction upon the energization of connections 406 and 488 which are connected together and to a common connection 410. The connection 410 in turn is connected to a switch 412 in a timer 414 and the other side of the switch 412 is connected by means of a lead 416 to the microswitches 224 and 372 which join one line 418 of a source of current supply. A pair of terminals 42() and 422 for operating the air motors 264 and 266 in the reverse direc- V tion for retracting strapping are connected through microswitches 96 and 98 to a common connection 424. The lead 424 goes through the microswitch 376 to the supply line 418. Each of the microswitches 96 and 98 is paralleled by a manual switch 426 and 428 which make it possible to manually operate the air motors 264 and 266 in a reverse direction to manually retract strapping from the guides 118 and 120.
The common connections 430 and 432 of solenoids 234 and 286 are connected through manual switches 434 8 and 436 to the other supply line 440. Thus energization of the leads 420 and 422 will cause the air motors 264 and 266 to feed strapping into the guides 11S and 120 while energization of the connections 406 and 488 will cause the air motors to retract strapping from the guides.
The timer 414 is provided with a running winding 442 which is connected to the lead 416 and to a lead 444 which connects to the supply lead 440. The timer 414 is thus energized as long as microswitches 372 and 224 are closed and the switch 412 is closed for the predetermined time set on the timer.
The solenoid 404 which controls the air supply to the piston 402 for actuating the nailing pedal 400, is connected by means of lead 444 to supply :line 448 and by means of a lead 446 to the microswitch 108. The microswitch 160 is in turn connected by means of lead 448 to the microswitch 376 and thence to the supply line 418. The nailing pedal 400 is of the conventional type utilized on nailing machines and will cause the nailing machine to continue to nail as long as it is depressed. A nailing operation is consequently instituted When both microswitches 100 and 376 are in an on position and is terminated when switch 376 is opened by the nailing stroke so that only one nailing operation takes place.
The table lifting cylinders 48 and 50 receive their air supply from a solenoid actuated valve 56. While the solenoid valves 284 and 286 were of the type which open while the current is on and automatically close when the current is cut olf, the solenoid valve 56 is of a different type which opens with a pulse of current and remains open even though this current is removed. The valve is subsequently closed by means of a pulse of current to a second winding which can only be elective if the current to the first winding has first been removed. The solenoid 56 thus has a pair of opening terminals 45t! and 452 and a pair of closing terminals 456 and 458. One opening terminal 450 is connected through lead 454 to the supply line 440 and the other opening terminal 452 is connected to microswitch 370 and thence to microswitch 102 and to supply line 418.
The winding for closing the valves has a pair of terminals 456 and 458, one of which is connected through lead 460 to the supply line 440 and the other of which is connected through lead 462 to microswitch 374 and thence to supply line 418. The valve is thus opened to cause lifting of the table when both microswitches 102 and 370 are closed and this circuit is opened to prepare the valve for lowering of the table when microswitch 102 opens in a manner to be presently described. The lowering operation is caused by a pulse of power to the terminals 456 and 458 through the microswitch 374 as that switch is momentarily closed by the cross head 200 at the bottom of the nailing stroke.
The pistons 331 which depress the hold down pins are connected by means of conduits 361 and 362 to the conduit 82 which leads to the valve 72. An inlet conduit 80 supplies air to the valve 72 which is mechanically operated by the bar 68 on the bracket 64.
The solenoid actuated valve 366 which controls the finger strap guide cylinder 364 is of the same type as solenoid 56, in that the valve opens upon receiving a pulse of current and remains open until a pulse of current in a further winding causes it to close. The piston 362 is held in a distended position by the spring 363 as long as the solenoid valve is closed.' The solenoid 366 is provided with a pair of leads 470 and 472 for closing the Valve 366 and allowing the spring 363 to distend the piston 362. The terminals 470 and 472 are connected respectively to solenoid microswitch 32 and thence to supply line 418 and to lead 474 and thence to supply line 440.
The solenoid winding for opening the valve 366 is provided With a pair of terminals 476 and 478 which are respectively connected to the microswitch 88 and thence to supply line 418 and to lead 480 and thence to supply line 440. Thus momentary closure of microswitch 32v by means of a cam section 482 on arm 24 causes the solenoid actuated valve 366 to close while momentary energization of microswitch 88 by means of nub 84 on bracket 64 causes the valve to open to retract the piston 362 and to move the finger strap guides into position.
The operation of the strapping machine is as follows: Assume that the machine is standing at an at-rest position with strapping in the guide 120 but with no box inserted. As a box is pushed into the guides 118 and 120 by the: operator it strikes the arms 22 and 24 forcing them outwardly and causing the cam section 482 on arm 24 to momentarily turn microswitch 32 on to thereby send a pulse of power to the closing winding (terminals 470 and 472) of solenoid actuated valve 366. This causes the valve 366 to close and allows the spring 363 to extend the piston 362 to remove the finger strap guides 212, 214, 216, 217 and 219 from the strapping guides 118 and 120.
As the piston 362 reaches its extended position and the linger strap guides are removed from the tracks, the bracket 356 strikes the button on microswitch 370 to close that switch in the raising circuit of solenoid actuated valve 56 (terminals 458 and 452). The table at this time is in its lowered position thereby depressing the button on microswitch 102 and closing that switch (as may be seen in Figure l) to complete a circuit to the opening winding on solenoid actuated valve 56 through lead 454 to terminal 450 and from terminal 452 through microswitches 370 and 102.
As the table rises it opens microswitch 102 so that the solenoid actuated valve 56 is in readiness to receive a pulse in its closing winding to close the valve and permit the table to drop. The rising table also carries the bracket 64 upwardly and bar 68 is removed from the lever 70 on the valve '72. Spring 78 urges this valve to an open position, admitting air to the hold down pin cylinders 331 which then force levers 334 and pin 228 downwardly as may be seen in Figure 8. The lowered pins 228 force the strapping 210 downwardly into engagement with the rising box top, thereby clamping the loose end of the strap to the box top to permit tensioning by the air motors.
The rising motion of the table further causes microswitches 96, 98, 100 to be closed by means of the cam 94, as may be seen in Figures 1 and 2. The microswitches 96 and 98 located beneath the table V14, Figures 1 and 2, are in the circuits of the reverse or strap retracting windings of the solenoid actuated valves 284 and 286 and are connected in series with lever actuated microswitch 376, Figure 10. Microswitch 376 is closed due to the actions of the retaining bar 388 in lowering the right end of the lever 378 during the previous fall of the table.
Power is thus applied to solenoids 284 and 286 through microswitches 376, 96 and 98 to cause the air motors to withdraw strap from the guides 118 and 120 to tension the strap around the box now in position. The free end of the strapping 210 is at that time held firm by means of the hold down pins 228 which depress the strapping against the box top. lt will be seen that the hold down pins exercise some strap anchoring function the minute that the box top engages the underside of the strapping, but that the hold down pins do not exercise a maximum strap anchoring force until the box is near its uppermost position.
Microswitch 100, also in series with microswitch 376, controls the current to the solenoid actuated valve 404 to admit air to the cylinder 402 to depress the nailing pedal 400 thereby causing the nailing machine to nail. Depression of nailing pedal 400 causes the nailing beams 192, 194, 196 and 198 to first rise and then come downwardly in the conventional manner. During the time that the nailing bars are rising, the air motors 264 and 266 complete the strap tensioning operation so that the strap is completely tensioned by the time that the nailing beams commence their downward stroke. Where the 10 source of motive power is not vsufficiently fast to complete the tensioning operation with this short period of time it may be necessary to utilize a timer to delay the nailing stroke until after the tensioning is complete.
During the tensioning step the air motors rapidly retract strap from the guides 118 and 120 and then stall when the slack has been removed. No excessive power is utilized in this stalled position and no overload or heating of the air motors occurs. While certain types of electrical motors are available which may be stalledy without any deleterious effects, these motors to date have been relatively expensive.` While such specially designed motors may be used in the strapping machine of this invention air motors are to be preferred because of their greater ruggedness, simplicity, durability and low cost. Conventional motors used in the manner of the invention rapidly overheat and consume extremely large amounts of power rendering them unsuitable.
As the nailing beams move downwardly in their nailing stroke, the lug 262 on nailing beam 194 engages the collar 258 on rod 246 to force the guillotine knife 242 downwardly over the anvil block 204 to sever the strap 210.
The downward motion of the nailing beams 192 through 198 is caused by the cross head 200 and as the cross head itself moves downwardly it closes microswitch 374, best seen in Figure l, to send a momentary pulse of power to the valve closing winding (terminals 456 and 458) of solenoid actuated valve 56 to remove the supply of air to the lifting cylinders 48 and 58 and to allow the table 14 to rapidly drop.
The downward movement of the cross head 200 also causes the lug'386, best seen in Figure 10, to depress the left end of lever 378 causing the right end of the lever to rise and open the microswitch 376. This breaks the supply of current to the solenoid 404 controlling the nailing pedal actuating cylinder 402, and also breaks the supply of current to the reverse windings of the solenoids 284 and 286 so that the air motors 264 and 266 come to rest. The size of the lug 386 and the spacing of the lever 378 from the lug 386 must be properly proportioned so that the air to the air motors is cut off prior to the time that the guillotine knife 242 severs the strap 210, in order to prevent the air motors from snatching the severed strap out of the guides. Momentarily breaking the power to the solenoid 404 actuating the nailing pedal cylinder 402 prevents the nailing machine from cycling more than once.
As has been set out, the downward motion of the cross head 200 momentarily closes microswitch 374 sending a flash of current to the solenoid S6 to cause a rapid dropping of the table 14. As the table 14 drops it engages the bent portion 294 of retaining bar 388 to pull the right end of lever 378 downwardly to allow microswitch 376 to close until the next downward movement of the nailing head 200 on the next nailing cycle.
As the table 14 drops the bar 68 on bracket 64 again engages lever 70 on valve 72 to shut off the supply of air to the pistons 331 actuating the hold down pins 228. These pins are then raised by the springs 232.
The dropping table also causes nub 84, Figure l, to strike lever to momentarily close microswitch 88 to send a pulse of current to the solenoid actuated valve 366 (terminals 476 and 478) to cause the piston 362 to move inwardly thereby moving the finger strap guides 342 into position in the strapping guides 118 and 120. When the piston 362 is in its retracted position the bracket 356 engages microswitch 372 which is in series with microswitch 224 and is connected in one lead to the timer 414.
The microswitch 224, best seen in Figure 4, is normally in a closed position and is opened by means of lever 218 when the free end of the strap 210 strikes the lever 218 upon completing its circle around the guides 118 and 120. When the microswitch 372 is closed by means of the finger strap guides moving into position, the microswitch 224 is also closed since there is no strap in the guides 118 and 120. This energizes the timer 414 closing the timer switch 412 and this supplies power to the forward or feed-windings (terminals 406 and 408) of the solenoid actuated valves 284 and 286 for the air motors 264 and 266. The air motors thereupon feed strapping into the guides 118 and 120 and the strapping upon completing the circle strikes the lever 218 opening microswitch 224 to remove power from the solenoid actuated valves 284 and 286 (terminals 406 and`408), thereby stopping the air motors. The momentum of the motors causes the free end of the strapping 210 to move past the lever 218 so that the desired overlap of strapping is obtained. Y
The timer 414 is utilized as a safety device to take care of the situation which might occur were the strapping to jump the tracks 118 and 120 and not trip the lever 218 and microswitch 224. In this circumstance the air motors would continue to feed strapping until a workman noticed that something was wrong. The timer 414 maintains the switch 412 in a closed position for a preset period of time which isso adjusted as to allow the strapping to hit the lever 218. Thus, if the strapping does jump the track the timer 414 will stop the air motors 264 and 266 shortly after the end of the strapping reaches the position adjacent the lever 218.
The strapping machine is now in its original position and is ready to receive another box to institute another cycle of operation.
It will be apparent from the foregoing that an inexpensive strapping machine has been provided which is foolproof and adapted to be applied to most conventional nailing machines. An air powered strap feed is utilized in a manner to eliminate complex and costly electrical feeds and this same feed is employed to tension the strap through a simple reversal of the motors without the need for expensive and complex clutching arrangements. In addition the strapping is secured by a nailing of the overlapped ends without the necessity of complex sealing or tying means and without the necessity of using a strapping guide having a gap therein.
While a specic embodiment of the invention has been shown it will be understood that this has been by way of illustration only and is not to be deemed limiting in any sense, the inventionbeing limited solely by the spirit and terms of the appended claims. In particular the illustrated placement of the various microswitches is illustrative only and it will be obvious to those skilled in the art that equivalent placements would be equally effeclong as they are responsive to the same movement or occurrence in the cycle of operation. The nailing machine depicted is also illustrative and any equivalent nailing machine may be utilized.
I claim:
l. In a strapping machine, the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, feeding means for feeding a length of strap into the frame with overlapping portions, said feeding means including a drive Wheel continuously rotationally locked to an air motor, means for clamping said strap against said object to allow tensioning of said strap, means for reversing said air motor to tension said strap and to cause said air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the air supply to said air motor, said drive wheel remaining in continuous driving engagement with said strap through an entire cycle of operation.
2. In a strapping machine, the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, said feeding means including a source of motive power capable of stalling Without overheating, means for causing said supporting means to rise, means for clamping said strap against said object to allow tensioning of said strap, saidA clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to cause said source of motive power to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the energy supply to said source of motive power.
3. In a strapping machine, the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions and including an air motor, means for causing said supporting means to rise, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to causesaid air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the air supply to said air motor.
4. In a strapping machine, the combination of; means for supporting the object to be strapped, an unbroken strap guide frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, said feeding means including an air motor, means for causing said supporting means to rise incident to insertion of an object into said frame, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to cause said air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, and means operable incident to said nailing to remove the air Supply to said air motor.
5. in a strapping machine, the combination of; means for supporting the object to be strapped, an unbroken frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, finger strap guides movable into and out of said frame, means for moving said finger strap guides, means for feeding a length of strap into the frame with overlapped portions incident to movement of said finger strap guides into said frame, means causing said finger strap guides to be withdrawn from said frame incident to insertion of an object into said frame, means causing said supporting means to rise incident to Withdrawal of said finger strap guides, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to vthe rise of said supporting means,` means operable incident to said rise of said supporting means for causing said feeding means to tension said strap, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap, means operable incident to nailing to cause said supportingmeans to fall, means Y 13 operable incident to said fall of said supporting means to cause said nger strap guides to move into said frame, and means operable incident to said movement of said linger strap guides to cause said feeding means to feed strap into said frame.
6. In a strapping machine, the combination of; means for supporting the object to be strapped, an unbroken frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, nger strap guides movable into and out of said frame, means for moving said finger strap guides, means for feeding a length of strap into the frame with overlapped portions incident to movement of said finger strap guides into said frame, said feeding means including an air motor, means causing said nger strap guides to be withdrawn from said frame incident to insertion of an object into said frame, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap and to cause said air motor to stall, means for nailing said overlapping portions to said object, means operable incident to said nailing to sever said strap and to cut the air supply to said air motor, means operable incident to nailing to cause said supporting means to fall, means operable incident to said fall of said supporting means to cause said linger strap guides to move into said frame, and means operable incident to said movement of said finger strap guides to cause said feeding means to feed strap into said frame.
7. In a strapping machine, the combination of; means for supporting the object to be strapped, a continuous strap guide frame disposed around the object, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, means for causing said supporting means to rise, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap, means for nailing said overlapping portions to said objects, and means operable incident to said nailing to sever said strap.
8. In a strapping machine, the combination of; means for supporting the object to be strapped, an unbroken strap guide frame adjacent said supporting means, said supporting means being vertically movable with respect to said frame, means for feeding a length of strap into the frame with overlapping portions, means for causing said supporting means to rise incident to insertion of an object into said frame, means for clamping said strap against said object to allow tensioning of said strap, said clamping means being operable incident to the rise of said -supporting means, means operable incident to said rise of said supporting means for causing said feeding means to tension said strap, means for nailing said overlapping portions to said object, and means operable incident to said nailing to sever said strap.
References Cited in the file of this patent UNITED STATES PATENTS 1,230,989 Bluege June 26, 1917 1,436,293 Ripley Nov. 21, 1922 1,650,843 McChesney Nov. 29, 1927 1,937,675 Twomley Dec. 5, 1933 2,644,944 KQtt July 14, 1953
US452556A 1954-08-27 1954-08-27 Strapping machine Expired - Lifetime US2781516A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179037A (en) * 1961-11-27 1965-04-20 Warrenton Marine Services Inc Preformed loop type binding machine
US20060266230A1 (en) * 2005-05-24 2006-11-30 Vereschagin Lawrence W Automatic banding device and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1230989A (en) * 1916-09-11 1917-06-26 Adam Bluege Hooping or strapping attachment for box-nailing machines.
US1436293A (en) * 1921-01-03 1922-11-21 Ripley David William Box-strapping machine
US1650843A (en) * 1918-08-08 1927-11-29 Cary Mfg Co Wire-banding machine
US1937675A (en) * 1932-02-02 1933-12-05 Clara B Parker Box strapping machine
US2644944A (en) * 1948-07-09 1953-07-14 Automatic Nailing Machinery Co Means for strapping boxes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1230989A (en) * 1916-09-11 1917-06-26 Adam Bluege Hooping or strapping attachment for box-nailing machines.
US1650843A (en) * 1918-08-08 1927-11-29 Cary Mfg Co Wire-banding machine
US1436293A (en) * 1921-01-03 1922-11-21 Ripley David William Box-strapping machine
US1937675A (en) * 1932-02-02 1933-12-05 Clara B Parker Box strapping machine
US2644944A (en) * 1948-07-09 1953-07-14 Automatic Nailing Machinery Co Means for strapping boxes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179037A (en) * 1961-11-27 1965-04-20 Warrenton Marine Services Inc Preformed loop type binding machine
US20060266230A1 (en) * 2005-05-24 2006-11-30 Vereschagin Lawrence W Automatic banding device and method
US7644484B2 (en) 2005-05-24 2010-01-12 Lawrence Wayne Vereschagin Method of manufacturing a band with a fastener

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