US1874575A - Grid winding machine - Google Patents

Description

Aug. 3; 1932.

J. A. MORlcK ET AL GRID WINDING MACHINE Filed March 19, 1930 5 Sheets-Sheet 1 BY nwawu $m-r-mg ATTORNEYS Aug, 3Q, P1932. J. A. MORECK ET AL.

GRID WINDING MACHINE Filed March 19, 1930 5 Sheets-Sheet 2 Aug. 356, 1932. J. A. MORICK ET AL GRID WINDING MACHINE Filed March 19, 1930- 5 Sheets-Sheet 3 as p in /h P. Jwc7/150/7 W4, Liv/WM ATTORN EY$ 9 11932 .3. A. MORICK ET AL 1,82%,575

GRID WINDING MACHINE Filed March 19, 1930 5 Sheets-Sheet 4 ATTO R N EYS Aug. 30, 1932. J. AJMoRlcK ET AL 1,874,575

GRID WINDING MACHINE Filed March 19. 1930 5 Sheets-Sheet 5 ATTORN EYS The object of the invention generally is a Patented Aug. 30, i

UNITED STATES PATENT OFFICE JOSEPH A. HORICK, 0F KENILWOBTH, AND KENNETH P. SWAN SON, OF IRVINGTON, NEW

JERSEY, ASSIGNOBS TO EISLER ELECTRIC QORPORATION, OF NEWARK, NEW JER- SEY, A CORPORATION OF- DELAWARE GRID WINDING MACHINE Application fled larch 19, 1980. Serial No. 487,159.

This invention relates to the manufacture of radio tubes and the like and particularly to parts thereof, such for example as grid or resistance elements.

machine for the manufacture of grids and resistance elements which is characterized by its simplicity in construction and reliabillty in operation and by the uniformity of the .10 product obtained. A further object of the invention is a novel machine of this character which automatically feeds the grid support wire, winds the grid resistance wire thereabout and imbeds it into the support wire and forms the same into the desired grid lengths.

- A further object of the invention is a novel feeding mechanism for effecting a uniform positive feed of the support wire, this feeding mechanism being further characterized by its simplicity in construction and operation. A further object of the invention is amachine of the above indicated character including novel means for winding the grid wire about the support or sup orts and imbedding the same therein. A urther object is a novel combined support wire, feeding mechanism and grid wire windin and imbedding mechanism. A further ob ect is a novel machine of this character for forming a continuously wound grid stock with the grid wire imbedded at intervals only and then severing the imbedded parts from each other to form the grid lengths. A further object of the invention is a novel means for severing the wound grid support wire into the desired grid lengths for commercial use. A further object of the invention is a machine capable of manufacturing either of the several types of grids which are used in radio tubes, the change froin one type of grid to another merely requiring a change in the mandrel. A further object of the inventidn is a machine of the above indicated character characterized by the uniformly good quality of grids produced with a minimum of defective grids.

For a better understanding of the above indicated and other features of the invention which will hereinafter appear reference may be had to the accompanying drawings illus- Fi 2 %ig. 4 is a section along the line 4-4 of ig. 5 is an enlarged sectional view through the revolving head and feed mechanism with certain parts removed,

5a is a view of a formed grid, Fig. 6 is a diagrammatic view illustrating the feeding of the support wireand the 'imbedding of the grid wire therein,

Fig. 7 is an enlarged detailed view of a id support wire with the grid wire imberil ed therein,

Fig. 8 is a section through a modified mandrel and mandrel support,

Fig. 8a is a view of a finished grid,

Fig. 9 is an end view thereof, and

Fig. 10 is a view showing the circular path of the grooving and crimping devices.

Referring to the drawings the machine is mounted on a suitable table or base 1, the latter being carried by the frame 2. Sup orted upon the table or base 1 is a machine ase 3 which carries the several mechanisms of the machme. Y

A main drive shaft is indicated at 4 and is journalled in suitable bearings 5, the latter, as indicated, being supported upon the machine base 3. A revolving head 6 is journalle'd above the shaft 4 for rotation about an axis parallel thereto. This revolving head carries the grid wire reel 7 and the wire imbedding mechanism, to be described,'and imbeds the grid wire in the support wire 8 which is being fed thereto from the reel or reels 9. A cutting mechanism indicated generally by the numeral 10 severs wound grids to the desired lengths. The shaft 4 is driven from a power shaft 11, the latter being journa-lled below the table 1 and driven in any suitable manner, the shafts 4 and 11 being geared together by a sprocket chain drive 12. The revolving head 6 isdriven from the drive shaft 4 b means ofa sprocket chain drive indicated y the numeral 13. The bearings 5 for the main drive shaft 4 and the bearings 14 for the revolving head 6 are su rted by the bearing blocks 15, 15, suita e ari caps 16 being provided for the upper parts t ereof.

As indicated above the support wire 8 is automatically fed from the reel or reels 9 to the head 6 where the grid wire from the reel 7 is wound about the support wire and is imbedded therein at each turn or half turn depending upon whether the single support or double support grid is employed. The automatic feed mechanism for the support wire 8 includes a horizontally disposed guide member 17 which is fixedly carried by one of the bifurcated parts 18 of the bearing block 15, the guide member 17 being carried in any suitable manner thereby, as for example bein disposed at one end in a recess formed in t e upper part of 18 with a closing ca or clamp 19 detachably secured thereto. it the other end, member 17 passes through the sleeve-like bearing 14 of the head 6 and is provided with grooves 20 on either side thereof for guiding the support wire 8. .The guide member 17 passes entirely through one of the sleeve-like bearings in the head 6 and the overhangin end 17 carries a mandrel support 21. T e mandrel support 21 carries, preferably formed as a part thereof. a mandrel 22 and this mandrel 22 is provided on one edge with a guide groove 23 which forms a continuation of or is in alinement with the guide groove 20 of the member 17, a recess 21' being provided in the mandrel support 21 through which the support wire 8 passes on its way into the groove 23 of the mandrel. The rotating head 6 carries a feeding sleeve 25, the latter rotating with the head 6 and functioning to feed the support wire forward at a predetermined rate. This is accomplished by forming the interior of the sleeve 25 with a spiral ed or feeding screw thread 26 which engages e wire 8 disposed in the feeding ve of the guide member 17 to positively feed the same. This internal screw thread 26 is indicated on an enlarged scale in Fi 6 and it is observed that the spiral threa or edge bites orcuts into the exposed side of the support wire 8 as indicated at 27 and accordingly there can be noslippage or lost feed motion. That part of the Ii guide groove passing through the feed sleeve 25 is desi ated by the numeral 20 and it is observe that this groove is of less depth than the diameter of the wire in order to leave an exposed edge for the feeding sleeve to engage. Preferably tubes 8' are disposed in the grooves 20 for guiding and keeping the wire 8 in a straight path, the wire being threaded into i the outer end of the tube. There are two reels 9 indicated in the drawings providing for the manufacture of both the single and double support 'ds. These reels are carried in any suita le manner, as for example by the arms 28 adjustabl carried at 29 by the machine base 3. e wire 8 upon leaving the reels 9 is directed to the tubes disposed' in the groove or grooves 20 of the guide member 1 by means of the guide members 30 which are carried by the bearing block 15. A sleeve 33 is indicated as being fitted into and rotating with the hub sleeve within the bearing 14.

At 31 is illustrated a container for a special cleaning and treating liquid which is supplied to the rotating ceding sleeve 25, this container 31 having a supply pipe 32 passing into the bearing 14 and connecting with a passage 32 leading down throu h the sleeve 35 and sleeve 33 to one end of t e feed sleeve 25 to the feed screw threads 26, the passage 32 connecting with the pipe 32 at each revolution and thereby collecting a small quantity of fluid. Carbon tetra-chloride has been found to be a very satisfactory liquid for this purpose, in that it effectively maintains the screw threads clear of metallic filings and particles, the latter being continually removed by the carbon tetra-chloride. This enables the positive screw feeding mechanism to operate indefinitely without necessity for cleaning.

The mandrel 22 is for the manufacture of the single support round grid and for this purpose it is made circular and around this the grid wire is wound and imbedded in the sup rt wire 8 at each turn. The roove 23 is 0 less depth than the diameter 0 the su port wire 8 in order that one edge may e ex for the purpose of imbedding the grid wire. The revolving head 6 includes two hub sleeves 35 which are journalled in the bearings 14 at the upper ends of the bearin blocks 15, each of these sleeves being provi ed with four spokes or radial arms 36 with opposed spokes or arms being bridged by membeis 36', this whole structure preferably being formed as a single integral piece, as for example of a single casting. This head carries within the bridging members 36' a bell crank lever having a long arm 38 and a shorter arm 39, the lever being carried by a cross pin 40 which is carried .by and bridges two of the arms 36 of the hub structures. The lever is adjustable along the crosspin or ivot 40 b means of a nut 41 screw threa edly attached to the pin which nut engages one side of the bell crank lever, while the other side of the bell crank lever is engaged b a coil spring 42 which permits but yielding y holds the lever in its operative position against the nut 41. The short arm 39 of the lever carries cutting or grooving and crimping knives 43 and 44 respectively, these being of circular formation and being carried by a pintle 45 which in turn formed with the hub part 44 and surround ing the pintle 45. A spacing disc 47 is disposed between the knives 43 and 44 and a tightening nut 48 engages the screw threaded sleeve 46 and firmly holdsthe knives together as a rigid structure. The cutting knife 43 is provided with a cuttingior grooving edge 43', while the crimping nife 44 is provided with a crimping or brading edge The cutting knife unit is adjustable radially by means of the pivoted rod connection 50 engaging the outer end of the lever arm 38 at one end and being pivotally connected with the bolt 51 which is carried by one of the bridging members 36' of the head. The rod or pin is pivoted for move ments in a plane at right angles to the axis of rotation of the headland is provided at its free end with an adjusting nut 52 with a coil spring 53 surrounding the rod or pin 50 and engaging at one end a shoulder 54 on the rod 50 with the other end of the spring engaging the end of the lever 38. By adjusting the nut 52 the cutting and crimping unit may be adjusted to the exact position desired to nick and crimp the Wire 8 at each revolution, this nicking and crimping being effected against the tension of the spring 53 and the latter being of sufficient tension to effect the cutting or nicking and crimping operations. There is sufficient side play in the pintle connection 50 with the lever 38 to take care of the necessary adjustments.

The grid wire is carried, as indicated above, by the reel 7, and the latter is carried by one of the bridging or cross pieces 36 of the head through the intermediary of an arm 56, the latter having an axle 57 for the reel while a spring 58 enga ing the fastening nut 59 on one end and t e reel 7 on the other maintains the desired frictional engagement to provide against overrunning of the reel. The reel carrying arm 56 also carries a guide pulley 60 for the grid wire 7' for directing the same to a guidin needle 61. This guiding needle 61 is carried by a pivoted arm 62, the latter being pivoted at 63 to a lug fastened to a spoke 36 and being engaged by a set screw 64 for setting the needle 61 at the desired point for proper feeding of the grid wire. A coil spring 65 is rovided on the opposite side of the pivot point 63 between a part 'of the rotating head and the arm 62'for yieldingly holding the arm 62 in engagement with the set screw. The needle 61 is normally set in a position in a plane midway between the cutting and i nouns in the articular embodicrimping knives 43, 44 so as to position the id wire in a groove just previously formed y the cutting knife 43 in, reparation for the crimping operation 'per ormed by the knife 44 at the next revolution of the head. The cutting knife 43 is preferably adjusted with reference to the feeding mechanism 25 to form the grid wire grooves between the grooves 27 formed by the spiral screw threads 26, although fairly good results may be obtained even though the grooves 27 and thenicks formed by the cutting knife 43 become coincident.

In order to provide for ready removal of the surplus grid wire at the ends of the sev- 'ered grids it is desired that the crimping operation be discontinued at regular intervals, these intervals depending, of course, upon the type and character of grid desired. For this purpose means are provided for throwing the guiding needle 61 out of this normal position so as to shift the grid wire to a point intermediate the nicks formed by the cutting knife whereby the crimping knife 44 merely crimps or brads the nick without imbedding the wire during these intervals. For this purpose the arm 62 carrying the guiding needle 61 is provided with an offset portion or finger 67 which is arranged to be automatically engaged by a cam mechanism at each revolution so as to shift the arm 62 about its pivot 63 and thereby to shift the needle 61 out of its normal feeding path. This cam mechanism is in duplicate on opposite sides of the machine both mechanisms i being operative when a double support grid is being formed, while only one of them, of course, is efiective while the single support grid is being formed. The mechanisms being duplicates only one will be described. It includes a counter shaft 70 journalled in bearing blocks 71. This shaft carries a cam 72 which is adapted to engage a lever 73 pivoted at 74 upon a bracket 75 projecting from a bearing block 15. A bell crank lever 76 is pivoted at 74 alongside of lever 73 and is in the form of a cam surface which is actuated to a position in the path of the arm or finger 67 of the needle carrying arm 62 during a certain period at each revolution of the counter shaft 70. The active part of the cam 72 is indicated at 72 and during the time that this part 7 2' is in engagement with the end of the lever 73 the cam surface 76 is in position to engage the finger 67 at each revolution to shift the grid wire from the imbedding groove. Each of the bell crank levers 76 includes an oifset arm 78 and a set screw 79 carried thereby and adjustably engaging the lever 73 while a spring 80 is fastened to one end of the arm 78 and to a fixed part of the frame for yieldingly holding the arm 78 in its adjusted position against the lever 73. The cam 72 is adjustable as to the width of the active part of the 4 assure cam 72'1and for this purpose it is aplit into vided to compensate for the slight side movetwo parts and these two parts are a justably ments of the shaft 99. The shaft 99 is liftfastened together by the screws 81 passing through arcuate ooves 82. With the ad- 'ustment indicate in Fi 4 the active part 2' is the narrowest widt obtainable by the construction shown. The shaft 70, of course rotates at a slow speed and any suitable reduction gearing between the drive shaft 4 and the shafts 70 may be utilized. In the particular embodiment herein shown this reduction gearing drive includes a pawl and ratchet mechanism comprising a pawl 85 carried by an eccentric 86 on the shaft 4 and a ratchet wheel 87 carried by the shaft 70. A spring 88 maintains the pawl 85 in engagement with the ratchet wheel 87 Whlle a dog 89 prevents backward rotation of the shaft when the pawl recedes.

The grid indicated by the numeral 90 continues through the machine after the grid winding and imbedding operations, the feeding mechanism effecting this continuous feed. The grid 90 being formed eccentrically of the axis of rotation of the head it is fed forward as indicated in the dot and dash lines in Fig. 5 and is engaged and guided to a central axial position by a iding member or sleeve 91 which is fixe ly carried by a a support 92 mounted on the left end bearing block 15, this guide sleeve 91 projectin through the left end part of the hub an having a conical interior guide surface, as indicated, for gradually bringing the grid 35 stock to the central axial position before it is fed to the cutting mechanism 10. This cutting mechanism 10 includes an upper knife 93 and slower knife 94, these knives being carried by racks 93 and 94 which are reciprocably mounted in the frame support 95. Coil springs 96 are disposed between the reciprocable frames of the two cutting knives and around pins 97 carried by the knife 93 and movable in corresponding guide sockets formed in the rack member 94', these springs normally maintaining the knives 93 and 94 separated from each other and in a position to permit the grid to be fed forwardly therebetween. The two racks 93 and 94 are geared together by a gear 98 to provide for opposite and simultaneous reciprocating movements. The actuating mechanism for the cutting knives includes a ver tically reciprocable shaft 99 which is pivotally carried at its upper end by means of the lever arm 100 which in turn is pivotally carried by one of the shafts 70 while the' lower end of the shaft 99 is fastened by means of a power tension spring 101 to a frame member 102 fastened to the under side' of the table 1. An adjusting nut-screw device 103 is provided for adjusting the tension of the spring. The shaft 99 passes through registering openings in the table 1 and the machine base 3, suflicient play being proed against the tension of spring 101 by means of a rotating cam 104 which is carried by one of the shafts-70, this cam engaging the end 105 of the lever 100. This cam 104 has a sudden drop 104 which permits the toe 105 to drop abruptly downwardly under the influence of the s rin 101 to actuate the cutting knives. 'lhe the shaft 99 is communicated to the cutting knives by means of a pivoted latch 106 depending downwardly from the rack 93' and a lug 107 which is carried b the shaft 99 and engages the latch 106 to ring the rack 93' downwardly with the shaft 99 actuated by the spring 101. The latch 106 is automatically released, however, at the proper time during the downward movement to arrest the movement of the knives, this taking place when the knives 93, 94 come together to sever the grid. The releasing mechanism includes a tripping or cam finger 108 which is disposed in the path of the pivoted latch 106 and engages the cam surface 109 formed in the under side of this latch thereby causing the latch 106 to be actuated to the dotted lines shown out of the path of the actuating lug 107 and thereby permitting the further downward movement of the shaft 99 without actuating the cutting knives and permitting the latter to be returned to the normal position under the influence of the springs 96. The adjustment is preferably such as to sever the grids midway of the non-imbedded lengths thereof whereupon the loosely wound surplus grid wire 7 may be readily removed by ulling it off.

F ig. 50 indicates a form of grid made with the use of the mandrel 22, namely, a sin 1e support grid and also the mandrel 22 is circular so that a circular grid is thereby formed. In Fi 8 and 9, however there is shown a man rel for use in making the double support wire grid shown in Fig. 80.. Here the mandrel support is indicated at 110 and is ada ted to be secured to the overhanging end 17 of the guide member 17. The mandrel proper is indicated at 111 and is rovided with a groove 112 on either edge or the reception of a support wire which is being fed thereto. The mandrel is indicated as bemg of flat form to produce the flat 'd of Fig. 8a. In Fig. 10 is indicated the pat of the grooving an crimping knives around about the mandrel 22, the guide needle 61, of course, being carried by the rotating head and following also a circular path. When a double support grid is to be formed, as for example with the mandrel 111, the cutting and crimping knives 43 and 44 would engage both the support wires at each revolution and in succession. The full line position of the cuttingland crimping knives of Fig. 10 indicates t e engagement with one support wire ownward movement of 7 III while the dot and dash position indicates the engagement of the other support wire of a double support grid.

At 113 is indicated a chute disposed adjacent the cuttin mechanism 10 for receiving the severed grids and leading them to a suitable receptacle 114 carried by the table 1.

The operation of the machine is clear from the above description. With the support wire 8 threaded through the groove 20 and engaged by the feedin sleeve and the cutting and crimping ives and guiding needle suitably adjusted, the machine will operate automatically with no special attention required from the operator, the severed gric 5' being ready for mounting in radio tubes except for the removal of the loose grid wire 7 wound around the ends of the grids and, as indicated above, any of the several different types of grids may be made with e ual facility upon this machine. A particu arly uniform product is obtained, and the machine is observed to be of simple constructionand operation. We claim:

1. In a machine of the character set forth the combination of means for winding grid wire about and fastening it to a wire support,

with means for positively feeding the wire support including a guide member and groove for the wire support, and a relatively rotatable screw feeding device engaging the wire in said groove and gradually feeding it forward to the winding and fastening means, and means separate from the screw feeding device for forming grooves in said wire support for the reception of the grid wire.

2. In a machine of the character set forth the combination of a grid mandrel and means for winding grid wire about said mandrel, with means for positively feedin a wire grid sup. ort wire to said mandrei including a gui e member having a groove therein for guiding the wire and a screw feeding means engaging and biting into the grid support wire for gradually feedingit forwardly in said groove to the winding mechanism, and means separate from the screw feeding device for forming grooves in said wire support for V the reception of the grid wire.

3. In a machine of the character set forth the combination of means for supplying and winding a grid wire about a grid mandrel with a screw feeding device directly engaging and feeding a grid support wire gradually to the grid wire supply mechanism, and means for forming grooves between the bites of the screwlfeeding device for the reception of the grid wire.

4. In a machine of the character set forth a positive wire feeding means including a guide member with a guide groove therein for the wire and a screw thread feeding device co-operating with said guide member and engaging and biting into the wire disposed in said groove to gradually feed it forward, said screw feedin device and said means being relatively rotatable and means or forming grooves between the bites of the screw feeding device for the reception of the grid wire.

5. In a machine of the character set forth a grid mandrel, relatively rotatable means for winding wire about sa1d mandrel, means for fastening the grid wire and means for shifting the wire at intervals to the fastening and unfastenin positions.

6. In a machlne of the character set forth a mandrel relatively rotatable means for winding wire about said mandrel means for fastening said wire when fed to the mandrel in a predetermined plane and means for shift ing the wire to another plane at intervals in order to interrupt the fastening operations.

7. In a machine of the character set forth, the combination of a mandrel, means for feeding a grid support wire thereto and for winding grid wire about said support wire, means for fastenin the grid wire to the support wire when the grid wire is fedin one position and means for shifting the grid wire feed to another position at intervals in order to obtain a grid having grid wire continuously wound 'thereabout but fastened thereto and unfa'smember at intervals to shift it relatively to,

the mandrel.

9. In a machine of the character set forth the combination of a mandrel, a screw feeding device in advance of the mandrel for biting into and feeding a grid support thereto, means for forming spaced grooves in said support wire between the bites of the feeding device as it is moved past the mandrel, means for windin and layinggrid wire in said grooves an means for crimping said grooves after the grid wire is laid therein.

10. In a machine of the character set forth the combination of a mandrel, means in advance of the mandrel for feeding a grid support wire thereto, means for formingspaced grooves in said support wire as it is fed past the mandrel, means for winding and laying grid wire in said grooves and means for crimping said grooves after the grid wire is laid therein, the grooving and crimping mechanisms being mounted upon a rotating head and including a unitary circular knife and a circular crimping disc which yieldingly engage the support wire disposed in the mana crimping knife mounted as a unit for yielding engagement with the wire being operated u on.

12. In a machine of the character set forth the combination of a mandrel, means in advance of the mandrel for feeding a grid support wire thereto, means for formings aced grooves in said support wire as it is e past the mandrel, means for winding and laying grid wire in said grooves an means for crimping said ooves after the id wire is laid therein t e groovin' an crimping mechanisms being mounte upon a rotating head and including a unitary circular knife and a circular crimping disc which yieldingly engage the support wire disposed in the mandrel as the head rotates, said circular knife and crimping disc being spaced longitudinally of the grid support wire a distance equal to two imbedding grooves together with a grid wire feeding means adapted to feed the grid wire to the mandrel at a point intermediate the circular knife and crimping disc.

13. In a machine of the character set forth the combination of a mandrel, means in advance of the mandrel for feeding a grid support wire thereto, means for forming spaced grooves in said support wire as it is fed past the mandrel, means for winding and laying grid wire in said grooves and means for crimping said grooves after the grid wire is laid therein, wherein the grooving and crimping mechanisms being mounted upon a rotating head and including a circular knife and a circular crimping disc which yieldingly engage the support wire disposed in the mandrel as the head rotates, said circular knife and crimping dis'c being spaced longitudinally of the grid support wire a distance equal to two imbedding grooves, together with a grid wire feeding device adapted to feed the grid wire to the mandrel at a int intermediate the circular knife and crimping disc, and means for shifting the wire grid feeding device from the centrally disposed position at intervals.

14. In a machine of the character set forth, the combination of means for winding grid wire about and fastening it to a wire support, with means for positively feeding the wire support including a guide member and groove for the wire support, and a relatively rotatable screw feeding device engaging the wire in said groove and gradually feeding it forward to the winding and fastening means,

the grooves in the support wire being formed intermediate the points of engagement of the screw feeding device for the reception of the grid wire and a device for crimping said intermediate grooves after laying of the wire therein.

15. In a machine of the character set forth the combination of means for winding grid wire about and fastening it to a wire support,

with means for positively feeding the wire su rt includin a 'de member and e for the wi e su ii rt, and a relativerotatable screw fe mg device engaging the wire in said groove and gradually ee ing it forward to the winding and fasten ng means, the grid wire winding and fastening and grooving mechanism including a rotating head surrounding the grid mandrel and including a device for cuttin grooves in the support wire as it is advance a guiding device for guiding grid wire to the grooves after they are formed and a crimping device for crimping the'grooves after the wire is laid therein, the grooving device forming the grid wiregrooves intermediate the points of engagement of the screw feed with the support 16. A machine of the character set forth in claim 5 including a grid severing mechanism operated in timed relation with the windin and fastening mechanisms to sever the gri s at points intermediate the grid wire fastened parts thereof.

17 In a machine of the character set forth the combination of a grid mandrel, a grid support wire carried b said mandrel and having one edge thereo ex osed, a rotating head, a circular grooving evice and a circular crimping device carried by said head and yieldingly held in the path of the exposed edge of said support wire as the head rotates t e same therepast and a grid wire reel carried by said head together with guiding means for winding grid wire about the mandrel, the grooving and crimping devices being carried on one arm of a bell crank lever, fihiladother arm of said lever being yieldingly 18. In a machine of the character set forth, the combination of a. rid mandrel, a grid support wire carried said mandrel and having one edge thereo ex osed, a rotating head, a circular grooving evice and a circular crimping device carried by said head and yieldingly held in the path of the exposed no edge of said support wire as the head rotates the same therepast and a rid wire reel carried by said head to t or with guiding means for winding gri wire about the mandrel, the grid wire guiding means including a pivoted guiding needle which is adjustably mounted on the head.

19. In a. machine of the character set forth, a drive shaft, a rotating head, a grid mandrel, means for feeding and guiding a grid wire support to said mandrel, means on the rotating head for winding the id wire about said mandrel and about sai sup ort wire, and means in substantially axial a inement with the axis of rotation of the rotat- 1 ing head for severing the wound support wire into predetermined lengths, the rotating head carrying means for forming grooves in the support wire for the grid wire, and other means for crimping the grooves with the grid wire positioned therein, with grid wire guiding means being adjustable to two positions and means for moving the guiding means from one position to another including a rotating cam operated by the drive shaft, and an intermediate actuating device operable to a position in the path of a device connected with the guiding means.

20. In a machine of the character set forth, a drive shaft, a rotating head, a grid mandrel, means for feeding and guiding a grid wire support to said mandrel, means on the rotating head for winding the grid wire about said mandrel and about said support wire, and means in substantially axial alinement with the axis of rotation of the rotating head for severing the wound supportwire into predetermined lengths, the rotating head carrying means for forming grooves in the support wire for the grid wire, and othermeans for crimping the grooves with the grid wire positioned therein, with grid wire guiding means being adjustable to two positions, and means for moving the guiding means from one position to another including a'rotating cam operated by the drive shaft, and an intermediate actuating device operable to a position in the path of a device connected with the guiding means, and said rotating cam being carried by a shaft which is operatively connected with the severing mechanism.

21. In a -machine of the character set forth a main drive shaft, a rotating head into the path of an actuating cam mounted above the drive shaft and rotatable on an axis parallel thereto, a grid mandrel operably associated with said rotating head, a guide having a groove for guiding grid support wire, a rotating screw feed sleeve engaging the support wire in said groove and advancing it through said mandrel at a predetermined rate, grooving and crimping knives carried by said rotating head and engaging the support wire in the grid as the same is carried therepast, grid wire feeding and windin means carried by'said rotating head 'inclu leading the gnd wire to a groove previously formed by t e grooving knife, said guiding needle having an operative part projecting device, a counter shaft geared down from the main drive shaft and carrying a cam, operatin connections between the rotating cam an the actuating cam device including a system of levers for periodically shifting the grid wire guidin needle to one side, a severing mechanism or severing the wound grids to predetermined lengths, and means for operating said drive s aft.

mg a pivoted guiding needle.

23. In a machine of the character set forth a grid severing mechanism including a pair of reciprocable knives geared together 'for op osite movements, spring means normally ho ding the knives separated, and an actuating mechanism operating in opposition to the spring means including a power tension spring, a reciprocable power shaft connected at one end thereto, means for periodically actuating said shaft against the tension of the power spring and operative connections between the power shaft and the reciprocable knives which are operative on the power stroke of the shaft.

24. A machine of the character set forth in claim 23 wherein the operative connections between the shaft and the severing knives include a pivoted latch and a co-operating actuating lug, with means for disengaging the lug and the latch at the end of the severing operation.

25. In a machine of the character set forth, the combination of a stationary mandrel with a groove therein for guiding wire support, means for advancing said wire support comprising a rotating screw device engaging and iting into said wire support, a rotating head rotating about said mandrel and comprising means for winding grid wire about said wire supportand separate means for imbedding the grid wire into said wire support as the rotating head revolves, means for severing said wire support with the grid wire wound about and fastened thereto into predetermined lengths and-means between said severing mechanism and the mandrel for engaging and centering the wire support with the grids mounted thereon.

26. A machine of the character set forth comprising means for winding grid wire about wire support and fastening the same thereto, means for severing said wire su port into individual predetermined lengt s and a device comprising a cam surface dispose vbetween the severin mechanism and the grid wire winding an fastening mechanism for guiding the grid wire to the severing mechanism.

27. A machine of the character set forth in claim 26 wherein the ding device is in the form of a sleeve wit a conical interior.

In'testimony whereof, we havesigned our names to this specification.

JOSEPH A. MORICK.

KENNETH P.- SWANSON.

22. A machine of the character setforth in claim 5 including a severing mechanism operating in timed relation with the machme for severing the wound grids at the unfastened positions of the grid

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