US2800997A

US2800997A - Nail machine

Info

Publication number: US2800997A
Application number: US543351A
Authority: US
Inventors: John H Friedman
Original assignee: National Machinery Co
Current assignee: National Machinery Co
Priority date: 1952-09-19
Filing date: 1955-10-28
Publication date: 1957-07-30
Anticipated expiration: 1974-07-30

Description

y 1957 J. H. FRIEDMAN 2,800,997

' NAIL MACHINE Original Filed Sept. 19. 1952 4 Sheets-Sheet 1 J. H. FRIEDMAN 2,800,997

NAIL MACHINE July 50, 1957 Original Filed Sept. 19. 1952 4 Sheets-Slieet 2 INVENTOR. JOHN H-FE/EDMA/V BY 4 78/015): WA 775, EDGE/FTOARNFNEMY) m/afom; 4i

J. H. FRIEDMAN NAIL MACHINE July 30, 1957 4 Sheets-Sheet 3 Original Filed Sept. 19. 1952 dnw - IIIIIII J lllllll- :ZJUHJIIIII INVEN TOR. JOHN FRIEDMAN BY 78/6/15); w 775, soamro/vaflsuimm 'July so, 1957 Original Filed Sept. 19, 1952 J. H. FRlEDMAN 2,800,997

NAIL MACHINE 4 Sfiets-Sheet 4 III "II IN V EN TOR. JOHN H FIE/EDNA Arm/e EYS Hired state Original application Septernher 19, 1952, Serial No. 319,461. Divided and this application @ctober 28, 1955, Serial No. 543,351

Claims. (Cl. 283-16) This invention relates to a machine for making nails and, more particularly, to that machine wherein wire stock is progressively advanced by the stock gripping dies, headed and further advanced and cut and ejected from the machine. Reference is made to my copending application, Ser. No. 310,461, filed September 19, 1952, of which the instant application is a division.

Among the objects of my present invention is to provide a nail machine having a feed mechanism which will automatically be stopped in the event that stock should be jammed in the grip dies.

It is a further object of my invention to provide a quill means sensitive to the wire means to stop the machine upon jamming of the wire stock.

Further objects and advantages of my construction will appear as the detailed description of my invention proceeds and with the explanation of the appended drawings wherein:

Fig. 1 shows the nail machine in its entirety;

Fig. 2 is a perspective view of a portion of the feed mechanism with the stock gripping members in a restricting position;

Fig. 3 is a perspective similar to Fig. 2 with the stock gripper mechanism advanced;

Fig. 4 is a perspective view of the feed apparatus illus trated in Figs. 2 and 3 showing the operation of the safety device in the event of a jam in the machine;

Fig. 5 is a sectional end view taken at 55 of Fig. 4;

Fig. 6 is an elevation view showing the actuating mechanism for the stock grippers; and

Fig. 7 is a plan view with parts in section showing the safety shut-01f.

For a general understanding of the construction and operation of the mechanism of the nail machine, reference may be had to Fig. 1 wherein the nail machine 5 is mounted on a base 6 and is provided at the left hand side thereof with a discharge chute 7 which terminates above an inclined conveyor belt 8. A supply of wire stock is illustrated as at 9 and is preferably supported on a base mechanism 1-0 which advances the wire stock to the machine according to the tension therein reflected by the tension in the stock 11. The stock nail support for advancing the wire stock to the machine and the conveyor 3 for conveying finished nails away from the machine form noessential part of the invention and are therefore not described here in detail.

A control box 12 carrying suitable starting and stopping switches is mounted on the machine in a position convenient to the operator. T he machine is preferably driven by an electric motor on the right (not shown), which is belted or otherwise operatively connected to the fly wheel 13 at the left hand side of the machine. The said mechanism for intermittently advancing the wire stock 11 is indicated in its entirety as at 14, and, as will be understood by those skilled in the art, a reciprocating header slide is driven by a crank shaft which header slide upsets a head on the end of the wire stock within the machine. The stock is thereafter advanced by the feed mechanism atent into alignment with cooperating cutters for cutting the wire stock and at the same time forming a point by the cutting operation after which the nail is ejected. For a more detailed description of the operation of the nail machine, reference is made to my copending application, Ser. No. 310,461, filed September 19, 1952.

The wire stock is intermittently advanced into the machine by means of a come-along feed mechanism wherein a reciprocating come-along carriage, indicated in its entirety as at 21) in Figs. 2 and 6 grips the wire stock and moves it forward through the die breast a predetermined amount and then returns again to grip the wire stock and carry it forward.

Straightening rollers 68 are carried by the nail machine to straighten the wire stock 11 as it is unrolled from the reel 9. To facilitate the starting of a supply of wire into the feed mechanism, certain of the rolls 68 are adapted to be moved away from other rolls by the operation of the lever 68a. V forms no essential part of the present invention and other types of stock straightening devices may be substitutedfor that shown herein.

The wire stock being advanced into the machine is indicated as at 22 in Figs. 2, 3, 4 and 5. The carriage 2b is reciprocated within a housing 14 which is provided be;

tween bed frame 5 and a top wall 23. The carriage is provided with

rollers

24 and 24 which bear against the top wall 23 of the housing and on the return of the carriage the downward separation force between gear segment 26 and rack 27 forces the rollers to ride on

tracks

28 and 29 spaced from the lower portion of the rollers with track 28 being mounted on frame 5 and track 29 being mounted on removable cover 39.

it will be noted that the left hand end of the oscillating shaft 31 has keyed thereto a depending gear sector 26 which projected downwardly through a slot in the upper wall 23 and meshes with a rack v27 carried by car riage 26. complete cycle of oscillation of the come-along feed which is characterized by a quick advance toward the die breast and slow return wherein the carriage moves freely with respect to the wire stock on the return and which.

to Fig. 6. Pivoted as at 43 in the carriage 2% is a bar 44 which carries a hardened steel block 45 adapted to engage the underside of the wire stock to be advanced. A cooperating hardened steel block 46 is carried in the carriage The pivoted proper immediately above the block 45. bar 44 rides during the reciprocation of the carriage, on a roller 47 which is exposed through a slot 4%.

To move the roller 47 in a vertical direction and thus apply gripping pressure across the blocks 45 and 46, the roller 47 is pivoted on an arm 49 of a bell crank 50. The

bell crank is urged about its pivot 51 in a clockwise direction by means of a spring 52 pulling on rod 53 pivoted to the lower end of the bell crank as at 54. To intermittently release the gripping effect across the blocks 45 and 46, a cam is arranged to bear against the roller 55 mounted on the lower arm of the bell crank 50. The cam 54 is rotated by shaft 56 and has high and low areas arranged so that as the come-along carriage 20 advances the spring 52 is effective to grip the stock and thus carry the wire stock into the machine. Similarly, the high portions of cam 54 release the spring pressure and thus the gripping pressure on the stock when the comealong carriage 20 is being retracted along the stock. The drive for the stock feed is fully disclosed in my co-" Patented July 30, 1957- The stock straightening apparatus shown Thus, by each revolution of the crank shaft, a:

pendingzapplic'ation, Ser. "No. 310,461, filed September 19, 195 2, and need notbe 'furtherexplained here.

In the event of a jam of the wire stock in the grip dies oran undue restraint imposed upon the advance of the wire sjtock-inthe die 'breast, the machine according to m inventionj is immediately stopped. The means for accomplishing this stoppingof the 'machine is 'best'illustrated in Fig. 7.

fis seen' in Fig. 7,-aquill 34 is shown mounted in bore 33 of frame 5. The wire stock22 is fed into the'nail machine through aligned openings through the bed frame 5,- the die breast 61 and the die breast wedge 60. As illustrated in Fig. -7, the Wedge'GO-maybe adjusted trans- I versely of the die breast-61 to determine theposition 'of the breast-with respect to the headerslide 62 for the headingr'op'eration. It will be understood 'that when a nail is cut a portionof the wire "stock=projeets 'beyond'the die breast "and suchprojeeting portion: is thereafter'upset bythe header slide '62 to form'theheadfor "the next nail. Cutterbars-fil'rand '64 are shown in'engagement 'with the wire stock at knife 65.} The cutter bars 63 and '64 are actuated by

toggle links

66 and 67 in timed relation with header slide 62 as set out in 'my copending application, S'er.No. 31'0,4'6l,filed September "19, "1 952. ."Inthe event ofajam in the wire stock in the clie breast'or an undue restraint imposed upon the advance 'of wire stock inthe die breast the quill is actuated to 'stop the machine, as set out hereunder. The bed frame :'5"in alignment with the stock feed is 'provided with an enlarged bore 33 and slidably mounted in this bore is a stock guide quill '34. A'spring '3'5'is arranged within the bore '33 so as 'toabut against an annular shoulder on the outside of quill 34 and thus, the quill is urged longitudinally of the bore 33in a direction opposite "to the direction of the stock feed within the quill. An annular groove 36 is provided :in the 'quill and a'pivoted pin 37 has one 'endthei'eof riding in the groove 36 of the quill. The pin'l37"is enlarged as at 38 at its 'mideportion so that it may rock or pivot in. the 'transversebore '39 formed in *the bed frame. The

other end of the'rocking'pin 37 bears against a longi- 'tudinally disposed -pin 40-and saidf'lastnamedpin in turn is operatively engaged with the-actuating-member '41 of a micro-switch'42. The last mentioned switch'is'in a relay circuit controlling the main motor for the machine so that,' when the relay circuit is opened by movement of the switch member 41, the main motor 'forthe machine is .deenergized.

In 'Fig. 4 I have illustrated the effect upon'the 'wire stock 22 when the stock is jammed in the die breast or in the "grip dies of the machine. Since the stock is restrained from further advance through the die'breast, the advancing motion of the come-along feed mechanism 20 will'cause the wire stock to bend the loop as shown at 22a in Fig. 4, and further causes the'loop "to move the, quill 34 inwardly of the machine against the action'of the spring 35. The last described movement of the quill effects a rocking of the pin -37 and thus, the actuation of the switch 42 'to stop the machine. This safety feature is particularly important where a number of machines arehandled by a single operator. Normally, the machine requires noattention by the operator except t o'rcnew the stock-coil 9, but-it is desirableto stop the machine as soon 'as there is a jam, to prevent further advance of the stock. 7

'Although I'have described one form of my invention in considerable detail, it will be appreciated by those skilled in the art that numerous modifications may be made therein without departing from the scope *ofthe invention as defined in the following claims. j

l. A:safety device for a nail machine of the type havingfeeding means to intermittently advance wire stock into the machine comprising a bed frame provided with a cylindrical bore to receive the stock'being fed, a tubular s lidahly mounted in the bore, said quill having a flange at the stock entrance end thereof projecting beyond the cylindrical bore in -the bed frame, said quill having a recess adjacent the flange, spring means surrounding said quill within the bore and arranged to bias the quill in a direction opposite the direction of the movement of the stock being fed into ;the quill, means'to limit the axial sliding movement of the quill within the bore comprising a rocking pin disposed transversely of the quill, .said rocking pin having one'end portion extending into said .recess on the quill, a switch for stopping :the nail machine and means operably connecting the other end of said rocking pin and said switch whereby movement of the quill against the bias of said spring rocks said pin'and stops the machine.

2. Safety stop mechanism for a nail machine of the type having stock feed means to intermittently advance wire stock into the nail machine comprising a die breast having a cylindrical bore to receive wire stock advanced into the machine, a wedge block backing up "said die breast, said wedge block being'provided with a bore in alignment with the bore in the die 'breast,'abore in said bed frame coaxial with said first *two bores, -'said 'lastnamed bore having a sleeve fixed therein, a tubular'quill mounted for sliding movement in said sleeve, =sa.id quill having a flange at the outerend thereof projecting 'beyond the bore formed in the bed frame, said-quill having an annular shoulder fitting within'the'bore 'andspring means interposed between said shoulder'and'said sleeve to normally urge the quill in a direction'opposite thedirection of feed of the wire stock into the machine, a-stop switch, a rocking pin mounted in the bed frame transversely "of the bore having one end thereof projecting into said bore to engage the quill and the other end "thereof operably connected to said stop switch whereby'inthe event wire stock is-jammed within the'machine the wire stock being fed to the quill buckles to move the quill and rock said pin to operate the switch and 'stop themachine. I I

'3. A'safety stop mechanism for a nail-making machine 7 of the type having stock feed meanstointermittentlyadvance wire stock into the nail machine, a die breast having a cylindrical bore to receive wire 'stock advanced into the machine, said stockfeed means beingpositioned and arranged intsuch manner as to move the wire stock through said die breast a predetermined amount and then return again to grip the wire'stock and'move it forward, a bore in said bed frame coaxial with said bore, said last name'd bore having a sleeve 'fixed'therein, .a tubular quill mounted for sliding movement'in said sleeve, said quill 'having an annular shoulder fitting 'withinthe'b'ore and spring means interposed between said shoulder and said sleeve to normally urge the quill in a direction opposite the direction of feed of the wire stock .into the machine, .a stop switch, a rocking pinmounted in the bed frame transversely of the bore havingone end'thereof projecting into said bore to engage 'the quill and the other end thereof operably connected to said stop switch, whereby in the event wire stock isjammed within the die breast, the wire stock "being fed to the quill buckles,

due to the advancing motion of said wire stock advancing meansforrning a loop moving said quill inwardly of the machine against the biasing action of said spring, whereupon said pin is rocked causing said pinto operate said stop switch and thereby stop saidmachine.

4. A safety stop mechanism for a nail-making machine of the type having stock feed means to intermittently advance wire stock into the. nail machine including grip jecting beyond the bore formed in the bed frame, said quill also having an annular shoulder fitting within the bore and spring means interposed between said shoulder and said sleeve to normally urge the quill in a direction opposite the direction of feed of the wire stock into the machine, a stop switch, a rocking pin mounted in the bed frame transversely of the bore having one end thereof projecting into said bore to engage the quill and the other end thereof operably connected to said stop switch, whereby in the event Wire stock is jammed within the die breast or said gripping dies are unduly restrained the wire stock being fed to the quill buckles due to the advancing motion of said means for advancing wire stock forming a loop moving said quill inwardly of the machine against the biasing action of said spring, whereupon said pin is rocked causing said pin to operate said stop switch and stop said machine.

57 A safety stop mechanism for a nail-making machine of the type having stock feed means to intermittently advance wire stock into the nail machine, a die breast having a cylindrical bore to receive wire stock advanced into the machine, a Wedge block backing up said die breast, said wedge block being provided with a bore in alignment with the bore in the die breast, said stock feed means being positioned and arranged in such manner as to move the wire stock through said die breast a predetermined amount and then return again to grip the wire stock and move it forward, a bore in said bed frame coaxial with said bores, said last-named bore having a sleeve fixed therein, a quill mounted for sliding movement in said sleeve, said quill having an annular shoulder fitting within the bore and biasing means interposed between said shoulder and said sleeve normally biasing the quill in a direction opposite the direction of feed of the wire stock into the machine, a stop switch, a rocking pin mounted in the bed frame having one end thereof projecting into said bore to engage the quill and the other end thereof operably connected to said stop switch whereby in the event wire stock is jammed within the die breast the wire stock being fed to the quill buckles, due to the advancing motion of said means for advancing wire stock forming a loop moving said quill inwardly of the machine against the biasing action of said spring, whereupon said pin is rocked causing said pin to operate said stop switch and stop said machine.

References Cited in the file of this patent UNITED STATES PATENTS 518,500 Guttin Apr. 17, 1894 1,117,489 Hathaway Nov. 17, 1914 2,698,081 Rice Dec. 28, 1954 2,716,781 Elliott et al Sept. 6, 1955