US1384870A - Heeling-machine - Google Patents

Description

.I. F. STANDISH.

HEELING MACHINE.

APPLICATION FILED MAR. 1B. 1918.

5 SHEETS-SHEET l- J. F. STANDISH.

HEELING MACHINE.

APPLICA'HON FILED MAR. I8, 1918.

1,384,700 Patented July 19, 1921.,

5 SHEETS-SHEET 2- J. F. STANDISH.

HEELING MACHINE- APPLICATION FILED MAR. 18, I918.

.1, 4 7 Patented July 19, 19215 5 SHEETS-SHEET 3- Q. I l 2:: m:

2 a VZ/WJAY. l flnmmlmuk My J. F. STANDISH.

HEELING MACHINE.

APPLICATION FILED MAR. 18, 1918.

Patented July 19, 19219 '5 SHEETS-SHEET J. F. STANDISH.

HEELING MACHINE.

APPLICATION FILED MAR. 18, 1918.

Patented July 119 1921.

5 SHEETSSHEET 5- rric.

JOHN F. STANDISH, OF WINTHROIE, lLCASSACI-IUSETTS, ASSIGNOB, TO UNITED SHOE MACHINERY CORPORATION, OF EATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

HEELING-IVIACHINE.

i senate.

Specification of Letters Patent.

Patented July 19, 1921..

To all whom it may concern Be it known that 1, Joan F. STANDISH, a citizen of the United States, residing at VVinthrop, in the county of Suffolk and State of Massachusetts, have invented certain Iniprovcments in lleeling-lilachines, of which the following desorption in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to heeling machines one is directed more particularly to improvements in the pressure mechanism of machines of the type illustrated by Letters Patent No. SSshlii, granted April 14, 1908, upon the application of Benjamin F. Mayo, although it will be apparent that various features of the invention are not limited in their utility to embodiment in this particular type of machine but are equally appliable to hecling machines of other types.

The general object of the invention is to improve and simplify the construction of healing machines in such respects as to permit them to be run very rapidly with a minimum of shock and wear upon the parts and at the same time to produce work of the highest quality.

The machine disclosed in the Mayo patent .aboi'e referred to has been very successful,

connnercially, and many hundreds of them are in use in shoe factories. In that maohine. however, the pressure applied to the workbehirc and during the driving of the attachin nails is transmitted through heavy spring at the sides of the machine. This pressure increases in a predetermined ratio as the nails are being driven, and the mode of application of the pressure cannot be alto, suit the requirements of various i-lasscs of work. Consequently, the pressure is applied in exactly the same way whether the heels are high or low or whether they are soft or hard.

cstnother ditiiculty which has been encountered in the use of the machine referred to occurs when the pressure is being. released from the shoe. heavilv (OHlPIQSSGll during thenail driving operation, and as soon as the crank has passed dead center the springs expand very suddenly, causing the crank shaft to run The side springs are very ahead of the balance wheel, this being possible by reason of the fact that the driving power is transmitted from the balance wheel to the crank shaft through a Horton clutch. This sudden movement causes considerable shock to the machine, frequently sufficient to interfere with the proper working of the nail distributer and sometimes even sufficient to throw the top lift out of the top lift holder. Furthermore, it is necessary to use a very powerful brake on the crank shaft to insure that it shall stop at the right point. This brake, being applied continuously, absorbs a great deal of power and its parts wear away rapidly.

With these conditions in view, an important feature of the present invention consists in the elimination from the pressure mechanism of a lieeling machine of the usual springs and the provision of pressure transmitting means, preferably frictionally operated, which will not cause a rebound when the driving crank passes its dead center point. With this arrangement, the pressure may be applied in the same way as in the earlier machine, but. released more gradually, with the consequent elimination of the objectionable shock, and means, constituting a further feature of the invention, may be associated with the friction pressure applying mechanism for permitting preliminary adjustments to determine how the pressure shall be applied. lf'a preferred form of the invention, provision is made for either applying the pressure in a progressively increasing degree as the nails are driven, or, as is desirable in some classes of work, applying initially practically the entire amount of pressure and then maintaining the pressure substantially constant throughout the nail driving operation. This result may be advantageously accomplished by the provision of means for progressively increasing the friction in the pressure transmitting devices, constructed and arranged for adjustment to vary the rapidity with whichthe friction is increased, or even to maintain the friction constant throughout the period of pressure application. This means may conveniently take the form of a cam arranged to control the frictional mechanism, and, preferably, adjustable to cause an increase in the friction in said mechanism or to causeit to remain constant while the pressure is being applied to the work. The frictional power transmitting connections or devices may in clude a friction drum and a band surroundmg and bearing uponthe drum, the arrangement being such that the ad ustable cam previously referred to, operates tocontral:

the pressure of the band upon'the drum. One end of the band may be anchored, while the other is yieldingly drawn in the direction of rotation of the drum when applying 'ing pressure to the work may thus be transmitted whlle an undue absorption of power 7 and wearing of the parts is avoided in the idle return stroke.

In accordance witha further feature of the invention, the friction controlling cam may be thrown out of operation entirely,.the band 1 upon the friction drum being solely under the influence of a spring, the tension of which may be adjusted, but which is normally constant in the operation of the machine. In this connection an important feature consists in the particular arrangementof the friction band in its relation to the drum. One end of the band is anchored at a point which is stationary relatively to the axis of the drum while the other end is secured under tension in a yielding manner, with the result that rotation of the drum in one direction'tends to draw the band closely into engagement with it, producing a substantial degree of friction, while reverse rotation of the drum causes the other end of the band'to yield and the amount of friction to be reduced.

A still'further feature of the invention consists in the provision of automatic means for ad ustably determining the initial relaously in the holes in the nailing die, and this 7 adjustment provides for varying the depth of the holesto suit nails of different lengths without varying the amount of the nail which shall be left projecting from. the

heel when the heelis attached. I have met 7 this condition by providing adjustable stops for variably limiting the return movement of the die, 1n combination wlth a lost motion connection between the drivers and the die,

so constructedand arranged that the actuation of the drivers may be positive, but the die is permitted to stop at any desired point in its return stroke.

In another of its aspects, the invention relates to the provision of improved means for controlling the relative approach of the jack and nailing die of a heeling'machine in the successive operations of attaching a heel to a shoe and applying a top lift to the attached heel. In the machine of the Mayo patent previously referred to, the thickness of the top lift and the so-called spanking plate upon which it is supported, is compensated for by automatically operated toggle mechanism which is shown and described in de tail in Letters Patent No. 446,383, granted Feb. 10, 1891, upon the application of C. IV. Glidden and A. D. Elliott. Inthat machine, the shifting of the toggle at the back of the machine to compensate for the top lift and spanking plate is effected automatically upon the downward movement ofthenailing die and drivers and operates upon the jack and its supporting mechanism. The parts which are moved are quite heavy, and the sudden movement in shifting the jack from heel attaching to top lift spanking position, or vice versa, jars the entiremachine to an objectionable extent. A feature of the present invention consists in the provision of means for eliminating the sudden movement of these heavy masses of metal with the consequent vibration or jarring of the machine, and the entire compensating mechanism is greatly simplified in operation and cheapened' in cost of construction- In acv cordance with this feature of the invention, the pressure applying member which is moved to compensate for the thickness of the top lift and spanking plate-in the present example the nailing diehas imparted to it a movement to oneextent for applying pressure to the work during theheel attaching operation and to another extent for ap plying the pressure during the top lift spanking operation. This'inember may be driven by power means having an invariable stroke with the provision of automatic mechanism interposed between the power means and the pressnre'applying member for varying the amount of movement of the said member. In the. embodiment of the invention hereinafter described and illustrated in the acocmpanying drawings, a lost motion connection is provided between the driver toggle and the nailing die in combination with means for eliminating the lost motion in alternate cycles of operation. This lastmentioned means may convenientlyjconsist of an oscillatingpressure supporting member having steps of different height and operated by a cam upon'one of the toggle members. In this connectioma further fea ture of the invention consists in the proing mechanism out of action, and giving the pressure applying members a uniform stroke for every operation when it is desired to use the machlne for surface nailing.

These and other features of the invention will best be understood from the following detailed description of one embodiment thereof to be read in connection with the accompanying drawings, in which Figure 1 is a view in side elevation of a hceling machine embodying the invention;

Fig. 2 is a front elevation of the machine shown in Fig. 1;

Fig. 3- is a vertical, sectional view of the compensating mechanism;

Fig. el is a view in side elevatiom showing particularly the frictional power transmit-- ting connections in the pressure mechanism.

Figs. 5, G and '7 are perspective views of details of the compensating mechanism;

Figs. 8 and 9 are views in side elevation of the compensating mechanism showing it in the two extreme positions assumed during the heel attaching operation; and

Figs. 10 and 11 are similar views of the same mechanism in the corresponding positions assumed in the top lift spanking operation.

In the drawings 10 indicates the frame of a heeling Ineachine and 12 indicates the jacl: or shoe support which is normally stationary vertically, but, may be adjusted in accordance withthe thickness of the worn to he operated upon.

Power is furnished to the machine by a continuously running balance whee which is connected through the usual onerevolution Horton clutch with the crank shaft 16. The cranl shaft is connected by a connecting rod 18 to the center of a toggle comprising a linlr 20 pivoted at 22 to the machine frame. and a link 2%. pivoted at 26 to a spindle 28 which carries. at its upper end. a gang of nail drivers 30.

The nailing die is mounted in a die support 31- rigidly connected to the upper ends of a pair of upr' t rods The rods 36 are guidec for vertical movement in sleeves 38. the upper ends of which are secured by clamping members :0 to the driver head .2 carried at the upper end of the die bed spindle 28. llacl: teeth ell are formed in the rods 36 and punons iii nesh ingwith the racl: teeth are formed-upon shafts 4:8 to each of which is keyed a friction drum 50.

inasmuch as the two sides of the p essure applying mechanism are symmetrical with respect to each other. it will be sailicient to describe one of them in detail. flhe lower end of the rod 36 is reduced. as shown at and passes through a guiding bushing l. which is treaded to permit vertical adjustment in a bracket 56 secured to the machine frame by bolts 58. A set screw 60 is provided for securing the bushing in adjusted position. A washer 62 of yielding shock absorbing material surrounds the reduced portion of the rod, resting against the shoulder formed at the junction of the main portion 36 of the rod and its reduced portion 52.

The friction drum 50 is provided with flanges 6% for the purpose of maintaining in proper relation to the drum a friction hand 66, one end of which is anchored on a pin 68 mounted in a bracket '70, bolted to, or formed integrally with the sleevecasting 38. The anchor pin 68 located beneath, and substantially in vertical alinement with, the axis of the friction drum. The friction band 66 is lined with leather or other suitable friction material 72 and partially encircles the drum, engaging its periphery.

A bell crank lever 74 is pivoted at T6 to the rear end of the bracket 70, and a rod '78 attached to the free end of the friction band 66 passes loosely through a hole in the end of a forwardly extending arm 80 of the lever. A compression spring 82 surrounds the lower end of the rod 78 and the ends of the spring bear respectively against the end of the arm 80 and nut 8% threaded upon the lower end of the rod 78, by adjustment of which th tension of the spring may be varied. The end of a screw 86 passing through the lever arm 80 bears againstthe friction band where the latter surrounds the anchor pin 68. and this screw may be adjusted to Vary the limit of upward in rement of the arm.

The second arm 88 of the bell cranl: lever 74 extends downwardly and a roll 90 is mounted in its lower end. The roll is arranged to engage an adjustable cam. comprising a plate. 92 secured to the machine frame by screws 9% passing through slots 96 in the plate. and an angularly adjustable cam member 98 pivoted to the plate 92 by a screw 100 and secured in adjusted position by a belt 102 passing througl a slot l0l in the member 98 and threaded into the plate 92. It will be apparent that this construction provides for bodily adjustment of the entire cam structure vertically and inde pendent angular adjustment of the cam member 98 about the pivot 100. straight vertical surface, to be eng d by the roll 90, is formed upon the rear lace of the; cam plate 92 and a corresponding cam surface 108 is formed upon the rear face of the cam member 98. The lower end of the member 98 is formed as a pointer 110. cooperating w'th a graduated scale 112. the purose of which is to facilitate a like adjustn the cam members 98 upon the two sides of the machine. in order that the two friction bands 66 may be operated simultaneously in exactly the same way.

The mechanism for compensating for the thickness of the top lift and spanking plate will now be described, after which the operation of the machine will be described in proper sequence. As already stated, the conent of necting rod 18, which transmits motion from the crank shaft 16 to the toggle 20, 24, has an invariable movement and is connected to the center pivot 114 of the toggle. A rocker member 116 is rigidly secured to a rock shaft 1-18 by a pin 120 (see Fig. 5). The rock shaft 118 is mounted for oscillatory movement in the upper toggle link 24. A curved pressure supporting surface or step 122 is formed upon the rocker member 116, being arranged to engage a complemental curved surface 124 upon the lower face of a yoke 126, having a tongue and groove connection 128, by virtue of which the yoke is permitted to slide longitudinally in the upper end of the link 24. The curved surface 124 is formed on an inwardly extending portion 130,

I which also has formed in its upper face an extended bearing for the upper toggle pivot '26 (see Fig. By this arrangement a solid train of connections is secured for transmitting the necessarily great force to the nailing die and drivers;

A spring pressed plunger 132, located in a recess in the member 116 and bearing upon a rearwardly extending bracket 134 formed as a part of the toggle link 24 tends always to swing the member 116 forwardlyinto the position illustrated in Figs. 3, 4, 8' and 9. This is the position occupied by the parts during the operation ofdriving the nails to attach the heel to the shoe.

A screw 136 having its upper face curved to correspond to the surface 122 is threaded into the member 116, as shown clearly in Fig. 5. The-member 116 is splita-nd provided with a clamping bolt 138 for securing the screw 136 immovably in 'position when the desired vertical ad ustment of the screw has been secured. The function of the screw 136 is to transmit the working pressure when the top lift is being attached to the heel,fand it is normally so adjusted that its curved face is below the surface 122 by a distance equal tothe thickness of the toplift and the spanking plate interposed between the nail ing die and the heel. During the top lift spanking operation, the rocker member 116 occupies the angular position relativel to the toggle link 24, shown in. Figs. 10 a'nc 11. By virtue of a lost motion connection consiting of slots 146 in the upper end of the link '24 where the pin 26 passes through it, the pressure transmitting screw or step 136 is permitted to rise from the position shown in Fi 10 to that shown in Fig. 11 where the top of the screw engages and transmits pres- I sure to the member 136. ltwill be observed that the member 136, which is movable v loosely for a short distance vertically, acts member 116 from one position to the other the following mechanism is provided. A collar 142 is rigidly secured to the rock shaft 118, and the outer end of the shaft is re duced to form a trunnion for a hub 144 carrying an arm 146 provided at its outer end with a roll 148. Tongues 150formed on the end of the hub 144 are arranged to enter slots 154, in the collar 142. A spring 158 located in a recess in the hub and held in position by a washer 160 and nut 162 upon the end of the rocker shaft 118 tends to hold the hub in looking engagement with the collar, but permits the hub to be drawn out wardly and turned upon the shaft 118 into a different angular relation to the shaft, where the tongues 150 may enterthe slots 154 and lock the arm 146 in an inoperative position.

A cam member 164, having-three identical cam faces 166, is formed on the face of a disk 168 which is journaled to rotate on the end of the center-toggle pin 114. Ratchet recesses 170 are formed in-the innerface of the disk 168 and spring pressed pawls 1'72, 17 4 mounted respectively in the toggle links 24, 20 are arranged to engage in the recesses to rotate the disk and'cam relatively to the pin 114 when the toggle links are moved angularly relatively to each other. The spring pressed plunger 132 keeps the roll 148 in engagement with thecam 164 and it will thus be apparent that the cam constitutes controlling means for determining which of V the steps 122, 136 shall be in pressure transmitting relation to the member 130.

The operation of the above described ma chine is as follows: Assuming the machine to be in the position'of rest, as illustrated in Figs. 1 and 2, with the rocker member 116 in the position shown in Fig. 8, a load of shaft executes one revolution. Inasmuch as the stopping position of the crank 18 practically upon its rear dead center point, the first half of its revolution produces forward movementof the connecting rod 18 until the toggle 26, 24 is straightened. Assuming the position shown in Figs. 4 and 9, inasmuch as the high step 122 is under the pin 26, the

lost motion connection 140 is inoperative upon this stroke and the spindle 28 is given a positive upward movement throughout the entire period of the forward stroke of the connecting rod. The cam 98 may be so adjusted that the roll 90' is initially in engagement with, the straightawayportion of the plate 92, and the nut 84 adjusted to produce sufficient tension upon the spring 82 to draw the friction band 66 into engagement with the drum. 50, producing enough friction between the band and the drum to prevent r0 neeasvo tation of the drum until the nailing die encounters resistance to its upward movement. Under these conditions, the spindle 28 and driver head 42 will carry the side rods 36 and nailing die 32 upwardly until the heel upon the nailing die engages the shoe. At this point, the resistance of the shoe and heel to further upward movement of the nailing die will tend to cause the friction drum to be rotated by relative movement of the rack a4. and pinion 46. Such rotation of the friction drum will be resisted by the friction band 66 to an extent dependent upon the tension of the spring 82 and sutficiently to exert pressure upon the work dur ing the continued upward movement of the spindle 28.

At about the time when the heel engages the shoe, the roll 90 will begin to ride rear \vardly upon the inclined cam face 108, thereby progressively increasing the fric tion of the band 66 upon the drum 50 during the further upward movement of the spindle and consequently increasing progressively the pressure applied to the work while the nails are being driven. WVhen the resistance to the movement of the nailing die becomes sufficient, the drum 50 will slip in the band, and the drivers 30 will move upwardly through the nailing die, driving the attaching nails through the heel into the shoe.

As the connecting rod 18 starts upon its rearward stroke, the toggle 20, 24 is broken and the spindle 28 moves downwardly. The initial portion of this downward movement releases the pressure from the work and is unresisted until the washers 62 engage the upper ends of the bushings 54:, whereupon downward movement of the rods 36 and the nailing-die supported thereby is stopped and the continued descent of the spindle 28 with the driver head 42 and sleeves 38 carried thereby, will produce a reverse rotation of the friction drum 50 in a clockwise direction,

as viewed in Fig. 4. Prior to the engage ment of the washer 62 with the bushing 54, the roll 90 arrives upon the stra htaway portion of the plate 92, materially diminishing the tension upon the spring 82. Furthermore, the spring 82 is quite light and yields readily, with the result that frictional resistance to the rotation of the drum 50 in the direction in which it is moving at this time is very small. Thus an unnecessary absorption of power in restoring the parts to their initial positions is avoided.

During the breaking of the toggle 20, 2 1 and the downward movement of the spindle 28, the pawl 17% operates to rotate the disk 168 from the position shown in Figs. 8 and 9 to that shown in Figs. 10 and. 11, the roll 14:8 riding up on the face 166. The arm 146 is thus actuated automatically to swing the rocker member 116 from heel attaching to top lift attaching position, with the step 136 in alinement with the member 130.

In the next cycle of operation of the machine, the initial portionof the forward movement of the connecting rod 18 will be ineffective until the lost motion permitted by the slot 140 is taken up, and the step 136 engagesthe surface 124. In this cycle of the operation of the machine, therefore, the extent of upward movement of the spindle 28 will be less than that in the heel attaching operation by an amount equal to the difference in the heights of the twosteps 122 and 136,that is to say, by an amount sufficient to compensate for the added thickness of the top lift and spanking plate, introduced between the heel and the nailing die prior to the starting of the machine for the top lift spanking operation;

It will be apparent from the preceding detailed description of the mechanism of the machine that provision is made for adjustably varying the operation of the machine to suit all classes of work. By vertical adjustment of the cam plate 92, the point in the nail driving operation at which the roll 90 begins to ride upon the inclined cam face 108 may be varied to cause the progressive increase of pressure upon the work to begin at any desired time, and the swinging adjustment of the cam member 98 about the pivot 100 permits the rate of the progressive increase of the friction between the drum 50 and the band 66, and consequently the rate of progressive increase of pressure upon the work, to be varied, as desired. On the other hand, in some classes of work it may be desired to apply a certain amount of pressure to the work and to maintain that pressure constant throughout the nail driving operation. Under these conditions, the cam member 98 may be swung to the left, as seen in Fig. 1, until its face 108 is practically a continuation of the straightaway face of the plate 92, whereupon the friction inthe power transmitting connections will remain constant throughout the stroke of the spindle 28 but may be adjusted by turning the nut 84 to change the tension of the spring 82. If it be desired to produce greater fric- -tion than can be secured by adjustment of the nut 84 the screw 86 may be turned through the arm until the roll 90 is lifted away from its cam, whereupon a constant amount of friction will exist between the drum and band during the upward stroke. The amount of this friction, however, will be very much less on the return stroke by reason of the yielding of the spring 82, as previously described. p

The operation of the machine has been described above as it foccurs when attaching first a heel and then a top lift in so-called blind nailed work. In surface nailed work, however, the heel and top lift or the heel with the top lift previously attached to it is attached to the shoe by a single nailing with a single stroke of the spindle 28, and under. these circumstances alternate'move ments of the nailing die to different extents are not desired. To meet this condition, it is merely necessary to draw the hub 144 outwardly against the tension of the spring 158, turn it angularly forward until the tongues 150- 'are 7 in alinement with the grooves 154;, and release it, whereupon the arm 146' will be locked in an inoperative position in which the roll 148 will not be engaged by the cam 166. The spring pressed plunger 182' will now maintain the rocker member 116' continuously in heel attaching relation to the toggle, andvthe operation of the machine will proceed as with a simple toggle, a uniform stroke being imparted to the spindle 28 in successive cycles of operation.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a heeling machine, the combination of a work engaging member, power operated means for actuating the said member,-yielding power transmitting connections between the actuating meansand the member, and means for preliminarily adjusting the connections to transmit thepre'ssure in a variable manner during the application thereof.

2. In aheeling machine,,the combination of a work' engaging member, power operated means for actuating said member to apply pressure to the'work, yielding power transmitting connections between the actuating means and the member, and preliminarily adjustable means for varying during the apyielding connections.

3; In a heeling machine, the combination. a with a work engaging member, power means for actuating said member to apply pressure to the work, yielding friction power trans- 'means for actuating said member, frictional power transmitting connections between the actuating means and the member, and means for lnsuring a progressive increase of the friction insaid connections while the pressure is being applied to the work.

5. Ina heeling machine, the combination of a" work enga m'ng. member, power operated means for actuating said member to apply plication of pressure the resistance of said:

pressure to the work, frictional power transmitting connections between the actuating means and. the member, and controlling mechanism for the frictional means preliminarily adjustable at the will of the operator to cause the friction to be progressively increased or to remain constant, as desired, during the application of pressure to the worln 6, In a heeling machine, the combination of a work engaging member, power operated means for'actuating said member to apply pressure to the work, yielding power transmitting connections between the actuating means and. the member and controlling mechanism preliminarily adjustable at the will of the operator to modify the action of said yielding connections to cause the pressure either to be progressively increased or to remain constant throughout the period of its'application to the work. I 7, In a heeling machine, the combination of a. work engaging member, means for moving. said member. to apply pressure to the work, and frictional power transmitting mechanism between said means and member embodying a friction drum, a band bearing upon said drum, and means for keeping the band under tension.

7 8. In a heeling'macine, the/combination of a work engaging member, means for moving said member to apply pressure to the. work, and frictional power transmitting mechanism between said means and member embodying a friction drum, a bandbearing upon said drum, and means acting in the operation of the machine for varying the pressure with whichrthe band bears upon the drum. Y

9. In a heeling machine, the combination of a work engaging member, means for moving'saidmember to apply pressure to the work, and frictional power transmitting connections between said means and member including anfriction drum, a b'and'bearing uponssaid drum and means for increasing the pressure of the band-upon the drum during: "the, application of work.

pressure to the V 10. In a heeling machine,the combination ofa worklengaging member, means for mov- 7 rssaevo 1:2. In a heeling machine, the combination of a work engaging member, means for moving said member to apply pressure to the work, pressure transmitting connection between said means and member, including a friction device, and an adjustable cam for variably controlling the operation of the friction device.

13. In a heeling machine, the combination of a work engaging member, means for moving said member to apply pressure to the work, and power transmitting connections between said means and member including a friction device movable in two directions and constructed and arranged to operate with greater iriction when moving in one direction than when moving in the other direction. Y

14-. In pressure mechanism for heeling machines, the combination of a pressure member arranged for cooperation with the work, and operating connections therefor in-- cluding a rotatable, reversible friction drum, and a friction band partially surrounding and bearing upon the drum, one end of the band being anchored at a point which is stationary relatively to the axis of the drum, and the other end of the band being held yieldingly under tension, whereby greater friction is exerted upon the drum during its rotation in one direction than during its rotation in the opposite direction.

15. In pressure mechanism for heeling in achines,the combination of a pressure member arranged for cooperation with the work. and operating connections therefor, including a rotatable, reversible friction drum, a friction band partially surrounding and bearing upon the drum, one end of the band being anchored at a point which is stationary relatively to the axis of the drum, a spring connected to the other end of the band and arranged to draw the band 1nto engagement with the drum and means for varying the tension of the spring.

16. In a heeling machine, the combination of a nailing die, reciprocating nail drivers, means for advancing the drivers and die, and automatic means for variably limiting the return stroke of the die without affecting the stroke of the drivers.

17. In a heeling machine, the combination of a nailing die, reciprocating nail drivers, means for advancing the drivers to a. fixed, predetermined limit and the die through a less distance, said advancing means acting also to withdraw the drivers and die, and means for variably limiting the return stroke of the die.

18. In a heeling machine, the combination of a nailing die, reciprocating nail drivers, means for advancing the drivers to drive nails, a lost motion connection between the drivers and the die, an adjustable stop for variably predetermining the limit of the return stroke of the die, and means for setting the stop'in the operation of the machine.

19. In a heeling machine, the combination of a reciprocable nailing die, a reciprocating driver spindle, a gang of nail drivers mounted upon the spindle, power means for ad vancing the spindle to drive nails, lost motion connections between the spindle and the die arranged to move said die in opposite directions, and an adjustable stop for variably limiting the return stroke of the die.

20. In a heeling machine, the combination of a driver supporting head, a gang of nail drivers carried by the head, power means for advancing the head and drivers to drive nails, an upright sleeve rigidly secured to the head, areciprocable guide rod within the sleeve, :1 nailing die supported by the guide rod, and an adjustable bushing surrounding the guide rod beneath the sleeve, said bushing being in position to be engager by the rod to limit the return stroke thereof.

21. In a heeling machine, he combination of a stationary work engaging member, a movable member for engaging and exerting pressure upon the work, power means having an invariable stroke for actuating the movable member, automatically acting mech anism for varying the limit of the advancing movement of the movable member, and means for rendering said automatically acting mechanism inoperative.

22. In a heeling machine, the combination of relatively movable work engaging and pressing members, power means having an invariable stroke for actuating one of said pressing members, automatically acting mechanism for varying the limit of the advancing movement of said member, and means for rendering said automatically acting mechanism inoperative.

23. In a heeling machine, the combination of a jack, a nailing die, means for advancing the nailing die toward the ack to exert pressure upon the work, controlling mechanism acting automatically to cause the nailing die to be advanced alternately to greater and less distances from the jack in successive cycles of operation oi the machine and means for rendering said controlling mechanism inoperative.

24. In a heeling machine, the combination of a jack, a nailing die, toggle mechanism for moving the nailing die toward the ack to exert pressure on the work, and means acting automatically to transmit alternately greater and less amounts of the movement of said toggle mechanism to the nailing die in successive cycles of operation of the machine.

25. In a heeling machine, the combination of a jack, a nailing die, toggle mechanism for moving the nailing die toward the jack to apply pressure to the work, and automatic means controlled by the movement of the toggle for causing alternately greater and less proportions of the throw of the toggle to be transmitted to the nailing die.

26. In a hecling machine, the combination of a jack, a nailing die, toggle'mechanism for effecting relative approaching movement of the nailing die and the jack to apply pressure to the WOIk and automatic means carried bythe toggle for causing alternately greater and less proportions of the throw of the toggle to be transmitted to the die in successive cycles of operation of the machine.

27. In pressure mechanism for hceling machines, the combination of a nailing die, means for supporting the die, toggle mechanism for advancing the die and die support, and a rocker member mounted in one link of the toggle, said rocker member having steps of different heights alternatively movable into position to transmit the movement of the toggle to the die support.

28. In pressure mechanism for heeling machines, the combination of a nailing die, toggle mechanism for advancing the die to apply pressure to the Work, a member carried by the toggle and having steps of different heights movable alternatively into position to transmit the movement of the toggle to the die, automatic means for offecting said movement of said member, and

means for rendering said automatic means inoperative.

29. In pressure mechanism for heeling machines, a pressure toggle embodying a rocker member having pressure transmitting portions of different heights, cam mechanism for moving said pressure transmitting portions alternatively into operative position and ratchet mechanism operated by relative movement of the toggle links for actuating said cam mechanism.

30. In a heeling machine, the combination of a nailing die, toggle mechanism for advancing the die to apply pressure tothe Work, a lost motion connection between the toggle and the nailing die, and means for eliminating the lost motion in alternate cycles of operation of the machine.

In testimony whereof- I have signed my specification.

name to this JOHN F. STANDISH.

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