US2494494A

US2494494A - Heel attaching machine

Info

Publication number: US2494494A
Application number: US748380A
Authority: US
Inventors: Edward F Small
Original assignee: Compo Shoe Machinery Corp
Current assignee: Compo Shoe Machinery Corp
Priority date: 1947-05-16
Filing date: 1947-05-16
Publication date: 1950-01-10
Anticipated expiration: 1967-01-10

Description

Jdn. 10, 1950 SMALL 2,494,494

HEEL ATTACHING MACHINE Filtd May 16, 1947 3 Sheets-Sheet l IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIQ j/w s/vme. Hy EDNA/8D 5.5mm

BY A TOR/V5) Jan. 10, 1950 Filed y 16, 1947 E. F. SMALL HEEL ATTACHING MACHINE 3 Shets-Sheet 2 EDWARD/Y MALL Jan. 10, 1950 E. F. SMALL HEEL ATTACHING momma 3 Sheets-Shee't'li Filed May 16, 1947 4 h u m WU. a A H w u i m t F 3 m a F M Y D rl MM F v. j p I, B 6 .A 9 (a, n a x E, a M x s 1 m M a l I z Patented Jan. 1950 HEEL ATTACHING MACHINE Edward F. Small, Newton, Mass., assignor to Compo Shoe Machinery Corporation, Boston, Mass., a corporation of Delaware Application May 16, 1947, Serial No. 748,380

7Claims. 1

This invention relates to screw inserting machines and more particularly to a machine for securing heels to shoes.

It is customary to initially secure a heel to a shoe, while the shoe is mounted upon its original last, by drilling a lead hole through the heel seat of the shoe and into the positioned heel and thereafter driving a woodscrew into the hole to draw the parts together.

Attempts have been made to drive a screw into the shoe and heel without first forming a lead hole and I have found that this practice is very satisfactory providing the body diameter of the woodscrew is smaller than that of the screws generally used when a lead hole is formed.

A general object of this invention is to provide an improved machine for securing heels to shoes by means of woodscrews, while the shoes are mounted upon their original lasts, which is simple in construction, rapid and simple to operate, and which reduces the cost of such operation while increasing the output per machine.

Another object of the invention is to provide a screw inserting machine which is largely automatic in operation and which, when used with prepared lasts, will drive the woodscrews to a definite depth without marring the screw heads.

A further object of the invention is to Provide a screw inserting machine having a single screw driving spindle which is rotated in a screw driving direction to cause it to be moved towards the work and in a reverse direction to move it away from the work thus obviating the necessity of expensive stop mechanisms.

A still further object of the invention is to provide a screw inserting machine having a screw driving spindle construction which allows rotation of the spindle to be reversed when the screw has been driven to the desired depth, the screw driver to be moved away from the work and to be held non-rotative until it is withdrawn from its driving connection with the screw driven into the work.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the invention will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description taken in 2 connection with the accompanying drawing, in which:

Fig. 1 is a front elevation, partly in section, of a screw inserting machine embodying features of my invention;

Fig. 2 is a side elevation, partly in section, of

the machine;

Fig. 3 is a partial sectional plan view taken along lines 3-3 of Fig. 2;

Fig. 4 is a fragmentary sectional view showing the last thimble mounted upon the last support and the spindle in position ready to drive a screw;

Fig. 5 is a fragmentary plan view taken along lines 5--5 of Fig. 4;

Fig. 6 is a fragmentary view, partly in section, similar to Fig. 4 but showing the screw driver spindle starting to drive a screw into the shoe and heel;

Fig. '7 is a view similar to Fig. 6 but showing the screw driver spindle after its rotation has been reversed and the screw driver disengaged from driving connection with the screw driven into the shoe and heel;

Fig. 8 is a schematic wiring diagram of the electrical elements of a machine; and,

Fig. 9 is a fragmentary plan view taken substantially along line 9-9 of Fig. 2.

Referring to the drawing, there is shown a machine for attaching heels to shoes the general construction of which is similar in many respects to the machine described in my co-pending application Serial No. 695,431, filed in the United States Patent Office on September '7, 1946, now Patent No. 2,449,333 issued September 14, 1948.

The machine of this invention comprises a base casting Hi to which the top casting II is secured by the bolts H to form a frame to support and house the machine mechanism.

The underside of the top casting l l is provided with a depending boss I3 to which a bracket I4 is secured by the screws l5. An extension of the bracket terminates to form a boss l6 which is bored to receive a bushing I! in which the lower end of the screw-driver spindle I8 is journalled.

The upper end of the screw-driver spindle is journalled in a bushing I! which is pressed into a cap 20 secured by the screws 2| to the underside of the top casting H in alignment with a bore formed therein and the hollow last supporting pin 22 is secured by the screws 23 to the upper side of the top casting in alignment 3 cured thereto is belted to a pulley driven by the shaft of an electric motor 25 which is secured to the base casting.

The screw-driver spindle is also adapted to be reciprocated and this is effected by and is dependent upon rotation of the spindle.

As best shown in Figs. 2 and 3, a worm 21 is keyed to the spindle I8 and is held in place by the collars 28 and 29 against which the inner races of the ball bearings 58 and 8| are jammed by the

lock nuts

22 and 32 threaded to the spindle.

The outer races of'the ball bearings fit within vertical bores formed in a gear housing 24 which is forced to partake of any reciprocating movement of the spindle due to the outer race 01' the ball bearing 80 being locked against the shoulder 35 of the gear housing by the cap 58.

The gear housing 34 is prevented from rotating with the spindle I8 by a key 31 which is formed integral with the housing and which fits and slides in a spline 38 formed in the bracket I4.

The gear housing is also provided with the horizontally extending bores 38 in which is journalled a shaft 40 having a worm wheel gear 4I keyed thereto which meshes with and is rotated by the worm 21. The shaft 40 extends from each end of the gear housing and set screwed to each extension is a crank disc 42 having threaded thereto a crank pin 43. With this construction the cranks revolve as long as the spindle I8 is rotated.

Each side of the bracket I4 is provided with a horizontally extending shelf like portion 44 and secured therein are wear plates 45 which are engaged by the crank pins 43 thus causing the entire gear housing and spindle to be moved when the spindle I8 is rotated.

A cylindrical clutch portion 46 is secured by a taper pin 41 to the upper end of the spindle I8 and is internally threaded with a left hand thread of coarse pitch. As shown in Figs. 4, 5 and 6, the upper surface of the clutch portion is cut away to leave an upstanding segment 48 which engages with a dog pin 49 extending from the screw driver shaft 50 which threads into the clutch section.

The screw-driver bit 5| is threaded into the shaft so that the bit can easily be replaced.

The last L upon which the shoe S is mounted,

and all lasts intended for use with the machine are provided with a screw receiving recess in the form of a metal last thimble T which Is pressed into the last and seats against a washer W having an opening of smaller diameter than the thimble so as to provide a shoulder to engage against the top of the last-supporting pin 22 and to take the heel clamping pressure. Regardless of the size of the last, the washer W is located a definite distance away from the heel seat portion and, as will be later understood, this allows the heel attaching screw F to be driven to a definite depth.

The heel clamping device comprises a heel engaging member 52 which is swingably mounted upon the pivot ends of the screws 53 which are threaded into the U-shaped ends 54 of the arm 55. The other end of the arm 55 is bifurcated to fit over a lever 55 and is pivoted thereto at 51. A screw 58 prevents the arm from moving with respect to the lever while clamping a shoe and also serves to adjust the position of the arm to accommodate different styles of heels.

The lever 55 is pivoted at 59 to the bifurcated end of a plunger 60 which is freely movable in a bore 8| formed in the bracket I4. The plunger 4 has portion 52 of reduced diameter which passes through a hole 88 formed in line with the bore 8| and a compression spring 84 serves to upwardly bias the plunger, the lever 58 and its associated parts.

The nut 85 serves to limit the extent that the plunger can be raised under the influence of the spring 54.

The horizontally disposed end 85 of the lever 58 is bifurcated to straddle the spindle I8 and gear housing 24 and each leg of the lever is pivotally joined to a treadle rod connector 81 by the clevis pins 58. The upper ends of the treadle rods 58 are screw threaded into the connectors 51 and the lower ends are threaded into the clevises 10 which are pivotally connected to a rod H extending from and crosswise to the treadle 12.

The treadle 12 is pivotally mounted upon the shaft 13 held by the bracket 14 secured to the base casting In by the bolts 15.

When the treadle 12 is in its upper position the arm 55 is in a position remote from the last supporting pin 22, as shown by dot dash lines in Fig. 2, and allows the shoe and last to be placed easily upon the pin.

In operation of the machine, the operator drops a woodscrew F, preferably of the recessed head type, head down into the hollow last supporting pin 22 where it comes to a rest upon and centers with the screw driver bit 5|. A shoe with its last is placed upon the last pin, the heel is positioned and the treadle 12 depressed which first causes the lever 55 to move about its pivot until the heel engaging member 52 contacts the heel. Further depression of the treadle overcomes the bias of the spring 54 and the complete heel clamp moves downwardly to clamp the heel H to the shoe S and the last is firmly pressed downwardly until the washer W within the last is pressed against the top of the last supporting pin 22. The heel clamp is prevented from moving rearwardly by the pin 16 which is pressed into the lever 55 and which engages against the block 11 screwed to the top casting as shown in Figs. 2 and 9.

When the heel is clamped, the operator depresses the button 18 of a switch 19 which, as shown in Fig. 8, energizes the coil of a magnetic contactor to start the motor 26 and this causes the spindle I 8 to be rotated in a screw driving direction. As the spindle is rotated it is also moved towards the shoe and heel as the crank pins 45 press against the wear plates on the bracket I4 and cause the complete gear housing 34 to lift.

Since the threaded connection between the screw driver shaft 50 and the clutch section 48 is of opposite hand to the screw to be driven, the shaft 50 does not rotate during a portion of the first revolution of the spindle I8 but is simply elevated until the dog pin 49 is engaged by the segment 48 on the clutch section which acts as a driver.

After engagement of the dog pin with the clutch section segment 48, the spindle I8 and the screw driver shaft and bit continue to rotate and be moved upwardly as a unit and the screw F is driven into the shoe and heel.

When the screw is driven to the correct depth into the shoe and heel. rotation of the spindle I8 is reversed. This is accomplished by a double pole double throw switch 8| which is held upon a bracket 82 bolted to the base casting I0 and which is actuated by the collars 83 which are adjustably secured to a rod 84 threaded and locked to a plate 85 extending-from the cap 36 on the gear housing 34.

When the rotation of the spindle I8 is reversed, the screw driver shaft 50 does not rotate as it simply threads into the clutch section 46 until the crank pins 43 have rotated suflicient to allow the gear housing and spindle to lower an amount sufficient to allow the screw driver bit to disengage from its driving connection with the screw head as indicated by Fig. 7. After the screw driver bit has cleared the screw head, it again rotates with the spindle I8.

As the gear housing reaches its lowest position the reversing switch 8| is again actuated and as the operator hears its action he allows the button 18 of the switch 19 to be released and the motor is deenergized.

The foot treadle is released and the shoe with its attached heel is removed and the machine remains ready to operate upon another shoe.

Since certain changes may be made in the above construction and different embodiments .of the invention could be made without departing'from the scope thereof, e. g., a pawl and ratchet or other one way clutch device could be substituted for the threaded connection between the screw driver spindle l8 and the screw driver shaft 50, it is intended that all matter contained in the above description 0r shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a screw inserting machine, a work support, a rotatable spindle, a screw driver mounted upon said spindle, means for rotating said spindle and screw driver in a screw driving direction and for moving such assembly towards said work support, means for reversing the direction of rotation of said spindle and for allowing it to move away from said work support, and means for preventing reverse rotation of the screw driver mounted upon said spindle until said spindle has moved away from said work support a distance suflicient to disengage said screw driver from driving engagement with a screw.

2. In a screw inserting machine, a work support, a rotatable spindle, a screw driver mounted upon said spindle and rotatable therewith through a lost motion connection, means for rotating said spindle and screw driver in a screw driving direction and for moving such assembly towards said work support, and means for reversing rotation and movement of said spindle when it has moved towards said work support a distance sufficient to drivea screw into work held thereto, whereby said lost motion connection between said spindle and said screw driver will allow said screw driver to be held nonrotative during reverse rotation of said spindle until said spindle has moved away from said work support a distance sufficient to withdraw said screw driver from driving engagement with the screw driven into the work.

3. In a screw inserting machine, a work support, a rotatable spindle. a screw driver mounted upon said spindle and rotatable therewith through a one-way clutch, means for rotating said spindle and screw driver in a screw driving direction and for moving such assembly towards said work support, and means for reversing rotation and movement of said spindle when it has moved towards said work support a distance suflicient to drive a screw into work held thereto, whereby said one-way clutch will allow said screw driver to be held non-rotative durin reverse rotation of said spindle until said spindle has moved away from said work support a distance sufficient to withdraw said screw driver from driving engagement with the screw driven into the work.

4. In a screw inserting machine, a work support, a. rotatable spindle, a screw driver, said screw driver being rotatably threaded to one end of said spindle with a thread having a helix rotation opposite to that of the screws to be driven, means for limiting rotation of said screw driver with respect to said spindle, means for rotating said spindle and-said screw driver in a screw driving direction and for moving such assembly towards said work support, and means for reversing rotation and movement of I said spindle when it has moved towards said work support a distance sufficient to drive a screw into work held thereto, whereby said screw driver will be held non-rotative during reverse rotation of said spindle until it is moved away from said work support a distance suflicient to withdraw it from driving engagement with the screw driven into the work.

5. In a heel attaching machine, the combination comprising, a frame, a hollow last pin mounted upon said frame, means for clamping a heel to a shoe on a last supported by said last pin, a screw driving spindle in alignment with said last pin, power operated means for rotating said spindle in a screw driving direction, means dependent upon rotation of said spindle in a screw driving direction for moving it towards and to drive a screw into the shoe and heel supported by said last pin, and automatically operated means for reversing the direction of rotation of said spindle and for moving it away from the shoe and heel supported by said last pin.

6. In a heel attaching machine, the combination comprising, a frame, a hollow last pin mounted upon said frame, means for clamping a heel to a shoe on a last supported by said last pin, a rotatable spindle in alignment with said last pin, a screw driver held to said spindle, means for rotating said spindle and said screw driver in a screw driving direction and for moving said spindle towards the shoe and heel supported by said last pin to drive a screw therein, means for reversing the direction of rotation of said spindle and for moving it away from the shoe and heel, and means for preventing reverse rotation of said screw driver until said spindle has moved away from the shoe and heel a distance sufficient to withdraw said screw driver from driving engagement with the screw driven therein.

'7. In a heel attaching machine, the combination comprising, a frame, a hollow last pin mounted upon said frame, means for clamping a heel to a shoe on a last supported by said last pin, a housing slidable on said frame, a screw driver spindle journalled in said housing, one end of said spindle extending into said hollow last pin, a screw driver rotatably secured to the end of said spindle extending into said hollow last pin. means for limiting rotation of said screw driver with re spect to said spindle, a shaft journalled in said housing and extending at a right angle to said spindle, gearing connecting said shaft and said 8 spindle, means for rotating said spindletin a screw REFERENCES CITED driving direction, a crank mounted on he end of said shaft, means engaging said crank to cause fig' figmigg are of record m the said housing and spindle to move towards the heel clamped to the shoe supported by said hollow last UNITED STATES PATENTS pin as said spindle is rotated, means for reversing V the direction of rotation and movement of said agi: gi 1945 spindle, when it has moved towards the heel a distance s uflicient to drive a screw therein, and FOREIGN PATENTS means for preventing reverse rotation of said 10 Number Country Date screw driver while it is in engagement with a 3 5 7 Great Britain "0118 screw driven into the shoe and heel.

EDWARD F. SMALL.