US1054042A - Machine for turning bobbins. - Google Patents

Description

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N. H. SHAWI MACHINE FOR TURNING BOBBINS.

APPLICATION FILED MAR. 1, 1909,

LQQgQLQM Patented Feb. 25, 1913.

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MACHINE FOR TURNING BOBBINS.

APPLIGATION FILED MAR. 1, 1909.

Patented Feb. 25, 1913.

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UNITED STATES PATENT OFFICE.

NATHANIEL H. SHAW, F BOSTON, MASSACHUSETTS.

MACHINE FOR 'TURNING BOBBINS.

To all 'whom t may concern.'

Be it known that. I, NATHANIEL H. SHAW, av citizen of the United States, residing at Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Machines for Turning Bobbins, of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawing representing like parts.

This invention relates to a machine for shaping' roughly bobbinsfrom wood stock and is in the nature of an improvement on the machine shown and described in my Patent No. 740,191, September 29, 1903.

The machine shown in this application is similar to that shown in Iny above-mentioned patent in that it comprises a swinging knife, means to hold and rotate stock, means to swing the knife into position to act on the stock and shape a bobbin therefrom, and means to feed the stock from which the bobbins are made to the centers where each is automatically gripped in turn and acted on by the knife.

Referring to the drawings wherein I have shown an embodiment of my invention, Figure 1 is a front. view thereof; Fig. 2 is a top plan View; Fig. 3 is a detail of a portion of the knife; Fig. 4 is a section on the line Fig. 1; Fig. 5 is a detail view of the cam for operating the stock-feeding device;

Fig. 6 is a detail of the mechanism for operating the movable center; Fig. T shows the fixed center.

The operative parts of the machine are supported on a frame 3 which may be of any suitable or usual construction. The blank 4 of wood stock to be turned into a bobbin is sustained by two centers and 6. The center 5 is mounted in a head 7 which is provided with teeth 3 that are adapted to engage the end of the blank 4, as shown in dotted lines Fig. 7, thereby to rotate the blank. The center 5 is yieldingly sustained in the head 7 said center being mounted to slide in said head and being acted on by a spring 9 that tends to project it into the full line position Fig. 7. The head 7 is positively driven by means of a driving pulley 10 which is suitably sustained in bearings in the head stock of the lathe. The other or dead center comprises a brad center 6 and a Specification of Letters Patent.

Application filed March 1, 1909. Serial No. 480,713.

Patented Feb. 25, 1913.

that extendsthrough .a sleeve 12 that is slidably mounted in bearings 13 and 14 on the tail stock. The main center which supports the stock While it is being turned acts also as a driver to force the stock onto the teeth 8 of the chuck 7, as will be presently described.

The end of the rod 11 projects beyond the sleeve 12, as at 16, and connected to said projecting end 1G is an arm 17 -to which is connected a rod 1S extending parallel to the rod 11 and slidable through openings formed in the uprights of the tail stock. Said rod 18 has thereon a projection 19 that is adapted to be engaged by a spiral cam 20 fast on a short shaft 21, one end of which is centered in thc upright 13 and the other end of which is sustained by a pointed screw 23 carried by the upright 14. A. tension spring 25 surrounding the rod 18 tends to keep the rod and consequently the brad center G in its position toward the left Figs. 1 and 2. As the vspiral cam 20 rotates it engages the projection 19 and withdraws the center 6 as will be obvious. The tube or sleeve 12 has fast thereto a stud carrying a roll 26 which plays between two guide members 27 and also has fast thereto another stud carrying a roll 28 that is situated to be acted on by the spiral cam 20. Situated within the tube 12 is a spring 29 one end of which engages an interior shoulder 30 formed in the tube and the other end of which engages a head 31 situated within said tube. Said head 31 is carried by a screw-threaded stem 32 which is screw-threaded through the end 33 of a cylinder 34 that is rigidly secured to the bearing 14. rThis may conveniently be done by screw-threading the cylinder 34 onto the hub of the sleeve or bushing which is rigidly carried by the bearing. The end of the tube 12 is provided with a piston head36 that tits the interior of t-he cylinder 34,- and said cylinder 34 has a vent opening 37. The spring 29 tends normally to force t-he tube 12 and the center 15 to the left Fig. 6, and into engagement with t-he stock 4, and the dashpot construction comprising the cylinder 34 and piston 36 serves as a. cushion device to cushion the action of the spring in oase a.

blank 4 should not be located between the centers as will be more fully hereinafter described.

The pieces of stock 4 are fed into position between the centers automatically by means of a stock-carrier 40 which has a construction similar to that shown in my beforementioned patent. This carrier is trough shaped to receive the pieces of stock 4, as shown best in Fig. 4, and it is mounted on a support 41 which is pivoted at 43 to .a bracket 42 sustained by the frame. 4This carrier 40 is moved toward and from the centers as in my above-mentioned patent and at the time that it is moved into position in alinement with the centers the spiral cam 2O acts to withdraw the dead center 6 to permit the block in the carrier to be positioned between the centers, and as soon as the block is thus positioned, the cam passes off from the projections 19, 28. U

The projections 19 and 28 are so positioned that the projection 19 first passes olf from the spiral cam 2O thereby permitting the center 6 to be projected into the end of the stock and thereafter the project-ion 28 passes off from the spiral cam. As soon as this occurs, the spring 29, which has been compressed by the backward movement of the sleeve 12, operates to throw the said sleeve forwardly with a quick hammer-like blow, thus bringing the center 15 into engagement with the stock 4 and driving the stock toward the left into the dotted line position Fig. 7 whereby the teeth 8 are embedded in the end of the stock, the live center 5 being carried backwardly into the dotted line position during this movement. The stock is then firmly held between the centers and is ready to be operated on b v the knife. In case a piece of stock should fail to be presented to the centers the spring 29 will throw the sleeve 12 forward until the piston head 36 passes by the vent opening 37 after which the air still confined in the cylinder 34 will cushion the movement of the tube 12.

For moving the carrier 40 I have provided a mechanism which is adapted to yield in case a piece of stock should get misplaced or get caught in the way, and in this respect my invention differs from my above-mentioned patent. The mechanism I have provided for this consists of a rod connected to the upper end of the support 41 and having a head 51 that plays in a tubular member 52. A spring 53 is confined in the tubular member between the head and one end. The tubular member is secured to a bracket 54 which has a slot 55 therein through which extends a cam shaft 56 that acts as a guide for the bracket. A disk 57 is mounted fast on the cam shaft and is provided with a pin or projection 58 that is adapted to engage a vertically-extending projection 59 situated on the side of the bracket 54. As the disk rotates in the direction of the arrow Fig. 4, the projection 58 engages the vertical arm 59 and serves to force said arm and the bracket 54 backwardly thus swinging the carrier int-o position in alinement with the centers. The arm 59 has such a length that the pin 58 will pass 01T from the bottom thereof at the time that the carrier is properly alined with the cent-ers, and as soon as this occurs a spring 60 comes into play to return the carrier to its initial position. If the carrier 'should meet any obstruction on its movement toward the center the spring 53 will yield thus preventing any breakage of any of the parts. I have also provided for adjusting the length of the connection for operating the swinging arm 41. As herein shown the rod 50 is screw-threaded at one end, as at 111, and its other end has screw-threaded engagement wit-h the upper end of the arm 41, so that by applying a wrench to the squared end of the rod 50, the length of the connection can be adjusted.

110 is a stop nut which limits the expansive movement of the spring 53.

The knife for shaping the bobbins is shown at 61. It is carried by a swinging support 62 as in my former patent and is actuated by mechanism similar to that shown in the patent. The support 62 is shown as pivoted to the frame at 63 and has pivotally connected thereto a head 64 from which extend two parallel rods 65'that play through a box 66 loose on the cam shaft 56. A block 67 is also loosely mounted on these rods and is provided with a projection 670 that is adapted to be acted on by a cam 68 mounted on the cam shaft 56. Springs 70 are placed around the rods between the block 67 and the head 64, and other springs 69 surround said rods and are situated between the box 66 and a cross piece 71 carried by the rods. As the cam rotates it forces the block 67 toward the left Fig. 4 thereby acting through the springs 70 to swing the knife-carrier into its operative position. lVhen the cam passes out from under the roll 670, the springs 69, and 70 restore the parts to their normal osition. The forward movement of the knifecarrier is limited by adjustable stops 7 3 that are carried' by suit-able arms 74. The cam shaft 56 may be driven in any suitable way and I have herein shown it as provided at one end with a gear 8O forming part of a set of adjustable or change gears 81 which operate similar to the corresponding gears of an ordinary lathe. These gears 81 are driven from a step pulley 82 which in turn is belted to a step pulley83 that receives its motion from the driving pulley 10. The advantage of using change gearing is that the speed of rotation of the cam shaft may be varied to suit the circumstances under which the work is done. The spiral cam 20 may also be driven in any suitable way, but I have herein shown it as driven from the cam shaft 56. For this purpose said cam shaft has a gear 84 thereon which meshes with an intermediate gear that in turn meshes with and drives a gear 86 rigid with the spiral cam.

90 is a positioning stop for positioning the stock in the 'carrier 40. This stop is adapted to engage the end ofthe stock but is moved out of the way when the stock is brought int-o alinement with the centers. Said stop is shown as an arm formed on a rock-shaft 91 which is journaled in the bracket 92 and which has an arm 93 that is-adapted to engage the head 7 as the carrier swings forwardly. The engagement of the arm 93 with the head 7 turns the rock-shaft to remove the stop 90 from engagement with the end of the-stock thereby permitting the stop to have its longitudinal movement necessary to be gripped between the centers. A spring 94 tends to maintain the stop in normal position.

The knife I have herein shown is made removable so that any one of a plurality of diiierent shaped knives may be used. The knife is made with the offset 'portion 95 which engages an adjusting screw 96 carried by the knife frame. Said screw constitutes a backing for the offset portion of the knife and prevents said portion of the knife from springing away from the beveled shoulder 120.

I have herein shown a novel way of adjustably mounting the carrier so as to permit it to be adjusted both vertically and' horizontally, and also so as to permit one end to be raised more or less. As herein shown the swinging support 41 has adjustably secured to its upper end an arm 101 to which a plate 102 is bolted by meansof bolts or screws 103. The arms 101 can be adjusted vertically on the swinging support and is held in adjusted position by the clamping screw 104. The plate 102 can be adjusted longitudinally on the arm and is held in adjusted position by the bolts 103. T he carrier 40 comprises thc two wings 10T, 112 between which the stock 1 is sustained, and the wing 112 is pivoted on a rod 108 sustained by the wing 107, a spring 109 serving normally to hold the wing 112 in proper position. The object of pivoting this wing 112 is to permit it to swing downwardly so as to clear the stock when the carrier is returned to normal position, all as shown and described in my former patent. @ne end of the wing 107 is pivoted to the plate 102 at 100, and the other end of said wing is clamped to the plate by a bolt 105 which passes through a slot formed in the plate. The right hand end of the carrier can thus he elevated or depressed as desired. This adjustment of the carrier adapts lthe machine to receive stock of different lengths and sizes.

22 designates a rock shaft extending longitudinally of the bed of the frame and having a handle 100 at one end and an arm 2-1 at the other carrying a binder pulley 99 which acts to tighten the belt connecting the pulleys 82, 83.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a machine ,of the class described, the combination with a spring-actuated and longitudinally-movable brad center and a slidably-mounted spring-actuated tube in which saidcenter is sustained, said tube having a main center to'engage the same end of the stock as that engaged by the brad center, of a` single cam to act on and withdraw both said centers against the action of their springs, said cam releasing said centers successively. a

In a. machine of the class described, the combinationwith a spring-actuated and longitudinally-movable brad center, a slidablymounted spring-actuatedI member having a main center to strike and sustain the same end of the stock as that engaged by the brad center, and means to feed pieces of stock separately to the centers, of a spiral cam to withdraw both said brad center and said `spring-actuated member when each piece of stock is fed thereto said cam operating to release the brad center first and then the main center.

3. In a machine of the class described, the combination with a spring-actuated and longitudinally-movable brad center, a slidablymounted spring-actuated member having a main center to strike and sustain the end of the stock, means to feed pieces of stock separately to the centers, and a knife to act on the stock, of a single cam to withdraw both centers after the bobbin is finished said cam operating to release said centers successively.

4. In a machine of the class described, the combination with a spring-actuated and longitudinally-movable brad center and a slidably-mounted spring-actuated tube in which said center is sustained, said tube having a main center to engage and sustain the end of the stock, of a single cam to act on and withdraw each center, and a cushion device to limit the spring-impelled movement of said main center when a piece of stock is not fed to the machine.

5. In a machine of the class described, the combination with a spring-actuated and longitudinally-movable brad center, a slidablymounted spring-actuated member having a main center to strike and sustain the end of the stock, and means to feed pieces of stock separately to the centers, of a spiral cam to withdraw both said brad center and said spring-actuated member when each piece of stock is fed thereto, and a cushion device to limit the spring-impelled movement of said main center when a piece of stock is not fed to the machine.

6. In a machine of the class described, the combination with a spring-actuated and longitudinally-movable brad center, of a slidably-mounted spring-actuated tube in which said center is sustained, said tube having a main center to engage and sustain stock and a piston head, a cylinder in whlch said plston head works, and means to retract both the brad center and said tube to permit stock to be placed between the centers, said cylinder acting to cushion the spring-impelled movement of the tube.

7. In a machine of the class described, the combination with a slidably-mounted brad center, a spring-actuated rod parallel with said center and connected thereto, and a projection on said rod,-of a slidably-mounted tube in which said brad center is received, a main center sustained by said tube, a projection on the tube, and a spiral cam to engage both projections whereby both .centers are retracted.

8. In a machine of the class described, the combination with two centers, of a stock carrier to deliver separate pieces of stock to the centers, and an actuator including an adjustable yielding connection for moving the stoclocarrier toward the centers.

9. In a device of the class described, the combination with two centers and a swinging stock-carrier movable toward and from the centers, of a movable positioning stop sustained by said carrier, and means to engage said stop during the movement of the carrier toward the centers thereby to swing said stop into inoperative position.

10. In a machine of the class described, the combination with two opposed centers, one of which is a spring-actuated longitudinally-movable brad center, of a slidablymounted spring-actuated tube in which said center is sustamed, said tube having at its end a main center to engage the end of the stock, a stock-carrier' to deliver pieces of stock to the oppositely-disposed centers, an actuator including an adjustable connection for moving the stock-carrier toward the centers, and a single spiral cam to withdraw both said brad center and said main center when each piece of stock is fed thereto.

. 11. In a machine of the class described,y

the combination With two opposed centers, one of which is a spring-actuated longitudinally-movable brad center", of a slidablymounted spring-actuated tube in which said center is sustalned, said tube having at its end a main center to engage the end of the stock, a stock-carrier to deliver pieces of stock to the oppositely-disposed centers, an actuator including an adjustable connection for moving the stock-carrier toward the centers, a single spiral cam to Withdraw both said brad center and said main center when each piece of stock is fed thereto, and a cushion device to limit the spring-impelled movement of the main center at such times as a piece of stock fails to be delivered to the machine.

In testimony whereof, I have signed my name to this specification, in the presencel of two subscribing Wltnesses.

NATHANIEL II. SHAW.

Witnesses LOUIS C. SMITH, FREDERICK S. GREENLEAF.

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