US1269493A - Gear-cutting machine. - Google Patents

Description

O. NEWLANDER. GEAR CUTTING MACHINE.

APPLICATlON FILED APR. 22, l9l6.

Patented June 11, 1918.

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GEAR cunmc MACHINE.

APPLICATION FILED APR. 22. 1916.

1,269,493. Patented June 11, 1918.

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GEAR CUTTING MACHINE.

APPLICATION FILED AHLZZ. 1916.-

Patented J 11110 11, 1918.

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GEAR-CUTTING MACHINE.

'forms and irregular sizes of bevel gear teeth and for performing work that is impossible to do upon the commercial styles of gear cutting machines.

It is the object of theinvention to design and construct an attachment of the above 3 class that can be used upon an ordinary milling machine or the like, and in a way to use the regular index head, bed and driving mechanism of such a machine thus materially eliminating the cost of unnecessary parts, floor space, &c., further to provide a machine that is well adapted for cutting special gears or segments of gears, and wherein each tooth, if desired, may be of a difierent width and shape, or a perfect standard tooth.

With these and other objects in view the invention resides and consists in the construction and novel combination and arrangement of parts hereinafter more fully described, illustrated in the accompanyingdrawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departure from the spirit or sacrificing any of the advantages of the invention.

Similar characters of reference denote like or corresponding parts throughout the several figures of the accompanying drawings forming a part of this specification,

v and upon which:

Figure 1 shows a plan view of my special form of gear cutting machine mounted upon the bed of a milling machine and connected to be operated from its spindle.

Fig. 2 shows a partially cut gear blank having teeth of different sizes, such asmy improved type of machine is designed to cut.

Fig. 3 is a side elevation of the same ma- Speciication' of Letters Patent.

chine as seen from the front side of Fig. 1, the indexing mechanism for carrying the gear blank being omitted,and a pedestal with former plates being adjusted to a different position.

Fig. 4 is a reverse side elevation of the mechanism shown in Fig. 3.

Fig. 5 is a further side elevation of the mechanism shown in Fig. 3 showing position of slide at top of tooth.

Fig. 6 is a cross sectional elevation taken on line 6 of Fig. 1 and Fig. 7 .hows a diagram view of a couple of gear teeth and illustrating by dotted llnes therebetween the respective cuts performed by my gear cutting machine as will later be more fully explained.

Patented'June 11, 1918.

Application filed April 22, 1916. Serial No. 92,828. i

For convenience in illustration I have shown my improved machine attached to the bed of a milling machine and connected to be operated by the spindle through a link connection as is clearly shown.

-Referring in detail to the characters of reference marked upon the drawings 8 indicates the table of a milling machine and 9 its spindle'upon the-forward end of which is mounted a slotted crank disk 10. This spindle and disk serve as the operating medium for my improved form of gear cutter, while the table before mentioned serves to support il ekmachine in relation to the spindle and 11 represents the fixed bed of my gear cutter which bed in practice would be suitably secured to the milling machine table before mentioned. A stud 12 is formed on this bed to support an adjustable screw stop 14: to limit the movement of a carrier 18 and to'get the correct depth of the tooth. A second stud 13 serves .as a bearing for an adjusting or feed screw 15 that moves the said carrier 18 including the gear and indexing device.

The said screw '15 is provided with an operating handle 16 and the forward end of the screw threadably engages an eye 17 upon the adjustable carrier 18. This carrier is pivoted to the bed at 19 and can obviously be adjusted to and from the screw stop 14; by the operation of the screw 15.

The carrier referred to is preferably formed in two parts forming two legs that are made adjustable with respect to each other for diiferent angle gears the adjoining ends being spliced together around the pivotal screw 19 and secured one to the other by means of a clamping screw that is seated in the under plate and passes through a. slot 21 in the top plate and is provided with a nut 20. The dotted circular line as scribed from the center of the screw 19 represents the inner edge. portion of the under and smaller plate of the carrier. The larger end portion of this carrier serves to support the indexing mechanism 22, while the other and smaller end portion shown at the right in Fig. 1 serves to carry the adjustable pedestal or turret 23 upon which the former lates 32, 33 and 34 are mounted. This carrler 18 is mounted upon the top face of the bed 11 and its circular edge portion 24 is slidably mounted beneath the guide plate 25 which is secured to the before mentioned bed.

The indexing mechanism indicated by 22 Y may be of any preferred design and includes an o erating handle 26 which when manipulate serves to rotate the gear blank 27 mounted upon the inner end of the arbor 28. A dial plate 29 having a series of notches that are engaged'by a spring actuated pin 30 serves to hold the arbor and gear in any desired or set position. This indexing device is secured to the carrier and is moved therewith to and from the cutter 31. The pedestal 23 mounted upon the short arm portion of the base plate 18 serves to carry the former plates 32, 33 and 34 which determine the line of reciprocation of the cutter slide. This pedestal is rotatably mounted upon a screw stud 35 that is seated in the short arm 18 of the carrier and the pedestal is secured in either of its four positions upon the base plate by means of a screw 36 which clearly appears in Fig. 6. This pedestal together with its former plates is moved in and out or to and from the slide by the operation of the before mentioned adjusting screw 15 and which has before been referred to for moving the indexing device 22. The top edge portion of the'former plates serve to support a roll 37 mounted upon an ad justable plate 38 which serves to position the guideway for the reciprocating cutter slide as will again be referred to.

39 and 40 represent standards that are cast to the base 11 and which serve to support and guide the slideway 41 for the cutter slide. This slideway is pivotally connected to the standard 39 by means of a screw bolt 42. The other and circularly formed end portion of the slideway is mounted in a guideway 43 to allow said end of the slideway to be raised or lowered to change the line of travel of the reciprocating slide 53 carried within said slideway. A suitable yoke 45 is secured to both the top and bottom edge portion of the slideway by means of screws 46 and further includes ways 47 in which the before mentioned vertical slide 38 operates. A. post 48 extends up from the yoke 45 secured to the slideway and upon this post is mounted a rotatable dial 49 which carries a series of adjustable screw stops 50 either one of which may be brought to register, by the turning of the dial, with the to edge portion of the adjustable plate 38. his engagement serves to form a positive and fixed operative connection between the plate 38 and the slideway 41 before mentioned so that as the plate raises and lowers the slide will be raised and. lowered also. If, for instance, it is required for the cutting of certain kinds of teeth, that the cutter should reciprocate in a way which would require the slide to be lowered, then a shorter screw could be brought to engage the top edge of the plate 38, whereas if the slide were tobe set higher a long screw could be brought to register and further adjusted, if necessary, to get exactly the angular line of reciprocation of the cutter slide required. The form or shape of the top'edge of the former plate 32,33 and 34 obviously gives to the cutter the particular line of movement required to produce a certain form of gear tooth, as for instance, it will be noted that there are three former plates employed yet there is room for another, if desire cated by 32 and upon which the roll is shown to rest in Fig. 6 positions the slide so as to insure a direct forward and backward movement of the cutter. This line of movement will, withthe assistance of the hand operation of the feed screw 15, 'produce'the first or straight rough-cut of uniform width in the gear blank indicated by a in Fig. 7. After this cut is produced the pedestal 23 would be shifted so as to bring the next and curved edge former 33 into position and whereby the reciprocating slide would then be operated at a sli ht angle together with the feed screw to orm the cuts indicated by b, to finish the underside of the tooth. A further adjustment of the pedestal would then be made to bring) the third former plate 34 into position and y proceeding the same way the other side of the tooth will be finished to form an oval-operative face. In

this connection, it should be noted that the adjustment of the feed screw 15 serves to move both the gear blank to and from the cutter 31 and the pedestal to and from the slide thereby moving the top edge of the former plate under the roll 37 of the plate 38. The particular shape of the finished tooth would obviously be determined by the sha e of the top edge of the former plate.

e back of the slideway is provided with a slot as indicated at 51 through which a pin 52 loosely passes, and one end of which is seated in the reciprocating slide 53 and to the other end of which the connectingrod 54 is pivoted. The outer end of this connecting rod is ivotally joined to the before mentioned di 10 whereby reciprocating movementis imparted to the said slide 53.

The former plate indi- A weight 55 is mounted upon a lever 56 pivoted to a post 57' upon the standard 39. A link 58 serves to connect this lever with the slideway so as to support the load of the weight on the slideway and parts carried thereby to better hold the roll 37 down against the former plate, so that a horizontal movement of said former plate will cause the said slideway to be raised and lowered.

The cutter 31 is supported in a holder 60 that is pivoted at 61 to the forward end of the horizontally reciprocating slide 53 and yieldably held in an operating position by a spring 60 and is arranged to perform its cutting operation when moving forward as indicated by arrow in Fig. 1 and tilts sufficiently on its return movement to insure the cutter passing freely over the gear blank.

The operator obviously would have to adjust the screw-15 from time to time in order to gradually bring the gear blank nearer to the cutter and in this connection it will also be seen that as the large end of the base plate is drawn in the smaller end 18 carrying the pedestal and formers is moved out, thus bringing a different surface of the particular cam faced former plate under the slide roll and in a manner to move the same. The greater the .pitch in the top edge of the 'former plate, the more the swing of the slideway when the carrier is moved upon its pivot 19 as above stated. Different shapes of gear teeth can be produced by changing t e formers, and if necessar a fourth former plate of greater itch lines can be attached to the side 62 of t e pedestal .now shown empty. This fourth former would be used when an extra. amount of stock is to be removed and the tooth is to have a greater pitch or oval.

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

1. A machine of the class described, including a bed, a two part carrier pivotally mounted thereon and adjustably hinged toether around its pivot to the bed, means or swinging the carrier upon its pivot, a

.former plate.

gear blank supporting and indexing device mounted upon one part of the carrier, a

reciprocating cutter slide and cutter to operthe line of movement of the cutter slide,

means for holding down the slideway and parts carried thereby, an adjustable plate mounted upon the slideway, a dial upon the slideway, and a series of adjustable screws carried by the dial to engage the adjustable plate which rests upon former lates.

- 3. A machine of the class escribed, in-

cluding a bed, a carrier pivotedly mounted thereon, a, standard, a slideway pivoted thereon, a cutter slide mounted in the slideway, means for reciprocating the slide, means for moving the carrier upon its pivot, a gear blank supporting and indexin device mounted upon the carrier, an a justablepedestal mounted upon the carrier, a

series of former plates upon the pedestal to determine the line of movement of the cutter slide, a weight for holding down the slideway and parts carried thereby, an adjustable plate upon the slideway, a dial upon the slideway, and a series of adjusta le screws carried by the dial to engage the adjustable plate which rests upon the Si ed at Bridgeport, in the county of Fair eld and State of Connecticut, this 17th day. of April, A. D. 1916.

OLAF NEWLANDER.

Witnesses:

C. M. NEWMAN RUTH M. W. Koonn.

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