US2264786A - Drill head - Google Patents

Description

Dec. 2, 1941. L. D. BARLEY ETAL 2,264,786

DRILL'HEAD Filed Dec. 2l, 1939 3 Sheets-Shea?I l P 'o 49254-7 46 I fe 4 I 1- .mi 4 l I 0| 20 4 ATTORNEYS Dec. 2, 1941. L. D. BARLEY ETAL DRILL HEAD Filed Dec. 21, 1959 5 Sheets-Sheet 2 nvvENToRs 0 0. me/.fr

Dec. 2, 1941. l., D. BARLEY ErAL 2,264,786

DRILL HEAD Filed Deo. 21, 1939 3 Sheets-Sheet 3 ATTORN 5 Patented Dec. 2, 1941 nam. HEAD Leo D. Barley and Edwlnw. Bradmiller, Dayton,

Ohio, assignors to Harris-Seybold-Potter Company, Cleveland, Ohio, a corporation of Dela- Ware Application December 21, 1939, serial No. 310,280

13 Claims.

This invention relates to a drill head, more specifically toa drill head for a single or multiple head paper drilling or perforating machine. For a full disclosure of a machine of this general type reference may be had to Lewis and Seybold Patent 2,044,709, dated June 16, 1936.

One of the objects of the invention is the provision of nov-el means for chucking the boring tool in its spindle, and especially means which may be conveniently'and quickly manipulated without the machine is running, for adjusting the spindle axially, and with double thrust bearings to take the load when the tool enters the work and also when it is withdrawn from the work.

A further object is the provision of an auxiliary presser foot which may be removably attached to the' head whenever additional pressure on the pile is desired, as for instance when soft stock is being perforated.

Other objects and features of novelty will appear as we proceed with the description of those embodiments of the invention which, for the purposes ofthe present application, we have illustrated in the accompanying drawings, in which- Fig. 1 is a vertical sectional view of a drill headwith that portion of a perforating machine on which the head is directly supported.

Fig. 2 is an edge view of the drill head partly in vertical section on the line 2 2 of Fig. 1.

Fig. 3 is a top plan view of the head.

Figs. 4, 5, 6 and 7 are horizontal sectional views taken substantially on the lines 4-4, 5-5, 6-6 and 1-1 of Fig. 1.

Fig. 8 is a larger scale detail sectional view taken substantially on the line 8-8 of Fig. 1.

- Fig. 9 is a view similar to Fig. 1 showing a modied form of spindle adjustment.

Fig. 10 is an edge elevational view of the same, partly in vertical section on the line Ill- Ill of Fig. 9.

Fig. 11 is a transverse sectional view taken substantially on the line I I--II of Fig. 10.

Fig. 12 is a detail view partly in vertical section of a fragment of a drill spindle with a boring tool in place therein.

Fig. 13 is a cross sectional view taken substantially on the line I3-I3 of Fig. 12.

Referring to Fig. l, I0 represents ,a horizontal transverse beam or bar of a multiple head paper perforating machine, this beam constituting means for supporting one or more drill heads in selected positions crosswise of the machine. Each drill head comprises a housing II which is adjustable along a dovetail way I2 on the beam I0. A screw clamp I3 serves to bind the head I I rmly to the beam- IIl, and when loosened to permit sliding the head transversely of the machine.

A shaft I4 arranged parallel to the beam I 0 is journalled at its ends in the machine frame and is driven by an electric motor or other suitable prime mover, not shown. The shaft is provided with a keyway4 I5 to receive a key I6 projecting inwardly fromy the hub of a spiral gear I1 surrounding the shaft and mounted between the side walls o f the housing II, The shaft therefore drives the spiral gear in any of the positions of adjustment of the head.

The spindle I6 comprises a solid upper portion mounted in anti-friction bearings I9 and 20 and a hollow cylindrical portion 2I mounted in a needle bearing 22. Surrounding the solid portion of the spindle between the bearings I9 and 20 is a spiral gear 23 meshing with spiral gear I1. The spindle is provided with a keyway 24 which receives the driving key 25 carried by the gear 23 and projecting into keyway 24, so that the spindle may be adjusted vertically without interlering with its driving connection with the gear.

26 is a collar formed integral with the spindle and 2l is another collar pinned to the spindle. Thrust bearings 28 and 29 surround the spindle adjacent the collars 26 and 2l respectively and are spaced apart and held in position against the collars by a slide 30 which is adapted to move within a cylindrical pocket 3I in the housing. Obviously when the slide 30 is caused to move up or down in this pocket the bearings 28 and 29 and the collars 26 and 2l must move also, and hence the spindle moves accordingly. 'Ihe slide does not rotate with the spindle. It is slotted on one side to receive a nut 32 that is threaded upon the threaded lower extremity of a vertical shaft 33 having smooth bearing portions 34 and 35 journalled in a vertical bore in the housing-L ,Y Above the bearing portion 35 there is an extenin the other .direction by engagement of the shoulder above portion Il with the plate I1. A knurled knob u may be secured to the extension Il by a set screw 4l so as to provide an easy means of turning the shaft Il. and in order to indicate the extent of movement of the slide 32 and hence of the spindle we provide a spring detent 4l which is adapted to take into any one of a plurality of indentations 42 in the upper surface of plate 31. Preferably we use pitch threads on shaft 33 and in nut 32 and employ five indentations 42 evenly spaced around the hole in plate I1, whereby each turn of the knob 39 from one notch to the next gives a spindle adjustment of ten thousandths of an inch.

In Figs. 9, 10 and 11 of the drawings we have illustrated a modification of the spindle adjusting means which we may employ in cases where it is necessary or desirable to have the presser foot plunger set close to the spindle. In this case instead of a long shaft 33 in front of the spindle we employ a short shaft 43 rearwardly of the spindle mounted in a vertical bore in the housing and provided with an enlarged threaded portion 44 at its lower end and a worm wheel 4l cut into its upper end. A plug 48 held in place by a pin 41 takes the downward thrust of shaft 43, and the upward thrust is taken by the housing directly against the extreme upper end of the shaft. A horizontally extending shaft 4l with a knurled outer end is rotatably mounted in the housing and has a worm 49 thereon meshing with the worm wheel 4'5, whereby rotation imparted to shaft 48 by the operator is communicated to shaft 43 at a slower rate. A block 8 removably attached to the housing by a screw l, Fig. l1, permits the shaft 48 to be inserted in its bore during assembly, and functions as an abutment for one end of the shaft to take thrust in one direction while the end of the worm bearing against the housing takes thrust in the opposite direction.

A paper boring tool or drill having a hollow bit portion 50 and a hollow shank 5| is removably mounted in the hollow portion 2| at the lower end of the spindle. As shown in Fig. 1 this tool has a tapered shoulder 52 between the shank and the bit, and intermediate the shoulder and the butt end of the shank there is an annular groove 53 which may be rectangular in cross section. At the same elevation as the groove 53 there is an annular groove 54 in the outer wall of the hollow spindle 2l. There is also an opening 55 through the Wall of the spindle communicating with groove 54, and in the shaft of the tool there is a socket 56 extending inwardly from the groove 53 in that member and adapted to register with the opening 55. A spring ring 5l', that is bowed in cross section as shown in Fig. 1, is positioned in the groove 54 and is provided with an inturned rebent end '58 which extends through opening and into groove 53, and when the tool is turned to the proper angular position may be caused to project into the socket 56. 'I'his rebent end 58 forms a retainer which serves not only to support the tool but also to lock it against rotation with respect to the spindle.

The lower end of the hollow spindle is provided with a plurality oi' slots 59 which divide the spindle into chucking jaws 60 that are beveled oif internally to form a tapered seat 6i' complementary to the tapered shoulder 52.

The hollow spindle is threaded externally to receive a clamping collar 8| which has a bevel 75 vthe lower end of the shaft with the housing, and

cam surface at each end. The upper cam surface l2 is adapted to engage the bowed outer surface of ring Il so that when the collar 4is threaded upwardly on the f-spindle the ring I1 is contracted and the retainer portion I! A.may be projected into the socket The lower-cam surface Il is adapted to engage a correspondingly beveled external cam surface I4 on the chucking `Jaws Il. Consequently when the collar is threaded upwardly to the proper extent the two cam surfaces Il and I4 engage each other and force the laws I inwardly. causing the taper surfaces Il' to bear with premure against the tapered shoulder l2 on the tool. The latter pressure tends to force the tool downwardly and thereby causes the tool to pull downwardly upon the retainer. In this way whatever` play there may be between the retainer and the socket in the shank is taken up. At the same time the bevel or taper surfaces accurately center the lower end of the tool shank. Furthermore the taper seat on the spindle takes the thrust of the tool when it enters the paper pile and the spindle transmits it to the thrust bearing 2l.

The replacement of a boring tool involves the loosening of the collar Il which enables the spring ring to expand and its retainer portion 58 to withdraw from the socket 5l and the groove 53. Thereupon a slight downward pull upon the tool. exerted by the operator. will cam the retainer 58 outwardly and permit the tool to be withdrawn. A new tool may then be inserted, that is pushed upwardly as far as it will go into the hollow spindle, when the retainer 5I will enter the groove 5I in the tool shank. The operator now turns the tool through a portion of a revolution until the socket 5I therein comes into register with the opening 5l. The ring will then contract slightly, causing the retainer to partially enter the socket 5l, of which action the operator will become apprised by the sense of feeling if not by a slight audible click. There remains nothing further to be done except to turn up the collar il again, forcing the retainer further into its socket and causing the chucking jaws to exert pressure on the tapered shoulder of the tool.

A modification of the tool chucking means is illustrated in Figs. 12 and 13. In this construction the hollow spindle is not slotted. In its outer wall it has an annular groove preferably semi-circular in cross section in which is mounted a spring ring that is circular or semi-circular in cross section and has an inwardly directed bent end or retainer portion 66 which projects through an opening 61 in the spindle. El is a cavity into which the thumb or finger of the operator may be inserted in order to retract the retainer 66. In the outer wall of the shank 5i there is an annular groove 69 which is cam shaped in cross section. 'I'his groove preferably has a curved bottom which is deeper at the lower side of the groove than at the upper side. The upper part of the groove in fact substantially corresponds in curvature with the cross sectional curvature of the ring I4, so that when the tool is being pulled out of the work it is impossible for the tool to be unintentionally withdrawn from the spindle.

A tapered shoulder 52 on the tool like that on the tool of Fig. l is adapted to engage a similarly shaped taper seat il" on the spindle corresponding to the seat 6| of the Fig. l form. To prevent relative rotation between the spindle and the tool shank 5| there is provided a vertical groove 10 which receives a drive pin 1| mounted 'in the Spindle. Y

When a tool is to be mounted in the spindle the operator' pulls the retainer portion 68 of the spring ring outward far enough to permit the shank of the tool to pass the ring and turns the tool until the groove registers with the pin 1|. Upward pressure on the tool is then continued until the retainer portion 66 of the spring ring snaps into the groove 68. The operator then releases his hold upon the tool and the cam groove 69 acting upon the curved surface of spring ring retainer 66 tends to pull the tool l shank upward and cause the tapered shoulder on the shank to press against the tapered seat 6| and take up any longltudinalplay which would otherwise be present as between the tool and the spindle. In this i'orm of chucking means the vcam groove 69 exerts a pull through the tool shank to cause the tapered shoulder 52 to press against the seat 6|", while in the rst described form of chucking means the compression of the chucking jaws 60 cams the tapered shoulder 52 downwardly to exert a pull through the tool shankon the spring ring 51. In both cases the result is to take up any longitudinal play which would otherwise be present as between the tool and spindle.

Referring now to Figs. 1 and 7, a presser foot 12 is provided for engagement with a pile of paper vP directly adjacent to the tool. In this instance the foot has a hole 13 therein through which the bit 50 of the boring tool projects. 14 is a post or plunger which is preferably square for the greater portion of its length but has a cylindrical lower end thatis threaded into a threaded hole in the foot 12, a lock nut 15 being provided for holding the parts against accidental movement. Near the top and bottom of the housing two blocks 16 and 11 with square openings therethrough for. the reception of the plunger are secured in place by set screws 16 and 19 respectively, and serve as guides for the plunger. These blocks t into a cylindrical bore 80. A third block 8| adapted to slide Within the bore 80 is attached to the plunger 14 by a set screw 82 and forms one abutment for a coil spring 83 which surrounds the plunger, the block 16 constituting the upper abutment for the spring. Block 8| is adjustable. upon the plunger, two indentations 84 being provided to receive the set screw 82 in order that the spring'may be loaded preliminarily to different degrees.

The presser foot 12 with the plunger 14 and the spring 83 function satisfactorily for most of the operations which the machine may be called upon to perform, but occasionally and particularly where soft stock is to be perforated a greater pressure is advisable or necessary. For such purposes we provide an auxiliary presser foot assembly which may be attached to the head or detached therefrom readily and quickly. It comprises top and bottom plates 85 and 86 fastened to the housing by screws 81 and 88, the plates being separated by and welded to a flat post 89. A pin 98 riveted to post 89 projects into a slot 9| in the housing and helps to steady the assembly as well as to take some of the strain by bearing against the upper end of the slot.

A round post or plunger is guided by the plates 85 and 86, the upper plate 85 having a relatively small hole therethrough to accommodate a small diameter portion 92 of the plunger and the lower plate 86 having a relatively large opening therethrough to accommodate a larger diameter portion 93 of the plunger. A coil spring 94 bears at its lower end against the shoulder formed at the Iiuncture or the small'ano large diameter portions of the plunger, and at the other end it bears against the bottom surface oi' plate 86. At the lower end of the plunger 92, 93 there is welded an auxiliary foot 96. At its opposite end this foot is bifurcated so that it may surround the nut 16 on plunger 14, and preferably it carries a pair of pins 96 which extend into holes in the top ofpresser foot 12. The force of spring 94 is thereby added to thatof spring 83, and the force exerted by the presser foot may be doubled or trebled if necessary.

The presser foot 12 of Figs. 9 and 10 is the same in function as the presser foot 12 above described, although it is of slightly dierent form. The plunger 14 and associated parts are identical with the corresponding parts illustrated in Fig. 1 except that for greater convenience a thumb screw 91 is substituted for the set screw 82. and its shank projects entirely through the slot 9|. A thumb screw 81 of course cannot be employed when the auxiliary presser foot is in use.

The operation ofthe drill head will be apparent it is believed from the above description of its parts,v particularly in connection with Patent 2,044,709 above referred to, wherein is shown and described a complete machine adapted to take a head of the kind herein described.` Two, three or more of these heads may be used to form a like number of perforations in a pile of paper or cardboard sheets, and the spindle of each head may be adjusted independently while the machine is running and without the use of hand tools. The drills or boring tools may be changed readily and quickly whenever the necessity arises, and the attachment of the auxiliary presser foot is also quickly effected.

In contradistinctionto the structures of the prior art it is to be especially noted that the hollow portion 2| of the spindle has no internal shoulder such as has been used formerly to absorb the thrust of the boring tool. The elimination of an internal shoulder at this point permits a much greater area within the hollow portion of the spindle to facilitate discharge of the paper drillings or chips. A

Furthermore, the tapered shoulder 6| or 6|" of the boring tool, in addition to absorbing the thrust thereof makes it self-centering and obviates any radial play such as was present in the prior conventional constructions, thus contributing materially to operating efllciency and accuracy of production.

Having thus described our invention, we claim:

1. In a paper perforating machine, a spindle, a boring tool carried thereby, spaced anti-friction bearings for said spindle, a pair of spaced collars on said spindle at a point intermediate said bearings, a slide positioned between said collars, thrust bearings between said slide and each of said collars, and means comprising a screw actuatable by hand during the operation of the machine for moving said slide axially.

2. In a paper perforating machine, a spindle, a boring tool carried thereby, spaced anti-friction bearings for said spindle, a pair of spaced collars on said spindle at a point intermediate said bearings, a slide positioned between said collars, thrust bearings between said slide and each of said collars, means comprising a screw actuatable by hand during the operation of the machine for moving said slide axially, and gauging means for indicating the extent of the slide adjustment.

3. In a paper perforating machine. a spindle head, a spindle adapted to carry a boring tool, a slide surrounding said spindle normally4 ilxed in said head, a collar ilxed to the spindle. a thrust bearing mounted between the collar and said slide, means for micrometrically adjusting the slide axially. and gauging means tor indicating the extent ci the slide adjustment.

4. In a paper pericrating machine, a spindle head, a spindle adapted to carry a boring tool, a slide surrounding said spindle normally iixed in said head, an anti-friction bearing arranged to transmit thrust from said spindle to said slide. means for micrometrically adjusting the slide axially, and gauging means for indicating the extent of the slide adjustment.

5. In a paper pertorating machine, a spindle head, a spindle, a boring tool carried thereby, a collar on said spindle, a slide surrounding said spindle normally fixed in the spindle head, a thrust bearing between said slide and said collar. and means for micrometrically adjusting said slide axially in said head.

6. In a-paper periorating machine, a spindle head, a spindle, a boring tool carried thereby. a pair of spaced collars on said spindle. a slide positioned between said collars normally nxed in the spindle head, a thrust bearing between said slide and each .ot said collars, and means i'or micrometrically adjusting said slide axially in said head.

r1..In a paper perforating machine, a spindle, a boring tool carried thereby, spaced anti-friction bearings for said spindle. a pair of spaced collars on said spindle ata point intermediate said bearings, a slide positioned between said collars, a thrust bearing between said slide and each of said collars, and means for micrometrically adjusting said slide to move said spindle axially in its bearings.

8. In a paper periorating machine, a spindle, a boring tool carried thereby, a spaced anti-friction bearings for said spindle, a pair o! spaced collars on said spindle at a point intermediate said bearings, a slide positioned between said colascenso lars, a thrust bearing between aaidsiide and each ci said collars, and means accessible from the exterior oi.' the machine and actuatabl'e during operation of the latter tor micrometrically moving said slide axially.

9. In a paper periorating machine, a spindle head, a spindle adapted te carry a boring tool, a slide surrounding said spindle normally nxed in the spindle head, a thrust bearing mounted within said slide for engagement with the spindle, and means for micrometrically adjusting the slide l axially in the head.

l0. In a paper periorating machine, a spindle head, a spindle adapted to carry a boring tool, a slide surrounding said spindle normally nxed in the spindle head, an anti-friction bearing arranged to transmit thrust from said spindle to said slide, and means for micrometrically adjusting the slide axially in the head.

11. In a paper perforating machine, a spindle head, a vertical spindle adapted to carry a downwardly directed boring tool, a slide surrounding said spindle normally ilxed in said head. an antifriction bearing arranged to transmit upward thrust from said spindle to said slide, and means for micrometrically adjusting the slide axially in the head.

l2. In a paper periorating machine, a spindle vdie, a slide surrounding said spindle below said collar and normally fixed in said head, a thrust bearing between said slide and said collar, and means for micrometrically adjusting said slide axially in said head.

LEO D. BARLEY.

EDWIN W. BRADMILLER.

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