US931001A - Drilling-machine. - Google Patents

Description

H. E. TEMPLE & 0. L. DOSGH. DRILLING MACHINE.

93 1 APPLICATION FILED APR. 15. 1907.

Patented Aug. 10. 1909.

15 BHEETSSHEET 1 H E. TEMPLE & O. L. BOSCH.

DRILLING MACHINE.

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H. E. TEMPLE & 0. L. DOSGH.

DRILLING MACHINE. APPLIOATION FILED APB..15, 1907.

Patented Aug. 10, 1909.

15 SHEETBSHEET 6 l QR M ww 3 \k, r3 h k6 QN 1K 13 .l

H. E. TEMPLE & O. L. DOSGH.

DRILLINOG MACHINE.

P N AP menu). FILED APR 15 1907 Patented Aug. 10' 1909' 15 SHEETS-SHEET 7.

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2/95 in use a H. E. TEMPLE & 0. L. DOSCH.

DRILLING MACHINE. APPLIOATIONIILBD APB..15, 1907.

Patented Aug. 10. 1909.

15 SHEETS-SHEET 8.

61R); hmsacb H. E. TEMPLE & o. L. DOSGH.

DRILLING MACHINE.

APPLICATION FILED APR.15. 1907.

Patented Aug. 10. 1909.

15 SHEETS-SHEET 10 H E. TEMPLE & 0 L. DOSGH.

DRILLING MACHINE.

APPLICATION FILED ,APR. 15. 1907.

Patented Aug. 10, 1909.

15 SHEETS-SHEET 11.

0 1 I I u I I I a 1 lvihwoaca H. E. TEMPLE & 0.' L. BOSCH.

' DRILLING MACHINE.

APPLICATION FILED APR.15,1907. 93 1,001. Patented Aug. 10. 1909.

15 SHEETS-SHEET 12v Ill] H. E. TEMPLE & 0. L. DOSOH.

DRILLING MACHINE. APPLICATION FILED APR. 15, 1907.

Patented Aug. 10. 1909.

15 SHEETSSHEET 13.

H. E. TEMPLE & 0. L. DOSCH. DRILLING MACHINE.

APPLICATION FILED APR.15. 1907. v 93 1,001. Patented Aug. 10, 1909.

15 SHEBT8SHEET l4.

' H. E. TEMPLE 8: 0. L. BOSCH,

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AAAAAAAAAAAAAAAAA PR. 15, 1907. 931 ,001. Patented Aug. '10, 1909.

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. 3 9- ffi iiiiif iiiwiiiiiiiii 'iiiiiiiiiiii mlllnlmlli lllllllm I ar To all whom it cncem:--

UNITED sTATEs PATENT OFFICE.

HARRY E. TEMPLE, or wEEHAwKEN, NEW

JERSEY, ND OLIVER L. BOSCH, o DAYToN OHIO, ASSIGNOR'S TO THE NATIONAL AUTOMATIGTOOL oo.,-oF DAYTON, OHIO.

nnILLme-momn.

Specification of Lettere- Patent.

' Patentedlug. 10, 1909.

Application filed April 15, 1907. Serial No. 868,126.

Be it known that we, HARRY E. TEMPLE and OLIVER L. Doson, citizens of the United States, residin respectively, at Weehawken, county of l -Iudson, State of New Jersey, and Dayton, county of Montgomery, State of Ohio, have invented certain new and usetul Improvements in Drilling-Machine's; and we do declare the following'to be a full, clear, and: exact descri' tion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, of reference markedthereon, which form a part of this specification- This inventionrelates to an automatic multiple spindle drilling machine, andis an improvement of the automatic multiple spindledrilling machine patented March 8, 1904, No. 753,905, which patent has been assi ed to the National Automatic Tool Co., of ayton, Ohio, vention.

The object of the presentinven'tion is to increase. the utility and effectiveness of the drilling machine of the prior patent, and with. this end in. view the resent invention consists first-in means w ereby five sides on surfaces of a piece to be worked. upon may be drilled at one and the sometime;

secondr-means wherebythe drills on the turret-head may be remo'vedand replaced with greater facility than heretofore; third means whereby the turret-head is indexed more positively and accurately than heretofore; fourth-certainimproved means in the. stantin and stopping mechanism of the machine, fth'means whereby-the turrethead --rotating mechanism and the platen driving mechanism are all controlled through one initial driving medium" at theturrethead; sixth+and certain-improvements in the means for timing the operations of the platen- F g Preceding a more detailed description of the invention reference is made to the ac.- companyingdrawings, of which Figure 1, is a front elevation of the machine. Fig. 2,.is-a rear elevmtioni Fig. 3, is a longitudinal-vertioalrseetionsl elevation on-the line, H of '2. Fig. 4, is-an'enlarged sectional view onthe line H of Fig. 1;- Fig'. 5, is a view'of the starting mechanism, also the. change-speed-.mechand to the letters and figures the assignee of the present in-.

anismfor raising the platen. Fig. 6, is a detail view of the means for raising the laten. Figs. 7 and 8, detailviews of means or indexing the turret-head. Fig. 9, a sectional view on the lineu-u of Fi 7. Fi 10, a right handside elevation of Fig. 7. Fig. 11, a top plan view of the means for indexing the turret-head. Fi 12, a top plan view of the means for fee in the front and rear horizontal drill boxes. @ig. 13, a front elevation of Fig. 12. Fig. 14, an enlarged sectional view onthe line tt of Fig. 13, looking in. the direction of the arrow (a) showing means for feeding the rear horizontal rill box. Fig. 15, an enlarged sectional view on the-line t--t of Fig. 13, looking in the direction of the arrow (6) showing the means for feeding the front horizontaldrill box. Fig. 16, an enlarged top plan view of the side'horizontal drill boxes with their and means for feeding the. same. 1 1- aside elevation of the mechanism of %ig. 16. Fig. 18, an enlarged sectional view of the clutches-and the transfer ears of the horizontal drill boxes; this mec anism is-common to all of the horizontal drill boxes. Fig. 19, a detail view of the spiral gears for rotating the drivin shaft for the side horizontal drill boxes. i 20,- ardetailview of one of the drill rails o the turret-head. Fig. 21,,asectional view on the line i-z"of Fig. 20. Figs. 22 and 23, are detail views of the adjustable spiral gear for theturnet-head drill rails. Fig. 24', is a detail view ofthe laten-indexing. mechanism. Fig. 25, ha detail view of the means for releasing the shot belt oftlie platen-indexing mechanism. 26, is a detail of the shot bolt of the-turret-he'ad indexing mechanism. Fi 27, is a detail view of the clutch contro 1i com and associated parts of the tunreteadi indexin mechanism. Fi 28, isa. top plan view 0 a drill bar with rills, spindles and their gaming, detached from t e-turreiihead. Fig. 29, 1s a side elevation ofthe drill barsli' 'wn in Fig. 28. Ehroughout the specification, similar reference characters indicate corresponding part-s. 211m frame-'wnrk.-This feature of the invention is best illustrated on Sheets 12 and. 3 of? the dmwings where 1 designates thebase plate upon which are mounted two sideplates; 2 and. 3 which are connected at their portion by area cross frame 4 and frontv crossframe 5. The upper porgearin tions of the side platesare connected by the turret-head bearing standards 6. Extending from the left hand side of the machine, and attached to the side plate 3 is a variable speed driving gear frame 7 for supporting the gears for driving the platen. All of the above specified parts are suitably united by bolts and screws.

Turret-head me0ham'sm.This mechanism is best shown in Figs. 1 342021 22-23 and 26, where 8 designates the turrethead frame mounted in the bearing standards 6, and 9 is the front plate of the turrethead extending from the main frame of the turret-head. Extending thro'u 'h the hub 8 of the turret-head is a main riving shaft 1.) having on one end a master gear 11 which engages six small pinions forming transmission gears 12 which in turn, are loosely mounted. upon a transmission shaft 13.

14 and 15 designate two members of a clutch, the former member, to-wi t14 is splined to the, shaft 13, and the latter member to-wit15 is rigidly attached to the transmission gear 12. At this point it will be borne in mind that only those drills on the lower face of the turret-head rotate, and for these drills the clutch devices just referred to are intended, said .clutch devices serving to throw the drills in gear at the proper time,for example; referring to Fig. 1, the lower right hand gear 25 is connected through the clutch members14 and 15 and the pinion 24, therefore, receives movement from the master gear 11. The movable member 14 is provided with an inclosed sprin 16 which normally tends to separate the c utches, and said movable clutch member is connected with a shot bolt 17 which receives a supporting ring 18 at its other extreme end, said supporting ring being attached to the turret-head frame 8. Adapted to engage the extremefree end of the shot bolt 17, is an inclined cam which may be termed a clutch-controlling cam; this cam is on a supporting rod 20 which is slidingly sup orted in an extension of the turrethea bearing standards 6, and said rod is provided with a guide-piece 22 which is rigid thereon and incloses at one end a s ring 21 surounding said rod; this spring hes within the. openin 23 in the bearin standards piece, and t e purposes of sai spring are to maintain a ,suitable contact between the cam 19 and the end of the shot bolt 17 and to ermit said cam to yield when the teeth of respective clutch members 14 and 15 come in alinement, or in such positions that do not permit of an engagement ofthe clutches; w en the clutches are in a position to interlock, the efi'ect of the spring 21 isto move the-shot bolt 17 with the clutch member .14 to such interlocking position.

When the clutchmembers are thrown in as shown in Figs. 4 and 27, the gears 24 and 25 are driven from the master gear and the spindles or drills in the lower position on the turret-head are being driven.

Each of the driving gears 25 is mounted upon a shaft 26 which is journaled at its forwardend in the front plate 9 of the turret-head, and at its rear end in the main turret-head frame 8; and has an anti-friction end thrust bearing 32; upon each of these shafts 26 there are one or more spiral gears 28 which are movable to any suitable point along the shaft 26 and are maintained in such position for the purposes and by the means as follows: 33 designates slotted bars supporting the side frames of the drill rails 34; these slotted bars 33 are rigidly attached to the front'plate 9 of the turret-head and the main turret-head frame 8. The side frames 34 of the drill rails are attached to the slotted bars 33 b means of bolts 33; the heads of said bots working in T slots in the slotted bars 33 which permit of said dril-l rails to be moved along the bars 33 to any position. This adjustment of. the side frames of the drill rails renders necessary the-proper positioning of the spiral gear 28 or the spiral gears 28 if there are more than one upon the shaft 26. This spiral gear 28 is moved and locked in osition through means of a rack bar 27 which extends along one side of the shaft 26 and is adapted to .engage with a toothed key 29 which lies within the opening of the spiral gear and engages the teeth of the rack bar at such times when the spiral gear is in operative position. The toothed key 29 is maintained in such position as shownin Fig.- 23 by means" of a retaining block 30 which ."es within a notch in the hub of said spiral gear-see Fig. 22, and is maintained within said notch or recess by means of a leaf spring 31. In order to release the toothed key 29 from the rack 27 on the shaft and thus permit the spiral gear to be shifted to the desired position, the retaining block 30 is drawn out against the pressure of the spring 31 to a suflicient extent to permit the rack 27 to pass under said block thereby disengaging the teeth of the key 29. Thisspiral gear may be then shifted to the desired osition and again interlocked with. the race 27'by rotating said gear to the proper position to reengagc the rack and the key after which the retaining block 30 is allowed to enter the recess as before. The spiralgear or gears 28 engage a similar gear 44 on an intermediate gear shaft 41 which has bearings in journals 42 and 43 extending from the side plates 34. Geared to the shaft 41 are any number of drills 47 through means of bevel pinions 39, one of which is shown in Fig. 20, said pinion 39 engaging a similar pinion 40 fixed to the upper end of the driving spindle 38 of the drill. The'bevel pinions 39 are splined to the shaft -41 which is shown to be provided with "s line 45.

journa ed in a bearing 35 which is fastened between the edges of the side plates 34 by means .of a lower jam nut 37 and a washer 36-see Fig. 21.: The lower end of the drivi-ng spindle 38 is 46 to receive the upper end of the drill 47,

and the lower" threaded end 50 of said driving spindle receives a clutch nut 48 which incloses a collet 49 which grips the shank of the drill and maintains it rigidly in the socket of. the driving spindle. Placed between the enlarged portion 50 of the driving spindle and the lower end of the bearing 35 is an anti-friction bearin 51. The power is introduced to the machine through the tu-rret-head, being conveyed to the main driving pulley'52 on shaft 10.

Referring to Figs. 28Yand29, the drill,

bar 280 replaces the drill. rail 34 shown in Fig. 20 on the turret-head and is attachable to the turret-head in the same manner as the drill rails 34. These drill bars 280 areutilized in place of the drill rails 34 whenever it is desired to bring the drills 47 closer together than is possible when using the drill rails 34, and'owing to the further fact, that a greater number of drills may be driven from the drill bar. The worm gear 44 shown in Fig. 20 is the same as theworm gear '44 shown in Figs. 28- and 29, but instead of being employed upon the splined shaft 41, isrigidly mounted upon a short shaft 41 that has a'bearing 43 and 281, said bearings 43 and 281 rojec'ting from a side of the drill bar 280. n the end of the shaft 41 opposite the wormgear 44 there -is a bevel gear 40" which engages a similar gear 40 upon a shaft journaled in the drill bar; driven on either side of this main driv ing gear 40* through pinions 282 are a series of drill driving spindles 5283 upon which" said punons 282 are mounted and WlllCh' spindles are mounted in the drill bar sides and receivetbe drills 47. A. suitable number of idlers 284 are employed to transmit movement to the pinions 282 of the outlying drill driving spindles. In Fig. 1, one of these drill bars appears on the turrethead.

rotary indexing plate 53 of the turret-head has a series of peripheral locking recesses 54 anda fixed connection with the hub 8? of the turret-frame 8. .Vhenthe turrethead is indexed, it is held in position by the shot bolt'56 entering a given recess 54. This shot bolt will be referred to further in con nection with its coiiperative devices. The

indexing plate is rotated by means of a The driving spindle as is enlarged and recessed as at Turret her/d indexing mer-I111m's'mr lhc run loosely on the. sha

gear 83 on shaft 84 having bearings 85 in the cross frame 4. A clutch member 82 is fixed to the spiral gear 83, and a cooperating clutch member 8lis splined upon shaft 84, the latter shaft receiving movement from a bevel gear 86 thereon which engages a bevel gear 87 on shaft 88, the latter shaft being journaled in the side frames 3 and 7. Upon the shaft 88 there is a sliding clutch 'member 105* which is adapted to engage with a clutch member 104 fixed to a bevel gear 103, which is loose upon the shaft 88. Engaging the bevel gear 103 is a similar gear 102 on shaft 101 and moving with a pulley 100 on shaft 101 journaled in be rinos in the side. frames 7. The pulley 100 is connected to pulley 98 on the. main driving shaft 10 by a belt 99. It will be understood that when the clutch memare brought in operative relation-when themachine 1S started by means hereinafter described. When the shot bolt 56 is pulled out of the notches 54 in the indexing plate, the clutch members 81 and 82 are brought; into operative relation. The shot bolt 56is' on the upper end of rod t'iT'ha'ving a turn buckle 00 for adjustment, and a spring-58 exerting a normal upward pressure on the shot bolt, said shotbolt rod moving in upper and lower guides 59. The shot bolt is released from theaindexing plate by the descending platen and the following mechanism: Mounted .below the lower platen 100 is an arm 71 having a tripping block 72 ad 'ustable by means of screw 73. Theblock (2 in descending, engages the pivotal trip piece 70 on the arm 69. The trip piece 09 is rigid on rock shaft 38, the latter having bearings in cross frames 4 and 5. Upon the rock shaft 08 there is a segment gear 07" which engages a rack 60 on the front por tion of the shot bolt. Simultaneously with the rocking of the shaft 68, the shot bolt 50 is released from engagement with the indexing plate and the clutch members 81 and 82-41 lg. 10, are thrown in gear, and movement is imparted'to the turret-head.

Extending from the lower portion of the shot bolt are brackets 62and 03 having adjustable screws 64 and 65--Fig. 7. Lying between these adjusting screws is the clutch lever 74' and rock shaft 75. Upon the other end of the rock shaft 75 is the clutch fork '80 which engages the movable clutch member 81, the other clutch member 82 being fixed'to thespiral gear 83 and both of which when free from engagement with the clutch member 81. It will therefore be seen that when the shot bolt 57 descends, the screw 64 will engage the clutch-shifting lever 74 and will cause ment of gear 89 upon sha the clutch members 81 and 82 to engage and will thus cause the spiral'gear 83 to rotate, thereby rotating the turret-head through, as before stated, the spiral gear 89. When the shot bolt enters one of the locking recesses 54 in the turret head through the agency of the spring 58, thelower screw 65 will engage the lever 74 thereby rocking the shaft 75 in the reverse direction to disengage the clutch members 81 and 82. When these operations take place, the turret-head will start and stop suddenly; this renders necessary a cushioning device in the form of a coil spring 94 which surrounds the upper portion of the worm shaft 90 and is inclosed between a washer 95 rigid on the shaft 90 and the bearing 96. The shaft 90 is splined in lower end to ermit free move- 90. The worm gear 89 is pinned to the shaft 90 in order to permit of the slight movement .of the shaft 90 due to the aforesaid causes. It is necessary that the rock .shafl; 75 be held in either position temporarily; that is to say, when the clutch members 81 and 82 are in engagement, the shaft 75 must be held, and likewise when the clutch members are out of enga ement. This retaining device is illus- I 105 and 106'of the have dovetail-connections allowing the up-' ,frame 107 which moves in side trate in Figs. 7 and 9, and consists of a rigid retainer 7 Son the rock shaft 75 and terminating in a pointed end, and a springcdntrolled retainer 77 of similar sha e and.

slidably mounted in a .boss 76 ro ecting from the cross frame 4. On one side of' the spring-controlled retainer there is a pin 79 to prevent it from rotating in the boss. As these retainers are shown in Fig. 9, the points are out of alinement, or one is slightly below the other, and in this position, the clutch members 81 and-82 are out of engagement. When the clutch members are in engagement, the point of retainer 78'will lie above the point of i'etaine'r'77. In order to index the turret-head to different positions and not consecutively, a desired number of the peripheral recesses 54 in the indexing plate 53 are provided; these are closed by the insertion of removable plugs 55, thus permitting/the shot bolt to pass over such closed recesses until it reaches the desired recess. In indexing the turret-head con- .secutively, all of these recesses remain open.

Platen' me0hanism.-Thismechanism is more particularly illustgated in Figs. 13'- (3 and- 24. The upper and lower members platen or work-table,

per member 105 to have independent horizontal movement. These platen members are supported upon a verticall -sliding rames' 2 and 3; mounted u on said sliding frame 107 is a roller 108 which rides upon the riphcry of an' elongated cam 109 which is fixed to a shaft 110 ournaIed in the cross frames 4 and 5. Upon the shaft 110 there is a worm wheel 111 which engages a worm 112 on shaft 113 journaled in the side frames 2-3 and 7. The platen-carrying frame 107 has a variable rising movement to accommodate the different speeds of the drills and the metal to be worked upon. This variable movement of the platen is obtained through the following change-speed mechanism.

Change-speed mechanism for pZate'n .The shaft 88 hasupon it three differential gear wheels 124, 119 :1nd 115; the gearwheel 122 meshes with 124, said \vheel 122 being loose upon the worm shaft 113, and through these gears 122 and 124 the maximum speed is obtained for elevating the platen; the gear wheel 122 has on one side a clutch member 123 which is adapted to be placed in and out of engagement with a clutch member 121 splined on shaft 113. The intermediate speed is obtained through the gear wheel 119 which is of decreased diameter as compared to the wheel 124, said gear wheel 119 enga ing with a gear wheel 118 loose u on shaft 113' and having on one side thereo a clutch member 120, said clutch member 120 being adapted to engage the other clutch 121, the clutch 121 is adapted to be thrown in either direction by a clutch lever 1?6 which will be again referred to. The minimum speed isries a ratchet pawl 117 which engages a ratchet wheel 116 fixed to the shaft 113 and constituting the moving engagement between the'said shaft and the gear wheel 114.

The above-specified change-speed gearin is substantially the same as is shown an described in Letters Patent hereinbefore referred to.

Timing mechanism for pZaten.-The clutchshifting lever 136 is fulcrumed at 133 upon a bracket 135 and is normally held in position by spring 263 to cause the clutch 121 to engage the clutch 123 on the high speed gearing. Pivoted u on the same shaft 133 which forms, as be ore stated, the fulcrum.

of the shifting lever,-is a rocker arm 132,

one end of which engages a roller 134 which rides against the peripheral surfaces of the timing wheel 129 on shaft 128, and the other end of said. rocker arm having a hook 137 .which engages the side pieces-131 on said timing wheel 129. V

131 designates a series of tr' ieces removably attached to theside of 't e rim of the timing wheel 129; these trip pieces are arranged at suitable oints to be engaged by the hook end 137 of the rocker arm 132'; the object of said trip pieces is to trip the rocker arm to rock the shaft 133 to actuate the shifting lever 136 through the engagement of the other end of the rocker arm 132- with the roll stud 134 which is mounted uponwhich is connected to the extended portionof the shifting lever 136,"and the other end of which is connectedtoan upright lever 262.. As the gearing is shownfiin Fig. 5, the

clutch is out of engagement with either of the clutclrmembers 120 and123, and the gearing isin the low speed condition; to bring about this condition, the rocker arm 132 is tripped by one of the trip pieces 131, and to move said clutch devices to the intermediate speed, the trip piece 131* which is shown to have a higher periphery than the trip pieces 131. is in a position to engage the nose 137 ofthe rocker arm. Thetrip pieces 131 and 131 may'have any desired length or depth and may be placed at any desired point to effect the above results.

Arranged around the periphery of the timing wheel are a series of adjustable stop pieces 130, the object and purpose of ,which are to prevent the clutch 121 from" being moved from one extreme position to the other. when it is only desired to move said clutch from one extreme position to its intermediate position, for example, from a connection with. clutch member 123 on the high speed gear to its intermediate position, at which time the low-speed gearing is in operation. This shifting of the clutch takes place when the nose 137 engages one of the trip pieces 131. The clutch lever 136 is thus controlled by the roller 134 engaging one of the peripheral pieces 130. It will be borne in mind that said clutch lever is so controlled by the peripheral pieces 130 when the clutch is thrown from the high speed gear 122 to the intermediateposition of said clutch, at which time, the low speed gear 114 is driven through ratchet pawl 11?, the ratchet wheel Ill; and upper gear 115 on shaftSS and lower gear 114 on shaft 113. When the clutch 1'31 isanoved from engagement with clutch 120 on the intermediate speed gear 118, to the, intermediate position of said clutch 121, said clutch 121 is prevented from moving too far by the nose 137 moving off of thetrip piece 131 onto a trip piece 131. it will be seen that theperiphery of the trip piece 131 is higher than the periphery of the trip pieces 131, and it due to this variation that the clutch is moved from the high speed position shown in Fig. 2, to the intermediate position (not. shown.) As the clutch is shown in Fig. 5, it is out of engagement and the machine is operating under low speed due to the low speed gear 114 being driven directly from the shaft 113 through the ratchetpawl 117 and the ratchet Wheel 116.. The trip and stop pieces 131 13l and 130 may be of any sizes and located at any position to accommodate the desired speeds in the rise of the platen.

It will be understood that when the platen or work-tabledescends, it always moves under the high speed gear, and if it is desired. to again elevate said platen under the same speed, the clutch remains in gear wit-h the high speed gear, but if it is desired to elevate the platen under a slower speed, the clutch disengages from said high speed gear and shifted for the next desired. speed through the engagement of the nose 137 with one of the trip pieces 131 or 131, and after the platen has been elevated to its limit, the clutch reengages the high speed gear to lower it. It will be borne inmind that through the above-described timing mechanism, the platen cam 109 hereinbefore referred to, "is timed to elevate and lower the platen. The shaft 110 of the cam 109' being the shaft upon which is mounted the worm gear 111 which is driven from the change-s 'eed shaft -113see Figs. 5 and 6. The timmg wheel 129 is on shaft 128 which has its bearings in side, frames 3; this shaft is driven from gear wh'eel 127 which receives its movement from the wormwheel 111 through the intermediate gears 125 and 126.

Platen-indewz'ng mec/umism.'lhis mechanism is illustrated in Figs. 1324 and 25. As hereinbefore stated, the upper member 105 of the platen-has a sliding connection -With the lower member as shown in Fig. 3,

and is also provided with a rack 146 on the lower side, and a series of locking recesses 149; engaging the rack is apinion 145 on shaft 147 by means of which the indexing movements are given to the platen either through the hand wheel 148 which is fixed to the shaft of said gear wheel, or the indexing movement is imparted to said platen automatically through the segment gear 143 extending from shaft 110. A pin 144 fixed to the side frame 2 maintains said segment gear in an operative position, said gear being loose upon the shaft 110 and therefore subject to friction due to the moving shaft which always has a tendency to place the segment gear in the position shown in Fig. 24; this segment gear is rocked upon its fulcrum 110 by means of a series of cams 140 engaging a roller 141 and a projection 142 of segment'gear 143; the cams 140 are adjustably mounted in grooves 139 on the face of a disk 138, the latter disk being rigidly mounted on the shaft 128. It will be borne in mind that the shaft 128 also carries the timing wheel and is driven from shaft 110 as shown in Fig. 5. It will be seen from 1, that the disk 138 has six radial

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