CA1128342A - Spindle control mechanism - Google Patents
Spindle control mechanismInfo
- Publication number
- CA1128342A CA1128342A CA339,675A CA339675A CA1128342A CA 1128342 A CA1128342 A CA 1128342A CA 339675 A CA339675 A CA 339675A CA 1128342 A CA1128342 A CA 1128342A
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- Canada
- Prior art keywords
- control
- control knob
- spindle
- rotation
- lathe
- Prior art date
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Abstract
IMPROVED SPINDLE CONTROL MECHANISM
Abstract of the Disclosure An improved spindle control mechanism for a lathe that includes, in preferred form, a rotatable control knob operably related to a plurality of spindle motor control and servo-control switches by a switch drum fixed thereto and operably connected to a spindle transmission through a control shaft by a connector link pivoted in an eccentric position at one end to the control knob and pivoted at the other end to a lever arm fixed to the control shaft. Rotation of the control knob into a forward position simultaneously translates the lathe's transmission into a forward spindle rotation position and starts the spindle drive motor. Rotation of the control knob into an intermediate stop position simultaneously stops the spindle drive motor and acti-vates the spindle servo-control switch (which permits the spindle's rotation speed to be changed by a separate spindle servo-control mechanism, if desired). Rotation of the control knob into a reverse position simultaneously translates the transmission into a reserve spindle rotation position and starts the spindle drive motor.
Abstract of the Disclosure An improved spindle control mechanism for a lathe that includes, in preferred form, a rotatable control knob operably related to a plurality of spindle motor control and servo-control switches by a switch drum fixed thereto and operably connected to a spindle transmission through a control shaft by a connector link pivoted in an eccentric position at one end to the control knob and pivoted at the other end to a lever arm fixed to the control shaft. Rotation of the control knob into a forward position simultaneously translates the lathe's transmission into a forward spindle rotation position and starts the spindle drive motor. Rotation of the control knob into an intermediate stop position simultaneously stops the spindle drive motor and acti-vates the spindle servo-control switch (which permits the spindle's rotation speed to be changed by a separate spindle servo-control mechanism, if desired). Rotation of the control knob into a reverse position simultaneously translates the transmission into a reserve spindle rotation position and starts the spindle drive motor.
Description
33~ ' ~ is invclltion rc~es to lal:hcs. Morc particular]y, this invention relates to an improved spindle control ~echanism for a lathe.
Spindle control mechanisms Eor lathes are, of course, very well known to the prior art. The spindle control mechanism, as known to the prior art, basically controls two functions of the lathe. First, the spindle control mechanism controls the rotation-al direction of the lathe's spindle, i.e., cloc]cwise or counter-l~ clockwise. Second, the spindle control mechanism controls the ; on/off operation of the spindle's drive motor, the motor of course being "on" to rotate the spindle and being "off" to stop , spindle rotation.
The spindle control mechanism of this invention is an improvement, froM a safety standpoint, over one particular spindle control mechanism known to the prior art for manually controlled lathes. In that prior art spindle control mechanism, two levers j are provided adjacent the front longitudinal face of the lathe, I one lever being mounted on the lathe's headstock and the other '¦ lever being mounted on the lathe's carriage (the carriage being longitudinally movable between the lathe's headstock and tail-stock). Both these levers extend forwardly from the front face of the machine for manual control by the lathe's operator. And both the levers are mechanically interconnected by a control shaft.
i~ ~hen either lever is pushed upwardly into a first position, the `i lathe's spindle rotates, e.g., clockwise, and when either lever ! is pushed downwardly into a second position, the spindle rotates, ¦
e.g., coun-terclock~ise.
.-` ' i But tllese forwardly extending manual control levers are subject to being accidentally bumped or kicked by a passerby, or by th~ lathe's operator himself. If such an accidental striking occurs, rotation of the lathe's spindle and, therefore, rotation of the wor];piece on the spindle may be inadvertelltly started.
If this situation happens while the lathe's operator is setting .' ' ~. I
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up a workpiece or replacing the tool on the lathe's carriage~ or is unprepared for spindle rotation for any other reason, the operator may be injured or the equipment itself may be darnaged.
The present invention broadly contemplates an impxoved spindle contxol mechanism for a spindle of a lathe, the rnechanism CQm-prising a manually rot~table primary control knob, the primary control knbb being connected to the lathe, and the primary control knob being rotatable between first, second and third operative positions, connector means connecting the primary control knQb to the lathe's spindle for controlling the rotation attitude of the spindle, the rotation attitude of the spindle being dependent on the operative position of the primary control kncb, and rotation limit structure connected with the primary control knob for selectively defining the rotation limits of the pri-mary knob as desired by the lathe's operator, when the ro-tation limit structure is engaged the rotation limit structure being operable to allow rotation of the control knob between first and second operative positions and to deny rotation of the control knQb between first and third operative positions, and when the rotation limit structure is disengaged the rotation limit structure being operable to allow rotation of the control knQb between first and third operative positions.
In one embodiment the improved spindle control mechanism of this invention includes a manually rotatable primary control knob on the lathe's headstock that is operably related to a plurality of spindle motor control and ser~o-control switches by a switch drum tixed thereto, and is operably connected to a spindle transmission through a control shaft by a primary connector link pivoted in an eccentric position at one end to the control knob and pivoted at -the other end to a primary lever arm fixed to the control shaft~ Rotation of the primary control knob into a forward position simultaneously -translates the lathe's trans-mission into a forward spindle rotation posltion and starts the spindle drive motor. R3tation of the ~L2~3~
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prim~ry con~rol l;nol~ into ~;~ intcrlnc(lia~c stol) pO~;.itiC)II sim~ a-neously stops thc spindle drivc motor ~lld activates thc servo-control switch (which permits the rotation speed of the spindle to be changed by a separate servo~control mechanism, if desired).
Rotation of tlle primary control knob into a reverse position simultaneously translates the transmission into a reverse spindlel rotation position and starts the spindle drive motor. A manually j rotatable secondary control knob is mounted on the lathe's carriage and is connected with the control shaft by a secondary connector link in the same fashion as the primary connector link.
The secondary control knob does not include a switch control drum, but is operationally connected to the spindle motor control and servo-control switches through the control shaft and the primary control knob. Here, rotation of the secondary control knob achieves the same results as rotation of the primary control knob.
Other objectives and advantages of this invention will be more apparent from the following detailed description, taken in eonjunction with the drawings in whieh: j Fiyure 1 is a perspective view illustrating a manually controlled lathe that incorporates the improved spindle control mechanism of this inVentiQn;
Figure 2 is a cross-sectional view taken along line
Spindle control mechanisms Eor lathes are, of course, very well known to the prior art. The spindle control mechanism, as known to the prior art, basically controls two functions of the lathe. First, the spindle control mechanism controls the rotation-al direction of the lathe's spindle, i.e., cloc]cwise or counter-l~ clockwise. Second, the spindle control mechanism controls the ; on/off operation of the spindle's drive motor, the motor of course being "on" to rotate the spindle and being "off" to stop , spindle rotation.
The spindle control mechanism of this invention is an improvement, froM a safety standpoint, over one particular spindle control mechanism known to the prior art for manually controlled lathes. In that prior art spindle control mechanism, two levers j are provided adjacent the front longitudinal face of the lathe, I one lever being mounted on the lathe's headstock and the other '¦ lever being mounted on the lathe's carriage (the carriage being longitudinally movable between the lathe's headstock and tail-stock). Both these levers extend forwardly from the front face of the machine for manual control by the lathe's operator. And both the levers are mechanically interconnected by a control shaft.
i~ ~hen either lever is pushed upwardly into a first position, the `i lathe's spindle rotates, e.g., clockwise, and when either lever ! is pushed downwardly into a second position, the spindle rotates, ¦
e.g., coun-terclock~ise.
.-` ' i But tllese forwardly extending manual control levers are subject to being accidentally bumped or kicked by a passerby, or by th~ lathe's operator himself. If such an accidental striking occurs, rotation of the lathe's spindle and, therefore, rotation of the wor];piece on the spindle may be inadvertelltly started.
If this situation happens while the lathe's operator is setting .' ' ~. I
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up a workpiece or replacing the tool on the lathe's carriage~ or is unprepared for spindle rotation for any other reason, the operator may be injured or the equipment itself may be darnaged.
The present invention broadly contemplates an impxoved spindle contxol mechanism for a spindle of a lathe, the rnechanism CQm-prising a manually rot~table primary control knob, the primary control knbb being connected to the lathe, and the primary control knob being rotatable between first, second and third operative positions, connector means connecting the primary control knQb to the lathe's spindle for controlling the rotation attitude of the spindle, the rotation attitude of the spindle being dependent on the operative position of the primary control kncb, and rotation limit structure connected with the primary control knob for selectively defining the rotation limits of the pri-mary knob as desired by the lathe's operator, when the ro-tation limit structure is engaged the rotation limit structure being operable to allow rotation of the control knob between first and second operative positions and to deny rotation of the control knQb between first and third operative positions, and when the rotation limit structure is disengaged the rotation limit structure being operable to allow rotation of the control knQb between first and third operative positions.
In one embodiment the improved spindle control mechanism of this invention includes a manually rotatable primary control knob on the lathe's headstock that is operably related to a plurality of spindle motor control and ser~o-control switches by a switch drum tixed thereto, and is operably connected to a spindle transmission through a control shaft by a primary connector link pivoted in an eccentric position at one end to the control knob and pivoted at -the other end to a primary lever arm fixed to the control shaft~ Rotation of the primary control knob into a forward position simultaneously -translates the lathe's trans-mission into a forward spindle rotation posltion and starts the spindle drive motor. R3tation of the ~L2~3~
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prim~ry con~rol l;nol~ into ~;~ intcrlnc(lia~c stol) pO~;.itiC)II sim~ a-neously stops thc spindle drivc motor ~lld activates thc servo-control switch (which permits the rotation speed of the spindle to be changed by a separate servo~control mechanism, if desired).
Rotation of tlle primary control knob into a reverse position simultaneously translates the transmission into a reverse spindlel rotation position and starts the spindle drive motor. A manually j rotatable secondary control knob is mounted on the lathe's carriage and is connected with the control shaft by a secondary connector link in the same fashion as the primary connector link.
The secondary control knob does not include a switch control drum, but is operationally connected to the spindle motor control and servo-control switches through the control shaft and the primary control knob. Here, rotation of the secondary control knob achieves the same results as rotation of the primary control knob.
Other objectives and advantages of this invention will be more apparent from the following detailed description, taken in eonjunction with the drawings in whieh: j Fiyure 1 is a perspective view illustrating a manually controlled lathe that incorporates the improved spindle control mechanism of this inVentiQn;
Figure 2 is a cross-sectional view taken along line
2-2 o Figure l;
Fiyure 3 is a cross-sectional view taken along line
Fiyure 3 is a cross-sectional view taken along line
3-3 of Figure 2;
Figure 4 is a cross~sectional view taken along line
Figure 4 is a cross~sectional view taken along line
4-4 o Figure 3;
Figure 5 is a cross-sectional view taken alon~ line
Figure 5 is a cross-sectional view taken alon~ line
5-5 of Figure l; and Fk3urc G is a block diagram illustratin~J thc clcctrical and meehanical interconnection of the improvcd spindle control mechanism with the lathe's spindle.
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The Lml~rovod spindle con~rol mcchallisrn of ~his inven-t-ion is illustrated in combina~ion with a manually controllcd lathe 10, as shown in Figure 1. The lathe 10 includes a bed 11, a headstock 12 and a tailstock 13. The bcd 11 supports a longitud-inally movable carriage 14 which, in turn, supports a transversely movable saddle 15 relative to the longitudinal axis 16 of the lathc. The saddle 14 carries a cutting tool (not shown) for performing cutting operations on a workpiece (not shown) supported between the tailstock 13 and a spindle 17 on the headstock 12.
The headstock 12 includes a housing 18 within which is located a transmission (not shown in detail) for controlling the forward (e.g., clockwise) or reverse (e.g., counterclockwise) rotational direction of the spindle 17. The housing 18 also includes a servo-control mechanism (not shown in detail) for controlling the particular rotational speed of the spindle 17, e.g., 100 rpm, 200 rpm or the like. The particular speèd at which the spindle 17 is rotated is determined by the setting of, for example, a control knob 19 carried by the headstock 12. Further, a drive motor (not shown in detail) provides the power to rotate the spindle 17 in the first instance. The drive motor, txansmission, and servo-control mechanism are all well known to the prior art for manually controlled lathes. I
The improved spindle control mechanism of this inventionj includes primary 20 and secondary 21 control locations. The primary control location 20, as illustrated in Figure 1, is located on the lathe's headstock 12, and the secondary control location 21 is located on the lathe's longitudinally movable carriage 14. Each control location 20, 21 includes a control knob 22, 23, respectively, that is rotational relative to a center¦
axis 24, 25, respectively, those center axes being disposed paralle to the front face and longitudinal axis 16 of the lathe.
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¦ ~oth con~rol knobs 22, 23 are conncc~ed, by ~cans o~ a connector lillkage structure 26, 27, respectivc]y, wi~ll a con~rol slla~t 2~, the control sllaE~ ~cinc3 conncct~d wi~l~ Lllc s~ lo tran~lnissioll, see Figure 6. Only the primary control knob 22, however, is connected with a s~itching structurc 29 tha~ controls the on/of attitude of the spindle's drive motor, and that is electrically connected with the spindle's adjustable speed servo-control mechanism for permitting change of spindle rotation speed when desired, see Figure 6. The secondary control knob 23 is not directly connected with that switching structure 29, but is indirectly connected with it through control shaft 28 as described in greater detail below.
The primary control location 20, as previously mentioned, includes primary control ~nob 22 and is particularly illustrated in Figures 2-4. The primary knob 22 is rota-tionally mounted on axis 24 to primary control housing 29. More particularly, the primary control knob 22 is immobilily ~ixed on a shaft 35 carried in bearing bores 36 and 37 of support walls 3B, 39 which are part of or fixed to the headstock housing 18, see Figure 3. The pri-mary knob 22 is mounted on that portion of the shaft which extends exteriorly of the housing 29, and a switch control drum 40 is immobilily fixed on that portion of the shaEt disposed interiorly of the housing. The primary control knob 22 carries a first portion of a temporary latch that includes a first detent ball 1 41 in bore 34 spaced from but disposed parallel to the knob's ¦! rotational axis 24. That first detent ball 41 is adapted to cooperate with a second portion of a temporary latch that includes~
a plurality of positioning seats 42-46 disposed in arcuate config-~
uration 47 adjacent the periphery of a positioner plate 48, see Figure . The positioner plate 48 is immobilily fixed to the ;:
~z~ l llC~ lc 1~ , W;l l 1 3~ "` ~ "~ 7 1l;-; ;I t (`l~ ?~ --poin~ tllat lies on the lcnob'~ rotatiol-lal a~is 24. T~c first detent ball ~1 is spring ~9 loadecl ayainst the outer surface 50 Il of that positioner plate 48, the spring 49 being maintained in compression by set screw 51 threaded into counterbore 52 of the primary control knob 22. Thus, and as the primary control knob 22 is rotated relative to axis 24 (and, therefore, relative to the positioner plate 48), the first ball 41 is carried, e.g., ' from one seat 42 to another 43, in that positioner plate, the knob's detent ball and the positioner plate's seats 42-46 cooperat-ing to maintain the primary control knob in that position 42-46 selected by the lathe's operator. Thc positioner plate's seats 42-46 correspond with forward, neutral, stop, neutral and reverse rotational positions for the primary control-knob 22 as described in more specific detail below. The forward, neutral, stop, neutral and reverse legends 53 are visibly denoted on the knob's , exterior peripheral surface 54, and these legends 53 cooperate ~i with an im~obile benchmark 55 positioned on the housing 18.
, The primary control knob 22 also includes a selectively~
operable limit pin 60 that limits rotational motion of the control knob when the limit pin is operationally engaged with the posi- !
tioner plate 48, see Figures 3 and 4. The limit pin's axis 59 is disposed parallel to the rotational axis 24 of the knob 22, but lS spaced outwardly therefrom adjacellt the outer periphery of the knob, as particularly illustrated in Figure ~. The limit pin 60, !
' as illustrated in Figure 3, includes an outer or knob end 61 and a working or ~utt end 62 adaptcd to rido in arcua-te limit slot 63 deined in the positioner plate 48, see Figures 3 and ~. The arcl of the arcuate limit slot 63 has a centerpoint that lies on the knob's rotatiollal axis 24. Thc limit pin 60, intcrmediate the ... __._ _ .. _ . . ... . .. ,._ . ._ , . . ... .. _ _ ds 6], ()2 l-l)(?~ o~, incJ~(]e; L~ ?~ (?~ rrc~
engagcrnent recc~ss 65 circumEcren~ially ~efinc~ in thc ~in and spaccd one from another. Thcse rcccsses ~4, 65 arc adaptcd to cooperate with a second spring 66 loaded detent ball 67, the ball ¦
67 cooperating with either recess 64 or 65 to retain the limit pin 60 in the engaged position or non-engaged position, as desired by the lathe's operator, relative to the limit slot 63 in the positioner plate 48. The spring 66 of the second detent ball 67 ;; is retained in the compressive attitude by set screw 68, the bore 69 within which the compression spring and ball are disposed being radially oriented within the knob 22 relative to the a~is 24. The operative or engaging position of the limit pin 60 with the positioner plate's limit slo-t 63 is illustrated in Figure 3. The non-engaging or inoperative position of thc limit pin 60 would be esta~lished if that limit pin were pulled away from the knob 20 so i that second detent ball 67 rested in recess 65 defined by the pin's ;` shaft, thereby removing the pin's butt end 62 from engaging relation with the positioner plate's limit slot 63. The pin 60 is movable between operative and inoperative positions as cam ~ surfaces 70, 71 on the rib 72 separating those two recessed areas cooperate to permit the ball 67 to be moved therebetween agalnst the bias of co~pression spring 66 in response to axial or longi-tudinal motion of the pin 60.
~hen the pin 60 is engaged with the positioner plate's ` limit slot 63, i.e., when the pin is in the operative position as shown in Figures 3 and 4, the limit pin functions to limit the .
rotational movcmcllt of thc control ]cnob 22 ~CtWCCIl thc forward position 42 as shown in Figures 2-4, and the stop position 44, (not shown) since the length ~ of thc arc de~incd by that limit slot is equal to thc lcngth ~' of thc arc dcfincd ~ctwecn the forward positioning seat 92 and the stop positionin~ seat 44 for the primary control knob. When -the pin 60 is not engaged with the~
positioner plate's limit slot 63, i.e., when the pin is in the inoperative position (no-t shown), the primary control knob 22 is free to rotate between the forward position 42 and the reverse position 46 as desired.
The primary control knob 22, as mentionecl earlier, is also directly connected with switch apparatus 29 that controls the on/off attitude of the spindle drive motor as well as con-trols the operability of the spindle speed servo-control mechan-ism, see Figures 3 and 4. An O-ring 74 is received in annular groove 73 around the primary control knob's shaft 35 where that shaft enters the primary control housing 29 through positioner plate 48, thereby closing off the switch chamber 30 mounted to the headstock housing to atmosphere and, hence, to cutting fluids ¦
that may be employed during use of the lathe. The shaft 35 that mounts the primary control knob 22, as illustrated in Figure ¦
3, also mounts the switch control drum 40. The switch control drum 40 carries a forward finger 75, a stop finger 76, a servo-control finger 77 and a reverse finger 78 extending from the surface 79 thereof, spaced one from another along the axial length of that switch control drum, and spaced one from another peri-pherally around that control drum. Each of these fingers 75-78 is adapted to cooperate with a switch forward motor control switch 80, a servo-control switch 81, a stop motor control switch 82 and a reverse motor control switch 83, the switches 80-83 being mounted adjacent one to another in fixed or immobile relation within the headstock housiny 12. The mounti.llc3 structure for the switches 80-83 includes two pins 84 through a rounclal~ an oblong hole in each of the switches ' housings 85, those pins being immobilily connected to walls 38~ 39 at opposed ends, see Figure 4. Each switch 80-83 includes a control button 86 for .
Il 9.
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contact witll a pivot arm 87, tlle pivot arm carrying an idler rollcr 88 Oll ~he free cnd ~llat is conta~tcd ~y the related control drum finger 75, 76, 77 or 7~. ~s illustrated particularly in Figure 4, note that the control drum's forward 75 and reverse 78 actuator fingers are spaced one from another on the drum's peripheral surface an arcuate distance D equal to the arcuate distance D' between the forward 42 and reverse 46 seat on the positioner plate 48. Note also that the servo-control 77 and stop 76 actuator fingers are in line one with another on the drum's peripheral surface and are located between the forward 75 and reverse 78 ~ingers on that control drum 40 surface, thereby simultaneously activating the drive mo-tor stop switch 82 and the servo-control switch 81 when the primary con-trol knob's detent ball 41 is disposed in the positioner plate's stop seat 44 of the positioner plate. The central drum's servo-control 77 and stop 76 fingers are located midway between the forward 75 and reverse 78 fingers on the drum's surface when viewed axially, as shown in Figure 4.
The primary control knob 22 is also connected to a splined control shaft 28 (and, thereby, to the spindle's trans-mission) through primary connector linkage structure 26 as previously mentioned, see Figure 2. The linkaye structure 27 includes a prirnary connector lever 31 which, through collar 32, is fixed to and extends radially from the control shaft 28. The linkage structure 27 also includes a primary connector lin]c 33 pivotally connected at one end by pin 56 to the primary control knob 22, scc ~i~ures 2 ~nd 3, and pivotally conllectc~d at tho othcr end by pin 39 to the free end of connector lever 31. Note the pivot pin 5G connection of the ,connector link 33 to the control knob 22 is eccentric to the rotational axis 24 of that knob. As viewed in Figure 2, it can be seen that rotation of the primary ~ ln -,.
~Z~39t;2 control knol) 22 causcs ro~a ion of ~llc coll~rol sl)art 28 ~Ct~JCell a forward position througll a s~op position to a rcvcrsc position through the connector linkage structure 26 comprise~ of connector link 33 and connector lever 31.
The secondary control knob 23 is particularly illustrated in Figure 5. The secondary control knob 23 is connected by secondary connector linkage structure 27 to the splined control shaft 28 (which shaft 28 is oriented parallel to the lathe's axis 16). The secondary connector linkage structure includes a secon-dary control knob 23 at one end and pivotally mounted as by pin 90 to the free end of a secondary connector lever 91 on the control shaft 28. Note the pivot pin 58 connection of the con-nector link 57 to the control knob 23 mounted through collar 92 is eccentric to the rotational axis 25 of that knob. Note also the connector lever's splined collar 92 pcrmits that lever to slide or move axially or longitudinally of the control shaft 28 (as the lathe's carriage 14 is so moved, but prevents rotation of the lever 91 relative to the control shaft 28. The secondary control knob 23 also carries the forward, neutral, stop, neutral, !
Eorward legends 93 visibly thereon, which legends are positioned to cooperate with an immobile benchmark 94 on the carriage 14 for locating the secondary control knob 23 in the desired positionO
The secondary control knob 23 does not cooperate directly with the switching apparatus 29 that is directly connected with the primary control knob 22 as shown in Figure 3. The secondary control knob 23 is, however, indirectly connected with the swltching apparatus 29 ~ack throu~JII tllc sccondary conncctor link~(3c 27, contl-ol sh~ft 28 and primary connector linkage 2G. Hellce, rotation of the sccondary control knob 23 from, for example, the forward to the stop attitudc or vice versa causes an identical rotation in the '. I
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primary control knob 22 ancl hcllce, indirect]y operates s~,litching apparatus 2~. ~urtl~c~, suc}~ ro~at~ r s((c)l~(lary c-~n~rol knob 23 locates tlle primary control knob's detent ball ql in the appropriate seat 42-46 of positioner plate 48, the primary control knob latch structure 41-46 thereby restraining both the secondary 23 and primary 22 control knobs in the selected rotational position.
Use of the primary control knob 22 is shown in Figures 2-4. ~7hen the primary control knob 22 is in the forward position (as shown in Figures 2-4), the primary connector link 33 cooperates ' with the primary lever 31 to rotate the control shaft 28 into a forward position, as illustrated, and that forward position of the control shaft translates the spindle 17 transmission into a forward operational position so that the spindle rotates in a ` forward (e.g., clockwise) direction. The primary control knob 22 is positively located in the forward position when the limit pin 60 is operationally engaged with the positioner plate's limit slot , 63 through cooperation of the pinls butt end 62 with the slot's forward end 98, as particularly shown in Figures 3 and 4. The primary 22 control knob is restrained in the foxward position because spring 49 biased ball 41 detent is seated in the position~
er plate's forward seat 42. Also, and when the primary control knob 22 is in the forward position, forward fin~er 75 on the switch control drum 40 turns on the spindle drive motor by activating off/on motor switch 80, thereby causin~ forward rotation of the spindle 17.
Whcn the primary control ~nob 22 is moved to a first neutral position as established through cooperation of the master ' control knob's spring biased ball 41 detent with neutral seat 43 on the positioner plate 48 (which neutral seat 43 is positioned . _ .
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~etwc~ll the forwar~ 42 a~ 'op ~ seat!; On ~llat po;itiol~cr plate), the connector link 33 coopeL-ales wi~l) tl~c coll~rol shaft 28 to rotate that sllaft into a neutr~l position whcre the trans-mission disencJages the spindle 17 from driving interconnection with the drive motor. In tllis neutral posi tiOII, the spindle 17 is, free to be manually rotated if desired for repositioning of the workpiece relative to the lathe's CUttillC3 tool (not shown) while the drive motor rcmains on.
~hen the primary control knob 22 is rotated about axis 24 into the stop position (which position is established by spring loaded ball detent 41 interengagin~ stop seat 44 on the positioner plate 48), the limit pin's but-t end 62 cooperates with the limit slot's stop end 99 to locate positively the control knob in that position. In the stop 44 attitude, the knob 22 , locates the primary connector link 33 and, hence,the control shaft 28 in the stop attitude so tllat the transmission is in neutral and locates the control drum 40 so that stop finger 76 activates the stop switch 82, thereby turning off the spindle 17 drive motor-. Also, and when the primary control knob 22 is in the stop attitude, the servo-control mechanism switch 81 is activated. ~ctivation of this switch 81 permits the speed change or servo-control mechanism to function so as to change the rotation speed of the spindle 17 from a higll speed to a low speed or vice versa. The servo-control switch 81 is, therefore, in the ¦
nature of a safety switch that prevents operation of the speed change mechanism by which the rotational speed of the spindle 17 i5 varicd ~ hO contJ~oJ 1;nObS 22, 23 arC ;ll thc stol) ~t~i~ndc (at whic}l position the spindle's drive motor is turncd off). In ' normal operation, the forward 42 and stop 44 positions arc the most common pOSitiOIIS of thc primary control knob 22 (as wcll as, I
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of coursc, of l:l~e s(~cvllclary corl~oJ kllob 23) I)ec~ ;e thc sl~in~]c 17 is norlnally ro~ate(l in only a sin(Jle (~irection e~ccr~ in thc case of unusual worlcpiecc-~orllling circum;~allccs. 'L']lU~, an~
normally, the limit pin 60 is maintained in the positioner plate 48 engaging or operative position illustrated in Figures 3 and 4 so that the lathe operator does not inadvertently bypass the stop 44 position to the reverse position 46, and so that the forward 42 and stop 44 positions for the control knobs 22, 23 are firmly defined.
When it is desired to reverse the rotational direction of the spindle 17 (to, e.g., a counterclockwise dircction) the limit pin 60 is first pulled outwardly from that attitude illus-trated in Figure 3 into that attitude where the spring biased second ball 67 is received in the pin's recess 65. The limit pin 60 is thereby restrained in that inoperative or disengaged attitude relative to the positioner plate 48 because the spring biased second ball 67 so holds it in the inoperative position (not sho~n). This permits the primary control knob 22 to rotate counterclockwise (as shown in the Figures) from the stop attitude past the neutral 45 position into the reverse position 46. In the reverse position, the primary control knob's detent ball 41 co-operates with reverse seat 46 in the positioner plate 48, thereby maintaining the prirnary control knob 22 in the reverse attitude.
And when the primary control knob 22 is in the reverse pOSitiOJl 46, the spindle's drive motor is activated because switch control¦
drum's reverse finger 78 has activated reverse motor switch 83 to turn that drive motor on. Further, and in -that reverse attitude 46, the primary conllcctor link 33 has becn repositiolled so that the control shaft 28 has been rotated into a reverse position. In this reverse position of the cohtrol shaft 28, the transmission has been changed so that spindle 17 rotates in a reverse directioF.
i ~8~42 Sucll .~ revorsc dircc~ioll ro'lliol~ of ~lle !:pill(~l~ l7 m~ly l"~ i desirable wh~n, for c~;~.arnp~e, ch~;in(J l:hrc~cls on ~ sll~ft ~orlcpiec:~
if the lathe is being used to form threads on that workpiece.
When the primary control knob 22 is rotated back from the reverse ~fi position toward the stop 44 position, or vice versa, it may be permitted to stop in a neutral 45 position which is similar to the neutral 43 position established between the forward 42 and stop 44 positions of the control knob. In this second neutral 45 position, and as in the first neutral 43 posi-tion, the spindle's drive motor is disengaged from driving relation with the spindle through the transmission, but the spindle 17 is free to be manually turned. Once reverse rotation of the spindle 17 is no longer desired, and after the primary control knob 22 has been re-established in the stop 44 position, the limit ; pin 60 may be pushed inward so that the limit pin's butt end 62 once again operationally engages the positioner plate's limit slot 63 in that attitude illustrated in Fi~ure 3.
The secondary control knob 23 functions in the same manner às does the primary control knob 22 in that it, also, operates the spindle's transmission between forward, neutral and reverse pOsitiolls through rotation of that secondary control knob.
Further, the forward, neutral, stop, neutral, reverse positions of the secondary control knob 23 are established by virtue of the fact that the rotational motion of the secondary control knob is translated back to the primary control knob's la-tch structure 41-46 through the control shaft 28. Further, and in order to rotate the secondary control knob 23 from the stop 44 through the neutral 45 to the reverse 46 and back throucJIl the neutral to the stop positions, the limit pin 60 on the primary control knob 22 must bc pulled out as previously described.
l~aving described in detail the preferr~d embodimcnt (~
my invention, what I desire to claim and protect by Letters Patent is:
~ ..
.. . ... . . . ..
.
The Lml~rovod spindle con~rol mcchallisrn of ~his inven-t-ion is illustrated in combina~ion with a manually controllcd lathe 10, as shown in Figure 1. The lathe 10 includes a bed 11, a headstock 12 and a tailstock 13. The bcd 11 supports a longitud-inally movable carriage 14 which, in turn, supports a transversely movable saddle 15 relative to the longitudinal axis 16 of the lathc. The saddle 14 carries a cutting tool (not shown) for performing cutting operations on a workpiece (not shown) supported between the tailstock 13 and a spindle 17 on the headstock 12.
The headstock 12 includes a housing 18 within which is located a transmission (not shown in detail) for controlling the forward (e.g., clockwise) or reverse (e.g., counterclockwise) rotational direction of the spindle 17. The housing 18 also includes a servo-control mechanism (not shown in detail) for controlling the particular rotational speed of the spindle 17, e.g., 100 rpm, 200 rpm or the like. The particular speèd at which the spindle 17 is rotated is determined by the setting of, for example, a control knob 19 carried by the headstock 12. Further, a drive motor (not shown in detail) provides the power to rotate the spindle 17 in the first instance. The drive motor, txansmission, and servo-control mechanism are all well known to the prior art for manually controlled lathes. I
The improved spindle control mechanism of this inventionj includes primary 20 and secondary 21 control locations. The primary control location 20, as illustrated in Figure 1, is located on the lathe's headstock 12, and the secondary control location 21 is located on the lathe's longitudinally movable carriage 14. Each control location 20, 21 includes a control knob 22, 23, respectively, that is rotational relative to a center¦
axis 24, 25, respectively, those center axes being disposed paralle to the front face and longitudinal axis 16 of the lathe.
-5- i :, 1, llZh34Z
¦ ~oth con~rol knobs 22, 23 are conncc~ed, by ~cans o~ a connector lillkage structure 26, 27, respectivc]y, wi~ll a con~rol slla~t 2~, the control sllaE~ ~cinc3 conncct~d wi~l~ Lllc s~ lo tran~lnissioll, see Figure 6. Only the primary control knob 22, however, is connected with a s~itching structurc 29 tha~ controls the on/of attitude of the spindle's drive motor, and that is electrically connected with the spindle's adjustable speed servo-control mechanism for permitting change of spindle rotation speed when desired, see Figure 6. The secondary control knob 23 is not directly connected with that switching structure 29, but is indirectly connected with it through control shaft 28 as described in greater detail below.
The primary control location 20, as previously mentioned, includes primary control ~nob 22 and is particularly illustrated in Figures 2-4. The primary knob 22 is rota-tionally mounted on axis 24 to primary control housing 29. More particularly, the primary control knob 22 is immobilily ~ixed on a shaft 35 carried in bearing bores 36 and 37 of support walls 3B, 39 which are part of or fixed to the headstock housing 18, see Figure 3. The pri-mary knob 22 is mounted on that portion of the shaft which extends exteriorly of the housing 29, and a switch control drum 40 is immobilily fixed on that portion of the shaEt disposed interiorly of the housing. The primary control knob 22 carries a first portion of a temporary latch that includes a first detent ball 1 41 in bore 34 spaced from but disposed parallel to the knob's ¦! rotational axis 24. That first detent ball 41 is adapted to cooperate with a second portion of a temporary latch that includes~
a plurality of positioning seats 42-46 disposed in arcuate config-~
uration 47 adjacent the periphery of a positioner plate 48, see Figure . The positioner plate 48 is immobilily fixed to the ;:
~z~ l llC~ lc 1~ , W;l l 1 3~ "` ~ "~ 7 1l;-; ;I t (`l~ ?~ --poin~ tllat lies on the lcnob'~ rotatiol-lal a~is 24. T~c first detent ball ~1 is spring ~9 loadecl ayainst the outer surface 50 Il of that positioner plate 48, the spring 49 being maintained in compression by set screw 51 threaded into counterbore 52 of the primary control knob 22. Thus, and as the primary control knob 22 is rotated relative to axis 24 (and, therefore, relative to the positioner plate 48), the first ball 41 is carried, e.g., ' from one seat 42 to another 43, in that positioner plate, the knob's detent ball and the positioner plate's seats 42-46 cooperat-ing to maintain the primary control knob in that position 42-46 selected by the lathe's operator. Thc positioner plate's seats 42-46 correspond with forward, neutral, stop, neutral and reverse rotational positions for the primary control-knob 22 as described in more specific detail below. The forward, neutral, stop, neutral and reverse legends 53 are visibly denoted on the knob's , exterior peripheral surface 54, and these legends 53 cooperate ~i with an im~obile benchmark 55 positioned on the housing 18.
, The primary control knob 22 also includes a selectively~
operable limit pin 60 that limits rotational motion of the control knob when the limit pin is operationally engaged with the posi- !
tioner plate 48, see Figures 3 and 4. The limit pin's axis 59 is disposed parallel to the rotational axis 24 of the knob 22, but lS spaced outwardly therefrom adjacellt the outer periphery of the knob, as particularly illustrated in Figure ~. The limit pin 60, !
' as illustrated in Figure 3, includes an outer or knob end 61 and a working or ~utt end 62 adaptcd to rido in arcua-te limit slot 63 deined in the positioner plate 48, see Figures 3 and ~. The arcl of the arcuate limit slot 63 has a centerpoint that lies on the knob's rotatiollal axis 24. Thc limit pin 60, intcrmediate the ... __._ _ .. _ . . ... . .. ,._ . ._ , . . ... .. _ _ ds 6], ()2 l-l)(?~ o~, incJ~(]e; L~ ?~ (?~ rrc~
engagcrnent recc~ss 65 circumEcren~ially ~efinc~ in thc ~in and spaccd one from another. Thcse rcccsses ~4, 65 arc adaptcd to cooperate with a second spring 66 loaded detent ball 67, the ball ¦
67 cooperating with either recess 64 or 65 to retain the limit pin 60 in the engaged position or non-engaged position, as desired by the lathe's operator, relative to the limit slot 63 in the positioner plate 48. The spring 66 of the second detent ball 67 ;; is retained in the compressive attitude by set screw 68, the bore 69 within which the compression spring and ball are disposed being radially oriented within the knob 22 relative to the a~is 24. The operative or engaging position of the limit pin 60 with the positioner plate's limit slo-t 63 is illustrated in Figure 3. The non-engaging or inoperative position of thc limit pin 60 would be esta~lished if that limit pin were pulled away from the knob 20 so i that second detent ball 67 rested in recess 65 defined by the pin's ;` shaft, thereby removing the pin's butt end 62 from engaging relation with the positioner plate's limit slot 63. The pin 60 is movable between operative and inoperative positions as cam ~ surfaces 70, 71 on the rib 72 separating those two recessed areas cooperate to permit the ball 67 to be moved therebetween agalnst the bias of co~pression spring 66 in response to axial or longi-tudinal motion of the pin 60.
~hen the pin 60 is engaged with the positioner plate's ` limit slot 63, i.e., when the pin is in the operative position as shown in Figures 3 and 4, the limit pin functions to limit the .
rotational movcmcllt of thc control ]cnob 22 ~CtWCCIl thc forward position 42 as shown in Figures 2-4, and the stop position 44, (not shown) since the length ~ of thc arc de~incd by that limit slot is equal to thc lcngth ~' of thc arc dcfincd ~ctwecn the forward positioning seat 92 and the stop positionin~ seat 44 for the primary control knob. When -the pin 60 is not engaged with the~
positioner plate's limit slot 63, i.e., when the pin is in the inoperative position (no-t shown), the primary control knob 22 is free to rotate between the forward position 42 and the reverse position 46 as desired.
The primary control knob 22, as mentionecl earlier, is also directly connected with switch apparatus 29 that controls the on/off attitude of the spindle drive motor as well as con-trols the operability of the spindle speed servo-control mechan-ism, see Figures 3 and 4. An O-ring 74 is received in annular groove 73 around the primary control knob's shaft 35 where that shaft enters the primary control housing 29 through positioner plate 48, thereby closing off the switch chamber 30 mounted to the headstock housing to atmosphere and, hence, to cutting fluids ¦
that may be employed during use of the lathe. The shaft 35 that mounts the primary control knob 22, as illustrated in Figure ¦
3, also mounts the switch control drum 40. The switch control drum 40 carries a forward finger 75, a stop finger 76, a servo-control finger 77 and a reverse finger 78 extending from the surface 79 thereof, spaced one from another along the axial length of that switch control drum, and spaced one from another peri-pherally around that control drum. Each of these fingers 75-78 is adapted to cooperate with a switch forward motor control switch 80, a servo-control switch 81, a stop motor control switch 82 and a reverse motor control switch 83, the switches 80-83 being mounted adjacent one to another in fixed or immobile relation within the headstock housiny 12. The mounti.llc3 structure for the switches 80-83 includes two pins 84 through a rounclal~ an oblong hole in each of the switches ' housings 85, those pins being immobilily connected to walls 38~ 39 at opposed ends, see Figure 4. Each switch 80-83 includes a control button 86 for .
Il 9.
~Z~3~
contact witll a pivot arm 87, tlle pivot arm carrying an idler rollcr 88 Oll ~he free cnd ~llat is conta~tcd ~y the related control drum finger 75, 76, 77 or 7~. ~s illustrated particularly in Figure 4, note that the control drum's forward 75 and reverse 78 actuator fingers are spaced one from another on the drum's peripheral surface an arcuate distance D equal to the arcuate distance D' between the forward 42 and reverse 46 seat on the positioner plate 48. Note also that the servo-control 77 and stop 76 actuator fingers are in line one with another on the drum's peripheral surface and are located between the forward 75 and reverse 78 ~ingers on that control drum 40 surface, thereby simultaneously activating the drive mo-tor stop switch 82 and the servo-control switch 81 when the primary con-trol knob's detent ball 41 is disposed in the positioner plate's stop seat 44 of the positioner plate. The central drum's servo-control 77 and stop 76 fingers are located midway between the forward 75 and reverse 78 fingers on the drum's surface when viewed axially, as shown in Figure 4.
The primary control knob 22 is also connected to a splined control shaft 28 (and, thereby, to the spindle's trans-mission) through primary connector linkage structure 26 as previously mentioned, see Figure 2. The linkaye structure 27 includes a prirnary connector lever 31 which, through collar 32, is fixed to and extends radially from the control shaft 28. The linkage structure 27 also includes a primary connector lin]c 33 pivotally connected at one end by pin 56 to the primary control knob 22, scc ~i~ures 2 ~nd 3, and pivotally conllectc~d at tho othcr end by pin 39 to the free end of connector lever 31. Note the pivot pin 5G connection of the ,connector link 33 to the control knob 22 is eccentric to the rotational axis 24 of that knob. As viewed in Figure 2, it can be seen that rotation of the primary ~ ln -,.
~Z~39t;2 control knol) 22 causcs ro~a ion of ~llc coll~rol sl)art 28 ~Ct~JCell a forward position througll a s~op position to a rcvcrsc position through the connector linkage structure 26 comprise~ of connector link 33 and connector lever 31.
The secondary control knob 23 is particularly illustrated in Figure 5. The secondary control knob 23 is connected by secondary connector linkage structure 27 to the splined control shaft 28 (which shaft 28 is oriented parallel to the lathe's axis 16). The secondary connector linkage structure includes a secon-dary control knob 23 at one end and pivotally mounted as by pin 90 to the free end of a secondary connector lever 91 on the control shaft 28. Note the pivot pin 58 connection of the con-nector link 57 to the control knob 23 mounted through collar 92 is eccentric to the rotational axis 25 of that knob. Note also the connector lever's splined collar 92 pcrmits that lever to slide or move axially or longitudinally of the control shaft 28 (as the lathe's carriage 14 is so moved, but prevents rotation of the lever 91 relative to the control shaft 28. The secondary control knob 23 also carries the forward, neutral, stop, neutral, !
Eorward legends 93 visibly thereon, which legends are positioned to cooperate with an immobile benchmark 94 on the carriage 14 for locating the secondary control knob 23 in the desired positionO
The secondary control knob 23 does not cooperate directly with the switching apparatus 29 that is directly connected with the primary control knob 22 as shown in Figure 3. The secondary control knob 23 is, however, indirectly connected with the swltching apparatus 29 ~ack throu~JII tllc sccondary conncctor link~(3c 27, contl-ol sh~ft 28 and primary connector linkage 2G. Hellce, rotation of the sccondary control knob 23 from, for example, the forward to the stop attitudc or vice versa causes an identical rotation in the '. I
~L~Z~3~%
primary control knob 22 ancl hcllce, indirect]y operates s~,litching apparatus 2~. ~urtl~c~, suc}~ ro~at~ r s((c)l~(lary c-~n~rol knob 23 locates tlle primary control knob's detent ball ql in the appropriate seat 42-46 of positioner plate 48, the primary control knob latch structure 41-46 thereby restraining both the secondary 23 and primary 22 control knobs in the selected rotational position.
Use of the primary control knob 22 is shown in Figures 2-4. ~7hen the primary control knob 22 is in the forward position (as shown in Figures 2-4), the primary connector link 33 cooperates ' with the primary lever 31 to rotate the control shaft 28 into a forward position, as illustrated, and that forward position of the control shaft translates the spindle 17 transmission into a forward operational position so that the spindle rotates in a ` forward (e.g., clockwise) direction. The primary control knob 22 is positively located in the forward position when the limit pin 60 is operationally engaged with the positioner plate's limit slot , 63 through cooperation of the pinls butt end 62 with the slot's forward end 98, as particularly shown in Figures 3 and 4. The primary 22 control knob is restrained in the foxward position because spring 49 biased ball 41 detent is seated in the position~
er plate's forward seat 42. Also, and when the primary control knob 22 is in the forward position, forward fin~er 75 on the switch control drum 40 turns on the spindle drive motor by activating off/on motor switch 80, thereby causin~ forward rotation of the spindle 17.
Whcn the primary control ~nob 22 is moved to a first neutral position as established through cooperation of the master ' control knob's spring biased ball 41 detent with neutral seat 43 on the positioner plate 48 (which neutral seat 43 is positioned . _ .
3~Z
~etwc~ll the forwar~ 42 a~ 'op ~ seat!; On ~llat po;itiol~cr plate), the connector link 33 coopeL-ales wi~l) tl~c coll~rol shaft 28 to rotate that sllaft into a neutr~l position whcre the trans-mission disencJages the spindle 17 from driving interconnection with the drive motor. In tllis neutral posi tiOII, the spindle 17 is, free to be manually rotated if desired for repositioning of the workpiece relative to the lathe's CUttillC3 tool (not shown) while the drive motor rcmains on.
~hen the primary control knob 22 is rotated about axis 24 into the stop position (which position is established by spring loaded ball detent 41 interengagin~ stop seat 44 on the positioner plate 48), the limit pin's but-t end 62 cooperates with the limit slot's stop end 99 to locate positively the control knob in that position. In the stop 44 attitude, the knob 22 , locates the primary connector link 33 and, hence,the control shaft 28 in the stop attitude so tllat the transmission is in neutral and locates the control drum 40 so that stop finger 76 activates the stop switch 82, thereby turning off the spindle 17 drive motor-. Also, and when the primary control knob 22 is in the stop attitude, the servo-control mechanism switch 81 is activated. ~ctivation of this switch 81 permits the speed change or servo-control mechanism to function so as to change the rotation speed of the spindle 17 from a higll speed to a low speed or vice versa. The servo-control switch 81 is, therefore, in the ¦
nature of a safety switch that prevents operation of the speed change mechanism by which the rotational speed of the spindle 17 i5 varicd ~ hO contJ~oJ 1;nObS 22, 23 arC ;ll thc stol) ~t~i~ndc (at whic}l position the spindle's drive motor is turncd off). In ' normal operation, the forward 42 and stop 44 positions arc the most common pOSitiOIIS of thc primary control knob 22 (as wcll as, I
I
3~;~
of coursc, of l:l~e s(~cvllclary corl~oJ kllob 23) I)ec~ ;e thc sl~in~]c 17 is norlnally ro~ate(l in only a sin(Jle (~irection e~ccr~ in thc case of unusual worlcpiecc-~orllling circum;~allccs. 'L']lU~, an~
normally, the limit pin 60 is maintained in the positioner plate 48 engaging or operative position illustrated in Figures 3 and 4 so that the lathe operator does not inadvertently bypass the stop 44 position to the reverse position 46, and so that the forward 42 and stop 44 positions for the control knobs 22, 23 are firmly defined.
When it is desired to reverse the rotational direction of the spindle 17 (to, e.g., a counterclockwise dircction) the limit pin 60 is first pulled outwardly from that attitude illus-trated in Figure 3 into that attitude where the spring biased second ball 67 is received in the pin's recess 65. The limit pin 60 is thereby restrained in that inoperative or disengaged attitude relative to the positioner plate 48 because the spring biased second ball 67 so holds it in the inoperative position (not sho~n). This permits the primary control knob 22 to rotate counterclockwise (as shown in the Figures) from the stop attitude past the neutral 45 position into the reverse position 46. In the reverse position, the primary control knob's detent ball 41 co-operates with reverse seat 46 in the positioner plate 48, thereby maintaining the prirnary control knob 22 in the reverse attitude.
And when the primary control knob 22 is in the reverse pOSitiOJl 46, the spindle's drive motor is activated because switch control¦
drum's reverse finger 78 has activated reverse motor switch 83 to turn that drive motor on. Further, and in -that reverse attitude 46, the primary conllcctor link 33 has becn repositiolled so that the control shaft 28 has been rotated into a reverse position. In this reverse position of the cohtrol shaft 28, the transmission has been changed so that spindle 17 rotates in a reverse directioF.
i ~8~42 Sucll .~ revorsc dircc~ioll ro'lliol~ of ~lle !:pill(~l~ l7 m~ly l"~ i desirable wh~n, for c~;~.arnp~e, ch~;in(J l:hrc~cls on ~ sll~ft ~orlcpiec:~
if the lathe is being used to form threads on that workpiece.
When the primary control knob 22 is rotated back from the reverse ~fi position toward the stop 44 position, or vice versa, it may be permitted to stop in a neutral 45 position which is similar to the neutral 43 position established between the forward 42 and stop 44 positions of the control knob. In this second neutral 45 position, and as in the first neutral 43 posi-tion, the spindle's drive motor is disengaged from driving relation with the spindle through the transmission, but the spindle 17 is free to be manually turned. Once reverse rotation of the spindle 17 is no longer desired, and after the primary control knob 22 has been re-established in the stop 44 position, the limit ; pin 60 may be pushed inward so that the limit pin's butt end 62 once again operationally engages the positioner plate's limit slot 63 in that attitude illustrated in Fi~ure 3.
The secondary control knob 23 functions in the same manner às does the primary control knob 22 in that it, also, operates the spindle's transmission between forward, neutral and reverse pOsitiolls through rotation of that secondary control knob.
Further, the forward, neutral, stop, neutral, reverse positions of the secondary control knob 23 are established by virtue of the fact that the rotational motion of the secondary control knob is translated back to the primary control knob's la-tch structure 41-46 through the control shaft 28. Further, and in order to rotate the secondary control knob 23 from the stop 44 through the neutral 45 to the reverse 46 and back throucJIl the neutral to the stop positions, the limit pin 60 on the primary control knob 22 must bc pulled out as previously described.
l~aving described in detail the preferr~d embodimcnt (~
my invention, what I desire to claim and protect by Letters Patent is:
~ ..
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved spindle control mechanism for a spindle of a lathe, said mechanism comprising a manually rotatable primary control knob, said primary control knob being connected to said lathe, and said primary control knob being rotatable between first, second and third oper-ative positions, connector means connecting said primary control knob to said lathe's spindle for controlling the rotation attitude of said spindle, the rotation attitude of said spindle being dependent on the operative position of said primary control knob, and rotation limit structure connected with said primary control knob for selectively defining the rotation limits of said primary knob as desired by the lathe's operator, when said rotation limit structure is engaged said rotation limit structure being operable to allow rotation of said control knob between first and second operative positions and to deny rotation of said control knob between first and third operative positions, and when said rotation limit structure is dis-engaged said rotation limit structure being operable to allow rotation of said control knob between first and third operative positions.
2. An improved spindle control mechanism as set forth in claim 1, said rotation limit structure comprising a limit pin movable between operative and inoperative positions, said limit pin being carried by one of said primary control knobs and that part of said lathe to which said primary control knob is connected, and structure defining a limit slot in the other of said lathe part and said primary control knob, said limit pin cooperating with said limit slot to limit rotation of said control knob between first and second positions when said limit pin is operatively engaged with said limit slot.
3. An improved spindle control mechanism as set forth in claim 2, said rotation limit structure further comprising a spring loaded latch adapted to restrain said limit pin in at least one of said operative and inoperative positions.
4. An improved spindle control mechanism set forth in claim 1, said lathe having a transmission, and said connect-or means comprising a control shaft connected with the transmission of said lathe for controlling the rotation attitude of said spindle, a connector lever connected to said control shaft and a connector link pivotally connected to said connector lever at one end and pivotally connected to said primary control knob at the other end, said connector link's pivotal connection with said primary control knob being located at a position eccentric to the rotational axis of said primary control knob.
5. An improved spindle control mechanism as set forth in claim 1, said mechanism further comprising a temporary latch connected with said primary control knob for retaining said control knob in the operative position selected, said temporary latch comprising a spring loaded latch element mounted in one of said primary control knob and that part of said lathe to which said primary control knob is connected, and a plurality of position seats formed in the other of said lathe part and said primary control knob, said spring loaded latch element being seated in one of said position seat to locate said control knob in the desired operative position.
6. An improved spindle control mechanism as set forth in claim 1, said lathe having a spindle drive motor, and said mechanism further comprising a switch control drum fixed to said primary control knob, said control drum having forward, stop and reverse control fingers extending therefrom, and said control drum rotating in response to the rotation of said control knob, and a forward switch, a stop switch and a reverse switch electrically connected with the drive motor for said lathe's spindle, said forward and reverse switches activating said spindle drive motor when said primary control knob is in forward and reverse operative positions, and said stop switch deactivat-ing said drive motor when said primary control knob is in a stop operative position.
7. An improved spindle control mechanism for a lathe, said lathe having a headstock, a spindle, a drive motor and a transmission for said spindle, a tool carriage, and a tailstock, said mechanism comprising a manually rotatable primary control knob, and a manually rotatable secondary control knob, said primary knob being mounted on the headstock of said lathe and said secondary knob being mounted on the carriage of said lathe, a rotation limit structure connected with at least one of said primary or secondary control knobs for selectively defining the rotation limits of that knob as desired by the lathe's operator, whereby when said rotation limit structure is engaged said rotation limit structure is operable to allow rotation of said control knobs between first and second operative positions and to deny rotation of said control knobs between first and third operative positions, and when said rotation structure is disengaged said rotation limit structure is operable to allow rotation of said control knobs between first and third operative positions, a control shaft connected with the transmission of said lathe for controlling the rotation attitude of said spindle, said control shaft extending from the headstock end to the tailstock end of said lathe, a primary connector lever connected to said control shaft, and a primary connector link pivotally connected to said connector lever at one end and pivotally connected to said primary control knob at the other end, said primary connector link's pivotal connection with said primary control knob being located at a position eccentric to the rotational axis of said primary control knob, a second connector lever connected to said control shaft, said secondary connector lever being connected in a fashion that permits longitudinal motion of said lever along said control shaft but prevents rotational motion of said lever relative to said control shaft, and a secondary link pivotally connected at one end to said secondary control knob and pivotally connected at the other end to said secondary connector lever, said secondary connector link's pivotal connection with said secondary control knob being located at a position eccentric to the rotational axis of said secondary control knob, a switch control drum connected to one of said primary and secondary control knobs, said control drum having forward, stop, and reverse fingers extending therefrom, and said control drum being rotated in response to rotation of either one of said primary and secondary control knobs through the mechanical linkage connector therebetween established by said control shaft, primary and second connector links and primary and secondary connector levers, and a forward switch, a stop switch and a reverse switch electrically connected with a drive motor for said lathe's spindle, said forward and reverse switches activating said spindle drive motor when said control knobs are in forward and reverse operative positions, and said stop switch deactivating said drive motor when said control knobs are in a stop position.
8. An improved spindle control mechanism as set forth in claim 7 said primary control knob being rotationally mounted to said lathe's headstock, and said secondary control knob being rotationally mounted to said lathe's carriage.
9. An improved spindle control mechanism as set forth in claim 7, said mechanism further comprising a temporary latch connected with one of said control knobs for retaining said control knobs in the rotational position selected, said temporary latch comprising a spring loaded latch element mounted in said one of said control knobs and that part of said lathe to which said one control knob is connected, and a plurality of position seats formed in the other of said lathe part and said one control knob, said spring loaded latch element being seated in one of said position seats to locate said one control knob in the desired rotational position.
10. An improved spindle control mechanism as set forth in claim 7, said rotation limit structure comprising a limit pin movable between operative and inoperative positions, said limit pin being carried by one of said control knobs and that part of said lathe to which that control knob is connected, and structure defining a limit slot in the other of said lathe apart and that one said control knob, said limit pin cooperating with said limit slot to limit rotation of said control knob between first and second positions when said limit pin is operatively engaged with said limit slot.
11. An improved spindle control mechanism as set forth in claim 10, said rotation limit structure further comprising.
a spring loaded latch adapted to restrain said limit pin in at least one of said operative and inoperative positions.
a spring loaded latch adapted to restrain said limit pin in at least one of said operative and inoperative positions.
12. An improved spindle control mechanism for a spindle of a lathe, said mechanism comprising a manually rotatable primary control knob, said pri-mary control knob being connected to said lathe, connector linkage connecting said primary control knob to a control shaft, said control shaft, and thereby said control knob, being connected with said lathe's spindle for controlling the rotational direction of said spindle, and rotation limit structure connected with said primary control knob, said rotation limit structure being selectively operable to limit rotation of said control knob between first and second positions when said rotation limit structure is engaged, said rotation limit structure comprising a limit pin axially movable between operative and in-operative positions, and said limit pin being carried by one of said primary control knob and that part of said lathe to which said primary control knob is connected, and a structure defining a limit slot in the other of said lathe part and said primary control knob, said limit pin limit-ing rotation of said control knob between first and second positions defined by said limit slot when said limit pin is operatively engaged with said limit slot.
13. An improved spindle control mechanism as set forth in claim 12, including a spring loaded ball latch adapted to restrain said limit pin in said operative and inoperative positions.
14. An improved spindle control mechanism for a spindle of a lathe, said mechanism comprising a manually rotatable primary control knob, said primary control knob being connected to said lathe, switching apparatus directly connected to said primary control knob, said switching apparatus operating in response to the rotational position of said control knob for stopping and starting rotation of said lathe's spindle, and rotation limit structure connected with said primary control knob, said rotation limit structure being selective-ly operable to limit rotation of said control knob between first and second positions when said rotation limit structure is engaged, said rotation limit structure comprising a limit pin axially movable between operative and in-operative positions, and said limit pin being carried by one of said primary control knob and that part of said lathe to which said primary control knob is connected, and a structure defining a limit slot in the other of said lathe part and said primary control knob, said limit pin limiting rotation of said control knob between first and second positions defined by said limit slot when said limit pin is operatively engaged with said limit slot.
15. An improved spindle control mechanism as set forth in claim 14, including a spring loaded ball latch adapted to restrain said limit pin in said operative and inoperative positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA339,675A CA1128342A (en) | 1979-11-13 | 1979-11-13 | Spindle control mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA339,675A CA1128342A (en) | 1979-11-13 | 1979-11-13 | Spindle control mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128342A true CA1128342A (en) | 1982-07-27 |
Family
ID=4115596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA339,675A Expired CA1128342A (en) | 1979-11-13 | 1979-11-13 | Spindle control mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1128342A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103612152A (en) * | 2013-11-13 | 2014-03-05 | 安徽省海安机械制造股份有限公司 | Positive and reverse rotation adjusting mechanism for lathe spindles |
-
1979
- 1979-11-13 CA CA339,675A patent/CA1128342A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103612152A (en) * | 2013-11-13 | 2014-03-05 | 安徽省海安机械制造股份有限公司 | Positive and reverse rotation adjusting mechanism for lathe spindles |
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