US1778675A - Headstock - Google Patents

Description

Oct. 14, 1930. H. E. KEMPTON ET AL 1,778,675

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HEADsTcK Original Fi1 ed Oct. 9, 1924 3 Sheets-Sheet 2 Oct. 14, 1930. H. E. KEMPToN ET Al.

HEADSTOCK Original Filed Oct. 9, 1924 3 Sheets-Sheet 3 Patented Oct. 14, 1930 UNITED STATES PATENT OFFICE HERBERT E. KEMPTON, 0F CHICAGO, ILLINOIS, AND KEITH F. GALLIMORE, 0F FOND DU LAC, WISCONSIN, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE HEALD MACHINE COMPANY, WORCESTER, MASSACHUSETTS, A C'OlPORALION OF MASSACHUSETTS HEADSTOCK Application led October 9, 1924, Serial No. 742,509. Renewed May 23, 1929.

AThe invention relates to machine tools, such as the grinding machine disclosed in a copending application, Serial No. 620,604, liled Feb. 23, 1923, by us and Prentice (jonradson, and has particular reference to improvements in spindle carriages.

rotation of the spindle.

Another Objectis to provide novel and improved means whereby when the clutch is disengaged from the spindle, thegage member will be withdrawn from the work and held positively in inoperative position.

A further object is to provide a spindle carriage. having novel and improved means for actuating the draw bar forv the work chuck.

Another object is to provide new and improved means for interlocking the draw bar and the clutch and gage member to prevent rotation of the spindle and forward Inovement of the gage member whenthe dran7 bar is withdrawn to release the work, thereby permitting reloading of the chuck without endangering the operator.-I

A reciprocating gage of the type described in the aforementioned application of Conradson and ourselves is subjected to repeated shocks as it strikes the workpiece, which causes the' gage to wear rapidly and require frequent inspection. An important object of the invention resides in the provision of means, `preferably a cylinder and piston, for controlling the' movement of the gage.

Ancillary objects and advantages will become apparent as the description proceeds.

InV the'drawings, Figure 1 is a vertical section taken along line 1 1 of Fig. 2 of a spindle carriage embodying the features ofv our invention.

Fig. 2 is a sectional view taken along line 2 2 of Fig. 1.

Fig. 3 is a horizontal section taken along line 3-3 of Fig. 1.

Fig. 4 is a fragmentary view looking down on the clutch and gage operating means.

Fig. 5 is a detailed view partially in section of the dash pot for the gage member.

WVhile our invention is susceptible of various modifications and alternative constructions, -we have shown in the drawings and will herein describe in detail the preferred embodiment, but it is to be understood that we do not thereby intend to limit the invention to the particular form disclosed but aim in the appended claims to cover all modifications anol alternative constructions falling within the spirit and scope of the invention.

Referring to the exemplary embodiment of the invention, 10 represents the base of the machine having ways 11 on which the spindle carriage is adjustably mounted. The carriage comprises a rectangular base section 12 having guides 13 -engaging the ways 11 and held against upward displacement by gibs 14, and a main bodysection 15 which extends through a central opening in the base section and is rotatably adjustable on a vertical axis. A plurality of bolts 16 the heads of which engage in an annular l`slot 17 in the-base section 12 are provided to lock the' body section 15 in place. The carriage as a whole is arranged to be fed along the ways l1 by means of a feed screw 18 which is rotatably but stationarily mounted on the base 10 and which passes through a feed nut 19 on the base section l2.

Rotatably mounted in the body section -15 transversely of the ways 11 is a hollow spindle 20 provided with a chuck 2l of suitable construction on its front end. In the prestending through the spindle 20. Preferably the chuck 21 is enclosed by a suitable hood 25. Coolant for the machine operation can be supplied to the chuck 21 through a pipe 26 which is provided with flexible leads 27 and is longitudinally and rotatably adjustble in a split sleeve bracket 28 on the hood The work A when centered in the chuck 21 is positioned to be engaged by an operating element which in the present instance is the grinding Wheel 29 on the reciprocatory carriage 30. It will be understood that in moving the carriage by the feed screw 18, the vork is pressed against the grinding wheel A suitable gage having coarse and fine feed gage members 31 and 32 is mounted to periodically engage the work, and upon entry or movement past the groundwork surface is adapted to control the movement of the grinding wheel 29 and the cross feed of the carriage in a manner not herein disclosed. The gage members are mounted in the chuck 21 on the front end of a gage rod 33 which extends longitudinally and centrally through the spindle 20 and which is spaced from the draw bar 24 by a pair of sleeves 34. EX- tending slidably through the body section 15 in parallel relation to the rod 33 and connected atits rear end to that of the latter by a bracket 35 is a push rod 36 which is provided with a roller abutment 37 adapted to be engaged by the carriage 30 to move the gage from the work as the grinding wheel 29 moves inwardly. Forward movement of the gage is induced by a coil spring 38 mounted on the rod 36 and abutting against`a collar 39 thereon. I

Loosely mounted on the spindle 20 to be driven from any suitable source is a drive member 40. The drive member is adapted to be engaged by a clutch 41 which is splined on the spindle 20, and which is adapted when in open position to frictionally engage a brake collar 42 formed on the body section 15. The construction thus far described is old and well known, and forms no part of the present invention it being disclosed merely for purposes of illustration.

Means is provided for operating the clutch 41. This means comprises a yoke 43 which is mounted to oscillate on a shaft 44 journaled in the body section 15 and which is provided with a pair of pivotal shoes 45 engaging in opposite sides of an annular groove 41a in the clutch 41. The yoke 43 is formed with a depending cam arm 46 to the front face of which a hardened steel shoe 47 is secured. A cam 48 mounted on a cam shaft 49 is positioned to engage the shoe 47 and thereby throw the clutch 41 out of engagement with the member 40 and into engagement with the brake collar 42 to stop the spindle 20. The cam shaft 49 is journaled in the side walls of the body section 15, and can be rotated in either direction by a hand lever'50 secured to its outer end. Spring means 51 tend to move the clutch 4l against the member 40. To ensure such movement, the yoke 43 is provided above the shaft 44 with a tubular projection 52 totheend of which a hardened steel plate 53 is secured. A cam 54 mounted on the shaft 49 is formed at its opposite sides with a pair of lobes 55 and 56 of which the lobe 55 is positioned to strike the plate 53 as the shaft 49 is rotated to release the arm 46.

Means is provided for automatically withdrawing the gage from the work when the clutch is released, to facilitate reloading of the chuck. Slidably mounted on the push rod 36 for movement against the collar 39 is a rectangular plate 57 which is adapted to be engaged by a cam 58 on the shaft 49 to move the gage rearwardly against the force of the spring 38. The cam 58 is arranged to engage the plate 57 just after the clutch 41 has been disengaged. To hold the gage in withdrawn position independently of the cam 58, a pawl 59 is pivotally mounted in a bracket 60 on the body section 15 to engage the upper front edge of the plate 57. This engagement will take place only when the clutch is thrown out, and will not occur during the normal reciprocation of the gage. The pawl 59 has an upward extension 61 which is adapted to be struck by the lobe 56 to release the plate 57 and'allow a return of the gage when the shaft 49 is rotated to throw 1n the clutch 441. It will be evident that moving the hand lever 50 to the right will throw out the clutch 41, withdraw the gage from the work, and operate the brake to stop the spindle, and that moving the lever to the left will release the brake and gage, and throw 1n the clutch to rotate the spindle.

Forward movement of the gage toward the work is damped by a suitable dash-pot to eliminate sharp hammer blows, and prevent wear and inaccurate gaging. The dash-pot comprises a piston 62 which is slidably mounted in a cylinder 63 in the front wall of the base section 15. The outer end of the cylinder is closed by a removable plug 64. On the intake stroke, air enters the cylinder 63 through a longitudinal central passage 65 and a ball valve 66 in the piston 62, and on the exhaust stroke is gradually forced out through a' passage 67 extending longitudinally in the piston 62 and opening through a A bleed vent 68. The free end of the piston 62 extends through and is secured to the plate 57 by a nut 69A Means is provided for operating the draw bar 24. This means comprises a vertical bracket which provides a recess 70a in which are lugs, not shown, carried by a member 7()b that has a threaded engagement with the rear end of the bar 24, and which is formed with a ring ange 71 telescoping with the rear end of the spindle. Rigidly secured at its rear end to the bracket is a shaft or rod 72 which is parallel to the draw bar 24 and extends slidablv through lugs 73 on the lower side of a cover 74 closing the top of the body section 15. The forward end of the rod 7 2 is connected with a lever 75 by a link 76 which With the latter constitutes a toggle for iperating the bar 24. The lever 7 5 is formed with a shaft extension 77 which is journaled in the cover 7 4 and to which a hand lever 78 is secured. vMovement of the lever 7 8 to the right will bend the toggle to close the chuck 21, and movement in the opposite direction will straighten the toggle to open the chuck. A stop 79 depending from the cover 74 serves to limit movement of the toggle joint to a position just over the dead center, thereby preventing the clamping members 22 from mov-- ing the draw bar 24 forwardly when in open position.

Means is provided for interlocking the draw bar mechanism and the cam shaft .49 to prevent the gage from being released and the clutch 41 from being thrown in when the chuck 21 is open.v This means comprises a lever 80 mounted on the shaft 49, and extending upwardly to either side of a pin 81 slidable laterallv thereof in a depending lug 82 on the cover 74. The pin 81 is connected through a link S3 to a short arm 84 integral with but opposite to the lever 7 5. Vhen the clutch 41 is disengaged and the chuck 21 is opened, the pin 81 Will be projected across the lever 80 to hold the latter in position and pre- `vent movement of the hand lever 50.

It will be seen that we have provided a spindle carriage having novel and improved means for actuating the clutch, the gage, and the chuck draw bar, and for interlocking them to ensure safety and eiciency in handling the machine. The parts are simple and sturdy in construction, and are .protected from wear and injury.

lVe claim as our invention:

1. A spindle carriage having, in combination, a rotatable spindle provided with a work holder, a clutch for said spindle, a gage member slidably mounted in the carriage for reciprocatory movement toward and from the work, and cam means for simultaneously operating said clutch and said gage.

2. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section and having a work holder, a clutch for said spindle, a gage mounted in said spindle for movement toward and from the work, a yoke engaging said clutch, a shaft mounted in said section, and means on said shaft for oscillating said lvoke and for moving said gage from the work.

3. 'A spindle carriage having. in combination, a body section, a spindle rotatably ymounted in said section and-having a work chuck on one end, a gage member slidably mounted for movement relative to the work, a clutch for said spindle, a single actuated means for operating said clutch and withdrawing said gage from the work, and means for damping the movement of said gage toward the work.

4. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section andhaving a work holder mounted on one end, a gage rod eX- tending slidably through said spindle and having a gage member on one end, a push rod parallel to said gage rod and rigidly connected thereto slidably mounted in said section, spring means for moving said push rod forward, a clutch for said spindle, a yoke engaging said clutch,` and single actuated means adaptedto sucessively engage said yoke and said push rod to throw out said clutch and withdraw said gage member from the work.

5. A spindle carriage having, in combination, a main section, a spindle rotatably mounted in said section and adapted to support a work holder, a gage member mounted for movement toward and from the work, a clutch for said spindle, cam means for operating said clutch, and means operable to move said gage member from the work when said clutch is disengaged.v

6. A spindle carriage having, in combination, a main section, a spindle rotatably mounted insaid section and adapted to support a work holder, a gage member mounted for movement toward and from the work, a clutch for said spindle, means for operating said clutch, means for, moving said gage member away from said work when said clutch is disengaged, means for holding said gage member in withdrawn position, andmeans for releasing said gage member when said clutch is thrown in.

7. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section and having a work chuck on one end, a gage member movable toward and from the work in said chuck, aV

clutch for said spindle, a cam shaft rotatably mounted in said section, and a plurality of cams on lsaid shaft for operating said clutch and for movingsaid gage member.

8. A spindle carriage having, in combination, a main section, a spindle rotatably mounted in said section and having a work chuck on one end, a clutch for'said spindle, a gage member mounted for movement toward and from the work, spring means for moving said gage member toward the work, catch means for holding said gage member away from the work, and cam means for operating lsaid clutch, moving said gage member against the force of said spring, and disengaging said catch means.

9. A spindle carriage having, in combination, a main section, a spindle rotatably mounted in said section and having a work chuck on one end, a gage rod carrying a gage member at its forward end for movement from and towardthe work, spring means for moving said gage member forward, means for moving said gage member from the work, a catch for holding said gage member in withdrawn position, means for releasing said catch, and a dash-pot for damping the movement of said gage member toward the work.

10. A spindle carriage having, in combination, a main section, a spindle rotatably mounted in said section and supporting a work chuck, a slidably mounted gage rod having a gage member adapted to periodically engage the work in said chuck, a push rod parallel to said gage rod and rigidly connected therewith slidably mounted in said section, a spring on said push rod tending to move said gage rod forwardly, a plate loosely mounted on said push rod, a cani shaft rotatably mounted in said section, a cam on said shaft mounted to engage said plate to move said push rod against the force of said spring, a catch adapted to engage said plate to hold said push rod in withdrawn position, and a cam on said shaft for disengaging said catch from said plate to release said push rod.

11. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section and supporting a work chuck, a gage member mounted in said section for movement toward and from the work in said chuck, means for actuating said member, and means for damping the movement of said member toward the work.

12. A spindle carriage having, in combination, a main section, a work spindle rotatably mounted in said section, a clutch on said spindle, a yoke engaging said clutch and having a depending arm, and manually operable cam means for engaging said arm to actuate said clutch. p

13. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section, a clutch for said spindle, a yoke engaging said clutch, and cam means mounted to engage said yoke selectively at opposite sides of its pivot to actuate the clutch respectively in opposite directions.

lll. A spindle carriage having, in combination, a main section, a spindle rotatably mounted in said section, a clutch splined on said spindle, a yoke engaging said clutch, said yoke having a depending arm on one side of its pivot and a projection on the other side of its pivot, a cam shaft rotatably mounted in said section, and cam means on said shaft for selectively engaging said arm and said projection to oscillate said yoke respectively in opposite directions. 4

15. A spindle carriage having, in combination, a main section, a spindle rotatably mounted in said section and having a chuck in one end, a chuck draw bar slidably mounted in said spindle, a second bar parallel to said draw bar and rigidly connected therewith slidably mounted in said section, a toggle mechanism for operating said second bar, and a stop for limiting the movement of said toggle mechanism in one direction to a point slightly past deadscenter so as to hold said draw bars in adjusted position.

16. A spindle carriage having, in eombi nation, a main section, a spindle rotatably mounted in said section and supporting a chuck, a clutch for said spindle, manual means for operating said clutch, a chuck draw bar slidably mounted in said spindle, manual means for operating said draw bar, and interlocking means operable through actuation of said draw bar operating` means for said clutch operating means and said draw bar operating means.

17. A'spindle carriage having, in combination, a main body section, a spindle rotatably mounted in said section and supporting a work chuck, a clutch for said spindle, means for operating said clutch, a gage. member mounted for movement toward and from the work, means for withdrawing said gage member when said chuck is being disengaged, a draw bar for said chuck, means for operating said draw bar, and interlocking means for preventing movement of said clutch and said gage member when said chuck is open.

18. A spindle carriage having, in combi nation, a body section, a spindle rotatably mounted in said section and supporting a work chuck, a clutch for said spindle, a work gaging member, an operating shaft, cam means on said shaft for actuating said clutch and for withdrawing said gaging member from the Work when said clutchis being disengaged, a draw bar for the chuck, means for operating said draw bar, and means for interlocking said draw bar and said operating shaft when the draw bar is in one position so as to prevent actuation of said operating shaft.

19. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section, a chuck on said spindle, a clutch for said spindle, an operating shaft, means including said operating shaft for actuating said clutch, a draw bar for said chuck, means for operating said draw bar, and two movable parts controlled by said operating shaft and said last mentioned. means adapted to interlock when said bar is in one position.

20. A spindle carriage having, in combination, a main body section, a spindle rotatably mounted in said section and supporting a work chuck, a clutch for said spindle, a gage member adapted to engage the work, means for interlocking said gage member and said clutch when said clutch is disengaged, a draw bar for said chuck, and means for interlocking said draw bar and said last mentioned means when said draw bar is in open position.

21. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section and supporting a chuck, a clutch for said spindle, a draw bar for said chuck, means for interlocking said clutch and said draw bar when said draw bar is in one position.

22. A spindle carriage having, in combination, a body section, a spindle rotatably mounted in said section and supporting a chuck, a clutch lfor said spindle, means including a shaft for operating said clutch, a lever on said shaft, a draw bar for said chuck, means including a shaft for operating said draw bar, and a lock pin operatively connected to last mentioned shaft adapted to be moved into interlocking position with said lever when said draw bar is in one position.

23. A spindle carriage having, in combination, a rotatable spindle provided with a work holder, a gage member mounted for movement toward and from the work, means for opening and closing said work holder, and means for locking said gage member l against movement when said work holder is piston to control the approach of the gage towards the chuck.

26. In apparatus of the class described, a c

chuck, a. gage, resilient means for urging said gage towards a workpiece in said chuck, means for periodically in oving said gage away from said chuck, and a cylinder and piston to control the movement of said gage.

27. In apparatus of the class described, a'

chuck, a gage, resilient means for urging said gage towards a workpiece in said chuck, a draw bar to operate the work-holding means in said chuck, means for holding said gage away from the work, and means for locking said last named means when said draw bar is moved to open said chuck.

In testimony whereof we have hereunto aiiixed our signatures.

HERBERT E. KEMPTON. VKEITH F. GALLIMORE.

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