US1945044A - Honing machine - Google Patents

Description

1934- A. M. JOHNSON ET AL HONING MACHINE Filed Aug; 29, 1929 6 Sheets-Sheet 1 ma m5 m9 Jan. 30, 1934. A. M. JOHNSON ET AL HONING MACHINE Filed Aug. 29, 1929 6 Sheets-Sheet 2 l'mzremifirs, flbbert JW. Jzhnw' HEM/ten" J1. Fa/i/rba/br Jan. 30, 1934.

A. M. JOHNSON ET AL HONING MACHINE Filed Aug. 29, 1929 6 Sheets-Sheet 3 1934- A. M. JOHNSON ET AL HONING MACHINE Filed Aug. 29, 1929 6 Sheets-Sheet 4 l l 1 I Til 412 w as #3 w 6 w 3% 4UT Mm MM. 5 .T/ an m w l a 1 5 1 w. m,

Jan. 30, 1934- A. M. JOHNSON El AL HONING MACHINE 6 Sheets-Sheet 5 Filed Aug. 29, 1929 15001221 J7. Fajzyrbwz m 1934- A. M. JOHNSON ET AL HONING MACHINE Filed Aug. 29, 1929 6 Sheets-Sheet 6 Patented Jan. 30, 1934 UNITED STATES HONING MACHINE Albert M. Johnson and Walter'M. Fairbairn, Rockford, Ill., assignors to Barnes Drill 00., Rockford, Ill., a corporation of Illinois Application August 29, 1929. Serial No. 389,116

14 Claims.

The present invention relates to improvements in machines having a member adapted to make a plurality of recurrent movements in each complete cycle of operations, and has particular reference to a honing machine for,honing cylindrical surfaces, such as engine cylinders, bearing bushings, etc.

In honing machines, the tool must be reciprocated a substantial number of times in the bore of the work to carry out the honing operation.

The primary object of the present invention resides in the provision in a honing machine of a novel control means which after institution of the operation will cause the tool to travel from an inoperative position to an operative position, then to reciprocate a predetermined number of times in the operative position, then to return to the inoperative position, and finally to stop automatically in the inoperative position.

2 A further object resides in the provision of a new and improved control mechanism of the foregoing character which can be adjusted to regulate the length of reciprocation of the tool in its operative position, and to regulate the number of reciprocations before the tool is withdrawn from the work.

A more specific object resides in the provision of a novel control mechanism of the foregoing character which comprises a pair of spaced reversing abutments, and a trip mechanism automatically operable after a predetermined number of reciprocations of the tool to render one of the reversing abutments inoperable so as to cause the tool to move beyond its range of reciprocation to its inoperative position, arg also to effect a resetting for the next cycle of operations.

Other objects of the invention reside in the provision of a novel control mechanism for honing machines which renders the cycle of movement fully automatic, which is efiicient and expeditious in operation, and which is relatively simple, compact and inexpensive in construction.

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

In the accompanying drawings, Fig. 1 is a fragmentary front elevational view of a honing machine embodying the features of our invention.

Fig. 2 is a fragmentary side elevational view of the machine.

0 Fig. 3 is a plan view of the machine.

Fig. 4 is an enlargedside elevational view 01' the control mechanism. I

Fig. 5 is an enlarged plan View of the control mechanism.

Fig. 6 is an enlarged front elevational view of the control mechanism.

Fig. 7 is a fragmentary sectional view taken along line 77 of Fig. 6.

Fig. 8 is a fragmentary sectional view taken along line 8-8 of Fig. 7. h

Fig. 9 is a fragmentary sectional View taken along line 9-9 of Fig. 6.

Fig. 10 is a fragmentary sectional view taken along line 10-10 of Fig. 2.

Fig. 11 is a side elevational view of the levers shown in Fig. 10.

While the 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 in tend to limit the invention to the specific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

The control mechanism may be incorporated in various types of honing machines. In each instance, the mechanism is adapted to be actuated by the main reciprocable member, usually the tool carriage, of the machine, and to act on a valve element or clutch element, depending on whether the machine is driven by hydraulic or mechanical power, controlling the drive for the member. For purposes of illustration, the control mechanism is shown in connection with an hydraulically operated honing machine of the character disclosed in Patent No. 1,783,019 issued November 25, 1930,-to Albert M. Johnson Referring more specifically to the drawings, the machine (see Figs. 1 to 3) comprises an upright column 10 having a pair of vertical slideways 11 on which a suitable work supporting table (not shown) is adjustably mounted. Positioned on the upper end of the column 10 is a main housing 12 having a pair of upright auxiliary housings 13 and 14 extending frontwardly therefrom in parallel spaced relation, the lower ends of which are located above the work.

The auxiliary housings 13 and 14 each support avertically positioned spindle driving shaft 15. The spindle shafts and their associated parts being similarly constructed, will be described as to one only, and similar reference numerals applied to both. The shaft 15 is preferably pro- 105 vided with a thrust collar 16 (see Fig. 2) intermediately positioned on the shaft in secured relation thereto, and bearing on its under side upon a conventional anti-friction bearing 1'! which is secured in the upper end of a guide sleeve 18. The latter extends through the lower end of the auxiliary housing 13, and preferably is provided with spaced bearings therein as illustrated at 19 and 20, the spindle driving shaft 15 extending outwardly from the lower end of the guide sleeve 18.

The upper end of the spindle driving shaft 15 is preferably splined, and extends upwardly of the upper wall of the housing 13. Within the housing and in longitudinally slidable relation to the splined portion of the shaft, there is operatively mounted on the shaft a gear sleeve 21 having rotatable support in conventional anti-friction bearings 22 and 23 supported in the housing. Secured to the sleeve 21 is a spur gear 24 having driven engagement with a gear 25 mounted on the stub shaft 26 operatively supported in the housing, preferably in spaced anti-friction bearings 27 and 28 suitably secured in a stationary bearing hub 29.

The lower end of the stub shaft 26 carries in secured relation thereto a bevel gear 30 having driven engagement with a pinion 31 carried upon the shaft 32, the latter extending horizontally through the two housings 13 and 14 and having similar driving connections with both mecha nisms for rotating the respective spindle driving shafts. The horizontal shaft 32 has suitable bearings provided in the side walls of the auxiliary housings 13 and 14 as indicated at 33 and 34.

Secured to the shaft 32 is a gear 35 having driven engagement with a gear 36 (see Figs. 2 and 3) securely mounted on the jack shaft 37 supported in bearings suitably positioned in the side walls of the main housing. The jack shaft 37 also carries, in fixed relation to the gear 36, a brake drum 38 with which is associated the braking mechanism.

The gear 36 is in .driven engagement with a pinion 39 loosely mounted upon the main drive shaft 40, the latter having suitable bearings in the side walls of the housing 12 and extending outwardly thereof at both ends, one end of the shaft 40 being preferably connected through a universal coupling 41 with the driving shaft of a motor 42 preferably mounted upon a suitable bracket 43 supported upon a wall of the hous-' ing 12. n

Within the housing 12', the main drive shaft 40 carries a conventional clutch device of which one element 44 is rigid with the pinion 39 and loosely rotatable upon the shaft 40, and the other element 45 is non-rotatably slidable thereupon to actuate conventional clutch engaging fingers effecting the operative control of the clutch in a manner well known in such devices. The element 45 is rotatably splined to a yoke 46, which latter is secured upon the stub shaft 47 extending through the upper wall of the housing. The upper end of the stub shaft 47 carries a crank 48 rigid therewith, the outer end of which pivotally supports a connecting link 49, the other end of said link being pivoted to a crank 50 rigidly mounted on a controlling rod 51 rotatively supported at one side and upon the main housing.

Positioned below the lower ends of the auxiliary housings 13 and 14 is a reciprocatory head structure 52 endwardly supported in secured relation upon the two guide sleeves 18 and operative therewith in reciprocatory movement upon the axes of the guiding sleeves. The head 52 is constructed preferably in hollow formation having sectionally divided upper and lower walls.

The guiding sleeves 18 are secured to the upper wall of the head 52 as by bolts 53. The respective spindle driving shafts 15 extend into the adjacent ends of the head structure 52, being supported at their lower ends preferably in anti-friction bearings 54 secured in the lower ends of the guide sleeves 18.

The downwardly protruding ends of the driving shafts 15 each carry a toothed pinion 55 having operative engagement with a gear 56 opera tively mounted upon a stub shaft 57 having suitable bearings in the upper and lower wall structure of the head 52. The gear 56 is in fixed relation to a pinion 58 also mounted on the stubshaft 57 which latter is in driving engagement with a pair of gears 59 and 60, the latter being independent of each other and securely mounted upon the upper ends respectively of the spindle supporting socket members 61 and 62.

In the machine herein disclosed the head structure supports four tool operating spindles, two of which are /operatively connected to each of the spindle driving shafts 15 as next above described. It will be obvious that more spindles may be added and simultaneously operated from the head 52 by including more of the spindle supporting sockets with similar driving gears on their upper ends, and with interengaging gears similar to the gear 59 for extending the train to any number of spindles desirable.

The reciprocatory movement of the head 52 is accomplished by means of a hydraulically actuated piston 63 operable in the cylinder 64 and having a connecting rod 65 extending through the lower end of the cylinder for operative attachment to the head 52, the connecting rod being preferably screw threaded at its connecting end for engagement in a lug 66 on the reciprocating head.

The cylinder 64 is positioned between the two housings l3 and 14 which enclose the guide sleeves 18, the ends of the cylinder being supported in an upper bracket 67 and a lower bracket 68 mounted between the spaced inner walls of the housings. The connecting rod 65 preferably extends through the upper end of the cylinder to equalize the area above and below the piston and maintain uniform speed thereof, the two ends of the connecting rod having conventional pack bearings in the ends of the cylinder as indicated at 68 The central attachment of the connecting rod 65 with the head structure 52 eifects the application of power for the reciprocation of the latter at a point which balances the head structure in its reciprocating movement and minimizes the possibility of side sway or twisting, and assures even wear upon the guide sleeves 18. 136 This arrangement increases the accuracy of movement of the honing tools.

The upper and lower ends of the cylinder 64 are provided respectively with ports 69 and 70 opening through the brackets 67 and 68 into com- 135 munication with the interior of the cylinder. The ports 69 and 70 are respectively in communication through suitable piping (not shown) with a pressure fluid circulating or hydraulic system for actuating continuously reciprocatory mecha- 14d nisms, which is well known in the art and does not form a part of the present invention, but which is partially disclosed herein, and for clarity is described as to its principal elements which are designed to operate with oil. The pipe con- 145 nections with the ports 69 and 70 lead to a main control valve 71 and are indicated at 72 and 73. The valve 7 1 is suitably connected with the pressure side and the suction side of a suitable oil pump, the latter being generally indicated at 74 156 and being mounted upon the bracket supported on the side wall of the housing 12. The control valve 71 operates to direct pressure fiuid alternately into the connections 72 and '73 with the cylinder ports to cause continuous reciprocation of the piston 63, and its operation is effected by the longitudinal movement therein of a piston (not shown) which is in turn controlled by a pilot valve 76, suitably interconnected therewith and also connected with the pump. Preferably, the valves 71. and 76 are formed in an integral structure mounted on the bracket 75. The pilot valve 76 is controlled by means of a piste-.1 rod 77 which is operatively connected to the control mechanism to be hereinafter described.

Mounted laterally on the reciprocating head 52, is a control bar 78 extending parallel to the axis of movement of the reciprocating head and having a sliding bearing support at its upper end in a bracket 79 mounted on the housing 12. To secure the bar 78 to the head 52, the lower end is journaled in a bearing 80 formed on the free end of a bracket arm 81 projecting laterally from the head, and is held against relative endwise movement by a bracket 82 and a stop collar 83 secured thereto and engaging the upper and lower ends of the bearing. Spring-pressed plungers 84 mounted in tubular guides 85 on the bracket 81 engage the bracket 82 at opposite sides of the bar 78 to hold the latter yieldingly in a predetermined angular position. The extreme lower end of the bar 78 is provided with a hand lever 86 whereby the bar may be rotated at will against the action of the plungers 84.

Slidably adjustable on the bar 78 in vertically spaced relation are an upper reversing disk 87, a lower reversing disk 88, and an intermediate reversing member 89 adapted to supplant the disk 88 during the period of reciprocation of the head 52 in operative position. To provide means for clamping these parts securely in adjusted position, and also to maintain the part 89 accurately in predetermined angular relation to the bar, the latter is formed with a longitudinal flattened surface 90 on the side adjacent the column 10, and suitable clamp screws 91 threaded into the parts are adapted to be turned into engagement with this surface.

The member 89 preferably is in the form of a block. Pivotally mounted thereon is a suitable pawl lever 92 which comprises a bifurcated body embracing the block 89. T e free ends of the bifurcated arms of the lever 92 are secured on a pivot pin 93 extending throu the block and the crotch of the lever extends over the upper end of the block for pivotal movement into and out of engagement therewith. Of the pawl lever, the rear arm is formed with an extension constituting a cam arm 94 having an inclined cam face 95 on its end, and the front arm is formed with a lateral lug 96 having a recess 97 in its upper face. A coilcompression spring 98 seated at one end in the recess 97 and abutting at its other end against a fixed lug 99 on the block 89, tends to hold the crotch of the pawl lever against the upper end of the block. Suitably secured in the crotch of the pawl lever 92 and extending outwardly therefrom is a hardened pawl 100 having an upper contact surface 101 and an upwardly and outwardly inclined end ogiitact surface 102.

The disks 87 and 88 and) the pawl 100 are adapted to control the pilot 76 through a mechanism now to be described. Bolted to the left side of the head casing 12 is a bracket 103 which is formed along its forward edge with an outwardly and forwardly inclined vertical web 104, and along its bottom edge with a laterally projecting horizontal mounting plate 105. The rear of the web 104 is formed with horizontal parallel ribs 106 and 107 provided respectively with two vertically alined apertures 108. Formed on the free end of the web 104 is a vertical guide housing 109 open at the top and bottom, and closed at the outer side by a removable cover plate 110. The integral side wall of the housing 109 is formed with a vertical slot 111. Slidably disposed for vertical reciprocation in the guide housing 109 is a cam plate 112 carrying an index pin 113 which projects outwardly through the slot 111 into the path of the abutments 87, 88 and 89. The cam plate 112 is formed in its outer face with a cam groove 114 which comprises two laterally offset vertical end sections 115 and 116 connected by an inclined intermediate section 117. The cover plate 110 is formed with a horizontal guideway 118 open to the cam plate 112. Slidably disposed in the guideway 118 is a cam bar 119 which carries a cam roller 120 disposed in the cam groove 114.

The outer end of the cam bar 119 is formed with a notch or recess 121 which engages the free end of one arm of a bell-crank lever 122 pivotally mounted between the ribs 106 and 107 on a pin 123 extending through the apertures 108. The other arm of the lever 122 is connected to a link 124 to the piston rod 77 of the pilot valve 76. It will be evident that upon downward movement of the bar 78 with the head 52 into operative position, the pawl 100 of pawl lever 92 will pass over the pin 113 to locate the latter between the upper abutment 87 and the pawl, and that thereafter the pin will be alternately raised and lowered to effect a timed reversal of the pilot valve 76 to reciprocate the head in its operative position.

Means is provided for automatically limiting the number of reciprocations of the head 52 in operative position, and for causing removal of the head to its inoperative position. To this end, the cover plate 110 is formed with a downward plate 125. Secured to a stub shaft 126 journaled in the plate 125, and disposed flatly against the plate is a suitable ratchet 127. The ratchet teeth face in a clockwise direction as viewed from the head casing 12. The ratchet 127 is formed in its exposed side with an annular concentric T-slot 128 (Fig. 9) in which a clamp bolt 129 is slidably disposed. A radial trip ar rn 130 is loosely mounted on the stub shaft 126, and extends therefrom across. the exposed side of the ratchet 127 and beyond the periphery thereof. The trip arm 130 is adapted to be secured in any desired position of adjustment for movement with the ratchet 127 by tightening the clamp bolt 129.

The inner face of the ratchet 127 is formed with an annular peripheral wall 131 defining a central recess 132 (Fig. 7). A coil clock spring 133 is disposed in the recess 132 about the stub shaft 126, and is anchored at its ends respective ly to a stud 134 on the mounting plate shaft 126 and a stud 135 on the inner periphery of the wall 131. The spring 133 tends to rotate the ratchet 127 in a clockwise direction as viewed y 120 and rearward extension constituting a mounting plate 125 and projects into the path of l the abument 136. The position occupied by the ratchet 127 when the abutments 136 and 137 are in engagement is designated for convenience as the initial or starting position.

To rotate the ratchet 127 in a stepby-step movement, on ce for each complete reciprocation of the spindle head 52, a ratchet pawl 138 (Fig. 7) is pivotally mounted on the lower end of the cam plate 112, and has a tooth 139 adapted to engage the ratchet teeth 140. A coil spring 141 anchored in the cam plate 112 abuts against a heel 142 on the pivoted end of the pawl 138, and thereby tends to urge the pawl yieldingly into engagement with the ratchet 127. The free end of the pawl 1381s formed with a beveled cam surface 143 adapted to engage a stud 144 to disengage the pawl from the ratchet 127 at the end of each stroke when the latter has been indexed one tooth. The stud 144 is adjustably mounted in a vertical slot 145 formed in the cover plate 110. x

A retaining pawl 146 is pivotally mounted on the plate 125 for engagement with the ratchet 127, and serves to prevent rotation of the latter under the-infiuence of the spring 133 when the pawl 138 is disengaged.

Suitable means is provided for bringing the lock pawl 146 into engagement with the ratchet 127 when ihe head 52 is moved into its operative position of reciprocation, and for lifting the pawl 146 when the head is returned to its remote inoperative position. Preferably, this means comprises a vertical link 147 connecting the free end of the pawl 146 to the free end of a crank arm 148 on a horizontal rock shaft 149. This shaft is journaled in spaced bearings 150 on a bracket 151 mounted on the housing 109. Secured to the rock shaft 149 between the bearings 150, and projecting into the path of the pawl 100, is a lift arm 152 (Fig. 6) the free end of which is bifurcated, i. e., formed with a notch 153. On the downward movement of the head 52'into operative position, the pawl 100 engages the arm 152 to lower the pawl 146 into engagement with the ratchet 127. Upon movement of the head beyond its range of reciprocation in operative position, the pawl 100 engages the arm 152 to raise the pawl 146 out of engagement with the ratchet 127, thereby permitting the spring 133 o rotate the latter-into starting position preparatory to the next cycle of operations.

Suitable means is provided for automatically rendering the pawl 100 inoperative to reverse the f. movement of he-head 52 after a predetermined number of reciprocations so as to permit the head to move upwardly beyond the range of its reciprocation into inoperative position. In the present instance, this means comprises a horizontal pawl control lever 154 (Fig. 5) pivoted in'ermediate its ends at 155 on the mounting plate 105. One end of the lever 154. has a cam arm 156 movable into the path of the cam arm 94 on the pawl lever 92 and adapted upon engagement therewith to oscillate the pawl 100 upwardly, out of position to engage the index pin 113.

' The other end of he lever 154 has an arm 157 projecting into the path of the trip arm 130. It will be evident that the trip arm 130 will move into engagement with the arm 157 after a predetermined number of reciproca'ions of the head 52, the number depending upon the adjustment of the arm 130 relative to the ratchet 127, to move the arm 156 into the path of the arm 94.

175 and 176 (Fig. 1).

Suitable means is provided for automatically stopping the head 52 in its inoperative position. In the present instance, this means comprises a lateral arm 158 adjustably mounted on the head 52 (see Fig. 10). Interposed in the upward path of the free end of the arm 158 and adapted to be engaged thereby at the end of the final upward movement of the head 52 is an inclined cam plate 159 formed on the free end of 'a lever 160. The lever 160 is operatively connected through suitable mechanism to the piston rod 161 of a stop valve 162 built in the hydraulic system and adapted when closed to cut off the supply of pressure fluid to the control valve 71. To this end, the lever 160 is secured as by means of a clamp 163 for vertical adjustment on a vertical sleeve 164 rotatable on the lower end of the vertical shaft 51. Of the shaft 51, the upper end is journaled against endwise movement in a bearing bracket 166 on the side of the housing 12, and the lower end is journaled in a bearing bracket 167 on the side of the column 10.

Secured on the lower end of the shaft 51 is a sui able hand control lever 168. A lever 169 over lying the lever 168 also is secured to the lower end of the sleeve 164. These levers are adapted for independent movement or to be connected for joint movement. To this end, the free end of the lever 169 is formed with a fiat arcuate plate 170 having an aperture 171 therein and having an upstanding lug 172. A suitable handle 173 is secured to the lug 172 to facilitate manual manipulation. Secured to the lever 168 is a releasable spring-pressed detent 174 adapted to enter the aperture 171 to secure the levers for joint movement.

.R'igidly secured respectively to the upper end of the sleeve 164 and to the shaft 51 at a point slightly above the sleeve are two thrust collars A coil spring 177 on the shaft 51 is anchored a; its ends to these collars and serves to maintain the sleeve 164 yieldingly in its operative position. Rigidly secured to the shaft 51 is a crank arm 178, the free end of which is connected through a bar 179 to the valve stem 161 of the stop valve. When the head 52 has reached ils inoperative position, the lever 160 is oscillated by the arm 158 to rotate the sleeve 164. The latter acting through the levers 168 and 169 serves to rotate the shaft 51, thereby closing the stop valve 162. Ro'ation of the shaft 51 to close the valve 162 also serves to open the clutch 4445 in the drive for rotating the spindles 15.

The general operation will now be briefly reviewed. Assuming the machine to be at rest, the detent 174 is released, and the lever 168 is actuated independently of the lever 169 to close the clutch 44-45 and to open the stop valve 162. Initially, the sleeve 164 is held against rotation by the arm 158. Downward movement of the head 52, with the spindles 15 rotating, is now initiated. As the head 52 moves downwardly, the cam plate 159 follows the arm 158, thereby permitting the sleeve 164 to rotate until the detent 174 snaps into the aperture 171, thereby connecting the levers 168 and 169 as a preparatory step to the stopping of the machine.

When the head 52 moves into its operative position the pawl 100 first engages the arm 152 to lower the pawl 146 into engagement with the ratchet 127, and then snaps over the index pin 113 to locate the latter between itself and the disk 87. At the end of the downward movement, the disk 87 actuates the pin 113 to reverse the pilot valve 76 and to index the ratchet 127 through one tooth. The head 52 now moves upwardly until the pawl 10,0 strikes the pin 113 to reverse the pilot valve 76. Thus, the head 52 is reciprocated in its operative position, and the ratchet 127 is indexed once for each complete cycle of reciprocation. The reciprocation may be interrupted manually by rotating the bar 78 to move the pawl 100 out of position to engage the pin 113. If this is done, the head 52 is returned to inoperative position and stopped automatically as hereinafter described. Upon releasing the manual grip on the bar 78, the latter again returns to its normal position.

After a predetermined number of reciprocations, determined by the setting of the arm 130, the latter moves into engagement with the arm 157 to move the cam arm 156 into the path of the arm 94. When the pawl 100 is about to engage the pin 113, the face 95 engages the arm 156, thereby raising the pawl to permit movement past the pin. The head 52 now is returned to its inoperative position. On its continued upward movement, the pawl 100 engages the arm 152 to release the ratchet 127, the latter returning to its initial position preparatory for the next cycle of operations.

At the end of the return movement, the arm 158 engages the cam plate 159 to close the stop valve 162 and to open the clutch 44-45. Simultaneously, the disk 88 engages the pin 113 to reverse the pilot valve 76 preparatory to effect the approaching movement of the next cycle of operations. It is to be understood that while the invention has been described in connection with a vertical machine, it is adapted for various types of machines.

We claim as our invention:

1. A honing machine comprising,in combination, a support, a movable member reciprocable on said support, means for reciprocating said member, said means including a stop element, a rock shaft for actuating said element, a concentric rock shaft, releasable detent means for connecting said shafts for joint rotary movement, torsional spring means connecting said shafts and resisting relative rotary displacement thereof, a cam lever on said last mentioned shaft, and means on said member movable into engagement with said cam lever at one end of the reciprocation to rotate said shafts to actuate said stop element.

2. A honing machine comprising, in combination, a support, a member reciprocable on said support, means for reciprocating said member, stop means for said last mentioned means, said stop means including a reversible control element, a stop dog actuated by said member, a rotary shaft operatively connected to said, element, a sleeve on said shaft, a handle on said shaft, a handle on said sleeve, a releasable spring detent on one of said handles, a plate on the other of said handles, said plate overlying said detent and having a recess adapted to receive said detent, a coil spring on said shaft and anchored at opposite ends to said shaft and said sleeve, and a laterally extending lever on said sleeve, the free end of said lever having an inclined cam member disposed in the path of said dog and adapted to be actuated thereby at one end of said reciprocation to actuate said stop means.

3. A honing machine comprising, in combination, asupport, a member reciprocable on said support, means for reciprocating said member, stop means for said last mentioned means, said stop means including a control element, a stop dog actuated by said member, a rotary shaft operatively connected to said element, a concentric shaft, a releasable spring detent on one of said shafts, a plate on the other of said shafts, said plate overlying said detent and having a recess adapted to receive said detent, a coil spring anchored at opposite ends to said shafts, and a laterally extending arm on said concentric shaft, the free end of said arm being disposed in the path of said dog and adapted to be actuated thereby at one end of said reciprocation to actuate said stop means.

4. In a honing machine, in combination, a support, a member slidable on said support, hydraulic means including a reversing valve for reciprocating said member, a reciprocable element operatively connected to said valve, two spaced abutments movable in the operation of said member for engagement with said element, one of said abutments having a stop movable into and out of position to engage said element, a ratchet, spring means tending to rotate said ratchet in one direction, stop means for limiting the rotation of said ratchet under the influence of said spring, a pawl operable by said element to index said ratchet once for each reciprocation against the action of said spring, a lift pawl for holding said ratchet in indexed position, a trip arm movable with said ratchet and adjustable thereon relative to said stop means, and a cam lever interposed in the path of said trip arm and movable upon engagement with the latter into position to engage said stop thereby to move same out of position to engage said element.

5. In a honing machine in combination, a support, a member slidable on said support, means including a reversing device for reciprocating said member, a reciprocable element operatively connected to said device, two spaced abutments move able by said member for engagement with said element, one of said abutments having a stop movable into and out of position to engage said element, a ratchet, spring means tending to rotate said ratchet in one direction, stop means 120 for limiting the rotation of said ratchet under the influence of said spring, means operable by said element to index said ratchet once for each reciprocation against the action of said spring, releasable means for holding said ratchet in indexed position, a trip arm movable with said ratchet, and a lever interposed in the path of said trip arm and movable upon engagement with the latter into position to move said stop out of position to engage said element.

6. In a honing machine in combination, a support, a member slidable on said support, means including a reversing device for reciprocating said member, a reciprocable element operatively connected to said device, two spaced abutments mov- 135 able with said member for engagement with said element, one of said abutments having a stop movable into and out of position to engage said element, a ratchet, means operable by said element to index said ratchet in timed relation to 140 the reciprocation of said member, a trip member movable with. said ratchet, and a member interposed in the path of said trip member and movable upon engagement with the latter to render said stop ineffective.

'7. In a honing machine, in combination, a support, a member movable in reversible directions on said support, a bracket on said support, a cam slide on said bracket movable in the samefdirections as said member and having a part posi- 150 tioned for actuation by said member alternately in opposite directions, said slide being formed with a cam surface, a second slide on said bracket having a part coacting with said cam surface, a bell-crank lever pivotally mounted on said bracket, one arm of said lever coacting with said second slide, and means for driving said member, said means including a reversible control element operatively connected to the other arm of said lever.

8. A honing machine comprising, in combination, a support, a movable member reciprocable on said support, means for reciprocating said member, said means including a stop element, a rock shaft for actuating said element, a concentric rock shaft, releasable detent means for connecting said shafts for joint rotary movement, a cam lever on said last mentioned shaft, and means on said member movable into engagement with said cam lever at one end of the reciprocation to rotate said shafts to actuate said stop element.

9. In a honing machine, the combination of a tool support and a work support arranged for relative reciprocation; an hydraulic actuating, means for one of said supports having a stop valve; a main control mechanism having a movable control element and a pilot valve adapted to govern said actuating means, first to cause a tool on the tool support to be associated with a piece of work on the work support, and then to effect a plurality of working reciprocations between the work and the tool; an auxiliary control device responsive to a predetermined number of working reciprocations to actuate said movable control element to effect the disassociation of the work and the toolby said actuating means; and means operable by the movable support as an incident to each disassociation of the tool and the work to operate said stop valve whereby to interrupt said actuating means.

10. In a honing machine, the combination of a tool support and a work support arranged for relative reciprocation; actuating means for one v of said supports; a main control mechanism for governing said actuating means, first to cause a tool on the tool support to be associated with a piece of work on the work support, and then to effect a plurality of working reciprocations between the work and tool, said main control mechanism including a member reciprocable as an incident to the reciprocatory movement of the movable support, a reversing control element, and cam means operable in the movement of said member to actuate said reversing element; an auxiliary control device operable upon the completion of a predetermined number of working reciprocations to govern said main control mechanism so as to effect the disassociation of the tool and the work by said actuating means; and means operable by the movable support as an incident to each disassociation of the tool and work to stop the movable support.

11. In a honing machine, the combination of a tool support and a work support arranged for relative reciprocation; hydraulic actuating means for one of said supports; a main control mechanism for governing said actuating means, first to cause a tool onv the tool support to be associated with a piece of work on the work support, and then to effect a plurality of working reciprocations between the work and tool, said main control mechanism including a member reciprocable as an incident to the reciprocatory movement of the movable support, a pilot valve for the actuating means, and cam means operable in the movements of said member to actuate said pilot valve; an auxiliary control device operable upon the completion of a predetermined'number of working reciprocations to govern said control mechanism so as to effect the disassociation of the tool and the work by said actuating means;

and means including a main stop valve for the hydraulic actuating means operable by the movable support as an incident to each disassociation of the tool and work to stop the movable support.

12. A honing machine having, in combination, a work support; a tool spindle mounted for reciprocation toward and from the work support; drive means for rotating the spindle; actuating means for reciprocating the spindle; a main control mechanism for governing said actuating means, first to move a tool on the spindle into operative relation to a piece of work on the support, and then to reciprocate the spindle repeatedly through a reduced range of movement, said main control mechanism including a movable control element responsive to the movements of the tool spindle; an auxiliary control device responsive to the number of working reciprocations of saidspindle and adapted to actuate said element so as to move said spindle toward its initial position and thereby withdraw the tool from the work, and means operable as an incident to each withdrawal movement of the spindle to stop both the actuating means and the spindle drive means.

13. In a machine of the character set forth having a rotary tool and a piece of work arranged for relative reciprocation, hydraulic actuating means including a stop valve, a main control mechanism initially operative to associate the tool and the work, and then to effect a plurality of working reciprocations between the tool and work, an auxiliary control device including a rotary element advanced in a step-by-step motion in response to successive working reciprocations andoperable at the end of a predetermined number of such working reciprocations to actuate said main control mechanism whereby to disassociate the tool and the work, means operable as an incident to each disassociation of the tool from the work to actuate said stop valve, and other means also operable upon such disassociation of the work and tool to actuate said rotary element so as to restore it to its initial position.

14. A honing machine having, in combination, a Work support; a tool spindle mounted for reciprocation toward and from the work support; drive means for rotating the spindle; actuating means for reciprocating the spindle; a main control mechanism for governing said actuating means,

first. to move a tool on the spindle into operative relation to a piece of work on the support, and then to reciprocate the spindle repeatedly through a reduced range of movement, said main control mechanism including a movable control element responsive to the movements of the tool spindle;

an auxiliary control device responsive to the number of working reciprocations of saicfspindle and adapted to actuate said element so as to move said spindle toward its initial position and thereby withdraw the tool .from the work, and

means operable as an incident to each withdrawal movement of the spindle to stop said actuating means.

ALBERT M. JOHNSON. WALTER M. FAIRBAIRN.

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