US2255583A - Honing machine - Google Patents

Description

Sept. 9, 1941. c. o. HOLLAND HONINGI MACHINE 4 SheetsSheet l Filed April 15, 1959 JWA.

' cflTTomsy s 4 Sheets-Sheet 2 C. O. HOLLAND HONING MACHINE iled April 15, 1959 Sept. 9, 194-1,

Gyms/er O cl/and 37m, 625., p2,. 4244,41.

C. O. HOLLAND HONING MACHINE Sept. 9, 1941.

Filed April 15, 1959 4 Sheets-Sheet 4 NVELNTOQ //a pg d O TTOQEEyS Patented Sept. 9, 1941 UNITED STATE s PATENT OFFICE HONING MACHINE Chester 0. Holland, Rockford, 111., assignor tov Barnes Drill 00., Rockford, 111., a corporation of Illinois Application April 15, 1939, Serial No. 267,978

20 Claims.

The invention relates to machines for dressing cylindrical surfaces, and more particularly to honing machines.

The honing operation as performed by machines of the above general character involves the relative rotation .and simultaneous relative reciprocation of an expansible cylindrical abrasive tool or hone and the work piece. The tool andwork piece are accordingly carried on separate supports one of which is mounted for movement toward and from the other. Preferably, the range of movement of the reciprocatory support is substantially greater than the longest work piece tobe. operated on so that the tool and work may be dissociated by an amplified movement of the reciprocatory support to a retracted position, thereby facilitating the removal of the finished work piece. 3 7

At the beginning of the honing operation the tool and work piece are initially brought into operative association by an advancing movement I of the reciprocatory support and then the ab'rastruction and arrangement of the component parts of the machine.

Additional objects and advantages of the invention will become apparent from the following detailed description of the preferred embodiment illustrated in the accompanying drawings, in which: I

Figure 1 is. a'perspective view of a honing machine embodying the features of the invention.

Fig. 2 is a horizontal sectional view of the machine -taken substantially along the line 2-2 of I Fig. 1. K

sive elements of the tool are expanded into contact with the surface of the work. Upon such operative association, the support is reciprocated through a plurality of working strokes to traverse the tool from one end of the work piece to the other. When the work is finished to the desired dimension, the tool is contracted and the reciprocatory support is moved through an amplified stroke to dissociate the tool and the work, thus terminating an operating cycle of the machine.

The termination of the operating cycle is preferably controlled automatically.

One object of the'present invention is to provide an improved control m'echanism'for controlling the movements of the reciprocatory support'of a machine of the above general character.

Another object is to provide an improved control mechanism for controlling the reciprocation of the movable support and the expansion and contraction of the tool, which mechanism is readily adjustable to adapt the machine for operating on work pieces of different length and which has all of the adjusting instrumentalities grouped in an advantageous manner for convenient access.

Other objects reside in the provision of a vertical type machine which requires a minimum of headroom for its installation, which is compact and. of clean appearance, with the associated controldevices and other appurtenances enclosed within the frame or column, and which is efiicient, reliable and safe in operation, these objects being attained through the novel con- Fig. 3 is a diagrammatic view showing the, relationship of the hydraulic, electrical and mechanical operating and control elements of the machine.

Fig. 4 is a vertical sectional view of the mechanical portion of the reciprocation controlling mechanism.

Fig. 5 is a face view of the reciprocation con-- trolling mechanism shown in Fig. 4 as viewed from the side of the machine.

Fig. 6 is a fragmentary perspective view of the 4 reciprocation controlling mechanism showing details of the intermediate stop.

Fig. 7 is a. diagrammatic view showing the range of movement of the synchronously operrotated and reclprocated relative to a stationarily supported'work piece, it is to be understood that certain features of the invention may be incorporatedin other types of honing machines. It is also to be understood that various changes and modifications may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention as expressed in the appended claims.

Referring to Figs. 1 to 3 of the drawings, the

machine selected to illustrate the invention comprises generally a rectangular base 9 from which rises a hollow upright frame or column l0. Verticall disposed guide bars it supported in parallel spaced relation by bosses l2 projecting from the face of the column l0 constitute a guideway tical standards I! supported and guided for endwise sliding movement in vertical guide sleeves l1 rigidly secured'to the base. The table may be raised or lowered to accommodate work pieces of different length by means of an elevating screw l8 adapted to be operated through the medium of a hand crank it.

A workplace stationarily supported on the table I is adapted to'be operated on by a rotating and reciprocating honing tool 2! of conventional construction. Accordingly, the honing tool is carried onone end of a hollow spindle 22 which is Journaled at its other end on the head It. A suitable-guide 22. adiustably supported on'extensions li of the guide bars H which project below the bosses i2 defining the lower end guideway for the head it serves to guide the tool H in its movements into or out of a work piece.

A honing tool of the type illustrated in Fig. 1 is adapted to be expanded and contracted by endwise movement of a tool actuating rod 23 (Fig. 3) extending through the hollow spindle 22'and into the head i3. Such movements are imparted to the rod 23 by power actuated means hereinshown as comprising a piston 2d operating in a vertically disposed cylinder 26 mounted within the head IS in axial alinementwith the spindle. Pressure fluid is introduced into opposite ends of the cylinder 25 alternately through suitable ducts, such as the flexible tubes 23 and 24", to shift thepiston up or down in. the

- cylinder in proper timed relation to the operation of the other parts of the machine, as will be described hereinafter.

In order toeflect the relative rotation of the tool and work required for the performance of the honing .operation, suitable power driven means, such as a motor M, is provided for rotating the tool spindle 22. In a preferred form of the machine, the spindle driving motor M is mounted directlyon the head it, as shown in Figs. 1 and 3, and is drivingly connected withthe spindle by appropriate speed reduction gearing 28 enclosed within the'head. The incorporation of. the driving motor in the head in this manner materially simplifies the machine structure and in conjunction with other features of the machine to be described presently effects a material reduction in the over-all height of the machine.

As herein shown, the head II is mounted for reciprocation on the guide bars H by means of laterally projecting bearing brackets 21 (Figs. 1 and 2) apertured to receive bushings 28 of "Ollite" or other suitable bearing material arranged-to slide on the guide bars. Four such brackets are provided in the machine illustrated,

these being arranged in pairs on opposite sides of the head ll with the brackets of. each pair spaced apart a substantial distance longitudinally of the head so as to maintain the head in accurate alinenient with the guide bars. Where the range of travel or stroke of the head is relatively long, it may be necessary or desirable to support the guide bars II- at one or more points intermediate the bosses l2. .3 such in stances, the sliding bearings'llmay 'be'replaced by roller type bearings such as shown in the uniformity of the motion produced by such driving mechanism. The hydraulically actuated means in its preferred form, as shown in Figs. 1-3, comprises a cylinder 30 mounted in a vertical position inside or the column ill with its upper end located below the lower end of the guideway. A piston 3i working in the cylinder- 30 is connected by a rod32 with a bracket or arm 33 rigid with the head 93 and projecting rearwardly therefrom through a vertical slot at (Figs. 1 and 2) in the face of the guideway.

Movements of the piston in the cylinder are therefore eiiective to move the head back' and forth in the guideway, such movements being imparted to the piston by the introduction of pressure fluidinto opposite ends of the cylinder alternately.

The location of the cylinder 30 at the rear of the head and below the guideway for the same instead of above the head as has heretofore been the general practice is advantageous in reducing the over-all height of the machine. Due to this arrangement of the head reciprocating cylinder and to th mounting of the spindle drivingmotor M directly on the head, there are no'projecting. parts, such as cylinders, drive shafts, etc., above the top of the column it even when the head is in its uppermost position and the machine therefore requires a minimum of headroom for its installation.

Pressure fluid for reciprocating the head i3 and hydraulic circuit shown diagrammatically in Fig.

3 of the drawings. A reversing valve V-i controls the supply of pressure fluid to the head reciprocating cylinder 30 while a valve V2, also of the reversing type, controls the supply of pressure fluid to the tool actuating cylinder 25. The valve V--I as herein shown is adapted to be operated hydraulically to its two active positions under control of a pilot valve V-3 which, in turn. is operated in timed relation to the reciprocation of the tool head by novel reciprocation controlling mechanism CM, to be described presently. Valve V-2 is preferably spring-biased to the normal position shown in Fig. 3 and is adapted to be operated to reverse position by a solenoid SOL-4,

In order to enable the machine to operate eiiiciently and at a high productive capacity, it is equipped with a system of controls designed to reduce the work of the attendant to a minimum. This control systemcomprises interrelated electrical and mechanical control devices including the control mechanism CM, hereinbefore referred 'to. and operative in response to the momentary chine cycle may vary in different types of machines and for different. classes of work, the operating cycle of the exemplary machine begins with the starting of the spindle driving motor M and the pump driving motor M-l. These motors are started by a momentary closure'ol. the manually circuit for itself by closing switch R-ll andcloses a switch R-ll, to connect the motors M and M--l across the line L.

To maintain the relay RF-l energized and thus continue the operation of the motors M and M-l after the push button is released, the relay locking circuit is completed by a switch LS adapted to be closed by the control mechanism CM upon the movement of the head I! from its fully retracted position. The locking circuit as herein shown includes a momentarily closed inching" switch 8-2 and a normally closed "stop switch 3-3. The latter switch is available for stopping the machine in case of emergency as it serves to open the circuit of the relay Ra-l and thus effect opening of the motor switch R-l2. The switch 8-: is .utilized primarily in setting up the work when it is frequently necessary to operate the motors M and M-l for short periods without initiating a complete machine cycle. To this end,- the switch S--2 is arranged'when operated to close an' auxiliary energizing circuit for the relay R--,I and to open the locking circuit for the relay. Thus the relay R is energized andv current is supplied to the motors M and M-I only while the switch S-l is held in operated position.

of the pump P in the manner above described,

valve V3 initiates the operation of the reversing valve VJ so that'pressure fluid is directed to the upper end of the head reciprocating cylinder 30. At the same time, the lower end of the cylinder 30 is opened to a suitable drain so that the spent pressure fluid therein may be exhausted and returned to a sump or reservoir R from which the pump P draws the fluid for reuse. Piston 3| is accordingly shifted. toward the lower end of the cylinder, thereby moving the head l3. and tool 2| toward the work piece.

When the toolis brought into operative relation with the work, the control mechanism CM closes a normally open switch 18-! in a manner to be described presently, thereby completing acircuit for a relay R,2 which becomes energized and completes a locking circuit for itself by way of its switch R-2i and a normally closed switch R3l of a relay R-t. Relay R-2 also closes switches R22 and R23 to complete an energizing circuit for the solenoid SOL-4 which operates the valve V-Z to its reverse position and thereby directs pressure, fluid into the upper end of the cylinder 25. The piston 24 is shifted toward the lower end of the cylinder and through the medium of the rod 23 expands the abrasive elements of the tool 21 into contact with the surface of the work piece.

Downward movement of the head l3 continues until the tool reaches the lower end of the work piece, that is, the lower end of the working stroke, whereupon the pilot valve is operated to its alternate position by the control mechanism CM, re operating the valve V-l to its alternate position to direct pressure fluid into the lower end of the cylinder 30 and to connect the upper endof the cylinder to the drain. The direction of movement of the head is accordingly reversed and the tool is traversed upwardly tothe'upper end of the work piece.

Instead of permitting the head to move upwardly to fully retracted position, the control mechanism CM is so arranged that, upon the tool 2| reaching the upper end of its working stroke,

valve V---! is again'operated to reverse the direction of movement of the head. This cycle of operations continues with the head reversing at each end of the working stroke until the operation of the control mechanism is modifiedto initiate an amplified stroke of the head to-withdraw the tool from thework. I

The modification of the action of the control mechanism CM may be effected either manually or automatically, the latter being preferred as it relieves the attendant of the necessity of keeping a close watch on the operation of the machine. As herein shown, the automaticIoperation is effected under control of an auxiliary device suchas an electric timer TM arranged to be started in response to the closure of the switch L8. The timer TM which may beof any suitable and well known construction includes a normally open switch TS arranged to be closed after the lapse of a predetermined time which may be varied in accordance with the character of work to be performed. -Closure of the switch TS completes a circuit for the relay R-3 which opensv the switch R-3| to deenergize relay R-2 and simultaneously closes switches R-32 and R,--33 to complete an energizing circuit for-a solenoid SOL-2. Relay R-I becomes deener- ,gized and opens the circuit of the solenoid .operated to its reverse position until the head reaches 'the extreme upper limit of its stroke with the tool completely withdrawn from the work. As the head approaches the retracted position, thev valve V-8 is operated to the position shown in Fig. 3, thus preparing the machine for the next operating cycle. At the same time, the switch LS is opened to deenergize the relay R-I and thus stop'the motors M and Having in mind the various control functions to be performed in an operating cycle of the machine, the construction and operation of the control mechanism CM which constitutes an im-' portant part of the control system will now be described.

Referring to Figs. 4 to 8, the control mechanism in its preferred form comprises a pair of 00-1 operating control elements, and 42 mountedto rock about a common axis. The latter element is adapted to be rocked through an angle pro portionate to the distance moved by the tool 1 the control element 'u between twolimit positions to operate the pilot valve V-S, the control elements being provided with suitable adjustable stops, dogs, etc. for this purpose.

As herein shown, the control switches and pilot valve are mounted on a removable support- 1 ing frame 43 which is set in an aperture 44 in one side of the column l andbolted or other- 1 wise rigidly'securedto the wall of the column. The frame preferably comprises a casting having 3 integrally formed side walls 45 and an end wall 4! defining an outwardly opening compartment for p housing the control elements and associated control devices such as the switches LS and LS-l.

A cover plate 41 having an aperture or window 1 48 alined with the control elements is bolted to j the frontof the frame structure to partially 1 cover'the compartment. The control elements are thus disposed in a position in which/they are conveniently accessible and yet not likely to be damaged by men working around the machine. Moreover, the control mechanism and.

associated control devices are assembled in a l unitary structure which may be quickly and l j easily removed from the machine for repair or replacement by simply disengaging the support-' ing frame and withdrawing it from the column.

1 Referring now to Fig. ,4, the control element l 42 as herein shown is of generally cup-shaped form consisting of a bottom disk it encircled by an upstanding wall it whose marginal edge terminates in an enlarged inwardly projecting flange ii of generally rectangular cross section. The control element is mounted to rock about a horizontal axis through the medium of a rear.- wardly projecting cylindrical hub 52 rigid with the bottom of the element. As herein shown,

" the hub is joumaledin bearings I3 supported in a hollow sleeve 54 preferably cast integrally with I the vertical wall I. of the supporting frame.

mounted around the periphery of the control element with one leg overlying the flange II and the other extending rearwardly to engage operating members LSO and LSO-l, respectively, ofthe switches LS and LS-l. As will be seen by reference to Fig. 4, the dog Ii is substantially longer than the dog 80 so that their switch operating legs move in diflerent vertical planes,.the

switch operating members LSO and LSO -J being similarly spaced apart for engagement "by one s only. i

As it is frequently necessary to change the timing of the switches LS and LS--l, the dogs 60 and 8| are preferably adjustably secured to the control element. To this end, the flange BI is formed with an annular T-slot in which each dog is independently anchored by means of a T-headed bolt 66 and nut 85. By loosening the nut 85 the dogs may be shifted around the periphery of the control element and thus positioned to operate the associated switches at the instant the head l8 reaches any desired point in its travel. In practice, the dog 80 is set so as to close the switch 18 as the tool head moves out of retracted position and to open the switch when the head returns to that position. The dog Si is usually set to momentarily close the switch LSI just as the tool enters the work,preferably before the head reaches the upper end of its working stroke. -When so adjusted, the dog does not engage the switch operating member again until the head is retracted, thus avoiding unnecessary wear of the coacting parts.

The control element 42, in addition to operating the electrical switches as above described, also acts to rock the control element ll about the common axis of the elements for the purpose of operating the pilot valve V --3. As herein shown (Fig. 4), the control element II is in the form of While any ,suitable means may be utilized to I I rock the control element 42 in synchronism with the movements of the tool head ll, the mechaj nism." provided. for this purpose in the exemplary machine comprises a flexible traction member in the form of an endless chain 5! (Figs. 1-4) running over one sprocket wheel It keyedto the hub" of the control element and over a second sprocket i'l journaled onthe column. As shown 1 in Fig. 2,- the sprocket wheel 51 is rotatably. supported on a stud 55' anchored in an inwardly 1 projecting boss IQ of a plate which is bolted or otherwise rigidly secured to the side of the j column 10 adjacent the upper end thereof.

The sprocket wheels are positioned so that one executes something less than a complete revolution incident to, the movement of the head .j through its maximum range of travel.

In the a circular disk 80 having a relatively wide upstanding rim formed with an annular If-slot concentric with the axisof the element. control element is pinned on one end of a hollow shaft 68 which extends through the hub 52 and into the interior of the column l0.-

In the particular machine illustrated, the shaft i 68 is supported adjacent its outer end by a bearing 89 set in a recess in the hub" and at-its inner end in a bearing 10 formed in a removable cover'plate II utilized to cover an opening 12 in the side wall of the column. "I through which access is had tocertain parts of the control'mechanism. A third bearing 13 carried on a vertical supporting plate I4 bolted to the frame 43 supports the shaft at an intermediate point.

The shaft 68 is adapted when rocked in its hearings to operate the pilot valve V-3 and thus periodically reverse the direction of movement v of the tool head It. To this end, the shaft is provided with a rigid arm "adapted to engage v the actuator I6 of the pilot valve which, as herein shown, is mounted on the supporting plate "I4 below the shaft 68.

In the normal operation of the machine the shaft 68 is rocked to operate the pilot valve through the action of the control element l2.

When necessary, however, the shaft may be- I rocked manually by means of a hand lever 11 exemplary machine, the control element rotates through the arc indicated by the arrow A in Fig. '7 of the drawings.

For operating the switches LS and LS-l, the

1 control element is provided with a-pair of switch I actuators or dogs 80 and BI.

the dogs are of Z shape construction and are As herein shown,

(Fig. l) pivoted to the column l0 and operatively connected by a link I8 (Fig. 4) with a crank arm 19 fast on the shaft. A spring-pressed plunger operating in a socket in thearm l6 frictionally engages the plate I4 and tends to hold the shaft to either operated position.

The rocking of the shaft 88 by the control ele- Theabscess V ment 42 is eflecte'd through the medium of a shown in this The head is accordingly 1 series of stops adjustably carried on the control element 4|. As the pilot valve must be operated at the extreme limits of the tool stroke as well as at an intermediate position, marking one end of the working stroke, three stops are provided comprising limit stops 8| and 82 and intermediate stop 88. similar construction and, as shown in Fig. 4, are of L-shaped form having one leg overlying the flange 81 and the other extending rearwardly of the disk 88 toward the bottom 48 of the element 42. The stops are adjustably secured to the control element by means of T-headed bolts 84 seated in the T-slot in the element 4|. Thus the position of the .elements may be readily adjusted as required. I

Mounted on the bottom 48 of the control element 42 is a stop engaging member 88 in the form of a headed pin projecting into the interior of the cup-shaped control member in position to engage the stops as the member is rocked'by reciprocation of the head. On such engagement with the stops, the control element 4| and shaft 88 are rocked first in one direction and then in the other direction to operate the pilot valve 48.

The intermediate stop 83 defines the upper from the work, this stop is constructed so that it can be withdrawn from the path of stop engaging member-88 and thus avoid premature operation of the pilot valve.

Referring now to Figs. 4 and 6; the intermediate stop 83 as herein shown comprises an L- shaped bracket adjustably secured in the T-slot of theelement 4| .by a T-headed bolt 84 with one leg 88 projecting rearwardly of the control element. The leg 88* of the member is formed with an inwardly projecting lug on which a lever 88 is pivoted intermediate its ends. The outer end of the leveris formed with a rearwardly projecting finger 81 adapted to be positioned in the path of the stop engaging member 88 of the control element 42 when the lever is in one position and adapted to clear such member -when.

the lever is in the other position. A springpressed plunger 88 bearing against the outer end of the lever normally holds it in the path of the stop engaging member.

Referring more particularly to Fig. 6, it will be observed that one face of the finger 81 is beveled as at 88 so that the member 88'upon engaging the same when the element 42 is rocked in one direction simply acts to cam the finger forwardly without imparting movement to the control element 4|. By reason of this construction, the stop 88 acts as a skip stop permitting the tool head to advance fromretracted position and to the lower end of the working stroke without operating the pilot valve V8. In this movement, the control element 42 moves through the are indicated by the arrow Ain Fig. "I. As the head approaches the lower end of the working stroke;

I by the arrow B in Fig. 8. at which point the stop engaging member 88 engages the rear face of the finger 81 and thus rocks the control element 4| to operate the pilot valve to the position Limit stops 8| and 82 are of reversed and continues to reciprocate in its working stroke between the pomtions defined by the limit stop 82 andthe intermediate stop 88 until the finger 81 is withdrawn from the path of the stop engagi member.

As explained heretofore, fthe exemplary ma-'- chine is equipped-with automatic means for terminatingjMbperation of the machine at the limit of the working stroke of the tool head. In order to permit movement of the head to retracted position when the tool is to be withdrawn end of a predetermined interval sufllcient to flnv into the path of an annular flange 8| formed on a collar 82 slidable on the shaft 88. As herein shown, the collar 82 is secured by a pin 88 to a rod 84 which extends through the hollow shaft 88. A slot 88 in the shaft permits limited sliding movement of the rod and sleeve longitudinally of "the shaft, and in such movement the lever 88 is rocked about its pivot and into withdrawn position.

For shifting the rod 84, a collar 88 is secured thereto adjacent the rear of the supporting plate 14 by means of a pin 81 projecting through a slot 88 in the hollow shaft. The collar is adapted to be engaged by one arm of a bell crank lever 88 pivoted-on a bracket I88 secured to the plate 14, said arm being bifurcated so as to bear against the collar on opposite sides of the shaft 88. Bracket I88 also supports the solenoid SOL- 2 above and in alinement with the other arm of the bell crank which is connected by a.

link |8| with the armature I82 of the solenoid.

Upon energization of the solenoid, the bell crank is rocked about its pivot and through the medium of the sleeve 88 shifts the rod 84 to the right, as viewed in Fig. 4. The sleeve 82 is likewise shifted to theright and acts to rock the intermediate stop lever 88 to withdrawnposition. A

coiled compression spring I88 interposed between the sleeve 88 and a collar |84 pinned to the shaft 88 tends to hold the rod and associated parts in a normal position in which the intermediate stop lever is positioned for engagement by the stop engaging member 88. Accordingly, when the solenoid becomes deenergized, the lever 88 returns to its active position.

It will be apparent from the foregoing that they invention provides a honing machine of novel and improved construction in which the various elements areassembled in an advantageous manner to provide a machine of clean, compact construction requiring a minimum of headroom for 'that'they are not liable to be damaged by men working around the machine, and in turn are not likely to injure the workmen. The machine is thus not only efilcient and reliable in opera!" tion but is clean and attractive in appearance and entirely safe to operate. x

I claim as my invention:

- 1'.-A vertical typehoning machine having, in

driven means for rotating the spindle, means for i reciprocating the head totraverse the tool from 1 one end of the work piece to the other comprising a cylinder mounted within the column with its I 1 axis disposed substantially parallel to the reciprocating path 01 the head and with its upper end 1 disposed below the guideway in alinement, with the arm projecting from the head, a piston work- 1 ing in said cylinder, and area connecting said piston with said arm, control means for said reposed within said column and operatively con nected with said arm for rotating said member in timed relation to the reciprocation of the head. v 2. In a vertical type honing machine, in combination, a hollow upright column, a head mounted for reciprocation on said column, a tool spindle journaled on said head for carrying an expansible honing tool, power actuated means'ior expanding and contracting the tool, pressure fluid gactuated means ior reciprocating the head, a control system for the machine including a valve for controlling said pressure fluid actuated ;means,.a control device for initiating the operation of said tool expanding means, a control device for stopping the machine at the end or an operating cycle, and mechanism actuated by the head in its reciprocation for operating said valve and said control devices, said valve, said devices and said mechanism being assembled in a unitary jstructure on a common frame adapted to be mounted within the column of the machine;

3. The combination in a honing machine having a work support and a tool support, oi! power actuatedmeans for reciprocating one of said supports through a series of working strokes such as to traverse the tool over the work followed by a substantially longer withdrawal stroke to dissociatethe tool and work, a control element adapted to be rocked between two positions and operative in its movement from one position to the other to reverse the direction of 'movement'of the reciprocatory support, a plurality of stopsmounted on said member in spaced relation, a second control element mounted to rock about a common axisv with said first element, means for rocking said second element in synchronism with the movements of the reciprocatory support, and a'member carried by said second element positioned to engage said stops to rock said first element be tween its alternate positions, said stops being adjustable relative to each other to locate one stop for engagement by said member as the reciprocatory support approaches one end 01' its working to traverse thetool over the work followed a substantially longer withdrawal stroke to dissociate the tool and work, a control element adapted to be rocked between two positions and operative in its movement from one position to the other to reverse the direction of movement of the reciprocatory support, three stops mounted on said member in spaced relation, two of said stops being set to define respectively the limits of the working stroke and the third stop being set to define the limit of the withdrawal stroke of the reciprocatory support, a second control element mounted to rock about a common axis with said first element, means for rocking said second element in synchronism with the movements oi the reciprocatory support, and a member carried on said second element operative in the rocking ciprocating means including, a rotatable member carried on one side of the column, and means disof the element to engage saidstops independently and thereby'rock the flrstcontrol element from one position to another.

5. The combination in a honing machine having a reciprocatory support, of power actuated means for reciprocating the support, control means associated with said power'actuated means for reversing the direction or movement of the support at each end. of its stroke, said control means comprising a pair 01 control elements mounted to rock about a common axis, means for rocking one oi said elements in synchronism with the movements of the support, a pair of stops mounted on the other element in spaced relation, a stop engaging member carried by said one element operative to engage said stops alternately when the element is rocked whereby to rock said Q other element between two positions, a control device operated in response to the movement of said other element from either position to the other to reverse the direction of movement or the support and thereby confine the movements of the support within predetermined limits, and means for withdrawing one of said stops from th path of said stop engaging member to permit the support to move beyond one of said predetermined limits.

6. In a honing machine having a reciprocatory head, in "combination, pressure fluid means for reciprocating the head, a valve associated with said pressure fluid actuated means operable to reverse the direction of movement of the head, actuating means for operating said valve includ ing a circular element adapted to be rocked about a central axis between two positions, a pair of circumferentially spaced stops adjustably mountstroke, tolocate another stop for engagement by the member as the support approaches'the other ing a work support and a tool support, of power actuated means for reciprocating one of said supports through a series of workingstrokes such as the second element in synchronism with th ed adjacent the periphery of said element, a second control element mounted to rock about the axis of said first element, means for me 1 movements of the head, a stop engagingmemher carried by the second element adapted to engage said stop alternately and thereby rock the first element back and forth between said two positions, and means for withdrawing one of said stops from the path of'said member to cause the head to move beyond its normal working range.

'7. In a honing machine having a reciprocatory head, in combination, pressure fluid means for reciprocating the head, a valve associated with said pressure fluid actuated means operable to reverse the direction of movement of the head, actuating means for operating said valve including a circular element adapted to be rocked about a central axis between two positions, a pairv of circumferentially spaced stops adjustably mounted adjacent the periphery of'said element, a second control element mounted to rock about the axis of said first element, means for rocking the second element in synchronism with the movements of the head, a stop engaging memestates ber carried by the second element adapted to engage said stops alternately and'thereby rock the first elementback and forth between said two positions, means for withdrawing one said stops fromLthe path of said member to amplify the movement of th head beyondlts normal working range, and means operated by the second control element incident to the amplified movement ofthe head for stopping the machine.

8. A control mechanism for a honing machine through a series of working strokes to traverse the tool over the work, control mechanism including an element adapted to be rotated first in one direction and then in the other direction in. synchronism with the movements of said one support, a first control member carried by said element operative when the tool is associated with the work to initiate the expansion or the having a reciprocatory head, said mechanism comprising, a generally circular control element mounted to rock about a central axis between first element from one position to another where-- by to confine the movements of the headwithin predetermined limits, and means for withdrawing said intermediate stop from the path of said member to eflfect movement of the head beyond one of said predetermined limits to a retracted position, said member engaging the other of said limit stops to rock the first control element to its alternate position as the head approaches the retracted position.

9. A control mechanism for a honing machine having a reciprocatory head, said mechanism comprising, a generally circular control element mounted to rock about a central axis between two active positions and operative in each position to reverse the direction of movement of the head, a pair of limit stops adiustably supported same, and a second control member carried on said element operative to control the reciprocation of the support through said working strokes.

11. In a honing machine. in combination, a support for a honing tool, power actuated means on said support for expanding and contractingthe tool, a support for work to be operated on by said tool, power actuated means for moving one of said supports toward the other support to bring the tool and work into operative association and then to reciprocate said one support through a series of working strokes to traversethe tool over the'work, control mechanism ineluding an element adapted to be rotated first in one direction and then in the other direction in synchronism with the movements of said one support, a second control element operable between two positions to control the reciprocation of said one support through its working strokes, a member carried by the first element coacting with stops carried by the second element to oper- 1 ate the same from one position to the other, a control device for initiating the operation of said tool expanding and contracting means to expand the tool, and a dog carried by said second control element operative to actuate said control device when the tool is brought into operative association with the work.

12. In a honing machine, in combination, a I

. support for a honing tool, power actuated means in spaced relation around the periphery of said element, an intermediate stop mounted .on said element between said limit stops, a second control element mounted to rock about the axis of said first element, means for rocking the second element in synchronism with the movements of said head, a member on said second element by to confine the movements of the head within predetermined limits, means for withdrawing said intermediate stop from the path of said member to eflect movement of the head beyond one of said limits to a retracted position including a rod mounted coaxially of said control elements for endwise sliding movement, and an actuator shiftable with said rod and engageable with said stop, said member engaging the other limit stop to rock the first control member to its alternate position as the head approaches the retracted position.

10. In a honing machine, in combination, a support for a honing tool, power actuated means on said support for expanding and contracting the tool, a support for work to be operated on by said tool, power actuated means for moving one of said supports toward the other support to bring the tool and work into operative associaon said support-for expanding and contracting the tool, a support for work to be operated on by said tool, power actuated means for'moving one of said supports toward the other support to bring the tool and work into operative association and then to reciprocate said one support through a series of working strokes to traverse the tool over the work, control mechanism including an element adapted to be rotated first in one direction and then in the other direction in synchronism with the movements of said one support, a second control element operable between two positions to control the reciprocation of said one support throughits working strokes, a member carried by the first element coacting with stops carried by the second element to operate the same from one position to the other, a control device for the tool expanding and contracting means normally effective to maintain the tool in contracted condition, a dog carried by said second control element arranged to initiate the operation of said control device and thereby efiect expansion of the tool, said dog acting automatically when-the tool and work are operatively associated, and automatically operable means for releasing said control deviceto initiate contraction of the tool.

13. In a honing machine, in combination, a Q

reciprocatory support for carrying an expanstble honing tool, power actuated means on said support for expanding the tool, power actuated means for reciprocating said support, control mechanism including a control element adapted to be rocked through an arc proportioned to the movements of said support and in synchronism therewith, a controidevice associated with said tion and then to reciprocate said one support reciprocating means operable by said element [to efi'ect an initial advance of the support to operatively associate the tool and work and then to reciprocatethe support between predetermined limit positions to traverse the tool repeatedly over the work, a second control device operable by said element for initiating the operation of said tool expanding mechanism, and a third control device. operable by said element for stopping the machine.

14. 1n a honing machine, in combination, a

1 reciprocatory support for carrying an expansible honing tool, pressure fluid actuated means for reciprocating said support, power actuated means hollowsupporting frame,'a head mounted for reciprocation on said frame, a tool spindle Journaled on said head for carrying an expansible and contractible honing tool, power actuated means for expanding and contracting the tool, pressure fluid actuated means for reciprocating the head, a control system for the I vmachine including a valve for controlling said pressure fluid operated means, a control device for initiating the operation of said tool expanding means, a second control device for stopping the machine at the end of an operating cycle, and mechanism actuated .by the head in its reciprocation for operating saidvalve and said control devices, said'valve, said devices and said mechanism being assembled in a unitary structure on a common frame adapted. to be mount- ,ed within said hollow supporting frame.

16. In a honing machine, in combination, a

1 support for a honing tool, power actuated means for expanding and contracting the tool, a sup- "port for work to be operated on -by the .tool,

power actuated means for moving one of said supports toward the other support to bring the tool and work into operative association and then to reciprocate said one support through a series oi working strokes to effect a relative traverse of the tool and the work, control mechanism in-j eluding a movable element, motion transmitting means operable to drive said element continuous- 1y through a range substantially shorter than the working strokes of said one support first in one direction and then in the other direction in synchronism with the movements of the sup.-

and the work, control mechanism including a movable element, means for moving said element continuouslythrough' a range relatively smaller than the range or movement of the reciprocatory support first in one direction and then in the other directionin synchronism with the movements or said one support, valve means actuated by said element when the tool is associated with ,the work to initiate the operation or said first pressure fluid actuated means for expanding the tool into engagement with the work,

' and other valve means actuated by said element to control said second pressure fluid actuated means and thus eii'ect reciprocation of the support through said working strokes.

18. In a honing machine, in combination, a reciprocatory support for carrying an expansible and vcontractible honing tool, a first poweractuated means for reciprocating said support, a second power actuated means'ior expanding and contracting thetool, control mechanism including va control element adapted to be shifted through a range proportionedto the movements of said support and in synchronism therewith,

control means associated with said first power actuated means operable by said element to effect an initial advance of the support to operatively associate the tool and the work, to reciprocate the support between predetermined limit positions'for traversing the tool repeatedly over the work, and then to retract the support to disassociate thetool and the work, a second control device associated with said second power actuated means and operable by said element for initiating the expansion of the tool upon its I operative association with the work and for conreciprocatory support, power actuated means for port, means actuated by said'element when the v tool is associated with the work to initiate the expansion of the same, and other means actuated by said element to control the reciprocation of the support through said workin strokes 4 17. In a honing machine, in combination, 'a support for a honing tool, pressure fiuidactu- 1 ated means for expanding andcontracting the tool, a support for work to be operated .on by the tool, pressure fluid actuated means for movhas one of said supports toward the other support to operatively associate the tool and work and then to reciprocate said one support through a predetermined range in a' seriesot working, 1 strokes to eiiect a relative traverse or the tool race oi'said reversing element, astop engaging tracting the tool prior to its disassociation from the work, and a third control device operable by said element for stopping the machine.

19. In a honing machine, in combination, a

reciprocating said support, control mechanism for said power actuated means including a pair of,control elements mounted to rock about a common axis, means actuated by one of said elements for controlling the direction of movement of the support by said power actuated means, means for rocking the other of said elements through an arc proportioned to the range of travel of the support, a pair-of stops on said one element, a stop engaging member on the other eiementengageable alternately with said stops to operate said one element and thereby confine the movements of the support within predetermined limits, a control member movable axially of said control elements to withdraw one of said stops from the path of the stop engaging member to initiate movement of the support beyond one of said limits to a retracted position, and another stop on said one control element engageable by the stopengaging member to operate the elementas the support approaches the retracted position. i

20.*In a'honing machine, in combination, a hollow supporting irame,a support mounted for reciprocation on said irame, power actuated 'means for reciprocating said support, control mechanism for said power actuated means including a reversing element mounted to rock about a horizontal axis, a'control element disposed closely adjacent said reversing element and adapted to rock about the same axis, a pair of spaced "stops adjustably mounted on the member carried by said control element, a motion transmitting connection interposed between said support and said control element operative to rock the element through an arc proportioned to the range of travel of the support, said member engaging said stops alternately to confine the movements of the support within predetermined limits determined'by the positions of the stops, and meanssupporting said elements in a recess in one side of said frame with the face of said control element exposed to provide convenient access for adjustment of said stops.

CHESTER o. HOLLAND.

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