US2050051A

US2050051A - Trimming machine

Info

Publication number: US2050051A
Application number: US662657A
Authority: US
Inventors: John H Friden
Original assignee: SUN TUBE CORP
Current assignee: SUN TUBE Corp
Priority date: 1933-03-25
Filing date: 1933-03-25
Publication date: 1936-08-04
Anticipated expiration: 1953-08-04

Description

Aug. 4, 1936.

J. H. FRIDEN TRIMMING MACHINE Filed March 25, 1953 8 Sheets-Sheet 1 lml u o a an Q mW MM NA INVENTQR. .fo H1 1 ATTORNEY 1936. J. H. FRIDEN 2,050,051

' TRIMMING MACHINE Filed March 25, 1933 8 Sheets-Sheet 2 BY M ATTORNEY Aug. 4, 1936. .1. H. FRIDEN 2,050,051

TRIMMING MACHINE I Filed March 25, 1935 8 Sheets-Sheet 3 INVENTOR 1011/0 fll Zrz'deh/ ATTORNEY 1936- J. H. FRIDEN 2,050,051

TRIMMING MACHINE Filed March 25, 1935 8 Sheets-Sheet 5 A TTORNEY Aug. 4, 1936.

J. H. FRIDEN 2,050,051

TR IMMING MACHINE Filed March 25, 1953 8 Sheets-Sheet 6 INVENTOR: Jomiil'h'dv ATTORNEY Aug. 4, 1936. J. H. FRIDEN TRIMMING MACHINE Filed March 25, 1933 8 Sheets-Sheet '7 Jam/[1? A TTORNEY 1936- J. H. FRIDEN 2,050,051

TRIMMING MACHINE Filed March 25, 1933 8 Sheets-Sheet 8 INVENTOR:

ATTORNEY struction disclosed Patented Aug. 4, 1936 TRIMMING MACHINE John H. Fridn, East Orange, N. J., assignor to The Sun Tube Corporation, Hillside, N. J., a corporation. of New Jersey Application March 25, 1933, Serial No. 662,657

18 Claims.

This invention relates to automatic machinery particularly adapted for-the trimming off of the end of a tubular member. The improved machine is especially suited for operation upon relatively thin walled, cylindrical members having a closed bottom and. formed of a metal which may become distorted upon the ordinary application of a cutting tool. In this connection a novel cutting method has been developed. It will be understood, however. that various phases of the invention are not limited to this particular use but may be applied to a variety of other situations.

The machine embodies a step by step rotary head having a series of work supporting chucks adapted to be shifted from one to another of a plurality of stations. In one position the articles to be trimmed are automatically and successively fed from a conveyor into the chucks. As the chucks reach another position they are rotated and a suitable trimming tool, capable of providing the article with a finished end, is rendered effective. In a third position the finished articles are automatically discharged. It will be understood that all of the operating parts are so timed and related that upon each step of rotation of the head a work piece will be inserted in one of the chucks, another chuck will be rotated to permit the trimming to be performed and a third chuck will be opened to allow the finished article to be discharged.

It has been a primary object of the invention to provide a simple, eflicient and compact machine of the character indicated capable of rapidly performing the trimming operations. The conis particularly applicable to the trimming of the ends of extruded or drawn cup-like members formed of a metal such as zinc. This renders the machine especially suited to the trimming of extruded battery cups and the like.

Various other objects and advantages of the invention will be made apparent as an illustrative machine is described in greater detail in conjunction with the accompanying drawings in which:

Fig. 1 is a top plan view of a machine embodying the invention.

Fig. 2 is a side elevation of the machine with a few parts broken away and shown in section.

Fig. 3 is a front elevation of the machine on a larger scale.

Fig. 4 is an enlarged detail, partly in elevation and partly in section, of certain cam actuated linkage for controlling the cutter,

Fig. 5 is an enlarged vertical, transverse section along the line 55 of Figure 2.

Fig. 6 is an enlarged top view of one of the chucks in the cutting position.

Fig. '7 is a vertical section through the chuck 5 along the line 1-1 of Figure 6.

Fig. 8 is a detail in section showing the chuck of Figure '7 with its jaws released. I

Fig. 9 is an enlarged detail partly in elevation and partly in section along the line 9-9 10 of Figure 4 of the cutter carriage and associated parts, and

Fig. 10 is an enlarged detail showing a portion of Figure 9 with the parts in shifted position.

Referring now to the drawings, particularly Figure 1, the machine embodying the invention comprises a supporting frame l0 having suitable legs II for holding the mechanism at an appropriate elevation above the floor. Power for the operation of the machine may be derived from any suitable source. For example a pulley I2 may receive power from a motor or a line shaft through a belt 13. The pulley may be secured to a shaft it, carried by a. bearing bracket l5 secured to the frame, and also journaled in a bear- 5 ing It. At an intermediate point a pinion I1 is secured to the shaft and meshes with a large gear l8 secured to a shaft l9. Above the shaft l9 there is located a parallel shaft 20. Suitable connections, preferably 9. Geneva gearing are provided between the two shafts, the arrangement being such that upon each revolution of the shaft I9 the shaft 20 will be given one step of movement, say a one-quarter turn. This will be accomplished in a. corresponding portion of the rotation of shaft l9 and during the balance of the rotation of this shaft the shaft 20 will be held stationary. For this purpose a Geneva roller 2| may be carried by an arm 22 secured to the shaft l9 and may cooperate, in well-known manner, with notches in a Geneva wheel 33 secured to shaft 20. A locking disk 24 carried by shaft l9 serves to prevent overthrow of the Geneva wheel and locks it against turning between the successive steps, in the usual way of a Geneva lock.

Adjacent its forward end the shaft 20 carries a large disc or head 25 which supports a plurality of chucks, designated generally as 26 in Figure 5. Four of these chucks are shown although three will be sufiicient for the particular purposes of the illustrative machine. It will be apparent that the number and-arrangement of the chucks may be varied to suit the particular requirements. Inasmuch as all of the chucks are of similar construction it will be necessary only 55 to describe one of them in detail. Referring to Figures 6 and 7 there is provided a bearing member 21 for each of the chucks having a reduced portion 25 at its end adapted to be passed through an aperture in the disc 25. The bearing member is secured to the disc by means of machine screws 25. Within the bearing member is mounted a chuck supporting spindle or shaft 30. Beyond the forward end of member 21 an enlarged collar portion 3| is provided on the spindle to prevent further inward movement of the spindle. At its inner end the spindle is provided with a detachable end portion 52 secured to the main part by means of a hollow screw 33. For a reason to be explained hereinafter the spindle is provided with a passage 34 from end to end in communication with a passage through the screw 33. Between the end of member 28 and a shoulder on the portion 32 there is mounted a grooved wheel 35 which is secured to the spindle by means of a set screw 35.

Forwardly of the collar 31 there is secured to the spindle a chuck-jaw supporting member 31 having pairs of ears 38 carrying pivot pins 39 for pivotally supporting the jaw members 40. Each jaw may have secured thereto, as by the screws shown, a plate 4!. At its inner end each jaw member has pivotally connected thereto a toggle link 42 whose other end is pivotally attached to a slidable member 43 mounted for rotation and axial movement upon the bearing member 21. Member 43 is formed with a groove 44 which receives a roller 45 at the upper end of each of a pair of bifurcated arms 46 that straddle the member. These arms are a part of a bell crank lever pivoted at 41 upon a support 48 secured to the hub of the disc 25 by a screw 49. The bell crank lever has a forwardly extending arm 50 which carries a roller 5| mounted for rotation on the arm by means of a screw 52. A spring 53 mounted over a stud 54 on the disc and over a similar stud 55 on the bell crank tends to rock the bell crank in a clockwise direction, Figure '7. This serves to slide the member 43 forwardly and by the action of the links 42 forces the jaws of the chuck together under spring pressure. In order to separate or disengage the jaws from the work piece the roller 5i cooperates with a cam surface secured, as by means of screws 51, to a portion of the frame IO. As will be made more clear hereinafter the cam surface 56 is so formed as to have a high portion in the path of the roller 5i, as the latter is carried around by the head or disc 25, over that portion of the cycle at which the article is to be gripped and a low portion over that part of the cycle at which the article is to be released. Its form is clearly indicated in Figure 5. The closed and open positions of the jaws are indicated in Figures '7 and 8 respectively.

Each jaw member carries a spring pressed gripping element 58. This is slidable in an aperture in the jaw and is urged toward the article to be gripped by means of a spring 59 secured by a screw 60. The end of each plunger element is inclined slightly to the axis of the chuck, as shown in Figure 7, even when the article is gripped. This provides a corner 6| which lightly retains the article even though the jaws are not together but it will not prevent removal of the article under a more positive action. The purpose of this will be made more apparent hereinafter.

We may now consider the means provided for automatically feeding the work pieces successive- *ly between the jaws of the chucks. This mechanism is most clearly shown in Figs. 1, 2, and 3.

. The article upon which the present machine is adapted to operate is an elongated, cup-like element 52, whose form is most clearly indicated in Fig. 8. It may be in the form, for example, of an extruded battery cup having an open mouth with an irregular contour and a flat, closed bot tom. The present machine is especially suited for the trimming of the irregular ends of these cups. They may be deposited in any suitable way, either by hand or automatically, from some other machine or conveyor upon a belt 63. At each side of the belt there may be arranged a chain 54 of suitable construction, ca rying a series of spaced, upstanding pins 65. The pins on the two chains should be aligned transversely of the belt, as best shown in Fig. 1. On each chain the pins should be suitably spaced to hold the articles an appropriate distance apart and to permit them to be introduced succesively at appropriate intervals into the path of certain operating devices. The outer ends of the belt and chains may be suitably supported upon a pulley and sprockets carried by a shaft 66 journaled in a portion of the frame. At their inner ends the chains are carried by a pair of sprockets 61 secured to a shaft 68 while the belt travels around a pulley 69, also secured to this shaft.

Suitable connections are provided for continuously rotating the shaft 68 at an appropriate,

relatively slow speed. For this purpose the shaft is connected by a universal joint 10 with a slightly inclined shaft H, whose opposite end is connected by another universal joint 72 with a short shaft 13 parallel with, but offset from, the shaft 68. A

sprocket 14 is secured to the shaft 13 and cooperates with a chain I5 which extends transversely of the machine and is supported at its opposite end by means of a sprocket 16 carried by a shaft 17. The bottom course of this chain as it passes from the sprocket 16 to the sprocket I4 is carried over an intermediate sprocket 18 connected in any suitable way to rotate with a large sprocket 19. This sprocket is driven by a chain which is in turn driven by a sprocket 8| secured to the previously mentioned shaft l9. It will be apparent that through the connections explained, the chain 15 will be continuously shifted in the direction indicated by the arrows (Fig. 3) by power derived from the shaft IS. The rotation thus imparted to the shaft 13, and in turn to the shaft 68, will be at a relatively slow speed due to the reduction between the pinion I7 and gear I8 and the further reduction between the sprocket iii and the sprocket 19. Now, as the conveyor 63 advances, the cup carried by the pins approaching the inner end of the conveyor will be dropped into a V trough 82 carried by a portion of the frame. As best shown in Fig. l, a wall of the trough is notched, as indicated at 83, to permit the pins to pass through as the cup is deposited in the trough.

After the cup has been placed in the trough, a plunger 84. which is directly in line with the opening in the cup, is shifted toward the left (Fig. 1) until it engages the closed bottom of the cup and forces the latter into the open jaws of that chuck which, at this time, happens to be aligned with the trough, as indicated in Fig. 8.

For the purpose of shifting the plunger in this and 89 may be secured to a rod and a block 80 is slidable on the rod." The block is normally held, by means of a spring 9|, against the collar 89. Pins 92, projecting from the sides of the block, are engaged by the forked extensions of a lever 93 pivoted at its lower end upon a pin 84 carried by a portion of the machine frame. Intermediate its ends the lever "is provided with an elongated slot 95. A block 95, carried by a disc 91, cooperates with the slot so that upon rotation of the disc the lever will be rocked about its pivot.

It will be understood that the block 96 is pivotally carried by the disc and its position on the disc may be made adjustable, if desired, so as to vary the stroke of the lever. For this purpose the pivot of the block may be shifted to any suitable position along a diameter of the disc.

For the purpose of rotating the disc 91, it is secured to a shaft 98 having a bevel gear 99 secured at its opposite end. A bevel pinion I00, meshing with the gear 99, is secured to a shaft IOI, which also has secured thereto a sprocket I02. This sprocket is connected by means of a chain I03 with a sprocket I04 secured to the shaft I4 that receives power from the pulley I2. It will be apparent that through the connections indicated the lever 93 will be reciprocated once upon each rotation of the disc 91. The movement thus imparted to the rod 86 will be somewhat faster,

at its maximum, as it is shifted toward the right in Fig. 2 than when it is shifted toward the left. This is for the reason that the lever arm through which the block 96 is acting in shifting the rod toward the right is somewhat shorter than that through which it acts in shifting the rod to the left. This is desirable inasmuch as the active movement of the plunger 84 toward the left should not be made too rapid at any time. The

spring 9| enables a yielding pressure to be ex erted by the plunger against the bottom of the cup toward the end of the movement of the plunger toward the left. This spring may, if desired, be made of suflicient length to prevent jamming of the parts in the event that the free movement of the plunger toward the left is interfered with. As the cup is forced between the jaws of the chuck upon the movement of the plunger toward the left, the spring-pressed elements 58 will yield slightly and when the cup is properly located, they will lightly grip its outer surface. As the plunger is now withdrawn from the cup, the corners SI of the elements 58 will serve to retain the cup and prevent it from following the retractive movement of the plunger.

After the plunger 84 has been fully withdrawn from the cup, the head or disc 25 will be rotated through a quarter turn by means of the Geneva motion, previously explained. During the initial portion of this clockwise movement of the head (Fig. the roller 5| will ride off of the high portion of the cam 56 and will permit the spring 53 to close the jaws of the chuck in the manner already described. As the rotation of the disc continues, the pulley wheel 35 on the spindle of this particular chuck will be carried into cooperation with a friction wheel I05 adapted to engage the surface of the pulley, within the groove. The disc I05 is secured to a shaft I06 carried by a frame I01 pivotally supported at I08 upon a portion of the main frame. A spring I09, bearing downwardly upon the frame I01 forwardly of its pivot, serves to yieldingly press the disc I05 into engagement with the pulley 35. The clockwise movement of the frame I01 (Fig. 2) may be suitably limited by means of a set screw IIII. Any

suitable means, such as the handwheel shown, may be provided to vary the tension of the spring I09. A clutch III serves to couple the shaft I08 with a shaft II2 carrying a sprocket wheel II3. This sprocket is connected by a chain II4 with a wheel II5 secured to the drive shaft I4. Through the connections explained, the shaft I08 and friction wheel I05 will be rotated at a suitable speed. This in turn will serve to rotate the particular chuck which happens to be In the uppermost position on the head at any given time. The speed of rotation will be suillcient to permit the cutting operation, which will be presently explained, to be carried out under the appropriate conditions.

This leads us now to the operation of a cutter I I6, which is adapted to be introduced an appropriate distance into the cup and then rocked downwardly into engagement with the interior surface of the cup. This is at a time when the cup is being rotated to carry its wall at a cutting speed so that the end of the cup will be trimmed off. For the purpose of imparting the necessary movements to the cutter, it is secured by a pair of set screws III within a sliding carriage I I8. This carriage is slidable along ways II9 secured to, or integral with, a frame I20 pivoted by means of a pin I2I upon a portion of the main frame. The carriage is provided with a forked portion I22 with which cooperates a block I23 pivotally carried by a pair of arms I24.-

These arms are carried by a stud or shaft I25 mounted in the main frame and having secured at its outer end an arm I26. The latter in turn is connected by a link I 21 with an arm I28 secured to a rock shaft I29. For the purpose of rocking this shaft, there is secured thereto an arm I30 to which is connected a link I3I. The lower end of this link is provided with an elongated opening I32 surrounding the shaft I9. A roller I34, rotatably mounted upon the lower end of the link, cooperates with a cam I35 secured to the shaft I9. The roller is held against the cam by means of a pair of springs I36 connected to an arm I31 secured to the shaft I 29. As will be seen best in Fig. 4, the springs I36 tend to lift the link I3I and hold the roller against the cam. It will be recalled that the shaft I9 is continuously rotated by the gearing I'I, I8 which connects it with the drive shaft I4. It will be apparent that as the cam I35 rotates in the direction indicated by the arrow, the roller I34 will eventually drop from the high point of the cam so that under the action of springs I36, the shaft I29 will be rocked counter-clockwise (Fig. 4). This will cause the carriage II8 to be retracted. i. e., shifted toward the right in Fig. 9. As the rotation of the cam continues. the link I3I will be positively drawn downwardly against the action of springs I36 and the cutter will be shifted into the open end of a cup. The length of the link I3I may be varied slightly so as to vary the extreme positions of the cutter carriage. By suitable adjustment of the link. the length of the cup remaining after the end has been removed may be varied to suit the particular rquirements.

A somewhat similar mechanism is provided for rocking the frame I20 during the cutting operation. There is secured to the shaft I2I an arm I38 connected by a link I39 with an arm I40 secured to a shaft I. Also secured to this shaft is an arm I42, to which is connected a link I43. The lower end of this link is provided with an' elongated opening I44, which receives the shaft I 9. A roller I45, carried by the end of the link cooperates, with a cam I45 to control the movements of the link I43. The springs I" also tend to lift the link I43 to maintain the roller I45 in engagement with the cam I45. For this purpose the springs I35 are connected with an arm I41 secured to the shaft I. The arrangement is such that the cutter I I5 will be rocked downwardly from the position indicated in Fig. 9 to the position indicated in Fig. 10 by means of the positive action of the cam I46 with the carriage H8 in its left-hand position. Upon the completion of the cutting operation, the carriage may be retracted and the frame I20 may be subsequently, or simultaneously, returned to its Fig. 9 position.

There are various advantages of the particular method of trimming the end of the cup provided in this machine. It will be found, in the first place, that the outward pressure against the inner wall of the cup will produce no distortion whereas an inward pressure against the outer wall might very readily result in deformation of the contour of the cup. This would not only spoil the article but would interfere with the cutting operation. Another feature to be observed is that the cutter is provided with two cutting edges. The material of the tube is first cut through by means of the point I 48 of the cutter and this is followed by the action of the edge I49, which serves to remove any burr that might be left by the point. Another advantage of the cutting operation provided in this machine is the easy disposal of the trimmed ends of the cups. As the carriage I I8 is retracted from the position shown in Fig. 10, the end of the cup will drop from the end of the cutter into any suitable receptacle or onto a chute, which may serve to discharge the waste material to one side of the machine. Other advantages will be apparent from a careful consideration of the construction.

In order to insure the removal of the trimmed tips from the cutter I I6, in the event they do not slide off by gravity, a striker bar 6a is provided just above the cutter. It will be apparent that as the cutter is elevated toward its Fig. 9 position and is retracted, the striker bar will sweep any remaining trimmed end from the cutter. The bar may be adjustably attached to the frame of the machine by screws 5b.

Upon completion of the trimming operation, the chuck carrying the trimmed cup will be shifted again by the Geneva movement out of the position at the top of Figure 5 into the position at the right of this figure. As the chuck approaches the new position, the roller 5| will ride out upon the high part of the cam 56 and through the rocking of the arm 45 will cause the jaws of the chuck to be spread apart. The cup will, however, still be lightly retained by the plunger elements 58. In this position of the chuck its spindle will be directly aligned with a connection I50 at the end of an air discharge line. The end ISI of the detachable portion 32 of the spindle is provided with a beveled or sloping edge adapted to cooperate with a similar formation, shown in dotted lines in Figure 7, at the mouth of the connection I50. The latter, as will be understood, may be arranged to yield slightly as the spindle is carried into position and it may then be held yieldingly against the seat I5I. Air may be conveyed to the connection I50 from any suitable source by means of a line I 52. If desired the air may be discharged continuously through this line or, if preferred, a valve may be. provided to control the intermittent discharge of air at the appropriate time. Such a valve may be operated by any suitable portion of the oper- 5 ating mechanism of the machine and its operation may be so timed as to discharge a blast of air after the parts I50 and I5I have been brought into proper alignment. The air so discharged will pass through the spindle and be directed against the bottom of the cup, which will thus be blown from the chuck into any suitable receptacle or to a conveyor conveniently located for the purpose.

Upon the next quarter turn of the head or disc 25 the chuck from which the cup has just been removed will be shifted into the lower position (Fig. 5) where it remains entirely idle. In the meantime the chuck which was in the lower, idle position will have been shifted to the posi- 20 tion at the left of Fig. 5, where it will receive a cup from the trough 82, in the manner explained. Thus, upon each cycle of the machine, while the head 25 is held stationary, a cup will be entered in the chuck at the left while the 25 upper chuck is rotated and the cutter is shifted in relation to the cup to trim the latter, and the chuck at the right will have its finished cup discharged by the air. It will be understood that the gearing from the power source to all of the operating parts of the machine will be suitably timed to perform the various functions in the manner indicated.

In order that the machine may be adapted for the trimming of cups of different diameters, provision is made for the adjustment of the trough 82. This trough is carried by a table I53 which may be lifted or lowered, as desired, by the tuming of a handwheel I54. This handwheel has threaded engagement with a spindle I55 which is secured to the table I53 at its upper end and is adapted to shift the table as the spindle is moved longitudinally by the handwheel. It will be apparent that in this way the table will either be raised or lowered, depending upon the direc- 45 tion of rotation of the handwheel. A spring I 56 may be provided between the table and a portion of the fixed frame for the purpose of taking up the play in the parts and for frictionally locking the handwheel against accidental rotation. The shaft 58 is also carried by the adjustable table so that the lower end of the delivery conveyor will be shifted upon the adjustment of the trough. It will be apparent that when the larger cups are to be trimmed, the table I53 will be 55 lowered to the point where the trough will hold a cup with its axis properly aligned with the jaws of the chuck. In adapting the machine to act upon cups of larger diameter, it will be necessary, of course, to replace the chucks by similar structures capable of retaining the larger cups.

The operation of the machine has been described so fully in conjunction with thedetailed description of the various portions of the machine that a summary of operation is believed to be unnecessary. It may simply be mentioned by way of summary that the cups or similar articles to be trimmed are successively fed by the conveyor 63 into the trough 82. For this they are fed by the plunger 84 between the open jaws of that one of the chucks which at this moment happens to be at the left in Figures 3 and 5. At the same time the upper chuck will be rotated and the cutter II 5 will be moved inwardly and rocked downwardly, to trim off the end of the cup then carried by the upper chuck, and will be subsequently retracted. In the retraction of the cutter the trimmed end will be dropped and conveniently disposed of. At the same time the cup carried by the right-hand chuck, whose laws are then open, will be blown from the machine by a blast of air delivered through the line I52. When these three operations, which are simultaneously conducted, are-completed the head 25 will be rotated a quarter turn and the same operations will be repeated. It will be understood that the timing of the parts is such that upon each step of movement of head 25 the plunger 84 will be reciprocated once, the cutter carriage will be reciprocated and rocked once, and the upper chuck will be rotated sufficiently to eifect the trimming operation. Furthermore the conveyor 63 will move at the appropriate speed and will be so timed as to drop a new cup into the trough 82 each time the plunger 84 is fully retracted. While a machine embodying the features of the invention has been described in considerable detail, and a preferred method of operation has been set forth, it will be understood that these are merely for the purpose of clearly illustrating and pointing out the invention and that numerous changes in the form and arrangement of the parts and in the particular mode of operation may be made without departing from the general spirit and scope of the invention.

What I claim is:

1. Ina machine of the class described an intermittently rotatable head, a plurality of work holding means on said head constructed and arranged to retain hollow articles, a reciprocatory plunger aligned with one of said holding means in each position of the head and adapted to entering a hollow article and engage the bottom thereof to force the same into said holding means, means for rotating another of said holding means in each position of the head, means for discharging an article from another of said holding means in each position of the head, and common operating means for imparting step by step movement to the head, reciprocating said plunger, and rotating said second mentioned holding means, said plunger being given a continuous reciprocatory movement.

2. In a machine of the class described an intermittently rotatable head, a plurality of chucks rotatably mounted on said head, means effective upon movement of said head for opening the jaws of the chucks in certain positions and closing the jaws in another position assumed upon movements of said head, means for automatically introducing and discharging articles with relation to the chucks when open, gripping means yieldingly mounted on the chuck jaws for retaining the articles when the chucks are open, means for rotating the chucks when in said other position, and means for shifting a tool into cooperative relation with an article held by the rotating chuck.

3. In a machine of the class described an intermittently rotatable head, a plurality of chucks rotatably mounted on said head, a stationary cam, means on said chucks cooperating with said cam to control the opening and closing of the jaws of the chucks upon movements of the head, means for automatically introducing and removing articles with relation to the chucks when open, gripping means yieldingly mounted on the chuck jaws for retaining the articles in the chucks when the latter are open, and means for rotating the chucks when closed.

4. In a machine of the class described, a work supporting chuck, a hollow spindle rotatably supporting said chuck, means for rotating said chuck, a cam means for controlling the opening and closing of the jaws of said chuck, a plunger for introducing an article into the chuck when open, means yieldingly carried by the chuck laws for lightly retaining the article when the chuck is open, and means for discharging a fluid medium through said spindle to remove an article from the chuck when the chuck is open.

5. In a machine of the class described a ro-- tatable spindle, a plurality of chuck jaws pivoted upon said spindle, means for rotating said jaws, means for opening and closing said jaws, means for inserting an article into and removing an article from said jaws when open, and yielding means in said jaws for lightly retaining an article while the jaws are open.

6. In a machine of the class described a 1'0- tatable spindle, a plurality of chuck jaws pivoted upon said spindle, means for rotating said jaws, a reciprocatory plunger for inserting an article between said jaws, means for directing a fluid between said jaws to remove the article, and yielding means in said jaws for lightly retaining an article while the jaws are open.

'7. In a machine of the class described means for supporting a hollow tubular member, means for rotating said supporting means, a tool carriage, means for sliding said carriage to introduce a cutting tool into said member, and means for rocking the carriage bodily to eifect cutting engagement between the tool and member.

8. In a machine of the class described means for supporting a hollow tubular member, a tiltable frame, a tool carriage slidable on said frame,

and means for sliding said carriage and tilting said frame to carry a tool into cutting engagement with said member.

9. In a machine of the class described means for supporting a hollow tubular member, means for rotating said supporting means, a tool holder, means for shifting said tool holder to carry a tool into said member, and separate means for moving the cutting portion of the tool transversely across the rotating tubular member.

10. In a machine of the class described a rotatable head, a plurality of work supporting means on said head, a conveyor for delivering thin walled tubular work pieces in line with said supporting means when in one position, means on said conveyor for retaining said pieces in spaced relation, a reciprocatory feed member, means for imparting step by step movement to said head to carry said supporting means successively into line with said member, and means for reciprocating said member to transfer the work pieces carried by said conveyor to said supporting means.

11. In a machine of the class described a ro tatable head, a plurality of work holders on said head, a work piece receiving trough, means for adjusting the position of said trough independently of said conveyor, a conveyor for successive- 1y delivering work pieces into said trough, means for intermittently rotating said head step by step to carry said work holders successively adjacent said trough, and means for transferring work pieces from said trough to said work holders successively.

12. In a machine of the class described means for supporting and rotating a hollow tubular member at a cutting speed, means for supporting an elongated cutting tool, means for quickly sliding said supporting means to carry the cutter into the interior of the tube, and separate means for more slowly moving the point of the cutter outwardly through the wall of the tube.

13. In a machine of the class described rotatable means for supporting a hollow tubular article, means for rotating said supporting means, a tool holder, means for retaining a cutter thereon, cam means for shifting said holder to carry the cutter into said article and separate cam means for shifting said cutter outwardly through the wall of the article.

14. In a machine of the class described rotatable means for supporting a hollow tubular article. means for rotating said supporting means, a tool holder, means for retaining a cutter thereon, a pair of cams, means controlled by one of said cams for carrying the cutter into said article, means controlled by the other of said cams for shifting the cutter outwardly through the wall of the article, and common spring means for urging portions of said cam controlled means against said cams.

15. In a machine of the class described a rotatable chuck, means for carrying hollow articles to a point adjacent said chuck, a reciprocatory member for transferring articles from said point to said chuck, and means for operating said member comprising a continuously rocking element and means for operating the same more quickly in one direction than the other.

16. In a machine of the class described a rotatable chuck, means for carrying hollow articles to a point adjacent said chuck, a reciprocatory member for transferring articles from said point to said chuck, and means for operating said member comprising a slotted lever and a'rotatable disk having an element cooperating with the slot in said lever.

17. A machine for trimming hollow, thinwalled metal tubes which comprises a support arranged to retain a tube-with its end to be trimmed extending freeLv therefrom, means for 10 rotating said support to carry the tube at a cutting speed, means for supporting a cutting tool, means for moving said tool supporting means to carry the cutting point of the tool quickly into the tube through a predetermined distance out of 15 cutting engagement with the tube and then more slowly moving the cutting point of the tool outwardly through the wall of the tube.

18. A machine for trimming hollow, thinwalled metal tubes which comprises a support 20 arranged to retain a tube with its end to be trimmed extending freely therefrom, means for rotating said support to carry the tube at a cutting speed, means for supporting a cutting tool, means for moving said tool supporting means to carry the cutting point of the tool quickly into the tube through a predetermined distance out of cutting engagement with the tube and then more slowly rocking the cutting point of the tool outwardly through the wall of the tube..

JOHN H. FRIDEN.