US1938761A - Machine tool - Google Patents

Description

DEC. 12, 1933. FR|T$cH| 1,938,761

MACHINE TOOL Filed Sept. 2, 1932 3 Sheets-Sheet l Dec. 12, 1933.

H. FRITSCHI MACHINE TOOL 5 Sheets-Sheet 2 Filed Sept. 2. 1932 ,1933. H. FRITSCHI I 1,938,761

MACHINE TOOL Filed Sept. 2, 1952 3 Sheets-Sheet 3 Patented Dec. 12, 1933 UNlTED STATES PATENT OFFICE Application September 2, 1932. Serial No. 631,532

Claims.

This invention relates to improvements in ma chine tools and especially to improvements in a machine for straightening cylindrical bars, tubes or the like.

5 An object of the invention is the provision of an improved bar straightening machine for automatically removing from said bar or other circular articles kinks or the like.

Another object of the invention is the provision of a bar straightening machine for circular articles that will automatically rotate the work during the straightening process for thereby presenting all portions of the work to the straightening mechanism.

A further object of the invention is the provision of improved means for rotating circular work pieces after'each stralg tening operation thereon and prior to the subsequent straightening operation so that each portion of the work is successively presented to the straightening mechanism instead. of having the mechanism continuously operate on one portionof the work, which must be manually actuated to properly present same. Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings, forming a part thereof, and it is to be understood that any modifications may be made in the exact structural details there shown and described 7 within the scope of the appended claims without departing from or exceeding the spirit of the invention. In the drawings: 7 Figure 1 is a top plan view of a straightening machine embodying the improvements of this invention.

Figure 2 is a fragmentary longitudinal sectional 1 view taken substantially on line 22 on Figure 1, showing, however, the supporting base in elevation.

Figure 3 is a transverse sectional view taken on line 3-3 of Figure 2.

Figure 4 is a sectional view taken on line 4--4 of Figure 3.

Figure 5 is an elevational view of certain portions of the machine illustrating certain details of the invention, as seen particularly from line 55 on Figure 1.

Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts.

A machine embodying the principles of this invention may comprise a bed or support 10 be- 55 heath which is disposed an electric motor or prime mover 11 having secured to its shaft a wide faced pulley 12. Trained about the said pulley is a flexible transmission member or belt 13 adapted to encircle alternately the loose and tight pulleys 1 1 and 15, the latter being keyed or otherwise secured to a driving shaft 16 rotatably journaled in the bed 10. In order to shift the belt 13 from one to the other of the pulleys 14 and 15, there is provided a shifter fork 17 secured to a slidable 7 rod 18 shiftable by means of the lever and shaft 19.

To stabilize the operation of the machine, the shaft 16 carries on opposite sides of the bed 10, fly wheels 20. Secured to the shaft 16 near one end thereof is a pinion 21 in mesh with a gear 22 secured to the shaft 23 journaled in the bed 19 and adapted to operate the straightening and rotating mechanism. The shaft 23 has formed intermediate its ends an eccentric 24 which is disposed interiorly of a block or head 25 vertically slidable in a way 26 formed in the end of a ram 2?. The ram 27 is formed in two parts, the rear portion 23 in which is formed the Way 26 and the operating portion 29 carrying at its forward end the anvil 30. The ram 27 is adapted to have the two portions extended from one another by means of a feeding wedge 31 which passes between them. By reference to Figure 1, it will be noted that the sides of the wedge 31 are providedwith V-shaped ribs respectively received in correspondingly shaped ways formed in the adjacent faces of the ram portions 28 and 29.

The wedge 31 is adapted to be vertically shifted for effecting the forward movement of the anvil 30 and for this reason a feeding mechanism is provided comprising a plunger 32 adapted to be axially shifted centrally of the forward portionof the ram 29. The plunger 32 upon engaging with a kink in the work 33 oscillates the bell crank 34 about its pivot for vertically shifting the rod 35 which in turn sets the clutch 36 to engage the stem 37 of the feed wedge 31. The clutch 3.6 is floatingly supported by means of springs 38 and 39. Rotation of the shaft 23, as above described, vertically shifts the block or head 25 relative to the way 26 and thereby axially reciprocates a rod 40 which has formed at its upper end a shoulder 41 normally in a position to engage the spring plate 42 secured to the end of a beam 43. 'Thebeam i3 is pivoted intermediate 105 its ends to a bracket or support 44 secured to the upper end of the plunger head 28. Theforward end of the beam 43 is pivoted to a feed actuator 45 having adjustable therein the abutment 46 which engages with the upper surface of the clutch member 36 when the said clutch is set for feeding engagement. The other end of the feed actuator 45 is pivoted to a bracket 47 that extends upwardly from the ram head 28.

From the foregoing it will be noted that rearward axial shifting of the plunger 32 through the bell crank 34 and rod 35 sets the clutch 36 to the stem of the feed wedge 31 so that upon vertical shifting of the block 25 the plunger 40 through its shoulder 41 will oscillate the beam 43 and through the feed actuator 46 lower the wedge 31.' This movement of the wedge 31 in a downward direction effects a further separationbetween the plunger portions 28 and 29' thereby advancing the operative portion of the anvil 30 so that upon the-next forward movement of the ram by means of the eccentric 24 the work 33 will be further straightened. This operation of the parts continues so long as a kink or bend in the work is in the way of the plunger 32.

As soon as the kink has been removed from the work, the following mechanism comes into play to effect an upward shifting or release of the feed wedge 31. Pivoted to the horizontal arm of the bell crank 34 is a lever 48 having formed at its rear end an abutment 49 which passes through a member 50 providing a shoulder 51 to co-operate with the said abutment 49. When the plunger 32 is axially shifted by the work the abutment 49 on the arm is raised above its co-operating shoulder 51 on the member 50 so that they do not engage one another. How ever, when the work piece does not shift the plunger 32 the co-operating abutment and shoulder 49 and 51 engage with one another for oscillat-ing the lever 52 for rearwardly axially shifting a rod 53 which has its one end pivoted to the lever 52. The rear end of the rod 53 has a sliding yielding connection as at 54 with the plunger 40 for shifting the said plunger to a position to dispose an abutment 40a on the plunger in position to engage the end 54a of the brake release arm 5417. This brake release arm has formed at its rear end a passageway through which the plunger 40 normally passes without engaging same. This arm is pivoted intermediate its ends at 540 to the bracket 44 and is further provided with the brake release portion 54d overlying the rear end of the clutch member 36.

The wedge 31 after each descent is held in its new position by means of a brake 55 which prevents the elevation thereof by the spring 56,

which has one end secured to the ram head 28 and the other end to a bell crank 5'7. The free end of the bell crank 57 is pivoted at 58 to the stem 37 of the feed wedge 31. The spring 56 tends at all times to elevate the wedge, but due to the brake 55 is restrained therefrom. The brake member 55 is yieldably urged into braking or holding position with the feed wedge stem by means of a spring 60 and the brake carries on its upper surface an abutment 59 which underlies the rear end of the clutch member 36. In the operation of the machine and with no pressure exerted on the plunger 32, the clutch 36 instead of being in its upper set position is in a lowered position and thereby free of the stem 37 of the feed wedge. At this time the co-operating abutment and shoulder 49 and 51 efiect the rearward axial shifting of rod 53 against the yielding resistance of the spring, which surrounds said rod for disposing in operative relation the abutment 40a, on the plunger 40, and the end 540;, of the brake release arm; Upward shifting of the plunger 40 now oscillates the brake release arm 54b in a counterclockwise direction for lowering the brake release portion 54d into engagement with the rear end of clutch member 36. Continued oscillation of said arm 54?) depresses the clutch member which through the abutment 59 actuates the brake 53 for releasing the wedge stem 37. Upon release of the wedge stem the springs 56 through the bell crank 57 effect an elevation of the wedge. A new work piece may now be disposed in operative relation to the ram and the above cycle repeated.

The bed 10 has formed integral with it at its forward end a bracket or lug member 61 adjacent which is a supporting surface 62 carrying the blocks 63. Abutting on the forward surfaces of the blocks 63 are the inner ends of adjusting screws 64 adapted to position the blocks relative tothe bed. Suitable clamping screws 65 pass downwardly through the blocks 63 for clamping them in adjusted positions. The forward faces of the blocks are each provided with a dove-tailed guide tongue 66 received in a correspondingly shaped groove formed in work supports 67. Secured to the forward face of the work supports are work carriages 68 on which the work is disposed during operation. The work carriages are adapted to be adjusted relative to the supports as by means of adjusting screws which carry the knobs 69. From the foregoing it will be noted that the work supporting mechanism is universally adjustable for disposing the axis of the work in a position for operation thereon by the ram.

In order to hold the work on the carriages and to properly position same prior to and during the operation thereon, there is provided feeler members 0 and 71 respectively disposed at the opposite ends of a carrier '72 which is secured to the forward end of arms '73 and 74. These arms are in turn respectively attached to connecting rods 75 and 76 which receive suitable eccentric portions of the shaft 23. The eccentrics for the connecting rods 75 and 76 are in advance relation to the eccentric 23 so that the feeler members 70 and 71 properly position the'work on the carriages prior to the engagement thereof by the plunger 32 and the operation of the parts as above described.

In the past it has been customary to manually rotate the work while being operated upon so as disposed in the housing '77. The housing 77 has projectingfrom its forward end a pair of lugs or ears 82 between which is disposed a bell crank or finger 83. The finger 83 is mounted on a shaft 84 carried by the housing cars 82 whereby may be oscillated in a counterclockwise direction by means of the plunger 78 which engages upstanding tail 35 on the end of the finger. With the parts in the position shown in Figure 4, it will be noted that the forward end of the finger 83 is yieldably held in engagement with the work 33. At this time, however, the work is not on the carriages 68 but is supported by the pairs of rollers 86 and 87 respectively disposed on opposite ends of the work supporting mechanism. With the work supported by the rollers, rearward movement of the ram will through the fingers 83 rotate said work.

In-order to remove the work from the carriages and to dispose same on the rollers 86 and 87, during the rotation thereof, the forward ram section 29 has depending from it a pin 88 having formed on its lower end a cam 89 co-operating with a nose 90 on the free end of a bell crank 91. The bell crank 91 is secured toa shait'92 which has its opposite ends journaled in the walls of the machine and projects beyond said walls. Secured to the projecting ends of the shaft are bracket members 93, see Figure 5, each of which has formed on it a guideway 94 receiving a slide member 95. The slide members 95 each have formed therethrough an elongated perforation 96 through which clamp bolts 97 pass into the bracket 93 and whereby the relative position of the slides 95 and the brackets 93 are obtained. Each pair of rollers 85 and 87 is rotatably carried by one of the slides 95 by means of suitable shafts 98,'

there being a shaft for each roller projecting from their supporting brackets.

In order to release the work from the rotating finger 83 upon reverse movement of the ram, so as not to reversely rotate the work, the said finger has secured to its under surface a block 99 adapted to co-operate with a latch 100 pivotedto the fixed part of the bed. The latch 100 is yieldably held as by means of a leaf spring 101 in a position for engaging the block 99 and thereby oscillating the finger 83 in a counterclockwise direction against the yielding resistance of its spring 80. This position of the latch is adjustably determined by the stop screw 103.

The operation of the work rotating mechanism is as follows: Just as the ram reaches its foremost position the work rotation finger block 99 passes off of the latch 100 so that the operative portion of said finger is now in engagement with the work. Retraction of the arm causes the cam 89 of the pin 88 to oscillate the arm 91 against the yielding resistance of the spring 102, asso ciated therewith, for actuating the brackets 93 and slides 95 in a counterclockwise direction, as seen in Figure 5. This elevates the pairs of rollers 86 and 87 for raising the work from the carriages and oscillates the finger 83 about its pivot shaft 84 against the yielding resistance of the spring 80.

The rollers 86 and 87 and the work are held in the elevated position during the retraction of the arm so that the work is rotated on the rollers. As soon as the arm has been retracted to a position to :effect engagement between the finger block'99 and latch 100 the said finger is further oscillated in a clockwise direction against the yielding resistance of the spring 80 which movement continues until the block 99 passes over the point of the latch 100. At about this time the rollers have been lowered to their normal inoperative position so that the work is now carried by the work carriage preparatory for engagement therewith by the ram.

What is claimed is:

1. In a straightening machine of the class described the combination of a bed, a work support carried by the bed, a ram carried by the bed and reciprocable toward and from the work support, means operable by the reciprocations of the ram for automatically rotating the work to present the entire surface thereof to the ram, and means for raising the, work from the support during the rotation thereof;

2. In a straightening machine for straightening circular metal objects the combination of a bed, a work support. mounted on the bed, a straightening ram reciprocably supported by the bed for movement toward and from the work for effecting its straightening, a work rotation finger carried work during the movement of the ram for rotating the same, and additionalanti-friction work supporting means for supporting the work during the rotation thereof, said supporting means comprising-rollers operable upon movement of the ram in one-direction for raising the work from its normal support.

4. In a straightening machine for straightening circular metal objects the combination with a bed, a work support adjustably mounted on the.

bed and normally supporting a work piece, and a reciprocable ram carried by the bed for movement toward and from the work, of means operable upon reciprocation of the ram for effecting rotation of the work and comprising a pivotally mounted finger pivotally connected to the ram, yielding means for actuating the finger about its pivot toward the work whereby movement of the ram in one direction effects the rotation of the work, and means for elevating the finger against the resistance of the yielding means when the ram is moving in the other direction.

5. In a straightening machine for straightening circular metal objects the combination with a bed, a work support adjustably mounted on the bed and normally supporting a work piece, and a reciprocable ram carried by the bed for movement toward and from the work, of means operable upon reciprocation of the ram for effecting rotation of the work and comprising a pivotally mounted finger pivotally connected to the ram, yielding means for actuating the fingerabout its pivot toward the work whereby movement of the ram in one direction effects the rotation of the work, means for elevating the finger against the resistance of the yielding means when the ram is moving in the other direction, and a supplemental work support normally inoperative for holding the work during the rotation thereof.

6. In a straightening machine for straightening circular metal objects the combination with a bed, a work support adjustably mounted on the bed and normally supporting a work piece, and a reciprocable ram carried by the bed for movement toward and from the work, of means operable upon reciprocation of the ram for effecting work, means for elevating the finger against the resistance of the yielding means when the ram is moving in the other direction, and a supplemental work support normally inoperative for holding the work during the rotation thereof, said a pivotally. mounted bracket for' the rollers,.and means associated with and operable by the ram for actuating the bracket about its pivot to actuate the supplemental work rest into operative position.

7. In a straightening machine for straightening circular metal objects the combination with a bed, a work support adjustably mounted on the bed and normally supporting a work piece, and a reciprocable ram carried by the bed for movement toward and from the work, of means operable upon reciprocation of the ram for effecting rotation of the work and comprising a pivotally mounted finger pivotally connected to the ram, yielding means for actuating the finger about its pivot toward the work whereby movement of the rain in one direction effects the retation of the work, means for elevating the finger against the resistance of the yielding means when the ram is moving in the other direction, and a supplemental work support normally inoperative for holding the workduring the rotation thereof, said supplemental work support including rollers, a pivotally mounted bracket for the rollers, means associated with and operable by the ram for actuating the bracket about its pivot to actuate the supplemental work rest into operative position, and yielding means for returning the supplemental work rest to its normal position.

8. In a shaft or other circular bar straighten ing machine :the combination with a 'bed, a normal work support on the bed, and a ram reciprocable relative to the bed toward and from the work, of means associated with the ram for efiecting the rotation of the work to present all portions of, its periphery to the ram, and a supplemental work support for supporting the work during its rotation and comprising a bracket ,pivotally mounted on the bed, a carriage adjustably secured to the bracket, supporting rolls rotatably mounted on thecarriage and adapted to normally underlie the work, an operatively associated with the bracket, and co-operating 'cam members carried by the ram and arm for effecting the oscillation of the arm and bracket carrying the supporting rolls whereby the supplemental work support removes the work from its normal support during the rotation of the work.

9. In a shaft or other circularbar straightening machine the combination with a bed, a normal work support on the bed, and. a ram reciprocable relative to the bed toward and from the work, of means associated with the ram for effecting the rotation of the work to present all portions of its periphery to the ram, and a supplemental work support for supporting the work during its rotation and comprising a bracket pivotally mounted on the bed, a carriage adjustably secured to the bracket, supporting rolls rotatably mounted on the carriage and adapted to normally underlie the work, an arm operatively associated with the bracket, co-operating cam members carried by the ram and arm for effecting the oscillation of the arm and bracket carrying the supporting rolls whereby the supplemental work support removes the work from its normal support during the rotation of the work, and yielding means for oscillating the arm in the opposite directionrfor returning the work to its normal support and rendering the supplemental support inoperative.

' 10. In a shaft or other circular bar straightening machine the combination with a bed, a

normal work support on the bed, and a ram reciprocable relative to the bed toward and from the work, of means associated with the ram for effecting the rotation of the work to present all portions of its periphery to the ram, and a supplemental work support for supporting the Work during its rotation and comprising a bracket pivot-ally mounted on the bed, a carriage adjustably secured to the bracket, supporting rolls rotatably mounted on the carriage and adapted to normally underlie the work, an arm operatively associated with the bracket, co-operating cam members carried by the ram and arm for effecting the oscillation of the arm and bracket carrying the supporting rolls whereby the supplemental work support removes the work from its normal support during the rotation of the work, yielding means for oscillating the arm in the opposite direction for returning the work to its normal support and rendering the supplemental support inoperative, and means rendering the work rotation mechanism inoperative when the Work is supported on its normal support.

HANS FRITSCHI.

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