This invention relates to turret indexing mechanism and more particularly for lathes, especially turret lathes. This application is a division of a copending application Serial No. The purpose of the invention is to effect an improved turret indexing mechanism adapted for automatic operation, in which all of the different working positions of the turret may be effected one after another if desired or some of them may be selectively passed over during the indexing, as predetermined by the adjustment of the mechanism. A further purpose is to provide improved transmission mechanism for tool and work supporting units or supports of a machine tool, and in a form, for improved cooperative relationship between different units. A further purpose is to provide an improved control mechanism for the transmission mechanism of tool and work supports of a machine tool, and particularly to provide controls for the individual supports suited for cooperation and interconnection between the controls of different supports.
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This invention relates to turret indexing mechanism and more particularly for lathes, especially turret lathes. This application is a division of a copending application Serial No.
The purpose of the invention is to effect an improved turret indexing mechanism adapted for automatic operation, in which all of the different working positions of the turret may be effected one after another if desired or some of them may be selectively passed over during the indexing, as predetermined by the adjustment of the mechanism.
A further purpose is to provide improved transmission mechanism for tool and work supporting units or supports of a machine tool, and in a form, for improved cooperative relationship between different units.
A further purpose is to provide an improved control mechanism for the transmission mechanism of tool and work supports of a machine tool, and particularly to provide controls for the individual supports suited for cooperation and interconnection between the controls of different supports.
A further purpose is to provide transmission and control mechanism which incorporates fluid or hydraulic operated devices in an improved form and relationship. A further purpose is to provide control mechanism in which both hydraulic and electric operated devices are incorporated, each for preferred individual purposes, and cooperatively interconnected for effecting combination control effects. A further purpose is to provide an improved automatic control mechanism for machine operation, particularly where the machine cycle includes sub-cycles of operation of different units or supports, and particularly for turret lathes.
A further purpose is generally to simplify and improve the construction and operation of machine tools and of certain tool or work supporting. Still other objects will be apparent from the specification, it being understood that the invention includes the methods and structures herein illustrated, described and claimed and such other methods and structure as are equivalent to the methods or structures of the claims.
The same reference characters have been used for the same parts throughout, and in the drawings: Figure 1 is a front elevation of an automatic turret lathe incorporating the invention. Figure 2 is an enlarged plan view of a turret and its carriage, together with some of the control mechanism shown at the right end of the machine of Pig.
Figure 6 is a plan view of a clamp ring structure shown in Fig. The lathe of Fig. Slidably guided on suitable ways on bed 50 for longitudinal movement parallel with the spindle axis there is tool carriage 52 which supports a cross slide 53 bodily movable with the carriage and slidably guided thereon for movement transverse to the carriage movement. Also longitudinally slidably guided on bed 50 there is a turret carriage 54 which supports a tool turret 55 for bodily movement with the carriage and index movement about a vertical axis.
The turret carriage 54, Fig. From this position the carriage has forward movement to the left, the first portion of such forward movement being at relatively fast quick traverse rate, which is changed to a feed rate as cutting tools, not shown, which are suitably fixed with the turret face then presented to the work, are about to contact the work piece.
At the completion of the forward stroke the turret is returned to the loading position at relatively rapid rate. These movements are 60 effected by a piston device , Figs. The feed and quick traverse movements of the turret carriage 54, and the control mechanism therefor have been fully described in said Patent No. The turret 55, Figs. The adjacent edges of the plates are annular and provide angular surfaces upon which portions a, b of a clamp ring , Fig.
A primary locating plunger , Fig. When the turret locating plungers , , Fig. The power indexing mechanism is as follows: SA motor , Fig. The sprocket is connected for rotatably indexing the turret 55 through a chain , another sprocket ,-a shaft , a coupling member having notch portions a, and fixed on shaft , a coupling member slidably keyed on a shaft and having tooth portions such as a adapted to engage the notches a, and a pair of meshed bevel gears , respectively fixed on the shaft and on the pivot shaft The drive from motor to and including the coupling member is carried on bed 50, while the coupling member and the remainder of the train is carried on the turret carriage.
As the turret carriage reaches the limit of its right-hand movement the coupling teeth a engage the notches a and the motor may then index the turret.
A spring provides a yielding of the coupling member sufficient to firmly seat the teeth a in the notches, the teeth and notches having complementary angular sides for such seating to prevent lost motion in the index train.
The control plunger carries configurated cam insets , , Fig. During backward movement of the turret carriage, to the right in Fig. During this movement the lower portion b of plunger is forced upwardly by a cam surface of its cam insert and thereby simultaneously forces the plunger downwardly out of engagement with its bushing, the lower plunger end being received in a cam depression a, there being for such simultaneous plunger movement a pinion simultaneously oppositely engaging suitable rack teeth on the different plungers.
Both the plungers are then disengaged since the abutment of latch c on the bottom of its bushing prevents the upper portion a of plunger from entering the bushing at this time. The turret carriage 54 reaches the limits of its backward movement, where the coupling members , , Fig. During the index movement the next bushing to be engaged by plunger passes through a position where the latch c permits entry of the plunger which then engages its bushing for locating the turret substantially in indexed position.
During the next forward movement of the turret carriage, to the left of the position shown in Fig. The upper portion a of plunger is normally sufficiently loosely fitted in its bore that it will follow downwardly when the lower portion b is forced downwardly as described. However, suitable pin and slot lost motion connections may be used for interconnecting the portions a, b to insure Sthat the portion a is forced downwardly with portion b while permitting relative movement of the portion b upwardly for compressing spring d while the latch c prevents movement of the portion a upwardly as described.
Such lost motion means is contemplated but since such expedients are well understood in the art in various forms the pin and slot connection is not shown. It will be noted that the final seating Of the Sprimary turret locating plunger , Figs.
If it is desired, during indexing, to pass over one or more turret positions the plunger , Fig. This is effected by blocking plugs, such as , which are associated with each of the various bushings for plunger The blocking plugs have a lower abutment portion a which is normally retained in upper position, as shown, by a threaded portion b engaging a suitable threaded bore, but the abutment plug may be advanced by the threads of the bore to stand in a lower position preventing entry of plunger into the bushing.
The control mechanism for effecting the multiple index movements required for passing over desired index stations will be later described. Means are provided to prevent the turret carriage 54 from moving forward, to the left in Figs. When the lever is engaged in a notch a the turret carriage may move forward but if the turret is not properly indexed, whereby the lever is not engaged, an interference portion a will be engaged by an abutment portion fixed on the carriage to prevent forward carriage movement.
The plunger , Fig. The ring portions a, b are provided with toggle links , each pivoted at the one end on the corresponding ring: portion and at the other end respectively on different eccentric portions a, b on a shaft which also has fixed thereon a gear engaging suitable rack teeth on the plunger The angular position of the eccentrics and relationship of the parts is such that as the plunger is shifted to the left, Fig.
For adjusting the clamp ring there is provided a stud fixed on the one ring portion and in threaded engagement with a nut a carried by the other ring portion. An indexible control dog drum , Figs. Referring to Figs. Suitable dog sets on drum , respectively operative in the different index positions of the drum may operate during the longitudinal movement of the turret carriage for selectively determining various machine functions to suit the operating position of the turret.
Drum is fixed on a shaft and when the turret carriage is in its turret index position, that is to say, at the extreme right, Fig. The tooth members have lost motion in the notches, for reasons later explained. When the turret 55 and control dog drum are indexed as previously described the control dog drum is correspondingly indexed through the engaged coupling members.
Suitable dog sets on drum , respectively for the different index steps of the turret 55, may operate during the index movement to select various other machine functions according to the operating position of the turret after the indexing.
The functions controlled by the dog drums , and the manner of such control for the machine of Fig. It will be understood that a cycle of machine operation includes the step-by-step indexing of the turret 55 through one revolution, whereby the dog drums and are each also indexed through one revolution, but if the nature of the work piece does not require as many turret tool sets as there are tool faces provided on the turret some of the index movements of the turret and dog drums may cause these parts to pass over some of the index positions.
The indexing is effected while the turret carriage 54 is on its extreme right position, shown in Fig. What is claimed is: 1. In a machine tool the combination of a rotatably indexible turret, a turret support, a main index plunger and a supplemental index plunger each carried by said support, said turret providing a plurality of sets of sockets respectively for the different plungers and each including a plurality of spaced sockets respectively for receiving the corresponding plunger in the different index positions of the turret, means for operating said plungers including means for the socket engagement of the main plunger to disengage the supplemental plunger and vice versa and including means releasably restraining said supplemental plunger from engagement when the main plunger is disengaged for a turret index movement, means operable to render said restraining means ineffective during said index movement whereby to effect engagement of the supplemental plunger with the next socket reached during the index movement, and means subsequently operable to engage the main plunger in its corresponding socket.
All rights reserved. A SumoBrain Solutions Company. Login Sign up. Search Expert Search Quick Search. Turret indexing mechanism. United States Patent The purpose of the invention is to Edward, Godfriaux Louis. Click for automatic bibliography generation. Figure 3 is a partial vertical section, taken approximately along line of Fig.
Figure 4 is a partial vertical section taken apa0 proximately along line of Fig. Figure 5 is an enlargement of a portion of Fig. Figure 7 is a partial horizontal section along line of Fig. Figure 8 is a partial vertical section along line of Fig. Figure 9 is a partial right end elevation of the mechanism of Fig.
Figure 10 is a partial vertical section along line of Fig.
US2358503A - Turret indexing mechanism - Google Patents
Patented Sept. Divided and this application January 23, , Serial No. Figure 2 is an enlarged plan view of 'a turret This application is a division of a copending and i s ca e, to ether with so e of the con application Serial No. I A further purpose is to provide an improved 2 Figure 9 is a partial right end elevation of the control mechanism for the transmission mechamechanism of Fig. Slidably guided on and control mechanism which incorporates fluid suitable ways on bed 50 for longitudinal moveor hydraulic operated devices in an improved ment parallelwith the spindle axis there is tool form and relationship. Also longitudinally s i ab y ierred individual purposes, and cooperatively inguided on bed 50 there isv a turret carria e 54 terconnected for effecting combination control which supports a tool turret'55 forbodily moveeffects.
Indexing in reference to motion is moving or being moved into a new position or location quickly and easily but also precisely. When indexing a machine part, its new location is known to within a few hundredths of a millimeter thousandths of an inch , or often even to within a few thousandths of a millimeter ten-thousandths of an inch , despite the fact that no elaborate measuring or layout was needed to establish that location. In reference to multi-edge cutting inserts , indexing is the process of exposing a new cutting edge for use. Indexing is a necessary kind of motion in many areas of mechanical engineering and machining.