Quick-change tool holder, especially for automatic lathes or similar machine tools

{
  "publication_number": "EP0007077A1",
  "country": "EP",
  "kind": "A1",
  "title": "Quick-change tool holder, especially for automatic lathes or similar machine tools",
  "abstract": "1. Quick-change tool holder, in particular for automatic longturning lathes or similar machines, consisting of a carrier (11) which is capable of being brought into connection with the gripping surface of the machine, and is provided with a least one dovetailed web (10), and of a U-shaped lathe tool holder (20) which takes up the lathe turnin tool and is capable of being adjusted with the aid of a dovetailed groove (21) on said dovetailed web (10) of said carrier (11), and of being locked thereto by means of a locking element, with said dovetailed web (10) of said carrier (11) being capable of being stayed in relation to said dovetailed groove (21) of said lathe tool holder (20) by means of a chucking workholding appliance (40, 50, 60) adjustable in said carrier (11) or said lathe tool holder (20) respectively, characterized in that said chucking workholding appliance (40) is aligned with its longitudinal axis vertically in relation to the longitudinal axes of said dovetailed web (10) and said dovetailed groove (21), as well as parallel in relation to said gripping surface of said carrier (11), that on one side of said dovetailed web (10) of said carrier (11) one part is recessed for serving as the threated chucking bore (33), and, that said chucking workholing appliance (40) as adjustable in said lathe tool holder (20) and designed as a lock screw, is capable of bieng adjusted and stayed directly against the wall of said threaded chucking bore (33) in said dovetailed web (10).",
  "claims": [
    "1. A quick-change steel holder, in particular for long-haul lathes or similar machines, comprising a carrier provided with at least one dovetail web and connectable to the machine, and a U-shaped turning bit holder which receives the turning bit and is adjustable by means of a dovetail groove on the dovetail web of the carrier and lockable thereto by means of a locking member and is known per se, characterised in that, the carrier is constructed as a dovetail strip (10), a bolt-like clamping element (30, 40, 50, 60) is used as the locking element, which at least partially penetrates the dovetail connection between the dovetail strip (10) and the dovetail groove (21) of the turning bit holder (20), and that the dovetail strip (10) and the dovetail groove (21) can be clamped against one another at least in a partial region by means of rotation and/or axial adjustment of the clamping element (30, 40, 50, 60).",
    "2. Quick-change steel holder according to claim 1, characterised in that the dovetail strip (10) is provided with counterbored hole receiving means (11) for countersunk head screws (12).",
    "3. Quick-change steel holder according to Claims 1 and 2, characterized in that the fastening surface of the dovetail strip (10) and the open side of the dovetail groove (21) of the turning-bit holder (20) are arranged in a common plane.",
    "4. Quick-change steel holder according to Claim 1, characterized in that the dovetail strip (10) is of smaller cross section than the dovetail groove (21) in the turning tool holder (20) or vice versa, and in that a bolt of approximately elliptical cross section is inserted between the two side faces of the dovetail strip (10) and the dovetail groove (21), which bolt runs parallel to one another at a distance from one another, as clamping element (30) in the longitudinal direction of the dovetail connection and is held and rotatable (Figure 1) between the adjacent side faces of the dovetail strip (10) and the dovetail groove (21).",
    "5. A quick-change steel holder according to claim 4, characterised in that the small axis in the elliptical cross-section of the bolt corresponds approximately to the spacing of the mutually adjoining side faces of the dovetail strip (10) and the dovetail groove (21), wherein preferably one of the side faces has a small groove (13) for fixing the bolt.",
    "6. A quick-change steel holder according to claim 1, characterised in that the dovetail strip (10) and the dovetail groove (21) have the same cross-section and are provided, at least in a region of the side faces facing one another, with mutually aligned grooves (13, 26) running in the longitudinal direction of the dovetail connection for receiving a bolt of approximately elliptical cross-section as clamping element (30), and in that the dovetail strip (10) and the dovetail groove (21) can be clamped transversely to the dovetail connection (Figure 3) by turning the clamping element (30).",
    "7. A quick-change steel holder according to claim 1, characterised in that the dovetail strip (10) includes a receptacle which is triangular in cross-section and is directed longitudinally on one side to the adjoining side face of the dovetail groove (21), in that a bolt which is approximately elliptical in cross-section is inserted into this receptacle as clamping element (30), and in that the dovetail strip (10) and the dovetail groove (21) can be clamped transversely to the dovetail connection (Figure 4) by turning the clamping element together.",
    "8. A quick-change steel holder according to claim 1, characterised in that the dovetail strip (10) has in the end face a longitudinally directed, open receptacle (15) for a bolt of approximately elliptical cross-section as clamping element (30), and in that by rotating this clamping element the dovetail strip (10) can be clamped perpendicularly to the base surface of the dovetail groove (21) (Figure 5).",
    "9. A quick-change steel holder according to claim 1, characterised in that the dovetail strip (10) is divided into two resilient halves by a longitudinal slot (18) extending from the end face, that the longitudinal slot (18) is formed with an enlargement (19) for receiving a bolt of approximately elliptical cross-section as a clamping element (30), and that by turning the clamping element (30) introduced into the enlargement (19), the halves of the dovetail strip (10) can be spread apart and are thus clamped transversely to the dovetail connection to the dovetail groove (21) (Figure 6).",
    "10. Quick-change steel holder according to claim 1, characterised in that, the dovetail strip (10) is provided with a fixing block (16), a bolt of approximately elliptical cross-section is introduced as clamping element (30) in the fastening block in a receptacle directed transversely to the dovetail connection, the clamping element (30) bears against the end face of the turning bit holder (20) outside the dovetail strip (10) and that, by turning, the clamping element (30) is clamped against the end face of the turning bit holder (20) (FIG. 7).",
    "11. Quick-change steel holder according to claim 1, characterised in that a bolt of approximately elliptical cross-section is introduced as clamping element (30) in the turning bit holder (20) in a receptacle (26) directed transversely to the dovetail connection, in that the clamping element (30) bears against the end face of the dovetail strip (30) outside the turning bit holder (20), and in that, by turning, the clamping element (30) is clamped against a fastening block (16) of the dovetail strip (10) (Figure 9).",
    "12. Quick-change steel holder according to Claim 1, characterized in that in the crossing region of the dovetail strip (10) and the dovetail groove (21) in the dovetail strip (10) or in the turning-bit holder (20), an approximately diagonal receptacle for a bolt of approximately elliptical cross section is introduced as clamping element (30), in that the clamping element (30) bears against the turning-bit holder (20) or the dovetail strip (10), and in that, during turning, the clamping element (30) clamps itself against the turning-bit holder (20) or the dovetail strip (10) (Figure 8).",
    "13. Quick-change steel holder according to claim 1, characterised in that a threaded bore (27) directed transversely to the dovetail connection is made in a side wall of the dovetail groove (21) of the turning bit holder (20), and in that a locking screw can be adjusted as clamping element (40) in this threaded bore (27), said locking screw clamping itself on the facing side surface of the dovetail strip (10) (Figure 10).",
    "14. Quick-change steel holder according to claim 13, characterised in that the dovetail strip (10) has, in the support region of the locking screw, a clamping recess (33) with a terminating wall which is perpendicular to the locking screw.",
    "15. A quick-change steel holder according to claim 1, characterised in that a part of the dovetail strip (10) or of the dovetail groove (21) is cut out, in that a clamping wedge (51 or 61) can be adjusted transversely to the dovetail connection as a clamping element (50 or 60) in the cut-out (34, 35), in that this clamping wedge (51 or 61) forms a part (52 or 64) of the side face of the dovetail strip (10) or of the dovetail groove (21) and in that the clamping wedge can be clamped against the dovetail groove (21) or the dovetail strip (10) by axial adjustment (Figures 11 to 13).",
    "16. Quick-change steel holder according to claim 15, characterised in that a cylindrical clamping wedge (51) is adjustable in a bore of reduced diameter as a recess (34, 35) by means of an adjusting screw (54) which can be screwed by means of a threaded part (57) into a threaded bore (53) of the clamping wedge (51) and is supported by means of a collar (56) on the shoulder of the bore (Figure 12).",
    "17. Quick-change steel holder according to Claim 15, characterized in that the clamping wedge (61) is designed as a slide which itself runs out into a set screw (63) or the like and can be adjusted axially by means of an adjusting nut (Figure 13).",
    "18. Quick-change steel holder according to one of Claims 1 to 17, characterized in that the operating end of the clamping element (30, 40, 50, 60) is provided with an internal or external hexagon (32), a screw slot, a screw head (42), a threaded part (61) or the like."
  ],
  "description_excerpt": "The invention relates to a quick-change steel holder, in particular for automatic lathes or similar machines, which consists of a carrier provided with at least one dovetail web and connectable to the machine, and a U-shaped turning bit holder which receives the turning bit and is displaceable by means of a dovetail groove on the dovetail web of the carrier and lockable thereto by means of a locking member and is known per se. The known quick-change steel holders of this type are very complicated and require a large space so that they cannot be used especially in long lathes or similar machines with a plurality of closely adjacent machining stations. The large space requirement in the known quick-change steel holders arises from the locking member which is installed in the carrier and is usually designed as an adjustable slide and which can be adjusted in the carrier by means of an eccentric or a toothed adjusting drive. For this reason, in the case of long-haul automatic machines or similar machines, almost exclusively normal steel holders are used which are fixedly connected to the machine. For reabrasion of the turning chisels, the turning chisel must be released from the steel holder. This is laborious and requires readjustment when the turning bit is replaced. The setup times during the changing or re-grinding of the turning chisels are therefore very long, which adversely affects the economics of the machine.",
  "cpc": [
    "B23B 29/246"
  ],
  "assignees": [
    "STUBER ERWIN"
  ],
  "filing_date": "1979-07-06",
  "publication_date": "1980-01-23",
  "priority_date": "1978-07-17",
  "application_number": "EP-79102307-A",
  "family_id": "6044603",
  "citations": [
    "AT213193B",
    "DE1834308U",
    "DE1963234U",
    "DE7821384U1",
    "FR1025799A",
    "FR852279A",
    "US3157078A",
    "US3280673A"
  ]
}