MOUNTING DEVICE FOR MACHINING TOOLS

Abstract: A mounting device for machining tools, preferably milling cutters, which are secured to the mounting device (11, 30) by means of a connecting means (12). For making possible a rapid exchange of machining tools (10), such as milling cutters having different diameters and entering angles, the mounting device comprises an adapter (11, 30) which is attached to a drive spindle (13) and carries the machining tool (10), and an operating means (15; 31, 41), arranged in the adapter (11, 30) and manually shiftable between a blocking position and a releasing position. In its blocking position the operating means (15; 31; 41) actuates a blocking means (19; 33; 38) to engage the machining tool (10) for carrying same when the connecting means (12) is loosened. In its releasing position the operating means (15; 31; 41) allows removal of the machining tool (10) from the adapter (11, 30).

Description: MOUNTING DEVICE FOR MACHINING TOOLS The present invention relates to a mounting device for machi¬ ning tools, such as milling cutters, which are adapted to " be secured to the mounting device by means of a connecting means, such as a screw joint. In industry the demand for a more rapid and simplified ex¬ change of machining tools has become great during the latest years. Particularly in milling cutters having downwards or sidewards directed mounting devices problems arise as to the exchange of tools, because the milling cutter which s to be connected or disconnected has to be held in mounting posi¬ tion by the one hand, while simultaneously the connecting means, usually one or several screws, are attached or detached by the other hand. The object of the present invention is to solve this mounting problem. This is attained by means of a locking device, which is arranged in an adapter attached to a drive spindle and carrying the milling cutter, and which retains the milling cutter in its mounting position, without, however, clamping same, while the connecting means is attached or detached. This means that the handsof the operator are free to work with the connecting means. IPO The above and other objects of the invention are attained by giving the invention the characterizing features stated in the claims following hereinafter. .. .».- The invention is described in detail in the following descrip tion with reference to the accompanying drawings. It is to be understood that the various embodiments illustrated therein are only shown by way of example and that various modificatio thereof may be made within the scope of the claims. In the drawings, Pig. 1 shows in section a mounting device according to the invention in form of an adapter having a locking device. Pig. 2 shows in section another embodiment of a mounting de¬ vice according to the invention. Pig. 3 shows diagrammatically a third embodiment of a mountin device according to the invention. Pig. 4 is a section taken on the line IV-IV in Pig. 3. Pig. 5 shows a detail in Pig. 3 in a larger scale. In the illustrated embodiments the machining tool is shown in form of a milling cutter 10. In Pig. 1, the milling cutter 10 is secured to a mounting device in form of an adapter 11 by means of a central screw 12. The adapter 11 in its turn is se red to a spindle nose 13 by means of screws, not shown. According to the invention, a locking device is provided whic comprises an operating means in form of a bar 15 and a blocki means, which in the embodiment according to Pig. 1 is a ball 19. Transmitting means in form of two balls 17, 18 are posi¬ tioned between the bar 15 and the ball 19. The bar 15 is po¬ sitioned in a bore 20 in the adapter 11, preferably in the vicinity of or at the rotational axis of the spindle 13 » and is shiftable between the position 15a shown by full lines which is the blocking position, and the position 15b shown by chain-dotted lines which is the releasing position. These positions are defined by a lock screw 14, which projects into a groove 16 in the bar 15. In the underneath side of the bar 15 there is provided cam means in form of a shallow recess 21 which turns into a deeper recess 22; said recesses being adap¬ ted to cooperate with the ball 17. The balls 17, 18, 19 are positioned in a bore 25 which is in connection with ' the bore 20 perpendicular thereto. In the po¬ sition shown in Pig. 1 the ball 19 projects into a recess 27 in the milling cutter 10 through a recess or opening 26 in the envelope su ace of the centering plug 30 of the adapter 11. The ball 19 is retained in this position by means of the balls 17, 18 due to the fact that the ball 17 abuts the bottom of the shallow recess 21 in the bar 15. In this position the ball 19 locks the milling cutter 10 so that the latter cannot be removed from the centering plug 30 even if the screw 12 is loosened. When UB milling cutter 10 is to be disconnected from the moun¬ ting device the bar 15 is shifted to its blocking position 15a. Then the screw 12 is undone which causes the weight of the milling cutter to be transmitted to and carried by the ball 19. When the screw 12 is undone and removed the operator takes the milling cutter 12 with his both hands, and pushes at the same time the right end of the bar 15 so that the bar is shifted to its releasing position 15b, to the left in Pig. 1. In this position the recess 22 is straight in front of the ball 17 so that the balls 17, 18 are free to be pushed up¬ wards by the ball 19. Due to the curved outer contour on the ball 19 and a cooperating inclined upper wall of the recess 27, the ball 19 then is pushed radially inwards, thereby re¬ leasing the milling cutter 10 so that the latter can be de¬ tached from the adapter 11. In the embodiment shown in Pig. 2 only one end of the bar 15 projects out of the adapter 11, while the other end rests against a spring 32 which is accomodated in the bore 20. Due to the spring action the bar 15 is permanently held in its blocking position shown in Pig. 2. This means that there is no risk that the bar 15 is unintentially left in its non- blocking position 15b in Pig. 1, in which case the milling cutter 10 would fall down on an underlying object, for exampl the workpiece, when the screw 12 is undone. In Pig. 2 an alternative embodiment is shown of the trans¬ mitting means between the bar 15 and the blocking means as well as of the blocking means itself. In the embodiment accor ing to Pig. 1 these members are three balls which in Pig. 2 are replaced by two pins 33, 34 which are longitudinally mova due to mutual wedge action and which have the same function as the balls in Pig. 1. In Pigs. 3-5 a third embodiment of the mounting device is dia grammatically shown. Pig. 3 illustrates the centering plug 30 of the adapter 11, the bar 41 and a lockirg device comprising shaft 35 and an eccentric disk 38. The bar 41 is provided wit teeth 36 which mesh with teeth 37 on the shaft 35, thereby forming a rack and pinion transmission. The disk 38, which is attached to the shaft 35, is accomodated in a pocket 39 in th adapter 11 when the bar 41 is in its releasing position. In the blocking position of the bar 41 the disk 38 projects into a recess 40 in the milling cutter 10. The disk 38 is rotated between its two positions over the rack and pinion transmissi 36, 37 by moving the bar 41.

Claims: 1. A mounting device for machining tools, such as milling cutters, which are adapted to be secured to the mounting de¬ vice by means of a connecting means, such as a screw joint, c h a r a c t e r i z e d in that the mounting device com¬ prises an adapter (11, 30) which, in use, is attached to a drive spindle (13) and carries the machining tool (10), and in that the adapter (11, 30) is provided with a locking de¬ vice (15, 17, 18, 19; 31, 33, 34; 41, 35, 38), which com¬ prises a shiftable operating means (15; 31; 41), said ope¬ rating means in a first blocking position being adapted to move a blocking means (19; 33; 38) radially, preferably ra¬ dially outwards, relative to the rotational axis of the machining tool (10) to engagement with the machining tool (10) and carrying thereof when the connecting means (12) is loosened, and said operating means in a second position be¬ ing adapted to allow removal of the machining tool (10) from the adapter (11 , 30). 2. A mounting device according to claim 1, wherein the ope¬ rating means (15; 31 ∑ 41) is manually shiftable by means of the same hand or hands, which carry the machining tool (10). 3. A mounting device according to claim 2, wherein the ope¬ rating means (15) is shiftable to its blocking position by means of one hand, and to a releasing position by means of the other hand. 4. A mounting device according to any of claims1-3, wherein the operating means consists of a bar (15; 31), which is movable in a bore (20) in the adapter (11, 30) and which is associated with a cam means (21, 22), said cam means being adapted to move the blocking means (19; 33) over transmitting means (17, 18; 34) to engagement with the machining tool (10) when said bar is in its blocking position. 5. A mounting device according to claim 4, wherein the transmitting means comprises a plurality of balls (17, 18), said balls being positioned in a row in a second bore (25) in the adapter (11, 30), said bore being perpendicular to the bar (15) and provided with a lateral opening (26), and wherei the machining tool (10) is provided with a recess (27) in alignment with said opening, and the blocking means is a" further ball (19) positioned remotest from the bar (15); the device being so designed that said remotest positioned ball in the blocking position of the bar (1 ) is forced radially outwardly by means of the balls lying behind and is fixedly maintained in said opening and recess, thereby preventing the machining tool (10) from being removed from the adapter (11, 30) when the connecting means (12) is loosened. 6. A mounting device according to claim 4 or 5, wherein the bar (31) is yieldingly biassed in its blocking position by means of spring means (32), and is manually movable against the action of said spring means for releasing the machining tool (10). 7. A mounting device according to claim 4, wherein the transmitting means and the blocking means consist of two mu¬ tually substantially perpendicular pins (34, 33), which are • movable under mutual wedge action. 8. A mounting device according to any of claims 4-7, wherein the cam means (21, 22) comprises a lateral recess (22) in the bar (15; 31), said recess being adapted to receive the trans¬ mitting means (17, 18; 34) in the releasing position of said bar, and wherein the blocking means (19; 33) and the machinin tool (10) are provided with complementary cam surfaces which are adapted to move the blocking means (19; 33) radially in¬ wards when the machining tool (10) is removed from the mounti device (11, 30), thereby moving the transmitting means (17, 1 34) into the recess (22) in said bar. the operating means consists of a bar (41), which is movable in a bore (20) in the adapter (11, 30), and wherein the blocking means consists of a rotatable eccentric disk (38), which is adapted to be actuated by said bar over a gear transmission (36, 37). 10. A mounting device according to claim 9, wherein the gear transmission comprises a gear wheel (37) which meshes with a rack (36) on the bar (41), said gear wheel being attached to a shaft (35) which carries the eccentric disk (38).

Inventors: ANDERSON K
Applicants: ANDERSON K, SANDVIK AB
Application year: 1979
Main classification: B23Q3
IPC codes: B23B31, B23C5, B23Q3