A power head for slotting or gear cutting

Abstract

The application relates to the field of mechanical processing, in particular to a power head for slotting or gear shaping. The power head comprises a tool holder, a tool rest, a tool shaft and a driving shaft. The tool rest is located in the tool holder and can move along the feeding direction and the withdrawing direction of the power head. The tool shaft is pivoted to the tool rest through a pivot joint and can swing around the pivot joint. The driving shaft is rotationally arranged on the tool holder. The input end of the driving shaft can be connected to a driving source. The transmission mechanism for driving the tool rest to move is arranged between the output end of the driving shaft and the tool rest. The control mechanism for controlling the swing angle of the tool shaft is arranged between the output end of the driving shaft and the tool shaft. The power head can reduce the risk of damaging the workpiece machining surface caused by the tool during withdrawing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machining, in particular to a power head for slotting or gear shaping. BACKGROUND

[0002] The power head, also known as a tool holder, is usually installed on a power tool tower and driven by a motor, and is applied to machining equipment such as turning and milling combined machines and machining centers, and is used for machining parts that need to be gear shaped, spline shaped or slotted. The tool on the slotting tool holder makes high-speed reciprocating stroke movement to cut the workpiece, thereby completing gear shaping, spline shaping or slotting.

[0003] After completing the machining process, the tool needs to be retracted so that the workpiece can be removed from the clamp. The traditional tool feeding and retracting method is straight feeding and straight retracting, which is easy to scratch the surface of the workpiece. How to reduce the scratching of the workpiece during retraction has become a problem that needs to be solved urgently. SUMMARY

[0004] In order to reduce the damage caused by the tool to the workpiece during machining, the present application provides a power head for slotting or gear shaping.

[0005] The power head for slotting or gear shaping provided by the present application adopts the following technical solution:

[0006] A power head for slotting or gear shaping, the power head comprising

[0007] a tool holder;

[0008] a tool holder;

[0009] a tool holder;

[0010] a drive shaft, the drive shaft being rotatably arranged on the tool holder, the input end of the drive shaft being capable of being connected to a driving source, a transmission mechanism for driving the tool holder to move being arranged between the output end of the drive shaft and the tool holder, and a control mechanism for controlling the swing angle of the tool shaft being arranged between the output end of the drive shaft and the tool shaft.

[0011] By adopting the technical scheme, the cutter is installed on the cutter shaft, the driving source drives the driving shaft to rotate, the driving shaft drives the cutter holder to move along the feed direction and the retreat direction of the power head through the transmission mechanism; when the power head is in the feed state, the control mechanism makes the cutter shaft in the non-swing state, that is, the axis of the cutter shaft is parallel to the feed direction of the power head, the cutter holder moves towards the machining surface of the workpiece, and the machining surface of the workpiece is cut by the cutter on the cutter shaft; when the power head is in the retreat state, the driving shaft drives the cutter holder to move along the retreat direction through the transmission mechanism, and the control mechanism makes the cutter shaft swing around the pivot shaft by a predetermined angle, so that the cutter on the cutter shaft is deflected towards the direction away from the machining surface of the workpiece to realize the retreat of the cutter, and the risk of damage to the machining surface of the workpiece by the cutter during the retreat is reduced.

[0012] Preferably, the transmission mechanism comprises a mounting column eccentrically arranged on the output end of the driving shaft, a roller one is arranged on the mounting column, the cutter holder is provided with a strip-shaped hole one matched with the roller one, and the inner wall of the strip-shaped hole one comprises a feed segment one and a return segment one; when the power head is in the feed state, the roller one is in abutment with the feed segment one; when the power head is in the retreat state, the roller one is in abutment with the return segment one, and the roller one can convert the rotation of the driving shaft into the reciprocating movement of the cutter holder by sliding in the strip-shaped hole one.

[0013] By adopting the technical scheme, the driving shaft rotates to drive the mounting column to eccentrically rotate, and the roller one slides in the strip-shaped hole one while eccentrically rotating with the mounting column relative to the axis of the driving shaft; when the roller one is in abutment with the feed segment one, the cutter holder can be pushed to move to realize the feed; when the roller one is in abutment with the return segment one, the cutter holder can be pushed to move to realize the retreat.

[0014] Preferably, the control mechanism comprises a transmission seat located in the cutter seat and capable of moving along a direction parallel to the moving direction of the cutter holder, the transmission seat is provided with a pulling piece and a pushing piece matched with the cutter shaft; when the transmission seat is relatively far away from the cutter shaft, the pulling piece can pull the cutter shaft to make the axis of the cutter shaft parallel to the moving direction of the cutter holder; when the transmission seat is relatively close to the cutter shaft, the pushing piece can push the cutter shaft to swing.

[0015] By adopting the technical scheme, when the power head needs to feed, the transmission seat is relatively far away from the cutter shaft, the cutter shaft is pulled by the pulling piece to make the axis of the cutter shaft parallel to the moving direction of the cutter holder; when the power head needs to retreat, the transmission seat is relatively close to the cutter shaft, the cutter shaft is pushed to swing by the pushing piece, and the cutter on the cutter shaft is away from the machining surface of the workpiece.

[0016] Preferably, a roller two is arranged on the mounting column, the transmission seat is provided with a strip-shaped hole two matched with the roller two, the inner wall of the strip-shaped hole two comprises a feed segment two, a transition segment and a return segment two; when the power head is in the feed state, the roller two is in abutment with the feed segment two; when the power head is in the retreat state, the roller two is in abutment with the transition segment first and then in abutment with the return segment two.

[0017] By adopting the technical scheme, when the power head ends the feeding and is switched to the retracting state, the roller one contacts the return section one of the strip-shaped hole one to drive the tool holder to return, and at this time, the roller two contacts the transition section of the strip-shaped hole two and does not contact the return section two, so that the transmission seat is not immediately returned, the transmission seat is relatively close to the tool holder, and thus the pushing piece can push the tool shaft to swing to realize the tool retracting.

[0018] Preferably, the tool holder is provided with an elastic piece, which can directly or indirectly apply an elastic force close to the tool holder to the transmission seat.

[0019] By adopting the technical scheme, when the power head is in the feeding state, the roller one abuts against the feeding section one of the strip-shaped hole one, and the roller two can abut against the feeding section two of the strip-shaped hole two under the elastic force of the elastic piece, so that even if the part precision has an error, the elastic deformation of the elastic piece can compensate for the error, the interference between the roller one and the roller two is avoided, and the precision requirement of the part is reduced; when the power head is in the retracting state, the roller one contacts the return section one of the strip-shaped hole one, and the strip-shaped hole two is provided with the transition section, so that the transmission seat contacts the roller two under the action of the elastic piece, the roller two is separated from the return section two, and thus the transmission seat is relatively close to the tool holder.

[0020] Preferably, the pulling piece includes a plurality of wedge-shaped blocks one arranged at one end of the transmission seat close to the tool shaft, the one end of the tool shaft close to the transmission seat is provided with wedge-shaped blocks two corresponding to the wedge-shaped blocks one, the wedge-shaped blocks two are at least two and are symmetrically distributed about the axis of the tool shaft, and the wedge-shaped blocks one can abut against the wedge-shaped blocks two when the transmission seat moves away from the tool shaft.

[0021] By adopting the technical scheme, when the transmission seat moves away from the tool shaft, the wedge-shaped blocks one on the transmission seat can abut against the wedge-shaped blocks two on the tool shaft, and thus the tool shaft can be pulled to be parallel to the moving direction of the tool holder to prepare for the feeding; when the transmission seat moves towards the tool shaft, the wedge-shaped blocks one on the transmission seat are separated from the wedge-shaped blocks two on the tool shaft, and thus the tool shaft is in a state of being able to swing about the pivot shaft to prepare for the pushing piece to push the tool shaft to swing to retract the tool.

[0022] Preferably, the pushing piece includes a push rod directly or indirectly connected with the transmission seat, and the tool shaft has an abutting piece capable of abutting against the push rod, and the push rod can push the abutting piece to make the tool shaft swing when the transmission seat moves towards the tool shaft.

[0023] By adopting the technical scheme, when the power head retreats the tool, the transmission seat moves towards the tool shaft direction, the wedge-shaped block one on the transmission seat and the wedge-shaped block two on the tool shaft are separated, so that the tool shaft is in a state capable of swinging around the pivot shaft, and the push rod on the transmission seat pushes the abutting member on the tool shaft, so that the tool shaft swings to retreat the tool.

[0024] Preferably, the tool shaft is provided with two threaded through holes parallel to the axis of the tool shaft and symmetrically distributed about the axis of the tool shaft, the abutting member is two and threadedly connected with the threaded through holes, and the push rod is two and corresponds to the two abutting members one by one.

[0025] By adopting the technical scheme, when the power head retreats the tool, the transmission seat moves towards the tool shaft direction, the wedge-shaped block one on the transmission seat and the wedge-shaped block two on the tool shaft are separated, so that the tool shaft is in a state capable of swinging around the pivot shaft, and the push rod on the transmission seat pushes the abutting member on the tool shaft, so that the tool shaft swings to retreat the tool. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a sectional view of the power head.

[0027] Figure 2 is a schematic view of the internal structure of the power head.

[0028] Figure 3 is a sectional view of the A-A line of Figure 2 .

[0029] Figure 4 is a sectional view of the B-B line of Figure 2 .

[0030] BRIEF DESCRIPTION OF DRAWINGS: 1, tool seat; 2, tool holder; 3, tool shaft; 4, inner cavity; 5, tool hole; 6, sliding sleeve; 7, tool disc; 8, elastic ring; 9, circular boss; 10, lug; 11, pivot; 12, drive shaft; 13, bearing; 14, transmission mechanism; 15, mounting column; 16, roller one; 17, strip-shaped hole one; 18, advance section one; 19, return section one; 20, control mechanism; 21, transmission seat; 22, roller two; 23, strip-shaped hole two; 24, advance section two; 25, transition section; 26, return section two; 27, pulling member; 28, pushing member; 29, mounting cavity; 30, elastic member; 31, bolt; 32, wedge-shaped block one; 33, wedge-shaped block two; 34, circular hole; 35, push rod; 36, abutting member; 37, connecting rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings Figures 1-4This application will be described in further detail.

[0032] This application discloses a power head for slots or teeth.

[0033] For ease of description, the direction of the power head's feed is defined as "forward" and the direction of the power head's retraction is defined as "backward," but this is not intended to limit the specific orientation of each component.

[0034] like Figure 1 As shown, this power head includes a tool holder 1, a tool post 2, and a tool shaft 3.

[0035] Specifically, the tool holder 1 has an inner cavity 4, and the front end of the tool holder 1 has a tool hole 5 that communicates with the inner cavity 4. The inner cavity 4 has a sliding sleeve 6 that slides with the tool hole 5. The tool shaft 3 is located inside the sliding sleeve 6. The front end of the tool shaft 3 is connected to a tool disc 7. The tool disc 7 has a tool groove for installing the tool. An elastic ring 8 is provided between the outer wall of the front end of the tool shaft 3 and the inner wall of the sliding sleeve 6.

[0036] like Figure 1 , Figure 2 As shown, the tool holder 2 is located in the inner cavity 4 and can move along the feed direction and retraction direction of the power head.

[0037] Specifically, the front end of the tool holder 2 has a circular boss 9 that is inserted into the sliding sleeve 6. Lugs 10 are spaced apart on the circular boss 9, and a pivot hole 1 is opened on the lugs 10. A pivot hole 2 is opened on the tool shaft 3 that is aligned with the pivot hole 1. A pivot member 11 is inserted into the pivot hole 1 and the pivot hole 2, so that the tool shaft 3 can swing around the pivot member 11. The pivot member 11 can be a pivot shaft or the like.

[0038] like Figure 1 As shown, this power head also includes a drive shaft 12.

[0039] Specifically, the tool holder 1 has a mounting hole that communicates with the inner cavity 4, and the drive shaft 12 is rotatably mounted in the mounting hole.

[0040] In this embodiment, a bearing 13 is installed in the mounting hole, and the drive shaft 12 is connected to the inner ring of the bearing 13. Alternatively, a bushing that rotatably engages with the drive shaft 12 can be installed on the tool holder 1, which also achieves the installation of the drive shaft 12. The input end of the drive shaft 12 can be connected to a drive source, which can be a motor. The motor can be directly connected to the input end of the drive shaft 12, or the motor can be connected to the input end of the drive shaft 12 through other transmission components such as gear assemblies or pulley assemblies.

[0041] like Figure 1 , Figure 3 As shown, a transmission mechanism 14 for moving the tool holder 2 is provided between the output end of the drive shaft 12 and the tool holder 2.

[0042] In the embodiment, the transmission mechanism 14 comprises a mounting column 15 eccentrically arranged on the output end of the driving shaft 12, and a roller I 16 arranged on the mounting column 15.

[0043] Specifically, the output end of the driving shaft 12 is provided with a threaded hole, the mounting column 15 is provided with an external thread matched with the threaded hole, and the roller I 16 is rotationally arranged on the mounting column 15. As another solution, the mounting column 15 can be rotationally arranged on the output end of the driving shaft 12, and the roller I 16 is coaxially fixed on the mounting column 15.

[0044] As shown in Figure 1 , Figure 3 , the tool holder 2 is provided with a strip-shaped hole I 17 matched with the roller I 16, and the inner wall of the strip-shaped hole I 17 comprises an advancing section I 18 and a return section I 19. When the power head is in the feeding state, the roller I 16 abuts against the advancing section I 18; when the power head is in the retracting state, the roller I 16 abuts against the return section I 19. The roller I 16 can convert the rotation of the driving shaft 12 into the reciprocating movement of the tool holder 2 by sliding in the strip-shaped hole I 17.

[0045] In the embodiment, the length direction of the strip-shaped hole I 17 is perpendicular to the feeding direction of the power head. As another solution, the transmission mechanism 14 can comprise a cam and a roller. The cam is coaxially fixed on the output end of the driving shaft 12, the outer contour of the cam is provided with a cam groove, the tool holder 2 is provided with a connecting rod, and the roller is rotationally arranged on the connecting rod and matched with the cam groove. When the driving shaft 12 drives the cam to rotate, the tool holder 2 can be driven to reciprocate.

[0046] As shown in Figure 1 , Figure 4 , the output end of the driving shaft 12 and the tool shaft 3 are provided with a control mechanism 20 for controlling the swing angle of the tool shaft 3.

[0047] In the embodiment, the control mechanism 20 comprises a transmission seat 21 located in the tool holder 1, and the transmission seat 21 can move along a direction parallel to the moving direction of the tool holder 2.

[0048] Specifically, the mounting column 15 is provided with a roller II 22, and the transmission seat 21 is provided with a strip-shaped hole II 23 matched with the roller II 22. The inner wall of the strip-shaped hole II 23 comprises an advancing section II 24, a transition section 25 and a return section II 26. When the power head is in the feeding state, the roller II 22 abuts against the advancing section II 24; when the power head is in the retracting state, the roller II 22 first abuts against the transition section 25 and then abuts against the return section II 26.

[0049] Similarly, in this embodiment, the mounting post 15 is fixed to the output end of the drive shaft 12, and the second roller 22 is rotatably mounted on the mounting post 15. Alternatively, the mounting post 15 can be rotatably mounted on the output end of the drive shaft 12, while the second roller 22 is fixed on the drive shaft 12.

[0050] As another option, the cooperation between roller 22 and transmission seat 21 can also be designed as a cam and a roller. The cam is coaxially fixed to the output end of the drive shaft 12. The outer contour of the cam has a cam groove. The transmission seat 21 is provided with a connecting rod. The roller is rotatably mounted on the connecting rod and cooperates with the cam groove. When the drive shaft 12 drives the cam to rotate, it can drive the transmission seat 21 to move back and forth.

[0051] In this embodiment, roller 16 and roller 22 are preferably designed as a single unit. Alternatively, they can be designed as separate units.

[0052] In this embodiment, the outer diameter of roller 16 is larger than that of roller 22, the outline of the second slot 23 is similar to that of the first slot 17, and the transition section 25 is located between the second process section 24 and the second return section 26. When the power head starts to retract, roller 22 will move from the second process section 24 to the transition section 25. Therefore, the transition section 25 has a clearance space to ensure that roller 22 contacts the transition section 25 and does not contact the second return section 26 when the retraction begins.

[0053] like Figure 1 , Figure 4 As shown, the transmission seat 21 is provided with a pulling member 27 and a pushing member 28 that cooperate with the cutter shaft 3. When the transmission seat 21 is relatively far away from the cutter shaft 3, the pulling member 27 can pull the cutter shaft 3 so that the axis of the cutter shaft 3 is parallel to the moving direction of the tool holder 2. When the transmission seat 21 is relatively close to the cutter shaft 3, the pushing member 28 can push the cutter shaft 3 to swing.

[0054] Specifically, the tool holder 2 has a mounting cavity 29, and the transmission seat 21 is movably disposed within the mounting cavity 29.

[0055] The tool holder 2 is provided with an elastic element 30, which can directly or indirectly apply a spring force close to the tool holder 2 to the transmission seat 21.

[0056] In this embodiment, the rear end of the tool holder 2 is provided with a through hole that communicates with the mounting cavity 29, and the rear end of the transmission seat 21 is provided with a fixing hole that is aligned with the through hole. Bolts 31 are inserted into both the fixing hole and the through hole. The threaded section of the bolt 31 mates with the fixing hole, and the head of the bolt 31 extends to the rear of the tool holder 2. The elastic element 30 includes a compression spring disposed between the rear end of the tool holder 2 and the head of the bolt 31.

[0057] As another solution, the elastic member 30 can also be designed as a tension spring arranged in the mounting cavity 29, the front end of the tension spring is connected with the rear end of the transmission seat 21, and the rear end of the tension spring is fixed on the inner wall of the mounting cavity 29, and the elastic force of the tension spring is applied to the transmission seat 21 to move close to the tool holder 2.

[0058] As shown in Figure 1 , Figure 4 The pulling member 27 includes a plurality of wedge-shaped blocks one 32 arranged at the end of the transmission seat 21 close to the tool shaft 3, in the embodiment, the wedge-shaped blocks one 32 are symmetrically distributed about the center line of the pulling member 27, and the end of the tool shaft 3 close to the transmission seat 21 is provided with wedge-shaped blocks two 33 corresponding to the wedge-shaped blocks one 32.

[0059] The wedge-shaped blocks two 33 are at least two and symmetrically distributed about the axis of the tool shaft 3, and the wedge-shaped blocks one 32 can abut against the wedge-shaped blocks two 33 when the transmission seat 21 moves away from the tool shaft 3.

[0060] The wedge-shaped blocks one 32 are arranged at intervals, and the wedge-shaped blocks two 33 are arranged at intervals, and when mounted, the pulling member 27 and the tool shaft 3 can be relatively rotated by a certain angle, so that the wedge-shaped blocks one 32 can pass through the gap between the wedge-shaped blocks two 33, and then the pulling member 27 and the tool shaft 3 are relatively rotated by a certain angle, so that the wedge-shaped blocks one 32 can abut against the wedge-shaped blocks two 33.

[0061] As a preferred solution, a circular hole 34 is formed in the front end of the tool holder 2 and communicates with the mounting cavity 29, and the wedge-shaped blocks one 32 and the wedge-shaped blocks two 33 are located in the circular hole 34. In the embodiment, the wedge-shaped blocks one 32 are located at the periphery of the wedge-shaped blocks two 33, and as another solution, the wedge-shaped blocks one 32 are located on the inner side of the wedge-shaped blocks two 33.

[0062] It should be noted that the pulling member 27 and the transmission seat 21 in the embodiment are designed as a split type and are connected by screws. As another solution, the pulling member 27 can also be designed as an integral type with the transmission seat 21.

[0063] As shown in Figure 1 , Figure 4 The pushing member 28 includes a push rod 35 directly or indirectly connected with the transmission seat 21, and the tool shaft 3 has an abutting member 36 capable of abutting against the push rod 35, and when the transmission seat 21 moves close to the tool shaft 3, the push rod 35 can push the abutting member 36 to make the tool shaft 3 swing.

[0064] In the embodiment, the push rod 35 is indirectly connected with the transmission seat 21, specifically, a through hole is formed in the pulling member 27 along the radial direction of the pulling member 27, a connecting rod 37 is arranged in the through hole, the tool holder 2 is provided with a receiving hole for receiving the push rod 35, and the rear end of the push rod 35 is connected with both ends of the connecting rod 37 through the receiving hole, a connecting hole is formed on the connecting rod 37, and the rear end of the push rod 35 has a connecting portion connected with the connecting hole.

[0065] For the abutment 36, in the embodiment, the tool shaft 3 is provided with two threaded holes parallel to the axis of the tool shaft 3 and symmetrically distributed about the axis of the tool shaft 3, the abutment 36 has two and is threadedly connected with the threaded holes, and the push rod 35 has two and corresponds to the two abutments 36 one by one.

[0066] In the embodiment, the abutment 36 is designed as a bolt 31, the head of the bolt 31 faces the cutter head 7, and the bolt 31 is conveniently rotated to adjust the tool relief direction.

[0067] It should be noted that, in the embodiment, in order to realize the machining of the inner and outer teeth and the groove and the tool relief, two groups of push rods 35 and abutments 36 are designed, in actual application, if only one-way tool relief is required without adjustment, only one group of push rods 35 and abutments 36 can be designed, or according to actual needs, a corresponding number of push rods 35 and abutments 36 can be designed.

[0068] The working principle of the application is as follows: the driving shaft 12 is connected with the driving source, the driving shaft 12 is rotated by the driving source, the driving shaft 12 rotates to drive the eccentric rotation of the roller one 16 and the roller two 22 at the output end of the driving shaft 12, the roller one 16 drives the reciprocating movement of the tool holder 2 to realize the feed and the retreat; the roller two 22 rotates to drive the reciprocating movement of the transmission seat 21, when feeding, the transmission seat 21 and the tool shaft 3 are relatively far away, so that the wedge block one 32 and the wedge block two 33 are tightly abutted, and the tool shaft 3 is in an undeviated state; initially, when retreating, the roller one 16 contacts the return section one 19 of the strip-shaped hole one 17, the tool holder 2 starts to return, under the action of the elastic member 30, the roller two 22 contacts the transition section 25 of the strip-shaped hole two 23, and then contacts the return section two 26, the return of the transmission seat 21 is later than that of the tool holder 2, so that the transmission seat 21 and the tool holder 2 are relatively close, the wedge block one 32 and the wedge block two 33 are loosened, the push rod 35 pushes the abutment 36, and the tool shaft 3 swings to the other side to realize the tool relief.

[0069] The above are the preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application shall be covered within the protection scope of the application.

Claims

1. A power head for slotting or gear cutting, characterised in that, The power head comprises a tool holder (1); a tool holder (2) located in the tool holder (1), and the tool holder (2) is movable in the feed direction and the retreat direction of the power head; a tool shaft (3) pivoted to the tool holder (2) through a pivot (11), and the tool shaft (3) is swingable about the pivot (11); a driving shaft (12) rotatably arranged on the tool holder (1), an input end of the driving shaft (12) is connectable to a driving source, a transmission mechanism (14) for moving the tool holder (2) is arranged between an output end of the driving shaft (12) and the tool holder (2), and a control mechanism (20) for controlling the swing angle of the tool shaft (3) is arranged between the output end of the driving shaft (12) and the tool shaft (3); the transmission mechanism (14) comprises a mounting column (15) eccentrically arranged on the output end of the driving shaft (12), a roller (16) is arranged on the mounting column (15), the tool holder (2) is provided with a strip-shaped hole (17) matched with the roller (16), the inner wall of the strip-shaped hole (17) comprises a feed section (18) and a return section (19), when the power head is in the feed state, the roller (16) abuts against the feed section (18); when the power head is in the retreat state, the roller (16) abuts against the return section (19), and the roller (16) can convert the rotation of the driving shaft (12) into the reciprocating movement of the tool holder (2) by sliding in the strip-shaped hole (17); the control mechanism (20) comprises a transmission seat (21) located in the tool holder (1), the transmission seat (21) is movable in a direction parallel to the movement direction of the tool holder (2), the transmission seat (21) is provided with a pulling member (27) and a pushing member (28) matched with the tool shaft (3), when the transmission seat (21) is relatively far away from the tool shaft (3), the pulling member (27) can pull the tool shaft (3) to make the axis of the tool shaft (3) parallel to the movement direction of the tool holder (2); when the transmission seat (21) is relatively close to the tool shaft (3), the pushing member (28) can push the tool shaft (3) to swing; a roller (22) is arranged on the mounting column (15), the transmission seat (21) is provided with a strip-shaped hole (23) matched with the roller (22), the inner wall of the strip-shaped hole (23) comprises a feed section (24), a transition section (25) and a return section (26), when the power head is in the feed state, the roller (22) abuts against the feed section (24), when the power head is in the retreat state, the roller (22) abuts against the transition section (25) first and then abuts against the return section (26); the pulling member (27) comprises a plurality of wedge-shaped blocks (32) arranged on the end of the transmission seat (21) close to the tool shaft (3), the end of the tool shaft (3) close to the transmission seat (21) is provided with wedge-shaped blocks (33) corresponding to the wedge-shaped blocks (32), the wedge-shaped blocks (33) are at least two and symmetrically distributed about the axis of the tool shaft (3), when the transmission seat (21) moves away from the tool shaft (3), the wedge-shaped blocks (32) can abut against the wedge-shaped blocks (33); The pushing member (28) comprises a pushing rod (35) connected with the transmission seat (21) directly or indirectly, the cutter shaft (3) is provided with an abutting member (36) capable of abutting with the pushing rod (35), and the pushing rod (35) can push the abutting member (36) to make the cutter shaft (3) swing when the transmission seat (21) moves towards the cutter shaft (3).

2. A power head for slotting or gear cutting according to claim 1 characterised in that, The tool holder (2) is provided with an elastic member (30) capable of directly or indirectly applying an elastic force to the transmission seat (21) to make the transmission seat (21) close to the tool holder (2).

3. A power head for slotting or gear cutting according to claim 1, characterised in that, The cutter shaft (3) is provided with two threaded through holes parallel to the axis of the cutter shaft (3) and symmetrically distributed about the axis of the cutter shaft (3), the abutting member (36) is two and is in threaded connection with the threaded through holes, and the pushing rod (35) is two and corresponds to the two abutting members (36) one by one.

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