TW201609286A - Lathe center device with auto swing head - Google Patents

Abstract

The present invention provides a lathe center device with auto swing head, which comprises a lathe center handle and a head part sliding member. The lathe center handle includes a handle part and a head part formed on the top of the handle part. The head part is provided with a combination part. The head part sliding member is disposed on the head part of the lathe center handle in a sliding manner, and includes a sliding member, a fastening member fastened to the top of the sliding member, a fixing member inserted in the sliding member and fixed to the head part, and a lathe center head combined with the sliding assembly, which revolves around the combination part. The present invention can make use of the gap formed between the head part sliding member and the combination part of the lathe center handle combined therewith to slide and swing automatically in a circular orbit manner, so as to balance and compensate for the center deflection tolerance generated in holding a processed object. As a result, the lathe center can be completely aligned with the center of the processed object without causing the lathe center to be deflected, thereby achieving the effect of prolonging the service life of the lathe center bearing and the lathe tailstock.

Description

Thimble device with automatic yaw on the head

The invention relates to a thimble device for lathe processing, in particular to a thimble device for automatically yawing a head.

The existing lathe is for holding the workpiece on the chuck of the spindle, and the thimble on the tailstock of the lathe is placed against the center hole of the end of the workpiece. When the spindle of the lathe drives the workpiece to be rotated and turned, the thimble can withstand the processing. The end of the object rotates synchronously with the workpiece, so that the workpiece can be stably rotated, and the workpiece to be rotated is cut by the cutter.

The general thimble can be divided into a fixed thimble and a movable thimble, and the movable thimble can be further divided into a fixed movable thimble and a replacement movable thimble, wherein:

As shown in FIG. 12, there is a conventional fixed thimble 60, which includes a top handle 61 which is a handle extending in the upper and lower directions, and the top handle 61 is A tip portion 610 is formed on the top end, and a handle portion 611 is formed on the lower side of the head portion 610. A nut 62 for assisting the thimble to exit the lathe tailstock is screwed on the lower side of the head portion 610. The top core handle 61 The top end forms a needle 612 that can be used to hold the center hole of the end of the workpiece.

As shown in FIG. 13 , the fixed movable ejector pin 70 includes a top core sleeve 71 and a mandrel 72 extending in the upper and lower directions and having an assembly space 710 formed therein. An upper bearing 73, a thrust bearing 74 and a lower bearing 75 are fixed on the side wall surface of the assembly space 710 in the upper and lower positions, and the spindle 72 is disposed in the front and rear directions. Between the upper bearing 73, the thrust bearing 74 and the lower bearing 75, the top end of the spindle 72 projects forwardly toward the top end of the top sleeve 71 and forms a ejector pin 721, which is attached to the heart. The shaft 72 is integrally formed into various tapered shapes, for example, various types of tapered shapes such as a standard type, a slender type, and an umbrella type.

As shown in FIG. 14, the movable movable ejector pin 80 includes a top core sleeve 81 and a spindle 82, and a detachable replacement ejector pin 821 is disposed at the top end of the spindle shaft 82. The replacement movable thimble is provided. The difference between the 80 and the fixed movable ejector 70 is whether the ejector pin 821 can be replaced. The mandrel 82 is provided with an insertion hole 822 for inserting a variety of different shapes of the ejector pin 821, such as a standard type, a slim type, A thimble head 821 of various tapered shapes, such as an umbrella type.

When the existing thimble is used, due to the tolerance of the center yaw of the workpiece, especially the center yaw tolerance of the cast part and the forged part is large, the thimble cannot be completely aligned with the center of the workpiece, which may cause the thimble to yaw and cannot Tightening the workpiece, it is easy to produce a jump knife, which will cause the machining process to be unstable, which will affect the processing accuracy. At the same time, the thimble will not be completely aligned with the center of the workpiece, which will cause yaw, which will affect the thimble bearing and the lathe tailstock. Service life.

In order to solve the problem that the existing thimble cannot be aligned due to the tolerance of the center yaw of the workpiece itself, which causes the machining process to be unstable and affects the service life of the thimble bearing and the lathe tailstock, the main object of the present invention is to provide The utility model relates to a thimble device capable of automatically yawing a head, which is provided with a head sliding member which can slide with the workpiece yaw, and can be used for compensating the center yaw tolerance generated by the workpiece during clamping, so that the thimble is completely opposite The quasi-machining center further improves the aforementioned problems.

The technical means used in the present invention is to provide a thimble device for automatically yawing the head, comprising: a top handle which forms a head at the top end and a tapered handle on the lower side of the head a joint portion is provided on the top surface of the head at a position of the shaft center, the joint portion is a circular cylinder protruding in the axial direction; a head slider is correspondingly and slidably disposed on the shaft a head of the top handle, and comprising a sliding member, a clamping member, a fixing member and a thimble; wherein the sliding member is slidably circumferentially and concavely and convexly connected to the joint portion, the sliding member is The utility model has a disk portion, a connecting portion and a movable hole, wherein the disk portion forms a disk body having a diameter close to the head portion at the bottom of the sliding member, and the socket portion is located at an axial center of the disk portion. And extending along the axial direction, the movable hole is penetrated through the socket portion and the axial center position of the disk portion, the sliding member is correspondingly sleeved on the joint portion, and the diameter of the movable hole is Greater than the diameter of the joint, forming a structure between the sliding member and the joint portion a movable spacing; the fixing member passes through the engaging member and is coupled to the joint portion; the engaging member is clamped over the sliding member; the ejector needle is detachably coupled to the sliding member Socket.

The thimble device of the above-mentioned head can be automatically yawed, wherein the ejector pin comprises a barrel body, a thimble portion integrally formed on the top of the barrel body, and a sleeve hole formed in the inside of the barrel body, the thimble head system The sleeve hole is correspondingly connected to the sleeve portion of the sliding member.

The thimble device of the above-mentioned head can be automatically yawed, wherein the ejector pin comprises a barrel body, a thimble portion detachably coupled to the barrel body, and a ferrule hole formed inside the barrel body, the thimble head system The sleeve hole is correspondingly connected to the sleeve portion of the sliding member, and the barrel body and the thimble portion are joined to each other in a tapered manner.

The aforementioned thimble device can be automatically yawed, wherein the top handle is a top handle of the fixed thimble.

The aforementioned thimble device can be automatically yawed, wherein the top handle is a top handle of the movable thimble.

The technical means utilized by the present invention also provides another thimble device for automatically yawing the head, comprising a top handle, which forms a head at the top end and a tapered handle on the lower side of the head. a joint portion is disposed on the top surface of the head at the axial center position; a head slider correspondingly and slidably disposed on the head of the top handle, and includes a sliding member and a card a fixing member, a second sliding member, a thimble, a second clamping member and a second fixing member; wherein the sliding member has a disk portion, a set of connecting portions and a movable hole, The disk portion is formed on the bottom of the sliding member with a disk body having a diameter close to the head portion. The socket portion is located at the axial center of the disk portion and protrudes along the axial direction. The movable hole is penetrated through the disk portion. The sleeve portion and the axial center position of the disk portion, the sliding member is correspondingly sleeved on the joint portion, and the diameter of the movable hole is larger than the diameter of the joint portion, so that the sliding member and the joint portion are The intermediate system forms an annular movable spacing; the fixing member passes through the clamping member and Connected to the joint portion; the card member is clamped over the slide member; the second slide member is coupled to the sleeve portion of the slide member and has a shaft center position disposed on the second slider member a second socket portion; the ejector needle is slidably circumferentially and embossed to the second sleeve portion of the second sliding member; the second fixing member passes through the second clamping member and is correspondingly connected to The second engaging portion; the second clamping member is clamped over the second sliding member.

The thimble device of the above-mentioned head can be automatically yawed, wherein the second sliding member has a second sleeve portion, a second disk portion and a second joint portion, the second sleeve portion is cylindrical and Forming a sleeve hole that can be engaged with the sleeve portion of the sliding member, the second disk portion is located at the top of the second socket portion, and the second joint portion protrudes from the second disk portion The thimble position is correspondingly fitted to the second joint portion by a set of holes, the diameter of the sleeve hole is larger than the outer diameter of the second joint portion, and the ejector needle and the second sliding portion An annular spacing is provided between the second joints of the pieces for circumferential bypassing.

The aforementioned thimble device can be automatically yawed, wherein the top handle is a top handle of the fixed thimble.

The aforementioned thimble device can be automatically yawed, wherein the top handle is a top handle of the movable thimble.

The present invention utilizes the provided thimble device for automatically yawing the head, and the power enhancements that can be obtained include

1. According to the invention, the spacing formed between the joint portion of the head slider and the top handle allows the head slider to automatically slide and yaw in a circumferential manner to balance the compensation of the workpiece during clamping. The center yaw tolerance allows the thimble to be fully aligned with the center of the workpiece without thimble deflection, which increases the life of the thimble bearing and the lathe tailstock.

2. Since the thimble of the invention can be completely aligned with the center of the workpiece, the thimble does not cause yaw, and the workpiece can be effectively tightened without causing a jump knife, thereby achieving the purpose of stable cutting.

In order to be able to understand the technical features and practical functions of the present invention in detail, it can be implemented in accordance with the contents of the specification, and further illustrated in the preferred embodiment as illustrated in the following:

The present invention is a thimble device in which the head can be automatically yawed. Referring to the first preferred embodiment of FIGS. 1 and 2, a top handle 10 and a head slider 20 are included.

As shown in FIG. 1 and FIG. 2, the top handle 10 is a top handle of a fixed thimble, and is a handle extending in the front and rear directions, and a head 11 is formed at a top end of the top handle 10, and A shank 12 having a taper is formed on the lower side of the head portion 11. A joint portion 110 is disposed on the top surface of the head portion 11 at a position along the axial center. In the embodiment, the joint portion 110 is along the axial center. A circular cylinder protruding in a direction, and a screw hole 111 is defined in a top of the joint portion 110.

As shown in FIG. 1 and FIG. 2, the head slider 20 is disposed on the head 11 of the top handle 10, and includes a sliding member 21, a clamping member 22, a fixing member 23, and a thimble. And the two fixing bolts 25; wherein the sliding member 21 has a disk portion 211, a sleeve portion 212 and a movable hole 213. The disk portion 211 is formed on the bottom of the sliding member 21 to form a diameter and the head portion 11. The sleeve portion 212 is located at the axial center of the disk portion 211 and protrudes along the axial direction. The movable hole 213 extends through the sleeve portion 212 and the axis of the disk portion 211. The position of the movable hole 213 is larger than the diameter of the joint portion 110. The sliding member 21 is correspondingly sleeved on the joint portion 110, and the sliding member 21 and the joint portion 110 are formed. The annular movable spacing is such that the top surface of the socket portion 212 is slightly lower than the top surface of the joint portion 110.

As shown in FIG. 1 and FIG. 2 , the clamping member 22 is correspondingly attached to the top of the sliding member 21 , and the diameter of the bottom of the clamping member 22 is larger than the diameter of the movable hole 213 , and the clamping member 22 is A through hole 221 is defined in the axial center of the shaft hole 213. The fixing member 23 is a bolt. The fixing member 23 penetrates into the insertion hole 221 at one end and is screwed and fixed to the screw hole 111. The fixing member 23 does not penetrate the one end of the insertion hole 221 to press the engaging member 22, so that the sliding member 21 is restricted by the engaging member 22 without being detached.

As shown in FIG. 1 and FIG. 2, the ejector pin 24 is a standard ejector pin, and has a cylindrical barrel 241, a thimble portion 242 integrally formed with a tip-shaped portion at the top of the barrel 241, and a thimble portion 242. a sleeve hole 243 formed in the inner portion of the barrel 241 and two pressing holes 244 formed in the barrel body 241 and communicating with the sleeve hole 243. The thimble sleeve 241 is correspondingly sleeved with the sleeve hole 243. The sleeve portion 212 of the sliding member 21 is screwed to the pressing hole 244 by the two fixing bolts 25 and is pressed against the outer circumference of the sleeve portion 212 to fix the thimble head 24 to the sliding member 21. And with the slider 21 act together.

The first preferred embodiment of the present invention is used in that the top handle 10 is fixed to a lathe tailstock (not shown), and the top needle 24 of the head slider 20 corresponds to a lathe. The work object (not shown) on the figure (not shown), because the work object itself has a center yaw tolerance, the spacing formed between the head slider 20 and the joint portion 11 of the top core handle 10 allows The head slider 20 can automatically slide the yaw in a circumferential manner to balance the center yaw tolerance generated by the workpiece during clamping, so that the invention can be completely aligned with the center of the workpiece without causing the thimble Since the apex head 24 can be completely aligned with the center of the workpiece, the thimble head 24 does not cause yaw, and the workpiece can be more effectively tightened without causing a jump knife, thereby achieving stable cutting processing. .

As shown in FIG. 3 and FIG. 4, it is the appearance of the head sliders 20A, 20B having different shapes, and the top end of the top needle 24A of the head slider 20A is a double-cone type thimble tip shape, the head The top end of the ejector head 24B of the slider 20B is shaped like an umbrella type thimble, and the head sliders 20A, 20B can be correspondingly replaced and mounted on the top handle 10 to accomplish various processing purposes.

The second preferred embodiment of the present invention is as shown in FIG. 5, which is substantially the same as the first preferred embodiment. The difference is that the ejector pin 24C of the head slider 20C of the second preferred embodiment is a replacement ejector pin. The barrel body 241C and the ejector pin portion 242C are separable, and the barrel body 241C and the ejector pin portion 242C are joined to each other in a tapered manner, and an ejection hole 245 is defined in the outer circumference of the barrel body 241C. The ejector hole 245 is adapted to be inserted by a hand tool to separate the ejector pin portion 242C from the barrel body 241C. Preferably, the ejector pin portion 242C is a standard thimble tip shape. The second preferred embodiment has the top portion. The needle 24C is a replacement ejector pin, and the other modes of use are the same as those of the first preferred embodiment.

As shown in FIG. 6 and FIG. 7 , the ejector pins 24D and 24E are replacement ejector pins having different shapes. As shown in FIG. 6 , the ejector pin portion 242D of the ejector pin 24D is a double-cone type thimble tip shape. Removably coupled to the barrel 241D, as shown in FIG. 7, the ejector portion 242E of the ejector head 24E is shaped like a mushroom-shaped thimble, and is detachably coupled to the barrel 241D, the thimble portion 242D, The 242E can be directly replaced and processed according to various workpieces, and the other modes of use are the same as those disclosed in the first and second preferred embodiments, and will not be described here.

A third preferred embodiment of the present invention is shown in FIG. 8 and is substantially the same as the first preferred embodiment. The difference is that the top handle 10F is a movable ejector, and the head slider 20F is coupled to the first embodiment. For example, the head slider 20 is the same, and the ejector head 24F of the head slider 20F can also be replaced with a standard type, a double cone type, an umbrella type or other different shapes of thimble tip shapes according to the requirements of the workpiece, and the like. The manner of use and the manner of assembly are substantially the same as those of the first preferred embodiment, and will not be described here.

A fourth preferred embodiment of the present invention is shown in FIG. 9 and is substantially the same as the second preferred embodiment. The difference is that the top handle 10G is a top handle of a movable ejector, and the head slider 20G The ejector pin 24G is a replacement ejector pin. The ejector pin 24G has a barrel body 241G and a thimble portion 242G detachable from the barrel body 241. Other methods of use and assembly are preferred to the first, second and third. The disclosures in the embodiments are substantially the same and will not be described here.

The fifth preferred embodiment of the present invention is substantially the same as the third and fourth embodiments, as shown in Figs. 10 and 11, except that the top handle 10H is a top handle of the movable thimble. The sliding member 20H is a double yaw type ejector; wherein the head slider 20H includes a sliding member 21, a clamping member 22, a fixing member 23, a ejector pin 24H and two, which are the same as the first embodiment. The fixing bolt 25 further includes a second sliding member 26, a second clamping member 27 and a second fixing member 28.

The sliding member 21, the clamping member 22 and the fixing member 23 are coupled to the joint portion 110 of the top handle 10, and the second sliding member 26 is fixed to the sliding member 21 by the two fixing bolts 25. The sleeve portion 212 has a second sleeve portion 261, a second disk portion 262 and a second joint portion 263. The second socket portion 261 has a cylindrical shape and is formed with a sliding portion. The socket portion 212 of the member 21 is sleeved with a sleeve hole 2611. The second disk portion 262 is located at the top of the second socket portion 261. The second joint portion 263 is protruded from the second disk portion 262. The accommodating hole 2631 is disposed in the second joint portion 263, and the thimble head 24H is in the shape of an umbrella-like thimble. The thimble head 24H is correspondingly sleeved with the sleeve hole 243. The second joint portion 263 has a diameter larger than the outer diameter of the second joint portion 263, and the thimble head 24H and the second joint portion 263 of the second slide member 26 are formed to be circumferentially wound. The annular pitch of the row action is, and the top surface of the ejector pin 24H is slightly lower than the top surface of the second joint portion 263.

The second clamping member 27 and the second fixing member 28 are the same as the clamping member 22 and the fixing member 23, and the second clamping member 27 is correspondingly engaged with the top of the second sliding member 26, the first The second fixing member 28 is disposed through the second engaging member 27 and correspondingly coupled to the engaging hole 2631 of the second engaging portion 263, so that the ejector pin 24 is restricted by the second engaging member 27 without being disengaged.

The manner of use of the fifth preferred embodiment is substantially the same as that of the other embodiments. In the present embodiment, when the head slider 20H abuts against the workpiece, the head slider 20H has the slider at the same time. 21 and the second sliding member 26 are configured such that the sliding member 21 can be yawed about the top handle 10H, and the ejector head 24H can be yawed around the second sliding member 26 to form a yaw. The double yaw type is suitable for workpieces with large pore sizes.

In the state of use, the invention can select the shape of the corresponding ejector pin according to the size or shape of the aperture of the workpiece, and is not limited to the fixed top handle or the movable top handle, but the head of the invention The manner in which the partial slider is coupled to the top handle is not limited to the concave-convex fit type disclosed in the embodiment, and may be a state in which the unevenness is reversed, and the design of the present invention is extremely flexible and convenient to use.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can use the present invention without departing from the technical features of the present invention. Equivalent embodiments of the local changes or modifications made by the disclosed technology are still within the scope of the technical features of the present invention.

10, 10F, 10G, 10H‧‧‧ top handle
11‧‧‧ head
110‧‧‧Combination Department
111‧‧‧ screw holes
12‧‧‧ handle
20, 20A, 20B, 20C, 20F, 20G, 20H‧‧‧ head sliders
21‧‧‧Sliding parts
211‧‧‧
212‧‧‧ Sockets
213‧‧‧ activity hole
22‧‧‧Card parts
221‧‧‧Into the hole
23‧‧‧Fixed parts
24, 24A, 24B, 24C, 24D, 24E, 24F, 24G, 24H‧‧‧ thimbles
241, 241C‧‧‧
242, 242C, 242D, 242E‧‧‧ thimble
243‧‧‧Close hole
244‧‧‧tightening holes
245‧‧‧ Launch hole
25‧‧‧ fixing bolts
26‧‧‧Second slide
261‧‧‧Second socket
262‧‧‧ Second Part
263‧‧‧Second junction
27‧‧‧Two card parts
28‧‧‧Second fixture
60‧‧‧Fixed thimble
61‧‧‧Top handle
610‧‧‧ head
611‧‧‧ handle
612‧‧‧Top needle
62‧‧‧ nuts
70‧‧‧Fixed movable thimble
71‧‧‧Top sleeve
710‧‧‧Assembly space
72‧‧‧ mandrel
721‧‧‧Top needle
73‧‧‧Upper bearing
74‧‧‧ thrust bearing
75‧‧‧lower bearing
80‧‧‧Replaceable movable thimble
81‧‧‧Top sleeve
82‧‧‧ mandrel
821‧‧‧Top needle
822‧‧‧ inserted holes

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an external view of a first preferred embodiment of the present invention. Figure 2 is an exploded view of a first preferred embodiment of the present invention. Figure 3 is an exploded view of the head slider of the first preferred embodiment of the present invention with a double-cone type ejector. Figure 4 is an exploded view of the head slider of the first preferred embodiment of the present invention in combination with an umbrella type ejector. Figure 5 is an exploded view of a second preferred embodiment of the present invention. Figure 6 is an exploded view of the head slider of the second preferred embodiment of the present invention with a double-cone type ejector. Figure 7 is an exploded view of the head slider of the second preferred embodiment of the present invention in combination with an umbrella type ejector pin. Figure 8 is an external view of a third preferred embodiment of the present invention. Figure 9 is an external view of a fourth preferred embodiment of the present invention. Figure 10 is an external view of a fifth preferred embodiment of the present invention. Figure 11 is an exploded view of a fifth preferred embodiment of the present invention. Fig. 12 is an external view of a conventional fixed ejector pin. Fig. 13 is an external view of a conventional fixed type movable ejector pin. Fig. 14 is an external view of a conventional replacement type movable thimble.

10‧‧‧Top handle

11‧‧‧ head

110‧‧‧Combination Department

111‧‧‧ screw holes

12‧‧‧ handle

20‧‧‧ head slider

21‧‧‧Sliding parts

211‧‧‧

212‧‧‧ Sockets

213‧‧‧ activity hole

22‧‧‧Card parts

221‧‧‧Into the hole

23‧‧‧Fixed parts

24‧‧‧Top needle

241‧‧‧

242‧‧‧ thimble

243‧‧‧Close hole

244‧‧‧tightening holes

25‧‧‧ fixing bolts

Claims (9)

A thimble device for automatically yawing a head, comprising a top handle, forming a head at the top end, and forming a tapered handle on the lower side of the head, the top surface of the head being on the shaft The core position is provided with a joint portion, which is a circular cylinder protruding in the axial direction; a head slider correspondingly and slidably disposed on the head of the top handle, and including a sliding a sliding member that is slidably circumferentially slidably and embossed to the joint portion, the sliding member having a disk portion, a set of joint portions, and a shank portion a movable hole, the disk portion is formed on the bottom of the sliding member to form a disk body having a diameter close to the head portion, and the socket portion is located at an axial center of the disk portion and protrudes along the axial direction, the activity The hole is inserted through the socket portion and the axial center of the disk portion, and the sliding member is correspondingly sleeved on the joint portion, and the diameter of the movable hole is larger than the diameter of the joint portion, so that the sliding member Forming an annular movable distance with the joint; the fastener is worn by the fastener The component is coupled to the joint portion; the card member is clamped over the slider; the ejector pin is detachably and concavely coupled to the sleeve portion of the slider. The thimble device of claim 1, wherein the ejector pin comprises a barrel body, a thimble portion integrally formed on the top of the barrel body, and a sleeve hole formed in the barrel body. The thimble head is correspondingly connected to the sleeve portion of the sliding member by the sleeve hole. The thimble device of claim 1, wherein the ejector pin comprises a barrel body, a thimble portion detachably coupled to the barrel body, and a sleeve hole formed in the barrel body. The ejector pin is correspondingly connected to the sleeve portion of the sliding member by the sleeve hole, and the barrel body and the thimble portion are mutually engaged with each other in a tapered manner. The thimble device for automatically yawing the head according to any one of claims 1 to 3, wherein the top handle is a top handle of the fixed thimble. The thimble device of claim 1, wherein the top handle is a top handle of the movable thimble. A thimble device for automatically yawing a head, comprising a top handle, forming a head at the top end, and forming a tapered handle on the lower side of the head, the top surface of the head being on the shaft The core position is provided with a joint portion; a head slider correspondingly and slidably disposed on the head of the top handle, and includes a sliding member, a clamping member, a fixing member and a second sliding member a top needle, a second clamping member and a second fixing member; wherein the sliding member has a disk portion, a set of connecting portions and a movable hole, the disk portion is formed with a diameter at the bottom of the sliding member a disk body similar to the head portion, the socket portion is located at an axial center of the disk portion, and protrudes along an axial direction, the movable hole is penetrated through the socket portion and the axial center position of the disk portion The sliding member is correspondingly sleeved on the joint portion, and the diameter of the movable hole is larger than the diameter of the joint portion, so that an annular movable distance is formed between the sliding member and the joint portion; The member is threaded and attached to the combination The card member is clamped over the sliding member; the second sliding member is coupled to the sleeve portion of the sliding member and has a second sleeve portion disposed at an axial center of the second sliding member The thimble is slidably circumferentially and embossed to the second sleeve of the second sliding member; the second fixing member passes through the second clamping member and is correspondingly coupled to the second coupling portion The second clamping member is clamped over the second sliding member. The thimble device of claim 6, wherein the second sliding member has a second sleeve portion, a second disk portion and a second joint portion, the second socket portion Forming a cylindrical shape and internally forming a sleeve hole that can be engaged with the sleeve portion of the sliding member, the second disk portion is located at the top of the second socket portion, and the second joint portion is convexly extended Positioning the axial position of the second disk portion, the ejector pin is correspondingly sleeved to the second joint portion by a set of holes, the diameter of the sleeve hole is larger than the outer diameter of the second joint portion, and the thimble head An annular pitch is provided between the second joint portion of the second sliding member for circumferentially bypassing. The thimble device for automatically yawing the head according to claim 6 or 7, wherein the top handle is a top handle of the fixed thimble. The thimble device for automatically yawing the head according to claim 6 or 7, wherein the top handle is a top handle of the movable thimble.