JPH027329Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for feeding a plurality of table devices in which the forward or backward speed of a shaft is determined by the pitch difference of screws formed on the shaft and by switching a clutch.

Switching devices for rapid traverse, slow traverse, coarse traverse, and precision traverse require a complex gear-based transmission mechanism or a combination with a worm gear, in other words, a mechanism in which the axes intersect at right angles, which requires a considerable amount of space and requires high precision. A feeding mechanism is difficult.

In addition, the speed at which the cutting tool, table, or workpiece moves from side to side can be determined by applying power transmission to a single shaft using complex structures such as gears, belt chains, link mechanisms, and cam mechanisms. This is difficult because it becomes large in size, and maintenance and inspection are not easy due to the difficulty in assembling it into mechanical equipment.

Also, screws with different leads are formed at intervals above and below one shaft, and by fixing or loosening the floating nut that is screwed into the screw,
Feed mechanisms that are capable of low speed and high speed feed are known. ("Automatic Books" published by Taiga Publishing Co., Ltd. on May 1, 1971) In addition, threads of the same direction with different pitches are cut on both sides of one shaft and are screwed into the fixed side and movable side respectively. The mechanism that does this is known. (Showa 32
("Mechanical Movement Mechanism" published by Gihodo Co., Ltd. on October 5, 2016) However, these are just basic principles regarding screws with different leads and nuts that are screwed into these screws, and it is difficult to immediately install them on all machines. It's impossible.

The object of the present invention is to provide two ball screws with different pitches and a ball spline at the ends of a single shaft, and a non-movable ball screw nut screwed into one of the ball screws to be connected to the housing by switching the clutch. An object of the present invention is to provide a feeding mechanism for a plurality of table devices, which enables rapid feeding or slow feeding of a movable ball screw nut and an integral table by a pitch difference by being fixed to the table or connected to a ball spline.

In other words, when a screw with a pitch of 10 mm and a screw with a pitch of 9.9 mm are set on a single shaft, the difference in pitch is 0.1 mm.

When the non-movable screw is fixed and the shaft rotates once, the movable ball screw nut moves only 0.1 per revolution.

When the shaft and the non-movable ball screw nut rotate together, for example, through a pin, the shaft rotates in a fixed position, and the movable ball screw nut moves 10 mm per rotation.

That is, when the movable ball screw nut is fixed to the machine body, it moves 0.1 mm in one rotation.

When the ball screw nut is rotated together with the shaft, it is easier to switch between rough feed (rapid feed) and precision feed (fine feed) by inserting and removing a 1.0 mm pin.

In this case, a difference of 100 times is possible.

Conventional mechanisms are very complex and require a large number of parts or feeding mechanisms, so they cannot be made compact, and the mechanical parts are complex and use a large number of parts, which can lead to backlash or parts accuracy errors, so precision feeding is required. It is especially difficult for

According to the present invention, there is almost no backlash due to the use of a ball screw nut and a ball spline, the mechanism is extremely simple, and the number of parts is small, so extremely precise feeding is possible.

In the present invention, a non-movable ball screw nut means that a portion of the nut cannot be moved even by rotation of the ball screw.

The gist of the present invention is to provide a shaft in which a spline is formed on one side and at least two or more screws formed at arbitrary intervals on the other side, and there is a pitch difference between these screws, and a shaft that matches the pitch difference. A movable ball screw nut and a non-movable ball screw nut are respectively screwed together, and these movable ball screw nuts move forward or backward as the shaft rotates, while the non-movable ball screw nut is moved by the housing by switching the clutch. In the feeding mechanism of the table device, one of the movable ball screw nuts is fixed to the housing or connected to the ball spline, thereby making it possible to perform rapid feed, rough feed, slow feed, or precision feed of the movable ball screw nut using one shaft. A plurality of tables utilizing the pitch difference of the screws, characterized in that the screws of the ball screw are smaller than the pitch of the fixed ball screw, and the screws of the other movable ball screw nut are formed smaller than the screws of the movable ball screw nut. Located in the feeding mechanism of the device.

A preferred example of the present invention will be described below based on the drawings.

Reference numeral 10 in the figure is the housing of various machines,
The flange 16 of the nut case 11, the shaft, and the ball spline 13 are attached to the housing 10.
bearing cases 14 are attached via bolts 15, respectively.

An inner ring 19 is fitted to the inner peripheral surface of the nut case 11 via a needle bearing 18, and a non-movable ball screw nut 20 of a double nut type is further fitted to the inner surface of the nut case 11.

The non-movable ball screw nut 20 is arranged on the left and right with a shim plate in the middle, and the shaft 22 forming the first screw 21 is screwed together via the ball, while the intermediate part contacts the sliding surface 23 of the flange 16 of the nut case 11. A sliding surface 25 of the joint member 24 is disposed coaxially, and a radially inner flange 26 of the intermediate joint member 24 is fixed to a flange 28 of the ball screw nut 20 via bolts 27.

Reference numeral 29 is a cap-shaped joint member with a brimmed cross section having a depression in the center, and a sliding surface 31 of a flange 30 at one end of the joint member 29 abuts against a sliding surface 31' of the intermediate joint member 24.

One end flange 30 of the joint member 29, the intermediate joint member 24, and the flange 16 of the nut case 11.
Knock pin through holes 32, 33, and 34 are formed on the same axis.

The end member 35 of the joint member 29 has a through hole 3 in the center.
6 is formed, and a flange 38 of the ball spline 13 is formed in the axial notch 39 of the end member 35.
are fitted and fixed with bolts 37, 37.

A spline 41 of a ball spline shaft 40 is slidably fitted into the inner surface of the ball spline 13 via a ball. (See FIG. 2) A metal push 42 is fitted on the outer periphery of the ball spline 13, and the metal push 42 is attached to the bearing case 14.

An end cover 43 is attached to the end of the ball spline 13 via screws, and the end cover 43 has a space 44 corresponding to the amount of movement of the shaft 22, which moves forward or backward while rotating.

A key groove is formed on the outer periphery of the ball spline 13 and the sprocket 46, and a flat key 45 is fitted into the key groove and fixed, and the sprocket 46 is attached between the bearing case 14 and the end cover 43.

Also, the end cover 4 is removed from the sprocket 46.
One end of a connecting rod 48 is attached to the ring body 47 protruding toward the third side, and a handle 49 is attached to the other end.

Next, the clutch is switched by pushing the knock pin 50 in FIG. 1 manually or mechanically using a known cam mechanism, link mechanism, etc. Instead, a driving pin 51 and a driven pin 52 are arranged in the electromagnetic coils 91 and 92 on the left and right, respectively.

Therefore, by energizing the electromagnetic coil 92 side, the driving pin 51 and the driven pin 52 are attracted, and the contact surfaces of both pins are located between the intermediate joint member 24 and the flange 30 of the joint member.

Reference numeral 65 denotes a second screw formed on the left side of the shaft 22, and the second screw is formed smaller in pitch than the first screw 21.

Reference numeral 66 designates a double-nut movable ball screw nut 66 that is screwed onto the second screw 65. Nuts 68 and 69 are arranged on the left and right sides of the second movable ball screw nut 66 with a shim plate 67 in between.

A third screw 70 is formed at a predetermined distance from the second screw 65 of the shaft 22, and the third screw 70 is formed smaller in pitch than the second screw 65.

A third ball screw nut 71 is a double nut screwed onto the third screw 70, and the ball screw nut 71 has nuts 73 and 74 arranged on the left and right sides with a shim plate 72 in the middle.

Reference numerals 75 and 76 denote first and second tables, and linear bearing bodies 77, 78, 79, and 80 are fixed with bolts to the lower surfaces of the tables 75 and 76 in the front, back, left, and right directions, respectively.
78, 79, and 80 are fitted into track stands 81 and 82, respectively. (See FIG. 3) The tracks 81, 82 are attached to pedestals 83, 84 formed in the housing 10 via holders 85, 86 and bolts 87, 88.

The second screw 65 of the shaft 22 is attached to the center of the first table 75, and the third screw 70 is similarly attached to the center of the second table 76.

90 is a workpiece, and the second screw 6
A cutting tool (not shown) is mounted on each of the first table 75 and the second table 76, and the cutting tools are placed facing each other as shown by arrows a and a'. It is possible to cut both the left and right sides of the workpiece at the same time, or it is possible to quickly retreat as shown by arrows b and b' by switching the dowel pins after the cutting operation is completed.

In the figure, reference numeral 93 is a stepping motor, 94 is a timing belt, and 95 is an electromagnetic coil 91, 92.
96 is a washer.

Table 7 of machine tools such as grinders and milling machines
5 and 76 will be explained.

As mentioned above, the shaft 22
A third screw 70 is formed at a predetermined distance from the second screw 65 .

The pinch of the third screw 70 is, for example, 9.9, which is 0.1 smaller than the pitch of the second screw 65 of 10.0.

First, by moving the drive pin 51 rightward in the drawing, the drive pin 51 moves to the position indicated by the dotted line, and its end surface is located on the sliding surface 31 of the joint member 30 and the intermediate joint member 24. (See FIG. 1) Next, when the shaft 22 is rotated to the left by rotating the handle 49 or starting the stepping motor 93, the spline shaft 40 is rotated together with the ball spline 13, and at the same time, one end of the ball spline 13 is rotated. The connected joint members 29 are rotated at the same speed.

Sliding surface 3 of one end flange 30 of the joint member 29
1 only slides on the sliding surface of the intermediate joint member 24, and no power is transmitted to the immovable first ball screw nut 20.

Therefore, the shaft 22 is fixed to the immovable first ball screw nut 20 (fixed to the housing).
The vehicle moves backward (to the right in the figure) while being guided by the first screw 21 of the vehicle.

Furthermore, the shaft 22, which rotates to the left, has a second movable ball screw nut 66 which is screwed into a second screw 65 formed coaxially (the pitch thereof is smaller than that of the non-movable first ball screw nut 20). ) is moved forward to the left towards the figure.

The speed of the second movable ball screw nut 66 is a slow feed corresponding to the pitch difference of the first non-movable ball screw nut 20.

For example, assuming that the pitch of the first non-movable ball screw nut 20 is 10.1 and the pitch of the first movable ball screw nut is 10.0, the speed of the first movable ball screw nut 66 will be a slow feed with a difference of 0.1. .

At this time, the first table 75 moves forward to the left with a difference of 0.1 with respect to the first non-movable ball screw nut 20, and at the same time, the third screw moves further than the second screw.
Since it is 0.1 smaller, the second table 76 relatively retreats by 0.1 in the right direction opposite to the first table 75,
Processing can be performed from both the left and right sides of the workpiece 90.

Next, when performing fast forwarding, the driving pin 51 is moved to the left in the figure, and the end surface of the driving pin 51 and the driven pin 52 are moved to the left in a state where they are in contact with each other, and both pins 51, The end face of 52 is located between the sliding surface 23 of the flange 16 of the nut case 11 and the sliding surface 25 of the intermediate joint member 24.

Next, when the shaft 22 is rotated to the left, the joint member 29 rotates simultaneously with the ball spline 13.
The intermediate joint member 24 is rotated in the same direction by the dowel pin 50.

By simultaneously rotating the non-movable first ball screw nut 20 and the shaft 22 together with the intermediate joint member 24, the shaft 22 does not move forward or backward, but since it is screwed into the second movable ball screw nut 66, , second movable ball screw nut 66
The shaft 22 is moved back to the right in the figure, and at the same time, the second movable ball screw nut 66 screwed onto the shaft 22 also moves in the figure due to the pitch difference with the non-movable first ball screw nut 20. Move forward towards the left.

At this time, the first table 75 retreats to the right with a difference of 0.1 with respect to the first non-movable ball screw nut 20, and at the same time, the third screw moves away from the second screw.
Since the second table 76 is relatively smaller than the first table 75 by 0.1, the workpiece 90 can be removed.

The unique effect of the present invention is that cutting can be performed simultaneously at a speed corresponding to the difference in pitch of threads formed on a single shaft.

FIG. 4 shows another embodiment of the device of the present invention.
A slow feed switching device is directly attached to the shaft 22.

Reference numerals 101 and 102 indicate both side walls of the housing, and a stop plate 104 for stopping the rotation of the first field is attached to the left side of the side wall of the right housing 102 with screws 103 as viewed in the figure. A field core 106 having a built-in annular excitation coil 105 is attached to the side surface of the coil by welding or the like.

A rolling bearing 10 is provided on the inner periphery of the field core 106.
7 is fitted, and a rotor 109 with a hub 108 is fitted on the inner periphery of the rolling bearing 107.

The rotor 109 with the hub 108 has the excitation coil 1
05 and the field core 106, a rotating disk 110 is formed in the radial direction, a flange 111 is formed at the tip, and a hub 10 in the axial direction is formed.
The hub 8 has a gap such that its inner surface 118 does not come into contact with the outer circumferential surface 117 of the ball spline shaft 40 and is formed to protrude slightly from the through hole 112 of the side wall 102.
3, a cup-shaped joint member 114 is fitted.

A flange 38 of the ball spline 13 is fitted into the axial notch 116 of the end member 115 of the joint member 114 via a bolt 37 and fixed with the bolt 37.

The radially inner flange 121 of the cylindrical intermediate joint member 120, which fits into the flange 28 of the immovable ball screw nut 20, is fixed via bolts 27.

A radially outer flange 123 is formed extending in the axial direction with a gap between the inner periphery 122 of the intermediate joint member 120 and the shaft 22, and a first armature is formed on one end surface 124 of the outer flange 123. 1
25 is fixed via a bolt 126, and a second armature 128 is fixed to the other end surface 127 via a bolt 126.
6.

A nut case 11 is attached to the left housing 101.
A flange 16 is attached via bolts 15.

The end face of the first armature 125 and the first rotor 1
A slight gap C is formed with the end face of 09.

An inner ring 19 is fitted to the inner peripheral surface of the nut case 11 via a needle bearing 18, and a non-movable ball screw nut 20 of a double nut type is further fitted to the inner surface of the nut case 11.

A screw 103 is installed on the right side wall of the housing 101.
A detent plate 129 is attached to stop the rotation of the second field, and a second field core 131 having a built-in second annular coil 130 is attached to the side surface of the detent plate 129 by means such as welding.

A second rotor 1 is provided on the side surface of the field core 131.
32 is attached, and a slight gap C is formed between the end surface of the second rotor 132 and the end surface of the second armature 128.

Regarding the operation, first, when the shaft 22 is rotated to the left by rotating the handle 49 or starting the stepping motor 93, the spline shaft 40 is rotated together with the ball spline 13, and at the same time, the spline shaft 40 is connected to one end of the ball spline 13. Joint member 1
14 are rotated at the same speed.

Subsequently, the rotation of the joint member 114 is transmitted to the hub-equipped rotor 109 via the key 113.

The rotor 109 with a hub can rotate freely by the rolling bearing 107 regardless of the annular excitation coil 105 of the dry single-plate electromagnetic clutch.

Therefore, the shaft 22 moves backward (to the right in the drawing) while being guided by the first screw 21 of the immovable first ball screw nut 20 (fixed to the housing 101).

When the shaft 22 reaches a predetermined position, the electromagnetic clutch is energized by the operation of a limit switch (not shown), and a magnetic flux is generated between the annular excitation coil 105, the hubbed rotor 109, and the first armature 125, and the first armature 125 is strongly attracted to the friction surface of the hub-equipped rotor 109, the clutch is connected by the friction force, and the intermediate joint member 120 is rotated in the same direction as the ball spline 13, that is, to the left.

By simultaneously rotating the non-movable first ball screw nut 20 and the shaft 22 together with the intermediate joint member 24, the shaft 22 neither moves forward nor backward, but since it is screwed into the second movable ball screw nut 66, Guided by the second movable ball screw nut 66, the shaft 22 is retreated to the right in the figure, and at the same time the second movable ball screw nut 66 moves forward to the left.

Next, when the current to the electromagnetic clutch is cut off and the dry single-plate electromagnetic brake is energized, the second annular excitation coil 130, the second field core 131, and the second rotor 132 are magnetized, and the second armature 128,
The intermediate joint member 120 and the first armature 125 are strongly attracted to the left, and the clutch is disengaged.

Therefore, the intermediate joint member 120 and the non-movable first
A brake is applied to the ball screw nut 20, and both rotations are momentarily stopped, and the first
The screw 21 is a non-movable first ball screw nut 20
guided and retreated.

As mentioned above, the rotation of the intermediate joint member 120 is driven and stopped by the electromagnetic clutch and the electromagnetic brake that are directly connected to the shaft 22, that is, the second movable ball screw nut and the third movable ball screw nut are switched between fast feed and slow feed. is done instantly.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the device of the present invention applied to slow-speed feeding of multiple tables of a machine tool, Fig. 2 is a partial cross-sectional front view of the ball spline of the device of the present invention, and Fig. 3 is a cross-sectional view of Fig. 1. , FIG. 4 is a longitudinal sectional view showing another embodiment of the device of the present invention. 10: Housing, 11: Nut case, 1
3: Ball spline, 20: Non-movable ball screw nut, 24: Intermediate joint member, 25: Sliding surface, 2
9: Joint member, 50: Knock pin, 66: Second movable ball screw nut, 71: Third movable ball screw nut.

Claims (1)

[Scope of Claim for Utility Model Registration] A feeding mechanism for a multiple table device that utilizes the pitch difference of screws, which satisfies the following conditions A, B, C, D, and E. (A) At least two or more screws 21, 65, 7
0, a plurality of movable ball screw nuts 66, 71 which are screwed into these screws 21, 65, 70 and match the pitch difference between the screws 21, 65, 70, and a non-movable ball screw. In a feeding mechanism for a plurality of table devices in which nuts 20 are screwed together, (B) one of the shafts 22 is formed with a spline 41 that fits into a ball spline; (C) the movable ball screw nut; 66 and 71 move forward or backward as the shaft 22 rotates, whereas the non-movable ball screw nut 20 moves the housing 10 by switching the clutch.
(D) The movable ball screw nut 66 and the movable ball screw nut 71 are each provided with a table 7.
(E) The screw 65 of one movable ball screw nut 66 is smaller than the pitch of the fixed ball screw 21, and the screw 70 of the other movable ball screw nut 71 is smaller than the pitch of the movable ball screw nut 66. It should be formed smaller than the pitch of the screw 65.