JPH0457642A - Long stroke feed unit - Google Patents

Abstract

PURPOSE:To apply the long stroke by utilizing a short screw rod by shifting a movable screw rod, together with a gear box, by the revolution of a fixed screw rod and advancing a table by a ball nut by revolving the screw rod at the same time. CONSTITUTION:When a motor is driven, a movable screw rod 13 turns a belt and a driving pulley 19, and a driven gear 9 is turned by the revolution of a driving gear 22, and a deformed sleeve 8 is shifted forwardly by l1 along a fixed screw rod 1, together with a gear box 7, and the movable screw rod 3 shifts in the axial direction by the equal stroke l1 to a ball nut 10 on the fixed screw rod side. A table 18 is screwed with the movable screw rod 13 through a ball nut 17, and since the shift in the longitudinal direction is set free through a longitudinal rail and turn is restricted, the table 18 is shifted forwardly relatively for the movable screw rod 13 by the distance l2 determined according to the lead, accompanied with the forward shift of the movable screw rod 13, and the table 18 obtains the stroke l3=l1+l2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a long stroke feed unit for machine tools and the like.

[Conventional technology]

For example, the length of the loading platform 01 of a large truck is about 5 m, and on both sides of the rectangular floor frame 02 surrounding the outer periphery, there are pairs of left and right panels that are about 5 m long, as shown in the partial cross-sectional view of Figure 4. Tilt plates 03 are pivotally attached via hinges 04 arranged at appropriate intervals. 05 is a chassis frame, 06 is a vertical joist, and 07 is a horizontal joist.

By the way, conventionally, in order to attach a plurality of hinges 04 to the floor frame 02, a considerable amount of time is required to drill a plurality of mounting bolt holes in the floor frame 02 at predetermined intervals.

Therefore, in order to streamline this drilling work, etc., it is desirable to attach the floor frame 02 to a movable platform with a long stroke, stop at each predetermined drilling position, and perform the drilling with a drill press. requires a moving device capable of providing a stroke of approximately 5 m.

However, as a moving device that provides a 5m stroke, a threaded rod of about 5m is required, and such long threaded rods are not available commercially, so we have to ask a specialized manufacturer to manufacture it as an order item. Therefore, the cost is extremely high.

By the way, short threaded rods of 2 to 3 m can be purchased at low cost as commercial products, so you can use these inexpensive short threaded rods to
If we can create a device that can give a long stroke of 5 m, using this device will reduce the cost of assembling truck beds, and will also expand the market for the relatively inexpensive 5 m long stroke feed unit itself. becomes.

[Problem to be solved by the invention]

The present invention was proposed in view of these circumstances, and has two
An object of the present invention is to provide a relatively inexpensive long stroke feed unit that can give a long stroke approximately twice the length by using an inexpensive short threaded rod.

[Means to solve the problem]

To this end, the present invention provides a fixed threaded rod whose front and rear ends are rotatably but not axially movably supported on the bed via fixed bearings, and one end of which is externally inserted near one end of the fixed threaded rod. a driven gear fitted into a sleeve coaxially fixed to a ball nut screwed onto the fixed threaded rod; and a movable threaded rod having a drive gear fitted near one end that meshes with the driven gear, and a common gear that is externally mounted near one end of the surface threaded rod via a bearing and includes the drive gear and the driven gear. A box, a ball nut that is screwed onto the movable threaded rod and which fixes a table that is movably supported only in the axial direction via a vertical rail supported by the bed, and one of the surface threaded rods. It is characterized by comprising a driving motor.

[Effect]

According to such a configuration, when the movable threaded rod is driven, the table advances in the axial direction relative to the movable threaded rod, that is, the gearbox, via the ball nut screwed into the movable threaded rod.

At this time, the driven gear rotates due to the rotation of the drive gear as the movable threaded rod rotates, which causes the ball nut threaded onto the fixed threaded rod to move forward through the sleeve, and at the same time, the gearbox moves through the sleeve. Advance axially relative to the bed.

Since the gearbox is common to both threaded rods, the movement of the gearbox moves the movable threaded rod metal body forward.

For convenience of explanation, the results of the operation of each member above will be summarized starting from the fixed threaded rod. When the gearbox strokes a distance Ri I due to the rotation of the fixed threaded rod, the movable threaded rod along with the gearbox also strokes a distance 11. At that time, the ball nut moves the table over a distance due to the rotation of the movable threaded rod via the drive gear that is linked to the rotation of the driven gear.
? Since the table advances relative to the movable screw rod by I i z, the table moves forward by 1 relative to the fixed screw rod, that is, the bed.
, +12 strokes.

〔Example〕

An embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is an overall side view thereof, Fig. 2 is a horizontal cross-sectional view showing the connection between the fixed threaded rod and the movable threaded rod in Fig. 1, and Fig. 3 is a FIG. 3 is a longitudinal sectional view showing the ball nut of FIG. 2;

First, in FIGS. 1 and 2, 1 has the front and rear bearings 2 and 2, respectively. A short threaded rod of about 3 m (hereinafter referred to as a fixed threaded rod) is rotatably supported on the bed 4 via a rear bearing 3, but its axial movement is restricted. 7 is a fixed threaded rod 1.
An irregularly shaped sleeve 8 having a common center hole spanning the rear ends of a movable threaded rod 13 (to be described later) and having a large diameter portion at the front end is pivotally supported via a pair of front and rear bearings. A driven gear 9 is fitted on the outer periphery. 10
A ball nut is fixed coaxially to the large diameter portion of the front end of the irregularly shaped sleeve 8 with seven flange bolts and is screwed onto the fixed threaded rod 1, and its internal structure is as shown in FIG.

A movable threaded rod 3 is arranged in parallel with the fixed threaded rod 1, and its front end is slidably supported in the longitudinal direction on a vertical rail 15 projecting from the bed 4 via a front slider bearing 14. The rear end portion is pivotally supported by a gearbox 7 supported by a vertical rail 15 via a rear slider bearing 16. 17
is a ball nut that is screwed onto the movable threaded rod 13, and has the same structure as the ball nut 10 of the fixed threaded rod 1, and a table 18 is attached to the upper end of the ball nut IT via a bracket. 19 is a drive pulley fitted to the rear end of the movable threaded rod 13 and driven by the motor 21 via the cogged belt 20; 22 is a drive gear fitted to the movable threaded rod 13 and meshes with the driven gear 9; It is included in box 7.

In such a device, when the motor 21 is driven, the cogged belt 20. Movable screw 1 via drive pulley 19
3 rotates, and the resulting rotation of the drive gear 22 causes the driven gear 9 to rotate, and the rotation of the driven gear 9 causes the deformed sleeve 8 to move forward along the fixed threaded rod 1 by ll along with the gear box 7.

Here, since the gearbox 7 is common to that of the movable threaded rod 13, the axial movement of the gearbox 7 is the same as the axial movement of the movable threaded rod 13, and the movable threaded rod 13 is the same as that of the movable threaded rod 13. It moves in the axial direction by the same stroke II as the ball nut 10.

Incidentally, the table 18 is screwed onto the movable threaded rod 13 via a ball nut 17, and is free to move vertically via the vertical rail 15, but its rotation is restricted. As the table 18 moves forward, it moves forward relative to the movable threaded rod 13 by a distance 12 determined by its lead, so the table 18 eventually moves toward the ball nut 10.
Stroke! , based on Stroke 1! = i
, + i , will be performed.

Incidentally, instead of the movable threaded rod, a fixed screw can be driven by a motor.

〔Effect of the invention〕

According to such a structure, the following effects can be achieved.

(1) Using two inexpensive short screw rods, it is possible to perform substantially the same effect as an expensive long screw rod, which makes a stroke approximately twice the length of the short screw rod.

(2) Compared to the case of using one long threaded rod, the feeding time is halved, so processing can be performed with high efficiency.

In short, according to the present invention, there is a fixed threaded rod whose front and rear ends are supported rotatably but not axially movable on the bed via fixed bearings, and a fixed threaded rod that is externally inserted near one end of the fixed threaded rod. a driven gear fitted into a sleeve whose one end is coaxially fixed to a ball nut screwed onto the fixed threaded rod;
a movable threaded rod that is arranged in parallel with the fixed threaded rod and is slidably supported in the axial direction with respect to the bed, and has a driving gear that meshes with the driven gear fitted near one end; a common gearbox that is externally mounted near one end of the rod via a bearing and includes the driving gear and the driven gear;
A ball nut that is screwed onto the movable threaded rod and fixes a table that is movably supported only in the axial direction via a vertical rail supported by the bed, and a motor that drives either one of the threaded rods. The present invention provides a relatively inexpensive long stroke feed unit that can provide a long stroke of approximately twice the length using two inexpensive short threaded rods. It is extremely useful for industry.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing one embodiment of the present invention, Fig. 2 is a horizontal cross-sectional view showing the interlocking relationship between the fixed threaded rod and the movable threaded rod in Fig. 1, and Fig. 3 is the bore bearing shown in Fig. 2. , 4... bed, 7.
・Gear box, 8 ・Irregular sleeve, 9 ・Driven gear, 10 ・Ball nut, 13 ・Movable threaded rod, 14 ・Slider bearing (front), 15 ・Vertical rail , 16... (rear) slider bearing, 17...
Ball nut, 18...Table, 19...Drive pulley,...Drive gear,...Cogged belt, 21
...Motor applicant Mitsubishi Motors Engineering Co., Ltd. Applicant
Mitsubishi Motors Corporation Representative Patent Attorney Masa Tsukamoto 4th

Claims (1)

[Claims] a fixed threaded rod whose front and rear ends are rotatably supported on the bed via fixed bearings, but not movable in the axial direction;
A driven gear is fitted into a sleeve that is fitted around one end of the fixed screw rod and is coaxially fixed to a ball nut whose one end is screwed into the fixed screw rod, and a driven gear that is installed in parallel with the fixed screw rod and is attached to the bed. A movable threaded rod is slidably supported in the axial direction, and a drive gear that meshes with the driven gear is fitted near one end of the rod, and a movable threaded rod is mounted near one end of both of the threaded rods via a bearing. a common gearbox that includes the driving gear and the driven gear; and a ball that is screwed onto the movable threaded rod and that fixes a table supported movably only in the axial direction via a vertical rail supported by the bed. A long stroke feed unit comprising a nut and a motor that drives either one of the threaded rods.