JPH05192872A - Clamping drive device - Google Patents

Abstract

PURPOSE: To change the effective length of both sleeves and to enable rotational movement operation of different sizes by cooperating inclined faces provided on a connecting sleeve and an adjusting sleeve with each other. CONSTITUTION: An adjusting sleeve 14 under the action of a second spring 13 is provided and a connecting sleeve 10 and the adjusting sleeve 14 are cooperated in inclined faces 15, 16. The adjusting sleeve 14 is non-rotatably arranged on a rotational spindle 5 at a selectable angle position. The second spring 13 has a spring force large than the spring force of a first spring 9 so as to thrust the adjusting sleeve 14 toward a stopper 17 on the rotational spindle 5. The effective length of the both sleeves is changed by the inclined faces 15, 16 and connecting members between the connecting sleeve 10 and the spindle are brought in contact with each other by threading of the rotational spindle 5 so as to restrict the rotational movement of the rotational spindle 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensioning drive, in particular for a vise, which has a spindle with an external thread for moving at least one tensioning jaw, the spindle being drivable. A rotary spindle, the rotary spindle entrains the spindle through a disengageable joint, and a screw and mechanical connection between the spindle and the rotary spindle are provided. A booster, which is adapted to increase the force with respect to the spindle during the axial screwing movement of the pivoting spindle and is arranged non-rotatably on the pivoting spindle. A coupling sleeve adjustable against the force of the first spring, the coupling sleeve having a coupling member for limiting the pivoting movement of the pivoting spindle relative to the spindle. Spindle about that of the corresponding format adapted to the connecting member and cooperating.

[0002]

2. Description of the Prior Art A tensioning drive of the type mentioned is known, for example, from German Patent 2,262,383. In such tensioning devices, it is necessary to adjust the maximum tensioning pressure that can occur. Some workpieces require a relatively high clamping pressure, which ensures that the workpiece is held. Such tensioning pressures are too high for other workpieces and can damage the workpiece. Due to the large transmission ratio in the tensioning drive with a mechanical booster, it is difficult to calculate the resulting tensioning pressure based on the resistance of the tensioning crank.

In the tensioning device that can be driven hydraulically,
The tensioning force is generated not by hand but by a servo system, and it is relatively easy to control the pressure regulation by the manometer circuit. However, because of the various advantages of mechanical boosters, it is desirable to also allow mechanical boosters to be accurately adjusted in relation to tensioning forces.

Although a tensioning drive of the type mentioned at the outset seeks to enable the aforementioned adjustments, it is cumbersome, multi-part and therefore expensive in construction.

[0005]

SUMMARY OF THE INVENTION The object of the invention is to improve a tensioning drive of the type mentioned at the outset such that the tensioning drive is easy to manufacture, simple and safe to use, and the individual components are of the greatest possible degree. It is to prevent it from being worn.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, according to the invention, an adjusting sleeve under the action of a second spring is provided in a tensioning drive of the type mentioned at the outset, which comprises a connecting sleeve and an adjusting sleeve. And cooperating with an inclined surface, the adjusting sleeve is arranged on the pivoting spindle in a non-rotatable but selectable angular position, the second spring being the first spring. Has a spring force which is greater than the spring force of the control sleeve and pushes the adjustment sleeve towards the stop on the pivot spindle.

[0007]

With the above-described construction of the invention, the number of components is reduced and only two sleeves are provided, namely the connecting sleeve and the adjusting sleeve, both sleeves being of suitable construction. And are pressed together by springs. The inclined surface changes the effective length of both sleeves in the case of relative rotation of both sleeves, allowing different sizes of rotational movement,
The connecting member between the connecting sleeve and the spindle terminates the feed movement of the rotary spindle and thus the adjustment of the booster.

Advantageously, the spindle is embodied as a hollow spindle and receives the pivoting spindle and the connecting sleeve.

In another aspect of the invention, the adjusting sleeve is disengaged from the entrainment device of the pivoting spindle against the force of the second spring for adjusting the adjusting sleeve. The same member, the spring holding the adjusting sleeve and the connecting sleeve together, is also used for adjusting the adjusting sleeve.

Furthermore, in the arrangement according to the invention, the adjusting sleeve projects at least partially from the drive-side end of the hollow spindle. This allows the adjusting sleeve itself to be operated directly, in particular without tools. In this case, the adjusting sleeve preferably has a gripping surface.

In still another configuration of the present invention, the driving-side end of the rotary spindle is configured as a polygonal portion,
The polygon is used both to prevent rotation of the connecting sleeve and the adjusting sleeve and for the tensioning crank. Such a structure greatly simplifies fabrication. The polygonal part is formed in one working step in the embodiment and is used for various purposes.

Furthermore, in the arrangement according to the invention, a cylindrical section is provided in the region of the polygonal part of the pivot spindle, which section is connected to the polygonal part section for preventing rotation of the adjusting sleeve. The adjusting sleeve is movable with the polygonal section against the force of the second spring.

The drive-side end of the hollow spindle is preferably constituted by a sleeve fitted in a part of the hollow spindle, which sleeve encloses the connecting sleeve and partly also the adjusting sleeve. is there. Such a structure provides space for placement and assembly of the connecting sleeve and the adjusting sleeve. Particularly advantageously, the end of the sleeve-inserted part of the hollow spindle carries a connecting element for limiting the pivoting movement of the pivoting spindle. In this way, the connecting member can be easily manufactured and processed.

[0014]

1 and 2 show one vise,
This vise clamps two workpieces at the same time. One work piece is clamped between jaws 4 and 25,
And another workpiece is clamped between the jaws 3 and 26.
In this case, the jaws 25 and 26 are fixedly arranged on the vise main body 27, while the jaws 3 and 4 are held by the sliders 28 and 29, respectively, and the sliders are inserted via the female screw portions 30 and 31. Split hollow spindle 1,
It is designed to cooperate with 33 male screws 2 and 32.

The use of the means according to the invention for multiple tightening is to be understood as an example,
The invention is easily used exclusively for vices with one fixed jaw and one movable jaw, or for a centering tensioning device with two movable jaws that can be moved symmetrically to each other.

The tensioning drive according to the invention comprises a hollow spindle 1 and a rotary spindle 5 arranged in this hollow spindle. The disengageable coupling 6 comprises, as is known per se, a spring-loaded sphere 34, which can be partially pushed into the bore 35 of the hollow spindle. Here, two spheres 34 and two holes 35 are provided to ensure the required torque that can be transmitted.

The rotating spindle 5 is rotated by a tensioning crank 20 mounted on a polygonal portion 40 at the right end in the drawing, and the hollow spindle 1 is entrained via a joint 6 during this rotating movement. To be done. Male screws 2, which are opposite to each other
The slider is moved with the movable jaws 3, 4 via 32.

On the upper side of the predetermined torque, the spherical body 34 is pushed out from the hole 35 against the force of the joint spring, and the rotary spindle 5 rotates without entraining the hollow spindle 1.

Due to the screw 7 between the pivoting spindle and the hollow spindle, a booster 8 is provided during the subsequent pivoting movement.
A pressure is generated in the pressure roller 36, and the wedge-shaped pressure pin 36 spreads the pressure pieces 38 and 39 through the pressure roller 37. Both parts 1, 33 of the hollow spindle are pushed away from each other.

As is particularly apparent from FIG. 5, the drive-side end of the rotary spindle 5 has a polygonal structure, which also has polygonal section sections 44, 18, 40. A cylindrical section 21 is arranged between the polygonal section 18 and the polygonal section 40, the diameter of which corresponds to the spanner width of the polygonal section.

The polygonal sections are secured rings 41, 42, 4
It has a total of three notches for receiving 3.

The retaining ring 41 defines a polygonal section 44 for the connecting sleeve 10. Connecting sleeve 10
Under the action of a first spring 9, which is supported by a retaining ring 50, which is also arranged in the groove of the pivot spindle. The first spring 9 pushes the connecting sleeve 10 towards the retaining ring 41.

The connecting sleeve 10 has a connecting member 11 at the end facing the spring 9, and the connecting member cooperates with the connecting member 12 of the hollow spindle 1.
The connecting members 11, 12 are constructed identically to each other and may have a projecting shape, for example as shown in FIG. A member such as a claw clutch may be provided,
In this case, each member is supported only in one rotation direction. The rotation direction is defined by the lead of the screw 7.

Claw-shaped or protruding clutch members are not essential. The connecting sleeve 10 may be adapted to contact the end face of the hollow spindle component 1 with a simple flat end face. It is also possible to arrange the inclined surface as a connecting member. However, it is preferably a member which acts on tangential movements, since the position of the connecting sleeve 10 cannot be changed during wear.

The end of the connecting sleeve 10 on the drive side is provided with an inclined surface 15. This inclined surface advantageously has a uniform pitch extending over substantially the entire circumference. Corresponding to the inclined surface 15 of the connecting sleeve, the same inclined surface 1 is formed.
6 is provided on the adjusting sleeve 14, both ramps being in intimate contact with each other in one position as shown in FIG. In this position, the overall axial length of the connecting sleeve 10 and the adjusting sleeve 14 is minimal.

FIG. 4 shows the development of the inclined surface 15 or 16.

While the inclined surface 15 or 16 extends over substantially the entire circumference, the connecting member 11 or 12 is formed.
Are preferably provided several times, in particular two or three times.

The adjusting sleeve 14 is acted upon by the second spring 13. The second spring 13 is surrounded by an adjusting sleeve 14 and is supported on one end by a step of a stepped hole inside the adjusting sleeve 14 and on the other drive side end by a seal 51. And the seal itself is in contact with the securing ring 43.

A gripping surface 19 or groove or similar means is provided on the outer periphery of the adjusting sleeve 14 to facilitate gripping and pivoting of the adjusting sleeve 14. For adjustment of the adjusting sleeve 14, the adjusting sleeve is pulled towards the drive-side end and the polygonal section 22 of the adjusting sleeve 14 is driven out of the polygonal section 18 of the pivot spindle. The adjusting sleeve 14 is then swiveled into the desired position and, after release, is returned again into the polygonal section 18 under the action of the second spring 13.

By proper rotation of the adjusting sleeve 14,
The inclined surfaces 15 and 16 are no longer in contact with each other over the entire circumference, but only over a part of their circumference. Therefore, the required space between the adjusting sleeve and the connecting sleeve, which are in contact with each other, becomes large. Since the second spring 13 is stronger than the first spring 9, the adjustment sleeve 1
4 is a stopper 1 always formed by the retaining ring 42
7 towards the end, so that at the beginning of the screwing movement of the pivoting spindle in the screw 7 both connecting members 1
The interval S (see FIG. 5) between 1 and 12 is smaller than the maximum interval. This means that depending on the adjustment of the adjusting sleeve 14, only a slight rotational movement takes place before the coupling members 11 and 12 cooperate. A slight pivoting movement (spacing S) means that the pressure pin 36 is pushed only slightly between the pressure rollers 37 and thus the booster exerts only a slight maximum force.

A shim plate may be attached to the stopper 17 for adjustment. Therefore, the manufacturing error in the axial direction of the spindle portion and the adjusting portion does not become a problem.

The desired adjustment position of the adjusting sleeve 14 may be identified by a mark on the end face or end face of the adjusting sleeve 14, which mark is aligned with the mark on the polygonal section 44.

A sleeve 23 is inserted in the portion 24 of the hollow spindle 1, which sleeve also forms part of the hollow spindle. Hollow spindle part 2
There is a screw between the screw 4 and the sleeve 23, the screw being screwed into the part 24, the head of the screw being received by the hole 46. This eliminates relative rotation of the sleeve 23 and the portion 24. Sleeve 2
3 is supported by a ball bearing 47, and the ball bearing is supported by a mounting addition portion 49 of the machine frame 27 via a disc spring unit 48. The sleeve 23 surrounds and guides the connecting sleeve 10 and the adjusting sleeve 14 and is held by a ring 45 screwed onto the sleeve end. In this way, the adjusting sleeve 14 is attached to the attachment adding portion 4
9. Provide additional guidance and support.

[Brief description of drawings]

FIG. 1 is a sectional view of a left side portion of a vise.

FIG. 2 is a sectional view of the right side portion of the vise.

FIG. 3 is an end view of the right end of the tension drive.

FIG. 4 is a development view of an inclined surface of a connection sleeve or an adjustment sleeve.

5 is an enlarged cross-sectional view of the tensioning device shown in FIG.

FIG. 6 is an enlarged cross-sectional view of another embodiment of the tensioning drive device.

[Explanation of symbols]

1 Hollow Spindle, 2 Male Thread, 3,4 Jaw, 5 Rotating Spindle, 6 Joint, 7
Screw, 8 booster, 9 spring, 10 connecting sleeve, 11, 12 connecting member, 13 spring,
14 adjustment sleeves, 15 and 16 inclined surfaces,
17 Stopper, 18 Polygonal Section, 19
Grip surface, 20 tension crank, 22 polygonal section, 23 sleeve, 24 section, 2
5,26 jaws, 27 machine frames, 28,
29 slider, 30, 31 female screw part, 32 male screw, 33 hollow spindle, 34 spherical body,
35 holes, 36 pressure pins, 37 pressure rollers

Claims (9)

[Claims] 1. A tensioning drive, in particular for a vise, comprising a spindle with external threads for moving at least one tensioning jaw, the spindle being driven by a rotatable spindle. The rotary spindle entrains the spindle via a disengageable joint, and has a screw between the spindle and the rotary spindle and a mechanical booster. The booster device is adapted to increase the force with respect to the spindle during the axial screwing movement of the pivot spindle, which is arranged non-rotatably on the pivot spindle. A connecting sleeve which is adjustable against force, the connecting sleeve comprising a connecting member, which is adapted to limit the pivoting movement of the pivoting spindle relative to the spindle. Adjusting sleeve (14) under the action of a second spring (13), the connecting sleeve (10) and the adjusting sleeve (14). And are inclined surfaces (15,
16) and the adjusting sleeve (14) is arranged on the pivoting spindle (5) in a non-pivotable but selectable angular position, the second spring ( 13) has a greater spring force than the spring force of the first spring (9) and pushes the adjusting sleeve (14) towards the stopper (17) on the pivot spindle (5). Tightening drive device. 2. The tensioning drive according to claim 1, wherein the spindle (1) is embodied as a hollow spindle and receives the pivoting spindle (5) and the connecting sleeve (10). 3. The adjusting sleeve for adjusting the adjusting sleeve (14) is disengaged from the entrainment device (18) of the pivoting spindle (5) against the force of the second spring (13). The tightening drive device according to claim 1 or 2, wherein: 4. The tension drive according to claim 1, wherein the adjusting sleeve (14) projects at least partially from the drive-side end of the hollow spindle (1). 5. The adjustment sleeve (14) has a gripping surface (19).
The tension drive device according to any one of claims 1 to 4, further comprising: 6. The end on the drive side of the rotary spindle (5) is configured as a polygonal part, the polygonal part (44,1).
The tightening crank (20) also prevents the connecting sleeve (10) and the adjusting sleeve (14) from rotating.
6. The tensioning drive device according to claim 1, which is also used for. 7. A cylindrical section (21) is provided in the region of the polygonal part of the pivot spindle (5), said section being for preventing the pivoting of the adjusting sleeve (14). 1
8), wherein the adjusting sleeve (14) is movable by means of a polygonal section (22) against the force of the second spring (13). The tightening drive device according to the item. 8. The drive-side end of the hollow spindle (1) is constituted by a sleeve (23) fitted in a part of the hollow spindle, which sleeve (23).
8. The tensioning drive according to claim 2, wherein the housing surrounds the connecting sleeve (10) and also partially surrounds the adjusting sleeve (14). 9. The hollow spindle sleeved part (24) at the end carries a coupling member for limiting the pivoting movement of the pivoting spindle (5).
9. The tightening drive device according to any one of 1 to 8.