DE973031C - Slipping clutch arrangement for reels working within a large torque or band tension range - Google Patents

Description

Slipping clutch arrangement for within a large torque or range Tape tension area working reel The invention aims at the tape tension at Winding devices driven by a slip clutch in a very wide range. Limits to make adjustable.

The coupling parts of the slip clutches of tape reels are mostly conical and provided with a friction lining. They come with an adjustable Force pressed against each other and generate a torque proportional to the contact force, which is transferred to the reel shaft. To ensure smooth working, becomes the pressure force that can be changed, in particular regulated, according to the band diameter Via springs by means of a handwheel and threaded spindle by compressed air or some other resilient device Element generated. In the area of the small belt tension, i. H. the small torque, But such a clutch still works too hard, i. H. too irregular and with strongly changing tape tension. This is due, among other things, to the fluctuations in the Friction coefficient at a very low relative speed of the two coupling parts here. The result is jerky work.

In order to achieve the goal stated at the beginning, it has become known To use slip clutch assemblies for tape reels that consist of several, individually or can be switched on in parallel between the reel drive and the reel shaft There are individual couplings in conical design.

In addition, a slide drive for tape reels with two individually or mutually indentable as well as with regard to their largest diameter same, but with regard to their cone angle different cone couplings than known provided that through the coupling with the small cone angle large and a smaller torque can be transmitted with the large cone angle is. Even if with this arrangement the control of a larger belt tension range is made possible, but provides the following described and claimed combination a further expansion of the impermissible without accepting Strip tension fluctuations that can be covered.

It is also, for example, in vehicle coupling lungs that only When engaging and disengaging, it has become known that the upper clutch disc is concentric to subdivide and grasp the individual rings from the inside out when coupling to leave, or nested, in terms of their diameter, not but their cone angle differently sized and parallel switchable cone clutches roughly in the manner of the first part of the invention described below Solution to use; However, this was merely the one that deviated from the subject matter of the invention Task based on a smooth start z. B. one On the other hand, it is a solution in the sense of the present Task, namely to expand the torque range of the clutch; not to be found.

With the known slip clutch arrangements, the reel can cover a large belt tension and torque range, even with small ones Working torques smoothly and without jolts. In contrast, there is now the task at hand Invention is to achieve a further increase in the tape tension range without impermissible strip tension fluctuations must be accepted.

This object is achieved in that the two cone couplings different in a manner known per se with simultaneous nesting Have diameter, d. H. as a coupling with a large diameter for transmission a large torque and as a coupling with a smaller diameter compared to this are designed to transmit a small torque, and that in a known manner the clutch intended to transmit a large amount of torque has a small cone angle has, and vice versa =.

There is an advantageous embodiment of the subject matter of the invention in that the two couplings are arranged coaxially, a common housing having friction surfaces arranged in this and those of the engagement and disengagement device acted on the large clutch disc via a spring on the small clutch disc acting shifting.

Finally, there is another feature in the use of a clutch to drive a tape reel, which is cut with a strip cutter that cuts the material lengthways cooperates, which works either as pulling shears or as driven shears.

With this solution according to the invention, each of the two cone couplings experiences an optimal design for mastering the torque range assigned to it. The solution consists of a combination of features that are in the sense of a complementary objectives of the same kind, thereby completing the task at hand is solved in a surprisingly simple manner.

The housing part 1 of the couplings is a hollow shaft on one side formed through which a shaft? is passed. The possibly off housing part consisting of several pieces is provided with two inner cones. On the Shaft: 2 the small friction cone 3 is arranged to be displaceable. He's got a dull one Taper angle, which means that the torque that can be transmitted is low in relation to the contact force is. The shaft of the small friction cone 3 carries the large friction cone 4, the one possesses acute cone angle, whereby the transmittable torque in relation to Pressing force is great.

The two friction cones 3 and 4 are pressed apart by a spring 5. The spring 5 is pretensioned by the nuts 6 to such an extent that upon movement Of the two friction cones, the small friction cone works first and the large one still works a few Has millimeter play. If the contact force is greater than the preload of the spring, the large friction cone also works, i. H. both clutches then work together.

On the one hand, this slip clutch is used to transmit large torques suitable, on the other hand it also works with small belt pulls, i. H. with small ones Torques, still very accurate.

With an appropriate design, this coupling can also be used with the small Friction cone as a slip clutch and with the large friction cone as a disengageable friction clutch work. This is e.g. B- when cutting tape lengthways, d. H. with strip scissors desired, who have to work either as pull shears or as driven shears.

In the first case, the reel must handle the material to be cut with a high torque pull through the scissors, the drive of the scissors with this via an overrunning clutch connected is. In the other case, the reel must be under when the scissor knife is driven only loosely wind the food to be sliced with a small torque.

Claims 2 and 3 are real subclaims.

Claims (3)

PATENT CLAIMS: i. Slipping clutch arrangement for a reel working within a large torque or band tension range, which consists of two individual clutches in conical design, of which, depending on the torque to be transmitted, one alone or both in parallel initiate the power flow from the drive into the reel shaft characterized in that the two conical clutches (1, 3, 4) have different diameters in a manner known per se while nesting one inside the other, ie as a clutch with a large diameter (1, 4) for transmitting a large torque and as a clutch with a smaller diameter compared to this ( 1, 3) are designed for transmitting a small torque, and that, in a known manner, the coupling (1, 4) intended for transmitting a large torque has a small cone angle and vice versa. 2. Coupling according to claim 1, characterized in that the two clutches (1, 3, 4) are arranged coaxially have a common housing (1) with friction surfaces arranged therein and the large clutch disc acted upon by the engaging and disengaging device (4) has a sliding effect on the small clutch disc (3) via a spring (5). 3. The use of a coupling according to claims i and 2 for driving a tape reel which cooperates with a strip shears which sever the material longitudinally and which work either as pull shears or as driven shears. Considered publications: German Patent Specifications Nos. 856 721, 191 045, 1619o8; German patent application p 39104 Ibl7a (published April 24, 195: 2).