JPS5823946A - Apparatus for pulling material of knitted fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a knitting material take-up device.

Regarding the removal of thread-like, rope-like, ribbon-like or tubular materials from machines that produce or process these materials, e.g. knitted fabrics produced on flat knitting machines or circular knitting machines, positive drive type, friction drive type and positive/friction type Drive-type take-off devices are known. These take-off devices are commonly used to take off production or process material under as constant a tension as possible and feed it to a receiving tank or winding device.

The automatic adaptation to fluctuations in the amount of material is achieved by a take-off device (German patent specification) with a positive drive or a friction drive when it consists of alternating use of two opening and closing pawls of a pawl drive. 1/!;/, /9'1) or a friction wheel (German Patent Application No. 211
This can only be achieved using a pull-off device with a slip clutch, such as a disc clutch, for example, with a hysteresis clutch (German Patent Application No. 320g No. 3) or a hysteresis clutch (German Patent Application No. 23307!; No. 2). In disc clutches, the friction wheels are subject to severe wear, and when the material to be picked up or the parts used for pickup stops, the friction wheels rotate counter-rotating at a high relative speed, while the torque of the hysteresis clutch can only be changed by a mechanical lever mechanism. However, it is relatively time-consuming and difficult to automatically control torque.

Therefore, instead of a slip clutch, a rotating magnetic field type electric motor, a gear rotating electromagnet, or a DC motor is provided as the drive device for the take-up roll, and the torque is controlled by moving the idle rotor, controlling the rotating electromagnet, or controlling the current supplied to the DC motor. It is also already known to do so (German Patent Specification No. 1θ7A3//;
Publication Specification No. 2A3/123). However, this type of drive is still expensive and does not always work satisfactorily.

The object of the invention is to improve a collection device of the type mentioned at the outset,
To operate satisfactorily under all conditions of use, to be inexpensive, and to be able to drive the take-off roll with constant torque over the entire speed range from zero to the required maximum rotational speed even when the material quantity fluctuates. It is.

This object is achieved by the features of patent claim 1.

The invention has the advantage that the output torque of the eddy current clutch is virtually independent of the output speed over a wide range, especially at low speeds. In the most frequent case (when the bow roll speed is in this low speed range, a constant torque is applied to the take-off rollers, independent of the material quantity. An inexpensive knitting material take-up device can be manufactured.

Further advantageous features of the invention are set out in the dependent claims.

Figure 7 shows a flat knitting machine (for example, German Patent Publication Specification Letter 2!;
3/71.2) is an example. The take-off roller has an axle which is rotatably supported on bearings 3 and which has at its end a belt wheel, a chain wheel, gears, etc.

The belt wheel is connected to a belt wheel 6, a chain wheel, gears, etc. by a belt 5, a chain, etc. The belt wheel 6 is attached to the driven shaft 7 of the reduction gear g, and the drive shaft 9 of the device is connected to the driven part lo (FIG. 1) of the eddy current clutch /l. In particular, as shown in Figure 2, the drive section of the eddy current clutch //
is coupled to the driven shaft /3 of a three-phase AC motor /q, which motor is connected to a power supply and driven in the well-known and schematically illustrated manner.

The excitation coil 15 of the eddy current clutch // is connected to a stable current/voltage source /A, the output voltage of which is determined by a voltage divider /
You can change it with 7.

Figure 1 shows details of the eddy current clutch or electromagnetic clutch. In particular, the drive part 12 has a pole piece/piece which protrudes in the axial direction.
It also consists of a pole wheel or rotor with g, the pole pieces facing the air gap, and on the opposite side of the air gap a stator /9 is provided, which stator has a fixed annular excitation coil /S. Furthermore, a rotatably mounted armature or clutch plate is provided in the cavity, the armature being connected to a driven part IO rotatably mounted in a bearing 22. The drive part 2 and the stator 19 are made of ferromagnetic material, but the armature J is made of a non-magnetic material with high electrical conductivity. Stator/9 has its base metal housing 23
and the housing has a radially inwardly directed projection at the distal end on the underside of the drive part. This protrusion is the stator/
9 serves to fix the three-phase motor/41 in the radial and axial directions. The housing 23 acts as a ground for the magnetic flux indicated by the dashed line 25, and for this reason the housing 23
and the outer surface of the drive part 12.

The eddy current clutch works as follows.

When the excitation coil /S is excited by the application of voltage, the stator /9, the housing 23, and the drive unit /S correspond to the broken line 25.
A complete magnetic flux is generated through J and armature J. At this time, when the drive section /2 is driven by a three-phase AC motor /41 at a constant speed, for example, the magnetic flux is modulated by the armature 20, eddy currents are induced, and magnetic force is generated on the armature circumferential surface. This magnetic force produces a torque, and therefore the armature I
It will also accelerate the The speed in this case depends on the air gap flow, ie the excitation current, but the generated torque is almost independent of the speed. By changing the excitation current using the voltage divider 17, the speed can be changed while keeping the torque constant. The driven part 10 can be stopped without adversely affecting the drive device.
The speed of q is 2g00rpm in the illustrated example, and the speed of
- The slip becomes very large when the speed of roller 7 is only slightly lower.

Eddy current clutches of this kind are known (e.g. Swiss Patent Specification No. 707/), e.g. Lowestoft (
Manufactured by Pye Electric Co., Ltd. (UK), Eugen Schmidt & Co.
o), Gatriba & Anne) League Selement G.M.P.O. Bar 1 (5210 Troistork, Germany) to product name
series). The diagram in FIG. 3 shows the relationship between the output torque and output speed of this company's "task unit 6D2/2."

As shown in Figure 3 (output torque is, for example, A7% of the rated current)
In the case of , there is virtually no change in the speed range from zero to 1000 revolutions. This property is exploited for the purposes of the present invention.

If the knitting speed, material quantity, knitting strength and dimensions of the take-off roll of the flat knitting machine are standard, the speed of the take-off roll is, for example, between zero and the maximum lIr pm.

This speed range is ykps when using the eddy current clutch shown in Figure 3 and when driving the three-phase motor/4' at a constant speed.
Provides constant output torque around cm. This output torque is generally insufficient, since a torque of, for example, 40 kp*cm is normally required.

In this case, in order to avoid the need for an excessively powerful and expensive three-phase electric motor and an excessively powerful and expensive eddy current clutch, the present invention sets the reduction gear system to a reduction ratio of /:12, and Despite the use of the eddy current clutch shown in FIG. 3, a torque of 60 kpa cm, which is 72 times higher, is generated on the take-off roll l. Under these conditions, in order to obtain the maximum speed of the take-up roll urpm, the driven part 10 must be driven at 7.2 times the output speed, llgrpm.
However, this speed increase has virtually no effect on the output torque (as FIG. 3 clearly shows), since even at this output speed the output torque is still constant.

With an eddy current clutch of the type described above, it is therefore not only possible to drive the take-off roll with constant torque even in the high speed range, but it is also possible to use particularly small, commercially available, and therefore inexpensive components.

The torque can be adjusted steplessly between zero and the maximum value by means of the voltage divider/7. If programmable control of torque is desired, multiple voltage dividers set to different output voltages,
and an electrical device for switching from one voltage divider to another, controlled by a computer, film or the like.

[Brief explanation of drawings]

1 is a schematic diagram of a preferred embodiment of the invention; FIG. 2 is an embodiment of the eddy current clutch shown schematically in FIG. 1;
The figure shows the torque-speed P line of the eddy current clutch of FIG. L...Take-up roll Co...Shaft 3...Bearing...Belt wheel s@Fist belt Hexagonal belt wheel 7...
Driven shaft ° g-・Reduction gear, q-・Drive shaft /θ・・
Driven part 7] Eddy current clutch /2 Drive part /311 Driven shaft /41 Three-phase AC motor
15... Excitation coil 16... Power supply /7... Ticket pressure machine
/E...pole piece/? ... Stator 20 ... Armature
22...Bearing 23...Housing Patent applicant: Sulzer Morato G.M.B.
Bar agent Masatsugu Suzuki

Claims (1)

[Scope of the Claims] l At least seven take-up loops connected to a drive device, for example a three-phase alternating current motor, via interposed slip clutches for producing thread-like, rope-like, ribbon-like or tubular materials or In the take-off equipment that takes these materials from the processing machine, the slip clutch is an eddy current clutch (//)
A knitting material take-up device comprising: The driven part (10) of the overcurrent clutch is connected to the reduction gear device (
knitted material according to claim 1, characterized in that it is connected to the drive shaft (9) of f) and the driven shaft (7) of the reduction gear is connected to the take-up roll (1). Collection device. 3. According to claim 7 or 2, the slip clutch is constituted by an eddy current clutch whose output torque is substantially constant within a range including zero output rotational speed. knitting material take-up device