I claim:
1. A work holding tool system, comprising:
a. a primary base member having a plurality of evenly-spaced-apart peg openings;
b. at least one flexible arm member including a plurality of longitudinally aligned, interlocking ball-and-socket joint segments enabling said flexible arm member to be twisted and disposed at different angles, said flexible arm member including an upper end joint segment and a lower end joint segment;
c. an adjustable part holder attached to said upper end joint segment of said flexible arm member; and,
d. a peg opening attachment means attached to said lower end joint segment for selectively attaching said flexible arm to one of said peg opening on said base member.
2. The work holding tool system, as recited in claim 1, further including a panel member attached to said primary base member.
3. The work holding tool system, as recited in claim 2, wherein said panel member is removably attached to said base member.
4. The work holding tool system, as recited in claim 1, further including a secondary base member perpendicularly aligned and attached to said primary base member, said secondary base member having a plurality of evenly-spaced apart peg openings.
5. The work holding tool system, as recited in claim 4, wherein said secondary base member includes a pair of longitudinally aligned legs that fit into said pair of peg openings formed on said primary base member to hold said secondary base member in a perpendicularly aligned position on said primary base member.
6. The work holding tool system, as recited in claim 1, wherein said peg opening attachment means is an elastic bushing that fits snuggly into said peg opening.
7. The work holding tool system, as recited in claim 6, further including means for adjusting the cross-sectional area of the bushing to adjust the fitting inside said peg opening.
8. The work holding tool system, as recited in claim 4, further including a panel member attached to said primary base member.
9. The work holding tool system, as recited in claim 1, wherein said adjustable part holder is a clamp.
10. A work holding tool system, comprising:
a. a primary base member having a plurality of evenly-spaced-apart peg openings;
b. at least one flexible arm member including a plurality of longitudinally aligned, interlocking ball-and-socket joint segments enabling said flexible arm member to be twisted and disposed at different angles, said flexible arm member including an upper end joint segment and a lower end joint segment;
c. an adjustable part holder attached to said upper end joint segment of said flexible arm member wherein said adjustable part holder is a clamp;
d. a peg opening attachment means attached to said lower end joint segment for selectively attaching said flexible arm to one of said peg opening on said base member wherein said peg opening attachment means is an elastic bushing that fits snuggly into said peg opening; and,
e. a panel member attached to said primary base member.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Method for operating an electromotive drive, in particular a single drive of a textile machine, comprising a contactlessly mounted rotor (1), catch bearings (10), wherein the rotor (1) rests on one of the catch bearings (10) prior to initial operation of the electromotive drive, and from which the rotor (1) is spaced apart during stationary operation by a bearing air gap, as well as a control device, which comprises a position sensor (11) and at least one actuator coil (5) and which allows the rotor (1) to be held in a force-free floating state during stationary operation wherein the rotor floats axially about a working point, characterized by the following steps:
inputting an output signal (ASI) generated by an integrator (15) of the control device for maintaining the force-free floating state during operation;
calculating the bearing air gap by evaluating the output signal (ASI);
comparison of the calculated value for the bearing air gap with predeterminable limit values;
switching off the electromotive drive when the limit values are passed.
2. Method according to claim 1, characterized in that before starting up the electromotive drive, to fix limit values, the catch bearing stops are measured to determine the extreme values of the bearing air gap to fix limit values.
3. Method according to claim 2, characterized in that the predeterminable limit values are established below the extreme values determined.
4. Method according to claim 1, characterized in that after each time the electromotive drive is switched off, the measurement of the bearing stops is carried out before the electromotive drive is started up again.
5. Method according to claim 1, characterized in that before the run-up of the rotor (1), a reference value of a working point of the rotor (1) in the floating state is determined, so a deviation of a working point adjusted during stationary operation from this reference value is determined.
6. Method according to claim 5, characterized in that the reference value is determined from the average value of the catch bearing spacings.
7. Method according to claim 5, characterized in that the reference value of the working point of the rotor (1) in the floating state is predetermined when the rotor (1) has reached its operating speed.
8. Method according to claim 5, characterized in that the switching off of the electromotive drive is brought about by a defined deviation of the working point adjusted in each case in stationary operation from the reference value.
9. Method according claim 1, characterized in that the output signal (ASI) is linearised for small bearing air gaps.
10. Method according to claim 1, characterized in that to evaluate the output signal (ASI), the control device is in operative connection with a control arrangement.
11. Method according to claim 10, characterized in that to amplify the output signal (ASI), the control arrangement has a differential amplifier (16).
12. Method according to claim 11, characterized in that the input of the differential amplifier (16) is loaded with an additional pulse width-modulated signal, which is produced by the control arrangement.
13. Method according to claim 12, characterized in that to compensate the deviations occurring during the transition of the operating state of the electromotive drive from the time of the run-up until the stationary operating state is reached, from the state of equilibrium in the floating state of the rotor (1), the pulse width modulation of the signal is changed with a time delay.
14. Electromotive drive, in particular for a textile machine, comprising a contactlessly mounted rotor (1), catch bearings (10), wherein the rotor (1) rests on one of the catch bearings (10) prior to initial operation of the electromotive drive, and from which the rotor (1) is spaced apart during stationary operation by a bearing air gap, as well as a control device, which comprises a position sensor (11) and at least one actuator coil (5) and which allows the rotor (1) to be held in a force-free floating state during stationary operation wherein the rotor floats axially about a working point, characterized in that the position sensor (11) has with at least one sensor coil (87), the at least one actuator coil (5) is can be provided with, electrical energy in a defined manner, the control device further comprises a position controller (12) and an integrator (15), at which an output signal (ASI) is picked up, the control device is connected to a control arrangement to evaluate the output signal (ASI) and calculate the bearing air gap and the control arrangement is set up to compare the calculated value for the bearing air gap with predeterminable limit values and to switch off the electromotive drive when the limit values are passed.
15. Electromotive drive according to claim 14, characterized in that the control arrangement comprises a digital control unit (18).
16. Electromotive drive according to claim 15, characterized in that the control arrangement comprises an amplifier (16), an analoguedigital converter (17) and a digitalanalogue converter (19), via which the control unit (18) can be connected to the control device.
17. Electromotive drive according to claim 14, characterized in that for contactless mounting of the rotor (1), the mounting is designed as a magnetic bearing arrangement.
18. Electromotive drive according to claim 14, characterized in that for contactless mounting of the rotor (1), the mounting is designed as a combination of a magnetic and a gas bearing arrangement.
19. Electromotive drive according to claim 14, characterized in that the rotor (1) is designed as a spinning rotor.
20. Electromotive drive according to claim 14, characterized in that the drive is designed as a drive for a rotor spinning machine.