CA1214050A - Linear driving arrangement with two motors - Google Patents
Linear driving arrangement with two motorsInfo
- Publication number
- CA1214050A CA1214050A CA000435180A CA435180A CA1214050A CA 1214050 A CA1214050 A CA 1214050A CA 000435180 A CA000435180 A CA 000435180A CA 435180 A CA435180 A CA 435180A CA 1214050 A CA1214050 A CA 1214050A
- Authority
- CA
- Canada
- Prior art keywords
- arrangement according
- linear driving
- driving arrangement
- motors
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
ABSTRACT OF THE DISCLOSURE
The linear driving arrangement operates with two motors disposed on the outer end of two casing members which are telescopically slidable into one another and secured against rotation. One motor drives a nut via a hollow coupling element and the other motor drives a screw spindle.
With this construction a driving arrangement which is compact and closed in itself is obtained.
The linear driving arrangement operates with two motors disposed on the outer end of two casing members which are telescopically slidable into one another and secured against rotation. One motor drives a nut via a hollow coupling element and the other motor drives a screw spindle.
With this construction a driving arrangement which is compact and closed in itself is obtained.
Description
The present invention relates to a linear driying arrangement having two motors, one motor driving a nut and the other ~otor driving a screw spindle. Compared with a driving arrangement operating with only one motor, which, for example, drives the spindle, the present arrangement has the advantage of a much larger adjustment range for the feed rate.
A slugyish, very slow feed can be attained when the ~wo motors have the same sense of rotation but are run with a small difference in speed. A fast feed can be attained when only one motor is operated and the other motor is at a standstill. Finally a very fast feed can be attained when the motors are oppositely run.
US Patent 2,630,022 discloses a linear driving arrangement with two motors in an open-type construction. The motor axles extend at right angles to the spindle axle and drive each of the spindle and the nut via a separate worm gear.
The constructional expenditure thus is relatively high and a clean compact construction of the device cannot be attained.
In this patent the use of this driving arrangement in air-craft is proposed and the fact that even when one of the two motors fails the driving arrangement still remains operable is emphasized as a special advantage. Of course this applies to any of these linear driving arrangements when they are operated with two motors.
US Patent 2,481,477 (Peery) discloses a two-motor linear driying arrangement, in which one motor drives the spindle directly. The motor driving the nut lies next to the spindle and drives the spindle via a toothed-wheel gearing.
The present invention provides a linear driving arrangement w~th two motors which has a mechanically clear and simple construction and thus is inexpensive to produce.
According to the present invention there is pro-vided a linear driving arrangement having two motors, one motordriying a nut and the other motor driying a screw spindle, the motors being attached to the outer end of two tubular casing members which are telescopically slidable into one another and are secured against rotation about their axis, the nut and the screw spindle being disposed on the inside of said casing mem-bers.
Thus in the present invention the motors are attached to the outer end of two tubular casing members which are telescopically slidable with respect to each other and are secured against rotation about their axis and the nut and the screw spindle are disposed on the inside of these casing members.
The present invention will be further illustrated by way of the accompanying drawings, in which:-Figure 1 is a longitudinal section through a lineardriving arrangement according to one embodiment of the present invention;
Figure 2 is a lateral view of the rotary ball nut with a portion of a spindle according to Figure l;
Figure 3 is a section along the line III-III in Figure l;
Figure ~ is a section through the casing members which are telescopically slidable with respect to each other and are secured with nut and spring against rotation;
Figures 5 and 6 are variants of Figure ~; and FIgure 7 is a diagrammatic section through a lineax driving arrangement for extremely slow feed or extremely small feed steps according to anoth.er embodiment of the present invention.
A slugyish, very slow feed can be attained when the ~wo motors have the same sense of rotation but are run with a small difference in speed. A fast feed can be attained when only one motor is operated and the other motor is at a standstill. Finally a very fast feed can be attained when the motors are oppositely run.
US Patent 2,630,022 discloses a linear driving arrangement with two motors in an open-type construction. The motor axles extend at right angles to the spindle axle and drive each of the spindle and the nut via a separate worm gear.
The constructional expenditure thus is relatively high and a clean compact construction of the device cannot be attained.
In this patent the use of this driving arrangement in air-craft is proposed and the fact that even when one of the two motors fails the driving arrangement still remains operable is emphasized as a special advantage. Of course this applies to any of these linear driving arrangements when they are operated with two motors.
US Patent 2,481,477 (Peery) discloses a two-motor linear driying arrangement, in which one motor drives the spindle directly. The motor driving the nut lies next to the spindle and drives the spindle via a toothed-wheel gearing.
The present invention provides a linear driving arrangement w~th two motors which has a mechanically clear and simple construction and thus is inexpensive to produce.
According to the present invention there is pro-vided a linear driving arrangement having two motors, one motordriying a nut and the other motor driying a screw spindle, the motors being attached to the outer end of two tubular casing members which are telescopically slidable into one another and are secured against rotation about their axis, the nut and the screw spindle being disposed on the inside of said casing mem-bers.
Thus in the present invention the motors are attached to the outer end of two tubular casing members which are telescopically slidable with respect to each other and are secured against rotation about their axis and the nut and the screw spindle are disposed on the inside of these casing members.
The present invention will be further illustrated by way of the accompanying drawings, in which:-Figure 1 is a longitudinal section through a lineardriving arrangement according to one embodiment of the present invention;
Figure 2 is a lateral view of the rotary ball nut with a portion of a spindle according to Figure l;
Figure 3 is a section along the line III-III in Figure l;
Figure ~ is a section through the casing members which are telescopically slidable with respect to each other and are secured with nut and spring against rotation;
Figures 5 and 6 are variants of Figure ~; and FIgure 7 is a diagrammatic section through a lineax driving arrangement for extremely slow feed or extremely small feed steps according to anoth.er embodiment of the present invention.
2 -Refer~ing to the accompanying drawings, the linear drlving axrangement c~prises two tubular casing members 1 and 2 whXch are telescopi~cally slidable with respect to each other the outer ends being reinforced at 11 and at 21. ~ motor Ml and a motor M2 are fastened to said ends. A journal ~ox 22 on the inner casing member 2 and a journal box 12 installed in the outer casing member 1 prov~de precise guldance of the members.
Pegs 13, 23 by means of which the driving arrangement can be connected to the-members to be actuated are installed on the reinforced ends 11, 21.
It is evident from Figure 3 that the reinforced end 21 is provided with recesses 24 for receiving screws with hexagonal recessed holes 25 with which the motor M2 is fastened to the tubular casing member end. The motor is fastened to the reinforced end 11 by means of screws on the inside of the tubular casiny member 1. (The screws are not shown for the sake of clarity.) The motor flanges of the two motors M1 and M2 have a tie 16 and 26, respectively, by means of which they are exactly centered in the reinforced casing ends 11 and 21 respectively.
The casing members 1 and 2 must be additionally secured against rotation. For this purpose as shown in Figure ~, two longitudinal grooves are provided in the outer member 1 and two slide wedges 200 are provided in the inner member 2. Figures 5 and 6 show other structures for such purpose. ~n thR stxucture according to Figure 5~paths in which balls 201 run are provi.ded in the outer member 1' and in the member 2' extending parallelly to the member axis.
This kind o~ ~u~dance is precise and nevertheless of easy motion.
5e~
In ~i~ure 6 the outer casin~ ~e~ber 1" is pr~vided with a plurality of longitudinal graoves which form a type of internal gear~ng 2Q2 and the inner member 2ll is provided with. a corresponding external gearing 203, This type of guidance can absorb la~ge forces.
Instead of using tubular casing members which are telescopically slidable with respect to each other the casing members 1 and 2 can also have a polygonal cross section, for example, a tetragonal or a hexagonal cross section. Special means of securing against rotation can thus be dispensed with.
The motor Ml drives a rotary ball nut 31 by means of a hollow coupling element 3. One end 32 of the coupling element 3 is connected to the shaft of the motor M
and the other end is widened in a bell-shaped manner so that the rotary ball nut 31 can be received therein~ It is pressed into this end, secured against rotation by a wedge 34 and additionally secured against slidiny by a retaining ring 35. In the tubular member 36 between the two ends the end of the screw spindle is slidably and rotatably supported.
The mo-tor M2 drives the screw spindle 4. For this purpose the shaft of the motor M2 is connected to one end of the spindle by means of a muff coupling 41. The screw spindle 4 h.as a thread corresponding to the balls of the rotary ball nut 31 as is evident from Figure 2. The free end of the screw spindle is provided with a journal box 42 which is rotatab~e on the spindle end and is held axially by a retaining ring 43~ The external diameter of the journal box .is so dimensioned that it is slidingly displaceable in the tubular member 36 of the coupling elements. This addit.ional support at the free end o~ the screw spindle is very important since it prevents the screw spindle f~om oscillating at high numbers of rotation.
The driving arrangement can be operated with one or two motors ~1 and M2. Correspondingly a sluggish, an averaye or a very fast feed can be attained. By feed is meant both an increase of the distance X and a reduction of the distance x.For example, it is possible to carry out the feed in a direction of increase of the distance X sluggishly (by operating the two motors but with a smaller difference in the number of revolutions) or the feed can be carried out very rapidly in the opposite direction (by operating the two motors with opposite directions of rotation). This has already been mentioned.
The guide journal boxes 12, 22 of the casing members 1 and 2, the length of the spindle and the axial length of the nut limit the maximal feed length, i.e., the stroke to the extent H (Figure 1).
When using a rotary ball nut with corresponding screw spindle high-precision linear feed devices which operate withou-t play can be produced. Of course, the motor shafts must be supported so as to be free from play axially as well as radially. In cases in which precision is not so important and more attention is paid to the price a simple bronze nut can be used.
Instead of using radial pegs 13, 23 as surface for transmission of power many other structures are possible.
For example, the outer beariny pla-tes of the motors Ml, M2 can be provided with eyelets for the transmission of force.
~ ith this linear driving arranyement a slow feed motion can be achieved in a simple and inexpensi~e manner in that the two motors are operated at a slight difference in speed. However, when precisel~ measured Eeed steps of 1OO mm or less are requixed, then stepping motors must he used ~ small constant ;Eeed steps are to ~e attained with the linear dri~ving axrangement according to Figure 1, a SteppIng ~otor, for example, motor Ml and a motor M2 braked to a standstill can be used. IE, for example, the stepping motor M1 indicates 1000 steps per rotation and only this motor is started so that it makes one step, then at a spindle pitch of 2 mm Eeed steps of 1OOO x 2 = O.002 mm can be attained.
If extremely small feed steps are to be attained with the linear driving arrangement according to Figure 1, it is advantageous to use two di~ferent stepping motors, for example, a motor M1 which makes 1000 steps per rotation and a motor M2 making 999 steps per rotation. If the two motors are so started that they make one step in the same direction of rotation and if the thread pitch of the spindle is two millimetres, then a feed step of 1 1 x 2 = 2 x 10 mm can be attained.
These stepping motors with 1000 steps or with 999 steps are very costly.
The modification o~ a linear driving arrangement represented diagrammatically in Figure 7 provides a struc-ture with which extremely small feed steps can be realized, using relatively inexpensive stepping motors.
When the two motors Ml and M2 make a full rotation in the same direction, a ~eed of approximately l/lOOQ mm results, as will be described hereaEter.
In Ftguxe 7 similar parts have the same reEerence numbers as in ~igure 1. In the two casin~ memhers 1, 2, which are telescopically slidable with xespect to one another, there are disposed a hollow coupling element 3 and a screw 5~
spindle 4, In the portion 33 which is widened in a bell-shaped ~anner there is disposed a high-precision rotary ball nut interacting with the screw spindle 4, which operates precisel~ and ~ree ~ro~ play.
The di~fe~ence between the linear driving arrangement shown in E'igure 7 and that according to Figure 1 lies in that ~oth the coupling element 3 and the screw spindle 4 are not longer connected directly to the motor shafts but they are separately so supported at 50 and 51 respectively in the casing members Gl,G2 that they are axially and radially free from play.
Toothed-belt transmission gearings 500,501,502 and 600,601,602 are disposed in t~e casing members Gl and G2.
Each of said belt-transmission gearings comprises a toothed-belt wheel 500 and 600, respectively, a toothed belt pinion 502 and 602, respectively, and a toothed-belt 501 and 502 respectively. The pinions 502 and 602 are driven by the motors Ml and M2 respectively. The motors are laterally flanged to the casing members Gl and G2. The gear ratios of the two toothed-belt gearings differ slightly from each other.
For the example shown it holds true that wheel 600 has 44 teeth and pinion 602 has 15 teeth. This results in a year ratio U = 145 - 0.340909 and wheel 500 has 41 teeth and pinion 502 has 14 teeth. This results in a gear ratio U = 144 = 0.3414634 ~hen the two motors Ml,M2 make a rotation in the same direction, the nut makes Q.340909 rotation and the spindle ~.3414634 Xotation. Since the direction of rotation is the same, th~s corresponds to a 0.34]4634 - 0.34n9Q9 = 0.0006524 5~
rotation ~f the spindle relati~e to the nut. At a ptich o~
the spindle thread o~ 2 mm this corresponds to a ~eed of O.OQ13048 ~. When the two motor~ make a complete rotation through 3~Q the ~eed thus is slightly more than l~lOQO
millimetre.
When using stepping motors they can be so con-trolled that the linear driving arrangement, for example, upon pressing a button, moves one machine member at a time, ` for example, a cross-table Tl,T2 by 1/1000 millimetre.
With such small Eeed steps it is of course important that all the members operate so that they are free from play. This can be attained by using slightly prestressed antifriction bearings, by a rotary ball nut operating free from play and having a ground spindle and by toothed-belts operating free from play. When using the linear driving arrangement Eor adjusting a cross-table having the members Tl,T2, which, as mentioned hereinbefore, permits a feed with extremely small steps, the possibility of rapid adjustment is maintained nevertheless. When only one motor is driven while the other motor is at a standstill this results in a fast feed. When the second motor is run in the opposite direction the rate of feed even doubles. The gear ratio of the intermediate gearings - which only is approximately 1 to
Pegs 13, 23 by means of which the driving arrangement can be connected to the-members to be actuated are installed on the reinforced ends 11, 21.
It is evident from Figure 3 that the reinforced end 21 is provided with recesses 24 for receiving screws with hexagonal recessed holes 25 with which the motor M2 is fastened to the tubular casing member end. The motor is fastened to the reinforced end 11 by means of screws on the inside of the tubular casiny member 1. (The screws are not shown for the sake of clarity.) The motor flanges of the two motors M1 and M2 have a tie 16 and 26, respectively, by means of which they are exactly centered in the reinforced casing ends 11 and 21 respectively.
The casing members 1 and 2 must be additionally secured against rotation. For this purpose as shown in Figure ~, two longitudinal grooves are provided in the outer member 1 and two slide wedges 200 are provided in the inner member 2. Figures 5 and 6 show other structures for such purpose. ~n thR stxucture according to Figure 5~paths in which balls 201 run are provi.ded in the outer member 1' and in the member 2' extending parallelly to the member axis.
This kind o~ ~u~dance is precise and nevertheless of easy motion.
5e~
In ~i~ure 6 the outer casin~ ~e~ber 1" is pr~vided with a plurality of longitudinal graoves which form a type of internal gear~ng 2Q2 and the inner member 2ll is provided with. a corresponding external gearing 203, This type of guidance can absorb la~ge forces.
Instead of using tubular casing members which are telescopically slidable with respect to each other the casing members 1 and 2 can also have a polygonal cross section, for example, a tetragonal or a hexagonal cross section. Special means of securing against rotation can thus be dispensed with.
The motor Ml drives a rotary ball nut 31 by means of a hollow coupling element 3. One end 32 of the coupling element 3 is connected to the shaft of the motor M
and the other end is widened in a bell-shaped manner so that the rotary ball nut 31 can be received therein~ It is pressed into this end, secured against rotation by a wedge 34 and additionally secured against slidiny by a retaining ring 35. In the tubular member 36 between the two ends the end of the screw spindle is slidably and rotatably supported.
The mo-tor M2 drives the screw spindle 4. For this purpose the shaft of the motor M2 is connected to one end of the spindle by means of a muff coupling 41. The screw spindle 4 h.as a thread corresponding to the balls of the rotary ball nut 31 as is evident from Figure 2. The free end of the screw spindle is provided with a journal box 42 which is rotatab~e on the spindle end and is held axially by a retaining ring 43~ The external diameter of the journal box .is so dimensioned that it is slidingly displaceable in the tubular member 36 of the coupling elements. This addit.ional support at the free end o~ the screw spindle is very important since it prevents the screw spindle f~om oscillating at high numbers of rotation.
The driving arrangement can be operated with one or two motors ~1 and M2. Correspondingly a sluggish, an averaye or a very fast feed can be attained. By feed is meant both an increase of the distance X and a reduction of the distance x.For example, it is possible to carry out the feed in a direction of increase of the distance X sluggishly (by operating the two motors but with a smaller difference in the number of revolutions) or the feed can be carried out very rapidly in the opposite direction (by operating the two motors with opposite directions of rotation). This has already been mentioned.
The guide journal boxes 12, 22 of the casing members 1 and 2, the length of the spindle and the axial length of the nut limit the maximal feed length, i.e., the stroke to the extent H (Figure 1).
When using a rotary ball nut with corresponding screw spindle high-precision linear feed devices which operate withou-t play can be produced. Of course, the motor shafts must be supported so as to be free from play axially as well as radially. In cases in which precision is not so important and more attention is paid to the price a simple bronze nut can be used.
Instead of using radial pegs 13, 23 as surface for transmission of power many other structures are possible.
For example, the outer beariny pla-tes of the motors Ml, M2 can be provided with eyelets for the transmission of force.
~ ith this linear driving arranyement a slow feed motion can be achieved in a simple and inexpensi~e manner in that the two motors are operated at a slight difference in speed. However, when precisel~ measured Eeed steps of 1OO mm or less are requixed, then stepping motors must he used ~ small constant ;Eeed steps are to ~e attained with the linear dri~ving axrangement according to Figure 1, a SteppIng ~otor, for example, motor Ml and a motor M2 braked to a standstill can be used. IE, for example, the stepping motor M1 indicates 1000 steps per rotation and only this motor is started so that it makes one step, then at a spindle pitch of 2 mm Eeed steps of 1OOO x 2 = O.002 mm can be attained.
If extremely small feed steps are to be attained with the linear driving arrangement according to Figure 1, it is advantageous to use two di~ferent stepping motors, for example, a motor M1 which makes 1000 steps per rotation and a motor M2 making 999 steps per rotation. If the two motors are so started that they make one step in the same direction of rotation and if the thread pitch of the spindle is two millimetres, then a feed step of 1 1 x 2 = 2 x 10 mm can be attained.
These stepping motors with 1000 steps or with 999 steps are very costly.
The modification o~ a linear driving arrangement represented diagrammatically in Figure 7 provides a struc-ture with which extremely small feed steps can be realized, using relatively inexpensive stepping motors.
When the two motors Ml and M2 make a full rotation in the same direction, a ~eed of approximately l/lOOQ mm results, as will be described hereaEter.
In Ftguxe 7 similar parts have the same reEerence numbers as in ~igure 1. In the two casin~ memhers 1, 2, which are telescopically slidable with xespect to one another, there are disposed a hollow coupling element 3 and a screw 5~
spindle 4, In the portion 33 which is widened in a bell-shaped ~anner there is disposed a high-precision rotary ball nut interacting with the screw spindle 4, which operates precisel~ and ~ree ~ro~ play.
The di~fe~ence between the linear driving arrangement shown in E'igure 7 and that according to Figure 1 lies in that ~oth the coupling element 3 and the screw spindle 4 are not longer connected directly to the motor shafts but they are separately so supported at 50 and 51 respectively in the casing members Gl,G2 that they are axially and radially free from play.
Toothed-belt transmission gearings 500,501,502 and 600,601,602 are disposed in t~e casing members Gl and G2.
Each of said belt-transmission gearings comprises a toothed-belt wheel 500 and 600, respectively, a toothed belt pinion 502 and 602, respectively, and a toothed-belt 501 and 502 respectively. The pinions 502 and 602 are driven by the motors Ml and M2 respectively. The motors are laterally flanged to the casing members Gl and G2. The gear ratios of the two toothed-belt gearings differ slightly from each other.
For the example shown it holds true that wheel 600 has 44 teeth and pinion 602 has 15 teeth. This results in a year ratio U = 145 - 0.340909 and wheel 500 has 41 teeth and pinion 502 has 14 teeth. This results in a gear ratio U = 144 = 0.3414634 ~hen the two motors Ml,M2 make a rotation in the same direction, the nut makes Q.340909 rotation and the spindle ~.3414634 Xotation. Since the direction of rotation is the same, th~s corresponds to a 0.34]4634 - 0.34n9Q9 = 0.0006524 5~
rotation ~f the spindle relati~e to the nut. At a ptich o~
the spindle thread o~ 2 mm this corresponds to a ~eed of O.OQ13048 ~. When the two motor~ make a complete rotation through 3~Q the ~eed thus is slightly more than l~lOQO
millimetre.
When using stepping motors they can be so con-trolled that the linear driving arrangement, for example, upon pressing a button, moves one machine member at a time, ` for example, a cross-table Tl,T2 by 1/1000 millimetre.
With such small Eeed steps it is of course important that all the members operate so that they are free from play. This can be attained by using slightly prestressed antifriction bearings, by a rotary ball nut operating free from play and having a ground spindle and by toothed-belts operating free from play. When using the linear driving arrangement Eor adjusting a cross-table having the members Tl,T2, which, as mentioned hereinbefore, permits a feed with extremely small steps, the possibility of rapid adjustment is maintained nevertheless. When only one motor is driven while the other motor is at a standstill this results in a fast feed. When the second motor is run in the opposite direction the rate of feed even doubles. The gear ratio of the intermediate gearings - which only is approximately 1 to
3 - is not very important in the present case.
In addition to the descrihed use of the linear driving arrangement for the gradual drive of a cross-table involving feed and standstill the linear driving arrangement can be used for a continuous, extremel~ slow feed. This kind of use i5 suitable, for example, for solar energy plants in which mirrors must be readjusted corresponding to the position of the sun.
In addition to the descrihed use of the linear driving arrangement for the gradual drive of a cross-table involving feed and standstill the linear driving arrangement can be used for a continuous, extremel~ slow feed. This kind of use i5 suitable, for example, for solar energy plants in which mirrors must be readjusted corresponding to the position of the sun.
Claims (18)
1. A linear driving arrangement having two motors, one motor driving a nut and the other motor driving a screw spindle, the motors being attached to the outer end of two tubular casing members which are telescopically slidable into one another and are secured against rotation about their axis, the nut and the screw spindle being dis-posed on the inside of said casing members.
2. A linear driving arrangement according to claim 1, in which the shaft of the motor driving the nut is connected to a hollow coupling element in which the end of the screw spindle is supported so as to be rotationally slidable.
3. A linear driving arrangement according to claim 1, in which the two motors are disposed on the casing members in axial alignment to the axis of the screw spindle and are connected directly to the screw spindle and to the hollow coupling element.
4. A linear driving arrangement according to claim 1, in which both the screw spindle and the coupling element are individually supported in the casing members so as to be axially and radially free from play, that each of them is driven by an intermediate gearing of the motors and said intermediate gearings are disposed on the outer ends of the casing members.
5. A linear driving arrangement according to claim 4, in which the intermediate gearings have a very small but precisely defined difference of their gear ratio.
6. A linear driving arrangement according to claim 1, in which the motors are stepping motors.
7. A linear arrangement according to claim 4, in which the intermediate tearings are toothed-belt gearings which are free from play.
8. A linear driving arrangement according to claim 4, in which the intermediate gearings are toothed-wheel gearings.
9. A linear driving arrangement according to claim 2, in which the hollow coupling element is widened in a bell-shaped manner on its end facing away from the motor and a rotary ball nut is disposed in said end.
10. A linear driving arrangement according to claim 1, in which the two casing members which are telescopi-cally slidable into one another are secured against rotation by at least one longitudinal groove disposed on the inside of the outer tubular casing member and by at least one spring disposed externally on the inner tubular casing member.
11. A linear driving arrangement according to claim 1, in which the two casing members which are telescopi-cally slidable into one another are secured against rotation by a plurality of longitudinal grooves installed externally on the inner tubular casing member and by a corresponding number of longitudinal grooves disposed on the inside of the outer tubular casing member.
12. A linear driving arrangement according to claim 1, in which the two casing members which are telescopi-cally slidable into one another are provided with longitudi-nal grooves forming paths which are disposed on the inside of the outer tubular casing member and on the outside of the inner tubular casing member and balls securing the tubular casing members against rotation are disposed in said longitudinal grooves.
13. A linear driving arrangement according to claim 1, in which the two casing members which are telescopi-cally slidable into one another have a polygonal cross section.
14. A linear driving arrangement according to claim 1, in which the free ends of the external casing member is secured against the inner tubular casing member by a slidable annular sealing element.
15. A linear driving arrangement according to claim 1,driving a device in constant small feed steps, at least one stepping motor being present.
16. An arrangement according to claim 15, in which two stepping motors having the same number of steps per rotation are present.
17. An arrangement according to claim 15, in which two stepping motors having different numbers of steps per rotation are present.
18. An arrangement according to claim 15, in which a stepping motor and a motor braked at a standstill are present.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CHCH-5025/82-5 | 1982-08-24 | ||
| CH5025/82A CH647306A5 (en) | 1982-08-24 | 1982-08-24 | Linear drive device with two motors |
| CHCH-2303/82-0 | 1983-04-29 | ||
| CH230382 | 1983-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1214050A true CA1214050A (en) | 1986-11-18 |
Family
ID=25690066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000435180A Expired CA1214050A (en) | 1982-08-24 | 1983-08-23 | Linear driving arrangement with two motors |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1214050A (en) |
-
1983
- 1983-08-23 CA CA000435180A patent/CA1214050A/en not_active Expired
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Legal Events
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| MKEX | Expiry |