DE1904664A1 - Drive device for the coordinate axes on coordinate taps on drawings and the like. - Google Patents

Description

Patent attorney * * i- _n iqrq

-h ^ - "'' Tl Vessel Munich, the * ^LJ *" * ^{l! l} '

S My reference: FK-2384

Hohenstaufenstrasse 2, Tel. 35 8111

Ford-Werke Aktiengesellschaft

Cologne-Deutz
Ottoplatz 2

"Drive device for the coordinates - axes on coordinate taps on drawings and the like "

For this registration, the priority of registration Se.No. 717 850 dated April 1, 1968 in the United States by North America claimed.

Brief description

The invention relates to a controller for a two-dimensional Probe head on a coordinate measuring device. It will contain a closed electrical circuit a rotating field torsion force transmitter and a rotating field torsion force receiver used to move the sensing device along the one Drive coordinate axis. Another closed electrical circuit is provided which has a control transmitter as well includes a control transmitter to the probe device to drive in the direction of a second coordinate axis. The frictional forces for adjustment in the direction of the second axis are higher than the corresponding forces for adjustment in the direction of the first axis.

909846 / 048A

H a u ρ t b e s c h r e 1 b ü η g

The invention relates to a controller for a two-dimensional Device for taking measurements. The device contains measuring devices for taking down the coordinates of certain Points of an arbitrary two-dimensional outline. It is a device for reading the coordinate values of each point

provided when a search button is above any specific point to be located on the outline.

In the case of the improved training, a facility is provided in order to spread a two-dimensional drawing on a horizontal surface, a carriage is arranged above the drawing, the rotates in the direction of a first coordinate axis. The car carries a button in the shape of a television camera, polygamy scans the outline as the carriage moves over the drawing. This car has a main axis, the one corresponds to the second coordinate axis and the television camera is movable on the carriage and can move in the direction of the second coordinate axis be moved.

An electrical pulse generator that is mounted on the camera by the The device is set up so that it gives an electrical impulse for every jump in movement of the camera supporting device with respect to the carriage in the direction of the second coordinate axis generated. A second electrical pulse generator carried by the viagen on one edge of the drawing

909846/0 48A

is, lies over a fixed part of the device when it generates an electrical impulse every time the carriage moves in the direction of the first coordinate axis.

The electrical impulses are sent to one via electrical lines Electronic counter, which adds or subtracts the pulses for each coordinate value, depending on the direction of movement the camera and the direction of movement of the car. There will therefore be a resulting coordinate value for each point supplied the control system of a conventional card punching device. The measured value that is recorded on punch cards is a record the message signal from the two-dimensional drawing, which is transmitted to a preprogrammed computer which is used to manufacture a control band of a machine tool controlled by numerical values. That Procedure for using the measured values from the coordinate pick-up is described in the application P 16 27 075.0, to which reference is also made.

The outline measurement system of the invention is semi-automatic Oversize reading device in which a probe in the form of a TV camera button with the help of a television control instrument can be moved to a reference point to which the coordinate values of each outline point relate. A hand-controlled, semi-automatic drive for the car enables the operator to control the position from the control point of the television monitor Control the television camera push button when setting up

909846/0484

for recording and registering the coordinate values of a specific, th point on the outline.

If the car is moved by the worker in this way with reference to the previously established zero or reference point, then generate The magnetic scanning heads emit an electrical pulse for every 0.025 mm of movement in the direction of the first and in the direction the second coordinate axis. The coordinate axes are referred to as the X-axis and Y-axis. The pulses thus generated are added or subtracted by an electronic counter when the worker locates the tactile target on the television monitor.

When the desired point on the curve has been reached, the worker can press a switch on the monitor, which the Control for a punched card device operated so that the latter receives the output data of the electronic counter. Successive points in the outline are defined in this way by the reference coordinates.

Relatively large distances can be permitted if the outline is relatively flat. Closer distances between the measuring points are required when the radius of the curvature of the outline decreases. Once the coordinate points have been recorded, the coordinate points for points between the measured points can be determined by interpolation _{3 in} that a curve is determined according to a method which in the aforementioned earlier approach. message is described. It is briefly described here for reference.

909846/0484

In the case of known coordinate pickups, a device is in place to drive the trolley by a servomotor or a hand spindle or by other manually operated drive devices. The driving force acts on one end of the carriage, namely next to an end support of the carriage. The two end supports for the carriage must allow a displacement movement of the carriage in the direction of the X-axis when the probe head is with the Outline lines on the drawing board covers. This creates a frictional force at each end support that is generated by the drive motor or the hand drive device for the cart must be overcome. When the drive mechanism is actuated, the friction tends to occur at the other end of the carriage to move it or it gets an inclined position with respect to the Y-axis direction.

In the case of motor vehicle bodywork processing, the transverse dimension of the drawing board is relatively large and therefore also the Inclination or adjustment of the carriage from the parallel position ( to the Y-axis. This is of great importance. This creates an error in the readings. Object of the present invention It is therefore to create a coordinate pick-up that has a carriage facility in which precautions are taken to avoid it an undesired adjustment from the proper working position are taken out with respect to the Y-axis when the carriage is moved in the direction of the X-axis.

According to one feature of the invention a device is in the form

909846/0484

a remote-controlled motor circuit for setting the carriage both in the X-axis direction and in the Y-axis direction provided semi-automatically. This facility includes a electrical pulse generator controlled by the worker, which is arranged next to a television monitor, which a tactile signal from the television camera button. The X and Y axis position controls can be operated in this way, when the worker on the monitor over the movement path of the probe head the drawing board follows without the worker having to interrupt the observation of the monitor screen. These consists of a Y-axis carriage drive and an X-axis carriage drive, which, independently of the control table operated by the worker, receive the signals generated by the pulse generators of the X-axis and the Y-axis are generated.

Another feature of the invention is to provide a drive remote control of the type described above, including a first input part for the movement to produce a coarse adjustment of the carriage, sorie a second input part for the Movement to fine tune. This will reduce the time it takes to put the probe over the Adjusting the target area is considerably reduced without sacrificing accuracy.

Another feature of the invention is an improved To create a drive for setting the probe head in the main axes, in which the worker either actuates the coarse drive

909846/0484

tigt, or fine-tuning while aiming the probe at the measuring point.

The main part of the description coincides with the application P 16 38 029.3. An exemplary embodiment is illustrated below with reference to the drawings explained in more detail, on which show:

Fig. 1 is a plan view of a coordinate gripper with a. clamped drawing board, with the probe head camera shifted to the left.

FIG. 2A is an enlarged top plan view of the left side of FIG Fig. 1.

FIG. 2B is an enlarged top plan view of the right side of FIG. 1.

3A shows a side view from the left end of the coordinate gripper.

3B is a side view from the right side of the coordinate gripper.

Figure ¹ JA is an end view of the embodiment of Figures 1, 2A, 2B, 3A and 3B.

FIG. ¹ IB shows a cross section along the section line 4E- ¹ JB of FIG. 3A.

909846/0484

- 8 pig. 5 a section along line 5-5 of the Pig. 3A.

"Fig. 6 is a section along line 6-6 of Fig. 3B and the line 6-6 of Fig. 11.

7 shows a section along line 7-7 in FIGS. 3B and 6.

Fig. 8 is a section along line 8-8 of Fig. 7. ·

FIG. 9 is a section along line 9-9 in FIG. 7.

FIG. 10 shows a section along line 10-10 in FIG. 9.

11 is a section along line 11-11 in FIGS. 1, 2B and 12 is a section along line 12-12 of FIGS. 2B and 3B.

13 is a section along line 13-13 in FIGS. 2B and 14.

13A shows a section along line 13A-13A of FIG. 13.

Fig. Ik is a section along the line l ^ -ΐΊ of FIGS. 12 and 3B.

15 is a plan view of part of the vehicle for the probe head camera.

FIG. 16 shows a section through the axis along the line l6-l6 in FIG. 2B

909846/0484

- 9 -
and 15.

Pig. 17 a section through the carriage along line 17-17 of Fig. 2B and 15.

Fig. 18 is a section through the carriage along line 18-18 of Fig. 15 and 19.

19 shows a section through the VJagen along line 19-19 in FIGS. 18, 20 and 21.

20 shows a section along line 20-20 in FIGS. 15 and 19.

FIG. 21 shows a section along line 21-21 of FIG is also shown in FIG.

FIG. 22 is a partial plan view along the line 22-22 of FIG. 23;

23 shows a section along line 23-23 in FIGS. 2B, 22 and 24.

24 shows a section along line 24-24 of FIGS. 2B- and 23. FIG. 25 shows a section along line 25-25 of FIG. 6.

FIG. 26 is a view of the electrical feed line for the carriage seen from the plane of section line 26-26 of FIG. 2A

909846/0484

- ίο -

2B and 1..

Pig. 27 shows a section along line 27-27 in FIG.

28 shows a section along line 28-28 in FIGS. 26 and 29.

FIG. 29 is a section seen from the plane of section line 29-29 in FIG. 28.

FIG. 30 is a partially broken away plan view seen from FIG Plane of section line 30-30 of FIG. 31.

FIG. 31 shows a section along line 31-31 in FIG. 30.

FIG. 32 shows a section and a partial top view along section line 32-32 in FIG. 33.

FIG. 33 shows a section and a partial view along the section line 33-33 in FIG. 32.

Fig. 3 ^ A is a section through the lifting device for the drawing plate seen from the plane of the section line 3 ^ -3 ^ of FIG. 2A and the section line 34A-3 ² * A of FIGS. 36 and 35B.

Fig. 34b is a section as a continuation of Fig. 3 ^ A after Section line 34B-34B of Figure 2A.

909846 / CU8

Pig. 35A is a section through the drawing table seen from the plane of section line 35-35 of FIGS. 2A and 3 ¹ JA.

Pig. 35B is a continuation of the section of FIG. 35A.

36 shows a section along line 36-36 in FIGS. 2B and

37 shows a section along line 37-37 in FIG. 2A.

38 shows a longitudinal section along line 38-38 in FIGS. 2A and 2B. *

39 shows a section along line 39-39 in FIG. 38..

FIG. 40A shows a longitudinal section along line 40-40 of FIG. 2B.

40B is a continuation of the illustration according to FIG. 40A.

4l shows a section through the support support along line 4l-4l

of Fig. 3A. . Ä

Figure 42 is a partially sectioned view taken along line 42-42 of Fig. 43.

43 shows a section along line 43-43 in FIGS. 1, 3A and 42.

FIG. 44 shows a section through the adjusting device for the carriage seen from the plane of section line 44-44 in FIG. 42.

909846/0484

Pig. 45 is a partial plan view of the device near ⁷ Fig. "44, seen from the plane of section 45-45 of FIG. 42.

46 shows a cross section of a first embodiment of the carriage, Support as seen from the sectional plane of the line 46-46 in FIG. 47.

47 is a longitudinal section of a modified embodiment of the cantilevered end of the carriage beam after line 47-47 of the> 46.

48 shows a section along line 48-48 in FIG. 47.

Fig. 49 is a section along line 49-49 in Fig. 47. ·

FIG. 50 shows an illustration of the components in support of FIG. 47 seen from the plane of section line 50-50 in FIG. 47.

51 is a schematic representation of the electric carriage adjusting device for the X axis.

52 and 53 are schematic representations of the circuit for the torque transmitter and the control transformer for the Circuit according to Fig. 51.

54 shows a representation of the transmission for the arrangement according to FIG. 51 for the Y-axis setting.

As shown in Fig. 1, the coordinate pickup has a

909846 / CU84

the _} drawing plate carrying table 10 on which a drawing plate 12 made of sheet aluminum is arranged. The surface; The drawing plate shown in FIGS. 2A and 2B is provided with reference lines 12. The outline of an object on the tapping plate is denoted by 14. The line is provided with points in the manner already described by using measured value points which result from characteristic lines of a three-dimensional clay model. A zero point is defined on the drawing plate and all points on the outline 14 are defined with reference to the zero point and the X and Y axes.

The points measured on the outline 14, which are scanned by the coordinate pick-up, are denoted by ΐβ. At the points of small radius of curvature of the contour line 14, the points 16 are relatively close to one another. Another Distance is possible at points on the outline where it is relatively flat.

The table 10 of the coordinate pick-up has a smooth surface and a bed that rests on firm ground. There are bearing balls 18 and 18 'for supporting the drawing plate used in distributed openings 20 and 20 · in the Table 10 sit for the purpose of sliding the drawing board on the table 10 when it is assembled. The balls can go through a suitable cam device is raised and lowered, so that they reach above the upper surface of the table 10 and engage the lower surface of the drawing board 12. the

909846/0484

■ - in -.

Balls rotate, when the plate 12 on the. Table IQ in. ^ Tel, - ,. ment is brought. If the plate is properly adjusted, sq;. ", ... the balls 1θ and l8 ^f can be inserted into the openings 20 and. 20 *. a-. ,! sucked by the lever device for actuation ".. is pulled back". ■ =. _; . · .- ..-_, _: .

The table 10 can also be provided with air nozzles, a number of which can be seen at 22. It can of compressed air to a distribution _s. system are supplied, which with the nozzle openings 22 ". communicates. The drawing plate 12 can then be supported hydro-,.;, Statically, since the air film enables friction-free support. If the plate 12 is properly adjusted, the pressure supplied to the distribution line connected to the nozzles 22 can be reduced to a sub-atmospheric value. whereby a vacuum is created which seeks to hold the plate 12 firmly on the surface of the table 10. .

The nozzles 22 sit in a central part of the surface of the table 10. The central part is jnit 24 in the "Fig. 3A ^ draws and there are two adjoining end pieces measuring 26 and 28 in denotes Figs. JA and 3B. Each of the end portions 26 and 28 is provided with the openings 20 or 20 'in order to achieve a proper loading; to allow load of the pick-up plate 12 made of aluminum on the top 10 of the table. . · »,. ·

At the. one side of the bed is in the Fig 1 with 30 _loading>,.; -; ._ ■ the drawn L-shaped attachment screwed on, which runs along the horizon

909846/0484

taläctise runs. It has a horizontally pointing part 32 and a vertically waving portion 34 (Fig. 7). The latter part is screwed to the side wall 38 of the bed by screws 36 (Pig. 11). A bar 40 carrying a carriage is circular Cross-section is carried by pins 42, de in openings of the - Approach part 32 sit. One passing through the extension part 32 Clamping pin 45 is threadedly engaged with rod 40 and holds this firmly on the extension 30, the rod 40 being placed on the mounting pins 42. The same pins are on both Ends of the rod 40 are provided.

The transverse part 44 of the carriage, which consists of a solid support made of metal consists, the ends of which are provided with milled surfaces 46 and 48 (Figure 11), carries two stub shafts 50 and 52, the In openings fit in surfaces 46 and 48. The stub support wheels 54 and 56 at the outer ends by means of bearings. The wheels 54 and 56 sit on the cylindrical outer surface of the rod 40 on. A corresponding set of support wheels sits at the opposite end of the cross member 44, as shown at 58 (Fig. 12).

On top of the cross member 44 sits a Y-axis drive 60, which is shown below will be described in detail. The device 60 is carried on a base plate 62, which in turn is on top of the Cross member 44 is screwed on (Fig. 6 and 7). A pre-setting of the cross member 44 in the X direction can be done by the worker be effected when it detects a handle 66 (FIG. 2B). This is attached to the top of the part 44.

909846/0484

The support part 62 carries a pivot pin 68 (Fig. 6). This in turn carries a support part 70 which can be pivoted about the axis of the pivot pin 68. The support part 70 carries a,. ■ Mounting shaft 72 (Fig. 9). A pulse generator 74 is provided with a hollow shaft. 76. provided, which engages over the shaft 72 and here is held by grub screws 78.

The pulse generator is designed as an angular angle receiver the voltage from the voltage source in the form of a rotary encoder under operator control as described below. The receiver 74 includes an anchor with an armature shaft 80 (FIG. 9) which is coupled to a gear shaft 82 via a coupling 84. The gear shaft 82 is mounted in the support shaft 72 and provided with a drive pinion 86 at its lower end.

On the vertical part 34 of the L-shaped extension 30 sits a Rack 88, in which the pinion 86 engages, which of your cross member 44 is supported. The support bracket 70 can be pivoted about the axis of the pivot pin 68 to engage to enable the rack 88 or a solution from it for the pinion 86.

A cam device on the carriage controlled by the worker in addition to the support part 70 is used for this adjustment.

The carriage consists of a carrier 90 (Fig. 17, 18, 21, 24), the

9098 4 6/048 / ·

. extends in the direction of the Y-axis. One end of the beam is supported by the cross member 44. It consists of a component with a cross-carving depth as shown at 92. The open end of the * parts » 92 is attached to a base plate 94, which in turn is screwed to the cross member 44. A toothed rack 96 fastened on top of part 92 extends in the direction of the Y-axis. A steel belt 98 (FIG. 22) runs parallel to the rack 96 over the carrier 92. One end of the belt 98 runs over a drive pulley 100 which forms part of the Y-axis drive mechanism 60. Another pulley 102 (Fig. 24) is rotatably mounted at the other end of the support 90 and carries the belt 98. The belt 98 runs around both disks 100 and 102 and is driven through the part 92 to obtain a continuous belt drive. The tape is attached to a television camera probe support which consists of a yoke 106 which extends over the top of part 92. The yoke carries a cam device 108 controlled by the worker, by which the yoke 106 is clamped to the steel band at 96. If the belt 98 is driven by the drive pulley 100, the movement is transmitted to the yoke 106 in the direction of the Y-axis.

The carrier plate 94 is provided with a track 110 on the edge. The roller 112 carrying the yoke, which is mounted on the yoke at the bottom, runs on this track. The other edge of the beam has a trajectory 114 which is arranged at an angle with respect to the normal plane (Fig. 24). Against this lies a Roller 120 at the opposite end of the yoke 106. Against the

9Ö98A6 / Q484

right edge 118 of track 11 * 1 is a roll 1ί6, " which is pivoted and rotates around a vertical axis * turns. The rollers 112, 116 and 120 form a rolling support for the yoke and a transverse adjustment in the direction of the Y-axis with beaug on the carrier is prevented.

The side of the yoke 106 on the track 110 is provided with a platform 122 on which a counterweight 124 (Pig. 18) rests. The opposite end of the yoke 106 carries a support 126 W for a television probe assembly 128. The line of sight for the lens of camera 128 is perpendicular to the plane of the drawing board.

On top of the yoke 106 sits a pulse generator 130 (Pig. L6), the is the same as the pulse generator 74, as already described. It has a pinion shaft and a pinion 86 · which meshes with the rack 96. The parts of the pulse generator 130, which have a counterpart in the generator 74 have the same Reference numerals with an index, the pinion 86 · can move ^ are that it engages in the rack 96 or released from her as the worker adjusts the cam portion at 132. The pulse generators 130 and 74 can be made from known parts exist and they can be set to have a

Generate voltage pulse for every jump in movement. It is useful to generate a pulse for each step adjustment of 0.025 in the X-direction or the Y-direction, depending on the suitability.

The belt 133 runs in the direction of the X-axis and runs over disks 134 and 136 at the right end of the middle table support

909846/0484

sung 24..At the other end of the table support 24 sits another idling disk 138 over which the belt 133 (Pig. 3A) is guided Ift. The belt then runs over a traction sheave l40 (wing 5), which is mounted on the table support. The band 133 describes a complete cycle when "it" in the direction of the X-axis returns to idle roller 136. The crossbeam 44 is attached to the belt 133 by means of a fastening part 142 controlled by the worker and carried by the crossbeam 44 will. The drive part 42 has a cam actuating part 144 which can tighten and loosen the clamping parts of the part 142, whereby the carriage 44 can be jammed with the belt 133 as desired and released by him.

The Y-axis carriage drive consists of a housing with walls 146 and 148 (Fig. 6). These are attached to the plate 62 by screws 150. Between the walls 146 and 148 sit between walls 152, 15 ¹ ", 156 and 158. The pivot motor 184, a conventional AC motor is secured by screws to the wall I60 146th Its armature shaft 162 carries a pinion 164 which meshes with a gear 166. This sits on an intermediate shaft 168 which is mounted in bearing openings in the walls 146 and 154. The shaft 168 can be coupled to another intermediate shaft 170 by means of an electrical coupling 172. The latter consists of friction parts 174 and 176 which can be tightened as desired, of which the latter is connected to the shaft 170 and the former to the shaft 168. The shaft 170 carries a drive pinion 178 which engages with the output gear on the output shaft 182. The shaft 182 passes through and through a bearing opening in the viand 148

.90 9 846/0484

another bearing opening in the partition wall 152. The after outward going end of the shaft 182 carries the already described ' Friction disc 100,

If the clutch 172 is tightened, there is a torque path between the armature of the motor 184 and the drive pulley 100. This drive is used to quickly cross the « To reach the car via the drawing board. It is not used when the worker is scanning the drawing to determine the coordinates determine the nata of the selected points on the drawing.

A synchronous motor 186 is also supported on wall 146 by screws 188. Its armature shaft 188 carries a drive pinion 190, which in turn engages in an idle gear wheel 192. This gear in turn is seated on a shaft 194 which is mounted in bearing openings in the partition walls 158 and 154. The shaft 194 supports also a pinion 196, soaked to another idler gear 198 is engaged. This is in turn connected to an intermediate shaft 200 and stored in intermediate walls 154 and 156. An electrically operated shaft coupling 202 arbitrarily connects the shaft 200 with the output shaft 182, which, as already mentioned, is supported in bearing openings in the intermediate walls 152 and 148. The coupling 202 receives current and the coupling is made 172 de-energized, so may be a mechanical check

drove between motor 184 and output shaft 182 as well the traction sheave 100 can be produced when the worker operates an associated electrical unit at the control station,

909846/0484

19046 (54

as described below .. In this way, the vision camera may be issued to movement on the support for ^v the car: be · \ IENN Ct readings are taken, this movement can move the camera, so they that they top the Umrißllnie on the tap board scans and thereby causes the pulse generator 130 to generate usable signals for each jump in movement. The motor 186 can be connected to a special circuit and receive any power or be de-energized to permit rapid transverse movement of the television camera.

The X-axis Wageηantrieb is generally designed in the same way, like the drive of the carriage for the Y-axis. It has a housing 210 (FIG. 5), which is preferably located within the support part 28 is arranged for the table. The drive pulley l4o on the output shaft 212 sits outside of the table part 28.

An AC motor 214 is attached to the first by bolts 216 End wall 218 of housing 210 attached.

The shaft 212 is supported in bearing openings in the second end wall 220 and the intermediate wall 222 of the housing 210.

In addition to the partition 222, the housing 210 has two additional ones Partitions 224 and 226. These carry bearings for a shoulder 228 of the armature shaft, which is directly connected to the armature shaft 230 of the motor 214. The shaft 228 is with the Armature shaft 230 coupled by a coupling 232. "■

9098U / CH84

"CC" 4 ·

The shaft 228 carries a drive pinion 23 ^ " Es grein In a ^f τ m gear 236 on the intermediate parts 238. This shaft is rotatably supported in bearing openings in the walls 224 and 226 ''. -, iv

An arbitrarily attractable electrical coupling: 24o.zwischen nevertheless ■ partitions, .222 and 22 (5 *, a driving frictional connection between the shaft 238 and another intermediate shaft 242 ago ^{i -} provide '", which in bearing openings in the end wall 220 and the intermediate wall 222. This shaft 242 carries a drive pinion 244 which meshes with the output gear 246. The output shaft 212 is connected to the gear 246 by a pin """" -

A synchronous motor 248 (FIG. 5) is bolted to wall 218 by screws 250. Its armature shaft 252 is connected to an intermediate shaft 256 by a coupling 254. The latter is held in ^v bearing supports in the intermediate wall 224 and a fourth intermediate wall 258. '= -''' ■ -J ''-'--': -

A drive pinion 260 mounted on the shaft 256. It attacks ¹ In a 'gear 262 a, welches- sitting on the secondary shaft 264, which is seated in the walls 258, is supported 224 and 226 ". A second drive pinion 266 on the VielIe 264 It engages a driven gear wheel 268 on the shaft 270, which is mounted in the intermediate walls 226 and 224.

272 shows an electromagnetic clutch similar to the clutch 24O to establish any connection between shaft 270 and the

909846/04 8 4

To produce output shaft 212.

If the clutch 240 is de-energized and the clutch 272 is energized When set, the synchronous motor 248, which is energized from the control panel, as described below, develops a torque which is transmitted to the reduction gear of the gears 262 and 268. It can then be a controlled one Movement of the carriage can be performed in the X-axis direction. If the clutch 272 is switched off and the clutch 240 is switched on, it is possible to obtain a rapid transverse movement, by simply turning on AC motor 214. The electrical circuits for motors 214 and 248 are independent of one another.

The end of the beam 90 which is opposite the rod 40, is carried by a roller 276 (FIG. 23) which is mounted on a pin 278. The pin 278 is carried by a support 280 which is attached to a grip part 284 by means of a pin 282 1st. Dieter Passtell let screwed to the underside of the base plate 94 of the door 90. There are springs 286 provided to avoid deviations resulting from tolerances. The roller 276 runs on a track 288 which is attached to the edge of the table and lies in the direction of the X-axis.

The transverse depth of the beam 90 and its construction is sufficient in order to avoid inconvenient bends which would adversely affect the worker's readings when handling the wearer

909846/0484

- 2k -

the television camera moved over the drawing plate. ,

A suitable voltage generator for the Y-Aehs drive is shown at 290 (FIGS. 43 and Uk) . He is sitting inside a chamber. * 292, which is subordinated in a control chamber 300. This includes a television monitor scanner 296 (Fig. 1) which picks up the signals from the camera 128 and which enables the operator at the control room to observe the outlines on the drawing board and to pinpoint the camera over the desired points on the outlines of the drawing board.

The housing 292 contains the switching means for both the X-axis carriage and the Y-axis carriage. The X-axis parts have the same reference numbers with an added index.

The generator 290 is supported on the base of the chamber 292 and its anchor is in the horizontal direction.

The armature shaft 29 ¹ J is coupled to the drive shaft 296, which in turn is directly connected to a hand wheel 298 which is operated by the worker. The handwheel rests on the outside of the housing 292. It is rotated by the worker to cause the armature shaft 294 to rotate, thereby generating electrical pulses which are picked up by the synchronous motor.

The housing 292 is surrounded by a sheet metal jacket 300. In a

909846/0 4 84

The shaft 296 is mounted on the front wall 302 of the housing 292. The shaft 296 is also mounted in an intermediate wall 304. A secondary shaft 306 is also located in the walls 302 and 304 stored. A pinion 308 is seated on this shaft and meshes with a gear 310. The shaft 296 sits directly in the gear wheel 310. A drive gear wheel 312 is also connected to the shaft 306, which engages in the gear wheel 31 ^. This is connected to a handwheel 310, which by a Slot 318 in the sheet metal jacket 300 protrudes radially.

The hand wheel 316 is in bearing supports of the walls 319 and 320 of the Housing 292 mounted. The circumference of the handwheel 316 can be grasped by the worker when a fine linear adjustment in the Y-axis is to be carried out. Rough adjustments are made by turning handwheel 298. A direct connection between the handwheel 298 and the armature shaft 29 * 1 enables a quick adjustment in the Y-axis. The movement of the handwheel 3l6 for pin adjustment is made by the reduction gear reduced.

A torque transmitter unit 29O ¹ for the X-axis drive is contained in the housing 292. It resembles the unit for the Y-axis, although the unit for the electrical signal itself is designed in the form of a torque transmitter instead of a pulse generator. Just like the unit for the Y-axis, the X-axis control has a handwheel 322 for fine adjustment of the armature shaft position. The rough adjustment can be done with a handwheel

909846/048 4

which is operated by the worker.

When the pulse generator for the carriage is in the Y-axis direction As this axis moves, the pulses are sent to an electronic counter 326 (Fig. 3A) on the worker's control cabinet registered. A corresponding counter 328 is provided for the coordinates of the X-axis. If the pulse generator for If the carriage of the X-axis sends impulses to the cabinet, then the counters 326 and 328 produce visible symbols for both the position the X-axis, as well as the position in the Y-axis after the camera for reading with reference to a starting point on the Drawing is set. When the pulse generator moves the X-axis in a positive X-axis direction with respect to the starting point moves, the counter 328 numerically adds the pulses that have been generated for every 0.025 mm of movement. The counter subtracts the readings when the X-axis carriage is in moves in the negative X-axis direction. The reading from the counter 328 therefore indicates the net amount of the X attachment.

Corresponding readings are obtained from the counter 326 for the Y-axis position obtain. The counter adds and subtracts the pulses depending on the direction of movement of the Y-axis viagens.

The worker can set the camera button over the desired point on the outline, and can after this accordingly the relative position between the camera and the target point is centered on the television monitor, an X-axis button 330 and Depress a Y-axis button 332 (Fig. 3A) that controls the

9 0 9846/0484

Position digitizing circuit for the controller triggers and energizes and the X- axis coordinates and the Y-axis coordinates for the target point are registered on conventional computer punch cards · The latter is done on a conventional card punching machine 334 (Fig. 1).

If characteristic points are located in this way according to their X and Y coordinates, the net result is represented by a stack of perforated computer cards that have been produced on a perforated line. These data are then regularly entered into the computer already described, in which a parabolic curve is established between the measured points in order to obtain a continuous definition of the contour line for the characteristic lines on the drawing board.

Under certain circumstances it is expedient to eliminate any friction that results from the roller support by the roller 276 at the outer end of the beam 90. Unless the friction is a problem at this point, it 1st possible that the frictional forces slight errors in the cause X-axis readings owing to the resulting inflection of Trä gers 90. Therefore, it was a different device for End of -Abstützung Carrier 90 is provided (Fig. 47, 48, 49, 50). This device consists of an air bearing with an air manifold block 336 which can be bolted to the unsupported end of the bracket 90 '. Screw openings 338 and 340 are provided for this purpose. Parts of the carrier 90 with counter

903846 / (Η8Λ

pieces in the carrier 90 already described have the same reference numerals with an index.

The block 336 has an air distributor with an air inlet port 3 ^ 2, those with inner channels 344, 346, 348 and 350 in Connection. These channels run vertically and are in communication with the main distribution channel 352. At the bottom Side of the manifold block 336 are air-cushion plates 354 at-P screwed. These plates are provided with air jet openings 356, each of which is in communication with air distribution grooves 358 in plate 354. The inner surface of the plate 354 lays down against the surface of the rail 288 'which is arranged on the edge of the support bed for the drawing table'.

When air is supplied to duct 342 (FIG. 47), an air film is created between the lower surface of the plates 354 and the bearing surface 288 'of the track rail. This becomes the overhanging End of the support 90 'carried by the air film, which is smoothly works. In this way, the frictional forces that are normally associated with the support rollers can be eliminated will.

The drive system for the Y-axis carriage is shown schematically in the Fig. 54 shown. It contains a rotary field encoder and a ■ Rotary field receiver as already described. The output of the rotating field receiver is via the gearbox and the coupling parts transferred to the wall disk 100. The height of the turning

909846/0484

moment, which is transmitted by the rotary field encoder, is proportional to the electrical error signal, which is a measure is the voltage applied to each aggregate.

The electrical connection between the rotary field transmitter and the rotary field receiver is shown schematically in the Pig. 53 explained. the Stator winding 360 of torque receiver 290 and the stator winding 362 of the rotary field sensor 186 are stationary and lying in a three-wire circuit. The rotor 364 of the rotary field encoder 186 receives a signal voltage of approximately 110 volts AC. This rotor winding lies parallel to the rotor winding 366 of the torque receiver 290. The rotor 366 is connected to the load, in this case from the drive gear 190 exists. The drive rotor 364 is with the manually operated Wheels connected.

The receiver rotor shows exactly and follows every position movement immediately of the rotor 364. However, there is a lag because the rotor 366 is subjected to friction and inertial loads is. But since the Y-axis carriage has a smaller size receives external loads of this kind, the system explained schematically is sufficient.

The amount of torque received is proportional for the adjustment of one rotor shaft in relation to the other and is usually referred to as an error signal. For every physical position of the rotor there is a corresponding

9 09846/0484

corresponding voltage in the stator winding and in the output rotor. The three output voltages have relative heights and polarities, which determine the angular position of the rotor shaft with respect to the stator winding when a voltage is applied to the rotary field encoder rotor is applied. The X-axis carriage drive, however, has larger ones Inertial loads and frictional loads partly because of the relatively large mass that must be driven. Therefore the X-axis drive contains a control transformer 248 (Fig. 52) as well as a control transmitter similar to the one that has been described with reference to the Y-axis carriage. The control transformer includes a stator 368 that is connected by a three wire connection is connected to the stator winding 370 of the control transmitter. The rotor winding 372 of the control transmitter receives current in the usual manner with an input voltage of approximately 110 volts Alternating current. This rotor is rotated by the worker, as already explained. The output winding of the control transformer 248 is connected to an amplifier 374 (Fig. 51) and through a summing point 376. The voltage in the connection 378 between the rotor winding and the summing point is a measure of the error signal as it can be obtained by feedback of the position results. This position feedback is shown by a mechanical connection 380 in the schematic illustration. This connection exists between an output part of an intermediate gear and the rotor 382 of the control converter 248. The amplified error signal is applied to a two-phase AC servo motor conducted, which supplies power to the transmission 384. The engine itself is shown at 386. It's mechanical by a connection 388 with the drive part in the

909846/0484

Gear 384 connected.

The amplifier 374 includes a gain control for reducing the amount of displacement between the rotor 382 and the rotor 372 to a specific value. A DC tachometer unit 390 can be used to generate a speed signal which is applied to summing point 376 via line 392, which counteracts the error signal in line 378 if the movement of the rotor { 382 is too jerky. The system explained can be designed in such a way that it has a sensitivity of 3 ° relative movement between the drive shaft of the front wheel and the disk 140 of the X-axis drive.

909846 / CU84

Claims (5)

- 32 claims f lA coordinate axis drive for a coordinate pick-up device of drawings and the like, which are placed on a table, in which a mobile carrier is arranged in the direction of the Y-axis, which is carried at one end by a transverse part, which is at the edge of the table can be moved in the direction of the X-axis of the coordinate system, the carrier arranged in the direction of the Y-axis carrying an electrical pulse generator coupled to it, which emits a voltage pulse with every jump in movement in the direction of the Y-axis and is movable on a carrier on the mobile Carrier is arranged and an optical scanner sits on the support device for the pulse generator and wherein a second electrical pulse generator is arranged on the transverse part movable in the X-axis, which is in drive connection with the table and generates a voltage pulse with every jump in movement in the direction of the X- Axis gives off, characterized in that a driving and a driven electrical unit (186, 290) with rotating fields is provided, the electrically connected stators (362, 360) with several coils (51, 52, 53) and rotors (364, 366) interacting with them in phase, as well as a torque transmitting drive connection between the windings of the rotating field unit on the transverse part (44) and the carrier and a drive (364) operated by the operator for rotating the windings of the other electrical rotating field unit (290), whereby adjustments of the optical tactile 909846 / CU8Ä 19046R4 - 33 head can be machined in the Y-axis. 2. Device according to claim 1, characterized in that a second pair of electrical rotating field units (248) is provided, with stators (370, 368) with movable, electrically connected coils and wound rotors (372, 382), a manual adjustment of the rotor (372, 382) of one of the units of this second pair with reference to its sta- ^ gate (370, 368) on the rotor of the other of this second pair generates a torque and a mechanical drive connection between the rotor of the other of the second pair of units is provided with the transverse part (44), whereby the mobile carrier (90) can be adjusted in the direction of the X-axis and the angular position of the rotor (372) of the first of the two pairs of units being adjustable by hand. 3. Apparatus according to claim 1 and 2, characterized in that the electrical rotating field unit, which of the transverse part (44) is carried, consists of a control converter (248) and the associated unit consists of a torque transmitter, that the control converter (248) and the torque transmitter each have a fixed stator (368, 370) with several windings (51, 52, 53) and a movable rotor (382, 372), the rotor (372) of the torque transmitter being mechanically connected to the Manual adjustment device and the rotor (382) of the control converter (248) is mechanically connected to the transverse part (44), whereby the latter sends a position return signal to the rotor (382) 909846/0484 and that a servomotor with armature and stator is also provided, the stator of which is electrically connected to the rotor (382) of the control converter (248) is connected, this connection containing a voltage amplifier (37 * 0, which the error signal Reinforced in the rotor winding (382) of the control converter and a mechanical connection between the armature of the Servo motor and the transverse part (44) consists, whereby the probe head is adjusted in each X-axis direction, depending on the Direction of rotation of the rotor (382) in the control converter (248). 4. Apparatus according to claim 1 to 3, characterized in that the armature of the servomotor is connected to a DC tachometer voltage generator (390), the output of which is connected is connected to the input of the amplifier (374), and that the output of the tachometer voltage generator (390) and the output of the rotor (382) of the control converter (248) in a Siammierpunkt (376) are connected, whereby the output voltage of the tachometer (390) counteracts the error signal voltage of the control converter (248) when the rotor (372) of the torque transducer is adjusted by the operator with respect to the stationary stator (370). 5. Apparatus according to claim 1 to 4, characterized in that the probe head consists of a television camera (128) on the carrier (104) which has a lens which is located on one side of the mobile carrier (90) directly above the table surface ( 12) is arranged that also a television monitor circuit for 909846/04 * 4 Receiving the signals of the camera (128) is provided so that the operator can observe the position of the lens with respect to the target point, and that a digital circuit for recording the coordinate values of certain of sampled points is provided, which is electrically connected to the pulse voltage generators, so that the individual pulse voltages are counted and displayed, and certain points can be located with reference to a starting point in X and Y coordinates . 909846 / G484