DE383881C - Device for automatic control of the auxiliary feed of the grinding wheel slide on grinding machines - Google Patents

Description

Device for the automatic control of the feed of the Grinding wheel slides on grinding machines. The invention relates to a Cross feed device, and is particularly intended for use on cylinder grinding machines.

For certain grinding work it is desirable to use grinding wheels of relatively soft nature to be used, in which the binder between easily yields to the sharp grains and the dull and useless grains can break away, so that new and there are sharp grinding surfaces that allow faster grinding. if however, due to the softness of the binder, the disc against the workpiece too quickly is advanced, then the edges of the disc tend to crumble, or the disc will be damaged in other ways. With manual feed by the operator is dominated and thus subject to its whims and carelessness is that Feed once too slow, then again too fast, to make up for lost time to make, and the result is either poor work or excessive wear and tear of the Machine and the grinding wheel.

Furthermore, in the semi-automatic grinding machines known up to now the advance of the disc was operated intermittently, as it is usually with a ratchet wheel and latch was generated. With the feed operated by the ratchet wheel and pawl, the Disc sometimes pushed forward very quickly and too deeply into the workpiece will. As a result, the wheel is subjected to the heavy pressure of heavy grinding subject. This gradually subsides when the material is sanded off, until the feed is put into action again. and the cycle then repeats itself.

According to the invention, a quite even feed during of grinding achieved, so .that the wheel continuously with the previously determined Speed is moved, and much slower than when actuated at the absatzwese Advancement and yet with the same success. So the disc is at times not subjected to excessive pressure which creates premature loosening of the sharp grains; will therefore serve its purpose longer, .and .the sanding goes smoothly in front of you and the wear and tear of the machine remains limited to the smallest degree.

The purpose of the invention is therefore to create a device which constant feed generated for mutual movement of grinding wheel and workpiece, which is completely automatic, and which the disc with constantly uniform and predetermined grinding speed against the workpiece advances, "- what speed of irregular actuation on the part of the operator while-1 is no longer subject to the grinding activity once the disc is brought into contact with the workpiece for grinding. The operator can determine, «-which of the various uniform speeds in use is to bring: he can control the device by hand to the extent that he set it from one speed to another and adjust the feed can switch off or toggle. On the other hand, he cannot suddenly increase the speed change, also he cannot advance the workpiece by hand while grinding, before an automatic emergency shut-off device is not occupied is.

The invention in general is therefore that one exclusively automatic cross feed device is provided, which is particularly suitable for cylinder grinding machines suitable.

When grinding, especially when grinding raw castings or forgings, it is desirable to have three different predetermined feed rates: one fast feed that brings the disc right in front of the workpiece: a medium one Feed for grinding protrusions or burrs on forgings or castings, and a relatively slow or fine feed, which is then actuated, when the grinding wheel begins to penetrate the full workpiece. An important Accordingly, part of the invention relates to an improved device to create at which a number of predetermined speeds of the cross feed can be achieved, which can be made available to the worker at his discretion. These The device has absolutely nothing to do with the usual device in which a general increase or decrease in the speed of the entire cross-feed device is achieved as by means of a conical pulley on the drive shaft.

Another important part of the invention relates to the new and improved device, by means of which the cross feed to a specific one Point that can be determined beforehand with great accuracy, except for activity is set.

In the preferred embodiment, this comprises part of the invention a stop, a member which actuates the stop and is so attached, that a partial rotation is possible, a coupling on the transverse feed shaft and a positive wheel connection from this clutch to the one mentioned Element. The clutch is normally inactive, and adjustable on its own Means are provided for disengaging the clutch when the disc ends up of grinding is approaching. The link above rotates: then turns until it hits the stop and prevents the feed screw from advancing further. This activity is carried out by allows a friction connection between the drive shaft and the feed shaft.

Another component of the invention relates to the fact that a Device is provided by means of which the feed is easily adjustable for carrying out work on workpieces of very different diameters, this adjusting device being of an extremely simple nature.

The invention also relates to certain devices and Connections full parts, which are described below.

In the drawings, a preferred embodiment of the invention is for example shown.

Fig. I is a front view of one with the improved feeder device equipped grinding machine.

Figure 2 is a side view, partly in section, of the cross feed device in line 2-2 in Fig. i.

Fig. 3 is a front view of the adjuster, via dere-i the operator masters changing and switching the feed.

Fig. D. is a top view of the feed change and changeover switch, the different positions of which can be seen when actuated.

Figure 5 is a view of a section on line 5-5 in -AM. 3, on which the drum and the carrier, which actuates the slow and medium feed, can be seen; the parts are set for slow feed.

FIG. 6 is a view similar to that shown in FIG however, there are other parts of the X-device in the setting for medium feed.

Fig. 7 is a view of the drum and the couplings that make up the operate the fast feed of the grinding wheel; however, these parts are shown what they look like in the setting for slow feed.

Ahh. Fig. 8 shows certain parts of the position which they assume while the middle feed is set.

Fig.g shows the drum and the driver in the position in which the fast feed is activated.

Fig.io is a vertical section of the manually operated alternating and switching device, cut in the line io-io in Fig. 4 and i i.

A.bb. i i is a view of the switching devices, partly in FIG Section, cut along the line i i-i i in Fig. Io.

Fig. 12 is a side sectional view of certain parts of the are included in Fig 2, but on a larger scale.

Figs. 13 and 14 are front views of the two links of a coupling, taken in lines 13-i3 and i4-14 in Ab-b. 12th

Fig. 15 is a side view, on a larger scale and in part in section, the device for automatically switching off the cross feed.

FIG. 16 is a front view of a portion of that shown in FIG Device, which in particular represents the device, by means of which the in the stop engaging member can be adjusted by hand.

Fig. 17 is a view of part of the device by means of whose clutch is actuated, which actuates the automatic off switch.

FIG. 18 is a view of further parts of the device shown in FIG.

Fig.ig is a vertical section of the parts shown in Fig. 18, cut in the line ig-ig in the same figure.

Fig. 2o is a section of details of the sleeve holding the coupling actuated.

In the drawings, the improved cross-feed device is shown in FIG their application on a cylinder grinding machine of the usual type. These has a frame io on which a table ii is located, which extends in the longitudinal direction is movable. The drive headstocks 12 are adjustable in the longitudinal direction on the table i i and set up so that they hold the workpiece fixed on the table Set K (Fig. 2) to rotate. These parts have nothing to do with the invention.

The grinding wheel W is mounted on a wheel spindle 13 which is rotatable in the bearings 14 and 15, the bearings being slidable in a feed slide 16 on suitable paths, which paths are not shown, however. They are attached to the rear part of the frame io. The grinding wheel can be driven by a belt 17 running on a drive pulley 18 attached to the shaft 13, or some other type of drive device can be used.

The disc carriage 16 (Fig. 2) has a depending part i9 provided, on which there is a nut half 2o, which is with a cross slide screw 21, which in turn is worked up on a transverse feed shaft 22, interacts. The shaft 22 is in the bearing 23 on the frame io and in the bearing 24 .auf dem Frame part ioa rotatable. A weight 25 is by means of a rope or a chain 26 attached to the disc carriage 16 and pulls the carriage backwards and serves to compensate for the dead gear between the nut 2o and the cross slide screw 21.

The gear wheel 27 (Fig. 12) is movably mounted on the sleeve 28, which is keyed to the shaft 22 and an outwardly protruding flange 29 has, on which a ring 3o, made of friction compound, is attached. That Gear 27 is against the frictional deflection surface or ring 3o by an outer sleeve 31, which is wedged with the sleeve 28, but axially on this Direction can slide and has a flange 32, which is also with a friction ring 33 is provided, which is against the other side, which is not adjacent to the ring 30, applies. A spring 34 surrounds the sleeve 28 between the end of the sleeve 31 and the Federal 35. This spring pushes the friction surfaces until they reach the sides of the gear 27 take away. The collar 35 is screwed onto the sleeve 28 and is thereon in the Adjustable lengthways, thereby making the pressure of the spring 34 variable is.

The gear 27 meshes with the gear 36, which is on a short Shaft 37, which is fastened in the bearing 38 on the frame part ioa, is rotatable. The gear 36 engages in the teeth 4o which are loose on the coupling sleeve 41 mounted on the intermediate shaft 42 provided with coupling teeth at each end is. The sleeve 41 slides on the shaft 42 by means of the Rinzes 43 (Fig. 7), which in a known manner - can be operated by hand. The teeth 44 on the rear End of the sleeve 41 are attached so that they are in similar coupling teeth 45 one Federal 46, which is keyed on the intermediate shaft 42, engage.

The shaft 42 is rotatable in the ioa ibefindlichen on the gesture part Bearings 47 and 48 attached and has a conical gear 50 at the front end, which continuously engages in corresponding conical gears 51 and 52 (Fig. i i). Each of these wheels can rotate freely on the coupling shaft 53. The wave extends along the machine and is in bearings 54 and 55 (Fig. i i) and 56 (Fig. 3) rotatable. The shaft 53 is with the drive shaft 57, which in fixed bearings 58 (Fig. 3) and 59 (Fig. i) are carried in one axis. The step pulley 6o is attached to the drive shaft 57 and the belt adjustment plate 61 (Fig. I) slidable on the frame i o to bring the drive belt onto the steps of the pulley 6o to be able to push over. The feed rates of the entire preschool device can be used can thereby be strengthened or weakened in several stages.

The connections between the drive shaft 57 and the coupling shaft 53 are as follows. The drive shaft 57 has at its left end, seen in Fig. 3, a clutch ring 62 in position for engagement with the teeth 63, which adhere to the sliding. baren coupling ring 6d., which cannot be rotated on the coupling shaft 53 is located. The ring 64 is operated by the bracket 65 and also by other devices to be explained later. When the ring 64th in the Position is brought to the right, with its teeth 63 engaging in the coupling ring 62, In this way, the shaft 53 is driven directly from the shaft 57. This arrangement thus results in a rapid rotation of the shaft 53 from the shaft 57.

The sprocket 66 (ALL. 3) is mounted on the shaft 57 and meshes with the gear 67 on the shaft 68, which sihts in the fixed bearing 69 and has a pinion 7o which meshes with the gear 71 loosely on the Shaft 53 is seated. The gear wheel 7i is provided with finite coupling teeth 72, which are set up for engagement with the teeth 73 on the left hand side of the coupling ring 74. When the clutch ring is moved to the left so that the teeth 72 and 73 are engaged, the shafts 57 and 53 are connected by the gearbox formed by 66, 67, 70 and 71, and it is thus the slow rotation of the shaft 53 scored.

The bracket 65, which determines the position of the coupling 64, is on a Rod 74 (ybb. 3) attached, which is slidable in the bearing 75 and on her opposite end a driver 76 (Fig. 6) 'has a control cam disc 77, which is attached to the lower end of a vertical shaft 78 (ALL. Io) is. This shaft is rotatable in a sleeve 79, which in turn rotates in the fixed Bearings So and 81 (Fig. 3) is attached.

A feed switch lever 82 is keyed to the upper end of the shaft 78, and the hub of the lever 82 is provided with three notches 83 (Fig. q.) which can come into engagement with a spring bolt 84, which is attached to the fixed Support 85 is located. The bolt 8 serves to keep the fog $ 2 in the three different To hold positions. When the lever is in the position shown in Fig. is shown by solid lines, then is the position of the 1-bit 76 and the disk 77 which is indicated in AL'b.3 and 5. The clutch 6 is in mesh with the clutch teeth on the gear and the slow drive from the shaft 57 to the shaft 53 is carried out by the previously described back gear 66 to 71.

If the lever 82 differs from that shown in Fig.

moved into the position of the disc 77 shown in Figure 6 is, then the: Coupling 6 is coupled to the coupling ring 62 and so the direct one Drive switched from shaft 57 to shaft 53 at high speed. In the third position of the lever 82 (Fig. D.) The disk 77 is rotated. The rod stops, however, because the curved pieces controlling the curve are concentric Circles are. the drive connection is now explained, which is attached to the pinion d.o. on the intermediate shaft driven at two different speeds to operate the transverse displacement of the slide The coupling ring (Fig. i2) is As noted above, on his right (Fig. provided with coupling teeth which for Engaging with the clutch teeth 5 set up on the collar attached to FIG are. The coupling ring also has coupling teeth at its left front end provided, which for engagement with corresponding teeth on the hub 9o to your Wheel gi with internal toothing (Fig. I2). which can be rotated around the axis of the shaft: I2 is set up. A ring gear 92 with internal teeth is on the frame part io attached, concentrically with four shafts and close to the wheel gi with Internal gearing. The double pinion can be rotated on the eccentric sleeve, which is attached to the shaft and thus rotatable. By the rotations of the shaft 2 and the eccentric sleeve 9, the scoring 93 is rolled off, on the inside of the toothed rings gi and 92.

Since these toothed rings 9i and 92 differ by one or two teeth, this results in what is a very slow continuous rotation of the gear wheel 91 has the consequence.

So the clutch ring is moved to slow the translation, that it comes into engagement with the abe go of the gear 9i. This intervention has the effect relatively slow rotation of the gears 36 and 27. For the faster translation, the coupling ring 41 is pushed backwards, for direct engagement with the toothed tooth keyed onto the shaft 42 Bunde 45, 46. The differential gear is put out of action.

The displacements of the coupling ring 41 are of the aforementioned causes vertical shaft 78 from. A second one sits on the hub of the cam plate 77 Disk 95 (Fig. 3, 1o, z2). The disk 77 is keyed onto the vertical shaft 78. The disk 95 works together with the driver fork 96 (Fig. 7), .the on a Rod 97 is attached, which is slidable at right angles to the rod 74 and on the rear end of which the coupling bracket 43 is attached.

The mutual positions of the disks 95 and 77 and the rods 74 and 97 with the driver 76, 96, which the three positions of the lever 82 according to Fig.4 are clearly marked in Figures 7, 8 and 9. As stated, turns the shaft 53 in the extended position according to Fig. 4 slowly, in the two other positions quickly. In Figs. 7 and 8 it can be seen that the driver 96 is concentric Parts of the disc 95 (for the shaft 42) holds and that the driver in both positions 96 and the rod 97 in the position at the very front (engagement 90, 41). It is thus thereby caused that the coupling sleeve 41 in the vicinity 9o of the inside toothed ring 9r engages, as provided in Fig. 7, whereby the slow Translation between the shaft 42 and the pinion 40, 4 1 is switched on. By the movement of the lever 82 from the extended position shown in Figure 4 so only two different rotations of the shaft 42 and thus two different achieved rapid transverse displacements of the grinding wheel carriage, namely firstly Wave 53 fast, wave 4.2 fast, and second wave 53 fast and wave .2 slow.

However, if the lever 82 from the middle position according to Fig. ¢ is switched to the lowest position (Fig.4), then the driver 96, the rod 97 and the bracket 43 moved backwards, as in Fig. 9, and the clutch teeth 44 and 45 are nested to provide direct drive between the shaft 42 and the pinion 40 to win. So then hit the fast rotation of the shaft 53 together with the likewise rapid rotation of the shaft 42, and it arises a third fastest revolution of the shaft 42.

During this latter movement of the lever 8 '? remains the driver 76, as stated, with concentric parts of Scheike 77 in close contact, when it rotates in the direction of arrow a in Fig. 6. The driver 76 therefore remains in position together with the coupling ring 64 and engages in the coupling ring 62, which is located on the shaft 57, a. For quick is So according to the invention, a direct drive from the drive shaft 57 to the Coupling shaft 53 is provided, the same from the middle shaft 42 to the Friction gear 27.

The drive connection between the 53 and the shaft ¢ 2 are zwec s Switching of the feed changed in the following way. A coupling ring zoo (Fig. Z r) is wedged on the shaft 53 and slides on it under the action Bracket red in positions in which it fits into the coupling teeth on the conical Gear 5z or the conical gear 52 engages. The ioz bracket is on one Rod fixed in red, soft slides in the fixed bearings and and at one end is articulated to an arm which forms part of the driver raw on the attached to the bolt (Fig. zo). This bolt is attached to the rod rod. The driver 1o6 is in engagement with a third cam disk ro8 of the shaft 78 (Fig. io and m), which is wedged at the lower end of the sleeve 79. The location of this Disc 1o8 is pulled by a hand lever (Fig. 3 and 4) to determine which one is above is wedged on the sleeve 79 and is just below the lever 82.

The disk io8 and parts interacting with it are shown in Fig in the drawn in "which decorative coupling ring roo is in engagement with the conical gear 52. It becomes so the gear So and the 42 in the direction of arrow b in Fig. 1z rotated, and the disc slide is from the workpiece promoted away. The corresponding position of the lever io9 is the upper one in Fig.4 marked dotted lines. When the lever is pulled to the lower dotted position in Fig. ¢, then 'the coupling ring roo halfway between the there will be two conical gears 5i and 52 with neither of these Wheels are engaged. The cross feed is therefore switched off. Moves you move the lever ro9 to the position shown in solid lines in Fig. 4, then the coupling ring zoo meshes with the conical gear wheel, the shaft ¢ 2 is in the opposite direction to that of part b driven un the disc carriage is against the workpiece The lever rog has three notches i io provided, which in Zusaniniemvirkung with your resilient bolt i i i, the dotted in Lines drawn in Fig. 3 holds the lever in one of the three positions.

The device described so far enables the disk slide advancing forwards or backwards at any of the three v appeared speeds, , the fast, the medium or the slower; it also enables de-i Vorschti'.i completely switch off and switch over, with the switchover or switch-off device operated manually by your operator. A device for automatic Switching off the cross feed at a previously determined point consists of the following: The gear wheel 120 (Fig. 2 and 12) is freely rotatable on the sleeve 121 (Fig. 12 and 20), which is slidably attached to the front end of the transverse front end shaft 22 and is provided with keyways 122 suitable for receiving keys 123 (Fig. 13) which are pinned into corresponding keyways on the shaft 22. the Spring 12.1 is around the shaft 22 and is on it with the nut 125 and your Washer 126 attached. The opposite end of the spring is engaged with an inner shoulder 127 on the sleeve 121 and, when switched on, pushes the sleeve to the rear or to the right in Al-, b. 12. This movement of the sleeve will on the gear 120 by means of the shoulder 128, which is located on the outside of the sleeve 121 located, transferred.

The toothed ring 129 (Figs. 12 and 13) is on the back of your gear 12o attached; the 1, single teeth on it are irregularly divided and such such that they fit into corresponding teeth on collar 130 (Fig.12 tuii 1: 1), all of the shaft 22 is keyed to engage. The ring 129 and the collar 130 has a clutch which is only switched on in a single position can be. The ring 132 (fig.12 and 13) is screwed to the right end the sleeve 121 is fixed and takes the gear 120, moved to the left, finite, so that the clutch is switched off when the sleeve 121 moves in this direction.

The pawls 133 (Fig. 12) are mounted in the keyways of the sleeve 121 and are rotatably mounted by pins 134 on that sleeve. The outer edges of the pawls 133 engage a grooved ring 135 which slides on the sleeve 121 and is locked by the bracket 136, which will be described below. In the keyways of the shaft 22, ribbon springs 137 are attached which, in their normal position, force the pawls 133 outward into the position in which they engage in grooves on overhanging axes and lean against them with their shoulders locking. The collar is thus pressed to the left (Fig. 12.1. If the parts are in this position, then any movement of the sleeve to the right under the pressure of the spring 12.1 can prevent the coupling elements from engaging and these requirements The gear wheel rotates freely on the sleeve. The gear wheel i2o engages in a tickle ld.o (A11. i5), which is rotatable on a bolt that is fastened in the frame part io. The gear wheel i.L2 is on the tickle i.Lo attaches and grips in glas tickle i: 13 which is located on arms, un = 1 at the outer end of the bolt can move freely within part of a turn. If the switch-off device is not in its upper position: If it is locked, i.e. inactive, it will come to the hanging position below the bolt on the arm 1: 1.1 by virtue of its weight Stop i: 16 can hit on The end of an arm that is rigid on a fixed part of the frame is located. A tickle is found at the end of a bolt that slides in a sleeve and has a keyway which cooperates with the pin in the sleeve so that the tickle is twisted against the sleeve. The sleeve rotates in the hub z52 at the end of the arm i: 1.L. At the front of the sleeve, the arm 153 is articulated by means of a bracket which carries, which is located at its end and in which a spring-loaded; is slidably attached. At its rear end, the bolt is smaller in size and designed so that it fits into the concentrically arranged holes which are attached to the enlarged outer end of the arm 1.1.1. If one pulls the bolt out of the holes, then the arm can be rotated and with it the tickle thereby the arm i: 1.1 moves around the periphery of the gearwheel. The spaces between the holes 156 in the arm idq are such that the movement of the bolt from an adjacent hole in one of the grinding wheels corresponds to an eighth of a thousandth of an inch, which in turn corresponds to a reduction in the circumference of the workpiece by a quarter of a thousandth. To the bolt 148 is the. Spring 156 within the sleeve 149 and holds the pinion 143 in such a position that the gear 142 is in mesh. At the front end of the sleeve 149, the bolt 148 is elongated and provided with a handle 158 by means of which the pinion can be withdrawn when quick adjustment of the arm 144 in relation to the gear 142 is desired.

The arm 144 with its stop segment 145 is thus around the gear 423 adjustable. But when it is set, it moves with the gear 142. When it grips the stop 146, it prevents any further rotation of the gear. Since the gear 142 by means of the pinion 14o, the gear 12o and .die connected Coupling members 129 and 130 inevitably connected to the cross feed shaft 22 is, this engagement of the stop segment 145 with the stop 146 limits the Forward movement of the feed screw spindle and consequently also of the disk slide. Even after parts 145 and 146 come into contact, the rotates off of the shaft 53 from driven gear 27 on the bushing 28 of the shaft 22 further, until the operator switches their drive off or over; the rotation of the wheel 27 is made possible by the friction drive between gear 27 and shaft 22.

Even if the device for switching off the feed of the grinding wheel is a very reliable one, so is the movement of the gear 142 and the Limit stop originating arm 144 to a portion of a revolution, which one corresponds to much smaller parts of one revolution of the shaft 22. It is therefore impossible to actuate a large advance of the disk carriage when the gear 142 is connected to the shaft 22, under normal working conditions of the machine. A device is therefore provided in which the coupling members 129, 13o are switched on automatically when the feed of the grinding wheel has ended. This facility is described below. -The bracket 136 (Fig. 12), which actuating the sliding ring 135 is attached to the end of the lever 16o (Fig. 3), which sits loosely on the vertical shaft 78 and has an arm 161 that follows the opposite side of the shaft extends. At the end of the arm 161 is the bolt 162 (Fig. 17) attached, which is flat by a spring 163. The bolt 162 is in line with rod 164 (Figs. 17 and 18) which are in fixed bearings 165, 166 and 167 slides; it has teeth 168 at its rear end, which are inserted into the pinion 169 which is in the fixed bearing 170 and engages in I71 (Fig. 19), which in turn is rotatably attached to the bearing in the fixed plane. The worm wheel is attached to the shaft 174 which is within the vicinity of the gear 171 and engages in the feed screw 2I for the grinding wheel. The and 173 slides are provided with cooperating friction surfaces, which by the Spring to be brought together. can be seen in Fig. I9.

j The rack 16: 1. becomes by virtue of these connections with the Disc slide can be moved forward @ in temporal relationships until they are at engages the bolt in arm 161. If the rack continues to move forward are set in the lever I6o and the bracket because of which the sliding ring . I2) is pushed further so that (from locking interlocking 'the in the wedges Arms of the pawls move inward, allowing spring 124 to slide into the Coupling the coupling member pushes in and thus the 12o etc. in drive offset as soon as the irregularly divided teeth of the two coupling members in Line are what only happen at one position on one revolution of the shaft 22 can. After this, the gear and the arm will move, attunement with the shaft is actuated; further a until the stop rotating the shaft 22 and the 21 are then impossible. The tension on the bolt is strong enough that that without compression to overcome that which the Klin ribbon springs i ken in engagement with the wedges I23 the tooth and the friction is significantly stronger than the wheels and so that the mutual Ausi the spring like these gears cannot be changed by one Pressure of the spring. When moving to a workpiece with a larger diameter, then the rod must be brought forward so far that it catches the bolt I62 accordingly actuated earlier. To this end, pre-I8o (Fig.

is one seen which slides in a fixed bearing on the frame part Ioa and also in the ring I82 which is attached to the rod. The handrail I8o is provided with a front and nut button the button I83 and rear. The hand bar can be pulled forward, which means that the rack can only be pulled forward if the Reilammt, ng between the gear wheels and L73b is overcome. When the rod 164 is positioned so that it actuates the coupling members 129 and 130 at approximately the desired point, then the adjustment of the disconnection device can be achieved by adjusting the arm 144 around the gear 142 according to the indicator device previously described. The hand bar 18o is freely movable to the rear; accidental pressure applied to it will not disturb the setting of the rack 16: I and the gears 171 and 173.

Very fine adjustment of the point at which the rack 164 and pin 162 are actuated is not necessary as long as the coupling member 129 is released into engagement with the member 130 during part of the same rotation of the traverse feed shaft 122.

It goes without saying that other well-known types of frictional connections can be used between the lever 161 and the worm wheel 173; necessary is just a friction device that is strong enough to do the force of the springs 163 and 137 to be overcome.

A device is also provided for switching off the coupling members 129 and 13o when the feed device is switched over. This device consists of the bracket igo (Fig.3 and 17), which connects the upper and lower parts of the sleeve 79 and is finitely provided with a set screw igi, which engages the arm 161 of the shaft lever 16o. As described above, the switch lever iog is located on the sleeve 79 (Fig. Io) at the top and the switch drum io8 at the bottom. If the switching lever is set to a backward movement (Fig. 4), the adjusting screw igi engages the arm 161 and moves it, overcoming the resistance of the spring 163. As a result, the bracket 136 is set in motion and the ring 135 is withdrawn, so that the spring 12... 1 (FIG. 12) is compressed and the pawls 131 engage in the overhanging parts of the wedges 123. As a result, the coupling members 129 and 130 are decoupled.

The collar 182 on the rack 164 is mounted so that it strikes the rear part of the bearing 165 as soon as the rack has moved the lever 16o so far that the pawls 133 are released and the coupling members 129 and 130 have come into engagement.

From what you have said it can be seen that faster, mean and slower Advance of the disc slide is provided, as well as switching of the \ -orsclitiltes at each cycle, the choice of the speed spring time to the operator is due. At the same time a device is provided which prevents that the operator pushes the target slide forwards by hand; it becomes through it achieved that the feed with the previously determined speed, which for the grinding wheel on the machine is suitable. The switch-off device is such that it can be operated with extreme accuracy, is also the setup of this device is so simple that it is easy to operate.

It is assumed that in ordinary operations of the machine on raw castings or forgings, the operator touches the grinding wheel with the rapid advance will bring forward until the disc has the irregular ridges touched on the workpiece. He will then switch to the middle feed, whichever is maintained until the disc attacks the core of the casting or forging. It is then switched to slow feed for normal grinding activity execute, which goes on until the switch-off device automatically comes into action. Then the operator switches the feed using the lever i turned and also adjusted the advance lever 82 of the camshaft 78 so as to move the disc to be able to withdraw quickly. The feed activity is therefore entirely automatic, While it is controlled by the operator at all times.

Should it prove to be desirable, add a little touch after the feed is switched off automatically by the switch-off device has been, then the pin 155 can be fine-tuned against the pressure of its Pen can be pulled out and do two or more strokes as you wish will. This sets the pinion 143 in motion and thereby the arm 1-d. moved backwards with respect to the stop i.16. Then the grinding wheel can automatically to be pushed forward again a little until it comes into contact with your species strike 1: I6. It should be noted, however, that this fine adjustment of the feed is only actuated can be when the coupling members 12 <) and 130 are in engagement.

Claims (6)

PATENT CLAIMS; i. Device for automatic control of the auxiliary feed of the grinding wheel slide on grinding machines from the drive shaft, characterized in that the feed of the grinding wheel against the workpiece takes place exclusively automatically and constantly uniformly at each of a number of different feed speeds that can be selected by the operator as required. 2. Apparatus according to claim i, characterized in that the two coupling sleeves (64, 41) of the couplings on the one hand between the drive shaft (57) and one with this directly or indirectly coupled shaft (53), on the other hand between a of the latter adjustable cross shaft (42) and one with this directly or indirectly coupled drive pinion (40) for the auxiliary shaft (22) from one of Camshaft (78) adjustable in several positions can be controlled by hand, the cams (77, 95) used to move the clutches (64, 41) a third cam (io8) which is used to move a coupling sleeve (ioo) a bevel gear change transmission connected between the coupling shaft (53) and the transverse shaft (42) (5o to 52) is used. 3. Apparatus according to claim 2, characterized in that the The camshaft (78) can be adjusted in three positions by means of a hand lever (82), of which due to the design and mutual arrangement of the two cams (77, 95) the first (slow) the indirect drive from the drive shaft (57) the coupling shaft (53) via a countershaft (66 to 72) and also the indirect drive from the transverse shaft (42) to the auxiliary shaft (22) via a countershaft (9o to 94), the second (middle) direct drive from the drive shaft (57) to the Coupling shaft (53) through coupling (62, - 63) with indirect drive from cross shaft (42) on stand-by shaft (22) as before and the third (fast) position with immediate Drive from the drive shaft (57) to the coupling shaft (53) provides the direct drive from shaft (q.2) to shaft (22) caused by coupling (q4, q.5) while independent from adjusting the camshaft (78) to the cam (1o8) by adjusting one Hand lever (1o9) in three positions forward or reverse gear or standstill the auxiliary shaft (22) by moving the coupling sleeve (iao) of the gearbox (5o to 52) brings about. Device according to claim i, characterized in that for the purpose of automatically switching off the feed of the grinding wheel slide after completion of a certain advance, the friction gears (30, 33) with the drive wheel (27) coupled to the stand-by shaft (22) via a front end of the Additional feed switchable clutch (I29, 130) with a fine stroke adjustment (i4o to 158) in connection, which has a rotatable and adjustable arm (1d. 4) with a segment (145) which is held in place by a fixed stop (1q.6) and thereby switches off the feed feed: 5. Device according to claim 4, characterized in that the can only be switched on in one rotary position Clutch (129, 130) to start the fine stroke adjustment (i4o to 158) of one through the screw (21) of the auxiliary shaft (22) axially displaceable and Stop rod (16q.) adjustable to stroke by means of a stop spring bolt (162) provided adjusting lever (16o, 161) is closed in that the pawl lock (133) of the movable, through a gear (12o) with the fine stroke adjustment (14o to 158) standing in drive connection coupling part (129) canceled and thus the spring force (124) serving to move the part (129) is released. 6. Device according to claim q. and 5, characterized in that for uncoupling the coupling (129, 130) for automatic provision when switching over the feed device on the hollow selector shaft (79) the control lever (1o9) rides in the adjusting lever (16o, 161) influencing bracket (igo) is provided, which by means of adjusting screw (191) when switching to the arm (161) of the control lever acts and it counteracts the effect a compression spring (163) adjusts its stop bolt (162) to release the clutch.