US1321203A

US1321203A - Planer.

Info

Publication number: US1321203A
Application number: US20224017A
Authority: US
Inventors: George E Greenleaf; Harold L Blood
Original assignee: Niles Bement Pond Co
Current assignee: Niles Bement Pond Co
Priority date: 1917-11-15
Filing date: 1917-11-15
Publication date: 1919-11-11
Anticipated expiration: 1936-11-11

Description

G. E. GREENLEAF AND HKL. BLOOD.

PLANER- APPLICATION FILED 007.19. 1916. RENEWED uov. 15.1911.

1,32 1,203. Patented Nov. '11, 1919.

3 SHEETS SHEET I.

T RNEY G. E. GREENLEAF AND H. L. BLOOD.

FLANER.

APPLICATION mzu ocr. 19. ms. RENEWED NOV- 15.1911.

1 ,32 1 ,203. Patented Nov. 11, 1919.

3 SHEETS-SHEET 2:

& 'HY/EQTORS HZEZZL. 5 r B "2%1/ 7 %%O RNEY I G. E. GREENLEAF AND H. L. BLOOD.

PLANER.

APPLICATION FILED 001.19, I916.

RENEWED NOV. 15.1911.

Patented Nov. 11, 1919.

3 SHEETS-SHEET 3.

INVENTORS E. 11% 5M UNITED STATES PATENT OFFICE.

GEORGE E. GREENLEAF AND HAROLD L. BLOOD, OF PLA INFIELD, NEW JERSEY, ASSIGNORS TO NILES-BEMENT-POND COMPANY, OF JERSEY CITY, NEW JER- SE'Y, A CORPORATION OF NEW JERSEY.

PLANER.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Application filed October 19, 1916,Seria1 No. 126 -522 Renewed November 15, 191 7. Serial No. 202,240.

To all whom it may concern:

Be it known that we, GEORGE E. GREEN- LEAF and HAROLD L. BLOOD, citizens of the United States, and residents of Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Planers, of which the following is a specification.

It will be understood that when we refer to a planer we intend to include any mechanism, particularly a machine tool, which comprises an element (such as a work carrying table) adapted to travel forward and backward, and an element (such as a cutting tool) cooperating with the table and provided with means whereby relative transverse feeding can be effected between the said element and the said table; and it Will be further understood that with certain obvious modifications the invention can be applied to a planer or other machine in which the tool instead of the work support is reciproc'ated.

The invention relates particularly to planers having a power actuated tool feeding device which is automatically controlled, preferably electrically, by means of the reciprocating planer table, and which preferably comprises a motor, such as an electric motor, independent of the main planer driving means; and the invention is especially adapted for a planer having a reversible electric motor directly connected to the reciprocating table to drive it, but, as concerns certain features, it is not limited to a planer having such a drive motor.

' One object of the invention is to provide a planer having a power feeding device and means for causing the said device to operate under one set of conditions during the preliminary adjusting of the tool or tools and under another set of conditions during normal feeding, each set of conditions being particularly advantageous for the work being done. When the feeding'device 1s a separate electric motor the connections are such that the current has one circuit during adjusting and another circuit during feeding. An electric motor when used is preferably so connected that during feeding it rotates always in the same direction.

Another object of. the invention is to provide a planer having a power feeding device or motor and also having a master controll ng device or switchsupplemental to and independent of the device or switch which normally controls the feeding de-- vice or motor during ordinary operation, this master controlling device or switch preferably being manually operable and adapted to operate the feeding device or proved way of either the drive motor or the.

feed device, or both, by means of the same controlling mechanism.

Other objects of the invention will be apparent from the following specification and the claims. 1

The invention can be embodied in any one of a number of ways, particularly as concerns the mechanical features thereof; but in order that one embodiment of the invention may be clearly understood, we have shown in the drawings and will herein describe a planer, the mechanical construction of which is similar to that set forth in the Greenleaf and Keefer Patent No. 1,299,192 dated April 1st, 1919. For details of the construction in addition to those herein set forth, reference can be had to the said patent. Some of the electrical features of the invention are also similar to those set forth in the said Greenleaf & Keefer patent. However, it will be understood that as concerns both the 'mechanical and the electrical features,

the drawings and the description are to be understood as merely illustrative and are of the drawings, 1 represents the planer bed, 2 the reciprocating table, 3 and 4 the uprights or housings and 5 the arch connecting the uprights. Driving mechanism is provided for reciprocating the table 2 on its bed, and so far as certain features of the invention are concerned this driving mechanism can be of any usual or preferred form. We prefer, however, to use an electric motor which is directly geared to the table and which is reversible to effect the reciprocation thereof, such a motor having especial advantages in connection with a laner embodying the more characteristic features of our invention as will fully appear. A reversible electric motor is indicated in the drawings at 6, the gearing connections between it and the table being of any usual or preferred form. When such a motor is used there is provided a controller 7. F or operating certain parts ofthe controller and for other purposes there is provided a pilot switch 8. This switch is operated by means of a rod 9 connected to levers 10 and 10 which-are engaged respectively by dogs 11 and 12 secured to the reciprocating table.

These dogs are adjustable to regulate the len th of the stroke.

ooperating with the reciprocating table to act upon work carried thereby, there are one or more cutting tools. So far as the broader phases of our invention are concerned, the number of tools and the relative positions of the tools are immaterial. :We prefer, however, to provide four tools as shown in the drawings.

illustrated .there is a vertically movable cross rail 13 which is fitted to vertical guides on the uprights 3 and 4:. Transversely movable along the cross rail 13 are one or more (in this case two)

tool heads

14 and 15.

Preferably also there are provided two side tool heads 16 and 17 which are vertically guides on the uprights adjustable along the 3 and 4.

For moving one or more of the tool heads either to effect reliminary adjustment of the tools or to e ect feeding thereof during operation of the planer, weprovide a power device which by preference is electrically controlled and which also by preference is a motor generating power independently of the main planer drive. An independent electric motor constitutes the simplest and most advantageous power device for. the purpose ofv our invention, and such a motor has been shown for the purpose of illustrating the invention. 1 In the drawings the motor is indicated at 18, it preferably being mounted upon the arch 5.

For connecting the motor with the tool heads we prefer to use mechanism which,,

- as aforesaid, is similar to that set forth in the Greenleaf & Keefer application Serial No. 228,809. It will be necessary herein to In the construction refer only to the essential features of this mechanism as reference can be had to the be operated manually if desired by means of a crank such as shown at 23. upon each of these screws is a bevel gear 23 which is connected with a bevel gear 24 loosely mounted on a transverse shaft 25 rotatable in bearings on the cross rail 13.

- By means of clutch elements splined to the shaft 25 and controllable respectively by the hand levers 26 and 27, either of the gears 24 can be connected with the shaft 25 so that when the shaft 25 is rotated the corresponding screw 22 will be turned to raise or lower the corresponding slide 21 and the tool carried thereby.

Transverse threaded screws 28 and 29 are provided to respectively control the transverse movements of the tool heads 14 and 15, these screws being parallel to the shaft 25 and similarly mounted. The shafts and screws 25, 28 and 29 can be moved manually when desired, as for instance, by means of a crank 30 as indicated in Fig. 2. In order that the shafts may be rotated by power, a spur gear 31 is mounted at one end of the cross rail in position to mesh with pinions 32, 33 and 34 detachably mounted respectively on the ends of the

shafts

29, 25 and 28. Each of'these pinions is preferably in the form of a .click box having a reversible ratchet device which, for each position of adjustment, permits transmission of power from the pinions to the shafts in one direction only. The con-.

struction is therefore such that by putting in place or removing the click boxes and by properly adjusting the ratchet devices thereof one or ,inore of the shafts or screws can be intermittently moved in one direction or the other,-as desired, when the gear 31 is oscillated; or one or more of the shafts or screws can be continuously moved in one direction or the other, as desired, when the gear 31 is continuously moved. For actuating the gear 31 there is provided a crank arm 35 at one side of the gear and a gear 36 at the other side thereof, both of these devices being loosel .inoimted. By means of a suitable clutc mechanism, either the crank 35 or thegear 36 canbe connected rod. 39 and an adjustablepin 39" the said Splined gear and feed plate being connected to gether and driven by means of a bevel gear 40. Two

vertical shafts

41 and 12 are mounted on the

uprights

3 and 1 and are driven by the motor 18 through worm and wheel gearing at 413 and 44. Splined on the shaft 41 is a bevelgear 45 which meshes with the aforesaid bevel gear40 andthus transmits power to rotate the gear 36 by means of the gear 37 and to oscillate the crank 35 by means of the feed plate 38 and the connected rod 39. It will be seen that if the motor be operated to rotate the feed plate 38 through a definite angle, as for instance throngh a whole revolution or a half revolution, and that if the gear 31 be conneoted with the crank 35, one or more of the

shafts

25, 28 and 29 will be rotated in one direction or the other as required through a definite angle, thus moving one or the other or both of the tool heads to the right or to the left as required or moving one or the other or both of the slides 21 upward or downward as required. If the motor 18 be operated continuously in one direction or the other and if the gear 31' be connected with the gear 36, then either or both of the tool heads can be moved contin uous'ly in either direction as required or either or both of the slides 21 can be moved continuously in either direction as required.

For the, urpose of adjusting the cross rail 13 vertically, twoscrews 46- and 17 are.

provided which are connected by means of suitable bevel gearing with a transverse shaft 18 connectible with the motor 18 by means of gearing 19 and a clutch 50 man ually operable by means of a lever 51. It will, be seen that by engaging the clutch 50 and starting the motor-18 in one direction or the other the cross rail 13 may be raised or lowered 'as required.'

The side tool heads 16 and 17 can/be provided with cross slides and ot r means of tool adjustment as required/suchparts being shown in Fig; l but omitted in'Fig. 2 "for the sake of clearness. Forcon'trolling the vertical movement ofthe side-heads ver? tical screws 52 and 53 are provided;

56 carried by the corresponding tool "head.

By rotating this shaft 56 either manually or by power, thetool head may be raised or lowered. For applying power to, the

shaft 56 of each tool head there is provided Y a bevel gear 57 which is splined to-the corresponding

vertical shaft

41 or 42; Each gear 57 meshes with a gear 53andthegear ,58 drives a mechanism-59 which is similar to that already described for applying power to the, shafts 25, 28 and'29. A repetltion of the description is-unnecessary, and

it will be understood that when the motor is rotated through a definite angle either or both of the tool heads 16 and 17 can be raised or lowered as required through a definite distance, and that when the motor is rotated continuously either or both of the tool heads can be moved continuously upward or downward as required. It will be observed that the amount of movement of either side head can be adjusted independently of theamount of movement of the cross heads.

For controlling the flow of current to the feed motor 18, there is provided a motor operated limit switch, it preferably though not necessarily being operated by the feed motor itself. This limit switch is indicated at 60in Fig. 1, it being mounted on onecable which is so supported as tohold the switch atapoint within convenient reach of the operator, Because of this preferred form of mounting the master switch is commonly known as a pendent master switch. The full purpose of the master switch and the electrical connections therefor will be explained hereinafter. Referring now more especially to the electrical connections as shown in Fig. 3, it will be noted that the feed motor is indicated by the reference character 18 as in the other figures. The feed motor 18fis' provided with a shunt field winding 62 and connected in series with thetarmature of the --motor is a suitable resistance. Preferably this resistparts being indicated at 63 and the other of the parts being in the form of a series field winding as indicated at 64:. It will be understood, however, that so far as concerns certain phases of the invention one or the; other of these parts may be omitted.

For controlling the operation of the feed motor a starting switch is provided as indicated at 65, this switch preferably formin a part ofthe switch 8 heretofore mentione as a pilot'switch operated by the reciprowith the table reciprocations, and we do not connected in the wayv shown. Preferably,

the startin switch 65 controlsv the motorindirectly y means of an electromagnetic I -.relay switch 66. This relay switch 66 and the actuating magnet 67 therefor can conveniently be mounted as a part of the con- .cating table. It will be understood however, that when reference is made to a'tab le operated switch we mean to include any switch which is operated in synchronism :mean' to limit ourselves to a switch directly fre troller shown at 7 in Fig. 1. In conjunc-u tion with the feed motor there is provided a transfer switch 68 preferably of the three pole double throw type. For normal operation of the feed motor to effect intermittent feeding the transfer switch 68 is in its upper position as shown in Fig. 1.

The circuit for the coil of the relay magnet 67 extends from the positive lead 69 to the coil and from the coil it extends through the connection 70 to a stationary contact 71" of the starting switch 65. The switch is provided with another stationary contact 72 which is connected by means of a wire 73 with the negative lead 74". A movable contact 75 on the switch 65 is adapted to connect the contacts 71 and 72, thus completing the circuit through the magnet 6-7 and causing the core thereof to be lifted to close the switch 66. When the switch 66 is closed a circuit is completed through the feed motor as follows: from the posi tive lead 69 through the central pole of the switch 68, the switch 66, the motor armature, the resistance 63, the right-hand pole of the switch 68-, the series field 6a and back to the negative lead 7 1*. It will be understood that theshunt field 62 is con tinuously energized through the wire 76. The motor therefore starts operation and by means of the mechanical connections that have been described, serves to move one or more of the too], heads in the desired manner. By providing shunt and series fields of the required strengths and by varying the amount of the resistance 63 in the circuit the torque and speed of the motor can be regulated as desired. The resistance 63 serves to reduce the danger of injuring the motor in case one of the tools becomes jangned or for any reason fails to move This ope-ration of the motor will continue until the relay magnet is deenergized to permit the switch 66 to open. The magnet can 'be de nergized by opening its circuit at the starting switch 65, but preferably there is provided a limit switch which acts automatically to open the circuit after the motor has rotated to a predetermined extent or after the tool or tools have been moved to a predetermined extent. Mention has already been made of the limit switch which is mounted on the shaft 11 and is therefore movable to an extent proportionate to the extent of movement of the motor. The switch 60 is provided with three

stationary contacts

77, 78 and 79 and with three connected

movable contacts

80, 81 and 82. The contact 81 is a ring continuously engaging the contact 78, and the contacts 80 and 82 are interrupted rings adapted respectively. to engage the contacts 77 and 7 9 alternately as the shaft is rotated. To complete the circuit from the switch 60 to the switch the connection 7 O is constructed in two parallel sections 7 0 and the section 70 connecting the contacts 77 and 71 and the section 70* connecting the contacts 79 and 71, which latter contact is similar to the aforesaid contact 71. With the switch 60 in the position shown in Fig. 3 the circuit extends from the wire 70 through the

contacts

78, 81, 80 and 7 7, the wire 7 0 and the contacts 71, and 72 to the wire 73. As the motor rotates the switch 60 is moved to disengage the contact from the contact 77, thus breaking the relay circuit and causing the switch 66 to open. At or about the same time the contact 82 engages the contact 79 thus partly reestablishing the relay circuit in prepara tion for the next movement of the motor. After the switch 66 has been opened and after the motor has stopped it remains idle until the starting switch 65 is moved to again complete the relay circuit, the circuit this time extending through the Wire 70 instead of the wire 70* as before. When the circuit is thus completed the motor starts as before and continues operation until the contact 82 is disengaged from the contact 79. In this way the motor is started at intervals as the table reciprocates, the relz circuit being established alternately throug the

wires

70 and 70", and after each starting the limit switch 60 serves to stop the motor after rotation to a predetermined extent.

WVe prefer to have the feed motor rotate always in the same direction during normal feeding operation, but so far as certain features of our invention are concerned, such operation is not essential. There are, however, certain advantages incident to such operation, one of the more important. of which is the possibility of providmg a series field winding without complicated switch connections such as would be necessary if the motor were to be rotated alternately in opposite directions. A series field such as we have provided is desirable as it keeps down the starting current and provides a large starting torque.

Preferably, in order that the motor and the tool heads may not continue movement by momentum after the switch 66 is opened, we provide for short circuiting the motor armature to effect dynamic braking. At the lower end of the 'core of the magnet 67 there is provided a switch 83 which isopen when the motor is in normal operation but which is automatically closed when the switch 66 is opened. WVhen the switch 83 is closed a short circuit extends from the motor armature through the core of the magnet 67, the switch 83, the resistance 63 and back to the armature. It is to be observed that this short circuit includes only one part of the resistance which is normally in circuit with the armature. The part of the resistance which is in the form of the series field 64 is automatically excluded owhfle dynamic braking is taking place. If-this series field.

were left in it would oppose the shunt'field and lessen the braking action.

As already stated, it is desirable to in'order to effect traversing, that is, movement of the cross rail vertically or movement of one or more of the tool heads in the desired directions to effect preliminary ad justments. Normally, as stated, the feed motor is under the control of the starting switch'65 and the limit switch 60, which latter switch'servestointerrnpt the motor move- -ment. To effect traversing the limit switch 1 7 60 is prevented from acting, thus making it possible for the motor to be operatedconf tinuously. Whenthe feed motor-is so operated it is preferable to give'it a higher speed than it has Y'durin-g normal feeding.- The increase in can be obtained in any one of the several ways, but) we prefer tosecure the desired increase in speed by cutting out resistance from thearmature circuit, this resistance by preference bein the:

series field. Preferably there is provi ed a master device supplemental to the starting switch for controlling the motor during traversing, such a-master device being desirable'because it is inconvenient (although not impossible) to operate the starting switch 65 manually. The master device is preferably a pendent switch such as that already briefly mentioned and shown in Fig. 1 at 61.

The transfer switch 68 when moved from .its upper to its lower position enables the way the magnet 67 is continuously ene-rgized and the relay switch 66 is kept closed. At the same time the series field receives? -no current (except the energizing current" for the magnet 67 which is negli ible), and is therefore rendered substantia ly inefl'ective.

For the reasons already stat'ed',"it is desirable for the motor to operate always in the same direction during normal feeding operation, but when the motor is to be used for traversing it is desirable that it be reversible. this case the switch 61, is preferably so constructed and connected that the motor can not only be started and stopped but can 7 oper ate the feed device or-motor continuously Therefore the master device, in

also bemused. wajasamah ,61-

preferably, though not necessarily,.acts indirectly to control the motor, there. being provided a relay motor controlling mecha- "nism. Thls controlling mec hanism 1s adapt ed to cause the motor to operate in either direction. 7

So far as our invention-is oonoerned,. the one q shown a mechanism in many respects simi-' lar to that set'forth in Patent 1,003,269 to This mechanism com rises two op-' controlling mechanism" may-be of an of a number of sorts, but we prefer-an have Keefer. crating magnets 84 and 85 a apted res tively when their cores are lifted to c ose 89. Associated with said switches there are preferably blow-out magnets and 91, the magnet 91 preferably also cofiperating with the switches 66 and 83. The transfer switch 68, when in its lower position for traversing, connects the feed motor with this mechanism, and it will be seen that when the switch 86 is closed and the switch 88 opened, a circuit for the motor is completed as follows: from the positive lead 69" through the coil of the blow-out-magnet 90, the switch 4 i 89, the core of the magnet .85, the left-hand v pole of the switch 68,. the armature, the

switch 66, the central pole of the switch 68, a part .of the resistance 92, and the switch 86 back to the negative lead 74". is thus connected rection. p v

Rotation of the motor continues until the switch 86 is opened and the switch 88 closed. Then the motor circuit is broken and a short The motor circuit to effect dynamic braking is established as follows: from the armature through the left-hand pole of the switch '68, the core of the magnet 85, the switch 89, the left-hand blow-out magnet 90, the right-hand blowout magnet 91, the switch 88, the core of the magnet 84, a part of the resistance 92, the

central pole of the switch 68, the switch 66,

and back to the armature.

When the switch 87 is closed and the switch 89 0 ened' a circuit through the motor is esta lished in a manner similar to that already described except that the current flows through the armaturein the opposite direction and the rotation IS'I'QVBI'SBd.

When the switch 87 is again opened and the switch 89 again closed, a short circuit to effect dynamic braking-is established in the way already described.

for rotation in one di- The speed of rotation can controlled by varying the amount of a resistance92 in the circuit, but preferably the speed ;will be greater than that during feeding for the reason that the series field is rendered substantially ineffective as already stated. This in addition to increasing the speed, makes it possible for the motor to be easily reversed without complicated switch connections switches 86 and 87 and open switches 88 and rela circuits are provided which are control able by means of the master switch 61. The circuit for the magnet 84 extends from the positive lead 69 through wires 93 and 94, preferably through a normall. closed switch 95 at the lower end of the low-out magnet 91, and throughthe magnet coil to a contact 96 of the switch 61. The circuit for the ma net 85 extends through the wire 93, prefera bly through a normally closed switch 97 at the lower end of the blow-out magnet 90, and through the magnet coil to a contact 98 of the switch 61. The switch' 61 is also rovided with contacts 99 and 100 each of w ich is connected with the negative lead '71" by means of a wire 101. The

switch 61 has a movable contact 102 which can be moved upward from theposition shown in Fig. 3 andturned to the right or the left to connect either the

contacts

96 and 99 or the contacts 98 and 100. If 96 and 99 are connected the ma et 81 is energized and the motor rotated in one direction, and if 98 and 100 are connected the magnet 85 is energized and the motor rotated in the other direction. When the contact 102 is moved to central position, neither 'of the magnets is energized and the motor is short circuited fordynamic braking. The aforesaid switches 95 and 97 are connected to be opened by'the blow-out magnets 91 and 90 95 and 97, thus preventing the energization of either of the

magnets

84 or 85 to reverse the motor.

As was stated at the outset, we prefer a reversible electric motor for driving the planer table. When such a driving motor is used it is ossible, and in fact preferable, to control it by means of the same controlling mechanism which has been described as adapted for controllin the feed motor to effect traversing. In ig. 3 the driving motor is indicated by the reference character 6 as in the other figures. The motor is pro vided with a shunt field winding 103 and preferably with an interpole winding 101 and an extra series winding 105.

The transfer switch 68 is so connected that a circuit of the drive motor extends therethrough when the switch is in its upper feeding position, the said circuit being broken v en the switch is moved to -.its lower traversing position. When the switch 68 is in its u per position the drive motor can be starte in one direction by closing the switch 86 and opening the switch 88, the followingv circuit being established: from the positive lead 69" through the coil of the magnet 90,- the switch 89, the core of the tal controlling magnet 106 adapte to close a switch 107 and open a switch 108. Both contacts of the switch'108 are insulated from the core of the magnet 106. The operating circuit for this magnet is connected across the armature terminals of the motor in such a way that as the counter electromotive force of the motor increases the magnet is energized to close the switch 107 and. open the switch 108. The closing of theswitch 107 serves to short circuit the interpole winding 101 and the starting resistance 92, the circuit extending directly from the armature through the switch 107 to the switch 86. At starting the shunt field 103 is energized through a circuit including the wire 93, the switch 108 and a wire 109. The opening of the switch 108 breaks this circuit and places in series with the field more or less of a cutting resistance 110, the circuit extending through a switch '111 which is' normally closed. Thus by cutting out the interpole windin and the starting resistance and by wea ening the field the motor is brought to the correct speed for driving the table in the cutting direction, this speed being adjustable by varying the amount of the cutting resistance in circuit with the shunt field.

When the magnet 84 is deenergized to open the switch 86, and close the switch 88 a dynamic short circuit through the motor armature is established, this circuit being similar to that already described in connection with the operation of the feed motor. The short circuit current of the motor 6 be ing more powerful than that of the motor 18, energizes the magnets 90 and 91 sufficiently to open the switches 97 and 95, thus preventing the energization of the magnets 84: and 85 so long as aneafconsiderable short circuit current flows. hen the short circuit current drops'to a predetermined value the switches 95 and 97 are permitted to close, thus making it possible for one or the other of the

magnets

84 and 85 to be energized. When the magnet 85 is energized to close the switch 87 and open the switch 89 the operation is similar to that already described except that the motor is connected for rotation in the opposite direction. The magnet 85 also serves to open the switch 111 so that when the switch 108 is opened the shunt field circuit is established not only through the cutting resistance 110. but also through the motor armature is established in a return resistance 112. In this way a weaker field is provided and the motor given a much'higher speed for the return stroke, this speed being adjustable by varying the amount of the return resistance in the circuit. When the magnet 85 is de-- energized a dynamic short circuit throutglh e war already described.

he controlling mechanism,including'the magnets '8l4gand 85 can be operated in the manner already described by the master switch 61, and such 0 ration is frequently desirable durin pre iminary adpistments of the tools an of the work on the table. However, during normal operation of the planer it is' necessary to provide for the automaticoperation' of the controlling mech the table reciprocates.

and 98 of the master switch 61. Other conf tacts 99 and 100* are provided, these being connected together and corresponding respectively with the contacts 99 andlOO of the master switch 61. The pilot switch 8 has movable contacts 114 and'114 adapted respectively to connect the

contacts

96 and 99 and the contacts'98 and 100. the pilot switch is in one position one pair net and when the pilot switch'is moved at the end of the table reciprocation the first pair of contacts is disconnected and the.

other pair connected to stopthe motor and reverse itto drive the table in the opposite direction. There are also two

contacts

115 and 116 which are in the circuit of the mag net 106. These contacts are connected by one or the other of the contacts 114 and 114" so that the said magnet is energized whenever the motor is in normal operation. During braking, however; the said magnet is de-'- ener ized, thus including the interpole win ing 104 and the resistance 92 in the dy-' I namic short circuit of'the motor.

It, will be understood that in cases in which the master switch 61 is omitted the feed motor can be controlled and operated continuously in either direction for traversing by manually operating the pilot switch 8. For such 0 eration of the feed motor the transfer switc 68 will be in its lower position, thus rendering'thestarting switch 65 and the limit switch 60 inoperative and cutting out the main motor. r

eferably the master switch 61 is con- 'structed and connected with the pilot switch in a. manner similar that set forth inthe Keefer reissued Patents 14,539 and 14,540.

When the motor is in normal operation the "movable element of the master switch 61 is v in, its lower position as shown in Fi 3.

are connected, these contacts being in the circuit which connects the PillOflSWltCh conderin the pilot switch ino 'rative to control t e' said magnets. This prevents any accidental engagement of the dogs 11 and 12 with the levers 10 and 10" from. interferin with the control of the said" mag- I nets y means of the master switch, The

master switch 61 is preferably also provided with

contacts

119 and 120 which are also connected when the movable element is in 0 its lower position. Thesecontacts are in the circuitof the magnet 106 and when the movable element of the switch is moved upward to control the

magnets

84 and 85 the ma us the master switch 61can be used to operate the drive motor: in either direction only at a slow speed. It will also be v notedth'at the magnet 106 is inoperative to control the feed motor, and that therefore when the feed motor is under the control .of the controlling mechanism and the masterfswitch 61-the said motor is operated at the same speed in both directions. of contacts is connected to energize one mag- 60 to the control of the master switch 61.

and the controlling mechanism also serves to render the drive motor inoperative durraversmg.

a The switch has contacts 117' and 118w ich' v et 106 is rendered inoperative, thus ma nag it impossible for the motor to speed up; h

ingjt a y a nder some circumstances it is desirable to provide means whereby the beginning of .the operation of the feed motor depends upon the speed of the main motor; that is,

to provide meansiwherebythe feed motor is started when the speed of the main motor has dropped to a We prefer to make te construction such that the feed motor will start only when the main motor and the table have nearly redetermined point.

ceased movin-g, .As already stated, the controlling circuit for the feed motor includes contacts which are connected when the main ance withthe present feature of our invenpilot switch 8 is thrown over, and, in'accordtion, the controlling circuit for the feed motor also includes an electromagnetic switch which is held open till the speed of .the main motor drops to a predetermined .veniently be made of the switches 95 and is broken at 125 and the circuit of the'no" voltage coil is also broken at 126. The cir. cuit breaker is provided with a switch 127;

97 of the controlling mechanism. These switches are held open solong as anyconsiderable short circuit current flows 1n the drive motor circuit, this currentstopping simultaneously with the stopping of the mo tor and the table. The 0011 of the magnet 67 has been described as connected with the positive lead 69', and preferably the connection is through the sW1tches95 and 97 as shown. In this way the energization of the relay switch 66 for starting the feed motor is prevented until near the end of the table movement. I

In Fig. 3 we have diagrammaticall shown a circuit breaker. 121 provided wit overload and low voltage releasing coils, this circuit breaker being connected between the positive and negative leads 69 and 74 and the main supply leads 69 and 74. This circuit breaker constitutes no part of our present invention and a very brief description will be sufiicient. As shown, the

circuit breaker includes an overload release coil 122 and a no voltage coil 123. In the case of no voltage the circuit is broken at 124. In the case of high voltage the circuit and in the case of either no voltage or high voltage this switch is automatically moved to its closed position, as illustrated. This switch is open during the normal operation of the apparatus. When the switch is closed a short circuit is established through the armature of the motor 6 by means of the

wires

128 and 129, this circuit including all of the resistance 92. At the same time,

by means of the wire 129'and a supplemental wire 130, the shunt field 103 of the motor is short-circuited upon itself. This short-circuiting of the motor armature and of the shunt field serves to bring the motor quickly to rest in the case of high voltage or no voltage.

What we claim is:

1. In a planer or. other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a power device for feeding the tool, a starting device automatically operable by the table to efi'ect the intermittent feedinlg'of the tool by the power device as the table reciprocates or manually operable to effect the continuous movement of the tool by the power device for traversing, and means whereby the speed of movement of the tool is increased when' the power device is continuously operated for traversing.

2. In a planer or other machine having a reciprocating table and an adjustable tool,

. the motor under the control of the table armature," means or automatically starting the motor at intervals as the table reciprocates to effect feeding or for operating it a table operated starting switch for automaticallyoperating the motor intermittently as the table reciprocates to eflect feeding, means for operatlng the motor continuously to effect traversing, and means whereby the motor is caused to have greater torque when it is intermittently operated to effect feed ing than when it is continuously operated to effect traversing.

3. In a planer or other machine having a reci rocating table and an ad'ustable tool, t e combination with the ta 1e and the tool, of an electric motor for feeding the tool, a table operated starting switch for starting the motor at intervals as the table vreciprocates, a motor controlling mechanism supplemental to the table operated switch, and a transfer switch for'placing operated switch or for placing it under the control of the controlling mechanism and simultaneously increasing the motor speed. 4. In a planer or other machine havinga reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric motor for feeding the tool, resistance normall in series with the motor continuously to effect traversing, and means whereby the said resistance is rendered substantially ineffective :when the motor is operated continuously to efiect traversing.

5. In a laner or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a compound electric motor for feeding 105 the tool, means for automatically operating the motor intermittently as the table reciprocates to effect feeding or for operating 1t continuously to effect traversing, and means for rendering the series field substantially ineffective when the motor is operated continuously to effect traversing.

'6. In a planer or other machine havin a reciprocating table and an adjustable too the combination with the table and the tool, of an electric motor for feeding the tool, resistance normally in series with the motor armature, a table operated switch for automatically starting "the motor at intervals as the table reci rocates, a table 0 erated mechanism supp emental to the said controlling switch, and means whereby the said resistance is rendered substantially ineffective when the motor is under the control of the controlling mechanism.

7. In a planer or other machine havingb reciprocating table and an adjustable tool, the combination withthe table and the tool, of a compound electric motor for feeding the tool, a table operated switch for starting 184 lit of a tool feeding motor, a table operated' switch serving to start the motor always in the same direction at intervals as the table reciprocates, a controlling mechanism adapted to connect the motor for movement in either direction, and a transfer switch for placing the motor under the control either of the said starting switch or the said controlling mechanism and for increasing the speed of the motor when it is under the control of the said controlling mechanism.

9. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a power device for feeding the tool, a table operated starting device for effecting the feeding of the tool by the power device at intervals as the table reciprocates, and a master device supplemental to and operable independently of the" table operated device and adapted for controlling the said power device to effect movements of the tool independently of the table movements.

10. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a power device for feeding the tool, a table operated starting device for effecting the feeding of the tool by the power device at intervals as the table reciprocates, a master device supplemental to the table operated device and adapted for controlling the movement of the tool b the said power device, and means for ren ering the table operated device ineffective when the master device is in use.

11. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, and a supplemental controlling master switch operable independently of the table operated switch and adapted for starting stopping and reversing the motor.

12. In a a reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, a master switch supplemental to the table operated switch and adapted for starting stopping and reversing the motor, and means for rendering the table operated switch ineffective when the master switch is in use.

18. In a planer or other machine having a laner or other machine having reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, a supplemental master a switch operable independ ently of the table operated switch and adapted for starting stopping and reversing the motor, and a transfer switch for rendering the table operated switch ineffective and for causing the master switch to be effective to control the motor.

1a. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the .table reciprocates, a limit switch operated by the motor and normally serving to stop the said motor after rotation to a predetermined extent, a supplemental master switch operable independently of the table operated switch and adapted for starting stopping and reversing the motor, and means adapted to render the said limit switch ineffective whereby the motor is en tirely under the control of the master switch.

15. In a planeror other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, a limit switch operated by the motor and normally serving to stop the said motor after rotation" to a predetermined extent, a master switch supplemental to the table operated switch and adapted for starting stopping and reversing the motor, and a transfer switch for rendering the table operated switch ineffective and for causing the master switch to be effective to control the motor and for rendering the limit switch ineffective whereby the motor is entirely under the control of the master switch.

16. In a planer or other machine having a reciprocating table and an adjustable tool,

the combination with the table and the imol,

of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, a motor controlling mechanism supplemental to the table operated switch, and a master switch supplemental to the table operated switch and adapted for operating the controlling mechanism to cause the motor to rotate in either direction.

17. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool,

of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, a motorcontrolling mechanism supplemental to the table operated switch, a master switch supplemental to the table operated switch and adapted for operating the controlling mechanism to cause the motor to rotate in either direction, and means for rendering the table operated switch ineffective when the master switch is in use.

18. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the motor at intervals as the table reciprocates, a motor controlling mechanism supplemental to the table operated Switch, a master switch supplemental to the table operated switch and adapted for operating the controlling mechanism to cause the motor to rotate in either direction, and a switch for rendering the table operated switch ineffective and for causing the master switch to be eifective to control the motor.

10. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of an electric tool feeding motor, a table operated switch for starting the, motor at intervals as the. table reciprocates, a limit switch operated by the motor and normally serving to stop the said motor after rotation to a predetermined extent, a motor controlling mechanism supplemental to the table operated switch, a master switch supplemental to the table operated switch and adapted for operating the controlling mechanism to cause the motor to rotate in either direction, and means adapted to render the motor operated switch ineffective whereby the motor is entirely under the control of the master an it ch.

'30. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electrically controlled tool feeding devi tabl operated switch means for reversing the drive motor and for starting the feeding of the tool at intervals as the table reciprocates, and a master switch supplemental to thetable operated means for controlling the drive motor or for controlling the feeding of the tool in either direction by means of the said feeding device.

21. In a planer or other machine havin a reciprocating table and an adjustable tooI, the combination with the table and the tool, of a reversible electric table driving motor, an electrically controlled tool feeding device, table operated switch means for reversing the drive motor and for starting the feeding of the tool at intervals as the table reciprocates, a master switch supplementalto the said table operated means for controlling the drive motor or for controlling the movement of the tool in either direction by means of the said feeding device, and a transfer switch for placing either the drive motor or the feeding device each independently of the other under the control of the master switch.

2E2. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor at intervals as the table reciprocates, and a master switch supplemental to the table operated means for controlling the drive motor or for causing the feed motor to rotate in either direction.

23. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electric tool feeding motor, a unitary table operated switch adapted to reverse the drive motor and to start the feed motor at intervals as the table reciprocates, and a master switch supplemental to the table op erated switch for controlling the drive motor or for causing the feed motor to rotate in either direction.

24. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor at intervals as the table recipnocates, a master switch supplemental to the table operated means for starting stopping and reversing the feed motor, and means for rendering the drive motor inoperative when the feed motor is under the control of the supplemental switch.

25. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor,

an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor at interval as the table reciprocates, a master switch supplemental to the table operated means for controlling the drive motor or for controlling the feed motor, and a transfer switch for placing either motor each independently of the other under the control of the master switch.

26. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electric tool feeding motor, a table operated switch means for reversing the drive motor and for starting the feed motor at intervals as thetable reciprocates, means operated by the feed motor and normally serving to stop the said motor after rotation to a predetermined extent, a master switch supplemental to the table operated switch for controlling the drive motor or for start ing and stopping the feed motor, and a switch for rendering the motor operated switch ineffective w en the feed motor is under the controlof the master switch. 7 27. In a planer or other machine havin a reciprocating table and an adjustable too the combination with the table and the tool, of a reversible table driving motor, an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor at intervals as the table reciprocates, a limit switch operated by the feed motor and normally serving to stop the said motor after rotation to a predetermined extent, a master switch supplemental to the table operated means for controlling the drive motor or for starting and stopping the feed motor, and a transfer switch for placing either motor each independently of the other under the control of the master switch and for rendering the limit switch ineffective when the feed motor is under the control of the master switch.

28. In a the combination with the table and the tool, of a reversible-electric table driving motor, an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor always'in the same direction at intervals as the table reciprocates, a master switch supplemental to the table operated means for starting stopping and reversing the feed motor, and a transfer switch for rendering the drive motor inoperative when the feed motor is under the control of the master switch.

29. In a planer or other machine having a reciprocating table and an adjustable tool,

the combination with the table and the tool,

of a reversible electric table driving motor, an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor at intervals as the table reciprocates, a master switch supplemental to the table operated means for controllingthe feed motor, and means for rendering the table operated means ineffective to control the drive motorwhen the feed motor is under the control of the master switch.

30. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electric tool feeding motor, table operated switch means for reversing the drive motor and for starting the feed motor at intervals laner or other machine having 1a reciprocatlng table and an adjustable tool,

as the table reciprocates, a master switch supplemental to the table operated means either for controlling the drive motor or for controlling the feed motor, and means for rendering the table operated means ineffective to control the drive motor when the master switch is in use to control either motor. i

31. In a planer or other machine having a reciprocating table and an adjustable tool, the combination with the table and the tool, of a reversible electric table driving motor, an electric tool feeding motor, a motor controlling mechanism, table operated switch of a reversible electric table driving m'otor,

anelectric tool feeding motor, a motor controlling mechanism, table operated switch means for operating the controlling mechanism to reverse the drive motor at intervals as the table reciprocates and for startin the feed motor independently of the contro ling mechanism and always. in the same direction at intervals as the table reciprocates, a transfer switch for placing the feed motor under the control of the controlling mecha nism and for disconnecting the drive motor therefrom, and a master switch supplemental to the .table operated means and adapted for operating the controlling mechanism to start stop and reverse either motor.

33. In a planer or other machine having i a reciprocating table and an adjustable tool,

116 I the combination with the table and the tool, a

of a reversible electric table driving motor,

an electric tool feeding motor, a motor controlling mechanism, table operated switch means for operating the controlling mechanism to reverse the drive motor at lntervals as the table reciprocates and for starting the feed motor at intervals as the table reciprocates, a transfer switch for placingthe feedmotor under the control of the controlling mechanism and for disconnecting the drive motor therefrom, a master switch supplemental to the table operated means and adapted for operating the controlling mecha nism, and means for preventing the operation of the controlling mechanism by the table operated means when the master switch is in use.