Patent GB-546251-A (GB)
Title: Improvements in or relating to control apparatus for boring and facing or other machines
IPC: B23Q5/32
Filed: 1941-02-13
Abstract: 546,251. Actuating and driving machines; lathes. ASQUITH, Ltd., W., and JOHNSON, A. Feb. 13, 1941, No. 1953. [Class 83 (iii)] A control apparatus for boring and facing or other machines containing a number of movable elements such as a boring spindle, facing-head, table slide &c. actuated individually or otherwise for performing different operations, comprises a single rotatable control which is rotated to impart fractional rotations to a dial concentric with the rotatable control, such fractional rotations causing mechanism connected with the dial to engage and disengage the required motions, the said motions being indicated on the dial. The machine includes a work table 7, Fig. 1, having longitudinal and transverse motions, a reversible rotary and axially movable boring-spindle 1, and facing slide 5 movable across a face-plate 6 concentric with the spindle, the spindle-head being movable on a column 3. The main control dial A, Fig. 2, moves over a larger dial A<SP>1</SP> which may be rotated through one or more revolutions by a handle A<SP>2</SP> having a spring locating plunger Ax coacting with a recess in the housing B. A complete rotation of the dial A<SP>1</SP> acts through a gear train a<SP>2</SP>, a<SP>12</SP>, a<SP>10</SP>, a<SP>7</SP>, Fig. 3, to impart a fractional rotation to a spindle a<SP>4</SP> carrying the dial A and also connected to members formed with cam tracks F, G, H, K. The main dial A, Fig. 2, is divided by radial lines a<SP>13</SP> and arcuate lines a<SP>14</SP>. The outermost ring of sectors is marked with operation markings such as " milling", " snout-boring ", " facing " &c. and the sector a<SP>18</SP> has an inner sector a<SP>22</SP> marked " screw cutting ". Certain operations may be marked in distinctive colours. Four of the sectors have index marks a<SP>23</SP>, a<SP>24</SP> marked " forward" " and " backward " respectively, these marks aligning with lines a<SP>37</SP> on the outer dial coacting with a pointer D connected to the reversing mechanism. The next inner ring of sectors, which may be coloured red, motions obtained from push button switches. The hand wheel 8 which can be connected to some or all of the motions is located adjacent the main dial A. The cam grooves F ... K control the various movements. Thus the groove F operates a lever f<SP>1</SP>, Fig. 5, connected to a splined clutch member f<SP>5</SP> mounted on the shaft d<SP>5</SP> and connectible to a wheel f<SP>4</SP> driven from the wheel 8. The groove G similarly operates a splined gear g<SP>6</SP> mounted on shaft d5 and connectible to a gear g<SP>7</SP> on a shaft g<SP>8</SP> driving a gear box g<SP>9</SP>, Fig. 1, operating the up and down movement of carriage 2 and movements of table 7. The groove H controls a clutch member h<SP>5</SP> splined on shaft indicate the parts used for performing the various operations together with the connections of hand and power motions. Thus sector a<SP>25</SP> adjacent sector a<SP>15</SP> marked " boring " may be marked " Hand to Spindle ", " Power to Spindle and sector a<SP>27</SP> opposite " milling " sector a<SP>17</SP> may be marked "Hand to Table or Slide ", " Power to Table or Slide". The next inner ring of sectors coloured green may be marked with letters, numbers, or symbols to indicate the speeds available for the particular operation. Thus the sector a<SP>30</SP> adjacent sector a<SP>25</SP> may be marked with the letters XYZ, the words " speeds available " being marked on the inner ring a<SP>35</SP>. The central part of the dial may contain information regarding the hand motions. The hand-level D may be marked " feed reverse lever" and is connected to a rod d<SP>2</SP>, Fig. 5, controlling the clutch-member d<SP>4</SP>, of reversing bevel gearing d<SP>6</SP> ... d<SP>8</SP>, controlling the direction of motion of a shaft d<SP>5</SP> operating the spindle 1, slide 5, raising and lowering of carriage 2, and movements of table 7 Hand lever E has three positions giving respectively quick power traverse, power feed, or hand movement tc the dial-selected motion the movement selected being indicated on a table e, Fig 2, viewed through a window e<SP>1</SP> of the lever. Alternatively the lever D may be brought to a neutral posi tion between the marks a<SP>37</SP> for hand feeds and the quick power traverse f<SP>5</SP> and connectible through gears h8, h<SP>10</SP> and differential gearing 5b to a shaft 5c operating the slide 5. Another fork h<SP>11</SP> operated by groove H controls a sliding gear h<SP>12</SP>, h<SP>13</SP> coacting with gears h<SP>14</SP>, h<SP>15</SP> driving the screw h<SP>16</SP> for axial spindle movement. Cam groove K actuates a fork k<SP>4</SP>, operating a splined wheel k<SP>6</SP> on the shaft 10, the wheel k<SP>6</SP> being engageable selectively with a loose sleeve member N or a gear k<SP>7</SP> driven from the motor shaft 9a and loosely mounted on a spindle 11. Engagement with the member N gives feed in terms of inches per revolution and engagement with gear k<SP>7</SP> gives feed in terms of inches per minute. Used in conjunction with the dial A is a dial I, Fig. 2, which, like the dial A, is rotated through fractions of a revolution by complete rotations of an outer dial I<SP>1</SP> by handle I<SP>2</SP> and the sections i ... i<SP>4</SP> are viewed through a window I<SP>4</SP>. The compartments are marked " spindle ", " facing head " &c. and have a symbol indicating the speed range. The part I<SP>3</SP> is marked " speed range selector ". The dial I is also connected to four cam grooves operating levers j, kx, l, m, Fig. 4. Of these the lever j acts through links j<SP>1</SP> ... j<SP>7</SP> on a fork which slides a splined pinion 6a, Fig. 5, into internal engagement with a gear 6b on the faceplate. Cam lever kx operates through linkage a sliding double gear kx<SP>6</SP>, kx<SP>7</SP> mounted on a shaft 13 driven from the gear box g<SP>9</SP> and adapted to engage selectively a wheel 6c on the face-plate barrel or a wheel driving pinion 6a thus giving two speed ranges for the face-plate. Lever I acts through a lever l<SP>1</SP> on a sliding member l<SP>3</SP> having internal and external teeth, the latter being always in engagement with the loose sleeve N and the internal teeth being engageable with a member Ib keyed to the spindle. The wheel I<SP>3</SP> can thus connect the face-plate and spindle and also enables the feed gearing to be driven through the barrel N for feed in terms of inches per face-plate revolution. The speed range letters ZYXW on dial I are checked against actual speed numbers on a dial P, Fig. 2, similar in construction to dial I and having nine subdivided compartments p' ... p<SP>9</SP>, the letters being marked on the right and left of the aperture P<SP>4</SP> and corresponding members read off on the dial. This dial is connected to a cam, operating followers Q, R. The follower Q operates through lever mechanism a fork q<SP>2</SP>, Fig. 5, operating a sliding multiple q<SP>4</SP> controlling the speeds of a shaft 14 and the follower R similarly operates a sliding multiple gear r<SP>4</SP> thus imparting a multi-speed drive to shaft 13. Another subsidiary dial T, Fig. 2, is used in conjunction with the main dial A and is divided into concentric areas t ... t<SP>3</SP> arranged in nine radial zones. Each compartment in zone t<SP>3</SP> bears a letter read in conjunction with a chart containing screw cutting information. The words " Milling ", " Boring ", " Facing' and Screw-cutting " may be marked opposite the respective areas t ... t<SP>3</SP> on the left of the opening T4 in a plate T<SP>3</SP> and letters C, F signifying coarse and fine feeds are marked on the right of the opening. The dial T is rigidly connected to a cam operating a lever v, Fig. 4, actuating a sliding gear v<SP>2</SP>, Fig. 5, coacting with gears v<SP>3</SP> on shaft 11. In operation, if boring is to be performed the sector a<SP>13</SP> is brought into position. The words " hand to spindle" and " power to spindle " on sector a<SP>25</SP> indicate that the operation is to be performed by the spindle and letters XY and Z on sector a<SP>30</SP> indicate the speed ranges available. The dial I is then turned to bring compartment l<SP>2</SP> marked " spindle " into the opening I<SP>4</SP> thereby operating the gearing to couple the spindle to. the driving mechanism and the dial P also operated until the required speed number appears in the aperture P<SP>4</SP>, thus indicating that the spindle will be rotated at the required speed. Coarse or fine feeds are obtained by moving a lever X which operates the sliding gear, these feeds being respectively indicated by letters C, F on the plate T3.