US1721671A - Cutting-off machine - Google Patents

Description

July 23, 1929. M. J. SCHLITTERS. JR

CUTTING-OFF MACHINE 4 Sheets-Sheet Filed May 15 1927 July 23, 1929.

M. J. SCHLITTERS. JR

CUTTING-OFF MACHINE Filed May 15, 1927 4 Sheets-Sheet fin .P Lu

m n e 0 M d I/ 0, a atznup July 23, 1929. M. J. SCHLITTERS, JR

' CUTTING-OFF MACHINE Filed May 13, 1927 4-SheetsSheet Jhwnto'a Jf/yvel/ in g 7/ July 23, 1929. M. J. SCHLITTERS. JR

CUTTING-OFF MACHINE Filed May 13, 1927 4 Sheets-Sheet wv ww Patented July 23, 1929.

UNITED STATES PATIENT OFFICE.

MICHAEL J. SCHLITTERS, JR, or DETROIT, MiCHIGAN, AssIe'NOa To magma SCREW PRODUCTS COMPANY, OF DETROIT, MICHIGAN, A CORPORATION 01* HIGH!- GAN.

c'UTTInaorr MAOIIINE.

Application filed Kay 13,

ple spindle type wherein a plurality of pieces of stock are simultaneously treated in the machine. There are provided inner and outer holders for supporting tools engaging the stock at diametrically opposite points so that the stock will be cut or otherwise formed halfway by each tool. The spindles are geared to rotate on their own axes while the tool holders are moved inwardly of the stock. The inner tool holders are moved by wedges which advance the inner tools into the stock, and the outer tool holders are preferably cam oper ated. The two cams are preferably related to each other so that one set of cutters, inner or outer, will have completed its work before the other set engages the material.

The invention is fully disclosed in the following description and in the accompanying drawings, in which- Figure 1 is a side elevation of the machine;

Fig. 2 is a plan view thereof;

Fig. 3 is a section on the line 3-3 of Figure 2;

Fig. 4 is a section on the line 44 of Figure 3;

Fig. 5 is an end view;

Fig. 6 is a longitudinal vertical section of the spindle assembly; and

Fig. 7 is a section on the line 77 of F igure 2.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

The frame of the machine may be indicated in general by the numeral 1, and particular parts thereof will be specifically indicated as required. The frame includes end walls 2 and 3 in Which is journaled the main drive shaft 4 carrying a pulley 5 which may be belted to a suitable source of power. A sleeve 6 surrounds the shaft and is spacedtherefrom as shown in- Figure 3. The sleeve 1927. Serial No. 191,036.

has its ends fixed in the ends 2 and 3 of the frame and therefore does not interfere with the movement of the shaft. The sleeve functions as the carrier of a slide member 7 which is substantially square in cross section.

The machine isof the multiple spindle type wherein there are provided a plurality of spindles each supporting a piece of stock. One of these spindle assemblies is shown in detail in Figure 6 and the four spindles comprised in the present machine are arranged at the corners of a square having its diagonals intersecting in theaxis of the shaft be seen by reference to Figure 3.

The end wall 3 is a double member comprising elements 3 and 3 formed with pairs of aligned bearings 8 and 9 at the points where the spindles are to spindle includes an outer tube 10 slidablybe supported. Each 4 as may mounted in a pair of bearings and provided 7 with an externally threaded end 11 disposed inwardly of the wall element 3". On this threaded end is screwed a hollow seat member. .12 tapered internally as at 13 for accommodating a-chuck or collet. The other end of the tube 10 has a flange 14, the purpose of which will presently be described. I

The tube 10 contains a slidablecollet tube 15 formed at its inner end with a chuck 16 adapted to fit in the seat member 12. The

chuck is split at 17 as shown in dotted lines in Figure 6, in order to permit clamping upon. the piece of stock 18 surrounded thereby. The outer end of the collet tube has a flange 19 adapted to be moved into engagement with the collar 14. Within the collet tube 15 and surrounding the stock 18 is provided a slidable pusher tube 20 having at its inner end a series of spring fingers 21 adapted to press upon the work. The outer end of this tube has a collar 22.

Inwardly of its collar 14, the spindle tube 10 is loosely surrounded by a block 23 having a cam surface 24. A head 25 loosely surrounds the tube members bet-ween' the block 23 and the collar 22 and has pivoted thereto apair of 'fi'ngers- 26 which have their free ends in engagement with the cam face 24.- These fingers are provided near their pivot points with angular lugs 27 adapted to engage the flange 19.

A frame 28 ispositioned in the plane of the several heads 23 and is formed with yokes 29 received in grooves 30 formed in theseheads.

Similarly another frame 31 is provided in a plane inwardly of the collars 22 and has corner formations 32 adapted to engage these collars at the inner surface thereof. A similar pusher device 33 is provided at the end of these assemblies and has sections 34 adapted to engage the outer surface of the collars 22.

The frames 28, 31 and 33 are controlled by suitable cam mechanism to effect the following operations.

When a piece of work has beenfinished in the machine, the frame 21 is retracted outwardly to engage the collars 22 and to move the pusher tubes 20 in'the same direction. The stock is still clamped in the chuck, and since the gripping action of the latter member is greater than that of the spring fingers 21,

9' stock through the chuck. Finally, the frame 28 is moved outwardly so that the cam face 24 swingsthe fingers 26 and brings the lugs 27 against the flange 19 to clamp the chuck again on the stock.

On the top and bottom of the slide 7 are provided constructions for determining the length of stock moved through the chucks by the pusher tubes and for moving the'cutting tools against the stock. Since these assemblies are identical on both horizontal surfaces of the slide, it will be necessary to describe only one of them in detail. Each horizontal surface of the slide has fixed thereto a track member 35 of substantially T-shape in cross section and held by screws 36 as shown more clearly in Figure 7. On the trackis mounted a stop carrier 37 having in its base a groove 38 for relative sliding movement between these parts and which suitably accommodates the track. A fixed position of the carrier is secured by a rod 39 (Figure 2) having one end fixed in the end wall 2 of the frame and its other end passed through the carrier and fitted with clamping nuts 40 engaging opposite sides of the carrier. The ends of the carrier support studs 41 which act as stops for the work projected inwardly of the machine by the action of the pusher tubes as already described, and the adjustment of the stop carrier on its track determines the length of stock which may thus be fed into the machine on each operation of the cam mechanism controlling the spindle assemblies.

In advance of the track 36, a wedge shaped spreader 42 is secured to each horizontal surface of the slide 7 by means of screws 43. The incllned faces of the member 42 converge in a horizontal plane and towards the double wall 3. These faces are dovetailed as at 44 (Figure 3) to engage in slidable relation tool holders 45 having each a tennon 46 received in one of the clove-tail grooves. Thus the two spreaders 42 engage four holders 45 corresponding with the four pieces of stock supported by the four spindle assemblies.

The tool holders 45 are slotted at 47 to receive tools 48 held by screws 49. In order to maintain the tool holders at a fixed distance from the stockcarrier 37, rods 50 have one end anchored in the carrier by clamp nuts 51 threaded thereon and the other end formed with a square head 52 (Figure 1) slipped into a T-slot 53 cut in the holder. The cutters 48 are directed towards the stock, and it will be apparent that movement of the slide 7 by the means presently to be described, will cause the tool holders to be separated by the wedge 42 and the cutters to be driven into the work.

The wall 2 of the frame has a pair of bearings 54 extending outwardly therefrom as shown in Figure 2 for the purpose of accommodating a worm 55 arranged horizontally and at right angles to the main drive shaft 4 as shown in Figures 2 and 5. The main shaft carries a bevel 56 meshing with a similar bevel 57 at the adjacent end of the worm whereby the latter receives its movement. Between the bearings 54, the wall 2 is formed with still another bearing 58 which supports a stub shaft 59 carrying a worm gear 60 in mesh with the worm 55. A cam shaft 61 is journaled in the frame beneath the shaft 59 and carries a pinion 62 meshing with a similar pinion 63 on the shaft 59. The shaft 61 supports a cam consisting of a drum 64 having part of its surface blank as at 65 and the remainder 66 of increased radius and formed with a cam groove 67. The slide 7 is provided at one end with a head 68 having an ear 69 carrying a roller 7 0 received in the cam groove 67. A neck 71 extends upwardly from the head and has a'slot 72 which receives a guide block 73 depending from the top piece 74 of the frame. The movement of the cam through the gearing connecting it to the drive shaft moves the block 7 whereby the wedge 42 separates the two holders for the purpose already mentioned.

. The frame is formed with transverse tracks 75 lying in substantially the same vertical plane as the tool holders 45. On these tracks are mounted slidable bases 76 which carry holders for tools engaging the pieces of stock at points opposite the inner tools 48. The holders are in the nature of uprights 77 and 78 each lying alongside two vertically aligned pieces of stock. At the lower end of each upright is a foot 79 penetrated by bolts 80 which have lower heads 81 slipped into undercut slots 82 formed in the corresponding slid-e. The uprights are forked at both ends as at 83 and 84 for receiving the outer cutters 85 which are clamped in place by screws 86.

The outer holders 77 and 78 are drawn inwardly of the work in order to cut substantially halfway through thesame, while the remainder of the operation is performed by the inner cutters. In order to effect such operation there is provided a lateral bearing 87 supported by the frame and accommodating a stub shaft 88 which is driven by its bevel gear 89 meshing with a similar gear 90 on the cam shaft 61 as shown more clearly in Figure 3. The stub shaft 88 carries a double cam consisting of a drum 91 having a pair of similar but oppositely directed cam grooves 92 and 93. The base 7 6 of the holder 77 has a lug 94 (Figures 1 and 2) to which is attached a transverse rod 95 with a depending block 96 lying over the groove 92 and having one of its faces substantially tangential to the cam drum. In this block is mounted a spindle 97 carrying a roller 98 riding in the groove 92. Adjacent the cam drum, the frame is formed with a guide member 99 (Figure 2) having an aperture of square cross section for receiving a square portion 100 of the rod 95, thereby guiding this elongated member and preventing turning movement thereof. The holder 7 8 has a stem 101 carrying a spindle 102 on which is mounted a roller 103 riding in the groove 93. Due to the opposite directions of the cam grooves at all points, the holder 77 will be moved oppositely to the holder 78, so that both these members will simultaneously be drawn towards the work or away from it.

The main shaft 4 carries a gear 104 disposed exteriorly of the wall section 3*. This gear meshes with pinions 105 carried by the various spindle assemblies so that the latter are rotated against the cutters.

In Figure 2 the cam drums 64 and 91 are so related that the outer tool holders will be moved towards the work while the roller controlling the slide 7 and inner holders 45 rides on the blank part of the drum 64. When the cams have turned substantially 180, the outer holders will have been pushed into the work and withdrawn therefrom and the roller 70 will have just entered the cam groove 67 to commence the cutting action of the inner tools 48. Thus, the work will be cut halfway by one set of tools and the operation subsequently completed by the other set so that both sets of tools will not meet. Obviously, the sequence in which both sets of cutters act upon the work may be timed by adjusting the cam drums.

The tools 48 and 85 have been assumed to be devices which simply cut the work. They may however be of such shape to shape the stock adjacent the cleavage or to simply form the stock without severing it. It will also be apparent that more than four spindle assemblies may be provided and that the outer and inner tools may be mounted to operate thereon in the manner herein described in connection with four spindles.

Although a specific-embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

\Vhat I claim is 1. In a machine of the character described, a frame, a work holder supported by said frame, a main drive shaft, tool holders supported by the frame at opposite sides of said work holder, and means geared to said shaft for moving said tool holders towards work supported by the work holder.

2. In a machine of the character described, a frame, work holders supported by said frame, inner and outer tool holders supported by the frame at opposite sides of each work holder, wedges mounted between and slidably connected to said inner tool holders, means for sliding said wedges, and means for drawing said outer tool holders inwardly.

3. In a machine of the character described, a frame, work holders supported thereby, inner tool holders slidably mounted on the frame, double tool holders slidably mounted on the frame and adapted each to carry two outer tools, and means for sliding said tool holders towards work supported by the work holders.

4. In a machine of the character described, a frame, work holders supported thereby, inner tool holders slidably mounted on the frame, double tool holders slidably mounted on the frame and adapted each to carry two outer tools, wedges mounted between and slidably connected to said inner tool holders, means for sliding said wedges, and means for sliding said outer tool holders towards work supported by said work holders.

5. In a machine of the character described, a frame, a work holder supported thereby, a carrier fixed to said frame, a spacing rod extending from said carrier towards said work holder, atool holder slidably mounted on said rod for movement transversely thereof, means for sliding said tool holder, and a sto member supported by said carrier in axia alignment with said Work holder.

6. In a machine of the character described, a frame, a work holder supported thereby, a carrier fixed to said frame, a spacing rod extending from said carrier towards said work holder, a tool holder slidably mounted on said rod for movement transversely thereof, a slide supported by said frame, an inclined member carried by said slide and engaging said tool holder, and means for actuating said slide.

7 In a machine of the character described, a frame, a work holder supported thereby, a carrier fixed to said frame, a spacing rod excarrier fixed to said frame, a spacing rod extending from said carrier towards said work holder, a tool holder slidably mounted on said rod for movement transversely thereof, a slide supported by said frame, an inclined member carried by said slide and engaging said tool holder, and a cam connected to said slide for ac-tuatlng the same.

In testlmony whereof I aflix my signature.

MICHAEL J. SCHLITTERS, JR.

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