US2871766A - Milling machine for cylindrical stereotype platens or the like - Google Patents

Description

Feb. 3, 1959 A. o. OLSSON EIAL MILLING MACHINE FOR CYLINDRICAL 2,871,766 STEREOTYPE PLATENS OR THE LIKE 3 Sheets-Sheet 1 Filed March 9', 1956 Feb. 3, 1959 A. O. OLSSON ET AL MILLING MACHINE FOR CYLINDRICAL STEREOTYPE PL'ATENS OR THE LIKE Filed March 9, '1956 3 Sheets-Sheet 2 A. o. oLssou ET AL MILLING MACHINE FOR CYLINDRICAL STEREOTYPE PLATENS QR THELIKE Feb. 3, 1959 s Sheets-Sheet 3 Filed March 9, 1956 Patented Feb. 3, 1959 United States Patent Ofi MILLING MACHINE FOR CYLINDRICAL STEREO- TYPE PLATENS OR THE LIKE Axel Olof Olsson and Johan Julius Dahl, Stockholm, Sweden, assignors to J. Dahl & Son AB, Stockholm, Sweden, a corporation of Sweden Application March 9, 1956, Serial No. 570,443 Claims priority, application Sweden March 15, 1955 2 Claims. (CI. 90-20) known, wherein the stereotype platen is arranged on a cylinder which is rotatably mounted on ashaft. The whole cylinder with its mounting is displaceable in the axial direction on a slide outside the cylinder, and is rotated by means of a gear pinion meshing with a gear wheel at one end of the cylinder. By reason of the fact that the means of the cylinder for its rotation and longitudinal displacement are arranged outside the cylinder, these means are easily subjected to impurities and worked-01f millings, whereby the exact mounting of the cylinder may be jeopardized. Particularly, where it is desired to cut a number of platens at the same time, as is the case, for instance, in a printery with a number of presses operating in parallel multi-colour printing, the mounting of a corresponding long cylinder cannot be constructed with the accuracy required in such a case.

In the milling machine according to the invention, said drawbacks are avoided by the fact that the mounting and driving means for the rotation and axial. movement of the cylinder are enclosed within the latter.

The invention will be described hereinbelow in connection with the accompanying, partly diagrammatic drawing of an eight-spindle milling machine. Fig. 1 shows a vertical section through the machine viewed in elevation, Fig. 2 shows the machine viewed from the side, and Fig. 3 shows the same viewed from above. Fig. 4 shows a mounting means for the cylinder, Fig. 5 shows the mechanism for effecting the rotary movement of the cylinder, and Fig. 6 shows the mechanism for eifecting the axial movement of the cylinder.

The milling machine is erected on a base plate 1 with side walls 2, 2, which are united by means of a rear Wall 3. In a pair of floor- stands 4, 4 arranged on both sides outside the side walls 2 on the base plate 1, a substantially cylindrical supporting shaft 5 is stationarily and nonrotatably arranged with cut-down plane surfaces 6 bearing on corresponding planes of the floor-stands 4. A keep 7, '7 at each end maintains the supporting shaft 5 pressed against the floor-stand plane. The supporting shaft 5 extends along the front side of the machine and carries a relatively thin walled hollow cylinder 8 concentrically mounted on the supporting shaft. Arranged on the surface of the cylinder 8 are rigid steps 9, against which cylindrically curved stereotype platens 10 are adapted to hear. The machine shown in the drawing is intended for the milling of up to eight platens at the same time, which are placed, four of them in a row along the cylinder 8 and four others diametrically opposite the first-mentioned platens. For each platen 10 there is provided a milling spindle 11 displaceable radially toward the cylinder 8, four spindles being mounted on a beam 12 adapted to be raised and lowered and located above the cylinder 8,

and four spindles being arranged on a beam 13 adapted to be raised and lowered and located below the cylinder. The spindles 11 are driven in pairs by means of belt transmissions 14 from electric motors 15 secured in the rear wall 3, the milling machine described being equipped with two motors in the upper part and with two motors in the lower part thereof. The radial setting of the milling spindles 11 is eifected by means of a treadle arranged along the front side of the machine and acting at the same time over a lever system on the upper and the lower rows of spindles 11. The treadle 16, which is operated from the front side of the machine and which is preferably lockable in a depressed position, is at each end thereof rigidly connected to a lever 16, which is swingably arranged in bearing brackets 16" at both ends of the rear wall 3. The two milling spindle beams 12 and 13 are guided in a vertical direction in guide ways 17, 17 on each side of the frame, and are operated by means of levers 18, 19, which are swingably arranged on both sides in the upper and the lower parts, respectively, of the side walls 2 of the frame. The two lower singlearmed levers 19 are swingably arranged at the side wall 2 at a fulcrum 20 in the fore ends thereof, and are ,at a point 21 between the ends thereof provided with a lifting roller 22 in engagement with'the lower spindle beam 13. The two upper double-armed levers 18 are swingably arranged at the side Walls 2 of the frame at a fulcrum 23 between the ends thereof, and are at the fore lever end provided with a' lifting roller 24 in engagement with the upper spindle beam 12. The rear ends of the levers 18, 19 are on both sides pivotally connected by means of a link rod 25, and at a fulcrum 26' inside the fulcrum 26 of the lever 19 with the link rod 25 there is on each side arranged a shorter link rod 27, the other end of which is at a fulcrum 27' pivotally connected with the treadle 16. Here, the leverage is chosen so that the upper beam 12 will have imparted to the same a movement which is approximately twice as great as that of the lower beam 13. Thus, if the upper beam 12 has a movement of displacement of 16 mm., the lower beam 13 has a displacement of 8 mm. Hereby balancing of the beams is obtained when the treadle 16 is operated. A compression spring 27 is also arranged: for this purpose and is clamped on the long link rod 25 between an abutment 28 on the latter and a bracket 29 arranged on the rear wall 3, the rod 25 extending through said bracket.

The milling spindles 11 are only displaceable in a radial direction toward the cylinder, whereby only the depth of the cut portion canbe determined by the adjustment of the spindles in the vertical direction. In order that the milling spindles shall be capable of working off larger portions of the stereotype platens 10, the cylinder 8 carrying these platens is adapted to perform both a rotating and an axial feeding movement on the rigid supporting shaft 5. To this end, the cylinder 8 is at each end mounted'radially by means of a radial ball bearing 30 on a bearing holder 31 with a central hole, which has a diameter somewhat'greater than that of the supporting shaft 5. The inner ball race 32 of the radial bearing 30 is secured to the bearing holder 31, whereas the outer ball race 33 is fitted against the inner surface of the cylinder 8. Furthermore, three ball bearings 34 are supported oneccentrically adjustable pins 34' (Fig. 4) on pair of projections 31' on the bearing holder 31 the centralaxes of the ball bearings 34 being located in a plane at right angles to the cylinder axis. These ball bearings 34 run with the outside of the outer ball race on a planed surface on the supporting shaft 5 in the longitudinal direction of the latter. The two bearing holders 31 are connected mutually by means of three braces 35, 36, 37 extending within the cylinder 8, one of them, 35, extending along the upper side of the supshaft and provided with a hole having the upper brace T extending therethrough.

The two feeding movements of the cylinder are effected by means of two hand wheels 39, located on the front side of the machine within convenient reach of the machine attendant. The axial movement of the cylinder 8, that is to say, its longitudinal displacement on the supporting shaft 5, is effected by means of the hand wheel 39 visible on the right in Fig. 3. For the purpose in view, a guide screw 41 is arranged within the cylinder 8 in parallel to the supporting shaft 5, said guide screw being rotatably mounted in ball bearings 42, 43 inserted into blocks 44, 45 on the supporting shaft 5. The length of the guide screw 41 exceeds in a certain measure the length of a stereotype platen 10, counted in the longitudinal direction of the cylinder 8. Arranged on said guide screw 41 is a nut 46 supporting between a pair of flanges a carrier 47 made in the form of a round disk, said carrier floatingly surrounding the supporting shaft 5 while being secured by means of conical pins 47 to the three braces 35-37 extending through apertures in the carrier 47. The nut 46 is mounted in the carrier 47 with a radial play, while the axial play between the nut and the carrier is reduced to the least possible value. The guide screw 41 is connected at one end thereof with a driving shaft 48, which is extended out through the right hand side wall 2 of the machine and through the right hand bearing stand 4, where the end of the shaft is mounted in a bracket 49 and provided with a spur gear wheel 50. This gear wheel 50 is in engagement with another spur gear wheel 51 arranged on the end of a shaft 52 extending along the front side of the machine to the right hand wheel 39. The shaft 52 is mounted at both end-s thereof, and is in the proximity of the hand wheel 39 provided with a bevel gear wheel 53 in mesh with another bevel gear wheel 54 on the shaft 55 of the hand wheel 39.

The rotary movement of the cylinder is effected by means of a spur gear pinion 36 rotatably mounted within the cylinder 8, the length, mounting and the drive of said pinion being otherwise arranged in the same manner as for the guide screw 41. The spur pinion 56 is in engagement with an internally toothed rim 57 secured on the inside of the cylinder 8. The left hand wheel40 is connected to the long spur pinion 56 over a bevel gearing 58, a longitudinally extending outer shaft 59, a spur gearing 60 and a shaft 61 extending inwardly through the head of the cylinder 8. The cylinder 8 is also provided at each end thereof with a packing plate 62, which by means of inserted packing rings 62' prevents impurities from penetrating into the cylinder.

The milling machine according to the invention thus makes it possible to cut as many as eight stereotype platens 10 at the same time, radial feeding being provided by operation of the treadle 16, while feeding in the longitudinal direction is performed by means of the right hand wheel 39, the whole cylinder 8 being then moved in the longitudinaldirection, and feeding in a peripheral direction being effected by means of the left hand wheel 40, the cylinder 8 being then turned about its central axis. By causing the cutter to follow the outlines of a platen portion to be milled off, the corresponding portions of the remaining platens will be milled off automatically, on the condition that the platens 10 are placed exactly on the cylinder 8. By the construction of the mounting of the cylinder 8, as above described, this mounting can be made with such precision that it will be possible simultaneously to cut a plurality of platens with an accuracy of :005 mm. On account of the fact that the mounting and driving means of the cylinder 8 are located within the latter, they are also protected against millings and impurities that would otherwise prevent the exact functioning of the machine.

The milling machine according to the invention is not limited to the embodiment above described, but may be varied in its construction and details, without the inventive concept being departed from. Thus the machine is not limited to eight milling spindles, every reasonable number from one spindle and upwards being conceivable. Also, the driving means of the cylinder may be constructed otherwise, for instance by means of hydraulic or electric motors arranged within the cylinder, with control valves and switches, respectively, arranged outside the cylinder. Instead of the hand wheels described, electric motors may also be made use of.

What we claim is:

1. A milling machine for the milling of cylindrical stereotype platens or the like, said machine consisting of a frame, a supporting shaft rigidly mounted in said frame, a hollow cylinder mounted movably in the axial direction on said supporting shaft and rotatably about its central axis, said cylinder serving for carrying said stereotype platens, a mechanism enclosed within said cylinder to effect the rotary feeding movement of the cylinder, 21 further mechanism enclosed within said cylinder to effect the axial feeding movement of the cylinder, cutting means in the frame, said cutting means being displaceable substantially in a radial direction toward each platen, a hearing holder at each end of the cylinder, at least three rotatably mounted rollers in each bearing holder running with the outside of the outer ball race on a planed surface on said shaft, the rotary central axes of which are located in a plane at right angles to the central axis of the cylinder, said rollers running on a planed surface of the supporting shaft in the longitudinal direction of the latter, and in each bearing holder a radial bearing, on which bearings the cylinder is mounted for a rotary movement. I

2. A milling machine as claimed in claim 1, wherein the two bearing holders are connected by means of braces extending within the cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 376,134 Birge et al Jan. 10, 1888 506,620 Bemis Oct. 10, 1893 840,765 Goss Jan. 8, 1907 1,146,175 Kutscheid et al July 13, 1915 2,214,450 Boehle Sept. 10, 1940 2,253,702 Hall Aug. 26, 1941 2,280,481 Cushman Apr. 21, 1942 2,322,129 Hawkins June 15, 1943

Images