* GB784753 (A)

Description: GB784753 (A) ? 1957-10-16

Improvements in or relating to slideway grinding machines

Description of GB784753 (A)

PATENT SPECIFICATION 784,753 Date of Application and filing Complete Specification: March 21, 1955. 1 No 8186/55. Application made in Switzerland on March 20, 1954. >, ' Complete Specification Published: Oct 16, 1957. Index at Acceptance:-Class 60, Dl D 4 A 1, D 2 A( 8: 20). International Classification:-B 24 b. COMPLETE SPECIFICATION Improvements in or relating to slideway grinding machines We, GESELLSCHAFT DER LUDW VON ROLL'SCHEN EISENWERKE A G, of Gerlafingen, Switzerland, a Company organized under the Swiss laws, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - The present invention relates to a slideway grinding machine, wherein the workpiece is secured to a carriage arranged for reciprocation under one or more grinding wheels mounted above said carriage, particularly one for grinding the slideways of the beds of lathes, planing machines, millers and grinders. To render work of this nature less expensive, grinding machines have already been designed in which two grinding heads are provided which are displaceable along guideways of the grinding machine so that at least two slideways can be machined simultaneously, irrespective of whether the sliding surfaces are flat or profiled The beds of the above-mentioned machine tools are as a rule provided with under-grip guides to secure the carriage moved along the slideways, which must be ground from underneath by means of dish grinding wheels. The purpose of the present invention is to enable this undergrinding to be carried out at the same time as the grinding of the top surface

of the slideways. According to the present invention there is provided a slideway grinding machine comprising a reciprocable carriage for carrying the workpiece and a cross-beam extending transversely of the direction of said reciprocation and on which at least one grinding member for top surface grinding is mounted, characterised in that the cross-beam has guideways for slides carrying grinding wheels, the first of which lPrice 3 s 6 d l guideways is arranged on one of the vertical surfaces of the cross-beam and the second guideway is arranged on the lower horizontal surface of the cross-beam. A typical embodiment of the invention is illustrated in the attached drawing in which: Fig 1 is a front view of part of a slideway grinding machine with a workpiece in position and two under-grinding attachments arranged on the additional guideways of the machine; Fig 2 is an elevation of an undergrinding attachment seen in conjunction with a part of the cross-beam of the machine; Fig 3 is a cross-section along the line Ill-III in Fig 2; Fig 4 is a plan view of the attachment according to Fig 2; Fig 5 is a cross-section along line V-V in Fig 2, the grinding spindle being axially adjustable in a vertical slide. Referring to the drawings, a workpiece 102 is secured to a carriage 101, which carriage is arranged for reciprocation upon a bed 103 The reciprocation of the carriage 101 carries the workpiece under a cross-beam 1 extending transversely of the direction of reciprocation of the carriage 101, and the cross-beam 1 is adapted to have adjustably mounted thereon one or more grinding heads or attachments. On the underneath side of the cross-beam 1 of the grinding machine, on the front of which guideways 2 are provided for the main slide carrying grinding wheels 11, lla, there is a recess 3 with additional guideways 4 and 5 (Fig 3) The slide 6 is mounted in the guideways 4, 5 so that it can be displaced horizontally, and it is provided with a threaded nut 7 through which the screw 8 passes The slide 6 is provided with clamping bolts 12 and 13 which are hydraulically controlled by means of the handwheel 10 The slide 6 can be displaced horizontally by means of the screw 8 mounted in the guideway 5, independently of the main slide mounted in the guideways 2 In the slide 6 there is arranged a vertical dovetail guide 6 a on which the vertical slide 14 is mounted. Bolted to the slide 6 by means of bolts a is a flange 15 (Figs 2 and 3) to which an internally threaded tube 16 is rigidly welded at right angles The threaded spindle 17, which is mounted on ball bearings 18 and 19 in the housing 14 a, engages in this internally threaded tube On its lower end the spindle 17 has a handwheel 20, by means of which the spindle 17 can be rotated and the slide 14 roughly adjusted

Between the two ball bearings 18 and 19 a worm gear 21 is keyed on to the spindle 17 This gear is engaged by the fine adjusting worm 22 which is mounted on the shaft 22 a and on which is arranged the handwheel 23, by means of which the slide 14 can be vertically adjusted during the fine infeed The shaft 22 a, on which the fine adjusting worm 22 is arranged, is eccentrically mounted in a rotatable bush 22 b which can be turned by means of the lever 22 c so that the worm 22 can be disengaged from the worm gear 21 for coarse adjustment of the slide 14 The vertical slide 14 has an arm 25 in which is mounted the bearing bush 26 of the grinding spindle 27 Arranged on the grinding spindle 27 is the belt pulley 28 which engages in the recess 3 of the cross-beam 1, which recess is open underneath Also mounted on the said spindle is a grinding wheel 29, of the disk type for instance. Secured to arms 30 on the other side of the slide 14 is the motor 31, the belt pulley 32 of which also engages in the recess 3 of the cross-beam 1 and drives the belt pulley 28 of the grinding spindle 27 via the belt 33. The grinding wheel 29 can therefore be adjusted both horizontally and vertically by means of the threaded spindle 8 and the threaded spindle 17 in the slide 14. For the vertical adjustment of the grinding wheel 29, the latter may be mounted in a threaded bush so that, by turning the threaded bush or the threaded nut, the said wheel may be vertically adjusted without displacing the slide 14 Fig 5 shows this adjusting device The grinding spindle 27 is, as shown in Fig 5, mounted in an axially shiftable bush 35 in the vertical slide The said bush 35 is provided with a thread 36 and held in a threaded nut 37 so that it is axially displaceable The bush 35 also has a toothed rim 38 which is engaged by the worm 39 mounted on the shaft 40 Fine adjustment of the grinding wheel can be effected by turning the shaft 40 with the nut 37 locked, and coarse adjustment by turning the nut 37. The vertical feed as well as the horizontal displacement of the grinding spindle can also be automatically effected at the end of each carriage travel by known means which are not described in detail, such as motors and reducing gear for instance.

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* GB784754 (A)

Description: GB784754 (A) ? 1957-10-16

Improvements in or relating to infinitely variable gearing

Description of GB784754 (A)

I, ROBERT JAMES ROSTRON, of 187 Ashton Drive, Bristol 3, a British Subject, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by' which it is to be performed, to be particularly described in and by the following statement: - This invention relates to infinitely variable gearing and in particular to gearing wherein the change of gear ratio takes place automatically in proportion to the torque in or the speed of the output shaft. One of the objects of the present invention is to provide an infinitely variable gear box having an automatic change of ratio with change of torque in the output shaft, wherein there are no slipping or rubbing parts and no servo-mechanisms. According to the present invention I provide a gear box comprising an input shaft and an output shaft, a first epicyclic gear one element of which is coupled to said input shaft, a second epicyclic gear one element of which is coupled to said output shaft and two separate trains of gears of differing ratios coupled between the other elements of said two epicyclic gears Said epicyclic gears may comprise a pair of differential gears arranged in parallel relation, and the cages of said gears may be coupled to the input shaft and output shaft respectively The difference in gear ratio between the two different trains of gears may be less than ten per cent of the total ratio of each train The total gear ratio of each train may be greater than 100: 1. Referring now to the drawing filed herewith which shows a diagrammatic plan view of one form of gear box made in accordance with the present invention In the form shown an input shaft 1 carries a bevel gear 2 driving a bevel gear 3 mounted on the cage 4 of a differential gear 5

Said shaft 1 and said differential gear 5 are mounted in bearings in the casing 6 of the gear box. Two lay shafts 7 and 8 are provided, one end of each of which is mounted in bushes 9 and 10 respectively in the casing 6 and the other end of each of which is secured in the bevel gears 11 and 12 respectively of the differential gear 5 and mounted in bearings in the cage 4 A second differential gear 13 is mounted in bearings in the casing 6 by its cage 14, and a second pair of lay shafts 15 and 16 respectively extend therefrom and run parallel to the shafts 7 and 8 and are mounted in like manner to the shafts 7 and 8 in bushes 17 and 18 in the casing Two pinions 19 and 20 keyed to the shafts 7 and & mesh with the gears 21 and 22 of the double gears 23 and 24 mounted free to rotate on the shafts 15 and 16 respectively. The pinions 25 and 26 of the double gears 23 and 24 mesh with the gears 27 and 28 of the double gears 29 and 30 mounted free to rotate on the shafts 7 and 8 respectively. The pinions 31 and 32 of the double gears 29 and 30 mesh with gears 33 and 34 keyed to the shafts 15 and 16 A bevel gear 35 is mounted on the cage 14 of the second differential 13 and meshes with a second bevel gear 36 mounted on the output shaft 37 The drive from the input shaft is therefore in effect divided at the first differential gear for transmission through two trains of gears, one train numbered by odd numbers and mounted on the shafts 7 and 15 having a reduction gear ratio of 100: 1, and the other train numbered by even numbers and mounted on the shafts 8 and 16 having a reduction gear ratio of 105: 1 The two trains will hereinafter be referred to as "the lower ratio drive" and "the higher ratio drive" respectively The second differential gear combines the two drives and feeds the output shaft 37. In use the input shaft of the gear box is coupled to a prime mover and the output 784,754 PATENT SPECIFICATION Date of filing Complete Specification: March 16, 1956. Application Date: March 22, 1955 No 8355/55. Complete Specification Published: Oct 16, 1957. Index at Acceptance:-Class 80 ( 2), D 2 D 2. International Clausification:-FO 6 h. COMPLETE SPECIFICATION. Improvements in or relating to Infinitely Variable gearing. 65. shaft to the machine required to be driven. If the engine used as a prime mover is idling and the input shaft is being driven in a clockwise direction of rotation (looking a from the input end) the cage 4 will rotate clockwise (looking in the direction of the arrow X) All directions of rotation to be measured hereafter

will be in the two directions of viewing the gear box mentioned above This clockwise rotation of the cage 4 will tend to drive the shafts 7 and 8 also in a clockwise sense Assuming that there will be a greater resistance to drive the higher ratio gear train via the shaft 8 than the lower ratio gear train via the shaft 7 the tendency will be for the latter train to rotate in preference to the former Therefore the lower ratio gear train will tend to be turned clockwise while the higher ratio gear train will tend to remain stationary The shaft 7 driving through the lower ratio gear train will consequently rotate the shaft 15 anticlockwise If the shaft 8 is stationary then the shaft 16 coupled to it must also remain stationary and the cage 14 will tend to rotate anti-clockwise thus driving the bevel 36 and the output shaft 37 anti-clockwise. As soon as the resistance at the output shaft 37 is increased the shaft 8 will begin :3 u to turn slowly in the opposite direction to that of the shaft 7 i e anti-clockwise, thus turning the shaft 16 in the clockwise sense. This will reduce the speed of the shaft 7, (assuming input remains constant) and thus 3,5 the speed of the cage 14 As the resistance at the output shaft increases towards a predetermined value the speed of the shaft 16 will approach the speed of the shaft 15 in an opposite sense with the resultant slowing up of the cage 14 and a reduction of the gear ratio When the speed of the shaft 16 is equal to that of the shaft 15 the cage 14 will have no tendency to turn at all and the output shaft will stall Under these conditions there is a point of no drive being transmitted Between this point of no drive and the point of direct drive through the lower ratio gear train there are an infinite number of gear ratios automatically selected by the resistance at the output shaft Since the ratios between the two separate trains of reduction gears are different there will be no tendency for the input shaft to stall as well as the output shaft as the shafts 7 and 8 will never turn at the same speed in opposite directions. The point of no drive is determined by the ratios of the two separate gear trains and by the difference of ratio between them. One of the advantages of a gear box constructed according to the example described above is that an infinitely variable gear box can be built with standard parts and there are no rubbing surfaces, fans or slipping belts nor are there any servo mechanisms. Moreover the gear box automatically selects a position of no drive as soon as the torque at the output shaft reaches a predetermined value thus preventing overstraining the engine.

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* GB784755 (A)

Description: GB784755 (A) ? 1957-10-16

Improvements in or relating to pressure operated switches

Description of GB784755 (A)

We, TEDDINGTON AIRCRAFT CONTROLS LIMITED, a British Company, of Cefn Coed, Near Merthyr Tydfil, South Wales, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to pressure-operated switches of the kind in which a switch mechanism is actuated by changes in the pressure differential across a spring-loaded diaphragm. One use for switches of this character is in systems for controlling flow of air or gas through a conduit where the pressure in the threat of a venturi mounted in the conduit and the pressure at a point in the conduit upstream of the venturi are transmitted respectively to opposite sides of the diaphragm, the switch mechanism operated by the diaphragm controlling the energisation of adjusting means for a flap valve or like element regulating quantitive flow of air or gas through the conduit This method of control is commonly used, for example, in aircraft cabin pressurisation systems. The object of the present invention is to provide novel or improved means for varying the degree of spring loading on the diaphragm such that the energisation of the adjusting means for the flap valve or like element for a given change of pressure differential across the diaphragm may be varied according to operational needs. According to the invention a pressureoperated switch of the kind

referred to above comprises a coiled spring loading the diaphragm in one direction, thrust means engaging one end of said spring, a reversible electric motor driving through reduction gearing a rotary cam device, and lever lPrice 3 s 64 2 7849755 mechanism actuated by said cam device and operable to impart movement to said thrust means to vary the degree of compression of said spring. An embodiment of the invention will now be described with reference to the accompanying drawings of which:Fig 1 is a partly sectional elevation of the complete instrument, and Fig 2 is a section on the line II-II of Fig 1. In the illustrated embodiment of the invention the diaphragm, variable spring loading means and switch mechanism are associated to form a single instrument, for which purpose there is provided a base plate 1 and a cover 2 having sealing engagement therewith to form a closed chamber. Attached to the outer side of the base plate 1 is a pair of recessed discs 3 and 4 between which the peripheral edge of the diaphragm is clamped, the inner disc 4 being formed with a tubular extension 6 which passes through an aperture in the base plate and into the closed chamber The central portion of the diaphragm is clamped between outer and inner support plates 7 and 8 The two operating pressures are transmitted respectively to the recess or space on the outer side of the diaphragm and to said closed chamber. Mounted within the tubular extension 6 with a close sliding fit is a hollow plunger 9 which at one end is attached to the diaphragm support plate 8, a coiled compression spring 10 being interposed between the other end of said plunger and a piston-like cap element 11 slidably but non-rotatably mounted within the right hand end portion of the tubular extension 6 Both the extension 6 and the plunger 9 are formed with diametrically opposed window-like openings PATENT SPECIFICATION Inventor: -ANTHONY BASIL CARTER. Date of filing Complete Specification: March 26, 1956. Application Date: March 25, 1955 No 8839155. Comnplete Specification Published: Oct 16, 1957. Index at Acceptance:-Class 38 ( 5), B 2 A 130 C: B 4: C 602). International Classification:-H Oln. COMPLETE SPECIFICATION. Improvements in or relating to Pressure Operated Switches. 784,755 through which project portions of the switch mechanism now to be described with particular reference to Fig 2. The switch mechanism in this particular embodiment comprises an on-off switch unit 12 (shown made) and a change-over switch unit 13 Axial movement of a rod 14 to the left opposes the natural springiness of the spring blades and causes switch unit 12 to ( open and switch unit

13 to change over This axial movement is imparted by a screw 15 set in the right hand end of the plunger 9. Located adjacent the outer end face of the cap member 11 is a thrust ring 16 with a ball race 17 interposed between the cap and said ring, and extending axially through the ring is a stud 18 provided with an enlarged flat head 19 on its outer end, said stud preferably having screw-threaded connection with the ring to facilitate initial setting or adjustment. Mounted alongside the tubular extension 6 is a reversible electric motor which through built-in reduction gearing (not shown) drives a rotary eccentric cam 20 supported externally of the motor housing 21 Pivotally mounted at one end on the motor housing 21 is a lever arm 22 which at its other end carries a roller 23 engaging the head 19 of 3 o the stud 18 in the thrust ring 16, whilst intermediate its ends the lever arm 22 supports a second roller 24 which rides upon the periphery of the cam 20, the arrangement being such that rotation of the cam 20 in 3.5 either direction by appropriate actuation of the motor rocks the lever arm 22 and effects axial displacement of the thrust ring 16 to increase or decrease the degree of compression of the diaphragm loading spring 10. 4 o) Thus it will be seen that the invention provides a simple method of remote control adjustment of the spring loading of the diaphragm and in the application of the invention to mass flow control of the air supply in cabin pressurisation systems as above mentioned, it enables the rate of flow of air to be readily adjusted by either manually or automatically controlling the energisation of the electric motor during the cam 20.

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* GB784756 (A)

Description: GB784756 (A) ? 1957-10-16

A method and means for applying protective coverings to metal pipes

Description of GB784756 (A)

COMPLETE SPECIFICATION. A Method and Means for Applying Protective Coverings to Metal Pipes. We, WELLINGTON TUBE WORKS LIMITED, of Great Bridge, Tipton, in the County of Stafford, a British Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a method and means of applying to gas and water service or other pipes, a protective covering of the kind consisting of bitumen or the like and a reinforcement consisting of hessian, glass fibres, slag wool or other fibrous material. According to the invention a succession of pipes interconnected by rapterable couplings are fed as a continuous tube through a means for applying the covering thereto, and after emerging from the said means a lateral force is exerted on the leading pipe for rupturing the coupling between this and the next pipe and severing the part of the covering which encloses this coupling. In the accompanying drawings: Figure 1 is a plan illustrating diagrammatically an apparatus for carrying the invention into effect. Figure 2 is a sectional view illustrating the means for interconnecting a pair of pipe ends during the covering operation. Figure 3 is a sectional view illustrating the condition of a pipe end after detachment of the coupling means. Referring to the drawings, the reinforcement material of the covering consists of a continuous band a of any convenient width made from hessian, felted or woven glass fibres, or slag wool, or any other fibrous material, and this is fed through a bath b of bitumen or the like of such consistency as will provide a relatively thick protective coating on the reinforcement material. The protective coating may, however, be applied in other ways. Thus it may be applied directly to the pipes, in which case the reinforcing material is applied in a dry condition. The pipes c to be coated are usually screw threaded at their ends, and to each of these ends is attached a coupling member d in the form of a short sleeve which is engaged with the screw thread and which also extends along a short length of the pipe beyond the screw thread so as

to prevent that length from being coated. In the outer end of one of the coupling members in each co-operating pair is formed a central hole e of polygonal or other non-circular shape, and on the adjacent end of the other member is formed a short complementary spigot f which is tapered along a part of its length to form a lead-in which can enter the said hole. The two members of each coupling are such that whilst they can transmit rotary motion from one pipe to the next, they can easily be disconnected from each other by lateral deflection of one of the pipes relatively to the other. To enable the couplings to be easily detached from the pipe ends and to obviate adhesion of the covering material to the couplings, each coupling member has applied to it a paper sleeve g which is inwardly flanged at one end, so that the flanges of an associated pair of sleeves can be gripped between the coupling members. Alternatively the couplings may be coated with a material such as, for example, an oil-bound distemper to which the covering does not adhere. For feeding the pipes longitudinally through the position at which the covering material is to be helically coiled thereon, there are provided at the approach side of the said position a pair of power-driven cross-rolls 12 having their axes mutually inclined so that they can impart both rotational and longitudinal motion to the pipes. Also pipe-supporting or guide rolls i are provided for feeding the pipes to the crossrolls, the guide rolls being adapted to feed the pipes forward at a faster rate than the cross-rolls. When the apparatus is in action the first length of pipe is fed forward to the position at which the covering material is applied. At or adjacent to this position excess material (in one example) is removed or is smoothed by a scraper or other means indicated by k and a coating of whitewash, sand or a paper covering In is applied to prevent adhesion of the coated pipes when bundled together. Where paper is used the pipe is sluiced with water by a sprayer o to cool and harden the coating. When the rear end of the first pipe approaches the cross-rolls the next pipe is placed on the guide rolls as indicated at the right hand part of Figure 1, and this pipe is rapidly fed forward so that its forward end overtakes the rear end of the first pipe and effects interconnection of the coupling parts. When the coupling passes through the covering position it also is enclosed by the covering material. In like manner other pipes are successively fed into the apparatus, so that a virtually continuous pipe consisting of interconnected individual pipes passes through the covering position, and has deposited on it a continuous covering. For separating the covered pipes, these are fed on to supporting

rollers p and so lateral force is exerted on the leading pipe so as to deflect it relatively to the following pipe. This force is applied to the forward end of the leading pipe and may be exerted by a roller q. The effect of this deflection is to separate the members of the coupling between the leading pipe and the next pipe and at the same time break the part of the covering enclosing this coupling. The separated pipes successively fall away to a collecting position. Subsequently the coupling parts are detached and cleaned if necessary, and are again used on other pipes. The parts of the covering material which enclosed the couplings may be left in position as shown in Figure 3, as they then serve to protect the screw-threaded ends of the pipes during storage or transport. When it is required to put the pipes into use the said parts can easily be severed at the position indicated by the line marked r in Figure 3, and then detached By this invention the application of a protective covering to pipes can be effected in a very expeditious, cleanly, and economical manner. What we claim is: 1. A method of applying to pipes a protective covering of the kind specified, in which a succession of pipes interconnected by rupturable couplings are fed as a continuous tube through a means for applying the covering thereto, and in which after emerging from the said means a lateral force is exerted on the leading pipe for rupturing the coupling between this and the next pipe and severing the part of the covering which encloses this coupling. 2. An apparatus for effecting the method claimed in Claim 1, which includes means for applying the covering material to the pipes, feed rolls adapted to impart rotary and axial movements to the pipes, supporting rolls adapted to impart axial movements to the pipes for interengaging the coupling members on the adjacent ends of successive pipe ends, other supporting rolls at the discharge side of the pipe covering means, and means adapted to exert a lateral force on the leading pipe for rupturing the coupiings and covering. 3. Pipe coupling means for use in the method and apparatus respectively specified in Claims 1 and 2, comprising a pair of interengageable members of the spigot and socket type for connection to a pair of pipe ends, the said members being adapted to enclose the pipe ends and being mutually disconnectable by relative lateral movement. 4. A method and apparatus for applying a protective covering to a succession of pipes, substantially as described and as illustrated by the accompanying drawings. PROVISIONAL SPECIFICATION. A Method and Means for Applying Protective Coverings to

Metal Pipes. We, WELLINGTON TUBE WORKS LIMITED, of Great Bridge, Tipton, in the County of Stafford, a British Company, do hereby de clare this invention to be described in the following statement: This invention relates to a method and means of applying to gas and water services or other pipes, a protective covering consisting of bitumen or the like and a reinforcement consisting of hessian, glass fibres, slag wool or other fibrous material. According to the invention a succession of

* GB784757 (A)

Description: GB784757 (A) ? 1957-10-16

Improvements in circular knitting machines for the production of seamlessknitted footwear

Description of GB784757 (A)

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The EPO does not accept any responsibility for the accuracy of data and information originating from other authorities than the EPO; in particular, the EPO does not guarantee that they are complete, up-to-date or fit for specific purposes.

PATENT SPECIFICATION Inventor: -BERT SMITH. Date of filing Complete Specification: April 17, 1956.

Application Date: May 27, 1955 No 153211/5. Complete Specification Piblihsihed: Oct 16, 1957. Index at Acceptance:-Ciass 74 ( 2), C 1 A 5. International Classifioation:-D 04 b. COMPLETE SPECIFICATION. Improvements in Circular Knitting Machines for the Production of Seamless Knitted Footwear. We, G STIBBE & Co LIMITED, a British Company, of Maxim Buildings, Great Central Street, Leicester, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement - This invention relates to circular knitting machines for the production of seamless hose, three-quarter hose, half hose and like articles of knitted footwear, and has reference particularly to such machines of the single rotary needle cylinder type equipped with outside sinkers. In a seamless hose machine of this type, the needle cylinder has secured thereto a radially tricked external ring constituting a bed for the outside sinkers and there is fitted upon this ring a stationary annular cap serving to carry the cams for operating the sinkers in appropriate timed relation with 'respect to the needles The periphery of the external sinker ring is in the nature of a journal which is rotatable within the sinker cam cap, and the latter is accordingly located by the said ring. Heretofore, in a machine of the type concerned the periphery of the sinker ring was solely relied upon to maintain the stationary sinker cam cap concentric with respect to the axis of the machine But whilst this necessary concentricity of the cap, and hence also the accuracy in the positioning of the sinker-operating cams was satisfactorily maintained when the machine was new, in due course wear between the ring and the cap caused the latter to become eccentric. As a consequence, the sinker-operating cams were displaced and inaccurate timing of the lPrice 3 s 6 d 1 sinkers resulted Such wear was in large measiure caused by foreign matter from needles, sinkers and other parts passing between the ring and the cap. The object of the present invention is to provide, in a circular knitting machine of the type referred to, means of a simple and efficient character for steadying the sinker cam cap and positively maintaining it concentric with respect to the axis of the machine. According to this invention, steadying elements carried by a stationary support and suitably spaced apart about the machine are set to engage the periphery of the sinker cam cap and thereby maintain the latter concentric with respect to the sinker ring and the needle

cylinder to which said ring is secured. The said stationary support may conveniently consist of a ring disposed in a horizontal plane beneath the sinker cam cap, and the steadying elements may take the form of blocks which are fixed upon the ring and have slightly concave inner surfaces arranged in contact with the exterior peripheral surface of the cap The support ring may be attached to any convenient parts on the machine. Any appropriate number of such steadying blocks may be provided; three, however, is a convenient number since these can be readily spaced at equal distances apart around the sinker cam cap suchwise as to provide a three-point steadying arrangement In order that the invention may be more clearly understood and readily carried into practical effect, a specific constructional example thereof will now be described with reference to the accompanying drawings, wherein: 784,757 Figure 1 is a vertical sectional view of so much of the head of a knitting machine of the single rotary needle cylinder type as is necessary to illustrate the external sinker a ring, the sinker cap and the stationary support ring for the steadying blocks; Figure 2 is a general perspective view of the steadying blocks mounted upon the support ring and showing also the parts to which this ring is attached; Figure 3 is a detail sectional view depicting the manner in which a steadying block is arranged to engage the periphery of the sinker cam cap; and Figure 4 is a fragmentary elevational view illustrating one of the clips used for holding down the sinker cam cap. Like parts are designated by similar reference characters thoughout the drawings. In Figure 1, the single rotary needle cylinder of the seamless hose machine is indicated at 1, and the relatively stationary cam box 2 is mounted upon a bed plate 3 in the usual way At 4 is represented the conventional latch ring above which is mounted the inturned welt dial WD The needle cylinder 1 has secured thereto a radially tricked or grooved external sinker ring 5, and there is fitted upon the latter a stationary sinker cam cap 6 The sinker ring 5 rotates within and locates the sinker cam cap 6 One of the latch needles operating in the cylinder 1 is indicated at N, whilst at S is shown one of the outside sinkers mounted in the ring 5. For steadying the cam cap 6 and maintaining it concentric with respect to the axis a of the machine, there are provided, in the illustrated example, three steadying blocks 7 which are equally spaced apart around the said cap and are mounted upon and fixed to a horizontal support ring 8 As will be seen in Figure 1 this support ring, which is of flat section, surrounds a lower reduced portion Sa of the external sinker ring 5 and is attached, by means of screws 9, to a plate 10 in

turn carried by a main feeder column 11, at one side of the machine, and by means of screws 12 (Figure 2) to a plate or like part such as 13 carried by an inturned welt dial drive column 14 at the opposite side of the machine. The inner face of each of the steadying blocks 7 is undercut at 7 a suchwise as to accommodate and yet avoid contact with the peripheral portion Sb of the rotary sinker ring 5 and to provide an operative surface 7 b arranged in contact with the exterior peripheral surface 6 a of the stationary 68 sinker cam cap 6 The operative inner surfaces 7 b of the blocks 7 are slightly concave, the concavity of these surfaces corresponding with the circumference of the outer vertical surface 6 a of the cap 6. d 5 The blocks 7 may advantageously be made readily adjustable upon the support ring 8 to enable them to be adjusted and accurately set in position in contact with the periphery of the cap 6 In this regard the said blocks may, as shown more clearly 70 in Figure 3, be secured to the ring 8 by means of screws 15 which extend through radial slots 16 in the ring and are screwed into tapped holes formed in the undersides of the blocks 75 For the purpose of holding down the sinker cam cap 6 there are provided clips or the like, such as that indicated at 17 in Figure 4, which are attached to the said cap and are adapted for engagement with So the underside either of the support ring 8 or, as shown, of the lower portion 5 a of the sinker ring The vertically disposed portion 17 a of the clip depicted in Figure 4 is received in a vertical slot 18 cut in a lug 85 6 b formed on the periphery of the sinker cam cap 6 and is forked or slotted for engagement with a securing screw 19. If necessary or desirable, the support ring 8 may be made in two parts, e g halves, to g O facilitate assembly. Thus, as will be appreciated, the capsteadying arrangement provided by the invention tends to reduce wear between the sinker ring 5 and the cap 6, but, in any 95 case, the amount of such wear is no longer of any consequence since the sinker cam cap is positively prevented from becoming eccentrically disposed In fact, maintenance of the concentricity of the cap ensures lou accurate timing of the sinkers notwithstanding wear The invention is particularly advantageous in fine gauge machines.

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