US1437398A - Rewinding device - Google Patents

Description

J. A. CAMERON AND G. B. BIRCH.

REWINDING DEVICE.

APPLICATION FILED 020.9, I916.

Pabtentfl Dec. 5, 1922 3 SHEETS-SHEET I.

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REWINDING @EWCE.

APPLICATION FILED M09. l9l6.

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REWINDING DEVICE.

APPLICATION men 050.9. 1915.

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I UNITED STATES 1,437,398 PATENT OFFICE.

JAME A. CAMERON AND GUSTAE BIRGER BIRCH, OF BROOKl'JYN, NEW YORK, ASSIGNORS TO CAMERON MACHINE COMPANY, OF BROOKLYN, NEW YORK,

A CORPORATION OF NEW YORK.

REWINDING DEVICE.

Application filed December 9, 1916. Serial No. 135,946.

To all whom it may concern:

. Be it known that we, JAMES A. CAMERON and GUs'rAr B. BIRCH, citizens of the United States, and residents of the {borough of in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Rewinding Devices, of which the following is a specification.

This invention relates to rewind shafts for use in connection with slitting and rewindin machines, and. is particularly adapte for use in connection with machines of the center rewind type.

In the art of slitting and rewinding sheet material it is frequently found that, because of imperfections in the methods of manufacture, the material to be operated upon is not uniformly thick throughout its area. This results in a tendency on the part of the rewound coils supplied by the thicker material to increase in diameter faster than the coils supplied by the thinner portion of the web with a consequent uneven distribution of tension on the different strips caused by the difierent peripheral speeds of coils of different size. This uneven distribution of tension on the different strips causes un equal pulls at the point of severance Which in turn distorts the strips out of the plane of severance thereby preventing even slitting when score cutters act ng against a hardened cutter roll are used. In consequence the slitting is uneven and when the slitted sections are rewound into adjacent coils on the same shaft, interweaving will take place. In the cases where the machines employed are of the surface rewind type, such as that shown in Patent No. 1,076,189 in which a plurality of driven rollers engage opposite portions of the peripheries of the rewound 0011s under pressure, this tendency on the part of the 00119 to assume different diameters is overcome by the pressure of the rollers. However, in the smaller center rewind type of machine in which the rewound coils are peripherally engaged only by the rewlnding roll, or rolls, which engage only one slde of the coils, and the rewound coils are consequently not built up with as great a degree of uniformity as 1s the case in the surface rewind machines, difficulty has been experienced when handling certain materials in causing the coils to rotate at the same peripheral speed to thereby exert a uniform tenslon on all the strips at the slitting point.

In the center rewind type of slitting and rewinding machine the rewind shaft is driven independently of the peripheral engagement of the rewound coils with the rewinding roll and through a mechanical connection with a driven part of the machine. The result is that all the rewound coils are driven from the same shaft at the same angular speed, so that, when the material is of greater thickness adjacent the edges than in the center, the greater circumferences of the end coils on the shaft must necessarily travel at a greater surface speed than the coils near the center of the shaft and consequently exert a greater tension on the correspondlng outer strips. On the other hand, the tension exerted on the inner or central strips, because of the lower surface speed of the smaller inner coils supplied by the thinner central portion of the web, is so much less than the tension on the outer strips, that the central coils are relatively loosely wound. This condition has the eifect of interfering with building up the central rolls to the dimensions required,

.because of the tendency of separated rolls to collapse, and of the edges of contiguous rolls to interweave with each other.

The imperfections in the material do not always, however, manifest themselves in the same way, that is, the thin portion of the material is not invariably coincident with the central section of the web but is frequently located adjacent one or both edges of the web or between the edges and the center. In any case the general result is the same, and the rewound coils supplied by the thinner portions of the web and having consequent smaller diameters than the remaining coils, are loosely and imperfectly wound.

The main object of this invention is to provide means in a slitting and rewinding machine of the center rewind type for equalizing the pull on the different strips regardless of variations in diameter among the coils.

The invention consists principally in a slitting and rewinding machine of the center rewind typein which the rewind shaft permits the several coils to rotate at different angular speeds but at substantially another form of machine embodying the invention.

Figure 4 is a vertical sectional, view at right angles to the view shown in Figure v3, with parts broken away, taken substantially along the line 44 of Figure 3.

Figure 5 is a view partly in plan and partly in horizontal section showing the sectional rewind shaft.

Figure 6 is an enlarged detail view, showing the means for driving one of the sleeves on the rewind shaft.

Figure 7 is an enlarged sectional detail view looking along the line 77 of Figure 2.

Figure 8 is a detail View looking in from the right of Fig. 4 and showing the slip drive connection and adjacent parts.

In the particular embodiments of the invention chosen for illustration there are shown slitting and rewinding machines which are generally of the center rewind type, in which the rewind shaft is mechanically connected through a slip drive connection with a moving part of the machine.

In one machine including an embodiment of the invention there is shown atypical form-of center rewind machine in which a single, combined backing and cutter roll engages the periphery of the rewound coils and directly delivers the severed strips of material to the coils. The cutter roll is provided with a hardened surface against which score cutters roll to slit the web as in the construction shown in Patent No. 1,076,189, already referred to. In the other form of the invention a machine is shown which.- includes the 'independently driven rewind shaft of the typical center rewind machine and also partakes of the nature of the surface rewind type of machine in that two rewinding rolls are employed on which the rewound coils are supported. In both embodiments of the invention the rewound coils are held pressed into engagement with the rewinding roll, or rolls, by pressure exerted through the rewind shaft. Because of the inadequacy of the pressure thus exerted to equalize the diameters of all the rewound coils a rewind shaft having sections adapted to rotate at different angular speeds has been provided by means of which the coils can be operated at the same peripheral speed to thereby equalize the pull on the different strips regardless of variations in the diameter of the coils.

In Figures 1 and 2 of the drawing a center rewind shaft 1 havin the characteristics just mentioned is embodied in a slittin and rewinding machine in which a sing 0 rewinding roll 2 serves both as av cutter roll.- and to deliver the web 3 directly to the peripheries of the rewound coils 4. The cutter roll 2 peripherally engages and rotates the score cutters 5 in the manner described ill the patent referred to so that the web 3 is severed into strips as it is drawn into the machine from the mill roll 6.

The cutter roll 2 serves also. as a drivin means for the rewind shaft 1 through a gear connection which includes a gear 7 mounted on the end of the cutter roll shaft. The cutter roll itself may be driven in any suitable manner through the application of power to the opposite end thereof. The gear 7 preferably meshes with a gear 8 loosely mounted on the shaft 9 and connected through a friction clutch 10 with another gear 11 loose on the same shaft 9 which is preferably journaled in brackets 48 supported on a stay bar 49. The gdar 11 meshes in turn with an intermediate gear 12 which directly drives the pinion 13 on the drive shaft 43 to which the rewind shaft 1 is adapted to be coupled. Through the friction clutch 10 a slip drive or yielding connection is provided and by means of the hand Wheels 44 and the spring 45 the effectiveness of the friction clutch can be varied to thereby decrease the speed of angular rotation of the rewound coils 4 to maintain the .peripheral speed substantially constant as the diameters of the coils increase.

It will be seen that it is necessary to provide for the gradual movement of the rewind shaft 1 farther away from the cutter roll 2 as the diameter of the rewound coils increase with the addition of more material thereto. In the form of the invention shown in Figures 1 and 2 of the drawing provision has been made for this by mounting the intermediate gear 12, the pinion 13 with the drive shaft 43 and the corresponding end of the rewind shaft 1 on an arm 34 which is rigidly mounted on the shaft 9 about which the gears 8 and 11 rotate. It will be seen that by this arrangement the arm' 34 and the parts carried thereby, together with a corresponding arm 42 which sup-ports the other end of the rewind shaft 1 at the other side of the machine, will be pushed outwardly away from the shaft cutter roll 2 by the in creasing diameter of the rewound coils. Since the arm 34 carrying the intermediate gear 12 swings about the same axis about which the gear 11 rotates the gear transmission is not affected by a change in the position of the arm as will be obvious. The outward movement of the arms 34 and 42 is constant] resisted by the weight 46 which is carried by an arm 47 fixed to the shaft 9 and which through the arms 34 and 42 causes the rewind shaft 1 and the coils carried thereby to exert a constant pressure against the cutter roll 2.

While the speed of rotation of the rewind shaft and of the rewound coils as a whole can be controlled toniiaintain the peripheral speed of the rewound icoi-lssubstantially constant through the slip drive construction which has been described, this construction does not rovide for rotating individual coils of di erent diameters on the same rewind shaft at different angular speeds in order to secure a uniform peripheral speed of the several coils and thereby compensate for variations in the diameter of the different coils.

In order to provide for the rotation of different coils on the rewind shaft at different s eeds, a rewind shaft of the type shown in F igure 5 of the drawing, has been provided. This rewind shaft is preferably constructed in sections which are adapted to support the rewound coils and to be driven at different speeds. In this particular embodiment of the invention the rewind shaft is made up of a central section 14 adapted to be positively driven from the drive shaft 43 through a coupling connection shownat 15. The rewind shaft is provided with reduced end portions 16 upon which the sleeves 17 are mounted. The sleeves 17, which may themselves be divided into sections as at 17, ordinarily rotate with and at the same speed as the central section 14 of the rewind shaft. In order to provide for different relative speeds of the sleeves 17 and the central section 14 of the rewind shaft, a slip connection is provided between the sleeves and the central portion of the shaft.

This slip or yielding connection is afforded by means of the pressure springs 18 which press the sleeves into engagement with the shoulders 19 formed by the ends of the central section 14 of the shaft. The pressure exerted by the springs 18 can be varied by means of the adjusting nuts 19 and the locking nuts 20 which operate on a further reduced and threaded portion 21 at each end of the rewind shaft. Fibre washers 22, which are intended to serve as wear pieces, are introduced between the ends of the sleeves 17 and the shoulders 19 of the central portion of the shaft, as well as at the opposite ends of the sleeves. Washers 23 are preferably placed between the springs 18 and the washer 22 at the adjacent ends of the sleeves. These washers are preferably provided with projections 24 which extend into key-ways 25 cut in the reduced portions 21 of the shaft so that the washers 23 are constrained to rotate with the reduced portion 22 and consequently at the same speed of rotation as that of the central portion 14 of the shaft. By this construction it will be seen-that driving members are provided at each end of the sleeve members 17 and the relative speed of rotation of the sleeves and the driving members 19 and 23 is determined by the degree of friction maintained between these members and the sleeves by the pressure of the springs 18. Washers 26 are also provided at the outer ends of the springs 18 and these washers are inturn separated from the adacent adusting nuts 19 by means of a second set of fibre washers 27.

It is necessary in the operation of machines of this nature to make the rewind shafts replaceable. The coupling connection 15 is accordingly mounted so as to slide longitudinally on the drive shaft 43 by means of a spline 28. A spring 29 acts to move the coupling member 15 into position to engage the locking lugs 30 projecting from the corresponding end of the rewind shaft. In order to slide the coupling member 15 along the shaft 43 against the pressure of the spring 29 to thereby disengage the end of the rewind shaft a bell crank 31 having a forked end adapted to engage a groove 32 in the coupling member is pivoted at 33 on the arm 34 and is adapted to be rocked by means of the hand lever 35 on the arm 34. The hand lever 35 is so placed that, when it is grasped by an operator and moved toward the adacent upper end of the arm 34, it will engage and swing the bell crank 31 about its pivot to thereby disengage the coupling member 15 from the end of therewind shaft.

The other end of the rewind shaft is preferably provided with a bearing portion 33 adapted to fit into the notch 34 provided in the upper surface of the extremity of the arm 42 at the other side of the machine. In order to lock this end of the rewind shaft in its seat in the groove 34' a latching member 36 provided with a shaft-engaging notch 41 in its end is slidably mounted on the side of the arm 42 by means of the slots 37 and the studs 38. One of the studs 38 is provided with a wing nut 39 by means of which the latching member 36 can be fastened in its locking position. A handle 40 is provided for moving the locking member into and out of its locking position.

In the form of the invention shown in Figures 3 and 4 the rewound coils 4 are supported on a pair of rewinding I'Olls and 50, as in the surface rewind machine of,

which the patent already referred to is an example. The roll 2 is preferably utilized as a cutter roll as in the form of the machine shown in Figures 1 and 2, and the slitting discs cooperate with the cutter roll 2 to slit the web 3 as it passes through the machine from the web roll 6.

In this form of the invention the rewind substantially uniform diameter, as is the case with the machine shown in Patent No. 1,076,189.

It has been found in practice, however, that in handling certain materials it is not desirable to exert any great amount of pressure on the rewound coils while they are being built up and it is with such materials that the sectional rewind shaft already described can be usefully combined with this type of center rewind machine. Means have accordingly been provided for varying the degree of downward pressure which is exerted by the framework 51 on the rewind shaft 1 and this means takes the form of a sectional counterweight 53' which is connected to the lower end of a rack 52 through a flexible connector 54' passing over a pulley 55 mounted on a fixed bracket 56 integral with the framework of the machine. Sections of the counterweight can be added or removed tovary the pressure exerted through the framework 51 on the rewind shaft 1, as will be obvious.

In this form of the invention as well, as in the form shown in Figures 1 and 2, a slip drive connection is provided for the rewind shaft 1. This driving connection comprises a spiral gear 57 mounted on the end of the shaft of the cutter roll 2 which meshes with another spiral gear 58 journaled in a bracket 59 supported on the framework of the machine. The spiral gear 58 is adapted to rotate a vertical drive. shaft 60 journaled and supported at its upper end in a bracket 61 carried by the framework 51 and provided with a spline 62 permitting it to slide vertically through the spiral gear 58 as the framework 51 carrying the rewind shaft 1 moves upwardly with the increasing diameter of the rewound coils. A friction clutch device forming the slip drive connection comprises a driving member 63 fast to the drive shaft 60 and a driven member 64 rigidly connected to the bevel gear 65 which is free to rotate on the shaft 60. The bevel gear 65 meshes in turn with a bevel gear 66 carried by a shaft 67 adapted to be coupled to the rewind shaft 1 through a suitable coupling connection indicated at 68. By means of the hand wheel 69 and spring 70 the effectiveness of the friction clutch provided by the members 63 and 64 can be varied to thereby vary the speed of angular rotation of the rewound coils 4 to maintain the peripheral speed substantially constant as the diameters of the coils increase.

By means of the hand wheel 71 the pinions 53 can be rotated through the chain 7 2 and sprockets 7 3 and 74 to thereby lift the rewind shaft clear of the rewinding rolls in order to make the rolls more accessible for threading or the like.

It will be seen that, by means of the construction described, provision has been made in slitting and rewlnding machines of the center rewind type for permitting the angular speed of rotation of rewound coils of different size to be varied to the extent necessary to maintain the peripheral speed of the several coils constant, thereby exerting the same pull on all the strips at the slitting point, regardless of variations in diameter amon the rewound coils. The uniformity of thls pull on the different strips will ordinarily be amply secured by the division of the rewind shaft into a central section and two end sleeve sections, but it will be obvious that a still greater degree of uniformity can be secured, particularly when there is a substantial difference between the size of coils on the same sleeve, by dividing the sleeves themselves into sections.

While the invention has been shown and described as particularly adapted for use in slitting and rewinding-machines of the gen.- eral center rewind type, it is obvious that in handling materials in which it is desirable to exert little or no pressure upon the upper surface of the rewound coils in the surface rewind type of machine shown in the patent referred to, the sectional rewind shaft shown and described could be advantageously used. It is to be noted, however, that neither in the surface rewind type of machine, nor in the machine shown in Figures 3 and 4:, and which is, in a sense, a combination of both the center rewind and the surface rewind types, can the sectional rewind shaft be used with the same advantage as in the typical center rewind machine shown in Figures 1 and 2.

What is claimed, is:

1. A slitting and rewinding machine comprising: slitting means including score cutting means for dividing a web without distortion at the plane of severance, rewinding means including a rewinding shaft on which adjacent coils are rewound side by side acting to pull the web through the slitting means, and means for varying the speed of rotation of individual coils to exert an equal pull at all points laterally at the plane of severance notwithstanding differences in diameter of the rewound coils.

2. slitting and rewinding machine comprising: slitting means including score cutting means for dividing a web without distortion at the plane of severance, rewinding means including a rewinding shaft on which adjacent coils are rewound side by side acting to pull the web through the slitting means, and slip friction means for varying the speed of rotation of individual coils to exert an equal pull at all points laterally at the plane of severance notwithstanding differences in diameter of the rewound coils.

3. A slitting and rewinding machine comprising: slitting means including score cutting means for dividing a Web without distortion at the plane of severance, rewinding means including a rewinding shaft on which djacent coils are rewound side by side acting to pull the web through the slitting means, slip friction means for driving the re- Winding shaft, and slip friction means for varying the speed of rotation of individual coils to exert an equal pull at all points laterally at the plane of severance notwithstanding difl'erencesin diameter of the rewound coils.

Signed at Brooklyn, New York, in the county of Kings and State of New York, this 1st day of December, A. D. 1916.

JAMES A. CAMERON. GUSTAF BIRGER BIRCH.

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