US1917287A - Paper making machine - Google Patents

Description

y 1933. A. ALDRICH ET AL 1,917,287

PAPER MAKING MACHINE Filed Jan. 24. 1951 4 Sheets-Sheet 1 I H n E e I I UD i: UD nn:

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PAPER MAKING MACHINE Filed Jan. 24, 1931 4 Sheets-Sheet 2 iaz July 11, 1933.

A. ALDRICH ET AL 1,917,287

PAPER MAKING MACHINE 4 Sheets-Sheet 3 Filed Jan. 24. 1931 IIIIIIL,

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PAPER MAKING MACHINE Filed Jan. 24, 1931 4 Sheets-Sheet 4 fllarzzo 06 171 65; 4r] 6., Harry,

Patented July 11, 1933 UNITED STATES PATENT OFFICE ALONZO ALDRICH AND EARL E. BERRY, OF BELOIT, WISCONSIN, ASSIGNORS 'I'O IBELOI'I. IRON WORKS, OF BELOIT, WISCONSIN, A CORPORATION OF WISCONSIN PAPER MAKING MACHINE Application filed January 24, 1931. Serial No. 510,877.

This invention relates to paper making machines and to a method of making paper.

It has heretofore been common in the paper machinery art to provide a shaking mechanism for imparting a vibratory movement to the table structure, forming wire and/or breast roll. Recently considerable advance has been made in reducing the weight of the portions of the machine being vibrated for the reason, among others, of enabling speeding up of the machine. However, in spite of these improvements the weight to be moved is enormous, particularly in large machines, and the speed of the machine has been hampered by the lack of adequate means and methods of applying the shake motion.

The present invention deals with improvements in the shaking parts of paper making machines andin the means and method of applying the shake motion. The invention is applicable both to Fourdrinier and cylinder paper making machines, but is herein shown for purpose of illustration as applied to a Fourdrinier machine.

In the making of paper the speed of the shake, that is, the number of complete cycles or vibrations per minute, is an important factor or function in the formation of the sheet of paper, more so since greater efl'orts are being made to increase the speed and consequently the production capacity of paper making machines. Furthermore, because of the varying conditions and requirements in this industry it is desired to readily adapt the shaking function to the needs of the particular job at hand. In other words, because of the different character and quality of the stock, the type and grade of paper to be produced, and the method or practice being used, it becomes necessary to properly coordinate the shake with other functions of the machine. Among these are the speed and pitch of the wire. Assuming a given stock and the desire to produce a certain type or grade of paper by a given method and at the maximum wire speed of which the machine is capable, or at least at such high speed as to secure a comparatively high rate of production and consequently high efiiciency from the machine, the present invention aims to combine and coordinate in proper relationship with the desired speed, the pitch of the wire, the speed and amplitude of the shake, and variations of amplitude longitudinally of the shaking part, and to accomplish this rela- 3 5 'after.

It is an important object of this invention to provide a Fourdrinier construction and shaking mechanism therefor whereby portions of the forming Wire may be subjected to varying degrees of vibration in order to obtain a well 'formed, strong sheet of paper and in order to get difierent effects on the forming portion of the machine depending upon the type of stock or furnish that is being run on the machine.

It is a further important object of this invention to provide independent shaking mechanisms for permanent connection to said Jointed, sectional table-roll rails at salient points and to provide means for adjusting the amplitude of shake of each of the mechanlsms independently of each other from zero to a given maximum to vary the amplitude and effective point of application of the shakmg movement imparted to the forming wire.

It is a further important object of this invention to provide improved shake mechanisms particularly adapted for paper making machines, whereby the shake may be operated at comparatively high speeds commensurate with high speeds of the web forming element and whereby also the amplitude of the shake motion may be quickly and easily adjusted while the machine and shake are in operation.

It is a further important object of this invention to provide improved shake mechanism of the character described adapted to be mounted on the table structure so as to be movable therewith without disturbing the operative connection with the part or parts to be vibrated when the table structure is moved for service requirements as when changing lateral removal. The table may be either of the wire or when changing the pitch.

It is a further important object of this invention to provide a novel and improved method of forming a paper web by varying the amplitude of vibration imparted to the flowing stock on the forming wire at any of a number of points along the length of travel of the wire.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

This invention (Sin a preferred form) is illustrated in the rawings and hereinafter more fully described.

On the drawings Figure 1 is a rear side elevational view of a portion of the table structure including the breast roll of a Fourdrinier paper machine embodying our invention.

Figure 2 is a top plan view of the same with the wire and deckle strap removed.

Figure 3 is a similar fragmentary top plan view with the table structure in laterally removed position, as when changing a wire on the machine.

Figure 4 is a fragmentary top plan view of a shaking mechanism unit.

Figure 5 is a sectional view taken substantially on broken line VV of Figure 4.

Figure 6 is a broken end elevational view of the breast roll and shaking mechanism attached thereto.

Figure 7 is an enlarged detail view of the shaking mechanism with parts in section.

Figures 8 and 9 are fragmentary views of a portion of the shaking mechanism illustrating the movement thereof for different adjustments.

Figures 10 and""11 are fragmentary diagrammatic views illustrati difierent driving arrangements for the sh ziiing mechanism.

As shown on the drawings:

The reference numeral 20 indicates as a Whole the table-roll portion of a table structure of a F ourdrinier paper making machine, the table-roll table of the structure bein preferably of the removable type. Many di ferent constructions for the mounting of a' table-roll table and for its lateral removal during the changing of the forming wire are well known in the art and are exemplified by previous patents granted to us. As is well known in the art, provision is made for movement of the table bodily to take care of service requirements as, for example, when removing the table laterally for changing the wire and for vertically adjusting the table for changing the pitch of the wire. In a removable type Fourdrinier machine, such as here shownin the drawings, the tableis normally supported on jacks or other means and 1S adapted to be lowered or otherwise brought into a position supported on tracks for the fixed or removable type in respect to adjustments for pitch of the wire and in the present drawings we have shown a machine having a table of the removable type. In the drawings, referring to Figure 1, 12 indicatcs one of a number of jacks normally supporting a table and adjustable for lowering the table onto suitable tracks for lateral removal and also for obtaining pitch adjustment of the table. In order to prevent vertical vibration of the intermediate stretch of the table, that is, the non-shaking part of the table, in any vertically adjusted position thereof, we have provided one or more adj ustable connections 13 which anchors to a stationary part, such as the base. The numeral 21 indicates one of a number of track members on which the Fourdrinier table structure is adapted to be supported and over which it is rolled laterally whenever the forming wire is to be changed.

The portion 20 of the table structure comprises side beams 22 and longitudinally extending front and rear table rails 23 and 24, respectively, supported from said side beams 22 by means of a plurality of spring members 25. The usual table rolls 26 are suitably journaled in bearings secured to the table rails 23 and 24. A breast roll 27 is independently mounted, as best shown in Figure 6, from supports 28 by means of a plurality of spring members 29. A forming wire 30 is trained in the usual manner around the breast roll 27 so that the upper run of the wire travels over and in contact with the table rolls 26 and the lower run is guided by suitable idler rolls shown in dotted lines, one of which nearest the breast roll is carried by a spring member 14 suspended from the side beams 22. 4

In accordance with our invention, the table rails 23 and 24 are both formed in jointed sections, as for instance, a breast roll section 31, an intermediate section 32 and.a couch roll section 33. It will be understood that the couch roll section 33 is thus designated merely because it is nearest to the couch roll and not because it is necessarily adjacent thereto. A complete table structure would also include between the couch roll and the table section 33 the usual table section carrying the flat suction boxes or some equivalent suction device. One phase of the present invention is concerned only with the construction of the table roll sectionof the Fourdrinier portion of the machine and with the shaking mechanism associated therewith. Consequently, it has not seemed necessary to include other portions of the table structure or the couch roll in an illustration of our invention.

The couch end rail sections 33 are pivotally mounted, as at 34, upon pivot pins 35 sugported by brackets 36 from the ends of t side beams 22 nearest the couch roll. Said rail sections 33 are thus free to oscillate in a horizontal plane about the pivot points 34 through limited arcs such as permitted by the flexibility of the spring members 25, of which several are positioned at spaced pomts along the sides of the table rail section 33. The joints, indicated generally1 by the reference numeral 37, between t e respectlve table rail sections 31, 32 and 33 are formed by rounded tongues 38 that project mto rectangularly ,cut grooves 39 on ad acent ends of the table rails. Said joints 37 provide hmit-ed pivotal movement between the ends of the respective adjacent table rails. The purpose, as will later more fully appear, of providing the jointed table rails 1s to permit a more or less independent shaking of different portions of the table structure.

The devices, indicated generally by the reference numeral 44, for imparting a shaking movement to the table structure, include a shaking mechanism 45, a standard 46 for connection with said shaking mechanism 45 and a driving means, such as a motor 47. The table rail sections 31 and 32 are provided with bosses 48 positioned at salient points along the rear table rail 24. It will be understood that more or fewer table rail sections may be provided and more or fewer connections with the shaking mechanisms.

The breast roll 27 is provided with a separate shaking mechanism 50 that is similarly connected to a standard 51.

The specific construction of the shaking mechanism 45 is best illustrated in Figures 4, 5, and 7 to 9 inclusive. Each of said shaking mechanisms 45 includes a connecting rod 52 eccentrically connected to a drive shaft 53, as by means of an eccentric strap 54, whereby the drive shaft imparts a crank motion to the connecting rod 52. The free end of said shake arm 52 is bifurcated to provide spaced bearing clamps 55 and 56 in which is mounted a connecting pin 57 which extends beyond both outer sides of the bearing clamps 55 and 56. A shake transmitting link 58 is pivotally mounted at one of its ends on the connecting pin 57 between the bearing clamps 55 and 56 and is pivotally connected at its other end through a ball and socket joint 59 to a connecting member 60 adapted to be bolted to a boss 48. The ball and socket joint 59 comprises a socket 61 formed on said member 60 and a ball 62 having an internally threaded bore 63 for receiving the threaded end of the link 58. On each projecting end of the connecting pin 57 is mounted a swing link 64, the free end of which is mounted on a connecting pin 65 that in turn is mounted in the inner end of one of the spaced arms 66 of a yoke frame 67. Said yoke frame 67 is pivotally supported to swing about a fixed pivot axis provided by pivot pins 68 (Figure 4), each arm 66 being mounted on one of these pivot pins 68 and said pins being suitably mounted in coaxial relation on the side walls 69 of a frame 70 secured to a side beam 22. The yoke 67 serves as an adjustable frame permitting adjustment of the swing links 64, it being apparent that by tilting the yokeon the pivot pins 68, the pivot pins 65 from which the swing links are suspended, will be swung in an are which intersects the center of the ball 62. The purpose of this adjustment will be presently described.

Suitable means may be employed for so adjusting the yoke frame 67 as to shift the position of the pivot pins 65. In the present instance, the arms 66 are joined at their inner ends by a cross piece 71 (Figure 5) to which a screw rod 72 is pivotally connected, as at 73, .111 such manner as to be held against rotation. The screw rod 7 2 extends downwardly below the lower edge of the frame 70. On the lower threaded end of said rod 72 there is threaded a partially split nut 76 having spherical faces and rotatably held in a retaining casting 74 formed integrally with the frame 70. Said casting 74 is split and provided with a vice;

clamp member 7 5 having a handle 78 by means of which the split spherical nut 7 6' may be caused to tightly engage the threaded rod 72 to hold the same against movement. Said nut 76 is provided with an integral shank 77 to which is keyed a hand wheel 79. By means of said wheel 79 the rod 72 may be drawn downwardly, when the vice clamp member 75 is released, to vary the position of the end of the yoke'67 carrying the cross piece 71. The hand wheel 79 thus provides a convenient means for adjusting the position of the pivot axis of the swing links 64, that is, of thepivot pins 65, to vary the amplitude of the vibration transmitted by the shaking mechanism just described to the connected portion of the table rails.

As best illustrated in Figure 8, when the pivot pins 65 are coaxial with the center of the ball 62, no motion is transmitted to the member 60 which connects the shake-transmitting link 58 to the rail, but when the pivot pins 65 have been adjusted to a position out of alignment with the center of said ball 62, vibratory motion will be transmitted to said connecting member 60, depending upon the distance between the axes of the pins 65 and center of the ball 62, approximately the maxi:

mum adjustment and consequently the greatest amplitude of shake movement being obtained when said pivot pins have been adjusted to the position shown in Fig. 9.

' The standard 46 for each individual shaking mechanism 45 is adapted to be connected to said shaking mechanism 45 through a frame 70 by means of a plurality of threaded pins 80 that extend through portions of said standards 46 and are threaded at their extended ends for receiving hand operated nuts 81. When it is desired to move out the table,

structure, as in changing wires, the nuts 81 are turned off of the threaded ends of the pins 80, thereby leaving the shaking mechanisms 45 supported by the frames from the side beams 22 for removal as a unit with the table structure.

For the same purpose, the driving means,- such' as the motor 47, is suitably supported on the adjacent side beams 22 of the table structure as by means of a supporting frame 15 similar to the supporting frames 70, so.

that the table shaking mechanisms are completely carried by and movable with the table structure and consequently will be moved bodily therewith whenever the table is moved. As a common expedient for connecting a driv ing motor to driven members, such as the sectional drive shaft 53, we employ suitable coupling members 83 which allow for disconnecting the motor 47 from the sectional drive shaft 53 for installation, repair or replacement. When moving the table vertically for pitch adjustment it is only necessary to loosen the nuts 81 so that the pins may move freely in vertical slots 80' in the upright portion of the standards 46. g

In Figures 1 to 3 inclusive, all of the various shaking mechanisms 45, including the shakingmechanism 50 for the breast roll 27, are driven from a sin le motor 47. It is nevertheless apparent'i rom the description of the construction of the shaking mechanism 45 that individual adjustment of each shaking mechanism is possible, whereby to vary the amplitude of the Vibratory movement imparted to the table structure at the particular point of connection with the shaking mechanism. Further, this adjustment can obviously be made while the machine is in operation. This permits the operator to'vary the amplitude of shake in accordance with the kind of stock-or furnish being run on the machine. Adjustments of the kind described are particularly advantageous in setting or adjusting the machine to secure the desired functional relationship between the shaking parts and the other factors which combine in formation of the paper. According to our invention not only the speed and amplitude of the shake but also the particular pointof application of the shake and consequently variation of the amplitude longitudinally of the table may he quickly and readily obtained While the machine is in operation. vantage of our invention is of particular consequence in combining the shaking functions with the character or quality of the stock and the speed and pitch of the wire. By combining these functions in the proper relationship, particularly during operation of the machine, the best formation as well as the highest production capacity of the machine may be obtained.

Another feature of our invention is the prior devices.

This 'adprovision of novel shake mechanism adapted to be applied to any part of a paper making machine for the purpose of vibrating the same. In view of the enormous weight of the parts, such for example as the Foul-drinier table, and in further view of the high speeds at which it is desired to operate these machines a considerable problem is involved. The devices heretofore employed are entirely inadequate for the purposes intended by the present invention. The shake mechanism disclosed herein embodies new principles of operation and produces new results in this art. This shake mechanism embodies such novel design and principle of operation as to allow; for high speed operation, that is, it will transmit the shake movements at considerably higher frequencies than is possible with Under normal high speed conditions of operation for which 'ourshake mechanism is adapted, prior devices cannot be operated because of their inherent design and principle of operation and if an attempt is made to operate them at the high speeds they i will be destroyed by reason of their physical limitations. It will be noted that one of the features of our improved shake mechanism is that all of the joints or bearing parts are annular or of the rotary type as distinguished from prior constructions having sliding blocks or parts reciprocating on flat bearing surfaces which must be accurately finished and fitted and are diflicult to lubricate and which develop objectionable wear and are noisy. With annular bearings between the motion transmitting parts these bearings may be of a type permitting easy lubrication and take-up for wear. Furthermore, our invention provides a link motion which may be operated at high speeds as distinguished from the violent action resulting when devices of the prior art are speeded up. Another feature of our invention is that the heavy load is centralized and the work is facilitated by reason of the leverage arrange ment which affords greater leverage advantage in a more compact device than compared with prior devices in this art. As shown in Fig. 5, the shake mechanism is shown as supported both by the standard 46 and the table frame 22. In practice, either or both means of support may be used, according to the particular requirements at hand. The shake mechanism may also be applied as a single unit of such suitable size and proportions as required for the part or parts to be vibrated. suitable connection being provided between the shake-transmitting link 58 and the part to be vibrated.

As to that phase of our invention relating to the application of shake motion of variable amplitudes at spaced points in the length of a sectional or jointed table it should be noted that our invention is not limited to the particular shake mechanism herein disclosed but comprehends the use of other suitable means for the purpose such as the use of a synchronous motor shake mechanism disclosed in the copending application of Lloyd Hornbostel, Serial No. 512,893, filed February 2, 1931.

In Figure 10, aslightly different arrangement of shake mechanism and a separate drive for the breast roll shake mechanism are provided. As illustrated, there are three shake mechanisms. indicated by the reference numerals 90, 91 and 92 attached to the sectional rear rail 24, and a separate shakin A single motor 94 drives a main shaft 95 through couplings 96 and'each of the shaking mechanisms 90, 91 and 92 is connected to said main driving shaft 95 in the manner above described. A separate motor 97 serves to drive the shaking mechanism 93 for vibrating the breast roll. Preferably the motors 94 and 97 are synchronous motors, one of which is provided with an adjustable stator, since the use of synchronous motors permits the synchronizing of the vibratory movement imparted to the table rails and breast roll. Otherwise, if only ordinary, separate motors were used, it would be impossible to synchronize the vibratory movement of the table rails and breast roll. It will also be understood that the synchronous motors are driven from a frequency changer so that the speed of the shake may be varied as well as the amplitude of shake. It is even possible, by turning the stator of one motor to change the phase relation of the shake at the breast roll with respect to the table rolls and thus obtain a cross shake if desired.

In Figure 11 there is illustrated a further arrangement in which synchronous motors are used, as indicated by the reference numerals 100, 101, 102 and 103. In this case all of the synchronous motors are preferably driven from one frequency changer and three of the motors 100, 101 and 102 may have their stators rotatably adjustable to synchronize the shakes in phase or with any desired phase relation between respective motors.

We are aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and we, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

We claim as our invention:

1. In a Fourdrinier paper machine, a sectional table structure, a shaking mechanism operatively associated with a plurality of the table sections, and means forming a part of the shaking means and adjustable during operation thereof for individually vary ng the amplitude of the shaking movement 1mparted to any of said associated table structures from zero to the maximum amplitude.

2. In a Fourdrinier paper machine, a table structure comprising longitudinally extending side beams, jointed table-roll rails, spring members supporting said table-roll rails from said side beams, pivotal supporting means secured to said side beams for the couch roll ends of the table-roll rails nearest-the couch roll, and shaking .mechanisms operatively associated with said table-roll rails, said mechanisms including means for adjustably and independently varying the amplitude of vibration imparted to the table-roll rails at g different points during operation of the mamechanism 93 attached to the breast roll 27.

chine and shake.

3. In a Fourdrinier paper machine, a removable table structure and shaking mechanisms associated and completely removable therewith.

4. In a Fourdrinier paper machine, a laterally removable table structure, an articulated shaking mechanism, driving means connected to said shaking mechanism, and means connecting said shaking mechanism to said table structure for shaking the same and for removal therewith.

5. In a Fourdrinier paper machine, a removable table structure, table-roll rails formed in jointed sections, a plurality of articulated shaking mechanisms ermanently connected to said table-roll rai s for shaking said rails at predetermined points, and driving means stationary with respect to the non-shaking part of the table structure connected to said shaking means.

6. In a Fourdrinier paper machine, a removable table structure including jointed sectional table-roll rails, spring members supporting said table-roll rails, shaking mechanisms connected to said table-roll rails, supporting members on which said shaking mechanisms are releasably mounted, and driving means connected to said shaking mechanisms to permit said shaking mechanism to be carried by said tablestructure during removal.

7. In a Fourdrinier paper machine, a table structure comprising jointed sectional tableroll rails, a movable frame on which said rails are flexibly mounted, and shaking mechanisms mounted on said frame and operatively connected at various points along said jointed rails for vibrating said rails at those points.

8. A Fourdrinier paper machine having table-roll rails and individual shake-transmitting mechanisms applied to said rails individually adjustable to vary the amplitude of the shake motion while the machine and shake are in operation.

9. A Fourdrinier paper machine having table-roll rails and individual shake-transmitting mechanisms for transmitting shake motion to the rails at longitudinally spaced points thereon and individually adjustable while the machine and shake are in operation to vary the amplitude of the shake motion.

10. A Fourdrinier paper machine having table-roll rails and individual shake-transmitting mechanisms applied to said rails, means for driving said shake mechanisms in synchronism, said shake mechanisms being individually adjustable to vary the amphtude of the shake motion during operation without disturbing the synchronism of the combined motion transmitted to the rails.

11. A Fourdrinier paper machine having a table structure including table-roll rails, said table structure being bodily movable as a unit, and shake-transmitting mechanism mounted on the table structure for movement therewith as a unit, said mechanism being connected to the table-roll rails and adj ustable while the machine and shake are in operation to vary the amplitude of the shake motion transmitted to said rails.

12. In a Fourdrinier paper machine, a table structure having a plurality of table-roll rail sections, a plurality of shaking mechanisms connected to said table-roll rail sections for imparting variable vibratory movement thereto, means for driving said shaking mechanisms in synchronism, each shaking mechanism being adjustable for varying the amplitude of the shaking movement independently of the other without disturbing their synchronism.

13. In a Fourdrinier paper machine, a table structure having a plurality of tableroll rail sections, and a plurality of shake mechanisms associated with said sections for imparting shake movements thereto, each of said shake mechanisms comprising an operating part having a crank motion and a shake transmitting linkage connected to a rail section having one link adjustable for changing the throw of another link to vary the amplitude of the shake movement.

14. In a Fourdrinier paper machine, a table structure comprising a plurality of table-roll rail sections, shaking mechanisms connected with certain of said rail sections for imparting vibratory movement thereto, each shake mechanism having an operating part having a crank motion and a. linkage connected to the rail section having one link adjustable for changing the throw of another link to vary the amplitude of the shake motion.

15. In a Fourdrinier paper machine, a ta- 'ble structure capable of bodily movement for any of the purposes described, and one or more shake mechanisms mounted upon and movable bodily with the table structure, each shake mechanism being connected to the table-roll rails of the table structure for shaking the same and having provision for changing the amplitude of the shake movement while in operation, the operative relation of said shake mechanism with the table structure being undisturbed by saidbodily movement of the table structure.

16. A Fourdrinier paper machine having a plurality of table sections and individual shake-transmitting mechanisms for transmitting shake motion to said table sections at longitudinally spaced points thereon and individually adjustable while the machine and'shake are in operation to vary the amplitude of the shake motion of the respective table sections from zero to the maximum amplitude.

17. A Fourdrinier paper machine having a movable table, table rolls mounted thereon with capacity for shake mo'tion, shake mechanism for transmitting shake motion to said table rolls adjustable to vary the amplitude of the shake motion while the machine and shake are in operation, and means supporting said table rolls and said shake mechanism so that they are movable as an assembly with the Fourdrinier table when the latter is moved.

18. A Fourdrinier paper machine having shake mechanism adjustable to vary the amplitude of the shake while the machine and shake are in operation, said mechanism being mounted on the Fourdrinier frame so as to be movable bodily with the latter when it is moved for service requirements.

19. In a Fourdrinier paper machine, a table structure having wire supporting rolls and a frame capable of bodily movement as when changing the pitch or changing the wire, and one or more shake mechanisms mounted on said frame part for movement with said table structure when the latter is moved and serving to transmit shake motion to the table rolls, said shake mechanisms being individually adjustable to vary the amplitude of the shake motion while the machine and shake are in operation.

20. In a paper making machine a Fourdrinier frame bodily movable for changing the pitch or changing the wire and carrying shake mechanisms individually connected to the forming part of the table longitudinally of each other and individually adjustable to 'Fourdrinier frame having shake mechanism mounted thereon and movable therewith, the shake mechanism serving to transmit shake motion to the sheet forming part only and being adjustable to vary the amplitude of the shake while the machine is in operation.

23. In a paper making machine, a movable Fourdrinier frame having shake mechanism mounted thereon and movable therewith, the shake mechanism serving to transmit shake motion to the sheet forming part only, said mechanism including a power driven shaft, shake-transmitting means driven by said shaft, and means for changing the amplitude of the shake movement while the machine is in operation.

24. In a Fourdrinier paper machine, a table structure having a frame part, table rolls and a rail for transmitting shake motion to the table rolls, said table structure being mounted with capacity for movement for changing the pitch of the wire and for movement in connection with changing the wire, shake mechanism carried by and movable with said frame part, said shake mechanism having a power driven shaft, means operated by said shaft for transmitting shake motion to said rail, and means for changing the amplitude of the shake motion, said mechanism and the table structure being movable as a unitary assembly without disturbing the cooperative relation of'the. parts of said assembly when the table structure is moved.

In testimony whereof, we have hereunto subscribed our names at Beloit, Rock County, Wisconsin.

ALONZO ALDRICH.

EARL E. BERRY.

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