US1798440A - Apparatus for vibrating fourdrinier wires - Google Patents

Description

March 31, 1931. J. w. VEDDER 1,798,440-

APPARATUS FOR VTBRATING FOURDRINIER WIRES Filed June 27, 1930 2 Sheets-Sheet 1 March 31, 1931. VE DE 1,798,440

APPARATUS FOR VIBRATING FOURDRINIER WIRES' Filed June 27, 1950 2 Sheets-Sheet 2 Mm 275%): WQI-l-ezzWaefi 6y WWW AW/2 2 M Patented Mar. 31, 1931 UNlTED STATES PATENT OFFICE JOHN WARREN 'VEDDER, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO RICE, BARTON & FALES, INC, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS APPARATUS FOR VIBRATING FOURDRINIER WIRES Application filed June 27,

This invention relates to a paper making machine and particularly to the shaking of the Fourdrinier wire.

The principal objects of the invention are to provide an improved means for shaking the wire which can be used in any of the ways in which the wire is usually shaken and which Will provide for a greater speed; to provide a means for shaking which will result in less wear and tear on the bearings and other parts of the machinery and will involve no extra machinery that would be easily worn out and to provide for shaking the breast roll, or any other roll in the system, in such a manner that it can be pneumatically or mechanically cushioned, and said cushion can be adjusted to change the stroke; also to provide a construction which will be comparatively simple and inexpensive and can be relied upon to operate eliiciently.

Other objects and advantages of the invention will appear hereinafter.

. Reference is to be had to the accompanying drawings, in which Fig. 1 is a side view of'the breast roll and the associated parts of a known type of Fourdrinier machine showing a preferred embodiment of this invention applied thereto, and

Fig. 2 is a diametrical sectional view through the center of the breast roll journal at one end.

Fourdrinier wires have been vibrated or shaken, in a direction transverse to the length thereof, at the breast roll or at some other point along the wire or both, but always by mechanical means. The speed of vibration runs up to over two hundred per minute and is sometimes greater. This vibration comes on the breast roll or other roll journal at the end and is transmitted through the bearings at that end, to the journal and roll, and to the bearings at the other end or is transmitted through a tie frame to the journals. It is ob vious that this is very severe usage and that the bearings and the mechanical vibrating means will break down after a comparatively short life. Repairs are necessary at frequent intervals. The tying of all these parts up to mechanical vibrating devices has been uni- 1930. Serial No. 464,379.

versal heretofore with all the attendant disadvantages.

This invention is designed to provide a cushioned vibration and a means of operation which will permit of material increase in the rate of vibration up to two or three times the number of vibrations per minute heretofore attained without the severe wear on the bearings and connections that have been inherent in this kind of machine heretofore.

This invention is shown as applied to a well-known type of Fourdrinier machine, but the machine is not illustrated in full as the part to be vibrated can be the breast roll itself or a roll at a distance therefrom or both, or framing supporting the rolls. It is not intended to limit this invention to the vibration of any particular roll, so I have shown a roll 10, which may be the breast roll or some other roll, over which the Fourdrinier Wire 9 passes. This roll is provided with bearings 11 at both ends for its journals and these hearings are mounted on plates 12 which are carried by vertical leaf springs 13 which permit 0f the vibration as is well known. In place of the leaf springs other oscillating supporting means can be used.

At one end I provide a variable speed motor 15 mounted on a bracket 16 on the plate 12, and this is geared down by speed-reducing means of any desired construction to a shaft 25. This shaft is provided with a crank 17, cam or any other equivalent means, for operating a connecting rod 18 and a valve rod 19. This valve rod extends across the machine preferably, and operates two double valves 20, each in a valve casing 21, which alternately admits air, steam or liquid on opposite sides of each piston 22. The air can be supplied from a tank 23 filled from a pump 2% operated by the motor 15 or it can be supplied from an air supply system.

Each piston 22 is fixed or mounted integrally on a breast roll journal 26 and is located in a cylinder 27 provided with a split cylinder head supported by the bracket 25. Obviously the operation of the motor will control the admission of air pressure first to one side and then to the other of the piston and move the journal back .and forth at a very high rate of speed. It is believed that a speed of perhaps one thousand complete vibr; tions per minute would be practical with this construction.

In the form shown the piston 22 is double acting, the pressure being admitted first to one side and then to tl other, and the opposite side always being vented to the air. single double acting piston can be used at one end if desired. Also in the form shown there are two of these devices, one on each side of the machine and both connected with the journals of the same roll 10. These, of course can both be made double acting, helping ea l1 other at all time and the two valves working at the opposite onus of the roll in synchronisin as they a e both mounted on the same rod 19. However, each one can be made single act. and all the driving done first from one end of the roll and then from the other end, or single double acting piston can be used. Obviously there are other combinations within the skill of the mechanic for securing this vibration an effective manner.

In the construction shown above, or its equivalent, a high rate of vibration can be secured without positive mechanical means for accomplishing it. Also in this construction an air, oil or spring buffer can be employed to dampen the vibrations at each end of the stroke. This is shown in the form of a cylinder 30 in which a piston or tail shaft 31 on the outer side of the piston 22 constituting the end of the journal 26 operates. This is a single-acting piston and there is always a space 32 at the end in which there is air. This space can be adjusted by a screw plug 33 at the end of the cylinder by which the length of this space 32 for air can be changed. In this way a buffer or dash pot is provided for the shaft, one at each end, to lessen the blow which is imparted to the machinery by the vibration of the roll on the shaft 26. Furthermore, the adjustment just mentioned will vary, as may be desired, the elasticity of this buffer and apportion it to the length of the stroke desired. It will be obvious that a spring or hydraulic means could be used in place of air in this buffer. In the latter case the stroke is controlled by the escape of oil through an adjustable outlet.

Therefore by the use of air for operating the roll the advantages are secured of increased speed, reduced wear, and comparatively inexpensive and durable construction. Steam, oil or water can be used instead of air.

The speed of the motor is such that it will give a constant number of reciprocations to the valve rod between limits of fifty and one thousand complete cycles to and fro per minute. This will in turn control the air entering on each side of the pistons the same number per minute thus giving the exact control of the oscillations of the roll that is desired.

This takes care of the first and second functions of the apparatus.

In order to perform the third function air is compressed at the end of the tail shaft 31 to sufiicient pressure to stop the stroke at any predetermined point and this length of stroke or travel can be altered by screwing in or out this plug 33.

Although I have illustrated and described only a single form of the invention I am aware of tne fact that changes can be made therein by any person skilled in the art witl out departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited to the exact form shown, but what I do claim is 1. The combination in a Fourdrinier machine, of roll for supporting the Fourdrinier wire,supports for said roll at both ends of the roll mounted to vibrate, and pneumatic means for vibrating the roll longitudinally.

2. In a Fourdrinier machine, the combination with means for movably supporting the shaking end of the Fourdrinier wire, of pneumatic means for shaking said means.

3. .he combination in a Fourdrinier machine, of a roll for supporting the Fourdrinier wire, a ournal on which the roll is mounted, bearings for said roll at both ends of the roll mounted on springs to vibrate, and pneumatic means for vibrating the journal longitudinally.

4:. In a paper making machine, the combination of a roll for supporting a Fourdrinier wire, a journal on which the roll is supported, and means for supporting the end of the journal in a condition to allow it to vibrate, of a piston secured to the journal, a cylinder in which said piston is located, and means for intermittently introducing fluid into the cylinder to force the piston to move longitudinally and take the journal with it for the purpose of vibrating the roll.

5. In a machine of the character described, the combination with the roll and its journal, of a piston mounted on the journal, a cylinder in which said piston is located, valve ports for introducing fluid 011 either side of the piston and allowing the exhaust of the air therefrom, a valve for controlling said fluid ports, a shaft, means for operating the shaft, and means connected with said shaft for reciprocating the valve to open and close the ports in proper order to vibrate said piston and the journal on which it is mounted, for the purpose described.

6. In a Fourdrinier machine, the combination with means for movably supporting the shaking end of the Fourdrinier wire, of pneumatic means for shaking said means, a a single acting piston connected with said shaking end, a cylinder in which said piston operates and means for adjusting the effective length of the cylinder to control the amplitude of the vibration.

7. The combination in a Fourdrinier machine, of a roll for supporting the Fourdrinier wire, a journal on which the roll is mounted, bearings for said roll at both ends of the roll mounted on springs to vibrate, pneumatic means for vibrating the journal, a piston on the end of said journal, a cylinder in which said piston is located, and an adjustable screw plug in the end of the cylinder, whereby a fluid can be entrapped in the end of the cylinder beyond the piston constituting a buffer to absorb the vibration of the supporting parts in which said journal is 10- oated, and whereby the amount of fluid so entrapped can be adjusted to control the length of the stroke.

In testimony whereof I have hereunto atfixed my signature.

JOHN WARREN VEDDER.

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