US2494245A - Wire guide for papermaking machines - Google Patents

Description

Jan. 10, 1950 K. A. KARLSSON WIRE GUIDE FOR PAPER MAKING MACHINES 2 Sheets-Sheet 1 Filed April 8, 1946 1950 I K. A.VKARLSSON 4,

WIRE GUIDE FOR PAPER MAKING MACHINES Filed April 8, 1946 I Shets-Sheet 2 Patented Jan. 10, 1950 WIRE GUIDE FOR PAPERMAKING MACHINES Karl-Arvid Karlsson, Skapafors, Sweden Application April 8, 194.6, Serial No. 660,357

In Sweden April 13, 1 945 v It is a well known fact that wire-cloths, press felts, drying felts and similar webs are used in connection with paper making machines have a tendency during their usually comparatively long uninterrupted running to displace themselves (or wander) laterally with relation to the guide rolls carrying them. Said displacement, or Wandering, however, must not proceed to such an extent that the web may become damaged or destroyed bystriking .the frame of the machine. .In order to avoid this risk the web had to be restored at intervals to its normal position. To this end it has already been proposed to make the bearing for oneend of the shaft of one of the guide rolls carrying the wire adjustable in the longitudinal direction of the web so that it may be moved within certain .limits in the direction of movement of the web or in the opposite direction, as the case may be, for imparting to the web an impulse of moving laterally in opposition to its sense of wandering, until the web is restored to its normal position.

Such an adjustment of one end of the guide roll may be effected either manually or by mechanical means. The manual adjustment requires the operators perpetual attention and, in certain cases, a special operator is required whose only mission is to look to the web. The mechanical guiding mechanisms hitherto practised are usually of a complicated structure and, therefore, expensive in manufacture and repair. In addition, a very strong power impulse had to be exerted by the web for operating them. Thus, guiding mechanisms of this type cannot be used to advantage, for instance, in connection with press felts and other webs of a soft, porous structure.

The present invention has for its object to provide aguide mechanism, hereinafter referred to as wire guide, which does not suffer from the drawbacks above referred to. Thus, it is simple in structure and can be manufactured at moderate costs and, moreover, it requires but a weak impulse of the wire for its operation and, as a result, it is fit for use also in connection with webs of a soft nature. Compared with the wire guides provided with ratchet wheels and pawls, and which operate ata constant speed, the wire guide forming the subject matter of the invention presents the additional advantage of operating ata speed that is, substantially, depending on the degree of lateral displacement of the wire.

According to a feature of the invention the power as required for effecting the lateral adjustment of the bearing for one end of the shaft of 6 Claims. (01. 74441) I a guide roll for the Wire with a view to correcting the position of the wire is derived from the guide roll itself, while the Wire needs only deliver an impulse for controlling the degree of said adjust? ment. 1

To this end separate means are provided to eifect said adjustment of bearing by power derived from the guide roll itselfand other independent means are provided for regulating the degree of said adjustment under the control of an impulse exerted by the wire. Since said two kinds of means are mechanically independent of each other they may operate independently of each other in direct dependency of the degree of lateral displacement of the wire synchronously therewith, .thereby preventin the occurrence of oscillations during the performance of the Wire correcting operation.

.In. the accompanying drawings in which an embodiment of the invention is illustrated, Fig. 1 is a section on line II in Fig. 2. Fig. 2 is a section on. line II-II in Fig. l, and Fig. 3 is a section on line IIIIII in Fig. l.

. With .referenceto the drawing the numeral I designates the wire of a paper machine, not shown, 2 is. a guide roll therefor by means of which correction of thelateral displacement of thewire is to be'effected, and 3 is the shaft end of said roll facing the operator side of the machine. Said shaft end is rotatably mounted in a hearing A in turn slidably mounted in a stationarybedplate 5. To this end the bed plate is provided with a longitudinal slot 6 engaged by a cylindrical block I on the under side of the bearing, so that the bearing may be adjusted in a horizontaldirection parallel with the longitudinal direction of the wire I. In order to prevent the bearing from being accidentally lifted out of engagement with the guideway, the cylindrical block I. carries at its lower end a plate 8 bearin against thelower surface of bed plate 5 at both sides of the slot 6 therein.

Theshaft end of the guide roll 3 situated at the opposite side of the machine is mounted in a stationary bearing which should be rotatably around a vertical aXis, which may be represented, for instance, by a journal similar to I mounted in. a cylindrical boring of. a stationary bed plate.

The shaft end 3 shown carries an eccentric or cam .9 surrounded along its lower half periphery by a metallic arc IU of such a shape as to be reciprocated by the action of the eccentric or cam 9 in a horizontal direction at right angles to the longitudinal direction of shaft end 3 upon the rotation of the latter but is immovable in vertical direction. The metallic arc I is supported by two diametrically opposite bolts H extending in the stated direction of movement of the metallic arc and are slidably mounted in borings formed in the side walls of the bearing 4 beyond which walls they project to a certain extent. Upon the rotation of shaft end 3 said bolts will thus be moved to and fro.

Provided in front of the end of each bolt H is an axial cam in the shape of an arced wedge l2 swinging around a shaft l3 common to both wedges which is parallel with the bolts H. The centre of curvature of the wedges is on the axis of shaft 13 and the radius of curvature thereof is equal to the distance between the axis of shaft 13 and the axis of bolts ll. As a result, the wedges are always situated in front of the respective bolts H. The two wedges are exactly equal but oppositely directed. Their surfaces remote from the bolts are plane and form right angles with the axis of the bolts. The means for supporting each wedge comprises a strip or band, as for instance, a flat spring l4 connecting the wedge to a supporting member [5 clamped to shaft I3. Shaft I3 is rotatably carried by pointed pivots i6, 50 as to form together with the members l5, l4 and I2 an easily moving pendulum. Carried by a separate supporting member [1 clamped to shaft I3 is a depending arm l8 which carries in turn an impulse member adapted to be engaged by one edge of the wire. Said impulse member may comprise a plate or the like, as indicated by dotted lines in Fig. 1. It is understood that a similar impulse member is provided at the opposite edge of the wire where it may be carried bya separate shaft similar to shaft 13 which constitutes, in combination with shaft l3 shown, the impulse member supporting arms, and a connecting rod between said arms, a link parallelogram. The entire pendulum system is balanced by means of a counter-weight I9 which in the exampleshown is adjustably mounted on a bolt carried by the supporting member I! which may be clamped in the position desired by means of a screw. By means of this counter-weight the system may be exactly balanced so that it obtains an indifierent equilibrium and can be started by a minimum of power.

The pointed pivots 16 supporting the shaft l3 comprise the conically tapering ends of screws extending through threaded borings in heads 2| of columns 22 which are in turn fastened to frames 23 provided immediately outside the plane vertical surfaces of the wedges 12, the frames being in their turn formed with plane vertical surfaces facing those of the wedges. The space between adjacent vertical surfaces of the wedges and the frames is very small amounting to some tenths of a millimeter. For the sake of clearness, however, said space is over-dimensioned in the drawing.

The mechanism above described operates as follows:

Normally, that is, when the wire is in proper position with relation to the guide roll shown, the springs M depend vertically keeping the wedges l2 in a position in which they are just about to be engaged by the reciprocating bolts H. Assuming the wire starts displacing itself laterally, as for instance, towards the operator side of the machine, then a swinging of the pendulum system towards the spectator in Fig. 1, downwardly in Fig. 2 and to the left in Fig. 3 takes place. This means that a Wider portion of the left hand wedge (Fig. 2) and a narrower portion of the right hand wedge will enter the spaces between the respective bolts H and frames 23. Thus, the left hand bolt II will strike the respective wedge forcing it against the frame and is then prevented from moving further to the left under the action of the eccentric or cam 9. The continued action of the eccentric or cam on the left hand side of the are ill will therefore cause a corresponding displacement of the cocentric 9 and shaft end 3 to the right. This displacement corresponds to the shortening of the stroke of the left hand bolt by the movement of the respective wedge. Since the right hand wedge has increased the space between it and the right hand bolt II by an amount exactly equal to the decrease of the stroke of the left hand bolt as caused by the left hand wedge, the displacement of the eccentric and shaft end to the right just described will meet no obstacle.

By said adjustment of the shaft end the guide roll shown is set to an oblique position, thereby giving the wire a tendency to wander back to its normal position. According as this restoration proceeds the pendulum system is restored to normal.

Since the lateral displacement of the wire needs only cause an impulse for controlling the degree of the adjustment of the guide roller position and said impulse needs only operate a balanced system, while the power for effecting the adjustment proper is derived from the guide roll itself, then the wire needs only yield a very weak impulse, which can never cause any damage of the edges of the wire.

What I claim is:

l. A wire guide for paper making machines comprising in combination, a roll over which the wire travels, a shaft for said roll, an adjustable bearing for one end of said shaft, a frame having a guideway for said bearing extending in the longitudinal direction of the wire, and a mechanism for shifting the position of said adjustable bearing in said guideway to cause the roll to neutralize an undesired side movement of the Wire on the roll, said mechanism comprising elements carried by the adjustable bearing for reciprocating in th direction of its guideway within a predetermined range of movement with relation to the bearing, means operable by the shaft of the guide roll to reciprocate said elements as a unit within said range upon rotation of the shaft, means mounted in said frame to move as a unit in paths traversing those of said reciprocating elements in order to afford stop members therefor so as to thereby control the position of the range of movement of said elements with respect to the frame, and means in said frame operable by the wire in response to side movement thereof for shifting the position of said stop members with a resulting shifting of the range of movement of the reciprocable elements of the bearing with relation to the frame and a consequent shifting of the position of the adjustable bearing in its guideway to allow the guide roll to neutralize the slide movement of the wire.

2. A wire guide for paper making machines comprising in combination, a roll over which the wire travels, a shaft for said roll, a bearing adjustable in the longitudinal direction of the wire for supporting one end of said shaft, a frame having a guideway for said adjustable bearin and a mechanism for shifting the position of said adjustable bearing in said guideway to allow the roll to neutralize an undesired side elements as a unit within said range upon rotation of the shaft, wedge-shaped members mounted in said frame to-move as a unit in a direction perpendicular to that of said reciprocating bolts, said wedge-shaped members mounted in said frame to move as a unit in a direction perpendicular to that of said reciprocating bolts, said wedge-shaped members having parallel surfaces traversing the paths of the bolts under an oblique angle, so as to afford stop surfaces therefor, thereby shifting the range of movement of the bolts with relation to the frame upon a movement of the wedge-shaped members, and means in said frame operable by the wire in response to side movements thereof for correspondingly shifting the position of said wedge-shaped members with a resulting shifting of the range of movement of the bolts with relation to the frame and a consequent shifting of the position of the adjustable bearing in its guideway.

3. A wire guide for paper making machines comprising in combination, a roll over which the wire travels, a shaft for said roll, a frame having a guideway extending in the longitudinal direction of travel of the wire, a bearing adjustable in said guideway for supporting one end of said shaft, and a mechanism for shifting the position of said adjustable bearing in said guideway to cause the roll to neutralize an undesired side movement of the wire on the roll, said mechanism comprising two bolts slidably mounted in borings formed in the adjustable bearing on opposite sides of the shaft in a direction parallel to the guideway for the bearing, each of said bolts projecting by both of its ends through the respective boring, an arc-shaped element connecting the inner ends of said bolts,

a cam on the shaft for operating said arc-shaped element to cause it to reciprocate the bols as a unit in their borings upon the rotation of the shaft with a range of movement with respect to 'the bearing which depends on the degree of eccentricity of said cam, a shaft rotatably mounted in the frame which extends in a direction at right angles to that of the roll, a pair of curved wedges supported by said shaft to traverse the path of said bolts with their oblique faces forming equal oblique angles with relation thereto, and another member carried by said shaft, to engage an edge of the wire in order to change the angular position of the wedge supporting shaft in response to a side movement of the wire.

'4. A wire guide as claimed in claim 3, having the further characteristic feature that the said curved wedges are bent concentrically with respect to their supporting shaft.

5. A wire guide as claimed in claim 3, and in which the curved edges are bent concentrically with respect to their supporting shaft, having the further characteristic feature that said members are bounded at their edges remote from the bolts, by plane surfaces lying in planes at right angles to the supporting shaft, and at their edges facing the bolts by parallel spiral surfaces forming equal oblique angles with the path of movement of the bolts.

6. A wire guide as claimed in claim 3, in which means are provided to balance said wedge supporting shaft and the elements supported therey.

KARL ARVID KARLSSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 994,910 Duesterhoff June 13, 1911 1,842,946 Prins Jan. 26, 1932 2,342,863 Hlavaty Feb. 29, 1944

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