JP3398539B2 - Press roller drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press roller driving device, and more particularly, to a press roller driving device. The pair of press rollers are mounted, the center axis of the outer rolling roller is inclined with respect to the axial direction of the press roller, and the pair of press rollers is driven by the rotation of the rolling roller accompanying the rotation of the beam. The present invention relates to an improvement in a press roller driving device of a type in which rollers are axially moved in opposite directions. 2. Description of the Related Art As a press roller driving device of the type described above, there is known a device disclosed in Japanese Utility Model Publication No. 52-13385. In this prior art, two sets of support units each comprising three cylindrical rolling rollers are spaced apart in the axial direction of the beam, and a pair of support units is provided in each support unit by the three rolling rollers. One end of the press roller is held. Here, the support shaft of the center rolling roller is arranged parallel to the axial direction of the press roller, and the support shaft of the outer rolling roller is arranged to be inclined in a direction opposite to the axial direction of the press roller. I have. In this way, the central axis of the outer rolling roller (coincident with the central axis of the support shaft) is inclined with respect to the axial direction of the press roller. The press roller is in a state where the rolling roller and the peripheral surface are pressed against each other due to the weight of the loaded beam. In such a configuration, when the beam is driven to rotate, the press rollers and, consequently, all the rolling rollers carrying them are driven and rotated in the same direction. Since the center axis of the outer rolling roller is inclined with respect to the axial direction of the press roller, the rotation direction of the outer rolling roller is also inclined with respect to a line orthogonal to the axis of the press roller. Therefore, during this rotation, a component force in the axial direction of the press roller of the rotational moment of the outer rolling roller is generated, and by the action of this component force,
The pair of press rollers move in the axial direction opposite to each other while rotating. Each press roller moves until its tip contacts the inside of the flange of the beam, and then rotates while pressing the inside of the flange at the tip. By the beam being in contact with the press roller via the warp winding surface, the warp winding portion is formed hard and the surface is formed smooth. Note that the force for moving the press roller in the axial direction needs to be set to an appropriate value. This is because if the force for moving the press roller in the axial direction is small, the press roller may be moved in the opposite direction by the twisting torque of the warp. Further, even if the press roller moves in a predetermined direction, it takes time for the tip to reach the flange, during which the warp is softly wound around the beam. Furthermore, since the tip does not abut stably on the flange, the winding hardness of the warp near the inside of the flange decreases. Conversely, if the moving force is large, the force for pressing the tip against the flange becomes too large, and the tip portion is easily worn. However, in the case of this prior art, as shown in FIG. 11, the press roller 9 and the rolling roller 15 in the pressed state are in point contact with a part G of the peripheral surface. are doing. On the other hand, the driving force from the rolling rollers to the press roller is generated by a frictional force between the two. Therefore, in the case of point contact, the frictional force is unstable and small. As a result, it is extremely difficult to set an appropriate driving force in the axial direction of the press roller 9 transmitted from the rolling rollers to the press roller. That is, the force for moving the press roller 9 in the axial direction can be set by the degree of intersection of the support shaft of the outer rolling roller 15 with the axis of the press roller, but the frictional force generated at the point contact portion is unstable in the first place. Therefore, it is difficult to set the degree of intersection at which a proper driving force in the axial direction of the press roller 9 is obtained. In addition, there is a problem that local wear of the contact point of the rolling roller with respect to the press roller easily occurs due to the point contact. In view of the state of the prior art, an object of the present invention is to provide a pair of press rollers carried by two sets of support units each comprising three parallel rolling rollers, and to form an outer rolling roller. Of the press roller in a press roller driving device of the type in which the central axis of the press roller is inclined with respect to the axial direction of the press roller, and the press roller An object of the present invention is to set an appropriate driving force in the axial direction without performing a complicated adjustment operation and to suppress local wear of the rolling rollers. According to the present invention, in a press roller driving device of the above-mentioned type, at least one outer rolling roller in each support unit has a truncated conical shape and a spherical bearing. The gist of the present invention is that it is inserted into the support shaft via the. DETAILED DESCRIPTION OF THE INVENTION When the beam is stopped, the press roller and the outer rolling roller are in line contact.
When the beam starts to rotate, the rolling roller is driven to rotate together with the press roller. Since the shape of the outer rolling roller is a truncated cone, the rotating outer rolling roller attempts to change its direction to a smaller diameter while abutting the press roller. As a result, when the outer rolling roller and the press roller approach the point contact from the line contact to the point contact, the rotational resistance increases because the peripheral surface of the rolling roller is inclined, and the rolling roller assumes a posture with less resistance. It returns to the original line contact. However, as the driven rotation continues, the rolling rollers approach point contact again. Eventually, the rolling rollers reciprocate between the line contact and the point contact with the press roller. FIG. 1 and FIG. 2 show an example of an outer rolling roller used in a press roller driving device according to the present invention. That is, a truncated conical rolling roller 5 is fitted via a spherical bearing 3 to a support shaft 1 appropriately supported by a frame (not shown) of the apparatus. In the state shown in FIG. 1, the rolling roller 5 is upright, and the center axis 4 is in the same direction as the center axis 6 of the support shaft 1. In the state shown in FIG.
Is inclined, and its central axis 4 intersects that of the support shaft 1. When the rolling roller 5 in the state shown in FIG. 1 supports the press roller, the center axis 4 of the rolling roller 5 is inclined as shown in FIG. 13, and the rolling roller 5 and the press roller 9 are in line contact. Become. When viewed from the direction P in FIG. 13, the state of the rolling rollers 5 is as shown in FIG. FIG. 3 shows an example of a state where the press roller is held by the support unit of the apparatus of the present invention including such outer rolling rollers. That is, the support unit is composed of two outer rolling rollers 5 and one central rolling roller 7, and these rolling rollers cooperate to carry a pair of press rollers 9. I have. Each of the rolling rollers 5 and 7 is made of hard nylon, and the press roller 9 is made of metal such as iron. Further, these press rollers 9 are pressed by the beam 11 via the rolling rollers, and the rolling rollers and the press rollers are in a pressure contact state. In addition, the cylindrical rolling roller conventionally used can be used for the center rolling roller 7 as it is. In each support unit, it is desirable to apply the present invention to rolling rollers on both outer sides of each supporting unit. However, the present invention is realized by applying to at least one outer rolling roller. In this case, similarly to the central rolling roller, a conventional rolling roller can be used as the other outer rolling roller. FIG. 4 shows an example of a state in which a beam is held by the press roller driving device of the present invention. Each support unit includes a space 2 having three support shafts 1 and three rolling rollers 5, 5, and 7 rotatably provided on each support shaft 1. In this example, in each support unit, the present invention is applied to both outer rolling rollers. Further, the support unit is arranged so as to hold near both ends of the press roller 9. Unlike the conventional case, the support shaft 1 of each outer rolling roller 5 is arranged parallel to the direction of the center axis of the press roller. When the present invention is applied to the rolling rollers on both sides as described above, it is necessary to reverse the inclination directions of the peripheral surfaces of both the rolling rollers. With this setting, when the beam 11 rotates, the pair of press rollers 9
Move in opposite axial directions. The supporting unit is supported on the tip of a pair of swing arms (not shown), and is configured to approach and separate from the beam from below the beam by swinging the swing arm in the vertical direction. Have been. Next, the operation of the press roller driving device of the present invention having the above-described structure will be described with reference to FIGS.
14 will be described. (1) First, the support unit is moved by the swing of a swing arm (not shown), and the pair of press rollers are brought into contact with the lower peripheral surface (winding surface) of the stopped beam. The states of the press roller 9 and the rolling rollers 5, 7 at this time are shown in FIGS. 6, 7, and 13. FIG. 7 shows the same state when the rolling rollers 5 are viewed from the P direction in FIG. 13, that is, the same state as FIG. At this time, the center axis 4 of the rolling roller 5 and the center axis 6 of the spherical bearing 3 (the same as the center axis of the support shaft 1) coincide with the coordinate y direction shown in FIG. Only in the z-direction. In the coordinates shown in FIG. 6, the x direction is the direction of the center axis of the support shaft 1, and the z direction is the direction of a straight line connecting the center of the press roller 9 and the center of the support shaft 1 of the rolling roller 5,
The y direction indicates a direction orthogonal to the x direction and the z direction.
Then, as shown in FIG.
Is in a line contact state. (2) When the beam 11 is rotated for winding the warp in a state where the pair of press rollers 9 are in contact with the beam 11, the press roller 9 and the rolling rollers 5, 7 are rotated as shown in FIG. Followed rotation starts in the direction shown in. At this time, a peripheral speed ω proportional to the diameter of the rolling roller 5 is generated on the peripheral surface of the rolling roller 5 at the contact point between the press roller 9 and the rolling roller 5 as shown in FIG. Therefore,
After the start of rotation, the outer rolling rollers 5 (frusto-conical shape) have different diameters in the axial direction, and thus change their postures so as to bend to smaller diameters. That is, the posture starts to change in the Y direction as shown in FIGS. With the change in the posture, the rolling roller 5 and the press roller 9 approach the point contact shown in FIG. 8 from the line contact shown in FIG. More precisely, the peripheral surface of the rolling roller 5 at the portion in contact with the press roller 9 is
Since it is slightly crushed by the pressing force, it is shorter than the length of the line in the state of FIG. 6, but is maintained in the line contact state. (3) When the posture starts to change in this way, as shown in FIG. 8, the axial direction of the central axis 4 of the rolling roller 5 and the axial direction of the press roller 9 are minutely crossed with respect to the Y direction. θ2 is formed. That is, the central axis 4 of the rolling roller 5 is inclined in the y direction with respect to the axial direction of the press roller 9. At this time, x, y
A velocity component in the direction is generated. Since a frictional force is generated at the contact portion between the press roller 9 and the rolling roller 5 in the direction of the peripheral speed ω, a frictional force component in the x and y directions is also generated in the frictional force. The frictional component in the x direction acts as a force for moving the press roller 9 in the axial direction. (4) If the rotation of the rolling roller 5 continues in a state in which a small crossing angle θ2 is formed, the position of the peripheral surface portion 8 of the rolling roller 5 in contact with the press roller 9 in the Z direction. Tries to displace. More specifically, the peripheral surface portion 8 shown in FIG. 9 shifts from a state parallel to the x direction to a cross state, and attempts to change the position in the z direction. However, since the position of the peripheral surface of the press roller 9 in the z direction is fixed, the rotational resistance to the rolling roller 5 increases,
Eventually, the rolling roller 5 attempts to return its posture in the direction in which the resistance decreases. That is, the posture is changed in the direction opposite to the direction in which the posture is changed from FIG. 6 to FIG. 8, and the state returns to the initial line contact state. However, (5) For the same reason as in the case of the step (2), the rolling roller 5 changes its posture again in the Y direction. Thereafter, the above steps (2) to (4) are repeated. Therefore, the rolling roller 5 reciprocates between the perfect line contact and the approximate line contact with the press roller 9. During this period (5), the pair of press rollers 9 move in opposite axial directions until they hit the flange of the beam by the mechanism described in FIG. As described above, according to the present invention, since the outer rolling rollers 5 reciprocate between the perfect line contact state and the approximate line contact state with respect to the press roller 9, the outer rolling rollers 5 are always in point contact. The overall contact area will be larger than in some prior art. The force for moving the press roller 9 in the axial direction is determined by the shape of the outer rolling roller 5, in other words, the inclination angle θ1 of the truncated cone, and the shape is appropriately determined at the design stage. Becomes unnecessary. The inclination angle θ1 of the truncated cone is desirably 0.3 degrees <θ1 <1.5 degrees.
In particular, it is desirable that θ1 be in the range of (0.5 ± 0.1) degrees. The intersection angle θ2 differs according to θ1, and θ2 increases as θ1 increases. The specific design specifications of the outer rolling rollers are as follows. The maximum diameter at both ends in the axial direction is 80.5 m.
m, minimum diameter is 79.5mm, thickness in axial direction is 50mm
It is. The inclination angle θ1 is 0.57 degrees. Next, the structure and operation of the prior art will be briefly described with reference to FIGS. As shown in FIG. 10, the cylindrical rolling roller 15 is
Is fitted. This fitting is, of course, an upright fitting. FIG. 11 shows an example of the pressure contact state between the two. FIG. 12 shows an example of a conventional press roller driving device.
As in the case of the apparatus of the present invention, the outer rolling roller is cylindrical, and the center axis of the support shaft is inclined with respect to the axial direction of the press roller, so that the outer rolling is performed. The difference is that the central axis of the roller is inclined with respect to the axial direction of the press roller. As described above, since the contact portion of the rolling roller with the press roller is increased as a whole, the frictional force on the press roller is increased, and as a result, an appropriate driving force can be obtained without complicated adjustment work. Can be In addition, local wear of the rolling rollers is suppressed by an amount corresponding to the increased contact portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional side view showing an example of an outer rolling roller used in a press roller driving device of the present invention in an upright fitting state to a support shaft. FIG. 2 is a cross-sectional side view similarly showing a tilted fitting state to a support shaft. FIG. 3 is an end view showing a state in which a roller and a beam are held by rolling rollers; FIG. 4 is a bottom view of the same. FIG. 5 is an explanatory side view showing a state in which a rolling roller and a press roller are pressed against each other; FIG. 6 is a transparent plan view showing one step of the operation of the press roller driving device of the present invention. FIG. 7 is a side view of the same. FIG. 8 is a transparent plan view showing another step of the operation of the press roller driving device of the present invention. FIG. 9 is a plan view of the same. FIG. 10 is a sectional side view showing a rolling roller used in a conventional press roller driving device. FIG. 11 is a perspective view showing a state in which a circumferential roller is pressed against a rolling roller and a press roller in a conventional technique. FIG. 12 is a bottom view showing a state in which a conventional press roller and a beam are held by rolling rollers. FIG. 13 is an end view showing the transition of the displacement of the rolling roller of the present invention in the Z direction. FIG. 14 is an end view showing the transition of the displacement of the rolling rollers of the present invention in the Z direction. [Description of Signs] 1 Support shaft 3 Spherical bearing 5 Frusto-conical rolling roller 7 Central rolling roller 9 Press roller 11 Beam 13 Flat bearing 15 Conventional rolling roller

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D02H 5/00

Claims (1)

(57) [Claims 1] A pair of press rollers are mounted by two sets of support units each including three parallel rolling rollers, and a center axis of the outer rolling rollers. Are tilted with respect to the axial direction of the press roller, and the pair of press rollers are axially moved in the opposite direction by the driven rotation of the rolling rollers accompanying the rotation of the beam. A press roller driving device, characterized in that at least one outer rolling roller has a truncated cone shape and is fitted on a support shaft via a spherical bearing.