JP4853830B2 - Push cup - Google Patents

Description

  In the present invention, when a web or a wire rod is wound around a core, or when a web or a wire rod wound around the core is unwound, a pair of support shafts that support the core from both sides can be easily used. The present invention relates to a push cup provided at the tip of a support shaft so that it can be attached and detached.

  In general, a paper tube, a plastic tube, a metal tube or the like is used as the winding core, and at least both ends of the winding core are hollow. Conventionally, a push cup as described above has a head portion inserted into the hollow end portion of the core, and a flange portion that engages with the end surface of the core core into which the head portion is inserted to restrain the core in the axial direction. It has. The push cup is provided at the tip of each of the pair of support shafts, and the pair of support shafts are arranged concentrically on a common horizontal center axis with the tips facing each other, and move along the center axis. So that they can approach and separate from each other. In order to support the core with the pair of support shafts, after the core is disposed between the pair of press cups, the head of the press cup is moved until the pair of support shafts are brought close to each other and the collar portion comes into contact with the end surface of the core. Insert the part into the end of the core. In order to transmit the winding drive force or braking force to the core, the inner peripheral surface of the core is pressed and tightened to the head of the press cup provided on at least one of the pair of support shafts. A gripping mechanism is provided. As this gripping mechanism, it is arranged at equal intervals in at least three places in the circumferential direction of the push cup body concentrically mounted on the tip of the support shaft, and there is a difference in height along the circumferential direction of the push cup body. The push cup body that holds the inclined surfaces that are inclined so as to occur, the rollers that are respectively disposed on the inclined surfaces, and the rollers that can roll along the inclined surfaces while maintaining an equal distance from each other. And a ring-shaped cage that is concentrically pivotably attached, and a radially expanding / contracting ring that is attached to the top of the rollers so as to collectively surround the rollers. Patent Document 1).

In this conventional push cup, when the core is not held, the expansion / contraction ring contracts in the gripping mechanism and the roller moves to the lowest part of the inclined surface. The outer diameter of the contracted expansion / contraction ring is It is slightly smaller than the inner diameter. During winding, the push cup body receives a driving force, and the core receives a braking force from the material to be wound, so the push cup body tries to rotate relative to the core. When the head of the push cup is inserted into the end of the core and winding is started, the push cup body usually receives a driving force from the take-up drive mechanism and has a portion with a high inclined surface with respect to the core. Rotate in a direction that goes from the lower part to the lower part, and the expansion / contraction ring that is in contact with the inner peripheral surface of the core is integrated with the core by the frictional force with the inner peripheral surface of the core, and rotates with respect to the press cup body. As the expansion / contraction ring rotates, the rollers sandwiched between the expansion / contraction ring and the inclined surface roll and move along the inclined surface from the low part to the high part, and the expansion / contraction ring expands in the radial direction and automatically winds. Press and tighten the inner peripheral surface of the lead. As the rollers move, the cage also rotates with respect to the press cup body while maintaining the distance between the rollers, and each roller moves on the inclined surface by an equal distance to expand the expansion / contraction ring by an equal amount. it can. Therefore, normally, even when the winding core is eccentric with respect to the pressing cup main body when the head of the pressing cup is inserted into the winding core, the winding core can be held concentrically during winding.
Utility Model Registration No. 2554803

  However, the inner diameter of the winding core varies due to processing accuracy and the like, and the inner diameter of the winding core may be larger than expected compared to the outer diameter of the head of the push cup. In this case, when the head of a conventional push cup is inserted into the end of the core, the expansion / contraction ring contracts and the roller returns to the lower part of the inclined surface. It is eccentric with respect to the head of the push cup by the gap between the inner peripheral surface of the core and the head of the push cup or the outer peripheral surface of the expansion / contraction ring. When winding is started in this state and the press cup body receives a rotational force, the core is normally securely tightened and fixed concentrically to the press cup body. If the gap on the outer peripheral surface of the cup head is too large, only a slight frictional force is generated at the contact portion between the contracted expansion / contraction ring and the inner peripheral surface of the core, and the two slip each other. The expansion force necessary to hold the concentricity cannot be obtained. Further, when the winding core is supported by the support shafts on both sides, the flange portions of the pair of push cups press both end surfaces of the winding core, so that a frictional force is generated between the front surface of the flange portion and the core end surface that are in contact with each other. And even if the expansion / contraction ring tries to expand due to the relative rotation of the core and the press cup body immediately after the start of winding, the frictional force between the front surface of the buttock and the core end surface becomes larger than the expansion force of the expansion / contraction ring, Often, an eccentric core cannot be returned to the concentricity during winding. Therefore, in the conventional press cup, when the core has a larger inner diameter than expected, the core cannot be securely held, and the core continues to the press cup body during winding. There arises a problem of rotating while slipping intermittently or intermittently or rotating in an eccentric state. In particular, the above-described problem becomes significant when a core having a slippery inner peripheral surface such as a plastic tube is used as the winding core.

  Therefore, the present invention provides an eccentricity of the core even when the clearance between the inner peripheral surface of the core and the outer peripheral surface of the press cup head is relatively large, and even when the friction coefficient of the inner peripheral surface of the core is relatively small. It is an object of the present invention to provide a push cup having a simple structure that can be securely held so as not to be damaged, is easy to attach and remove the winding core, and has a simple structure.

  The present invention is a push cup that is provided at the tip of a pair of support shafts that support the core from both sides in its longitudinal direction, and that holds and releases the end of the core, and is provided at the hollow end of the core. And a gripping mechanism provided on the head and capable of pressing and tightening the inner peripheral surface of the core, and the gripping mechanism is mounted or formed concentrically on the tip of the support shaft. An inclined surface disposed at equal intervals in at least three locations in the circumferential direction of the pressed cup body and inclined so as to produce a height difference along the circumferential direction of the pressed cup body, and on each of the inclined surfaces A movable body arranged in each case, and an annular retainer that is concentrically attached to the main body of the push cup, and holds the movable bodies so that they can move along the inclined surface while maintaining an equal distance from each other. Mount on the top of the movable body to surround the movable body in a lump Further, the expansion / contraction ring that can be expanded and contracted in the radial direction, and when the winding core is not mounted, the retainer is pushed so that the movable body moves to a higher portion of the inclined surface, and the inclined surface is lower than the cup body. It is characterized by comprising a spring device provided between the retainer and the push cup main body, which is elastically biased in the direction from the portion to the high portion.

  According to the present invention, even when the difference between the inner diameter of the winding core and the outer diameter of the head of the pressing cup is relatively large, and even when the inner peripheral surface of the winding core is relatively slippery, The surface can be pressed and tightened and held concentrically with the support shaft, and a push cup with a simple structure that is easy to operate can be provided. And it can prevent rotating while the winding core is eccentric during winding, or rotating the winding core while intermittently or continuously slipping.

  It also has a hook that engages the end face of the core into which the head is inserted and restrains the core in the axial direction. The hook is fixed to the fixing cup body and the rear part of the cage. The inner peripheral surface of the winding core and the expansion / contraction ring are provided by including a fixed rotary gutter whose front surface is in contact with the end face of the core, and a plurality of spheres or rollers that roll and contact the cage and the fixing gutter. In addition to the frictional force of the core, the frictional force between the end surface of the core and the collar can be used to move the movable body to the higher part of the inclined surface. It can be securely tightened and held.

  FIG. 1 is a side view of a push cup according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the cross section taken along the line AA in FIG. 1 in the direction of arrow B, and FIG. It is a rear view of a pushing cup when is not holding the core.

  The push cup 1 is provided at the tip of the support shaft 2 to hold and release the end of the core C. The head 3 is inserted into the hollow end of the core C, and the head 3 is engaged with the end face of the core C into which the core 3 is inserted to restrain the core C in the axial direction, and the inner peripheral surface of the core C provided on the head 3 can be pressed and tightened. And a gripping mechanism 5. The support shaft 2 shown in FIG. 1 is one of a pair of support shafts that support the core C from both sides in the longitudinal direction. The push cup 1 shown in FIG. It is in the state inserted in the edge part of the winding core C to show, and the upper half of the push cup 1 has shown the cross section.

  The gripping mechanism 5 is disposed at a plurality of positions in the circumferential direction of the push cup body 6 concentrically mounted on the tip end portion of the support shaft 2, and there is a height difference along the circumferential direction of the push cup body 6. An inclined surface 7 that is inclined to be generated, a movable body 8 that is arranged on each inclined surface 7, and a movable body 8 that holds the movable body 8 so that it can be moved along the inclined surface 7 while maintaining the same distance from each other. An annular retainer 9 that is concentrically attached to the cup body 6 and an expansion / contraction ring that is attached to the top 8a of the movable body 8 so as to collectively surround the movable body 8 and that can expand and contract in the radial direction. 10 and when the core C is not attached, the retainer 9 is pushed so that the movable body 8 moves to a higher portion of the inclined surface 7, so that the cup body 6 moves from a lower portion of the inclined surface 7 to a higher portion. Between the retainer 9 and the push cup body 6 that can be elastically biased. And a spring device 11 which is provided on.

  The push cup body 6 is fixed to the tip of the support shaft 2 with a bolt 12, and the support shaft 6 is rotatably held, and is indicated by an arrow A1 in FIG. 2 during winding by a winding drive means (not shown). It is rotationally driven in the direction.

  In this embodiment, the inclined surfaces 7 are provided at eight locations as shown in FIG. 2 and are formed by cutting so as to cross the outer peripheral surface of the front portion of the cylindrical push cup body 6. And the height of each part of the inclined surface 7 is the height with respect to the rotation center of the press cup main body 6, and the center part is the lowest and it becomes high gradually toward both ends. In this embodiment, the movable body 8 is composed of a roller that can roll on the inclined surface 8.

  As shown in FIG. 4, the annular cage 9 has accommodating portions 9 a that accommodate the movable bodies 8 at eight intervals in the circumferential direction at equal intervals. The accommodating portion 9a is formed by cutting a thickness portion from the inner peripheral surface to the outer peripheral surface of the front portion of the cage 9 from the end surface of the cage 9 to a predetermined depth with a width slightly larger than the diameter of the movable body 8. The movable body 8 formed and accommodated in the accommodating portion 9 a is movable in the radial direction of the retainer 9 with respect to the retainer 9.

  The movable body 8 is prevented from falling outward in the radial direction of the cage 9 by the expansion / contraction ring 10 shown in FIG. 1, and the movable body 8 is prevented from falling forward in the central axis direction of the cage 9. This is prevented by a cover 6b that is integrated with the front portion of 6 and constitutes the head 3. The cover 6b is fixed to the front surface of the push cup body 6 with bolts 6a shown in FIG.

  The expansion / contraction ring 10 is formed by cutting one place of a ring made of an elastic body such as a steel material in the radial direction so that the expansion / contraction ring 10 can be smoothly inserted into the inner peripheral surface of the core C. As shown in FIG. 1, the corner portion 10a between the front end surface and the outer peripheral surface of the expansion / contraction ring 10 is rounded. Further, in order to prevent the movable body 8 from falling off in the axial direction, the both ends of the inner periphery of the expansion / contraction ring 10 are respectively provided with downward stepped portions, and the distance between them is the length of the roller that is the movable body 8. Equivalent to. The expansion / contraction ring 10 may be formed by connecting a plurality of pieces in an annular shape by a resilient member such as a coil spring. The corner portion 10a between the front end face and the outer peripheral face of the expansion / contraction ring 10 may be chamfered. When it is necessary to increase the friction coefficient of the outer peripheral surface, an expansion / contraction ring in which a material having a high friction coefficient such as rubber is attached to the outer periphery may be used.

  Even if the pressing force to the end surface of the core C by the flange 4 of the pressing cup is large, the inner peripheral surface of the core C can be securely tightened so that the core C can be held concentrically with the cup body 1. In order to achieve this, the flange 4 includes a fixed rod 14 fixed to the press cup body 6 as shown in FIG. 1 and a rotating rod fixed to the rear portion of the cage 9 whose front surface is in contact with the end surface of the core C. 15 and a plurality of spheres 16 which bring the cage 9 and the fixing rod 14 into rolling contact with each other.

  When the cage 9 and the fixing rod 14 are in rolling contact with each other, the cage 9 can be easily rotated with respect to the push cup body 6 even when receiving a large thrust force from the core C. The rotational force can be reliably transmitted to the cage 9.

  In this embodiment, the fixing rod 14 and the rotating rod 15 are formed integrally with the pressing cup body 6 and the retainer 9 by cutting the material of the pressing cup body 6 and the retainer 9.

  The cage 9 has an inner peripheral surface whose inner diameter is slightly larger than the outer diameter of the outer peripheral surface of the push cup body 6. Further, a step portion 17 is provided on the inner periphery of the rear portion, and a large number of spheres 16 are accommodated in this step portion 17 as shown in FIG. The front surface of the fixed rod 14 and the end surface of the step portion 17 are in contact with each other through the large number of spheres 16, and at the same time, the outer peripheral surface of the push cup body 6 and the inner peripheral surface of the step portion 17 are in contact with each other. Therefore, since the thrust load and radial load received by the cage 9 are supported by the fixing rod 14 on the push cup body 6 via the large number of spheres 16, the durability against the thrust load is improved and the rotational resistance of the cage 9 is reduced. can do.

  As shown in FIG. 3, the spring device 11 includes four tension coil springs 20 provided between the retainer 9 and the push cup body 6, and each tension coil spring 20 has one end on the rear surface of the rotary rod 15. The other end is locked to the pin 19 fixed to the rear surface of the fixing rod 14.

  In the press cup 1 configured as described above, when the core C is not held, the tension coil spring 20 is contracted as shown by a solid line in FIG. 3, and the movable body 8 is engaged with the engaging surface as shown in FIG. 7, the expansion / contraction ring 10 is expanded in the radial direction. In order to hold the core C by the press cup 1, an axial forward force is applied to the press cup body 6, and the head 3 of the press cup 1 is moved to the hollow end of the core C as shown in FIG. Insert into. In order to release the core C from the push cup 1, the push cup main body 6 is retracted from the core C in the axial direction, and the head 3 is removed from the end of the core C.

  When the head 3 of the pressing cup 1 is inserted into the hollow end of the core C, the corner portion 10a between the end surface and the inner peripheral surface of the core C is joined to the corner portion between the front end surface and the outer peripheral surface of the expansion / contraction ring 10. When the corner portion 10a hits, the corner portion 10a is rounded and finished, so that the core C is guided by the corner portion 10a so as to be concentric with the expansion / contraction ring 10, and at the same time, the axial force of the core C is reduced. A part of the expansion / contraction ring 10 acts on the expansion / contraction ring 10 as an inward force in the radial direction of the expansion / contraction ring 10, that is, contraction force until the expansion / contraction ring 10 reaches an outer diameter that matches the inner diameter of the core C. It shrinks and fits on the inner peripheral surface of the core C. When the head 6 of the push cup is difficult to fit on the inner periphery of the core C, the core C or the push cup main body 6 is rotated in the direction in which the tension coil spring 20 is stretched or sufficiently rotated. The forward force in the axial direction may be applied to the push cup body 6.

  When the expansion / contraction ring 10 contracts inward in the radial direction, the movable bodies 8 move simultaneously toward the lower side of the inclined surface 7 by a distance corresponding to the contraction amount of the expansion / contraction ring 10, and the retainer 9 pushes the cup body 6. On the other hand, the spring device 11 rotates in a direction to advance from a high part to a low part of the inclined surface 7 against the urging force of the spring device 11. That is, in FIG. 2, it rotates in the direction indicated by the arrow A1. As the cage 9 rotates, the pin 18 indicated by the solid line in FIG. 3 moves away from the pin 19 and moves to the position indicated by reference numeral 18 ′, and the tension coil spring 20 is extended as indicated by the chain line.

  When the head 3 of the press cup has been inserted into the end of the core C, the movable body 8 has a larger inner diameter of the core C from the lowest portion to the higher portion of the inclined surface 7 as shown in FIG. The retainer 9 receives a rotational force in the direction opposite to the direction indicated by the arrow A1 with respect to the push cup body 6 from the spring device 11, and the retainer 9 moves the movable body 8 to the inclined surface 7. Trying to return to a higher part. Then, the expansion / contraction ring 10 is pushed up by each movable body 8 to return to a high part of the inclined surface 7 and tries to expand evenly, and the inside of the core C with a small pressing force according to the urging force by the spring device 11. The peripheral surface is pressed. Thereafter, when a rotational driving force is applied to the push cup main body 6 by starting winding, the core C and the expansion / contraction ring 10 are integrated with each other by frictional forces, and the push cup main body 6 is moved together with the movable body 8 and the retainer 9. And the movable body 8 moves toward a high portion of the inclined surface 7 and the expansion / contraction ring 10 expands, and the inner periphery of the core C is applied with a large pressing force corresponding to the rotational driving force received by the pressing cup body 6. Press the surface. When the winding is stopped, the pressing force of the inner peripheral surface of the core C by the expansion / contraction ring 10 becomes a small pressing force corresponding to the urging force by the spring device 11. Thereafter, when the head 3 is removed from the end of the core C, the retainer 9 is pushed by the urging force of the spring device 11 and rotates in the direction opposite to the direction indicated by the arrow A1 in FIG. The movable body 8 moves to the position shown in FIG.

  Therefore, even if the gripping mechanism 5 has a relatively large gap between the inner peripheral surface of the core C and the outer peripheral surface of the head 3 of the press cup, the hollow end of the core C When the head 2 is inserted into the core C, the inner peripheral surface of the core C is tightened with a small tightening force corresponding to the urging force of the spring device 11, thereby holding the core C concentrically with the cup body 6. Sufficient frictional force can be obtained so as not to cause a slip between the core C and the inner peripheral surface. During winding, the inner peripheral surface of the core C can be pressed and tightened with a large tightening force corresponding to the winding driving force, and the core C can be pressed and fixed securely to the cup body 1.

  7 and 8 show another embodiment of the present invention. The annular retainer 9 has a stepped portion 21 at the corner between the inner peripheral surface and the rear end surface, and the push cup body 6 has an outer peripheral surface on the rear side of the outer peripheral surface on which the retainer 9 is rotatably fitted. The spring device 11 includes a plurality of compression coil springs 22 and has a large-diameter portion 6 c having a larger outer diameter. Each compression coil spring 22 is accommodated in a row in a circumferential direction in a step portion 21 of the retainer 9 fitted to the outer peripheral surface of the push cup body 6, and one end of each compression coil spring 22 is placed in the push cup body 6. The other end of the compression coil spring 22 is engaged with the pin 24 fixed to the cage 9, and the pin 23 is fixed to the front end surface of the large-diameter portion 6 c. In the case of this embodiment, the core C is temporarily tightened with a small force by the action of the spring device 11 when it is inserted into the hollow end of the core C into the head 3 of the pressing cup, and axially directed to the core C. During winding, in which there is a risk of applying a large amount of force, the core C can be securely tightened with a large force according to the rotational driving force, so that the end surface of the core C for restraining the core C in the axial direction However, if necessary, the large-diameter portion 6c of the push cup main body 6 may be formed with a collar portion that engages with the end surface of the core C.

  According to the present invention, an annular retainer 9 as shown in FIGS. 9 and 10 may be provided instead of the retainer 9 and the expansion / contraction ring 10 shown in the above-described embodiment. The retainer 9 is attached to the push cup body 6 so as to be concentrically rotatable. The retainer 9 holds the movable body 8 so that the movable body 8 can move along the inclined surface 7 while maintaining an equal interval therebetween. The movable body 8 is capable of directly pressing the inner peripheral surface of the core C and holds the push cup main body 6 so as not to fall off in the radial direction. In this embodiment, the movable body 8 is a roller, and the end surface of the movable body 8 and the corner portion 10a of the outer peripheral surface are chamfered so that the head 3 of the press cup can be easily fitted to the inner peripheral surface of the core C. . The retainer 9 has an accommodating portion 9a for accommodating the movable body 8 arranged at equal intervals in the circumferential direction at the front portion thereof. In order to hold the movable body 8 so that the movable body 8 can move by a certain amount in the radial direction of the cage 9 and so that a part of the movable body 8 can protrude from the outer peripheral surface of the cage 9, The portion from the circumferential surface to the outer circumferential surface has a width slightly larger than the diameter of the movable body 8 at a certain height from the inner circumferential surface of the cage 9, and on the outer circumferential surface of the cage 9 or in the vicinity of the outer circumferential surface. The width of the movable body 8 is slightly smaller than the diameter of the movable body 8 and is cut out from the front end face of the cage 9 to a predetermined depth. Then, by holding the movable body 8 so as to be movable by a certain amount in the radial direction of the cage 9, the movable body 8 can move along the inclined surface 7, and the movable body 8 can be moved from the outer peripheral surface of the cage 9. By holding so that a part can protrude, the movable body 8 can directly press the inner peripheral surface of the core C.

  Further, if necessary, the push cup body may be rotatably attached to the tip end portion of the support shaft and receive a rotational driving force via the transmission, or may be formed by cutting the tip end portion of the support shaft. It may be a thing. The movable body may be a sphere that rolls on an inclined surface, or a movable body that slides on the inclined surface and moves to a lower portion and a higher portion. The spring device may be a single coil spring, or may use another spring or elastic member such as a spiral spring. In addition, a roller can be used in place of the sphere that rolls and contacts the fixing rod and the cage.

It is a side view of the push cup which concerns on one Example of this invention. FIG. 2 is a cross-sectional view showing a cross section taken along a cutting line AA in FIG. It is a rear view at the time of the core non-holding of the push cup shown in FIG. It is a perspective view of the holder | retainer shown in FIG. FIG. 2 is a cross-sectional view showing a cross section taken along a cutting line DD in FIG. It is sectional drawing which showed partially the cross section at the time of the core non-holding corresponding to the cross section shown in FIG. 2 of the pushing cup shown in FIG. It is a longitudinal cross-sectional view which shows the principal part of the push cup which concerns on the other Example of this invention. FIG. 8 is a cross-sectional view showing a cross section taken along the cutting line FF in FIG. It is a longitudinal cross-sectional view which shows the principal part of the push cup which concerns on another Example of this invention. 10 is a cross-sectional view showing a cross section taken along the cutting line H-H in FIG.

Explanation of symbols

C winding core 1 push cup 2 support shaft 3 head 4 flange 5 gripping mechanism 6 push cup main body 7 inclined surface 8 movable body 9 cage 10 expansion / contraction ring 10a square portion 11 spring device 12 bolt 14 fixed rod 15 rotating rod 16 sphere 17 Step 20 Coil spring

Claims (3)

  A push cup that is provided at the tip of a pair of support shafts that support the core from both sides in its longitudinal direction, and that holds and releases the end of the core, and is inserted into the hollow end of the core And a gripping mechanism that is provided on the head and can press and tighten the inner peripheral surface of the core, and the gripping mechanism is mounted or formed concentrically on the tip of the support shaft. Are arranged at equal intervals in at least three locations in the circumferential direction of the press cup, and are inclined so as to cause an elevation difference along the circumferential direction of the push cup body, and movable respectively disposed on the inclined surfaces. A body, and an annular retainer that is concentrically attached to the main body of the push cup and holds the movable body so that the movable body can be moved along the inclined surface while maintaining an equal distance from each other, and the movable body Radially mounted on the top of the movable body so as to surround the An expansion / contraction ring that can be expanded / contracted, and when the winding core is not mounted, the movable body moves to a portion having a high inclined surface so that the movable body moves to a portion having a high inclined surface. A push cup comprising: a spring device provided between a retainer and a push cup main body, which is elastically urged in the direction of moving to the right.   2. The push cup according to claim 1, wherein instead of the retainer and the expansion / contraction ring, the movable body is held so as to be movable along the inclined surface while maintaining an equal distance from each other, and the push cup body. A push cup provided with an annular cage concentrically attached to the push cup main body, the top of the movable body holding the inner peripheral surface of the core so as to be directly pressable, so that it cannot fall off in the radial direction of the core. . A hook for engaging with the end face of the core into which the head is inserted and restraining the core in the axial direction is provided, the hook including a fixing hook fixed to the push cup body, and the retainer 2. A rotating rod having a front surface abutting against an end surface of the core, and a plurality of spheres or rollers for rollingly contacting the retainer and the fixing rod. The push cup according to claim 2.

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