JPS6214031Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a core fixing device for fixing a core for winding a web to a winding shaft.

Conventionally, when fixing the core to the winding shaft, an air expansion method has been used in which high pressure air is supplied between the two. Since this method requires high-pressure air, it is necessary to provide a special air source device.
In addition, a conduit must be provided to guide air between the core and the winding shaft. As described above, in the air expansion method, the structure of the device must be extremely complicated, which results in high costs. Furthermore, since air pressure must be supplied and removed each time the core is fixed or removed, the operations required for this are very troublesome, and the core cannot be easily fixed or removed.

Therefore, this invention aims to simplify the overall structure of a core fixing device for fixing a web winding core to a winding shaft, reduce its cost, and firmly, precisely, and reliably secure the core. A sleeve is fitted around the outer periphery of the winding shaft, a core is arranged on the outer periphery of the sleeve, and a circular groove formed on the outer periphery of the sleeve is fitted with a circular groove. A ring-shaped ring is formed in which an elastic ring is accommodated, each pin is inserted into a plurality of pin holes formed at angular intervals on the bottom surface of the groove, and the inner end of each pin is formed on the outer peripheral surface of the winding shaft. The elastic ring is fitted into the groove and pressed radially against the inner circumferential surface of the core by the pins, thereby fixing the core concentrically to the winding shaft, and further fixing the core to the winding shaft. A tapered guide surface for guiding the inner end of the pin is formed at the tip of the pin.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a winding shaft, 2 is a sleeve fitted on the outer periphery of the winding shaft, and 3 is a core arranged on the outer periphery of the sleeve 2. Reference numeral 4 denotes a circular groove formed on the outer periphery of the sleeve 2. 5 is a ring-shaped elastic ring of uniform thickness housed in the groove 2;
Reference numeral 6 denotes at least three or more pin holes formed radially on the bottom surface of the groove 2 at equal angular intervals. A plurality of pins 7 of the same length are inserted into each pin hole 6, and a head 8 formed at the outer end is accommodated in the groove 4 of the sleeve 2.
The inner end 9 is slightly protruded inward from the inner circumferential surface of the sleeve 2 and is fitted into a groove 10 formed in the outer circumferential surface of the winding shaft 1. Further, 11 is a tapered guide surface formed at the tip of the winding shaft 1, and is for guiding the inner end 9 of the pin 7. Reference numeral 12 denotes a flange formed on the sleeve 2 for positioning the core 3 in the axial direction.

In the core fixing device configured as described above, in order to fix the core 3 to the winding shaft 1, first insert the pin 7 into each pin hole 6 of the sleeve 2, and then tighten the head 8, as shown in FIG. Accommodate in group 4. The elastic ring 5 is then placed in the groove 4 of the sleeve 2 over the head 8 of each pin 7. This allows each pin 7 to be held within the pin hole 6.
Thereafter, as shown by the arrow (A), the core 3 is moved in the axial direction relative to the sleeve 2, and the core 3 is moved into the sleeve 2.
Place it around the outer periphery of the At this time, by bringing the end surface of the core 3 into contact with the flange 12 of the sleeve 2, the core 3 can be positioned with respect to the sleeve 2 in the axial direction. Next, as shown by the arrow (b),
Moving the sleeve 2 in the axial direction with respect to the winding shaft 1,
When fitted onto its outer periphery, the inner end 9 of each pin is guided by the tapered guide surface 11 of the winding shaft 1, and each pin 7 is displaced in the radial direction by the action of the tapered guide surface 11. Therefore, each pin 7 presses the elastic ring 5 against the inner peripheral surface of the core 3 in the radial direction. The elastic ring 5 is compressed between the head 8 of each pin 7 and the inner peripheral surface of the core 3, and is elastically deformed. Therefore, large friction occurs between the inner peripheral surfaces of the elastic ring 5 and the core 3. When the sleeve 2 is further moved in the axial direction, the inner end 9 of each pin 7 is fitted into the groove 10 of the winding shaft 1. The inner end 9 of each pin 7 is pressed and held against the groove 10 by the elasticity of the elastic ring 5. Thereby, the core 3 can be fixed to the winding shaft 1. The core 3 is restrained in the radial direction by the elasticity of the elastic ring 5, and is restrained in the axial direction by the friction of the elastic ring and the inner end 9 and groove 10 of each pin 7, and is completely fixed. Further, since each pin 7 has the same length and the elastic ring 5 has a uniform thickness, the core 3 is fixed concentrically to the winding shaft 1. Furthermore, since the elastic ring 5 is pressed against the inner circumferential surface of the core 3 in the radial direction, a clearance 13 is created between the core 3 and the sleeve 2, as shown in FIG.
This clearance 13 functions to absorb shrinkage and deformation of the core as the web is wound up.

To remove the core 3 from the winding shaft 1, move the sleeve 2 in the opposite direction to the winding shaft 1, and then remove the core 3 from the winding shaft 1.
The inner end 9 of the pin 7 may be removed from the groove 10. This allows the core 3 to be easily removed.

As explained above, according to this invention, when the sleeve 2 is moved in the axial direction and fitted onto the outer periphery of the winding shaft 1, the inner end of each pin 7 touches the tapered guide surface 11 of the winding shaft 1. The pin 7 slides along the tapered guide surface 11 and is displaced in the radial direction under the wedge action of the tapered guide surface 11. Therefore, each pin 7 expands the elastic ring 5, the elastic ring 5 is pressed against the inner circumferential surface of the core 3, is compressed between the pins 7 and the core 3, and is elastically deformed. Therefore, the core 3 can be fixed to the sleeve 2 and the winding shaft 1. Further, the inner end of each pin 7 is fitted into the groove 10 of the winding shaft 1, and the sleeve 2 and the winding shaft 1 are locked by each pin 7. Therefore, according to this idea,
The core 3 can be fixed and firmly fixed by the wedge action of the tapered guide surface 11 and the elasticity of the elastic ring 5. Furthermore, even if there is variation in the diameter of the core 3, the elastic ring 5 is elastically deformed accordingly, and the core 3 can be fixed accurately and reliably. Moreover, after fixing core 3,
The sleeve 2 and the winding shaft 1 are locked by the pin 7 and the groove 10, and there is no possibility that the sleeve 2 and the winding shaft 1 will move relative to each other in the axial direction. Therefore, there is no need to provide a special device for holding the sleeve 2 and the winding shaft 1 so that they do not move relative to each other in the axial direction, which simplifies the overall structure and reduces costs. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is an exploded sectional view of the winding shaft, sleeve, and core of FIG. 1. 1... Winding shaft, 2... Sleeve, 3... Core,
4... Groove, 5... Elastic ring, 6... Pin hole, 7... Pin, 8... Pin head, 9... Inner end of pin, 10... Groove, 11... Taper guide surface, 12 ...Flange, 13...Clearance.

Claims (1)

[Scope of utility model registration request] A core fixing device for fixing a core for winding a web to a winding shaft, the core fixing device includes a sleeve fitted around the outer periphery of the winding shaft, a core arranged around the outer periphery of the sleeve, and a ring formed on the outer periphery of the sleeve. A ring-shaped elastic ring is accommodated in a shaped groove, and pins are respectively inserted into a plurality of pin holes formed at angular intervals on the bottom surface of the groove, and the inner end of each pin is connected to the outer periphery of the winding shaft. Fit into the annular groove formed on the surface,
The elastic ring is pressed radially against the inner circumferential surface of the core by each of the pins, thereby fixing the core concentrically to the winding shaft, and furthermore, one of the pins is attached to the tip of the winding shaft. A winding core fixing device characterized by forming a tapered guide surface for guiding an inner end.