Paper tube mechanical clamp shaft

Abstract

We offer a paper tube clamp shaft that solves the problems of existing air-operated shafts, such as tube damage and wobble, and the problems of mechanical shafts, such as axial alignment of the paper tube. [Solution] Multiple parallel links of the same length are connected by pins via a center rod located between two upper and lower rods. The center rod is fixed in place by forming two parallelograms, one above the other, with the center rod as the axis, preventing vertical movement. When moved to the right, the two upper and lower rods cannot move horizontally, and the component force acting on the links causes the upper rod to move upward and the lower rod to move downward in parallel. This principle is used to transmit rotational force to the paper tube, resulting in a paper tube clamp shaft.

Description

Technical Field

[0001] The present invention relates to a paper tube clamping shaft used in devices such as film, paper making, printing, and fabric, which utilize a paper tube as a core for winding and feeding. A plurality of parallel links of the same length are connected by pins via a center rod located between two parallel rods, forming two parallelograms with the center rod as the axis. With a linear motion mechanism in which the two rods move parallel to each other according to the undulation of the links, the paper tube is clamped.

Background Art

[0002] As a conventional paper tube clamping mechanism, there is a rubber tube type. It consists of a holding shaft, a pipe shaft body, a claw block, a plate for holding the claw block, and a rubber tube. When air is injected into the rubber tube, the rubber tube inside the pipe shaft body expands, pushing up the claw block integrated with the expanded rubber tube and the plate for holding the claw block. The claw block is pushed out to the outside of the pipe shaft body to clamp the paper tube. The problems are that the rubber tube often breaks, and it takes time and effort to replace it, causing obstacles. Also, due to structural problems, since the rubber tube is used for clamping, the rubber tube cannot withstand the load of the paper tube. The pipe shaft body bears the load, resulting in a deviation between the center of the paper tube and the center of the pipe shaft body, and core deviation is a problem.

[0003] Mechanical shafts have also been commercialized. They consist of a pipe shaft body with holding shafts at both ends, a claw block, a center rod, and a slider. The center rod and slider are integrated, and when thrust is applied axially to the center rod, the axial movement of the claw block is restricted by the pipe shaft body. The contact bottom surface between the claw block and the slider is tapered, so when the center rod and slider move in the direction of thrust, the claw block is pushed outwards along the tapered surface from the pipe shaft body, creating a structure that clamps the paper tube. The center rod receives thrust from the axial direction via a wrench using a screw and nut provided at one end of the holding shaft of the pipe shaft body. Therefore, when the pipe shaft body is set on the holding shafts at both ends and the device drive unit, aligning the paper tube and the device axially is time-consuming and presents a challenge. [Overview of the project] [Problems that the invention aims to solve]

[0004] This invention solves the problems associated with existing air-operated shafts, such as damage caused by the tube and core runout, as well as the problems associated with mechanical shafts, such as axial alignment between the paper tube and the device. [Means for solving the problem]

[0005] This invention describes the operation of the parallel motion mechanism of the paper tube clamp shaft, in which links and rods are connected by pins. The basic configuration of the parallel movement mechanism based on a parallelogram, consisting of rods and links, is as follows: Multiple parallel links of the same length are connected by pins via a center rod located between two upper and lower rods, forming two upper and lower parallelograms with the center rod as the axis. The links are moved to the right from a 90-degree angle to the center rod until the two upper and lower rods contact the center rod. In this state, the two upper and lower rods that have been moved parallel to the right are fixed so that they cannot move from side to side but can slide up and down. The center rod is fixed so that it can slide to the right but cannot move up and down. When the center rod is moved to the right from this state, the two upper and lower rods cannot move from side to side, and the upper rod moves upward and the lower rod moves downward due to the component force acting on the links. This principle of parallel movement is applied to clamp the paper tube.

[0006] This invention describes the configuration of a paper tube clamp shaft using a parallelogram-based link and rod parallel movement mechanism. The paper tube clamp shaft consists of a main pipe as the base body, support fittings at both ends that transmit rotational force from the outside, and inside the main pipe, four rods that form four parallelograms radially from the square main shaft. These rods consist of a square center rod that serves as the core of the parallelogram-based link and rod parallel movement mechanism, from which multiple short links of the same length are connected by movable pins. Multiple short claw blocks are fixed at equal intervals to the faces of the four rods opposite the center rod, and these claw blocks protrude out of the main pipe through elongated holes drilled in the main pipe at the same intervals as the claw blocks. On the left side of the center rod is a jack consisting of a trapezoidal screw and nut to provide thrust to the center rod. The jack is integrated with one gear of a bevel gear within the support bracket on the left side of the main pipe, with the trapezoidal screw and nut attached. The other gear is set with a key on a shaft held perpendicularly by a bearing, and thrust is applied to the square main shaft jack by the rotational force of a wrench from the side of the main pipe.

[0007] This invention is a paper tube clamp shifter characterized by transmitting rotational force to a paper tube using a parallelogram-based mechanism of links and rods for parallel movement.

[0008] This invention relates to a paper tube clamp shaft characterized by its ability to generate a large force with a small force using a parallelogram-based link and rod parallel movement mechanism, thereby firmly clamping the paper tube.

[0009] The present invention is a paper tube clamp shaft characterized by applying thrust to a parallel movement mechanism from the side of the shaft using a bevel gear.

[0010] This invention relates to a paper tube clamp shaft characterized by a parallelogram-based link and rod parallel movement mechanism that allows all claw blocks to protrude evenly, resulting in the axis of the paper tube and the axis of the shaft being concentric and eliminating runout. [Effects of the Invention]

[0011] The effect of the present invention is to solve problems such as punctures and runout in existing rubber tube-type rubber tubes, and axial alignment issues in mechanical shafts. [Brief explanation of the drawing]

[0012] [Figure 1] Conceptual diagram of a link lever forming a parallelogram of a paper tube clamp shaft using a link and rod parallel movement mechanism during unclamping. [Figure 2] Conceptual diagram of a link lever forming a parallelogram of a paper tube clamp shaft using a link and rod parallel movement mechanism during clamping. [Figure 3] Vector diagram of force component P when thrust F is applied to the main shaft of a paper tube clamp shaft using a link and rod parallel movement mechanism. [Figure 4] Vector diagram showing the result of applying a small thrust F to the main shaft of a paper tube clamp shaft using a link and rod parallel movement mechanism to obtain a large component force P. [Figure 5]This vector diagram shows the state when the maximum force component P is obtained on the main shaft of a paper tube clamp shaft using a link and rod parallel movement mechanism, with a thrust F of zero. F is zero, indicating a state where the force is self-locking. [Figure 6] Diagram showing the overall structure of a paper tube clamp shaft using a link and rod parallel movement mechanism. [Figure 7] Detailed cross-sectional view of the paper tube unclamping mechanism on the side that applies thrust to the main shaft of a paper tube clamp shaft using a link and rod parallel movement mechanism. [Figure 8] Detailed cross-sectional view of the paper tube clamping mechanism on the side that applies thrust to the main shaft of a paper tube clamp using a link and rod parallel movement mechanism. [Figure 9] Detailed side cross-sectional view of the paper tube clamp shaft supporting the main shaft of the paper tube clamp shaft using a link and rod parallel movement mechanism during paper tube unclamping. [Figure 10] Detailed side cross-sectional view of the paper tube clamping mechanism on the side supporting the main shaft of a paper tube clamp shaft using a link and rod parallel movement mechanism. [Figure 11] Detailed cross-sectional view of the paper tube clamp shaft supporting the main shaft of the paper tube clamp shaft using a link and rod parallel movement mechanism during paper tube unclamping. [Figure 12] Detailed cross-sectional view of the paper tube clamping mechanism on the side supporting the main shaft of the paper tube clamp using a link and rod parallel movement mechanism.

[0013] The first embodiment of the present invention will be described below with reference to Figures 1, 2, 7, and 11. [Example 1]

[0014] The paper tube clamp shaft 1, based on the parallelogram shape of the paper tube clamp shaft and using a parallel movement mechanism of links and rods, has a main pipe 2 in which a center rod 5 with an axial rectangular cross-section and four side rods 7 are connected by multiple links 6 with movable pins 6-1, forming four parallelograms around the center rod 5. Claw blocks 8 with claws 8-1 attached to the opposite side of the side rods 7 from the center rod 5 are set at equal intervals with set screws 8-2. A buffer spring 9 is inserted between the claw blocks 8 and the center rod 5. Elongated holes corresponding to the claw blocks 8 are made in the main pipe 2. The claw blocks 8 are for clamping the paper tube 19 and have clearance to allow them to smoothly enter and exit the elongated holes. A trapezoidal screw 14 is connected to the left end of the center rod 5 with a trapezoidal screw connecting pin 14-1. A trapezoidal screw nut bearing 13-1 is inserted into the center of the support bracket 3, and a trapezoidal screw nut with a driven bevel gear 12 attached is mounted. Insert 13. Insert the drive shaft 10 with the drive-side bevel gear 11 key-fixed to the bearing 10-2 of the drive shaft housing 10-1 and set it on the side surface of the support fitting 3. Thus, the support fitting 3 equipped with a series of drive systems is completed. Insert the stopper plate (R) 15 into the main pipe 2 and rotate the trapezoidal screw nut 13 that is rotating while rotating the drive shaft 10 of the support fitting 3 equipped with a series of drive systems with a wrench to engage the trapezoidal screw 14 at the left end of the center rod 5, insert it into the main pipe 2, and fix it with the fixing screw 20. Insert the stopper plate 17 into the support fitting 4, insert the tip of the center rod 5 into the center hole of the stopper plate (L) 17, and fix the support fitting 4 to the main pipe 2 with the fixing screw 20. Thus, the assembly of the mechanical clamping shaft 1 is completed. When the drive shaft 10 is rotated clockwise, a thrust is applied to the center rod 5 by a jack composed of the drive-side bevel gear 11, the driven-side bevel gear 12, the trapezoidal screw nut 13, and the trapezoidal screw 14, and the link lever parallel movement mechanism functions, and the claw block 8 equipped with the claw 8-1 is pushed out of the main pipe 2. When the drive shaft 10 is rotated counterclockwise, conversely, the claw block 8 retracts. If the clamping shaft 1 is inserted into the paper tube 19 and the same operation is performed, the paper tube 19 can be clamped and unclamped, solving problems such as tube breakage, eccentricity, and axial centering of the existing air shaft and the mechanical type.

Example 2

[0015] Based on the parallelogram of the paper tube clamping shaft, the claws 8-1 and the claw block 8 of the paper tube clamping shaft using the parallel movement mechanism of the link and the rod were changed to rubber-based silicone rubber and implemented in the same manner as in Example 1. As a result, the same results as in Example 1 were obtained, and at the same time, no damage occurred at the contact part between the inner surface of the paper tube and the claws, and a favorable result of extending the life of the paper tube was obtained.

Explanation of Signs

[0016] 1 Mechanical clamping shaft 2 Main pipe 3 Support fitting 4 Support fitting 5 Center rod 6 links 6-1 Movable pin 7 Side Rods 8 Claw Blocks 8-1 Claw 8-2 Set Screws 9. Disc springs 10 Drive shaft 10-1 Drive shaft housing 10-2 Bearing 11 Drive-side bevel gear 12 Driven bevel gear 13 Trapezoidal screw nuts 13-1 Trapezoidal screw nut bearing 14 trapezoidal screws 14-1 Trapezoidal screw connection pin 15 Stopper Plate (L) 16 Stopper screw (L) 17 Stopper Plate (R) 18 Stopper screw (R) 19 Paper tube 20 Fixing screws

Claims

[Claim 1] A paper tube clamp shaft for use in film, papermaking, printing, and fabric rolling equipment that utilizes paper tubes as the core for winding and feeding, characterized in that multiple parallel links of the same length are connected by pins via a center rod located between two parallel rods, forming two parallelograms with the center rod as the axis, and the two rods move in parallel to each other according to the undulation of the links, thereby clamping the paper tube.

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