JP2000006091A - Tape cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape cutter capable of conducting conveyance and chucking of a work and fixing of a paper tube core metal with one actuator. SOLUTION: A tailstock spindle 4 slidable in the axial direction is fitted to the hollow part of a rotatable chucking main spindle. A chuck opening and closing cam 6 is mounted so as to slide on the outer-periphery surface of the chucking main spindle 1. The inclined edge of the chuck opening and closing cam 6 is connected, and a cam connecting pin 7 penetrating through the tailstock spindle 4 is fitted. A chuck claw 9 clamping the protruding part 16a of a paper tube 16 interlocking with the chuck opening and closing cam 6 is also fitted. The tailstock spindle 4 and a core metal rotating front end 15 mounted on the open end of a paper tube core metal 14 are engaged with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cutting device for cutting a work such as an adhesive tape wound wide on a long paper tube into a predetermined shape at a predetermined pitch, and in particular, the work can be rotated. The present invention relates to a tape cutting device having an improved chucking mechanism for supporting a tape.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 11, an adhesive tape or the like is formed in a roll shape in which a tape material 17 is wound a large number of times around a long paper tube 16 having a protruding portion 16a at an end. It is manufactured by forming a work W and cutting the roll-shaped work W into a ring shape at a predetermined pitch p.

Here, when cutting the work W, first, the paper tube 16 of the work W is attached to the cantilevered paper tube core that reciprocates in the axial direction, and the protrusion 16a is connected to the open end of the paper tube core. Insert so that it is on the side. Then, a chucking mechanism provided on the open end side of the core of the paper tube and rotatably supported at the open end of the core of the paper core along with a rotating end of the core metal rotatably supports the protruding portion 16a. The work W is cut while rotating the work on the outer peripheral surface of the core metal core.

Conventionally, as this kind of chucking mechanism, one shown in FIGS. 12 to 16 is known.
That is, in FIG. 12, a chucking main shaft 1 is rotatably supported by a main bearing housing 2, and a main shaft rotation drive pulley 3 is attached to the chucking main shaft 1. The spindle rotation drive pulley 3 is connected to a spindle motor (not shown) via a chain belt or the like.

[0005] At the front end side (right side in Fig. 12) of the chucking main shaft 1, there is provided a centering portion 30 formed such that a tapered portion 30a whose front end has a small diameter projects rightward. A substantially quadrangular pyramid-shaped cam 31 is slidably fitted on the outer peripheral surface of the chucking main shaft 1 via a cam rotation preventing key 32, and its end is an annular shape fixed to the main bearing housing 2. The air cylinder 33 is connected to a piston 34 via a thrust bearing 35. A spring 36 that pushes the cam 31 back to the initial position is stretched between a proper position inside the cam 31 and a proper position inside the chucking spindle 1. Further, a cam follower 8 that rotates on the inclined edge of the cam 31 is in contact with the inclined edge of the cam 31. The cam follower 8 includes a protruding portion 16 of a paper tube 16.
a is attached to the arm 9a of the chuck claw 9 for holding
The arm 9a is pivotally attached to a support member 1c fixed to the chucking main shaft 1 by a chuck rotating pin 10. Further, between the arm 9a and the chucking main shaft 1, a chuck return spring 11 that pushes the chuck pawl 9 back to the initial position is stretched.

On the other hand, a center hole 15a into which the tapered portion 30a of the core pushing portion 30 is removably fitted is provided at the core rotating end 15 provided rotatably at the open end of the paper core 14.
Has been established.

[0007] The conventional chucking mechanism having such a structure operates as described below. Here, FIG.
2 shows an initial state before chucking, and FIG. 13 shows a chucking state.

First, when the core 14 of the paper tube through which the work W is inserted is moved in the direction of the arrow in FIG. 12 by an air cylinder or the like (not shown), the work W is conveyed into the chucking area and is tapered into the center hole 15a. The part 30a is fitted. Then, a solenoid valve (not shown) is operated, and compressed air is sent to the annular air cylinder 33. Then, the piston 34 advances, and the cam 31 whose distal end is pressed by the piston 34 slides toward the paper core 14. Then, as the cam follower 8 rotates on the inclined edge of the cam 31, the arm 9a circularly moves in the direction of the center pushing portion 30 via the chuck rotating pin 10, and the chuck claw 9 is moved to the protruding portion 1.
6a is pinched (chucked). At this time, grasping of the protruding portion 16a by the chuck pawl 9 is achieved by a force for pushing the arm 9a generated by a force for pushing the cam 31 toward the paper core 14 by the pushing force of the piston 34.

When completion of chucking is confirmed by detecting means (not shown), a spindle motor (not shown)
Is driven, and the work W having the protruding portion 16 a sandwiched between the chuck pawl 9 and the core rotating end 15 rotates together with the chucking main shaft 1 on the outer peripheral surface of the paper tube core 14. At this time, the taper portion 30a fitted into the center hole 15a presses the core metal rotating tip 15 by the pressing force of the piston 34 and the urging force of the spring 36, thereby fixing the paper tube core 14 and cutting the workpiece. Core 14 by pressing force of blade
Is prevented from bending.

Next, when the completion of cutting is confirmed by detecting means (not shown), the chucking spindle 1
Is stopped, and the solenoid valve operates to release the air pressure to the annular air cylinder 33. Then, piston 3
Since there is no pressing by the spring 4, the cam 31 is pushed back to the initial position by the elastic force of the spring 36. This cam 31
With this movement, the cam follower 8 rotates in the opposite direction on the inclined edge, and by this rotation, the arm 9a circularly moves in the opposite direction to the core pushing portion 30 via the chuck rotation pin 10, and the chuck 9 rotates. The chuck claw 9 releases the protruding portion 16a by the elastic force of the return spring 11.

As described above, in the conventional chucking mechanism, an actuator (annular air cylinder 33) different from the actuator that moves the paper core 14 and conveys the workpiece W to the chucking area is used. The chucking of the protruding portion 16a and the fixing of the paper tube core 14 have been performed.

[0012]

However, the following problems have been pointed out in the apparatus utilizing the conventional chucking mechanism as described above. That is, the annular air cylinder 33 is attached to the chucking spindle.
Therefore, it is necessary to lengthen the chucking spindle 1 and its bearing portion (L in FIG. 13), and the apparatus has been increased in size. In addition to requiring a special air cylinder, a solenoid valve for switching compressed air, an air pipe, a thrust bearing 35 connecting the piston 34 and the cam 31, and the cam 31 rotating around the chucking main shaft 1. A key 32 for preventing rotation of the cam is required. Further, an actuator (an annular air cylinder 3) different from the actuator for moving the paper core 14 is used.
According to 3), the chucking of the protruding portion 16a is performed. Therefore, in order to detect the timing at which the chucking spindle 1 is rotated, detection means such as a sensor for confirming completion of chucking is required. Therefore, the number of parts has increased and the apparatus has been complicated. Further, in order to secure a space for providing a spring 36 for pushing back the cam 31, FIG.
As shown in FIGS. 4 to 16, the shapes of the cam 31 and the chucking main shaft 1 were complicated.

As described above, when the conventional chucking mechanism is used, the number of components is increased, and the size and size of the apparatus are increased. Therefore, parts such as bearings are easily damaged and broken, and the manufacturing process is complicated. Therefore, there is a problem that the manufacturing cost increases.

The present invention has been proposed to solve the problems of the prior art as described above, and its object is to improve the chucking mechanism and to use a single actuator,
By transporting the work W to the chucking area, chucking the paper tube protruding portion, and fixing the core of the paper tube, the number of components can be reduced, and the apparatus can be made compact and cost can be reduced.

It is another object of the present invention to provide a highly reliable device with a reduced number of failures, by simplifying the manufacturing process of the device by achieving the above object with a simple member and configuration.

[0016]

In order to achieve the above object, the present invention according to the first aspect of the present invention is directed to a long paper tube having a protruding portion at an end portion thereof and a tape material being repeatedly wound many times. The wound paper tube is inserted into a cantilevered paper tube core that reciprocates in the axial direction, and is provided at an open end of the paper tube core, and the paper tube core is opened. Through a chucking mechanism that rotatably supports the protruding portion together with a core metal rotating tip rotatably provided at an end, the workpiece is rotatably cut at a predetermined pitch while being rotated on the outer peripheral surface of the paper tube core. In a tape cutting device for cutting into a shape, the chucking mechanism is provided with a rotatable chucking main shaft, a centering shaft provided in a hollow portion of the chucking main shaft and slidable in the axial direction, and the centering shaft. And cooperate in the axial direction with the protruding part of the paper tube A paper core holding mechanism, and an elastic member for pushing the paper core holding mechanism back to an initial position. And the tailing shaft are configured to cooperate in the axial direction.

By taking such means, the tape cutting device according to the present invention operates as follows. That is, when the core of the paper tube through which the work is inserted is moved in the chucking main axis direction by, for example, an air cylinder, the work is transported together with the core of the paper tube into the chucking area. Then, the rotating end of the metal core provided at the tip of the core of the paper tube engages with the distal end of the core pressing shaft provided inside the chucking spindle, and the core pressing shaft cooperates with the core of the paper tube to chuck. It slides in the main shaft in the axial direction. Then, the paper tube holding mechanism cooperates with the tailing shaft in the axial direction, and holds the protruding portion of the paper tube.

By rotating the chucking spindle in this state, the paper tube holding mechanism rotates together with the core rotating end while holding the protruding portion of the paper tube, so that the work is placed on the outer peripheral surface of the core of the paper tube. Rotate. At this time, the paper tube clamping mechanism is urged in the paper core direction by the elastic member. That is, the core pushing shaft cooperating with the paper tube clamping mechanism is also urged in the direction of the core of the paper tube. Therefore, the core rotating shaft, which is engaged with the leading end of the shaft, and the core of the paper tube are pressed and fixed, so that the core of the core can be prevented from being bent by the pressing force of the blade when cutting the work.

Next, after the workpiece is cut, when the core of the paper tube is moved in the direction opposite to the chucking main shaft, the core metal rotating tip is separated from the tip of the core pushing shaft. Then, the paper tube holding mechanism is pushed back to the initial position by the elastic force of the elastic member, and operates in reverse to release the protrusion of the paper tube.
Then, the tailing shaft cooperating with the paper tube holding mechanism also returns to the initial position.

As described above, by using one actuator (for example, an air cylinder) for reciprocating the core of the paper tube, the work is conveyed into the chucking area, the protrusion of the paper tube is chucked, and the core of the paper tube is cored. Can be achieved.

According to a second aspect of the present invention, in the tape cutting device according to the first aspect, the elastic member includes an end of the paper tube clamping mechanism opposite to the core of the paper tube and a main shaft of the chucking spindle. It is characterized by being stretched between the outer peripheral surface and an appropriate place.

By adopting such means, the paper core holding mechanism and the chucking main shaft are formed in a simpler shape than when the elastic member is provided inside the paper core holding mechanism and the chucking main shaft. be able to.

According to a third aspect of the present invention, in the tape cutting device according to the first or second aspect, the paper tube clamping mechanism is fitted to the chucking main shaft so as to be slidable on the outer peripheral surface thereof in the axial direction. A conical-tube-shaped chuck opening / closing cam, a cam connecting pin that connects the inclined edge of the chuck opening / closing cam, and penetrates the tail pushing shaft, and the cam connecting pin can slide in the axial direction of the chucking main shaft. The chucking main shaft is provided with an elongated hole, and a holding member that supports the protrusion of the paper tube so as to be able to be inserted and removed in association with the axial reciprocation of the chuck opening / closing cam. It is characterized by the following.

By taking such means, the tape cutting device according to the present invention operates as follows. That is, when the tailing shaft slides in the axial direction as described above,
The cam connecting pin slides in the axial direction of the elongated hole of the chucking main shaft together with the centering shaft. With the movement of the cam connecting pin, the chuck opening / closing cam also slides on the outer peripheral surface of the chucking main shaft, and the holding member interlocking with the chuck opening / closing cam is
Hold the protruding part of the paper tube. In this state, as the chucking spindle rotates, the chuck opening / closing cam, the cam connecting pin, and the holding member rotate integrally with the chucking spindle. At this time, the cam connecting pin also has a function of preventing the chuck opening / closing cam from rotating around the chucking main shaft.

Next, after the workpiece is cut, when the core of the paper tube is moved in the direction opposite to the chucking main shaft, the core metal rotating tip is separated from the tip of the core pushing shaft. Then, the chuck opening / closing cam is pushed back to the initial position by the elastic force of the elastic member, and accordingly, the cam connecting pin, and eventually the lead shaft, also return to the initial position. The holding member releases the paper tube in conjunction with the movement of the chuck opening / closing cam.

As described above, with a simple configuration using the cam mechanism and the cam connecting pin, a chucking mechanism interlocked with the reciprocation of the core of the paper tube can be achieved.

According to a fourth aspect of the present invention, in the tape cutting device according to the third aspect, a portion of the cam connecting pin which is in contact with a surface in a longitudinal direction of the long hole is formed as a flat surface. And

By adopting such means, the contact area between the cam connecting pin and the surface of the elongated hole in the longitudinal direction can be made larger than that of the columnar one, so that the movement of the cam connecting pin is more stable. I do. Further, since the holding force of the lubricant is high, the movement of the cam connecting pin can be made smooth. Further, the load capacity of the cam connecting pin can be increased, rattling due to wear can be prevented, and the durability of the cam connecting pin and the chucking spindle can be improved.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In addition,
The same members as those in the related art shown in FIGS. 11 to 16 are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 10A and 10B are diagrams illustrating a schematic configuration of a tape cutting device using the chucking mechanism of the present invention, wherein FIG. 10A is a plan view, FIG. 10B is a front view, and FIG. FIG. In this apparatus, the cantilevered paper core 14 has two cores.
The core metal core 1 is provided alternately through the core metal reversing shaft 20.
The workpiece W is cut by reversing 4. On the open end side (right side in FIGS. 10A and 10B) of the paper core 14, a chucking main shaft portion serving as the center of the chucking mechanism is provided. On the other side, a paper core 1
An air cylinder 21 for reciprocating the shaft 4 in the axial direction is provided. The workpiece W is cut by moving the tool rest 22 sideways from the opposite side of the chucking spindle 1 at the pitch p in the axial direction of the paper core 14 and moving the tool 23 in and out of the workpiece W. It is configured to:

Next, the chucking mechanism in the present embodiment will be described. First, as shown in FIG. 1, the chucking spindle in FIG. 10 has a chucking spindle 1 having a large-diameter tip 1a on the right side rotatably supported by a main bearing housing 2. , A main shaft rotation drive pulley 3 is attached.
The spindle rotation drive pulley 3 is connected to a spindle motor (not shown) via a chain belt or the like.

In a hollow portion of the chucking main shaft 1, a tailing shaft 4 is provided so as to be slidable in the axial direction, and its leading end side (FIG. 1).
(Right side in FIG. 3) is configured to project with a tapered shaft portion 4a having a smaller diameter toward the tip. In addition,
A metal bush 5 is attached to the chucking main shaft 1 at a portion where the chucking main shaft 1 comes into contact with the tailing shaft 4. This is to smooth the sliding of the tailstock shaft 4, prevent the abrasion of the chucking main shaft 1 and the tailstock shaft 4, and improve the durability of the parts.

A conical cylindrical chuck opening / closing cam 6 having a small diameter toward the left in FIG. 1 is slidably fitted on the outer peripheral surface of the chucking main shaft 1. A cam connecting pin 7 that connects the center of the inclined edge of the chuck opening / closing cam 6 so as to be orthogonal to the axis and penetrates the tail pushing shaft 4 is fixed by a screw 7a (see FIGS. 5 and 9). ). Also,
As shown in FIG. 4, the chucking spindle 1 has a slot 1b penetrated therethrough so that the cam connecting pin 7 can slide in the axial direction.
Is provided.

Here, the cam connecting pin 7 has a function of causing the lead shaft 4 and the chuck opening / closing cam 6 to cooperate. That is, when the lead shaft 4 slides, the cam connecting pin 7 slides in the elongated hole 1b integrally with the lead shaft 4, and the chuck opening / closing cam 6 coupled to the cam connecting pin 7 also moves in the same direction. It is configured to slide. The cam connecting pin 7 also has a function of preventing the chuck opening / closing cam 6 from rotating around the chucking main shaft 1. Therefore, the cam detent key 32 in the above-described conventional example is unnecessary (see FIG. 12).

A cam follower 8 that rotates on an inclined edge thereof contacts the chuck opening / closing cam 6. The cam follower 8 is provided with an arm 9a of a chuck claw 9 for holding the protruding portion 16a of the paper tube 16, and this arm 9a
Is attached to the supporting member 1c fixed to the chucking spindle 1.
It is pivotally connected by a chuck rotating pin 10. The tip 9b of the chuck claw 9 is formed in an arc shape in accordance with the shape of a core metal rotating tip 15 described later (see FIG. 7) so that the protrusion 16a of the paper tube 16 can be firmly grasped. A chuck return spring 11 that pushes the chuck pawl 9 back to the initial position is stretched between the arm 9a and the tip 1a of the chucking spindle 1.

Here, the chuck claw 9 is configured to pinch the protrusion 16a of the paper tube 16 in conjunction with the reciprocating movement of the chuck opening / closing cam 6. That is, when the chuck opening / closing cam 6 moves to the left in FIG. 1, the cam follower 8 rotates clockwise on the inclined edge of the chuck opening / closing cam 6. Along with this movement, the arm 9a makes an arc movement in the direction of the centering shaft 4 via the chuck rotation pin 10, and the chuck claw 9 clamps the protruding portion 16a. When the chuck opening / closing cam 6 moves rightward in FIG. 2, the cam follower 8 moves.
Rotates the inclined edge of the chuck opening / closing cam 6 counterclockwise. Along with this movement, the arm 9a makes an arc movement in the direction opposite to the centering shaft 4 via the chuck rotation pin 10, and the resilient force of the chuck return spring 11 causes the chuck pawl 9 to release the projecting portion 16a. The cam follower 8, the chuck pawl 9, the chuck rotation pin 10, and the chuck return spring 11 correspond to a holding member described in claim 3.

Also, between the end (left side in FIG. 1) of the chuck opening / closing cam 6 and an appropriate position on the outer peripheral surface of the chucking spindle 1, specifically, a spring receiver 1 d provided near the main bearing housing 2. A cam return spring 12, which is an elastic member, is stretched. As described above, the cam return spring 12 is provided outside the chucking main shaft 1 and the chuck opening / closing cam 6. Therefore, as shown in FIGS. 5 and 6, the chucking main shaft 1 and the chuck opening / closing cam 6 have a simple shape as compared with the case where they are provided inside as in the above-mentioned conventional example (see FIGS. 14 to 16). Can be formed.

The cam connecting pin 7 has a flat surface at a portion which comes into contact with the surface of the elongated hole 1b in the longitudinal direction (FIG. 4, FIG. 4).
8 and 9). Note that the cam connecting pin 7 is
The cam follower 8 is provided at a position deviated from the rotation surface of the cam follower 8 as shown in FIG. This is to prevent the movement of the cam follower 8 from being hindered by the step 6a of the connecting portion.

Between the end (the left side in FIG. 1) of the tailing shaft 4 and the hollow end (the left side in FIG. 1) of the chucking main shaft 1, the tailing shaft is returned to the initial position. A spring 13 is stretched. The tailing shaft 4 is
As described above, since the chuck opening / closing cam 6 is cooperated with the chuck opening / closing cam 6 via the cam connecting pin 7, when the chuck opening / closing cam 6 is pushed back by the cam return spring 12, the lead shaft 4 is simultaneously pushed back. Therefore, the lead shaft return spring 13 is
The cam return spring 12 is supplemented.

On the other hand, a core shaft rotating tip 15 is rotatably attached to the open end of the paper tube core 14, and the tapered shaft portion 4a of the core pushing shaft 4 is removably fitted to the tip. A center hole 15a is opened. In addition, the tapered shaft portion 4a of the tailing shaft 4 corresponds to the tip of the tailing shaft 4 described in claim 1, and the tapered shaft portion 4a corresponds to the core metal rotating tip 15.
By fitting into the center hole 15a opened in
The paper core 14 and the core pushing shaft 4 are configured to cooperate in the axial direction.

The tape cutting device of the present embodiment having such a configuration operates as described below. First,
In FIG. 10 (B), the work W is inserted from the open end of the lower paper core 14 so that the protruding portion 16a is on the metal core rotation tip 15 side, and the work W is rotated by the core metal reversing shaft 20. The inserted paper tube core 14 is turned over to stand by. At this time, the chucking main shaft portion, the paper tube core 14, the core rotating tip 15, and the workpiece W have a positional relationship shown in FIG.

Next, the main operation panel 24 is operated, and the paper core 14 is chucked by the air cylinder 21.
When the workpiece W is moved in the direction, the work W is transported in the direction of the arrow in FIG.

When the work W is conveyed into the chucking area, the tapered shaft portion 4a of the core pushing shaft 4 is fitted into the center hole 15a of the core metal rotating tip 15, and the core pushing shaft 4 is attached to the paper. The main bearing housing 2 is pushed by the tube core 14.
Slide in the direction. At the same time, the cam connecting pin 7 penetrating the lead shaft 4 slides in the elongated hole 1b of the chucking main shaft 1 in the same direction. With the movement of the cam connecting pin 7, the chuck opening / closing cam 6 slides in the same direction, and the cam follower 8 rotates clockwise on the inclined edge of the chuck opening / closing cam 6. Due to this rotating action, the arm 9a makes an arc movement in the direction of the core pushing shaft 4 via the chuck rotating pin 10, and the chuck pawl 9 holds the projecting portion 16a as shown in FIG. On this occasion,
The protrusion 16a is grasped by the chuck claw 9 by a force for pulling the arm 9a generated by a force for pushing the chuck opening / closing cam 6 in a direction opposite to the paper tube core 14. Accordingly, the clearance around the chuck rotation pin 10 can be absorbed even under vibration during rotation, as compared with the case where the arm 9a is pushed as in the conventional example described above, so that the gripping force is stabilized.

In this state, a spindle motor (not shown) is driven, and the workpiece W having the protruding portion 16a sandwiched between the chuck pawl 9 and the core rotating end 15 together with the chucking spindle 1 is moved to the paper tube core 14. It rotates on the outer peripheral surface of. At this time, the chuck opening / closing cam 6 and the core pushing shaft 4 are urged toward the paper core 14 by the cam return spring 12 and the core pushing shaft return spring 13, respectively. Therefore, the paper tube core 14
Can be pressed and fixed, and the bending of the paper core 14 due to the pressing force of the blade 23 at the time of cutting the work can be prevented.

Next, when it is confirmed by the detecting means (not shown) that the cutting has been completed, the chucking spindle 1
Is stopped, and the core of the paper tube 14 is fixed to the chucking spindle 1.
As a result, the tapered shaft portion 4a is separated from the center hole 15a. And the cam return spring 12
The chuck opening / closing cam 6 and the lead shaft 4 are pushed back to the initial position by the repulsive force of the lead shaft return spring 13.
With the movement of the chuck opening / closing cam 6, the cam follower 8 rotates counterclockwise on the inclined edge of the chuck opening / closing cam 6, and the arm 9a is rotated by the rotating action of the cam follower 8 and the elastic force of the chuck return spring 11. Makes a circular motion in the direction opposite to the tailing shaft 4, and the chuck pawl 9 releases the protrusion 16a.

The present invention is not limited to the above-described embodiment, but can be implemented with appropriate modifications without departing from the scope of the invention.

[0047]

As described above, according to the present invention, one actuator for moving the core of the paper tube can be used.
The transfer of the work, the chucking of the work, and the fixing of the core of the paper tube can be performed. Therefore, the number of parts can be reduced, and the apparatus can be made compact and cost can be reduced.

Further, since the apparatus is constituted by simple members utilizing a cam mechanism and a cam connecting pin, the manufacturing process of the apparatus is greatly simplified, and a highly reliable apparatus with few failures can be provided. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an initial state of a chucking mechanism according to an embodiment of an apparatus according to the present invention;

FIG. 2 is a longitudinal sectional view showing a chucking state of a chucking mechanism according to an embodiment of the apparatus according to the present invention;

FIG. 3 is a plan view showing a chucking state of a chucking mechanism according to an embodiment of the apparatus according to the present invention;

FIG. 4 is a cross-sectional view showing only the chucking spindle and the cam connecting pin of FIG. 3;

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a sectional view taken along line BB of FIG. 3;

FIG. 7 is a view in the direction of arrow C showing the chucking main shaft portion of FIG. 2;

FIG. 8 is a perspective view showing an example of a cam connecting pin of the embodiment of the device according to the present invention.

9 is a partially enlarged cross-sectional view showing a connection state between the cam connecting pin and the chuck opening / closing cam in FIG. 5;

FIG. 10 is a view showing a schematic configuration of an example of an embodiment of the apparatus according to the present invention, wherein (A) is a plan view, (B) is a front view, and (C) is a right side view.

FIG. 11 is a sectional view illustrating a workpiece.

FIG. 12 is a longitudinal sectional view showing an initial state of a conventional chucking mechanism.

FIG. 13 is a longitudinal sectional view showing a chucking state of a conventional chucking mechanism.

FIG. 14 is a diagram illustrating the shape of a cam in FIG.
D line sectional view

FIG. 15 is a view in the direction of arrow F for showing the shape of the cam in FIG. 14;

FIG. 16 is a view in the direction of arrow E showing the chucking main shaft portion of FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chucking main shaft 1b Slot 2 Main bearing housing 3 Main shaft rotation drive pulley 4 Core pushing shaft 4a Tapered shaft part 5 Metal bush 6 Chuck opening / closing cam 7 Cam connection pin 8 Cam follower 9 Chuck claw 10 Chuck rotation pin 11 Chuck return spring 12 Cam return Spring 13 Core pushing axis return spring 14 Core of core tube 15 Rotating tip of core core 15a Center hole 16 Core tube 16a Projection 17 Tape material 21 Air cylinder W Work 1

Claims (4)

[Claims] 1. A cantilevered paper tube core that reciprocates in the axial direction on a paper tube of a work in which a tape material is wound a number of times on a long paper tube having a protruding portion at an end thereof. , And rotatably supports the protruding portion together with a core rotating end provided at the open end of the paper core and rotatably disposed at the open end of the paper core. A tape cutting device that cuts the workpiece in a ring shape at a predetermined pitch while rotating the work on the outer peripheral surface of the paper tube core via a mechanism, wherein the chucking mechanism comprises a rotatable chucking spindle; A tailing shaft provided in the hollow portion of the chucking main shaft and slidable in the axial direction, and a paper tube holding mechanism that cooperates with the tailing shaft in the axial direction and cuts out the protrusion of the paper tube. And an elastic member for pushing the paper tube holding mechanism back to the initial position. In addition, the core core rotating shaft and the core pushing shaft are configured to cooperate in the axial direction by engaging the leading end of the core pushing shaft with the tip of the core pushing shaft. Tape cutting device. 2. The apparatus according to claim 1, wherein the elastic member is stretched between an end of the paper tube clamping mechanism opposite to the core of the paper tube and an appropriate position on an outer peripheral surface of the chucking spindle. The tape cutting device according to claim 1, which performs the cutting. 3. A conical cylindrical chuck opening / closing cam fitted to the chucking main shaft so as to be slidable in the axial direction, and a tapered edge of the chuck opening / closing cam. A cam connecting pin connected to and penetrating the tail pushing shaft; an elongated hole provided in the chucking main shaft so that the cam connecting pin can slide in the axial direction of the chucking main shaft; The tape cutting device according to claim 1, further comprising: a holding member that supports the protrusion of the paper tube so as to be able to squeeze and interlock with the reciprocation in the axial direction. 4. The tape cutting device according to claim 3, wherein a portion of the cam connecting pin that comes into contact with a surface in a longitudinal direction of the elongated hole is formed as a flat surface.