JPH071274Y2 - Paper tube cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an automatic paper tube cutting machine for automatically cutting a paper tube.

[Conventional technology]

A paper tube is used as a core of a roll of roll or the like, and such a core is manufactured by cutting a long paper tube as a raw material into predetermined lengths.

Conventionally, in the work of cutting a long paper tube, the movement and positioning of a cutter blade with respect to the paper tube to be processed, the pressurization of the blade and the judgment of completion of cutting are all manually performed, and a mandrel for supporting the paper tube during processing is used. Some of them rotate and some do not. In the case where the mandrel does not rotate, it is necessary to manually align the concave and convex portions of the concave-convex engaging portion for preventing the mandrel from rotating with respect to the machine body of the cutting machine.

[Problems to be solved by the device]

By the way, in the conventional work as described above, the positional accuracy regarding the horizontal movement positioning of the cutter blade is poor, the error of the cutting position is about ± 1 mm, and the workability is poor. Also, it is difficult to judge the completion of cutting with the cutter blade. And since the pressing of the cutter blade against the paper core is done manually, workability is poor,
In particular, with the type that uses a rotating mandrel, it is difficult to accurately detect the cutting completion time when the innermost circumference of the paper core cutting part is cut off, avoiding the situation where the blade edge is directly pressed against the outer circumference of the mandrel. Because it is difficult, the life of the cutter blade is short. On the other hand, in the case where the mandrel does not rotate, there is a problem in that workability is poor because it is necessary to preliminarily position a rotation preventing pin or the like.

The present invention intends to solve such a conventional problem, and aims to simplify and ensure the automation of paper tube cutting work, and also to improve the accuracy of paper tube cutting. To do.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a chuck device that holds one end of a paper tube, a rotary drive device that is connected to the chuck device through an automatic joint, and a mandrel that is supported by the chuck device through a bearing. , A paper tube rotation operation part comprising a mandrel rotation preventing device that engages and disengages with the mandrel with a concave-convex engagement part, and a cutter blade movement for positioning a cutter blade for cutting the paper tube along the paper tube rotation operation part A device, a cutter operating unit consisting of a cutter blade pressing device that presses the cutter blade against the paper tube under predetermined conditions, and the completion of cutting the paper tube is electrically connected by contact between the mandrel and the cutter blade. The gist of the present invention is a paper tube cutting machine having a detecting device for detecting.

Then, the convex portion of the concave-convex engaging portion may be a spring-loaded positioning pin.

[Action]

In the paper tube cutting machine of the present invention, in the paper tube rotation operation section, the chuck device holds the end of the paper tube, and the outer peripheral surface of the mandrel which is prevented from rotating is used as a guide surface to rotate the paper by the rotation driving device. Rotate the tube. On the other hand, in the cutter operating section, the cutter blade moving device feeds the cutter blade along the mandrel by a predetermined distance, and the cutter blade pressing device presses the cutter blade against the outer peripheral surface of the rotating paper tube at that position to cut. Then, the completion of cutting is electrically detected by the contact between the mandrel and the cutter blade, the cutter blade is returned, and the cutting work at that position is completed. Next, the cutter blade moving device repeats the operation of sending the cutter blade again by a predetermined distance and pressing it against the paper tube to cut it, thereby cutting the long paper tube into tubes having a predetermined length.

Also, in the case where the convex portion in the concave-convex engaging portion is a spring-loaded positioning pin, if the engaging position is not aligned initially, the mandrel will rotate with the paper tube because the positioning pin is pushed in. At the engaging position, the concave-convex engaging portion is engaged by the spring load force, and rotation of the mandrel is blocked.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall plan view of the cutting machine, and FIG. 2 is a side view thereof. As shown in these drawings, this paper tube cutting machine generally holds a mandrel 1 for inserting and supporting a paper tube W as a workpiece on its outer periphery and a paper tube W at one end thereof to rotate them. Paper tube rotation operation unit A including chuck device 2 and paper tube W
And a cutter operating portion B for pressing the cutter blade against the outer peripheral surface of the. The paper tube rotation operation unit A includes a spindle rotation drive device 4 attached to one end of the upper portion of the gantry 3 and a rotation blocking device 5 attached to the other end. The spindle rotation drive device 4 rotates a spindle. Motor 41 and spindle motor
A rotation main shaft 43 driven by a reduction gear 42 by 41 is provided, and a taper cone 51 that engages with an end of the mandrel 1 and supports one end of the rotation blocking device 5,
A pressure cylinder 52 for moving the tapered cone 51 in the axial direction is provided.

In this paper tube cutting machine, a chuck device 2 is connected to an end portion of a rotary spindle 43 via an Oldham coupling 6, and the chuck device 2 positions and clamps the end portion of the paper tube W to clamp the rotary spindle 43. The rotation force transmitting means for transmitting the rotation of the sheet to the paper tube W is configured.

FIG. 3 is a partially enlarged side view (partially shown in section) showing the details of the paper tube rotation operating section A, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. , The chuck device 2,
A flange portion 21 for positioning one end of the paper tube W, a joint connecting portion 22 and grip portions 23 arranged on both sides of the flange portion 21, and a shaft portion 24 provided at the tip of the grip portion 23 are provided. And
The grip portion 23 is formed with a plurality of notches 25 (three places in this example) provided at equal intervals in the circumferential direction along the axial direction, and the grip blades 26 made of a leaf spring material are formed in the notches 25. Are attached with screws. Grip blade 26
The grip edge is formed with saw blade-shaped irregularities, and the irregularities play a role of preventing slippage when the grip edge and the inner peripheral surface of the paper tube W are engaged and rotated. The grip blades 26 are attached so as to be inclined with respect to the radial direction in consideration of attachment / detachment of the paper tube W to / from the chuck device 2 and transmission of a rotational force from the chuck device 2 to the paper tube W. When the paper tube W is rotated in the direction shown by the solid line arrow in FIG. 4 for insertion and removal, the tip side of the grip blade 26 bends to facilitate insertion of the paper tube W and When the chuck device 2 is driven in the direction indicated by the dotted arrow, it serves to transmit the rotational force to the paper tube W. The structure of the grip portion 23 of the chuck device 2 is not limited to the above-mentioned structure, and any other suitable structure can be adopted.
For example, an air chuck or the like can be used.

Further, a small-diameter shaft portion at the tip of the grip portion 23 of the chuck device 2
One end of the mandrel 1 is supported on the ball 24 via a ball bearing 27.

On the other hand, the tapered cone 51 on the rotation blocking device 5 side is formed with an axial pin hole 53 opening at its tip end surface, and a positioning pin 54 is fitted in each pin hole 53. FIG. 5 is a perspective view showing the details of this portion. As shown in FIG. 5, the end surface of the taper cone 51 and the end surface of the mandrel 1 are on a circle of equal radius centering on their axes. A plurality of positioning pins 54 and the engaging holes 11 are arranged to face each other. As a matter of course, the outer peripheral conical surface 55 of the tapered cone 51 engages with the inner peripheral conical surface 12 formed inward from the end surface of the mandrel 1 to perform the function of centering the mandrel 1. Since the cylinder shaft of the pressurizing cylinder 52 is prevented from rotating by an appropriate means (for example, key and key groove, spline engagement, etc.) to prevent rotation, the taper cone 51 attached to the cylinder shaft is also blocked. In addition, it means that rotation is blocked.

FIG. 6 shows a modified example of the tapered cone 51. In this example, the pin hole 53a has a slightly larger diameter so that the positioning pin 54a can slide, and the positioning pin 54a is pinned in the hole. A pin pressure spring 56a, which is spring-loaded so as to be pushed out of the hole 53a, is housed. In the figure, reference numeral 57a indicates a retaining plate for the positioning pin 54a.

In contrast to such a configuration of the paper tube rotation operation unit A, the cutter operation unit B is composed of a cutter slide unit 7, a cutter unit 8 and a cutter feed mechanism 9, as shown in FIG. The cutter slide portion 7 has a pair of slide rails 71, both ends of which are supported by brackets and which extend in parallel along the mandrel 1. A feed screw shaft 91 is attached between the slide rails 71 so that both ends are rotatably supported by the bracket, and a blade feed servomotor 92 is attached to one end of the feed screw shaft 91. There is. Slide block that constitutes the cutter unit 8
The feed screw shaft 91 is connected to the feed screw shaft 91 by a ball screw, and is guided by the slide rail 71 by the rotation of the blade feed servomotor 92 to be movable.

FIG. 7 is a perspective view showing the details of the cutter operating portion B. As shown in FIG. 7, the cutter operating portion B is a cutter which repeatedly moves the cutter blade 84 along the mandrel 1 by a predetermined distance. Comprising blade moving means, one side of the slide block 81 is provided with a pressure fulcrum 82.
A blade holder 83 that swings around is provided, and a cutter blade 84 is attached to the tip thereof. The other end of the blade holder 83 is connected to the rod of the air cylinder 85, and the expansion and contraction of the air cylinder 85 causes the cutter blade 84 to move toward or away from the mandrel 1. More specifically, the blade feed servomotor 92 is connected to the feed screw shaft 91 via a coupling 93, and a rotary encoder via a belt 95 wound around a pulley 94 attached to the rotary shaft of the servomotor 92. The rotation is transmitted to 96. Of course, a rotary encoder
The output of 96 becomes a control signal of the operation panel and is used for the stop positioning of the slide block 81. Then, the blade feed control is performed with the end surface of the flange portion 21 for positioning one end of the paper tube W as the cutter blade origin.

In the present embodiment, although not shown, the cutter portion 8 and the paper tube rotation operation portion A are electrically insulated from each other, and a weak voltage is applied between them. The contact between the cutter blade 84 and the mandrel 1 can be detected and the contact between them can be confirmed. Then, this detection signal is used to detect the cutting completion timing in the operation described later. By the way, the detecting means may be other electric means such as measuring a resistance value.

Next, the operation of the paper tube cutting machine configured as described above will be described. First, in order to fit the paper tube W on the outer periphery of the mandrel 1, the pressurizing cylinder 52 is contracted to one end of the mandrel 1 prior to processing. And the positioning pin of the taper cone 51
Disengage via 54. In this state, the mandrel 1 can be opened about the connecting point of the Oldham's joint 6 with respect to the rotary main shaft 42 by a certain angle θ as shown in FIG. The tube W is fitted to the end of the flange portion 21 of the chuck device 2. At this time, when the paper tube W is pushed into the chuck device 2 while being rotated in the direction shown by the solid line arrow in FIG. 4, the grip blade 23 of the chuck device 2 bends and the diameter is reduced, so that the paper tube W can be inserted smoothly. In the figure, the dotted arrow indicates the rotation direction of the chuck device 2 when the rotary spindle is driven. Next, the mandrel 1 fitted with the paper tube W
To the original position, and the positions of the engaging hole 11 and the positioning pin 54 are adjusted by twisting the mandrel 1, and the pressure cylinder
Extend 52 and press the taper cone 51 against the end face of the mandrel 1.

By the way, in the case of the modification of the taper cone 51 shown in FIG. 6, the mandrel 1 is returned to the original position, and the pressurizing cylinder 52 is extended without aligning the positions of the engagement hole 11 and the positioning pin 54a, so that the taper cone Press 51a against the end face of mandrel 1. Then, the positioning pin 54a of the taper cone 51a is pushed into the pin hole 53a against the spring force of the pin pressure spring 56a, and the mandrel 1 and the taper cone 5
The inner and outer tapered surfaces 12, 55a of 1a abut each other to center the mandrel 1. In this state, even if the engagement between the tapered cone 51a and the mandrel 1 via the positioning pin 54a is not established, the engagement between the two is
When starting, the mandrel 1 is automatically established by a slight rotation around the axis.

When the setup is completed in this way, a series of automatic machining operations are then performed in the procedure shown in the flowchart of FIG. The input conditions in this flow are the supply paper tube dimension x, the paper tube cutting dimension y, and the paper tube cutting set number z,
These values are preset in the counter of the operation panel 10.

As shown in the chart, this flow is started by turning on the start button of the operation panel 10 with the left end of the paper tube as the cutter blade origin, and the detailed flow will not be described below. Follow to finish. The α movement in the flow is performed to eliminate the influence of the backlash of the ball screw portion on the position in the work advancing direction, and the contact between the cutter blade 84 and the mandrel 1 is kept for T seconds. With the cutter blade 84 and the mandrel 1 in contact with each other, rotate the paper tube W at least once,
This is to completely cut the innermost circumference.

In the modified example using the spring-loaded positioning pin 54a, the mandrel 1 slightly rotates around the axis at the time of starting the spindle motor, so that the tapered cone as described above.
A similar flow is followed except that the engaging operation between 51a and the mandrel 1 via the positioning pin 54a is automatically performed.

According to the above-described embodiments and modifications, the paper tube W can be automatically cut. However, at the time of cutting, the method of rotating only the paper tube W without rotating the mandrel 1 is adopted. As a result, the life of the cutter blade 84 can be significantly improved, and the completion of cutting the paper tube W is detected by the current flowing through the cutter blade 84 and the mandrel 1. This also contributes to the improvement of the life of the cutter blade 84, and the workability is improved because there is no need to repeat the operation in response to the incomplete cutting due to a human error. Also, there is no need for people to always be present. Further, in the modified example in which the mandrel 1 is fixed and the rotation is stopped by the spring-loaded pin 54a, it is not necessary to manually position the positioning pin 54a, and the setup time for machining can be reduced. it can.

The present invention has been described above in detail based on an embodiment, but the present invention is not limited to the above-mentioned embodiment, and various parts of various parts can be embodied within the scope of matters described in the scope of claims for utility model registration. Needless to say, it can be implemented by changing the physical structure. Some examples thereof have already been described in the above description.

[Effect of device]

According to the present invention described above, one end of the paper tube is held by the chuck device, and the rotation preventing device prevents the mandrel from rotating to rotate only the paper tube. Moreover, the cutter blade and the mandrel at the completion of cutting are adopted. Since the detection device that electrically detects the contact of is used to detect the completion of cutting the paper tube, it is possible to prevent damage to the cutter blade and significantly improve the life of the cutter blade. In addition, a cutter blade moving device for feeding and positioning the cutter blade along the mandrel by a predetermined distance and a cutter blade pressing device for pressing the blade on the paper tube at that position are provided to automatically cut the paper tube. Since it is possible to do it, work is easy,
Not only can the machining time be greatly reduced by automation, but the cutting precision can be improved.

And, in the one in which the convex portion in the concave-convex engaging portion of the mandrel and the rotation preventing device is the spring-loaded positioning pin, since the positioning pin and the engaging hole for the positioning pin are not aligned, the operation is simplified, The effect of improving workability is also obtained.

[Brief description of drawings]

FIG. 1 is an overall plan view of a cutting machine as an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a partially enlarged side view showing details of a paper tube rotating operation part in a partial cross section, Figure 4 shows
IV-IV arrow sectional view, FIG. 5 is a perspective view showing details of the engaging portion between the taper cone and the mandrel, FIG. 6 is a partially enlarged cross-sectional view showing a modified example of the taper cone, and FIG. 7 is a cutter. FIG. 8 is a perspective view showing details of the operation section, and FIG. 8 is a flowchart showing a processing operation of this apparatus. DESCRIPTION OF SYMBOLS 1 ... Mandrel, 2 ... Chuck device, 3 ... Stand, 4 ... Main shaft rotation drive device, 5 ... Rotation prevention device, 6 ... Oldham coupling, 7 ... Cutter slide part, 8 ... Cutter part, 9 ... Cutter feed mechanism, 10 ... Control panel, 11 ... Engagement hole, 12 ... Inner peripheral conical surface, 21 ... Flange part, 22 ... Joint connection part, 23 ... Grip part, 24 ... Shaft part, 25 ... Notch, 26 ... Grip blade, 27 ... Bearing , 41 ... Spindle motor, 42 ... Reducer, 43 ... Rotating spindle,
51,51a ... Tapered cone, 52 ... Pressure cylinder, 53,53a ...
Pin hole, 54, 54a ... Locating pin, 55, 55a ... Outer peripheral conical surface,
56a ... Pin pressure spring, 57a ... Prevention plate, 71 ... Slide rail, 81 ... Slide block, 82 ... Pressure fulcrum, 83 ...
Holder, 84 ... Cutter blade, 85 ... Air cylinder, 91 ... Feed screw shaft, 92 ... Blade feed servo motor, 93 ... Coupling, 94 ... Pulley, 95 ... Belt, 96 ... Rotary encoder, W ... Paper tube, A ... Paper tube rotation operation part, B ... Cutter operation part

Claims (2)

[Scope of utility model registration request] 1. A chuck device for holding one end of a paper tube, a rotary drive device connected to the chuck device via a universal joint, a mandrel supported by the chuck device via a bearing, and a concave-convex engagement with the mandrel. The rotation control device of the mandrel that engages and disengages at the section, the cutter blade moving device that moves and positions the cutter blade that cuts the paper tube along the paper tube rotation operation part, and the cutter blade. A cutter operating unit consisting of a cutter blade pressing device that presses the paper tube under predetermined conditions, and a detection device that electrically detects completion of cutting of the paper tube by contact between the mandrel and the cutter blade. A paper tube cutting machine that has. 2. The paper tube cutting machine according to claim 1, wherein the convex portion of the concave-convex engaging portion is a spring-loaded positioning pin.