JPS597599A - Cutter for paper pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to a paper tube cutting machine.

Some conventional paper tube cutting machines cut the paper tube by fitting the paper tube outside of the metal shaft and rotating the rotatably supported circular blade against the paper tube. When the body reaches the shaft, it wears out extremely quickly. Therefore, the cutting time for each paper tube is automatically regulated by a timer, but at least the cutting time gradually increases as the blade wears out each time it reaches the shaft. Therefore, it has low practicality. Although it is also done to prevent the blade from being closer to the shaft than a certain level, slight discrepancies in the diameter of the shaft may result in the paper tube not being completely cut through one cutting operation or another. There is a drawback. Due to these points, it has been difficult to automatically cut the paper tube.

The present invention solves the above problems and provides a paper tube cutting machine which can be used for completely automatic cutting of paper tubes by minimizing the wear of the blade body.

An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the invention shown in the figure, 10 is a main body. Reference numeral 11 denotes a shaft which is rotated in a predetermined direction by an electric motor (not shown), into which a paper tube 90 is fitted from the tip 12, held by a chuck 13, and rotated at the same time. This shaft is made of hardened steel and is hollow except for both ends. Reference numeral 14 denotes a bearing member, which is always in the position shown by the solid line in FIG. When the paper tube 90 has been completely cut, it returns to the position shown by the solid line and the cut product 91 can be removed.

Reference numeral 15 denotes a cutting device, which is constructed as described below. That is, reference numeral 16 denotes a support base that engages with a guide member 17 attached to the main body 10 and is supported so as to be movable in the lateral direction. 1
Reference numeral 8 denotes a ball screw that can be driven at high and low speeds by two electric motors (not shown) via clutch brakes, respectively, and is a female screw member 20 provided on the support base 16.
They are screwed together via a ball (not shown). Reference numeral 21 denotes an encoder that emits a signal every predetermined rotation angle of the ball screw. For example, when the ball screw rotates once, the support base 16 moves 19 mm, and the encoder 21 emits a signal 100 times during that time.

An air cylinder 23 is tiltably supported by a pair of bottles 25 with respect to the support base 16, and is adapted to operate the piston 26 by receiving compressed air from a hose (not shown). Reference numeral 27 denotes a circular blade body attached to a mounting shaft 28, and the peripheral edge thereof is a blade portion 29. A movable member 30 rotatably supports the mounting shaft 28, and is rotatably connected to the support base 16 by a shaft 31. A bushing 32 made of an insulating material is connected to the peripheral surface of the shaft 31. A pair of annular members 33 made of an insulating material are arranged to contact both ends of the bushing. Reference numeral 35 denotes a connecting member made of an insulating material provided at the outer end of the piston 26, and is connected to the movable member 30 by a pin 36. Therefore, the movable member 30 is completely insulated from the support base 16. Reference numeral 37 denotes an insulated conductive wire connected to the movable member 30, which is connected to the control panel 3 so that it does not cause any problem even if the support base 16 moves together with the hose of the air cylinder 23.
It is intended to reach within 8. A slight DC voltage is applied between the movable member 30 and the main body 10 from within this control panel, and the blade 27 is connected to the main shaft 1
1, a weak current will flow. paper tube 9
When the air cylinder 23 operates and the piston 26 protrudes while the shaft 11 holding 0 is rotating in the direction of the arrow in FIG.
The paper tube is cut by the blade part 29 while rolling in the direction of the arrow in FIG. After a short predetermined time after detection, a relay (not shown) operates to issue a signal to return the piston 26, thereby completing one disconnection.

Reference numeral 40 denotes a pair of polishing members, such as grindstones, which are attached to attachment members 41 that are rotatably attached to the movable member 30 by the bins 42, respectively, and the blade body 27 receives the elasticity of a helical spring 43. It contacts the blade portion 29 from both sides and automatically grinds when the blade body 27 rotates. Reference numeral 45 denotes a cylindrical body that accommodates liquid paraffin provided in the movable member 30, soaks it into felt (not shown), and attaches it to both sides of the blade body 27. By doing this, the cut surface of the paper tube 90 is coated with paraffin and becomes smooth. Conventionally, solid paraffin was pressed against the blade body 27, but this step can be omitted.

46 is a digital setting section provided in the control panel 38, and a paper tube 90
can be set to cut into predetermined lengths. 47 is a digital switch for setting this cutting width, for example, Q, l.
Any length can be set with min precision. 48 is another digital switch, which is set to a somewhat smaller length than the digital switch 47, and within that range, the ball screw 18 is driven by a high-speed electric motor, and thereafter is driven by a low-speed electric motor, and when a stop signal is received. It can be stopped immediately. 5o is a display section, and when the ball screw 18 starts rotating, the encoder 2
According to the signal from 1, the moving length that increases every time the support base 16 moves by 0.1 mm is displayed. When the numerical value on the display reaches the value set in the digital switch 47, the rotation of the ball screw 18 is stopped and the displayed numerical value returns to zero.

51 is a start switch. Further, when the cutting is completed, the support stand 16 comes to the right end position shown in FIG. 1 and stops. Insert the paper tube 90 into the shaft 11 and chuck 1
3 and the digital switches 47 and 48 are set, and when the start switch 51 is pressed, the bearing member 15 supports the tip 12 of the shaft 11 and the shaft 11
starts rotating. At the same time as the cutting shaft rotates, a cutting signal is issued, the air cylinder 23 operates, and the blade 27 cuts the paper tube 90 at the position shown by 01 in FIG. 1, and the blade 27
When the ball screw 18 starts its return movement and reaches a predetermined position, the ball screw 18 starts rotating and the support base 1G moves to the left in FIG. At the same time, a cutting signal is issued again, and the same operation is repeated to perform cutting at positions such as C2 and C3. Therefore, products 91 having a predetermined length are sequentially obtained after this second cutting. When the support base 16 reaches near the left end, the ball screw 18 stops rotating and then starts rotating in the opposite direction, and the shaft 11
rotation stops, the bearing member 14 rotates, and the tip 12 of the shaft 11 is opened. When the support base 16 reaches the initial position, the ball screw 18 stops and the start switch 51 is activated.
will return. In this state, the product 91 can be pulled out, and the next paper tube 90 can be inserted again and cut in the same manner.

As described above, this invention detects that a weak current flows between the blade body 27 and the shaft 11, and then issues a cutting completion signal to separate the blade body 27 from the shaft 11. The blade body 27 only needs to be in contact with the shaft 11 for the minimum amount of time necessary, so that its wear can be minimized, and the paper tube 90
This has the effect that even if the thickness of the pipe wall is different, it can be cut reliably, and it can be used for automatic cutting such as using the digital setting section 46.

Incidentally, in this invention, the abrasive member 4o for polishing the blade portion 29 of the blade body 27 that automatically rolls is provided, which has the advantage that the blade body 27 can always cut in a good condition.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an embodiment of the present invention, and FIG.
3 is a side view of the cutting device, FIG. 4 is a plan view thereof, and FIG. 5 is a partially removed or cutaway front view of the cutting device. 10 is a main body, 11 is a shaft, 13 is a chuck, 15 is a cutting device, 16 is a support stand, 18 is a ball screw, 23
is an air cylinder, 27 is a blade, 28 is a shaft, 29 is a blade, 30 is a movable member, 31 is a shaft, 32 is a bushing made of an insulating material, 33 is an annular member made of an insulating strip, 37 is a conductor
40 is a polishing member, 38 is a control panel, 46 is a digital setting section, 47.48 is a digital switch, 90 is a paper tube, and 91 is a product. Agent Patent Attorney Akira Katsabe

Claims (1)

[Scope of Claims] 1. In an apparatus for cutting a paper tube by rotating a shaft that holds the paper tube by fitting it on the outside, and moving a circularly movably supported blade in the direction of the shaft. , means for applying a voltage between the blade and the shaft, and means for generating a signal to automatically separate the blade from the shaft by detecting the flow of current between the blade and the shaft. A paper tube cutting machine comprising: 2. A paper tube cutting machine according to claim 1, comprising:
A paper tube cutting machine characterized in that a polishing member is provided which automatically polishes the blade part when the blade body rotates by constantly applying liquid to the blade part around the blade body and pressing it. 3. A paper tube cutting machine according to claim 1 or 2, which includes a screw driven by an electric motor that moves the support base of the blade in a predetermined direction, and rotation of this screw is detected. It is equipped with an encoder and a digital setting means for setting the cutting width of the paper tube, and drives the screw each time one cutting is completed, and supports the screw every time the rotation of the screw detected by the encoder reaches a predetermined number of rotations. A method for cutting paper tubes characterized by stopping the table and emitting a signal to move the blade toward the paper tube and cut the paper tube.