JPH03215021A - Folding back device of tube for roller - Google Patents

Abstract

PURPOSE:To fold back the excess length part of a tube for roller with good workability by a method wherein the excess length part of the tube for roller is diametrically expanded by the predetermined amount by diametrically expanding expanders with a pair of tube expanding mechanism and, after that, the expanders are moved with moving mechanism so as to fold back the excess length part to the outer peripheral surface of a mold. CONSTITUTION:Under the condition that the tips of respective expanders 39a are inserted in the excess length part 5a of a tube 5 for roller, the respective expanders 39a are diametrically expanded with a pair of tube expanding mechanism so as to diametrically expand the excess length part 5a to the dimension larger than the outer diameter of a mold 1. Next, the respective expanders 39a are moved to the outer peripheral surfaces at both ends of the mold 1 with their moving mechanism so as to fold back the expanded excess length part 5a to the outer peripheral surface of the mold 1. Thus, the excess length part 5a of the tube 5 for roller is automatically and diametrically expanded by the predetermined dimensions and can be folded back in a short period of time on the outer peripheral surface of the mold 1 without developing twisting and breaking.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for manufacturing a rubber roller having a tube on its surface using a mold, in which both ends of the tube are folded over the outer peripheral surface of the mold. Concerning tube folding device. (Prior Art) Copying machines and the like use rubber rollers that have tubes (hereinafter referred to as roller tubes) made of fluororesin or the like on their surface layers. Rubber rollers with this configuration are manufactured as follows. That is, as shown in FIG. 6, a core shaft 2 is placed at the center of a cylindrical mold 1, and the lower end of the core shaft 2 is supported by a metal fitting 3.4 for closing the mold 1. Fix it. In addition, the inner peripheral wall of the mold 1 is honed, and the roller tube 5 is inserted into the mold 1, and the extra lengths 5a, 5a at both ends of the roller tube 5 are placed on the outer peripheral surface of the mold 1. Fold it back and fix it to the mold l using a rubber ring 6, etc. A rubber roller is manufactured by injecting liquid synthetic rubber material 7 into the mold l and crosslinking it.

Incidentally, the work of folding back the extra length portion 5a of the roller tube 5 has conventionally been performed manually by an operator.

(Problem to be Solved by the Invention) However, when folding back the extra length 5a of the roller tube 5, it is necessary to expand the diameter of the extra length 5a and then fold it back onto the outer peripheral surface of the mold 1. be.

For this reason, when the diameter of the extra length part 5a is expanded manually by an operator, not only the diameter expansion dimension becomes large and the excess length part 5a may be torn, but also the folded excess length may be broken when the diameter expansion dimension becomes large. Since there is a portion of the long portion 5a that does not come into close contact with the mold l, the roller tube 5 may be twisted within the mold 1, resulting in a defective rubber roller having wrinkles on the surface layer (tube surface). Ta. Further, when the folding operation is performed manually, this operation takes, for example, about one minute, making it impossible to improve the productivity of the rubber roller.

The present invention has been made to solve these problems, and it is possible to expand the diameter of the extra length of a roller tube to a predetermined dimension and fold it back automatically without twisting or breaking, and with good workability. The purpose is to provide a folding device that can

(Means for Solving the Problems) The folding device of the present invention includes a pedestal on which a mold is placed, and a roller tube having an extra length at both ends and detachably attached to the pedestal and inserted into the mold. a pair of tube-sheathing support mechanisms for supporting both ends of the tube-sheathing tube, at least one of which moves toward and away from the tube-sheathing tube; and a plurality of concentrically arranged divided pieces. A pair of tube diameter expansion mechanisms that concentrically separate the divided pieces when the tip of the diameter body is inserted into the extra length part and expand the diameter of the diameter expansion body by a dimension larger than the outside diameter of the mold, and each diameter expansion mechanism. The present invention is characterized by comprising a pair of diameter-expanding body moving mechanisms that move the body with its diameter expanded to above the outer circumferential surface of both ends of the mold.

(Function) A tube-covering tube with a roller tube attached thereto is inserted into a mold placed on a pedestal, and a pair of tube-covering mechanisms are brought close to each other to support both ends of the tube-covering tube.

Next, when the tip of each diameter-expanding body is inserted into the extra length of the roller tube, a pair of tube diameter expansion mechanisms expand the diameter of each diameter-expanding body to make the extra length larger than the outside diameter of the mold. Also expands in diameter with large dimensions.

Next, each diameter-expanding body is moved by its moving mechanism to above the outer circumferential surface of both ends of the mold, thereby allowing the enlarged extra length to be folded back onto the outer circumferential surface of the mold. Therefore, the extra length of the roller tube can be automatically expanded to a predetermined diameter and folded back onto the outer circumferential surface of the mold in a short time without twisting or breaking the tube. (Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. 1 and 2 are a front view and a plan view of a folding device according to the present invention. In these figures, reference numeral 10 denotes a pedestal of the apparatus, and this pedestal 10 is supported by legs 11 on the floor or the like. Frame 10
A support 12 is fixed to the upper surface of the middle shaft, and the support 12
A pedestal l3 on which the mold 1 is placed is attached above. A V-groove 13a (see FIG. 2) is provided on the upper surface of this pedestal l3 to prevent the mold l from being transferred. Frame 1
At both ends of 0, there are attached cylinder support mechanisms 14 and 14'. These deposition cylinder support mechanisms 14, 14' are each equipped with a moving base 15, 15'. Each moving base 15
．． Each pair of sliding bodies 16.16 is attached to the lower surface of one side of 15', and the sliding bodies 16 are slidably attached to the guide rod 17. Bearings 1 are located at both ends and approximately in the center of the guide rod 17.
It is supported on a pedestal lO via 8. Further, a pole nut 19 having a ball arranged in a threaded groove is attached to the lower surface of the other side of each moving base 15, 15', and each pole nut 19 has a ball screw 20 provided with a threaded groove on the circumferential surface. .20'. As shown in FIG. 2, these ball screws 20, 20' are arranged parallel to the guide rod l7 and supported at both ends by bearings 2l. These bearings 21 are bolted onto the billow blocks 5l, and each billow block 51 is fixed on the frame lo. A toothed boot 22 is fitted and fixed to the opposing end of each ball screw 20, 20', and these toothed boots 22
A timing belt 23 is wound around the belt. As shown in FIG. 1, the timing belts 23, 23 extend below the pedestal 1O and are wound around the other toothed boobies 24, 24, respectively. These toothed bools 24.2
4 is attached to the shaft of the traverse motor 25.25', and these motors 25.25' are attached to the mounting base 26.
It is attached below the pedestal 1o via the mount 1o. Therefore,
When the traverse motors 25, 25' are driven, the timing belt 23 rotates via the toothed boolean 24, so that the ball screws 20, 20' rotate, respectively. Therefore, since the pole nut 19.19 starts to move on the hole screw 20.20', the moving base 15.15' moves on the pedestal 10 while being supported by the guide rod l7 and the ball screw 20.20'.

In addition, each deposition tube support mechanism 14, 14' has a movable base 15.
．． It has a support part 26 provided on 15'.

These support parts 26 have an L-shaped holding plate 28 supported on the movable base 15, 15' via a support plate 27.

A support rod 30.3 is mounted on each holding plate 28 via a bearing 29.
0' is supported so as to be able to move forward and backward in the axial direction. The rear ends of these support rods 30, 30' are slidably fitted into a small diameter shaft 31, and a nut 32 is screwed onto the small diameter shaft 3l while passing through the rising part of the retaining plate 28, whereby the retaining plate It is fixedly supported by 28. And small diameter shaft 3L
A coil spring 33 is mounted on the top, and this presses the support rods 30, 30' in a direction toward each other. A conical support tip 34 is provided at the tip of one of the support rods 3o.
is provided, and a large diameter portion 35 is provided at the tip of the other support rod 30'.
is provided. This large diameter portion 35 is the tube attachment cylinder 3.
6, and the support tip 34 is fitted into a tapered hole provided in an annular member 37 on the other end side of the tube attachment tube 36, thereby supporting both ends of the tube attachment tube 36.

A tube expander side 38 is disposed on the distal end side of each of the support rods 30, 30'. These tube diameter expansion mechanisms 3
8 has a substantially tapered expanded diameter body 39 arranged concentrically around the support rod 30, 30', and each expanded diameter body 39 has a plurality of diameter expanded bodies 39 (
For example, it consists of divided pieces 40 that are divided into eight pieces. Each divided piece 40 is stored at the inner end of the holding rods 41, 41 via a pair of protrusions, and each holding rod 41 is connected to the cylindrical body 42.
The cylindrical body 42 is arranged along the radial direction within the cylindrical body 42.
penetrates through. Each holding rod 41 is supported by a cylindrical body 42 by a coil spring (not shown), and is always elastically pressed toward the supporting rod 30 or 30'.

Therefore, since each divided piece 40 approaches each other, the diameter-expanding body 3
9 is maintained in a reduced diameter state. The cylindrical body 42 is attached to the movable base 15 or 15' by a fixed base 43 having an arcuate concave surface.
Fixed on top.

In addition, each tube diameter expansion mechanism 38 is connected to the support rod 30 or 30'
A moving body 44 is movably fitted onto the top. As shown in FIG. 1, these movable bodies 44 are movably fitted onto the support rod 30 or 30' via bearings, and the tapered surface of the flange-like large diameter portion 44a at the tip is connected to each divided piece. It is in contact with the inner tapered surface of 40. As shown in FIGS. 1 and 2, a connecting member 45 is rotatably connected to the outer peripheral surface of the movable body 44 via a cylindrical portion. It is attached together with the connecting member 47. The other connecting member 47 is pivotally supported on the upper end of the rotating lever 48, and the cylindrical portion 48a of the rotating lever 48 is fixedly fitted approximately at the center of the rotating shaft 49. This rotation axis 4
Both ends of 9 are rotatably supported by bearings 50.50,
These bearings 50 and 50 are bolted onto the row block 51 and fixed onto the frame 10. Rotation axis 49
A cylindrical portion 52a of another rotary lever 52 is fixedly fitted into one end of the rotary lever 52, and the rotary lever 52 is connected to a connecting member 53. This connecting member 53 is fixed to a rod of an air cylinder 54. The air cylinder 54 is connected to the movable base 15 or 15' via a support member 55 (see FIG. 1).
Fixed on top. Therefore, as shown in FIG. 4, when the air cylinder 54 is actuated and the rod protrudes, the rotary lever 52 rotates and the rotary shaft 49 is rotated, so that the other rotary levers 48 are also rotated. do.

Therefore, since the connecting rod 46 moves toward the cylindrical body 42, the movable body 44 moves toward the tip on the support rod 30 or 30'. As a result, the large diameter portion 44a of the movable body 44 presses each of the divided pieces 40 and concentrically separates them from each other, so that the diameter of the diameter expanding body 39 is expanded by a predetermined amount. That is, as shown by the two-dot chain line in FIG. 1, the diameter of the diameter-expanding body 39 is expanded until the cylindrical tip 39a of the diameter-expanding body 39 has an outer diameter slightly larger than the outer diameter of the mold l.

A stopper 56 for positioning the mold l is fixed to the lower horizontal frame 10a of the pedestal lO. This stopper 56
is made of an air cylinder, and has a bellows-shaped telescopic rod 56a that projects in the vertical direction, and a positioning protrusion 57 is attached to the upper end of the telescopic rod 56a for positioning the end surface of the mold 1 in contact with it. . This stopper 56 is held by the telescopic rod 56 until the mold 1 is positioned.
a is held in an extended state.

Incidentally, in this embodiment, the movement mechanism for the diameter expanding body 39 uses the same driving system as the movement base 15.15 and the traverse motors 25, 25'. Next, the operation and usage of the folding device of the present invention will be explained.

First, the mold l is placed on the pedestal 13. In this case, mold l
As shown in FIGS. 1 and 3, one end surface of the mold 1 is brought into contact with a positioning protrusion 57 of a stopper 56 to position the mold 1.

Next, only one traverse motor 25' is reversed, and the toothed pulley 24, timing belt 23. Toothed boolean 22. By rotating the ball screw 20' in the opposite direction, the movable base 15' is moved in the eight directions indicated by the arrows, and is moved to the position shown by the two-dot chain line.

As a result, the support rod 30' is spaced apart from the support rod 30, so that the tube covering cylinder 36 can be placed between them.

On the other hand, as shown in FIG. 3, the roller tube 5 is removably attached to the tube attachment cylinder 36. As shown in FIG. In this case, the extra length portion 5a of the roller tube 5 is extended from both ends of the tube adhering cylinder 36. 5a is made to protrude.

Next, a support rod 30' is attached to one end of this tube covering cylinder 36.
The large diameter portion 35 of the tube fitting cylinder 36 is held substantially horizontally.

Incidentally, while the traverse motor 25' is being rotated in the reverse direction, the stopper 56 is controlled to retract the telescopic rod 56a, and the positioning protrusion 57 is lowered to the height of the pedestal 10.

Thereafter, a start switch (not shown) is turned on to drive the traverse motors 25, 25' in forward rotation, and the movable base 15.
15' closer to each other. Therefore, the support rod 30.3
0'' also approach each other, the tube fitting cylinder 36 is inserted into the mold l, and the supporting tip 34 of the support rod 30 is fitted into the annular member 37 of the tube fitting cylinder 36.The movable base 15. 15' moves to a predetermined position where the support tip 34 is inserted, the traverse motor 25, 25' stops, and both ends of the tube attachment cylinder 36 are connected to the support rods 30, 30.
' is elastically supported via a coil spring 33.

Subsequently, both air cylinders 54, 54 start operating and move the moving body 44 on the support rods 30, 30'. Therefore, as shown in FIG. 4, since the divided pieces 40 are concentrically spaced apart, the diameter of both the expanded diameter bodies 39, 39 is expanded to be slightly larger than the outer diameter of the mold 1. Therefore, the roller tube 5
Extra length portion 5a. The diameter of the mold 5a is expanded to be larger than the outer diameter of the mold 1.

Finally, with the extra length portions 5a, 5a enlarged in diameter, the traverse motor 25.25' is further driven in the normal direction to move the movable bases 15.15' closer to each other, and the two-dot chain line in FIG. Move it to the position shown. Therefore, as shown in FIG. 5, the cylindrical tips 39a, 39a of the diameter-expanding bodies 39, 39 move up to the outer peripheral surface of the mold 1, so that the extra length 5a is enlarged in diameter.
, 5a are automatically folded back onto the outer peripheral surface of the mold l.

When the extra lengths 5a, 5a of the roller tube 5 are folded back, the movable base 15, 15' returns to the position shown by the solid line in FIG.
6a is extended, thereby automatically preparing for the next folding operation.

By the way, one turn-back operation using the device of the present invention can be completed in about 15 seconds, and therefore productivity is improved about four times compared to conventional manual work. Further, since the extra length portions 5a, 5a of the roller tube 5 can be automatically expanded in diameter by a predetermined amount, breakage and twisting can be reliably prevented, and quality-stable and excellent rubber rollers can be manufactured. be able to.

In the above embodiment, only the diameter expanding body 39 and the movable body 44 may be moved using an air cylinder or the like while the diameter of the diameter expanding body 39 is expanded, and the extra length portions 5a, 5a may be folded back.

(Effects of the Invention) As explained above, according to the present invention, the tube covering tube on which the roller tube is attached is inserted into the mold on the pedestal, and then the tube is While supporting both ends of the deposition tube, a pair of tube diameter expansion mechanisms expand the diameter of the diameter expansion body to expand the extra length of the roller tube by a predetermined amount, and the movement mechanism moves the diameter expansion body. This allows the extra length to be folded back to the outer circumferential surface of the mold, which not only allows the extra length of the roller tube to be folded back in a short time, but also prevents damage to the extra length and twisting of the tube itself. be able to. Therefore, it is possible to provide a folding device that folds back the excess length of the roller tube with good workability and provides a rubber roller of stable quality and excellent quality.

[Brief explanation of drawings]

1 and 2 are a front view and a plan view of the folding device according to the present invention, FIG. 3 is a sectional view showing the supporting operation of the device, and FIG. 4 is a sectional view showing the diameter expanding operation of the device, FIG. 5 is a cross-sectional view showing a part of the excess length of the apparatus folded back, and FIG. 6 is a cross-sectional view illustrating a method of manufacturing a rubber roller using a roller tube. 1 ---11--1 mold, 5--111--1-1 roller tube, 5a 1-
- - - - - 11 extra length, 1 0--1-1--1 mount, 1 3--1--1 cradle, 14.14' 1--1 mounting tube Support mechanism, 15.15
' ----1 moving base, 1 7---1-1 guide rod, 25.25' 1--1-1 rubber motor, 30.
30' -1--1 support rod, 36-------1-tube attachment cylinder, 3 8--11--1-tube diameter expansion mechanism, 3 9--1--
-1 expanded diameter body, 4 1 -1-1 holding rod, 4 2-1 cylindrical body, 44-1 moving body, 54-1 1---1-1 air cylinder. Fig. 3 5--Lobe tube '5a--1--Ichina Nagato Fig. 4 53 54

Claims (1)

[Claims] A device for folding both ends of a roller tube disposed in a cylindrical mold onto the outer peripheral surface of both ends of the mold, the device comprising: a pedestal on which the mold is placed; and a roller tube at both ends. a tube-covering cylinder which is removably fitted with an extra length and inserted into the mold; and a pair of tube-covering cylinders, at least one of which is movable so as to be able to approach and separate from the other to support both ends of the tube-covering cylinder. It has an expanding diameter body including a covering tube support mechanism and a plurality of concentrically arranged divided pieces, and when the tip of this expanding diameter body is inserted into each extra length portion at both ends of the roller tube, the above-mentioned a pair of tube diameter expansion mechanisms for expanding the diameter of each of the extra length parts by concentrically spacing a plurality of divided pieces in order to expand the diameter of the diameter expansion body; A roller tube folding device comprising: a pair of diameter-expanding body moving mechanisms for moving the diameter-expanding body to above the outer circumferential surface of both ends of the mold in an expanded diameter state.