JP4948942B2 - Method and apparatus for perforating elastic foam - Google Patents

Description

  The present invention relates to an elastic foam perforation method and apparatus.

  For example, as a paper supply roller or a toner supply roller of a copying machine, an insertion hole Wh of a shaft S is formed in a prismatic roller material made of an elastic foam W such as urethane foam or rubber sponge as shown in FIG. The shaft S is passed through and bonded to the insertion hole Wh, and the roller material is machined into a cylindrical shape as shown in FIG. As an apparatus for opening the insertion hole Wh in the prismatic elastic foam W shown in FIG. 10, a device disclosed in Patent Document 1 or Patent Document 2 has been proposed.

  In the drilling device disclosed in Patent Document 1, a cylindrical frame is fixed to a support base, and a pressing body supported by the support base in a reciprocating manner via a guide rail is provided inside the frame body. And compresses the prismatic elastic foam (roller material). Thereafter, the cylindrical blade is rotated to enter the compressed elastic foam from the blade insertion hole formed in the frame, and a hole (insertion hole) is formed in the elastic foam.

Further, in the punching device for an elastic body disclosed in Patent Document 2, a rectangular cylindrical pressing member is erected and fixed on the upper surface of the work plate, and a prismatic elastic body (roller material) is provided inside the cylindrical frame. The elastic body is compressed by housing and fitting the cylindrical frame body into the pressing member from above the pressing member and pressing the cylindrical frame body downward with a pressing plate connected to the piston rod. Then, the through hole formed in the central portion of the pressing plate and the cover plate of the cylindrical frame body enters the compressed elastic body while rotating the drilling tool, and the insertion hole is drilled in the elastic body. Yes.
JP-A-8-126997 JP 2001-18197 A

  The elastic foam (elastic body) drilling device disclosed in Patent Literatures 1 and 2 holds a cylindrical blade (drill) while holding the elastic foam compressed by the compression device in a predetermined position. Since the method of perforating by rotating into the elastic foam while rotating was employed, there were the following problems. That is, the chip is pressed against the inner peripheral surface of the insertion hole drilled by the centrifugal force by the rotation of the cylindrical cutter (drill), and the chip escape groove formed spirally on the cylindrical cutter (drill) to the outside. It becomes difficult to be discharged. Accordingly, the chips are not properly discharged during the drilling operation, and chips are caught between the outer peripheral surface of the drilling tool and the inner peripheral surface of the insertion hole, and the inner peripheral surface is not processed smoothly. Thus, there is a problem that the processing accuracy of the inner peripheral surface of the insertion hole is lowered. When the processing accuracy of the insertion hole of the elastic foam is lowered, the shaft having an outer peripheral surface coated with a hot-melt adhesive is passed through the insertion hole and heated to bond the shaft and the elastic foam. As the area decreases, a uniform adhesive force cannot be obtained. As a result, for example, when used as a toner supply roller, the shaft and the elastic foam may be broken and the function as the roller may not be properly exhibited.

  The present invention provides a method and apparatus for punching an elastic foam, which can solve the problems in the prior art and improve the processing accuracy of the inner peripheral surface of the insertion hole formed in the elastic foam. There is to do.

In order to solve the above problems, the invention according to claim 1 compresses and accommodates, for example, a rod-like elastic foam in the accommodation chamber. In this compressed state , the elastic foam held in the vertical direction is rotated. An insertion hole is formed in the elastic foam by allowing the drilling tool held in a non-rotating state to enter the rotational center position of the rotating elastic foam while being directed upward . After this step, the compressed state of the elastic foam in the storage chamber is released.

According to a second aspect of the present invention, in the first aspect, an escape groove for discharging chips is formed in the drilling tool, and the drilling tool is inserted to form an insertion hole in the elastic foam.

According to a third aspect of the present invention, there is provided a storage case for storing the elastic foam in a compressed state, a storage case for storing the elastic foam in a compressed state, and a rotating mechanism that rotates while holding the storage case in the vertical direction. When, in the rotation center position of the elastic foam in the compressed state in the accommodating case that is rotated while holding the vertical direction by the rotating mechanism, a drilling tool held in a non-rotating state below the housing case upward A drilling tool feed mechanism that is inserted in a directed state to form an insertion hole in the elastic foam.

The invention according to claim 4 is configured, for example, as a cylindrical accommodation jig in claim 3 so that the accommodation case can be handled as a single unit in a state where the compressed elastic foam is accommodated. .

(Function)
In the present invention, the elastic foam is accommodated in the accommodation chamber in a compressed state, and in a state where the elastic foam is rotated, a drilling tool is inserted into the elastic foam to form an insertion hole. For this reason, the drilling tool can be made non-rotating, and the chip is not pressed against the inner peripheral surface of the insertion hole in which the chip is drilled by the rotational centrifugal force of the drilling tool. Chips are smoothly discharged outside the insertion hole.

  In addition, since the present invention does not receive the rotational centrifugal force even when the compressed elastic foam is rotated at a high speed, the chip is smoothly discharged and the drilling tool is fed at a low speed in a non-rotating state. Thereby, the processed surface of the inner peripheral surface of the insertion hole formed in the elastic foam can be a smooth finished surface.

  According to the present invention, the chips are smoothly discharged from the chip escape grooves formed in the drilling tool during the drilling operation of the elastic foam insertion hole to the outside of the insertion hole. It can be prevented that the inner peripheral surface of the insertion hole is deformed by being caught between the inner peripheral surface of the insertion hole and the processing accuracy of the inner peripheral surface is lowered, and the processing accuracy of the insertion hole of the elastic foam is reduced. Can be improved.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment embodying a method and an apparatus for punching an elastic foam according to the present invention will be described with reference to FIGS.
Explaining the schematic configuration of the punching device of this embodiment, this punching device accommodates a cylindrical elastic foam W (elastic foam W in which the insertion hole Wh shown in FIG. 8 is not formed) in a compressed state, The housing jig 11 for the elastic foam W shown in FIG. 4 that can be handled as a single body (one work) is used. Then, the housing jig 11 is rotated by the rotating mechanism of the drilling device shown in FIG. 1, and a woodworking drill 45 as a drilling tool enters the compressed elastic foam W housed in the housing jig 11. Thus, the insertion hole Wh is formed in the elastic foam W.

  Therefore, first, the housing jig 11 will be described with reference to FIGS. The cylindrical housing case 12 of the elastic foam W housing jig 11 shown in FIG. 4 can be separated by the first and second case pieces 13 and 14 divided into semi-cylindrical shapes as shown in FIG. It is configured. In the state where both case pieces 13 and 14 are joined as shown in FIGS. 4 and 5, a cylindrical housing chamber 12a is formed at the center of the housing case 12 by two semi-cylindrical round grooves 13a and 14a. The Two compression pins 15 for compressing the cylindrical elastic foam W and the compressed elastic foam W are accommodated in the accommodation chamber 12a. A tool insertion hole 15a for inserting a drill 45 for forming an insertion hole Wh in the compressed elastic foam W is formed at the center of both compression pins 15, and a small diameter portion 15b and a stepped portion 15c are formed at one end. Is formed.

  As shown in FIG. 6, positioning holes 13 b are formed in two places on the joint surface of the first case piece 13. The second case piece 14 has two mounting holes 14b (only one is shown) corresponding to the positioning holes 13b. The two mounting holes 14b have the positioning holes 13b as shown in FIG. Positioning pins 16 to be inserted into the are attached by bolts 17. Then, both the first and second case pieces 13 and 14 are held in a regular combined state by engaging both the pins 16 with the positioning holes 13b.

  Semi-cylindrical small-diameter half-cylinder portions 13c and 14c are formed at both ends of the first and second case pieces 13 and 14, respectively, and semicircular arc-shaped locking protrusions are formed on the outer peripheral surfaces near the end portions. Strips 13d and 14d are formed. The case pieces 13 and 14 are connected by a connecting / holding tool 18 shown in FIG. The connecting / holding tool 18 has a function of connecting the first and second case pieces 13 and 14 as shown in FIGS. 4 and 5, and the compression pin 15 is provided in the storage chamber 12a. It has a function to prevent it from leaving. The connecting / holding tool 18 is fitted so as to sandwich both the cylindrical portions with respect to the both small-diameter half-cylinder portions 13c, 14c, and the concave connecting ridges connecting the first and second case pieces 13, 14. 18a is provided. Further, the connecting / holding tool 18 holds the compression pins 15 in the compressed position in a state where the compression pins 15 accommodated in the accommodation chamber 12a of the accommodation case 12 compress the elastic foam W. A concave holding ridge 18b is provided. Then, an operator engages the connecting protrusion 18a of the connecting / holding tool 18 with both the small-diameter half-cylinder portions 13c, 14c, and engages with the engaging protrusions 13d, 14d. The holding protrusion 18b is fitted to the base end portion of the small diameter portion 15b, and the step portion 15c is locked by the holding protrusion 18b. Thereby, the compression pin 15 is prevented from coming out of the storage chamber 12a of the storage case 12 by the compression reaction force of the compressed elastic foam W.

  In the housing case 12 of the housing jig 11 configured as described above, the uncompressed elastic foam W is compressed and stored using a simplified compression device as shown in FIG. Describing this compression operation, as shown in FIG. 7, the first case piece 13 is held in the semi-cylindrical holding groove of the lower case holding mold 19A arranged at a predetermined position, and the elastic foam W is placed in the round groove 13a. Accommodates the middle part. Thereafter, the second case piece 14 is joined to the first case piece 13, and the case pieces 13 and 14 are clamped and fixed between the lower case holding mold 19A and the upper case holding mold 19B.

  Next, the elastic foam W protruding outside from the storage chamber 12a of the storage case 12 is stored in the cylindrical storage chamber H formed by the lower and upper foam storage molds 20A and 20B that can be approached and separated. The compression pins 15 are inserted into the storage chamber H, and both compression pins 15 are pushed into the storage case 12 using a cylinder (not shown).

  Thereafter, when both compression pins 15 are pushed into the storage chamber 12a of the storage case 12 as shown in FIG. 4, the lower and upper foam storage molds 20A and 20B shown in FIG. The connecting / holding tool 18 is attached to both ends of the first and second case pieces 13 and 14.

  In this way, the elastic foam W can be held in a compressed state in the housing jig 11. Since the housing jig 11 can be handled alone, for example, the housing jig 11 can be rotated in the vertical direction as shown in FIG.

  The elastic foam perforating apparatus shown in FIGS. 1 to 3 rotates the elastic foam W by holding the elastic jig W in a compressed state while holding it in the vertical direction as shown in FIG. An insertion hole Wh is formed by a drill 45.

  As shown in FIG. 2, an elevating saddle 23 is supported by an elevating cylinder 24 on an elevating saddle 23 on guide rails 22 laid in parallel with each other in the vertical direction with respect to the front surface of the frame 21. As shown in FIG. 1, a boss portion 27a of a rotation support cylinder 27 is rotatably supported on a support plate 25 attached horizontally to the elevating saddle 23 through a radial bearing 26. The lower end portion of the housing jig 11 is fitted into the fitting hole 27b of the rotation support cylinder 27, and the small diameter portion 15b of the compression pin 15 is formed in the through hole 27c formed in the central portion of the boss portion 27a. It is designed to be inserted.

  As shown in FIG. 2, a spindle device 28 is vertically mounted on the front surface of the frame 21 so as to be positioned above the rotation support cylinder 27, and a lower end portion of the spindle 29 of the spindle device 28 is A fitting member 30 for fitting the upper end of the housing jig 11 is connected. A motor 31 is attached to the front surface of the frame 21, and the main shaft 29 is rotated by a belt drive mechanism 32.

  As shown in FIG. 1, the fitting member 30 includes a pedestal 33 having a through hole 33 a fixed to the front end surface of the main shaft 29 by a bolt, and the receiving jig fixed to the lower surface of the pedestal 33 by a bolt. 11 and the fitting cylinder part 34 which has the fitting hole 34a which can insert the upper end part.

  A through hole 29a is formed in the central portion of the main shaft 29, and an air blow nozzle 35 injects air into the through hole 29a toward the insertion hole 15a of one compression pin 15 located above the receiving jig 11. Be able to.

  As shown in FIGS. 2 and 3, a ball screw nut type feed mechanism 41 is vertically mounted on the front surface of the frame 21 so as to be positioned below the support plate 25 and is moved up and down by the servo motor 42. A tool chuck 44 is erected upward on the lifting saddle 43. The drill 45 is removably supported on the tool chuck 44, and the upper end of the drill 45 corresponds to the through hole 27 c of the rotation support cylinder 27. As shown in the partially enlarged view of FIG. 3, the drill 45 has a scribing blade 45a, a squeegee blade 45b, and a tip screw 45c at the tip, and a spiral chip relief groove 45d in the entire outer peripheral surface. The inner diameter dimension of the tool insertion hole 15a of the compression pin 15 is set slightly larger than the outer diameter dimension of the drill 45, and the woodworking drill 45 is guided and moved by the tool insertion hole 15a.

Next, the operation of the perforating apparatus for the elastic foam W configured as described above will be described.
As shown in FIGS. 2 and 3, the lower end portion of the storage jig 11 is inserted into the fitting hole 27 b of the rotation support cylinder 27 by the operator with the lifting saddle 23 and the lifting saddle 43 held in the retracted position at the lowermost end. Is inserted. Next, the elevating cylinder 24 is operated, and the elevating saddle 23, the support plate 25, and the rotation support cylinder 27 are lifted together with the storage jig 11 from the retracted position and stopped at the operating position. As a result, as shown in FIG. 1, the upper end portion of the housing jig 11 is fitted into the fitting hole 34 a of the fitting member 30, and the distal end portion of the small diameter portion 15 b of the compression pin 15 is inserted into the through hole 33 a of the base 33. Inserted.

  Next, the motor 31 is actuated to rotate the spindle 29 of the spindle device 28 at a rotational speed in the range of 1000 to 2500 / min, for example, and the housing jig 11 is rotated via the fitting member 30. In this state, when the feed mechanism 41 is operated to raise the lifting saddle 43 from the retracted position to the operating position, the drill 45 is not rotated and is positioned below the through hole 27c of the rotation support cylinder 27 as shown in FIG. It is inserted into the insertion hole 15a of the compression pin 15 and enters the compressed elastic foam W. For this reason, the insertion hole Wh is formed in the elastic foam W by the drill 45.

  After the insertion hole Wh is formed in the elastic foam W, the elevating saddle 43 is moved to the retracted position together with the tool chuck 44 and the drill 45. In this state, air is jetted downward from the air blow nozzle 35, and the chips remaining in the insertion hole Wh are discharged to the outside.

  Next, the raising / lowering cylinder 24 is actuated to move the raising / lowering saddle 23 together with the accommodation jig 11 from the operating position to the retracted position, and the operator removes the accommodation jig 11 from the rotation support cylinder 27.

  Finally, the operation of taking out the elastic foam W housed in the housing case 12 of the housing jig 11 is performed using the elastic foam W compressing device shown in FIG. The procedure is reversed.

According to the perforation apparatus of the said embodiment, the following effects can be acquired.
(1) In the above-described embodiment, the accommodation jig 11 that accommodates the compressed elastic foam W is rotated at a predetermined position, and the non-rotating drill 45 enters the elastic foam W. For this reason, since the chip does not receive the centrifugal force due to the rotation of the drill 45 during the drilling operation of the elastic foam W, the chips are smoothly discharged from the escape groove 45d of the drill 45 to the outside of the insertion hole Wh. The machining accuracy can be improved.

  (2) In the above embodiment, the compressed elastic foam W is rotated. For this reason, even if the rotational speed of the elastic foam W is increased, the chips are not affected by the rotational centrifugal force of the elastic foam W during the drilling operation, so that the chips are discharged smoothly and the drill 45 is fed. By reducing the speed, the processed surface of the inner peripheral surface of the insertion hole Wh formed in the elastic foam W can be made a smooth finished surface, and the processing accuracy of the insertion hole Wh can be improved. For this reason, when the shaft and the elastic foam W are bonded by heating the shaft whose outer peripheral surface is coated with the hot melt adhesive through the insertion hole Wh of the elastic foam W and heating, the bonding area becomes wide, Uniform adhesion can be obtained. Therefore, when the elastic foam W is used as, for example, a toner supply roller of a copying machine, the adhesion failure between the shaft and the elastic foam W is prevented, and the function as a roller can be properly exhibited.

  (3) In the above embodiment, since the receiving jig 11 is oriented in the vertical direction and the drill 45 enters the elastic foam W from below, the chips are smoothly moved downward by their own weight, and the chips Is smoothly discharged to the outside of the insertion hole Wh, and the processing accuracy of the insertion hole Wh can be further improved.

(4) In the above embodiment, since the housing jig 11 that can be handled as a single unit is rotated, the power required to rotate the housing jig 11 can be reduced.
(5) In the above embodiment, by compressing the elastic foam W to such an extent that no bubbles are present and setting the density to “1”, the cutting accuracy of the inner peripheral surface of the insertion hole Wh of the elastic foam W is improved. be able to.

  (6) In the above embodiment, when the insertion hole Wh is formed in the elastic foam W, the tip of the drill 45 is stopped at a position close to the lower surface of the upper compression pin 15, so that the drill 45 It is possible to prevent the tip of the drill 45 from coming into contact with the compression pin 15 and prevent the cutting edge of the drill 45 from being damaged.

In addition, you may change the said embodiment as follows.
As shown in FIG. 9, the storage case 12 is formed in a quadrangular prism shape, and the first and second case pieces 13 and 14 are formed with V-shaped square grooves 13e and 14e, whereby the storage chamber 12a of the storage case 12 is formed. May be formed in a square cylinder shape, and the compression pin 15 may be formed in a quadrangular prism shape. In this case, the fitting hole 27b of the rotation support cylinder 27 and the fitting hole 34a of the fitting cylinder part 34 shown in FIG. 1 are formed in a square cylinder shape, and the lower and upper case holding molds 19A and 19B shown in FIG. Each of the holding grooves is formed as a concave groove, and the storage chamber H formed by the lower and upper foam housing molds 20A and 20B is formed in a square tube shape.

  In the above embodiment, after the insertion hole Wh is formed in the rectangular columnar elastic foam W, the shaft is penetrated and bonded to the insertion hole Wh using a hot melt adhesive, and the elastic foam W is rotated together with the shaft. Then, the outer peripheral surface of the elastic foam W is machined from a rectangular tube shape to a cylindrical shape.

The drill 45 may be rotated at a low rotation speed (for example, 20 to 60 times / minute) in a direction opposite to the rotation direction of the housing jig 11.
In FIG. 1, the main shaft 29 and the fitting member 30 may be disposed on the lower side, and the drill 45 may be disposed on the upper side.

-You may make it hold | maintain the holding jig 11 sideways and rotate it, and the drill 45 may enter into the elastic foam W from a horizontal direction.
-You may comprise the 1st and 2nd case pieces 13 and 14 of the said accommodation jig | tool 11 integrally. Moreover, you may make the compression pin 15 into one.

-With the drill 45 held at a predetermined position, the accommodation jig 11 may be moved toward the drill 45 while rotating to perform drilling.
-Without using the storage jig 11 that can be handled as a single unit, after compressing and storing the elastic foam W in the storage case of the compression device, the storage case is rotated by the rotation device, and the drill 45 is elastically foamed. You may make it penetrate the body W and perform the drilling | piercing operation | work of the penetration hole Wh.

  The punching device of this embodiment is suitable when the number of processed elastic foams W is small and it is not necessary to use the holding jig 11.

The center part longitudinal cross-sectional view which shows the perforation apparatus of the elastic foam of this invention. The front view of a punching apparatus. The right view of a punching apparatus. The center part longitudinal cross-sectional view which shows the accommodation jig | tool which compresses and accommodates an elastic foam. FIG. 5 is an enlarged sectional view taken along line 1-1 of FIG. The exploded perspective view of a storage jig. The center part longitudinal cross-sectional view of the compression apparatus which compresses an elastic foam to an accommodation jig. The center part longitudinal cross-sectional view which shows the state which compressed and accommodated the elastic foam in the accommodation jig | tool. The cross-sectional view of the accommodation jig which shows another embodiment of this invention. The perspective view of the roller raw material used for a copying machine. The perspective view of the roller used for a copying machine.

Explanation of symbols

45 ... woodworking drill as a drilling tool, W ... elastic foam, Wh ... insertion hole, 11 ... storage jig, 12 ... storage case, 41 ... feed mechanism.

Claims (4)

A first step of holding the elastic foam in the up-down direction in a compressed state in the storage chamber;
Rotating the elastic foam held vertically in a compressed state by the first step, the rotation center position of the elastic foam, a drilling tool held in a non-rotating state below the receiving chamber upward A second step of forming an insertion hole in the elastic foam by entering in an oriented state ;
And a third step of releasing the compressed state of the elastic foam after the second step. 2. The drilling method for an elastic foam according to claim 1, wherein an escape groove for discharging chips is formed in the drilling tool , and the punching tool is inserted to form an insertion hole in the elastic foam. A housing case for housing the elastic foam in a compressed state;
A rotation mechanism that rotates in a state in which the storage case is held in the vertical direction;
The drilling tool held in a non-rotating state below the housing case is directed upward at the rotational center position of the compressed elastic foam in the housing case rotated while being held in the vertical direction by the rotating mechanism. A feed mechanism of a drilling tool that is inserted in a state to form an insertion hole in the elastic foam;
A perforating device for elastic foam, comprising: 4. The elastic foam punching device according to claim 3, wherein the storage case is configured as a storage jig so that the storage case can be handled as a single unit in a state in which the compressed elastic foam is stored.

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