JP4738653B2 - Continuous production method for rolls for OA equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method capable of efficiently and continuously producing a large number of rolls for OA equipment.
[0002]
[Prior art]
In particular, so-called OA devices such as printers, copiers, and other facsimile machines used in an environment such as an office are provided with an internal mechanism having a paper feed roll for feeding many sheets one by one. This paper feed roll has good contact friction with the paper and requires low durability even with frequent use, and generally has a structure in which a metal shaft of the required length is inserted in the axial direction into a cylindrical roll body made of urethane. have. Since the present invention relates to a method for manufacturing such a paper feed roll and the like, it is hereinafter referred to as “OA equipment roll” in the present specification.
[0003]
Since the paper feed roll described above is used in a large number of various OA devices, various efficient manufacturing methods have been proposed and implemented. For example, as a method of manufacturing a roll made of urethane material, a production method using a mold (die) and a production method of cutting out from a foamed urethane raw material are generally widely known. The former uses two halved molds with a hollow cavity made of a cylindrical half, and after placing a metal shaft of the required length in one mold, mold-clamping and injecting urethane, the urethane After foaming and curing, the roll surface is polished to form a roll with a shaft. The shaft is simply used as a core material, and the core material is pulled out from the obtained roll to form a hollow shaft hole, and then a regular metal shaft is separately inserted into the shaft hole to obtain a final product. .
[0004]
The latter is a urethane block to cut out the roll body by slicing the raw urethane foam, and a round bar-shaped roll body is manufactured by cutting with a cutter while rotating this block. The central axis of the roll body A roll having a hollow shaft hole is formed by polishing the surface of the roll after drilling a shaft hole having a required diameter along the surface. As a final product, a roll for OA equipment is completed by inserting a regular metal shaft into the shaft hole of the roll body.
[0005]
[Problems to be Solved by the Invention]
Since the mold production method described above is a so-called batch method, there are disadvantages in that a large amount of rolls for OA equipment is inefficient and poor in productivity, and the cost of installing a mold is greatly increased. Moreover, the roll main body obtained by demolding has a problem that it takes time and effort to remove burrs generated along the parting line. Further, the method of cutting out from the urethane foam raw material has many disadvantages that many processes and labors are required to obtain a roll shape, resulting in poor yield and high manufacturing cost. Therefore, if there is a system that can continuously produce rolls for OA equipment, which is the final product, one after another, it is considered extremely advantageous in terms of both the number of processes and the manufacturing cost, but such a system has not yet been put into practical use. There is no current situation.
[0006]
OBJECT OF THE INVENTION
The present invention has been proposed in order to suitably solve the above-mentioned problems, and can continuously produce a roll for OA equipment as a final product, has a small number of processes, and is low in production cost. It aims at providing the continuous manufacturing method of the roll which can be restrained to.
[0007]
[Means for Solving the Invention]
In order to overcome the above-mentioned problems and achieve the intended object, the present invention allows the main body portion of the release sheet continuously fed from the sheet supply source to pass inside the cylindrical guide member, and the length of the guide member. The sheet tubular body is formed by pulling the longitudinal end edges of the sheet extended outward from the slit opened in the direction,
While sequentially supplying the shaft of the required length in the axial direction inside the sheet cylindrical body, continuously injecting urethane raw material from the urethane injection head into the opening of the sheet cylindrical body,
In the process of moving the sheet cylindrical body inside the cylindrical guide member, the cylindrical guide member is heated to cure the urethane raw material, and the shaft is axially arranged at a required interval inside the sheet cylindrical body. Continuously molding the long rod-shaped urethane base material prepared for
The OA provided with the shaft at the center by peeling the release sheet from the rod-shaped urethane substrate and cutting the rod-shaped urethane substrate at a portion close to the open end of the shaft that is successively connected in the axial direction. An apparatus roll is manufactured.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, the continuous manufacturing method of the roll for OA equipment which concerns on this invention is given below, and a suitable example is given and demonstrated with reference to an accompanying drawing. FIG. 1 is a side view schematically showing a production line capable of suitably carrying out the roll production method of the present invention, and FIG. 2 is a schematic perspective view of the production line shown in FIG.
[0009]
(About production line)
The production line 10 shown in FIGS. 1 and 2 includes a supply unit 16 that feeds the release sheet 12 and supplies a urethane raw material 14, and a molding unit that foams the urethane raw material 14 to form a long rod-shaped urethane substrate 18. 20 basically. The release sheet 12 is continuously fed out at a constant speed toward the molding unit 20 and a shaft 22 having a required length, which will be described later, is sequentially supplied in the axial direction, and a urethane injection head 26 is provided on the upper surface of the release sheet 12. A long rod-shaped urethane base material 18 is formed inside the release sheet 12 formed into a cylindrical shape by supplying the urethane raw material 14 through the inside, and the shaft is formed inside the urethane base material 18 obtained. 22 is extended and included.
[0010]
(About supply section)
1 includes a feeding roller 28 that continuously feeds the release sheet 12 wound around the sheet supply source 24 toward the forming unit 20 at a constant speed, and a urethane raw material on the upper surface of the release sheet 12. And a urethane injection head 26 for continuously dispensing 14. The release sheet 12 that is continuously fed from the sheet supply source 24 by the feeding roller 28 and travels horizontally has a flat shape when passing through the feeding roller 28, but on the downstream side in the sheet feeding direction. When passing through the inside of a cylindrical guide member 34 (described later) of a required length, both end edges 30 and 30 in the longitudinal direction abut on each other like a palm and are formed into a cylindrical shape to form a sheet cylindrical body 32. The The amount of urethane supplied to the molding unit 20 is determined by adjusting the feeding speed of the release sheet 12 driven by the feeding roller 28 and the hourly amount of the urethane raw material 14 discharged from the urethane injection head 26.
[0011]
Here, the urethane raw material 14 immediately before being injected into the opening of the sheet cylindrical body 32 is a so-called mechanically stirred mixture of a gas such as an inert gas in a foam raw material made of, for example, diisocyanate and polyol. Those obtained by the mechanical floss method are used. Therefore, the urethane raw material 14 by the mechanical floss method is in a state of being finely foamed in advance. Further, instead of the urethane raw material 14 obtained by the mechanical froth method, for example, a foam raw material composed of diisocyanate and polyol is mixed with a foaming agent and is not foamed yet. Good. In the latter case, the foaming reaction proceeds in the cylindrical body 32 after being injected into the opening of the sheet cylindrical body 32.
[0012]
(About molding part)
The molding unit 20 includes a cylindrical guide member 34 having a required length that extends horizontally along the sheet supply direction, and a plurality of belt-shaped feed members that are disposed above the guide member 34 and face each other. 36. The cylindrical guide member 34 is configured as a pipe-shaped cylindrical body necessary for defining the external shape of the urethane base material 18 (which becomes the main body of the roll 38 for OA equipment), and is peeled off on the upper wall surface. A narrow slit 40 that allows passage of both end edges 30, 30 in the longitudinal direction of the sheet 12 is formed. Therefore, the release sheet 12 that has passed through the supply unit 16 passes the sheet main body part through the inside of the cylindrical guide member 34, and the both end edges 30, 30 in the longitudinal direction of the sheet 12 are held outward from the slit 40. Thus, the sheet cylindrical body 32 is formed. Further, both edge portions 30 and 30 extending in the shape of a palm toward the outside of the slit are clamped by the opposed belt-like feeding members 36 and 36 and pulled downstream in the sheet feeding direction. A heating member 42 typified by an electric heater is attached to the outside of the cylindrical guide member 34, so that the cylindrical guide member 34 is heated to an appropriate temperature to promote curing of the urethane raw material 14. It has become.
[0013]
The belt-like feeding members 36 are provided opposite to each other across the slit 40, and are arranged along the cylindrical guide member 34 so that a plurality of belt-like feeding members 36 are provided at a required interval. Each belt-like feeding member 36 has a part of the belt 44 facing the slit 40 and is driven at a constant speed by a driving device such as a motor (not shown). That is, as shown in FIG. 3, both end edges 30, 30 extending from the slit 40 in the form of a palm are sandwiched from opposite sides by belt-shaped feed members 36, 36 (belts 44, 44) opposed to each other, so that a constant speed is achieved. The sheet cylindrical body 32 is moved at a constant speed by the rotating belts 44. In addition, in the process in which the sheet cylindrical body 32 moves inside the cylindrical guide member 34, the foaming reaction of the urethane raw material 14 proceeds inside the cylindrical body 32.
[0014]
(About release sheet)
The release sheet 12 is made of a paper sheet or a resin sheet on which a release component such as silicon resin is applied at least on the side in contact with the urethane raw material 14. That is, the urethane raw material 14 is formed in the internal space of the sheet cylindrical body 32 using the release sheet 12 as a base material. The release sheet 12 is required when the urethane substrate 18 is molded in the production line 10 and is released from the urethane substrate 18 at an appropriate time after the molding of the urethane substrate 18 is completed.
[0015]
(About circular jigs)
As shown in FIG. 1 to FIG. 4, a metal shaft 22 having a required length is sequentially supplied in the axial direction with the center axis aligned in the sheet cylindrical body 32 made of the release sheet 12. . In this embodiment, a circular jig 46 shown in FIG. 4 is used as means for sequentially supplying the shaft 22 to the inside of the sheet cylindrical body 32 with the axes aligned. That is, the circular jig 46 is configured, for example, as a disk having a required thickness set to an outer diameter so as to obtain a diameter obtained by previously adding a grinding allowance (cutting allowance) in post-processing to the roll 38 for OA equipment. In the center of the jig 46, a center hole 48 that allows insertion of each open end of the shaft 22 is formed. That is, by setting the inner diameter of the center hole 48 to a size slightly smaller than the outer diameter of the shaft 22 and setting the plate thickness of the circular jig 46 to a certain extent, as shown in FIG. The end portions of the shafts 22 and 22 can be inserted and fixed oppositely to the center hole 48. Of course, if the economy is different, the circular jig 46 prepared separately may be inserted and fixed correspondingly at both ends of each shaft 22.
[0016]
Next, the continuous manufacturing method of the roll for OA equipment implemented by the manufacturing line 10 comprised as mentioned above is demonstrated. 1 and 2, the release sheet 12 is continuously fed out from a sheet supply source 24 in which sheets are wound in multiple layers, and a main body portion of the sheet 12 is passed inside a cylindrical guide member 34. Further, as shown in FIG. 3, both end edges 30, 30 in the longitudinal direction of the release sheet 12 are extended outwardly from the slits 40 formed in the longitudinal direction on the upper surface of the cylindrical guide member 34. Both edge portions 30 and 30 extending in the shape of a palm are pinched by the belts 44 and 44 of the belt-like feeding members 36 and 36 arranged opposite to each other and fed downstream in the sheet feeding direction. As a result, a sheet cylindrical body 32 obtained by rolling the release sheet 12 into a cylindrical shape is formed inside the cylindrical guide member 34.
[0017]
As shown in (1) and (2) of FIG. 4, the open end of the shaft 22 (which can be either a metal shaft used in the final product or a dummy shaft that is finally pulled out) The center hole 48 is inserted from one side. Further, another shaft 22 is inserted into the center hole 48 from the opposite side of the circular jig 46. Thus, the shafts 22 that are sequentially connected in an axially aligned state via the circular jig 46 are supplied to the inside of the sheet cylindrical body 32 from the top side. The supply speed of the series of shafts 22 (and the circular jig 46) at this time is appropriately controlled to synchronize with the feed speed of the sheet cylindrical body 32.
[0018]
In this state, as shown in FIGS. 1 and 2, the urethane raw material 14 is continuously injected into the opening of the sheet cylindrical body 32 through the urethane injection head 26. As a result, the urethane raw material 14 is spread and filled between the sheet cylindrical body 32 and the shaft 22 (held by the circular jig 46) positioned in the axial direction inside the cylindrical body 32. . Further, since a heating member 42 represented by an electric heater is disposed outside the cylindrical guide member 34, the guide member 34 is heated to a required temperature by energizing it. For this reason, the urethane raw material 14 is solidified (cured) in the process of moving inside the cylindrical guide member 34 together with the sheet cylindrical body 32, and as shown in FIG. The long rod-shaped urethane base material 18 provided in the axial direction is continuously formed in a state of being wrapped around the sheet cylindrical body 32.
[0019]
As described above, from the production line 10, a long rod-shaped urethane base material 18 having a plurality of shafts 22 therein at a predetermined interval is continuously formed. The obtained rod-shaped urethane base material 18 is manufactured through the steps of FIGS. 5 (1) to (3), whereby the roll 38 for OA equipment having the shaft 22 inserted through the center is manufactured. That is, the rod-like urethane base material 18 that has arrived from the production line 10 is in a state of being wrapped around the sheet cylindrical body 32 as shown in FIG. Therefore, as shown in FIG. 5 (2), the release sheet 12 constituting the sheet cylindrical body 32 is peeled from the rod-like urethane substrate 18. Next, as shown in FIG. 5 (3), the rod-shaped urethane substrate 18 is cut at a position close to the open end of the shaft 22 to obtain an OA equipment roll 38 having the shaft 22 at the center. Thereafter, a roll (38) for OA equipment with a shaft as a final product is manufactured through a step (not shown) of polishing the outer surface of each roll OA equipment 38.
[0020]
In the embodiment described above, the cylindrical guide member 34 has a true circular shape as shown in FIG. 3, but the cross section may have a vertically long elliptical shape as shown in FIG. Thus, when the cross section is set to a vertically long elliptical shape, fine pinholes that can be generated in the process of forming the rod-shaped urethane base material 18 inside the cylindrical guide member 34 are mainly concentrated above the elliptical portion (pinholes are not formed). (Because the bubbles that form rise). With respect to the rod-shaped urethane base material 18 thus obtained, the elliptical portion where the pinhole is generated is ground and removed by post-processing, so that the occurrence of the pinhole in the roll OA equipment roll 38 after being processed into a perfect circle is generated. There are advantages that can be achieved with less. Further, as shown in FIG. 7, the cylindrical guide member 34 may be formed in a vertical or vertical cross section in the vertical direction so that a plurality of shaft-like rod-shaped urethane base materials 18 are continuously manufactured. Furthermore, as shown in FIG. 8, the rod-shaped urethane base material 18 with two shafts can be continuously manufactured on the left and right sides by setting the cross section of the cylindrical guide member 34 in a horizontal shape.
[0021]
【The invention's effect】
As explained above, according to the continuous manufacturing method of the roll for OA equipment concerning the present invention, the roll for OA equipment which is the final product can be manufactured continuously, and the number of processes is larger than that of conventionally known manufacturing methods. There are few beneficial effects such as low manufacturing costs.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a production line capable of suitably carrying out a continuous production method for rolls for OA equipment according to the present invention.
FIG. 2 is a schematic perspective view of the production line shown in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
Fig. 4 (1) is a perspective view showing a state immediately before two shafts are inserted into the center hole while matching the axis from both sides of the circular jig, and (2) is a diagram showing two shafts of the circular jig. It is a side view which shows the state inserted and inserted into the center hole from both sides.
FIG. 5 is an explanatory view showing a process of using a long rod-shaped urethane base material obtained from a production line as a roll for OA equipment, wherein (1) is a rod-shaped urethane substrate wrapped in a sheet tubular body. (2) shows the rod-shaped urethane base material after peeling the sheet cylindrical body, and (3) shows individual rolls for OA equipment obtained by cutting the rod-shaped urethane base material.
FIG. 6 is a cross-sectional view of a modification of the cylindrical guide member, in which the cross section is a vertically long ellipse.
FIG. 7 is a cross-sectional view of a modification of the cylindrical guide member, in which the cross section is set to a vertical skewer type.
FIG. 8 is a cross-sectional view of a modified example of the cylindrical guide member, in which the cross section is set in a horizontal bowl shape.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Production line 12 Release sheet 14 Urethane raw material 16 Supply part 18 Urethane base material 20 Molding part 22 Shaft 24 Sheet supply source 26 Urethane injection head 28 Feeding roller 30 Both edges (release sheet)
32 Sheet cylindrical body 34 Cylindrical guide member 36 Belt-shaped feed member 38 Roll for OA equipment 40 Slit 42 Heating member 44 Belt (for belt-shaped feed member)
46 Circular jig 48 Center hole

Claims (6)

While passing the main body portion of the release sheet (12) continuously drawn from the sheet supply source (24) to the inside of the cylindrical guide member (34), a slit (in the longitudinal direction of the guide member (34) ( 40) to form the sheet cylindrical body (32) by pulling the longitudinal end edges (30, 30) of the sheet (12) extended from the outside in the form of a palm,
The required length of the shaft (22) is sequentially supplied to the inside of the sheet cylindrical body (32) in the axial direction, and a urethane raw material from the urethane injection head (26) is inserted into the opening of the sheet cylindrical body (32) ( 14) continuously infused,
In the process in which the sheet cylindrical body (32) moves inside the cylindrical guide member (34), the cylindrical guide member (34) is heated to cure the urethane raw material (14). A long rod-shaped urethane base material (18) provided with the shaft (22) in the axial direction at a required interval inside the body (32) is continuously formed,
The release sheet (12) is peeled off from the rod-shaped urethane substrate (18), and the rod-shaped urethane substrate (18) is cut at a position close to the open end of the shaft (22) that is successively connected in the axial direction. By doing so, the roll for OA equipment (38) provided with this shaft (22) in the center was manufactured, The continuous manufacturing method of the roll for OA equipment characterized by the above-mentioned. A circular jig (46) set to an outer diameter dimension is prepared so as to obtain a diameter considering a machining allowance in post-processing on the roll for OA equipment, and each open end of the shaft (22) is connected to the circular jig. The OA device according to claim 1, wherein the shaft (22) is sequentially supplied in the axial direction into the seat tubular body (32) in a state of being inserted and fixed in the center hole (48) of the tool (46). For continuous production of rolls. The longitudinal end edges (30, 30) of the release sheet (12) extending in a palm shape from the slit (40) of the cylindrical guide member (34) are opposed to each other across the slit (40). The continuous manufacturing method of a roll for OA equipment according to claim 1, wherein the roll is sandwiched between the shape feeding members (36, 36) and pulled downstream. A heating member (42) typified by an electric heater is disposed outside the cylindrical guide member (34), thereby heating the urethane raw material (14) moving inside the cylindrical guide member (34). And the continuous manufacturing method of the roll for OA equipment of Claim 1 which accelerates | stimulates the cure. The urethane raw material (14) immediately before being injected into the opening of the sheet cylindrical body (32) is preliminarily prepared by a mechanical floss method in which a gas such as an inert gas is mixed into a required foam raw material and mechanically stirred. The continuous manufacturing method of the roll for OA equipment of Claim 1 currently made to foam. The urethane raw material (14) immediately before being injected into the opening of the sheet cylindrical body (32) is in a state in which a foaming agent is mixed into a required foam raw material and has not yet been foamed. The continuous manufacturing method of the roll for OA equipment.

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