JP3707578B2 - Manufacturing method of sheet feed shaft - Google Patents

Description

BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a sheet feed shaft used for feeding a sheet of a printer such as a printer or an office machine, or feeding a sheet such as a film used in an overhead projector.
[Prior art]
Conventionally, rubber paper feeding rollers have been widely used for paper feeding in office printers, etc., but this tends to cause variations in rubber hardness, roundness, and concentricity with the shaft. When performing multi-color printing by repeatedly feeding paper as in color printing, color shift may occur due to paper feed speed and deformation, and alteration and deformation due to wear of the feed roller are inevitable. There was an inconvenience.
On the other hand, a metal roller as a feed roller is integrally provided on a metal shaft, and after a nickel plating layer is formed on the metal roller, the nickel plating layer of the metal roller is subjected to a sand blasting process to obtain a surface. A sheet feeding shaft having a rough surface is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-267396.
According to this, the roundness of the metal roller can be ensured, and since there is no wear or deformation, it can be used as a roller for multicolor printing.
[Problems to be solved by the invention]
However, in such a conventional sheet feeding shaft, a large number of metal small protrusions are formed on the surface of the paper feed roller, so that paper or sheets in contact with this can be fed with a large frictional resistance. Although it can be secured for a relatively long period of time, the small protrusions are relatively fine, so dust accumulates between the small protrusions, wear gradually progresses due to paper feeding operation, and the roller surface gradually changes to a smooth surface. There was a problem that it could not be done.
In particular, when the sheet to be fed is a relatively hard film used in an overhead projector, the roller surface is particularly worn and cannot withstand long-term use. As a result, the film is placed at an accurate position (on the light illumination surface). There was a problem that the projected image was tilted because it was impossible.
In addition, in order to form small protrusions on a metal roller, it is necessary to form a nickel plating layer or to perform rough surface processing by sandblasting, which causes problems such as a large number of work steps and high product costs. It was.
The present invention solves the above-described problems, and accurately keeps a sheet of paper, a hard film, or the like in a desired direction while holding a sheet of paper or a hard film in an accurate position only by plastic processing on the circumferential surface of a metal round bar. It is an object of the present invention to provide a sheet feeding shaft that can be fed and a manufacturing method thereof.
The present invention also provides a sheet feeding shaft manufacturing method capable of manufacturing a sheet feeding shaft having spike-shaped projections having a high height and shape that is highly effective for paper feeding and film feeding using simple perforation means. With the goal.
Another object of the present invention is to provide a method for producing a sheet feed shaft that can form a perforated cutting blade on the outer periphery of a metal round bar in accordance with the type and application of the object to be conveyed such as paper or film. And
[Means for Solving the Problems]
In order to achieve the above-described object, one means of the present invention includes a support base that supports a metal round bar, a punch unit that is disposed opposite to the support base and is driven to reciprocate by a press, and the punch unit. A pair of perforating members that are detachably attached to each other and have a perforation cutting edge that is formed on opposite surfaces, and the relative distance of which is adjustable, and the punch unit is reciprocally driven by a press machine. Thus, the metal round bar is perforated .
Similarly, the other means includes a support base for supporting the metal round bar, a punch unit that is disposed opposite to the support base and driven to reciprocate by a press, and is detachably attached to the punch unit and has a perforating cutting blade Are formed on the surfaces facing each other and a pair of perforating members whose relative distance can be adjusted , and the cutting edge of the perforating cutting blade is formed in a triangular shape, a trapezoidal shape or an arc shape, and the punch unit is formed by a press machine. The metal round bar is perforated by the reciprocating drive and the perforating cutting blade .
Also other means, the support table and the punch unit and, and cutting edge for perforated detachably attached to said punch unit reciprocatingly driven by oppositely disposed in the press to the support base for supporting a metallic rod And a pair of perforating members that are formed on opposite surfaces and the relative distance of which can be adjusted, and the protrusion length of the cutting edge of the perforating cutting blade is the same or changed as a whole, and the punch unit is reciprocated by a press machine. This is characterized in that the metal round bar is perforated by the perforating cutting blade .
DETAILED DESCRIPTION OF THE INVENTION
Will be described below. FIG an embodiment of the present invention, FIG. 1 is a perspective view of a paper feeding apparatus main unit having more resulting sheet feed shaft to the present invention, in the figure, S is, A sheet feed shaft made of a metal round bar 1 is a hard rubber feed roller 2 that sandwiches a sheet 3 for feeding between the sheet feed shaft S.
As shown in an enlarged view in FIG. 2, the metal round bar 1 has a plurality of spike-like protrusions that stand up at an obtuse angle in the rotation direction of the metal round bar 1 on the circumference divided into three regions. A and B are formed along the circumferential direction and the axial direction by plastic working.
The spike-like protrusions A and B can be provided on the entire metal round bar 1, but in the illustrated embodiment, the spikes A and B extend over a plurality of rows in the longitudinal direction of the peripheral surface of the metal round bar 4. Moreover, they are alternately arranged in the circumferential direction as shown in the figure.
As shown in FIGS. 3 and 4, the protrusions A and B are formed in a spike shape that rises at an obtuse angle in the rotational direction of the metal round bar 1 by a perforating cutting blade, which will be described later, and in opposite directions. It is supposed to.
Accordingly, the protrusions A and B adjacent to each other in the circumferential direction on the circumferential surface have their rising directions opposite to each other.
When the above-described perforating cutting blade is cut relatively shallowly into the metal round bar 1, the protrusions A and B are formed on the metal round bar 1 as shown in FIGS. Spike-like protrusions that rise at right angles or obtuse angles to the rotation direction of can also be used. In this case, what is necessary is just to adjust the setting width | variety of the below-mentioned perforation member which opposes wide.
In the sheet feed shaft having such a configuration, the protrusions A and B formed on the outer periphery of the metal round bar 1 are sharply pointed, and in any rotation direction of the metal round bar 1. In addition to relatively flexible printing paper, it can be reliably hooked on a relatively hard film used in an overhead projector or the like, and can be smoothly fed out correctly in a specified direction and position by interaction with the feed roller 2. it can.
Further, the standing heights of the protrusions A and B are significantly higher than those of conventional sandblasting and the like, so that they are not easily worn and reliable paper feeding can be realized for many years.
Therefore, if this is used for multicolor printing, etc., it is possible to realize beautiful multicolor printing with no color misregistration without causing permanent deformation of paper or film.
FIG. 7 is a perspective view showing a sheet feeding shaft manufacturing apparatus applied to the sheet feeding shaft manufacturing method of the present invention. In FIG. 7, 11 is a base, and 12 is installed on the base 11. Reference numeral 13 denotes a lifter that pushes up the metal round bar 1 as a workpiece supported on the V block 12 from above the V block 12.
Reference numeral 14 denotes a resin collar which is wound around the metal round bar 1 and prevents it from directly touching the lifter 13. Reference numeral 15 denotes a metal round which is erected on the base 11 and has been processed. It is a material removal frame that prevents the rod from rising while stuck to the punch cutting edge.
Reference numeral 16 denotes a holding bush for supporting one end of the metal round bar 1, and an allocation gear 17 is integrally attached to the holding bush 16, and the allocation gear 17 meshes with a drive gear 19 of the stepping motor 18. Has been. Reference numeral 20 denotes a screw for fixing the holding bush 16 to the metal round bar 1.
Reference numeral 21 denotes a non-rotating member whose tip is engaged with the allocating gear 17 by receiving power from an air cylinder or the like. Reference numeral 22 is a tip of the metal round bar 1 which is brought into contact with the end via a magnet chip 23. This is a multi-point positioning motor cylinder.
Reference numeral 24 denotes a punch unit that is reciprocally driven, that is, driven up and down by a press machine. A pair of perforating members 25 and 26 are fixed to the punch unit by fasteners (bolts and nuts) 27.
Therefore, if the size of the punch unit 24 is selected, the mounting interval (set width) of the perforating members 25 and 26 can be arbitrarily set, and the depth, angle, and shape of the perforating cutting blade can be arbitrarily set. Become.
In the perforating members 25 and 26, for example, as shown in FIG. 8, a plurality of perforating cutting blades 28 are vertically engraved on one side facing each other. Reference numeral 29 denotes an insertion hole for the fastener 27.
Further, the perforating members 25 and 26 are opposed to each other as shown in FIG. 9 at a predetermined interval corresponding to the outer diameter size of the metal round bar 1, and these perforations facing each other. The relative distance of the cutting blade 28 can be adjusted, and the position of the cutting blade 28 is shifted by X / 2, which is half of one pitch X of the angle.
Next, a process of manufacturing the sheet feed shaft using the sheet feed shaft manufacturing apparatus will be described with reference to FIG. 10. First, when the punch unit 24 is lifted, the resin collar 14 and the holding bush 16 are placed on the lifter 13. The metal round bar 1 is arranged on the V block 12 so that is supported.
At this time, the lifter 13 is lifted by 2 mm to 3 mm by a spring (not shown), thereby preventing the machining portion from interfering with the V block 12 during the axial movement by the motor cylinder 22.
Next, the tip of the non-rotating member 21 is disengaged from the allocating gear 17, and the processing position of the metal round bar 1 is determined by rotating the stepping motor 18. 16 is fixed to the metal round bar 1, and the tip of the anti-rotation member 21 is engaged with the gear 17.
Then, the punch unit 24 at the top dead center position is lowered as shown in FIG. 11, and the perforating cutting blades 28 of the perforating members 25 and 26 are cut into opposing positions on the circumferential surface of the metal round bar 1. I will.
As shown in FIGS. 3 and 4, the notches cause the spike-like protrusions A and B to stand up to the same height at an angle of 90 degrees or more, as shown in FIGS. 3 and 4.
Thus, after the projections A and B are formed in each row, the biting of the perforating cutting blade 28 with respect to the metal round bar 1 is released with the help of the material 15 and the punch unit 24 is set to the top dead center. Raise to.
Subsequently, the non-rotating member 21 is again disengaged from the allocating gear 17, the stepping motor 18 is rotated by a certain angle, and the allocating gear 17 meshed with the drive gear 19 is similarly rotated by the certain angle. The rotation support position of the metal round bar 1 is changed.
After the rotation position of the metal round bar 1 is determined in this way, the rotation position of the allocating gear 17 is locked again by the anti-rotation member 17, and the perforating members 25 and 26 are lowered by the operation of the punch unit 24. In other words, similar protrusions A and B are formed in a row adjacent to the protrusions A and B of each row formed in advance.
Moreover, such operation | movement is repeated sequentially and the metal round bar 1 carries out 1 rotation, and complete | finishes the 1st process.
Subsequently, the perforating cutting blades 28 of the perforating members 25, 26 enter between the protrusions A, A, B, B formed in the first processing, and rise from each other in their respective gaps. The protrusions A and B having different directions are formed so as to be adjacent to each other in the circumferential direction.
In the final process, the metal rod 1 is finally rotated by one tooth and returned to the machining start point, and the metal round bar 1 is sent to the next machining position by the multipoint positioning motor cylinder 22.
FIGS. 12 and 13 show examples of the arrangement of the protrusions formed as described above. One protrusion A having a different rising direction is shown in a right-upward hatching as an order, and the other protrusion B is shown as an inverted eye on the left. It is shown by rising hatching.
FIGS. 14 to 17 show in section the cutting edge shapes of the perforating cutting blades of the perforating member 31 used in the sheet feeding shaft manufacturing apparatus described above, and FIGS. 18 to 21 show the metal shapes corresponding to these cutting edge shapes. The shape of the projection plastically processed on the round bar 32 is shown by an axial cross section.
That is, in the case of a triangular cutting edge shape in which all the perforating cutting blades 31a in FIG. 14 have the same shape and size, the protrusions 32a having the same shape as shown in FIG. The cutting edge shape is suitable for feeding a sheet such as a relatively hard film.
Further, as shown in FIG. 19, the triangular cutting edges 31b and 31c having different projecting lengths as shown in FIG. 15 are formed with protrusions 32b and 32c having a circular tip and different projecting lengths. The
Further, in the triangular perforated cutting blade row 31d whose projecting length changes to a concave shape in which the parallel perforated cutting blades are smoothly curved as a whole as shown in FIG. 16, the tip is circular as shown in FIG. Each of the protrusions 32d has different lengths, and the protrusion length changes as a concave arc as a whole.
Further, in the triangular perforated cutting blade row 31e in which the projecting length changes into a convex shape in which the perforated cutting blades arranged in a line as shown in FIG. 17 are smoothly curved as a whole, the tip is circular as shown in FIG. Thus, the protrusion row 32e whose protrusion length changes in a convex arc shape as a whole is obtained.
The perforated cutting blades 31b and 31c and perforated cutting blades 31d and 31e shown in FIGS. 15 and 16 are effective for feeding when the sheet to be fed has a predetermined uneven pattern or arc-shaped pattern and different thicknesses. Yes, it can also be used for a frictional rotation operation of a drum-shaped member having such a pattern.
FIG. 22 shows a plurality of perforating cutting edges 31f having a trapezoidal shape and the same size. In such a perforating cutting edge 31f, as shown in FIG. 23, an isometric projection 32f whose tip is a gentle arc-shaped edge is plastically processed.
According to such a protrusion 32f, the sheet to be fed is in competition with a soft material, and it is possible to avoid the blade tip from being strongly bited into the sheet and being damaged.
Note that the trapezoidal perforated cutting edge 31f as shown in FIG. 22 has different protrusion lengths as in the above-described embodiment, or has been changed into a concave or convex shape that is curved as a whole. Can also be used, which can accommodate sheet feeding for special purposes.
FIG. 24 shows a plurality of perforating cutting edges 31g that are substantially oval in shape and size and are adjacent to each other. With such perforating cutting edges 31g, as shown in FIG. In addition, the projection 32g having a substantially semicircular tip is plastically processed, and the projection 32g is substantially point-contacted with the sheet, which is effective for feeding a hard film or the like.
Note that, even in the perforating cutting edge 31g shown in FIG. 24, as in the above-described embodiment, the protrusion lengths are alternately changed, or the whole is changed to a concave shape or a convex shape that is curved. It can also be used, and this can cope with sheet feeding for special purposes.
In addition, the dimensions of the protrusions 32a to 32g are set to, for example, a width of about 0.05 to 0.3 mm and a height of about 0.04 to 0.2 mm. In addition to the uneven shape, various patterns can be arbitrarily adopted.
【The invention's effect】
According to invention of Claim 1 , it has a support stand which supports a metal round bar, and a punch unit which is opposingly arranged to this support stand and is driven to reciprocate by a press, and the perforating cutting blades face each other. Since the sheet feed shaft is manufactured using a configuration in which a pair of perforated members formed on the surface side and adjustable in relative distance are detachably attached to the punch unit, the sheet feed shaft includes It is possible to easily and quickly form protrusions having different rising angles and heights on the surface of the metal round bar.
Further, according to according to the invention of claim 2, since by using the eye Uchiki blade formed in a triangular or trapezoidal or arcuate cutting edge manufactures sheet feed shaft, the hardness of the sheet to be a sheet feeding etc. Thus, it is possible to easily form projections having a shape that can be optimally fed according to the material on the surface of the metal round bar.
According to the invention of claim 3 , since the sheet feeding shaft is manufactured by using the perforating cutting blade configured so that the protruding length of the cutting edge is equal or changed as a whole, it corresponds to the sheet shape and thickness. It is possible to easily produce a metal round bar having a projection capable of sheet feeding.
[Brief description of the drawings]
1 is a perspective view of a main part showing a paper feed apparatus having a sheet feed shaft which is more prepared to the embodiment of the invention.
FIG. 2 is an enlarged perspective view illustrating a sheet feeding shaft in FIG.
3 is an enlarged perspective view showing a protrusion shape in FIG. 1; FIG.
4 is an enlarged perspective view showing a protrusion shape in FIG. 1. FIG.
FIG. 5 is a perspective view showing another embodiment of a protrusion shape.
FIG. 6 is a perspective view showing another embodiment of a protrusion shape.
FIG. 7 is a perspective view showing an apparatus for manufacturing a sheet feed shaft used in one embodiment of the present invention.
8 is a perspective view showing a perforated member in FIG. 7. FIG.
9 is a bottom view showing an example of the arrangement of the perforated members in FIG. 7. FIG.
10 is a process diagram showing a process of forming protrusions with the perforating cutting edge in FIG. 3. FIG.
11 is a process diagram showing a process of forming protrusions with the perforating cutting edge in FIG. 3; FIG.
FIG. 12 is a front sectional view showing an example of arrangement of protrusions according to the present invention.
FIG. 13 is a side cross-sectional view showing an example of arrangement of protrusions according to the present invention.
FIG. 14 is a cross-sectional view showing a perforating cutting edge of a perforating member according to the present invention.
FIG. 15 is a cross-sectional view showing a perforating cutting edge of a perforating member according to the present invention.
FIG. 16 is a cross-sectional view showing a perforating cutting edge of a perforating member according to the present invention.
FIG. 17 is a cross-sectional view showing a perforating cutting edge of a perforating member according to the present invention.
18 is a cross-sectional view showing a protrusion shape corresponding to FIG.
FIG. 19 is a cross-sectional view showing a protrusion shape corresponding to FIG. 15;
20 is a cross-sectional view showing a protrusion shape corresponding to FIG.
FIG. 21 is a cross-sectional view showing a protrusion shape corresponding to FIG.
FIG. 22 is a cross-sectional view showing another perforation cutting blade according to the present invention.
23 is a cross-sectional view showing a protrusion shape corresponding to FIG.
FIG. 24 is a cross-sectional view showing another perforation cutting blade according to the present invention.
25 is a cross-sectional view showing a protrusion shape corresponding to FIG. 24. FIG.
[Explanation of symbols]
1 Metal round bar 12 V block (support)
24 Punch units 25, 26, 31 Perforating members 28, 31a to 31g Perforating cutting edges A, B, 32a to 32g Projections

Claims (3)

A support base that supports a metal round bar, a punch unit that is opposed to the support base and is driven to reciprocate by a press, and a surface that is detachably attached to the punch unit and facing the cutting edge And a pair of perforating members whose relative distances are adjustable, and the punch unit is reciprocated by a press to perform perforation processing on a metal round bar with the perforating cutting blade. Manufacturing method of sheet feed shaft. A support base that supports a metal round bar, a punch unit that is opposed to the support base and is driven to reciprocate by a press, and a surface that is detachably attached to the punch unit and facing the cutting edge And a pair of perforating members whose relative distances can be adjusted, the cutting edge of the perforating cutting blade is formed in a triangular shape, a trapezoidal shape or an arc shape, and the punching unit is driven back and forth by a press to make the perforation. A method of manufacturing a sheet feed shaft, wherein a metal round bar is perforated by a cutting blade for use . A support base for supporting the metallic rod, the surface side and the punch unit to be reciprocated by a press arranged opposite to the support base, which is detachably attached to said punch unit and the perforations for cutting edge facing each other And a pair of perforating members whose relative distances are adjustable, and the projecting length of the cutting edge of the perforating cutting blade is the same or changed as a whole, and the punch unit is reciprocated by a press machine for the perforating. A method of manufacturing a sheet feed shaft, wherein a metal round bar is perforated by a cutting blade .

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