JP5307342B2 - Sheet feeding shaft and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a spike-like protrusion exhibiting excellent paper or film feeding efficiency around an outer periphery of a metallic round bar without processing deformation of a shaft. <P>SOLUTION: In the sheet feeding shaft S having a plurality of protrusions A and B formed by plastic working and rising in a rotation direction on a circumferential surface of the metallic round bar 1 confronting with a feeding roller 2 while having a sheet therebetween, the protrusion is formed in axial different two portions on the outer peripheral surface of the metallic round bar by embossing, and comprises a plurality of the spike-like protrusions having different rising directions, and the plurality of the protrusions rising in the same direction are aligned along the circumferential direction and the axial direction, and the plurality of the protrusions rising to the opposite direction are deviated to the axial direction after the protrusion row. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

The present invention relates to a sheet feeding shaft used for feeding a sheet of a plotter, a printing device, a printer for an office machine, etc., a sheet of a film used in an overhead projector, and the like, and a manufacturing method thereof.

Paper feed devices such as printers for office machines used rubber paper feed rollers, but when performing multicolor printing while repeating paper feed back and forth as in color printing, the paper feed speed and Due to the paper quality, paper feeding unevenness may occur and color misregistration may occur. In addition, there is an inconvenience that quality change and deformation due to wear of the paper feed roller are unavoidable.

On the other hand, for example, Patent Document 1 and Patent Document 2 show sheet feeding shafts in which a metal shaft is directly sharpened and protrusions are integrally formed. According to this method, since the protrusion formed integrally with the metal roller shaft hardly feeds the paper and accurately feeds the paper, it can be used as a paper feed roller for multicolor printing.
JP-A-8-86309 Japanese Patent Laid-Open No. 10-109777

In such a conventional sheet feeding shaft, a large number of small protrusions are formed integrally with the shaft on the surface of a metal shaft as a paper feed roller. However, since the processing pressure is applied when forming the protrusions by the method of Patent Document 1, the shaft There has been a problem in that the paper may not be accurately fed.

In the case where a large number of small protrusions are formed in the forward and reverse directions integrally with the shaft by the method of Patent Document 2 on the surface of a metal shaft serving as a paper feed roller, Although it can be forcibly sent out, this sending is performed while repeating reciprocating conveyance in color printing, etc., so there are cases where there is no paper feeding error, and there is a problem that a slight slip sometimes occurs. there were.

That is, in the shaft according to the method described in Patent Document 1, it is necessary to apply a sufficient pressing force to the shaft so that the shaft does not rotate when processing for forming the protrusion is performed.

Therefore, the shaft may be deformed by a force applied to the shaft, and there is a problem that accurate paper feeding cannot be performed with such a deformed shaft.

On the other hand, the shaft according to the method described in Patent Document 2 will be described with reference to FIG. 11 and FIG. 14 schematically showing enlarged projections formed by the perforating cutting edges 25 and 26 shown in FIG. Is rotated in the direction of the arrow to feed the paper, the pointed portion of the protrusion a surely catches the paper, so that the paper can be reliably drawn or sent out to the feeding side of the arrow.

However, in the next stage, the projection b catches the paper, and unlike the above case, the back side of the projection catches the paper. For this reason, although the surface is rough and the surface of the material is exposed, there is a possibility that it may not be surely captured as compared with the pointed portion of the protrusion a.

That is, as shown in FIGS. 11 and 14, since the small protrusions a and b are alternately formed in the forward and reverse directions integrally with the shaft in the circumferential arrangement, the protrusions a having a strong conveying force and the weak protrusions b are formed. And capture paper feeding alternately.

This means that the number of protrusions is substantially reduced, and a paper feeding error may occur when the protrusion b should contribute compared to the protrusion a. There was a problem.

In particular, such a phenomenon occurs when a roll paper is fed, in order to prevent the paper from being damaged, a slight tensile force (generally referred to as back tension) is applied to the paper on the delivery side. For this reason, it is considered that a stronger conveying force is required on the feeding side, and if this becomes weaker, a sheet feeding error is likely to occur.

It may also occur when a relatively thick sheet, a stiff sheet, or a sheet with a smooth surface and a protrusion that is difficult to pierce is used.

The present invention solves the above-mentioned problems, improves the protrusion processing on the metal round bar peripheral surface, and keeps sheets such as paper and hard film in an accurate position in the intended direction. It is an object of the present invention to provide a sheet feeding shaft that can be fed accurately.

That is, the object is to make the protrusion b shown in FIG. 11 and FIG. 14 a protrusion a so that all protrusions generate the same conveying force and improve the conveying force.

Another object of the present invention is to provide a method for manufacturing a sheet feed shaft that can form spike-like protrusions having a high paper feed and film feed effect on the outer periphery of a metal round bar without causing deformation of the shaft. And

In order to achieve the above object, the means of the present invention is to form a plurality of protrusions that rise in the rotational direction on the circumferential surface of a metal round bar facing the sheet with a feed roller, by plastic working. In the sheet feed shaft, the facing cutting blade forming a group of protrusions continuous in one direction is opposed to the perforating cutting edge in the other direction so as to be adjacent to each other while being shifted in the axial direction on the end side. perforations for cutting to form a group of projections successively arranged, wherein said that the projections are mutually rising direction while being formed by perforation processing on the metallic rod outer peripheral surface consisting of opposite plurality of spike-like projections It is what.

In this case, a group of protrusions that are continuous in the other direction are formed at a low height , or a group of protrusions that are continuous in the other direction are formed at a low height, and the protrusions that rise in one direction are used for processing. It is preferable that the rotational force is balanced and formed.

Similarly, the other means shifts the plurality of protrusions for processing such that the rising rotational forces are balanced in opposite directions to the axial direction following the protrusion row contributing to the feeding , and the height increases as the distance from the protrusion rising in the same direction is increased. Is preferably formed so as to be sequentially lowered.

In addition, a plurality of protrusions contributing to feeding in the same direction are continuously arranged along the circumferential direction and the axial direction, and the protrusion height of the protrusion group located on the outermost side is sequentially increased toward the outer side. It is preferable that a plurality of projections for processing that is formed low and has a rising rotational force balanced in the opposite direction are shifted in the axial direction following the projection row contributing to the feeding .

Similarly, the other means is to support the metal round bar on the support base and sequentially rotate the metal round bar to face the perforation cutting blade forming a group of protrusions continuous in one direction. A perforating cutting blade that forms a group of protrusions continuous in the other direction so as to be adjacent to the end side of the cutting blade is displaced in the axial direction. performed simultaneously perforating machining at a position shifted in the direction, the rising direction opposite the plurality of spike-like protrusions are formed by the same rise direction in the same projection the group continuously along the the circumferential direction and the axial direction It is characterized by this.

The present invention has the following effects. According to the invention described in claims 1 to 4, on the circumferential surface of the metallic rod, a two projection group ing a plurality of spike-like projections which rise in the rotational direction of the metallic rod The first protrusion groups rising in the same direction are continuously arranged along the circumferential direction and the axial direction, and the second protrusion group rising in the opposite direction is connected to the first protrusion group in the axial direction. Since they are formed to be shifted and have the same rising direction within the same projection group, a basic effect is obtained that a sheet such as a roll paper or a hard film can be held at an accurate position and can be accurately fed in a target direction.

In addition to this, since the rising direction is reversed at a position shifted in the axial direction, and preferably a projection for processing with a low height is formed, an accurate projection is formed without shaft deformation. In addition, an effect is obtained that a sheet such as roll paper or a film can be reliably sent out in a target direction by rotating the metal round bar in any direction.

Further, according to the invention described in claims 5 to 7 , when the load applied to the pressure roller becomes large, there is an effect that reliable feeding can be secured even when the shaft is bent. It is done.

Further, according to the invention described in claim 8, the metal round bar is supported on the support base and the metal round bar is sequentially rotated so as to face each other and feed and process for each group. the perforations member on the side shifted axially eyes truncation blade group formed by performing simultaneously perforating machining at a position displaced in the axial direction for each group of the metallic rod peripheral surface, the rising direction contradictory Since a plurality of spike-like projections that are continuous along the circumferential direction and the axial direction are formed in pairs for feeding and processing , a simple perforation means is used for feeding and film The sheet feeding shaft having a spike-like projection having a high feeding effect can be produced at low cost.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of a paper feeding apparatus having a sheet feeding shaft according to the present invention.

In the figure, a sheet feed shaft S made of a metal round bar 1 is generally opposed to a feed roller 2 made of hard rubber or the like in order to sandwich paper 3 for feeding between the sheet feed shaft S. And imitate this.

In addition, as shown in FIG. 2 in an enlarged manner, the metal round bar 1 has a plurality of spikes that rise at an obtuse angle in the rotation direction of the metal round bar 1 on a circumference divided into three regions. The projections A and B are formed along the circumferential direction and the axial direction by plastic working.

The feeding projection A is formed to a height of 30 to 300 μm depending on the thickness of the fed paper.

That is, the sheet feeding shaft S according to the present invention has a plurality of protrusions that rise in the rotational direction on the circumferential surface of the metal round bar 1 facing each other with a sheet of paper 3, film, etc. sandwiched between the feeding roller 2. A and B are formed in a pair by plastic working.

The protrusion A is composed of a plurality of spike-like protrusions formed by perforating on the peripheral surface of the metal round bar 1, and further , the plurality of protrusions A contributing to feeding in the same direction are arranged in the circumferential direction and the axis. with columns set in succession along the the direction, formed with a lower offset in the axial direction a plurality of protrusions B followed the projection column and the height for the work such as rotational force is balanced rising in the opposite direction It is characterized by that.

In this case, a plurality of protrusions B for processing such that the rising rotational force is balanced in the opposite direction are shifted to both sides in the axial direction and the height is lowered, or a plurality of protrusions B for processing rising in the opposite direction are formed. It is preferable that the projection B is shifted in the axial direction following the row of projections A contributing to the feeding , and formed so that the height is gradually reduced as the projection B is separated from the projection A contributing to feeding in the same direction.

As shown in FIG. 3, the protrusion A is formed in a spike shape that rises at an obtuse angle in the rotational direction of the metal round bar 1 by a later-described perforated cutting blade, and rises along the circumferential direction and the axial direction. Make.

On the other hand, the projections B for processing are formed in a pair in a direction opposite to this and offset in the axial direction adjacent to the projection group contributing to the feeding .

Accordingly, the protrusions A that contribute to feeding adjacent to each other in the circumferential direction and the axial direction on the circumferential surface have the same rising direction in the protrusion group, and are offset in the axial direction and adjacent to the protrusions A. The rise is in the opposite direction to the protrusion B for processing such that the rising rotational force formed as a pair with the A group is balanced .

FIG. 4 specifically shows a cross section of the shaft 1 in order to explain the arrangement of the protrusions A and B.

In the sheet feed shaft having such a configuration, the surface of the protrusion A formed on the outer periphery of the metal round bar 1 is sharpened, and the surface cut and raised by the sharpening of the protrusion A is a rough material surface. Exposed.

Therefore, regardless of the rotation direction of the metal rod 1, the roll paper, the relatively flexible printing paper, and the relatively hard film used in overhead projectors can be securely hooked and fed. By the interaction with the roller 2, it is possible to smoothly feed or return correctly in the specified direction and position.

Therefore, if this is used for multicolor printing, it is possible to realize beautiful multicolor printing with no color shift without causing permanent deformation of paper or film.

FIG. 5 is a perspective view showing a sheet feeding shaft manufacturing apparatus according to the present invention. In the figure, the V block 12 is a support base installed on the base 11, and the lifter 13 is on the V block 12. A metal round bar 1 as a work material supported on the V block 12 is pushed up from above the V block 12.

Further, the resin collar 14 is wound around the metal round bar 1 to prevent it from touching the lifter 13 directly.

The material removal frame 15 is erected on the base 11 and prevents the processed metal round bar from rising while biting the punching cutting blade.

Further, the holding bush 16 supports 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 is meshed with a drive gear 19 of the stepping motor 18. ing.

The screw 20 fixes the holding bush 16 to the metal round bar 1. Further, the anti-rotation member 21 receives the power of an air cylinder or the like, and the tip is engaged with the allocation gear 17.

The tip of the motor cylinder 22 for multipoint positioning is brought into contact with one end of the metal round bar 1 via the magnet chip 23.

The punch unit 24 is driven up and down by a press machine, and a pair of perforating members 25 and 26 are fixed by attaching an insertion hole 29 with a fastener (bolt, nut, etc.) 27.

In the perforating members 25 and 26, for example, as shown in FIGS. 6 and 7, a plurality of perforating cutting blades 28 and 30 are formed in the longitudinal direction on one side facing each other.

Further, the perforated members 25 and 26 are attached to face each other as shown in FIG. 7 at a predetermined interval corresponding to the outer diameter of the metal round bar 1.

The perforation member 26 is shown in FIG. 6A, and the perforation member 25 is shown in FIG. 6B.

In FIGS. 6 and 7, the cutting blades 28 and 30 are drawn in an enlarged manner, so that the number is also expressed smaller than the actual one.

These opposing perforating cutting blades 28 and 30 are formed by shifting their positions in the axial direction so that the cutting blades 28 having the projections A as a group and the cutting blades 30 having the projections B as a group are adjacent to each other. It is installed on a punch unit 24 which is an attachment tool.

Further, the cutting blade 30 shown in FIG. 6A is configured such that the height of the protrusion formed by the machining becomes lower as it moves away from the cutting blade 28 shown in FIG. 6B to both sides.

Next, a process for manufacturing a sheet feeding shaft using such a manufacturing apparatus will be described with reference to FIGS.

First, the metal round bar 1 is placed on the V block 12 so that the resin collar 14 and the holding bush 16 are supported on the lifter 13 when the punch unit 24 is raised.

Then, as shown in the perforated members 25 and 26, it operates in the vertical direction while being maintained in parallel with the line passing through the axis of the metal round bar 1.

At this time, the lifter 13 is lifted by 2 mm to 3 mm by a spring (not shown). This prevents the machining portion from interfering with the V block 12 when the motor cylinder 22 moves in the axial direction. ing.

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. When the position is determined, it is held by the screw 20. The bush 16 is fixed to the metal round bar 1, and the tip of the rotation preventing member 21 is engaged with the gear 17.

Next, the punch unit 24 at the top dead center position is lowered, and as shown in FIG. 8, the perforating cutting edges 28 and 30 of the perforating members 25 and 26 are opposed to the circumferential surface of the metal round bar 1. A predetermined distance is maintained from the axis of the metal round bar 1 at a location, and the metal round bar 1 is cut parallel to the line passing through the axis.

As shown in FIGS. 3 and 4, the spike-like protrusions A and B stand up to the outside of the circumference at an angle of 90 degrees or more and at a predetermined height as shown in FIGS. 3 and 4. It will be.

That is, as shown in FIG. 9, the spike-shaped protrusion A is in the rotational direction of the metal round bar 1, and has a shaft core P by a dimension calculated in advance corresponding to the outer diameter dimension of the metal round bar 1. Is cut at a vertical position b parallel to the diameter line a passing through the axis P, and directly rises outward from the metal round bar 1 at an equal height.

On the other hand, unlike the protrusion A, the spike-like protrusion B is adjacent to the row of protrusions A on the opposite side, and the outer diameter of the metal round bar 1 is gradually lowered toward both sides along the axial direction. Is separated from the shaft core P by a pre-calculated dimension, cut at a vertical position c parallel to the diameter line a passing through the shaft core P, and rises directly from the metal round bar 1 to the outside.

In this case, the protrusion B is formed so that the rotational force that the cutting blade 28 acts on the shaft 1 when forming the protrusion A and the rotational force that the cutting blade 30 of the protrusion B acts on the shaft 1 are balanced. It only has to be.

That is, in FIG. 9, if the distance from the axis P is different, the difference between the position a and the position b gives a rotational force to the shaft 1.

If the cutting blade 28 and the cutting blade 30 are adjusted so as not to give a rotational force depending on the distance from the axis P and the difference in the number of protrusions A and B, the rotational force of the shaft can be prevented from being generated. .

In this way, it is not necessary to hold the shaft in order to prevent rotation, and the protrusions A and B can be formed without deforming the shaft.

After the projections A and B are formed in each row, the biting of the perforating cutting blades 28 and 30 with respect to the metal round bar 1 is released with the help of the material removal frame 15 and the punch unit 24 is moved upward. Raise to dead point.

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 adjacent rows in the circumferential direction of the protrusions A and B in the previously formed rows.

8 and 9 show the process of forming the projections A and B as described above by the cutting blades 28 and 30 for the two perforating members 25 and 26, and FIG. 8 shows the state before the projections A and B are formed. Yes, as the punch unit 24 is lowered as shown in FIG. 9, the projections A and B are simultaneously cut, and the projections A and B are formed one by one in sequence.

Thereafter, the punch unit 24 is raised, and the stepping motor 18 further rotates the allocating gear 17 by a certain amount to rotate the metal round bar 1 by one pitch in the same direction.

Then, the rotation of the allocating gear 17 is stopped again, that is, the punch unit 24 is lowered after being locked, and the metal round bar 1 is adjacent to each of the two rows of the projections A and B in the circumferential direction. The other projections A and B are formed.

Moreover, such operation | movement is repeated sequentially and the metal round bar 1 makes one rotation, and complete | finishes the 1st process.

In the final process, the tooth 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.

Subsequently, when this operation is continued again at that position, the perforating cutting blades 28 and 30 of the perforating members 25 and 26 are adjacent to the blocks of the respective projections A and B formed by the first processing. Blocks of protrusions A and B having different rising directions at intervals are formed.

Next, for the purpose of improving the paper feed efficiency, the shaft S may be deformed by applying a load to the feed roller 2 shown in FIG. 1, and even in this case, it is necessary to ensure feeding. There will be described an embodiment for that purpose.

In this case, when the load is applied, the shaft 1 is in an inclined state in which the central protrusion group protrudes upward among the three protrusion groups A formed on the metal round bar 1 shown in FIG. .

For this reason, the central projection group has a low rate of contribution to feeding, and the feeding force is concentrated on only the projections on the outer side of the projection group on both sides so that normal feeding can be performed. Disappear.

In order to cope with this phenomenon, the protrusions A formed on the protrusion groups on both sides in FIG. 2 are formed so that the heights are gradually reduced toward the outside.

FIG. 10 is a cross-sectional view showing the state of the shaft of this portion, where the left side is the outside of the shaft 1 and each projection A is formed such that the right side is high and goes down toward the left side.

That is, the shaft 1 has an inclination angle θ, for example, at the position shown in FIG.

Therefore, if the height of the projection A is adjusted in accordance with the inclination angle θ, all the projections A in this group can contribute to feeding, and normal feeding can be maintained.

As is clear from the above description, the protrusion heights of the outermost protrusion groups shown in FIG. 10 are formed so as to be progressively lower toward the outer side, so that both protrusion groups on the both sides of the feeding paper. The parallel projections and many protrusions can contribute to feeding, and normal feeding becomes possible.

In the above description, the embodiment in which the protrusions B adjacent to the group of protrusions A are formed on both sides of the protrusion A has been described. However, the present invention can be implemented only on one of the left and right sides.

Further, although the embodiment in which the height of the protrusion B is lower than the height of the protrusion A has been described, the protrusion A and the protrusion B have a difference in conveying force even when the height is the same. Such an embodiment is also within the scope of the technical idea of the present invention.

In addition, the protrusion B is an embodiment in which the height is gradually decreased as the distance from the protrusion A is decreased. However, the present invention is not necessarily limited thereto, and conversely, the protrusion B may be gradually increased. Even if the protrusions are the same while maintaining a certain low level, the protrusions can be efficiently implemented if the protrusions are high enough not to act on the feeding paper.

Further, the embodiment has been described in which the protrusion B adjacent to the group of protrusions A is formed adjacent to the protrusion A. However, the present invention is not limited to this, but is adjacent to or slightly separated from the group of protrusions A. Even if it forms so that it may continue in a group, it can implement.

That is, the protrusion in the reverse direction does not contribute to feeding and does not adversely affect the feeding.

Therefore, the protrusion A is a feeding protrusion, and the protrusion B has a role of a processing protrusion added from the construction method.

In the above embodiment, the metal round bar 1 is cut by the perforating cutting edges 28 and 30, and the spike-like protrusions A and B are formed at an angle of 90 degrees or more (obtuse angle). There is but is not limited to this.

That is, even when cutting is performed at an angle of 90 degrees or less (acute angle), the same effect as in the above-described embodiment can be obtained if applied to feeding when the rotation direction of the shaft is reversed. .

That is, in view of the market situation in which products having protrusions formed by etching or rolling are put into practical use, even if the angle is 90 degrees or less compared to them, the protrusions according to the present application in which the tip is sharply sharpened. It can be easily understood that the formed shaft has a much higher feeding efficiency.

Each of the above-described embodiments is one embodiment of the present invention, and is not limited to these embodiments. The embodiments are appropriately modified within the scope of the technical idea described in the claims. can do.

It is a perspective view of the principal part which shows the paper feeding apparatus which has a sheet feeding shaft by one Embodiment of this invention. It is a perspective view which expands and shows the sheet | seat feed shaft in FIG. It is a perspective view which expands and shows the protrusion shape in FIG. It is a fragmentary sectional view which expands and shows the protrusion shape in FIG. It is a perspective view which shows the manufacturing apparatus of the sheet feed shaft by one Embodiment of this invention. (A), (b) is a perspective view which shows the perforation member in FIG. It is a bottom view which shows the example of arrangement | positioning of the perforation member in FIG. It is a 1st process drawing which shows the formation process of the processus | protrusion by the cutting blade for punching in FIG. It is a 2nd process figure which shows the formation process of the processus | protrusion by the cutting blade for punching in FIG. It is a fragmentary sectional view which expands and shows the projection shape which formed the projection height of the projection group located in the outermost side in other embodiment of this invention gradually low as it progresses to the outer side. It is a perspective view which expands and shows the protrusion shape by the cutting blade for perforation in a prior art example. It is a bottom view which shows the example of arrangement | positioning of the perforation member in a prior art example. It is a fragmentary sectional view which expands and shows the projection shape in a conventional example. It is side surface sectional drawing which shows the example of arrangement | positioning of the protrusion in a prior art example.

1 Metal round bar 12 V block (support)
24 Punch units 25, 26 Perforating members 28, 30 Perforating cutting edges A, B Protrusions

Claims (8)

In a sheet feed shaft in which a plurality of protrusions rising in the rotational direction are formed by plastic working on the circumferential surface of a metal round bar facing the sheet between the feed rollers, the protrusions are arranged on the outer circumference of the metal round bar. a two projection group together rising direction ing from conflicting multiple spiky protuberances while being formed by perforating processed into different axial least two points in terms, the first projection group rises in the same direction and column set continuously along the the circumferential direction and the axial direction, is formed by shifting in the axial direction to continue the second projection group rises in the opposite direction to the first projection group identical rise in the same projection the group A sheet feed shaft characterized by its direction . In a sheet feed shaft in which a plurality of protrusions rising in the rotational direction are formed by plastic working on the circumferential surface of a metal round bar facing the sheet between the feed rollers, the protrusions are arranged on the outer circumference of the metal round bar. a two projection group together rising direction ing from conflicting multiple spiky protuberances while being formed by perforating processed into different axial least two points in terms, the first projection group rises in the same direction and column set continuously along the the circumferential direction and the axial direction, is formed by shifting in the axial direction to continue the second projection group rises in the opposite direction to the first projection group identical rise in the same projection the group The sheet feeding shaft is characterized in that the projection of the second projection group is formed with a lower height. In a sheet feed shaft in which a plurality of protrusions rising in the rotational direction are formed by plastic working on the circumferential surface of a metal round bar facing the sheet between the feed rollers, the protrusions are arranged on the outer circumference of the metal round bar. a two projection group together rising direction ing from conflicting multiple spiky protuberances while being formed by perforating processed into different axial least two points in terms, the first projection group rises in the same direction and column set continuously along the the circumferential direction and the axial direction, is formed by shifting in the axial direction to continue the second projection group rises in the opposite direction to the first projection group identical rise in the same projection the group The sheet feeding shaft is characterized in that the projection of the second projection group is formed with a lower height and the rotational force is balanced with the projection that rises in one direction for processing. In the sheet feed shaft a plurality of projections rising in the rotational direction on the circumferential surface of the metallic rod facing across the sheet made by formed by plastic working between the feed roller, the protrusions are metallic rod periphery facing each other rising direction while being formed form a pair in different axial least two points by the perforating processing consists conflicting plurality of spike-like projection group, the further plurality of protrusions contribute to feeding rises in the same direction Are arranged in series along the circumferential direction and the axial direction, and a plurality of projections for processing such that the rising rotational force is balanced in the opposite direction are shifted in the axial direction following the projections contributing to the feeding. sheet feed shafts, characterized in that it has the same rise direction in the height is formed so as to gradually decrease the same projections in the group as the distance from the projection group rises in the same direction together with . In the sheet feed shaft a plurality of projections rises in the rotation direction on the circumferential surface of the metallic rod facing across the sheet made by formed by plastic working between the feed roller, the protrusions are metallic rod periphery facing each other rising direction while being formed form a pair in different axial least two points by the perforating processing consists conflicting plurality of spike-like projection group, the further plurality of protrusions contribute to feeding rises in the same direction Are continuously arranged along the circumferential direction and the axial direction, and the protrusion height of the outermost protrusion group is formed so as to be gradually decreased toward the outer side, and the rising rotational force is balanced in the opposite direction. feeding the sheet, characterized in that the same rising direction a plurality of projections in the feed to continue contributing projections formed by shifting in the axial direction in the same projection group for processing Shaft. In the sheet feed shaft a plurality of projections rising in the rotational direction on the circumferential surface of the metallic rod facing across the sheet made by formed by plastic working between the feed roller, the protrusions are metallic rod periphery facing each other rising direction while being formed form a pair in different axial least two points by the perforating processing consists conflicting plurality of spike-like projection group, the further plurality of protrusions contribute to feeding rises in the same direction Are continuously arranged along the circumferential direction and the axial direction, and the protrusion height of the protrusion that contributes to feeding on the outermost side is formed so as to gradually decrease toward the outside, and the rising rotational force in the opposite direction JP that it has the same rise direction in following the contributing projections groups feed the sheet a plurality of protrusions for processing such balance is formed by shifting in the axial direction in the same projection group Sheet feed shaft according to any one of the preceding claims 2 to. 7. The sheet feed shaft according to claim 1, wherein the second protrusion group is disposed on both sides of the first protrusion group . The metal round bar is supported on a support base and the metal round bar is sequentially rotated so as to face a perforation cutting blade that forms a group of protrusions continuous in one direction, and an end of the perforation cutting edge. A cutting edge for perforation that forms a group of protrusions continuous in the other direction so as to be adjacent to each other with the position shifted in the axial direction on the side, and in a position shifted in the axial direction for each group of the circumferential surface of the metal round bar simultaneously performing perforation processing, two projection group including a plurality of spike-like projections rising direction continuous along with the circumferential direction and the axial reciprocal, the same projections in the group formed by the same rising direction A method for manufacturing a sheet feed shaft, characterized in that:

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