JP3670112B2 - Sheet feed shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet feeding shaft used for feeding a sheet of a printing machine or a printer for an office machine, or feeding a sheet such as a film used in an overhead projector.
[0002]
[Prior art]
Conventionally, rubber paper feed rollers have been widely used for paper feed in office printers, etc., but this tends to cause variations in rubber hardness, roundness, and concentricity with the shaft. It is, therefore, in the case of performing multi-color printing by repeating the paper feed as color printing, can cause color shift by a feeding speed or deformation of the paper, also alteration, deformation avoided due to wear of the feed roller There was an inconvenience that it was not possible.
[0003]
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.
[0004]
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.
[0005]
[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, since the small protrusions are relatively fine, dust accumulates between the small protrusions during use, or wear gradually progresses due to repeated feeding operations, and the roller surface There was a problem that it gradually changed to a smooth surface and could not be used.
[0006]
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 were problems such as being unable to do so and creating a projected image tilted .
[0007]
In addition, since it is necessary to form a nickel plating layer or rough surface processing by sandblasting to form small protrusions on a metal roller, there are problems such as a large number of work steps and high product costs. was there.
[0008]
The present invention solves the above-mentioned problems, and accurately holds a sheet such as paper or a hard film in an accurate position in a desired direction only by plastic processing on a metal round bar circumferential surface. An object of the present invention is to provide a sheet feed shaft that can be fed.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a sheet feed shaft according to the invention of claim 1 includes a plurality of spike-like projections that rise on the circumferential surface of a metal round bar at an obtuse angle, an acute angle, or a right angle in the rotation direction of the metal round bar Are formed by plastic processing so as to be aligned in the circumferential direction and the axial direction, and the projections are provided separately in a plurality of axial regions of the metal round bar, and the projections in each region span a plurality of rows in the circumferential direction. In the sheet feeding shaft provided, the positions of the protrusion rows are formed by shifting an arbitrary angle in the circumferential direction between the regions .
In this case, it is preferable that the formation position of each region along the axial direction is sequentially shifted by an arbitrary angle in the circumferential direction.
Similarly, it is preferable that the protrusions in the plurality of rows adjacent to each other as a group are formed in the opposite direction.
Similarly, it is preferable that a difference in height is given to the protrusions in adjacent rows or groups.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 is a perspective view of a main part of a paper feeding device having a sheet feeding shaft according to the present invention. In the figure, S is a metal round bar. 1 is a sheet feed shaft, and 2 is a hard rubber feed roller that sandwiches a film or paper 3 to be fed between the sheet feed shaft S. The sheet feeding shaft S is provided with a plurality of projections which are cut by a width R along the axial direction with an interval T therebetween. The interval T is a portion of the collar and bush that supports the shaft S during processing of the protrusion, and this interval T may not be provided.
[0011]
2 and 3, the metal round bar 1 has a plurality of spikes that rise at an obtuse angle in the rotational direction of the metal round bar 1 on a circumference divided into a plurality of regions. The projections A and B are formed along the circumferential direction and the axial direction by plastic working. The metal round bar 1 is subjected to plating treatment with a film thickness of 1 to 20 μm on the surface and quenching treatment such as tuftride over a depth of 1 to 300 μm to improve durability. The spike-like protrusions A and B can be provided on the entire metal round bar 1, but are alternately arranged in the axial direction and the circumferential direction of the circumferential surface of the metal round bar 1, for example.
[0012]
Each of the spike-like protrusions A and B is formed into a spike-like 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 is formed in a direction opposite to each other.
[0013]
Accordingly, the protrusions A and B adjacent in the circumferential direction on the circumferential surface have their rising directions opposite to each other.
[0014]
Further, when the above-described perforating cutting blade is cut relatively shallowly with a wide setting width with respect to the metal round bar 1, the base end of the protrusion A is thin and easily bent outwardly as shown in FIG. As shown in FIGS. 6 and 7, the projection A viewed from the directions of arrows P and Q is a spike-like projection that rises at a right angle or an obtuse angle for a long time with respect to the rotation direction of the metal round bar 1. On the other hand, when the setting width of the perforated member is narrower than this, the base end of the projection A is difficult to bend, so that the length protruding outward is shortened, and as shown in FIG. 4 and FIG. It becomes the projection A of the eye. In this way, the height of the protrusion A is selected to be 20 to 150 μm. The same applies to the protrusion B.
[0015]
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 is possible to reliably hook any relatively hard film used in an overhead projector or the like, and smoothly feed it correctly in the specified direction and position by the interaction with the feed roller 2. .
[0016]
Further, the standing height of the protrusions A and B can be set freely and accurately, and is significantly higher than that of conventional sandblasting, so that it does not easily wear, and reliable paper feeding can be realized for many years. .
[0017]
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.
[0018]
FIG. 8 is a perspective view showing an apparatus for manufacturing a sheet feed shaft according to the present invention. In FIG. 8, 11 is a base, 12 is a V block as a support base installed on the base 11, Reference numeral 13 denotes a lifter that pushes up the metal round bar 1 from above the V block 12 as a workpiece supported on the V block 12.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
Reference numeral 24 denotes a punch unit that is driven up and down by a press machine, and a pair of perforating members 25 and 26 are fixed to the punch unit by fasteners (bolts, nuts, etc.) 27.
[0023]
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 set arbitrarily, and thereby the depth, angle, and shape of the perforating cutting blade can be arbitrarily set. It becomes.
[0024]
For example, as shown in FIGS. 9 and 10, the perforating members 25 and 26 have a plurality of perforating cutting edges 28 engraved in the vertical direction on one side facing each other. The perforating cutting blades 28, 28 of the perforating members 25, 26 are displaced by fixing the perforating members 25, 26, for example, in the lateral direction of each blade, that is , in the axial direction of the metal round bar 1. Arranged. Reference numeral 29 denotes an insertion hole for the fastener 27.
[0025]
In this embodiment, the rake angle θ is set at an angle of 2 ° to 10 ° from the blade edge so that the protrusions A and B have a sharp tip shape. As a result, the processing pressure can be reduced, and sufficient spike-like protrusions A and B can be obtained with fewer cuts.
[0026]
Further, the perforating members 25 and 26 are opposed to each other at a predetermined interval corresponding to the outer diameter size of the metal round bar 1, and the perforating cutting blades 28 facing each other are, for example, chevron shaped. The position is shifted by X / 2, which is half of one pitch X.
[0027]
Next, in order to manufacture a sheet feed shaft using the sheet feed shaft manufacturing apparatus, first, a metal collar 14 and a holding bush 16 are supported on the lifter 13 when the punch unit 24 is raised. The round bar 1 is placed on the V block 12.
[0028]
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.
[0029]
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.
[0030]
Next, the punch unit 24 at the top dead center position is lowered in the direction of the arrow in FIG. 8, 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.
[0031]
As shown in FIG. 2 and FIG. 3, spike-like projections A and B stand up at the same height at an angle of 90 degrees or more as shown in FIGS.
[0032]
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.
[0033]
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.
[0034]
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 the adjacent rows along the circumferential direction of the protrusions A and B in each row formed in advance.
[0035]
Moreover, such operation | movement is repeated sequentially and the metal round bar 1 makes one rotation, and complete | finishes a process. At this time, the protrusions A and B corresponding to the width R in FIG. 1 may be formed at a time depending on the size of the punch unit 24, or may be processed in several steps by shifting the punch unit 24 in the axial direction. In this case, the position direction, angle, and height of the protrusions A and B within the width R can be combined into various patterns by processing the punch unit 24.
[0036]
FIG. 18 shows a sheet feed shaft S which is an embodiment according to the main invention of the present invention.
[0037]
As shown in FIG. 18 (a), the sheet feed shaft S includes a metal round bar 1 and protrusions formed on the outer circumferences of the regions R1, R2, R3, R4, and R5 that are the five outer circumference areas of the round bar 1. It consists of A and B. Protrusions A and B of the basic pattern shown in FIG. 11 are formed on the outer periphery of the five parts R1, R2, R3, R4, and R5 as shown in a partially enlarged development view of FIG. 18B. . In this case, the protrusions A and B at the R2 portion are formed at an arbitrary angle in the circumferential direction, for example, the index angle is shifted by 1/4 with respect to the protrusions A and B at the R1 portion. , The projections A and B of the R4 part are further shifted in the circumferential direction by the same angle, and the projections A and B of the R5 part are on the same axis as the projections A and B of the first part R1. Is formed. For this reason, even if the round bar 1 is rotated by half a pitch, the projections A and B at some parts always bite into the film or paper 3. For example, the projections A or B of the parts R2 and R4 are located on the imaginary line P in FIG. 18B. For example, the projection A of the part R2 bites into and feeds out the paper 3 during normal rotation, and the part R4 The paper 3 can be sent out by the protrusion B.
[0038]
That is, the sheet feed shaft S according to the embodiment of FIG. 18 is processed by slightly shifting the processing start position in the circumferential direction when forming the protrusions A and B as described above. Protrusions A and B exist evenly on the surface of the stick 1, and at the initial stage of feeding paper or film, so-called first suction, the protrusions A or B of any part R1, R2, R3, R4, R5 must be It comes in contact with the end face of the paper or film, and the suction of the stable paper or the like becomes possible.
[0039]
Figure 11 is an enlarged development view partially showing a basic arrangement pattern of one metallic rod 1 to form the projections A, B with the perforation members 25 of the punch unit 24. In this case, the protrusions A and B are formed by shifting the perforating cutting edges 28 of the perforating members 25 and 26 facing each other by half of one pitch of the chevron, and all have the same shape and the same size. Further, here, the protrusions A and B formed by the perforating cutting blades 28 of the perforating members 25 and 26 are provided on the same axis over a plurality of rows, respectively, and the protrusions A of these rows are further provided. Comrades and B comrades are arranged so as to be aligned in the circumferential direction. Further, the directions of the protrusions A and B in the adjacent rows are in the opposite direction.
[0040]
By using the metal round bar 1 having such projections A and B, all the projections A and B facing the relatively soft film or paper 3 side by side on the same axis bite, so that It can be sent in both forward and reverse directions while being sandwiched between the roller 2 and a powerful conveying force.
[0041]
Further, FIG. 12 is provided with protrusions A and B for each row as shown in FIG. 11 so as to be displaced in the circumferential direction, for example, by half a pitch. This is effective for feeding the soft paper 3 in the reciprocating direction, and the number of protrusions on the same axis is smaller than that of the pattern of FIG.
[0042]
Further, FIG. 13 shows only the protrusions A having the same shape and size arranged on the same axial line and the same circumferential line on the entire peripheral surface of the metal round bar. In this case, all the projections A are cut and raised in a spike shape by one of the perforating cutting blades 28 of the perforating members 25 and 26. For this reason, the protrusions A in rows adjacent to each other are formed so as to face the same direction.
[0043]
In the metal round bar 1 having only such protrusions A, all the protrusions face the same direction, so the paper 3 sandwiched between the feed rollers 2 is sent out more strongly in only one direction. This is effective when printing in a single color. In this case, it is not necessary to consider the mutual displacement (pitch) of the perforating cutting edges 28 of the facing perforating members 25, 26, and the projection A can be formed easily and quickly. It is the same even if the protrusion B is used instead of the protrusion A.
[0044]
FIG. 14 shows another embodiment of the present invention. In this example, a projection A having a low height as shown in FIGS. 4 and 5 is used, and a projection B having a height as shown in FIGS. 6 and 7 is used. That is, here, the protrusions A and B in each row are aligned in the axial direction and the circumferential direction, and the heights of the protrusions A and B are different. In this case, there is a difference in the transport force in the forward direction and in the reverse direction, but during the transport, the high protrusion B is first pierced into the paper 3 or the like, and the number of protrusions per unit is reduced in a pseudo manner, Even under the same pressure, by deeply and deeply engulfing, it can produce a powerful conveying force even in materials that are difficult to stick, such as project films. Dispersing the high and low protrusions causes the high protrusions to pierce the film first, and eventually the lower protrusions to pierce or support the surface of the film, stabilize the film, and cause the film to become wrinkled and rusted. To prevent. Furthermore, since the number of protrusions adjusted in height does not change, it has the same basic pattern advantages as in FIG. Note that the protrusions A or B having different heights may be oriented in the same direction as in the pattern of FIG.
[0045]
On the other hand, in the case shown in FIG. 15, the protrusions A and B in each row shown in FIG. 14 are shifted in the circumferential direction, for example, by a half-pitch position. Can be reliably and smoothly delivered. 14 and 15 are effective for applications in which the paper 3 is sent out with a strong force on one side of reciprocation and with a weak force on the other side.
[0046]
FIG. 16 shows another embodiment of the present invention, in which two types of projections A and B are provided in a plurality of rows on the same circumferential direction and the same axis of the metal round bar 1, and A plurality of groups are alternately arranged with each of the low protrusions A and B as one group as well as the high protrusions A and B adjacent to each other.
[0047]
In this case, the effects of both the basic pattern shown in FIG. 11 and the pattern having the difference in elevation shown in FIG. 14 are obtained.
[0048]
FIG. 17 shows the arrangement in which the protrusions A and B are displaced in the circumferential direction in each group shown in FIG. 16. In this case, too, those shown in FIGS. It has the same action and effect.
[0049]
In the present invention, the protrusions A and B are provided in a plurality of regions as shown in FIG. 1 with a spacing T in the axial direction of the metal round bar 1. Specifically, the axial width R of each region is 5 to 100 mm, and the interval T is 5 to 300 mm. However, the interval T may not be provided.
[0050]
FIG. 19 shows an example of detailed dimensions of the protrusions A and B. Here, the tip width L is 10 to 500 μm, the tip thickness M is 1 to 300 μm, and the base width N is 0.2 to 5.0 mm.
[0051]
The base width N is a value employed in a practical range used for a machine of a scale such as a printer or a scanner.
[0052]
Further, the interval between the protrusions in the circumferential direction is determined according to the number of divisions depending on the combination of the shaft diameter and the protrusion height. For example, when the shaft diameter is 10 mm, the protrusion height is 40 to 90 μm, and the distance (peripheral length) is about 0.6 to 0.3 mm in 50 to 100 equal parts.
[0053]
Further, the width R of each projection group (working part) on the metal round bar 1 as an axis depends on the width of the perforating cutting edge 28, but as shown in FIG. 1, it is used in a machine of a scale such as a printer or a scanner. It is 5 to 100 mm in a practical range, and the projection group secures a distance T of 5 to 300 mm or more, and obtains the number of projections proportional to the axial length and the width R of the projection group which is the processing width.
[0054]
【The invention's effect】
As described above, according to the invention of the claims, since the position of each projection rows between each region is configured to so that to form by shifting the arbitrary angle to the circumferential direction, the metallic rod peripheral surface With this plastic processing alone, while keeping a sheet of paper or a hard film in an accurate position, it can be fed accurately in the desired direction, and the protrusions A and B are evenly present on the surface of the round bar. At the initial stage of feeding the film, so-called first suction, the projection A or B in any region (sites R1, R2, R3, R4, R5) always comes into contact with the end face of the paper or film, and is stable. The effect that it becomes possible to suck in the waste paper and the like is obtained.
[0055]
In addition, according to the invention of each claim, since the protrusion is provided so as to be provided in a plurality of rows in the circumferential direction of the circumferential surface of the metal round bar, in order to further complement the above effect, Only by plastic working on the peripheral surface of the round bar, an effect is obtained that a sheet such as paper or a hard film can be accurately fed in the target direction while being held at an accurate position from the start of feeding .
[0055]
Further, according to the invention of claim 3, in addition to the above configuration, the plurality of adjacent rows of protrusions are grouped, and the adjacent rows or groups of protrusions are formed in the opposite direction. In addition to the effect, it is possible to reliably and smoothly carry out the paper feeding and returning in both the reciprocating directions without slipping.
[0056]
According to the invention of claim 4, in addition to the above-described configuration, the projections in adjacent rows or groups are configured to have a difference in height, so that the high projections pierce the film or the like during conveyance and the same pressure is applied. Even a film that is hard to pierce produces a powerful conveying force, and the effect of making the above effect more complete can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a sheet feeding shaft according to an embodiment of the present invention.
2 is an enlarged perspective view showing a protrusion shape in FIG. 1. FIG.
3 is an enlarged perspective view showing a protrusion shape in FIG. 1; FIG.
4 is a side view of the protrusion shape in FIG. 1 viewed from the direction of arrow P in FIG.
5 is a plan view of the protrusion shape in FIG. 1 as viewed from the direction of arrow Q in FIG. 2;
6 is a side view of another protrusion shape in FIG. 1 viewed from the direction of arrow P in FIG.
7 is a plan view of another protrusion shape in FIG. 1 viewed from the direction of arrow Q in FIG.
FIG. 8 is a perspective view showing a sheet feeding shaft manufacturing apparatus according to the present invention.
9 is a perspective view showing a perforated member in FIG. 8. FIG.
10 is a side view of the perforated member shown in FIG. 9. FIG.
FIG. 11 is a partially enlarged development view showing the arrangement pattern of protrusions provided on the metal round bar of the present invention.
FIG. 12 is a partially enlarged development view showing another arrangement pattern of protrusions provided on the metal round bar of the present invention.
13 is a partially enlarged development view showing another arrangement pattern of protrusions provided on the metal round bar of the present invention. FIG.
FIG. 14 is a partially enlarged development view showing another arrangement pattern of protrusions provided on the metal round bar of the present invention.
FIG. 15 is a partially enlarged development view showing another arrangement pattern of protrusions provided on the metal round bar of the present invention.
FIG. 16 is a partially enlarged development view showing another arrangement pattern of protrusions provided on the metal round bar of the present invention.
FIG. 17 is a partially enlarged development view showing another arrangement pattern of protrusions provided on the metal round bar of the present invention.
FIG. 18 is a front view of a sheet feeding shaft according to an embodiment of the present invention and a partially enlarged development view of a protrusion.
FIG. 19 is a dimensional view of each part of the protrusion in the present invention.
[Explanation of symbols]
A, B Protrusion 1 Metal round bar 3 Paper S Sheet feed shaft
R1, R, 2, R3, R4, R5 region

Claims (4)

A plurality of spike-like protrusions rising at an obtuse angle, an acute angle or a right angle in the rotational direction of the metal round bar are formed on the circumferential surface of the metal round bar in alignment with the circumferential direction and the axial direction by plastic working , and In the sheet feed shaft in which the protrusions are provided separately in a plurality of axial regions of the metal round bar and the protrusions in each region are provided in a plurality of rows in the circumferential direction, A sheet feeding shaft, wherein the position is formed by shifting an arbitrary angle in the circumferential direction . The sheet feeding shaft according to claim 1, wherein the formation positions of the respective regions along the axial direction are sequentially shifted by an arbitrary angle in the circumferential direction . The sheet feeding shaft according to claim 1, wherein the plurality of rows of adjacent protrusions are grouped, and the adjacent rows or groups of protrusions are formed in opposite directions. 4. The sheet feed shaft according to claim 1, wherein a height difference is provided between protrusions in adjacent rows or groups.

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