JP2011235336A - Method of manufacturing spur - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a spur capable of manufacturing the spur having a ridge part of high acuteness at low cost.SOLUTION: This method is a method of manufacturing the spur 10 formed alternately with the ridge parts 14 and a valley parts 16 in an outer circumference, contacting with a surface of a recording medium, and rolling in accompaniment to a conveying operation of the recording medium, and includes the first blanking process for forming a portion serving as ridgeline parts 14A, 14A opposed alternately to the valley parts 16, and the second blanking process for forming a portion serving as ridgeline parts 14B, 14B opposed alternately to the remained valley parts 16, the ridgeline part 14B formed in the second blanking process is formed to be crossed with the ridgeline part 14A formed in the first blanking process, and a top part of the ridge part 14 is formed acutely, in the method of manufacturing the spur.

Description

  The present invention relates to a spur manufacturing method.

In an ink jet printer which is an example of a data recording apparatus, as a spur used for a driven roller that abuts on the surface of a print paper discharged by a driving roller constituting a paper discharge mechanism and rotates in accordance with a paper discharge operation, for example, FIG. 11 is provided.
That is, after punching a thin metal plate into the ring-shaped main body portion 12 by punching or the like, the chevron portion 14 is formed on the outer peripheral edge of the main body portion 12, and further, the rotation shaft is provided at the central portion of the main body portion 12. A sleeve portion 18 for insertion is formed by synthetic resin.

JP 2003-341873 A

In the spur 10 disclosed in Patent Document 1, a chevron 14 is formed on the outer peripheral edge of a ring-shaped main body 12 with a required interval. Such a chevron 14 is usually formed by etching (not shown) in addition to punching press using a press die 100 as shown in FIG. Since the spur 10 rolls on the surface of the recording medium when the recording medium is delivered, it is desired that the tip portion of the chevron 14 is sharply formed so as not to damage the surface of the recording medium. In order to form the tip portion of the chevron portion 14 sharply, it is necessary to increase the processing accuracy of the chevron portion forming portion 110 of the press die 100, and the production cost of the press die 100 has increased.
Further, at present, the sharpness (so-called radius dimension) in the chevron portion forming portion 110 of the press die 100 has a limit in the range of R = 0.02 to 0.025, and the chevron shape required for the spur 10. Corresponding to the demand for the sharpness of the part forming part 110 is becoming difficult.
Furthermore, the press die 100 having such a chevron portion forming portion 110 has a very short life, and in order to mass-produce the spur 10, it is necessary to frequently replace the press die 100. 10 production cost reduction was also hindered.

Therefore, the applicant can form the spur 10 with the press die 100 having a long life, which can be manufactured at low cost by forming the chevron portion 14 on the outer periphery of the spur 10 by two punching press processes. Was attempted by the method shown in FIG.
In carrying out this trial production method, two press dies 100A and 100B are required because the spur 10 is formed by two punching press processes as shown in FIG.

  However, the manufacturing cost of each of the press dies 100A and 100B is easy to process, and even if the manufacturing cost of the press dies 100A and 100B is reduced and the number of press dies 100 is increased, the press shown in FIG. The press dies 100A and 100B can be procured at a cost significantly lower than the manufacturing cost of the dies 100. Further, the tip shape of the chevron portion 14 can be formed in a sharper shape than the tip shape of the chevron portion 14 in the prior art, and the press dies 100A and 100B have a long service life. The replacement frequency of the molds 100A and 100B was also greatly reduced as compared with the press mold 100 shown in FIG.

  According to the processing method of the chevron portion 14 using the press dies 100A and 100B shown in FIG. 12, the area of the punched bite portion of the first press die 100A (see FIG. Since the 12 (A) hatching portion) is sufficiently formed, punching can be performed without any problem. However, if the tip of the chevron 14 is to be sharply formed, the area of the punched bite portion of the press die 100B used for the second punching press process (the hatched portion in FIG. 12B) is small. It became clear that it would become. When the second punching press process is performed in such a state, the punched waste cannot be properly discharged from the die portion, and the punch waste is scattered from the die portion. There is a possibility that the spur 10 may be damaged due to being mixed in, and the manufacturing efficiency is lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a spur manufacturing method capable of manufacturing a spur having a mountain-shaped portion with high sharpness at low cost.

In order to achieve the above object, the present invention has the following configuration.
That is, in the manufacturing method of a spur in which crests and troughs are alternately formed on the outer periphery, contact with the surface of the recording medium, and roll with the conveying operation of the storage medium, every other trough A first punching step for forming a portion to be a ridge line portion facing each other, and a second punching step for forming a portion to be a ridge line portion facing each other remaining trough portion, In the spur manufacturing method, the ridge line portion formed in the punching step is formed so as to intersect the ridge line portion formed in the first punching step, and the top portion of the peak portion is formed sharply. is there.

Further, in the first punching step and the second punching step, a notch portion having a required width and a wider back side than the inlet side may be formed at the bottom of the valley portion.
Further, it is preferable to include a step of forming an outer peripheral portion larger than a spur to be formed before the first punching step.

  According to the spur manufacturing method of the present invention, it is possible to provide a spur having a mountain-shaped portion with high sharpness at high efficiency and at low cost.

It is the front view (A) and sectional view (B) which show some spurs in this embodiment. It is the enlarged plan view which expanded a part of outer periphery of a spur. It is a top view which shows the state in each manufacturing process of the spur in this embodiment. It is a partial top view which shows the state in each manufacturing process of the spur in this embodiment. It is a partial top view which shows the state in each manufacturing process of the spur in this embodiment. It is a partial top view which shows the state in each manufacturing process of the spur in this embodiment. It is a partial top view which shows the state in each manufacturing process of the spur in this embodiment. It is a partial top view which shows the state in each manufacturing process of the spur in this embodiment. It is a front view of the driven roller equipped with a spur in the first embodiment. It is a top view which shows the punching press metal mold | die in this embodiment. It is a description top view of the spur and press metal mold | die used for a spur and the process of a spur in a prior art. It is an explanation top view of a spur and a press die at the time of trial manufacture of a spur by the present applicant.

  Embodiments of a spur according to the present invention will be described below with reference to the drawings. Drawing 1 is a front view (A) and a sectional view (B) showing some spurs in this embodiment. FIG. 2 is an enlarged plan view in which a part of the outer peripheral edge of the spur is enlarged. In the present embodiment, the spur 10 constituting a part of the driven roller of the paper discharge mechanism in the ink jet printer will be described.

  The spur 10 in the present embodiment is formed of a thin plate made of stainless steel (having a thickness of about 0.1 mm to 0.15 mm). As shown in FIG. 1 (A), the spur 10 includes a main body portion 12 serving as a base portion, mountain-shaped portions 14 and valley portions 16 alternately formed on the outer peripheral edge (on the outer periphery) of the main body portion 12, and a main body. The sleeve portion 18 is formed at the center of the portion 12 and allows the rotation shaft to be inserted therethrough. The spur 10 thus formed has a diameter of about 7 mm to 10 mm.

  As shown in FIG. 1A, the mountain-shaped portion 14 is formed in a sharp shape without having a rounded portion at the tip. Further, as shown in FIG. 1B, the chevron 14 gradually decreases in thickness as it approaches the tip from the main body 12 side. That is, the cross-sectional shape of the mountain-shaped portion 14 is formed in a taper shape. By adopting such a shape of the chevron 14, the chevron 10 of the spur 10 that rolls on the printing surface when the printing paper is carried out is in point contact with the printing paper. It is convenient without damaging it.

  A trough portion 16 is formed between the chevron portions 14, and a bottom portion of the trough portion 16 (a portion on the radially inner side of the main body portion 12) is formed over a required range toward the radially inner side of the main body portion 12. A cutout portion 17 is provided. In the present embodiment, the trough forming portion 17Z, which is a portion of the press mold that forms the cutout portion 17, corresponds to the punched portion. In the second punching press die to be described later, in order to improve the biting degree of the punched residue to the die, it is necessary to give the required area to the notch portion forming portion 17Z that becomes the punched bitten portion. . Therefore, in the present embodiment, as shown in FIG. 2, the notch 17 is formed at the bottom of the valley 16 with a separation distance (opening width) dimension W1 on the inlet side of the notch 17 and the depth of the notch 17. When the width dimension W2 on the side is compared, a shape that satisfies W1 ≦ W2 is employed.

  The depth dimension D of the notch 17 is not particularly limited, but it is necessary to have a dimension sufficient to allow the punched residue to bite the die. By forming the notch portion 17 (notch portion forming portion 17Z) having such a shape, when the chevron portion 14 is punched and punched in two steps, the punched die to the die at the time of the second punching press processing The degree of biting can be improved, and the waste can be reliably discharged (dropped) to a predetermined discharge location without being discharged from the die portion (without flying up).

  In FIG. 1, in order to reduce the weight of the spur 10, a notch 17 is formed on the bottom of all the valleys 16, but the notch 17 is formed only by the second punching press die 100 </ b> B. You may do it. That is, the outer peripheral edge of the spur 10 includes a mountain-shaped portion 14, a valley portion 16, a mountain-shaped portion 14, a valley portion 16 having a notch portion 17 formed at the bottom, a mountain-shaped portion 14, a valley portion 16, a mountain-shaped portion 14, The order of formation is as follows: valley 16 having a notch 17 formed at the bottom, mountain-shaped portion 14, valley 16 and mountain-shaped portion 14, valley 16 having a notch 17 formed at the bottom, and so on. The chevron part 14, the valley part 16, and the notch part 17 can also be formed.

  Further, the bent portion 19 may be formed in the main body portion 12 as necessary. As shown in FIG. 1B, the bent portion 19 is bent in a direction in which the inner peripheral bent portion 19 approaches the outer peripheral surface of the sleeve portion 18, and the outer peripheral bent portion 19 A is It is bent in a direction away from the outer peripheral surface. The bent portion 19A at the position closest to the chevron portion 14 (outer peripheral side) is formed at a substantially central position in the axial direction (protruding direction) of the sleeve portion 18. That is, the mountain-shaped portion 14 is formed so as to be positioned at the center portion of the sleeve portion 18 in the axial direction. In the main body 12, the bending angles of the bent portions 19 and 19 </ b> A are appropriately adjusted so that the outer peripheral edge portion of the bent portion 19 </ b> A extends in a direction orthogonal to the axial direction of the sleeve portion 18.

Next, the manufacturing process of the spur 10 shown in FIGS. 1 and 2 will be described. 3-8 is a top view which shows the state in each manufacturing process. 4 to 8 show only the state of the upper right part shown in FIG. 3 in each manufacturing process, but the same processing is applied to the lower right part and the left part of the spur which are not shown. Of course.
First, as shown in FIG. 3, a lower punching process (also referred to as a roughing press process) for forming a sleeve portion 18 described later is performed at a required position of a thin stainless steel plate. In this undercut pressing, the through hole 11 (hatched portion) is formed at a required position where a larger outer peripheral portion can be formed than the part to be the final product. In the present embodiment, the through holes 11 are formed at three locations along the outer peripheral edge of the circular main body 12. The main body 12 is suspended by three hanging portions 11A.

  Next, in order to form the sleeve portion 18 in the out-of-plane direction of the main body 12 over a required range of the central portion of the main body 12, drawing is performed so that the central portion of the main body 12 forms a bottomed cylindrical shape. . Then, after the protruding height of the bottomed cylindrical portion at the center of the main body portion 12 reaches the required height dimension, the inner bottom portion of the bottomed cylindrical portion is punched to form the sleeve portion 18 that forms a cylindrical body. Subsequently, the outer portions of the main body portion 12 than the sleeve portion 18 are bent into a shallow dish shape by drawing to form bent portions 19 and 19A. In the present embodiment, the bent portions 19 and 19A are formed at two locations. The position of the bent portion 19A on the outer peripheral edge side of the main body portion 12 is a position corresponding to the substantially central position of the sleeve portion 18 in the axial direction of the sleeve portion 18 as shown in FIG. Further, the outer peripheral edge portion of the main body portion 12 with respect to the bent portion 19 </ b> A is bent in a direction orthogonal to the axis of the sleeve portion 18. Since the manufacturing process of this part is known, the state of each process is not shown. The state in which the sleeve portion 18 and the bent portions 19 and 19A are formed is shown in FIG.

Next, as shown in FIG. 4, the outer peripheral edge of the main body 12 is punched into a corrugated shape by using a lower punching die 200 </ b> A. The hatched portion in FIG. 4 is a portion to be punched and pressed. At this time, the chevron portion 15 formed on the outer peripheral edge of the main body portion 12 is formed at a position slightly outside the formation position of the chevron portion (not shown here) in the final shape of the spur. Has been. Further, at the time of this step, the tip portion of the chevron portion 15 is formed in an arc shape (so-called round shape).
Next, as shown in FIG. 5, the tip portion of the chevron portion 15 is pressed using a tip crushing press die 200B over a required range. In this pressing, as shown in FIG. 1 (B), the plate thickness (thickness) dimension is gradually increased from the central portion side of the main body portion 12 toward the tip portion of the mountain portion 15 (mountain portion 14). It is a forging press process for forming the taper part which becomes thin.

  Thereafter, as described above, punching press processing is performed twice so that the outer peripheral edge portion of the main body portion 12 of the spur 10 is formed into the angled portion 14 having a sharp shape. Specifically, using the first press die 100A shown in FIG. 10A, the first punching press process is performed as shown in FIG. The first press mold 100 </ b> A forms a ridge line that forms a portion that becomes the opposite ridge line portions 14 </ b> A and 14 </ b> A of every other valley portion 16 among the valley portions 16 spaced apart along the outer periphery of the main body portion 12. A part forming part 14X and a notch part forming part 17Z for forming the notch part 17 are formed (see FIG. 10A).

  The notch forming part 17Z is formed over a required range toward the radially inner side of the main body part 12. Since the ridge line portion forming portion 17Z in the present embodiment functions as a punched bite portion, the ridge line portion forming portion 17Z has a required area so as to improve the degree of biting of the punched residue to the die. Specifically, as shown in FIG. 10A, the notch portion forming portion 17Z formed between the adjacent ridge line portion forming portions 14X and 14X has a width dimension at the bottom of the notch portion forming portion 17 that is notched. The planar view shape which is more than the separation distance on the entrance side of the part forming part 17Z (between the intersections of the ridge line part forming parts 14X, 14X and the notch part forming part 17Z) is formed in a purse-like shape.

  After the first punching press process, the hatched portion in FIG. 6 is punched out. The notch portion forming portion 17Z formed in the first press die 100A also has a function as a punched bite portion, but the notch portion forming portion 17Z is omitted in the first press die 100A. There is no problem. This is because the punched residue generated by the first punching press process is large and has sufficient weight, so that the punched residue does not scatter from inside the die part (not shown) and jumps out of the die part. This is because it can be discharged (dropped).

  Next, using the second press mold 100B shown in FIG. 10, a second punching press process is performed as shown in FIG. As shown in FIG. 10C, the second press die 100B is punched in a state where the outer peripheral edge of the second press die 100B overlaps (coincides with) the outer peripheral edge of the first press die 100A. Press work.

As shown in FIG. 10B, the second press die 100B remains different from the opposing ridge line portions 14A and 14A in every other trough portion 16 punched out by the first press die 100A. A second ridge line portion forming portion 14Y that forms second ridge line portions 14B and 14B facing each other at every other valley portion 16 and a notch portion forming portion 17Z that forms a notch portion 17 are formed.
In the second press die 100B, the midway part of the second ridge line part forming part 14Y forms a required angle with respect to the midway part of the (first) ridge line part 14A formed by the first punching press process. It is formed in the shape of the mold which intersects in the state. In the second press die 100B, the disposition of the notch portion forming portion 17Z, which is a punched bite portion, is essential. The notch portion forming portion 17Z in the second press die 100B is also preferably formed in the same shape as the notch portion forming portion 17Z in the first press die 100A.
After the second punching press process is completed, a spur 10 (see FIG. 1 and FIG. 10 (D)) is finally obtained by punching and pressing a part (hatched part) of the hanging part 11A shown in FIG. Can be obtained.

The spur 10 formed in this way is formed on the surface of the printing paper because the tip of the chevron 14 formed on the outer peripheral edge of the main body 12 is formed with a straight line. Even if it does not leave a rolling trace on the surface of the printing paper, the printing paper can be discharged neatly.
The press dies 100A and 100B are each formed with a notch portion forming portion 17Z which is a punched bite portion for preventing scattering of the punched residue when performing punching press processing. As a result, it is possible to discharge the punched residue at the time of punching press processing to a predetermined position, and it is possible to prevent the occurrence of defective press due to mixing of the punched residue into the press working space where the punching press is performed. Therefore, it is very advantageous in that the spur 10 can be efficiently manufactured.

  As shown in FIG. 9, the spur 10 formed as described above is attached to the rotating shaft 30 with a required interval, whereby the driven roller 40 is formed. An engagement piece 32 is provided in advance at a predetermined position on the rotary shaft 30, and the spur 10 is brought to a predetermined position on the rotary shaft 30 by engaging the distal end portion of the sleeve portion 18 with the engagement piece 32 of the rotary shaft 30. Can be fixed. The driven roller 40 thus formed is disposed on the paper discharge side of the ink jet printer with the rotary shaft 30 orthogonal to the paper discharge direction. Further, another driven roller is arranged in such a manner as to face the driven roller 40 with the discharged printing paper interposed therebetween. Since the other driven rollers abut on the back surface (non-printing surface) of the printing paper, unlike the spur 10 mounted on the driven roller 40, a cylindrical roller body that contacts the printing paper with a required width has a rotating shaft. It is attached to.

The printing paper discharged by the driving roller in the ink jet printer passes between the driven roller 40 and the other driven rollers and is discharged to the outside. Further, the spur 10 inserted through the rotary shaft 30 rolls with the tip portion of the chevron 14 abutting against the printing paper because the chevron 14 is located at the center of the sleeve 18 in the axial direction. In this case, it rolls in an extremely stable state, and the paper discharge operation becomes smooth, and the printing surface of the printing paper can be prevented from being contaminated or damaged.
In addition, by attaching the light and inexpensive spur 10 in this embodiment to the driven roller 40, the moment of inertia of the driven roller 40 can be reduced. Thereby, the rotational torque required for the discharge drive roller is reduced, and a small discharge drive roller can be employed. As described above, the ink jet printer can be reduced in weight and can contribute to reduction of power consumption. It is also possible to provide an ink jet printer at a low cost.

  Although the spur according to the present invention and the data recording apparatus using the spur have been described above, the present invention is not limited to the above embodiments. For example, in the present embodiment, the notch portion forming portion 17Z that becomes the punched bite portion has a so-called drawstring shape in which the inner bottom surface is formed flat, but the inner bottom surface is not limited to the drawstring shape. Alternatively, it may be formed in an arc shape or other shapes. In short, when forming the chevron part 14 by two punching press processes, the punched part at the second punching press process with a few meat parts to be punched is transferred to the die part of the second press die 100B. It is only necessary that the second press die 100B is provided with a notch portion forming portion 17Z that can be reliably bitten (not scattered from the die portion). Therefore, the planar shape of the notch 17 is not particularly limited, and it is a matter of course that any planar shape belongs to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Spur 11 Through-hole 11A Hanging part 12 Main-body part 14 Mountain-shaped part 14A, 14B Ridge-line part 14X, 14Y Ridge-line part formation part 15 Mountain-shaped part 16 Valley part 17 Notch part 17Z Notch part formation part 18 Sleeve part 19, 19A Bending part 30 Rotating shaft 32 Engagement piece 40 Driven roller 100A, 100B Press die

Claims (3)

In the manufacturing method of the spur, which is alternately formed with chevron portions and valley portions on the outer periphery, contacts the surface of the recording medium, and rolls along with the transport operation of the storage medium.
A first punching step for forming a portion to be an opposite ridge line portion of every other valley portion;
A second punching step for forming a portion that becomes the opposite ridge line portion of every other valley portion,
A spur characterized in that the ridge line portion formed in the second punching step is formed so as to intersect the ridge line portion formed in the first punching step, and the top of the chevron portion is formed sharply. Manufacturing method.   2. The first punching step and the second punching step, wherein a notch portion having a required width and a shape wider on the back side than the inlet side is formed at the bottom of the valley portion. Of spur manufacturing.   The spur manufacturing method according to claim 1, further comprising a step of forming an outer peripheral portion larger than a spur to be formed before the first punching step.

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