JP2011194839A - Carrying structure of writing utensil shaft cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damages or the like caused by clashing between members or between a member and a straight feeder guiding member when a writing utensil shaft cylinder is hung to be carried by the straight feeder.SOLUTION: The writing utensil shaft cylinder 101 is hung to be carried by the plate guide 6 of a straight feeder 1. An annular projection 108 is formed in the writing utensil shaft cylinder 101, and a corner (opposite surface corner) facing the plate guide is R-chamferred. The writing utensil shaft cylinder 101 is hung by abutment between the annular projection 108 and the corner (opposite surface corner) of the plate guide. The abutted part is point or line contact.

Description

  The present invention relates to a conveyance structure of a writing instrument barrel in an automatic writing instrument assembly machine.

  2. Description of the Related Art Conventionally, in a writing instrument automatic assembly machine, a structure is disclosed in which a writing instrument is suspended between guide rails, conveyed by vibration of a linear feeder, etc., and parts are supplied.

JP2000-158884

  In the above-described writing instrument component conveying structure, the contact between the annular protrusion (step 3) provided on the shaft cylinder and the guide rail is in contact with each other. Therefore, when a linear feeder that transports parts due to the occurrence of vibrations is used, frictional resistance is generated by contact between the flat surfaces, and transport is performed with stronger vibration. Then, in a writing cylinder shaft which is a relatively long cylindrical part, a swing occurs in a pendulum motion particularly in the feeding direction, and parts are likely to collide with each other, so that damage or the like is likely to occur.

  The present invention conveys the writing instrument shaft, the writing tool shaft, the annular protrusion provided on the outer periphery in the vicinity of the end of the writing tool shaft, and the arcuate section formed in an arcuate section. The linear feeder, the plate guide provided on the linear feeder and formed in a plate shape, and opposed to each other with a predetermined interval, and the writing instrument shaft cylinder are formed by the opposing surfaces of the plate guide During the predetermined interval, the annular projection is conveyed by being suspended by being brought into contact with a corner portion of the opposing surface of the plate-shaped guide which is chamfered, and is conveyed. Structure.

  According to the present invention, for conveyance of a writing instrument shaft cylinder in an automatic assembly machine, contact between the writing instrument shaft cylinder and a plate-shaped guide serving as a guide rail is determined by using an R surface chamfered opposing corner portion and a shaft of the plate-shaped guide. It can be formed by a protrusion having an arcuate cross section of the cylinder. Therefore, the contact portion is formed in a line shape or a dot shape. Therefore, compared to the conventional surface contact, there is less resistance due to friction at the contact portion, and the occurrence of vibration of the linear feeder can be reduced, so it is possible to prevent scratches due to contact during conveyance of the writing instrument shaft cylinder. .

An overall view of a linear feeder in an automatic assembly machine is shown. It is a figure which shows the assembly completion state of a writing instrument, (a) is a side view, (b) is a longitudinal cross-sectional view. It is a front view of the axial cylinder for writing instruments which is a conveyed article of a linear feeder. It is an expanded sectional view showing the important section of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the forward direction in the description of the writing instrument refers to the direction of the pen tip side.

  FIG. 1 shows an overall view of a linear feeder 1 for a writing instrument shaft 101 in an automatic assembly machine. The linear feeder 1 constitutes a part of an automatic assembly machine, and the writing instrument shaft 101 is supplied from a parts feeder (not shown) via a chute or the like (reference S), and the handling means 50 clamps the writing instrument shaft 101. To the clamping position 50a. The handling means 50 clamps the writing instrument shaft 101 at the clamp position 50a by the clamping / unclamping operation of the finger 50b, and sequentially carries it out to the assembly process.

  The rectilinear feeder 1 is fixed on the gantry 2 via a base plate 3 and a vibration isolator 3a. Note that other devices (handling means 50 and the like) in the automatic assembly machine are also fixed to the gantry 2 in common. The base plate 3 is provided with a linear drive device 4 serving as a vibration generation source. A plate-like portion 4 a is fixed to the upper part of the linear drive device 4. And on this plate-shaped part 4a, two support | pillars 5 are standingly arranged facing two sets. In this embodiment, three groups (six) are erected. And the plate-shaped guide 6 formed in plate shape over the adjacent support | pillar 5 is provided facing (6a, 6b). The plate-like guide 6 (6a, 6b) is set at an interval enough to suspend the writing instrument shaft tube 101. The height direction is also set to a height that allows the writing instrument barrel 101 to be conveyed as appropriate.

  The gate means 7 is provided on the exit side (handling means 50 side) of the plate-like guide 6 (6a, 6b) in the transport direction (feed direction FD). The gate means 7 has a gate portion 7a closed in a steady state. When the writing instrument shaft cylinder 101 is clamped and pulled out of the plate-like guide 6 (6a, 6b) by the handling means 50, the gate portion 7a is opened by contacting the writing instrument shaft cylinder 101. Yes. Thereby, even when the linear drive device 4 is vibrating, the writing instrument shaft cylinder 101 can be discharged one by one without being dropped until it is clamped and pulled out by the handling means 50.

  The upstream side of the plate-like guide 6 (6a, 6b) in the feed direction FD is connected to a not-shown parts feeder or the like via a chute (reference S), and the writing instrument shaft cylinder 101 is supplied as needed. The radial direction of the writing instrument barrel 101 is supplied so that a clip 102 (see FIG. 2) of a writing instrument, which will be described later, faces in the feeding direction or the direction opposite to the feeding direction with respect to the feeding direction FD. 2) is suspended by engagement with the plate-like guide 6 (6a, 6b).

  Further, a plate 4b having a predetermined length is provided on the handling means 50 side of the plate-like portion 4a (in other words, on the exit side in the feed direction FD) in parallel with the feed direction FD of the writing instrument barrel 101. . The plate 4b is set so as to come into contact with the lower end portion of the writing instrument shaft cylinder 101 when suspended at the upstream end portion. Thereby, on the plate 4b, the writing instrument shaft cylinder 101 is conveyed in the vicinity of the gate means 7 with the upper end side of the writing instrument shaft cylinder 101 inclined toward the outlet side. Furthermore, the end of the plate 4b is set so that the inclination of the writing instrument shaft cylinder 101 is released at the position of the gate means 7, and only the writing instrument shaft cylinder 101 to be discharged next is returned to an upright state by suspension. Thus, since the space 50c is secured by the inclination of the writing instrument shaft cylinder 101 (101a) at the next position, when the finger 50b of the handling means 50 clamps the writing instrument shaft cylinder 101 at the clamp position 50a, It is possible to prevent the writing instrument shaft 101 (101a) at the next position from interfering.

  FIG. 2 shows an overall view of a ballpoint pen as an example of the writing instrument 100 assembled by an automatic assembly machine. 2A shows a front view of the entire writing instrument 100, and FIG. 2B shows a longitudinal sectional view of the writing instrument 100. FIG. In brief, the writing instrument shaft cylinder 101 of the writing instrument 100 is integrally formed with a clip 102 at the rear, and a grip 103 is provided at the gripping portion. The grip 103 is integrally formed with the writing instrument shaft 101 by two-color molding. In addition, a front end 104 is connected and fixed to the distal end portion of the writing instrument shaft 101 by screwing.

  Further, the writing instrument shaft 101 has a built-in ballpoint pen refill 105, and the ballpoint pen refill 105 is inserted into the front end 104 of the front end 104 by a knock mechanism 107 including an urging member 106, a rotor, a middle piece, and the like. It is formed so that it can appear and disappear.

  The writing instrument shaft cylinder 101 is provided with an annular protrusion 108 on the outer periphery near the rear end. The cross section (see FIG. 2B) of the annular protrusion 108 is formed in an arc shape. The annular projection 108 is formed around the writing instrument shaft 101 so as to avoid the clip 102.

  FIG. 3 is a front view of the writing instrument barrel 101 viewed from the clip 102 side. The writing instrument shaft cylinder 101 is formed in a substantially cylindrical shape as a whole. The front end portion of the writing instrument barrel 101 is formed with a male screw portion 109 that realizes screw connection with the front end 104. The rear end portion of the writing instrument shaft cylinder 101 is formed in a corrugated shape 110 with the end surface around the axis.

  FIG. 4 is an enlarged view of a main part of the plate-like guide 6 (6a, 6b) and the writing instrument shaft cylinder 101 which are the gist of the present invention. The plate-like guide 6 (6a, 6b) has R-chamfered corner portions (facing surface corner portions) 6a2, 6b2, which are in contact with the annular protrusions 108 of the facing surfaces 6a1, 6b1 facing each other. ing. On the other hand, the annular protrusion 108 is formed in a circular arc shape as described above. Therefore, the contact portions between the corners (opposite surface corners) 6a2 and 6b2 and the annular protrusion 108 are in point contact. Accordingly, the frictional resistance between the corners (opposite surface corners) 6a2 and 6b2 and the contact portion between the annular protrusions 108 is greatly reduced as compared with the case of surface contact. ) Can be reduced, the writing instrument barrel 101 can be smoothly fed. Further, since the vibration of the linear feeder 1 is small, the pendulum movement along the feeding direction FD of the writing instrument barrel 101 is less likely to occur during conveyance, and collision between members of the writing instrument spindle 101 can be prevented. Therefore, the damage | wound etc. during conveyance of the linear feeder 1 of the axial cylinder 101 for writing instruments can be prevented. According to the present invention, it is possible to reduce the defect occurrence rate for the writing instrument barrel 101 that requires high quality as an exterior part.

  Further, since the corners (opposite surface corners) 6a2 and 6b2 are R chamfers, corners that may damage the writing instrument shaft tube 101 do not appear as compared to C chamfering. Even if the cylinder 101 and the plate-like guide 6 (6a, 6b) collide with each other, it is possible to contribute to the production of a higher quality writing instrument 100 having no scratches.

  Furthermore, in the present embodiment, the radius 108r of the circular arc 108 in the annular projection 108 is set to be twice the radius 6R in the corners (opposing surface corners) 6a2 and 6b2. As a result, as shown in FIG. 4, the lower surface 108a of the annular protrusion 108 is more than the upper surfaces 6a3, 6b3 of the plate guides 6a, 6b while maintaining a predetermined gap W between the plate guides 6a, 6b and the writing instrument shaft 101. The writing instrument shaft cylinder 101 is suspended in a slightly lowered state (gap G). As a result, the writing instrument shaft cylinder 101 is stably conveyed without lateral shaking from side to side. Therefore, since the gap W is maintained even during the conveyance, it is possible to prevent the writing instrument shaft tube 101 from being damaged by colliding with the plate guides 6a and 6b.

  The plate-like guides 6a and 6b are preferably made of a metal material (steel material) as compared with a resin material. This is because the contact portions between the corner portions 6a2 and 6b2 and the annular protrusion 108 are point contacts, so that the surface pressure of the contact portions is increased and the plate guides 6a and 6b are worn. More preferably, the plate-like guides 6a and 6b are preferably subjected to surface hardening treatment. By using the harder plate-like guides 6a and 6b, it is possible to reduce wear of the contact portion with the annular protrusion 108. As the surface hardening treatment, various surface hardening treatments such as nitriding treatment, salt bath soft nitriding treatment, gas nitriding treatment, and composite electrolytic plating treatment can be applied.

  In addition, when the shape of the writing instrument shaft cylinder 101 is a rectangular cylinder or the like, the annular protrusion 108 can be formed along the outer periphery thereof. In this case, there is a portion where the annular protrusion 108 is continuously formed linearly. Therefore, the contact portions between the corner portions (opposite surface corner portions) 6a2 and 6b2 and the annular protrusion 108 are in line contact, but the frictional resistance can be reduced as compared with the surface contact.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to this, In the range which does not change the summary of this invention, it can change suitably. For example, the linear feeder is a linear drive, but a system using a combination of an electromagnetic coil and a leaf spring may be used. Moreover, the circular arc shape of the annular protrusion 108 may be formed in an arc shape only at the contact portion with the corner portions 6a2 and 6b2.

DESCRIPTION OF SYMBOLS 1 Rectilinear feeder 2 Base 3 Base plate 3a Vibration isolator 4 Linear drive device 4a Plate-shaped part 4b Plate 5 Support | pillar 6 Plate-shaped guide 6a, 6b Plate-shaped guide 6a1, 6b1 Opposite surface 6a2, 6b2 Corner | angular part (opposite surface corner | angular part)
6a3, 6b3 Upper surface 6R Radius 7 Gate means 7a Gate section 50 Handling means 50a Clamping position 50b Finger 100 Writing instrument 101 Writing instrument shaft cylinder 102 Clip 103 Grip 104 Tip opening 105 Ball pen refill 106 Energizing member 107 Knock mechanism 108 Annular protrusion 108a Lower surface 108r Radius 109 Male screw part 110 Waveform shape

Claims (3)

A writing cylinder formed in a substantially cylindrical shape;
An annular protrusion provided on the outer periphery of the end portion of the writing instrument shaft, and having a circular arc shape in cross section;
A rectilinear feeder for conveying the writing instrument shaft;
A plate-shaped guide provided on the linear feeder, formed in a plate shape, and opposed to each other with a predetermined interval;
The writing instrument shaft cylinder is suspended by contacting the annular projection with the corner portion of the opposing surface of the plate-shaped guide having the chamfered shape, during a predetermined interval formed by the opposing surface of the plate-like guide. It is conveyed by this, The conveyance structure of the axial cylinder for writing instruments characterized by the above-mentioned. 2. The writing tool according to claim 1, wherein a cross-sectional radius of the annular projection formed in a circular arc shape is a radius twice as large as an R chamfer radius of a corner portion of the opposing surface of the plate guide. Conveying structure of shaft cylinder. The transport structure according to claim 1, wherein the plate-like guide is subjected to a surface hardening process.

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