หน่วยคัตเตอร์สำหรับตกแต่งปลายและเครื่องมือตกแต่งปลายแบบใช้มือ

Abstract

DEPCT66 หน่วยคัตเตอร์สำหรับตกแต่งปลายซึ่งมีความรู้สึกใช้งานได้สะดวกสบายที่สามารถระบาย ออกผงตัดซึ่งเกิดขึ้นในเวลาที่ตัดได้อย่างราบรื่นพร้อมทั้งสามารถทำให้อายุการใช้งานของคัตเตอร์ ตัดยาวนานขึ้นและเครื่องมือตกแต่งปลายแบบใช้มือซึ่งได้ใส่สิ่งนั้นหน่วยคัตเตอร์(3)ซึ่งติดตั้งไว้ ที่เครื่องมือตกแต่งปลายแบบใช้มือ(1)ประกอบด้วยตัวจับหมุน(6)และคัตเตอร์ตัด(7)ที่สามารถ ใส่เข้าถอดออกจากตัวจับหมุน(6)ได้ตัวจับหมุน(6)ประกอบด้วยส่วนรองรับปลาย(6c)ซึ่ง รองรับส่วนปลายสุด(11a)ของปลายอิเล็กโทรด(11)ในขณะที่ตัดและส่วนเจาะทะลุ(8)ซึ่งทะลุ ผ่านในทิศทางแกนหมุน(C1),ที่ผิวฝั่งด้านในของส่วนเจาะทะลุ(8)นั้นมีการติดตั้งคัตเตอร์ตัด(7) ไว้ในท่าทางซึ่งยืดไปในทิศทางแกนหมุน(C1)และทิศทางรัศมีของตัวจับหมุน(6)ที่ฝั่งอีกด้าน หนึ่งในทิศทางแกนหมุน(C1)ของส่วนเจาะทะลุ(8)นั้นมีการทำเป็นส่วนขอบเขตกว้าง(8a)ซึ่งมี การตั้งค่าไว้ที่ขนาดที่กว้างในทิศทางรัศมีของตัวจับหมุน(6)มากกว่าฝั่งด้านหนึ่งในทิศทางแกน หมุน(C1) -----------------------------------------------------------

Description

Tip dressing cutter unit and manual tip dresser

[0001] The present invention relates to a tip dressing cutter unit used to cut the front end of a spot welding electrode tip, and a manual tip dresser equipped with the cutter unit.

[0002] A conventional tip dresser, as disclosed in, for example, Patent Document 1, is manually operated by a user to cut the tip of a spot welding electrode tip, and includes a generally rod-shaped dresser body with a motor housed inside. One end of the dresser body is journaled with a cutter unit that rotates around its center line by the motor, while the other end of the dresser body forms a gripping portion that is held by the user. The cutter unit is composed of a short cylindrical rotating holder and a plate-shaped cutting cutter attached inside the rotating holder, and the cutting cutter is oriented to extend radially of the rotating holder so as to pass through the rotation axis of the rotating holder. A switch lever for starting and stopping the motor is rotatably provided on the other end of the dresser body, and the cutting cutter is brought into contact with the tip of the electrode tip from one end of the cutter unit with the central axis of the electrode tip aligned with the rotation axis, and when the user holds the grip and rotates the switch lever toward the grip, the cutter unit rotates and cuts the tip of the electrode tip with the cutting cutter. Chips generated during cutting pass through a through-hole provided between the inner circumferential surface of the rotating holder and the cutting cutter and are discharged from the other end of the cutter unit.

[0003] However, the cutter unit of Patent Document 1 is structured so that when cutting the tip of the electrode tip, only the cutting cutter comes into contact with the tip, and therefore repeated use places a heavy load on the cutting cutter, which may shorten its lifespan.

[0004] To address this issue, for example, as disclosed in Patent Document 2, it is conceivable to provide a concave tip receiving portion on the rotating holder to receive the tip of the electrode tip, so that the tip of the electrode tip comes into contact not only with the cutting cutter but also with the rotating holder during cutting.

[0005] JP 2006-212685 A International Publication No. 2013 / 061710

[0006] However, if a tip receiving portion is provided on the rotary holder, the through-hole for passing chips generated during cutting in the cutter unit becomes narrower, and the chips generated during cutting often get stuck inside the through-hole as they pass through. Therefore, the user must clean the through-hole every time the through-hole becomes clogged with chips and cutting work becomes impossible, which can make the tool uncomfortable to use.

[0007] The present invention has been made in consideration of the above points, and its purpose is to provide a cutter unit for tip dressing that is easy to use and can extend the life of the cutting cutter and smoothly discharge chips generated during cutting, as well as a manual tip dresser equipped with the same.

[0008] In order to achieve the above object, the present invention is characterized in that the shape of the penetration part in the cutter unit is devised.

[0009] Specifically, the target was a tip dressing cutter unit that includes a rotating holder that rotates around a rotation axis and a cutting cutter that is detachably attached to the rotating holder and cuts the tip of a spot welding electrode tip by the rotational movement of the rotating holder, and the following measures were taken.

[0010] That is, in the first invention, the rotating holder is provided on one side in the direction of the rotation axis, and is equipped with a tip receiving portion that receives the tip of the electrode tip during cutting, and a through portion that penetrates in the direction of the rotation axis and opens into the tip receiving portion, and on whose inner surface the cutting cutter is attached in a position that extends radially and in the direction of the rotation axis of the rotating holder, and is characterized in that a wide portion is provided on the other side in the direction of the rotation axis of the through portion that is set to a dimension that is wider radially of the rotating holder than on one side in the direction of the rotation axis.

[0011] In the second invention, in the first invention, the cutting cutter is attached to the rotating holder in a position extending radially outward from the rotation axis, and the wide portion is formed by making the dimension in the direction of the rotation axis of the other half of the rotating holder to which the cutting cutter is attached shorter than the dimension in the direction of the rotation axis of the other half of the rotating holder to which the cutting cutter is attached, with the mounting surface of the cutting cutter as the boundary.

[0012] In a third invention, in the first or second invention, the cutting cutter is plate-shaped and has a screw insertion hole that penetrates in the thickness direction of the plate, and is attached to the rotating holder by threading a screw inserted into the screw insertion hole into the rotating holder, and the screw insertion hole is provided at a position corresponding to the wide portion.

[0013] In a fourth invention, a manual tip dresser includes a tip dressing cutter unit according to any one of the first to third inventions, a dresser body having one end that rotatably supports the cutter unit around the rotation axis and the other end that has a grip that a user holds during operation, a motor that is provided inside the dresser body and rotates the cutter unit, and a switch lever that is rotatably supported on the other side of the dresser body and that starts the motor when rotated toward the grip and stops the motor when rotated away from the grip.

[0014] In the first invention, when cutting the tip of the electrode tip, the cutting cutter cuts the tip of the electrode tip while the tip is received by both the tip receiving portion of the rotary holder and the cutting cutter. Therefore, the load on the cutting cutter during cutting is reduced compared to cutter units with a structure such as that of Patent Document 1, thereby extending the life of the cutting cutter. Furthermore, because the width of the through hole increases with increasing distance from the cutting location, even if the movement of chips decreases with increasing distance from the cutting location, chips are less likely to become clogged inside the through hole. Therefore, the number of times the through hole needs to be cleaned is reduced, resulting in a more comfortable usability.

[0015] In the second aspect of the present invention, the area on the other side in the direction of the rotation axis of the through-hole can be widened relatively easily, so that a low-cost cutter unit can be produced.

[0016] In the third aspect of the present invention, when the cutting cutter is attached to the rotary holder, the head of the screw is positioned in the wide portion of the through-hole. Therefore, even if chips come into contact with the head of the screw as they pass through the through-hole, they are less likely to become trapped between the inner circumferential surface of the through-hole and the head of the screw, and chips that are generated can be reliably discharged outside the cutter unit.

[0017] In the fourth aspect of the present invention, the user can start and stop the rotation of the cutter unit while holding the tip dresser with one hand, making the device easy to use.

[0018] Fig. 3 is a perspective view of a manual tip dresser according to an embodiment of the present invention. Fig. 4 is a view taken along an arrow II in Fig. 1. Fig. 5 is an exploded perspective view of a cutter unit according to an embodiment of the present invention. Fig. 6 is a view taken along an arrow IV in Fig. 3. Fig. 7 is a view taken along an arrow V in Fig. 3. Fig. 8 is a cross-sectional view taken along line IV-IV in Fig. 3.

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: FIG.

[0020] 1 shows a manual tip dresser 1 according to an embodiment of the present invention. The manual tip dresser 1 is used to cut the tip 11a of an electrode tip 11 (see FIG. 6) fitted into the shank of a spot welding gun (not shown), and includes a metal dresser body 2 having a thick plate-like shape on one longitudinal half and a cylindrical shape on the other longitudinal half.

[0021] A pair of circular openings 2 a facing each other are formed on both sides in the thickness direction on one longitudinal side of the dresser body 2 so as to communicate with the interior of the dresser body 2 .

[0022] Between the openings 2 a, a generally disk-shaped cutter unit 3 made of metal is supported rotatably about a rotation axis C1 extending in the thickness direction of the dresser body 2 .

[0023] On the other hand, the other longitudinal side of the dresser body 2 is a gripping portion 2b that the user holds when operating the dresser body 2, and inside the gripping portion 2b is housed a motor 4 that rotates and drives the cutter unit 3 via a gear meshing mechanism (not shown).

[0024] A switch lever 5 in the shape of an elongated strip is provided on the side of the grip portion 2b of the dresser body 2, and one end of the switch lever 5 is rotatably supported on the other end of the dresser body 2.

[0025] The switch lever 5 is configured to start the motor 4 when rotated toward the grip portion 2b, and to stop the motor 4 when rotated away from the grip portion 2b, and is biased toward the direction away from the grip portion 2b by a biasing member not shown.

[0026] As shown in Figures 2 and 3, the cutter unit 3 includes a rotating holder 6 that is approximately C-shaped in plan view and whose center line coincides with the rotation axis C1, and a cutting cutter 7 that is detachably attached to the rotating holder 6.

[0027] The rotary holder 6 has a notch 6a that gradually widens in the circumferential direction around the rotation axis C1 as it moves radially outward from the rotation axis C1, opening outward and also opening to both sides in the direction of the rotation axis C1.

[0028] A flange portion 6b having a generally barrel shape in plan view is formed on the peripheral edge portion of the rotary holder 6 on one side in the direction of the rotation axis C1 and extending outward more than the remaining portion.

[0029] Further, on one surface of the rotary holder 6 in the direction of the rotation axis C1, a tip receiving portion 6c is formed, the diameter of which gradually decreases toward the center of the rotary holder 6.

[0030] The shape of the tip receiving portion 6c corresponds to the curved shape of the tip 11a of the electrode tip 11, and is capable of receiving the tip 11a of the electrode tip 11 with the central axis of the electrode tip 11 aligned with the rotation axis C1.

[0031] The tip receiving portion 6c has a plurality of arc-shaped stepped surfaces 6e extending from the rotation axis C1 as a center, and the stepped surfaces 6e are formed in a continuous, stepped pattern toward the rotation axis C1. That is, each stepped surface 6e is composed of a horizontal portion 6f extending horizontally and a vertical portion 6g extending vertically, and the connecting portion 6h between the horizontal portion 6f and the vertical portion 6g has a sharp, perpendicular cross section. Each connecting portion 6h contacts the tip end 11a of the electrode tip 11 when the tip receiving portion 6c receives the tip end 11a. The rotating holder 6 according to the embodiment of the present invention is designed so that each connecting portion 6h contacts the surface of the tip end 11a of the electrode tip 11 both when a φ13 electrode tip 11 is received by the tip receiving portion 6c and when a φ16 electrode tip 11 is received by the tip receiving portion 6c.

[0032] One inner surface of the notch 6a extending outward from the rotation axis C1 is formed with a mounting surface 6d that is recessed in a stepped shape that is approximately T-shaped in side view and serves as a position for mounting the cutting cutter 7.

[0033] The rotating holder 6 has one half of the rotating holder 6 on which the cutting cutter 7 is attached, separated by the mounting surface 6d, as region 6A, while the other half is region 6B.The dimension of region 6B in the direction of the rotation axis C1 is shorter than that of region 6A, and a space S1 is formed on the other side of region 6B in the direction of the rotation axis C1.

[0034] That is, the cutout portion 6a and the space S1 constitute the through portion 8 of the present invention, which penetrates in the direction of the rotation axis C1 and opens into the tip receiving portion 6c, and on the other side of the through portion 8 in the direction of the rotation axis C1, there is provided a wide portion 8a which is set to a dimension wider in the radial direction of the rotating holder 6 than on one side in the direction of the rotation axis C1.

[0035] As shown in FIGS. 3 to 5, the cutting cutter 7 is formed by cutting out a metal plate into a substantially T-shape, and has a shape corresponding to the mounting surface 6d.

[0036] On the other side of the cutting cutter 7 in the direction of the rotation axis C1, a screw insertion hole 7a is formed that penetrates in the plate thickness direction, and the cutting cutter 7 is placed against the mounting surface 6d and attached to the rotating holder 6 by threading a screw 10 that is inserted through the washer 9 and the screw insertion hole 7a in turn into the rotating holder 6.

[0037] That is, the screw insertion hole 7a is provided at a position corresponding to the wide portion 8a of the present invention.

[0038] When attached to the rotary holder 6, the cutting cutter 7 is oriented so as to extend radially outward from the rotary holder 6 and in the direction of the rotation axis C1.

[0039] One plate surface of the cutting cutter 7 faces the mounting surface 6d, while the other plate surface forms a scooping surface portion 7b, which extends so as to intersect with the circumferential direction around the rotation axis C1.

[0040] A relief surface 7c is provided on one side of the rake surface 7b in the direction of the rotation axis C1, and is substantially perpendicular to the rake surface 7b.

[0041] The relief surface portion 7c has a curved shape that gradually becomes more positioned on one side in the direction of the rotation axis C1 as it moves away from the rotation axis C1.

[0042] The relief surface portion 7c has a shape corresponding to the tip receiving portion 6c when the cutting cutter 7 is attached to the rotating holder 6, and when it is brought close to the electrode tip 11 with its central axis aligned with the rotation axis C1, it faces the tip portion 11a of the electrode tip 11.

[0043] A pair of positioning recesses 7d, which are cut out in a rectangular shape in side view, are formed in the upper and lower parts of the cutting cutter 7 on the side farther from the rotation axis C1.

[0044] A cutting edge 7e is formed at the connecting portion between the rake face 7b and the flank face 7c, and extends so as to intersect with the rotation axis C1.

[0045] When the electrode tip 11, with its central axis aligned with the rotation axis C1, is brought into contact with the rotating holder 6 in a rotating state, the cutting cutter 7 comes into contact with the tip 11a of the electrode tip 11, and the tip 11a is cut by the cutting edge portion 7e, generating chips M1.

[0046] Next, the operation of cutting the tip 11a of the electrode tip 11 using the manual tip dresser 1 will be described.

[0047] First, the user grasps the gripping portion 2b of the manual tip dresser 1, and as shown in Figures 4 and 5, moves the manual tip dresser 1 to receive the tip portion 11a of the electrode tip 11 attached to a shank (not shown) on the tip receiving portion 6c of the rotating holder 6 so that the central axis of the electrode tip 11 coincides with the rotation axis C1.

[0048] Next, the user grips the switch lever 5 together with the grip portion 2b so that the switch lever 5 rotates toward the grip portion 2b. This starts the motor 4, causing the cutter unit 3 to rotate about the rotation axis C1, and the cutting blade portion 7e of the cutting cutter 7 contacts the tip portion 11a of the electrode tip 11 to cut the tip portion 11a. In this manner, when cutting the tip portion 11a of the electrode tip 11, the cutting cutter 7 cuts the tip portion 11a of the electrode tip 11 while the tip portion 11a of the electrode tip 11 is received by both the tip receiving portion 6c of the rotating holder 6 and the cutting cutter 7. Therefore, the load on the cutting cutter 7 during cutting is reduced compared to a cutter unit with a structure such as that of Patent Document 1, thereby extending the life of the cutting cutter 7.

[0049] When the cutting edge portion 7e of the cutting cutter 7 cuts the tip portion 11a of the electrode tip 11, each continuous portion 6h having a sharp cross section on the stepped surface portion 6e of the tip receiving portion 6c comes into contact with the tip portion 11a of the electrode tip 11. When the rotating holder 6 rotates in this state, each continuous portion 6h catches on the tip portion 11a of the electrode tip 11 in a direction intersecting with the central axis and guides the rotation of the rotating holder 6 relative to the tip portion 11a of the electrode tip 11. Therefore, during cutting work, the tip portion 11a of the electrode tip 11 does not slide relative to the tip receiving portion 6c in a direction intersecting with the central axis when the rotating holder 6 rotates, preventing the rotation axis C1 from shifting from the central axis of the electrode tip 11, thereby stabilizing the cutting operation of the cutting cutter 7. In addition, the contact area between the tip 11a of the electrode tip 11 and the tip receiving portion 6c is reduced, and the amount of penetration of the cutting edge portion 7e into the tip 11a of the electrode tip 11 when the rotating holder 6 is rotated increases, thereby improving the cutting ability of the cutting cutter 7 and enabling the tip 11a of the electrode tip 11 to be cut efficiently.

[0050] When the cutting edge portion 7e of the cutting cutter 7 cuts the tip portion 11a of the electrode tip 11, chips M1 are generated in the notch portion 6a, as shown in Figure 4. These chips M1 move from the notch portion 6a to a space S1 (wide portion 8a) that is wider than the notch portion 6a, and are then discharged to the outside of the cutter unit 3. In other words, since the width of the through portion 8 of the embodiment of the present invention increases with increasing distance from the cutting location, even if the movement of the chips M1 decreases with increasing distance from the cutting location, the chips M1 are unlikely to become clogged inside the through portion 8. This reduces the number of times the through portion 8 needs to be cleaned, resulting in a more comfortable usability.

[0051] The space S1 is formed by making the dimension in the direction of the rotation axis C1 of the region 6B on one side of the rotating holder 6 to which the cutting cutter 7 is attached shorter than the dimension in the direction of the rotation axis C1 of the region 6A on the other side of the rotating holder 6, with the mounting surface 6d of the cutting cutter 7 as the boundary. Therefore, it is relatively easy to process the region on the other side in the direction of the rotation axis C1 at the through-hole 8, and a low-cost cutter unit 3 can be produced.

[0052] Furthermore, because the screw insertion hole 7a of the cutting cutter 7 is provided at a position corresponding to the wide portion 8a, when the cutting cutter 7 is attached to the rotary holder 6, the head 10a of the screw 10 is positioned at the wide portion 8a of the through-hole 8. Therefore, even if the chips M1 come into contact with the head 10a of the screw 10 as they pass through the through-hole 8, they are less likely to become caught between the inner circumferential surface of the through-hole 8 and the head 10a of the screw 10, and the chips M1 that are generated can be reliably discharged to the outside of the cutter unit 3.

[0053] After performing cutting work for a predetermined time, the user releases the switch lever 5 and rotates the switch lever 5 away from the grip portion 2b to stop the motor 4 and finish cutting the distal end 11a of the electrode tip 11. In this way, the manual tip dresser 1 according to the embodiment of the present invention allows the user to start and stop the rotation of the cutter unit 3 while holding the grip portion 2b with one hand, making it an easy-to-use device.

[0054] In the embodiment of the present invention, the wide portion 8a of the through-hole 8 is formed by making the dimension in the direction of the rotation axis C1 of the region 6B on one side of the rotating holder 6 to which the cutting cutter 7 is attached shorter than the dimension in the direction of the rotation axis C1 of the region 6A on the other side of the rotating holder 6, with the mounting surface 6d of the cutting cutter 7 as the boundary. However, the rotating holder 6 may be formed in another shape so that the other side region of the through-hole 8 in the direction of the rotation axis C1 has a wider dimension.

[0055] Furthermore, although the cutter unit 3 of the present invention is mounted on the manual tip dresser 1, it can also be mounted on an automatic tip dresser.

[0056] The present invention is suitable for a tip dressing cutter unit used to cut the front end of a spot welding electrode tip, and a manual tip dresser to which the cutter unit is attached.

[0057] REFERENCE SIGNS LIST 1 Manual tip dresser 2 Dresser body 2b Grip portion 3 Cutter unit 4 Motor 5 Switch lever 6 Rotating holder 6c Tip receiving portion 6d Mounting surface 7 Cutting cutter 7a Screw insertion hole 8 Penetration portion 8a Wide portion 10 Screw 10a Head portion 11 Power tip 11a Tip portion C1 Rotation axis