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DE-102025138384-A1 - RECIRCULATED CUTTING TOOL

DE102025138384A1DE 102025138384 A1DE102025138384 A1DE 102025138384A1DE-102025138384-A1

Abstract

A reciprocating cutting tool (1) has a cutting blade holder (32) to which a cutting blade (34) can be removably attached. The cutting blade holder (32) is reciprocating. The cutting blade holder (32) has a first pressing element (130) that is movable towards or away from the cutting blade (34) to press the cutting blade (34), a first preloading element (134) that preloads the first pressing element (130), a second pressing element (142) that can press the cutting blade (34) in a direction different from the direction in which the first pressing element (130) presses the cutting blade (34), and a second preloading element (144) that preloads the second pressing element (142). The first pressing component (130) automatically presses the cutting blade (34) when the second pressing component (142) is pressed through the cutting blade (34). The first preloading component (134) is positioned such that it is not in the direction of movement of the first pressing component (130).

Inventors

  • Norito Chikusa
  • Wataru Ogasawara

Assignees

  • MAKITA CORPORATION

Dates

Publication Date
20260513
Application Date
20250923
Priority Date
20241111

Claims (11)

  1. Reciprocating cutting tool (1), comprising: a cutting blade holder (32) to which a cutting blade (34) can be removably attached, the cutting blade holder (32) being movable back and forth, and the cutting blade holder (32) comprising: a first pressing element (130) movable towards or away from the cutting blade (34) for pressing the cutting blade (34), a first preloading element (134) configured to preload the first pressing element (130), a second pressing element (142) configured to press the cutting blade (34) in a direction different from the direction in which the first pressing element (130) presses the cutting blade (34), and a second preloading element (144) configured to preload the second pressing element (142), at the first pressing component (130) automatically presses the cutting blade (34) when the second pressing component (142) is pressed through the cutting blade (34), and the first preloading component (134) is positioned in such a way as to avoid being in a direction of movement of the first pressing component (130).
  2. Reciprocating cutting tool (1) according Claim 1 , wherein the second pressing component (142) is movable in a direction in which the cutting blade holder (32) is movable back and forth, the first pressing component (130) is movable in a direction perpendicular to a direction of movement of the second pressing component (142), and the first preloading component (134) is offset from the first pressing component (130) in the direction in which the cutting blade holder (32) is movable back and forth.
  3. Reciprocating cutting tool (1) according Claim 1 or 2 , in which the first preloading component (134) is a torsion spring, and the second pressure component (142) is located radially inwards from the first preloading component (134).
  4. Reciprocating cutting tool (1) according to one of the Claims 1 until 3 , in which the cutting blade holder (32) has a sleeve (132) which is rotatable about a direction in which the cutting blade holder (32) is movable back and forth, and the first pressing component (130) and the first preloading component (134) are located radially inside the sleeve (132).
  5. Reciprocating cutting tool (1) according Claim 4 , wherein the sleeve (132) has an inner surface having a cam surface (132C), and the first pressing component (130) moves along the cam surface (132C) to move in response to the rotation of the sleeve (132).
  6. Reciprocating cutting tool (1) according Claim 4 or 5 , wherein the second pressing component (142) extends in the direction in which the cutting blade holder (32) can be moved back and forth, the second pressing component (142) has an engagement area (142F), the sleeve (132) has a receiving area (132G), and the engagement area (142F) engages with the receiving area (132G) to stop a rotation of the sleeve (132).
  7. Reciprocating cutting tool (1) according Claim 6 , wherein when the engagement area (142F) is engaged with the receiving area (132G), the sleeve (132) allows the first pressing component (130) to move to a position where the first pressing component (130) does not press the cutting blade (34), and when the engagement area (142F) is unlocked from the receiving area (132G), the sleeve (132) causes the first pressing component (130) to move to a position where the first pressing component (130) presses the cutting blade (34).
  8. Reciprocating cutting tool (1) according Claim 6 or 7 , in which the second pressing component (142) has a pressing area (142P), and a tongue (142T) which integrally connects the engagement area (142F) and the pressing area (142P), and when the pressing area (142P) is pressed through the cutting blade (34), the engagement area (142F) moves out of the receiving area (132G).
  9. Reciprocating cutting tool (1) according Claim 8 , wherein the tongue (142T) and the pressing area (142P) extend in a direction in which the cutting blade holder (32) is movable back and forth, and the tongue (142T) is offset from an imaginary center line of the pressing area (142P) in a direction perpendicular to the direction in which the cutting blade holder (32) is movable back and forth.
  10. Reciprocating cutting tool (1), with a cutting blade holder (32) to which a cutting blade (34) can be removably attached, wherein the cutting blade holder (32) can move back and forth. is removable and the cutting blade holder (32) a sleeve (132) which is rotatable about a direction in which the cutting blade holder (32) is movable back and forth, wherein the sleeve (132) has a receiving area (132G), a first pressing element (130) which is located radially inward from the sleeve (132) and is movable in response to a rotation of the sleeve (132), wherein the first pressing element (130) is movable toward or away from the cutting blade (34) to press the cutting blade (34), a first preloading element (134) which is located radially inward from the sleeve (132), wherein the first preloading element (134) is configured to preload the first pressing element (130), a second pressing element (142) which is configured to press the cutting blade (34) in the direction in which the cutting blade holder (32) is reciprocating, wherein the second pressing element (142) has an engagement area (142F) that can engage with the receiving area (132G) to stop the rotation of the sleeve (132), a pressing area (142P) that extends in the direction in which the cutting blade holder (32) is reciprocating, and a tongue (142T) that integrally connects the engagement area (142F) and the pressing area (142P) and extends in the direction in which the cutting blade holder (32) is reciprocating, wherein the tongue (142T) is offset from an imaginary center line of the pressing area (142P) in a direction perpendicular to the direction in which the cutting blade holder (32) is reciprocating, and a second preloading element (144) configured to to pre-tension the second pressing component (142) in which, when the pressing area (142P) is pressed through the cutting blade (34), the engagement area (142F) moves out of the receiving area (132G).
  11. Reciprocating cutting tool (1) according to one of the Claims 1 until 10 , wherein the cutting blade (34) is attached to the cutting blade holder (32) and has an imaginary center line extending in a direction in which the cutting blade (34) extends, the cutting blade holder (32) has an imaginary center line extending in a direction in which the cutting blade holder (32) extends, and the imaginary center line of the cutting blade (34) attached to the cutting blade holder (32) is offset from the imaginary center line of the cutting blade holder (32) in the direction of the first pressing component (130) in a direction perpendicular to the direction in which the cutting blade holder (32) is reciprocating.

Description

BACKGROUND 1. Technical field The present disclosure relates to a reciprocating cutting tool, such as a jigsaw or a saber saw. 2. State of the art A well-known jigsaw is in the JP 2002 - 254 403 A (Patent literature 1) revealed. A jigsaw 10 described in patent literature 1 has a clamp 26 for a cutting blade 22. The clamp 26 has a sleeve 33 that rotates between an unlocked and a locked position to change the cutting blade 22. The sleeve 33 is biased in one direction of rotation by a helical spring 44. In the locked position, the clamp 26 holds the cutting blade 22 between a pin 42, which is pressed by a cam 33c in the sleeve 33, and a wall surface 37j of a slot 37a on a rod 37. The helical spring 44 is located radially outside the pin 42, which presses the cutting blade 22. To attach or remove the cutting blade 22, the user handles the cutting blade 22 while maintaining the unlocked state by holding the sleeve 33 in a rotational position by means of a continuous opening process on an actuable component 52. A well-known blade holder device for a jigsaw is found in the JP 2011 - 255 449 A (Patent literature 2) revealed. A cutting blade holder device 10 described in patent literature 2 comprises a rod 11, a cutting blade guide 12, a guide engagement component 20, a cutting blade holder 13, an actuating component 14, and a torsion spring 18. The cutting blade guide 12 is cylindrical and is held at the lower end of the rod 11 by a cylindrical guide bearing 15 located between the cutting blade guide 12 and the lower end of the rod 11. The guide engagement component 20 is located below the guide bearing 15. The cutting blade holder 13 and the actuating component 14 are each cylindrical. The cutting blade holder 13 and the actuating component 14 are connected to each other, with the guide bearing 15 and the guide engagement component 20 being received radially on the inside of the cutting blade holder 13 and the actuating component 14, respectively. The torsion spring 18 is located between the actuated component 14 and the guide engagement component 20. The torsion spring 18 pre-tensions the actuated component 14 in a cutting blade holder position in the direction of rotation. The cutting blade guide 12 is received in an inner hole of the rod 11 in a manner that allows movement in the axial direction. The cutting blade guide 12 is pressed deep into the interior in response to a pressure exerted by a cutting blade B, which is received in a guide groove 12c on the cutting blade guide 12. A pair of rotary locking edges 12a of the cutting blade guide 12 is then pulled out of corresponding engagement grooves 13f of the cutting blade holder 13. The actuated component 14 then automatically rotates toward the cutting blade holder position under a preload force from the torsion spring 18. The cutting blade B has a pair of engagement ears Bb. Each engagement ear Bb is held vertically between a corresponding stop groove 20a on the guide engagement component 20 and a corresponding cam 13e on the cutting blade holder 13, which has rotated toward the cutting blade holder position. BRIEF SUMMARY In the clamp 26 of patent literature 1, the helical spring 44 is located radially outside the pin 42, which presses the cutting blade 22. Clamp 26 thus has a larger diameter. Due to this larger diameter, the user has less visibility of the area around the cutting blade 22 during operation. Furthermore, the user must maintain the opening mechanism on the actuating component 52 when inserting and removing the cutting blade 22 from clamp 26. This is cumbersome. In the cutting blade holder device 10 of patent literature 2, the engagement ears Bb are held vertically in the cutting blade B. The engagement ears Bb are therefore subject to slight wear. This changes the angle at which the cutting blade B is mounted, thereby impairing its handling. One or more aspects of the present disclosure relate to a reciprocating cutting tool that allows for easy attachment and removal of a cutting blade. One aspect of the revelation envisions a reciprocal cutting tool, with a cutting blade holder to which a cutting blade can be removably attached, in which the cutting blade holder is movable back and forth and the cutting blade holder a first pressed component that moves towards or away is movable from the cutting blade to press the cutting blade, a first prestressing component configured to prestress the first pressing component, a second pressing component configured to press the cutting blade in a direction different from the direction in which the first pressing component presses the cutting blade, and a second prestressing component configured to prestress the second pressing component, where the first pressing component automatically presses the cutting blade when the second pressing component is pressed through the cutting blade, and The first prestressing component is positioned in such a way as to avoid being in the same direction of movement as the