Tabletop cutting machine

Patent metadata

Field	Value
Publication number	US-11633795-B2
Application number	US-201916582409-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Oct 30, 2018
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

An easily operable, highly durable cutting machine finely adjusts the miter angle of a turntable. A cutting machine includes a turntable supported in a manner rotatable horizontally to a base and including a substantially disk-shaped table body to receive a workpiece and a table extension protruding forward from the table body, a cutting machine body located above the turntable and connected in a manner swingable vertically to the turntable, and a fine angle adjuster that adjusts a rotation angle of the turntable with respect to the base and including a rack on the base, a pinion located in the table body within an area of the table body as viewed from above and engageable with the rack directly or indirectly, and an operation part operable to rotate the pinion.

First claim

What is claimed is:

1. A cutting machine, comprising:
a base;
a rotation support shaft;
a turntable (i) supported in a manner rotatable horizontally to the base around the rotation support shaft and (ii) including
a substantially disk-shaped table body configured to receive a workpiece, and
a table extension protruding forward from the table body;
a cutting machine body above the turntable and connected in a manner swingable vertically to the turntable; and
a fine angle adjuster configured to adjust a rotation angle of the turntable with respect to the base, the fine angle adjuster including
a rack on the base,
a pinion that (i) overlaps the table body as viewed from above and (ii) is configured to engage the rack, and
a rotational shaft (i) including an operation part that is configured to rotate the pinion and (ii) extending parallel to the rotation support shaft,
wherein the pinion is coaxial with the rotational shaft.

2. The cutting machine according to claim 1 , wherein
the pinion is configured to move in an extending direction of a rotation axis of the pinion between an engagement position at which the pinion is engaged with the rack and a release position at which the pinion is disengaged from the rack.

3. The cutting machine according to claim 1 , wherein
the rack includes
an arc-shaped rack body, and
a plurality of teeth (i) protruding from the rack body toward a radial center of the rack body and (ii) spaced circumferentially along the rack body, and
the pinion has a rotation axis parallel to the radial center of the rack body.

4. The cutting machine according to claim 2 , further comprising:
a spring configured to urge the pinion from the engagement position toward the release position.

5. The cutting machine according to claim 1 , wherein
the pinion and the operation part are above a rear area and at an outer periphery of the table body.

6. The cutting machine according to claim 1 , wherein
the table body includes
a right front wall rightward from the table extension and standing vertically along an outer peripheral edge of the table body, and
a left front wall leftward from the table extension and standing vertically along the outer peripheral edge of the table body, and
the operation part protrudes radially outward from at least one of the right front wall or the left front wall.

7. The cutting machine according to claim 6 , wherein
the operation part includes
a first operation part protruding radially outward from the right front wall, and
a second operation part protruding radially outward from the left front wall, and
the pinion includes
a first pinion rotatable integrally with the first operation part, and
a second pinion rotatable integrally with the second operation part.

8. The cutting machine according to claim 6 , wherein
the rack includes
an arc-shaped rack body facing upward or downward, and
a plurality of teeth protruding upward or downward from the rack body and spaced along the rack body,
the plurality of teeth and the pinion are bevel gears, and
the pinion is radially movable from the rack to be disengaged from the rack.

9. The cutting machine according to claim 6 , wherein
the pinion and the operation part are integral with each other to rotate integrally.

10. The cutting machine according to claim 1 , further comprising:
a reduction mechanism (i) between the pinion and the rack and (ii) configured to reduce a rotational speed of the pinion for transmitting rotation of the pinion to the rack.

11. The cutting machine according to claim 1 , wherein
the fine angle adjuster includes a clutch mechanism configured to disable transmission of power for rotating the turntable with respect to the base when receiving a predetermined torque or greater.

12. The cutting machine according to claim 10 , wherein
the fine angle adjuster includes a clutch mechanism configured to disable transmission of power for rotating the turntable with respect to the base when receiving a predetermined torque or greater,
the reduction mechanism includes
a first shaft rotatable integrally with the operation part, and
a second shaft configured to rotate at a lower speed than the first shaft, and
the clutch mechanism is in the second shaft.

13. The cutting machine according to claim 12 , wherein
the clutch mechanism includes a first cam and a second cam engageable with each other to enable power transmission and disengageable from each other to disable power transmission, and
the second cam is integral with the pinion engageable directly with the rack.

14. The cutting machine according to claim 2 , wherein
the rack includes
an arc-shaped rack body, and
a plurality of teeth (i) protruding from the rack body toward a radial center of the rack body and (ii) spaced circumferentially along the rack body, and
the pinion has a rotation axis parallel to the radial center of the rack body.

15. The cutting machine according to claim 3 , further comprising:
a spring configured to urge the pinion from the engagement position toward the release position.

16. The cutting machine according to claim 2 , wherein
the pinion and the operation part are above a rear area and at an outer periphery of the table body.

17. The cutting machine according to claim 3 , wherein
the pinion and the operation part are above a rear area and at an outer periphery of the table body.

18. The cutting machine according to claim 4 , wherein
the pinion and the operation part are above a rear area and at an outer periphery of the table body.

19. The cutting machine according to claim 2 , wherein
the table body includes
a right front wall rightward from the table extension and standing vertically along an outer peripheral edge of the table body, and
a left front wall leftward from the table extension and standing vertically along the outer peripheral edge of the table body, and
the operation part protrudes radially outward from at least one of the right front wall or the left front wall.

Assignees

• Makita Corp

Inventors

• Miwa Yuki
• Yamamura Goh

Classifications

• B23D45/024

  the saw blade being adjustable according to depth or angle of cut (B23D45/022 takes precedence) · CPC title

• B27B5/29

  Details; Component parts; Accessories · CPC title

• B23D47/025

  of tables · CPC title

• B23D45/048 Primary

  the saw blade being adjustable according to angle of cut · CPC title

• B23D59/002 Primary

  for the position of the saw blade (mounting for swiveling or tilting a circular saw blade B27B5/36; portable power-driven circular saws with adjustment for cutting depth or amount of tilting B27B9/02) · CPC title