Method of holding band saw blade by means of band saw blade guide device, as well as band saw blade guide device

Patent metadata

Field	Value
Publication number	US-9289837-B2
Application number	US-201013502768-A
Country	US
Kind code	B2
Filing date	Oct 5, 2010
Priority date	Oct 20, 2009
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

In the process of holding a non-toothed section of a band saw blade between a fixed insertion block and a movable insertion block included in a band saw blade guide device, the movable insertion block is moved while a return allowing unit included in an insertion block moving unit is held in a returnable state, the insertion block moving unit configured to move the movable insertion block toward the fixed insertion block. The band saw blade is firmly held between the fixed insertion block and the movable insertion block. Thereafter, the entirety of the insertion block moving unit, including the return allowing unit, is fixed in an immovable state by a mechanical fixing unit.

First claim

The invention claimed is:

1. A method of holding a band saw blade by means of a band saw blade guide device in a band saw machine, comprising:
in the process of holding a non-toothed section of the band saw blade between a fixed insertion block provided at a first side insertion arm of a main body block and a movable insertion block provided to be movable at a second side insertion arm of the main body block in a direction toward and away from the fixed insertion block, moving the movable insertion block via a return allowing unit, the return allowing unit including a pressing force transmitting member and a passive member, the pressing force transmitting member pressed and moved by an actuator configured to move the movable insertion block toward the fixed insertion block, the passive member passively moved by the movement of the pressing force transmitting member and movable relative to the pressing force transmitting member;
firmly holding the band saw blade between the fixed insertion block and the movable insertion block;
fixing one of the pressing force transmitting member and the passive member of the return allowing unit in fixed state with respect to the main body block by use of a fixing unit; and
returning the other one of the pressing force transmitting member and the passive member and the movable insertion block by a previously-set amount of return such that the movable insertion block is returned to a fixed state by the fixing unit, and such that a clearance between the fixed insertion block and the movable insertion block is maintained in relation to a thickness of the band saw blade.

2. The method of holding a band saw blade by means of a band saw blade guide device according to claim 1 , wherein the clearance is within a range of S/L of 1/1000 to 1/1100 where L denotes a width dimension of the band saw blade, and S denotes a value obtained by subtracting a thickness dimension of the band saw blade from a clearance dimension between the fixed insertion block and the movable insertion block.

3. A band saw blade guide device in a band saw machine, comprising:
a main body block including a back portion supporting member supporting and guiding a back portion of a band saw blade, a fixed insertion block configured to hold and guide a non-toothed section of the band saw blade, and a movable insertion block provided opposed to the fixed insertion block;
an actuator moving the movable insert block toward the fixed insertion block;
an insertion block moving unit provided between the actuator and the movable insertion block, and configured to move the movable insertion block in response to an operation of the actuator; and
a return allowing unit included in the insertion block moving unit and including a pressing force transmitting member, a passive member and an elastic member, wherein:
the pressing force transmitting member is configured to transmit a pressing force of the actuator to the movable insertion block to firmly hold the band saw blade with the fixed insertion block,

the passive member is configured to be pressed by the pressing force transmitting member and is further configured to be movable relative to the pressing force transmitting member,
the elastic member is configured to bias the movable insertion block with respect to the fixed insertion block,
the return allowing unit includes the pressing force transmitting member having a slider which is movably provided to the main body block, and the passive member having a hollow slider, the slider movably provided inside the hollow slider, the pressing force transmitting member directly pressed by the actuator, the passive member passively moved by the movement of the pressing force transmitting member,
the band saw blade guide device further comprises a fixing unit configured to fix the insertion block moving unit including the return allowing unit with respect to the main body block such that the fixing unit fixes the passive member when the band saw blade is held between the fixed insertion block and the movable insertion block, and then the actuator retracts allowing the slider and the movable insertion block to slide back from a biased position due to an action of the elastic member within a movable ran e of the slider inside the hollow slider, and
the return allowing unit allows the pressing force transmitting member and the movable insertion block to return by a previously-set amount of return, as the slider is moved within the hollow slider when the actuator is returned to an initial state after the hollow slider in the return allowing unit is fixed by the fixing unit, such that after the pressing force of the actuator is removed and the slider returns to an unbiased position due to the action of the elastic member, the band saw blade is still held between the fixed insertion block and the movable insertion block while the hollow slider is fixed by the fixing unit, so as to maintain a clearance between the fixed insertion block and the movable insertion block in relation to a thickness of the band saw blade.

4. A band saw blade guide device, comprising:
main body block having a fixed insertion block and a movable insertion block movable toward and away from the fixed insertion block;
an actuator configured to move the movable insertion block toward the fixed insertion block;
an insertion-block mover provided between the actuator and the movable insertion block and configured to move the movable insertion block toward the fixed insertion block, the insertion-block mover comprising:
a slider movable toward and away from the actuator and provided with a slide rod adapted to engage with a movable member of the actuator;
a restrainer for restraining the movement of the slider between a first position and a second position in the restrainer, the restrainer movable toward and away from the actuator independently of the slider;
an elastic member configured to urge the restrainer to move toward the actuator; and
a mechanical fixator configured to stop the movement of the restrainer by fixing the restrainer to the main body block.

5. The device of claim 4 , wherein the restrainer includes a hollow slider.

Assignees

• Tokiwa Toru
• Tanaka Masatoshi
• Tsujimoto Susumu
• Nagano Yuji
• Amada Co Ltd
• Amada Machine Tools Co Ltd

Inventors

• Tokiwa Toru
• Tanaka Masatoshi
• Tsujimoto Susumu
• Nagano Yuji

Classifications

• Y10T83/7264

  With special blade guide means · CPC title

• B23D55/082 Primary

  Devices for guiding strap saw blades · CPC title

• B23D55/08 Primary

  of devices for guiding or feeding strap saw blades · CPC title