US3456695A - Arrangement for a band saw apparatus - Google Patents

Arrangement for a band saw apparatus Download PDF

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Publication number
US3456695A
US3456695A US3456695DA US3456695A US 3456695 A US3456695 A US 3456695A US 3456695D A US3456695D A US 3456695DA US 3456695 A US3456695 A US 3456695A
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US
United States
Prior art keywords
cover
operating lever
blade
brake
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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English (en)
Inventor
Huvi Israel Akrenius
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Individual
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Individual
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Publication date
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Publication of US3456695A publication Critical patent/US3456695A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B13/00—Band or strap sawing machines; Components or equipment therefor
    • B27B13/14—Braking devices specially designed for band sawing machines, e.g. acting after damage of the band saw blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/707—By endless band or chain knife

Definitions

  • the present invention relates to an arrangement for a band saw comprising at least two, and possibly more, blade Wheels, which are placed one above the other and rotate on parallel axles, a band blade running over the blade wheels, an electric motor for the blade Wheels and a cover frame, which essentially encloses the band blade and the blade wheels.
  • Band saws of this type are very often used in industrial joinery to saw wood or the like and in the provision industry to cut meat and bones.
  • the blade moves with considerable speed and after the electric motor driving the blade wheels has been stopped, the blade continues to rotate, even for several minutes, due to the inertia of the blade wheels, thus constituting a continuous danger to the person operating the machine.
  • An object of this invention is to eliminate the above disadvantage and to improve working safety in connection with band saws.
  • the invention is mainly characterized in that the operating lever of the electric motor is connected to a brake acting upon the axle of one of the blade wheels, the brake being automatically placed in the braking position when the motor is stopped by the operating lever, the operating lever being provided with means for locking the cover of the frame when the motor is started by the operating lever and the cover of the frame being provided with means for preventing the starting of the electric motor when the cover is open.
  • the band saw according to the invention comprises a box-like frame 1, having a side Wall with an openable cover 2 mounted on hinges 3.
  • a horizontal axle is mounted, which supports a blade wheel 4
  • a horizontal axle 6 is mounted, which supports a blade wheel 7.
  • the axle 6 is driven by means of an electric motor 8.
  • a band blade 5 runs around both blade wheels.
  • axle 9 which extends parallel with the aforesaid axles and one end of which is rigidly joined to an operating lever 10, the opposite end being provided with, a cross handle 11.
  • a cogged plate lock 12 is fastened to the part of the axle 9 which is inside of the frame (FIGS. 3 and 4), and operates a microswitch 13 which is attached to the frame, and joined to the starting circuit of the electric motor 8 by the wires 14, 15.
  • the lock plate and microswitch are fitted in relation to each other so that when the operating lever is in the stop position A, as shown in FIGURE 3, the microswitch opens the circuit connected to wires 14 and 15 and when the operatitng lever is in the starting position B, as shown in FIGURE 4, the microswitch closes the circuit connected to wires 14 and 15.
  • the cross handle 11 is hingedly connected to a rod 16, which is mounted at 16' to the frame so that it can slide linearly back and forth in the frame when the operating handle is turned.
  • the rod is fitted so that it can engage a brake 17 arranged on the axle 6 of the blade Wheel 7.
  • the brake comprises two brake shoes 18, 19, which are hingedly connected to each other and fastened to the frame, and a spring arrangement 21 acts on shoes 18, 19, to urge the brake shoes against the axle 6.
  • the operating lever, rod and brake are so arranged that when the operating lever is in the stop position A (FIG.
  • the operating lever is additionally provided with a projection 24, which acts together with a catch 25 on the cover 2 so that when the operating lever is in the stop position A, the projection 24 is removed from the catch 25, but when the operating lever is in the starting position B, the projection 24 has moved in front of the catch 25 preventing the opening of the cover as may be seen in FIGURE 4.
  • a tenon 26 is fixed to the side of the cover catch 25 facing the frame, and in the corresponding region in the frame there is a spring-loaded rod 27 mounted in bearings, which activates a microswitch 28, which is connected to the starting circuit of the electric motor by the Wires 29, 30.
  • the arrangement of the tenon 26, the rod 27 and the microswitch 28 is such that when the cover is closed, the tenon 26 presses the rod 27 inwards, and thus the rod 27 presses against the microswitch 28 closing the circuit connected to the wires 29 and 30 whereas when the cover is open the rod 27 is pressed outward by the spring of the microswitch 28 whereby the circuit connected to the wires 29 and 30 is opened.
  • the locking of the cover has been described to take place simply by means of the fixed projection 24 on the operating lever. In some cases it may be preferable to place the locking point and the operating lever further apart, in which case it may be advantageous to connect the operating lever with a suitable rod arrangement, which engages the cover and locks it when the operating lever i turned to the starting position.
  • a suitable rod arrangement which engages the cover and locks it when the operating lever i turned to the starting position.
  • the microswitch 28 it may be possible to use a different arrangement to prevent the starting of the motor as long as the cover remains open, for instance by a tenon mounted in bearings in the frame, which by means of a spring is pushed in front of the operating lever preventing such lever from being turned as long as the cover is open, and which tenon is pushed away from the operating lever by the cover when the cover is closed.
  • a band saw comprising two blade wheels, parallel axles supporting said blade wheels for rotation, a band blade running over the blade wheels, drive means for driving the blade wheels, a cover frame substantially enclosing the band blade and the blade wheels, an openable cover on said frame, an operating lever for the drive means, said operating lever being displaceable between start and stop positions for the drive means, a brake means for acting upon the axle of one of the blade wheels, said brake means having operative and inoperative positions, means coupling the operating lever and the brake means such that the brake means is automatically placed in operative position when the operating lever is moved to stop the motor, means on the operating lever tor locking the cover of the frame when the operating lever is moved to start the drive means and means on said cover for preventing the starting of the drive means when the cover is open.
  • said brake means comprises pivotally connected brake shoes urged against the axle of the said one blade wheel, said means coupling the operating lever and the brake means comprising a rod connected to said operating lever for being moved therewith to engage the brake shoes and pivotably displace the same from the axle of said one blade wheel when the operating handle is turned to the starting position.
  • a saw as claimed in claim 1 wherein said means on the operating lever for locking said cover comprises a projection on said lever which slides in front of the cover of the frame preventing it from being opened when the operating lever is in the starting position.
  • a saw as claimed in claim 4 comprising a microswitch controlling the energization of the electric motor, said means for preventing the starting of the motor when the cover is open comprising an element on said cover which closes the microswitch only when the cover is closed.
  • a saw as claimed in claim 5 comprising a second microswitch also controlling the energization of the electric motor, and means coupled to the operating lever for closing said second microswitch when the lever is moved to the start position.
  • a saw as claimed in claim 3 comprising switch means mounted on the frame for controlling the energization of the drive means, a catch member on said cover, said means on the cover for preventing the starting of the drive means when the cover is open comprising a tenon on said catch member for closing the switch means only when the cover is closed, said means which locks the cover when the lever is in the position to start the drive means comprising a projection on the lever which is positioned adjacent the catch member in said latter position of the lever to prevent opening of the cover.
  • a saw as claimed in claim 8 comprising spring means acting on the brake shoes adjacent the rolls in a direction perpendicular to the direction of sliding of the rod.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Braking Arrangements (AREA)
US3456695D 1966-10-20 1967-02-14 Arrangement for a band saw apparatus Expired - Lifetime US3456695A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI286166A FI42616C (fi) 1966-10-20 1966-10-20 Laite vannesahaa varten

Publications (1)

Publication Number Publication Date
US3456695A true US3456695A (en) 1969-07-22

Family

ID=8507688

Family Applications (1)

Application Number Title Priority Date Filing Date
US3456695D Expired - Lifetime US3456695A (en) 1966-10-20 1967-02-14 Arrangement for a band saw apparatus

Country Status (5)

Country Link
US (1) US3456695A (xx)
DE (1) DE1627138A1 (xx)
ES (1) ES339123A1 (xx)
FI (1) FI42616C (xx)
SE (1) SE315721B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201110A (en) * 1986-08-22 1993-04-13 Bane Marvin L Pallet dismantler
US20070214922A1 (en) * 2006-02-25 2007-09-20 Cook James T Band saw blade
US20090000455A1 (en) * 2007-06-29 2009-01-01 Chin-Feng Chang Reinforcing device for a main body of a band saw
US20110167974A1 (en) * 2010-01-12 2011-07-14 Oav Equipment & Tools, Inc. Emergency stop device for band saw
US20160297094A1 (en) * 2015-04-07 2016-10-13 King Saw Machinery Ltd. Band Saw Machine with Disk Brake Device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1474447A (en) * 1921-08-18 1923-11-20 Yale & Towne Mfg Co Electrical controlling means
US2311268A (en) * 1941-07-07 1943-02-16 Carl E Tannewitz Automatic band saw braking mechanism
GB619117A (en) * 1946-11-22 1949-03-03 William Wood Improvements in or relating to locking devices for machine guards and the like
US2500321A (en) * 1946-05-20 1950-03-14 Continental Machines Automatic hydraulic brake for band saws

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1474447A (en) * 1921-08-18 1923-11-20 Yale & Towne Mfg Co Electrical controlling means
US2311268A (en) * 1941-07-07 1943-02-16 Carl E Tannewitz Automatic band saw braking mechanism
US2500321A (en) * 1946-05-20 1950-03-14 Continental Machines Automatic hydraulic brake for band saws
GB619117A (en) * 1946-11-22 1949-03-03 William Wood Improvements in or relating to locking devices for machine guards and the like

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201110A (en) * 1986-08-22 1993-04-13 Bane Marvin L Pallet dismantler
US20070214922A1 (en) * 2006-02-25 2007-09-20 Cook James T Band saw blade
US20090000455A1 (en) * 2007-06-29 2009-01-01 Chin-Feng Chang Reinforcing device for a main body of a band saw
US20110167974A1 (en) * 2010-01-12 2011-07-14 Oav Equipment & Tools, Inc. Emergency stop device for band saw
US9486933B2 (en) * 2010-01-12 2016-11-08 Oav Equipment & Tools, Inc. Band saw with emergency stop device
US20160297094A1 (en) * 2015-04-07 2016-10-13 King Saw Machinery Ltd. Band Saw Machine with Disk Brake Device
US9868224B2 (en) * 2015-04-07 2018-01-16 King Saw Machinery Ltd. Band saw machine with disk brake device

Also Published As

Publication number Publication date
FI42616B (xx) 1970-06-01
SE315721B (xx) 1969-10-06
FI42616C (fi) 1970-09-14
ES339123A1 (es) 1968-04-16
DE1627138A1 (de) 1970-10-22

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