US2073898A - Frame saw - Google Patents

Frame saw Download PDF

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Publication number
US2073898A
US2073898A US44281A US4428135A US2073898A US 2073898 A US2073898 A US 2073898A US 44281 A US44281 A US 44281A US 4428135 A US4428135 A US 4428135A US 2073898 A US2073898 A US 2073898A
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United States
Prior art keywords
saw
work piece
frame
roller
rollers
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Expired - Lifetime
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US44281A
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Lof Emil
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Individual
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Individual
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Publication of US2073898A publication Critical patent/US2073898A/en
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    • 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
    • B27B3/00—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks
    • B27B3/02—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks with vertically-reciprocating saw frame
    • B27B3/14—Arrangements for raising or lowering the feed rollers
    • 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
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6579—With means to press work to work-carrier

Definitions

  • This invention relates to vertical frame saws and more specifically to improved means for lifting the upper feeding rollers of the saw.
  • the object of this invention is to remove said drawback by carrying out the lifting means in such manner that the starting and stopping of said means are performed by the log supplied to the saw and thus is performed without requiring any attendance of the operator.
  • Said dogs are combined with and form operating means for starting mechanically operated devices by means of which first the upper feeding roller on the front side of the saw and then the upper feeding roller on the back side are lifted to such extent that the work piece supplied to the saw can be introduced between the feeding rollers.
  • the said dogs are, preferably, journalled in such manner that they partake in the vertical movements of the rollers, the lower ends of the dogs being situated somewhat higher than the lowermost part of the roller whereby it is attained that the dog is disengaged from the work piece when the corresponding roller has been raised sufficiently to allow the introduction of the work piece below the roller.
  • a spring, acounterweight, or the like the dog is then returned to its normal position whereby the lifting means is switched off.
  • Fig. 1 shows a front view
  • Fig. 2 a side view of 50 the saw.
  • I are the upper feeding rollers of the frame saw.
  • the lifting means for each of said rollers consists of a cylinder 2 secured to the frame 3 and containing a piston 4 which by means of a piston rod 5, a cross-piece 6 and rods 1 is connected to the supporting frame 8 of the upper roller.
  • a tube 9 connects the cylinder 2 with a three-way cook it to which is also connected a tube II for the supply of a liquid or gaseous pressure fluid, said cock being by means of links l2 connected with a lever l4 journalled on a pin [3 in the roller frame 8.
  • the lever l4 forms a dog which is 10 actuated upon by the work piece when the latter is supplied to the frame saw I thus causing the cock 10 to be turned to supply the pressure fluid to the cylinder 2 whereby the piston 4 is moved and raises the upper feeding roller sufficiently 15 to allow the introduction of the work piece below said roller.
  • the lever 14 is journalled on the I frame of the upper feeding roller it accompanies the roller in the upward movement and when the latter has been lifted sufficiently for the introducing of the work piece below said roller the lever I4 is disengaged from the work piece and falls back to its normal position, causing the cock in to be reversed so that the supply of the pressure fluid to the cylinder 2 is cut off 25 and the latter is opened to the atmosphere.
  • the roller I can fall down on the work piece with its full weight; The same operation is repeated when the work piece is pushed in between the feeding rollers on the back side 30 of the frame saw.
  • the invention is not limited to the use ofllydraulic or pneumatic cylinders for the lifting of the upper feeding rollers but may also be used in connection with other well-known or suitable 35 means for such purpose, as for instance in connection with mechanical lifting devices having power transmission from the crank shaft of the saw by a coupling which is operated by a dog actuated upon by the work piece. 40
  • a frame saw comprising pressure rollers, vertically movable frames supporting said rollers, means for lifting said frames and rollers, trip levers journalled on said frames so as to normally project into'the path of the Work and connected to said lifting means to start the latter when acted upon by a work piece, and means to return the trip levers into inoperative position when the supporting frames have been lifted sufliciently to allow the work to enter below the pressure rollers.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Description

March 16, 1937. E. LGF 2,073,898
FRAME SAW Filed 001:. 9,, 1935 2 Sheets-Shez et lv 6 Fi .1.
March 16, 1937. I
FRAME SAW Filed 001;. 9, 1955 2 Sheets-Sheet 2 Patented Mar. 16, 1937 UNITED STATES FRAME SAW Emil Liif, Stockholm, Sweden Application October 9, 1935, Serial No. 44,281 In Sweden October 10, 1934 1 Claim.
This invention relates to vertical frame saws and more specifically to improved means for lifting the upper feeding rollers of the saw.
It is known to provide frame saws with mechanically operated lifting means for the upper feeding rollers to facilitate the introduction of the work piece to be out between the feeding rollers of the saw. The starting and stopping of such lifting means were hitherto carried out by hand by the operator which caused a loss of time and reduced the efficiency of the saw.
The object of this invention is to remove said drawback by carrying out the lifting means in such manner that the starting and stopping of said means are performed by the log supplied to the saw and thus is performed without requiring any attendance of the operator. I use for such purpose swingable dogs or the like placed in the path of the work piece in advance of each of the upper feeding rollers, said dogs being actuated upon by the work piece when the latis saved and a more perfect cutting of the work piece can be attained. Said dogs are combined with and form operating means for starting mechanically operated devices by means of which first the upper feeding roller on the front side of the saw and then the upper feeding roller on the back side are lifted to such extent that the work piece supplied to the saw can be introduced between the feeding rollers. The said dogs are, preferably, journalled in such manner that they partake in the vertical movements of the rollers, the lower ends of the dogs being situated somewhat higher than the lowermost part of the roller whereby it is attained that the dog is disengaged from the work piece when the corresponding roller has been raised sufficiently to allow the introduction of the work piece below the roller. By means of a spring, acounterweight, or the like the dog is then returned to its normal position whereby the lifting means is switched off.
In the accompanying drawing I have shown an embodiment of the improved frame saw. Fig. 1 shows a front view and Fig. 2 a side view of 50 the saw.
Referring to the drawing, I, I are the upper feeding rollers of the frame saw. The lifting means for each of said rollers consists of a cylinder 2 secured to the frame 3 and containing a piston 4 which by means of a piston rod 5, a cross-piece 6 and rods 1 is connected to the supporting frame 8 of the upper roller. A tube 9 connects the cylinder 2 with a three-way cook it to which is also connected a tube II for the supply of a liquid or gaseous pressure fluid, said cock being by means of links l2 connected with a lever l4 journalled on a pin [3 in the roller frame 8. The lever l4 forms a dog which is 10 actuated upon by the work piece when the latter is supplied to the frame saw I thus causing the cock 10 to be turned to supply the pressure fluid to the cylinder 2 whereby the piston 4 is moved and raises the upper feeding roller sufficiently 15 to allow the introduction of the work piece below said roller. As the lever 14 is journalled on the I frame of the upper feeding roller it accompanies the roller in the upward movement and when the latter has been lifted sufficiently for the introducing of the work piece below said roller the lever I4 is disengaged from the work piece and falls back to its normal position, causing the cock in to be reversed so that the supply of the pressure fluid to the cylinder 2 is cut off 25 and the latter is opened to the atmosphere. On account thereof the roller I can fall down on the work piece with its full weight; The same operation is repeated when the work piece is pushed in between the feeding rollers on the back side 30 of the frame saw.
The invention is not limited to the use ofllydraulic or pneumatic cylinders for the lifting of the upper feeding rollers but may also be used in connection with other well-known or suitable 35 means for such purpose, as for instance in connection with mechanical lifting devices having power transmission from the crank shaft of the saw by a coupling which is operated by a dog actuated upon by the work piece. 40
What I claim is:--
A frame saw, comprising pressure rollers, vertically movable frames supporting said rollers, means for lifting said frames and rollers, trip levers journalled on said frames so as to normally project into'the path of the Work and connected to said lifting means to start the latter when acted upon by a work piece, and means to return the trip levers into inoperative position when the supporting frames have been lifted sufliciently to allow the work to enter below the pressure rollers.
EMIL L61.
US44281A 1934-10-10 1935-10-09 Frame saw Expired - Lifetime US2073898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2073898X 1934-10-10

Publications (1)

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US2073898A true US2073898A (en) 1937-03-16

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US44281A Expired - Lifetime US2073898A (en) 1934-10-10 1935-10-09 Frame saw

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767748A (en) * 1954-11-17 1956-10-23 Lane Company Inc Apparatus for stabilizing boards emerging from gangsaws

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767748A (en) * 1954-11-17 1956-10-23 Lane Company Inc Apparatus for stabilizing boards emerging from gangsaws

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