US3616826A - Control means for cutting flat surfaces - Google Patents
Control means for cutting flat surfaces Download PDFInfo
- Publication number
- US3616826A US3616826A US35011A US3616826DA US3616826A US 3616826 A US3616826 A US 3616826A US 35011 A US35011 A US 35011A US 3616826D A US3616826D A US 3616826DA US 3616826 A US3616826 A US 3616826A
- Authority
- US
- United States
- Prior art keywords
- control means
- pulse
- panel
- pulses
- wheels
- 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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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/003—Mechanical surface treatment
Definitions
- An electronic circuit control means for producing random spaced surface cuts on panels or boards to simulate a hand hewn product.
- a line of cutter wheels is positioned above the panel or board surface and controlled elements move toward the panel surface to remove a small portion of the surface.
- the cutter wheel motion is controlled by a combination of electronic oscillators, the frequencies of which vary with time to produce a random pattern of cut areas.
- the cutters are also moved transversely by a similar control means.
- This invention is an improvement over the panel or board cutting control means disclosed in patent application Ser. No. 579,624, filed Sept. 13, 1968 and assigned to the assignee of this application, i.e., U.S. Plywood- Champion Papers Inc.
- One of the features of the present invention is the complete automatic operation wherein the pattern of the cuts is provided by an electronic circuit, operated in random fashion.
- Another feature of the invention is the use of a transverse control means to move the cutters across the width of the board to increase the rustic effect.
- FIG. 1 is a plan view of the machine embodying the invention.
- FIG. 2 is a cross sectional view of the machine shown in FIG. l and is taken along line 2-2 of that figure.
- FIG. 3 is a clock circuit diagram showing all the control 3,616,826 Patented Nov. 2., 1971 circuits and the hydraulic control means for operating the cutters.
- FIG. 4 is a schematic diagram of connections of a rate multiplier for increasing the rise time of the pulses generated by the oscillators.
- FIG. 5 is a schematic diagram of connections of a limit switch for reversing the direction of a stepping motor.
- FIG. 6 is a series of graphs showing the relationship of the oscillator waves and some of the pulses.
- the cutting machine comprises two side supports 10, 11 and a flat bed plate 12.
- Supports 10 and 11 act as bearings for four sprocket wheels 13 which mesh with two endless chains 14 and 15, adapted to engage a panel board 16 and push it under the cutter assembly.
- the sprocket wheels 13 are coupled to shafts 17 and one of the shafts 17 is secured to another sprocket wheel 18 which is turned by a motor 20.
- the cutting assembly is supported generally between two Vertical plates 21, 22 and includes a plurality of cutting wheels 23 for making the cuts in the panel board 16.
- the cutting wheels are each rotatably mounted on a yoke 24 and a common motor 27.
- the cutter wheels 23 are supported vertically by an adjustable post 28 and an eccentric 30 secured to a transverse shaft 31.
- the shaft 31 is turned by a bell crank 32 (see FIG. 3), coupled to a yoke 33 and a hydraulic piston in a cylinder 34.
- the cutter wheels 23 and their yokes 24 are supported horizontally lby strips 35 having one end pinned, by a at or upstanding pin, to a transverse bar 36. The cutter wheels are lowered to cut the panel each time the shaft 31 is turned.
- the transverse position of the cutter wheels 23 is controlled by the position of bar 36.
- This bar is coupled to an eccentric 37 turned by a stepping motor 38.
- the stepping motor 38 is powered by a hydraulic system but controlled by an electric circuit.
- the electric portion of this unit may be a two phase motor which rocks either clockwise or counterclockwise to open selected parts for the fluid under pressure.
- the result is an incremental motion of shaft 40 (FIG. 3,) to move the eccentric 37 and all the cutter wheels.
- the side motion of the wheels is necessary to create a random pattern of cuts on the panel board. There may be times when the side motion of the cutter wheels 23 must Ibe contained within certain limits, depending upon the type of board being cut.
- a limit switch 41 is provided for this purpose.
- Each oscillator Igenerates an alternating current having a frequency less than cycles per second. Each oscillator is subject to gradual change of frequency of its output.
- Each oscillator is connected to a binary counter 50, 51, 52, and 53 having four output conductors. As each counter is activated by a positive pulse from its oscillator it applies a negative pulse to one of its four output conductors in a sequential manner.
- Counters 50 and S1 send their output pulses to a first pulse rate multiplier 54 while the other counters 52 4and 53 send their output pulses to a second pulse rate multiplier 55. The counter outputs are sent to the pulse rate multiplier to alter the wave shape and produce a fast rise time.
- the multiplier circuits also act as partial summation circuits.
- FIG. 4 shows the details of the pulse rate multiplier circuits.
- a single output terminal 65 is connected to one of the bistable flip-ops, either 66 or 67.
- the rate multiplier circuit includes four identical subcircuits to the left of dotted line 68, each including two transistors and two input terminals. Each of these four circuits acts in a manner similar to a Schmitt trigger circuit. When there is no input one transistor 70 is conducting while the other transistor 71 is non-conducting.
- transistor conductance is switched from transistor 70 to transistor 71 but there is no output -because diode 72 does not pass the negative pulse.
- transistor conductance returns to normal and a positive pulse is sent through diode 72 to the base of transistor 73.
- Transistor 73 is normally conducting but when the positive pulse is received it is made non-conducting and transistor 74 (normally non-conducting) is made conducting.
- a steep output pulse may be derived from terminal 75 but if an ampliiied pulse is desired, amplifying transistors 76 and 77 may be used to produce ⁇ a strong output pulse yat terminal 65.
- a feed-back circuit is used to further shape the output pulse. It is the connection between the collector electrode of transistor 716 and the base electrode of transistor 73. Diode 78 sends only positive pulses over this connection.
- the outputs from the rate multipliers 66 and 67 are in the form of -variable frequency pulse trains.
- the pulses are of short duration and to maintain a control signal for Va longer time, bistable lip-flops are connected respectively to their output terminals.
- One pulse applied to flip-iiop circuit shifts conductance in the circuit and sends a substantial current pulse to solenoid Iwinding 80, attracting core 81 and opening valve 82. This action energizes the hydraulic cylinder 34 and operates yoke 33 and crank 32 to llower the cutter wheels 23 to remove portions of the panel 16 surface.
- Oscillators 47 and 48 connected to counters 52 and y53 act in the same manner.
- the counters feed their pulses into the rate multiplier 55 and a similar series of random pulses is applied to the bistable flip-liep 67.
- the two output conductors 87 and 88 are respectively connected to AND gates 90 and 97 of these relays are connected in series with an oscillator 98, an amplifier 100, yand a stepping motor 38 which operates to shift the cutter wheels 23 across the width of the panel board.
- Switch 101 is normally closed so that AND gates 90 and 91 are connected to iiip-iiop circuit 66. This connection insures that there can be no transverse motion of the cutters when they are in their cutting position. The signals pass thru the AND gates uninhibited.
- a motor 104 operates a pumping unit 105 to provide the required pressure in conduits 106 and 107.
- the stepping motor 38 is controlled by a series of electromagnetic valves to move bar 36 in increments to the right or left.
- the electromagnetic portion of this combination operates in the same manner ⁇ as a reversible AC motor and may be two phase, three phase, or be single phase with a capacitor starting winding.
- FIG. 1 One method of operating this device is shown in FIG.
- the oscillator 98 furnishes the 4 AC power to turn motor 38 and is connected to relay contacts 96 and 97. These contacts are connected to the end terminals of a primary winding 1111.
- the secondary win-ding 111 is connected to a power amplifier 1-00 and a reversing switch ⁇ 41.
- Oscillator45 sends alternations through binary counter to the rate multiplier terminals 56, 57, 58 and 59. As soon as any of the negative halves of the waves reach a certain level, the circuit is activated and a steep pulse 121 is sent from the lrate multiplier 54 to the iiip-flop 66. A similar action occurs in connection with oscillator 46 which generates two pulses 112 and 123 in the rate multiplier 54. Pulse 122 triggers the flip-flop ⁇ 66 to 'generate a pulse 124 and operate valve 812. Pulse 124 is ended when the second wave from oscillator 46 sends a pulse 123 through the rate multiplier ⁇ 54 and normalizes the flip-flop 66.
- IOscillators 47 and 48 generating Waves 125 and 126 are coupled to the rate multiplier in a similar manner and produce pulses 127 and 128.
- pulses 127 and 128 When these pulses are combined in flip-flop 67 they produce a long pulse 1318 which is applied to gate 91 (switch 101 is closed).
- the AND gate 91 passes an output current only if two pulses are coincident at its input terminals. The result is two short pulses 131 and 132 which exist only when flip-flop 67 is on and flip-nop 66 is off. If switch 101 is open, the current pulses sent to motor 38 are the same as the output pulses of Hip-flop 67 on conductor 88.
- the oscillator output waves are shown in FIG. v6 as being substantially sinusoidal. Such a wave shape is not necessary and almost any kind of wave shape can be used including square topped and triangular. Also, the shape of pulses 121, 122, 123, etc. from the rate multiplier are shown as square topped pulses. Depending upon the circuit constants, the pulses may have a fast rise time but trail olf in a manner as indicated by dotted line 121A. Such a change does not effect the result as only the leading edge of the wave is used to trigger iiipflops ⁇ 66 and 67.
- Apparatus for treating the surface of a panel to prorvide thereon a plurality of randomly spaced shallow cavities comprising:
- a first control means for operating the second power means including two oscillators which produce currents having diiferent frequencies, a summation circuit for combining the oscillator currents, and a. pulse generating circuit for porducing control pulses which are applied to said second power means.
- said second power means includes a pair of fluid valves in series with a source of uid pressure and a double acting hydraulic cylinder and piston, said piston coupled to the cutting wheels.
- said summation circuit includes a plurality of Schmitt trigger circuits for providing a fast rise time to the current alternations.
- a third power means is provided for shifting the cutting wheels along the cutting line by steps, said third power means including a mechanical connection to a common shiftable bar which supports all of said cutting wheels.
- a third power means includes a source of liuid under pressure, an hydraulic stepping motor, and an electromagnetic means for controlling the stepping motor.
- a second control means operates the third power means to randomly shift the cutter wheels; said second control means includes two oscillators which produce currents having different frequencies, a summation circuit for combining the oscillator currents, and a pulse generating circuit for producing control pulses which are applied to said third power means.
- a limit switch is provided for sensing the shift position of said common shiftable bar and for reversing the shift direction whenever a limit position is sensed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Control Of Cutting Processes (AREA)
Abstract
TROLLED BY A COMBINATION OF ELECTRONIC OSCILLATORS, THE FRE QUENCES OF WHICH VARY WITH TIME TO PRODUCE A RANDOM PATTERN OF CUT AREAS. THE CUTTERS ARE ALSO MOVED TRANSVERSELY BY A SIMILAR CONTROL MEANS.
Description
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3501170A | 1970-05-06 | 1970-05-06 | |
US11866571A | 1971-02-25 | 1971-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3616826A true US3616826A (en) | 1971-11-02 |
Family
ID=26711662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US35011A Expired - Lifetime US3616826A (en) | 1970-05-06 | 1970-05-06 | Control means for cutting flat surfaces |
Country Status (1)
Country | Link |
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US (1) | US3616826A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4046180A (en) * | 1976-06-15 | 1977-09-06 | Island Lumber Specialties Ltd. | Automatic control apparatus for waney edge forming machines |
US4054165A (en) * | 1974-03-14 | 1977-10-18 | Karakawa Fancy Plywood Works Ltd. | Grooved sheet material |
EP0332149A1 (en) * | 1988-03-09 | 1989-09-13 | Koch, Hubert Josef | Apparatus for milling surface contours onto wooden boards |
AU665925B3 (en) * | 1995-04-07 | 1996-01-18 | Gino Costa | Method and apparatus for distressing a timber surface |
ITUB20152871A1 (en) * | 2015-08-05 | 2017-02-05 | Scm Group Spa | SHAVING MACHINE |
ITUB20154951A1 (en) * | 2015-11-06 | 2017-05-06 | Scm Group Spa | Machine and Processing Method for Wood |
US11305445B1 (en) | 2020-04-24 | 2022-04-19 | John Peachey | Surface texturing apparatus |
-
1970
- 1970-05-06 US US35011A patent/US3616826A/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4054165A (en) * | 1974-03-14 | 1977-10-18 | Karakawa Fancy Plywood Works Ltd. | Grooved sheet material |
US4046180A (en) * | 1976-06-15 | 1977-09-06 | Island Lumber Specialties Ltd. | Automatic control apparatus for waney edge forming machines |
EP0332149A1 (en) * | 1988-03-09 | 1989-09-13 | Koch, Hubert Josef | Apparatus for milling surface contours onto wooden boards |
AU665925B3 (en) * | 1995-04-07 | 1996-01-18 | Gino Costa | Method and apparatus for distressing a timber surface |
ITUB20152871A1 (en) * | 2015-08-05 | 2017-02-05 | Scm Group Spa | SHAVING MACHINE |
ITUB20154951A1 (en) * | 2015-11-06 | 2017-05-06 | Scm Group Spa | Machine and Processing Method for Wood |
US11305445B1 (en) | 2020-04-24 | 2022-04-19 | John Peachey | Surface texturing apparatus |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: U.S. PLYWOOD CORPORATION, ONE CHAMPION PLAZA, STAM Free format text: LICENSE;ASSIGNOR:SECURITY PACIFIC BUSINESS CREDIT INC., A DE CORP;REEL/FRAME:004480/0602 Effective date: 19850828 Owner name: U.S. PLYWOOD CORPORATION, A CORP. OF DE. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CHAMPION INTERNATIONAL CORPORATION A CORP OF NEW YORK;REEL/FRAME:004476/0458 Effective date: 19850828 Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 10680 TREEN Free format text: SECURITY INTEREST;ASSIGNOR:U.S. PLYWOOD CORPORATION;REEL/FRAME:004480/0584 Effective date: 19850828 |
|
AS | Assignment |
Owner name: U.S. PLYWOOD CORPORATION, CONNECTICUT Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:SECURITY PACIFIC BUSINESS CREDIT INC.;REEL/FRAME:005219/0021 Effective date: 19870828 Owner name: GEORGIA-PACIFIC CORPORATION, A GA CORP., GEORGIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:U.S. PLYWOOD CORPORATION;REEL/FRAME:005223/0007 Effective date: 19880104 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |