US3504719A - Centering device for logs - Google Patents

Centering device for logs Download PDF

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Publication number
US3504719A
US3504719A US625184A US3504719DA US3504719A US 3504719 A US3504719 A US 3504719A US 625184 A US625184 A US 625184A US 3504719D A US3504719D A US 3504719DA US 3504719 A US3504719 A US 3504719A
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United States
Prior art keywords
feeler
log
centering
arms
logs
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Expired - Lifetime
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US625184A
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English (en)
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Gunther Don
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L5/00—Manufacture of veneer ; Preparatory processing therefor
    • B27L5/02—Cutting strips from a rotating trunk or piece; Veneer lathes
    • B27L5/022—Devices for determining the axis of a trunk ; Loading devices for veneer lathes
    • 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
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2514—Lathe with work feeder or remover

Definitions

  • the present invention relates to a centering device for logs which are to be worked in wood peeling machines or the like having two lifting devices spaced apart from and independent of each other, each of which supports the log at two points and with each of which there is associated a feeling device for determining the center of the cross section of the log.
  • feelers which are kinematically connected with the lifting devices for the logs are used, and in this case the feelers carry out movements which are in opposite direction to the movements of the lifting devices.
  • Such an arrangement has not been satisfactory, since it is bound to the machine and does not permit a clear and unequivocal separation between the elements of the lifting device which are normally sturdy and heavy and the centering elements which are to operate with delicate sensitivity.
  • the object of the present invention is to develop a centering device which does not have the above-indicated drawbacks, i.e., in particular, is not part of the lifting devices but forms an independent measuring unit.
  • This objective is achieved by the fact that each feeler device has two interconnected feeler arms arranged in the manner of tongs.
  • the centering device in accordance with the invention affords the advantage that it represents an independent structural group which can be used with centering devices of the most varied construction and which permits building-block construction. Furthermore, one obtains a clear separation between the part of the device which moves the log and the part which effects the measurements.
  • the device in accordance with the invention creates the prerequisites for the log not only to be automatically centered as heretofore in a vertical plane, but also for automatic centering in a horizontal direction to be possible, since the feeler members are independent of the lifting device.
  • the feeling devices be so arranged that they are swingable about a common axis.
  • the swinging action can be affected, for instance, by a hydraulic motor.
  • the utilization made of the log upon centering in the two or even more planes is substantially greater than with centering in only one plane.
  • the feeler arms In order to permit the feeler arms to act at a favorable point on the log, they are displaceable in the direction of their common axis of rotation. The amount of the displacement in the direction toward the common axis of rotation is in this connection advantageously limited by a stop which comes against the front end of the log. In order to assure simultaneous movement of both feeler arms of each pair of feeler arms, the feeler arms are connected with each other by gears.
  • At least one feeler arm of each pair of feeler arms consists of two parts connected with each other by a swivel, one of which, as part developed as a feeler, can shift its position with respect to the other by amounts which are limited by stops.
  • FIG. 1 is a front view of a centering device in accordance with the invention
  • FIG.'2 is a side view of the centering device in accordance with FIG. 1;
  • FIG. 3 shows a detail of the invention indicated at A in FIG. 1.
  • 11 is the log which is supported on two prismatic supports 12, 13 which are carried by the piston rods 14, 15 of two lift cylinders 16, 17.
  • the lift cylinders are arranged at carriages 18 which are movable horizontally by lift cylinders 19 on guides 20, 21.
  • the centering devices consist essentially of a first feeler arm 23 consisting of a single part and of a second feeler arm 24 consisting of two parts.
  • the feeler arms are rotatably supported on pins 25 and 26 and connected with each other by gear segments 27 and 28.
  • the pins 25 and 26 are supported by side plates 29 and 30 which are seated on a sleeve 31 which is guided by a rod 32.
  • the hydraulic motor 34 By the hydraulic motor 34, the sleeve can be moved, together with the supporting arms, in the direction of the pin 35. Furthermore, it is possible to swing the supporting arms around the pin 35.
  • the swinging movement is introduced by the hydraulic motor 36 which acts on a bushing 37 which is connected for rotation via the hydraulic motor 34 with the sleeve 31 and the supporting arms 23, 24.
  • the rod 32 is supported for rotation and displacement in the bushing 37, while the bushing 37 is arranged swingably in the bearing 38.
  • the bearing 38 in its turn, is borne by a stand 39 to which the hydraulic motor 36 is also fastened.
  • connection of the piston 40 of hydraulic motor 36 to the bushing 37 can best be seen in FIG. 2.
  • the second part 46 of the swing lever 24 is provided with two extensions 47 and 48 which bear the stops 44 and 45, respectively. It also has a bridge 49 with two switches 50 and 51. These switches 50 and 51 cooperate with a gib 52 which is fastened to the feeler 41 and can actuate at one time only one of the two switches 50 and 51.
  • the centering device in accordance with the invention operates as follows:
  • a centering in the vertical direction is first effected.
  • the log is first of all transferred from a supply bench 53 (FIG. 2) onto the prismatic support 12 of the supporting device. Thereupon the supporting arms 23, 24 are moved from the side over the log. Their measurement position is determined by the stop 33 which can be adjustable.
  • the cylinder 54 is actuated and the feeler arms, due to the fact that they are connected by the gearing 27, 28, are moved uniformly toward each other.
  • the feeler 41 is in this connection in the position shown in solid line.
  • the lift cylinder 17 associated with it can lift the log further.
  • the lower feeler arm follows along and at the same time the feeler 41 approaches the log from above.
  • the feeler roller 42 of the feeler 41 strikes against the log, the feeler is brought from the position shown in solid line into the position shown in dashed line, overcoming the force of the spring 43.
  • the switches 50 and 51 are actuated, the gib 52 first releasing the switch 50 which acts on the feed circuit for the lift cylinders 16, 17 and reducing their speed of advance.
  • the log 11 is now moved in slow speeed further upward until the feeler 41 has reached its end position.
  • the gib 52 actuates the switch 51 and disconnects the lift devices.
  • the log is centered in the vertical direction.
  • the feeler fork formed by the feeler arms 23 and 24 is again opened by a certain amount and the feeler devices swung 90 by means of the cylinder 36 in order to be able to effect a centering in the horizontal plane.
  • the centering process in the horizontal plane is effected in the same manner as the centering process in the vertical plane.
  • switches 50 and 51 could be replaced by a similar signal transmitting means which controls the closing of a control slide which reduces the advance of the vertical and/or horizontal cylinder from a given initial value continuously to zero.
  • a log peeling machine including log lifting means, the combination of spaced feeler means engageable with a log supported on said lifting means for predetermining the vertical position of said log preliminary to peeling thereof, said feeler means controlling the movement of said lifting means, and said feeler means including at least two pairs of tong-like interconnected feeler arms engageable with spaced points on the log and being rotatable about the longitudinal axis of and whereby the log is centerable in different planes for peeling.
  • a device wherein there are two independent spaced lifting means, each having a feeler means thereon for controlling the same.
  • a device according to claim 1 wherein the feeler means are movable toward the ends of the log until stop means is actuated by the ends of the log.
  • a device according to claim 1 wherein the feeler arms are coupled together by a gear drive.
  • a device wherein the feeler arms are connected to step actuated switch means for first reducing speed of the lifting means and then stopping the same after a predetermined further advance.
  • one of the feeler arms of each pair is composed of two levers pivotally mounted relative to each other.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Manufacture Of Wood Veneers (AREA)
  • Jigs For Machine Tools (AREA)
US625184A 1966-03-22 1967-03-22 Centering device for logs Expired - Lifetime US3504719A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER0042902 1966-03-22

Publications (1)

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US3504719A true US3504719A (en) 1970-04-07

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ID=7406787

Family Applications (1)

Application Number Title Priority Date Filing Date
US625184A Expired - Lifetime US3504719A (en) 1966-03-22 1967-03-22 Centering device for logs

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US (1) US3504719A (enrdf_load_stackoverflow)
DE (1) DE1528340C3 (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664395A (en) * 1970-04-03 1972-05-23 Salem Equipment Inc Log pre-centering apparatus for veneer lathes
US3760855A (en) * 1970-09-14 1973-09-25 R Nilberg Apparatus for centering irregular peeler logs
US3891016A (en) * 1973-06-14 1975-06-24 Reinhold Hermann Nilberg Apparatus for centering irregular peeler logs
US3895662A (en) * 1971-07-13 1975-07-22 Taihei Seisakusho Kk Apparatus for preshaping raw logs
US3902539A (en) * 1973-02-08 1975-09-02 Keller & Co Masch C Apparatus for centering the longitudinal axis of a log on a reference axis
US3945125A (en) * 1970-04-27 1976-03-23 Weldwood Of Canada Limited Apparatus and method for centering logs for veneer processing
US4197888A (en) * 1978-02-21 1980-04-15 The Coe Manufacturing Company Log centering apparatus and method using transmitted light and reference edge log scanner
US4289051A (en) * 1979-05-23 1981-09-15 Acme-Cleveland Corporation Object centering and moving mechanism
US4427044A (en) 1981-06-30 1984-01-24 Pigott Enterprises Log centering device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1646115A (en) * 1925-03-25 1927-10-18 John G Sjostrom Veneer lathe
US2839106A (en) * 1956-05-14 1958-06-17 Northern Wood Barking Mfg Co Apparatus for rotating and transporting logs during broadside attack by bark-removing chains
AT212556B (de) * 1958-12-09 1960-12-27 Sirius Gruenbach Ag Fuer Ind Einrichtung zur Zentrierung runder Werkstücke auf eine Einspannachse
DE1162539B (de) * 1959-01-15 1964-02-06 Kralovopolska Strojirna Zd Y C Zentriervorrichtung fuer Furnierschaelmaschinen mit Hebevorrichtungen zum Heben der Kloetze zwischen die Spindelspitzen
DE1195932B (de) * 1959-08-14 1965-07-01 Roller Maschinenfabrik A Zentrier- und Beschickungseinrichtung fuer Furnier-Schaelmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1646115A (en) * 1925-03-25 1927-10-18 John G Sjostrom Veneer lathe
US2839106A (en) * 1956-05-14 1958-06-17 Northern Wood Barking Mfg Co Apparatus for rotating and transporting logs during broadside attack by bark-removing chains
AT212556B (de) * 1958-12-09 1960-12-27 Sirius Gruenbach Ag Fuer Ind Einrichtung zur Zentrierung runder Werkstücke auf eine Einspannachse
DE1162539B (de) * 1959-01-15 1964-02-06 Kralovopolska Strojirna Zd Y C Zentriervorrichtung fuer Furnierschaelmaschinen mit Hebevorrichtungen zum Heben der Kloetze zwischen die Spindelspitzen
DE1195932B (de) * 1959-08-14 1965-07-01 Roller Maschinenfabrik A Zentrier- und Beschickungseinrichtung fuer Furnier-Schaelmaschinen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664395A (en) * 1970-04-03 1972-05-23 Salem Equipment Inc Log pre-centering apparatus for veneer lathes
US3945125A (en) * 1970-04-27 1976-03-23 Weldwood Of Canada Limited Apparatus and method for centering logs for veneer processing
US3760855A (en) * 1970-09-14 1973-09-25 R Nilberg Apparatus for centering irregular peeler logs
US3895662A (en) * 1971-07-13 1975-07-22 Taihei Seisakusho Kk Apparatus for preshaping raw logs
US3902539A (en) * 1973-02-08 1975-09-02 Keller & Co Masch C Apparatus for centering the longitudinal axis of a log on a reference axis
US3891016A (en) * 1973-06-14 1975-06-24 Reinhold Hermann Nilberg Apparatus for centering irregular peeler logs
US4197888A (en) * 1978-02-21 1980-04-15 The Coe Manufacturing Company Log centering apparatus and method using transmitted light and reference edge log scanner
US4289051A (en) * 1979-05-23 1981-09-15 Acme-Cleveland Corporation Object centering and moving mechanism
US4427044A (en) 1981-06-30 1984-01-24 Pigott Enterprises Log centering device

Also Published As

Publication number Publication date
DE1528340A1 (de) 1970-09-24
DE1528340B2 (enrdf_load_stackoverflow) 1973-09-13
DE1528340C3 (de) 1974-04-11

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