JPS646247Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a veneer that turns a sheet-like veneer veneer by holding and rotating the left and right butt ends of the raw material raw material, and using a long blade that spans the entire length of the raw material to bite into the outer circumferential surface of the raw material. This invention relates to a planer stand feeding device that moves a planer stand equipped with a cutting tool forward or backward toward the axis of a log in a race.

Conventional veneer lathes for turning veneer veneers (hereinafter referred to as veneers) are equipped with a spindle that rotates by gripping the left and right end faces of the log, a plane stand equipped with a veneer cutting blade, and a pressure bar. A configuration is commonly used in which a pressure bar body is disposed above a planer stand, and a feed screw that is driven to rotate forward and backward at a predetermined number of rotations is screwed into a planer stand guide fitted to the left and right ends of the planer stand, respectively.

In addition, a gearbox is installed as a "feeding mechanism" that determines the amount of advance of the planer stand (equipped with a veneer cutting blade) for one revolution of the spindle (one revolution of the raw wood) in accordance with the desired thickness of the veneer to be cut. Rotation is transmitted by a transmission mechanism branched from the rotational drive system of the spindle.

A gearbox consists of a group of gears with various numbers of teeth, and after selecting a combination suitable for the thickness of the veneer to be cut and meshing them, the rotation, so-called "step feed", is transmitted to the feed screw.

Furthermore, after the spindle has gripped the log, the planer stand can be brought rapidly close to the log, or after the log has been cut, the planer stand can be quickly retreated in preparation for carrying in the next log. The mechanism is such that the feed screw can be rotated in forward and reverse directions as appropriate.

On the other hand, the aforementioned "step feed" and "rapid feed" that transmit rotation to the feed screw have different rotational speeds, and their transmission systems must not interfere with each other. Therefore, it is essential to interpose a clutch or the like between the two so that rotation is always transmitted to only one of the two.

To clarify the actual state of work in the conventional veneer lace as described above, in the "rapid forward" operation after gripping the log, there is an extremely high risk of a collision with the log due to the desire to start cutting the veneer as soon as possible due to the planer head moving too far forward. To avoid danger, a relatively low-speed electric motor was used for "rapid forwarding," which meant that it took time to retreat the planer stand after cutting one log, and it took time to bring in the next log.

Furthermore, if the clutch mechanism that is interposed between "step feed" and "rapid feed" is not started after confirming that one of them is disengaged, it will lead to damage to the transmission system. This is a factor that reduces work efficiency.

In this invention, the "rapid forward" operation of the planer head is performed by a motor that can change the speed according to the purpose, for example, with a change in pole number. It is characterized by incorporating a moving gear device. An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 1 is a schematic representation of the veneer lace plane head feed transmission system. Reference numeral 1 denotes raw wood that is the raw material to be cut. During veneer turning, the left and right butt ends of the wood are held by a spindle 3, and the spindle is connected to the main electric motor 1.
1, it is rotationally driven in the direction of arrow A.

20 is a plane stand with a long veneer cutting blade 2 at the top tip.
1 is equipped. 30 is a pressure bar body with a pressure bar 31 attached to the lower tip,
It is placed above the planer stand. A planer stand guide 25 is fitted to the left and right ends of the planer stand, and the planer stand is configured to be able to advance toward or retreat toward the log 1 integrally with the pressure bar body 30 by rotation of a feed screw 22 screwed into the planer stand guide. There is.

23 is a bevel gear locked to the end of the feed screw shaft and meshes with the bevel gear 24 of the counter shaft 40;
It transmits and receives rotation from each transmission system. Note that the feed screw, bevel gear, and counter shaft are normally arranged within the left and right frames of the veneer race, respectively, and are rotatably supported.

50 is a step feed motor using a variable speed motor such as DC variable speed control, and is equipped with a brake device (not shown) at the end of the shaft, etc., to prevent the step feed transmission system from idling when only "rapid feed" described later is activated. There is. 50C is a chain wheel attached to the shaft end of the feed motor, and transmits rotation to the differential gear device.

The above-mentioned gait-feeding motor and brake device constitute a ``gait-feeding mechanism.'' However, when modifying a conventional veneer race based on the present invention, an existing gearbox consisting of a group of gears can be used as a ``gait-feeding mechanism.'' In the embodiment shown in FIG. 1, a gearbox is placed in place of the walking motor 50, and a brake device is also provided at the same time.

FIG. 2 is a cross-sectional view of the left frame viewed from the rear, showing details of the differential gear device 70.

The differential gear device 70 consists of a lantern-shaped differential gear box 70G and elements that will be described later incorporated into the box.
It's tight.

52 is a differential gear case, and differential gear box 7
Insert the inside of 0G and attach the bearing 70 to one end.
B is fitted onto the outside and is rotatably supported on the box. A chain wheel 51 is engaged with one end protruding into the left frame F (on the right side in FIG. 2) via a key 51K, and a bevel gear 66 is inserted into the inner diameter portion of the opposite side via a key 66K. has been done.

Furthermore, a bush 6 is provided on the inner diameter of the bevel gear 66.
6B is fitted to support the rapid feed shaft 64 which is supported by passing through the differential gear box 70G. Further, a cross shaft 54S is engaged with a key 54K approximately in the middle of the fast-forwarding shaft, and the cross shaft supports freely rotatably the bevel gear 66 and a planetary bevel gear 54 that meshes with a gear 55, which will be described later, at the end of the shaft. That's what I'm doing.

The bevel gear 55 has a button 5 on the rapid feed shaft 64.
The differential gear case 52 is pivotally connected to the outer peripheral surface of a bush 52B, which is rotatably supported via the bushing 5B and fixed to the outer peripheral surface of the bush 52B. Further, the shaft end of the bevel gear 55 on the side opposite to the tooth surface has a smaller diameter and projects from the differential gear box 70G past the chain wheel 51, and a coupling ring 45 is fixed to the end.

Reference numeral 60 denotes a fast-forward motor, which is capable of large speed changes in a short period of time, such as by changing the number of poles. 63
is a worm wheel which is rotatably attached to a rapid traverse shaft 64 mounted in the differential gear device by a key 63K,
It meshes with a worm 62 that is pivotally supported on the lower side of the differential gear box 70G. The worm 62 is rotationally driven by a fast feed motor 60 by belt transmission or other appropriate means to rotate the worm wheel forward and backward.

68 is a brake device installed at the end of the shaft of the worm 62, etc., and brakes the worm wheel 63 to prevent it from idling under the influence of the rotational drive of the transmission system during "step-feeding" of the planer stand. It is something to do. The above-mentioned fast-forward motor 60 and brake device 68 constitute a fast-forward mechanism.

Reference numeral 44 denotes a common feed shaft that passes through the left frame F and is supported, and one end (on the left side in Fig. 2) is connected to the differential gear device via the aforementioned coupling ring 45, and the other end protrudes outside the frame. , is further connected to the right frame side through a relay of a coupling ring 44M that is engaged with the coaxial end, and is connected to a transmission shaft (not shown) that is pivotally supported by the right frame so that its axis is aligned.

Further, a chain wheel 44C is pivotally attached to the feed common shaft 44 by a key, and communicates with a chain wheel 40C that is locked to a counter shaft 40 disposed above and parallel to the same shaft through a chain. The bevel gear 24 described at the beginning is pivotally attached to the end, and the feed screw 22, which has a bevel gear 23 meshing with the bevel gear 23 at the end of the shaft, is rotated 90 degrees and pivoted horizontally.

Note that the differential gear device 70 is disposed only on either the left or right side of the frame, and the above-mentioned coupling 4
The conduction path starting from the transmission shaft located on the right frame side (not shown) connected via 4M to the feed screw 22 has the same configuration and is also installed on the right frame side, and the left and right feed screws rotate in synchronization. It will be driven.

That is, both the above-mentioned "step feed mechanism" and "rapid feed mechanism" have their rotations controlled by the differential gear device 7.
0 is input once, and the differential device rotates the feed common shaft 44 at the required rotation speed to achieve the purpose.

An embodiment of the present invention having the above configuration will be described.
In the "step feed" planer stand compatible with cutting veneer, the brake device 68 of the rapid feed mechanism is first activated to brake the worm wheel 63, etc., and then the brake device of the step feed mechanism is released, and then the step feed electric motor 50 is activated. starts at a rotation speed that matches the required thickness of the veneer. The rotation is transmitted from the chain wheel 50C to the chain wheel 51 at the starting end of the differential gear device 70 in the direction of arrow C. Subsequently, the bevel gear 66 is rotationally driven via the differential gear case 52, and the planetary bevel gear 54 that meshes with the bevel gear 66 rotates.

Note that here, the brake is working on the fast forwarding mechanism and the worm wheel 63 cannot rotate, so the key 63K is pressed.
The fast-forwarding shaft 64 is kept stationary through this, and the cross shaft 54S keyed to the same shaft also remains fixed.Therefore, the two planetary bevel gears 54 pivotally supported at the tips of the same shaft are controlled by the rotation of the bevel gear 66. The rotation is directly transmitted to the bevel gear 55 which freely rotates in synchronization with the bevel gear 55 and meshes with other tooth surfaces.

The bevel gear 55, which has received the rotational driving force, is connected to the feed common shaft 4 via the coupling ring 48 at its end.
4 to transmit the rotation from the coupling 44M to the transmission shaft of the right frame. Furthermore, the counter shaft 40 is driven via the coaxial chain wheels 44C to 40C, and subsequently the left and right feed screws 22 are synchronously driven to rotate via the bevel gears 24 to 23.

Furthermore, the left and right planer stand guides 2 are screwed together with feed screws.
5, by rotating the same screw, ``feed'' the plane stand 20 equipped with a veneer cutting blade toward the axis of the log 1.
It is moved forward and a predetermined veneer is turned and produced.

Next, to explain "fast forwarding", first the brake device 68 of the rapid forwarding mechanism is released, then the brake device of the step forwarding mechanism is activated, and then the fast forwarding electric motor 60 is started. The worm wheel 63 is rotated from the worm 62 of the gear device 70, and the fast-forward shaft 64 is rotated in forward and reverse directions using the key 63K.

Subsequently, the cross shaft 54S is rotated within the differential gear case 52 by the key 54K. At this time, since the brake is working on the walking mechanism, the cheerer wheel 51 is kept in a stopped state, the differential gear case 52 is stopped by the key 51K, and the bevel gear 66 cannot be rotated by the key 66K. becomes. Therefore, due to the cross-axis rotation, the planetary bevel gear 54 at the end of the shaft rotates around its own axis while meshing with the gear 66 in a stationary state, and the bevel gear rotates along with the cross-axis, meshing with other tooth surfaces. 55 to transmit rotation.

The rotation of the bevel gear 55 rotates the feed common shaft 44 via the coupling ring 45 at the end of the shaft, and thereafter the planer stand is rapidly approached or separated from the raw wood along the same path as the step feed.

To explain an example using a fast-forwarding motor with a 4-pole motor and a 6-pole motor with a change in the number of poles, when the raw wood held by the spindle and the planer stand are far apart, the motor 60 is driven with high-speed rotation of the 4-pole motor to move rapidly forward. Then, approach the log, change gears to the low feed speed of the 6-pole, and turn the planer stand 20.
is advanced to the desired position, and then the brake of the rapid feed mechanism is applied to stop the rapid feed shaft 64, and then step feed is applied, and after finishing the veneer turning, the planer head is retreated to the predetermined position by high-speed rotation of the four poles. .

In addition, as in this embodiment, a worm 6 is installed in the rapid feed mechanism.
If a combination of 2 and worm wheel 63 is adopted and there is a so-called self-locking effect in which the forward rotation from the worm wheel is prevented by the worm, the brake device of the rapid-forward mechanism can be omitted.

Furthermore, as an installation effect of the differential gear device 70,
In addition to eliminating the clutch mechanism that was required mechanically, it is now possible to rapidly move the planer head forward or backward by applying rapid traverse as needed, even during veneer turning using step feed. This is based on the principle of differential gears.When moving forward rapidly, the amount of the step feed is added and the amount of the step forward is added, and when moving backward, the amount of the step feed is subtracted and the speed is slowed down slightly. This is also a much-needed challenge.

According to the device of the present invention described above, the rapid forward and backward movement of the planer head becomes safe and extremely efficient, and the conventionally installed clutch mechanism between step forward and rapid forward is omitted and simplified, and workability is further improved. It will improve further.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the planer head feed transmission system, and FIG. 2 is a detailed sectional view of the differential gear device. 1... Log, 11... Main electric motor, 20... Planer stand, 22... Feed screw, 44... Feed common shaft, 5
0...Step feed motor, 52...Differential gear case,
54... Planetary bevel gear, 54S... Cross axis,
60... Rapid feed electric motor, 68... Brake device,
64... Rapid feed axis, 70... Differential gear device.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a veneer lathe that turns a veneer while holding and rotating raw wood, a planer stand equipped with a veneer cutting blade and a pressure bar body to which a pressure bar is attached are integrally applied to the raw wood. Move forward.
A step-feeding mechanism is equipped with a retracting feed screw and is composed of a step-feeding electric motor and a brake device that rotate according to the predetermined thickness of the cut veneer, and a rapid-feeding mechanism is constituted of a rapid-feeding motor that can rotate at variable speeds and a brake device. comprising: the step-feeding mechanism;
and/or a differential gear device for inputting rotation of a rapid feed mechanism and transmitting the rotation to a feed screw. 2. The feeding device for a planer stand in a veneer lace according to claim 1, wherein the step feeding mechanism is constituted by a gear box having a large number of gears and a brake device. 3. The feeding device for a planer stand in a veneer lace according to claim 1 or 2 of the utility model registration claim, wherein the rapid feeding mechanism is constituted by a pole number changing electric motor and a brake device.