JPH04241901A - Method and apparatus for feeding lumber in sawmill machinery - Google Patents

Abstract

PURPOSE:To make the retaining of scantling reliable as compared with a conventional lumber feed apparatus and automate a series of lumber feed operations by holding the scantling between a pressing arm pressed down and feed rollers and carrying out the transfer of the lumber while retaining it reliably. CONSTITUTION:A pressing arm 23 of a subsequent retaining device unit 20a is actuated just before scantling A is completely sawn, and a working member 42 positioned at the top end of the pressing arm abuts against the scantling A to retain it. By retaining the scantling A at its two points in such a manner, a strip line L can be maintained. Return lumber A2 is transferred to the starting end part of a lumber return line 15 and driven by a feed roller 13 to be transferred to the terminal end part of the lumber return line 15. According to the elevation of a connecting conveyor 17 located under the feed roller 13, the return lumber is transferred to the starting end part of a lumber feed line 14 by the connecting conveyor 17, and a series of sawing steps is repeated until sawing becomes impossible.

Description

[Detailed description of the invention]

0001

[Purpose of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sawmill equipped with a sawmill called a ripsaw, and more particularly to a method and apparatus for feeding sawn material before and after sawing.

0002

BACKGROUND OF THE INVENTION For example, in sawing planks or the like from sawn timber, a sawmill machine body such as a single sawmill or a double sawmill machine is used, and a material feeding device is combined around it to form a series of sawmill machines. A predetermined sawing process is carried out while feeding sawn material in a circular manner.

[0003] However, in order to feed raw material before sawing into the main body of a sawmill, it is still necessary to manually touch the side of the sawn material against a ruler on the main body of the sawmill, and then place the sawn material on the feeding frame. The sawn material is fed while keeping it in line with the material feeding direction. Therefore, complete automation has not been achieved in cyclically transporting the sawn material.

[0004] In addition, in the next step, the sawn timber sawn and split by the sawmill main body is sorted into product material, returned material, or waste material, as shown in FIG.
A sorting guide plate 35 was provided from immediately after the saw blade 7 to the sorting device 3' in an attempt to maintain the sawing line, but it could not be said that the sawing line was maintained reliably.

Furthermore, the sawn material A originally has internal stress (so-called ate), and even if the end of the sorting guide plate 35 faces directly behind the saw blade 7, it will not bend or twist immediately after sawing. In the case of the resulting sawn material A, Fig. 10(b)
As shown in the figure, the tip may collide with the sorting guide plate 35, making it impossible to transport the sawn material A in a straight line, and as a result, not only can the next step of sorting work not be carried out, There was an inconvenience that the sorting guide plate 35 would be damaged. Incidentally, under normal usage conditions, the sorting guide plate 35 must be replaced every three months or so due to collisions with sawn materials.

[0006]

[Technical matters attempted to be developed] The present invention has been developed in view of this background, and it involves supplying sawn sawn material to the main body of a sawmill, and processing the sawn material sawn and split by the sawmill main body for the next process. This is an attempt to develop a method and device for transporting sawn material in a new sawmill that reliably holds the sawn material and transports it in a straight line while maintaining the sawing line when transporting it to the location where sorting work is performed. be.

[0007]

[Structure of the invention]

[Means for achieving the purpose] The material feeding method in a sawmill, which is the first invention related to the present application, is such that a material feeding frame supporting the lower surface of the sawn material is provided at the front and rear of the main body of the sawmill machine, and the sawn material is In the method of transporting the sawn material on a feeding frame while performing sawing, the sawn material is transferred while being held in all or part of the transfer range by a holding member that moves upward together with the sawn material. It is characterized by:

[0008] In addition, the material feeding device for a sawmill, which is the second invention related to the present application, is provided with a material feeding frame that supports the lower surface of the sawn material at the front and rear of the sawmill main body, and In a device that transfers the material on a feeding frame while performing the above-mentioned material feeding frame, the material is transferred at a constant speed while the sawn material is pressed against the material feeding frame above the entire area or a part of the material feeding frame. The device is characterized by being provided with a pressing arm that moves linearly in the direction.

Furthermore, the third invention of the present application is a material feeding device for a lumber machine, which is characterized in that, in addition to the above-mentioned requirements, a plurality of the pressing arms are provided so as to move cyclically relative to each other. It is. These inventions attempt to achieve the above object.

0010

[Operation of the invention] In the present invention, the sawn material before and after sawing is
The sawed and split material is reliably held by being held between the material feeding frame supporting the lower surface and the pressing member acting on the upper surface. In addition, when a plurality of pressing arms are provided so as to move in a circular manner, the pressing arms that circulate in sequence will act one after another on the sawn material that is continuously fed out, causing the feeding of the sawn material to be interrupted. High-speed feeding is possible without any problems.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A material feeding method and apparatus for a sawmill according to the present invention will be explained in detail below with reference to the drawings.

[0012] In the explanation, first, the material feeding device of the present invention will be explained along with an overview of a sawmill to which this device is applied, then other embodiments of the material feeding device, and finally, a book using these material feeding devices will be explained. The material feeding method of the invention will be explained.

In the drawing, the reference numeral 1 indicates the material feeding device of the present invention, which includes a sawmill main body 2 for actually sawing and splitting the sawn material A, and a sawn material A1 and a return material. It forms the main components of the sawmill 5 together with the sorting device 3 that sorts into A2 and waste material a, supplies the sawn sawn material A to the sawmill main body 2, and sends the sawn material A sawn and split by the sawmill main body 2 to the next It plays the role of transporting to the sorting process.

As shown in FIGS. 1 to 3, the sawmill main body 2 includes a saw blade 7 consisting of a circular saw blade or a band saw blade, a sawing motor M1 that drives the saw blade 7, and a sawing and splitting motor M1 that connects the two. It comprises a transmission member 8 consisting of a belt, pulley, etc. that transmits the power of M1 to the saw blade 7, a holding roller 9 that holds the sawn material A in the middle of sawing, and a ruler 10 that serves as a reference for determining the sawing size. .

[0015] The sorting device 3 sorts the sawn material A sawn by the sawmill main body 2 into product material A1, return material A2, and waste material a as described above, and transports the sawn material A in a predetermined direction. It is provided between the terminal end of the outward material feeding line 14 and the starting end of the backward material feeding line 15, which constitute the material feeding device 1 in the lumber machine of the present invention, which will be described later. Here, the terminal end of the outgoing material feeding line 14 is defined as
The end opposite to the sending-out side of the sawn material A (this is referred to as the starting end of the outward material feeding line 14), and the starting end of the return material feeding line 15 refers to the end where the sawn material A advances. This refers to the end adjacent to the terminal end of the outgoing material feeding line 14 according to the direction (this time in the opposite direction to the outgoing material feeding line 14), and the opposite end is the opposite end of the returning material feeding line 14. It is called the terminal part.

The sorting device 3 also has rotating shafts 31 on the sides of the terminal end of the forward material feeding line 14 and the starting end of the backward material feeding line 15, and the feeding is performed using the rotating shafts 31 as rotational fulcrums. It rotates so as to appear and retract between the rollers 13, and the sawn material A is moved in a direction perpendicular to the traveling direction of the sawn material A by a chain drive.
and a sorting unit 34 having a sorting piece 33 which also moves between the feed rollers 13 and directly sorts sawn material A into product material A1, return material A2, waste material a, etc.

Further, the material feeding device 1 in a sawmill according to the present invention includes a material feeding pedestal 12 formed by appropriately combining angle materials, etc., as shown in FIGS. 1 to 3, and an upper rectangular frame of this material feeding pedestal 12. The main components include a feed roller 13 that is supported in an idling or actively driven state, and a feed motor M2 that drives this feed roller 13, and is provided extending back and forth across the sawmill main body 2. It consists of a transfer device 16 consisting of an outgoing material feeding line 14 and a returning material feeding line 15 arranged side by side along the outgoing material feeding line 14, and a holding device 20 described below. .

The holding device 20 is a part constituting a characteristic structure of the present invention, and as shown in FIGS. A single holding device 20 slides on a rail 21.
It consists of a. This holding device unit 20a is provided with a pressing arm 23 in a swinging state with respect to a slider 22 that is slidably guided by a guide rail 21, and furthermore, this pressing arm 23
A pressing cylinder 24 is provided on the slider 22 so as to be able to swing in the same way, and a cylinder rod 25 of this pressing cylinder 24 is rotatably supported on one end of the pressing arm 23. A part of the piece 26a of the transfer chain 26 is fixed, and the slider 22 is moved along the guide rail 21 by the drive of the transfer chain 26.
It is designed to be able to slide on top. In addition, the holding device alone 2
It is also possible to provide not only one but two or more 0a per guide rail 21 so that they can reciprocate. In addition, when providing multiple units, two reciprocating systems of guide rails 21 are provided as described later, and each holding device single unit 20a
It is also possible to configure the system so that it moves cyclically. Further, this transfer chain 26 is driven by an appropriate relay pulley 2.
7 by the transfer motor M3.

Further, the pressing arm 23 and slider 22, which are the main members of the holding device 20, will be described in detail. First, the pressing arm 23 is provided with a connecting pinch 40 that rotatably supports the end attachment 25a of the cylinder rod 25 in the pressing cylinder 24 at one end of a long plate having a rectangular cross section, for example. A rotation shaft 41 is located at a position slightly moved from the connecting pinch 40 to the other end side.
It has a configuration in which an operating piece 42 that directly contacts the sawn material A is provided on the lower surface of the other end. The action piece 42 is provided with a plurality of angular or tooth-shaped protrusions in order to securely hold the sawn material A.

Furthermore, the number of working pieces 42 is not limited to one, but it is also possible to provide a plurality of working pieces 42. In particular, in the case of double sawing as shown in Fig. 6, it is necessary to maintain two sawing lines L, so in addition to the tip of the pressing arm 23, an actuating piece 42 is provided at one more location in the latter stage of the sawmill main body 2. There is a need. In this case, the working piece 42 located at the upper side in FIG. 6 functions to maintain the fixed scoring line L1, so it may be in a fixed state, but the working piece 42 located at the lower side in FIG. 6 is for maintaining the movable scoring line L2. Therefore, it is necessary to configure the movable sawing line L2 to be able to vary its operating position in response to the movable sawing line L2 which varies depending on the difference in sawing width. In addition, in this case, the upper operating piece 42 in FIG.
Since the height of action of the lower action piece 42 on the sawn material A is different, it is possible to install it on the pressing arm 23 via an appropriate spring or cylinder, or configure the pressing arm 23 with a link mechanism, etc. It is necessary to ensure that appropriate pressure is applied to A.

Further, the slider 22 has a rail holder 45 at its lower part that directly engages with the guide rail 21, and a slider base 46 is disposed on the upper surface of the rail holder 45.
A holding bracket 47 for holding the pressing cylinder 24 in a swinging state is provided below from the side lower surface of the slider base 46, and a holding bracket 47 is provided on the upper surface of the slider base 46 via a suitable support member so as to sandwich the pressing arm 23 therebetween. Pillow blocks 48 are provided and made up of these. Note that the rotation shaft 41 of the pressing arm 23 fits into this pillow block 48 .

Next, another embodiment of the material feeding device 1 in the sawmill of the present invention constructed as described above will be described. That is, this device is a single holding device 20a as shown in FIG.
A plurality of units are installed and these are circulated. In FIG. 7, the structure of the holding device unit 20a is slightly changed from that of the previous embodiment, but this was done because it is necessary to circulate the pressing arms 23 of the holding device unit 20a during movement so that they do not come into contact with each other. Specifically, a bending fulcrum 28 is provided near the center of the pressing arm 23, and the pressing arm 23 is bent at this bending fulcrum 28. By doing this, the pressing arm 2
It is possible to change the working position of the working pieces 42 at the three tips, adjust the pressing force, and avoid contact between the pressing arms 23 that pass each other.

[0023] Also, the single holding device 20 constructed in this manner
As a mechanism for circulating a, an outgoing route 21a and a returning route 21b are arranged side by side next to the transfer device 16, and a connecting route 21c is provided at the end of each route to form a series of circulation routes, as shown in the figure. Although omitted, slider 2 is installed on the connection path 21c.
2 is chucked by a clamp, an electromagnet, a vacuum, etc., and moved between the forward and return paths 21a and 21b, and as shown in FIG. Provided at a location where the connection route 21c is transferred from the connection route 21c, a location where the connection route 21c is transferred to the return route 21b, a location where the return route 21b is transferred to the connection route 21c, a location where the connection route 21c is transferred to the outbound route 21a, etc. As a result, various mechanisms such as a structure for moving between the forward and return routes 21a and 21b can be employed.

Furthermore, the embodiment shown in FIG.
is provided above the outbound material feeding line 14. That is, in the embodiment described above, the guide rail 21 is connected to the outward material feeding line 1.
4, the pressing arm 23 was configured to make an oscillating movement, whereas the pressing arm 23 was configured to make a linear movement by directly utilizing the cylinder rod 25 of the pressing cylinder 24. ing. If a plurality of such holding devices 20a are provided, the details of the mechanism will be omitted, but it will be necessary to move them to the side as shown by the imaginary lines in FIG.

Next, a method for feeding material in the sawmill of the present invention will be explained. First, the raw material before sawing is supplied to the starting end side of the forward material feeding line 14. In addition to the manual method, supply methods include Japanese Patent Application No. 2-9409 "Sawmilling Apparatus" and Japanese Patent Application No. 2-764, which have already been filed by the present applicant.
A method using a feeding device disclosed in No. 98 "Material Feeding Device" can be adopted.

Next, the sawn material A transferred onto the outgoing material feeding line 14 is pressed downward by the pressing arm 23 of the holding device unit 20a located on the starting end side of the outgoing material feeding line 14. , and the feed roller 13. That is, the cylinder rod 25 in the pressing cylinder 24 is extended, and the pressing arm 23 is rotated about the rotation shaft 41 as a fulcrum, and the operating piece 42 at the tip of the pressing arm 23 is rotated.
is held in contact with sawn material A. The sawn material A held by the pressing arm 23 in this manner is guided by the ruler 10 in the main body 2 of the sawmill, and
Transported by. In addition, in line with this, the holding device alone 2
0a is also moved by the drive of the transfer chain 26.

Next, the sawn material A is fed into the sawmill main body 2 by the holding roller 9, where it is sawed and split.
The pressing arm 23 that has been holding the sawn material A until now rotates upward about the pivot shaft 41 as the cylinder rod 25 is retracted, and the holding device 20a returns to its original position on the guide rail 21.

On the other hand, the sawn material A fed into the sawmill main body 2 is held by a single holding device 20a located immediately after the sawmill main body 2.
The first sawn portion of the sawn material A is held by the pressing arm 23 of the machine and transported to the next sorting process.

[0029] Just before the sawn material A is completely sawn, the pressing arm 23 of the next holding device unit 20a operates, and the operating piece 42 at its tip abuts and holds the sawn material A. By holding the sawn material A at two points in this way, the sawn line L can be maintained.

Next, as described above, the two holding devices 20a are
The sawn material A held at two points is further transferred and reaches the terminal end of the outward material feeding line 14. At this time, naturally the holding device 20a also moves in synchronization with this movement. Then, the pressing cylinder 24 is contracted, the pressing arm 23 is rotated upward, the pressing by the action piece 42 is released, and it returns on the guide rail 21 to its original position immediately behind the sawmill main body 2.

Next, a sorting unit 34 as shown in FIG.
The sorting piece 33 rises due to the extension of the cylinder and sorts the transferred sawn material A into product material A1, return material A2, waste material a, etc. Then, the transfer conveyor unit 32 rises, floats each member above the feed roller 13, and transfers the members in a predetermined direction by driving the conveyor chain. Of these, the returning material A2 is transferred to the starting end of the return material line 15, driven by the feed roller 13, and transferred to the terminal end of the return material line 15, where it is located below the feed roller 13. As the connecting conveyor 17 rises, the connecting conveyor 17 moves the material to the starting end of the outgoing material feeding line 14, and the series of steps described above is repeated until it becomes impossible to saw.

Next, the material feeding method in the case of the embodiment shown in FIG. 7 will be explained. In other words, in this case, the outbound material feeding line 1
The holding device unit 20a located on the side acts on the sawn material A supplied to the starting end of No. 4 to hold it. Specifically, the pressing arm 2 is driven by the pressing motor M4.
3 rotates, and the bending fulcrum 2 is rotated by the contraction of the telescopic cylinder 29.
Bend the pressing arm 23 inward about 8. Then, the action piece 42 at the tip of the pressing arm 23 is brought into contact with the sawn material A, and the sawn material A is held, and while the sawn material A is held, the feed roller 13 is guided by the ruler 10 in the sawmill main body 2. transported by.

Next, the sawn material A is sent into the sawmill main body 2 by the holding roller 9, where it is sawed and split.
The pressing arm 23, which has been holding the sawn material A until now, rotates diagonally backward from above by the action of the pressing motor M4 and the telescopic cylinder 29, and on the way back about the bending fulcrum 28, the forward path 21a A single holding device 20 that travels
It is folded so as not to get in the way of the pressing arm 23 at point a.

Next, the holding device 20a released from holding the sawn material A in this manner is moved from the outgoing path 21a to the connecting path 21c, and then to the return path, and is moved to the starting end of the outgoing material feeding line 14. It is returned to the side position and further connected to the connection path 21.
It is transferred again to the outgoing route 21a via the route 21a, and is provided to the sawn material A to be transferred next.

On the other hand, the sawn material A fed into the sawmill main body 2 is held by the pressing arm 23 of the holding device unit 20a located immediately behind the sawmill main body 2, so that the first sawn portion of the sawn material A is held. , and then transported to the next sorting process.

With the sawn material A being held in this way, the holding device 20a is moved in synchronization with the transfer of the sawn material A.
moves. Next, just before the sawn material A is completely sawn by the sawmill main body 2, the pressing arm 23 of the next holding device 20a comes down, and the action piece 42 at the tip of the pressing arm 23 moves the sawn material A.
Abut against and hold.

[0037] In this way, the two holding devices 20
The sawn material A held at point a is transferred toward the terminal end of the forward material feeding line 14, and is stopped when it reaches the terminal end. Next, the pressing motor M of each holding device unit 20a
4 and the telescopic cylinder 29, the pressing arm 23 rotates diagonally backward from above, and at the same time, the pressing arm 23 in the holding device unit 20a traveling on the outbound path 21a about the bending fulcrum 28 on the way back. Folds up so it doesn't get in the way.

Next, in the same manner as in the embodiment described above, by the action of the sorting unit 34 and the transfer conveyor unit 32 in the sorting device 3, the sawn material A is divided into product material A1, returned material A2, and waste material a.
etc., and transported in a predetermined direction. In the present invention, when receiving this sorting, the sawn material A
The sawing line L in is reliably held at a constant position by the pressing arm 23 of the holding device 20. Of these, the returned material A2 is transferred to the starting end of the forward material feeding line 15 in the same manner as in the previous embodiment, and the series of steps described above are repeated until it becomes impossible to saw.

At this time, the holding device 20a is moved from the outgoing route 21a to the connecting route 21c, and then to the return route, returned to the position immediately behind the sawmill main body 2 on the outgoing material feed line 14, and further connected. It is transferred again to the outgoing route via the route 21c, and is added to the sawn material A to be transferred next.

As described above, in the case of the present embodiment shown in FIGS. 7 and 8, instead of reciprocating on the same guide rail 21 as in the previous embodiment, the forward route 21a and the return route 2
1b and the two connecting paths 21c, the holding device 20 does not have to be stopped until one stroke is completed, and the sawn material is fed one after another at high speed. A can also be dealt with. Specifically, if the same work is to be carried out consecutively, it is possible to feed three sawn timbers onto the largest sawmill line.

Next, the material feeding method in the case of the embodiment shown in FIG. 9 will be explained. In this case, the sawn material A supplied to the starting end of the outgoing material feed line 14 is pressed by the extension of the cylinder rod 25 of the pressing cylinder 24 in the holding device unit 20a located above it, and is pushed by the feed roller. 13. The sawn timber A thus held is fed into the sawmill main body 2 while being guided by the ruler 10 in the sawmill main body 2.

On the other hand, the holding device alone 20a is attached to the sawmill main body 2.
When the cylinder 25 of the pressing cylinder 24 reaches the position immediately before
The material is contracted, the pressure is released, the material is guided by the guide rail 21, and the material is returned to its original position above the starting end of the outward material feeding line 14. In addition, in the case where a plurality of holding devices 20a are provided in the embodiment shown in FIG. The device unit 20a temporarily retreats to the side, avoids collision with the next moving holding device unit 20a, and is returned to the starting end side of the outward material feeding device 14 in this state.

After that, as in the previous embodiment, the sawn material A is sawn by the sawmill main body 2, and the sawn material A is sawed and split by the sawmill main body 2, and the sawn material A is split by the sawing machine main body 2 to the end of the forward material feed line 14 by the holding device 20 located immediately after the sawmill main body 2. It is sent with L maintained, and it is sent to sorting unit 3.
4 and the transfer conveyor unit 32, and are transferred in a predetermined direction. Of these, the returning material A2 is transferred to the starting end of the returning material feeding line 15, driven by the feed roller 13 on the returning material feeding line 15, and transferred to the terminal end of the returning material feeding line 15. conveyor 17
The material is then moved to the starting end of the outward material feeding line 14. The series of steps described above is then repeated until it becomes impossible to grind.

[0044] In the embodiment described above, the cutting line L
1 is maintained only by pressing by the action piece 42 of the pressing arm 23 in the holding device 20A.
A sorting guide plate 35 as shown in 0(a) is not particularly provided, and it is expected that sorting methods will be diversified and simplified, but of course,
It is also possible to use it together with the sorting guide plate 35.

[0045]

[Effects of the Invention] The present invention has the above-described structure, and exhibits the following effects. That is, since the sawn material A is transferred while being reliably held by pressing the pressing arm 23 downward and sandwiching it between the feed roller 13, this system is better than conventional material feeding devices. This retention becomes reliable, and it becomes possible to automate a series of material feeding operations. In addition, since the sawn material A can be transported linearly while the warping, bending, twisting, etc. caused by the internal stress of the sawn material A is corrected, even when the sorting guide plate 35 is provided, the sawn material A can be transported straightly. Material A does not come into contact with the sorting guide plate 35 and damage the sorting guide plate 35.

[0046] Furthermore, if a plurality of holding devices 20a are provided and configured to move cyclically, it is possible to handle the sawn material A that is sent one after another, and high-speed operation is possible. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a sawmill to which a material feeding device of the present invention is applied.

FIG. 2 is a plan view of the same as above.

FIG. 3 is a front view of the same as above.

FIG. 4 is an enlarged side view of the holding device alone.

FIG. 5 is an enlarged front view showing a holding device at the front stage of the sawmill main body.

FIG. 6 is a skeletal plan view showing a series of transport states of sawn material.

FIG. 7 is a perspective view showing another embodiment of the holding device.

FIG. 8 is a plan view and two partial sectional views showing an example of a connection path when using the same device as above, and two types of partial sectional views with different breaking directions.

FIG. 9 is a perspective view showing still another embodiment of the holding device.

FIG. 10 is a perspective view showing a conventional method of feeding sawn material and its problems.

[Explanation of symbols]

1 Material feeding device 2 Sawmill main body 3 Sorting device 5 Sawmill 7 Saw blade 8 Transmission member 9 Holding roller 10 Ruler 12 Material feeding frame 13　Feed roller 14 Outbound material feeding line 15 Return material feeding line 16 Transfer device 17 Communication conveyor 20 Holding device 20a Holding device alone 21 Guide rail 21a Outbound route 21b Return route 21c Connection route 22 Slider 23 Pressing arm 24 Pressing cylinder 25 Cylinder rod 25a End attachment 26 Transfer chain 26a Piece 27 Relay pulley 28 Bending fulcrum 29 Telescopic cylinder 31 Rotation axis 32 Transfer conveyor unit 33 Sorting pieces 34 Sorting unit 35 Sorting guide board 40 Connection pin 41 Rotation axis 42 Working piece 45 Rail holder 46 Slider base 47 Holding bracket 48 Pillow block 50 Push cylinder A　Sawn wood A1 Product material A2 Return material a Waste material L Grind line L1 Fixed score line L2 Movable sawing line M1 Split motor M2 feed motor M3 Transfer motor M4 Press motor

Claims (3)

[Claims] Claim 1: A method in which a material feeding frame supporting the lower surface of the sawn material is disposed at the front and rear of a sawmill main body, and the sawn material is transported on the material feeding frame while sawing and splitting the sawn material. A method for transporting split lumber in a sawmill, characterized in that the split lumber is transported while being held in all or part of the transport range by a holding member that moves upward together with the sawn split wood. 2. A device in which a material feeding frame supporting the lower surface of the sawn material is disposed before and after a sawmill main body, and the sawn material is transported on the material feeding frame while sawing and splitting the sawn material. A pressing arm is provided above the whole range or a part of the timber frame to press the sawn timber against the material transport frame and move linearly at a constant speed in the direction of transport of the timber. A material feeding device in a sawmill. 3. The material feeding device for a lumber machine according to claim 2, wherein a plurality of said pressing arms are provided so as to move cyclically relative to each other.