JPH0417319Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention conveys the workpiece while pressing it against the conveying surface using tread pressure rolls placed before and after the sanding section, and conveys the workpiece in a direction that follows the conveyance direction. This invention relates to a fly-out prevention device for preventing workpieces from flying out to the rear by a sanding belt in a down-sanding automatic feed belt sander that sands workpieces with an endlessly running sanding belt.

<Conventional technology> Conventionally, the workpiece is sanded while being pressed against the material feeding surface using freely rotating tread rolls placed before and after the sanding section. The running force of the belt causes the material to slip on the material feeding surface in the rear direction, resulting in a situation where it flies out to the rear. Also, when the processed material passes through the tread pressure roll placed at the front of the sanding section and becomes only the tread force of the tread pressure roll placed at the rear,
The conditions for ejection can become extremely dangerous, and the ejection can also damage the processed material. Therefore, it was necessary to have a structure to prevent it from flying out.
-6491 exists, but in this one, the feed rolls provided on the upper side are made to have the same speed, and the feed rolls provided on the bottom side are also made to have the same speed. Yes, but
It is known that the lower feed roll is fixed and the upper feed roll is in elastic contact with the lower feed roll.

<Problems to be Solved by the Invention> However, in the above-mentioned method, since the material feeding gap is limited, sanding can only be carried out on thin sheets, and it is difficult to perform sanding on thick materials.

The present invention improves the conventional technology so that it is possible to feed and sand from thin plates to thick plates or pillars without causing them to fly out.

<Means for Solving the Problems> The device for preventing workpieces from flying out of a belt sander according to the present invention includes a sanding section provided in an elevating frame, and a freely rotating tread force placed before and after the sanding section via a bullet. The work material is fed while being pressed against the material feeding surface by a roll, and a feed roll set at the same speed as the material feeding speed is provided above the material feeding surface, and the sanding part runs endlessly in a direction that follows the material feeding direction. In an automatic feed belt sander that uses a sanding belt to sand down workpieces, a shaft is rotatably installed in a tread roll frame provided at the rear of the sanding section via a bearing, A drive tread pressure roll is rotatably provided by engaging a pair of left and right roll support members to the shaft, and the shaft and the drive tread pressure roll are connected by a drive connection means such as a chain or a belt, and the roll support member The treading roll frame is equipped with a bullet that engages with the treading roll frame, and the driving treading roll can be elastically levitated around the axis by the pressure of the material to be processed.On the other hand, a fixed gear is attached to the shaft of the feeding material driving roll. A rotary arm support is provided that is rotatable, a rotary arm is attached to the rotary arm receiver, an intermediate gear bearing is provided at the tip of the rotary arm, and an intermediate gear shaft having an intermediate gear fixed to the intermediate gear bearing is rotatably mounted. The intermediate gear is fitted and provided in mesh with the gear, the intermediate gear rotates around the gear while meshing with the gear, and the connecting arm is brought into sliding contact with the intermediate gear bearing and the bearing provided on the tread pressure roll frame. Installation, the intermediate gear bearing and the bearing are connected so that the rotating arm and the connecting arm can freely expand and contract in a dogleg shape around the intermediate gear shaft, and furthermore, the intermediate gear bearing is connected to the bearing, and the rotating arm and the connecting arm are made to be able to freely expand and contract in a dogleg shape around the intermediate gear shaft. By connecting the intermediate gear shaft of the intermediate gear and the shaft of the bearing, when the elevating frame moves up and down, the intermediate gear rotates around the gear and absorbs the amount of elevation according to the amount of elevation, and the material feeding drive roll It is characterized in that the drive of the shaft is transmitted to the drive tread pressure roll.

<Function> The rotating arm on the material feeding roll shaft side and the connecting arm on the chain connecting side are attached in sliding contact with each other at the connecting part, so when the lifting frame equipped with the sanding part, driving treading roll, etc. moves up and down, ,
Depending on the amount of elevation, the intermediate gear rotates around the gear while meshing with the gear and moves up and down, absorbing the amount of elevation of the elevating frame. Therefore, the relationship between the rotating arms and the connecting arms of both of them is such that they contract and expand in a dogleg shape around the intermediate gear, and the drive of the material feed drive roll shaft is transmitted to the drive tread pressure roll at the same speed, so that the drive tread pressure is reduced. The roll always presses the surface of the workpiece to be fed at the same speed as the feed drive roll.
The workpiece is fed smoothly to prevent the workpiece from flying out, and the driving tread pressure roll is provided with a bullet to further prevent the workpiece from flying out.

<Example> An embodiment of the present invention will be described with reference to the accompanying drawings. A material feeding frame 2 is arranged on the upper side of the frame 1, a material feeding driven roll 3 is provided in the front part, and a material feeding driving roll 4 is provided in the rear part. An endless material conveying belt 5 is provided over both rolls 3 and 4, and a frame 1 is provided.
A vertical frame 6 is disposed on the side of the upper surface, and a first elevating frame 7 is provided in the front part of the vertical frame 6 so that it can be raised and lowered freely. As shown above, a tension driven roll 9 is provided at the upper part and a driving roll 10 is provided at the lower part. An endless sanding belt 11 is wrapped around both rolls 9 and 10, and an explosive device such as a spring is attached to the front and rear of the sanding belt 11. A first sanding section is provided in which freely rotating tread pressure rolls 13a and 13b are disposed through the vertical frame 6, and a second sanding section is provided at the rear of the vertical frame 6.
An elevating frame 14 is provided to be able to rise and fall freely, and 15 is a lifting handle thereof.A tension driven roll 16 is provided at the upper part of the frame 14 so as to correspond to the material feeding surface of the material feeding belt 5, and a driving roll is provided at the lower part of the frame 14. 17, an endless sanding belt 18 is wrapped around both rolls 16 and 17, and a treading roll 2 that freely rotates via an elastic device 19 such as a spring in front and behind it.
A second sanding section is provided in which the sanders 0a and 20b are arranged.

Further, a treading roll frame 21 is provided at the rear of the second elevating frame 14, and a shaft 24 is rotatably provided on the treading roll frame 21 via bearings 25, 26, and a pair of left and right rolls are supported on the shaft 24. A drive treading roll 29 is rotatably provided by engaging the members 22 and 23, and the tip of the shaft 24 is connected to the bearing 2.
A sprocket 27 is fixed to the tip of the sprocket so as to protrude on the 5 side, and a sprocket 28 is also fixed between the bearing 25 and the roll support member 22. The drive tread pressure roll 29 has a rubber surface or the like formed on its periphery, and has shaft ends 30 and 31 that are fixed and protruded from both ends, and the shaft end 30 side is made to protrude, and a sprocket 32 is fixed to the protruding tip. An endless chain 33 is provided around the sprockets 28 and 32 so that the driving tread pressure roll 29 is rotated by the rotation of the shaft 24. Furthermore, the roll support member 22,
23 and the gap between the upper part of the treading roll frame 21, elastic devices 34 and 35 such as springs are provided respectively, and threaded rods 36 and 37 are inserted loosely from the treading roll frame 21 side to support the roll supporting member 2.
2 and 23, respectively, and the threaded rods 36,
Nuts 38 and 39 are screwed and tightened to 37, so that the gap is regulated via a bullet.

Further, the material feeding drive roll shaft 40 of the material feeding drive roll 4
A rotary arm support 42 with a rotary arm 41 attached thereto is rotatably fitted through a bearing 43, and an intermediate gear shaft 44 is rotatably connected through a bearing 45, with both ends protruding from the intermediate gear bearing 46. and insert the intermediate gear bearing 46 into the intermediate gear shaft 4.
4 is attached to the rotating arm 41 so that one end of the protrusion is inside the rotating arm 41 and the other end is outside the rotating arm 41.
An intermediate gear 47 is wedged onto an intermediate gear shaft 44 disposed inside and locked with a nut 48. Then, a gear 51 is fixed to the driven flange 49 via a bolt 50, the driven flange 49 is wedged together with the gear 51 to the material feeding drive roll shaft 40, the gear 51 is meshed with the intermediate gear 47, and the intermediate gear 47 can rotate around the gear 51. On the other hand, a drive flange 54 is wedged on the drive shaft 53 of the material feeding drive motor 52, and both flanges 49 and 54
It consists of a flange joint which is tightened and connected by a plurality of bolts 56 with a spacer 55 in between, and the drive is interlocked. The connecting arm 57 is attached in sliding contact with the bearing 25 and the intermediate gear bearing 46, and the intermediate gear bearing 4
6 and the bearing 25 are in a connected state, the connection part is in a sliding contact shape, the sliding contact surfaces are 58 and 59, and the intermediate gear shaft 44 provided with the intermediate gear 47
A sprocket 60 is fixed to the other side, and the chain 6 is connected to the sprocket 27 and the sprocket 60 through an idler roll 61 disposed on the connecting arm 57.
2. A driving connection means consisting of a belt or the like is connected so that the driving tread pressure roll 29 and the material conveying belt 5 are at the same speed.

To explain the operation operation, operate the lift handle 8 to raise and lower the first lift frame 7, adjust the first sanding material feed path gap 63 to match the thickness of the workpiece, and then operate the lift handle 15. The second lifting frame 14 is raised and lowered to adjust the second sanding material feed path gap 64 to match the thickness of the processed material.
Adjust. Incidentally, by raising and lowering the elevating frame 14, the drive tread pressure roll 29 is also raised and lowered in the same way as shown in FIGS. 3 and 4, with FIG. 3 showing the raised state and FIG. 4 showing the lowered state. The state in which the movement from FIG. 3 to FIG. As the elevating frame 14 including the roll 29 and the like descends, the intermediate gear 47 rotates around the gear 51 while meshing with the gear 51 and descends according to the amount of descent, and the rotating arm 41 and the connecting arm 57 This relationship results in a dogleg shape contraction around the intermediate gear shaft 44.
Conversely, when moving from FIG. 4 to FIG. 3, the intermediate gear 47
rotates around the gear 51 and rises while meshing with the gear 51, and the rotating arm 41 and the connecting arm 5
The relationship 7 is in a state of expansion.

Next, by inserting the workpiece, the workpiece is pressed by the treading rolls 13a and 13b, and the first
Sanding is performed and the material is fed, and a second sanding is performed while being pressed by the tread pressure rolls 20a and 20b, and the tip of the workpiece reaches the drive tread pressure roll 29 and pushes up the drive tread pressure roll 29 to release the ammunition 34, 34. The material is compressed and the material is further treaded by the compression, and the material is sent out in a stable and slip-free state.
Even if the treading force by 3a, 13b, 20a, 20b becomes weak or the workpiece tries to slip due to the running force of the sanding belt, the drive treading pressure roll 29 prevents it from flying out.
Even if the tip of the workpiece does not reach the treading roll 29 and slips, it is treaded at the position of the driving treading roll 29 and can overcome the driving force of the driving treading roll 29. The material feeding speed is corrected to the appropriate material speed. In addition, unlike in the past, the rear end of the workpiece passes through the tread pressure roll 20a and can only receive the treading action of the tread pressure roll 20b, and the running force of the sanding belt becomes stronger than the tread force of the tread pressure roll 20b, causing the workpiece to Even if an attempt is made to make it fly out, it cannot overcome the treading force and driving force of the driving tread pressure roll 29, and the flying out is prevented.

<Effects of the invention> As clarified by the explanation of the above embodiments, in the present invention, when the elevating frame equipped with the sanding section, the drive tread pressure roll, etc. moves up and down, the intermediate gear changes gears depending on the amount of elevation. The drive of the material feeding motor is transmitted to the drive tread pressure roll while absorbing the amount of lift by moving around the material, so the drive can be connected without being affected by the lifting and lowering of the lifting frame, which prevents the material from slipping and flying out. The workpiece is corrected to the same speed as the material feeding speed at the position of the drive tread pressure roll to prevent it from flying out, and a bullet is connected to the drive tread pressure roll to prevent the workpiece from flying out. When are you so powerful? Furthermore, since the material feeding gap can be adjusted while keeping the drive tread pressure roll at the same speed as the material feeding speed, it has an excellent effect in that materials ranging from thin materials to thick materials such as pillar materials can be freely selected.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic side view of a belt sander equipped with the present invention, FIG. 2 is a rear view, and FIG. 3 is a material feeding drive shown in FIG. Fig. 4 is the same as Fig. 3, with the drive treading roll lowered; Fig. 5 is an enlarged partially cutaway view showing the connected state of the material feeding drive unit; Fig. 6; is an enlarged vertical cross-sectional view of the vicinity of the connecting gear in FIG. 5; 5... Material feeding belt, 11, 18... Sanding belt, 22, 23... Roll support member, 29
...Drive tread pressure roll, 33...Chain, 34,
35... ammunition, 41... rotating arm, 42... rotating arm holder, 44... intermediate gear shaft, 46... intermediate gear bearing, 47... intermediate gear, 49... driven flange,
51... Gear, 54... Drive flange, 57...
Connection arms, 58, 59...sliding surfaces, 62...chains, 63, 64...material feeding gaps.

Claims (1)

[Scope of Claim for Utility Model Registration] A sanding section is provided on the lifting frame, and the material is fed while pressing the processed material against the material feeding surface using freely rotating treading rolls placed before and after the sanding section via bullets. In addition, a feed roll set at the same speed as the material feeding speed is installed on the upper part of the material feeding surface, and the sanding section is an automatic down sanding system in which the processed material is sanded by a sanding belt that runs endlessly in a direction that follows the material feeding direction. In a conveying belt sander, a shaft 2 is connected to a tread roll frame 21 provided at the rear of the sanding section via bearings 25 and 26.
4 is rotatably provided, and a pair of left and right roll support members 22 and 23 are engaged with the shaft 24 to provide a driving tread pressure roll 29 rotatably.
and a drive pressure roll 29 are connected by a drive connection means such as a chain or a belt, and the roll support members 22 and 23 are further provided with bullets 34 and 35 engaged with the pressure roll frame 21, and the feed material is processed. The tread pressure roll 2 is driven by the pressure of
9 is made to float elastically around the shaft 24. On the other hand, the material feeding drive roll shaft 40 is provided with a fixed gear 51 and a rotary arm support 42 that is rotatable. Attachment: An intermediate gear bearing 46 is provided at the tip of the rotating arm 41, an intermediate gear shaft 44 having an intermediate gear 47 fixed thereto is rotatably fitted into the intermediate gear bearing 46, and the intermediate gear 47 is meshed with the gear 51. provided, the intermediate gear 4
7 rotates around the gear 51 while meshing with the gear 51, and the connecting arm 57 is installed in sliding contact with the intermediate gear bearing 46 and the bearing 25 provided on the tread pressure roll frame 21, and the intermediate gear bearing 46 and the bearing 25 are connected. The rotating arm 41 and the connecting arm 57 are connected to each other so that they can freely expand and contract in a dogleg shape around the intermediate gear shaft 44, and the chain 6 is connected to the idler roll 61.
2. The intermediate gear 4 is connected to the intermediate gear 4 by a driving connection means such as a belt.
The intermediate gear shaft 44 of No. 7 and the shaft 24 of the bearing 25 are connected, and when the elevating frame moves up and down, the intermediate gear 47 rotates around the gear 51 and absorbs the amount of elevation according to the amount of elevation. A work material flying-out prevention device for a belt sander machine, characterized in that the drive of a material drive roll shaft 40 is transmitted to a drive tread pressure roll 29.