JPH058083Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved rotary clipper mainly used for cutting veneer veneers (hereinafter simply referred to as veneers).

A conventional rotary clipper is equipped with a rotary blade having a rotating shaft, and an anvil roll as a blade receiver whose outer periphery is coated with an elastic material such as various types of rubber to protect the cutting edge of the rotary blade. The rotary blade and the anvil roll are each driven continuously or intermittently, but strictly synchronized rotation of the two members is virtually impossible, and an elastic body coated on the outer periphery of the anvil roll is used. Since it is easy to damage, it has the disadvantage that maintenance and management costs required to maintain proper cutting conditions are enormous.

That is, as mentioned above, when the outer periphery of the anvil roll is coated with an elastic body, the elastic body is compressively deformed during the cutting operation of the rotary blade, so in order to cope with the compressive deformation,
It is necessary to arrange the cutting blade so that it cuts into the elastic body to some extent at the position closest to the anvil roll to ensure proper cutting. The set circumferential speeds of the two members are basically different, as in the case where the roll is always driven at a constant circumferential speed and the circumferential speed of the rotary blade is changed in accordance with the desired veneer cutting length. In this case, it is natural that the elastic body is significantly damaged each time the cutting blade bites due to the speed difference.

For example, "Rotary Clipper" (JP-A-Sho)
58-208004)・"Rotary Clipper"
(Utility Model Application Publication No. 58-181506) or the present applicant
As in the technology disclosed in "Rotary Clipper" (Japanese Unexamined Patent Application Publication No. 2-60707) filed on August 27, 1963, the anvil roll is substantially twisted in the following manner with respect to the rotary blade. Even when attempting to reduce the cutting resistance, the circumferential speed of the member on either side is substantially different in each local area in the axial direction of the member, making it difficult to specify the reference circumferential speed. Since it is extremely difficult, it is difficult to avoid the occurrence of speed differences, and damage to the elastic body is relatively common.

Furthermore, even if the circumferential speeds of the rotary blade and anvil roll are macroscopically the same, the compressive deformation state of the elastic body before cutting, during cutting, just before cutting is completed, during cutting, or immediately after cutting, etc. As a result, the circumferential speed of the anvil roll's local area increases and decreases microscopically, making it virtually impossible to rotate both members in exact synchronization. Therefore, it is difficult to avoid excessive damage to the elastic body due to the speed difference between the two members, and if the elastic body is damaged and the anvil roll becomes smaller in diameter, the speed difference will further increase, resulting in further damage. In order to maintain proper cutting conditions at all times, it is necessary to frequently update the elastic body, resulting in huge maintenance and management costs.

On the other hand, we have already developed an ``anvil roll drive device for a veneer veneer roll clipper''
14553), an overrunning clutch is interposed in the anvil roll, and the overrunning clutch absorbs the speed difference. In addition to buffering the impact caused by the speed difference, the overrunning clutch absorbs the speed difference. Improved techniques have been proposed to try to prevent damage.

However, the overrunning clutch works effectively only when the circumferential speed of the rotary blade is faster than the circumferential speed of the anvil roll, and it does not work effectively in the opposite case. Although it is effective in buffering the impact when the speed is set higher than the circumferential speed of the anvil roll, it is not effective in dealing with increases or decreases in the local speed of the anvil roll due to changes in the compressive deformation state of the elastic body, for example. Therefore, it is not very effective in preventing excessive damage to the elastic body.

And, most fatally, when the overrunning clutch operates, the circumferential speed of the anvil roll becomes faster than the set speed, not only when the rotating blade is driven, but also until the rotational inertia of the anvil roll disappears. , since it imparts conveying force to the veneer,
For example, it is easy to cause problems such as wrinkles on the rear end of the cut veneer, or the cut length of the next cut veneer becomes longer than desired, and this is a serious problem as an improved technique. It was sufficient.

The present invention was developed in view of the above-mentioned circumstances, with the aim of significantly reducing excessive damage to the elastic body by using a rational configuration that does not cause the above-mentioned inconveniences. This mechanism is characterized in that a torque limiter is interposed within the mechanism, and the anvil roll is driven through the torque limiter.

According to the above configuration, the anvil roll in normal state is driven at a predetermined circumferential speed via the torque limiter, and when a speed difference occurs with respect to the rotary blade as the rotary blade approaches, The torque limiter interposed in the drive mechanism slips and rotates in response to speed increase or deceleration, accurately following the circumferential speed of the rotary blade, resulting in the rotation of the rotary blade and anvil roll. It is difficult for a speed difference to occur between the two members as in the conventional case, and excessive damage to the elastic body due to the speed difference between the two members is greatly reduced.

Of course, once the situation where the speed difference occurs is resolved and the torque limiter no longer slips, the anvil roll will immediately be driven at the predetermined circumferential speed, so there is a risk that the problems described above in the known improvement description may occur. This is extremely useful as an improved technology for this type of rotary clipper.

In the following, the invention will be further described along with an example of implementation illustrated in the drawings.

FIG. 1 is a partial front view of a rotary clipper according to the present invention.

In the figure, reference numeral 1 denotes a drive source, which consists of various fixed-speed or variable-speed electric motors, or electromagnetic or pneumatic clutch brakes connected to various electric motors, and a driving gear 2 and a driven gear 3. , 4 etc.,
An anvil roll 5 and a rotary blade 6, which will be described later, are driven continuously or intermittently in the direction of the arrow in the figure at a desired circumferential speed.

Reference numeral 5 denotes an anvil roll, the outer periphery of which is covered with an elastic body 5a such as various types of rubber, and rotatably supported via a bearing 9a attached to the machine frame 10 (the other side is not shown).

Reference numeral 6 denotes a rotary blade, which is fixed to a roll-shaped clipper beam 7 by appropriate means, and the clipper beam 7 is attached to a bearing 9 attached to the machine frame 10.
b (the other side is not shown).

Reference numeral 8 denotes a torque limiter, which is composed of a hub 8a, a plate 8b, a friction plate 8c, a disc spring 8d, an adjustment nut 8e, etc., and transmits the driving force of the driven gear 4 to the anvil roll 5. If an excessive load is applied, the friction plate 8c will slip.

The rotary clipper according to the present invention is constructed, for example, as shown in FIG. 1, in which an anvil roll 5 and a rotary blade 6 are driven by a drive source 1.
When the rotary blade 6 approaches the anvil roll 5 until it comes into contact with it, the veneer (not shown) being carried in is cut.

At this time, the anvil roll 5 in the normal state is driven at a predetermined circumferential speed via the torque limiter 8, but as the rotary blade 6 approaches, a speed difference occurs with respect to the rotary blade 6. The torque limiter 8 slips and rotates according to the circumferential speed of the rotary blade 6 in response to either speed increase or deceleration, resulting in a gap between the rotary blade 6 and the anvil roll 5. It is difficult for the speed difference to occur as in the conventional case, and excessive damage to the elastic body caused by the speed difference between the two members is greatly reduced.

Of course, once the speed difference is resolved and the torque limiter no longer slips, the anvil roll will immediately be driven at the predetermined circumferential speed, so there will be no wrinkles on the rear end of the cut veneer. This type of rotary machine, including the type that reduces the cutting resistance mentioned above, does not cause any inconvenience such as the length of the veneer to be cut next being longer than desired. This is an extremely useful technique for improving clippers.

Incidentally, the shape of the torque limiter is not limited to the shape of the above embodiment, and the point is that the torque limiter is within the drive mechanism of the anvil roll, and is usually capable of driving the anvil roll at a desired circumferential speed, and is suitable for the anvil roll. It is sufficient that the anvil roll slips only when a load exceeding a predetermined limit is applied, and the permissible load is preferably set to such an extent that the anvil roll hardly rotates excessively due to rotational inertia.

Further, in the above embodiment, the rotary blade and the anvil roll were configured to be driven synchronously by a single drive source, but if necessary, they may be driven separately by multiple drive sources. If configured in this way, it is possible to adopt a configuration in which, for example, the anvil roll is driven continuously and the rotary blade is driven intermittently, or the speed can be changed only on the side of the desired member. A mechanism or a variable speed drive source may be provided to change the circumferential speed of only desired members.

Furthermore, the rotary blades of this type of rotary clipper include disposable ultra-thin blades in addition to re-sharpened thin blades that are replaceably provided on the clipper beam, but in any case, the number of blades is The shape of the clipper beam is not limited to one as in the embodiment, but may be multiple if necessary.Of course, the shape of the clipper beam is not limited to the roll shape as in the above embodiment, but may also be in the shape of a plate or triangular prism, for example. You can change the settings as appropriate.

Of course, the rotary clipper according to the present invention can be used to cut a desired portion of a sheet or plate made of plastic board, paper, leather, etc., while continuously or intermittently conveying it. It is possible to do this, and the object is not limited to veneers, but the economic effect of prolonging the renewal of elastic bodies is extremely beneficial to any field.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a partial front explanatory view of a rotary clipper according to the present invention. 1... Drive source, 5... Anvil roll, 6...
Rotating blade, 7... Clipper beam, 8... Torque limiter.

Claims (1)

[Scope of utility model registration request] In a rotary clipper having a rotary blade having a rotating shaft and an anvil roll as a blade receiver, a torque limiter is interposed in the drive mechanism of the anvil roll, and the anvil roll is driven through the torque limiter. A rotary clipper with the following features.