JP2021137929A - Circular Thomson blade fixing method and fixing structure - Google Patents

Abstract

To provide a fixing member for firmly holding a Thomson blade.SOLUTION: A Thomson blade attachment hole and a Thomson blade fixing member insertion hole are integrally formed (a shape obtained by connecting a substantial rectangle and a circular arc in a plan view), one surface of one component formed by diving substantially rectangular parallelepiped into two is determined to be a Thomson blade contact surface, the surface of the other component is determined to be a fixing member insertion hole contact surface, and a normal and inverse tapered surfaces of each component are relatively arranged and pressure-inserted into the fixing member insertion hole. Also, the length of a contact part between the fixing member and a circular Thomson blade is from 5% to 15% of the circumference of the circular Thomson blade in a plan view.SELECTED DRAWING: Figure 7

Description

The present invention relates to a circular Thomson blade fixing method and a circular Thomson blade fixing member used in an automatic punching machine for cutting a thin plate-shaped material such as paper or cardboard into a predetermined shape with a punching die and punching.

In the manufacturing process of paper, corrugated cardboard, etc., the Thomson type is used when punching a blank of a predetermined shape from a thin plate-like material as a raw material. A general Thomson blade is formed by bending a strip-shaped blade into a predetermined shape, and is press-fitted into a groove formed in a veneer plate or the like as a base to stand and fix it. This groove is formed by laser machining, but is often a hole that tapers upward.

However, if the cutting work is repeated, the Thomson blade may come off, tilt, or misalign, and accurate cutting cannot be performed. Therefore, a method of fixing the Thomson blade to the base with an adhesive or a screw was used, but there were problems such as the Thomson blade being damaged by the load at the time of removal and not being reusable due to the time and effort required for attachment and detachment and position correction. ..

Therefore, there is an invention of a fixing member for a Thomson blade developed by the applicant in order to easily and surely prevent the Thomson blade from coming off or tilting (Patent Document 1).

Further, as a cutting die having a structure capable of collecting cut pieces and not causing deviation, there is an invention of a punching die having a loop-shaped cutting edge integrated with a pedestal (Patent Document 2).

On the other hand, in the Thomson blade, the product and the debris are connected in a well-balanced manner, and a part of the debris is not cut to prevent troubles due to disintegration, and a part of the cutting edge of the Thomson blade is not completely separated from the molded sheet. There is a process called nick (connecting) to crush.

Cylindrical and cylindrical Thomson blades that have undergone this nick processing, and circular Thomson blades that have a circular band-shaped blade form not only prevent the Thomson blade itself from coming off and misalignment, but also prevent misalignment at the nick processing site. That is, it is necessary to prevent the rotation of the Thomson blade itself.

A method conventionally used as a rotation prevention measure for the nicked cylindrical Thomson blade will be described with reference to FIG.

A notch 4 is provided at the base end of the cylindrical Thomson blade 1 which is nicked by providing several recesses 2 on the peripheral edge of the cutting edge 3 of the cylindrical Thomson blade 1. The cylindrical Thomson blade 1 is erected and held in the Thomson blade mounting hole of the base veneer plate 5, and the lock member 6 is press-fitted into the notch 4 from the back surface of the veneer plate 5 to fix the cylindrical Thomson blade 1 to the veneer plate 5. , Prevents rotation.

JP-A-2019-177466 JP-A-2007-83395

It was difficult to fix the circular Thomson blade, and it sometimes rotated on the spot even if it did not shift or tilt. In particular, if the circular Thomson blade that has been nicked rotates and the joining location of the product deviates from the predetermined position, the product value will be significantly reduced, so it is necessary to reliably prevent the rotation.

The conventional method as a measure to prevent rotation of the circular Thomson blade is a step of making a notch in the base end of the circular Thomson blade and a step of press-fitting a lock member into the notch to fix the veneer plate and the circular Thomson blade. It was technically difficult, and it took time and effort.

On the other hand, the fixing member 8 of the circular Thomson blade 7 described in Patent Document 1 is integrally formed of two constituent members 9 and 10 (FIGS. 3 and 4) obtained by dividing a substantially rectangular parallelepiped having elasticity into two diagonally in the vertical direction. The circular Thomson blade 7 and the fixing member 8 are press-fitted into the Thomson blade mounting portion and the Thomson blade fixing member insertion hole to be pressed and fixed.

Explaining the mounting method in detail, one side surface 10a of one component member 10 formed by dividing the component member 8 made of a substantially rectangular parallelepiped into two diagonally in the vertical direction is cut into an arc shape in advance according to the side surface shape of the circular Thomson blade 6. The missing and formed contact surface with the circular Thomson blade 7, one surface of the other component 9 is used as the contact surface for the fixing member insertion hole, and the slopes 9a and 10b of the component are arranged relative to each other so as to be opposite tapered surfaces. Then, it is press-fitted into the fixing member insertion hole.

By forming the contact surface 10a of the constituent member 10 into an arc shape that matches the side surface shape of the circular Thomson blade 7, the contact area is increased, and even the circular Thomson blade is firmly pressed and fixed.

This method is effective for fixing the circular Thomson blade, but is insufficient for completely preventing the rotation of the circular Thomson blade. That is, although it is effective in preventing misalignment and tilting, it may not be possible to completely prevent rotation on the spot. In addition, there is a trouble that one surface of one of the constituent members of the fixing member must be shaved in an arc shape in advance. It is difficult to suppress the rotation of the circular Thomson blade unless the arcuate recess is formed accurately enough to be in close contact with the circular Thomson blade.

Further, the invention described in Patent Document 2 is one in which a loop-shaped blade and a pedestal are integrally formed, and it seems that rotation of the loop-shaped blade can be prevented as much as possible, but the price is very high. It is not realistic to install a large number of them in one die because of high cost.

Therefore, the present application provides a simple circular Thomson blade fixing method and fixing member capable of more firmly pressing and fixing the circular Thomson blade and further preventing rotation.

In order to solve the above problems, in the present application, the circular Thomson blade mounting portion and the fixing member mounting portion are communicated with each other, and the circular Thomson blade inserted and arranged in the circular Thomson blade mounting portion is press-fitted into the fixing member mounting portion. It is pressed and fixed with the fixed member. At this time, the circular Thomson blade mounting portion and the fixing member insertion portion formed in communication with each other are formed in a shape in which a substantially rectangular shape and an arc are joined in a plan view.

The fixing member is characterized in that it is composed of two constituent members, which are formed by dividing a substantially rectangular body having elasticity into two diagonally in the vertical direction.

Further, the length of the contact portion between the fixing member and the circular Thomson blade is set to 5% to 15% of the circumference of the circular Thomson blade in a plan view.

The fixing member that presses and fixes the circular Thomson blade is an elastic member such as wood. On the other hand, since the Thomson blade is made of iron-based metal and is rigid, the contact surface of the fixing member pressed against the circular Thomson blade compresses and changes its shape according to the side surface of the circular Thomson blade, making it stronger. Fix the circular Thomson blade. Therefore, not only the displacement of the Thomson blade but also the rotation of the Thomson blade itself can be prevented, which contributes to the improvement of the processing accuracy of the product.

Since the fixing member is formed by dividing a substantially rectangular parallelepiped into two diagonally in the vertical direction, when the opposite tapered surfaces are butted against each other and press-fitted into the fixing member insertion portion, the circular Thomson blade is firmly pressed like a wedge.

In particular, the rotation of the nick-processed circular Thomson blade can be easily and surely prevented, and the occurrence of defective products due to misalignment of a predetermined joining location can be suppressed as much as possible.

The number of steps is smaller than the conventional method in which a notch is made in the base end of the circular Thomson blade, a lock member is press-fitted into the notch, and the base and the circular Thomson blade are fixed to prevent rotation. Effort is greatly reduced.

Even if most of the side surface of the circular Thomson blade is not pressed as in the conventional case, the effect of preventing rotation can be obtained only by contacting and pressing a part of the blade.

A perspective view of a cylindrical Thomson blade with a nicked cutting edge. Explanatory drawing which shows the state which fixed the nick processed cylindrical Thomson blade to the base. A plan view showing a state in which a conventional circular Thomson blade is fixed by a fixing member composed of two constituent members. Same as above, front view. Explanatory drawing which shows the state which fixed the cylindrical Thomson blade by the fixing method which concerns on this invention. The same is an explanatory view showing the state seen from the side. The plan view which shows the state which the fixing member and the Thomson blade are attached to the fixing member insertion part and the circular Thomson blade attachment part provided on the plywood. a Front view of a circular Thomson blade fixing member.

b Front view showing a state in which the circular Thomson blade is pressed by the circular Thomson blade fixing member.
The same is an explanatory view showing the installation procedure.

It is cut out by laser processing so that the fixing member insertion portion 11 and the circular Thomson blade attachment portion 12 communicate with each other on the veneer plate which is the base on which the Thomson blade is attached. FIG. 5 is a plan view showing the state at this time. The circular Thomson blade used here is a cylindrical Thomson blade having a circular cutting edge.

On the other hand, the insertion / attachment portion of the cylindrical Thomson blade does not necessarily have to be an insertion hole, and may be an insertion groove. As shown in FIG. 6, the cylindrical Thomson blade insertion groove 13 and the fixing member insertion portion 14 communicate with each other. All you need is.

The fixing member is made of wood, hard rubber, synthetic resin, etc., and has elasticity and is more flexible than the material of the Thomson blade. That is, it is necessary to use a material whose shape changes according to the shape of the Thomson blade when pressed against the Thomson blade with a constant force. However, since it is sufficient to have these properties, it is not particularly limited to the above materials, but a wood material is preferable in consideration of ease of processing and low cost.

FIG. 7 is a plan view showing a state in which the cylindrical Thomson blade 15 is pressed by the fixing member 16, and FIG. 8 is a front view thereof.

A cylindrical Thomson blade insertion groove 17 for press-fitting the cylindrical Thomson blade 15 is provided by laser processing on the veneer plate serving as a base, and a fixing member insertion portion 18 for inserting the fixing member 16 is communicated with the cylindrical Thomson blade insertion groove 17. And provide.

Since the fixing member is press-fitted into the fixing member insertion portion to fix the cylindrical Thomson blade, the cross-sectional width W2 of the fixing member insertion portion 18 is set to be slightly smaller than the cross-sectional width W1 of the fixing member 16. ..

The fixing member 16 is composed of constituent members 19 and 20 formed by dividing a substantially rectangular parallelepiped into two diagonally in the vertical direction. The cylindrical Thomson blade 15 is inserted into the cylindrical Thomson blade insertion groove 17 to be in an upright holding state, and the surface 19b facing the slope 19a of one component 19 is arranged along the inside of the fixing member insertion portion 18. Subsequently, when the slope 20a of the other constituent member 20 is aligned with the slope 19a of the constituent member 19, that is, the tapered surfaces of the respective constituent members are brought into contact with each other in the forward and reverse states, and the slope 20a is driven by a hammer or the like ( FIG. 9), the facing surface 20b of the slope 20a of the elastic constituent member 20 is pressed by the cylindrical Thomson blade 15 and is in a state of being pressed against the cylindrical Thomson blade 15 while being curved and compressed.

At this time, the outer edge length of the cylindrical Thomson blade in contact with the constituent member 20 of the fixing member is 5% to 15% of the circumferential length of the cylindrical Thomson blade in a plan view. That is, the area of the cylindrical Thomson blade in contact with the component 20 is 5% to 15% of the side area of the cylindrical Thomson blade.

Since the cylindrical Thomson blade is firmly fixed, it is possible not only to prevent misalignment and disconnection, but also to effectively prevent the rotation of the cylindrical Thomson blade itself on the spot.

The present invention can be used as a method for fixing a circular Thomson blade. In particular, it can be most preferably used to prevent rotation of a circular Thomson blade that has been nicked.

15, Cylindrical Thomson blade 17, Cylindrical Thomson blade insertion groove 16, Cylindrical Thomson blade fixing member 19, 20, Cylindrical Thomson blade fixing member component 18, Cylindrical Thomson blade fixing member insertion part

Claims (5)

It has a fixed structure with a circular Thomson blade.
The circular Thomson blade mounting portion and the circular Thomson blade fixing member mounting portion are formed in communication with each other in a shape in which a substantially rectangular shape and an arc are joined in a plan view.
The outer edge of the circular Thomson blade is pressed against the circular Thomson blade inserted into the circular Thomson blade mounting portion and the elastic circular Thomson blade fixing member inserted into the circular Thomson blade fixing member mounting portion.
Fixed structure of circular Thomson blade. The fixing structure for a circular Thomson blade according to claim 1, wherein the circular Thomson blade fixing member comprises two constituent members obtained by dividing a substantially rectangular parallelepiped into two diagonally in the vertical direction. The fixing structure for a circular Thomson blade according to claim 1 or 2, wherein the outer edge length of the circular Thomson blade with which the circular Thomson blade fixing member contacts is 5% to 15% of the circumference of the circular Thomson blade. The circular Thomson blade mounting portion and the circular Thomson blade fixing member mounting portion are formed to communicate with each other in a shape in which a substantially rectangular shape and an arc are joined in a plan view.
Place the circular Thomson blade on the circular Thomson blade mounting part,
Press-fitting an elastic, substantially rectangular parallelepiped circular Thomson blade fixing member with a width slightly larger than the cross-sectional width of the circular Thomson blade fixing member mounting portion into the circular Thomson blade fixing member mounting portion to press and fix the circular Thomson blade. A characteristic circular Thomson blade fixing method. The circular Thomson blade fixing member is composed of components that are diagonally divided into two in the vertical direction.
One component whose cross-sectional width increases toward the insertion side is inserted and held in the circular Thomson blade fixing member mounting portion.
Other components whose cross-sectional width becomes smaller toward the insertion side are press-fitted into the fixing member mounting portion by arranging the opposite tapered surfaces of each component relative to each other.
The method for fixing a circular Thomson blade according to claim 4, wherein the circular Thomson blade is pressed and fixed.

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