JPH0438560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (Field of Industrial Application) The present invention relates to a cutting device used to cut, cut out, or partially cut out a flexible plastic film.

(Prior technology) Conventionally, the process of perforating or cutting out a part of a flexible plastic film has been carried out in conjunction with the process of making bags for supermarket take-out bags, document organizing bags, etc. There are also small circles, ellipses or ellipses into which four fingers can be inserted, and arc-shaped notches to form a handle in the bag.

Conventionally, when making small holes (5 mm or less in diameter) in a film, a punching tool consisting of a die 1 and a punch 2 is used (see Figure 14), and when the part to be cut is long, a serrated cutting blade 3 is used.
Using a pedestal 4 having a clearance groove 5 corresponding to the cutting edge 3, place the film F on the pedestal 4, hold the film F under tension, and insert the serrated cutting edge 3a. It is cut so as to pierce the film F (see Figures 15 and 16).
Alternatively, in a cutting blade having a curved edge in a single plane, the film F is placed on a flat hard or soft holder 4a, and the film F is placed on the holder 4a by the cutting blade 3a. It is pressed and cut.

Furthermore, as a prior art, as described in Japanese Unexamined Patent Publication No. 55-125996, a sheet to be processed is attached to the edge of an irregularly shaped cutting blade, and a pressure roller is brought into rolling contact with the sheet to be processed. The method and principle of cutting into the shape of a cutting blade are illustrated.

However, in the device using a die and a punch, which is the first known technology, the sharpness of the blade quickly deteriorates, maintenance by polishing the blade, and high accuracy requirements for positioning the upper and lower tools are required, especially when drilling a large number of holes at the same time. In the case of (loose-leaf, binder binding films, or film bags), it is necessary to particularly improve the external precision, which requires a great deal of time and money for the cost of the entire device, maintenance and management costs, and setup work.

The serrated cutting blade of the second known technique does not come into contact with anything other than the film strip F, which is the object to be cut.
The alignment accuracy between the cutting blade and the cradle does not need to be very high, but the cutting edge of the saw blade is not sharp at the valley 6, and the cutting line of the film becomes jagged, which not only looks bad, but also causes this problem when a load is applied. Stress is concentrated at the jagged portions, and the film is easily torn. Also, sharpening the saw blade requires advanced technology and skill.

In the third known technique, in which the film strip F on the holder is cut by a cutting blade having a long edge in a single plane, it is necessary to provide the long edge in a single plane with high precision. The edge separates from the cradle, making it impossible to cut the film in that area, and if the edge is pressed too hard, the edge will be crushed, and the cradle will be severely worn out (see Figures 17 and 18).

The prior art, JP-A No. 55-125996, discloses a conceptual technology of a pressure roller that presses the edge of an irregularly shaped cutting blade, but what kind of material is used specifically? Furthermore, there is no specific disclosure of how to support the pressure roller or how to feed the sheet to be processed.

When the applicant company made a prototype of the device using the technology described in this publication and tried it again, it was found that depending on the material of the pressure roller, it could not be cut at all, and theoretically the contact area between the edge and the pressure roller could not be cut. and
Since there is very little contact resistance, the pressure roller often does not roll completely, making stable cutting impossible.

(Problems to be Solved by the Invention) Therefore, the present invention provides an apparatus for cutting a film strip into the edge shape by bringing a pressing roller into rolling contact with an edge that is substantially in the same plane when cutting the film strip. , the contact pressure between the pressure roller and the edge is appropriate, the cutting quality is good, the rolling characteristics of the pressure roller are excellent, and the life of the pressure roller is long, making it possible to cut irregular shapes industrially and efficiently. The goal is to provide equipment to the market.

B. Structure of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention provides a machine frame equipped with a tool rest on which a cutting blade having an edge of an arbitrary planar shape is fixed in a substantially horizontal plane. In the apparatus, the pressing roller is attached to a tool post support member having a diameter of 100 mm, and the pressing roller is made of a hard metal and has a diameter of
The pressure roller has a diameter of 10 to 25 mm, and its both ends are conical. At each tip of the conical shape, the pressure roller is rotatably supported by its support member. It consists of an arm rod that is long in the axial direction of the roller, and this arm rod is supported at one end so as to be able to pivot or reciprocate on a moving member that is equipped to be movable back and forth and left and right with respect to the machine frame. A pressure roller is provided so as to be able to roll against the edge by turning or reciprocating the arm rod, and the machine frame near the tool post support member is provided with a pressure roller that is not in operation at any time. The flexible plastic film cutting device is characterized in that a film intermittent conveying device is provided for feeding the film strip along the edge of the cutting blade.

Further, in order to achieve the above object, the cutting device for flexible plastic film of the present invention may be characterized in that the tool rest support member is also provided so as to be movable back and forth and left and right with respect to the machine frame.

(Operation of the Invention) In the device of the present invention constructed as described above, a cutting blade having an edge of a desired shape is attached to the blade supporting member, and then the film band to be processed is transferred to the film intermittent conveying device. The film strip is attached to the edge by passing the film through the film.

Next, the moving member is adjusted to move relative to the machine frame so that the pressing roller contacts the cutting blade at an optimum position.

This device is operated to convey the film strip intermittently by a fixed size, and each time the device is stopped, the supporting member of the pressure roller rotates or reciprocates, so that the pressure roller transports the film strip through the film strip. When the pressing roller presses against the edge of the cutting blade and moves from one end of the edge to the other end, the pressing roller receives rotational torque due to contact resistance with the edge and the film band,
The pressure roller slides with respect to the pressure roller support member at its conical tip portions at both ends, and rolls in contact with the edges.

At this time, the film strip between the pressure roller and the edge is cut into an edge shape.

In the device according to claim 2,
In order to adjust the position to be processed by the edge back and forth and left and right with respect to the stop position of the transported film band, the cutting blade support member and the movable member are adjusted by moving back and forth and left and right with respect to the machine frame. do.

(Embodiments) This invention will now be described with reference to typical embodiments including the inventions of claims 1 and 2.

A tool rest 22 to which a cutting blade 20 having an edge 21 of an arbitrary planar shape is fixed in a substantially horizontal plane, a tool rest support member 23 to which the tool rest 22 is attached with the edge 21 facing downward, and the tool rest. The cutting blade 20 of the tool rest 22 supported by the support member 23
A device similar to a conventionally known device is used as the device provided with the pressure roller 40 that rolls into pressure contact with the edge 21 of the device.

There is no particular limitation on the planar shape of the edge 21 mentioned above, and the cutting edge 20 having the circular edge 21 may be discontinuous as shown in FIGS. 9 and 10 as well as the shapes shown in FIGS. 8a to 8e. For example, it can be used as a cutting edge for punching binding holes in loose leaf, or as the first cutting edge.
Cutting blades 20 of the present invention include those in which the edges 21 are discontinuous as shown in FIGS. 2 and 13.

In either case, all edges 21 are located approximately in the same plane. When the edge 21 is discontinuous, in order to prevent excessive collision with the pressure roller 40 at the end of the edge 21, a guide protrusion 26 is provided near the edge 21 and extends along the edge 21 in the rolling direction of the pressure roller 40. may be provided on the tool post 22. Among these tool rests 22 to which cutting blades 20 of arbitrary shapes are fixed, one to which a cutting blade 20 of a desired shape is fixed is selected and used.

In the embodiment, the pressure roller 40 is made of hard metal and has a diameter of 10 to 25 mm,
Both end portions 40a are conical, and the pressure roller 40 is rotatably supported by a support member 41 at each tip of the conical shape.

More specifically, as shown in FIG. 1, the pressure roller 4 is mounted in a conical depression-shaped pressure roller receiver 41a that is integrated with an arm rod 41 that is a pressure roller support member 41.
0 is rotatably supported.

A film intermittent transport device 90 is provided near the tool post support member 23 for supplying a film strip along the cutting blade 20 during times when the pressing roller 40 is not in operation. Normally, it also serves as an intermittent film transport device for a bag making machine (see Figure 2).

That is, a pair of upper and lower sandwich type conveyors (including a pair of rollers) 91 are provided at the downstream side of the tool post support member 23, and several guide rollers 92, 93 provided at the upstream and downstream positions of the tool post support member 23. Thus, the film intermittent conveying device 90 is constructed.

As shown in FIGS. 5 and 6, the above-mentioned tool post support member 23 is movable in the machine frame 70 in the width direction and in the upstream and downstream directions of the film strip F that is transported by the film intermittent transport device 90. It is provided.

That is, a guide member 24 extending in the width direction of the film belt F is fixed to a movable frame 60 that is movable in the transport direction of the film belt F with respect to the machine frame 70. The turret support member 23 is slidably mounted, and the upper feed screw rod 25 is mounted on the moving frame 60 in parallel with the guide member 24 and the turret support member 23
A part of the tool rest support member 2 is screwed together, and the rotation of the upper feed screw rod 25 about the axis causes the tool post support member 2 to
3 moves in the width direction of the film band F while being guided by the guide member 24, and its position can be changed in the upstream and downstream directions by moving the moving frame 60 in the upstream and downstream directions.

Reference numeral 42 denotes a lower movable table, and the movable frame 60 is equipped with a lower guide member 43 parallel to the guide member 24 and a lower feed screw rod 44. The lower threaded rod 44 is rotated around its axis to move the lower moving table 42 in the width direction of the film band F. It is provided so that it can move in the upstream and downstream directions as the table 60 moves.

This lower moving table 42 has a vertical drive rotation shaft 45.
is equipped with an arm rod 41 which is a pressing roller support member 41 that supports the pressing roller 40.
One end is fixed. The free end 4 of this arm rod 41
The pressing roller 40 is installed at the portion near 6.

In the example shown in FIG. 6, the base of the arm rod 41 is provided so as to be able to change its angle up and down with respect to the vertical rotation axis 45, and a pressing spring 50 is installed between the arm rod and a parallel sub arm rod 49. The arm rod 41 is equipped so that its pressing force can be adjusted with an adjusting screw 51.
It is provided so that it is pushed up slightly.

A pinion 61 having an axis parallel to the direction of the guide members 24 and 43 is rotatably provided on the movable frame 60, and a rack 71 with which this pinion 61 meshes is horizontally fixed to the machine frame 70. By rotating the handle 62 that is integrated with the pinion 61, the tool can be moved in the direction of the rack 71, that is, in the direction of transporting the film belt F, and as a result, the upper tool rest support member 23 and the lower moving stage 42 can be moved. It is mounted on the machine frame 70 so as to be movable back and forth in the conveying direction of the film belt F.

In the above-mentioned example, the tool post support member 23 and the lower movable table 42 are separate members, but they may be an integrated member.

As a transmission mechanism for rotating the rotating shaft 45, 1
A vertical fixed shaft 73 that rotates at a ratio of 1:1 to a main shaft 72 that rotates once per cycle is connected to the rotating shaft 45 by two links 75 and 76 with an intermediate shaft 74 as a joint. The rotating shaft 45 and the intermediate shaft 74 are provided with sprocket gears 77 and 78 having the same number of teeth.
are fixed to each other, and an endless chain 79 is meshed with these, and the intermediate shaft 74 and the position fixed shaft 73 are engaged with each other.
Both have sprocket gears 8 with the same number of teeth.
0 and 81 are fixed to each other, and an endless chain 82 is meshed with these, and one rotation of the main shaft 72 moves the arm rod 41 and the pressing roller 40 to the rotating shaft 45.
Rotate around once.

The timing between the operation of the film intermittent conveyance device 90 and the rotation shaft 45 is such that the pressing roller 40 moves to the cutting edge 2 while the film intermittent conveyance device 90 is stopped.
It is linked so that it touches 0.

Effects of the Embodiment As shown in FIGS. 2, 5, and 6, first, a tool rest 2 is equipped with a cutting blade 20 shaped according to the purpose.
2 is fixed to the tool post support member 23 in a position that matches the purpose so that the edge 21 faces downward, and then the film strip F to be processed is passed through the guide rollers 93, 92 and the intermittent conveyance device 90, and then The moving frame 60, the tool post support member 23, and the lower moving table 43 are moved to align the cutting blade 20 with the target processing position.

Next, the pressing force of the pressing spring 50 that presses the arm rod 41 is optimized by the adjusting screw 51 according to the material, thickness, and number of layers of the film band F.

When this device is operated, the film belt F is sequentially transported by a predetermined length by the film intermittent transport device 90, and the arm rod 41 is
Then, the pressing roller 40 rotates around the rotating shaft 45, and the pressing roller 40 rolls into pressure contact with the edge 21 of the cutting blade 20 from the lower side of the film strip F, cutting the film strip into the shape of the edge 21. do.

C. Effects of the Invention Since this invention is constructed and operates as described above,
The film strip can be fed along the edge at intervals to be processed, and each time the film strip is stopped, the pressing roller is brought into rolling contact with the edge that is substantially in the same plane, and the film strip is shaped into the edge shape. disconnect.

In particular, since the diameter of the pressure roller is as described above,
The contact pressure between the pressure roller and the edge is appropriate, and the cutting edge is good, and since the pressure roller has a conical shape at both ends and is supported by its tip, the contact resistance is extremely small, and its rolling characteristics are excellent. The pressure roller rolls easily and reliably even with slight contact pressure between the film strip and the edge.

Furthermore, since the material of the pressing roller is as described above, it has a long life and can be cut into irregular shapes industrially and efficiently.

In addition, if the pressing force of the pressing roller is increased by 10 to 50% of the limit that can cut the film strip, the cutting life can be maintained for about 1 to 6 months. . Of course, this value depends on the materials of the pressure roller and cutting blade, but if both are made of high-speed hardened steel, it will fall within this range.

Furthermore, the film band is not limited to a single film; it is also possible to cut a stack of two or four films, and it is also possible to cut flexible thin films of 20 μm or less, which was previously difficult.

Further, since the support member of the pressure roller is connected to the vertical rotation drive shaft at one end thereof, the movement of the pressure roller is rotational or reciprocating rotational movement, and the movement is smooth.

In addition, in the device according to claim 2, since the tool rest support member and the pressure roller support member can also be moved horizontally back and forth and left and right, their positions can be optimally adjusted relative to the stop position of the film band. Can be adjusted to position.

Furthermore, the apparatus of the present invention can be incorporated into a part of a conventional bag making machine.

(Effects unique to the embodiment) The device of the embodiment has the same effects as the device of the patented invention described above, of course.
Furthermore, the following effects are achieved.

In the embodiment described above, since the tool post support member 23 and the lower movable table 43 can be moved along the film band F to any desired position in the transport direction and the width direction, the position of the cutting blade 20 can be adjusted to the desired position. can be set accurately. Further, since the vertical rotation shaft 45 of the arm rod 41 is connected to the drive shaft 73 by the transmission means as described above, the turret support device 23 and the lower movable table 42 can be operated regardless of their positions. Rotating shaft 45
It can be rotated around or reciprocated.

[Brief explanation of drawings]

The drawings show things related to this invention, in which Fig. 1 is a mechanical front view showing the principle mechanism of this invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a reciprocating rotation. A plan view of the dynamic pressure roller, FIG. 4 is a partially cutaway plan view of the entire device, FIG. 5 is a longitudinal sectional front view of FIG. 4, and FIG. 6 is a, b, c, d, and e are cutting edges. FIG. 7 is a vertical side view showing an example of the cutting blade, FIG. 8 is a plan view of FIG. 7, and FIG. 9 is a vertical front view taken along line A-A in FIG. 8. Fig. 10 is a vertical side view showing another embodiment of the cutting blade, Fig. 11 is a plan view of Fig. 10, and Figs. 15 is a side view of a push-cut type device, FIG. 16 is a front view of FIG. 15, and FIG. 17 is a longitudinal sectional side view of a cutting device having an elastic cradle during cutting. Main symbols in the figure: 20...cutting blade, 21...edge, 22...turret, 23...turret support member,
40...Press roller, 41...Press roller support member (= arm rod), 41a...Press roller holder, 45...
...Rotation axis, 60...Moving frame, 70...Machine frame, 90
...Intermittent film transport device.

Claims (1)

[Scope of Claims] 1. A tool rest on which a cutting blade having an edge of an arbitrary planar shape is fixed in a substantially horizontal plane is attached to a tool rest support member installed in a machine frame, and the edge of the cutting blade In a device equipped with a pressure roller that rolls in pressure contact with the pressure roller, the pressure roller is made of hard metal and has a diameter of
The pressure roller has a diameter of 10 to 25 mm, and its both ends are conical. At each tip of the conical shape, the pressure roller is rotatably supported by its support member. It consists of an arm rod that is long in the axial direction of the roller, and this arm rod is supported at one end so as to be able to pivot or reciprocate on a moving member that is equipped to be movable back and forth and left and right with respect to the machine frame. A pressure roller is provided so as to be able to roll against the edge by turning or reciprocating the arm rod, and the machine frame near the tool post support member is provided with a pressure roller that is not in operation when the pressure roller is in operation. A cutting device for flexible plastic film, characterized in that a film intermittent conveying device is provided for feeding the film strip along the edge of the cutting blade. 2. The flexible plastic film cutting device as set forth in claim 1, wherein the tool rest support member is also movable back and forth, left and right with respect to the machine frame.