JPH0617895U - Curve cutting device for manufacturing synthetic resin film bags - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention provides a curve cutting device capable of quickly and reliably and efficiently bending and cutting an object A made of a synthetic resin film. [Structure] A transverse feed mechanism 2 of a required length disposed below the long-cylindrical synthetic resin film to-be-cut object A to be orthogonal to the transport direction, and orthogonal to the transverse feed mechanism 2. The vertical feed mechanism 4 mounted on the vertical feed mechanism 4, the rotary holder 5 for the cutter installed upright on the vertical feed mechanism 4, and the rotary holder 5 for the cutter in order to always hold the cutter 7 in the cutting direction. It is composed of a cam mechanism 8.10 for rotation control, and while the rotation of the cutter rotation holder 5 is controlled by the cam mechanism 8.10, the vertical feed mechanism 4 appropriately feeds vertically and the lateral feed mechanism 2 feeds laterally. Then, the cutter 7 is always bent and run in a substantially W shape in the cutting direction, and the object A to be cut is bent and cut.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a curve cutting device used for manufacturing a relatively large bag made of a synthetic resin film such as a so-called garbage bag.

[0002]

[Prior art]

 Conventionally, as a bag made of synthetic resin such as a dust bag 51, a bag body 52 in which a mouth portion 53 of a bag body 52 is formed into a substantially W-shape is known as shown in FIG. The mouth portions 53 can be easily bound by binding the protruding pieces 54 to each other.

By the way, as a device for bending and cutting the mouth portion 53 of the dust bag 51 into a substantially W shape, a curve cutting device disclosed by the present inventors (Japanese Patent Application No. 2-75985) is known. This will be described with reference to FIGS. 4 and 5. That is, in the figure, reference numeral 55 designates a pair of upper and lower feed rollers arranged at a predetermined interval so as to intermittently horizontally transfer the synthetic resin film-shaped workpiece A in the form of a long cylinder, and a pair of feed rollers 56. A welder 57 disposed at the transfer level of the object A to be moved up and down in conjunction with the feed roller 55 is disposed in front of the welder 56 so as to be orthogonal to the transfer direction of the object A. The straight line cutting device 57 has a structure in which a required cutter 59 is erected and held in an endless drive chain 58. Reference numeral 60 denotes a curve cutting device horizontally arranged in front of the straight line cutting device 57. The curve cutting device 60 is attached to an endless drive chain 61 whose forward side is bent in a substantially W shape. The cutter 62 is attached so as to be able to stand upright via the ment.

In the conventional example configured as described above, the object A to be cut is held in a sheet-like superposed state, and is intermittently transferred at a predetermined pitch via the feed roller 55. Then, after the object A to be cut is heat-fused to each predetermined size by the sequential welder 56, the linear cutting device 57 and the curve cutting device 60 are operated in conjunction with each other to move the object A in the width direction. Along with the straight line cutting, the waste bag 51 shown in FIG. 6 is manufactured by bending and cutting into a substantially W shape.

[0005]

[Problems to be solved by the device]

 By the way, since the conventional curve cutting device 60 bends the endless drive chain 61 into a substantially W-shape as described above and bends and cuts the object A with the cutter 62, While its structure is extremely simple and can be provided at low cost, the endless drive chain 61 is loose and wavy easily, which not only makes it difficult to make a reliable bending cut, but also improves cutting efficiency. It was not always satisfactory in terms of quality.

The present invention intends to solve the conventional problems all at once, and to provide a convenient curve cutting device that can flexibly cut an object A made of a synthetic resin film quickly and reliably and efficiently. To do.

[0007]

[Means for Solving the Problems]

 That is, the present invention is directed to a horizontal feed mechanism 2 of a required length, which is arranged below the long-cylindrical synthetic resin film to-be-cut object A so as to be orthogonal to the transfer direction. The vertical feed mechanism 4 mounted orthogonally to the vertical feed mechanism 4, the rotary holder 5 for the cutter standing upright on the vertical feed mechanism 4, and the rotary holder for the cutter for always holding the cutter 7 in the cutting direction. A cam mechanism 8/10 for controlling the rotation of the -5, and the lateral feed mechanism 2 and the vertical feed mechanism 4 are interlocked to operate while controlling the rotation of the cutter rotary holder 5 by the cam mechanism 8/10. As a result, the cutter 7 is always bent in a substantially W shape in the cutting direction.

[0008]

[Action]

 While controlling the rotation of the cutter rotation holder 5 by the cam mechanisms 8 and 10, the vertical feed mechanism 4 appropriately feeds vertically, and the lateral feed mechanism 2 feeds the cutter 7 in the cutting direction at all times. The object A to be cut is bent and cut in a W shape.

[0009]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. 1 is a curve cutting device which is arranged in front of the welder 56 so as to be positioned at the transfer level of the object A to be cut. 2 is a rodless cylinder which constitutes the curve cutting device 1. The rodless cylinder 2 is to be cut. It is horizontally arranged in a direction orthogonal to the transfer direction of the object A. 3 is a linear motor installed in parallel with the rodless cylinder 2 in order to reduce the load on the rodless cylinder 2. The linear motor 3 is linearly operated by operating at the same speed in synchronization with the rodless cylinder 2. It is supposed to perform horizontal feed. Reference numeral 4 denotes a linear motor which is vertically installed so as to be orthogonal to the rodless cylinder 2 and the linear motor 3 and is vertically mounted on a mover of the linear motor 4 via a bearing member 6 so as to face upward. The cutter rotary holder, 7 is a cutter for curve cutting which is detachably held upright on the cutter rotary holder 5, and 8 is the cutter rotary holder 5 so as to correspond to the rodless cylinder 2. A plate cam 10 having a substantially W-shaped cam groove 9 on the lower surface thereof is disposed on the upper surface of the cutter rotary holder 5 so as to slide along the cam groove 9 of the plate cam 8. And a pair of cam followers. Reference numeral 11 denotes a linear cutting cutter which is erected on the rodless cylinder 2 through a mounting column 12 so as to be positioned rearward of the curved cutting cutter 7, and 13 serves to press and support the cutting edge of the object A to be cut. It is a holding plate arranged on the traveling line of the object to be cut A.

Next, the operation of the embodiment configured as described above will be described. First, an object A to be cut, which is heat-fused with a predetermined size by a welder 56, is intermittently transferred onto the curve cutting device 1, and the fused portion is pressed and supported by a holding plate 13. After that, the rodless cylinder 2 and linear motors 3 and 4 are operated in conjunction with each other. Then, the rotary holder 5 for the cutter is appropriately vertically fed by the linear motor 4 while being rotationally controlled by the plate cam 8 via the cam follower 10, and is also laterally fed by the rodless cylinder 2 and the linear motor 3. As shown in FIG. 3, the curved cutting cutter 7 is held in the cutting direction at all times and bends and runs in a substantially W-shape to bend and cut the object A. At this time, the linear cutting cutter 11 travels linearly in synchronization with the curved cutting cutter 7 by the operation of the rodless cylinder 2, and cuts the object A to be cut linearly. When the cutting of the object to be cut A is completed, the cutting waste is sucked and removed by the suction fan (not shown) provided above, and the pressing plate 12 is automatically detached, and the cut dust bag 51 is folded. It is transferred to the next process such as a process.

When the cutting waste is removed and the dust bag 51 is transferred to the next step, the object A to be cut is again transferred onto the curved cutting device 1, and the rodless cylinder 2 and the linear motors 3 and 4 are operated. As a result, the curved cutting cutter 7 and the linear cutting cutter 11 start returning and traveling, and the object A to be cut is bent and linearly cut to form a dust bag. Similarly, while the rotation of the cutter rotation holder 5 is controlled by the cam mechanisms 8 and 10, the vertical feed mechanism 4 appropriately vertically feeds it, and the lateral feed mechanism 2 horizontally feeds it to the curved cutting cutter. 7 is always bent in a substantially W-shape toward the cutting direction to bend and cut the object to be cut A, and in parallel with this, the cutter 11 for straight line cutting is linearly moved to sequentially cut the object to be cut A. It is good to let it cut off.

Although the rodless cylinder 2 is shown as the lateral feed mechanism and the linear motor 4 is shown as the vertical feed mechanism in the above embodiments, the present invention is not limited to this, and a screw mechanism or Even if a known linear feed mechanism such as a slide mechanism is adopted, the object of the present invention can be achieved.

[0013]

[Effect of device]

 Since the present invention is constructed as described above, while the rotation of the cutter rotation holder 5 is controlled by the cam mechanisms 8 and 10, the vertical feed mechanism 4 appropriately feeds the vertical movement, and the horizontal feed mechanism 2 also feeds the horizontal feed. Then, the cutter 7 is always bent in a substantially W-shape in the cutting direction so that the object A can be bent and cut, and the object A made of a synthetic resin film can be bent and cut. It can be carried out quickly and reliably, and by extension, a bag made of synthetic resin such as the dust bag 51 can be formed extremely efficiently.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a side view in which the same portion is cut away.

FIG. 3 is a plan view showing the same operating state.

FIG. 4 is a plan view showing a conventional example.

FIG. 5 is a side view of the same.

FIG. 6 is a perspective view showing a dust bag 51.

[Explanation of symbols]

 1 Curve cutting device 2 Rodless cylinder 4 Linear motor 5 Rotating holder for cutter 7 Cutter for curve cutting 8 Plate cam 10 Cam follower A Object to be cut

Claims (1)

[Scope of utility model registration request] 1. A transverse feed mechanism 2 of a required length, which is disposed below the long tubular cylindrical object A made of a synthetic resin film so as to be orthogonal to the transport direction, and on the transverse feed mechanism 2. The vertical feed mechanism 4 mounted orthogonally, the cutter rotary holder 5 standing on the vertical feed mechanism 4, and the cutter rotary holder 5 for always holding the cutter 7 in the cutting direction. 5 is constituted by a cam mechanism 8/10 for controlling the rotation of the cutter 5. By controlling the rotation of the cutter rotation holder 5 by the cam mechanism 8/10, the lateral feed mechanism 2 and the vertical feed mechanism 4 are operated in conjunction with each other. Approximately W with the cutter 7 always facing the cutting direction
A curve cutting device at the time of manufacturing a bag made of a synthetic resin film, which is characterized by bending and running in a letter shape.