JP2005007484A - Sack cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of cutting a sack storing a long size material in one process. <P>SOLUTION: This device cuts a sack 95 continuously wrapping a straight tube-shaped fluorescent tube 80 (a long size material) in the longitudinal direction between adjacent fluorescent tubes 80. This cutting device has rotatingly driven disk-like first and second cutters 22, and a cutter moving means. The cutter moving means moves the first cutter 22 to a just under position from a just above position of the sack 95 or to the just above position from the just under position every time when cutting the sack 95. The second cutter 22 is moved in the inverse direction of the first cutter in synchronism with the first cutter 22. The first cutter 22 draws a locus L of cutting a substantially left half of the sack 95, while avoiding an electrode 81 (a projection) of the fluorescent tube 80 in the movement. The second cutter 22 draws a locus R of cutting a substantially right half of the sack 95, while avoiding the electrode 81 in the movement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for cutting a sack enclosing a long object such as a straight tube fluorescent tube.
[0002]
[Prior art]
As disclosed in Japanese Utility Model Laid-Open No. 6-87282, it is well known to protect a fluorescent tube during transportation and storage by wrapping the straight fluorescent tube with a sac having a square cross section. The sac has a length approximately equal to the fluorescent tube.
[0003]
The present applicant has mounted the sac on the fluorescent tube as follows (there is no patent document). That is, the belt-shaped wrapping paper is intermittently conveyed as it is pulled out from the roll. This wrapping paper is formed into a sack having a square cross section by a forming device in the course of conveyance. The fluorescent tube is fed into the molding apparatus in synchronism with the wrapping paper to wrap the fluorescent tube with a sack. When the fluorescent tube is wrapped in a sack over its entire length and exceeds the cutting position in the vicinity of the molding apparatus, the conveyance of the wrapping paper and the fluorescent tube is temporarily stopped. At this time, the fluorescent tube located in the molding device in front of the cutting position is partially wrapped in a sack in the middle of molding. At the time of this temporary stop, one side of the sac is cut between the adjacent fluorescent tube, that is, the fluorescent tube beyond the cutting position and the fluorescent tube before the cutting position.
[0004]
A slit extending in the width direction is formed on the wrapping paper before entering the molding apparatus. The slits are formed at sites corresponding to the three sides of the molded sack. As a result, the sack is cut over the entire circumference by cutting the remaining one side of the sack with the cutting device. In this way, a sack having an approximately equal length is mounted for each fluorescent tube.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 6-87282 (FIG. 8)
[0006]
[Problems to be solved by the invention]
In the above process, two steps of slit formation and one side cutting of the sack by the cutting device are required for sack cutting, and the cutting position of one side by the cutting device and the position of the slit may be misaligned, and the cutting trace is left. I sometimes became ugly. In addition, since slits are formed at portions corresponding to the three sides of the sack at the stage of the wrapping wrapping paper, the strength of the wrapping paper is lowered and the conveyance speed cannot be increased, and the time required for the sack mounting process is shortened. I could not.
[0007]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and a sack, which is wrapped in a linear shape and has a protrusion at least at one end so as to be continuous in the longitudinal direction, is formed between adjacent long objects. And a pair of cutter-shaped cutters that are driven to rotate, and a cutter moving means, and the cutter moving means is provided on the first side of the sack each time the sack is cut. The movement of the first cutter from the first position to the second position on the other side and the movement of the first cutter from the second position to the first position are alternately executed repeatedly, and the second cutter is synchronized with the first cutter. Then, the first cutter moves in a direction opposite to the first cutter between the first and second positions, and the first cutter draws a trajectory for cutting at least half of the sack while avoiding the projection of the long object during the movement. The second cutter moves in the above movement While avoiding the protrusion of material web is summarized in that you draw a locus of cutting at least the other half of the sack.
[0008]
According to the said structure, a sack can be cut | disconnected by one process with a pair of cutter. In addition, since the sack is cut by synchronizing the pair of cutters, the cutting can be performed in a short time with a simple structure. Furthermore, since the cutter draws a trajectory that avoids the projections of long objects, it can be avoided that the cutters hit each other, and the projections can be prevented from being damaged by the cutter even if the long objects are arranged close to each other. Can do. Moreover, if it is used in a sack mounting line that involves the conveyance of wrapping paper, it is not necessary to form slits in the wrapping paper, and the strength of the wrapping paper does not decrease, so the conveyance speed can be raised. As a result, the sack mounting time for a long object can be shortened.
[0009]
Preferably, the first and second cutters are rotatably supported by a pair of cutter holders, respectively, and each cutter holder is provided with a rotation driving means for rotating the cutter, and the cutter moving means is configured to cut the sack. Reciprocating means for synchronously moving the pair of cutter holders in the opposite direction each time, and moving the cutter holder in the moving direction so that the first and second cutters draw the locus when the pair of cutter holders are moved. Cam means for swinging in the intersecting direction. According to this structure, the locus | trajectory which a cutter avoids the protrusion of a long thing can be drawn reliably.
[0010]
Preferably, the pair of cutter holders has a protruding portion protruding in a direction approaching each other, and the cutter is supported on a distal end portion of the protruding portion. Thereby, even if the cutter holder is separated, it is possible to easily obtain a structure in which the cutter cuts the sack.
[0011]
Preferably, the cam means includes a plate cam having a pair of cam grooves supported in a predetermined position and spaced apart in the opposite direction of the cutter holder, and a protrusion provided on each cutter holder and fitting into the cam groove. The cam groove has a curved portion that swells outward. Thereby, the locus | trajectory which a cutter avoids the protrusion of a long object with a simple structure can be obtained.
[0012]
Preferably, the reciprocating means includes a rotation shaft that is rotatably supported at a predetermined position and extends in parallel with the longitudinal direction of the sack, and a link whose central portion is connected to the rotation shaft so as not to be relatively rotatable. And a reciprocating rotation means for reciprocally rotating the rotation shaft in a predetermined angle range, and the end portions of the pair of cutter holders move in opposite directions in cooperation with both end portions of the link. Accordingly, the pair of cutter holders can be moved in the reverse direction in a simple structure with a simple structure.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a sack mounting line incorporating a sack cutting device according to an embodiment of the present invention will be described with reference to the drawings. This mounting line is for wrapping a straight fluorescent tube 80 (long object) having two electrodes 81 (protrusions) at both ends with a sack 95. As shown in FIG. 4, the electrode 81 is located inside the peripheral surface of the fluorescent tube 80. As shown in FIG. 1, the sack 95 is obtained by molding a band-shaped corrugated paper 90 (wrapping paper). The corrugated paper 90 has a two-layer structure of an outer layer paper 91 and an inner layer paper 92 as shown in FIGS. The inner layer paper 92 has a wave portion extending in the width direction and has a continuous wave shape in the longitudinal direction.
[0014]
As shown in FIG. 1, the sack mounting line includes a creasing roller 1, a folding roller 2, a forming device 3, and a cutting device 4 in order along the conveyance direction of the corrugated paper 90. The corrugated paper 90 is wound into a roll 90x, and is drawn out and conveyed by a conveying device (not shown) arranged in the molding device 3 or in the vicinity thereof.
[0015]
The corrugated paper 90 drawn from the roll 90x faces the folding roller 2 with the inner layer paper 92 facing up, and in the process, the four streaks 92a (concave lines) extending in the longitudinal direction to the inner layer paper 92 by the scoring roller 1. Is attached. The corrugated paper 90 folded back by the folding roller 2 faces the forming device 3 with the inner layer paper 92 facing down, and is formed into a sack 95 where the cross-sectional square is formed.
[0016]
The molding apparatus 3 includes two molding members 3 a and 3 a extending in the conveyance direction of the corrugated paper 90, and the molding members 3 a and 3 a are opposed to each other with the corrugated paper 90 interposed therebetween. The molded members 3a and 3a have a gradually changing cross-sectional shape from the starting end shape shown in FIG. 2 (A) to the terminal end shape shown in FIG. 2 (B), and the corrugated paper 90 passes through these forming members 3a and 3a. In the process, as shown in FIG. 3 and FIGS. 4A and 4B, it is bent downward, and the cross-sectional shape changes from a band shape to a cross-sectional square. This bending is performed at the four streaks 92a described above.
[0017]
A tape applicator (not shown) is disposed between the forming device 3 and the cutting device 4, and tape is attached to both side edges of the corrugated paper 90 folded into a square cross section as shown in FIG. 99 is pasted to complete the sack 95.
[0018]
Further, the sack mounting line includes a transport device (not shown) for transporting the fluorescent tube 80. This conveying device conveys the fluorescent tube 80 to the forming device 3 in synchronism with the corrugated paper 90 while keeping the fluorescent tube 80 below the corrugated paper 90 and being parallel to the conveying direction of the corrugated paper 90. Accordingly, the corrugated paper 90 is folded so as to wrap the fluorescent tube 80 by the molding apparatus 3 while being conveyed together with the fluorescent tube 80, thereby forming a sack 95.
[0019]
The corrugated paper 90 is temporarily stopped together with the fluorescent tube 80 in the middle of being folded so as to wrap the fluorescent tube 80. At this stage, as shown in FIGS. 1 and 3, the fluorescent tube 80 in the middle of attachment is positioned in front of the cutting position S, and the cutting position S is in a state where the other fluorescent tube 80 is completely wrapped in the sack 95. Is over. These fluorescent tubes 80 are arranged so as to be continuous with each other in the longitudinal direction, and their electrodes 81 are close to each other.
[0020]
In the stop state, the sac 95 is cut by the cutting device 4 between the fluorescent tube 80 beyond the cutting position S and the fluorescent tube 80 before the cutting position S. Then, the fluorescent tube 80 beyond the cutting position S is carried out by another transport device in a state of being wrapped in a sack 95 having substantially the same length. The fluorescent tube 80 in front of the cutting position S is left together with the sack 95 being formed. Subsequently, when the conveyance of the corrugated paper 90 and the fluorescent tube 80 is resumed, the full length is wrapped by the full length sack 95 of the fluorescent tube 80 that is in front of the cutting position S. Then, immediately after the end of the fluorescent tube 80 exceeds the cutting position, the feeding of the fluorescent tube 80 and the corrugated paper 90 is stopped and the cutting is performed again.
[0021]
Next, the detailed structure and operation of the cutting device 4 will be described with reference to FIGS. FIG. 5 is a side view of the cutting device 4 viewed from a direction orthogonal to the feeding direction of the fluorescent tube 80 and the sack 95. FIGS. 6 to 8 show the cutting device 4 along the feeding direction of the fluorescent tube 80 and the sack 95. FIG. In the following description, “left and right” means the left and right in FIGS.
[0022]
As shown in FIGS. 5 and 6, the cutting device 4 includes a base plate 10 having a flat plate shape orthogonal to the feeding direction of the fluorescent tube 80. As shown in FIG. 5, the base plate 10 is supported by an XY stage 11 and a Z-axis stage 12 so that the position of the base plate 10 can be adjusted in the horizontal two-axis direction and the vertical direction, but substantially constitutes a fixed system.
[0023]
The cutting device 4 includes a pair of left and right cutter holders 20 disposed in the vicinity of the base plate 10. The cutter holder 20 has an elongated plate shape extending in the vertical direction and is parallel to the base plate 10. The upper end portion of the cutter holder 20 has a bent shape, and has a protruding portion 21 that is inclined so as to approach each other as it goes upward. A disc-shaped cutter 22 (first and second cutters) is rotatably supported at the tips of the protrusions 21 of the pair of cutter holders 20.
[0024]
The cutter holder 20 is provided with a rotation driving means 25 for rotating the cutter 22. The rotation driving means 25 includes a motor 26, three pulleys 27a, 27b, and 27c and two belts 28a and 28b. The motor 26 is fixed near the lower end of the cutter holder 20, and a pulley 27a is fixed to the output shaft thereof. The pulley 27 b is rotatably supported on the base end portion of the protruding portion 21 of the cutter holder 20. The pulley 27 c is connected to the cutter 22 so as not to rotate with respect to the cutter 22, and is rotatably supported at the distal end portion of the protruding portion 21. A belt 28a is hung between the pulleys 27a and 27b, and the belt 28b is also hung on the pulleys 27b and 27c. Accordingly, the rotation of the motor 26 is transmitted to the cutter 22 through the pulley 27a, the belt 28a, the pulley 27b, the belt 28b, and the pulley 27c in this order.
[0025]
The pair of left and right cutter holders 20 are moved up and down by the cutter moving means 15 while swinging left and right synchronously. At the time of this raising / lowering, when the one cutter holder 20 raises, the other cutter holder 20 falls, and the moving direction is reverse.
[0026]
The cutter moving means 15 includes an elevating means 30 (reciprocating means) and a cam means 40. The elevating means 30 is linked to the lower end (one end) of the cutter holder 20 and plays a role of elevating the cutter holder 20. The elevating means 30 includes a rotating shaft 31, a link 32, a reciprocating rotating means 35, a pair of rods 36, a pair of sliders 37, and a pair of vertical guides 38.
[0027]
The rotation shaft 31 is rotatably supported by the lower end portion of the base plate 10. A central portion of the link 32 is attached to the rotation shaft 31 so as not to be relatively rotatable.
The reciprocating rotation means 35 reciprocally rotates the rotating shaft 31 in a predetermined angular range, for example, an angle range of about 90 °, and is a lever whose one end is connected to the rotating shaft 31 so as not to be relatively rotatable. 35a and a rod 35b rotatably connected to the other end of the lever 35a, and the base end of the rod 35b is moved in the longitudinal direction by a cam rotated by a motor, that is, in the left-right direction in FIG. It is designed to reciprocate. By reciprocating movement of the rod 35b, the lever 35a and the rotating shaft 31 are reciprocally rotated, so that the link 32 is reciprocally rotated.
[0028]
Lower ends of a pair of left and right rods 36 are rotatably connected to both ends of the link 32, and a slider 37 is rotatably connected to the upper ends of the rods 36. The slider 37 is supported by a pair of left and right vertical guides 38 fixed to an intermediate portion of the base plate 10 so as to be movable up and down. Lower end portions of the pair of left and right cutter holders 20 are rotatably connected to the pair of left and right sliders 37.
[0029]
The cam means 40 includes a plate cam 41 fixed to the upper end of the base plate 10 and short columnar projections 45 provided on the pair of left and right cutter holders 20 respectively. The plate cam 41 is located between the base plate 10 and the cutter holder 20, and is parallel to the base plate 10 and the cutter holder 20. The plate cam 41 is formed with a pair of cam grooves 42 that have the same shape and are separated from each other on the left and right. The cam groove 42 has a curved portion that swells outward. The pair of left and right protrusions 45 are fitted in the pair of left and right cam grooves 42 of the plate cam 41.
[0030]
The operation of the cutting device 4 having the above configuration will be described. First, one cutting process will be described as an example. While the fluorescent tube 80 and the corrugated paper 90 are being transported, the link 32 is in a posture that rises to the right as shown in FIG. 6, the left cutter holder 20 is in the lower position, and the right cutter holder 20 is in the upper position. It is in. As a result, the left cutter 22 is positioned almost directly below the fluorescent tube 80 and the sack 95 (first position), and the right cutter 22 is positioned approximately directly above the fluorescent tube 80 and the sack 95 (second position). Yes.
[0031]
When the fluorescent tube 80 and the sack 95 are temporarily stopped, the reciprocating rotation means 35 is operated, the rod 35b is retracted as shown in FIG. 7, and the lever 35a is rotated 90 ° in the clockwise direction. As a result, the link 32 changes from a posture of rising right shoulder to a posture of rising left shoulder. In this process, the left cutter holder 20 is raised and the left cutter 22 is directly above the sack 95, and the right cutter holder 20 is lowered and the right cutter 22 is immediately below the sack 95.
[0032]
If the left and right cutter holders 20 are vertically raised and lowered, the left and right cutters 22 may hit each other, and the cutter 22 may damage the electrode 81 of the fluorescent tube 80. However, in the present embodiment, the left and right cutter holders 20 swing left and right around the lower end portion by the cam means 40 when moving up and down, so the above inconvenience can be avoided.
[0033]
More specifically, since the protrusion 45 of the left cutter holder 20 moves along the cam groove 42 curved outward when moving from the vicinity of the lower end of the left cam groove 42 to the vicinity of the upper end, the cutter holder 20 initially has a lower end portion. As a fulcrum, it swings to the left from the middle of swinging to the left. As a result, the peripheral edge of the left cutter 22 draws a locus L curved outward as shown in FIGS. Thus, the left cutter 22 can cut the substantially left half of the sack 95 while avoiding the electrode 81 of the fluorescent tube 80. Similarly, when the projection 45 of the right cutter holder 20 moves from the vicinity of the lower end of the right cam groove 42 to the vicinity of the upper end, the projection 45 moves along the cam groove 42 curved outward, so that the cutter holder 20 initially swings to the right. Swings to the left. As a result, the peripheral edge of the right cutter 22 draws a locus R curved outward. Accordingly, the right cutter 22 can cut the substantially right half of the sack 95 while avoiding the electrode 81 of the fluorescent tube 80.
[0034]
After the cutting step, the fluorescent tube 80 and the sack 95 are transported again and then temporarily stopped again. In this stopped state, the reciprocating rotation means 35 is actuated again, the rod 35b is advanced, and the lever 35a is rotated 90 ° counterclockwise. As a result, the link 32 changes from the posture of raising the left shoulder in FIG. 7 to the posture of raising the right shoulder in FIG. In this process, when the left cutter holder 20 is lowered, the left cutter 22 draws the locus L to reach a position directly below the sack 95, and at the same time, the right cutter holder 20 is raised. As a result, the right cutter 22 draws the locus R from the position just below the sack 95 to the position just above. As a result, the left cutter 22 cuts substantially the left half of the sack 95 and the right cutter 22 cuts substantially the right half of the sack 95 as in the previous cut.
[0035]
As described above, the cutting operation is repeated by alternately repeating the pulling operation and the pushing operation of the rod 35b each time the conveyance is temporarily stopped. Since the sack 95 can be cut simultaneously in one step by the pair of cutters 22, work efficiency can be improved.
[0036]
The present invention is not limited to the above embodiment, and various forms can be adopted. For example, the cutter may cut the upper half and the lower half of the sack by moving the pair of cutter holders in the left-right direction.
[0037]
【The invention's effect】
As described above, according to the present invention, a sack can be cut in one step by a pair of cutters. In addition, since the sack is cut by synchronizing the pair of cutters, the cutting can be performed in a short time with a simple structure. Furthermore, since the cutter draws a trajectory that avoids the projections of long objects, it can be avoided that the cutters hit each other, and the projections can be prevented from being damaged by the cutter even if the long objects are arranged close to each other. Can do.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing a sack mounting line.
FIGS. 2A and 2B are cross-sectional views showing a forming apparatus for forming a sack from corrugated paper in the sack mounting line, where FIG. 2A shows a start side and FIG. 2B shows a terminal side.
FIG. 3 is a cross-sectional view showing a process of attaching a sack to a fluorescent tube by the molding apparatus.
4A is an enlarged cross-sectional view of a corrugated paper and a fluorescent tube before molding, FIG. 4B is an enlarged cross-sectional view of a sack and a fluorescent tube after molding, and FIG. 4C is an enlarged cross-sectional view showing the locus of the cutter. is there.
FIG. 5 is a side view of a sack cutting device installed in the sack mounting line and constituting an embodiment of the present invention.
FIG. 6 is a front view showing a state immediately before cutting of the cutting device in a cutting process.
FIG. 7 is a front view showing a state after the cutting of the cutting apparatus is completed.
FIG. 8 is an enlarged front view of a main part showing a locus of a cutter in the cutting apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Base plate 15 Cutter moving means 20 Cutter holder 21 Protrusion part 22 Cutter 25 Rotation drive means 30 Lifting means (reciprocating means)
31 rotating shaft 32 link 35 reciprocating rotating means 40 cam means 41 plate cam 42 cam groove 45 protrusion 80 fluorescent tube 90 corrugated paper (wrapping paper)
95 Sack

Claims (5)

In a device for cutting a sack, which is wrapped in a straight line and has a protrusion at least at one end, wrapped in a line in the longitudinal direction, between adjacent long objects, the first and second disk-shaped disks are driven to rotate. A second pair of cutters and cutter moving means;
The cutter moving means moves the first cutter from the first position on one side of the sack to the second position on the other side of the sack and moves the first cutter from the second position to the first position. The second cutter is moved between the first and second positions in the opposite direction to the first cutter in synchronization with the first cutter, and the first cutter Draw a trajectory that cuts at least half of the sack while avoiding the projection of the long object, and the second cutter traverses at least the other half of the sack while avoiding the projection of the long object during the movement The sack cutting device characterized by drawing. The first and second cutters are rotatably supported by a pair of cutter holders, and each cutter holder is provided with a rotational driving means for rotationally driving the cutter. The cutter moving means is A reciprocating means for synchronizing and moving the pair of cutter holders in opposite directions, and a direction in which the cutter holder crosses the moving direction so that the first and second cutters draw the locus when the pair of cutter holders moves. The sack cutting device according to claim 1, further comprising cam means for swinging the sack. The sack cutting device according to claim 2, wherein the pair of cutter holders have a protruding portion protruding in a direction approaching each other, and the cutter is supported at a tip portion of the protruding portion. The cam means includes a plate cam having a pair of cam grooves supported in a predetermined position and spaced apart from each other in the opposite direction of the cutter holder, and a projection provided on each cutter holder and fitting into the cam groove. The sack cutting device according to claim 2, wherein the sack cutting device has a curved portion that bulges outward. The reciprocating means includes a rotating shaft that is rotatably supported at a predetermined position and extends parallel to the longitudinal direction of the sack, a link having a central portion connected to the rotating shaft so as not to be relatively rotatable, and a rotating shaft. 3. A reciprocating means for reciprocatingly rotating the moving shaft within a predetermined angle range, wherein the ends of the pair of cutter holders move in opposite directions in cooperation with both ends of the link. The sack cutting device according to any one of 4.

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