The present invention relates to a sheet cutting machine for conveying a sheet and cutting the sheet in a direction perpendicular to a conveying direction.
In the prior art, a sheet cutting machine conveys sheets one by one along a conveying path, cuts each of the sheets into margins and desired size of products, removes the margins from the conveying path, and thereby stacks only the products on a tray. The sheet cutting machine, for example, comprises a slitting unit arranged to cut the sheet in a conveying direction using slitters, and a cutting unit arranged downstream of the slitting unit to cut the sheet in a direction perpendicular to the conveying direction using a pair of cutting blades.
The cutting unit includes a pair of upstream conveying rollers to convey the sheet along the conveying path, a pair of cutting blades arranged downstream of the upstream conveying rollers to cut the sheet into the products and the margins, and a pair of downstream conveying rollers arranged downstream of the cutting blades to convey along the conveying path the products cut off from the sheet.
In order to separate a margin of the sheet front end from the sheet and remove the margin from the conveying path, the cutting unit first conveys the sheet using the upstream conveying rollers in such a manner that the sheet is travelled from a gap between the pair of the cutting blades by a predetermined length. The cutting unit then cuts the sheet in the direction perpendicular to the conveying direction using the pair of the cutting blades. Thereby, the margin of the sheet front end is separated from the sheet and removed from the conveying path by falling down from a gap between the cutting blades and the downstream conveying rollers.
However, when the length in the conveying direction of the margin is longer than a distance between the cutting blades and the downstream conveying rollers, it is impossible to remove the margin from the conveying path in one cutting operation described above. This is because the sheet is received by the downstream conveying rollers when being conveyed by the upstream conveying rollers, and as a result, the margin which has been cut off from the sheet is conveyed along the conveying path by the downstream conveying rollers.
Each of Patent Literatures 1 and 2 discloses a sheet cutting machine which can solve such a problem. In the sheet cutting machines of Patent Literatures 1 and 2, when the length in the conveying direction of the margin is equal to or longer than a distance between the cutting blades and the downstream conveying rollers, the margin is cuts off in several cutting operations instead of one cutting operation described above.
Conveyance of the sheet by the upstream conveying rollers needs to be temporarily paused while the sheet is cut. In other words, in order to separate the margin from the sheet in the several cutting operations described above, conveyance of the sheet has to be paused during every cutting operation. This reduces the efficiency of the sheet cutting machine.
[Patent Literature 1] Japanese Patent Laid-Open No. 2013-82522
[Patent Literature 2] Japanese Patent Laid-Open No. 2001-232700
An object of the present invention is to provide a sheet cutting machine capable of separating a margin from the sheet in one cutting operation and reliably removing the margin from the conveying path even when a length in a conveying direction of the margin is long.
According to the present invention, there is provided a sheet cutting machine for cutting a first sheet into second sheets and margins, the machine comprising:
a first conveying part arranged to convey the first sheet along a conveying path;
a cutting part arranged downstream of and apart from the first conveying part to cut the first sheet in a direction perpendicular to a conveying direction;
a sorting unit arranged to remove the margins from the conveying path, the margins being cut off from the first sheet by the cutting part; and
a control unit configured to control the first conveying part, the cutting part and the sorting unit based on cutting information about cutting of the first sheet.
The sorting unit includes:
a second conveying part arranged downstream of and apart from the cutting part to receive the first sheet from the first conveying part and to convey the second sheets cut off from the first sheet by the cutting part; and
a retracting mechanism arranged to upwardly retract the second conveying part from the conveying path.
When a length in the conveying direction of the margin to be cut off is shorter than a predetermined distance between the cutting part and the second conveying part, the first sheet is fed to the cutting part by the first conveying part while the second conveying part is kept positioned at the conveying path, and the margin is cut off from the first sheet by the cutting part. When the length is equal to or longer than the predetermined distance, the first sheet is fed to the cutting part by the first conveying part after the second conveying part is retracted from the conveying path by the retracting mechanism, and the margin is cut off from the first sheet by the cutting part.
The sorting unit may further include a deflecting plate for deflecting the first sheet to the outside of the conveying path while the first sheet is conveyed by the first conveying part. The deflecting plate may be moved together with the second conveying part by the retracting mechanism. It is preferable that the deflecting plate is apart from the conveying path when the second conveying part stays at the conveying path, and that the deflecting plate stays at the conveying path when the second conveying part is apart from the conveying path.
The sheet cutting machine may further comprise a frame having the conveying path. The sorting unit may further include a pair of support plates arranged in a vertically swingable manner relative to the frame about a horizontal axis perpendicular to the conveying direction. The pair of the support plates may be opposite to each other in a direction perpendicular to the conveying direction so as to support the second conveying part. The retracting mechanism may retract the second conveying part from the conveying path by upwardly swinging the support plates.
The second conveying part may include a pair of conveying rollers rotatably supported by the support plates and extending perpendicularly to the conveying direction and horizontally.
The sorting unit may further include:
a third conveying part arranged downstream of and apart from the second conveying part to receive the second sheets from the second conveying part and to convey the second sheets; and a guide plate attached to the support plates and arranged between the second conveying part and the third conveying part to guide the second sheets from the second conveying part to the third conveying part.
The cutting part may include a pair of cutting blades vertically opposite to each other with the conveying path interposed therebetween.
In the sheet cutting machine according to the present invention, when the length in the conveying direction of the margin to be cut off is equal to or longer than the predetermined distance between the cutting part and the second conveying part, the retracting mechanism upwardly retracts the second conveying part from the conveying path, and then the first conveying part feeds the first sheet to the cutting part. Therefore, the first sheet is prevented from coming into contact with the second conveying part when being fed to the cutting part. The margin which has been cut off is removed from the conveying path by falling down without coming into contact with the second conveying part.
Thus, the margin is separated from the first sheet in only one cutting operation and reliably removed from the conveying path, even when the margin has any length in the conveying direction. The efficiency of the sheet cutting machine can be improved because the several cutting operations are not required for the separation of the margin.
A sheet cutting machine according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
With reference to
A sheet conveying unit 3 is arranged downstream of the sheet feeding unit 2 to convey along the conveying path G the sheet S0 fed from the sheet feeding unit 2 while correcting a skew of the sheet S0. A creasing unit 4 is arranged downstream of the sheet conveying unit 3 to receive the sheet S0 from the sheet conveying unit 3 and to crease the sheet S0. A perforating unit 5 is arranged downstream of the creasing unit 4 to receive the sheet S0 from the creasing unit 4 to perforate the sheet S0.
As shown in
A cutting unit 7 is arranged downstream of the slitter unit 6. The cutting unit 7 receives the sub-sheets S0 from the slitter unit 6 and cuts each of the sub-sheets S (corresponding to a first sheet defined in the claims) into the products P (corresponding to second sheets defined in the claims) and margins M1. Further, a sorting unit 8 is arranged to remove from the conveying path G the margins M2 cut off.
A stacking unit 9 is arranged downstream of the sorting unit 8 to receive the products P from the sorting unit 8 and to stack the products P.
As shown in
As shown in
As shown in
Referring to
The cutting part 15 includes a pair of cutting blades 150 and 151 vertically opposite to each other with the conveying path G interposed therebetween, and extending perpendicularly to the conveying direction Y and horizontally. A blade drive mechanism (not shown) is arranged to vertically move the upper blade 150 relative to the lower blade 151.
Referring to
The second conveying part 16 includes a pair of second conveying rollers 160 and 161. Each of the conveying rollers 160 and 161 is supported by the support plates 17 rotatably about a shaft thereof and extends perpendicularly to the conveying direction Y and horizontally. The pair of the second conveying rollers 160 and 161 is driven by a second roller drive mechanism (not shown). The second conveying part 16 further includes a front plate 162 attached to the support plates 17 and arranged upstream of the pair of the second conveying rollers 160 and 161, and an inlet port 163 formed in the front plate 162. The sub-sheet S1 is conveyed by the first conveying part 14 along the conveying path G through the inlet port 163, and then received by the pair of the second conveying rollers 160 and 161.
The sorting unit 8 further includes a third conveying part 18 arranged downstream of and apart from the second conveying part 16 to receive the products P from the second conveying part 16 and to convey the products P to the stacking unit 9. The third conveying part 18 includes a pair of the third conveying rollers 180 and 181 extending perpendicularly to the conveying direction Y and horizontally, and driven by a third roller drive mechanism (not shown). The upper roller 180 is attached to the support plates 17 rotatably about a shaft thereof. The lower roller 181 penetrates the support plates 17 and is attached to the frame 1 rotatably about a shaft thereof.
A guide plate 19 is attached to the support plates 17 and is arranged between the second conveying part 16 and the third conveying part 18 to guide the products P from the second conveying part 16 to the third conveying part 18.
The pair of the support plates 17 is supported by the shaft of the lower roller 181 in a vertically swingable manner about the shaft. Thereby, the pair of the support plates 17 is arranged in a vertically swingable manner relative to the frame 1 about a horizontal axis perpendicular to the conveying direction Y.
Further, the sorting unit 8 includes a deviating plate 20 attached to the pair of the support plates 17, arranged below the second conveying part 16, and extending perpendicular to the conveying direction Y and horizontally. The deviating plate 20 has an arc-shaped cross section. The deviating plate 20 is arranged for deviating the sub-sheet S1 to the outside of the conveying path G while the sub-sheet S1 is conveyed by the first conveying part 14, as described in detail below.
The soring unit 8 further includes the retracting mechanism 21 arranged to upwardly retract the second conveying part 16 form the conveying path G.
A motor 22 is mounted on the frame 1 and is arranged below the conveying path G. An output shaft 220 of the motor extends perpendicularly to the conveying direction Y and horizontally. A first arm 23 is attached to the output shaft 220 at one end thereof. A roller 24 is rotatably attached to the other end of the first arm 23.
A support shaft 25 is attached to the frame 1 and extends perpendicularly to the conveying direction Y and horizontally. A second arm 26 is supported by the support shaft 25 at one end thereof in a vertically swingable manner about the support shaft 25. A slot 260 extending in the longitudinal direction of the second arm 26 is formed in the other side of the second arm 26. The roller 24 of the first arm 23 is inserted in the slot 260 in such a manner that the roller 24 can roll along the slot 260.
A third arm 27 is attached to the second arm 26 at one end thereof and is attached to the support plate 17 at the other end thereof.
When the first arm 23 is rotated by driving of the motor 22, the second and the third arms 26 and 27 vertically swing, and thereby the support plates 17 vertically swing about the lower roller 181 as shown in
Because the deviating plate 20 is attached to the support plates 17, the deviating plate 20 is moved together with the second conveying part 16 by the retracting mechanism 21. As shown in
A position sensor 28 is arranged to detect that the second conveying part 16 stays at the conveying path G.
The retracting mechanism 21 is structured as described above.
As described in detail below, the control unit 12 controls the first to third conveying parts 14, 16 and 18, the cutting part 15 and the retracting mechanism 21 based on the cutting information about cutting of the sub-sheet S1 obtained in advance in such a manner that the sub-sheet S1 is divided into the products P and the margins M1, and the margins M1 are removed from the conveying path G, and that only the products P are conveyed to the stacking unit 9.
The cutting information includes information about the cutting locations on the sub-sheet S1, information about the lengths in the conveying direction of the margins M1 and the products P to be cut off from the sub-sheet S1, and so on. An operator can input the cutting information through the input part 13. The control unit 12 receives the cutting information from the input part 13. Alternately, the control unit 12 may receive the cutting information from the processing machine such as a printer for printing on the sheet S0 arranged upstream of the sheet cutting machine. The control unit 12 may obtain the cutting information by imaging a mark (not shown) such as a barcode provided on the margin M0 of the sheet S0 with a camera 30 (see
As shown in
The control unit 12 stores in advance the predetermined distance X between the cutting part 15 and the second conveying part 16. In this embodiment, the predetermined distance X is defined as a distance between a cutting position C on the conveying path G where the cutting blades 150 and 151 cut sub-sheet S1, and the upstream end of the inlet port 163 in the second conveying part 16 positioned at the conveying path G.
The cutting operation of the sub-sheet S1 will be described below.
As shown in
The control unit 12 compares the length L1 with the distance X.
When the length L1 is smaller than the distance X (L1<X), as shown in
The conveyance of the sub-sheet S1 is temporarily paused during cutting of the sub-sheet S1. The same is applied hereinafter.
The margin M1 cut off falls down from a gap between the cutting part 15 and the second conveying part 16, and consequently is removed from the conveying path G.
When the length L1 is equal to or longer than the distance X1 (L1>=X), as shown in
The front end of the sub-sheet S1 is formed of the product P, because the margin M1 having the length L1 in the conveying direction has been cut off. Subsequently, this product P is cut off from the sub-sheet S1.
As shown in
After the product P is cut off, the front end of the sub-sheet S1 is formed of the margin M1 having the length L2 in conveying direction. Subsequently, this margin M1 is cut off from sub-sheet S1.
The control unit 12 compares the length L2 in the conveying direction of the margin M1 with the distance X.
When the length L2 is smaller than the distance X (L2<X), the sub-sheet S1 is fed to the cutting part 15 by the first conveying part 14, and travelled between the cutting blades 150 and 151 by the length L2 from the cutting position C, while the second conveying part 16 is kept positioned at the conveying path G. The margin M1 is then cut off from the sub-sheet S1 by the cutting part 15 and falls down. At the same time, the product P which has been cut off previously is conveyed along the conveying path G to the stacking unit 9 by the second and third conveying parts 16 and 18, and then stacked.
When the length L2 is equal to or longer than the distance X (L2>=X), as shown in
At the same time, as shown in
Thereafter, the products P and the margins M1 are alternately cut off from the sub-sheet S in the same way.
A last margin M1 formed of the back end of the sub-sheet S1 and having a length L3 in the conveying direction is removed from the conveying path G in the different way.
In brief, when the length L3 is short, the last margin M1 is not held by the first conveying part 14 during cutting of the last product P. As a result, the last margin M1 falls down from a gap between the first conveying part 14 and the cutting part 15. When the length L3 is so long that the last margin M1 is held by the first conveying part 14, the margin M1 is fed by the first conveying part 14 and then divided into two margins by the cutting part 15. One of the divided margins falls down from the gap the between the first conveying part 14 and the cutting part 15. The other of the divided margins falls down from a gap between the cutting part 15 and the second conveying part 16. The second conveying part 16 is kept retracted from the conveying path G by the retracting mechanism 21 if necessary while the last margin M1 is fed by the first conveying part 14.
Such cutting of the sub-sheet S1 is performed for the sub-sheets S1 which are conveyed one by one to the cutting unit 7.
As described above, the length L1 or L2 in conveying direction of the margin M1 to be cut off is equal to or longer than the predetermined distance X, the sub-sheet S1 is fed to the cutting part 15 by the first conveying part 14, after the second conveying part 16 is retracted from the conveying path G by the retracting mechanism 21. Therefore, the sub-sheet S1 is prevented from coming into contact with the second conveying part 16 and from being received by second conveying part 16, while being fed to the cutting part 15 for cutting off of the margin M1.
Consequently, the margin M1 is separated from the sub-sheet S1 in only one cutting operation and reliably removed from the conveying path G even when the margin M1 has a length in the conveying direction longer than the distance X. Further, the efficiency of the sheet cutting machine can be improved because several cutting operations are not required for the separation of the margin M1.
Although the embodiment of the present invention has been described above, the present invention is not restricted to the above embodiment.
In the above embodiment, the second conveying part 16 includes the front part 162 and the inlet port 163. In alternative embodiment, the second conveying part 16 may not include these. The retracting mechanism 21 may vertically and linearly move the second conveying part 16 instead of vertically swinging it.
The slitter unit 6 may be arranged between the sorting unit 8 and the stacking unit 9 instead of being arranged upstream of the cutting unit 7.
In this case, referring to
Filing Document | Filing Date | Country | Kind |
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PCT/JP2015/070914 | 7/23/2015 | WO | 00 |