JP2007217174A - Paper sheet feeding method and improvement of device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the rate of occurrence of defective products caused by disagreement between a printing position of a pattern on a paper sheet and a succeeding processing position by strictly controlling the horizontal direction of the sheet gripped by a grip claw. <P>SOLUTION: A camera 15 for detecting a printing mark and a light 16 for illuminating the printing mark are installed below among a fixing guide plate 6 supporting a paper sheet 1' in the lowermost part and a pair of paper feeding rolls 7, 8, and the camera 15 operates at fixed timing for letting the tip of the paper sheet 1' pass to allow a user to confirm a position of the printing mark printed on the paper sheet 1' in advance. The pair of paper feeding rolls 7, 8 rotate and move by a dimension indicated by a controller by being corresponding to the position of the printing mark confirmed by the camera 15 in the horizontal direction for the axial direction while feeding the paper sheet 1' so that a position of the paper sheet 1' is revised to a correct position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is to prevent product loss caused by lateral position fluctuations when paper sheets are extracted one by one from the bottom or top of a paper pile and supplied to subsequent processing steps. The present invention relates to an improved method and apparatus.

  A method of extracting paper sheets one by one from the lowermost or uppermost part of a paper pile and supplying them to a subsequent printing machine or punching machine has been known (see Patent Document 1).

  FIGS. 10 to 12 are views showing an example of a bottom feeder structure in which paper sheets are extracted one by one from the lowermost part used in the conventional method, FIG. 10 is a side view, FIG. 11 is a plan view, and FIG. FIG. 11 is a cross-sectional view taken along line XX.

  The operation of the bottom feeder will be described with reference to these drawings. When the paper sheets 1 'are extracted one by one from the lowermost part of the paper pile 1, and are supplied to a subsequent process such as a flat plate punching process, the extracted paper sheet 1 is extracted. 'Is sent to the front lay 10 through the pair of paper feed rolls 7 and 8. When the leading edge of the paper sheet 1 ′ reaches the front lay 10, the paper sheet 1 ′ collides with it and stops.

  A normal automatic flat plate punching machine has a plurality of front lays 10 as shown in FIG. 11 and is arranged between claws 12 of a plurality of gripper bars 11. When the leading edge of the paper sheet 1 ′ reaches the front lay 10, the gripper claw 12 is closed and grips the leading edge of the paper sheet 1 ′. Next, when the front lay 10 is lowered and the restriction of the front end position of the paper sheet 1 'is released, the gripper claw 12 moves to a punching portion (not shown) in the next process while holding the front end of the paper sheet 1'. .

  By the way, since the printed pattern is usually provided on the upper surface or the lower surface of the paper sheet 1 ′, the punching position at the time of punching and the position of the printed pattern need to be matched within an allowable range. Otherwise, defective products will be generated.

  In the conventional method, the front and rear direction is controlled by colliding and stopping the front end of the paper sheet 1 ′ with the front lay 10, and the lateral direction is controlled by a pair of side guides 13 and side joggers 14 provided in a paper pile stacking portion, that is, a hopper. The printed design and the punching position are made to coincide with each other.

  In this case, the paper pile 1 is operated by pressing the side jogger 14 paired with the side guide 13 by the air cylinder 17 for each batch of about 10 to 30 sheets and pressing the paper pile 1 against the side guide 13 to control the lateral direction. However, even if the edge of the paper sheet 1 ′ protruding due to the variation in the size of the paper sheet itself or the edge position of each paper sheet is pressed by the side jogger 14, the load of the batch weight on the paper sheet 1 ′ The sheet 1 'may not move in the horizontal direction simply because the edge is bent, and the pattern printed on the base paper itself already has position variations, so the horizontal control is not performed completely. This causes inconvenience.

  For this reason, generation | occurrence | production of the inferior goods by the mismatch of the printed design and punching position cannot be avoided. In recent years, in particular, the allowable range between the position of the printed pattern and the punching position tends to be strict, so products that have been accepted so far will be rejected as defective products, resulting in the occurrence of defective products. The rate is increasing.

Japanese Patent Laying-Open No. 2005-298078 (Claims and others)

  Under such circumstances, the present invention strictly controls the lateral direction of the sheet held by the gripper claw so that the printing position of the pattern on the paper sheet and the position of subsequent processing, for example, the punching position do not match. This was done for the purpose of reducing the incidence of defective products.

  The present inventors have conducted various studies on a method for strictly controlling the lateral position of a paper sheet extracted from a paper pile, and as a result, detected the position of a pattern printed in advance on the paper sheet with a viewing camera. Based on this finding, it was found that the object can be achieved by laterally moving the paper feed roll with respect to the positional deviation, and the present invention has been made based on this finding.

  That is, the present invention detects a position of a pattern printed on a paper sheet in a method for extracting paper sheets one by one from the lowermost or uppermost part of the paper pile and supplying the paper sheets to the subsequent process. The deviation between the position of the detected symbol and the detected symbol is measured, and based on the measured value, the paper feed roll is moved in the horizontal direction with respect to the traveling direction of the paper sheet, and the lateral deviation of the paper sheet is corrected. A sheet feeding method characterized by the above, and a front guide 2 and a back gate 4 which are bent at the lower end inward and used as a support portion 3 are set up in parallel, and a sheet 1 'is 1 from the lower end of the back gate 4. The suction belt 5 is disposed with an interval through which only the sheet can pass, and a pair of paper feed rolls 7 and 8 for receiving the paper sheet 1 ′ conveyed by the suction belt 5 through the fixed guide plate 6 are provided on the suction belt 5. In the paper sheet feeder arranged on the upper surface extension, Information from the printed symbol detection camera 15 and the printed symbol illumination light 16 and the camera is input to the position immediately before the paper sheet 1 ′ reaches the pair of paper feed rolls 7 and 8, and the lateral movement information of the paper feed roll is obtained. Provided is a paper feeding device characterized in that a control device for outputting is provided at an appropriate place and the paper feed roll pairs 7 and 8 are configured to be movable to the left and right with respect to the paper sheet traveling direction.

  According to the present invention, when paper processing is performed, it is possible to strictly control the lateral direction of the paper sheet during paper feeding without requiring a special inspection device or visual inspection work after punching. It is possible to suppress the generation of defective products and improve productivity.

  Next, the best mode for carrying out the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.

  By the way, it is normal that an automatic flat plate punching machine that is operated independently of the printing machine does not have a printing mark on the paper sheet 1 ′ that is the object of punching, but it is easy to correct a lateral shift. In order to achieve this, a printing mark can be applied in advance on the upper surface or the lower surface. The number of print marks is not particularly limited, and may be applied to one place or may be provided to a plurality of places.

  In this example, the case where the print mark is applied to one place will be described. However, in the method of the present invention, it is not necessary to apply the print mark in particular, and the same applies even when the print mark is not applied. Can do.

FIG. 1 is a side view for explaining the apparatus of the present invention, and FIG. 2 is a front sectional view of a paper feed roll portion of the apparatus of the present invention.
In these drawings, the paper sheet 1 ′ is regulated by the front guide 2 and the back gate 4 in the front and rear direction in the paper feeding direction, and the lowermost paper sheet 1 ′ is the support portion 3 provided at the lower end of the front guide 2 and the paper feeding belt. 5 is supported.

The lowermost paper sheet 1 ′ of the paper pile 1 is sequentially fed to the paper feed roll pairs 7 and 8 one by one by the paper feed belt 5.
A print mark 31 detection camera 15 and a print mark illumination light 16 are installed below the fixed guide plate 6 that supports the lowermost sheet 1 ′ and the pair of paper feed rolls 7 and 8.
The camera 15 is activated at a certain timing when the leading edge of the paper sheet 1 ′ passes, and the position of the print mark 31 printed in advance on the paper sheet 1 ′ is confirmed.

  While the print mark 31 is confirmed by the camera 15, the sheet 1 'is further fed to the next process, and when the leading end reaches the pair of paper feed rolls 7 and 8, as shown in FIG. Leaves the paper feed belt 5 and is fed to the next process by the gripping force of the paper feed roll pairs 7 and 8 only.

  The paper sheet 1 ′ slides on the fixed guide plate 9, and the pair of paper feed rolls 7 and 8 rotate until the leading edge of the paper sheet 1 ′ reaches the front lay 10, while feeding the paper sheet 1 ′. Corresponding to the position of the print mark 31 confirmed by the camera 15 in the direction, that is, in the lateral direction with respect to the traveling direction, it moves in the dimension designated by the control device 30. Therefore, when the leading edge of the paper sheet 1 ′ reaches the front lay 10, the position of the paper sheet 1 ′ is corrected to the correct position.

Next, the structure and operation of the paper feed roll 18 moving (actuating) in the axial direction will be described with reference to FIGS. 3, 4, and 5.
A pair of upper and lower sheet feed rolls 7 and 8 are pivotally supported at both ends by bearings 23,..., Rotate vertically in opposite directions, hold the sheet 1 ', and hold the sheet 1' and the sheet feed roll. It is conveyed in the direction of the front lay 10 and the gripper bar 11 by the frictional force between the pair 7 and 8.
The pair of paper feed rolls 7 and 8 includes paper feed roll bodies 24 and 25, paper feed roll shafts 26 and 27, and keys 28 and 29.

3 is a cross-sectional view taken along line XX of the paper feed roll bodies 24 and 25, FIG. 4 is a cross-sectional view taken along line YY of the paper feed roll, and FIG. It is explanatory drawing which shows these coupling | bonding relationships. In this figure, the paper feed roll bodies 24 and 25 are cylindrical, and the paper feed roll shafts 26 and 27 are inserted inside the holes. The inner diameters (holes) of the paper feed roll bodies 24 and 25 and the paper feed roll shafts 26 and 27 are inserted. There is a slight gap in the outer diameter.
The paper feed roll shafts 26 and 27 are processed with key grooves, and the keys 28 and 29 are fixed to the shafts. This key may be fixed to the roll in some cases.

  Further, there is a keyway on the hole side of the paper feed roll bodies 24, 25, and the keyway of the paper feed roll bodies 24, 25 is fitted to keys 28, 29 fixed to the paper feed roll shafts 26, 27. Yes. The feed roll bodies 24 and 25 are transmitted with the rotation of the feed roll shafts 26 and 27 by the keys 28 and 29. However, since there is a slight gap between the key and the key groove in the axial direction, the feed roll body 24 and 25 are slidable in the axial direction with respect to the paper feed roll shafts 26 and 27.

  In general, the paper feed roll bodies 24 and 25 are made of resin and the outer surface thereof is rubber-wrapped. The paper feed roll shafts 26 and 27 are made of steel whose surface is polished, and the resin roll can slide in the axial direction. Considered to be easy.

  A part of the outer circumference of the paper feed roll bodies 24 and 25 is grooved on the outer circumference of both the upper and lower rolls. As shown in FIG. 2, the grooves of the paper feed roll bodies 24 and 25 are shown in detail in FIGS. As shown, the yoke plates 21 and 22 are inserted.

  The thickness of the yoke plates 21 and 22 is slightly smaller than the groove width of the paper feed roll bodies 24 and 25, and there is a slight gap (usually about 0.1 mm) between the groove width and the yoke plates 21 and 22. The position of the paper roll main bodies 24 and 25 in the axial direction is restricted by the yoke plates 21 and 22, but the rotation direction is not affected at all.

  The yoke plates 21 and 22 engaged with the grooves of the paper feed roll bodies 24 and 25 are connected to the yoke moving devices 19 and 20, and the yoke plates 21 and 22 are operated by the yoke moving devices 19 and 20. 24 and 25 are moved in the axial direction.

The movement distance of the yoke plates 21 and 22 is determined by setting the amount of displacement a or b or a + b with respect to the camera reference line of the print mark 31 of the paper sheet 1 ′ detected by the camera 15 via the normal control device 30. The moving devices 19 and 20 are actuated to move the yoke plates 21 and 22, the paper feed roll main bodies 24 and 25, and the paper sheet 1 ′, thereby obtaining a certain print pattern 32 position and punching position 33 dimensions.
This series of operations is repeated for each sheet 1 ′ sequentially fed from the lower limit of the hopper.
As described above, the bottom feeder that extracts the paper sheet from the bottom of the paper pile has been described as an example. However, in the case of the top feeder that extracts the paper sheet from the top of the paper pile, the lateral misalignment can be similarly corrected. .

Next, the operation of the camera 15 and the light 16 will be described.
As shown in FIGS. 1, 2, and 6 (B), the position of the camera 15 in the horizontal direction of the camera 15 is preset to the D dimension from the end of the paper sheet 1 ′ to the print mark 31 with the side guide 13 as a reference. (Note that the position of the camera can be easily changed by a known method if the D dimension changes).

  As shown in FIG. 6 (b), the camera 15 is set so that the position of the print mark 31 is a predetermined reference position of the camera (in this example, the center of the camera 15) from the side guide 13 to the lateral position dimension D. The printed mark 31 of the paper sheet 1 'that is installed and passes above the camera 15 is confirmed, and the amount of deviation of the printed mark 31 from the reference position, that is, the dimension a or b or a + b as shown in FIGS. measure. The light 16 irradiates the position of the print mark 31 to help the camera 15 determine the print mark 31.

Next, with reference to FIGS. 6 to 9, the relationship, operation and effect of the printing symbol position 32, the position of the printing mark 31 and the punching position 33 with respect to the paper sheet 1 'when using the above-described apparatus will be described.

  6 to 9 show a printed pattern 32 and a small print mark 31 (generally a 3-5 mm square) with the paper sheet 1 'viewed from the printing surface. This print mark 31 is printed on the outer peripheral portion of a product (blank) punched out from a paper sheet 1 ′, which is generally processed as waste, that is, on the tail residue or side residue.

FIGS. 6A and 6B show a state in which the printed pattern 32 is applied to the correct position and a state in which the paper sheet 1 ′ is in contact with the side guide 13.
A dimension in the figure is the distance from the printed pattern 32 to the end face of the paper sheet 1 '. The dimension A is a dimension in a state where it is printed at a correct position. Further, the distance from the print mark 31 to the print pattern 32 is set as a C dimension. Note that the C dimension of the relative position between the print mark 31 and the print pattern 32 is always constant because it is simultaneously printed on the printing press.

  In this state, the paper sheet is fed from the bottom feeder, and the paper sheet 1 'is fed to the front lay 10 by the paper feed roll, is fed up to the gripper bar 11 and conveyed to the punching unit, and the paper sheet 1' is punched out. When this is done, the positional relationship is as shown in FIG.

The dotted line in FIG. 6 (A) shows the shape after punching, but the punching position 33 is set (fixed) by a machine so as to be B dimension from the position of the side guide 13, for example.
Therefore, when the punching process is performed, the dimensions to the printed pattern 32 and the punching position 33 are (AB) dimensions.

Next, in the state shown in FIG. 7B, the printed pattern 32 of the paper sheet 1 ′ is in the correct position, and the position of the paper sheet 1 ′ is shifted from the side guide 13 by a dimension (usually 1 to 4 mm). Is the case.
In this case, as shown in FIG. 7A, the dimension from the printed pattern 32 to the punching position 33 is (A−B) + a.

  In this case, the printed pattern 32 and the punching position 33 are shifted by the dimension a as compared with the AB dimension described above, resulting in a defective product. In such a case, the camera 15 detects the displacement of the printed mark 31. Then, via the control device 30 and the yoke moving devices 19 and 20, the yoke plates 21 and 22 are operated by the dimension a to move the paper feed roll bodies 24 and 25 holding the paper sheet 1 ', thereby moving the paper sheet 1 The sheet 1 ′ is fed from the bottom feeder to the front lay 10 and the gripper bar 11 while correcting the position of the sheet 1 ′ so that the dimension from the printed pattern 32 to the punching position 33 becomes (AB) dimension. By sending it, the generation of defective products is prevented.

Next, the state shown in FIG. 8B is a state where the position of the paper sheet 1 ′ is correctly in contact with the side guide 13, but the printed pattern 32 is shifted by b dimension.
In this case, the dimension from the position of the printed pattern 32 to the punching position 33 is (A−B) + b dimension. If the sheet is fed and punched as it is, the printed pattern 32 and the punching position 33 are shifted by the dimension b, resulting in a defective product.

  Therefore, in such a case, the camera 15 detects the displacement of the print mark 31 and operates the yoke plates 21 and 22 through the control device 30 and the yoke moving devices 19 and 20 to operate the paper sheet 1 'by moving the size b. While moving the gripped paper feed roll bodies 24 and 25 and correcting the position of the paper sheet 1 ′ so that the position from the printed pattern 32 to the punching position 33 becomes the dimension (AB), By feeding the paper sheet 1 ′ from the bottom feeder to the front lay 10 and the gripper bar 11, generation of defective products is prevented.

Next, the state shown in FIG. 9B is a state in which the position of the paper sheet 1 ′ is stacked with a dimension shifted from the side guide 13, and the printed pattern 32 is also printed with the b dimension shifted.
In this case, the dimension from the position of the printed pattern 32 to the punching position 33 is (A−B) + (a + b). If the sheet 1 ′ is fed and punched as it is, a product in which the printed pattern 32 having the dimension (a + b) is displaced is punched. Therefore, in such a case, the camera 15 detects the deviation of the print mark 31 and operates the yoke plates 21 and 22 by the (a + b) dimension via the control device 30 and the yoke moving devices 19 and 20 to make the sheet 1 The paper feed roll main bodies 24 and 25 holding 'are moved, and the position of the paper sheet 1' is corrected so that the position from the printed pattern 32 to the punching position 33 becomes the (AB) dimension. On the other hand, by feeding the paper sheet 1 'from the bottom feeder to the front lay 10 and the gripper bar 11, the generation of defective products is prevented.

  In this example, the feed roll main bodies 24 and 25 attached to the feed roll shafts 26 and 27 are moved in the axial direction by the yoke plates 21 and 22, but the feed roll shafts 26 and 27 and the feed roll are arranged. It is also possible to move the paper feed roll 18 in the axial direction together with the paper feed roll shafts 26 and 27 by fitting the main bodies 24 and 25.

  The present invention is suitably used when a sheet is fed one by one from the lower surface of a paper pile in a printing machine or a punching machine.

The side view of this invention apparatus. FIG. 3 is a front sectional view of a sheet feeding roll portion of the apparatus of the present invention. Sectional drawing along the XX line of FIG. Sectional drawing along the YY line of FIG. FIG. 3 is an explanatory diagram showing a relationship between a yoke plate and a paper feed roll body in FIG. 2. Explanatory drawing which shows the correction process based on the detected mark position in the method of this invention. Explanatory drawing which shows the correction process based on the detected mark position in the method of this invention. Explanatory drawing which shows the correction process based on the detected mark position in the method of this invention. Explanatory drawing which shows the correction process based on the detected mark position in the method of this invention. The side view of the conventional bottom feeder. The top view of the conventional bottom feeder. Sectional drawing along the XX line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper pile 1 'Paper sheet 2 Front guide 3 Support part 4 Back gate 5 Suction belt 6 Fixed guide plate 7, 8 Feed roll pair 9 Fixed guide plate 10 Front lay 11 Gripper bar 12 Claw 13 Side guide 14 Side jogger 15 Camera 16 Light 17 Air cylinder 18 Paper feed roll 19, 20 Yoke moving device 21, 22 Yoke plate 23 Bearing 24, 25 Paper feed roll body 26, 27 Paper feed roll shaft 28, 29 Key 30 Controller 31 Print mark 32 Print symbol position 33 Punching position

Claims (3)

  In the method of extracting sheets one by one from the bottom or top of the paper pile and supplying the sheets to the subsequent process, the position of the pattern printed on the sheet is detected, and the position of the predetermined pattern is detected. The paper is characterized in that the deviation of the detected pattern position is measured, and based on the measured value, the paper feed roll is moved in the lateral direction with respect to the traveling direction of the paper sheet to correct the lateral deviation of the paper sheet. Leaf feeding method.   The paper sheet feeding method according to claim 1, wherein a printing mark is provided for positioning separately from the printed pattern. The front guide and the back gate, which are bent at the lower end inward, are set up in parallel, and the suction belt is arranged with a space through which only one sheet can pass from the lower end of the back gate. In a paper sheet supply device in which a paper feed roll for receiving the conveyed paper sheet via a fixed guide plate is arranged on the upper surface extension of the suction belt, a printed pattern is detected at a position immediately before the paper sheet reaches the paper feed roll. A control device for inputting information from the camera for printing and the light for illuminating the printed pattern and the camera and outputting lateral movement information of the paper feed roll is provided at an appropriate position, and the paper feed roll is set in the paper sheet traveling direction. A sheet feeding device configured to be movable left and right.

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