JPH085963Y2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lead edge type paperboard feeding device applied to a box making machine for corrugated cardboard sheets and the like.

(Prior Art) FIGS. 4 and 5 show US Pat. Nos. 4,614,335 and 4681311.
FIG. 4 is an explanatory diagram of a configuration and a function (operation timing) of a conventional paper feeding device proposed in Japanese Patent No. 4828244.
Now, as shown in FIG. 4, in this type of sheet feeding device, the corrugated cardboard sheets 3 stacked on the sheet feeding table 2 are sent out by the roll 5
Is rotated so as to pass through the gap formed at the lower end portion of the front guide 4, and is sequentially carried out one by one from the lowermost sheet 3a. A suction box 6 connected to a suction blower 8 via a duct 7 is provided below a part of the corrugated board sheet 3. The suction box 6 is in a substantially sealed state by shielding the upper adsorption surface with the lowermost sheet 3a, and a negative pressure region is formed inside by the operation of the suction blower 8, so that the lowermost sheet 3a It functions to increase the frictional force Fo with the delivery roll 5 which is the transportation means.

Further, the delivery roll 5 part is provided with a receiving plate 10 which is disposed in a disposing gap of the roll 5 and whose relative height position with respect to the outer peripheral surface of the roll 5 can be varied. This receiving plate 10 attaches and detaches the lowermost sheet 3a that engages with the delivery roll 5 by vertically moving up and down. By lowering the sheet 3a from the sheet pass line, the outer peripheral surface of the delivery roll 5 and the lower surface of the sheet come into contact with each other. Then, the rotary conveyance force is applied, and conversely, the rotation conveyance force is actuated to cut off the conveyance function of the delivery roll 5.

Now, the corrugated board sheet 3 has a conveyance force f = which is generated to the sheet in the friction force Fo between the lowermost layer sheet 3a and the delivery roll 5 and the frictional force F between the lowermost layer sheet 3a and the second stage sheet 3b.
It is conveyed between the downstream feed rolls 9a and 9b by the action of Fo-F, and is further sent to the downstream printing process by the pinching rotation of the feed rolls 9a and 9b.

FIG. 5 shows the behavior of the sending roll 5 and the receiving plate 10 on the vertical axis with respect to the mechanical sheet feeding cycle (horizontal axis).
In contact with, is rotated (peripheral speed) thus transferring accelerated in the feed roll, downstream feed roll 9a, when the taken over the transport of the cardboard sheet 3a in 0 ₁ point that matches the peripheral speed of 9b, at substantially the same time The transfer function is canceled by raising the receiving plate 10. The delivery roll 5 continues to rotate, and after one rotation, stops at the point 0 ₂ . After the completion of one cycle, in transporting the next sheet 3b, the receiving plate 10 is lowered, and then the delivery roll 5 is rotated again to be delivered downstream as described above. Hereinafter, the same behavior is sequentially repeated so that the stacked corrugated cardboard sheets 3 are sequentially carried out from the lowermost layer sheet.

(Problems to be Solved by the Invention) However, although the conventional sheet feeding device described above is configured and functions as described above, it has the following problems. In other words, the corrugated sheet 3 has a long dimension because the rising timing of the receiving plate 10 that continues to be engaged with the feeding roll 5 used for carrying out the sheet is always constant with respect to the falling timing (no correction function). If so, increased frictional force (sliding resistance) of the lowermost sheet 3a and the second-stage sheet 3b
All of F is to be borne by the sandwiching rotation of the downstream feed rolls 9a and 9b, which is a major factor in delaying the paper feed timing. Further, the relative timing of the start timing (rotation start timing) of the delivery roll 5 cannot be changed, and the load conditions such as the machine speed, the weight of the sheets to be stacked (length and number of sheets to be stacked), the sheet material (coefficient of friction), etc. vary. Each time, the deviation of the sheet feeding (variation of the deviation amount) changes, and there is a problem that the printing and other subsequent processes are hindered.

Therefore, in order to correct the deviation of the sheet feeding timing in the downstream process, it is necessary to equip each unit with a registration means (apparatus). Further, the above-mentioned problems not only increase the amount of defective paper generated, but also cause a significant decrease in productivity in combination with frequent order changes.

In the conventional paperboard feeding device configured as described above, the rising timing of the sheet and the receiving plate that separates the engagement of the delivery roll that is the delivery means of the sheet cannot be changed, and if the sheet size becomes long, the bottom layer Since the lower surface of the rear portion of the sheet comes into contact with and slides on the receiving plate, conveyance resistance increases, which causes a delay in sheet feeding timing. Further, the paper feed deviation amount (a large variation in the paper feed timing) changes each time the load conditions such as the machine speed, the sheet weight (sheet stack height and length), and the sheet material change, and the downstream process such as printing It was necessary for each department to register all the printing colors.

The present invention has been proposed to solve the above conventional problems.

(Means for Solving the Problems) Therefore, the present invention is directed to a delivery roll for sequentially delivering the stacked paperboard from the lowermost layer between the front guide and the backstop, and a lowermost sheet and the delivery roll by raising and lowering the same. In a sheet feeding device configured by a receiving plate that is attached / detached to / from the outer peripheral surface, a first device that arbitrarily sets up / down timing of the receiving plate as an indexing device that adjusts a rotation start timing of a delivery roll. The indexing device and a second indexing device for arbitrarily setting the rotation start timing of the feeding roll, and the first indexing device.
It has a rising cam that can be set at any angle via the indexing device, and a lowering cam that is fixed to the cam drive shaft and rotates at the same timing. ) Is configured so that it can be freely set, and this is a means for solving the problem.

(Operation) After the conveyance by a predetermined angle, the receiving plate is lifted to release the contact between the delivery roll and the lowermost layer sheet, and the delivery roll is decelerated and stopped to stand by in that state. On the other hand, the receiving plate descends after the rotation of the delivery roll is stopped, and stops while the next sheet is in contact with the outer peripheral surface of the delivery roll. Further, the indexing device allows the start timing of the sheet feeding to be freely set forward and backward, and the printing deviation in the downstream process can be corrected. Further, since the action time of the delivery roll can be set according to the sheet length, the increase / decrease variation of the frictional force applied to the lowermost sheet is reduced, and the deviation of the sheet feeding timing is eliminated.

(Embodiment) The present invention will be described below with reference to embodiments of the drawings.
FIG. 3 to FIG. 3 are explanatory views of a schematic configuration and functions of a paperboard feeder according to an embodiment of the present invention installed in a box making machine for corrugated cardboard sheets. In the figure, the paper feed section backstop 1 is configured to move forward and backward on the paper feed table 2 as shown in FIG. 1 and to be fixed at an arbitrary position according to the length of the cardboard sheet 3 to be loaded in the paper feed direction. The corrugated cardboard sheets 3 put in from a preceding process (apparatus) (not shown) come into contact with the front guide 4 and drop, and are sequentially stacked with the backstop 1. A plurality of delivery rolls 5 are provided below the stacked lowermost sheet 3a so as to project slightly above the sheet feeding table 2.

Reference numeral 6 is a suction box, the inside of which is connected to a suction blower 8 via a duct 7. This suction box 6 has an upper suction port (hole) for the lowermost sheet.
It is blocked by 3a and is in a substantially hermetically sealed state, and the suction blower 8 is operated to pull the lowermost sheet 3a downward, thereby increasing the frictional force Fo with the engaging delivery roll 5. On the other hand, on the upper surface of the lowermost sheet 3a, the weight of the sheets stacked above the second stage sheet 3b (direct pressure)
The frictional force F is generated due to the frictional force F, and the lowermost sheet 3a is generated from the gap formed at the lower end of the front guide 4 due to the difference in frictional force generated between the upper surface and the lower surface of the sheet (conveying force f = Fo−F generated in the sheet). The sheet is sent out and is further conveyed to the printing unit P in the next step by holding and rotating the feed rolls 9a and 9b provided on the downstream side.

Reference numeral 10 denotes a receiving plate, and as shown in FIG. 3 (a), the upper peripheral surface of the roll 5 is formed through a plurality of holes formed in a portion corresponding to the group of the delivery rolls 5 arranged in a staggered pattern on the plane. It is supported via a lifting device R so that the relative height position with respect to can be changed. Further, the elevating device R is fixed to the ascending cam 13 and the cam drive shaft that can be set at an arbitrary angle via the indexing device 12 on the cam drive shaft 11 that makes one rotation for one cycle of the sheet feeding operation that is repeated sequentially. It has a lowering cam 14 that rotates at the same timing, and is configured so that the timing for separating the lowermost sheet 3a from the delivery roll 5 (feeding stop operation timing) can be set freely.

Reference numeral 15 is an indexing device for adjusting the rotation start timing of the feed roll 5, and functions to correct and set the initial feeding timing to the front and back via the known transmission 16. Further, an indexing device 1 for arbitrarily setting the rising timing of the receiving plate 10
2. The indexing device 15 for arbitrarily setting the rotation start timing of the feed roll 5 can be manually operated, but the machine speed (theoretical traveling speed of the paperboard), the weight of the paperboard to be stacked (direct pressure), Paperboard material (friction coefficient) Paperboard size (width x
By inputting data such as length) to a predetermined control device C and performing feedback control, it is possible to automatically set a timing that matches the condition.

Next, the control method of the lead edge feeder of the present invention will be described. FIG. 2 is a function (operation timing) explanatory view, and the rotation angle (horizontal axis) θ of the cam drive shaft 11 that makes one rotation per one sheet feeding operation cycle. On the other hand, FIG. 2 (a) shows the raising / lowering timing of the receiving plate 10, and FIG. 2 (b) shows the peripheral speed v of the delivery roll 5 that is intermittently driven to rotate. To briefly explain this, after the receiving plate 10 is lowered, the lowermost sheet 3a is fed out and engaged with the outer peripheral surface of the roll 5, the feeding roll 5 is accelerated and rotated, and the downstream feed roll 9
The leading end of the corrugated cardboard sheet 3 carried out in synchronization with the peripheral speeds of a and 9b is held between the feed rolls 9a and 9b, and the delivery roll 5 is rotated at the same speed for a predetermined time. This reduces the sheet conveying load acting on the feed roll 9.

Next, after conveying by a predetermined angle (length), the receiving plate 10 is raised to release the contact between the delivery roll 5 and the sheet 3a, and the delivery roll 5 is decelerated and stopped to stand by in that state. On the other hand, the receiving plate 10 descends after the rotation of the delivery roll 5 is stopped, and stops while the next sheet 3b is in contact with the outer peripheral surface of the delivery roll 5. After that, the above operations are sequentially repeated, and the stacked sheets are sent out one by one from the lowermost sheet.

Although the basic function of the paper feeding device operates as described above, the following functions are added to the paper feeding device of the present invention. That is, the start timing of the sheet feeding can be freely set forward and backward as shown by the alternate long and short dash line in FIG. 2 (b) by the indexing device 15 provided, and the timing of raising the receiving plate (feeding the paperboard Since the (stop timing) can be freely selected and set as shown by the broken line in FIG. 2A, the positional deviation in the sheet advancing direction in the downstream printing process can be accurately corrected in the paper feeding unit, and a high quality product can be manufactured.

In addition, in the equipped control device, various conditions related to the forward and backward shift of the sheet traveling timing, for example, the above-mentioned machine speed, the weight of the paperboard to be stacked, the data of the paperboard material, etc. are input, and the indexing devices 12 and 15 are set to operate. Since it is possible to correct and maintain the ideal paper feed timing, it is possible to automatically and quickly deal with frequent order changes. Various methods can be considered for the operation timing of each part.

(Effects of the Invention) According to the present invention as described in detail above, the indexing device can arbitrarily set the start (initial rotation) timing of the delivery roll that is the paperboard transporting means, and the printing position in the downstream process. Can be corrected. Also, by adjusting the phase of the receiving plate actuating (elevating) cam, the action time of the delivery roll can be set according to the sheet length, so the fluctuation of the frictional force applied to the lowermost sheet is reduced, and the feeding timing The gap disappears. Machine speed,
Since the load conditions such as the weight of the paperboard, the material of the paperboard and the length of the sheet can be input and the above settings can be made through the control device, the paper feed timing can be automatically controlled. Further, the correction (various settings) of the paper feed timing accompanying the order change can be easily and accurately performed, so that the productivity and the quality can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a lead edge type paper feeding device provided with a paper feed deviation correcting device in a paper feeding device according to an embodiment of the present invention, and FIG. 2 is an explanatory view of the function (operation timing) of the lead edge feeder, FIG. 3 (a) is a plan view showing a schematic configuration of the paper feeder of the present invention, FIG. 3 (b) is a front view thereof, and FIG. 4 is a side view of a conventional lead edge type paper feeder. FIG. 5 is an explanatory diagram of operation timing of the conventional lead edge feeder. Description of main parts of the figure 1 …… Backstop 2 …… Paper feeding table 3 …… Corrugated cardboard sheet (paperboard) 4 …… Front guide 5 …… Sending roll 6 …… Suction box 7 …… Duct 8 …… Suction blower 9 …… Feed roll 10 …… Receiving plate 11 …… Cam drive shaft 12 …… Indexing device 13 …… Rising cam 14 …… Descent cam 15 …… Indexing device 16 …… Transmission device

Claims (2)

[Scope of utility model registration request] 1. A delivery roll that sequentially carries out the paperboard stacked between the front guide and the backstop from the lowermost layer, and by raising and lowering the lowermost sheet and the outer peripheral surface of the delivery roll, engage (contact) each other. In a paper feeding device constituted by a receiving plate to be attached and detached, as an indexing device for adjusting the rotation start timing of a delivery roll, a first indexing device for arbitrarily setting the up-and-down timing of the receiving plate, and a rotation start of the delivery roll. Second to set the timing arbitrarily
A paper feeding device comprising an indexing device. 2. The paper feeding device according to claim 1, further comprising a raising cam that can be set at an arbitrary angle via the first indexing device and a lowering cam that is fixed to a cam drive shaft and rotates at the same timing. A paper feeding device, characterized in that the lowermost paperboard with respect to the holding roll and the feeding roll can be freely set for the timing of releasing (paper feeding stop operation timing).