JPH0248342A - Sheet feeder - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a miss feed by a method wherein a plurality of magnet rolls for suction are located on the under surface of the upper part of a machine body between a pair of conveyance belts, and the under surface of each magnet roll is leveled with the under surface of the horizontal conveyance belt. CONSTITUTION:In a sheet feeder 1, a plurality of magnet rolls 16 rotatable in a conveyance direction are securely situated between a pair of conveyance belts 10 and 10 moved in parallel and are leveled with the under surface of the conveyor belt. Thereby, a sheet 15 is conveyable if the size thereof may be a value higher than a size being large enough to protrude from both sides and allow conveyance of it by means of the conveyance belts 10 and 10. In variation of the shape and the size of the sheet 15, the sheet can be sucked in a similar manner described above and conveyed without special regulation, e.g. a vacuum cup. The conveyance belt 10 of the sheet feeder 1 is moved by one full pitch through rotation of a drive pulley 13, and the sheets 15 are conveyed, in order, from a destack station 3, situated at a pitch P equal to a moving pitch, through idle stations 4 and 5 to a first station 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sheet feeder for intermediately transporting sheets from a distack station to a first station of a transfer press.

Conventional technology (r't) Since then, sheet feeders for intermediately conveying sheets from a distack station to the first station of a transfer press have been used to sandwich the sheet between fingers using the movement of the foot bar of the transfer press. Vacuum J, a sheet feeder with a structure that conveys the sheet by adsorbing it to a cup, is used.

Problems to be Solved by the Invention However, when fingers are used, various types of fingers must be manufactured that match the shape of the seat, and installation and adjustment are time-consuming. Furthermore, when vacuum cups are used, installation of multiple vacuum cups requires adjustment depending on the shape and size of the seat. In addition, the conveyance time of the feed bar of the transfer press is only about 120° during one rotation of the press (<360°), and the sheet must be sucked into the vacuum cup and conveyed within this time. As the SPM of the transfer press increases, its suction conveyance time decreases in inverse proportion.
The conveying operation of the sheet gradually became rapid and impactful, resulting in a problem that many misfeeds occurred.

Means for Solving Point W The present invention is intended to solve the above-mentioned problems, and the details thereof will be explained below with reference to the drawings.

In FIG. 1, the sheet feeder 1 of the present invention has an upper part 7 of the machine body built across the north side of the first station 6 from the distack station 3, and pulley shafts 8.8 are rotated at both ends of the L part 70 of the machine body. A pair of pulleys 9.9 are mounted on both sides of each pulley shaft 8.8 with the fuselage in between.
are arranged side by side, and a pair of pulleys 9.9 are provided between each pair of pulleys at both ends. The transport bells N01IO are hung parallel to each other across the upper part 7 of the machine, and the upper side 11 of each transport bell N0110 stretched between the pulleys 9 and 9 is connected to a pair of drive pulleys arranged in parallel on the same drive shaft 12. 13.13 and drive each conveyor belt at the same time, drive each conveyor belt 10, 10 so that the lower side 14 of the conveyor belt 14 simultaneously moves in the conveyance direction of the sheet 15, and a pair of conveyors that move in parallel. Several magnet rolls 16 for suction are provided on the lower surface of the upper part 7 of the machine body between the 10 and 10, and each magnet roll 16 is arranged rotatably in the conveying direction of the sheet 15. The lower surface of the conveyor belt 16 is aligned with the lower surface of the horizontal conveyor belt IO, and the drive pulley 13 is driven once at a non-uniform speed to move the conveyor belt NO by one pitch at a non-uniform speed. It is characterized by a configuration in which the suctioned sheets 15 are sequentially moved from the distack station 3 to the first station 6 along with the movement of the conveyor belt 10.

In addition, in FIG. 2, the sheet feeder 1 of the present invention has a drive device 17 that independently drives a drive pulley 13 at the top j of the machine body.
and the drive pulley 13 is connected to the output shaft 11 of the drive device 17]
between the input shaft 18 and output shaft I9 of the drive device 17, the gear ratio of the sun gear 21 and the planetary gear 22 is l:1.
The eccentric shaft 23 rotates together with the planetary gear 22, the pin 24 of the eccentric shaft 23 has an eccentricity flQ slightly larger than the radius of the pitch circle of the planetary gear 22, and the pin 24 rotates by the pin 24. By interposing the arm guide member 25, one revolution of the input shaft 18 at a constant speed is changed to one revolution of the output shaft 19 at an inconstant speed.
The conveyor belt No. 3 driven by the conveyor belt NO.
It is characterized by a structure in which the sea) 15 that has been sucked into the air is sequentially moved between each station.

Function: The distack station 3 of the sheet feeder 1 is provided with a known crane saver distack device 26.
It picks up Sea H5 one by one from the pallet 27 and ascends.
The magnetic roll 16 attracts it and delivers it. The sheet feeder 1 includes a pair of conveyor belts 10.10 that move in parallel.
A plurality of magnet rolls 16, which are rotatable in the conveying direction, are fixed in the middle of the conveyor belts at the same height as the lower surface of the conveyor belt.
Large enough to protrude on both sides so that it can be transported by lO゛C
If there is, it can be conveyed, and suction and conveyance can be carried out in the same way without making special adjustments like a vacuum cup in response to changes in the shape and size of the sea H5.

In addition, the conveyor belt 10 of the sheet feeder 1 is connected to the drive pulley 1.
3, the sheet 15 is moved one pitch by one rotation, and the sheet 15 is sequentially conveyed between each station from the distack station 3, which is provided at a pitch P equal to the movement pitch, to the first station 6, via the idle station 4.5. be done. The drive pulley 13 is driven by an independent drive device fR17 without using the movement of the foot bar of the transfer press. The drive device 17 changes the speed of one rotation of the input shaft 18 at a constant speed to one rotation of the output shaft 19 at an inconstant speed through a planetary gear device 20 and the like, and drives the drive pulley 1 connected to the output shaft 19.
3 is driven one rotation at non-uniform speed. The conveyor belt 10 driven by the drive pulley 13 stops closing for a short time at the beginning and end of the movement, and gradually increases or decelerates and moves one pitch at an inconstant speed, thereby conveying the sheet 15 between stations. stabilize and solve problems.

EXAMPLES The present invention will be described in detail below based on examples shown in the drawings.

FIG. 1 is an explanatory diagram of a main part of a sheet feeder 1 according to an embodiment of the present invention, and FIG. 2 is a sectional view of a drive device 17 that drives a drive pulley 10 thereof. The sheet feeder l is installed on the left side of the transfer press 2 by aligning the first station 6 of the machine with the first station of the transfer press 2 (hereinafter, left and right expressions are based on the direction of the drawing), and feeds the sheets 15. The aircraft is transported from the distack station 3 to the first station 6 in the right direction. The upper part of the fuselage is constructed across the above-mentioned stations, and pulley shafts 8.
8 is rotatably supported, and a pair of pulleys 99 are arranged in parallel on both sides of each pulley shaft 8.8, with the fuselage in between. pair of conveyor bells)
10.10 are hung in parallel across the upper part 7 of the fuselage. In addition, the conveyor belt 10 is stretched, and the upper side 1 of lO
1 is a pair of drive pulleys 13 arranged in parallel on the same drive shaft 12
．． 13 to simultaneously drive each conveyor belt 10, 10, and each conveyor belt 10, 10 is driven in one direction so that its lower side moves in the sheet conveyance direction. Further, 26.26 is a tension boot for pulling the conveyor belt. Also, a pair of conveyor belts 1O1 that move in parallel
A plurality of magnet rolls 16 for suction, which are rotatable in the rotational direction, are disposed on the lower surface of the upper part 7 of the machine in the middle of IO, and the height of their lower surfaces is equal to that of the lower surface of the conveyor belt 100 on the lower side 14. Aligned to the same height.

The distack station 3 of the fuselage is provided with a known crane saver distack device 27. A large number of sheets 1 are stored on the pallet 28 installed below the aircraft.
5 is loaded, and the plurality of vacuum cups 29 provided on the upper part 7 of the machine so as to be freely raised and lowered are connected to the conveyor belt IO1!0.
and the magnet roll 16, and attracts the sheets [5] one by one from the pallet 28, and then moves upward and attracts them to the lower surface of the magnet roll 16. Note that the width of the sea H5 to be transported is wider than the width of the magnet roll 1G, and it is necessary that it protrudes to the transport bells N01IO on both sides. The sheet 15 attracted to the transferable magnet roll 16 moves on the lower surface of the roll 16 as the transport bells on both sides move. Two idle stations 4.5 are provided at equal pitches P between the distack station 3 and the first station 6 of the aircraft, and the pitch -j method P between these stations is determined by the drive pulley 13. (conveyor bell when driven one rotation)
The travel distance is at a trough of 10. Further, above the first station 6 of the machine, a known knockout device 3o is provided in order to release the sheet 15 attracted by the magnet roll 16.
Its knockout rod (not shown) that moves up and down between 6 and 6
pushes down the sheet 15 from above and delivers the sheet 15 to the feed bar 31 waiting at the first station of the transfer press 2.

The drive boo 913 is driven by the independently driven drive device 17. The drive device 17 is installed on the upper part of the fuselage, and an output shaft 19 extending from the device to one side is connected to the drive shaft 12 via a coupling 32, 32. A known chain wheel device 34 and a clutch/brake device 35 are coupled to the input shaft 18 which is coaxial with the output shaft 19 and extends to the other side. The rotation of a separately installed motor (not shown) is transmitted to a chain wheel device 34, and a clutch brake device 35 drives the input shaft 18 one rotation intermittently. The input shaft (2) is rotatably fitted into a boss member 37 fixed to the frame 36 of the drive device 17. A disk 39 is fitted and fixed to the shaft end 38 of the input shaft 18 extending into the device,
It rotates together with the input shaft 18. Further, a sun gear 21 is carved on the inner outer periphery of the boss member 37 so as to be concentric with the input shaft 18 . An eccentric shaft 23 is rotatably fitted into a bush 41 fixed at a position eccentric from the center 40 of the disc 39. A planetary gear 22 that meshes with the sun gear 21 is fitted onto the shaft end 42 of the eccentric shaft 23, and the gear ratio between the sun gear 21 and the planetary gear 22 is 1=1. Also, a pin 2 is located at an eccentric position of the arm 43 of the eccentric shaft 23.
4 is provided protrudingly, and a rectangular bush 44 is rotatably fitted into the pin 24. The eccentricity mQ of the pin 24 of the eccentric shaft 23 is set to be slightly larger than the radius of the pitch circle of the planetary gear 22. The output shaft 19 is rotatably fitted to the other boss member 45 of the frame 36, and an arm guide member 25 is attached to the shaft end 46 of the output shaft 19 extending into the device.
are fitted and fixed, and rotate together with the output shaft 19. A long groove 48 is provided in the end surface 47 of the arm guide member 25 in a direction perpendicular to the center, and the rectangular bush 44 of the pin 24 is slidably fitted into the long groove 48. Note that the input shaft 18 rotates once clockwise starting from when the planetary gear 22 is located directly below the sun gear 21. FIG. 3 shows the relative position of the pin 24 of the eccentric shaft 23 and the arm guide member 25 with respect to the planetary gear 22 located directly below. Therefore,
One revolution of the input shaft 19 causes the disk 39 to rotate once, and the planetary gear 22 makes two revolutions: one revolution around the sun gear 21 and one revolution around the axis of the eccentric shaft 23.

The pin 24 of the eccentric shaft 23 per revolution of the input shaft 19
As shown in Figure 4, a→b→C→d→e→f→g −+
41−+ i −+ j →l(−111−$ m→
H-110→p →q →r-+9→t-1- u→■
The arm guide member 25 is rotated by the movement of the pin 24, and the output shaft 19 rotates once. In the motion locus curve of FIG. 4, the movement of the pin 24 hardly rotates the arm guide member 25 near the beginning and end of rotation of the input shaft 18 from 0'' to 10'' and from 350° to 360°, so the output shaft 19 stops rotation. Further, the output shaft 19 gradually speeds up or decelerates before and after the output shaft 19, and rotates once at a non-uniform speed. Drive pulley 1 connected to output shaft 19
3 similarly rotates once, and the conveyor bell NO moves one pitch, but Figure 5 shows the input shaft that rotates once at a constant speed! The moving distance of the conveyor belt 10 with respect to the rotation angle of 8 is shown in a graph diagram. In the figure, the conveyor bell (10) gradually increases or decelerates after a short pause at the beginning and end of its movement, and moves one pitch at an inconstant speed. Further, the frame 7 is provided with a proximity switch 49 for stopping at a fixed position, which detects a detection object 50 fixed on the disc 39, assists in the switching operation of the clutch brake device 35, and operates the input shaft 18 once. Control.

Effect of the invention The present invention has the following various effects.

■ In the sheet feeder of the present invention, it is necessary to replace or adjust the conveyance member according to the shape and size of the sheet, as in the conventional case of conveying the sheet by holding it between fingers or conveying it by suction to a vacuum cup. There is no. The sheet handled by the sheet feeder of the present invention may be large enough that both ends of the sheet protrude above the conveyor belts on both sides so that the sheet can be conveyed by the conveyor belts on both sides of the magnet roll.

■ The drive device for the conveyor belt is driven independently to provide sufficient margin for the timing of conveyance, and the conveyor belt gradually increases or decelerates after a short pause at the beginning and end of its movement. Because it moves in pitch, there is no impact at the beginning and end of conveyance, which stabilizes conveyance and prevents misfeeds.

(2) An error in one-pitch movement of the conveyor belt caused by variation in the rotation of the input shaft or output shaft of the drive device can be easily corrected by the pause time provided at the beginning and end of the conveyor belt's movement.

(2) As mentioned above, the drive device of the present invention has a simple structure and does not require high costs like a servo drive.

■ In the present invention, the drive pulley is rotated once to move the y11 conveyor belt by one pitch, and the movement dimension of the conveyor belt per pitch is matched to the distance between the stations, so the conveyor belt moves from the distance between the stations. Changes in dimensions can be easily accommodated by simply changing the diameter of the drive pulley.

- 2 in Fig. 2 to show the relative position with the guide member
Figure 4 is a partial cross-sectional view taken along line 2, and Figure 4 is a motion locus curve of the pin of the eccentric shaft per revolution of the input shaft when the eccentricity of the pin of the eccentric shaft is set to be slightly larger than the radius of the pitch circle of the planetary gear. FIG. 5 is a graph diagram showing the relationship between the rotation angle of the input shaft and the moving distance of the conveyor belt.

In the figure, l is a sheet feeder, 3 is a distack station, 6 is a first station, 7 is an upper part of the machine, 8 is a pulley, 10 is a conveyor belt, 13 is a drive pulley, I5 is a sheet, 16 is a magnetic call, and I7 is Drive i-5 position, 1
8 is an input shaft, 19 is an output shaft, 20 is a planetary gear device, 21
is a sun gear, 22 is a planetary gear, 23 is an eccentric shaft, 24
25 is a pin, and 25 is an arm guide member.

[Brief explanation of the drawing]

Fig. 1 is a front explanatory view of a sheet feeder according to an embodiment of the present invention, Fig. 2 is a sectional view of a drive device that drives a conveyor belt, and Fig. 3 is a pin and a pin of an eccentric shaft. Patent attorney
Toshio Komagii Procedural Amendment (Method) % Formula % 2. Name of the invention Sheet feeder 3.2 Ili Positive Zuro Shuttle 5. Date of amendment order (Shipping port) July 4, 1999 6. Drawings subject to amendment (All figures) 7. Contents of amendments No changes to the contents listed in the engraving appendix) Name: Hisanori Hidaka

Claims (2)

[Claims] (1) In the sheet feeder that conveys sheets from the de-stacking station to the first station of the transfer press, pulley shafts are rotatably supported at both ends of the upper part of the machine that spans above both stations, and each A pair of pulleys are installed in parallel on both sides of the pulley shaft, and one pair at each end
A pair of conveyor belts are stretched parallel to each other across the upper part of the machine between the pair of pulleys, and the upper side of each conveyor belt is stretched over a pair of drive pulleys installed in parallel on the same drive shaft to drive them simultaneously. The lower side of each conveyor belt is driven to move in the conveyance direction, and a plurality of magnet rolls for suction are rotatably arranged in the conveyance direction on the lower surface of the upper part of the machine between the pair of conveyor belts that move in parallel. The bottom surface of each magnet roll is aligned with the height of the bottom surface of the horizontal conveyor belt, and the drive pulley is driven once at a non-uniform speed to move the conveyor belt one pitch at a non-uniform speed. A sheet feeder characterized by a structure in which sheets suctioned by a conveyor belt are sequentially moved from a destack station to a first station as a conveyor belt moves. (2) A planetary gear device in which the drive pulley is connected to the output shaft of a drive device that drives independently, and the gear ratio of the sun gear and the planet gear is 1:1 between the input shaft and the output shaft of the drive device. By interposing an eccentric shaft that rotates together with the gear, a pin of the eccentric shaft that has an eccentricity slightly larger than the radius of the pitch circle of the planetary gear, and an arm guide member that is rotated by the pin, the constant velocity of the input shaft is The rotation speed is changed to one rotation at an inconstant speed of the output shaft, and the conveyor belt driven by the drive pulley pauses for a short time at the beginning and end of its movement,
2. The sheet feeder according to claim 1, wherein the sheet feeder is configured such that the speed is gradually increased or decreased before and after the magnetic roll, and the sheet is sequentially moved by moving one pitch at an inconstant speed to sequentially move the sheet attracted by the magnetic roll.