JPH032059B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention supplies printing paper between a cylinder and a screen plate, and prints on the printing paper by moving the screen plate as the cylinder rotates. The present invention relates to a cylinder-type screen printing machine, and particularly to a paper ejecting device that can smoothly eject printing paper made of cardboard or hard vinyl used in package printing or the like.

(Prior art) Conventionally, when thick printing paper is used in this type of printing machine, the resilience of the printing paper is inferior to that of thin paper, so as shown in Figure 6, the printing paper after printing is The printing paper P is sent out from the cylinder 51 in a curved state, and its front edge hits the guide 53 provided at the starting end of the paper ejection tape 52, preventing it from being smoothly fed to the paper ejection tape 52 side. There were some problems with printing.

(Problems to be Solved by the Invention) The present invention has been made to solve the problem that thick printing paper cannot be smoothly ejected without interfering with printing.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, as shown in FIG. is provided so as to be able to reciprocate almost in a straight line between a gripping position on the cylinder 3 and a release position a predetermined distance away from the gripping position in the carrying-out direction, and the gripping means 25
A braking force is applied to the printing paper P when the gripping means 25 moves forward from the gripping position to the release position, and a braking force is applied to the printing paper P when the gripping means 25 moves back from the release position to the gripping position. A measure was taken to provide feed control means 41 and 46 that apply a feed force to P along the unloading direction.

(Operation) The leading edge of the printing paper P is gripped by a gripping means located at a gripping position on the cylinder, and is led out from the cylinder as the gripping means moves forward. As shown in FIG. 4, when the gripping means moves forward, a braking force is applied to the rear end of the printing paper P by the feed control means, so the printing paper P is held in a substantially flat state without being curved. . And, as shown in Figure 5,
When the gripping means reaches the release position and releases the printing paper P, the leading edge of the printing paper P is smoothly released from the gripping means by the braking force of the feed control means, and the entire paper is placed on the feed control means. In this state, the feed control means applies a feeding force in the carrying-out direction to the printing paper P, and the printing paper P is smoothly carried out toward the outside.

(Example) An example embodying the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 1, a cylinder 3 is rotatably supported by a shaft 2 in a machine frame 1 of a cylinder type screen printing machine. A drive gear 4 fixed on the shaft 2 is meshed with a sector gear 5, which is connected via a connecting rod 6 to a crank lever 8 on a drive shaft 7 driven by a motor (not shown). As the drive shaft 7 rotates, the sector gear 5 swings, thereby causing the cylinder 3 to rotate forward and backward through a predetermined angle in the directions of arrows A and B in FIG.

Above the cylinder 3, a screen plate 9 with a screen 9a stretched thereon is disposed close to it so as to extend horizontally, and when the cylinder 3 is rotated in the direction of arrow A, the screen plate 9 is horizontally moved in the direction of arrow R; Further, when the cylinder 3 is rotated in the direction of arrow B, the screen plate 9 is horizontally moved in the direction of arrow L. A squeegee 10 and a doctor 11 are disposed on the screen plate 9 so that they can be raised and lowered alternately, and when the screen plate 9 moves in the direction of arrow R, the squeegee 10 is pressed against the circumferential surface of the cylinder 3 via the screen 9a, Further, when the screen plate 9 moves in the direction of the arrow L, the doctor 11 is pressed against the circumferential surface of the cylinder 3 via the screen 9a.

On the other hand, an automatic paper feeder 13 is arranged adjacent to one side of the machine frame 1, and a mounting table 16 is provided inside thereof so as to be movable up and down. A large number of sheets of printing paper P made of cardboard, hard vinyl, etc. are supported in a stacked state on the mounting table 16, and each printing paper P is picked up one sheet from the top by a movable suction device (not shown) disposed above. The sheets are taken out one by one and fed between the cylinder 3 and the screen plate 9 via a first sheet feeding tape 14 and a second sheet feeding tape 15, which are respectively provided so as to be rotatable.

Next, to explain the structure of the paper discharging device which is the main part of this invention, as shown in FIGS. 1, 2 and 3, on the left and right sides of the cylinder 3, there is a A pair of drive sprocket wheels 18 are fixed, and a drive chain 21 is provided between both drive sprocket wheels 18 and a pair of driven sprocket wheels 20 on a shaft 19 supported on the other side of the machine frame 1. is hung. A support rod 22 having a U-shaped cross section and extending parallel to the shaft 2 is attached and fixed between the upper parts of the drive chain 21 by mounting plate sections 23 at both ends. A moving shaft 24 is extended. A plurality of gripping claws 25 are fixed at equal intervals on the rotation shaft 24, and the tips of the gripping claws 25 are tilted toward the cylinder 3 side and directed upward through an opening 26 formed in the upper surface of the support rod 22. It stands out.

A pair of left and right guide rails 27 are fixed to the machine frame 1 inside both the mounting plate parts 23 and extend parallel to the lower side of the drive chain 21 on the upper side. The support rod 22 can be slid back and forth with respect to the guide rail 27 through a plurality of pins 28, with vertical movement being restricted. Then, when the drive chain 21 rotates in accordance with the forward and reverse rotation of the cylinder 3, the support rod 22 is connected to the guide rail 27.
, and each gripping claw 25 is moved between a gripping position on the cylinder 3 shown by a chain line in FIG. 2 and a release position a predetermined distance away from the cylinder 3 shown by a solid line in FIG. Ru. Note that a recess 29 is formed in a part of the cylinder 3 into which the support rod 22 and the gripping claw 25 enter.

Further, an engaging rod 31 is disposed below one guide rail 27 and extends parallel to the engaging rod 27, and its front and rear ends are connected to a pair of engaging rods rotatably supported on the machine frame 1 via a shaft 32. It is supported by a lever 33. An arm 34 is fixed to the lever 33 at the front, and the shaft 2 of the cylinder 3 is attached to the tip of the arm 34.
A link 35 operated by a grip claw opening/closing cam (not shown) fixed on the top is connected. On the other hand, an engagement lever 3 is provided on one end of the rotation shaft 24.
6 is fixed so as to protrude obliquely downward, and a contact 37 that comes into contact with the upper surface of the engagement rod 31 is provided at the tip thereof. When the gripping claw 25 reaches the release position, the link 35, arm 34, lever 33
The engagement rod 31 is raised via the contacts 37,
Each gripping claw 25 is connected via the engagement lever 36 and the rotating shaft 24.
will be released. Further, when the gripping claws 25 reach the gripping position, the engaging rod 31 is lowered at the end of the reverse rotation of the cylinder 3, and each of the gripping claws 25 is closed.

Incidentally, reference numeral 38 shown in FIG. 2 is a fixed gripping piece for gripping the front edge of the printing paper P in cooperation with the gripping claws 25. A stopper 39 is supported along the drive chain 21 on the upper side of the machine frame 1 so as to be adjustable in position back and forth, and is designed to restrict the forward movement of the printing paper P released from the gripping claws 25. It's summery.

As shown in FIGS. 1 and 3, a first paper ejection tape 41 constituting a part of the feed control means of this embodiment is placed near the cylinder 3 on the lower side of the movement path of the gripping claw 25. It is arranged in an inclined position with the starting end of the side facing up. This first discharge tape 41 is made by winding a plurality of tapes 44 between a pair of front and rear rotating shafts 42 and 43 extending left and right, and gears 40 on the shaft 2 are attached to both ends of the rotating shaft 42 on the cylinder 3 side. A pair of control gears 45 having a smaller diameter are fixed to mesh with the gears. As the drive gear 4 rotates forward and backward, the control gear 45
The first discharge tape 41 is always rotated in the opposite direction to the cylinder 3, and as shown in FIG. 4, when the cylinder 3 is rotated in the direction of arrow A, the upper tape 44 is rotated in the direction of arrow C. As the gripping claws 25 move forward, a braking force is applied to the rear end of the printing paper P that has passed through the contact point between the cylinder 3 and the screen plate 9 in a direction opposite to the conveyance direction. Further, as shown in FIG. 5, when the cylinder 3 is rotated in the direction of arrow B, the upper tape 4
4 is moved in the direction of arrow D to apply a feeding force along the discharge direction to the rear end of the printing paper P released by the gripping claws 25.

As shown in FIG. 1, on the machine frame 1 below the movement path of the gripping claws 25, a second paper ejection tape 46, which constitutes the other part of the feed control means of this embodiment, extends horizontally back and forth. The starting end is located directly below the ending end of the first discharge tape 41. The second discharge tape 46 is always driven around in the direction of arrow E in the figure by a motor 47 via a transmission mechanism (not shown), and its speed is set faster than that of the first discharge tape 41. Then, it is released from the gripping claw 25 and the second
The printing paper P that has fallen onto the paper discharge tape 46 is carried out to the outside of the machine frame 1 as the second paper discharge tape 46 moves around.

Next, the operation of the paper ejection device configured as above will be explained.

Now, in FIG. 1, the printing paper P taken out from the automatic paper feeder 13 is connected to the first and second paper feed tapes 14,
15 and is supplied between the cylinder 3 and the screen plate 9, and the front edge thereof is gripped by the gripping claws 25 at the gripping position, just before the printing operation starts.

In this state, when the cylinder 3 is rotated in the direction of the arrow A, the screen plate 9 is moved in the direction of the arrow R, the gripping claws 25 are moved forward, the printing paper P is pulled out in a substantially flat state, and the screen plate 9 is moved in the direction of the arrow A. The ink X on the screen 9a is pushed out by the squeegee 10 which is pressed against the cylinder 3 via the squeegee 9a, and predetermined printing is performed on the printing paper P. As shown in FIG. 4, the printing paper P after printing is released from the contact between the cylinder 3 and the screen plate 9 as the gripping claw 25 moves forward, and its rear end falls onto the first paper discharge tape 41 due to its own weight. do. At this time, the first
Since the tape 44 of the discharge tape 41 is being moved in the direction of arrow C in the figure, a braking force is applied to the rear end of the printing paper P, which reduces the rigidity of the printing paper P itself made of cardboard or the like. The resulting curvature is relaxed.

Then, when the gripping claw 25 reaches the release position, the engaging rod 31 is raised, and as shown in FIG.
The gripping claws 25 are released, and the front end of the printing paper P falls onto the second discharge tape 46 with its forward movement being restricted by the stopper 39. By the way, when the printing paper P is released, the braking force is applied to the printing paper P by the first discharge tape 41 until the gripping claws 25 are released, so that the front edge of the printing paper P can be smoothly separated from the gripping claws 25. can be done.

Immediately after the gripping claws 25 are released, the cylinder 3 is rotated in the direction of arrow B in the figure, and as a result, the gripping claws 25 start to move backward, and the first
The circumferential direction of the discharge tape 41 is reversed to the direction of arrow D, and a feeding force along the discharge direction is applied to the rear end of the printing paper P. Therefore, the feeding force of the first paper discharge tape 41 cooperates with the high-speed feeding of the second paper discharge tape 46, so that the printing paper P can be quickly carried out of the machine frame 1. And the gripping claw 25
During the return movement, as the screen plate 9 moves in the direction of the arrow L, the doctor 11 performs ink return on the screen 9a, and the ink X is returned to the printing start position. Further, when the gripping claw 25 is returned to the gripping position, the engaging rod 31 is lowered and the gripping claw 25 is closed, and the front edge of the next printing paper P fed from the automatic paper feeder 13 is gripped. Ru.

It should be noted that the present invention is not limited to the configuration of the embodiment described above, but can also be embodied in other embodiments described in the next section.

(1) In the above embodiment, the paper ejection device was composed of the first paper ejection tape 41 and the second paper ejection tape 46, but this is composed of one paper ejection tape, which is gripped by a motor capable of forward and reverse rotation. Even if the circumferential directions of the paper ejection tape are reversed when the claw 25 moves forward and backward, the control force during the forward movement and the feeding force during the backward movement with respect to the printing paper P will be the same as in the embodiment described above. can be granted.

(2) If an air suction device is provided on the first discharge tape 41 of the embodiment described above, and the air suction device is activated when the gripping claw 25 moves forward to suction the rear end of the printing paper P, a stronger control can be achieved. You can get power. Further, in this case, the driving of the first discharge tape 41 may be stopped when the air suction device is activated.

(3) In the embodiment described above, the first paper ejection tape 41 is rotated in the opposite direction when the gripping claw 25 moves forward. Even if the printing paper P is configured to rotate in the same direction at a low speed,
A braking force can be applied to the rear end of the vehicle.

Effects of the Invention As described in detail above, according to the present invention, a gripping means capable of gripping and releasing the leading edge of the printing paper after printing is arranged at a gripping position on the cylinder and at a predetermined distance away from the gripping position in the conveying direction. The gripping means is provided so as to be movable back and forth in a substantially straight line between the gripping means, and applies a braking force to the printing paper when the gripping means moves forward from the gripping position to the release position at the lower side of the movement path of the gripping means, and Since a feed control means is provided that applies a feeding force to the printing paper along the delivery direction when the gripping means moves back from the release position to the gripping position, the thick printing paper can be guided out of the cylinder in a nearly flat state. Thus, printing defects due to curvature can be avoided, and furthermore, the front edge of the printing paper is reliably separated from the gripping means, and the printing paper can be smoothly carried out, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a front view of a cylinder type screen printing machine showing an embodiment of the present invention, FIG. 2 is a front view of the main part showing the configuration of the gripping means, and FIG. 3 is a plan view of the main part showing the vicinity of the cylinder. FIG. 4, and FIG. 5 are front views of main parts showing different unloading states. FIG. 6 is a front view of main parts of a conventional device. Cylinder...3, Screen plate...9, Gripping claw...25, First paper discharge tape...41 and second paper discharge tape constituting the feed control means...46, Printing paper...P.

Claims (1)

[Claims] 1. A cylinder type screen in which printing paper P is supplied between a cylinder 3 and a screen plate 9, and printing is performed on the printing paper P by moving the screen plate 9 as the cylinder 3 rotates. In the printing press, the gripping means 25 capable of gripping and releasing the front edge of the printing paper P after printing is placed almost in a straight line between the gripping position on the cylinder 3 and the release position a predetermined distance away from the gripping position in the conveyance direction. The gripping means 25 is provided so as to be reciprocally movable at the lower side of the movement path of the gripping means 25, and applies a braking force to the printing paper P when the gripping means 25 moves forward from the gripping position to the release position.
A paper discharging device characterized in that it is provided with feed control means 41 and 46 that apply a feeding force to the printing paper P along the discharge direction when the printing paper P moves back from the release position to the gripping position. 2. The feed control means includes a first discharge tape 41 disposed obliquely close to the cylinder 3;
and a second paper ejection tape 46 connected to the end of the paper ejection tape 41, the upper side of the first paper ejection tape 41 is always moved in the opposite direction to the moving direction of the gripping means 25, and the second paper ejection tape 46 is connected to the end of the paper ejection tape 41. 46
Paper discharge in a cylinder type screen printing machine according to claim 1, wherein the upper side portion is always moved in the same direction as the forward movement direction of the gripping means 25 at a higher speed than the first paper discharge tape. Device.