JP2936466B2 - Screen peeling device in flat screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen peeling device in a flat screen printing machine.

In textile printing in a flat screen printing machine, a printing paste is extruded through a screen with a squeegee, and penetrates into a cloth to be dyed. For this purpose, it is necessary to press the squeegee against the screen on the cloth to be squeegeeed until the tip of the squeegee is slightly curved.

For this reason, when squeezing is completed, the screen is stuck to the surface of the cloth to be dyed due to the viscosity of the printing paste. Thus, before the next squeegee, the screen must be peeled from the fabric to be dyed.

[0004]

2. Description of the Related Art Conventionally, in order to peel a screen from a cloth to be dyed, it is general to carry out this according to the following specifications.

After completion of the squeegee, the frame on which the I-screen is stretched, that is, the screen frame is gradually raised one side at a time alternately with respect to the front and rear ends, or one of the front and rear ends of the II screen frame is lifted, or III. After raising the squeegee on the traveling end side, the end of the screen frame on that side is raised, and then the other end is raised.

[0006] In each of these methods, the screen frame is inclined in the above-described manner, and the screen is separated from the cloth under the inclination. The reason for setting the screen frame to the inclined position is to allow the screen to separate from the cloth in a small area and to prevent the screen from bouncing off the cloth against the viscosity of the printing paste.
If the screen jumps, the printing paste remaining on the screen mesh scatters on the cloth surface, and the finished printing cloth becomes defective.

[0007] In order to obtain a sufficiently satisfactory result in the above-mentioned conventional method for avoiding the scattering of the printing paste, it is necessary to raise the above-mentioned inclination of the screen frame considerably slowly, so that the efficiency in the printing cycle is considerably high. Forced to fall. In the past, although some printing failures occurred, in order to give priority to efficiency, the screen frame was lifted at a speed commensurate with the efficiency to peel off the screen.

Conventionally, the screen frame is raised and lowered by a screen frame, a member supporting the screen frame, a squeegee, a squeegee carrier, a motor for running the squeegee, a transmission mechanism for transmitting the operation of the motor to the squeegee carrier, and a guide rail for running the squeegee carrier. And the like are assembled into one assembly to form a printing unit, and the printing unit is moved up and down. In this prior art, the printing unit is relatively heavy and has a complicated structure as a whole, and a large-scale and complicated structure is required for a device for moving the printing unit up and down.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen peeling apparatus for a flat screen printing machine which can obtain a sufficiently good printing result without lowering the efficiency in a printing cycle.

Another object of the present invention is to make it possible to raise and lower a screen frame with a small-scale and simple lifting device.

Further, according to the present invention, the screen frame is raised by an optimum amount corresponding to the printing working width (printing area in the squeegee running direction), and peeling of the screen is started at an optimum timing corresponding to the set squeegee running speed. The aim is to make it possible to raise the screen frame on both the squeegee starting side and the opposite side by the required minimum amount, and to achieve complete peeling of the screen purposefully.

[0012]

The features of the screen peeling apparatus of the present invention are as follows. (1) The operating side and the non-operating side of the flat screen printing machine are separately driven on the printing machine frame by lifting means. A lifting member is provided, and the operation side lifting member and the screen frame end on the same side are substantially connected to each other, and the counter-operation side lifting member and the screen frame end on the same side are respectively connected to each other. Is characterized in that the screen frame support is allowed to rotate about an axis perpendicular to the squeegee running direction, and a squeegee is provided on the squeegee carrier and can move up and down with respect to the carrier.

Another feature of the screen peeling apparatus according to the present invention is that (2) an elevating member which is individually driven by elevating means on the printing machine frame on the operation side and the non-operation side of the flat screen printing machine. Substantially, the operation side elevating member and the screen frame end on the same side are coupled together, and the non-operation side elevating member and the screen frame end on the same side are coupled, respectively, and the coupling is performed with the squeegee traveling direction. The squeegee is attached to a support member mounted on a squeegee carrier and raised and lowered by an elevator, so as to allow the screen frame support to rotate about an orthogonal axis.

Another feature of the screen peeling device of the present invention is that
(3) On the operating side and the non-operating side of the flat screen printing machine, the printing machine frame is equipped with elevating members individually driven by elevating means, and is substantially the same as the elevating member on the operating side. The screen frame end on the side of the squeegee and the screen frame end on the opposite side are connected to the lifting / lowering member on the non-operation side and the screen frame end on the same side. Not to forgive,
A squeegee is provided on the squeegee carrier in front of and behind the direction of travel of the carrier, the squeegee carrier being at one and the other stroke ends, the required squeegee being located at the squeegee position, and the other squeegee being located at the squeegee position. When the squeegee carrier reaches both of the stroke ends and stops when the squeegee carrier reaches the standby position, the screen frame is opposite to the stopped side. The end is
The opposite means is that the ascending / descending means descends from the waiting position at the ascending limit to slightly before the descending limit position corresponding to the squeegee position, stops, and then descends to the descending limit position.

Another feature of the present invention is that in the screen peeling device having any one of the above constitutions (1) to (3),
The screen frame is characterized in that the start of ascent for releasing the screen from the cloth to be dyed is controlled by a signal or a timer of an amount corresponding to the operation amount of the squeegee carrier traveling motor.

In the present specification, in the present specification, "the operating side and the non-operating side of the printing machine" mean "one end side and the other end side" in the squeegee traveling direction. The same is true for the claims.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 9 show one embodiment according to the present invention, FIGS. 10 and 11 show another embodiment, and FIGS.
Reference numerals 0 and 11 represent parts different from the former embodiment. This latter embodiment has the same configuration as that of the former embodiment except for the configuration shown in FIGS. 10 and 11, that is, the latter embodiment has a squeegee and a squeegee instead of a squeegee and a scraper. The configuration is substantially the same as that of the former embodiment. Accordingly, the disclosure of the drawings corresponding to FIGS. 1 to 3 and FIGS. 5 to 8 in the latter embodiment is omitted.

The illustrated embodiment of the invention is for an automatic flat screen printing machine.

The printing machine 1 includes a screen frame elevating system S
The general configuration is the same as the conventional one except for the above. The entire printing machine 1 is shown in FIGS.

In FIGS. 1 and 2, reference numeral 2 denotes a starting end roller of the endless belt 4 for conveying the cloth 7 to be dyed, 3 denotes an end roller of the belt 4, 5A denotes a motor for intermittently rotating the roller 2, 5B
Is a motor for intermittently rotating the roller 3, and 6 is a printing table.

The printing machine 1 has a printing unit 10 mounted on the printing machine frame 1-1 at a constant interval P. Details of the printing unit 10 are shown in FIG. 3 (plan view).

In each printing unit 10, the screen frame lifting / lowering system S has the following configuration (see FIGS. 4 to 8).

The frame on which the screen 118 is stretched, that is, the screen frame 118A, is generally a pair of screen frame supports which extend in the width direction of the belt 4 and are arranged in parallel in the length direction of the belt 4. Bars 117, 117 and support mechanism 3
0, it is mounted on the following rail 208 on the machine frame 1-1. The details of the body structure are as follows.

The support mechanism 30 includes the support bars 117, 1
Squeegee carrier guide rail 1 extending along
Brackets 11 attached to both ends of 09 and 109
5, 115, 115, 115, an elevating member 301 slidable up and down on the bracket 115, and a bracket 305 coupled to the elevating member 301. Bracket 30
5 on which the endless belt 4 is rotated manually.
A screw 306 for adjusting the clearance between the carrier part of the lens and the screen 118 facing the same.
The support bar 117 is suspended from the support member 307 coupled to the lower end through clevis-type connecting members 116 attached to both ends of the support bar 117. The support member 307 and the clevis-type connecting member 116 are pivotally connected by a pin 308 whose axis is oriented in a direction perpendicular to the direction in which the squeegee 114A travels.

In this way, the lifting members 301, 301 on the operation side of the printing press (the right side in FIG. 2 and the lower side in FIG. 3) and the end of the screen frame 118A on the same side substantially move up and down on the opposite side of the printing machine. The members 301 and 301 are connected to the same side end of the screen frame 118A, and the connection is made by the squeegee 114.
It is rotatable around an axis perpendicular to the A traveling direction.

The support mechanism 30 includes a roller 304 that is rotatably fitted on a rail 208 extending in the longitudinal direction of the printing machine frame 1-1, and the roller 304 includes a bracket 302 coupled to an elevating member 301. Are pivotally connected by a shaft 303. This structure can be applied to the printing machine unit 1 if necessary.
0, that is, the parallel interval of the screen 118 can be changed.

The rail 208, in other words, the drive unit 20 as a means or device for raising and lowering the screen frame 118A is disposed on the printing machine operating side and the non-operating side of the machine frame 1-1.

The screen frame lifting / lowering drive device 20 on the operation side and the non-operation side of the printing press has a drive unit 201. Drive unit 2
01 may be assigned to a hydraulic cylinder or an air cylinder. The drive unit 201 is of a double rod cylinder type, and its rods 201A, 201A extend in parallel with the rail 208, and the rods 201A, 201A have rails 208, respectively.
A bar 204 extending in parallel with is connected. Bar 20
4 is movable in the length direction, and the movement is
-2 is guided by the upper guide roller 205. Bar 2
Reference numeral 04 extends over a range corresponding to the entire length of the printing area L of the printing machine.

Bell crank 207 rotatable in a vertical plane
Are mounted on the machine frame pillars 1-2 on the operation side and the non-operation side of the printing press. A vertical rod 206 extending vertically is mounted on the pillar 1-2. The lifting rod 206 is linked to the bar 204 via a bell crank 207. Specifically, one end of the arm of the bell crank 207 is linked to the elevating rod 206 by a roller at the end of the arm and a guide groove on the elevating rod 206 into which the roller fits, and the other end of the arm is The rollers are linked by guide grooves on a bar 204 into which the rollers fit. In the illustrated example, these guide grooves are filled with opposing spaces between the rollers R. Lifting rod 206
The upper end of the mounting seat 2 is fixed to the lower surface of the rail 208.
06A is bound.

Driving device 2 of screen frame raising / lowering driving device 20
When the bar 204 is driven to the right in FIG.
06 is raised and the bar 204 is driven leftward, whereby the lifting rod 206 is lowered using the bell crank 207 as a working medium.

When the lifting rod 206 moves up and down, the rail 2
08 also moves up and down, and accordingly the screen frame 118A moves up and down.

As described above, the bars 204 on the operation side and the non-operation side of the printing machine extend over the range corresponding to the entire length of the printing area L of the printing machine. The frame 118A can be individually raised and lowered at both ends thereof. The lifting and lowering are performed all at once on the screen frames 118A arranged in the printing area L.

The squeegee 114A and the scraper 114B or the squeegees 114A and 114A '
On the squeegee carriers 110, 110 on 09, 109,
It is provided to be able to move up and down. The details are as follows.

As shown in FIGS. 4 and 10, the squeegee carrier 110 is lifted and lowered on the carrier by an elevator 132 on the carrier, for example, an actuator such as an air cylinder, and accompanying the lifting and lowering of the member 128. It has support members 130 and 130 'which are raised and lowered.
The elevating member 128 is connected to a plunger 132A of the elevator 132. Elevating member 128, supporting members 130,1
30 'is guided up and down by guide means such as a sliding groove formed in the squeegee carrier 110. Support member 1
30 is a bracket 1 on which a squeegee 114A is attached.
13 and the scraper 11 is attached to the support member 130 '.
The bracket 113 'to which the 4B is attached or the bracket 113' to which another squeegee 114A 'is attached are connected.

The support members 130, 130 'are
Separately from the lifting and lowering at 28, as will be described later, when one is lifted up and the other is pushed down.

The support member 130 with the above-mentioned rack 131,
A support member 130 'with a rack 131', a bifurcated arm 126, a pinion 129, and a rod 121 with a roller 125 (to be referred to as a control system C for convenience) can lift one of the squeegee 114A and the scraper 114B. When pushing down the other, or squeegee 114A, 1
When one of the squeegees 14A 'is lifted and the other is pushed down, the squeegee is mounted on the squeegee carrier 110 in the front and rear direction of the carrier. Vertical position control means for

The vertical position control means for the squeegee may be of any other suitable type, for example, having the following configuration, instead of the illustrated embodiment.

The squeegee 114A, the scraper 114B or the squeegee 114A 'is in a neutral state which is not located at a lower limit or a lower limit, which will be described later. 4 and 10, the reversal amount of the lifting and the pushing down is set to be larger than that in the forms of FIGS. In this way, the gap between the lower end of the squeegee and the scraper with respect to the screen 118 at the time of neutrality serves as a space for raising the screen frame end on the printing press operation side. (Slight lifting is sufficient, unlike the non-operating side) can be performed without any trouble without using the elevator 132, so that the control system C described above can also serve as the vertical position control means for the squeegee attached.

The squeegee carriers 110, 110 are moved upward and downward in FIG. 3 via transmission mechanisms 106, 108, 106, 108 by forward and reverse rotations of the spindle 102 driven by the motor 105. As the squeegee carriers 110, 110 travel, the squeegee 114A, the scraper 114B, or the squeegee 114A 'travels.

When the squeegee 114A, the scraper 114B or the squeegee 114A 'travels in one direction, the scraper 114B smoothes the printing paste on the screen 118 so that one of the squeegees 114A or 114A' performs the required operation. Screen 118
Is pressed down so as to be pressed against the other, and the other is lifted. This pressing and lifting can be performed by a mechanism as disclosed in Japanese Patent Publication No. 59-38112, for example, according to the inventor's earlier invention.

Specifically, the squeegee carrier 110 is
A forked arm 126 that can be turned forward and backward in a vertical plane on the elevating member 128 and a rod 121 that is attached to a rod 121 that can be slid on the squeegee carrier 110 in the running direction of the squeegee carrier. Roller 125 fitted between the shaft and the shaft 1 that rotates integrally with the forked arm 126
27, a pinion 129 fixed to the
The racks 131 and 13 that mesh with this so as to sandwich the
1 'is formed on the support members 130, 130'. The rod 121 is interposed and connected in the middle of the transmission mechanism 108. Both ends of the rod 121 have a contact surface 1
23, 123 'are provided on the squeegee carrier 110.
4, 124 'are formed respectively.

The squeegee 114A, the scraper 114B, or the squeegee 114A 'is in a neutral state (FIG. 4 or FIG. 10) which is not located at the lower limit or the upper limit.
In the neutral state, there is a distance D between the contact surfaces 123 and 124 and between the contact surfaces 123 'and 124', respectively.

When the motor 105 rotates forward, the transmission mechanism 10
8 is pulled to the left in FIGS. 4 and 10, the rod 121 slides to the left, the right contact surface 123 contacts the contact surface 124, and the squeegee carrier 110 travels to the left. At the start of the traveling, the forked arm 126 is rotated clockwise in FIG. 4 through the roller 125 by the leftward movement of the rod 121, and the pinion 129 is rotated via the shaft 127 by this rotation. The support member 130 is pushed down by the pinion 129 and the support member 130 'is lifted, so that the squeegee 114A
And the squeegee 114B or the squeegee 1
14A 'has been lifted.

When the motor 105 rotates in the reverse direction, the squeegee carrier 110 runs to the right in FIGS. In this case, the scraper 114B or the squeegee 114A 'is pushed down, and the squeegee 114A is lifted. In this rightward traveling, the scraper 114B or the squeegee 11
4A 'operates.

In either direction, when the squeegee carrier 110 stops at the stroke end, the motor 121 reverses and the rod 121 simultaneously moves the squeegee 114A, scraper 114B or squeegee 114.
It is pulled back until A 'is in the neutral state (FIGS. 4 and 10). The quantitative control of the pullback may be performed by counting the number of pulses transmitted from the pulse transmitter 105A in accordance with the amount of rotation of the motor 105 and performing the control based on the number. Alternatively, a quantitative control of the retraction of the rod 121 may be performed by a timer.

As described above, the screen frame 118A is rotatable around its axis perpendicular to the squeegee running direction, so that the ends on the operation side and the non-operation side of the printing press can be rotated. It is movable. This leads to the following:

Simultaneously with or slightly after the start of the squeegee operation of the squeegee 114A or 114A ', the squeegee travels while the squeegee is in contact with the screen 118 while the squeegee is in contact with the screen 118. Side (for convenience, the printing machine is opposite to the operation side, hereafter referred to as the anti-operation side).
The screen 118 can be peeled from the cloth 7.

According to the peeling of the specification, the squeegee 114A or 114A 'is close to the frame side of the screen frame 118A on the non-operation side, and the screen 118
Peeling off begins. For this reason, the initial peeling of the screen is
Due to the squeegee approaching the non-operation side frame side of the screen frame, the squeegee is formed with a steep gradient over a length considerably shorter than the conventional method, in other words, with little effect of the screen tension. .

Therefore, unlike the prior art, the screen is prevented from bouncing at the moment of peeling off the cloth.
The screen, which has started peeling without bouncing, is smoothly peeled off from the cloth by continuing to raise the screen frame in parallel with squeezing. For this reason, in the present invention, even if the screen frame is raised at such a speed that the efficiency does not decrease in the printing cycle, the printing paste does not splash, and a sufficiently good printing result can be obtained.

In the present invention, when the screen frame 118A is lifted for the peeling, it is preferable to detect the operation amount of the driving device 20 as a means for raising and lowering the screen frame 118A. For that, a linear displacement sensor 2 such as a potentiometer
11 can be adopted. The linear displacement sensor 211 is attached to a fixed body, for example, a machine frame 1-1, and a movable rod 211A of the sensor 211 is connected to a member actuated by the driving device 201, for example, a rod 204.

When detecting the operation amount of the driving device 20,
The following points can be contributed.

In flat screen printing, there is a printing area in the vertical direction in FIG. 3, which is referred to as a printing working width, and the printing area has various degrees. On the other hand, it is obvious that there is an optimum amount of elevation of the screen frame for peeling the screen, which corresponds to the printing width.

When detecting the operation amount of the driving device 20,
Based on this, the elevation of the screen frame can be controlled to an optimum amount corresponding to the printing working width. The control is variable according to various printing working widths.

In the prior art, the rising amount of the screen frame for peeling the screen is constant. For this reason, there is a disadvantage that the screen peeling is insufficient even when the screen frame reaches the upper limit, or that the screen frame continues to rise even after the screen peeling ends.

In order to more accurately avoid the screen bouncing at the time of peeling, it is necessary to raise the screen frame end at the time corresponding to the set squeegee traveling speed.

As described above, if the start of raising the screen frame end is controlled by a signal or a timer corresponding to the amount of rotation of the motor for moving the squeegee carrier, the set squeegee traveling speed is reduced. The peeling of the screen can be started at a correspondingly optimal time, and this can be changed for various different set squeegee running speeds. If the screen peeling starts at the optimal timing corresponding to the squeegee running speed, there is no time loss in the flow of a series of processes from squeegee to screen peeling,
Improves the printing cycle. In addition, in the present invention, since the screen peeling can be started at the same time as or slightly after the squeegee running, the printing cycle can be greatly improved.

Conventionally, the required side edge of the screen frame is started to rise at the squeegee end signal irrespective of the squeegee traveling speed. Therefore, it is not possible to perform the screen peeling at the optimum timing for the printing working widths having different degrees.

It is obvious that the optimum amount of the screen frame to be lifted on the opposite side of the screen squeegee running side may be smaller than that on the departure side.

In the present invention, the end of the screen frame can be moved up and down separately on the opposite side to the operation side and the opposite side (the operation side of the printing machine frame in the illustrated embodiment, which is hereinafter referred to as the operation side for convenience). Therefore, when the rising start time of the screen frame end is variable as described above, the screen frame can be raised by a required minimum amount on both sides to achieve screen peeling, and the intermittent cloth to be dyed by the endless belt can be interposed. The screen peeling corresponding to the feed can be repeated without any time loss.

In contrast to this, in the prior art, the screen frame has been raised on both the operating side and the non-operating side to a height corresponding to a later-described maximum ascent of the screen frame end on the non-operating side according to the present invention. There is a considerable time loss in repetition of screen peeling corresponding to intermittent feeding.

In the present invention, the squeegee (or the scraper when the squeegee and the scraper are provided) can move up and down independently of moving up and down to the operating position and the non-operating position. Complete lifting of the screen from the fabric is achieved without tension on the screen, as it can be lifted against the screen and lifted off the squeegee (or even the scraper) when raised. It can be achieved for a purpose.

In the present invention, a lifting member (which corresponds to the member 301 in the illustrated embodiment) is separately driven by the drive unit 20 on the printing machine frame 1-1 at the operation side and the non-operation side end. The operation-side elevating member is substantially connected to the same end of the screen frame, and the non-operation-side elevating member is connected to the same screen frame end.

In this configuration, the assembly of the screen frame and a member for supporting the screen frame, that is, a support (corresponding to the support bar 117 in the illustrated embodiment) comprises a squeegee carrier drive motor 105, a cover 101, a spindle 102, a transmission Mechanisms 106, 107, 108, and their covers 103, 1
04, which means that the squeegee carrier guide rail 109 and the like as a whole are structured to be lifted while being structurally separated from the heavy printing unit element. For this reason, a small-sized screen frame raising / lowering device can be used to easily raise and lower the screen frame in terms of equipment.

In the embodiment shown in FIG. 4, the steps of starting the squeezing, ending the squeezing, and starting the scraper operation are performed in the order of FIGS. 9 (A), 9 (B) and 9
(C). 9 and 10, reference numeral 50 denotes a printing paste.

In the embodiment shown in FIG. 10, a squeezing start stage, a squeezing end stage, and a squeezing start stage from the squeezing end stage are sequentially shown in FIG.
(A), FIG. 11 (B), and FIG. 11 (C). When the squeegee ends and the squeegee or scraper (or another squeegee) reaches the stroke end on the operation side [FIG. 9 (B) or FIG. 11 (B)], the screen frame 118A
Has reached the maximum ascending position.

When this step is reached, in any of the embodiments of FIGS. 4 and 10, immediately the lower end of the screen frame 118A on the non-operation side starts to descend, and the screen 118 is positioned at a level slightly before the cloth. It is preferable that the operation side end of the screen frame 118A is temporarily stopped at an intermediate position having a height corresponding to the above, and at the same time, the operation side end of the screen frame 118A is raised to a height substantially corresponding to the intermediate stop position.

In this manner, the time required for lowering the screen frame for the next squeezing can be shortened, and the printing cycle can be improved, as compared with the related art. In this case, by starting the feeding of the endless belt 4 following the end of the rising of the screen frame end on the operation side, the feeding of the endless belt 4 is moved to the intermediate position of the screen frame end on the non-operating side until the feeding of the belt 4 is completed. Can be lowered.

Further, the lowering of the required side of the screen frame end required for the next squeezing to the lower limit is sufficient only by lowering from the intermediate position. Unlike the case of lowering, the air does not embrace the lower surface of the screen, and the swelling of the screen surface by the entrapped air on the lower surface of the screen immediately after the end of the lowering of the screen frame to the lower limit, even if squeezing is performed immediately and at a high speed. Alternatively, squeezing can be performed without causing a screen surface waving phenomenon due to squeezing. Immediately, the printing cycle can be further improved.

The above-described control for the upper limit of the end of the screen frame on the non-operation side and the intermediate stop can be performed by, for example, a method using a proximity switch. An example of this is
As shown in FIG. In FIG. 5, the proximity switch 209B is for determining the upper limit of the screen frame end on the non-operation side, and the proximity switch 209C is for determining the intermediate stop of the frame end. In FIG. 5, reference numeral 209A denotes a proximity switch for determining a lower limit of the end of the frame, and 209D denotes a proximity switch for lowering / decreasing control of the end of the frame. This descent deceleration may be normally performed at the time point when the total descent amount is reduced by about 1/3.

These proximity switches are mounted at fixed positions on the machine frame 1-1, and the proximity piece 210A for the proximity switch 209A, the proximity piece 210B for the proximity switch 209B,
The proximity piece 210C for the proximity switch 209C and the proximity piece 210D for the proximity switch 209D are attached to fixed positions on the bar 204.

The control for limiting the end of the screen frame on the operation side to the upper limit and the lower limit can be performed, for example, by a proximity switch. In this specific example, there is essentially no difference from the example of the embodiment shown in FIG. 5 with respect to the control of the upper limit and the lower limit of the screen frame end on the non-operation side. Therefore, an example of the mode of controlling the ascending limit and the descending limit of the screen frame end on the operation side is omitted in the drawing. Since the maximum rise amount of the screen frame edge on the operation side is small as described above,
Intermediate stop and descent deceleration are unnecessary.

It is not always necessary to raise the end of the screen frame on the operation side. If the end of the screen frame on the non-operation side is raised to the upper limit by an optimum amount corresponding to the printing working width, when the tension of the screen stretched on the screen frame is normally necessary, This is because the screen in the screen frame on the operation side is separated from the cloth to such an extent that it does not hinder the feeding of the cloth on the endless belt by the ascent. Although the squeegee is pressed against the screen during the squeezing process, the screen at the inner edge of the screen frame on the operation side is usually slightly separated from the cloth on the endless belt.

In this case, the squeegee (scraper or scraper if one more squeegee is provided, also the other squeegee) is at the appropriate time prior to the cloth feeding.
For example, when the squeegee carrier 110 reaches the stroke end on the operation side and the squeegee becomes neutral, it goes without saying that the squeegee carrier 110 is lifted up and separated from the screen.

[0075]

As is evident from the above description, the present invention achieves a satisfactory printing result without a decrease in efficiency in the printing cycle, and achieves the elevating and lowering of the screen frame by a small-scale and simple lifting device. To achieve the task solution.

The present invention also provides a method of raising the screen frame by an optimum amount corresponding to the printing width, starting the peeling of the screen at an optimum timing corresponding to the set squeegee running speed, and determining the starting side of the squeegee running and its It is possible to achieve a minimum required raising of the screen frame on both sides and a complete peeling of the screen in a purposeful manner.

[Brief description of the drawings]

FIG. 1 is a plan view showing an overall outline of a printing machine according to the present invention.

FIG. 2 shows a plan view of the printing machine of FIG.

FIG. 3 is an enlarged plan view of a printing unit in the printing machine of FIG. 1;

FIG. 4 is a detailed view of a lifting / lowering structure of a squeegee and a scraper.

FIG. 5 is a front view of a screen frame lifting / lowering system according to the present invention.

FIG. 6 shows a side view of a screen frame support mechanism in the same system.

FIG. 7 shows a plan view of FIG. 6;

8 is a sectional view taken along line VIII-VIII in FIG.

9 (A) is an elevational view showing a state where squeezing is started, FIG. 9 (B) is an elevational view showing a state where squeezing is completed, and FIG. 9 (C) is a state where operation of the scraper is started. FIG.

FIG. 10 shows a detailed view of a lifting and pushing structure for a squeegee of an embodiment different from that shown in FIGS. 1 to 9;

FIG. 11A is an elevation view of a state in which squeezing in one direction is started in the embodiment shown in FIG. 10;
(B) is an elevational view showing the end state of the squeezing, and FIG. 11 (C) is an elevational view of the squeezing start state in the opposite direction following the end of the squeezing.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 printing machine 1-1 printing machine frame 1-2 pillar 110 squeegee carrier 114A, 114A 'squeegee 117 screen frame support bar 118 screen 118A screen frame 20 screen frame lifting / lowering drive device (screen frame lifting / lowering means) 201 Driving machine 204 Bar 206 Lifting rod 208 Lifting rail 30 Screen frame support mechanism 301 Lifting member of the same mechanism 302 Bracket 304 Roller 121, 125, 126, 129, 131, 131 ',
128, 132 squeegee vertical position control means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B41F 15/34-15/36 B41F 15/08 301 B41F 15/40-15/42

Claims (4)

(57) [Claims] 1. A lifting device which is individually driven by lifting means on the printing machine frame on the operation side and the non-operation side of the flat screen printing machine, and the lifting member on the operation side is substantially provided. and ipsilateral screen frame end and, also the with the side opposite the operation side of the lifting member and the same side of the screen frame end coupling each peripheral Rie screen frame support axis the binding perpendicular to the squeegee direction of travel The squeegee carrier is provided with a squeegee that can move up and down with respect to the carrier, and a screen for peeling the screen is provided .
When the screen frame is raised, the means to raise the screen frame edge is activated
A screen peeling device in a flat screen printing machine, wherein the amount is detected . 2. A lifting and lowering member which is individually driven by lifting and lowering means on the printing machine frame on the operating side and the non-operating side of the flat screen printing machine, and the lifting and lowering member on the operation side is substantially provided. and ipsilateral screen frame end and, also the with the side opposite the operation side of the lifting member and the same side of the screen frame end coupling each peripheral Rie screen frame support axis the binding perpendicular to the squeegee direction of travel The squeegee is attached to the support member mounted on the squeegee carrier and raised and lowered by the elevator , and the screen is peeled off.
When the screen frame rises, raise the screen frame edge
A screen peeling device in a flat screen printing machine, wherein the actuating means detects an operation amount . 3. A lifting device which is independently driven by lifting means on the printing machine frame on the operation side and the non-operation side of the flat screen printing machine, and the lifting member on the operation side is substantially provided. and ipsilateral screen frame end and, also the with the side opposite the operation side of the lifting member and the same side of the screen frame end coupling each peripheral Rie screen frame support axis the binding perpendicular to the squeegee direction of travel Squeegees are provided on the squeegee carrier in front of and behind the direction of travel of the squeegee, and the squeegee carrier is at one and the other stroke ends, and the squeegee on the required side is Position is controlled by the vertical position control means so that the squeegee carrier is positioned at the position and the other squeegee is positioned at the standby position above the position. When both stroke ends are reached and stopped, the end of the screen frame on the opposite side to the stopped side is slightly moved from the standby position at the upper limit to the lower limit position corresponding to the squeegee position by the raising / lowering means on the opposite side. A screen peeling device in a flat screen printing machine, wherein the screen is lowered to a position before stopping and then lowered to a lower limit position. 4. The screen peeling device according to claim 1, wherein the start of lifting of the screen frame for peeling the screen from the cloth to be printed corresponds to the amount of operation of the squeegee carrier traveling motor. It adapted to be controlled by the amount of signal or timer, and the screen peeling
When raising the screen frame, raise the screen frame edge
A screen peeling device in a flat screen printing machine, wherein the means for detecting an operation amount is used.