KR970001675B1 - Squeegee turn-over apparatus for screen printing machine - Google Patents

Abstract

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Description

Squeegee Inverter of Screen Printing Machine

The figure shows one embodiment of the device of the invention,

1 is a partial plan view of a screen printing machine using the apparatus of the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a partially omitted cross-sectional view of the main part.

4 is a longitudinal cross-sectional view partially enlarged and enlarged in the center of FIG.

5 and 6 show an operating state.

* Explanation of symbols for main parts of the drawings

1: body 2: endless belt

4: screen frame 6: mounting bracket

7: bracket 8: squeegee

10: guide frame 11,12: gear

13: timing belt 14: guide rail

20: carrier 21: the body of the carrier

22: space portion 23: end fitting hole

23 ': fitting hole 24,25: guide piece

26: guide groove 27: cover

28: bearing 30: support shaft

31: Operation piece 35: Cambar

36: Cam 37: Pad

38: fitting piece 40: friction disc

45: narrowing drive mechanism 46: narrowing

47: support pin 48: leaf spring

49: support plate 50: gear meshing with the timing belt

51: press roller

The present invention has a cam mechanism at an inclination angle set at its carrier part when a squeegee in an automatic screen printing machine starts driving at its running start position, and rotates to switch to an operating position. It relates to a squeegee inverter of the screen printing as possible.

Various methods have already been proposed for the apparatus for switching the moving posture of the squeegee in the flat type automatic screen printing machine, and some of them are actually used. Most of them squeegee arcs around the support shaft in the squeegee carrier in the vicinity of the stationary position by contacting the operating piece of the support shaft attachment supported on the squeegee carrier with the inverting operation body fixed near both ends of the travel movement range of the squeegee. It is configured to turn the ulder by rotating the required angle.

Alternatively, the holder of the squeegee may be directly operated by a fluid pressure cylinder to raise the front side in the traveling direction, and the rear side may be actively brought into contact with the screen surface to travel.

In addition, as disclosed by Japanese Patent Application No. 34-5242, Japanese Patent Application Laid-Open No. 56-121768, Japanese Patent Application Laid-Open No. 56-150551, and Japanese Patent Application Publication No. 59-56036, have.

In this method, when the squeegee carrier travels for a certain distance and is switched to the next movement, the cam installed in the squeegee carrier is moved for a certain length by being connected to the driving driving chain, thereby inverting the squeegee to cope with the next movement operation. .

In the prior art, the squeegee may sometimes run as if the squeegee is not inverted completely in the same manner as the former, and of course, it is not suitable for printing operation.

In particular, the squeegee prints in a state in which it is impossible to reliably obtain a pressing force (hereinafter referred to as squeegee pressure) to sweep the dye paste down along the screen surface.

In the form of operating a squeegee with a fluid pressure cylinder, the squeegee switching device can achieve an optimum squeegee pressure, but the structure is complicated.

In order to achieve the smooth operation, maintenance and repair of the entire apparatus must be faithfully performed, management is cumbersome, and the structure is complicated.

Each of the latter methods is more reasonable than the former, but disclosed in Japanese Patent Laid-Open No. 56-121768 discloses a configuration in which two squeegees are operated by switching up and down in the up and down direction by the operation of a gear in conjunction with operation by a cam. It is.

Therefore, the squeegee pressure is difficult to stabilize, and therefore, it is difficult to adjust the contact state between the squeegee and the screen surface.

As disclosed in Japanese Patent Application Laid-Open No. 56-150551, the contact posture with respect to the squeegee and the screen surface is constant, and the structure is switched so that the two perform different purpose operations.

Therefore, it is only necessary to specify and switch the contact pressure with respect to the screen surface.

However, it is difficult to apply it for the screen printing machine which requires the same conditions in either direction in reciprocating movement.

Moreover, since the squeegee is supported by the both sides in the width direction with respect to the screen surface, what is disclosed by the real-estate 59-56036 is that even if there is a slight deviation | deviation in both support parts, resistance will increase by the misalignment.

When the resistance increases, a slip occurs between the cam and the cam roller during the inversion operation by the cam, so that it is difficult to always perform a reliable inversion operation, and there is a problem that the squeegee pressure is not set as well by repeating the excessive operation.

In any of the above cases, when the carrier runs along the guide portion of the guide frame, the resistance piece is pushed on the side of the guide frame so as not to overrun by inertia.

Thus, the driver is overloaded and required more power than necessary.

On the other hand, in recent years, since the driving speed is required, it becomes more inconvenient.

An object of the present invention is to provide a squeegee inverting device having a simple configuration that can be reasonably more reliably reversed and can cope with high-speed operation without overloading.

That is, the present invention is directed to a squeegee inverting device in an automatic screen printing machine: the carrier of the squeegee is driven by an electric motor by steplessly tensioning in a pair of guide frames which are exaggerated in the upper part of the final dye conveyance belt. Connected to the cold interlocking conduction band, each of which is arranged freely to travel; The driving drive force is transmitted to the carrier after the carrier moves in a predetermined distance before the start of the carrier, in connection with the cold taste conduction band; An operation piece for pivoting the support shaft by a cam roller on the side end side by a cam of a cam bar fixed to and disposed on the support shaft provided on the carrier in the carrier direction; In addition, the friction plate of the flat plate shape; A gripping drive mechanism attached to the side of the cam bar and sandwiching a portion of the cam bar in contact with the friction disc to exchange the cam bar's movement force with rotational force; It is characterized in that it is a configuration in which the holder attachment body of the squeegee is fixed to the support shaft short axis protruding from both carriers.

Moreover, on the support shaft provided in the said carrier, the gear which forcibly engaged with the driven side tooth part of the cold engagement conduction band penetrating the inside of this carrier is loosely supported.

This is a kind of braking mechanism, which prevents overruns during the running and stopping of the carrier, reduces the load on the driver, and facilitates high speed operation.

Chains are common as winding engagement conduction bands for driving a carrier.

However, by using the timing belt, it is possible to cope with the reduction of running inertia and speed up by the amount of hardening of the drive unit, and also to prevent the occurrence of noise.

According to the squeegee inverting device of the present invention having such a configuration, when the carrier driving winding engagement conduction band of the squeegee starts to run at the carrier stop position, the squeegee inverting device moves loosely until the stopper on the side of the cam bar and the carrier end face come into contact.

During this loose movement, a cam roller is operated by the cam of this cam bar, and the piece piece rotates, and the attachment support shaft rotates a required angle.

The support shaft is fixed with a friction plate having a flat main plate shape.

The pinning pin of the pinch driving mechanism attached to the cam bar pinches the outer circumferential portion of the friction disc in the movement required section to rotate the friction disc at the required angle.

As a result, the squeegee switching operation through the support shaft by the cam in the operation piece is reliably performed.

No matter how slippage occurs between the cam roller and the cam, the support shaft must be operated by the friction rotation operation between the friction disc fixed to the support shaft and the clamping piece of the gripping drive gear attached to the cam bar. Required rotation angle is rotated.

In this way, the squeegee is always inverted accurately and the printing paste can be printed on the final dyeing cloth by a certain squeegee pressure.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 are examples of one embodiment of a printing unit in a flat automatic screen printing machine.

Between the bases 1 arrange | positioned in parallel by the required space | interval, the endless belt 2 which carries and conveys the final dyeing cloth A intermittently sent by a fixed distance is arrange | positioned.

On the upper end of the endless belt 2, a pair of guide frames 10 and 10 are supported on the left and right bodies 1 and 1, both ends of which are supported by lifting mechanisms (not shown).

These are arranged at required intervals perpendicular to the movement direction of the endless belt 2.

The screen frame 4 is attached by the support body 3 between the guide frames 10 and 10.

Each of the guide frames 10 and 10 has a groove shape in which the opposite side is opened, and therein is a reciprocating sliding free carrier 20 guided by a guide rail (described later) provided in the guide frame 10.

A pair of squeegees 8 are attached to the carriers between the carriers 20 and 20 at required angles via the mounting bracket 6 and the brackets 7.

An interlocking conduction band (in this embodiment, a timing belt 13 is used), which is wound between the gears 11 and 12 disposed at both ends of the guide frames 10 and 10 and driven by the electric motor M. Therefore, the timing belt 13 is used. The carrier 20 is driven by the timing belt.

The carrier 20 of the squeegee has a box shape in which the front surface (open side of the guide frame 10) is opened as shown in FIGS. 3 and 4.

The main body 21 is provided so that the end fitting hole 23 in the lower half of the both sides of the longitudinal direction may communicate with the inner space part 22 of the flat fitting hole 23 'in the upper half. Guide pieces 24 and 25 are also provided along the upper and lower surfaces of the main body 21.

The guide pieces 24 and 25 are provided with guide rails 14 and 14 which are extended on the upper and lower sides of the guide frame 10 and guide grooves 26 that slide freely.

The cam bar formed by attaching the cam 36 formed in the shape of an arc to the upper surface of the center part in the cross section square whose length is longer than the length dimension of the carrier main body 21 by the required length L inside the carrier 20 in this way. 35 is disposed.

The cam bar penetrates through the end fitting holes 23 and 23 along the upper surface of the lower guide piece 24.

At the central portion of the main body 21, the support shaft 30 is provided to be supported by the bearings 28 and 28 disposed on the inner surface and the front attachment cover 27 so as to protrude from the cover 27.

On this support shaft 30, a piece 31 and a friction disc 40 formed in a flat main plate shape are fixedly disposed.

On both ends of the cam bar 35, fitting pieces 38 for connecting the timing belt 13 to each other via pads 37 having a cushioning property are fixed.

By this fitting piece 38, the timing belt 13 wound around the gears 11 and 12 disposed at both ends of the guide frame 10 is connected endlessly.

Moreover, the driven shaft (upper shaft) of this timing belt 13 has penetrated the inside through the fitting holes 23 and 23 'of the upper half of the carrier main body 21. As shown in FIG.

The driven shaft is engaged with the gear 50 loosely supported on the support shaft 30 in the space 22 in the main body 21.

Reference numeral 51 denotes a push roller which causes the teeth of the timing belt 13 to always be bitten with the gear 50, and is attached to the main body 21 by the shaft pin 52.

The operation piece 31 has an arm extended to the left and right (in FIG. 3) equal length from the attachment part of the support shaft 30. As shown in FIG.

Cam rollers 32 and 32 'are attached to the tip of this arm, and either one of these cam rollers 32 and 32' is in contact with the cam 36 on the cam bar 35.

And it is related with the movement amount of the cam bar 35 so that the required rotation angle support shaft 30 may be reverse-reversely rotated.

That is, as shown in FIG. 3, one cam roller 32 is brought into contact with the uppermost value of the cam 36 in a state in which the cam bar 35 moves as far as possible in the left direction (of course, the cam). When the bar 35 moves in the right direction, the bar 35 is reversed to that shown in the drawing.)

In this state, the pair of squeegees 8 supported by the mounting bracket 6 attached to the end of the support shaft 30 and the bracket 7 are screened in the moving direction (arrow direction) as indicated by the dashed lines. It is in a skimming position.

On the side of the intermediate portion of the cam bar 35, a pinch driving mechanism 45 is provided for cooperating part of the friction disc 40 on both sides. This clamping drive mechanism 45 consists of two clamping pieces 46 and 46 which made the upper inner surface into the inclined surface which coincides with the inclined surface of the friction disc 40. As shown in FIG.

This clamping piece is arrange | positioned so that the inclined surfaces may mutually oppose and close by the spring spring 48 interposed in the support pin 47. As shown in FIG.

Both clamping pieces 46 and 46 are in contact with the friction disc 40 because they are in contact with the lower end of the support piece 49 so that they are not rotated around the support pins 47 even when the clamping pieces are tightened.

47 'is a snap ring for holding the leaf spring 48. The operation of the apparatus of the present invention configured as described above is as follows.

According to a series of operations of the automatic screen printing machine, the guide frames 10 and 10 are lowered by a series of operations of the elevating mechanism so that the screen-type frame 14 is in contact with the final dyeing cloth (A).

Thereafter, the drive-type electric motor M of the squeegee 8 is operated so that the squeegee drive timing belt 13 starts traveling in the required direction.

As for the squeegee 8 and 8 originally shown in FIG. 5, the cam bar 35 connected to this timing belt 13 is first pulled along with the movement of the timing belt 13.

This slides the inside of the main body 21 of the carrier 20 by the length L which was in the state which protruded from the side end surface 21 'of the main body 21 of the carrier 20.

Next, the operation piece which was left ascending in the figure by the cam 35 on the cam bar 35 until the pad 37 abuts against the side end surface 21 'of the main body 21 ( One cam roller 32 of 31 is lowered as the cam bar 35 moves.

Subsequently, in the figure, the cam roller 32 'on the right side is pushed up by the cam 36 and rotates around the support shaft 30 in the reverse state.

As a result, as shown in FIG. 6, the squeegee 8 is reversed through the mounting bracket 6 and the bracket 7 like the support shaft 30 to which the operation piece 31 is fixed.

When the pad 37 at the end of the cam bar 35 is in close contact with the side end surface 21 ′ of the carrier main body 21, the carrier 20 is pulled by the tension force of the timing belt 13 directly connected to the cam bar 35. ) Will run.

In the squeegee 8, the front side of the squeegee 8 rises, and the rear side of the squeegee 8 sweeps the printing paste with the required squeegee pressure on the screen surface of the screen-type frame 4, and prints it against the final printing cloth.

In parallel with the direct inversion operation by such a driving driving timing belt 13, the present invention has the following characteristic action.

That is, the clamping pieces 46 and 46 of the pinch driving mechanism 45 attached to the cam bar 35 abut against the friction disc 40 on the support shaft 30 with the movement of the cam bar 35.

At this time, in the non-contact state, the inclined surface portions of the two clamping pieces 46 and 46, which are spaced apart by the leaf springs 48 on the support pins 47, come into contact with the friction disc 40 at the end in a tangential direction.

Since the relationship between the rotational center of the friction disc 40 and the passing position of the sandwich pieces 46 and 46 does not change, both the sandwich pieces 46 and 46 are gradually resisted by the pressure applied by the leaf spring 48. The friction disk 40 is pushed to both sides to widen.

Since the clamping pressure of the friction disks 40 by the clamping pieces 46 and 46 is gradually increased in proportion to the amount of the push-up, the clamping pieces 40 and 46 are clamped from the start to the end of the clamping of the friction disks 40. During the rotation, the support shaft 30 is additionally rotated through the friction disc 40.

Of course, the clamping pieces 46 and 46 stop the contact with the friction disc 40 just before reaching the traction driving state of the carrier 20 by the cam bar 35 and excessively support the support shaft 30. There is no rotation.

In addition, since the pair of carriers 20 and 20 are driven to be driven in synchronization with the drive shaft 14, the squeegee (heated between the two carriers 20 and 20) is driven. 8, 8) are correctly operated by the above-described method.

In this manner, when the printing operation is stopped by traveling the required distance, the squeegee 8 is stopped as it is and waits until the next printing operation is transferred in the predetermined order.

Then, when the driving mechanism of the squeegee is instructed to run in the opposite direction to the above, the cam bar 35 first operates in the reverse direction, and then each part also operates in reverse, so that the squeegee 8 reverses and continues printing. It switches to skimming in its original direction and returns to its return.

In addition, when the carrier 20 travels, it is forcibly engaged with the driven shaft of the timing belt 3 and the gear 50 that is loosely supported on the support shaft 30 to move the carrier 20. This is a kind of braking action because it is supposed to synchronize with the speed of movement.

Therefore, the carrier does not overrun at the time of stoppage or while driving.

In addition, when the end of the fitting 38 comes into contact with the end face of the cairr by the sliding motion of the cam bar 35, the pad 37 receives a buffering action.

As described above, since the buffer 50 is also cushioned by the engagement of the gear 50 and the teeth of the timing belt 13, the carrier can run smoothly without initial starting.

The cam attachment position in the cam bar is not limited to the upper side of the cam bar, but may be attached to the side portion as necessary.

The foregoing has described the use of the timing belt as the winding engagement conduction band, but the same may be used with the chain.

For example, when a chain consisting of a plastic link and a metal link is used, the noise can be reduced and the weight can be reduced even at high speeds.

Naturally, the driving force is also reduced to obtain a reasonable device.

According to the present invention, as described above, the printing operation is started after the reversal of the squeegee is reliably completed by inverting the squeegee by inverting the cam as well as the operation of actively rotating the friction disc. The appropriate squeegee pressure acts.

Moreover, since normal driving can be performed without giving resistance which is a factor of overload at the time of driving, the driver is also compact and has the advantage that the object can be achieved, and in addition, it is easy to speed up.

Of course, there is no structural problem, it becomes a useful device that is trouble-free and withstands long-term use.

Claims (5)

The carrier 20 of the squeegee 8 is caught in an endless tension in a pair of guide frames 10 overlaid on the top of the final dye conveyance belt 2 and driven by an electric motor. Connected to each other and arranged freely for running; In each of the carriers 20, it is connected to the winding engagement conduction band 13 so that the driving driving force is transmitted to the carrier 20 after the predetermined distance L is moved before starting the carrier; The cam bar 35 provided with the cam of one side, and the operation piece 31 fixedly installed on the support shaft 30 provided so as to cross | intersect in the movement direction of this carrier are the cams of the side end side by the said cam 36. It is a structure which rotates this support shaft 30 by required angle via the rollers 32 and 32 '; In the squeegee inverting apparatus in the automatic screen printing machine which fixes the holder attachment bodies 6 and 7 of the squeegee to the short axis of the support shaft which protrudes from both carriers; A friction disc 40 formed on the carrier shaft 30 and fixed to the support shaft 30 and embedded in the carrier 20 so as to be rotatable with a predetermined angle with the operation piece 31; And a gripping drive mechanism 45 attached to the side of the cam bar 35 to pinch a portion of the cam bar 35 in contact with the friction disc 40 to convert the cam bar's movement force into rotational force. Printing Squeegee Inverter. 2. The clamping driving mechanism (45) according to claim 1, wherein the clamping driving mechanism (45) is made from a pair of clamping pieces (46) pressed in an approaching direction with a spring, and the clamping pieces (40) have a configuration in which the friction disc (40) can be fitted. Squeegee inverter of screen printing. The gear 50 according to claim 1 or 2, which is forcibly engaged with the driven side engagement portion of the winding engagement conduction band 13 passing through the inside of the carrier on the support shaft 30 provided in the carrier 20. Squeegee inverter of the screen printing machine, characterized in that loosely supporting. 4. The squeegee inverting device according to claim 3, characterized in that the cold engagement conduction band (13) is a chain. 4. The squeegee inverting device according to claim 3, characterized in that the winding engagement conduction band (13) is a timing belt.

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