JP4344282B2 - Squeegee holder for screen printing equipment - Google Patents

Description

  The present invention relates to a squeegee holder used in a screen printing apparatus.

Squeegee for use in screen printing, Ru der those mounted on a printing machine by holding the squeegee holder.

  When the screen is stretched on the plate frame, the screen is tensioned and bonded. The tension applied to the screen is necessary to keep the screen in tension, but the tension should not be too small, but if it exceeds the limit, it can cause damage to the screen.

  FIG. 1 shows a state in which a screen is stretched on the plate frame. The illustrated screen 1 is bonded to the plate frame 2 with a tension applied, but the center portion is bent due to a natural sagging phenomenon. Further, since the tension applied to the screen is strengthened toward the periphery of the screen, the upward reaction force generated on the screen 1 is generated as a distribution in which the central portion is small and increases toward the peripheral portion.

  FIG. 2 shows a state in which the squeegee is held by a holder of the prior art. A squeegee 4 is detachably held by the holder 3, and the holder 3 has an edge portion of the holding port formed in parallel with the longitudinal direction of the free end edge portion of the squeegee 4. That is, in the prior art, the length of the squeegee 4 protruding from the holding port of the holder 3 is the same as the entire width in front view of the holder. As shown in FIG. 1, the distribution of the reaction force generated on the screen 1 becomes larger toward the periphery, so that when the printing operation is performed using the squeegee 4 sandwiched between the holders 3 of the conventional structure, the squeegee is used. 4, the force that pushes up the squeegee near the both ends is larger than that in the central portion. For this reason, in the vicinity of both ends of the squeegee 4, a slight gap may be formed between the squeegee 4 and the printing material 5, which causes printing defects due to ink bleeding or the like.

  The holder shown in FIGS. 3 and 4 has been developed in order to eliminate the above printing defects. The holder 10 is a squeegee 11 that is detachably clamped. The holder 10 has a front-view shape that tends to be deeper at the center than at both side ends. It was formed. For this reason, as for the length of the squeegee 11 which protrudes from the clamping opening | mouth of the holder 10, both sides are short compared with the center part. The lateral width of the squeegee 11 when viewed from the front is the same as the lateral width of the holder 10.

  In FIG. 4, A indicates a state in which the center portion of the holder 10 is vertically cut, and B indicates a state in which the end portion of the holder 10 is vertically cut. The length at which the squeegee 11 protrudes from the holding port of the holder 10 is formed so that the center part is longer than the end part. Further, when the squeegee 11 is used, the force that cancels out the amount of distortion generated as a force for pushing up the squeegee in response to the reaction force generated on the screen is short in the portion where the squeegee 11 protrudes from the holding port of the holder 10. The one (FIG. 4B) is stronger than the longer one (FIG. 4A).

As shown in FIG. 1, in view of the fact that the distribution of the reaction force generated on the screen increases from the center of the screen toward both sides, the proposed holder pushes the squeegee into the shape of the holder 10. The force acting on the squeegee is formed in a shape in which both ends are larger than the central portion when viewed from the front as the raising force. Acts with a certain force. Therefore, there is no gap between the squeegee 11 and the substrate during the printing operation, and printing defects can be avoided.

FIG. 5 compares the deformation state of the tip of the squeegee when printing is performed using the conventional technique and the proposed holder. In the case of the prior art shown in FIG. 5A, since both ends of the squeegee 4 are larger in distortion than the center part, the tip of the squeegee 4 is deformed in an arc shape in plan view, but in the case of the present invention shown in FIG. The amount of distortion generated in the squeegee 11 is constant, and no deformation occurs at the tip of the squeegee 11 in plan view. Therefore, the proposed holder does not cause a printing defect because there is no deformation of the squeegee during the printing operation as compared with the prior art.

However, the proposed holder has a problem that it cannot be applied to an existing printing press because the edge of the squeegee clamping port is formed in an arch shape when viewed from the front in the shape of the holder.

In the squeegee holder that can perform uniform printing even when the upward reaction force generated on the screen tends to increase toward the plate frame, the present invention uses an auxiliary clamping plate to The objective is to provide a squeegee holder that can be applied to any machine and is highly convenient.

Means for solving the problem is that, in the squeegee holder in which the edge shape of the squeegee clamping port is formed so that the center part is deeper than the both side parts when viewed from the front side, the auxiliary part has a substantially triangular shape at both side parts when viewed from the front side. A sandwiching plate is provided, and the front-view shape of the holder is formed in an arch shape by the auxiliary sandwiching plate.

The present invention provides a holder in which a holding port for holding a squeegee is formed in parallel with a squeegee tip edge, and an auxiliary holding plate having a substantially triangular shape is provided at both ends of the holder when viewed from the front, and the shape of the holder seen from the front is arched Therefore, the present invention has an effect that can be applied to an existing printing machine.

6 and 7 show an embodiment of a squeegee holder according to the present invention. In these drawings, the holder 20 is formed so that the edge of the holding port for holding the squeegee 21 is formed in parallel with the squeegee tip edge in the same manner as the conventional structure. An auxiliary sandwiching plate 22 is provided on the holder 20 so that the sandwiched portion of the holder 20 has an arch shape when viewed from the front.

  The auxiliary clamping plate 22 has a substantially triangular shape inclined to one side when viewed from the front. The auxiliary clamping plate 22 has a clamping part 22a for clamping the squeegee 21 and an attachment part 22b that comes into contact with the bottom part of the holder 20, and stops the attachment part 22b. It is fixed to the holder 20 with a screw 23.

  Since the auxiliary clamping plate 22 can be retrofitted and fixed to a holder having a conventional structure, it can be easily attached to an existing printing press.

Specific examples of holders
A specific example of the proposed arched shape of the holder 10 in a front view is formed in a rounded shape in which the difference in height between the central portion and the end portion is approximately 10 mm when the front width of the holder is about 170 mm.
In addition, when the arch shape is formed with a retrofitting structure using the auxiliary clamping plate 22 in the present invention , if the height of the auxiliary clamping plate 22 is formed to be approximately 10 mm, the front width can correspond to a holder having a front width of around 170 mm. It will be a thing.

The present invention is also applicable to an existing printing press by using an auxiliary clamping plate in a holder that has an effect of avoiding a printing defect without causing a gap between a squeegee and a printing material during a printing operation. The convenience of what you can do.

The side view which shows the state which stretched the screen to the plate frame. The front view which shows the state which used the squeegee using the holder of a prior art. The front view which shows the state which used the squeegee using the holder of an inventor proposal . The cross section of the state which fixed the squeegee to the inventor's proposal holder is shown, A is the center part of a holder, B is each sectional drawing of an edge part to a holder. FIG. 4 is a perspective view showing a comparison of the deformation state of the tip of the squeegee when printing is performed using the holder proposed by the prior art and the inventor , wherein A is the prior art and B is the case proposed by the inventor . Front view of a holder according to an embodiment of the present invention. The perspective view which shows the squeegee fixed part of the holder shown in FIG.

DESCRIPTION OF SYMBOLS 1 Screen 2 Plate frame 3 Holder 4 Squeegee 5 To-be-printed object 10 Holder 11 Squeegee 20 Holder 21 Squeegee 22 Auxiliary clamping plate 22a Clamping part 22b Mounting part 23 Set screw

Claims (1)

In the squeegee holder in which the edge shape of the squeegee clamping port is formed so that the center part is deeper than both side parts when viewed from the front side, the auxiliary clamping plate (22) having a substantially triangular shape at both side parts of the holder (20) when viewed from the front side. A squeegee holder for a screen printing apparatus, wherein the squeegee holder is formed in an arched shape when viewed from the front by the auxiliary clamping plate.

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