JPH0811288A - Squeegee holder - Google Patents

Abstract

PURPOSE:To attach a squeegee having a square cross section while ensuring high linearity without unnecessarily deforming the squeegee in the squeegee holder of a cream solder printer. CONSTITUTION:A squeegee holder is constituted of a core plate member 50 having a V-shape groove which comes into contact with both side surfaces of the corner part 12 provided at a diagnal position with respect to the corner part 11 becoming the leading end of a squeegee 10 formed to one end thereof and a pair of side plate members 60,70 having the inclined surfaces 62, 72 coming into contact with both side surfaces of the corner part 11 of the squeegee 10 formed to one inside surfaces thereof and attached to both sides of the core plate member 50 so as to hold the squeegee 10 between the V-shape groove and the inclined surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeegee holder for holding a squeegee having a rectangular cross section in a cream solder printing machine.

[0002]

BACKGROUND ART chip part surface mounting of the background general PCB invention, FIG. 5
As shown in, after applying the cream solder to the substrate with the cream solder printer 1, mounting the chip with the high-speed mounter 2 and the variant mounter 3, and reflowing the solder in the reflow furnace 4 to fix the connection of the chip, It is usually completed through an inspection process in the inspection machine 5. Here, as shown in FIG. 6, the cream solder printing machine 1 has a corner portion 11 (corner portion) of a long squeegee 10 having a constant cross-sectional shape.
Is pressed and slid on a screen 22 having slits 21 corresponding to the application pattern, so that the cream solder 23 on the screen 22 is pushed into the slits 21 and applied on the substrate 24 on the back side of the screen 22. It is a thing.

Therefore, in order to make the coating thickness of the cream solder 23 uniform and prevent problems such as generation of bridges, the cream solder 23 is pressed against the screen 22 in parallel while maintaining the linearity of the corner 11 which is the tip of the squeegee. It is necessary to slide the squeegee 10 at its corners 1 for this purpose.
The function of the squeegee holder 25 that grips 1 in a protruding state is important. There are squeegee shapes such as a flat shape and a sword shape, but particularly for a squeegee 10 having a quadrangular cross section (so-called square squeegee), there has been no squeegee holder capable of holding the squeegee 10 well, which has been a problem. .

Conventional Squeegee Holder (a) Conventional Example 1 FIGS. 7 and 8 are side views showing a first conventional example (conventional example 1) of a squeegee holder for a square squeegee. This squeegee holder has a pair of plate members 33 and 34 in which V-shaped grooves 31 and 32 corresponding to both sides of the squeegee 10 are formed inside the lower end, and these plate members 33 and 34 are arranged at a plurality of positions in the longitudinal direction. It is of a two-division type that is used by fastening with bolts 35. In this type, the diagonal dimension L (shown in FIG. 11) of the squeegee 10 in the natural state is the minimum finished value, and the corresponding dimension L1 on the holder side (FIG. 8).
(Shown in FIG. 4) is made small, and the squeegee 10 can be grasped so as to be surely compressed from both sides regardless of the finishing accuracy.

(B) Conventional Example 2 FIGS. 9 and 10 show a second squeegee holder for a square squeegee.
It is a side view which shows the prior art example (prior art example 2). This squeegee holder has a pair of plate members 43 and 44 in which V-shaped grooves 41 and 42 which are pressed against both sides of the squeegee 10 are formed respectively, similarly to the plate members 33 and 34 of the first conventional example. 44 is fastened and used, but a corner portion 12 (another corner portion) at a diagonal position of the corner portion 11 of the squeegee 10.
It is characterized in that a plurality of top members 45 are provided in the longitudinal direction of the squeegee 10 so as to be vertically movable at a position above.
In this type, a headless screw 4 screwed into the plate material 43
By pushing down the top member 45 with 6, the squeegee 1
It is possible to perform an operation of deforming the corner portion 12 of 0 to push it downward, and when the corner portion 11 of the squeegee 10 is locally recessed upward, this recess is corrected by this operation.

[0006]

However, first, the conventional example 1
In the squeegee holder described above, as the bolt 35 is tightened, the squeegee 10 is deformed by the force of being crushed from both sides as shown in FIG. 11 and extends in the vertical direction. Since it does not occur evenly, the tip of the squeegee (in this case, the corner portion 11) loses the linearity only by controlling the tightening force of the bolt 35. Therefore, the bolt 35
It is necessary to secure the linearity by adjusting the tightening degree and the like on the basis of experience and the like, and there has been a problem that high skill is required to realize good application of cream solder.

On the other hand, in the squeegee holder of the conventional example 2, in the case where the local depression in the longitudinal direction of the squeegee 10 of the corner portion 11 cannot be corrected only by the tightening amount of the screws for fastening the pair of plate members 43 and 44. However, the squeegee 1 can be corrected by locally pushing down the squeegee 10 by tightening the headless screw 46 and pushing down the top member 45 at the position where the dent occurs.
There is a problem that it becomes extremely difficult to use the other corners of 0 as the tip of the squeegee, and the replacement period of the squeegee 10 becomes short.

This is because when the dent is corrected by the top member 45 as described above, an excessive load is applied to the squeegee 10 as shown in FIG.
Of the four corners, the corner (for example, the corner 12) not used as the tip of the squeegee is locally deformed and used. Therefore, even if the squeegee 10 is turned upside down and attached again, and the corner 12 is used as the tip of the squeegee, the corner 12 is permanently deformed, and it becomes impossible to straighten out the tip of the squeegee. If this is not possible, and eventually one of the four corners is used as the tip of the squeegee and wears out, the squeegee 10 as a whole may have to be replaced with a new one.

Therefore, according to the present invention, a squeegee having a quadrangular cross section can be gripped while ensuring high linearity without being unnecessarily deformed,
Moreover, it is an object of the present invention to provide a squeegee holder that does not require any skill to attach the squeegee.

[0010]

In order to achieve the above object, in the squeegee holder according to the first aspect of the present invention, one corner of a squeegee having a rectangular cross section is pressed against a screen having slits corresponding to the coating pattern. A squeegee holder for gripping the squeegee in a cream solder printer that presses the cream solder on the screen into the slits by sliding and applies the cream solder on the substrate on the back side of the screen. A core plate member having a V-shaped groove formed at one end that abuts on both side surfaces of the other corner portion that is diagonally opposite to, and an inclined surface that abuts on both side surfaces of the one corner portion of the squeegee. And a pair of side plate members attached to both sides of the core plate member so as to sandwich the squeegee between the V-shaped groove and the inclined surface. And butterflies.

The squeegee holder according to a second aspect of the invention is characterized in that the pair of side plate members are attached to the core plate member so as to be positionally changeable in a direction in which the squeegee is sandwiched.

[0012]

In the present invention, the V-shaped groove of the core plate member is attached to both sides of the core plate member so as to abut on both sides of one corner portion used as the tip of the squeegee and the other corner portion diagonally located. By contacting the inclined surfaces of the side plate member with the surfaces on both sides of the one corner, the right and left sides of the squeegee are vertically sandwiched and gripped. Therefore, the force for gripping the squeegee hardly causes deformation of one corner portion used as the tip of the squeegee, which improves the skill of attaching the squeegee (attaching the side plate member to the core plate member). Regardless, the one corner is highly linear along the V-shaped groove of the core plate member.

When the side plate member is attached to the core plate member such that the position of the side plate member can be changed in the direction in which the squeegee is clamped, the force for clamping the squeegee between the V-shaped groove and the inclined surface (that is, the squeegee). It is possible to reliably prevent permanent deformation of other corners by adjusting the amount of deformation of the other) to the minimum. Therefore, it is possible to ensure that the four squeegee tips are sequentially used as the four corners of the quadrangular cross section to maximize the replacement period of the squeegee.

[0014]

Embodiment 1 Hereinafter, a first embodiment (Embodiment 1) of the present invention will be described with reference to FIGS. The squeegee holder of the first embodiment is
As shown in FIG. 1, the core plate member 50 and the core plate member 50.
A pair of side plate members 60 attached to both sides of the
And 70. The core plate member 50 is a strip-shaped plate member that is long in a direction orthogonal to the paper surface in the drawing, and has a length equal to or longer than that of the squeegee 10. At the lower end of the core plate member 50 in the width direction, the corner portion 11 that is the squeegee tip of the squeegee 10 is provided.
V-shaped grooves 51 are formed to abut on both sides of the corner 12 (the other corner) diagonally opposite to the (one corner). The core plate member 50 is connected to the movable portion of the cream solder printing machine at the upper end side in the width direction and has its lower end parallel to the upper surface of the screen 22 (shown in FIG. 6) on the above-mentioned substrate 23 which is set horizontally. In the state where they are opposed to each other, they can be translated in the lateral direction (the left-right direction in the drawing). Here, the movable portion is a portion that moves up and down and moves in parallel with respect to the screen 22 in order to drive the squeegee 10.

The side plate members 60 and 70 are strip-shaped plate members having a length equivalent to that of the core plate member 50. The side plate members 60 and 70 are joined to both sides of the core plate member 50 and attached to the core plate member 50 by bolts or the like in this case without changing the position. To be These side plate members 60, 70
V-shaped grooves 61 and 71 into which the right and left sides of the squeegee 10 are fitted respectively are formed on the inner surface of the lower end of the. The shape dimensions and forming positions of these V-shaped grooves 61, 71 are set as follows. That is, as shown in FIG. 2, the three corners of the squeegee 10 are fitted into the V-shaped grooves 51, 61, 71, respectively, and the side plate members 60, 70 are attached to the core plate member 50 (that is, the squeegee 1).
In a state in which 0 is gripped), the V-shaped groove 51 and the lower inclined surfaces 62 and 72 of the V-shaped grooves 61 and 71 have the squeegee 1.
Dimensional error of the squeegee 10 is taken into consideration so that the squeegee 10 is pressed into contact with the squeegee 0 and sandwiched between the squeegee 10 and the inclined surfaces 63 and 73 of the V-shaped grooves 61 and 71 and the squeegee 10 is loosely contacted or a gap is formed. Has been set.

In the above-mentioned squeegee holder, the V-shaped groove of the core plate member 50 abuts on both sides of the corner portion 12 diagonally opposite to the corner portion 11 used as the tip of the squeegee, as shown in FIG. The inclined surfaces 62 and 72 of the side plate members 60 and 70 contact the surfaces on both sides of the corner portion 11, respectively, thereby sandwiching the left and right sides of the squeegee 10 in the vertical direction (vertical direction in the figure) as shown in FIG. Hold it. Therefore, the force for gripping the squeegee 10 hardly causes deformation of the corner portion 11 used as the tip of the squeegee,
Installation work of the squeegee 10 (side plate member 6 to the core plate member 50
The corner portion 1 regardless of the degree of skill of (0, 70 mounting work)
1 is highly linear along the V-shaped groove 51 of the core plate member 50. Therefore, the normal worker is squeegee 10
Even if the soldering is done, the cream solder can be applied well without causing problems such as bridging, which in turn facilitates the surface mounting of chip parts on the printed circuit board, work quality, and reliability. It can contribute to the improvement of sex.

Second Embodiment Next, a second embodiment (second embodiment) of the present invention will be described with reference to FIG. The same elements as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the squeegee holder according to the second embodiment, the pair of side plate members 60 and 70 is the core plate member 50.
By sandwiching and fastening each other, the core plate member 5
It is attached to 0. That is, as shown in FIG. 4, through holes 64 and 52 are formed in the side plate member 60 and the core plate member 50, respectively, and a bolt 80 penetrates these through holes 64 and 52 to form a screw hole in the side plate member 70. The side plate members 60 and 70 are attached to the core plate member 50 by being screwed into 74. The through hole 52 of the core plate member 50 is a so-called elongated hole having an oval cross-section in the direction in which the squeegee 10 is sandwiched (vertical direction in FIG. 4), whereby the side plate members 60, 70 are formed. Member 5
The position of the squeegee 10 can be changed with respect to 0.

In the squeegee holder according to the second embodiment, the squeegee 10 is sized according to the finished dimension of the squeegee 10.
Permanent deformation of the other corners (three corners other than the corner 11) by adjusting the force (that is, the amount of deformation of the squeegee 10) sandwiched between the character-shaped groove 51 and the inclined surfaces 62 and 72 to the minimum. Can be reliably prevented. Therefore, the four corners of the squeegee 10 having a quadrangular cross section can be sequentially used as the squeegee tip to maximize the replacement period of the squeegee 10 and reduce the consumable cost (operating cost) of the cream solder printing machine. it can.

MODIFIED EXAMPLE The present invention is not limited to the above embodiment, but may have various modes. For example, in the second embodiment, the side plate members 60, 70
Each of the side plate members 60 and 70 is attached so that the side plate members 60 and 70 can be repositioned by forming an oval through hole in each of the holes and screwing the bolt into the screw hole formed in the core plate member 50 by penetrating the through hole. May be.

[0020]

According to the squeegee holder of the present invention, the force for gripping the squeegee hardly causes deformation of one corner portion used as the tip of the squeegee, regardless of the skill of the squeegee mounting work. Instead, the one corner is ensured to have high linearity along the V-shaped groove of the core plate member. Therefore, even when a normal worker attaches the squeegee, the cream solder can be applied well without causing a problem such as a bridge, and by extension, the surface mounting of the chip component on the printed circuit board or the like can be performed. It can contribute to improvement of workability, work quality and reliability.

Moreover, when the side plate member is attached to the core plate member so that the position of the side plate member can be changed in the direction in which the squeegee is sandwiched, the force for sandwiching the squeegee between the V-shaped groove and the inclined surface is minimized. Thus, it is possible to reliably prevent the permanent deformation of the other corners. Therefore, the four corners of the quadrangular cross section are sequentially used as the tip of the squeegee, so that the replacement period of the squeegee can be maximized, and the consumable cost (operating cost) of the cream solder printing machine can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a squeegee holder that is a first embodiment of the present invention.

FIG. 2 is a side view showing a usage state of the squeegee holder according to the first embodiment of the present invention.

FIG. 3 is a side view for explaining a mounting state of the squeegee on the squeegee holder which is the first embodiment of the present invention.

FIG. 4 is a side view showing a squeegee holder that is a second embodiment of the present invention.

FIG. 5 is an overall configuration diagram showing a surface mounting system of a chip component.

FIG. 6 is a side view showing a principle and a main configuration of a cream solder printing machine.

FIG. 7 is a side view showing a configuration of a squeegee holder which is a first conventional example.

FIG. 8 is a side view showing a usage state of a squeegee holder which is a first conventional example.

FIG. 9 is a side view showing a configuration of a squeegee holder which is a second conventional example.

FIG. 10 is a side view showing a usage state of a squeegee holder which is a second conventional example.

FIG. 11 is a diagram illustrating a force applied to a squeegee when the squeegee holder is a first conventional example and the squeegee is gripped.

FIG. 12 is a diagram illustrating a force applied to a squeegee when a squeegee holder is a second conventional example and the squeegee is held.

[Explanation of symbols]

 1 Cream Solder Printer 10 Squeegee 11 One Corner 12 Other Corner 21 Slit 22 Screen 23 Cream Solder 24 Substrate 50 Core Plate Member 51 V-Shaped Groove 60, 70 Side Plate Member 62, 72 Sloping Surface

Claims (2)

[Claims] 1. A squeegee having a quadrangular cross section is pressed against a screen on which a slit corresponding to a coating pattern is formed to slide the cream solder on the screen into the slit, and In a cream solder printing machine that applies on the substrate behind the screen,
A squeegee holder for gripping the squeegee, comprising a core plate member having V-shaped grooves formed at one end, the V-shaped grooves being in contact with surfaces on both sides of one corner of the squeegee and the other corner diagonally located,
An inclined surface that abuts on both side surfaces of one corner of the squeegee is formed on one inner side surface, and is attached to both sides of the core plate member so that the V-shaped groove and the inclined surface sandwich the squeegee. A squeegee holder comprising a pair of side plate members. 2. The squeegee holder according to claim 1, wherein the pair of side plate members are attached to the core plate member so as to be positionally changeable in a direction in which the squeegee is sandwiched.