JP3055230U - Drum for bottom folding in bottom folding device of bag making machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily adjust the gap with an envelope by vertically shifting a glue blade. SOLUTION: A glued portion 3a by a glue blade in a flat portion 3 of a bottom folding drum 1 is lowered by one step.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bottom folding drum in a bottom folding device of a bag making machine.

[0002]

[Prior art]

 FIG. 5 shows an envelope which can be folded at the bottom by the bag making machine. In the envelope A, a folding line B is formed at the boundary between the body A1 and the bottom attaching piece A2, and at the same time, the body A1 Is applied with glue C on the surface thereof.

[0003] Such an envelope A applies a glue C at the same time that a folding line B is formed at the bottom thereof by a bottom folding device, and a conventional device for performing this is shown in FIGS. 6 to 8.

FIG. 6 shows an example in which a flat portion 102 is formed by notching the outer periphery of a body portion 101 in a cutting line direction to a required width, and a predetermined taper is formed in the vicinity of the front end of the flat portion 102 in the body rotation direction. When the bottom folding drum 100 provided with the suction port 103 for performing suction by imming, and the flat portion 102 of the bottom folding drum 100 comes to a position directly above, the drum rotates in synchronization with this and approaches the flat portion 102. Then, the folding blade 104 and the glue blade 105 for applying the glue at the same time as the folding line is formed on the envelope, and the bottom sticking piece of the envelope disposed in front of the rotation direction of the bottom folding drum 100 are lifted and folded. And a pressing roller 107 for attaching an envelope that rotates in contact with the body 101 of the bottom folding drum 100. Reference numeral 108 denotes an envelope sheet.

When the folding blade 104 and the glue blade 105 approach the flat portion 102 of the bottom folding drum 100, the folding blade 104 moves between the folding portion 104 and the vertical portion 102 a at the front end in the rotation direction of the flat portion 102. The base (the boundary with the body A1) of the bottom adhesive piece A2 is pressed and bent, and at the same time, the glue blade 105 applies the glue to the body A1 of the envelope A.

In the apparatus shown in FIG. 7, the front end in the rotation direction of the flat portion 102 of the bottom folding drum 100 is formed with a V-shaped groove 108 instead of the vertical portion 102a. The device shown in FIG. 8 is similar to the device shown in FIG. 7, except that the vertical portion 102a of the device shown in FIG.

[0007]

[Problems to be solved by the invention]

 In the apparatus shown in FIGS. 6 to 8, the gluing is performed by bringing the glue blade 105 close to the envelope on the flat portion 102 of the bottom folding drum 100.

However, in the related art, since the flat portion 102 is completely flat, there is little space between the adhesive blade 105 and the leading end thereof. It was difficult to adjust. Therefore, in the case of an envelope having a small thickness, the gap is too large, and the amount of glue applied is insufficient, and on the contrary, in the case of an envelope having a large thickness, it is too large. It is also desirable to adjust the interval according to the viscosity of the glue and the amount of glue supplied to the glue blade, but this has not been possible. For these reasons, improvement in this respect has been desired in the past.

The present invention has been made in view of the above points, and an appropriate gap is formed between the tip of the glue blade by lowering the glue application portion on the flat portion by one step, so that the glue blade is moved up and down. It is easy to adjust the distance from the envelope by shifting it in the direction.

[0010]

[Means for Solving the Problems]

 Therefore, the gist of the present invention is to form a flat portion for folding and gluing the envelope by cutting the outer periphery of the body portion to a required width in the cutting line direction, and to form a front end of the flat portion in the body rotation direction. In a bottom folding drum of a bottom folding device of a bag making machine provided with a suction port for performing suction at a predetermined timing in a vicinity portion, a gluing portion by a glue blade in the flat portion is lowered by one step. Located on the bottom folding drum of the bottom folding device of the bag machine.

Further, the rear end side of the flat portion in the body rotation direction may be slightly lower than the outer periphery of the body.

[0012]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view of a bottom folding device which implements a bottom folding drum according to a first embodiment of the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. FIG.

In FIG. 1, reference numeral 1 denotes a bottom folding drum. Further, the bottom folding drum 1 cuts the outer periphery of the body 2 to a required width in the cutting line direction to form a flat portion 3 for folding and gluing the envelope, and the tip of the flat portion 3 in the body rotation direction. A suction port 4 for performing suction at a predetermined timing is provided in the vicinity.

The present embodiment is characterized in that the glued portion 3a of the flat portion 3 by the glue blade is lowered one step.

Reference numeral 5 denotes a folding blade, 6 denotes a glue blade, and 6a denotes a tip of the glue blade. In addition, reference numeral 7 denotes a thin plate for folding back the bottom sticking piece of the envelope, and 8 denotes a pressing roller for sticking the envelope.

In this embodiment, since the glued portion 3a of the flat portion 3 by the glue blade is made one step lower as described above, the one step lowered portion and the tip of the glue blade are formed. It is possible to create a larger interval between them. Therefore, it is possible to easily adjust the gap with the envelope by shifting the glue blade upward and downward.

Furthermore, in the present embodiment, the rear end side of the flat portion 3 in the body rotation direction, that is, the rear end side 3b of the glued portion 3a, which is one step lower, is slightly lower than the outer periphery of the body portion 2. This makes it possible to use the elasticity of the envelope sent along the outer periphery of the body 2 to increase the pressing force of the glue blade on the envelope, thereby making the gluing on the envelope more reliable.

Further, in this embodiment, the rear end side of the flat portion 3 in the body rotation direction is slightly lower than the outer periphery of the body 2 as described above, but as shown in FIG. The rear end side of 3 does not have to be lower than the outer periphery of the trunk.

[0019]

[Effect of the invention]

 The present invention has the configuration and operation as described above.Since the gluing portion by the glue blade in the flat portion is lowered by one step, the glue blade can be shifted vertically to make it easier to adjust the gap with the envelope. it can.

When the rear end side of the flat portion in the body rotation direction is slightly lower than the outer circumference of the body, the elasticity of the envelope sent along the outer circumference of the body is used to make the envelope of the glue blade. The pressing force on the envelope can be increased, and the gluing to the envelope can be further ensured.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a bottom folding device that implements a bottom folding drum according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a plan view of a flat portion of the bottom folding drum according to the first embodiment of the present invention.

FIG. 4 is a front view of a flat portion of a bottom folding drum according to a second embodiment of the present invention.

FIG. 5 is a plan view of the envelope before the folding line is formed.

FIG. 6 is an explanatory diagram of a bottom folding drum in a conventional bottom folding device.

FIG. 7 is an explanatory diagram of another example of the bottom folding drum in the conventional bottom folding device.

FIG. 8 is an explanatory view of another example of the bottom folding drum in the conventional bottom folding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum for bottom folding 2 Body 3 Flat part 3a Glue part in flat part 4 Suction port 5 Folding blade 6 Glue blade

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[Procedure amendment]

[Submission date] June 30, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (2)

[Utility model registration claims] 1. An outer periphery of a body portion is cut in a required width in a cutting line direction to form a flat portion for folding and gluing an envelope, and suction is performed at a predetermined timing in a portion near the front end of the flat portion in the body rotation direction. In the bottom-folding drum of the bottom-folding device of the bag-making machine provided with a suction port for performing the bottom-folding, the glued portion by the glue blade in the flat portion is lowered by one step, and the bottom-folding in the bottom-folding device of the bag making machine is performed. For drums. 2. A bottom folding drum in a bottom folding device for a bag making machine according to claim 1, wherein the rear end side of the flat portion in the body rotation direction is slightly lower than the outer periphery of the body.