JP3047336U - Film tensioning equipment in bag making equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function of drawing a packaging film in a feed direction or returning it to a reverse direction in order to finely adjust a position in a width direction of a vertical seal applied to an uncut continuous bag. Providing a film tensioning device. SOLUTION: At least two vertically oriented guide rollers which are in contact with one surface of the heat-sealed packaging film are rotatably provided, and the other surface of the packaging film is provided between the guide rollers. A tension roller that presses the film is freely movable forward and backward with respect to the film, and the advance and retreat position of the tension roller is adjusted to freely adjust the tension of the packaging film to be heat-sealed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a film tensioning device in a bag making device.

[0002]

[Prior art]

 A bag-making apparatus according to the present invention disclosed in Japanese Patent Application Laid-Open No. 9-150805 is a vertical sealing device in which a packaging film wound in a roll shape is folded in two with its side edge upward in the longitudinal direction. And heat-sealed for each fixed bag width to make uncut continuous bags, which are intermittently fed by the film feed mechanism, and the vertical seal part is cut by the cutter device to form one bag. Have been. The packaging film is fed out while being tensioned by a dancing roller of a film supply mechanism. However, there is no device other than the dancing roller for finely adjusting the tension of the film.

[0003]

[Problems to be solved by the invention]

 It is preferable that the left and right vertical seals have the same width in the manufactured bag, and if the seals are not uniform, the appearance is poor, and the bag is treated as a defective product. By the way, the degree of expansion and contraction of the packaging film varies depending on the type of the material, and the degree of expansion and contraction of the film during bag making is uniform depending on the temperature of the storage location of the refilled film and the ambient temperature of the bag making equipment. is not. Therefore, if heat sealing is applied to a film having such a property at a position deviated from a regular position, an error corresponding to several bags from the vertical sealing device to the cutter device is cumulatively increased. As a result, the center portion of the width of the vertical seal cannot be cut by the cutter, and the cutting is performed at a position deviated from the center portion, resulting in a bag having an uneven width of the vertical seal shown in FIG. Inconvenience. The position where the vertical seal is applied is adjusted by moving the vertical seal body in either the film feed direction or the reverse direction. The adjustment work is cumbersome and not easy. In addition, since the vertical seal body is composed of two or three sets of a preheating seal, a main seal, and a cooling step of the seal portion, a considerable number of defective bags are generated during the adjustment. Therefore, some measures to easily fine-tune the position of the vertical seal have been desired.

An object of the present invention is to provide a function of pulling the packaging film in the feed direction or returning the film in the reverse direction in order to finely adjust the position in the width direction of the vertical seal applied to the uncut continuous bags. An object of the present invention is to provide a film tensioning device in a bag making device.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 folds the packaging film wound in a roll shape into two pieces with the side edges upward in the longitudinal direction, and optionally applies a bottom seal at the bent portion. At the same time, heat sealing is performed for each fixed bag width by the vertical sealing device to form uncut continuous bags, which are intermittently fed by the film feed mechanism, and when the feeding of the film is stopped, the vertical sealing is performed by the cutter device. In a bag making apparatus in which a portion is cut into individual bags, at least two vertically oriented guide rollers that are in contact with one surface of the heat-sealed packaging film are rotatably provided. Between these guide rollers, a tension roller that presses the other surface of the packaging film is provided freely to advance and retreat with respect to the film, and the advance and retreat position of the tension roller is adjusted. Accordingly, characterized in that adjusted freely configure the tension member if the packaging film wherein the heat seal is applied.

According to a second aspect of the present invention, in the film tensioning device in the bag making apparatus according to the first aspect, a lever having the tension roller rotatably provided at a free end thereof is provided with one of the guide rollers. The swing shaft is swingably supported on the vertical axis of the drawing, and the tension roller is configured to move forward and backward with respect to the packaging film by an adjusting shaft connected to the lever.

[0007]

[Actions and effects of the invention]

 By moving the tension roller forward and backward by rotating the adjustment shaft, the packaging film is pulled in the feed direction or returned in the opposite direction. This makes it possible to make fine adjustments to the position of the vertical seal applied to the film in the width direction, so that the width of the vertical seal of each formed bag is the same on both the left and right sides of the bag making apparatus. While operating or stop the operation as appropriate, perform adjustment work as appropriate.

The film tensioning device in the bag making device can quickly and easily adjust the position in the width direction of the vertical seal applied to uncut continuous bags even during operation or when operation is stopped. . As a result, this greatly contributes to the production of a good-quality bag in which the widths of the left and right vertical seals shown in FIG. 4 are uniform.

[0009]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is a plan view showing an outline of a bag making apparatus.

In the drawing, T is a film tensioning device in a bag making device, and a block 2 of a base 1 has two vertical guide rollers 5, 10, which are in contact with one surface of a packaging film f. The vertical axes 6 and 11 are fixed. The guide rollers 5 and 10 are rotatably provided by bearings 7 and 12, respectively. The levers 15 and 16 are swingably supported on a shaft portion 6 a of the vertical axis 6 protruding from the guide roller 5. Reference numeral 17 denotes a collar for preventing the lever 16 from coming off. At the free ends of the levers 15 and 16, the longitudinal axis 21 of a tension roller 20 for pressing the other surface of the film f is fixed, and the roller 20 is rotatably provided. Reference numeral 22 denotes an arm provided on the lower lever 15, and one end 31 a of a rod 31 described later is attached to the protruding end 22 a of the arm 22.

A support block 26, 27 is provided on a side surface 25 a of a stand 25 provided on the base 1, and the adjustment shaft 28 is supported by the blocks 26, 27 in a vertical direction and freely rotatable. Reference numeral 29 denotes a knob fixed to the upper end of the adjustment shaft 28. A nut 30 is screwed into a male screw 28a between the support blocks 26 and 27 of the adjustment shaft 28, and a fork 32 of a rod 31 is fitted to the nut 30 so as to be swingable. By rotating the knob 29 to operate the rod 31, the levers 15 and 16 are swung, and the tension roller 20 is provided so as to advance and retreat with respect to the packaging film f.

The film tensioning device T in the bag making device having such a configuration is installed in a bag making device B as shown in FIG. The outline of the bag making apparatus B is as follows: a film supply mechanism i for feeding out a film f wound into a roll, a forming means ii for folding the film f into two pieces with the side edge thereof in the longitudinal direction, and A bottom sealing device iii for heat-sealing the bottom portion of the film f bent by the forming means ii, a vertical sealing device iv for heat-sealing the vertical portion of the film f, and an uncut continuous bag intermittently. It consists of a film feed mechanism v for feeding and a cutter device vi for cutting the central part of the vertical seal of continuous bags to make each bag.

The operation of the film tensioning device T has been described in the section of the operation of the present invention, and will not be described.

According to the film tensioning device in the bag making apparatus, fine adjustment of the width direction of the vertical seal applied to the uncut continuous bags is easily performed even during operation or when operation is stopped. It became possible.

[Brief description of the drawings]

FIG. 1 is a plan view

FIG. 2 is a front view

FIG. 3 is a plan view showing an outline of a bag making apparatus.

FIG. 4 is an explanatory view of a non-defective bag in which left and right vertical seals have the same width.

FIG. 5 is an explanatory view of a bag of a defective product in which the width of the vertical seal is not uniform.

[Explanation of symbols]

B → Bag making device T → Film tensioning device f → Packaging film 5,10 → Guide roller 6 → Vertical axis 15,16 → Lever 20 → Tension roller 28 → Adjustment axis

Claims (2)

[Utility model registration claims] 1. A packaging film wound in a roll shape is folded in two with its side edge upward in a longitudinal direction, a bottom seal of a bent portion is arbitrarily applied, and a vertical bagging device is used for every fixed bag width. The film is heat-sealed to form an uncut continuous bag, which is intermittently fed by a film feed mechanism, and when the feeding of the film is stopped, the vertical seal portion is cut by a cutter device to form a single bag. In the bag device, at least two vertically oriented guide rollers that are in contact with one surface of the heat-sealed packaging film are rotatably provided, and the other of the packaging films is provided between the guide rollers. A tension roller for pressing the surface is provided to freely advance and retreat with respect to the film, and the advancing and retreating position of the tension roller is adjusted. A film tensioning device in a bag making device, characterized in that the film tension can be adjusted freely. 2. A lever provided with a freely rotatable tension roller at a free end thereof is swingably supported on a longitudinal axis of any one of the guide rollers, and the tension roller is controlled by an adjusting shaft connected to the lever. The film tensioning device according to claim 1, wherein the film tensioning device is configured to advance and retreat with respect to the packaging film.