This application claims priority of Taiwanese Application No. 101210343, filed on May 30, 2012.
1. Field of the Invention
The invention relates to a bag making machine, more particularly to a fully automatic bag making machine.
2. Description of the Related Art
Referring to
However, the process of fabricating the fabric bags 4 has not finished by then since each of the tubular pieces 3 still has opposite openings. It is necessary to transport the stack of tubular pieces 3 to another manufacturing site for sewing manually bottom openings of the tubular pieces 3 to form the fabric bags 4.
The conventional bag making machine 10 is capable of forming a continuous fabric sheet 1 into a plurality of tubular pieces 3. However, the entire process of fabricating the fabric bags 4 needs to be divided into two parts since manual sewing takes longer time than making the tubular pieces 3 and cannot be synchronized with the operation of the conventional bag making machine 10. The two-part fabricating process is laborious and time-consuming.
Referring to
Therefore, the object of the present invention is to provide a fully automatic bag making machine.
Accordingly, a bag making machine of the present invention comprises:
a feeder having a least one roller to unwind and feed a sheet in a first direction;
a forming device including
a speed controller including
a cutter disposed downstream of and in line with the speed controller to cut the tubular body into a plurality of tubular pieces;
a direction changing device including a conveying unit that is disposed downstream of the cutter to change a direction of advancement of the tubular pieces so that the tubular pieces are advanced in a second direction substantially perpendicular to the first direction;
a sewing device disposed downstream of and in line with the conveying unit in the second direction to sew and close a bottom side of each of the tubular pieces, which is open; and
a sealing device including
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
The present invention is directed to a bag making machine usable for making fabric bags. The preferred embodiment of the bag making machine according to the present invention is a fully automatic bag making machine capable of fabricating tubular bags from a fabric or paper sheet. Referring to
As shown in
The feeder 30 has a frame 31 and a roller 32 mounted on the frame 31 to unwind and feed a fabric sheet 300 in a first direction (X). In this embodiment, the fabric sheet 300 is a polypropylene (PP) sheet. For fabricating the paper bag 900 (see
The printing device 40 includes a printer 41 that is disposed in proximity to the feeder 30 to guide advancement of the fabric sheet 300 in the first direction (X) and to print a pattern on a surface of the fabric sheet 300.
The coating device 50 includes a support 51 disposed downstream of and in line with the printing device 40 to guide advancement of the fabric sheet 300, a coating extruder 52 disposed in proximity to the support 51 to supply an anti-slip coating material, and a coater 53 connected to the coating extruder 52 to apply the anti-slip coating material to the surface of the fabric sheet 300.
Referring further to
Referring back to
In the aforesaid upstream machine section of the preferred embodiment, the tubular body 400 is conveyed continuously and uninterruptedly. However, in the following downstream machine section of the preferred embodiment, the advancement of the tubular body 400 is intermittent because of the cutting operation, in which bag pieces are conveyed in a discrete manner. Because the upstream and downstream speeds at the upstream and downstream machine sections are different, the speed controller 70 is disposed therebetween for conditioning the upstream and downstream speeds of the advancement of the tubular body 400.
The speed controller 70 includes a buffer frame 71 that is disposed downstream of and in line with the forming device 60 to guide advancement of the tubular body 400, and a buffer device 72 that is mounted on the buffer frame 71 to control the upstream and downstream speeds of advancement of the tubular body 400 at upstream and downstream sides of the speed controller 70. The buffer device 72 includes a plurality of upper rollers 721 connected pivotally to an upper part of the buffer frame 71, and a plurality of translationally movable lower rollers 722 disposed below the upper rollers 721 and on a lower part of the buffer frame 71. The tubular body 400 is wound alternatively around the upper and lower rollers 721, 722. The lower rollers 722 move downward to displace away from the upper rollers 721 when the upstream speed is greater than the downstream speed of the advancement of the tubular body 400, and move upward to displace toward the upper rollers 721 when the upstream speed is smaller than the downstream speed of the advancement of the tubular body 400.
When a system (not shown) of the speed controller 70 detects that a downward movement of the lower rollers 722 reaches a predetermined lower level, the upstream speed of advancement of the tubular body 400 is decreased. When the system detects that an upward movement of the lower rollers 722 reaches a predetermined upper level, the upstream speed of advancement of the tubular body 400 is increased to surpass the downstream speed. The upstream and downstream speeds of advancement for the tubular body 400 are therefore regulated.
The cutter 80 includes a cutting unit 81 that is disposed downstream of and in line with the speed controller 70. Upper and lower cutting blades are utilized to shear the tubular body 400 into a plurality of tubular pieces 500, each of which has opposite openings 501 (see
The direction changing device 90 includes a conveying unit 91 that is disposed downstream of the cutter 80 and that changes a conveying direction of the tubular pieces 500 to turn by an angle of 90 degrees so that the tubular pieces 500 are advanced in a second direction (Y) substantially perpendicular to the first direction (X). When each tubular piece 500 reaches the conveying unit 91, one of the openings 501 of the tubular piece 500 is oriented to face toward a lateral side of the direction changing device 90.
The sewing device 100 includes a sewing unit 110 that is disposed downstream of and in line with the conveying unit 91 in the second direction (Y) to sew and close said one of the openings 501 of each of the tubular pieces 500, such that the tubular pieces 500 are formed into bags 600, each of which has a sewed portion 601 (see
The sealing device 200 includes a tape supply unit 210 that is disposed downstream of and in line with the sewing device 100, a plurality of hot press units 220 that are disposed downstream of and in line with the tape supply unit 210, and a tape cutting unit 230 that is disposed downstream of and in line with the hot press units 220. Referring to
The bag making machine may further comprise a counter (not shown) at a downstream side of the sealing device 200 to count the number of the fabric bags 800 fabricated by the bag making machine.
During the operations of the feeder 30, the printing device 40 and the forming device 60, an outer surface of the fabric sheet 300 is directed downward. However, in the coating device 50, because the outer surface of the fabric sheet 300 needs to face upward so as to be coated with the anti-slip layer 301, a surface reversing operation must be performed to reverse the outer surface of the fabric sheet 300.
Referring to
For fabricating paper bags 900, no anti-slip layer is needed on the outer surface of the paper sheet. Therefore, when a paper sheet enters the coating device 50, the operator may control the coating applicator head 532 to stop spraying the anti-slip coating material and control the contact roller 514 to move away from the cooling roller 513.
To sum up, the bag making machine of this invention provides a fully automated production line for fabricating fabric bags 800 or paper bags 900. When the fabric bags 800 are produced, the coating device 50 may be controlled to supply the anti-slip coating material to the outer surface of the flat sheet 300. When the paper bags 900 are produced, the coating device 50 does not supply the anti-slip coating material to the outer surface of the paper sheet. The production capacity of the bag making machine is enhanced and the cost of manual operation is reduced.
While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Number | Date | Country | Kind |
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101210343 | May 2012 | TW | national |