Suction device for bag making machine

Abstract

To provide a suction device for a bag making machine that uses a single Roots pump instead of multiple pumps by optimizing the piping system and reduces problems when pulling out sheets of paper. [Solution] Only one Roots pump is used as the suction pump 22. The piping device 23 comprises a main pipe 31, one end of which is connected to the pump and the other end of which is connected to the feed roll, a secondary pipe 32 connected to the main pipe 31, and a branch pipe 33 connected to the secondary pipe 32. The branch pipe 33 is provided with joints 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h to which multiple pipes 36a, 36b, 36c, 36d, 36e, 36f, 36g, and 36h, which are connected to multiple feed rolls, are connected.

Description

[Technical Field]

[0001] The present invention relates to a suction device for a bag making machine, and more particularly to a suction device suitable for a bag making machine that makes paper envelopes of various thicknesses and shapes. [Background technology]

[0002] A bag making machine is a machine for making bags of various shapes using paper or plastic packaging materials, and in recent years, from the perspective of environmental protection, it has been increasingly used to make paper envelopes.

[0003] A bag making machine (1) for making paper envelopes folds pre-cut paper sheets several times into the predetermined outline shape of the envelope and glues them together to make the envelope. For example, as shown in Figure 4, the machine is equipped with a stacking section (2) on which paper sheets (P) that will be used to make the envelopes are stacked, a feed roll (3) that pulls out the paper sheets (P) one by one from the stacking section (2) and sends them downstream, a number of feed rolls (4), (5), (6), (7), (8), and (9) that send the paper sheets (P) received from the feed roll (3) to the downstream process, and a number of pressure rolls (10), (11) that press the paper sheets against the required feed rolls (6), (8).

[0004] In the bag making machine (1), the function, shape, number, etc. of rolls (4), (5), (6), (7), (8), (9), (10), and (11) are changed depending on the application, and by using a creasing roll (10), a first folding roll (7), a body glue roll (8), a second folding roll (9), a glue plate roll (11), etc., the paper sheets (P) are made into envelopes and sent out from the conveying section (12).

[0005] Here, the feed roll (3) and the conveying rolls (4), (5), (6), (7), (8), and (9) of the bag making machine (1) need to suck up the paper sheets (P) used as the envelope material, and a known example of such a suction roll is a suction roll (paper sheet transport roll) as shown in Patent Document 1.

[0006] To suck the feed roll 3 and the feed rolls 4, 5, 6, 7, 8, and 9, a suction device 41 shown in Fig. 5 is required. In the conventional suction device 41 for a bag making machine shown in Fig. 5, approximately half of the pumps 51, 52, and 53 are used for the feed roll 3 and the plurality of feed rolls 4, 5, 6, 7, 8, and 9, and each pump 51, 52, and 53 is connected to the feed roll 3 and the plurality of feed rolls 4, 5, 6, 7, 8, and 9 of the bag making machine 1 by the required piping 61, 62, 63a, 63b, 64, 65a, and 65b.

[0007] That is, the pumps (51), (52), and (53) include, for example, a first pump (51) that sucks the feed roll (3), a second pump (52) that sucks the first and second feed rolls (4) and (5), and an m-th pump (53) that sucks the (n-1)th and n-th feed rolls (8) and (9). For example, the feed roll (3) and the first pump (51) are connected by one main pipe (61), and the first and second feed rolls (4) and (5) and the second pump (52) are connected by the main pipe (62) and two branch pipes (63a) and (63b).

[0008] As a pump, a roots pump is well known (see Patent Document 2, etc.). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-30916 [Patent Document 2] Japanese Patent Application Publication No. 2024-143723 Summary of the Invention [Problem to be solved by the invention]

[0010] In the conventional bag making machine (1) shown in Figure 5, multiple suction pumps (non-Roots type) (51), (52), and (53) are connected to multiple feed rolls (4), (5), (6), (7), (8), and (9), and it was not considered possible to use a single suction pump (51), (52), and (53) for multiple feed rolls (4), (5), (6), (7), (8), and (9). This naturally increased equipment costs, and as a result, costs such as electricity costs became significant.

[0011] Conventionally, the biggest challenge for the suction device 41 has been to pull out the required paper sheets P one by one from the stacking section 2 using the feed roll 3, and if the paper sheets P can be transferred from the feed roll 3 to the first feed roll 8, subsequent problems are extremely rare. Note that, hereinafter, the feed roll 3 will be distinguished from the other feed rolls 4, 5, 6, 7, 8, and 9, and the other feed rolls 4, 5, 6, 7, 8, and 9 will be referred to simply as feed rolls 4, 5, 6, 7, 8, and 9, without consideration of their function or shape.

[0012] The object of this invention, which has been made in view of the above-mentioned problems, is to provide a suction device for a bag making machine which, by optimizing the piping system, allows the use of a single Roots pump instead of multiple pumps and reduces problems when drawing out sheets of paper. [Means for solving the problem]

[0013] In order to achieve the above object, this invention comprises the following aspects. 1) A suction device for a bag making machine that is installed in a bag making machine equipped with a feed roll that pulls out sheets of paper that will become envelope material one by one from a stacking section where the sheets are piled up, and multiple feed rolls that send the sheets to a downstream process to complete bag making, and that sucks the feed roll and the multiple feed rolls, characterized in that the suction pump is a single Roots pump, and the piping device consists of a main pipe that is connected at one end to the pump and at the other end to the feed roll, a secondary pipe that is connected to the main pipe, and a branch pipe that is connected to the secondary pipe, and the branch pipe is provided with a joint to which the multiple pipes that are connected to the multiple feed rolls are connected. 2) The suction device for a bag making machine according to 1) above, characterized in that the main pipe extends vertically and is provided at one end with a pump joint for connecting a pipe connected to the suction port of the suction pump and at the other end with a feed roll joint for connecting a pipe connected to the suction port of the feed roll; the secondary pipe consists of a horizontal section connected at one end to the main pipe and a vertical section connected to the other end of the horizontal section; the branch pipes are H-shaped in a horizontal view and consist of a horizontal first branch section connected at the center to the end of the vertical section of the secondary pipe and second and third branch sections connected to both ends of the first branch section, and the joints of the branch pipes are provided at required intervals on the second and third branch sections. 3) A suction device for a bag making machine as described in 2) above, in which the lower end of a T-shaped joint consisting of a vertical section with both ends open and a horizontal section with one end connected to the vertical section and the other open is connected to each joint of a branch pipe, a valve is provided at the upper end of the vertical section of the T-shaped joint so that this valve and each pipe can be connected via the joint, and a pressure gauge is provided at the open end of the horizontal section of the T-shaped joint via an L-shaped joint. [Effects of the Invention]

[0014] According to the suction device for a bag making machine described in 1) above, the use of multiple suction pumps for the feed roll and multiple feed rolls can be replaced with a single Roots pump, thereby significantly reducing costs for equipment and electricity. The biggest challenge here is how to pull out the required paper sheets one by one from the stacking section using the feed roll, but this can be overcome by using a three-stage piping structure consisting of a main pipe, a sub-pipe, and multiple branch pipes.

[0015] According to the suction device for a bag making machine described in 2) above, the piping device can be optimized.

[0016] According to the suction device for a bag making machine of the above 3), the burden of adjustment on the bag making machine side can be reduced. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing one embodiment of a pump and piping of a suction device for a bag making machine according to the present invention. FIG. [Figure 2] 1 is a schematic diagram showing one embodiment of the piping of a suction device for a bag making machine according to the present invention; [Figure 3] 10 is a schematic view showing another embodiment of the piping of the suction device for the bag making machine of the present invention. FIG. [Figure 4] FIG. 1 is a diagram schematically illustrating the appearance of a conventional bag making machine. [Figure 5] FIG. 1 is a diagram schematically illustrating an example of a pump and piping of a conventional suction device for a bag-making machine. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a suction device for a bag making machine according to the present invention will now be described with reference to the drawings.

[0019] FIG. 1 is a diagram showing a schematic diagram of a pump (22) and a piping device (23) of a suction device (21) for a bag making machine according to an embodiment of the present invention. Compared with the conventional suction device (41) for a bag making machine shown in FIG. 5, the number of pumps (42), (43), (44), and (45) is m (multiple) in the suction device (41) for a bag making machine shown in FIG. 5, whereas in this embodiment, there is only one pump, as indicated by the symbol (22).

[0020] Here, the pump (22) is a Roots-type fluid machine used as a pump. Roots-type fluid machines are well known and consist of a pair of rotors with two or three blades mounted on two parallel shafts. These rotors rotate at equal speeds in opposite directions, maintaining a small gap between the rotors and the inside of an oval casing. A fixed volume of gas trapped between the casing and rotors is drawn in through one port and discharged through the other port, allowing the machine to be used not only as a pump but also as a blower. In this embodiment, the machine is used as a pump (vacuum pump).

[0021] The piping device 23 is composed of a main pipe 31, indicated by a thick line, having one end connected to the pump 22 and the other end connected to the feed roll 3 of the bag-making machine 1, a secondary pipe 32, indicated by a thick line, connected to the main pipe 31, and a branch pipe 33, indicated by a thin line, connected to the secondary pipe 32. That is, while the piping of the conventional suction device 41 shown in Fig. 5 has a one- or two-stage structure consisting of only the main pipe 61 or main pipes 62, 64 and branch pipes 63a, 63b, 65a, 65b, the piping device 23 of the embodiment has a three-stage structure consisting of the main pipe 31, secondary pipe 32, and branch pipe 33.

[0022] As shown in more detail in Figure 2, the main pipe (31) extends vertically, and is provided at one end with a pump joint (31a) for connecting a pipe (35a) connected to the suction port of the pump (22), and at the other end with a feed roll joint (31b) for connecting a pipe (35b) connected to the suction port of the feed roll (3) of the bag making machine (1).

[0023] The secondary pipe (32) has an inverted L-shape in front view and is made up of a horizontal section (32a) connected at one end to the main pipe (31) and a vertical section (32b) continuing to the other end of the horizontal section (32a). When the main pipe (31) is sucked by the pump (22), the vertical section (32b) of the secondary pipe (32) is sucked by the pump (22) via the horizontal section (32a). The diameter of the secondary pipe (32) is the same as the diameter of the main pipe (31).

[0024] The branch pipe (33) is H-shaped in a horizontal view and consists of a horizontal first branch portion (33a) connected in the center to the end of the vertical portion (32b) of the secondary pipe (32), and second and third branch portions (33b) and (33c) connected to both ends of the first branch portion (33a), respectively.

[0025] The second and third branch portions (33b) and (33c) are each provided with four joint portions (34a), (34b), (34c), (34d), (34e), (34f), (34g), and (34h) at equal intervals. Each joint portion (34a), (34b), (34c), (34d), (34e), (34f), (34g), and (34h) are connected to the joint portions on the side of the plurality of feed rolls (4), (5), (6), (7), (8), and (9) by pipes (36a), (36b), (36c), (36d), (36e), (36f), (36g), and (36h), so that up to eight feed rolls can be sucked in.

[0026] According to the branch pipe (33) of this embodiment, the balance of suction forces can be properly achieved, and the suction force of the feed roll (3) via the main pipe (31) can be secured, and the suction force of the multiple feed rolls (4), (5), (6), (7), (8), and (9) can be secured via the branch pipe (33). As a result, unlike the conventional system which requires multiple pumps, it is now possible to properly suction all of the feed rolls (4), (5), (6), (7), (8), and (9) with a single pump (22).

[0027] In FIG. 2, the tubes 36a, 36b, 36c, 36d, 36e, 36f, 36g, and 36h on the bag-making machine side are directly connected to the respective joints 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h of the branch pipe 33. However, instead of this, it is more preferable to provide valves 38 and pressure gauges 41 using appropriate joints 37, 39, and 40 for all of the joints 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h of the branch pipe 33 of the piping device 23, as shown in FIG. 3.

[0028] 3, a T-shaped joint 37 includes a vertical section 37a that is open at both ends and a horizontal section 37b that has one end connected to the center of the vertical section 37a and the other end that is open. The lower end of the vertical section 37a is connected to each of the joints 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h (joint 34h is shown in the figure) of the branch pipe 33. A valve 38 is provided at the upper end of the vertical section 37a of the T-shaped joint 37, and the valve 38 can be connected to each of the pipes 36a, 36b, 36c, 36d, 36e, 36f, 36g, and 36h (pipe 36h is shown in the figure) via joints 39. Furthermore, a pressure gauge (41) is provided at the end of the horizontal part (37b) of the T-shaped joint (37) via an L-shaped joint (40).

[0029] In this way, by operating the opening adjustment handle (38a) of the valve (38) while watching the pressure gauge (41), necessary adjustments can be made on the suction device (21) side, thereby reducing the adjustment burden on the bag-making machine (1) side. [Explanation of symbols]

[0030] (1): Bag making machine (3): Feed roll (21):Suction device for bag making machine (22): Pump (23): Piping equipment (31):Superintendent (31a): Pump joint (31b): Feed roll joint (32):Auxiliary pipe (32a):Horizontal part (32b):Vertical part (33): Branch pipe (33a): First branch (33b): Second branch (33c): Third branch (34a)(34b)(34c)(34d)(34e)(34f)(34g)(34h): Joint (35a)(35b):Pipe (36a)(36b)(36c)(36d)(36e)(36f)(36g)(36h):Pipe (37): T-shaped joint (37a);Vertical part (37b):Horizontal part (38): Valve (39): Joint (40): L-shaped joint (41): Pressure gauge

Claims

1. A suction device for a bag making machine is provided in the bag making machine, which is equipped with a feed roll that pulls out sheets of paper that are material for envelopes one by one from a stacking section in which the sheets are piled up, and a plurality of feed rolls that feed the sheets to a downstream process to complete bag making, and which sucks the feed roll and the plurality of feed rolls, There is only one Roots pump for suction, A suction device for a bag making machine, characterized in that the piping device comprises a main pipe having one end connected to a pump and the other end connected to a feed roll, a secondary pipe connected to the main pipe, and a branch pipe connected to the secondary pipe, and the branch pipe is provided with joints to which multiple pipes connected to multiple feed rolls are connected.

2. the main pipe extends vertically, and is provided at one end with a pump joint for connecting a pipe connected to a suction port of the suction pump, and at the other end with a feed roll joint for connecting a pipe connected to a suction port of the feed roll; The secondary pipe comprises a horizontal section connected to the main pipe at one end and a vertical section connected to the other end of the horizontal section, 2. The suction device for a bag making machine according to claim 1, wherein the branch pipe has an H-shape in a horizontal view, and is composed of a horizontal first branch portion connected to the vertical end of the secondary pipe at its center, and second and third branch portions connected to both ends of the first branch portion, respectively, and each joint portion of the branch pipe is provided at a required interval on the second and third branch portions.

3. 3. The suction device for a bag making machine of claim 2, wherein the lower end of the vertical section of a T-shaped joint, which is composed of a vertical section having open ends and a horizontal section having one end connected to the vertical section and the other open, is connected to each of the joints of the branch pipes, a valve is provided at the upper end of the vertical section of the T-shaped joint so that this valve can be connected to each of the pipes connected to the plurality of feed rolls via the joints, and a pressure gauge is provided at the open end of the horizontal section of the T-shaped joint via an L-shaped joint.

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