CN111515698A

CN111515698A - Product processing machine and tool pushing device thereof

Info

Publication number: CN111515698A
Application number: CN201910104777.5A
Authority: CN
Inventors: 吴秀英
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-02-01
Filing date: 2019-02-01
Publication date: 2020-08-11

Abstract

A product processing machine and its tool pushing device, the product processing machine includes a tool pushing device and multiple workstations; the tool pushing device comprises a tool loop, five pushing units and a plurality of tools; the tool loop is rectangular and comprises two rails, the tools are arranged on the two rails, and the number of the tools on one rail is at least two less than that of the tools on the other rail; the five pushing units can drive the tools to perform rectangular circulating movement along the tool loop, and by means of the difference between the tools on the two rails and the configuration of the action of the pushing units, when the tools move to a specific section, the tools can stay in batches for a long time and then are driven in batches, and the stay time of the tools in each work station can be configured according to the process time difference of the processing stations.

Description

Product processing machine and tool pushing device thereof

Technical Field

The present invention relates to a product processing machine, and more particularly to a product processing machine having a tool moving device for driving a tool to move in a circular manner.

Background

The existing product processing machine mainly comprises a production line and a plurality of workstations, wherein the workstations are arranged along the production line at intervals, and the production line is utilized to drive tools to move, so that parts and semi-finished products can be driven to each workstation to be processed along with the tools by the production line.

However, the production line of the conventional product processing machine is linear, so that the product processing machine has a long extension length, and the tool needs to be recycled after the production is finished, which is troublesome; in addition, the processing time required by each workstation may be different, for example, when a part is bonded by dispensing, a pressing process is usually required to accelerate the time for bonding the part, but during pressing, the tool needs to be left for a period of time to wait for the dispensing and curing, so that the tool stays in the workstation of the pressing process for a longer time, the whole production line needs to move in accordance with the processing time of the workstation of the pressing process, the machine of other workstations is stopped for a longer time, and the processing time of the product is prolonged and needs to be improved.

Disclosure of Invention

In view of the above, the present invention provides a product processing machine and a tool moving device thereof, wherein the tool moving device is mainly used to drive a tool to perform a cyclic displacement, so that the tool directly enters a next production cycle after one production is finished.

It is another object of the present invention to provide a product processor that can configure the time that tools remain at each station.

The invention provides a product processing machine, which comprises a tool pushing device and a plurality of work stations, wherein:

the tool pushing device comprises a base, a tool loop, five pushing units and a plurality of tools;

the tool loop is arranged on the top surface of the base, is rectangular and comprises

Four sides respectively defined as a first side and a second side located on opposite sides, and a third side and a fourth side located on opposite sides and connecting the first side and the second side; and

two rails extending from the first side of the tool loop to the second side, and defining a rail close to the third side as a first rail and a rail close to the fourth side as a second rail;

the tools are arranged on the two rails of the tool loop, and the number of the tools arranged on the second rail is at least two less than that of the tools arranged on the first rail; and

the five pushing units are all arranged on the base and drive the tools to perform rectangular cyclic displacement along the tool loop, and the five pushing units are respectively defined as

The first pushing unit is positioned on the fourth side of the tool loop close to the first side and comprises a pushing piece capable of moving from the fourth side of the tool loop to the third side in a reciprocating way;

the second pushing unit is positioned at the first side of the tool loop close to the third side and comprises a pushing piece capable of reciprocating from the first side to the second side of the tool loop;

a third pushing unit located at the third side of the tool loop near the second side and including a pushing element capable of reciprocating from the third side to the fourth side of the tool loop;

a fourth pushing unit located at the second side of the tool loop near the fourth side, and including a pushing element capable of moving back and forth from the second side of the tool loop to the first side, wherein the pushing element of the fourth pushing unit is capable of performing short-range displacement and long-range displacement at intervals, and the long-range displacement is a multiple of the short-range displacement; and

a fifth pushing unit located between the fourth pushing unit and the first pushing unit and including a pushing element capable of reciprocating from the second side of the tool loop to the first side; and

the workstations are respectively arranged at the first track and the second track which are close to the tool loop.

The invention provides a tool pushing device of a product processing machine, which comprises a base, a tool loop, four pushing units and a plurality of tools, wherein:

the four pushing units are all arranged on the base and drive the tools to perform rectangular cyclic displacement along the tool loop, and the four pushing units are respectively defined as

a third pushing unit located at the third side of the tool loop near the second side and including a pushing element capable of reciprocating from the third side to the fourth side of the tool loop; and

the fourth pushing unit is located on the second side of the tool loop near the fourth side and comprises a pushing piece capable of moving from the second side of the tool loop to the first side in a reciprocating mode, the pushing piece of the fourth pushing unit can perform short-range displacement and long-range displacement at intervals, and the long-range movement distance is a multiple of the short-range movement distance.

The tool pushing device of the product processing machine further comprises a fifth pushing unit, wherein the fifth pushing unit is positioned between the fourth pushing unit and the first pushing unit and comprises a pushing piece capable of moving back and forth from the second side to the first side of the tool loop.

By the technical mode, the invention can achieve the following effect gains:

1. because the tool carries out rectangular cyclic displacement along the tool loop and the workstations are arranged at intervals along the tool loop, the tool can directly carry out the next production operation cycle after completing one production operation, and the length of the product processing machine can be shortened.

2. The tool is driven to perform rectangular cyclic displacement in the tool loop by the difference of the tools arranged on the two rails of the tool loop through the pushing units, and the pushing piece of the fourth pushing unit can perform short-range displacement and long-range displacement at intervals, so that when a plurality of tools are displaced to the middle section of the second rail, the tools are driven to displace in batches after being retained for a long time, and the tool retaining time of each workstation can be configured according to the process time difference of different workstations.

3. By means of the time difference of the tools staying at the workstations, when the workstations with shorter process time perform multiple actions, the workstations with longer process time can perform process operation on a plurality of tools at one time, so that the standby time of the machine is shortened, and the process time of products is shortened; compared with the existing product processing machine, the machine table of the workstation does not need to move along the two rails, so that the machine table of the processing station can move more simply.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a perspective external view of a product processor of the present invention;

FIG. 2 is a top view of the product processor of the present invention;

FIG. 3 is a perspective view of a tool pushing device of the product processor of the present invention;

FIG. 4 is a top view of a tool pusher arrangement of the product processor of the present invention;

FIG. 5 is a top view of the tool pusher shoe of the product processor of the present invention without a tool positioned therein;

FIGS. 6-10 are schematic views of the operation of the tool-moving device of the product processor of the present invention;

FIG. 11 is a schematic process diagram of station A of the product processor of the present invention;

FIG. 12 is a schematic process diagram of station B of the product processor of the present invention;

FIG. 13 is a schematic process view of station C of the product processor of the present invention;

FIG. 14 is a process schematic of workstation D of the product processor of the present invention;

FIG. 15 is a schematic process side view of station E of the product processor of the present invention;

FIG. 16 is a schematic top view of a process of station E of the product processor of the present invention;

fig. 17 is a process schematic of a workstation F of the product processor of the present invention.

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

referring to fig. 1 and 2 in combination, a preferred embodiment of the product processor of the present invention includes a tool-moving apparatus 100 and a plurality of workstations A, B, C, D, E, F.

Referring to fig. 3 and 4, the tool pushing apparatus 100 includes a base 10, a tool loop 20, five pushing

units

31, 32, 33, 34, 35, and a plurality of tools 50. The tool loop 20 is disposed on the top surface of the base 10, and has a rectangular shape including four sides and two

rails

21 and 22. The four sides are respectively defined as a first side 201, a second side 202, a third side 203 and a fourth side 204, the first side 201 and the second side 202 are located at opposite sides, and the third side 203 and the fourth side 204 are located at opposite sides and connect the first side 201 and the second side 202; the two

rails

21, 22 extend from the first side 201 to the second side 202 of the tool loop 20, and are respectively defined as a first rail 21 and a second rail 22, the first rail 21 is located near the third side 203, and the second rail 22 is located near the fourth side 204.

The tools 50 are arranged on the two

rails

21, 22 of the tool loop 20, and the number of the tools 50 arranged on the second rail 22 is at least two less than the number of the tools 50 arranged on the first rail 21; referring to fig. 4 and 5, in the present embodiment, the first and

second tracks

21 and 22 both have tool spaces capable of accommodating 18 tools 50 arranged in sequence, the second track 22 defines tool spaces numbered 1 to 18 in sequence from the first side 201, the first track 21 defines tool spaces numbered 1 to 18 in sequence from the

second side

202, 17 tools 50 are arranged on the

first track

21, and 12 tools 50 are arranged on the second track 22.

Referring to fig. 3 to 5, the five pushing

units

31, 32, 33, 34, 35 are all disposed on the base 10 and are all connected to a control unit, and can be controlled by the control unit to move and drive the tools 50 to perform rectangular cyclic displacement along the tool loop 20. The pushing

units

31, 32, 33, 34, 35 are respectively defined as a first pushing unit 31, a second pushing unit 32, a third pushing unit 33, a fourth pushing unit 34, and a fifth pushing unit 35.

The first pushing unit 31 is located at the fourth side 204 of the tool loop 20 close to the first side 201, and includes a pushing element 313 that can move from the fourth side 204 of the tool loop 20 toward the third side 203, so as to push the tool 50 located in the 1 st tool space of the second track 22 toward the 18 th tool space of the first track 21; the second pushing unit 32 is located at the first side 201 of the tool loop 20 near the third side 203, and includes a pushing element 323 capable of moving from the first side 201 of the tool loop 20 to the second side 202, so as to push the tool 50 located on the first rail 21 to the second side 202; the third pushing unit 33 is located at the third side 203 of the tool loop 20 close to the second side 202, and comprises a pushing element 333 capable of moving from the third side 203 to the fourth side 204 of the tool loop 20 to push the tool 50 located in the 1 st tool space of the first track 21 to the 18 th tool space of the second track 22;

the fourth pushing unit 34 is located at the second side 202 of the tool loop 20 near the fourth side 204, and includes a pushing element 343 capable of reciprocating from the second side 202 of the tool loop 20 toward the first side 201, and the pushing element 343 of the fourth pushing unit 34 can perform short-range displacement and long-range displacement at intervals, the moving distance of the short-range displacement is equal to the moving distance of the pushing element 313 of the first pushing unit 31, the long-range movement distance is a multiple of the short-range movement distance, and the tool 50 located in the 18 th tool space of the second track 22 can be pushed one tool space and a plurality of tool spaces toward the first side 201 at intervals; the fifth pushing unit 35 is disposed between the fourth pushing unit 34 and the first pushing unit 31, and includes a pushing element 353 capable of moving back and forth from the second side 202 of the tool loop 20 to the first side 201, in this embodiment, the pushing element 353 of the fifth pushing unit 35 is disposed near the 6 th tool space of the second track 22, so as to push the tools 50 arranged in the 2 nd to 6 th tool spaces of the second track 22 to the first side 201.

The tool loop 20 has openings at the positions of the

push buttons

313, 323, 333, 343 corresponding to the first, second, third, and

fourth push units

31, 32, 33, 34, so that the

push buttons

313, 323, 333, 343 enter the tool loop 20 from the outside of the tool loop 20 to push the tool 50; the first side 201 and the second side 202 of the tool loop 20 are respectively provided with a

stop

23, 24, the rail 211 of the first rail 21 near the third side 203 extends toward the first side 201, and the rail 221 of the second rail 22 near the fourth side 204 extends toward the second side 202, so as to form a retaining wall when the pushing

members

313, 323, 333, 343, 353 of the pushing

units

31, 32, 33, 34, 35 push the tool 50.

Preferably, the tool pushing device 100 is further provided with a plurality of

sensing units

40, 40A, the

sensing units

40, 40A respectively sense whether there is a tool 50 at the predetermined positions of the first and

second tracks

21, 22 towards the first and

second tracks

21, 22, so as to provide a control unit for determining, controlling the pushing

units

31, 32, 33, 34, 35 to operate, and determining that the pushing member 343 of the fourth pushing unit 34 should perform short-range displacement or long-range displacement; in the present embodiment, the

sensing units

40 and 40A respectively sense the 1 st and 18 th tool spaces of the first track 21 and the 1 st, 13 th and 18 th tool spaces of the second track 22.

Preferably, the base 10 is provided with a long groove 11 extending along the second rail 22 corresponding to the second rail 22, the long groove 11 is located near the second side 202, and the pushing member 343 of the fourth pushing unit 34 is disposed in the long groove 11; as shown in fig. 9, the base 10 may also be provided with another long groove 12 extending along the second rail 22, the long groove 12 is located near the first side 201, so that the pushing element 353 of the fifth pushing unit 35 is disposed in the long groove 12, and the

seat bodies

341 and 351 of the fourth and fifth pushing

units

34 and 35 are both disposed on the bottom surface of the base 10, thereby reducing the space occupied by the machine; the bottom surface of the tool 50 may be recessed with a recess 51, such that the pushing element 353 of the fifth pushing unit 35 can extend into the recess 51 of the tool 50 to push the tool 50.

The operation flow of the tool pushing device 100 is as follows:

1. referring to fig. 4, in order to arrange the tools 50 at the initial positions of the

tool pushing device

100, 17 tools 50 arranged on the first track 21 are sequentially placed in the spaces 1-17 of the first track 21; the 12 tools 50 arranged in the second track 22 are sequentially placed in the 1 st-12 th tool spaces of the second track 22.

2. Referring to fig. 4 and 6, when the tool 50 is in the 1 st tool space of the second track 22 and the tool 50 is out of the 18 th tool space of the first track 21, the pushing member 313 of the first pushing unit 31 pushes the tool 50 in the 1 st tool space of the second track 22 to the 18 th tool space of the first track 21; when the 1 st tool space of the first rail 21 has the tool 50 and the 18 th tool space of the second rail 22 has no tool 50, the pushing member 333 of the third pushing unit 33 pushes the tool 50 located in the 1 st tool space of the first rail 21 to the 18 th tool space of the second rail 22.

3. Referring to fig. 6 and 7, when the 18 th tool space of the first track 21 has the tool 50, and the 1 st tool space has no tool 50, the pushing member 323 of the second pushing unit 32 pushes the tool 50 on the first track 21 to the second side 202; when the 18 th tool space of the second track 22 has the tool 50 and the 13 th tool space has no tool 50, the pushing member 343 of the fourth pushing unit 34 performs a short displacement to move the tool 50 located in the 18 th tool space of the second track 22 to the 17 th space; when the tool 50 is not present in the 1 st and 13 th spaces of the second rail 22, the fifth pushing unit 35 pushes the tool 50 located in the 2 nd to 6 th tool spaces of the second rail 22 to the first side 201, so that the six tools 50 located in the 7 th to 12 th tool spaces of the second rail 22 stay at the original positions.

4. Referring to fig. 8, since the second track 22 has no tool 50 in the 13 th tool space, the pushing

units

31, 32, 33, 34, 35 repeat the above-mentioned operation, so that the fourth pushing unit 34 continuously performs short-distance displacement, and pushes the tool 50 located in the 18 th tool space of the second track 22 forward by one frame, and drives the tool 50 located in front by one frame, the fifth pushing unit 35 continuously pushes the remaining tools 50 located in the 2 nd to 6 th tool spaces of the second track 22 forward, and when the other tools 50 are displaced, the tool 50 located in the 7 th to 12 th tool spaces of the second track 22 continuously stays at the original position.

5. Referring to fig. 9 and 10, when the tool spaces 13 to 18 of the two tracks 22 are filled with tools 50, at the same time, the tools 50 originally located in the tool spaces 1 to 6 of the second track 22 are pushed toward the first track 21, the fourth pushing unit 34 performs a long-distance displacement, the fifth pushing unit 35 does not operate, and the pushing member 343 of the fourth pushing unit 34 pushes the tools 50 arranged in the tool spaces 7 to 18 of the second track 22 to the tool spaces 1 to 12 one time, so that the arrangement of the tools 50 returns to the initial position of fig. 4, and continues another cycle.

The operation process of the tool pushing device 100 can be determined by the control unit by sensing whether there is a tool 50 at a specific position of the two

rails

21, 22 using the

sensing units

40, 40A, and controlling the pushing

units

31, 32, 33, 34, 35 to perform corresponding operations, or can be driven to move after staying for a long time in batch when a plurality of tools 50 are moved to the middle section of the second rail 22 by setting the operation intervals and sequence of the pushing

units

31, 32, 33, 34, 35 and performing a long-distance movement after a plurality of short-distance movements of the pushing member 343 of the fourth pushing unit 34.

Referring to fig. 1 and 2, the workstations A, B, C, D, E, F are respectively arranged in sequence near the first rail 21 and the second rail 22, a plurality of workstations A, B, C are spaced apart and disposed proximate the first track 21, a plurality of workstations D, E, F are spaced apart and disposed proximate the second track 22, by means of the above-mentioned operation process of the tool moving device 100, the tools 50 are driven to move to each workstation A, B, C, D, E, F in the tool loop 20 in sequence for product processing, and a work station E requiring a long process time can be provided at the middle section of the second rail 22, after the tools 50 are moved to the position, they are pushed again after staying for a long time, thereby, the dwell time of the tool 50 may be adjusted to match the process time differential of the workstation A, B, C, D, E, F.

The tool shifting device 100 may not include the fifth shifting unit 35, but only use the first, second, third and fourth shifting

units

31, 32, 33 and 34 to drive the tool 50 to perform rectangular cyclic displacement in the tool loop 20, and thus can be applied to a product processing machine that does not need to generate a process time difference.

Referring to fig. 1 and 2, the workstations A, B, C are disposed close to the first rail 21 and the workstations D, E, F are disposed close to the second rail 22 at intervals, wherein the workstation E is a pressing process requiring a long process time and is disposed at the space of the 7 th to 12 th tools of the second rail 22.

Referring to fig. 11, the tool 50 arranged on the first track 21 is moved to the station a, and the robot arm of the station a places the dispensed lower core 91 in the cavity 53 of the tool 50; referring to fig. 2 and 12, the tool 50 with the lower iron core 91 is continuously pushed forward by the second pushing unit 32 to the station B, and the mechanical arm of the station B stacks the coil member 92 on the lower iron core 91; referring to fig. 2 and 13, the tool 50 stacked with the coil 92 is continuously pushed forward to the workstation C by the second pushing unit 32, and the workstation C performs dispensing operation on the coil 92; referring to fig. 6 and 14, the tool 50 after completing the dispensing process is pushed by the third pushing unit 33 to move from the first rail 21 to the second rail 22, and then the robot arm of the workstation D stacks the upper iron core 93 above the coil 92;

the tools 50 stacked with the upper iron core 93 are continuously pushed forward by the pushing member 343 of the fourth pushing unit 34 which performs short displacement for one grid and arranged in sequence, when the spaces of the tools 13 th to 18 th of the second rail 22 are full of the tools 50 stacked with the upper iron core 93 as shown in fig. 9, the pushing member 343 of the fourth pushing unit 34 performs long displacement, and as shown in fig. 10, the tools 50 which are originally located in the spaces of the tools 13 th to 18 th of the second rail 22 are pushed to the spaces of the tools 7 th to 12 th of the second rail 22 and moved to the workstation E; referring to fig. 15 and 16, the station E is operated to perform a pressing process on the parts on the tool 50 located in the 7 th-12 th tool space of the second rail 22; when the tools 50 of the batch are pressed together, the other tools 50 are still pushed and moved to the respective work stations for processing, until the tools 50 of the second batch that have completed the process of the work station D are arranged in the tool spaces 13 th to 18 th on the second track 22, the work station E ends the process operation, and then the pushing member 343 of the fourth pushing unit 34 is moved for a long distance again, so that the tools 50 in the tool spaces 7 th to 12 th on the second track 22 of the work station E are pushed to the tool spaces 1 st to 6 th on the second track 22.

The pressing tool 80 of the workstation E includes a pressing unit 81 and two side pressing units 83, the two side pressing units 83 are respectively connected to two parallel moving rods 85, when the pressing tool 80 is driven to press, the two moving rods 85 will move in opposite directions, so that the two side pressing units 83 approach to the other side pressing unit 83, respectively, and the opposite sides of the part can be pressed tightly while pressing, thereby reducing the occurrence of dislocation during pressing.

Referring to fig. 16, when the tool 50 moves to the 1 st tool space of the second rail 22, the finished transformer 90 is taken out by the workstation F, the first pushing unit 31 then pushes the tool 50 to the first rail 21 for the next process cycle, and the tools 50 located in the 2 nd to 6 th tool spaces of the second rail 22 are sequentially pushed to the 1 st tool space by the fifth pushing unit 35, so that the workstation F takes out the finished product.

The invention can achieve the following effect gains:

1. because the tool 50 is displaced in a rectangular cycle along the tool loop 20 and the workstations A, B, C, D, E, F are spaced along the tool loop 20, the tool 50 can complete one production operation and then perform the next production operation cycle directly, and the length of the product processing machine can be shortened.

2. By means of the difference between the tools 50 arranged on the two

rails

21, 22 of the tool loop 20, and the pushing

units

31, 32, 33, 34, 35 drive the tools 50 to perform rectangular cyclic displacement on the tool loop 20, and the pushing element 343 of the fourth pushing unit 34 can perform short-range displacement and long-range displacement at intervals, so that when a plurality of tools 50 are displaced to the middle section of the second rail 22, the batches stay for a longer time and are driven to displace by the batches, and the stay time of the tools 50 at each workstation A, B, C, D, E, F can be configured according to the process time difference of different processing stations A, B, C, D, E, F.

3. The workstation E with long processing time can perform processing operation on a plurality of tools 50 at one time while the workstation A, B, C, D, F with short processing time performs a plurality of operations by the time difference that the tools 50 stay at the processing station A, B, C, D, E, F; compared with the existing product processing machine, the machine table of each work station does not need to move along the two

rails

21 and 22, so that the machine table of the processing station can move more simply.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A product processing machine comprising a tool-moving device and a plurality of workstations, characterized in that:

the tool loop is arranged on the top surface of the base, is rectangular and comprises:

the five pushing units are all arranged on the base and drive the tools to perform rectangular cyclic displacement along the tool loop, and the five pushing units are respectively defined as:

a third pushing unit located at the third side of the tool loop near the second side and including a pushing element capable of moving from the third side of the tool loop to the fourth side;

the fourth pushing unit is positioned at the second side of the tool loop close to the fourth side and comprises a pushing piece capable of moving from the second side of the tool loop to the first side in a reciprocating manner, the pushing piece of the fourth pushing unit can perform short-range displacement and long-range displacement at intervals, and the long-range displacement distance is a multiple of the short-range displacement distance; and

2. The product processor of claim 1 wherein the tool pusher assembly further comprises a plurality of sensing units, each sensing unit facing the first track and the second track, respectively.

3. The product processor of claim 1, wherein the base has an elongated slot extending along the second track corresponding to the second track, and the pusher member of the fourth pusher unit is disposed in the elongated slot.

4. A product processor as claimed in any one of claims 1 to 3 wherein the first and second sides of the tool loop are each provided with a stop.

5. The product processor of claim 4, wherein a plurality of the stations are spaced apart proximate the first track and a remaining plurality of the stations are spaced apart proximate the second track.

6. A tool pushing device of a product processing machine comprises a base, a tool loop, four pushing units and a plurality of tools, and is characterized in that:

the four pushing units are all arranged on the base and drive the tools to perform rectangular cyclic displacement along the tool loop, and the four pushing units are respectively defined as:

a third pushing unit located at the third side of the tool loop near the second side and including a pushing element capable of moving from the third side of the tool loop to the fourth side; and

the fourth pushing unit is positioned at the second side of the tool loop close to the fourth side and comprises a pushing piece capable of moving from the second side of the tool loop to the first side in a reciprocating manner, the pushing piece of the fourth pushing unit can perform short-range displacement and long-range displacement at intervals, and the long-range displacement distance is a multiple of the short-range displacement distance.

7. The tool moving device of claim 6, wherein the base has a slot extending along the second rail corresponding to the second rail, and the moving member of the fourth moving unit is disposed in the slot.

8. The tool pushing device of claim 6, further comprising a plurality of sensing units, each of the sensing units facing the first track and the second track.

9. The tool pushing device of the product processor of claim 6 wherein the first side and the second side of the tool loop are each provided with a stop.

10. The tool pushing device of the product processing machine as claimed in any one of claims 6 to 9, further comprising a fifth pushing unit disposed between the fourth pushing unit and the first pushing unit, the fifth pushing unit comprising a pushing member capable of reciprocating from the second side to the first side of the tool loop.