TW201718351A - Shrink wrap machine - Google Patents

Abstract

This invention relates to a shrink wrap machine, which includes a central column and a shrink film synchronous transmission equipment. Said central column is provided with a first column and a second column which are configured to mutual suspension separation for removing the connection between the first column and the second column to make the shrink wrap machine be expand to fit onto the desired diameter range of bottles or cans and increase the range of applications. The delivery wheel of said shrink film synchronous transmission equipment will continue to transfer the shrink film downward and wrap the shrink film on the second column of the central column gradually when the first column of central column is opened the shrink film, and the drawing wheel will individually draw the shrink film downward to wrap the shrink film on the surface of the bottles or cans after the shrink film is cut by the cutter equipment. Then the conveying equipment will convey the bottles or cans forward to the next equipment and making the shrink film and the bottles or cans be shrunk packaging completely to accomplish the action of bottles or cans wrapped by the shrink film.

Description

Sleeve labeling machine (1)

The invention relates to a sleeve labeling machine, in particular to a cutter device arranged between a feeding wheel and a drawing wheel of a synchronous film transmission device of a shrink film, and the shrink film is continuously guided downward by a feeding wheel, and is cut. After the knife device cuts the shrink film, the individual shrink film is continuously pulled by the pull label to be sleeved on the outer surface of the bottle or the can, so as to prevent the individual shrink film that is cut from being cut to prevent the wrinkles from guiding the conveyance, thereby ensuring The sleeve labeling machine can accurately set the shrink film on the labeling action of the bottle or the can, and the first column and the second column of the center column are designed to be separated from each other by suspension, and the first column is removed. The connection between the body and the second cylinder allows the diameter of the bottle or can to be packaged by the sleeve labeling machine to be expanded to a minimum diameter, thereby increasing the application range of the labeling machine.

According to the current market-oriented sleeve labeling machine, such as the new bulletin No. 379728 "Heat Shrink Film Mechanized Guide Equipment", it is mainly provided with a set of feed wheels on the center guide post, the middle and lower periphery of the rack. In the group, a guide wheel is arranged on the center guide column corresponding to the feeding wheel set, and a cutter device is arranged near the lower end of the center guide column, and a lowering wheel is arranged at the lower end of the central guiding column, and the base of the feeding wheel set is provided. One side is provided with an adjusting wheel, two guiding rods are arranged between the bases, and a shaft rod is arranged between the two guiding rods, the two ends of the shaft rod are oppositely oppositely threaded, and each of the opposite threads is oppositely screwed. The guide block has a wheel base fixed under each of the guide blocks, the wheel seat is provided with a feeding wheel, and the pulley wheel and the connecting rod are arranged at the rear end of the feeding wheel, and the pulleys of each feeding wheel are respectively driven by the belt sleeve, which can be driven by the motor. The organization operates. That is, the foregoing prior art mainly uses three sets of feed wheel sets disposed above, in the middle, and below the center pillar to guide the shrink film of the center pillar to move downward, and the purpose is only to set three groups. The feeding wheel of the feeding wheel set adjusts the setting position according to the diameter of the center guiding column, and allows the overall mechanism to match the shape of the bottle or the can to set different angles. The central guide post is a connected cylinder. The joint has a certain volume, which limits the range that the cutter can cut.

Another example is the new M424307 "label cutting machine cutting and cutting device", mainly, when the sleeve label with the separation line is pulled into the center column of the sleeve labeling machine, the active conveying wheel set through the feeding mechanism The driven conveyor wheel set rotates synchronously and continuously. Under the pressure matching of the corresponding Palin group installed in the center column, the label tape set on the circumferential surface of the center column will perform continuous downward conveying action. And being fed one by one to the position of the marking mechanism; at the same time, when the marking mechanism detects that the being covered in the conveying has not been detected, the rotation speed of the marking wheel set is set to be active and driven with the feeding mechanism. When the wheel set is synchronized, the label tape fed by the feeding mechanism into the marking mechanism will be smoothly conveyed downward; then, when the wrapped object is conveyed to the set position detected and detected under the center column, In this case, the speed of the labeling belt is constant, and the speed of the marking wheel set is instantaneously accelerated. Naturally, the marking wheel is automatically rotated. Group and corresponding Palin group touched The label belt will instantly produce an unbalanced acceleration pulling force, causing the separation line adjacent to the chopping line to break, and thus smoothly forming the expected single label to be quickly ejected by the marking wheel set to perform the set quilt action. That is to say, the above-mentioned prior art is mainly a structural feature that the label is torn off instantaneously because a separate line is processed on the label and the speed of the label belt is different by the labeling wheel set and the feeding mechanism. It is necessary to pre-process a separate line for the label to increase the unit cost of the label, which is completely different from the feature of the present invention for cutting the shrink label by the cutter.

The conventional sleeve labeling machine, as shown in Figures 1 and 2, has a central column A provided with a first cylinder A0 and a second cylinder A1, but as described above, the active conveying wheel set A2 and the driven conveying wheel set A3 are The first column body is disposed above the first column body, and the active conveying wheel set A2 and the driven conveying wheel set A3 are pushed downward for the shrink film, and are disposed on the first column A0 and the second column A1. A cutter groove A4 is disposed therebetween, and the cutter groove A4 surrounds the periphery of the center rod B, and the first column and the second column system are coupled by the center rod B. Furthermore, the above-mentioned cutter C is composed of a plurality of sets of cutters, such as four sets of cutters C0, C1, C2, and C3, so that each cutter C0, C1, C2, and C3 can be used for the shrink film D. The range of cuts D0, D1, D2, and D3 is extremely limited. Therefore, each of the cutters C0, C1, C2, and C3 cannot reach the center point of the shrink film.

For this reason, the present inventors have invented the present invention by studying the design and manufacturing experience of related equipment for many years, and specifically studying the structural problems of the aforementioned prior art.

The object of the present invention is to provide a transfer and cutting of a shrink film which can be applied to various diameters, to overcome the currently designed central column design of the sleeve labeling machine, and to reduce the diameter of the shrinkable film available, and to remove the conventional The limitation is to innovate by relaxing and narrowing the diameter of the bottle or can that can be swept by the shrink film and accurately splicing the bottle or can.

In order to achieve the above object, the sleeve labeling machine of the present invention is provided with a first column body and a second column body respectively in the center column, wherein the first column body and the second column body are designed to be suspended and separated from each other. The purpose is to remove the conventional center rod connected between the first cylinder and the second cylinder, so that the diameter of the bottle or can can be expanded to the minimum diameter of the sleeve labeling machine, and the sleeve labeling machine can be increased. The scope of the application.

The sleeve labeling machine of the invention is that after the first cylinder of the center column spreads the shrink film, the shrink film can be pushed down by the feeding wheel of the shrinking film synchronous transmission device located above the cutter device, and gradually Insert the second column of the center column, and then continue to pull down the shrink film by the feeding wheel of the shrink film synchronous transmission device located under the cutter device, and then cut through the cutter device to accurately lie on the Bottle or canister outside the table.

The sleeve labeling machine of the invention is centered on the center column, and the feeding wheel of the shrink film synchronous transmission device is arranged above the cutter device, and the pull label wheel of the shrink film synchronous transmission device is arranged under the cutter device , the aforementioned feeding wheel and the pulling wheel are synchronized to the shrink film, and even the thin film is not easy to produce the pressing problem, and is divided into the first column and the second column, respectively. No connection, allowing the cutter gap to be minimized, can be used for small diameter bottles or cans, and the individual shrink film is accurately placed on the outside of the bottle or can.

The sleeve labeling machine of the invention, wherein the cutter device is composed of a plurality of sets of cutters, and allows each cutter to be cut to the center point of the shrink film, thereby increasing the range in which the cutter can be cut, and strictly cutting the shrink film and lifting the shrinkage. The practicality of packaging.

The sleeve labeling machine of the invention, wherein the cutter device is composed of one or more sets of cutters, and the first cylinder and the second cylinder are separated and suspended, so that the cutter can be directly cut into the shrink film to enhance the shrinkage. The practicality of packaging.

In this way, in order for the examiner to fully understand the sleeve labeling machine of the present invention, the following is explained as follows:

3 and 4, the sleeve labeling machine of the present invention comprises at least a central column 1 and a first column body 1a and a second column body 1b separated from each other in a suspended shape, mainly by such separation and suspension. The first cylinder 1a and the second cylinder 1b are structurally characterized to remove the need for a center rod to be coupled between the first cylinder and the second cylinder to allow the shrinkage membrane to be used at a minimum diameter. The limitation is that the sleeve labeling machine of the invention can be applied to the shrink film with the smallest diameter, and the applicable range of the shrink film can be relaxed, so as to match the bottle or can of various diameter specifications, the shrink film can be used as the labeling and packaging theme. The lifting effect is improved, and the cutting groove 1c is disposed between the first cylinder 1a and the second cylinder 1b, and the first cylinder 1a and the second cylinder 1b are separated from each other by freely adjusting. The distance between the cutter grooves is d, and the gap between the cutting blades can be reduced, and the distance between the ends of each cutter can be adjusted and reduced to zero, so that each cutter can be cut to the center point of the shrink film, and the shrink film is cut perfectly. Broken, so that the small diameter bottle or can can use the sleeve labeling machine. Moreover, since the first cylinder and the second cylinder of the present invention are in a state of separation and suspension, the cutter groove 1c is a through-hole groove, and the range of the cutting and shrinking film of the cutter is maximized.

3 to 5, a shrink film unwinding sheet 10 is disposed above the first cylinder 1a, so that the flat shrink film 4 (see FIG. 7) is stretched through the shrink film unwinding sheet 10; A plurality of first guide wheels 11 are disposed on the side of the first cylinder 1a. The first guide wheels 11 have no power and only have a balance center column 1 to cooperate with the shrink film synchronous transmission device 2 to maintain the positioning function of the center column. The plurality of first guide wheels 11 are respectively disposed on the front side and the rear side of the center pillar 1 and are distributed in the left, right, up, and down directions, and are preferably formed in a corresponding straight line state with each of the second guide wheels 12. Located inside the first cylinder 1a, corresponding to the plurality of first guide wheels 11 and respectively provided with a plurality of first balance bearings 11a for respectively contacting the aforementioned first guide wheels 11 to generate for the first cylinder 1a Balance the role of positioning.

As shown in FIG. 3 to FIG. 5, a plurality of second guide wheels 12 are disposed on the end side of the center column 1 near the end of the second column 1b, and are distributed in the left and right directions, and are driven to rotate by the power element 120 to obtain a single sheet. The shrink film is brushed under the cover to the bottle or can. Corresponding positions of the plurality of second guide wheels 12 are disposed inside the second cylinder 1b with a second balance bearing 12a for presenting left, right, down, and upper distributions, and two second balance bearings located above the same side. 12a is operated with the second guide 12 located on the same side, and the outer diameter of the second guide wheel 12 on the contract side is set by the distance d1 between the upper side and the lower second balance bearing 12, and the second second is accommodated. The partial area of the guide wheel 12, and by the contact between the second balance bearing 12a and the second guide wheel 12, the shrinking film synchronous transmission device 2 cooperates to produce a balance effect on the second cylinder 1b to maintain the The positioning position of the two cylinders 1b is suspended. When the pulling wheel 21 feeds the single shrink film 4 down to the second guide wheel 12, the shrink film is brushed by the second guide wheel 12 to be shot in the bottle or On the tank, complete the sleeve labeling effect.

3 to 5, a middle portion of the center column 1 is provided with a shrink film synchronous transmission device 2, and is disposed between the first guide wheel 11 and the second guide wheel 12, and the shrink film synchronous transmission device 2 is provided with plural numbers. The indicator wheel 20 and the plurality of pull indicator wheels 21 are provided. The delivery wheel 20 is disposed on the side of the first cylinder 1a of the center pillar 1 and is preferably disposed perpendicularly to the first guide wheel 11 and the second guide wheel 12. The delivery wheel 20 is located at the cutting edge. Above the knife device 3. The aforementioned marking wheel 20 drives the mandrel with the power device 22 (generally, no further details are described), and then the transmission belt is wound around the corresponding axle (as shown in FIGS. 4 and 5, the transmission belt winding method belongs to the prior art, Therefore, the effect of the synchronous transmission target wheel 20 and the pull indicator wheel 21 is generated, so that the aforementioned delivery wheel 20 and the pull indicator wheel 21 can be rotated synchronously, so that the shrink film fed downward from the delivery wheel 20 can be The pull labeling wheel 21 smoothly engages and pulls, so that the sleeve labeling machine of the invention can be smoothly guided and transported for the shrink film of various thicknesses.

3 to 5, a plurality of first support bearings 20a are provided with respect to the corresponding positions of the feed wheel 20, and the first support bearing 20a is disposed inside the first cylinder 1a and presents left and right. And the upper and lower settings are arranged, and the first support bearings 20a located on the same side and the lower side are formed to form an appropriate spacing d2, and the wheel diameters of the delivery wheels 20 corresponding to the same side are matched to accommodate the delivery wheel 20 ( 6 and 7), by the first support bearing 20a and the delivery wheel 20, a certain supporting suspension effect is generated for the first cylinder 1a of the center pillar 1, and the first support bearing 20a and the aforementioned bidding are performed by the first support bearing 20a. The two points of the wheel 20 are in contact to form a triangular bidding space, so that the shrink film can be smoothly pushed by the index wheel 20 and the first support bearing 20a and guided downward by the center column 1 as an axial direction.

3 to 5, the plurality of puller wheels 21 are disposed on the side of the second cylinder 1b and are located below the cutter device 3. If the feeding wheel 20 and the pulling wheel 21 are driven by the power device 22 to generate a mandrel, the effect of the synchronous operation is obtained, and the shrink film 4 fed downwardly from the feeding wheel 20 can be smoothly connected to the drawing wheel 21. Therefore, the invention can smoothly guide and transport the shrink film of various thicknesses. The second column body 1b is located inside the second column body 1b, and is provided with a plurality of second support bearings 21a disposed at the left, right, upper, and lower sides of the side of the second column body 1b. And forming a suitable spacing d3 on the same side of the upper two sets of second supporting bearings 21a, matching the wheel diameter corresponding to the sliding wheel 21 on the same side, to accommodate the pulling wheel 21, by the second supporting bearing 21a and the pulling standard The wheel 21 has the effect of supporting and suspending the second cylinder, and then the second support bearing 21a and the pull indicator wheel 21 are in contact with each other to form a triangular pull label space, so that the shrink film 4 can be pulled by the pull wheel 21 and The second support bearing 21a is smoothly pulled and guided to the outside of the bottle or can with the center column 1 as an axial lower guide. In this way, the shrink film can be conveyed downward by the above-mentioned feeding wheel 20, and the single shrink film which is conveyed from the marking wheel 20 by the pulling wheel 21 and cut by the cutter device is sufficient to prevent The shrink film produces an extrusion wrinkle, so that the shrink film of various thicknesses is smoothly conveyed down to the lowest end of the center column 1, and the shrink film is brushed by the second guide wheel 12 and the second balance bearing 12a. On a bottle or can.

6 and 7, the first guide wheel 11, the second guide wheel 12, the transfer wheel 20 of the shrink film synchronous transmission device 2, the pull indicator wheel 21 and the shrink film 4 are in a cross-axial surface contact. When the shrink film 4 is smoothly guided to the lowest end of the second cylinder 1b of the center pillar 1, the shrink film is sprayed on the bottle by the second guide wheel 12 and the second balance bearing 12a. On the can.

As shown in FIGS. 3-7, the first cylinder 1a and the second cylinder 1b of the center pillar 1 are separated and suspended, thereby reducing the distance d between the first cylinder 1a and the second cylinder 1b. The end spacing of each cutter of the cutter device is reduced to zero, which allows the sleeve labeling machine to cooperate with the shrink film of various diameters for sleeve labeling operation.

6 to 9, a cutter device 3 is provided on the side of the cutter groove 1c of the center column 1, and the cutter device 3 pushes the shrink film from the feed wheel 20 and the first support bearing 20a to the shrink film. The drawing wheel 21 and the second supporting bearing 21a are successively pulled. After reaching the positioning, the cutting device is perfectly cut by the cutter device, and then a single shrink film is formed on the second cylinder 1b of the center column 1 to make various thicknesses. The shrink film is smoothly conveyed downward, and the shrink film is brushed by the second guide wheel 12 and the second balance bearing 12a to be jacketed on the outer surface of the bottle or the can.

8 and 9, the cutter device 3 is composed of a plurality of sets of cutters, such as three sets of cutters 30, 31, 32, and the ends of each cutter 30, 31, 32 are cut to reach a contraction. The center point of the film 4 is separated from the second column by the first column and the second column of the present invention, and the cutter groove 1c is a through-hole groove, so that each of the cutters 30, 31, 32 cuts the shrink film. The range is maximized to ensure that the best cutting effect is achieved each time the shrink film is cut, and the cut of the cut shrink film is cut off, which enhances the practical value of the shrink wrap. Of course, the cutter device 3 can also be composed of a set of cutters. By separating the first cylinder and the second cylinder, the single cutter can directly cut the shrink film, and the utility of the sleeve label can be improved again. value.

In summary, the sleeve labeling machine of the present invention is provided with a delivery wheel 20 on the first column 1a of the center column, and a pull indicator wheel 21 on the second column 1b of the center column 1, and then sent in the foregoing A cutter device is disposed between the indicator wheel 20 and the pull indicator wheel 21 to perform a single sheet cutting operation on the shrink film, and then the single shrink film is continuously pulled down by the pull label wheel, thereby allowing the present invention to cooperate with various types. The thickness of the shrink film operates to prevent the individual shrink film from being cut to produce wrinkles that hinder the conveyance, ensuring that the sleeve labeling machine can accurately squash the shrink film on the bottle or can, and then the first column 1a of the center column 1 The second cylinder 1b is designed to be separated from each other in a suspended shape, and is not required to be connected by a center rod between the first cylinder and the second cylinder, and is located in the first cylinder 1a and the second cylinder 1b. The cutter groove 1c is provided with a freely adjustable cutting distance d, and the invention can be applied to various diameters of the shrinking die by allowing the end of each cutter to reach a zero distance, in particular, the diameter of the shrink film can be Shrink to the extreme to match the various small diameter bottles or cans, the shrink film can be smoothly shot to shrink The bottle or can of packaging makes the use of the sleeve labeling machine of the invention wider, and is a novel and progressive component of the present invention.

1‧‧‧ center column
1a‧‧‧first cylinder
1b‧‧‧Second cylinder
1c‧‧‧cutting slot
D‧‧‧ spacing
10‧‧‧Shrink film unrolling film
11‧‧‧First guide wheel
11a‧‧‧First Balance Bearing
12‧‧‧Second guide wheel
12a‧‧‧Second balance bearing
120‧‧‧Power components
D1‧‧‧ spacing
D2‧‧‧ spacing
D3‧‧‧ spacing
2‧‧‧Shrink film synchronous transmission equipment
20‧‧‧Send the wheel
20a‧‧‧First support bearing
21‧‧‧ Pulling wheel
21a‧‧‧Second support bearing
22‧‧‧Power equipment
3‧‧‧Cutter equipment
4‧‧‧Shrink film

1 is a view and a partially enlarged view of a conventional center post. Figure 2 is a view of a conventional cutter apparatus for cutting a shrink film. Figure 3 is a partial left side view of the sleeve labeling machine of the present invention. Figure 4 is a partial rear elevational view of the sleeve labeling machine of the present invention. Figure 5 is a partial right side view of the sleeve labeling machine of the present invention. Figure 6 is a partial operational view of the sleeve labeling machine of the present invention. Fig. 7 is a diagram showing the operation of the sleeve labeling machine of the present invention. Figure 8 is a view of the cutter apparatus of the present invention cutting a shrink film. Figure 9 is a partial enlarged view of the cutting and shrinking film of the cutter device of the present invention

1‧‧‧ center column

1a‧‧‧first cylinder

1b‧‧‧Second cylinder

1c‧‧‧cutting slot

D‧‧‧ spacing

10‧‧‧Shrink film unrolling film

11‧‧‧First guide wheel

12‧‧‧Second guide wheel

120‧‧‧Power components

2‧‧‧Shrink film synchronous transmission equipment

20‧‧‧Send the wheel

21‧‧‧ Pulling wheel

3‧‧‧Cutter equipment

Claims (7)

A sleeve labeling machine comprises at least: a central column, a first column body and a second column body, wherein the first column body is provided with a first guide wheel to generate an equilibrium positioning function for the first column body; and the second column body is located at the second column body And a second guide wheel is provided to balance the positioning of the second cylinder, and the shrink film can be brushed from the second cylinder to the bottle or the can; the shrink film synchronous transmission device is provided with the conveying wheel and the pulling The marking wheel can be synchronously guided and conveyed by the feeding wheel and the pulling wheel for the shrink film on the center column, and the feeding wheel is disposed on the side of the first column on the center column, and Located above the cutter device to transport the shrink film of the first cylinder downward by the aforementioned marking wheel; the pull wheel is disposed on the side of the second cylinder of the center column, and is located at the cutter device In the lower part, the shrinking film reaching the second cylinder is synchronously drawn to reach the fixed point by using the aforementioned pulling wheel, so that the cutting device is cut off; thus, the first cylinder is caused to support the floating by the aforementioned feeding wheel. And the first guide wheel cooperates with the delivery wheel to make the first cylinder Balance the positioning effect; and by using the aforementioned pulling wheel to generate a supporting suspension effect for the second cylinder, and then the second guiding wheel cooperates with the feeding wheel to balance the positioning of the second cylinder, the first column can be made The body and the second cylinder are separated from each other and suspended, so that the ends of the cutters of the cutter device are cut to reach the center point of the shrink film, so that the sleeve labeling machine can cooperate with the shrink film of various diameters, and cooperate with various types. Packaging of the diameter of the bottle or can. A sleeve labeling machine comprises at least: a central column, a first column body and a second column body, wherein the first column body is provided with a first guide wheel to generate an equilibrium positioning function for the first column body; and the second column body is located at the second column body And a second guide wheel is provided to balance the positioning of the second cylinder, and the shrink film can be brushed from the second cylinder to the bottle or the can; the shrink film synchronous transmission device is provided with the conveying wheel and the pulling The marking wheel can be synchronously guided and conveyed by the feeding wheel and the pulling wheel for the shrink film on the center column, and the feeding wheel is disposed on the side of the first column on the center column, and Located above the cutter device to transport the shrink film of the first cylinder downward by the aforementioned marking wheel; the pull wheel is disposed on the side of the second cylinder of the center column, and is located at the cutter device In the lower part, the shrinking film reaching the second cylinder is synchronously drawn to reach the fixed point by using the aforementioned pulling wheel, so that the cutting device is cut off; thus, the first cylinder is caused to support the floating by the aforementioned feeding wheel. And the first guide wheel cooperates with the delivery wheel to make the first cylinder Balance the positioning effect; and by using the aforementioned pulling wheel to generate a supporting suspension effect for the second cylinder, and then the second guiding wheel cooperates with the feeding wheel to balance the positioning of the second cylinder, the first column can be made The body and the second cylinder are separated from each other and are suspended; the cutter device is provided with a plurality of sets of cutters, and the ends of the cutters are located in the cutter groove to be close to zero distance, so that each cutter can be cut to reach the shrink film At the center point, the sleeve labeling machine can be used with shrinking films of various diameters, and can be packaged with various diameter bottles or cans. The sleeve labeling machine according to claim 2, wherein the cutter device is composed of a set of cutters, and the first cylinder and the second cylinder are separated from each other to allow the single cutter to directly cut the shrink film. . The sleeve labeling machine according to claim 1 or 2, wherein the first guide wheel and the second guide wheel are plural, the purpose is to balance the positioning function of the center column, and is provided with respect to the corresponding position of the first guide wheel. a first balance bearing; the second guide wheel is provided with a power shaft driven by the power component, and is provided with a second balance bearing relative to the corresponding position of the second guide wheel to form a force of the under-shrink film to cover the bottle or The role of the can. The sleeve labeling machine according to claim 4, wherein the second balance bearing corresponding to the second guide wheel is formed to fit the distance d1 between the outer diameters of the second guide wheels to accommodate a part of the area of the second guide wheel, and The second balance bearing is in contact with the second guide wheel to suspend the second cylinder, and then form a separate floating shape with the first cylinder to increase the range of cutting of each cutter of the cutter device, so as to shrink The diameter of the membrane can be minimized to match the sleeves of bottles or cans of various diameters. Upon request entry of the sets of standard machine or 12, wherein a position corresponding to the standard feed of the wheels, provided with a first bearing support, the first support bearing system is disposed inside the first cylinder, the first support by The bearing and the delivery wheel are in contact with each other to form a triangular bidding space, so that the shrink film can be guided by the delivery wheel and the passive feeding, smoothly pulled and guided downward by the central column. The sleeve labeling machine according to claim 1 or 2, wherein the corresponding position of the pull indicator wheel is provided with a second support bearing, and the second support bearing is disposed inside the second cylinder of the center column, the second Supporting the bearing and forming the wheel diameter of the matching pull wheel to form an appropriate spacing d3 to accommodate the pull wheel, which has a certain supporting effect on the pull wheel, so that the second cylinder produces a dangling effect.