JPS6233682Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a shaft device that rotatably supports a roll film for packaging in a packaging machine and allows roll films of different widths to be easily exchanged.

(Conventional technology) In general, large companies use packaging machines exclusively for specific products, so they rarely change the film depending on the type, but small companies and individual stores often change the film depending on the type. In many places, several types of film are exchanged within an hour and many types of products are shipped in one day. For this reason, as shown in FIG. 4, a general packaging machine is equipped with a pair of pins H and i that support the roll film F shown in phantom lines, and when exchanging two types of films F and F1 as shown in the figure, A threaded rod j with left and right thread grooves formed thereon is rotated by a handle k, and both pins h and i are simultaneously displaced in relative directions by the action of the screw, and the interval between pins h and i is adjusted according to the width of the film. I am able to adjust it.

(Problem that the invention aims to solve) However, if there is a large difference in the width of the films to be replaced, the handle that adjusts the spacing between the rings must be rotated many times each time the film is replaced.
It had the drawback of poor efficiency.

In view of the above points, it is an object of the present invention to provide a film support device that allows films to be replaced easily and efficiently even if there is a large difference in the width of the film to be replaced.

(Means for solving the problem) In order to solve the above object, the present invention supports a cylindrical shaft rotatably around a core shaft whose one end is cantilevered on the machine base and installed in a horizontal state. At the same time, a groove is formed along the longitudinal direction on the outer peripheral surface of the cylindrical shaft, and an endless chain is rotatably supported via two foils so as to be hidden in the groove. A pair of film support rings each having a flange formed on the outside around the periphery of the support ring and whose opposing surfaces are tapered surfaces are slidably supported, and
Of these film support rings, the first one on the machine stand side
The inner surface of the film support ring and the chain are connected through a first pin, and another second pin is formed in the chain at a portion opposite to the first pin, while the second pin is provided on the open end side of the core shaft. A push pin that contacts the outside of the second pin protrudes from the inner surface of the second film support ring, and further, an element for fixing the second film support ring to the cylindrical shaft is provided on the collar of the second film support ring. It is composed of

(Function) The cylindrical shaft of the second film support ring having a flange on the outside can be freely removed. When the second film support ring is removed, the end of the cylindrical shaft is opened, so that the rolled film supported around the cylindrical shaft can also be freely pulled out. When the film is removed, there is no load on the first film support ring, so if you grasp the flange of the first film support ring with your hand and move it toward the machine, it will be connected to the first film support ring via the first pin. The chain rotates, and the second pin of its symmetrical part simultaneously moves in the relative direction. In short, the two pins are always displaced by the same amount in relative directions using the chain as a power transmission element. Therefore, while covering the open end of the cylindrical shaft with different types of films,
A second film support ring is attached to the open end of the cylindrical shaft,
When the second film support ring is pushed in, the push pin protruding from the inner surface of the second film support ring pushes the second pin of the chain, and the first film support ring on the opposite side supported through the chain is automatically moved. approach. The first film support ring can be fixed to the cylindrical shaft with the film sandwiched between the left and right flanges, and the film is supported by the cylindrical shaft via the pair of film support rings.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIG. 2, which illustrates FIG. 1 more clearly, reference numeral 2 denotes a core shaft whose one end is fixed in a cantilever manner to the machine stand 3 of the packaging machine and which is arranged horizontally. A slightly thin threaded rod portion 4 is connected to the open end of the core shaft, that is, the right end in the drawing, and a bag-shaped handle 5 is provided on the outside of the threaded rod portion. Further, a cylindrical shaft 6 that is slightly shorter than the core shaft and has a slightly larger diameter than the handle 5 is placed around the core shaft 2, and a socket 7 is fixed to the left end of the cylindrical shaft 6 with a set bolt 8, and the inner surface of the socket is is rotatably supported on the core shaft 2 via a ball bearing 9. In other words, the ball bearing 9
is fixed to the socket 7 by a snap spring 10, so that the contact surface 11 between the inner surface of the ball bearing and the core shaft is slidable in the width direction. On the other hand, the right end of the cylindrical shaft 6 overlaps around the small diameter portion 5a of the handle 5, and the cylindrical shaft 6 is supported by the small diameter portion via a ball bearing 12. The ball bearing 12 is fixed to the cylindrical shaft 6 and the handle 5 by snap springs 13 and 14, respectively, so that when the handle 5 is rotated, the internal thread of the handle and the male thread of the threaded rod part 4 are connected to each other. Due to the spiral action, the cylindrical shaft 6 is displaced in the axial direction outside the core shaft 2 while sliding the contact surface 11 on the inner surface of the left bearing.

As shown in FIG. 3, elongated grooves 15, 15 are formed along the longitudinal direction on the front and back surfaces of the cylindrical shaft 6, and two chain foils 16, 16 are installed inside each end of these grooves. In addition to being rotatably supported, an endless chain 17, 17 is stretched between the two chain foils in each groove, and a first pin 18 and a second pin 19 are respectively attached to the opposite parts of the chain 17. It is set up. The relative part of the chain described here refers to the chain foil 1.
The upper and lower portions of the chain 17 bordered by the axes 6 and 16, in particular, the first pin 18 on the left side is connected to the cylindrical shaft 6.
It is connected to the inner surface of the first ring a on the left side of the two film support rings provided on the outside of the ring. Also, the second film support ring b on the right side has a push pin 3 on its inner surface.
0 stands out. The outer peripheries of both film support rings a and b are tapered so that their opposing sides are tapered, and flanges 20 and 21 are fixed to the outside of each, and an eccentric flange is attached to the right flange 21. A set handle 24 equipped with a roll 23 is provided.

Then, with the film sandwiched between the left and right flanges 20 and 21, the set handle 24 is operated,
When the eccentric roll 23 is pressed against the circumferential surface of the cylindrical shaft 6,
The second film support ring b is fixed to the cylindrical shaft 6, and at the same time the push pin 30 contacts the second pin 19 and restricts the movement of the chain 17, so that the first film fixed to the chain 17 via the first pin 18 The support ring a is also fixed. Therefore, the rolled film F is supported by the cylindrical shaft 6 via the film support rings a and b, and when the end of the film F is pulled, the cylindrical shaft 6 is moved to the core shaft 2 via the ball bearings 9 and 12. It rotates around the , and the film is unraveled.

When changing the film, use the set handle 2.
At step 4, the pressure between the eccentric roll 23 and the cylindrical shaft 6 is loosened, and the second film support ring b is removed from the cylindrical shaft 6, and the film F is also removed. The load on the first film support ring a is eliminated, and the first film support ring a
move freely. A new film is fitted around the cylindrical shaft 6, and the second film support ring b
When you push in, the push pin 30 connects to the second pin 19.
Since the first film support ring a is moved by pressing the film support ring a, the film is finally supported under pressure between the two film support rings a and b.

When the handle 5 is rotated, the film is displaced in the axial direction together with the cylindrical shaft 6, and fine adjustments can be made so that the center of the packaging machine and the center of the film can be aligned.

Note that a set bolt may be used instead of the eccentric roll 23 that fixes the collar 21.

(Effects) The present invention makes it possible to attach and detach the second film support ring b with a brim on the open end side of the core shaft to the cylindrical shaft 6, and at the same time, the endless chain in the groove 15 formed in the cylindrical shaft 17 is supported via two foils 16, 16, and the opposite part of the corresponding chain is connected to two film support rings a, b which are slidably fitted to the cylindrical shaft, and the film on one side is The interlocking movement of the support ring is transmitted linearly to the film support ring on the other side through the chain, making it possible to simultaneously displace the two rings with a large amount of momentum. Compared to the one that displaces the rings,
This has the effect of allowing the film to be replaced quickly and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the previous figure, FIG. 3 is a view taken along the - line of the previous figure, and FIG. 4 is an explanatory diagram of a conventional example. 2...Core shaft, 3...Machine base, 4...Threaded rod, 5...
...Handle, 6...Cylindrical shaft, 15...Groove, 16...
... Chain foil, 17 ... Chain, 20 ... Flange, 21 ... Tsuba, 22 ... Film support part, 3
0... Push pin, a, b... Film support ring.

Claims (1)

[Scope of utility model registration request] A cylindrical shaft 6 is rotatably supported around a core shaft 2 whose one end is cantilevered and horizontally installed on the machine stand 3 of a packaging machine, and is supported along the outer peripheral surface of the cylindrical shaft 6 in the longitudinal direction. A groove 15 is formed, and an endless chain 17 is inserted between two foils 16 and
16, while flanges 20, 21 are provided on the outside around the cylindrical shaft 6, respectively.
and slidably support a pair of film support rings a and b whose opposing surfaces have a tapered shape, and among these film support rings,
The inner surface of the first film support ring a on the machine stand side and the chain 17 are connected via a first pin 18, and another second pin 19 is connected to the chain 17 at a portion opposite to the first pin 18. On the other hand, a second film support ring b provided on the open end side of the core shaft 2
A push pin 30 that contacts the outside of the second pin protrudes from the inner surface, and an element 23 for fixing the second film support ring b to the cylindrical shaft 6 is provided on the collar 21 of the second film support ring b. A packaging roll film support device.