JPS6025367Y2 - Cutting device in packaging equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for cutting continuous bag bands and other packaging material bands used in packaging devices into required dimensions.

Conventional devices use a cam, an eccentric, a crank, etc. to reciprocate the cutting member from a continuous rotating shaft that rotates once per cycle.

However, there are cutting devices in which the cutting member uses a serrated cutting blade to pierce the material, or in which discontinuous cuts are made in advance in the packaging material strip and the cutting member is struck impactfully into the cuts to cut the material. In, when the speed of the cutting member is low,
The wrapping material strip slips out of the clamping portion or is stretched, resulting in a sharpness of sharpness, and this tendency is particularly noticeable when the length of one revolution per cycle is longer.

Therefore, in this invention, the moving speed of the cutting member during cutting is always kept at a predetermined speed, regardless of the time required for one cycle or the operating speed.

In this invention, when a pair of hemorrhoid jaws are in pressure contact with each other and clamping a continuous bag, the hemorrhoid can be placed near the weld.

A rod serving as a discontinuous cut cutting member that protrudes into the transfer path of the continuous bag strip connected with discontinuous cuts and retreats is slidably equipped with respect to the machine frame.1. The tip of the cutting member is urged by a spring to a position protruding into the transfer path,
A hooking pawl for holding the rod in the retracted position is provided on the machine frame.The machine frame has a cam for retracting the rod from the protruding position to a position where it engages with the hooking pawl, and a cam for removing the hooking pawl. This is a cutting device for use in packaging equipment, characterized in that the welding material is fixed to a sequence operating shaft having a cam that reciprocates the welded material.

This invention will be explained based on the illustrated representative embodiment.

F is a continuous bag band connected by discontinuous cuts 1 shown in FIG.

Loading the continuous bag belt F into the packaging device 10,
Regarding an example in which the leading edge bag part B is held between the transfer rollers 11 and hangs between a pair of welds 12 of the sandwiching type, and the front continuous cut 1 is positioned just above the upper surface of the welds 12. This will be explained (see Figure 1).

Reference numeral 13 denotes a transfer path for the continuous bag strip F, and indicates the position of the packaging material strip F from the transfer roller 11 to the welds 12.

Reference numeral 14 denotes a cutting member which protrudes from outside the transfer path of the continuous bag band F into the transfer path 13 over the entire width of the continuous bag band F, and a rod 1-5 integrated with this is connected to the machine frame. 16, and is biased by a spring 17 so that the cutting member 14 protrudes into the transfer path 13.

A part of the rod 15 or a member integral therewith is provided with a cam receiving portion 18 and a hooking portion 19 for holding the rod 15 in the retracted position.

Reference numeral 20 denotes an engaging pawl that engages with a spring 24 when the engaging portion 19 is retracted, and is pivotally supported on the machine frame 16.

Reference numeral 21 denotes a horizontal sequence operating shaft orthogonal to the rod 15, which includes a cam 22 that abuts the cam receiving portion 18 and retracts the rod 15 to a position where it engages with the engaging pawl 20, and a cam that removes the engaging pawl 20. 23 is fixed.

Although not shown, a cam for reciprocating the welds 12 and operating other members is further fixed to the sequence operating shaft 21.

The above-mentioned sequence operating shaft 21 may be continuously rotated by the motor 25, or may be a shaft that is rotated once when necessary and then stopped until the next cycle.

In this invention constructed as described above, when the continuous bag band F is clamped by the pair of welds 12, the engaging pawl 20 is removed by the cam 23, and the sequence operating shaft 21 is rotated.

Now, the cutting member 14 has already been inserted into the conveying path 13 of the continuous bag band F.
When the sequence operating shaft 21 is rotated in the clockwise direction, the cam 22 first presses the cam receiving portion 18 that is integrated with the rod 15 (see FIG. 3), and When the cutting material member 14 is moved backward against the spring 17, the engaging portion 19 of the cam receiving portion 18 engages with the engaging claw 20 when the cutting member 14 has retreated to the outside of the transfer path 13.
, the rod 15 and the cutting member 14 are maintained in the retracted state.

In this state, for example, the sequence operating shaft 21 is temporarily stopped, and during this time the continuous bag band F is transferred to a predetermined position by the transfer roller 11, suspended in the transfer path 13, and the bag portion B is blown by the air blower 26. The object to be packaged is inserted into this bag portion B.

In response to this insertion completion signal, the sequence operating shaft 21 is rotated again, and the opening of the bag B is first clamped by the welding member 12, and then the engaging claw 20 is removed by the cam 23 (
(see FIG. 5), the rod 15 and the cutting member 14 are connected to the spring 17.
Due to the restoring force, the state shown in FIG. 5 changes to the state shown in FIG. 3, and the discontinuous cut 1 portion of the continuous bag band F is violently struck with the tip of the cutting member 14 to separate this portion.

Thus, by rotating the sequence operating shaft 21, the welds 1
2 separates, the sealed bag falls downward, and the cutting member 14 and rod 15 are retracted by the cam 22,
The engaging claw 20 engages with the engaging portion 19, and the cycle completes one round.

In this device, which has the structure and functions as described above, the transfer roller 11 controls the length of time for one cycle of the sequencer, the operating speed, and more specifically, the rotational speed of the sequence operating shaft 21 and the cutting speed. The actuation speed at which the member 14 projects into the transport path is completely independent.

Therefore, the optimum speed for cutting can always be obtained without being affected by the operating speed or the length of the operation cycle.

In the other illustrated embodiments, the support portion 27 supporting one end of the spring 17 for moving the cutting member 14 in the operating direction is provided by a nut 28 screwed onto the rod 15.
Since the repulsive force of the spring 17 can be adjusted by moving its position in the axial direction, the discontinuous cut 1 can be easily separated, and the packaging material band F can be easily separated.
If the supporting member 2 is weak like cellophane, the repulsive force is weakened, and if the film is strong and the discontinuous cuts 1 are formed well, the repulsive force is strengthened.
7 can be adjusted by screwing a nut 28.

In the device of this invention, for example, the motor 25 is a reversible rotary motor, and the intermediate shaft 29 is rotated forward and backward by the motor.
are provided with two one-way flanges with different connection rotation directions, and the operating time of the transfer roller is adjusted so that the driven part of one rotates the transfer roller 11 and the driven part of the other flange drives the sequence operating shaft 21. Even when used in combination with one in which the operating time of the sequence operating axis can be freely selected, the best cutting speed can always be obtained with this invention.

[Brief explanation of drawings]

The drawings relate to this invention, and FIG. 1 is a mechanical side view of the entire packaging device incorporating the device of this invention, FIG. 2 is a perspective view of the cutting device, and FIG. 3 is a diagram showing the cutting member. FIG. 4 is a side view of the cutting device projecting into the transport path of the packaging material strip;
The figure is a side view of the cutting device with the cutting member retracted and held, FIG. 5 is a side view of the cutting device showing the state in which the engaging claws are removed, and FIG. 6 is a perspective view showing an example of the continuous bag belt F. figure,
FIG. 7 is a perspective view of a serrated cutter, and FIG. 8 is a perspective view of a cutter with cutting edges. Code in the figure, F...Packaging material band, 13...
・Transfer path, 14...Member for cutting material, 15.--
---orad, 16... Machine frame, 17...
・Spring, 18・Curved cam receiving member, 19・・Latching portion, 20・・Engagement pawl, 21・・Curved・Sequence operation shaft, 22, 23・・・Curved cam, 24・...Spring.

Claims (1)

[Scope of utility model registration request] When a pair of welds are in pressure contact with each other and sandwich a continuous bag band connected by discontinuous cuts, a discontinuous cut cutting member is placed near the welds that protrudes into the transfer path of the continuous bag band and retreats. The cutting member is attached to the machine frame and is slidably equipped, and the tip of the cutting member is biased by a spring to a position where it projects into the transfer path, and when it is in the retreated position, A holding claw is provided on the machine frame, and the machine frame includes a cam that retracts the rod from the protruding position to a position where it engages with the hook, and a cam that removes the hook and reciprocates the welded parts. 1. A cutting device in a packaging device, characterized in that the cutting device is fixed to a sequence operating shaft having a sequence operation shaft.