JP2005154048A - Intermittent feeding mechanism, intermittent feeding method, and automatic packaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic packaging device, in which loosening in continuous bags can be prevented in simpler structure than step rollers to reduce manufacturing cost. <P>SOLUTION: This automatic packaging device 1 is provided with a winding shaft 3 around which a plurality of bags 21 connected to each other through perforations 22 into a strip of connected bags 2 are to be wound, and a feed roller 4 to intermittently feed the connected bags 2 one by one. The automatic packaging device 1 is also provided with a DC motor 7 to provide brake torque to the winding shaft 3, a gear 6 and a gear part 71 to boost brake torque from the DC motor 7 to be transmitted to the winding shaft 3, a short-circuiting switch 81 to short-circuit or open the short-circuiting circuit 8 connected to the DC motor 7, and a switch control device 9 to control the short-circuiting switch 81 corresponding to feed timing of the feed roller 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an intermittent conveyance mechanism, an intermittent conveyance method, and an automatic packaging device for intermittently conveying a long workpiece.

  Generally, as a device that automatically packs items such as medicines and electronic parts in a bag, it transports a belt-shaped connecting bag in which a plurality of bags are connected together through a perforation, and then packs the bag into the bag An automatic packaging device that seals the opening and separates the bag from the perforation is known (see, for example, Patent Document 1). In such an automatic packaging device, one bag is connected by an intermittent transport mechanism including a winding shaft around which a belt-shaped connection bag is wound and a transport roller that intermittently pulls and transports the connection bag from the winding shaft. It is transported one by one.

  By the way, in the intermittent conveyance mechanism described above, since the winding shaft that rotates along with the conveyance of the connection bag rotates even after the conveyance roller stops due to its inertia, the belt-like connection bag is loosened between the conveyance roller and the rotation shaft. After that, there is a problem that it becomes difficult to transport the connecting bags one by one. Therefore, conventionally, to solve such a problem, a step roller that reciprocates in a direction orthogonal to the conveying direction of the connection bag is appropriately added with the weight of the step roller to the connection bag. A constant tension was applied to the bag to prevent the connection bag from sagging.

JP-A-10-194212 (paragraphs 0020-0022, FIG. 2)

  However, in the structure using the step roller as described above, since a complicated mechanism for reciprocating the step roller is required, the manufacturing cost is increased accordingly. In addition, it is necessary to secure a space for reciprocating the step roller in the automatic packaging apparatus, and the entire apparatus is large.

  Therefore, in the present invention, an intermittent transport mechanism, an intermittent transport method, and a manufacturing cost can be reduced without increasing the size of the entire apparatus by preventing the connection bag from slacking with a simpler structure than the step roller. An object is to provide an automatic packaging device.

  The invention according to claim 1 of the present invention that solves the above-described problems includes a winding shaft for winding a long workpiece in a roll shape, and a conveyance roller that intermittently conveys the workpiece. A DC motor that applies braking torque to the winding shaft, a gear mechanism that increases braking torque from the DC motor and transmits the braking torque to the winding shaft, and a circuit to which the DC motor is connected Short-circuiting switch for short-circuiting or opening-up, and control means for controlling the short-circuiting switch corresponding to the transport timing of the transport roller.

  In the intermittent conveyance mechanism configured as described above, when a roll-shaped work around which a conveyance roller is wound around a winding shaft is intermittently sent out at a predetermined conveyance timing, the short-circuit switch is turned on by the control means and the DC motor is connected. The short circuit is transmitted, and the braking torque of the DC motor is transmitted to the winding shaft through the gear mechanism. In addition, the intermittent transport mechanism, when a predetermined time has elapsed after stopping the transport roller, turns off the short-circuit switch by the control means to open the circuit to which the DC motor is connected, and the braking torque applied to the winding shaft To cancel. Therefore, according to this intermittent conveyance mechanism, when the workpiece is conveyed by intermittently moving the conveyance roller, the braking torque can be applied to or released from the winding shaft by appropriately switching the short-circuit switch by the control means. Therefore, it is possible to restrict the rotation due to the inertia of the winding shaft that occurs when the transport roller is stopped. Further, by providing a gear mechanism that increases the braking torque of the DC motor, the rotation of the winding shaft can be restricted even if the braking torque generated by the DC motor is small.

  The invention according to claim 2 includes a winding shaft for winding a belt-like connection bag in which a plurality of bags are integrally connected, and a conveyance roller for intermittently conveying the connection bag one bag at a time. A DC motor that applies a braking torque to the winding shaft, a gear mechanism that increases the braking torque from the DC motor and transmits the braking torque to the winding shaft, and a circuit to which the DC motor is connected Short-circuiting switch for short-circuiting or opening-up, and control means for controlling the short-circuiting switch corresponding to the transport timing of the transport roller.

  The automatic packaging device configured in this manner is a circuit in which a DC motor is connected by turning on a short-circuit switch by a control means when a connection bag having a conveyance roller wound around a winding shaft is intermittently sent out at a predetermined conveyance timing. And the braking torque of the DC motor is transmitted to the winding shaft through the gear mechanism. In addition, the automatic packaging device, when a predetermined time has elapsed after stopping the conveying roller, turns off the short-circuit switch by the control means to open the circuit to which the DC motor is connected, and the braking torque applied to the winding shaft To cancel. Therefore, according to this automatic packaging device, when supplying the connection bags one by one by intermittently moving the transport roller, the control means switches the short-circuit switch appropriately to apply / release braking torque to the winding shaft. Since this can be performed, the rotation due to the inertia of the winding shaft that occurs when the conveying roller is stopped can be restricted. Further, by providing a gear mechanism that increases the braking torque of the DC motor, the rotation of the winding shaft can be restricted even if the braking torque generated by the DC motor is small.

  According to a third aspect of the present invention, there is provided an intermittent conveying method in which a long workpiece wound around a winding shaft in a roll shape is intermittently sent via a conveying roller disposed at a predetermined position in the workpiece feeding direction. A step of applying a braking torque to the winding shaft after activation of the conveying roller, and a step of releasing the braking torque applied to the winding shaft before the next activation of the conveying roller. To do.

  According to such an intermittent conveyance method, first, the conveyance roller is activated to start conveyance of a long workpiece wound around the winding shaft in a roll shape, and then a braking torque is applied to the winding shaft. Then, the braking torque applied to the winding shaft is released before the next activation of the conveyance roller (for example, after the conveyance roller is stopped until the next activation). For this reason, since the braking torque applied to the winding shaft is always released when the transport roller is started, the winding shaft rotates smoothly when the transport roller is started. Thereby, it is possible to prevent an excessive force from being applied to the work when the transport roller is started. Further, in the method of applying braking torque to the winding shaft or releasing the applied braking torque, for example, a simple structure in which a circuit connected to a DC motor is short-circuited or opened can be used.

  According to the first aspect of the present invention, since the gear mechanism, the DC motor, and the circuit that require less space than the step roller and have a simple structure prevent the workpiece from loosening, the intermittent conveyance mechanism as a whole is large. In addition, the manufacturing cost can be reduced.

  According to the second aspect of the present invention, since the gear mechanism, the DC motor, and the circuit, which require less space than the step roller and have a simple structure, prevent the connection bag from being loosened, The manufacturing cost can be reduced without increasing the size.

  According to the third aspect of the present invention, for example, braking torque can be applied to and released from the winding shaft using a simple structure that short-circuits or opens a circuit to which a DC motor is connected. Compared to the overall size of the apparatus, the manufacturing cost can be reduced.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a perspective view showing an automatic packaging device according to the present embodiment, and FIG. 2 corresponds to the rotational speed when the rotating shaft of the DC motor is rotated without load, and to this rotational speed. It is a graph which shows the remaining rotation speed of a rotating shaft. FIG. 3 is a side view showing the operation of the automatic packaging device, (a) is a side view showing a state where the transport roller is driven to rotate, and (b) is a side view showing a state where the short-circuit switch is turned on. (C) is a side view which shows the state which stopped the conveyance roller, (d) is a side view which shows the state which turned off the short circuit switch.

  As shown in FIG. 1, an automatic packaging device (intermittent conveyance mechanism) 1 includes a winding shaft 3 for winding a belt-like connection bag (long work) 2 in a roll shape, and a connection from the winding shaft 3. A transport roller 4 for pulling out and transporting the bag 2 and a transport roller rotating mechanism 5 for driving the transport roller 4 to rotate intermittently are mainly provided. Further, the automatic packaging device 1 includes a gear 6 provided coaxially with the winding shaft 3, a DC motor (DC motor) 7 that engages with the gear 6, and a short circuit 8 to which the DC motor 7 is connected. A switch control device (control means) 9 is provided for controlling a short-circuit switch 81 provided in the short-circuit circuit 8 in accordance with the transport timing of the transport roller 4.

  The connecting bag 2 is a bag in which a plurality of bags 21 are integrally connected through perforations 22. Moreover, each bag 21 is connected with its opening 21a aligned in one direction (winding shaft 3 side).

  Both ends of the winding shaft 3 are rotatably supported by an apparatus body (not shown) of the automatic packaging apparatus 1. Therefore, the winding shaft 3 is rotated by the movement of the connecting bag 2 each time the connecting bag 2 set as a wound ball is conveyed one by one. The connecting bag 2 set on the winding shaft 3 is set on the conveying roller 4 after the tip thereof is hung on a guide bar G disposed above the winding shaft 3.

  The conveyance roller 4 is mainly composed of a pair of rollers 41 and 42 disposed with the connecting bag 2 sandwiched between the upper and lower sides, and the lower (one) roller 41 is rotationally driven by the conveyance roller rotation mechanism 5. The upper (other) roller 42 is rotated by following the lower roller 41. Further, the transport roller 4 is intermittently driven by the transport roller rotating mechanism 5 to draw the connecting bag 2 from the winding shaft 3 side and intermittently transport the bag one by one downstream. A device that supplies air to the opening 21a of the bag 21 to open the opening 21a, a device that supplies components to the opened opening 21a, and the opening 21a are sealed on the downstream side of the conveying roller 4. However, since the structure is the same as the conventional one, the description thereof will be omitted.

  The transport roller rotating mechanism 5 includes a motor (not shown) for driving the roller 41 therein, and the driving force from the motor is driven through a plurality of gears and a belt wound around these gears. 41 is a mechanism for transmitting to 41. Further, the transport roller rotating mechanism 5 is appropriately controlled so that its internal motor is intermittently operated at a predetermined time by a control device (not shown). Since this control is the same as in the prior art, a detailed description is omitted. However, in brief explanation, this control is performed when the connecting bag 2 is conveyed at a predetermined pitch (distance between two adjacent perforations 22). In this way, the motor in the transport roller rotating mechanism 5 is intermittently driven.

  The gear 6 is formed to have a larger diameter than the winding shaft 3 and is coaxially fixed to the winding shaft 3. And the tooth | gear part 61 formed in the outer peripheral surface of this gear 6 meshes | engages with the gear part 71 of the DC motor 7. FIG. The gear 6 and the gear portion 71 of the DC motor 7 correspond to a “gear mechanism”. Further, the gear 6 and the gear portion 71 may be configured to mesh with each other via another gear (not shown). Further, the gear ratio between the gear 6 and the gear portion 71 is determined by the relationship between the feed pitch of the connecting bag 2 and the braking torque of the DC motor 7 (including the resistance value of the variable resistor 82 described later). Incidentally, the gear ratio between the gear 6 and the gear portion 71 in this embodiment is 10: 1. The gear ratio is not limited to this embodiment, and can be arbitrarily changed.

  The DC motor 7 has a structure in which an armature around which a coil is wound rotates between opposing permanent magnets. When a direct current is supplied to the coil, the DC motor 7 functions as a prime mover, and the rotating shaft 72 is rotated by an external force. Then, it functions as a generator. In the present embodiment, the load (braking torque) is applied to the gear 6 around which the DC motor 7 rotates by causing the DC motor 7 to function as the latter generator. The gear portion 71 formed at the tip of the rotating shaft 72 of the DC motor 7 is formed to have a smaller diameter than the gear 6.

  The short circuit 8 is a circuit in which a DC motor 7, a short circuit switch 81 that short-circuits or opens the short circuit 8, and a variable resistor 82 are arranged in series. This is a circuit for short-circuiting / opening the general circuit 8. In this embodiment, the resistance value of the variable resistor 82 is fixed to substantially zero (R≈0). However, the present invention is not limited to this, and the resistance value of the variable resistor 82 is arbitrarily set. It can be set.

  The difference in the characteristics of the DC motor 7 when the resistance value of the variable resistor 82 is changed will be described below with reference to FIG. As shown in FIG. 2, when the resistance value is R = ∞ (when the short circuit 8 is not short-circuited), the rotating shaft 72 of the DC motor 7 is rotated by an external force at a rotational speed of, for example, 1000 rpm. When this external force is removed, the rotating shaft 72 then rotates about 20 rotations and stops. On the other hand, when the resistance value is R = 20Ω and the rotating shaft 72 is rotated at a rotational speed of 1000 rpm, the remaining rotational speed after removing the external force is about 7 rotations, which is smaller than when R = ∞. It becomes. Furthermore, when the resistance value is R = 0Ω and the rotating shaft 72 is rotated at a rotation speed of 1000 rpm, the remaining number of rotations after removing the external force is about 5 rotations, which is smaller than when R = 20Ω. . From the above, it can be seen that the smaller the resistance value, the more difficult it is for the rotating shaft 72 to rotate. Therefore, the braking effect by the DC motor 7 increases as the resistance value decreases.

  As shown in FIG. 1, the switch control device 9 performs a short circuit of the short circuit 8 from the start to the stop of the transport roller 4 and opens the short circuit 8 from the stop of the transport roller 4. The short-circuit switch 81 is controlled to be performed before the next start-up. Specifically, the switch control device 9 includes two counters C1 and C2 that count for a predetermined time t1, t2 (t1 <t2) after the conveyance roller 4 is started, and when the counter C1 counts the predetermined time t1. The short-circuit switch 81 is turned on, and when the counter C2 counts for a predetermined time t2, the short-circuit switch 81 is turned off. The predetermined times t1 and t2 are both set within a range of time required from the current activation of the conveying roller 4 to the next activation.

  The switch control device 9 is configured to start in synchronization with the transport roller rotation mechanism 5. In order to synchronize the switch control device 9 and the transport roller rotation mechanism 5 in this way, for example, to intermittently start the transport roller rotation mechanism 5 transmitted from the control device that controls the transport roller rotation mechanism 5. This signal may be transmitted to the switch control device 6 and the switch control device 6 may be configured to intermittently start in response to this signal.

Next, operation | movement of this automatic packaging apparatus 1 is demonstrated.
As shown in FIG. 3A, first, by driving a motor in the transport roller rotating mechanism 5, the transport roller 4 is driven to rotate and the transport of the connecting bag 2 is started. At this time, since the short-circuit switch 81 is OFF, the winding shaft 3 rotates smoothly.

  As shown in FIG. 3B, when a predetermined time t1 has elapsed since the start of the conveying roller 4 (for example, when the downstream perforation 22A has advanced a predetermined distance from the point A in the figure), the switch control device 9 As a result, the short-circuit switch 81 is turned ON. As a result, the winding shaft 3 that rotates with the movement of the connecting bag 2 is rotated while being braked by the DC motor 7 via the gear 6, and the connecting bag 2 is conveyed with a predetermined tension without being loosened. It becomes. At this time, the braking torque generated from the DC motor 7 is increased by the gear portion 71 (see FIG. 1) and the gear 6 and transmitted to the winding shaft 3.

  Subsequently, as shown in FIG. 3C, when the connecting bag 2 is conveyed by one bag (when the upstream perforation 22B reaches the point A in the figure), the conveying roller 4 is conveyed by the conveying roller rotating mechanism 5. Stops. At this time, the winding shaft 3 around which the connecting bag 2 is wound tends to rotate due to inertia, but the rotation is restricted by the DC motor 7. When a predetermined time t2 has elapsed since the previous activation of the conveying roller 4 (when a predetermined time “t2-t1” has elapsed since the conveying roller 4 was stopped), as shown in FIG. The short-circuit switch 81 is turned off by the device 9. Thereafter, by repeating the above-described operation, the connecting bags 2 are transported satisfactorily one by one.

According to the above, the following effects can be obtained in the present embodiment.
The slack of the connecting bag 2 is prevented with a simple structure comprising the gear 6, the DC motor 7, the short circuit 8 and the switch control device 9, so that the entire automatic packaging device 1 is not enlarged and the manufacturing cost is reduced. Can do. Moreover, since the DC motor 7 can regulate the rotation of the winding shaft 3 with a small braking torque by engaging with the gear 6 having a diameter larger than that of the winding shaft 3, the DC motor 7 itself can be downsized. be able to. Further, since no load is applied to the winding shaft 3 by the DC motor 7 when the conveying roller 4 is started, the perforation 22 is not cut between the conveying roller 4 and the winding shaft 3, and the connecting bag 2 is securely connected. It can be transported as a unit.

As mentioned above, this invention is implemented in various forms, without being limited to the said embodiment.
In this embodiment, the resistance value of the variable resistor 82 is fixed to R≈0, but the present invention is not limited to this. For example, by providing a control device that changes the resistance value of the variable resistor 82 according to the torque of the winding shaft 3, the braking torque of the DC motor 7 may be changed as appropriate according to the torque change of the winding shaft 3. Good.

  In the present embodiment, the gear mechanism is configured by two gears (gear 6 and gear portion 71), but the present invention is not limited to this, and the gear mechanism may be configured by three or more gears. Moreover, in this embodiment, although this invention was applied to the automatic packaging apparatus 1, this invention may be applied to what kind of apparatus as long as it is an intermittent conveyance mechanism which conveys a elongate workpiece | work intermittently.

It is a perspective view which shows the automatic packaging apparatus which concerns on this embodiment. It is a graph which shows the rotational speed when rotating the rotating shaft of a DC motor without a load, and the residual rotation speed of the rotating shaft corresponding to this rotating speed. It is a side view which shows operation | movement of an automatic packaging apparatus, (a) is a side view which shows the state which rotated the conveyance roller, (b) is a side view which shows the state which turned on the short circuit switch, (c) is conveyance The side view which shows the state which stopped the roller, (d) is a side view which shows the state which turned off the short circuit switch.

Explanation of symbols

1 Automatic packaging equipment (intermittent transport mechanism)
2 Connecting Bag 21 Bag 21a Opening 22 Perforation 3 Winding Shaft 4 Conveying Roller 5 Conveying Roller Rotating Mechanism 6 Gear 7 DC Motor 71 Gear Unit 72 Rotating Shaft 8 Short Circuit 81 Shorting Switch 82 Variable Resistor 9 Switch Controller (Control) means)

Claims (3)

A winding shaft for winding a long workpiece into a roll, and
An intermittent conveyance mechanism comprising a conveyance roller for intermittently conveying the workpiece,
A DC motor for applying a braking torque to the winding shaft;
A gear mechanism for increasing the braking torque from the DC motor and transmitting it to the winding shaft;
A short-circuit switch for short-circuiting or opening a circuit to which the DC motor is connected;
And a control means for controlling the short-circuit switch in accordance with the transport timing of the transport roller. A winding shaft for winding a belt-like connecting bag in which a plurality of bags are integrally connected;
A conveying roller that intermittently conveys the connecting bag one bag at a time,
A DC motor for applying a braking torque to the winding shaft;
A gear mechanism for increasing the braking torque from the DC motor and transmitting it to the winding shaft;
A short-circuit switch for short-circuiting or opening a circuit to which the DC motor is connected;
And a control means for controlling the short-circuit switch in correspondence with the transport timing of the transport roller. In an intermittent conveyance method of intermittently sending a long workpiece wound around a winding shaft in a roll shape via a conveyance roller arranged at a predetermined position in the workpiece feeding direction,
Applying braking torque to the winding shaft after activation of the transport roller;
Releasing the braking torque applied to the winding shaft before the next activation of the transport roller.

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