JP2005132553A - Turnover device for tray - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact turnover device for discharging pouches remaining in a tray by turning over the tray after taking out retort pouches by an unloader which requires less space, accurately rotatable by 180°, less causes trouble, and enables stable operation. <P>SOLUTION: A turnover shaft 5 is installed at the center of a turnover part 1, the tray T is carried in by a chain conveyor 8 disposed at the turnover part, the tray is directed downward by rotating the turnover part by 180°, the residual pouches are discharged from the tray, the turnover part is rotated again by 180°, and the tray is discharged from the chain conveyor. The turnover shaft is connected to the output shaft 35 of an index unit 32, and accurately rotated by 180°. A cam is fixed to the bottom end of the input shaft 33 of the index unit, a slide shaft 65 positioned concentrically to the turnover shaft is moved advanced and retreated according to the rotation of the cam, and holding claws 41 to 44 are opened and closed at a specified timing through a transmission mechanism disposed at the turnover part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reversing device for a retort processing tray that reverses a tray carried in a reversing unit in an upward horizontal state together with the reversing unit, and then reverses the tray together with the reversing unit and then discharges the tray.

  For retort packaging, for example, retort pouches filled with contents are placed and placed on a tray by a loader, the trays (actual trays) are stacked, placed in a retort kettle, sterilized with pressurized hot water, and then pulled out. Then, the processed retort pouch is taken out of the tray by an unloader (for example, using vacuum suction), dried and boxed. However, the retort pouch may remain on the tray (empty tray) after the retort pouch is taken out by the unloader due to a take-out error. The remaining retort pouch needs to be removed before the empty tray is used for the next retort process.

In order to remove the retort pouch remaining in the empty tray, use of a reversing device is considered. A conventional reversing device is used as an unloader as disclosed in, for example, Patent Documents 1 and 2 below.
The reversing device disclosed in Patent Document 1 includes a horizontal tray frame 2 and a roller plate 6 tilted downwardly disposed on the operation table 1. The tray frame 2 fixes the tray in a detachable manner, and the front end side pivots. The roller plate 6 is attached to the support shaft 5 and can be reversed, and the rear end side of the roller plate 6 is attached to the pivot shaft and can be reversed. All the operations of the reversing device are performed manually. First, the tray 3 is placed and fixed on the tray frame 2, the roller plate 6 is reversed and covered on the tray 3, and the tray frame 2 and the roller plate 6 are covered. When the tray frame 2 and the tray 3 are finally reversed backward, the retort food R slides down on the roller 8. The numbers and symbols listed here correspond to those described in Patent Document 1.

  The reversing device disclosed in Patent Document 2 is extended with a tray support means 4 provided with an air cylinder 4a and detachably supporting the tray, and an article support means 5 provided with a belt conveyor 51 driven by a motor 5d. Further, the tray support means 4 and the article support means 5 are reversed through the arms 2 and 3 and the reversing means (shaft 1) is reversed. In this reversing device, first, the tray T stopped at a predetermined position below the tray support means 4 is lifted by the lifter 7, the air cylinder 4 a is operated to support the tray T on the tray support means 4, and the article support means 5. Is turned leftward about the axis 1 and stacked on the tray support means 4 from above to hold the bag on the tray T, and the tray support means 4 and the article support means 5 are turned together around the axis 1 to the right, and then the tray support. Only the means 4 is reversed to the left and returned to the original position. On the other hand, on the article support means 5 side, the bag is discharged by the belt conveyor 51. The numbers and symbols listed here correspond to those described in Patent Document 2.

JP-A-8-104419 JP 2002-114360 A

All of the conventional reversing devices exemplified above are configured to make a large rotation with the reversing portion being away from the tray as a fulcrum. Therefore, since the inertia of the reversing portion is large, acceleration is not effective, and it takes time to reverse, and one tray is finally discharged by one reciprocal reversal. Moreover, the apparatus becomes large and requires a large space.
On the other hand, these problems are solved by setting the rotation fulcrum of the reversing part at the center of the reversing part. That is, a reversing shaft is provided at the center of the reversing portion, the reversing portion is rotated 180 degrees around the reversing axis, and an upward tray is loaded into the reversing portion, and the reversing portion is rotated 180 degrees to The retort pouch is discharged from the tray that has been directed downward at this time, and then the reversing unit is rotated again by 180 degrees to return the empty tray to the original upward position and carried out of the reversing unit. .

  However, this case also has the following problems. First, when a normal motor is used as the drive source, it is difficult to rotate the reversing unit accurately by 180 degrees, and the acceleration at the start and the deceleration at the stop tend to be difficult, and an extra load is applied to the drive unit. Take it. If a servo motor is used as the drive source, acceleration / deceleration can be set arbitrarily, and the reversing unit can be rotated accurately. However, the servo motor needs to issue a command signal by the control device every time it is operated. The possibility of failure is relatively high. In addition, the tray carried into the reversing unit needs to be held so as not to drop off from the reversing unit when reversing. As the holding means, a conventional air cylinder (see Patent Document 2) is used as the reversing unit. It is necessary to lay an air cylinder pipe in the reversing part and install a rotary joint on the reversing shaft to connect to the pressurized air source arranged in the non-reversing part. There is a concern that the service life may be reduced and a failure may occur. Moreover, if the processing capacity of the air cylinder is increased, there is a problem that the operation speed and the operation timing are not stable. Further, when the tray is carried into the reversing unit by a conveying means such as a belt conveyor, for example, a sensor for detecting the position of the tray is provided in the reversing unit in order to accurately position the tray at a predetermined position of the reversing unit. When the tray is detected, the belt conveyor may be stopped, and the tray may be stopped at the predetermined position. In this case, the sensor wiring is laid in the reversing section, and the wiring is not connected via the rotary joint. It is necessary to draw it out to the reversing unit (control device), which also causes a failure due to the complexity of the structure.

The present invention has been made in view of such problems relating to the case where the residual pouch is discharged from the tray after the retort pouch is taken out by the unloader, and the reversing device used as the unloader itself.
Therefore, the present invention provides a reversing shaft at the center of the reversing section, the reversing section rotates 180 degrees around the reversing axis, and an upward tray is carried into the reversing section. Rotate to turn the tray downward, discharge the retort pouch from the tray turned downward at this time, then rotate the reversing part again by 180 degrees, and return the empty tray to the original upward position, Assuming a reversing device of the type that is carried out outside, work efficiency is good, compact and does not require a large space, can be reversed 180 degrees more accurately, and can be operated stably with few failures. The object is to obtain a device.

  The present invention reverses the tray loaded in the reversing portion in the upwardly horizontal state together with the reversing portion, discharges the retort pouch in the tray, and then reverses the empty tray again with the reversing portion, and then carries it out. In the tray reversing device, the reversing unit has a reversing axis at its center and is rotatable about the reversing axis, and the tray loading position is set on both sides across the reversing axis, and the reversing unit Reversing means for rotating the section 180 degrees at a time, and tray transporting means for carrying in and out of the tray to the loading position of the reversing section and having the same transporting direction during loading and unloading And holding claws installed at the front and rear positions in the vicinity of the two loading positions of the reversing unit, respectively, as viewed from the conveying direction, and the loading claws hold the tray at the respective loading positions from the front and rear. Tray holding means for holding in position, and further, the reversing means includes a motor as a drive source and an index unit for inputting rotation of the motor, and an output shaft of the index unit is coupled to the reversing shaft, The tray holding means includes a clamping claw opening / closing cam that is connected to the motor and rotates, and the cam is connected to the clamping claw through a transmission mechanism. The reversal of the reversing unit may be rotated in the same direction by 180 degrees, or may be rotated forward and reverse by 180 degrees.

  The operation of each requirement constituting the reversing device is described as follows. (1) Since the tray loading position is set on both sides of the reversing unit with the reversing shaft interposed therebetween, and the clamping claws are arranged in the vicinity of both loading positions, one tray is placed every 180 degrees of reversing of the reversing unit. It is possible to accept and discharge the retort pouch, and the work efficiency is high. In addition, since the transport direction of the tray transport means is the same when the tray is loaded and unloaded, the tray can be unloaded from the reversing unit and the tray can be loaded into the reversing unit at the same time. improves. (2) The clamping claws are arranged at the front and rear positions when viewed from the conveyance direction, and the trays at the respective loading positions are clamped from the front and rear by the clamping claws, so that even if the position of the loaded trays is slightly shifted in the front and rear direction of the conveyance direction, After clamping, it is accurately positioned at the carry-in position. (3) An index unit is provided as a reversing means, the rotation of the motor is input to the index unit, and the output shaft is connected to the reversing shaft, so that the reversing shaft can be accurately rotated 180 degrees (intermittent indexing). Become. The input shaft of the index unit can also be rotated in the reverse direction. If the input shaft is sequentially rotated forward and backward, the reversing unit is rotated forward and backward by 180 degrees. Further, as the characteristics of the index unit, there is an advantage that the rotation speed of the output shaft, the acceleration at the start and the deceleration at the stop can be arbitrarily set. (4) Since the cam is rotated using the motor of the drive source of the reversing means, and the clamping claw is mechanically opened and closed by the cam via the transmission mechanism, if the opening / closing timing is set first, Every time the motor rotates, the same thing is repeated mechanically and there are few failures. Moreover, even if the processing capability of the reversing device is increased, the operation of the clamping claws is stable.

In the tray holding means, all of the clamping claws can be opened and closed simultaneously. At this time, the opening and closing of the clamping claws accompanying the rotation of the cam is set so that it is closed before the reversing part is reversed to hold the tray, and is opened after the reversing to release the tray. In this case, it is necessary to arrange some stopper so that the tray that is turned 180 degrees and comes to the lower side does not fall off from the turning portion. Alternatively, the opening / closing timings of the holding claws corresponding to one loading position of the reversing unit and the holding claws corresponding to the other loading position can be changed (alternately). Specifically, when a new tray is loaded into the loading position, the clamping claw corresponding to the loading position (the clamping claw corresponding to the upper loading position) is closed, and the clamping claw rotates 360 degrees and again moves upward. The timing is set to close until it is reversed. In this case, for example, if the clamping force of the clamping claws is strong, or if the upper end of the tray is hooked with the leading end as a key shape, the tray that has been turned 180 degrees and turned down is reversed even without the stopper. There is no need to drop off the part.
It should be noted that at the both carry-in positions of the reversing unit, the structure of the reversing unit is set at a position slightly higher than the upper end of the tray carried into the carry-in position and covering both edges of the tray along the tray transport direction. As a part, it is possible to install a tray stopper as needed to prevent the tray that is turned upside down from falling down.

As a specific form, the transmission mechanism of the tray holding means includes a downstream transmission mechanism installed in the reversing unit and rotating together with the reversing unit, and an upstream transmission mechanism installed in the non-reversing unit. In addition, a non-inversion part refers to the part which does not rotate with an inversion part. The downstream transmission mechanism includes a slide shaft that is concentric with the reversing shaft, rotates with the reversing shaft inside the reversing shaft, and is installed to be movable in the axial direction of the reversing shaft to transmit the power of the cam. The slide shaft is coupled to the upstream transmission mechanism via a joint member so as to be rotatable relative to the slide shaft. Due to the arrangement of the slide shaft and the intervention of the joint member, the rotation of the cam can be transmitted to the clamping claw with a simple structure without the need for a rotary joint or the like even though the clamping claw is arranged at the reversing part. .
In this case, it is desirable to dispose an overload absorbing member (for example, an air cylinder, a spring, etc.) in the upstream transmission mechanism and transmit power to the downstream transmission mechanism via the overload absorbing member. The overload absorbing member serves to prevent the movement of the upstream transmission mechanism from being transmitted to the downstream transmission mechanism when the downstream transmission mechanism is overloaded. For example, when an overload absorbing member is used as an air cylinder, this is connected in series with the slide shaft via the joint member, and the air is compressed in the direction in which the piston rod is contracted or expanded depending on the overload direction to be absorbed. Introduce pressure. As a result, even if there is a danger that the tray is not accurately loaded into the loading position of the reversing unit and the clamping claws are overloaded, the air cylinder absorbs the overload, and the tray and tray holding means Damage can be prevented.

When the tray transport unit transports the tray from the outside of the reversing unit to the loading position of the reversing unit, the reversing unit moves between the detection position and the non-detection position in order to accurately stop the tray at the loading position. It is desirable that a tray detection piece that is made free, a biasing unit that constantly biases the tray detection piece toward the non-detection position, and a detection sensor are installed in the non-reversing portion. By installing the detection sensor in the non-inversion part, it is possible to control the tray conveying means without requiring wiring in the inversion part or installation of a rotary joint or the like. When the tray detection piece is pushed by the tray conveyed to the reversing unit and moves from the non-detection position to the detection position, the detection sensor detects it and a detection signal is sent to the control device. Based on the signal, the conveyance of the tray conveying means is stopped.
In this detection method, the tray loaded horizontally in the reversing unit is reversed together with the reversing unit, the retort pouch in the tray is discharged, and then the empty tray is reversed again together with the reversing unit. The tray reversing device in general that is to be discharged afterwards can be applied to tray conveying means for carrying the tray into the reversing section.

  The tray conveying means is, for example, a conveyor installed in the reversing unit. The tray is carried in a horizontal state by this conveyor, and reaches the carry-in position while being placed on the conveyor. In this case, a driving force of a motor (a motor different from the motor of the reversing unit) installed in the non-reversing unit is appropriately transmitted to the conveyor via a transmission mechanism, and the conveying direction is the reversing shaft. It is perpendicular to the axial direction. In addition, conveying a tray to the said conveyor, or conveying the tray discharged | emitted from the said conveyor further to the next process is performed by another conveyance means. As the conveyor, a belt conveyor, a chain conveyor, a roller conveyor, or the like can be used. Alternatively, the tray conveying means is not installed in the reversing unit, and the tray conveying means (for example, a pusher) installed in the non-reversing unit is used to move to the loading position of the reversing unit. It is also possible to carry in the tray and carry out the tray from the carry-in position.

  When the reversing device described above is used as an unloader, there is a problem that a large number of retort pouches that are placed in line with the tray are randomly dropped. In order to take out the retort pouch in an aligned state, two belt conveyors can be added to the reversing device. That is, a belt conveyor is disposed as a part of the structure of the reversing unit on both carry-in positions of the reversing unit, and this can be moved in a direction perpendicular to the surface of the tray. Touch the retort pouch placed on the tray to hold it. When the tray is loaded into the loading position of the reversing unit, the belt conveyor moves to the tray side and presses the retort pouch, and prevents the retort pouch from falling during the reversing of the reversing unit. The belt conveyor is separated from the tray side, and the retort pouch placed on the tray is transferred in an aligned state on the conveyor belt. Subsequently, the belt conveyor starts conveyance and carries the retort pouch out of the reversing device. The driving of the conveyor belt is performed by appropriately transmitting the driving force of a motor (a motor different from the conveyor belt as the tray conveying means) installed in the non-reversing unit through a transmission mechanism.

  According to the present invention, it is possible to obtain a reversing device that has a high work efficiency, is compact and does not require a large space, can be reversed 180 degrees more accurately, and can be stably operated with few failures.

Hereinafter, the reversing device according to the present invention will be described with reference to FIGS.
The reversing device shown in FIGS. 1 to 6 is a reversing device mainly used when discharging the residual pouch from the tray after the retort pouch is taken out by the unloader.
In this reversing device, the reversing unit 1 has a reversing shaft 5 rotatably supported by a bearing member 4 fixed on the upper surface plate 3 of the frame 2, and a substantially U-shaped cross section fixed to the reversing shaft 5. A pair of inversion frames 6 and a pair of beam members 7 and 7 connecting the both inversion frames 6 and 6 are configured.

  The reversing unit 1 is provided with a chain conveyor 8 serving as a tray conveying means. The chain conveyor 8 includes two feed shafts 11 and 12 supported by bearings 9 fixed to the reversal frame 6, a feed sprocket 13 fixed to both the feed shafts 11 and 12, two feed sprockets 13, It consists of a feed chain 14 spanned between 13. The chain conveyor 8 is driven by a motor (not shown) installed in the non-reversing portion, and a transmission mechanism for transmitting the driving force of the motor is rotatable on the sprocket 15 fixed to the feed shaft 11 and the reversing shaft 5. It consists of a supported double sprocket 16, a chain 17 that connects the two sprockets 15, 16, and a chain 18 that connects the motor and the sprocket 16.

In FIG. 1, a chain conveyor (not shown) is arranged on the supply side (right side) of the reversing device, and a tray T (tray before reversing treatment) is placed thereon, and also on the discharge side (left side) of the reversing device. A chain conveyor (not shown) is arranged, and a tray T (a tray after the reversal treatment) is placed thereon. Both chain conveyors are set to the same height as the horizontal chain conveyor 8.
On the chain conveyor 8, the tray T is placed at a position that overlaps the feed chain 14, and this position is set as the carry-in position in the present invention. The carry-in position is set on both sides of the reversing unit 1 (both front and back surfaces in FIG. 1).

The chain conveyor 8 needs to control its operation so that the tray T stops at the carry-in position set in the reversing device 1, so that a detection piece is installed in the reversing unit 1 as will be described next. The sensor is installed in the non-inversion part.
A detection shaft 21 is rotatably supported by a bearing 19 (see FIG. 2) fixed to the reversal frame 6, a tray detection piece 22 is fixed to the inner end of the detection shaft 21, and a detection dog 23 is fixed to the outer end. They are fixed (two sets symmetrically about the reversal axis 5). A spring hook 24 is fixed at an intermediate position of the detection shaft 21, and a tension spring 26 (see FIG. 4) is stretched between the spring hook 24 and the spring hook 25 fixed to the reversal frame 6. A single stopper 27 is fixed. On the other hand, a sensor (for example, a proximity sensor) 29 is fixed to the upper surface plate portion 3 of the frame 2 via an attachment member 28. When the tray T is not in the carry-in position, as shown by the phantom line in FIG. 5, the tray detection piece 22 protrudes above the feed chain 14 by the action of the tension spring 26, and its position (non-detection position) is the detection piece stopper. 27. At this time, the detection dog 23 is located below the sensor 29. When the tray T comes to the carry-in position and the tray detection piece 22 is pushed down to the same height (detection position) as the feed chain 14 as shown by the solid line in FIG. 5, the detection shaft 21 rotates and the detection dog 23 is moved. It is located in front of the sensor 29 and the sensor 29 detects it. When the detection signal is output when the tray T is carried in, a control device (not shown) stops the conveyance of the chain conveyor 8 based on the detection signal.

The reversing means includes a motor (not shown) and an index unit 32 installed on a subframe 31 fixed to the upper surface plate 2. A gear 34 is fixed to the input shaft 33 of the index unit 32 and is rotated by the motor. On the other hand, a gear 36 is fixed to the output shaft 35, which meshes with a gear 37 fixed to the reverse shaft 5. The index unit 32 converts (intermittently indexing) 360-degree continuous rotation of the input shaft 33 into rotation of a predetermined angle of the output shaft 35. The output shaft 35 is rotated in a predetermined manner after the input shaft 33 starts rotating. The output shaft 35 does not rotate until reaching an angle (for example, 60 degrees), and the output shaft 35 rotates by the predetermined angle by the subsequent rotation of the input shaft 33 (for example, 240 degrees). It does not rotate again at a rotation of degrees. Therefore, even if one rotation of the input shaft 33 deviates from an accurate rotation of 360 degrees, the rotation of the output shaft 35 at an accurate predetermined angle is achieved, whereby the reversing shaft 5 (reversing unit 1) is accurately rotated 180 degrees. Rotate. In addition, the acceleration at the start of the output shaft 35 and the deceleration at the time of stopping are set gently, and the intermediate speed is set to be large so that the reversing unit 1 and the reversing means are strongly accelerated and decelerated at the start of reversing and when the reversing is stopped. The time required for inversion can be shortened while preventing a load from being applied.
A detection piece 38 is installed on the gear 34 fixed to the input shaft 33 (see FIG. 3), and a sensor (for example, a proximity sensor) 39 is disposed above the rotation locus. These set the initial position of the input shaft 33 (and the stop position after one rotation). The input shaft 33 rotates in the same direction, and the reversing member 1 rotates in the same direction by 180 degrees.

  The tray holding means includes clamping claws 41 to 44 installed in the vicinity of the carry-in position of the reversing unit 1 (the front-rear position in terms of the conveyance direction of the chain conveyor 8). The clamping claws 41 to 44 are fixed to open / close shafts 45 to 48 disposed vertically near the front and rear end portions of the reversing unit 1, and the open / close shafts 45 to 48 are respectively supported by bearings 49 fixed to the reversal frames 6 and 6. It is supported rotatably. In this example, the opening and closing shafts 45 to 48 are simultaneously rotated as will be described later, and the holding claws 41 to 44 are simultaneously opened and closed accordingly. In the arrangement of FIG. 5, the holding claws 41 and 43 fixed to the lower opening and closing shafts 45 and 47 hold the tray T carried into the carrying-in position of the reversing unit 1 from the front and rear to bring the tray T into the carrying-in position. The tray T inverted downward is clamped from the front and rear by the clamping claws 42 and 44 fixed to the upper opening and closing shafts 46 and 48, and the tray T is held at the inverted loading position.

  As shown in FIG. 4, the opening / closing levers 51 and 52 are fixed to the ends of the opening / closing shafts 46 and 47 protruding from the reversal frame 6, and the driven levers 53 and 54 are similarly fixed to the opening / closing levers 45 and 48. 51 and the driven lever 53, and the opening / closing lever 52 and the driven lever 54 are meshed with gears formed at the tips. One end of a rod 55 is connected to each of the open / close levers 51, 52, while two fulcrum shafts 57 are symmetrically fixed to the reversal frame 6 via attachment portions 56, and the L-shaped levers 58, 58 is rotatably supported, and one end of the L-shaped lever 58 and the other end of the rod 55 are connected. The other ends of the L-shaped levers 58 and 58 are connected to a connecting shaft 61 that penetrates the reversing shaft 5 via a link 59. Reference numeral 62 denotes a spacer interposed between the link 59 and the reverse shaft 5.

As shown in FIG. 6, the reversing shaft 5 is formed with a through hole 63 that is perpendicular to the axial direction and passes through the axial center, and this is a long hole that is long in the axial direction of the reversing shaft 5. To penetrate. Further, a guide hole 64 extending from the axial end portion through the through hole 63 is formed at the axial center of the reversing shaft 5, and a slide shaft 65 concentric with the reversing shaft 6 is axially disposed in the guide hole 64. The end of the slide shaft 65 is fixed to the connecting shaft 61. When the slide shaft 65 moves back and forth in the axial direction of the reversing shaft 5, the connecting shaft 61 moves back and forth in the through hole 63.
The clamping claws 41 to 44 are closed at the time shown in FIGS. 5 and 6, but when the slide shaft 65 moves forward (moves to the right in FIG. 6) from the state of FIG. The levers 58 and 58 swing and the rods 55 are pulled in the direction of the L-shaped levers 58 and 58, and the opening and closing shafts 45 to 48 rotate to open the clamping claws 41 to 44.
The transmission mechanism from the open / close shafts 45 to 48 to the slide shaft 65 described above is installed in the reversing unit 1 and rotates together with the reversing unit 1. In the transmission mechanism of the tray holding means referred to in the present invention, Equivalent to.

As shown in FIG. 3, a groove cam 66 forming a part of the transmission mechanism of the tray holding means is fixed to the lower end of the input shaft 33 of the index unit 32, and a cam roller 68 attached to the tip of a cam lever 67 in the cam groove. I'm stuck. The cam lever 67 is fixed to the lower end of a fulcrum shaft 71 rotatably supported by a bearing 69 fixed to the subframe 31, and one vertex of the triangular lever 72 is fixed to the upper end of the fulcrum shaft 71. An air cylinder 73 as an overload absorbing member is connected to the other apex of the triangular lever 72, and the tip of the piston rod 74 is rotatable relative to the end of the slide shaft 65 via the joint member 75. It is linked to. Air pressure is introduced into the air cylinder 73 in a direction in which the piston rod 74 is always contracted from a pressurized air source (not shown). The opening and closing of the holding claws 41 to 44 accompanying the rotation of the groove cam 66 is closed before the reversing unit 1 is reversed (in the horizontal state) to sandwich the tray T, and is opened after the reversal (also in the horizontal state). Is set to release the tray T
The transmission mechanism from the groove cam 66 to the air cylinder 73 described above is installed in the non-reversing portion and does not rotate, and corresponds to the upstream transmission mechanism in the transmission mechanism of the tray holding means in the present invention.
When the groove cam 66 is rotated and the triangular lever 72 is rotated and the slide shaft 65 is retracted, the holding claws 41 to 44 are closed. If the claws 41 to 44 are blocked from closing, the transmission mechanism is overloaded. In this case, the piston rod 74 of the air cylinder 73 expands in accordance with the overload and absorbs the overload, so that the movement of the upstream transmission mechanism is not transmitted to the downstream transmission mechanism.

One end of a rod 76 is connected to the other apex of the triangular lever 72. On the other hand, a fulcrum shaft 77 is erected on the upper surface plate portion 3, and a positioning lever 78 is supported on the fulcrum shaft 77 so as to be horizontally rotatable, and the other end of the rod 76 is connected to a connecting portion 80 fixed to the positioning lever 78. Yes. The tip of the positioning lever 78 has a tuning fork shape (see FIG. 3), and when this fits into the extension of the feed shafts 11 and 12 (see the phantom line in FIG. 1), the reversing unit 1 is fixed and positioned horizontally. It is supposed to be.
In addition, as shown clearly in FIG. 6 in particular, the upper and lower sides of the reversing frame 6 are slightly higher than the upper end of the tray T loaded into the loading position of the reversing unit 1 and both of the trays T along the conveying direction of the tray T. A plate-like tray stopper 79 is fixed at a position covering the edge. The tray stopper 79 is a part of the structure of the reversing unit 1 and has a function of preventing the tray T, which is reversed and turned downward, from falling when released from the clamping claws 41 to 44.

Next, an example of the operation sequence of the reversing device will be described.
(1) The chain conveyor 8 and the other two chain conveyors (the supply side and the discharge side) described above are operated. The tray T on the chain conveyor 8 is unloaded and transferred onto the discharge-side chain conveyor, and the tray T transferred from the supply-side chain conveyor is placed on the chain conveyor 8 and loaded toward a predetermined loading position. Is done.
(2) The tray T coming to the carry-in position presses the tray detection piece 22 and the sensor 29 outputs a detection signal.
(3) Based on the detection signal, the control device stops the motor of the chain conveyor 8.
(4) At the same time, the control device activates the motor of the reversing means, and the input shaft 33 of the index unit 32 rotates. As the input shaft 33 rotates, the following operation is mechanically performed.
(4-1) As the groove cam 66 rotates, the triangular lever 72 rotates, the slide shaft 65 moves backward, the clamping claws 41 to 44 are closed, and the tray T stopped at the loading position is clamped from the front and rear.
(4-2) At the same time, the positioning lever 78 moves from the positioning position (imaginary line position in FIG. 1) to the release position (solid line position in FIG. 1).
(4-3) The output shaft 35 starts rotating, and the reversing unit 1 starts rotating.
(4-4) The rotation of the output shaft 35 stops, and the reversing unit 1 stops when it rotates 180 degrees. During this time, if there is a retort pouch remaining in the tray T, it is dropped and discharged by a conveyor or the like disposed below the reversing unit 1.
(4-5) As the groove cam 66 rotates, the triangular lever 72 rotates in the reverse direction, and the positioning lever 78 moves from the release position to the positioning position to position the reversing unit 1.
(4-6) At the same time, the slide shaft 65 moves forward, the clamping claws 41 to 44 open, and the tray T is released.
(4-7) The sensor 39 detects the detection piece 38.
(5) Based on the detection signal, the control device stops the motor of the reversing means, and thereby the rotation of the input shaft 33 of the index unit 32 is stopped.
(6) At the same time, the control device operates the chain conveyor 8 and the other two chain conveyors described above. That is, returning to (1), the above operation is repeated.

The reversing device shown in FIG. 7 is a reversing device that is mainly used as an unloader when taking out the retort pouch from the tray in an aligned state.
Although FIG. 7 shows only a main part and many parts are not shown, this inversion device has all the configurations of the inversion devices shown in FIGS. What is added to the reversing unit 1 is a pair of belt conveyors 81, 81, both of which are installed on the carry-in position of the reversing unit 1. Two guide blocks 83 are fixed to the side surface of the frame 82 of the belt conveyor 81 so as to be separated in the front-rear direction, and a guide shaft 84 erected on the reverse frame 6 is slidably inserted into a hole formed in the guide block 83. Yes. The distal end of the guide shaft 84 is connected by a connection plate 85, and a compression spring 86 is interposed between the connection plate 85 and the guide block 83, and urges the belt conveyor 81 inward. Reference numeral 87 denotes a stopper, which is fixed to the reversal frame 6 so as to be adjustable in position, and abuts against the guide block 83 to define the lower end position (position closest to the innermost side) of the belt conveyor 81.

A bearing member 88 is fixed to the front and rear of the reversal frame 6, and a fulcrum shaft 91 fixed to the center of a dog-shaped lever 89 is supported on the bearing member, and one end of the lever 89 is a guide block via a link 92. The roller 93 is attached to the other end. Further, a pressing lever 94 is disposed so as to face the roller 93. The pressing lever 94 is fixed to a fulcrum shaft 95 that rotates within a predetermined angle range in the non-inversion portion, and a pressing portion 96 that presses the roller 93 is formed at the tip thereof.
7 has the same structure, and the guide block 83 to the pressing lever 94 are arranged in the same form. The belt conveyor 81 includes the frame 82, a pair of pulleys 97 disposed before and after the frame 82, and a conveyor belt 98 spanned around the pulleys. The conveyor belt 98 has a size that covers almost the entire surface of all the retort pouches placed on the tray T, and an elastic member (not shown) is attached to the surface thereof. The driving source of the belt conveyor 81 is a driving roller 99 which is disposed in the non-reversing portion and is movable in the direction of the arrow. The driving roller 99 contacts the pulley 97 of the belt conveyor 81 from the outer surface of the conveyor belt 98. Then, the driving force is transmitted to the belt conveyor 81.

In this reversing device, the belt conveyor 81 serves to discharge the retort pouch placed on the tray, and the upper surface of the retort pouch so that the retort pouch in the tray T does not move or drop when the reversing unit 1 is reversed. It has the role of touching and holding this. At this time, the elastic member attached to the surface of the conveyor belt 98 prevents the retort pouch from being damaged.
The operation of the reversing device is basically the same as that of the previous reversing device, except that the belt conveyor 81 is moved up and down by the pressing lever 94 and the belt roller 81 is driven and driven by the driving roller 99 simultaneously. There is no.
The start of the operation of the pressing lever 94 is, for example, when the reversing unit 1 is reversed and becomes horizontal, and the positioning lever 78 positions the reversing unit 1 in terms of timing. When the pressing lever 94 presses the roller 93, the lever 89 rotates, and both the belt conveyors 81 that have been biased inward by the biasing force of the compression spring 86 move outward. At this time, the belt conveyor 81 descends with the retort pouch placed in an aligned state on the lower side of the reversing unit 1, and the drive roller 99 rises and contacts the belt conveyor 81 (see the imaginary line). The belt conveyor 81 is driven, and the retort pouch is carried out of the reversing unit 1. In addition, it is necessary to arrange | position the belt conveyor which receives a retort pouch from the belt conveyor 81 in the alignment state outside the inversion part 1. FIG. On the other hand, on the upper side of the reversing section, the tray T (retort pouch discharged) is carried out by the belt conveyor 8, and the tray T (retort pouch not discharged) is newly carried into the carry-in position.
Subsequently, when the driving roller 99 is lowered and the pressing lever 94 swings in the opposite direction to release the roller 93, the belt conveyor 81 is moved inward by the urging force of the compression spring 86, and the upper belt conveyor 81 is moved. Presses the retort pouch in the tray T at the loading position. The start of this operation is, for example, when the motor of the reversing means is started in terms of timing.

1 is an overall plan view of a reversing device according to the present invention. FIG. It is AA front sectional drawing of FIG. It is a front view (partial cross section) mainly showing the structure of a tray holding means (clamping claw) transmission mechanism and a tray detection means. It is BB front sectional drawing of FIG. It is side surface sectional drawing which shows the structure of an inversion part. It is a principal part front view of another inversion apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reverse part 5 Reverse shaft 8 Chain conveyor 11,12 Feed shaft 14 Feed chain 22 Tray detection piece 23 Detection dog 29 Sensor 32 Index unit 33 Input shaft 35 Output shaft 38 Detection piece 39 Sensor 41-44 Clamping claws 45-48 Opening / closing shaft 61 connecting shaft 63 through hole 65 slide shaft 66 groove cam 67 cam lever 73 air cylinder 78 positioning lever 79 tray stopper 81 belt conveyor 94 pressing lever 98 conveyor belt 99 driving roller

Claims (9)

Reversing the tray loaded in the reversing part in the upward horizontal state together with the reversing part, discharging the retort pouch in the tray, and then reversing the empty tray again with the reversing part In the apparatus, the reversing unit has a reversing axis at its center and is rotatable around the reversing axis, and the tray loading position is set on both sides across the reversing axis, and the reversing unit is moved at a time. A reversing means that rotates 180 degrees each; a tray carrying means that carries the tray into and out of the reversing unit into the carrying-in position, and has the same carrying direction at the time of carrying in and out; and the reversing Each having a holding claw installed in the front-rear position when viewed from the conveyance direction, and holding the tray at each loading position from the front and rear by the holding claw. And a tray holding means. The reversing means further comprises a motor as a drive source and an index unit for inputting rotation of the motor, and an output shaft of the index unit is connected to the reversing shaft, and the tray holding means is provided. The means includes a cam for opening / closing a clamping claw that is connected to the motor and rotates, and the cam is connected to the clamping claw through a transmission mechanism. In the tray holding means, all of the clamping claws are opened and closed simultaneously with the rotation of the cam, and the opening and closing of the clamping claws with the rotation of the cam is closed before the reversing part is reversed to hold the tray. A tray reversing device, wherein the tray reversing device is timed to open and release the tray after reversing. The transmission mechanism of the tray holding means includes a downstream transmission mechanism that is installed in the reversing unit and rotates with the reversing unit, and an upstream transmission mechanism that is installed in the non-reversing unit. A slide shaft that is concentric with the reversing shaft and rotates with the reversing shaft within the reversing shaft, and is configured to move forward and backward in the axial direction of the reversing shaft, and transmits the power of the cam; The tray reversing device according to claim 1 or 2, wherein the side transmission mechanism is connected to the side transmission mechanism through a joint member so as to be relatively rotatable. The upstream transmission mechanism includes an overload absorbing member, transmits power to the downstream transmission mechanism via the overload absorbing member, and when the overload absorbing member is overloaded to the downstream transmission mechanism, 4. The tray reversing device according to claim 3, wherein movement of the upstream transmission mechanism is prevented from being transmitted to the downstream transmission mechanism. A tray detection piece installed in the reversing part so as to be movable between a detection position and a non-detection position; and a biasing means for constantly urging the tray detection piece toward the non-detection position; Is moved from the non-detection position to the detection position by being pushed by the tray carried into the reversing unit, and a sensor for detecting that the tray detection piece has moved to the detection position is installed in the non-reversing unit. 5. The tray reversing device according to claim 1, further comprising a control device that stops transport of the tray transport unit based on a detection signal of the sensor when the paper is carried in. The tray conveying means is a conveyor installed in the reversing unit, and the driving force of a motor installed in the non-reversing unit is transmitted to the conveyor via a transmission mechanism, and the conveying direction is the axial direction of the reversing shaft The tray reversing device according to claim 1, wherein the tray reversing device is perpendicular to the tray. A part of the structure of the reversing unit at a position where the both ends of the tray of the reversing unit are slightly higher than the upper end of the tray carried into the carrying-in position and covers both edges of the tray along the tray conveying direction. 7. A tray reversing device according to any one of claims 1 to 6, wherein a tray stopper is installed to prevent the tray that has been reversed and turned downward from falling. A belt conveyor for discharging a retort pouch placed on a tray is disposed as a part of the structure of the reversing unit on both carrying positions of the reversing unit, and the belt conveyor has the conveyor belt at the loading position. The retort pouch mounted on the tray has a size that covers almost the entire surface, is movable in the direction perpendicular to the surface of the tray, and the conveyor belt is attached to the tray when moved to the tray side. The tray according to any one of claims 1 to 7, wherein the tray is in contact with and presses the placed retort pouch and prevents the retort pouch from falling during the reversing of the reversing part. Reversing device. Reversing the tray loaded in the reversing unit in an upwardly horizontal state together with the reversing unit, discharging the retort pouch in the tray, and then reversing the empty tray again with the reversing unit In the apparatus, tray conveying means for carrying the tray into and out of the reversing unit, a tray detection piece installed on the reversing unit movably between a detection position and a non-detection position, There is provided a biasing means for constantly biasing the tray detection piece toward the non-detection position, and the tray detection piece is pushed by the tray carried into the reversing unit and moves from the non-detection position to the detection position. In addition, a sensor for detecting that the tray detection piece has moved to the detection position is installed in the non-inversion portion, and the transport of the tray transport means is stopped based on the detection signal of the sensor when the tray is loaded. Reversing device of the tray, characterized in that it comprises a control device that.

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