JPH06126580A - Connecting rod holding mechanism in connecting rod carrier - Google Patents

Abstract

PURPOSE:To check the lateral oscillation of the lower end of a connecting rod by providing a regulating mechanism to regulate the dimension of clearance between a pair of holding bars for checking the lateral oscillation of the lower end of the connecting rod when the lower end of the connecting rod takes its position. CONSTITUTION:In the case where the kind of a rod part to be carried is changed, and the dimension of a clearance between holding bars 27, 27 is therefore changed, the telescopic rod 29a of a pneumatic cylinder 29 is contracted to move back a driving rack. Next after a rotary body 37 is rotated by a rotary motor 39 to oppositely position fixed stoppers 38 on the extension of the tip 30a of the driving rack 30, the pneumatic cylinder 29 is driven to extend the telescopic rod 29a. The tip 30a of the driving rack 30 is then abutted against the stopper 38 to move the driving rack 30 to a fixed position. Thus the quantity of rotation of a driving shaft 32 is thereby decided, and bosses 36, 36 threadedly engaged with a female thread part 32a formed in mutually inverse thread form are moved to regulate a space between a pair of holding bars 27, 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting rod holding mechanism in a connecting rod conveying device for conveying a rod portion and a cap portion of a connecting rod in a connecting rod processing line.

[0002]

2. Description of the Related Art As is well known, a connecting rod, which is a main component of an engine, comprises a rod portion 1 and a cap portion 2 as shown in FIG. 5, and a crankshaft is arranged between them. The two are tightened. In this connecting rod, the rod portion 1 and the cap portion 2 are separately manufactured, and thereafter, they are sent in the parallel running state by the same carrying device, and then sent to the connecting rod processing machine through the carrying device.

Conventionally, as a conveying device for the work 4 consisting of the rod portion 1 and the cap portion 2, the following constitution is generally used. That is, as shown in FIG. 6, a plurality of transfer stands 7, 7, ... Are provided side by side on the machine frame 5 so as to form a plurality of workpiece transfer paths 6, 6 ,. Transport bars 8, 8 for transporting the work 4 are disposed in the work transport paths 6, 6, ... Between the 7, 7 ,. A drive shaft 9 having an eccentric shaft portion 9a whose cross-sectional shape is eccentric is disposed below the transport tables 7, 7, ..., and the drive shaft 9 is rotationally driven by a drive source (not shown). Has been done.

Between each conveyor bar 8 and the eccentric shaft portion 9a of the drive shaft 9, when the drive shaft 9 rotates, the conveyor bar 8 is intermittently moved according to the eccentric movement of the eccentric shaft portion 9a. The transmission member 10 for performing the feeding operation is inserted. With this configuration, the work 4 is so-called walking-carried on the carriages 7, 7, ....

In this apparatus, in order to prevent the rod portion 1 from swinging in the direction orthogonal to the conveying direction and coming off the work conveying passage 6 and being caught or dropped, during the conveyance of the rod portion 1. Holding guide with concave section 1
1 is provided below the work transfer passage 6 along the extending direction of the work transfer passage 6, and the lower end of the rod portion 1 is laterally held by this holding guide 11.

[0006]

However, in the conventional holding guide 11 as described above, when there are a plurality of types of connecting rods to be transported, the size of the rod portion 1 is different for each type of connecting rod, and therefore the transporting is performed. Each time the type of connecting rod to be used changes, it is necessary to replace the holding guide 11 with a suitable size. For this reason, many types of holding guides 11 are required, which leads to an increase in equipment costs, and it takes time to replace the holding guides 11, which causes a problem of lowering work efficiency. The present invention has been made in view of the above points, and an object of the present invention is to provide a connecting rod holding mechanism of a connecting rod conveying device that can reduce the cost and improve the working efficiency.

[0007]

The invention according to claim 1 is
Holds a carrier table that is arranged in parallel with each other so as to form a work transfer path on the machine frame, a transfer mechanism that intermittently transfers a work, and a lower end of a connecting rod that is fed through the work transfer path. In a connecting rod transporting device including a holding mechanism, the holding mechanisms are disposed below the work transporting path so as to face each other with a certain distance therebetween, and when the lower end portion of the connecting rod is located, It is characterized by comprising a pair of holding bars that prevent the lower end portion from swinging laterally, and an adjusting mechanism that adjusts the distance between the holding bars.

According to a second aspect of the present invention, in the connecting rod holding mechanism in the connecting rod transporting apparatus according to the first aspect, the adjusting mechanism is disposed so as to penetrate the holding bar, and is provided on the outer peripheral surface near the holding bar. It is characterized by comprising a drive shaft having male screw portions formed in mutually opposite screw types, a female screw member screwed to the drive shaft and fixed to the holding bar, and a drive mechanism for rotationally driving the drive shaft. I am trying.

[0009]

According to the first aspect of the invention, when the work is conveyed in the work conveying passage, the adjusting mechanism provided in the holding mechanism causes the adjusting mechanism to be arranged so as to face each other at a certain distance depending on various sizes of the connecting rods. By adjusting the distance between the holding bars, the lower end of the connecting rod is held from both sides to prevent the lower end of the connecting rod from swinging laterally.

According to the second aspect of the present invention, the drive mechanism rotationally drives the drive shaft having the male screw portions formed on the outer peripheral surface in the reverse screw form. Then, the female screw member screwed to the drive shaft moves on the drive shaft, and accordingly, the pair of holding bars approaches or separates from each other, and the distance between the holding bars is adjusted.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. In these figures, parts common to those of FIGS. 5 and 6 shown as a conventional example are denoted by the same reference numerals. FIG. 2 shows a connecting rod holding mechanism 50 in the connecting rod transfer device 12 according to the present invention. Reference numeral 5 is a machine frame installed on the floor. .. are arranged in parallel with each other so as to form the passages 6, 6 ,.

The work transfer passages 6a, 6a are formed by the rod portion 1.
And a shoulder portion 1 of the rod portion 1, respectively.
a and 1a are configured to be locked to the carrier tables 7 and 7 on both sides. On the other hand, the work transfer paths 6b and 6b are paths for transferring the cap portion 2, and each of the cap portion 2
Both end portions 2a, 2a are configured to be placed on the carrier tables 7, 7 on both sides.

The connecting rod transfer device 12 is provided with a transfer mechanism 13 having the following structure for transferring the rod part 1 and the cap part 2. A drive shaft 14 is arranged below the transport tables 7, 7, .... This drive shaft 14
Are arranged at predetermined intervals in the lengthwise direction of the carriages 7, 7, .... The drive shaft 14 includes bearings 16 and 16 fixed to both sides of a fixed rail portion 15 formed in the middle stage of the machine frame 5.
It is rotatably supported. In this drive shaft 14, the lower part of each work transfer passage 6, 6, ...
The eccentric shaft portion 14b is eccentric with respect to the axes of a and 14a.

On the other hand, a pair of transfer bars 17, 17 are provided in the work transfer paths 6a, 6a for transferring the rod portion 1, respectively.
Are arranged so as to extend in the direction in which the work transfer paths 6a, 6a extend. An annular body 19 is disposed on the eccentric shaft portion 14b below each of the transport bars 17 via a bearing 18. Below the transport bar 17, a lower wall portion 20 is provided.
A transmission member 20 including a and a protruding wall portion 20b is formed. Connection wall portion 19a formed at the upper end of the annular body 19
And the protruding wall portion 20b formed at the lower end of the transmission member 20 are rotatably connected to each other by a pin (not shown).

On the other hand, in the work transfer paths 6b, 6b for transferring the cap portion 2, the transfer bars 21, 21 are arranged in the extending direction of the work transfer paths 6b, 6b. A transmission member 22 is formed at the lower end of each of the transport bars 21 so as to extend downward, and the lower end of the transmission member 22 and the eccentric shaft portion 14b corresponding to the lower end of the transmission member 22 are annularly arranged via a bearing 23. The body 24 is rotatably connected to each other by a pin (not shown).

A drive motor (not shown) is provided below the machine casing 5, and the drive motor (not shown) is provided.
Sprocket and drive shaft 14 fixed to one end of the rotary shaft of
The sprocket 25 fixed to one end of the chain
6 is wound and the drive shaft 14 is rotated by this drive motor (not shown). The connecting rod transfer device 12 rotates the drive shaft 14 with a drive motor (not shown) by the transfer mechanism 13 configured as described above, and intermittently feeds the work with the transfer bars 17, 17 and 21, 21. , A device for carrying the work 4 by so-called walking.

Holding bars 27, 27 for preventing the lower end portion of the rod portion 1 from laterally swinging are opposed to the inside of the transmission member 20 below each work transfer passage 6a of the rod portion 1. Are arranged. The holding bars 27, 27 are provided with an inclined surface 2 at the upper end of a strip-shaped plate extending in the transport direction of the rod portion 1.
7a and 27a are formed, and each inclined surface 27
In a state in which a and 27a are opposed to each other, they are arranged in parallel at a predetermined interval.

As shown in FIG. 1, the connecting rod transporting device 12 is provided with an adjusting mechanism 28 having the following structure for adjusting the holding interval between the holding bars 27, 27 according to the type of connecting rod to be transported. It is said to have a different structure. That is, as shown in FIG. 3, on the side of the machine casing 5,
A pneumatic cylinder 29 is provided, and a drive rack 30 having a rack formed on the upper surface is provided on both sides of the telescopic rod 29a of the pneumatic cylinder 29.

On the other hand, below the holding bars 27, 27, a drive shaft 32 is rotatably arranged by bearings 33, 33 in a direction orthogonal to the conveying direction. In the connecting rod carrying device 12 of the present embodiment, as shown in FIG. 1, a plurality of drive shafts 32 having the same structure are provided at predetermined intervals.
Further, a guide shaft 34 is arranged side by side on the drive shaft 32. As shown in FIG. 3, the drive shaft 32
A pinion 35 is fixed to one end of the pinion 35, and the pinion 35 is engaged with the drive rack 30.

Under the work transfer passages 6a, 6a of the rod portion 1, male screw portions 32a having reverse threads are formed on the outer peripheral surfaces of both sides of the drive shaft 32 in the lower portion of the work transfer passages 6a, 6a. , 32a are formed. Bosses (female screw members) 36, 36 on which female screws are formed, are screwed onto these male screw portions 32a, 32a. Each boss 36 is fixed to the holding bar 27. This configuration
The drive shaft 32 in the lower portion of each work transfer passage 6a for transferring the rod portion 1 has the same configuration.

On the other hand, on the tip 30a side of the drive rack 30, a disc-shaped rotating body 37 is rotatably arranged in a direction orthogonal to the extending direction of the drive rack 30.
As shown in FIG. 4, the rotating body 37 is provided in the drive rack 30.
Stoppers 38, 38, ... Having a plurality of types of lengths extending in the extending direction are detachably fixed. As shown in FIG. 3, the rotating body 37 is rotatable by a rotation motor 39 with a speed reducer provided behind it. In the drive mechanism 40 including the pneumatic cylinder 29, the drive rack 30, and the pinion 35, each stopper 38 selectively faces the tip 30a of the drive rack 30 when the rotating body 37 rotates. The drive shaft 32 is rotated to a predetermined rotation position,
The holding bars 27, 27 facing each other are separated from each other by a predetermined distance.

Next, the operation of the holding mechanism 50 composed of the holding bar 27 and the adjusting mechanism 28 will be described with reference to FIGS. 1 to 4. The protrusion position of the drive rack 30 is determined by the stopper 38 of the rotating body 37, the pneumatic cylinder 29 is driven, and the telescopic rod 29a is extended.
The drive rack 30 is moved to a predetermined position so that the drive shaft 32
By setting the rotation position of the holding bar 27, 27
Set the separation dimension of. In this case, the drive rack 30 and the stopper 38 of the rotating body 37 correspond to each other to set the distance between the holding bars 27, 27. The holding bars 27, 27 set in this way hold the sideways swing of the lower end portion 1b of the rod portion 1 that is walking conveyed.

Next, when the type of the rod portion 1 to be conveyed is changed and the distance between the holding bars 27, 27 is changed, the telescopic rod 29a of the pneumatic cylinder 29 is contracted to retract the drive rack 30. Then, the rotation motor 39
The rotating body 37 is rotated by the predetermined stopper 38
Are opposed to each other on the extension of the tip 30a of the drive rack 30, and then the pneumatic cylinder 29 is driven in the same manner as described above to extend the telescopic rod 29a. Then, the tip 30a of the drive rack 30 is brought into contact with the stopper 38 to move the drive rack 30 to a predetermined position. Then, the amount of rotation of the drive shaft 32 is determined by the amount of movement of the drive rack 30,
As a result, the bosses 36, 36 screwed into the male screw portions 32a, 32a formed on the drive shaft 32 in the reverse screw form move, and the pair of holding bars 27, 27 approach or separate to form a predetermined interval. .

As described above, in the connecting rod holding mechanism 50 of the connecting rod transporting device 12, the adjusting mechanism 28 allows the connecting rods 1 of various sizes to be used.
According to the size of the rod portion 1, the distance between the opposing holding bars 27, 27 is adjusted, the lower end portion 1a of the rod portion 1 of the connecting rod is held from both sides, and the lower end portion 1a of the rod portion 1 is adjusted. It is possible to prevent the swinging of the. As a result, it is not necessary to prepare a holding guide for each size of the rod portion 1 of the connecting rod to be transported, and the equipment cost can be significantly reduced.

Further, the pneumatic cylinder 29 and the drive rack 3
A male screw part 3 formed on the outer peripheral surface in reverse thread form by a drive mechanism 40 composed of 0 and a pinion 35.
The drive shaft 32 having the 2a can be rotationally driven, and the separation dimension of the pair of holding bars 27, 27 can be set close to or apart from each other and automatically set to a predetermined dimension. As a result, when changing the size of the rod portion 1 of the connecting rod to be transported, the time required for so-called setup change can be significantly shortened, and the work efficiency can be improved.

Further, in order to set the separation dimension of the holding bars 27, 27, a plurality of kinds of stoppers 3 are attached to the rotating body 37.
.., and the drive rack 30 is brought into contact with the stopper 38 to set the rotation position of the drive shaft 32. Accordingly, it is possible to set a plurality of separation sizes between the holding bars 27, 27 in advance, and it is possible to accurately reproduce the set size between the holding bars 27, 27.

In this embodiment, as described above, the stopper 38 provided on the rotating body 37 is used to set the distance between the holding bars 27, 27. However, the present invention is not limited to this. As long as it can be set to a predetermined size, the structure may be such that the rotational position of the drive shaft 32 is set by sequencer control or the like.

[0028]

As described above, according to the holding mechanism for connecting rods according to the first aspect, the adjusting mechanism allows holding rods arranged facing each other according to connecting rod sizes, even for connecting rods of various sizes. It is possible to adjust the distance between the bars and hold the lower end of the connecting rod from both sides to prevent the connecting rod from swinging laterally.
As a result, it is not necessary to prepare a holding guide for each size of connecting rod to be transported, and the equipment cost can be significantly reduced.

According to the connecting rod holding mechanism of the second aspect, the drive mechanism causes the drive mechanism to rotate the drive shaft having the male screw portions formed on the outer peripheral surface in the reverse thread form, and the female screw member screwed to the drive shaft. By moving on the drive shaft, the separation dimension of the pair of holding bars can be set close to or apart from each other and automatically set to a predetermined dimension.
As a result, when changing the size of the connecting rod to be transported, the time required for so-called setup change can be significantly reduced, and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing an example of a connecting rod holding mechanism in a connecting rod conveying device according to the present invention.

FIG. 2 is a side view showing a connecting rod holding mechanism in the connecting rod transfer device according to the present invention.

FIG. 3 is a plan view showing a part of a connecting rod holding mechanism in the connecting rod carrier according to the present invention.

FIG. 4 is a perspective view showing a rotating body and a stopper according to this embodiment.

FIG. 5 is a perspective view showing a connecting rod.

FIG. 6 is a side sectional view showing a connecting rod holding mechanism in a conventional connecting rod conveying device.

[Explanation of symbols]

 5 Machine frame 6 Work transfer path 7 Transfer table 12 Connecting rod transfer device 13 Transfer mechanism 27 Holding bar 28 Adjusting mechanism 32 Drive shaft 36 Boss (female screw member) 40 Drive mechanism 50 Holding mechanism

Claims (2)

[Claims] 1. A transfer table, which is arranged side by side and spaced apart from each other so as to form a work transfer path on a machine frame, a transfer mechanism which intermittently transfers a work, and a connecting rod which is supplied through the work transfer path. In a connecting rod transporting device comprising a holding mechanism for holding a lower end portion, the holding mechanisms are arranged below the work transporting passage so as to be spaced apart from each other by a predetermined distance, and the lower end portion of the connecting rod is located. Further, a connecting rod holding mechanism in a connecting rod transporting device, comprising a pair of holding bars for preventing the lower end portion of the connecting rod from swinging laterally, and an adjusting mechanism for adjusting a distance between the holding bars. . 2. The connecting rod holding mechanism in the connecting rod transporting device according to claim 1, wherein the adjusting mechanism comprises:
A drive shaft, which is disposed so as to penetrate through the holding bar and has male threads formed on the outer peripheral surface in the vicinity of the holding bar in mutually reverse threaded manner, and is screwed to the drive shaft and fixed to the holding bar. A holding mechanism for a connecting rod in a connecting rod transporting device, comprising a female screw member and a driving mechanism for rotationally driving a driving shaft.