JP3173309B2 - Transfer machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates also relates <br/> the transfer machine, and more particularly to a transfer machine installed independently conveying device for conveying the workpieces between each machine tool.

[0002]

2. Description of the Related Art Conventionally, there is a transfer machine shown in FIG. 8 as a transfer machine for processing a workpiece by dividing a process by a plurality of machine tools. S1 to S3 are processing stations including machine tools, 17 is a conveyor, 10 is a transport device, and each of the processing stations S1 to S3 is disposed with a constant laying pitch P. The transfer device 10 is a lift-and-carry type transfer device. A transfer bar 11 provided with jigs 16 for mounting and holding a workpiece W at a constant pitch P moves in a reciprocating direction with respect to a transport direction of the workpiece W. The workpiece W can be moved in the elevating direction, and the workpiece W is conveyed by a combination of the forward / backward and elevating / moving operations.

The transfer bar 11 is movable on rollers rotatably supported by one ends of a plurality of swing arms 15. The bending portion of the swing arm 15 is rotatably supported on a reference plane (not shown), the roller is rotatably supported at one end, and the other end is swingably supported by the lift bar 14. I have. When the swing arm 15a is rotated by the lift device 13 composed of a motor, all the swing arms 15 swing in synchronization, and the transfer bar 11 is moved up and down. Further, the transfer bar 11 is connected to the shift device 12, and the transfer bar 11 is moved forward and backward by driving the shift device 12. The shift device 12 includes a link mechanism and a cylinder (not shown), and moves the transfer bar 11 forward and backward regardless of the elevation of the transfer bar 11.

[0004]

SUMMARY OF THE INVENTION
The transfer device that transfers the workpiece W using the transfer bar 11 as described above has the following problems. That is, all the processing stations S1 to S3 must be arranged at the same pitch P in accordance with the processing station having the longest transport pitch, and the arrangement of the processing stations S1 to S3 has a small degree of freedom and flexibility. bad. Also, the transfer bar 11
Is fixed to a predetermined length in accordance with the number of processing stations S1 to S3. Therefore, when the number of processing stations is changed, the transfer bar 11 must be replaced with another having a different length. In addition, there is a problem that the flexibility at the time of rearranging the machine tools and organizing the process of the processing station is very poor.

Accordingly, an object of the present invention is to provide a transfer machine which has a high degree of freedom in arranging a processing station and has good flexibility in organizing the steps of the processing station in order to solve the above-mentioned problems.

[0006]

According to a first aspect of the present invention, there is provided a transfer machine for processing a workpiece by dividing a process by a plurality of machine tools. Is provided independently between each of the
A temporary cradle on which a workpiece that has been processed by the machine tool in the preceding process is placed at the center between the machining position of the machine tool in the preceding process and the machining position of the machine tool in the subsequent process, and arranged at a different laying pitch
Provided independently between each of the plurality of machine tools including the machine tool, a frame provided in the middle of the machine tool, and guided on the frame so as to be able to move forward and backward in the workpiece conveying direction. a slide member having a substantially half length of the distance between the respective working position, a first transport head for supporting the workpiece is provided at the front end of the slide member,
A transfer device provided at a rear end of the slide member and having a second transfer head for supporting the work piece, a transfer of the work piece between a processing position of the machine tool and the transfer device, A workpiece transfer device for transferring a workpiece between transfer devices, wherein each of the transfer devices sets a state in which the slide member is located substantially at the center of the transfer device as an original position, and completes processing from the machine tool. The first transport head is moved below the processing position of the machine tool in the preceding process by moving the slide member from the original position in the direction opposite to the workpiece transport direction by a signal, and at the same time, the second transport head Is positioned below the temporary receiving table, and the workpiece transfer device places the workpiece at the processing position of the machine tool in the preceding process on the first transport head and simultaneously places the workpiece on the temporary receiving table. The first transfer head is positioned above the temporary receiving table by placing the workpiece on the second transfer head, and then moving the slide member in the work transfer direction. Is positioned above the machine tool in the post-process, and the workpiece placed on the first transport head is delivered to the temporary receiving table by the workpiece delivery device, and is placed on the second transport head at the same time. and it delivers the workpiece to the machining position of the machine tool of the rear step, the conveyed further consisting operation of returning to the original position by moving in the opposite direction to the workpiece conveying direction said slide member
Cycle and the difference in the distance between the machining positions
Regardless of the cycle time of the transfer cycle,
It is characterized in that the transport is controlled so that

[0007] The configuration of the invention according to claim 2 is the same as the above-mentioned claim.
Item 1. The transfer machine according to Item 1, wherein the lifting device
Wherein the workpiece transfer device is provided in the transfer device.
Consists of According to the third aspect of the present invention,
1. The transfer machine according to claim 1,
Transfer device at the processing position of the machine tool and at the temporary cradle.
Consists of

[0008]

According to the transfer machine of the present invention, the
Independently arranged transfer devices between each operate as follows
I do. The slide member is located approximately at the center of the transfer device
With the state as the original position, first, the slide member
It is in. Then, the processing is completed by the machining completion signal from the machine tool.
When it is determined that the work has been completed, the slide
Move the material in the opposite direction to the workpiece transfer direction and perform the first transfer
Position the head below the machining position of the previous machine tool
At the same time, the second transport head is positioned below the temporary receiving table.
Place.

Next, the work of the preceding process is performed by the work delivery device.
Place the workpiece at the processing position of the machine on the first transport head
At the same time, the workpiece on the temporary support
Place. Workpiece is placed on each transport head
Then, the slide member is moved in the workpiece transfer direction, and the first transfer is performed.
The second transport is performed at the same time as the transport head is positioned above the temporary receiving table.
The head is positioned above a post-process machine tool.

Next, the workpiece placed on the first transport head is delivered to the temporary receiving table by the workpiece delivery device, and at the same time, the workpiece is transferred to the second receiving head.
The workpiece placed on the transport head is transferred to the processing position of the machine tool in the subsequent process, and the slide member is moved in the direction opposite to the workpiece transport direction to return to the original position. The above operation is repeated every time the machining by the machine tool is completed, so that all the transfer devices have the same size regardless of the distance between the machining positions.
By carrying out the transfer operations all at once in a time cycle, the transfer of the workpiece as the entire transfer machine is performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the system arrangement of the transfer machine of the present embodiment. The transfer machine of the present embodiment
Mainly processing stations S1 to S4, transfer devices 100A to
100D, the temporary receiving stands 300A to 300D, and the system control device 500.

The processing stations S1 to S3 are made of the same machine tool and are arranged at the laying pitch P1. The processing stations S4 are processing stations S1 to S
Reference numeral 3 denotes a processing station comprising different types of machine tools, which are arranged at a laying pitch P2 different from the laying pitch P1. Each of the processing stations S1 to S4 is provided with a work table 350A to 350D, respectively, so that a workpiece W conveyed by conveyance devices 100A to 100D described later is supported at a processing position via a jig unit (not shown). Has become.

A pair of transfer devices 100A to 100D and a temporary receiving table 300A are provided between each of the processing stations S1 to S4.
To 300D are provided independently of each other, and are disposed at the center between the processing position of the processing station of the preceding process and the processing position of the processing station of the subsequent process according to the laying pitch of the processing stations S1 to S4. I have. For example, the transfer device 100B and the temporary receiving table 300B are disposed at the center (laying pitch P1 / 2) of the processing station S1 and the processing station S2, and the transfer device 100D and the temporary receiving table 300D are processed at the processing station S3 and the processing station S4. Center (laying pitch P2 / 2)
It is arranged in. However, the transfer device 100A and the temporary receiving table 300A are arranged at the center between the loading station LS for supplying the workpiece W and the processing station S1. In addition, the pair of transfer devices 100A to 100A
Positional relationship 0D and the temporary cradle 3 0 0A~3 0 0D, as shown the side view in FIG. 6, the workpiece conveying direction temporary cradle 300 which is divided into (a direction perpendicular to the plane of FIG. 6) Are arranged so as to cover the transporting devices 100A to 100D from above. In the present embodiment, each of the transfer devices 100A to 100A
The 100D and the temporary receiving tables 300A to 300D are disposed on a chip discharge device 400 that discharges cutting chips from a processing station in a later process to the rear of the processing station. Each of the transfer devices 100A to 100E and the temporary receiving table 3
The configuration in which 00A to 300D and the chip ejection device 400 are arranged at the same position in the transport direction is effective in shortening the overall length of the system and reducing the required floor area.

The transfer devices 100A to 100D carry out the workpiece W from the processing station or the loading station LS in the preceding process to the temporary receiving table and transfer the workpiece W placed on the temporary receiving table to the processing station in the subsequent process. It is a transport device to be carried in. For example, with respect to the transfer device 100B, the workpiece W in the processing station S1 is unloaded to the temporary receiving table 300B, and the workpiece W placed on the temporary receiving table 300B.
Is carried into the processing station S2. The transport operation of each of the transport devices 100A to 100D is controlled collectively by the system control device 500.

Next, the transfer devices 100A to 100A of this embodiment
0D will be described in detail with reference to FIGS. Each of the transfer devices 100A to 100D has a transfer pitch P1,
Although P2 is different, since it has the same configuration, only the transfer device 100A will be described. Transfer device 100A
As shown in FIG. 2, a fixed base 101 fixedly installed on a floor surface or an appropriate mounting base, a frame 121 that can be moved up and down with respect to the fixed base 101 by an elevating device 110, sliding device 12 which is slidably guided for 1 the workpiece conveying direction
It is mainly composed of 0.

The elevating device 110 moves a pair of link devices 112, which are swingably supported by pins at midpoints of each other, in a horizontal direction (a direction perpendicular to the plane of FIG. 2) perpendicular to the workpiece conveying direction. into two groups provided vertically moving the frame 12 1 the link device 112 is erected swung by a cylinder 111. In this embodiment, the lifting device 110 constitutes a workpiece delivery device in the scope of the claims.

As shown in FIG.
Is a length that is slidably guided by the frame 121 and is approximately half the length of the workpiece transport distance (for transport devices 100A to 100C, it is a length obtained by adding the width of the workpiece W to approximately half P1 / 2 of the laying pitch P1). The transfer device 100D has a length obtained by adding the width of the workpiece W to approximately half P2 / 2 of the laying pitch P2).
22 and a long window 127 opened in the longitudinal direction at the upper and lower middle portions of the slide member 122, and the slide member 1
The slide plate 124 integrally connects the slide plates 22 to each other. Linear rails 125 are respectively fixed to both end surfaces in the left-right direction orthogonal to the transport direction of the slide plate 124, and each of the linear rails 125 is fixed to the frame 121 at two places before and after the central part in the transport direction. Guided by a linear bearing unit 126. Further, a pair of rollers 160 for guiding the straight rails 125 up and down is provided at each of the front and rear ends of the frame 121.

Slide member 1 arranged on the left side in FIG.
A rack 123 is formed on the lower surface of the 22 over substantially the entire length thereof. The rack 123 is a slide member 122
Alternatively, it may be formed as a separate component and fixed to the lower surface of the slide plate 563. The rack 123 is meshed with a large-diameter gear 141 that is rotationally driven by a servomotor 140 with a built-in reduction mechanism attached to the center of the frame 121, and the sliding member 122 is moved by the servomotor 140.
1 is moved forward and backward in the transport direction.

At the front and rear ends of the slide member 122, a first transfer head 150a and a second transfer head 150b for simultaneously mounting two workpieces W are fixed, respectively, and are integrated with the slide member 122. It is designed to move. The distance between the first transport head 150a and the second transport head 150b is the transport distance (laying pitch P1)
Half of P1 / 2. However, the transfer device 100
As for D, the interval between the first transport head 150a and the second transport head 150b is P2 / 2.

Next, the temporary receiving stands 300A to 300A of this embodiment
D will be described with reference to FIGS. Note that the temporary receiving stands 300A to 300D have the same configuration,
Only 0A will be described. As shown in a front view in FIG. 4 and a side view in FIG.
00a, the first and second transfer heads 150a and 150b of the transfer device 100A and the slide member 1
Also, the transport device 100A is configured to cover the transport device 100A from both sides with an interval that does not interfere even when the transport device 22 is lifted by the lifting device 110. The mounting member 300a is composed of a pair of support columns 302 and a mounting plate 301, and the mounting plate 3 is mounted on the support column 302 fixedly installed on a floor surface or an appropriate mounting base.
01 is fixed horizontally. The height of the mounting member 300a is determined by the upper end surfaces of the transfer heads 150a and 150b when the elevating device 110 of the transfer device 100A is lifted (specifically, the positioning provided on the upper end surfaces of the transfer heads 150a and 150b, not shown). Upper limit position of the tip of the pin) and the lifting device 110
The length of the support column 302 is set such that the upper end surface of the mounting plate 301 is located between the lower end positions of the upper end surfaces of the transport heads 150a and 150b when the lowering is performed. Therefore,
When the lifting / lowering device 110 of the transfer device 100A is descending as shown in FIG. 4, the workpiece W is placed on the left and right placing plates 301 as shown in FIG. Can be moved forward and backward in the workpiece transfer direction without placing the workpiece W. On the other hand, when the lifting / lowering device 110 of the transfer device 100A is raised as shown in FIG. 5, the slide device 120 can move forward and backward while the workpiece W is placed on the transfer heads 150a and 150b. Become.

In the transfer machine of this embodiment, the inspection device 410 is provided on the front surface of the temporary receiving table 300B, and the posture changing device 420 is provided on the front surface of the temporary receiving table 300D. Inspection device 410 is processing station S1
Is a device for inspecting the processing dimensions and the like of the workpiece W processed by the processing station, and inspects the workpiece W placed on the temporary receiving table 300B during the workpiece processing of the processing stations 100A to 100D. ing. Further, the apparatus posture converting device 42 0 to convert the direction and orientation of the workpiece W when the conversion of the direction and attitude the workpiece W to be carried into the processing station S4 from the processing station S3 is required, the processing station 1
During the processing of 00A to 100D, the posture of the workpiece W placed on the temporary receiving table 300D is changed.

Next, the system controller 500 will be described. A system control device 500 including a computer is coupled to the numerical control device NC of each of the processing stations S1 to S4, receives a processing completion signal from the device NC, and controls the transfer operation of each of the transfer devices 100A to 100D. Hereinafter, the transport operation of the transport devices A to D will be described with reference to a model diagram of FIG. In addition, since all the transfer apparatuses 100A to 100D perform the same transfer operation, only the transfer apparatus 100B will be described in the description.

Now, as shown in FIG. 7 (A), the workpiece W which has completed each processing is held at the processing position in the processing stations S1 and S2.
The workpiece W completed in the processing station S1 and transported in the previous transport operation is placed on the temporary receiving table 300B. In addition, the transport device 100B moves the first and second transport heads 150a, 150
It is assumed that the slide member 122 on which the workpiece W is not placed at 0b is positioned substantially at the center of the transfer device 100B. This state described above is hereinafter referred to as an original position.

When the system controller 500 determines from the processing completion signal that the processing at all of the processing stations S1 to S4 has been completed, the system control device 500 determines that all of the transfer devices 100A to 100D have been processed.
At the same time. That is, the transport device 1
00B drives the slide device 120 to move the slide member 122 in the direction opposite to the workpiece transport direction, and to move the first transport head 150a below the workpiece processing position in the processing station S1, and simultaneously perform the second Transfer head 1
50b is moved below the temporary receiving stand 300B (FIG. 7).
[State of [B]). Next, the lifting / lowering device 110 is raised, and the workpiece W in the processing station S1 is placed on the first transport head 150a, and the workpiece W on the temporary receiving table 300B is placed on the second transport head 150b. (Fig. 7 [C]
State). Subsequently, the slide device 120 is driven to move the slide member 122 in the work transfer direction, and the work W placed on the first transfer head 150a is moved above the temporary receiving table 300B. The workpiece W placed on the head 150b is moved above the workpiece processing position of the processing station S2 (the state of FIG. 7D). Further, the first transport head 150
a, the workpiece W placed on the second transfer head 150b is simultaneously placed on the temporary receiving table 300B.
Is transferred to the workpiece processing position of the processing station S2 (the state of FIG. 7E). Finally, the slide device 120 is driven to move the slide member 122 in the direction opposite to the transport direction, and the slide member 122 is returned to the original position to complete one transport operation. Thereafter, the processing station S1
In addition to the start of the processing in steps S4 to S4, the processing size inspection of the inspection device 410 and the posture conversion of the posture conversion device 420 are performed. When the processing of the processing stations S1 to S4 is completed, the above-described transfer operation is performed, and the transfer of the workpiece W is repeated thereafter.

[0025] However, in implementing the transport operation described above, the conveying device 100A~100C and the length of the conveying apparatus 100D in the slide member 122 is different, when all equal the speed of movement of the slide member 122 conveyance device 100
The slide member 122 of C and the slide member 122 of the transfer device 100D may interfere with each other in the processing station S3. For this reason, the slide member 12 of the transfer device 100D
The servo motor 140 is driven so that the moving speed of the transfer device 2 is faster than the moving speed of the slide member 122 of the transfer devices 100A to 100C, and the transfer cycle times of all the transfer devices 100A to 100D are controlled to be equal.

As described above, in the transfer machine of this embodiment, the transfer devices 100A to 100D corresponding to the laying pitches P1 and P2 are independently provided between the processing stations S1 to S4. Stations S1 to S4
There is a large degree of freedom in the arrangement of the devices and the flexibility is good. In addition, since each of the transfer devices 100A to 100D is independently provided between each of the processing stations S1 to S4, the number of the processing stations S1 to S4 is changed, and the flexibility of the processing stations is changed when the processing stations are rearranged. Is good.

In addition, the workpiece W which has been processed in the previous process
Is temporarily placed on the temporary receiving tables 300A to 300D. By providing the temporary receiving tables 300A to 300B with an inspection device for inspecting processing dimensions and the like and a posture conversion device for changing the posture of the workpiece, the processing station S1 is provided. There is an advantage that the inspection of the processing dimensions and the change of the posture can be easily performed in the transfer line without complicating the configuration of S4.

Further, the transfer devices 100A to 100A to 10
OD has a very simple configuration and can be manufactured at low cost. Further, the first transport head 15 provided on the slide member 122
0a and the second transfer head 150b can simultaneously transfer the workpiece W from the processing station in the previous process to the temporary receiving table and transport the workpiece W from the temporary receiving table to the processing station in the subsequent process. There is an effect that transport is possible.

In the transfer machine of the above-described embodiment, in order to prevent interference of the slide member 122, the transfer devices 100A to 100A having different lengths of the slide member 122 are used.
Although the moving speed of the slide member 122 is changed between 00C and the transfer device 100D, when the moving speeds of the slide members 122 of the transfer devices 100A to 100D are all equal, a short time is required until all the slide members reach predetermined positions. Transfer devices 100A to 100 having slide member 122
You may make C wait. For example, FIG.
7B until the slide member 122 of the transfer device 100D reaches the state shown in FIG. 7B. When the transfer device 100D reaches the state shown in FIG. 7B, the following operations are performed at once. May be started.

In the transfer devices 100A to 100D of the transfer machine of the above-described embodiment, the slide member 122 is slid by the rack 123 and the large-diameter gear 141 mechanism as the feeding means. Is not limited to this, and may be a chain mechanism, a belt mechanism, a linear motor mechanism, or the like.
In addition, the transfer machine according to the present embodiment is configured such that the lifting device 110
Is provided, but a work W is provided on a jig unit (not shown) provided on the work tables 350A to 350D in the processing stations S1 to S4 and the temporary receiving stands 300A to 300D.
When a workpiece delivery device such as a clamper or a manipulator for delivering the workpiece to the transport heads 150a and 150b is provided, the elevating device 110 (the workpiece delivery device) does not necessarily need to be provided in the transport devices 100A to 100D.

Further, in this embodiment, the transfer device 100
Although A to 100D and temporary receiving stands 300A to 300D have different configurations, they may be integrated.

[0032]

As described above, in the transfer machine of the present invention, since the transfer device corresponding to the laying pitch of the machine tool is independently provided between the machine tools, the transfer stations of the processing stations S1 to S3 are provided. Great flexibility in installation. In addition, since each transfer device is provided independently between each machine tool, there are effects such as rearrangement of machine tools that change the number of machine tools, and good flexibility when organizing the process of machine tools. is there.

In addition, since the workpiece which has been processed in the previous process is once placed on the temporary receiving table, an inspection device for inspecting processing dimensions and the like and a posture conversion for converting the attitude of the workpiece are provided on the temporary receiving table. An apparatus can be provided, and there is an advantage that processing dimensions can be inspected and the posture can be easily changed in the transfer line. Also, the transfer device in the transfer machine of the present invention supports two workpieces by a first transfer head and a second transfer head provided on a slide member, and transfers a work from a processing position of a machine tool in a previous process to a temporary receiving table. Since the transfer of the work and the transfer of the work from the temporary receiving table to the processing position of the machine tool in the subsequent process can be performed at the same time, there is an effect that the work can be transferred at a high speed. In addition, each transport device is
Conveyance is controlled in the same cycle time regardless of differences
As a result, the slide members of the adjacent transport device may interfere with each other.
Absent.

[Brief description of the drawings]

FIG. 1 is a plan view showing a system arrangement of a transfer machine according to an embodiment of the present invention.

FIG. 2 is a front view of a transfer device used in the transfer machine of the embodiment.

FIG. 3 is an enlarged sectional view of an essential part taken along line AA in FIG. 2;

FIG. 4 is a front view of a temporary receiving stand used in the transfer machine of the embodiment.

FIG. 5 is a front view of a temporary receiving stand used in the transfer machine of the embodiment.

FIG. 6 is a side view of a temporary cradle used in the transfer machine of the embodiment.

FIG. 7 is a model diagram showing a transfer operation of a transfer device used in the transfer machine of the embodiment.

FIG. 8 is an overall configuration diagram showing a conventional transfer machine.

[Explanation of symbols]

 100A to 100D Feeding device 110 Lifting device 111 Cylinder 120 Slide device 121 Frame 122 Slide member 123 Rack 140 Servo motor 141 Large diameter gear 150 First transfer head 150b Second transfer head 300A to 300D Temporary support 301 Mounting member 302 Support column 350A to 350D Work table 500 System controller S1 to S4 Machining station NC Numerical controller W Workpiece

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 37/00-41/08 B23Q ^7/ 00-7/18

Claims (3)

(57) [Claims] 1. A transfer machine for processing a workpiece by dividing a process by a plurality of machine tools, wherein the transfer machine is provided independently between each of the machine tools, and a processing position of a machine tool of a preceding process and a machining position of a subsequent process are provided. A temporary cradle on which a workpiece that has been processed by the machine tool in the preceding process is placed at the center of the machining position of the machine tool, and a plurality of machine tools including machine tools arranged at different laying pitches . A frame provided independently of each other and provided in the middle of the machine tool; and a length of substantially half of the distance between the respective processing positions guided on the frame so as to be able to move forward and backward in the workpiece conveying direction. And a first transfer head provided at a front end of the slide member and supporting the workpiece, and a second transfer head provided at a rear end of the slide member and supporting the workpiece. Transfer device , And a said machine tool machining position and the delivery of the workpiece between the conveying device and the workpiece transfer for transferring the workpiece between the temporary cradle to the conveying device apparatus, wherein the transport apparatus, the slide The state in which the member is located substantially at the center of the transfer device is defined as an original position, and the slide member is moved from the original position in the direction opposite to the workpiece transfer direction by the processing completion signal from the machine tool, thereby setting the first position. The transfer head is positioned below the processing position of the machine tool in the preceding process, and the second transfer head is positioned below the temporary receiving table, and the processing position of the machine tool in the preceding process is determined by the workpiece transfer device. The workpiece in the first
At the same time as placing the workpiece on the transport head, placing the workpiece on the temporary receiving table on the second transport head, and then moving the slide member in the workpiece transport direction to allow the first transport head to receive the temporary workpiece. The second transfer head is positioned above the machine tool in the post-process at the same time as being positioned above the table, and the workpiece placed on the first transport head by the workpiece transfer device is transferred to the temporary receiving table. At the same time as the transfer, the work placed on the second transfer head is transferred to a processing position of the machine tool in the post-process, and the slide member is moved in a direction opposite to the work transfer direction to return to the original position. with repeated transfer cycle consisting operation of returning the previous
Regardless of the distance between the machining positions, the transfer cycle
Transfer machine and controlling conveyance of the cycle time so equal. 2. The transfer machine according to claim 1, wherein the workpiece transfer device including a lifting device is provided in the transfer device. 3. The transfer machine according to claim 1, wherein the workpiece transfer device is provided at a processing position of the machine tool and at the temporary receiving table.